Carnival of Space 110 is up at Kentucky Space.
This site provided a new article about space based solar power, which has a video by Powersat
Centauri dreams adds "Of Technological Lifetimes and Survival" to this week's carnival. Paul Gilster speculates on the survivability of long term digital data storage. The trend of technology is not necessarily always be up - we've experienced 'dark ages' before
Check out Kentucky Space for more Carnival of Space 110.
July 07, 2009
Various Ways to Avoid About One Billion tons of CO2
The Gigaton Throwdown is an initiative to encourage investors, entrepreneurs, business leaders, and policy makers to “think big” to massively scale clean energy during the next 10 years.
The USA avoids 700 million tons of CO2 from the 800 billion kwh of nuclear power that are generated from standard nuclear plants.
1. A program to accelerate the research and development of annular fuel [ultra-uprates] (MIT, Westinghouse) to allow for 50% power increase to existing nuclear reactors with ultra-uprates. (beyond the traditional power uprates of up to 20%. This could be achieved with research budget allocation and policy changes to ensure prompt deployment. Full deployment in the United States would be avoid about 300 million tons of CO2/year. (30% boost to boiler water reactors.) Full deployment worldwide would avoid 1 billion tons of CO2/year.
Annular fuel ultra uprate economics are discussed in this nextbigfuture article
The technical specifics of the MIT research on annular fuel are summarized in this nextbigfuture article
2. The USA needs to adopt the Idaho national lab plan for conventional nuclear reactors.
Speeding the build out of nuclear reactors. China is adding 77GW of new nuclear power from now to 2020. The US can accelerate the buildout of nuclear power plants (currently on track for 4-8 by 2020). Politically possible fast tracking would be about 10 nuclear reactors.
3. Develop factor mass produced deep burn nuclear reactors
The Aim High program to make factory mass produced Liquid fluoride thorium reactors to replace coal power worldwide.
A list of eleven fusion and fission technologies to develop.
In terms of transportation:
4. Deploy electric bikes (free like Amsterdam) and also have electric buses/vans for ensuring that people and the free electric vehicles have optimal logistics
China makes and adds 20-30 million electric bikes and scooters each year. 100 million peddle bike sales worldwide. China has 450 million peddle bike users.
5. X prize program for the retrofitting of existing vehicles for fuel efficiency. Aerodynamic retrofit of existing vehicles can enable 30% reduction in highway driving fuel usage. Need to have prizes for figuring out deployment that makes economic sense that people will adopt.
Aeromodding cars for higher mileage
Researchers have achieved 15 to 18 percent reduction in drag by placing the actuators on the back surface of cars and trucks.
6. there is a computer system that works with cruise control (developed in the UK by Sentience) and GPS which allows for proper computer controlled/assisted acceleration and breaking for 5-24% more fuel efficiency. Basically computer assisted hypermiling.
Policy to force the aerodynamic and engine retrofits of high mileage vehicles likes cabs and other high mile fleet vehicles.
7. Carbon sequestering in cities by using carbon absorbing cement.
8. Previous list of major CO2 mitigation methods.
Biochar sequestering, Regular Carbon Sequestering, CO2 Capture from the Air - for Fuel or Storage
Gigaton Throwdown
The Gigaton Throwdown, a project by Sunil Paul. Mr. Paul started the project under the auspices of the Clinton Global Initiative on Stabilizing the Climate. He organized a fairly large group of venture capital companies, some from the renewable energy sector, and some academic and think tank policy analysts, all concerned about climate change and the need for dramatic action to mitigate such change.
The Gigaton Throwdown defined, briefly:
"The Gigaton Throwdown, launched in 2007 at the Clinton Global Initiative by Sunil Paul, is a project to encourage entrepreneurs, investors and policy makers to plan to grow companies to a scale that they change the climate. The project is evaluating a portfolio of cleantech pathways that could lead to 1 gigaton per year of CO2-equivalent reduction by 2020, and the implications for capital, policy, and industry. The pathways currently in analysis are solar PV, solar thermal, wind, biofuels, nuclear, geothermal, plug-in hybrid electric vehicles, and buildings."
The Gigaton Throwdown report was released June 24, 2009 in Washington DC.
For more background data and analyses behind the final report.
For more background on the Clinton Global Initiative at which the Gigaton Throwdown was launched.
You will note that Dr. John Holdren, Science Advisor to President Obama, was a lead participant in this particular Clinton Global Initiative meeting.
McKinsey consulting had a plan and an analysis of ways to avoid CO2.
1. Energy efficiency in buildings and appliances (710-870 megatons of carbon)
2. More fuel efficient vehicles (340-660 megatons of carbon)
3. Industrial efficiency (620-770 megatons)
4. Bigger carbon sinks (like more forest) (440-580 megatons)
5. Less carbon intensive power generation (800-1570 megatons)
This last one is more nuclear power and renewables and cleaning up coal.
The USA avoids 700 million tons of CO2 from the 800 billion kwh of nuclear power that are generated from standard nuclear plants.
1. A program to accelerate the research and development of annular fuel [ultra-uprates] (MIT, Westinghouse) to allow for 50% power increase to existing nuclear reactors with ultra-uprates. (beyond the traditional power uprates of up to 20%. This could be achieved with research budget allocation and policy changes to ensure prompt deployment. Full deployment in the United States would be avoid about 300 million tons of CO2/year. (30% boost to boiler water reactors.) Full deployment worldwide would avoid 1 billion tons of CO2/year.
Annular fuel ultra uprate economics are discussed in this nextbigfuture article
The technical specifics of the MIT research on annular fuel are summarized in this nextbigfuture article
2. The USA needs to adopt the Idaho national lab plan for conventional nuclear reactors.
Speeding the build out of nuclear reactors. China is adding 77GW of new nuclear power from now to 2020. The US can accelerate the buildout of nuclear power plants (currently on track for 4-8 by 2020). Politically possible fast tracking would be about 10 nuclear reactors.
Stretch Goals:
1. Life extension of the current fleet beyond 60 years (e.g., what would it
take to extend all lives to ~80 years?); and
2. Strong, sustained expansion of ALWRs throughout this century (e.g., what
would it take to proceed uninterrupted from first new plant deployments in
~2015 to sustained build-rates approaching 10+/year?).
Achieving a build rate of 10 plants per year, which on a sustained basis equates to about 50 plants under construction at any point in time, will require substantial investment in workforce training and new or refurbished manufacturing capability.
3. Develop factor mass produced deep burn nuclear reactors
The Aim High program to make factory mass produced Liquid fluoride thorium reactors to replace coal power worldwide.
A list of eleven fusion and fission technologies to develop.
In terms of transportation:
4. Deploy electric bikes (free like Amsterdam) and also have electric buses/vans for ensuring that people and the free electric vehicles have optimal logistics
China makes and adds 20-30 million electric bikes and scooters each year. 100 million peddle bike sales worldwide. China has 450 million peddle bike users.
5. X prize program for the retrofitting of existing vehicles for fuel efficiency. Aerodynamic retrofit of existing vehicles can enable 30% reduction in highway driving fuel usage. Need to have prizes for figuring out deployment that makes economic sense that people will adopt.
Aeromodding cars for higher mileage
Researchers have achieved 15 to 18 percent reduction in drag by placing the actuators on the back surface of cars and trucks.
6. there is a computer system that works with cruise control (developed in the UK by Sentience) and GPS which allows for proper computer controlled/assisted acceleration and breaking for 5-24% more fuel efficiency. Basically computer assisted hypermiling.
Policy to force the aerodynamic and engine retrofits of high mileage vehicles likes cabs and other high mile fleet vehicles.
7. Carbon sequestering in cities by using carbon absorbing cement.
8. Previous list of major CO2 mitigation methods.
Biochar sequestering, Regular Carbon Sequestering, CO2 Capture from the Air - for Fuel or Storage
Gigaton Throwdown
The Gigaton Throwdown, a project by Sunil Paul. Mr. Paul started the project under the auspices of the Clinton Global Initiative on Stabilizing the Climate. He organized a fairly large group of venture capital companies, some from the renewable energy sector, and some academic and think tank policy analysts, all concerned about climate change and the need for dramatic action to mitigate such change.
The Gigaton Throwdown defined, briefly:
"The Gigaton Throwdown, launched in 2007 at the Clinton Global Initiative by Sunil Paul, is a project to encourage entrepreneurs, investors and policy makers to plan to grow companies to a scale that they change the climate. The project is evaluating a portfolio of cleantech pathways that could lead to 1 gigaton per year of CO2-equivalent reduction by 2020, and the implications for capital, policy, and industry. The pathways currently in analysis are solar PV, solar thermal, wind, biofuels, nuclear, geothermal, plug-in hybrid electric vehicles, and buildings."
The Gigaton Throwdown report was released June 24, 2009 in Washington DC.
For more background data and analyses behind the final report.
For more background on the Clinton Global Initiative at which the Gigaton Throwdown was launched.
You will note that Dr. John Holdren, Science Advisor to President Obama, was a lead participant in this particular Clinton Global Initiative meeting.
McKinsey consulting had a plan and an analysis of ways to avoid CO2.
1. Energy efficiency in buildings and appliances (710-870 megatons of carbon)
2. More fuel efficient vehicles (340-660 megatons of carbon)
3. Industrial efficiency (620-770 megatons)
4. Bigger carbon sinks (like more forest) (440-580 megatons)
5. Less carbon intensive power generation (800-1570 megatons)
This last one is more nuclear power and renewables and cleaning up coal.
Singularity University Open to the Public Event: Thursday, July 9, 7-9pm
Singularity University is pleased to invite the public to a panel discussion with leading experts on “Humanity’s Grandest Challenges,” on Thursday, July 9 at 7pm PT. Exponentially accelerating “grand challenges” will take political power, significant investments, and necessitate the development of equally accelerating technologies to affect the large numbers of people required to make a real difference – locally and globally.
Join some of the world’s leading experts in public health, climate change, energy, and others as they discuss the “grand challenges” in water, health, the environment, and energy, and identify some of the technical and political issues associated with making significant progress in finding immediate and long-term sustainable solutions that can positively affect at least one billion people in the next 10 years.
WHO:
Moderator: Mr. Vijay Vaitheeswaran, Writer for The Economist, Author of "Zoom"
Global Public Health: Dr. Larry Brilliant, Skoll Foundation
Climate: Dr. Chris Field, Carnegie/Stanford, U.S. Rep to the International Panel on Climate Change, co-author of the IPCC report that won the Nobel Prize with Al Gore
Water: Ms. Meena Palaniappan, Pacific Institute, Director of their Water Initiative
Climate: Dr. Bill Collins, Head of the Climate Science Department, Lawrence Berkeley National Laboratory.
Thursday, July 9, Singularity University is organizing a top level panel about "Humanity's Grand Challenges" from 7:00 pm to 9:00 pm in its campus at NASA Ames Research Center in Mountain View. This is a public event and you and your friends in Silicon Valley and the Bay Area are very welcome to participate, but please register for the panel here:
http://sugrandchallengesjuly9.eventbrite.com/
“Humanity’s Grand Challenges” is the second in a series of weekly Singularity University presentations open to the public during the course of the 9-week Graduate Summer Program. Visit SU's blog - www.singularityu.org/blog - for upcoming presentations. Following the presentation, videos will be available at: www.singularityu.org/videos.
Directions to the presentation can be found here - http://naccenter.arc.nasa.gov/directions.html#nacc Please note that a valid government issued identification (like a driver's license) is required for access to NASA Ames Research Park.
The first three days of the Singularity University are covered at hplus magazine.
Join some of the world’s leading experts in public health, climate change, energy, and others as they discuss the “grand challenges” in water, health, the environment, and energy, and identify some of the technical and political issues associated with making significant progress in finding immediate and long-term sustainable solutions that can positively affect at least one billion people in the next 10 years.
WHO:
Moderator: Mr. Vijay Vaitheeswaran, Writer for The Economist, Author of "Zoom"
Global Public Health: Dr. Larry Brilliant, Skoll Foundation
Climate: Dr. Chris Field, Carnegie/Stanford, U.S. Rep to the International Panel on Climate Change, co-author of the IPCC report that won the Nobel Prize with Al Gore
Water: Ms. Meena Palaniappan, Pacific Institute, Director of their Water Initiative
Climate: Dr. Bill Collins, Head of the Climate Science Department, Lawrence Berkeley National Laboratory.
Thursday, July 9, Singularity University is organizing a top level panel about "Humanity's Grand Challenges" from 7:00 pm to 9:00 pm in its campus at NASA Ames Research Center in Mountain View. This is a public event and you and your friends in Silicon Valley and the Bay Area are very welcome to participate, but please register for the panel here:
http://sugrandchallengesjuly9.eventbrite.com/
“Humanity’s Grand Challenges” is the second in a series of weekly Singularity University presentations open to the public during the course of the 9-week Graduate Summer Program. Visit SU's blog - www.singularityu.org/blog - for upcoming presentations. Following the presentation, videos will be available at: www.singularityu.org/videos.
Directions to the presentation can be found here - http://naccenter.arc.nasa.gov/directions.html#nacc Please note that a valid government issued identification (like a driver's license) is required for access to NASA Ames Research Park.
The first three days of the Singularity University are covered at hplus magazine.
Earthquake cloak: Adapting Optical Invisibility Techniques for Earthquake Shockwave Resistant Buildings
Correcting article: There are several papers on cloaking buildings from earthquake waves. Thanks to Sebastien Guenneau for providing clarification.
There is a paper by M. Farhat, S. Guenneau and S. Enoch, which has nothing to do with flexural waves. The paper shows that the design works for only 10 rings with 6 different elastic materials.
M. Farhat, S. Enoch, S. Guenneau and A.B. Movchan, Controlling surface waves through artificial transversely isotropic fluid, Physical Review Letters, vol. 101, 1345011, 2008. This research is for protecting against Tsunamis.
There is another paper by M. Brun, S. Guenneau and A.B. Movchan.
This rewritten article was mostly referring to the Brun, Guenneau and Movchan article but had mixed in some references to the Farhat, Guenneau and Enoch article.
Sebastien Guenneau has about 35 research papers from 2007 - 2009.
A New Scientist article discusses what one of the papers. It borrows from the physics of invisibility cloaks could make it possible to hide buildings from the devastating effects of earthquakes.
For a ten meter building, you need a one meter thick foundation with a diameter of 20 meters.
This is something that would only make economic sense for nuclear power plants and high value military or other complexes or if as a society we decided to make key
infrastructure robust. (Like hospitals).
From the American Physical Society and Arxiv a paper by Brun, Guenneau and Movchan. Theoretical work on creating an earthquake cloak (pdf, 9 page)
Achieving control of in-plane elastic waves: Applied Physics Letters
FURTHER READING
Cloaking bending waves propagating in thin elastic plates by Mohamed Farhat, Sebastien Guenneau, Stefan Enoch, and Alexander B. Movchan
There is a paper by M. Farhat, S. Guenneau and S. Enoch, which has nothing to do with flexural waves. The paper shows that the design works for only 10 rings with 6 different elastic materials.
M. Farhat, S. Enoch, S. Guenneau and A.B. Movchan, Controlling surface waves through artificial transversely isotropic fluid, Physical Review Letters, vol. 101, 1345011, 2008. This research is for protecting against Tsunamis.
There is another paper by M. Brun, S. Guenneau and A.B. Movchan.
This rewritten article was mostly referring to the Brun, Guenneau and Movchan article but had mixed in some references to the Farhat, Guenneau and Enoch article.
Sebastien Guenneau has about 35 research papers from 2007 - 2009.
A New Scientist article discusses what one of the papers. It borrows from the physics of invisibility cloaks could make it possible to hide buildings from the devastating effects of earthquakes.
For a ten meter building, you need a one meter thick foundation with a diameter of 20 meters.
This is something that would only make economic sense for nuclear power plants and high value military or other complexes or if as a society we decided to make key
infrastructure robust. (Like hospitals).
From the American Physical Society and Arxiv a paper by Brun, Guenneau and Movchan. Theoretical work on creating an earthquake cloak (pdf, 9 page)
A derivation of the elastic properties of a cylindrical cloak for in-plane coupled shear and pressure waves. The cloak is characterized by a rank 4 elasticity tensor with 16 spatially varying entries which are deduced from a geometric transform.
The seismic waves of an earthquake fall into two main groups: body waves that propagate through the Earth, and surface waves that travel only across the surface.
The research team [Michele Brun, Sebastien Guenneau and Sasha Movchan] have calculated that controlling body waves would be too complex, controlling surface waves is within the ability of conventional engineering, they say. Fortunately, it is surface waves that are more destructive, says team member Sebastien Guenneau at the University of Liverpool in the UK.
The new theoretical cloak comprises a number of large, concentric rings made of plastic fixed to the Earth's surface. The stiffness and elasticity of the rings must be precisely controlled to ensure that any surface waves pass smoothly into the material, rather than reflecting or scattering at the material's surface.
When waves travel through the cloak they are compressed into tiny fluctuations in pressure and density that travel along the fastest path available. By tuning the cloak's properties, that path can be made to be an arc that directs surface waves away from an area inside the cloak. When the waves exit the cloak, they return to their previous, larger size.
Unlike some of the optical invisibility cloaks that have been studied in physics labs in recent years, the new cloak is "broadband", meaning that it can divert waves across a range of frequencies.
Achieving control of in-plane elastic waves: Applied Physics Letters
We derive the elastic properties of a cylindrical cloak for in-plane coupled shear and pressure waves. The cloak is characterized by a rank 4 elasticity tensor with spatially varying entries, which are deduced from a geometric transform. Remarkably, the Navier equations retain their form under this transform, which is generally untrue [G. W. Milton et al., N. J. Phys. 8, 248 (2006)]. The validity of our approach is confirmed by comparison of the analytic Green's function in homogeneous isotropic elastic space against full-wave finite element computations in a heterogeneous anisotropic elastic region surrounded by perfectly matched layers
FURTHER READING
Cloaking bending waves propagating in thin elastic plates by Mohamed Farhat, Sebastien Guenneau, Stefan Enoch, and Alexander B. Movchan
We introduce a cylindrical cloak to control the bending waves propagating in thin plates. This is achieved through radially dependent isotropic mass density and radially dependent and orthotropic flexural rigidity deduced from a coordinate transformation for the biharmonic propagation equation in the spirit of the paper of Pendry et al. [Science 312, 1780 (2006)]. We analyze the response of the cloak surrounding a clamped obstacle in the presence of a cylindrical excitation. We note that whereas the studied bending waves are of different physical and mathematical nature, they are cloaked in many ways as their electromagnetic and acoustic counterparts; e.g., when the source lies inside the coating, it seems to radiate from a shifted location (mirage effect).
July 06, 2009
DARPA working on Chip-Scale High Energy Atomic Beams and 19 Other Top Projects
1. From Wired, DARPA working on Chip-Scale High Energy Atomic Beams
NOTE: there does not seem to be follow up funding in 2010. However, the 2009 funded work is probably not finished yet. It is not clear what is the result of the work.
The 50 page PDF of DARPA spending plans has some other interesting projects in the 2009 budget and the 471 page pdf 2010 budget.
2. The Low Power Micro Cryogenic Coolers program will attain superior performance in micro-scale devices (e.g. Low Noise Amplifier (LNA’s) IR detectors, RF front-ends, superconducting circuits) by cooling selected portions to cryogenic temperatures. The key approach in this program that should allow orders of magnitude power savings is to selectively cool only the needed volume/device via MEMS-enabled isolation technologies. Such an approach will benefit a large number of applications where performance is determined predominately by only a few devices in a system, e.g., communications where the front-end filter and LNA often set the noise figure; and sensors, where the transducer and input transistor in the sense amplifier often set the resolution. MEMS technology will also be instrumental for achieving micro-scale mechanical pumps, valves, heat exchangers, and compressors, all needed to realize a complete cryogenic refrigeration system on a chip. Transition of this technology is anticipated through industry, who will incorporate elements of the technology in current and future weapon system designs.
Program Plans:
FY 2007 Accomplishments:
− Demonstrated thermal isolation of >10,000 kilowatt (K/W) in a silicon micromachining process.
− Demonstrated on-chip cooling to 77 kelvin (K) using a photonic fiber heat exchanger.
− Demonstrated new localized on-chip cooler approaches using integrated thermoelectric coolers and photonic heat exchangers.
FY 2008 Plans:
− Demonstrate micro-scale coolers capable of providing the needed cryogenic temperature while still fitting into a miniature size, with
sufficient efficiency for low power operation.
− Demonstrate heat exchangers, Joule-Thompson plugs, valves, pumps, all needed for cryo-cooler implementation.
FY 2009 Plans:
− Integrate micro cooler components together with sufficiently isolated devices to-be-cooled to yield a single chip system consuming very little power.
3. Microsystem Integrated Navigation Technology
The Microsystem Integrated Navigation Technology (MINT) program is developing technology for precision inertial navigation coupled with micro navigation aiding sensors. The MINT program will develop universally reconfigurable microsensors (e.g., for magnetic fields, temperature, pressure) with unmatched resolution and sensitivity. These devices will use the latest in MEMS and photonic technologies to harness perturbations in atomic transitions as the sensing and measuring mechanisms for various parameters. Program transition will occur through industrial performers into future DoD platforms.
(U) Program Plans:
FY 2007 Accomplishments:
− Developed a tunable microwave local oscillator to excite and select different hyperfine transitions.
FY 2008 Plans:
− Develop technology to dramatically reduce bias drifts in Complementary Metal-Oxide Semiconductor (CMOS)-integrated MEMS
accelerometers and gyros.
− Develop CMOS-MEMS sensors for precision navigation aids such as velocity ranging and zero-velocity updating.
FY 2009 Plans:
− Reduce power and volume requirements.
− Develop technologies to harvest power through energy scavenging.
4. Nano-Electro-Mechanical Computers (NEMS)
The goal of the Nano-Electro-Mechanical Computers (NEMS) program is to develop nanoscale mechanical switches and gain elements integrated intimately with complementary metal-oxide semiconductor switches. One mechanical switch per transistor will enable the transistor to operate at near zero leakage powers, enabling pico or femtowatt standby operation. The program will also develop mechanical gain elements using physical effects such as giant magnetoresistance, buckling, electromechanical phase transitions, van der Waals forces, and Casimir forces to enable very low-noise, high-frequency amplifiers for low-power, low-noise analog signal processing. Possibilities of using mechanical power supplies and mechanical vibrating clocks could enable electronics that are less susceptible to electromagnetic pulse attacks. Enabling of nanomechanical elements in direct bandgap materials will circumvent problems of gate oxide stability, allowing fast logic with optics functionality. This program will transition into DoD systems via industrial program performers.
Program Plans:
FY 2007 Accomplishments:
− Developed nanomechanical switch-based logic in semiconductors, metals and insulators.
FY 2008 Plans:
− Develop mechanical gain elements for analog amplification using effects such as buckling and electromechnical phase changes.
FY 2009 Plans:
− Develop NEMS switches in direct bandgap materials to enable optical functionality with switches.
FY 2010 Plans:
- Demonstrate NEMS devices and technologies for microcontroller building blocks - adders, counters, memories, that can operate at very high temperatures.
5. Chip Scale Autopilot for UAVs
The Chip-Scale Auto Pilot program will develop a new chip-scale subsystem for unmanned aerial vehicles (UAVs), which will provide on-board autonomous capabilities for collision avoidance and maneuvering support. The system will use data from miniature inertial sensors, imagers, and other sensors, and a data-fusion algorithm to produce control signals for the facilities on an existing UAV, such as the Wireless Application Service Provider (WASP). The goal is to allow operators of UAVs in dense urban environments to focus on high-level objectives, and to leave responsibility for survival and maneuvering to the UAV.
(U) Program Plans:
FY 2009 Plans:
− Develop mm-scale navigation system merging signals from Inertial Measurement Unit (IMU), Vision, GPS, and Timing.
− Fuse data from complimentary systems for on-board, autonomous collision avoidance and basic navigation functions
6. Microtechnologies for Air-Cooled Exchangers
The Microtechnologies for Air-Cooled Exchangers (MACE) Heat Sink Enhancement program will explore emerging concepts for enhancement of the performance of heat rejection systems throughout the DoD. Specific program goals include the reduction of the thermal resistance by a factor of 4x and reducing the power consumption of the cooling system by 3x. Successful projects will apply MACE technologies to a customer-specified application.
FY 2009 Plans:
− Demonstrate models, measurements, and Single-Fin device.
− Establish functional full-scale heat sink 4”x4”x1” with 4x reduction in thermal resistance and 3x improvement in coefficient of performance.
FY 2010 Plans:
- Fabricate and test a ‘single-fin’ heat sink device.
- Scale up prototype air-cooled exchangers to a large, full-format heat sink.
7. Maskless Direct-Write Nanolithography for Defense Applications
The Maskless Direct-Write Nanolithography for Defense Applications program will develop a maskless, direct-write lithography tool that will address both the DoD’s need for affordable, high performance, low volume Integrated Circuits (ICs) and the commercial market’s need for highly customized, application-specific ICs. In addition, this program will provide a cost effective manufacturing technology for low volume nanoelectromechanical systems (NEMS) and nanophotonics initiatives within the DoD. Transition will be achieved by maskless lithography tools, installed in the Trusted Foundry and in commercial foundries, which will enable incorporation of state-of-the-art semiconductor devices in new military systems, and allow for the cost-effective upgrade of legacy military systems.
Program Plans:
FY 2007 Accomplishments:
− Completed and delivered End-to-End System Error Budget and throughput model.
FY 2008 Plans:
− Design, build and integrate a demagnification optics system and wafer adapter, and achieve a patterning resolution on the wafer of
about 1 micron.
− Characterize prototype Reflection Electron Branch Lithography (REBL) system to validate simulation results.
FY 2009 Plans:
− Demonstrate rotary stage at 10 meters per second.
− Demonstrate static imaging on prototype REBL system.
− Demonstrate dynamic imaging on prototype REBL system.
FY 2010 Plans:
- Demonstrate System Level Lithography Performance on a Linear Stage Demonstrator System.
- Design, build, and test a rotary stage.
- Integrate electron beam column and rotary stage demonstrator platform.
- Design, build, and characterize an enhanced electron beam column for system alpha prototype experiments.
8. Disruptive Manufacturing Technologies
The goal of the Disruptive Manufacturing Technologies (DMT) program is to achieve significant and pervasive cost savings, and/or decreases in cycle time, for existing or planned procurements. There has been a long-standing desire to replace traveling wave tube amplifiers (TWTAs), which are pervasive in nearly all electronic warfare (EW), information warfare (IW), radar, and communication systems, with lower cost solid-state components. The DMT program will merge Polystrata™ and GaN technologies to eliminate the need for monolithic microwave integrated circuits (MMICs). The direct product replacement transition candidate for this program is the TWT power amplifier output stage in the AN/ALE-55, Fiber Optic Towed Decoy for the Navy’s new F/A-18 E/F Super Hornet, and the Air Force B1-B and F-15 platforms. It will be replaced with solid-state hybrid microwave integrate circuit (HyMIC) modules developed by merging Polystrata™ and gallium nitride (GaN) technologies. The result will be a 10x reduction in TWTA cost, equaling >$150M for the Integrated Defensive Electronic Countermeasures (IDECM) program, a joint Navy-Air Force program. Beyond developing a replacement for TWTAs, HyMIC technology promises to increase adoption of high performance MMW systems employing mature III-V technologies as well as advance earlier adoption of those using nascent III-V technologies.
FY 2007 Accomplishments:
− Demonstrated integration of GaN transistors and passive elements with Polystrata™ waveguides.
FY 2008 Plans:
− Demonstrate flip chip mounting on Polystrata™ structures.
− Complete proof-of-concept GaN 20 watts module implemented with Polystrata™ technology, along with a passive element library to enable development of the 57 W GaN building block.
FY 2009 Plans:
− Demonstrate a form-fit-function 160 W GaN amplifier ready for insertion into the IDECM decoy module.
FY 2010 Plans:
- Demonstrate 57 W GaN HyMIC building block.
9. Tip-Based Nanofabrication (TBN)
The Tip-Based Nanofabrication (TBN) program will develop the capability to use Atomic Force Microscope (AFM) cantilevers and tips to controllably manufacture nano-scale structures such as nanowires, nanotubes, and quantum dots for selected defense applications such as optical and biological sensors, diode lasers, light emitting diodes, infrared sensors, high-density interconnects, and quantum computing.
FY 2008 Accomplishments:
- Selected initial fabrication materials, mechanisms, and processes for optimal properties.
- Completed preliminary design of specialized processing equipment.
FY 2009 Plans:
- Demonstrate nanofabrication process using a single-tip structure and associated tooling.
FY 2010 Plans:
- Fabricate a multi-tip array (5 tips) for parallel manufacturing.
- Demonstrate a repeatable tip-based process and manufacturing capability.
10. Programmable Matter
The Programmable Matter program will develop a new functional form of matter, constructed from mesoscale particles that assemble into complex 3-Dimensional (3-D) objects upon external command. These objects will exhibit all of the functionality of their conventional counterparts and ultimately have the ability to reverse back to the original components.
FY 2009 Plans:
- Build a mathematical model that theoretically confirms a viable procedure for constructing macroscopic
3-D solid objects with functional properties that have real world use.
- Demonstrate externally-directed assembly of distinct macroscopic 3-D solids.
- Demonstrate interlocking/adhesion of mesoscale particles to create bulk matter.
- Demonstrate reversibility.
FY 2010 Plans:
- Optimize Programmable Matter properties.
- Demonstrate Programmable Matter for selected applications.
A previous Nextbigfuture article on DARPA's programmable matter project with pictures.
11. Quantum OptoMechanics Integrated on a Chip
The objective of this program is to leverage advances in Photonics and Micro fabrication to develop integrated chips capable of exploiting quantum optomechanical applications. Although light is usually thought of as carrying energy but relatively little momentum, light confined to a high-finesse cavity can exert significant force on the cavity mirrors. When the mirror is allowed to vibrate by coupling it to a
mechanical (spring-like) system, energy can be transferred between coupled optomechanical resonators. Depending on the detuning of the cavity, one can obtain either damping (cooling) or amplification (heating) of the mirror motion. Notable achievements in this field are the demonstration of mirror cooling (damping of the internal degree of motion) to sub-Kelvin (6 mK) temperatures and demonstration of radiation driven high-Q, high-frequency (1 GHz) oscillators. With sufficiently high cavity finesse and Q’s of the mechanical system, it is possible to reach a regime in which the mirror motion is no longer thermally limited. Instead, it becomes limited by the quantum mechanical radiation pressure force. Once this limit is reached, it
is possible to take advantage of quantum mechanical effects without having to cool the system. It is anticipated this will result in a new generation of mass-sensing devices and ultra high-Q, high-frequency resonators controlled by light. In optical systems, it will be possible to efficiently squeeze light beyond the standard shot-noise limit producing light sources for infrared detection and quantum information
applications.
FY 2010 Plans:
- Demonstrate resonant frequency of 10 megahertz (MHz).
- Demonstrate Mechanical Q of 1x10^6.
12. Nanoscale/Biomolecular and MetaMaterials
The research in this thrust area exploits advances in nanoscale and bio-molecular materials, including computationally based materials science, in order to develop unique microstructures and material properties. This area also includes efforts to develop the underlying physics for the behavior of materials whose properties have been engineered at the nanoscale level (metamaterials) and materials exhibiting a permanent electric charge (charged matter).
FY 2008 Accomplishments:
- Developed efficient computational methods that correctly predict the properties of excited electronic states in high intensity laser.
- Achieved mid-wave infrared optical transmission comparable to that of spinel and worked toward achieving a composite material with mechanical properties comparable to those of sapphire in yttriamagnesia nanocomposite material.
- Achieved first-ever optical model for nanomaterials of interest and transitioned it to the research community.
- Achieved yttria, nano silicon carbide optical ceramics with required strength of sapphire and worked toward optical properties of spinel.
FY 2009 Plans:
- Demonstrate automated laser beam front diagnostic and adaptive beam correction.
- Demonstrate simultaneously infrared optical transmission comparable to spinel and mechanical properties comparable to sapphire in 75mm discs.
- Develop new materials with both optical properties and strength into 75mm flat discs.
- Characterize the material properties of 75mm discs through testing in relevant environments.
- Demonstrate the ability to provide surface strengthening through compressive materials.
- Investigate new methods of altering diatom structures and adapting diatom materials to facilitate new sensors and devices.
FY 2010 Plans:
- Initiate development of new materials into hemispherical domes with decreased optical scatter, doubled mechanical strength, and doubled thermal shock capabilities over single crystal sapphire.
- Characterize the material properties of hemispherical domes through testing in relevant military environments.
- Characterize the material properties of non-hemispherical domes.
- Develop inexpensive processing techniques to create customized diatom derived sensors and devices.
- Ion: demonstrate ability to affect airflow around the surface of an airfoil using ions accelerated across multiple points to generate an airstream on the surface of the airfoil.
- Radiometer: demonstrate ability to produce significant forces on aerofoil-shaped surfaces.
- Establish the material science of charged matter by developing underlying technology and defining range of applicability.
- Demonstrate in a laboratory environment charged matter properties including superadhesion, frictionless surfaces, and resistance to electrostatic charging.
12. Atomic Scale Materials and Devices
This thrust examines the fundamental physics of materials at the atomic scale in order to develop new devices and capabilities. A major emphasis of this thrust is to provide the theoretical and experimental underpinnings of a new class of semiconductor electronics based on spin degree of freedom of the electron, in addition to (or in place of) the charge. A new all optical switch capability will also be investigated. It includes a new, non-invasive method to directly hyperpolarize biological tissues, leading to novel quantitative neurodiagnostics. In addition, this thrust will examine other novel classes of materials and phenomena such as plasmons or Bose-Einstein Condensates (BEC) that have the potential to provide new capabilities in the quantum regime, for example, GPS-independent navigation via atom interferometry as well as the potential to generate significant heat from deuterated palladium.
FY 2010 Plans:
- Develop cooling and precision thermometry techniques for fermionic atoms in optical lattice.
- Develop quantum gas microscope with sufficient resolution to image individual atomic sites in 2-D optical lattice; verify by imaging atomic gas trapped in lattice.
- Emulate XXZ quantum spin model using ion crystal array in less than twelve hours that confirms theoretical calculations.
- Develop the core materials fabrication techniques that will enable extremely low-power, extremely high density, all-oxide, transistor-like switches with a ferroelectric gate and a high density, 2-D interfacial oxide electron gas exhibiting metal-insulator transition in response to an applied gate voltage.
- Model how these transistor-like devices will support corresponding device architecture for advanced reconfigurable logic and memory.
- Design broadband, frequency comb spectroscopy system with sensitivity better than ten parts per billion acetylene at 1.5 microns.
- Evaluate performance improvements from, and system configuration changes needed to, shift comb central wavelength from 1.5 microns to 3 microns.
- Quantify the effects of impurities in palladium substrate material on the capability to generate excess heat. composition and microstructure required to achieve high levels of deuterium loading and tolerate the high stresses associated with these conditions.
- Establish the effects of surface area and crystal orientation on degree of deuterium loading and the loading/relaxation dynamics and correlate these effects with increases in excess heat generated.
- Demonstrate all-optical switch (or equivalent device) based on optically-induced absorption.
- Demonstrate total energy dissipation for an optical switch (or equivalent device) of less than 1 femtojoules per operation, and signal loss of less than 0.1 dB, excluding waveguide losses before and after device.
- Demonstrate soft X-rays with specific states of orbital angular momentum.
- Initiate a series of experiments using the High Frequency Active Auroral Research Program (HAARP) facility to study ionospheric and trans-ionospheric phenomena, including optimization of high frequency to very low frequency conversion efficiency, generation and propagation and characterization
13. Casimir Effect Enhancement (CEE)
This program’s goal is to manipulate materials properties and geometries in order to enable repulsive Casimir forces at interfaces. This can lead to increased reliability in Micro Electrical Mechanical Systems (MEMS) devices by eliminating stiction, reduced drag and increased fuel efficiency in all military systems (boats, airplanes, etc.), or enhancing any system where attractive forces hinder overall performance.
FY 2010 Plans:
- Model potential systems where Casimir forces can be manipulated.
- Experiment to confirm ability to reduce Casimir force.
- Demonstrate nanomechanical device with observable, repeatable ten percent reduction in adhesive forces.
14. Rocket Propelled Grenade (RPG) Nets
The goal of the Rocket Propelled Grenade (RPG) Nets program is to develop a near-term counter RPG net system that has performance at least equivalent to bar or slat armor but that is lighter and easier to deploy; and a mid-term net-based system with active elements that has greatly improved performance. Development of these systems will be supported by modeling to enhance understanding of the net interactions and with extensive live fire testing against RPGs. Successful candidates will be installed on vehicles for evaluation in an operational context.
FY 2010 Plans:
- Begin user evaluation of active net system.
15. High Energy Liquid Laser Area Defense System (HELLADS)
The goal of the High Energy Liquid Laser Area Defense System (HELLADS) program is to develop a high-energy laser weapon system (150 kW) with an order of magnitude reduction in weight compared to existing laser systems. With a weight goal of <5 kg/kW, HELLADS will enable high-energy lasers (HELs) to be integrated onto tactical aircraft and will significantly increase engagement ranges compared to ground-based systems. The HELLADS program has completed the design and demonstration of a revolutionary prototype unit cell laser module that has demonstrated power output and optical wavefront performance that supports the goal of a lightweight and compact 150 kW high energy laser weapon system with near-diffraction limited beam quality. An objective unit cell laser module with integrated power and thermal management is being designed and fabricated by two competing laser suppliers and will demonstrate an output power of >34 kW. Based on the results of the unit cell demonstration, additional laser modules will be fabricated to produce a 150 kW laser that will be demonstrated in a laboratory environment. The 150 kW laser will then be integrated with beam control, power, heat exchange, safety, and command and control subsystems that are based upon existing technologies to produce a laser weapon system demonstrator. The capability to shoot down tactical targets such as surface-to-air missiles and rockets and the capability to perform ultra-precise offensive engagements will be demonstrated in a realistic ground test environment. The HELLADS laser will then be transitioned to the Air Force for aircraft integration and flight testing.
FY 2010 Plans:
- Initiate fabrication of additional unit cell laser modules to complete the 150 kW laser.
- Complete the fabrication and laboratory testing of the 150 kW laser.
- Complete fabrication of the demonstrator laser weapon system.
- Complete demonstrator laser weapon system component and subsystem testing.
- Initiate integration of the 150 kW laser with the laser weapon system.
16. Revolution in Fiber Lasers (RIFL)
The goal of the Revolution in Fiber Lasers (RIFL) program is to develop multi-kilowatt, singlemode, narrow line fiber laser amplifiers using efficient, high brightness laser diode pump arrays. These narrowline fiber laser amplifiers can then be coherently combined to develop ultra-high power electronically steerable optical phased arrays. In Phase 1 of this program, a 1 kW narrowline, single mode, single
polarization fiber laser amplifier will be developed with 15% electrical efficiency and a beam quality of better than 1.4x diffraction limited. In Phase 2 of this program, a 3 kW narrowline, single mode, single polarization fiber laser amplifier will be developed with 30% overall electrical efficiency and better than 1.4x diffraction limited beam quality. Coherent arrays of these high power fiber laser amplifiers will then be developed as part of the DARPA Adaptive Photonic Phase-Locked Elements (APPLE) program (PE0603739E, Project MT-15) to achieve the requisite power and coherence for future multi-kilowatt high power laser weapons.
FY 2008 Accomplishments:
- Performed final engineering designs of a 1 kW coherently combinable fiber amplifier (single mode, single polarization, narrow line) that will support development of a high power fiber laser optical phased array and that will provide >15% electrical efficiency and near-diffraction-limited beam quality (M2 < 1.4).
FY 2009 Plans:
- Initiate construction of 1 kW coherently combinable fiber amplifiers (single mode, single polarization, narrow line) that will support development of a high power fiber laser optical phased array and that will provide >15% electrical efficiency and near-diffraction-limited beam quality (M2 < 1.4).
- Complete final engineering design of a 3kW, 30% efficient, near-diffraction-limited coherently combinable fiber laser amplifier (single mode, single polarization, narrow line) that will support development of high power fiber laser optical phased arrays for laser weapon applications.
FY 2010 Plans:
- Demonstrate and test 15% efficient, single mode, single polarization, coherently combinable fiber laser amplifiers with near diffraction-limited beam quality at 1kW power level.
17. Maintaining Combat Performance
The Maintaining Combat Performance thrust utilizes breakthroughs in biology and physiology to sustain the peak physical and cognitive performance of warfighters operating in extreme conditions. Today, warfighters must accomplish their missions despite extraordinary physiologic stress. Examples of these stressors include extremes of temperature (-20 degrees F to 125 degrees F), oxygen deficiency in mountains, personal loads in excess of 100 lbs, dehydration, psychological stress, and even performance of life-sustaining maneuvers following combat injury. Not only must troops maintain optimum physical performance, but also peak cognitive performance, which includes the entire spectrum from personal navigation and target recognition, to complex command and control decisions, and intelligence synthesis. The Maintaining Combat Performance thrust leverages breakthroughs in diverse scientific fields in order to mitigate the effects of harsh combat environments. For example, understanding the natural mechanisms for core body temperature regulation in hibernating mammals has led to a novel, practical approach for soldier cooling, which is now being evaluated by troops in the far forward combat areas. Other examples include fundamental research elucidating the biological mechanisms of adaptation to extreme altitude, the molecular correlates of muscle fatigue and psychological stress, and natural resistance to disease through dietary nutrients.
FY 2008 Accomplishments:
- Identified genetic indicators of acute mountain sickness and developed approaches to improve cardiopulmonary function at high altitude.
- Demonstrated greater than forty percent improvement from preconditioning prior to high altitude exposure in murine model.
FY 2009 Plans:
- Identify mechanisms to alleviate high altitude illness.
- Investigate mechanisms to speed natural acclimatization at high altitudes.
- Demonstrate the following in-vitro: mechanisms to increase pulmonary blood flow; methods to increase number of red blood cells; and mechanisms to increase oxygen delivery to muscles.
- Position product for use in an FDA Phase I clinical trial by the end of first program phase.
FY 2010 Plans:
- Increase speed acclimatization by providing high altitude cues prior to ascent.
- Identify physical adaptation strategies of altitude-adapted people.
- Demonstrate high altitude illness prevention in mammals using adaptation strategies of altitude-adapted people.
18. Systems of Neuromorphic Adaptive Plastic Scalable Electronics (SyNAPSE)
The Systems of Neuromorphic Adaptive Plastic Scalable Electronics (SyNAPSE) program will develop a brain inspired electronic “chip” that mimics the function, capacity, size, and power consumption of a biological cortex. If successful, the program will provide the foundations for functional machines to supplement humans in many of the most demanding situations faced by warfighters today. In particular, the objective of the program is to process video images for information abstraction (e.g. annotation) and task initiation. The two main technical challenges to achieving this vision are developing an artificial electronic synapse and developing a neural algorithm-architecture that exploits these synapses.
FY 2010 Plans:
- Develop a brain-inspired neuromorphic architectural design and specification capability.
- Develop software tools to translate neuromorphic designs into electronic implementations using hybrid CMOS and high-density electronic synapse components.
- Develop capability to simulate the performance of neuromorphic electronics systems using very large scale computation.
- Develop virtual reality environments intended for training and evaluating electronic neuromorphic systems and their corresponding computer simulations.
- Develop standard testing protocols for assessing the performance of large neuromorphic electronic systems.
19. Vulcan
The goal of the Vulcan demonstration program, previously funded from PE 0602702E, Project TT-07 (HiSTED Program), is to design, build and ground test an engine capable of accelerating a full scale hypersonic vehicle from rest to Mach 4+. Constant Volume Combustion (CVC) engines have been under development for more than a decade. Considerable progress has been made and the technology is believed mature enough to enable a dramatic new propulsion system capability. CVC engines, when combined with turbine engines, offer the ability to design a new class of Mach 4+ air breathing engines. The Vulcan engine will consist of a CVC engine, a full-scale turbine engine, an inlet and a nozzle. CVC engine architectures could include Pulsed Detonation Engines (PDE’s), Continuous Detonation Engines (CDE’s) or other unsteady CVC engine architectures. The CVC engine would operate from below the upper Mach limit of the turbine engine to Mach 4+. The turbine engine will be a current production engine capable of operating above Mach 2. Key objectives of the program are to integrate the turbine engine into the Vulcan engine with minimal modification to the turbine engine; to operate the turbine engine from rest to its upper Mach limit; and to cocoon the turbine engine when it is not in use. The Vulcan engine will enable full-scale hypersonic cruise vehicles for Intelligence, Surveillance and Reconnaissance (ISR), strike or other critical national missions.
FY 2010 Plans:
- Complete designs and simulations of critical components.
- Conduct risk reduction demonstrations of the combustor rig, fuel system, material rig, valve rig, initiator rig, seal rig, inlet rig, nozzle rig, and thermal management system rig components.
- Complete CVC engine preliminary design review.
- Initiate detailed design of subsystems.
20. Ultradense Nanophotonic Intrachip Communication (UNIC)
The goal of the Ultradense Nanophotonic Intrachip Communication (UNIC) program is to demonstrate nanophotonic technology for access to on-chip ultra-dense systems and Input/Output (I/O) to/from a chip containing such ultra-dense systems. Technical challenges that must be met include: high precision, low loss nanophotonic circuit fabrication; low cost fabrication methods; high performance nanoscale modulators; detectors, multiplexers and demultiplexers; architecture for addressing ultra-dense systems; and techniques for efficient high capacity/bandwidth I/O of data to and from the chip. This technology will transition via industrial performers developing faster and more complex processing such as real-time pattern matching, target recognition, image processing and Terahertz (THz) class command-and-control networks.
FY 2010 Plans:
- Demonstrate integrated arrays of 4-wavelength silicon photonic transmitters and receivers operating at 10 gigabytes per second (Gbps).
- Demonstrate feasibility of 1.5 per Joule/bit interconnect link energy budget for silicon photonic optical data link, based upon fabricated arrays.
- Demonstrate wavelength division multiplexed routing through 2 physical layers at 10 Gbps and less than one part in a trillion bit error rate (1E-12 bit error rate).
Chip-scale integration offers precise, micro actuators and high electric field generation at modest power levels that will enable several order of magnitude decreases in the volume needed to accelerate the ions. Furthermore, thermal isolation techniques will enable high efficiency beam to power converters, perhaps making chipscale self-sustained fusion possible.
The Chip-Scale High Energy Atomic Beams project had a budget of just $3 million, and rather shorter timescales; the plans for fiscal year 2009 include: “Develop 0.5 MeV [mega electron-volt] proton beams and collide onto microscale B-11 target with a fusion Q (energy ratio) > 20, possibly leading to self-sustained fusion.” The energy ratio is the amount of power you get out compared to how much you put in. ITER has a design Q of 10, producing its output with a fifty megawatt input. The Darpa scheme would be twice as efficient.
NOTE: there does not seem to be follow up funding in 2010. However, the 2009 funded work is probably not finished yet. It is not clear what is the result of the work.
The 50 page PDF of DARPA spending plans has some other interesting projects in the 2009 budget and the 471 page pdf 2010 budget.
2. The Low Power Micro Cryogenic Coolers program will attain superior performance in micro-scale devices (e.g. Low Noise Amplifier (LNA’s) IR detectors, RF front-ends, superconducting circuits) by cooling selected portions to cryogenic temperatures. The key approach in this program that should allow orders of magnitude power savings is to selectively cool only the needed volume/device via MEMS-enabled isolation technologies. Such an approach will benefit a large number of applications where performance is determined predominately by only a few devices in a system, e.g., communications where the front-end filter and LNA often set the noise figure; and sensors, where the transducer and input transistor in the sense amplifier often set the resolution. MEMS technology will also be instrumental for achieving micro-scale mechanical pumps, valves, heat exchangers, and compressors, all needed to realize a complete cryogenic refrigeration system on a chip. Transition of this technology is anticipated through industry, who will incorporate elements of the technology in current and future weapon system designs.
Program Plans:
FY 2007 Accomplishments:
− Demonstrated thermal isolation of >10,000 kilowatt (K/W) in a silicon micromachining process.
− Demonstrated on-chip cooling to 77 kelvin (K) using a photonic fiber heat exchanger.
− Demonstrated new localized on-chip cooler approaches using integrated thermoelectric coolers and photonic heat exchangers.
FY 2008 Plans:
− Demonstrate micro-scale coolers capable of providing the needed cryogenic temperature while still fitting into a miniature size, with
sufficient efficiency for low power operation.
− Demonstrate heat exchangers, Joule-Thompson plugs, valves, pumps, all needed for cryo-cooler implementation.
FY 2009 Plans:
− Integrate micro cooler components together with sufficiently isolated devices to-be-cooled to yield a single chip system consuming very little power.
3. Microsystem Integrated Navigation Technology
The Microsystem Integrated Navigation Technology (MINT) program is developing technology for precision inertial navigation coupled with micro navigation aiding sensors. The MINT program will develop universally reconfigurable microsensors (e.g., for magnetic fields, temperature, pressure) with unmatched resolution and sensitivity. These devices will use the latest in MEMS and photonic technologies to harness perturbations in atomic transitions as the sensing and measuring mechanisms for various parameters. Program transition will occur through industrial performers into future DoD platforms.
(U) Program Plans:
FY 2007 Accomplishments:
− Developed a tunable microwave local oscillator to excite and select different hyperfine transitions.
FY 2008 Plans:
− Develop technology to dramatically reduce bias drifts in Complementary Metal-Oxide Semiconductor (CMOS)-integrated MEMS
accelerometers and gyros.
− Develop CMOS-MEMS sensors for precision navigation aids such as velocity ranging and zero-velocity updating.
FY 2009 Plans:
− Reduce power and volume requirements.
− Develop technologies to harvest power through energy scavenging.
4. Nano-Electro-Mechanical Computers (NEMS)
The goal of the Nano-Electro-Mechanical Computers (NEMS) program is to develop nanoscale mechanical switches and gain elements integrated intimately with complementary metal-oxide semiconductor switches. One mechanical switch per transistor will enable the transistor to operate at near zero leakage powers, enabling pico or femtowatt standby operation. The program will also develop mechanical gain elements using physical effects such as giant magnetoresistance, buckling, electromechanical phase transitions, van der Waals forces, and Casimir forces to enable very low-noise, high-frequency amplifiers for low-power, low-noise analog signal processing. Possibilities of using mechanical power supplies and mechanical vibrating clocks could enable electronics that are less susceptible to electromagnetic pulse attacks. Enabling of nanomechanical elements in direct bandgap materials will circumvent problems of gate oxide stability, allowing fast logic with optics functionality. This program will transition into DoD systems via industrial program performers.
Program Plans:
FY 2007 Accomplishments:
− Developed nanomechanical switch-based logic in semiconductors, metals and insulators.
FY 2008 Plans:
− Develop mechanical gain elements for analog amplification using effects such as buckling and electromechnical phase changes.
FY 2009 Plans:
− Develop NEMS switches in direct bandgap materials to enable optical functionality with switches.
FY 2010 Plans:
- Demonstrate NEMS devices and technologies for microcontroller building blocks - adders, counters, memories, that can operate at very high temperatures.
5. Chip Scale Autopilot for UAVs
The Chip-Scale Auto Pilot program will develop a new chip-scale subsystem for unmanned aerial vehicles (UAVs), which will provide on-board autonomous capabilities for collision avoidance and maneuvering support. The system will use data from miniature inertial sensors, imagers, and other sensors, and a data-fusion algorithm to produce control signals for the facilities on an existing UAV, such as the Wireless Application Service Provider (WASP). The goal is to allow operators of UAVs in dense urban environments to focus on high-level objectives, and to leave responsibility for survival and maneuvering to the UAV.
(U) Program Plans:
FY 2009 Plans:
− Develop mm-scale navigation system merging signals from Inertial Measurement Unit (IMU), Vision, GPS, and Timing.
− Fuse data from complimentary systems for on-board, autonomous collision avoidance and basic navigation functions
6. Microtechnologies for Air-Cooled Exchangers
The Microtechnologies for Air-Cooled Exchangers (MACE) Heat Sink Enhancement program will explore emerging concepts for enhancement of the performance of heat rejection systems throughout the DoD. Specific program goals include the reduction of the thermal resistance by a factor of 4x and reducing the power consumption of the cooling system by 3x. Successful projects will apply MACE technologies to a customer-specified application.
FY 2009 Plans:
− Demonstrate models, measurements, and Single-Fin device.
− Establish functional full-scale heat sink 4”x4”x1” with 4x reduction in thermal resistance and 3x improvement in coefficient of performance.
FY 2010 Plans:
- Fabricate and test a ‘single-fin’ heat sink device.
- Scale up prototype air-cooled exchangers to a large, full-format heat sink.
7. Maskless Direct-Write Nanolithography for Defense Applications
The Maskless Direct-Write Nanolithography for Defense Applications program will develop a maskless, direct-write lithography tool that will address both the DoD’s need for affordable, high performance, low volume Integrated Circuits (ICs) and the commercial market’s need for highly customized, application-specific ICs. In addition, this program will provide a cost effective manufacturing technology for low volume nanoelectromechanical systems (NEMS) and nanophotonics initiatives within the DoD. Transition will be achieved by maskless lithography tools, installed in the Trusted Foundry and in commercial foundries, which will enable incorporation of state-of-the-art semiconductor devices in new military systems, and allow for the cost-effective upgrade of legacy military systems.
Program Plans:
FY 2007 Accomplishments:
− Completed and delivered End-to-End System Error Budget and throughput model.
FY 2008 Plans:
− Design, build and integrate a demagnification optics system and wafer adapter, and achieve a patterning resolution on the wafer of
about 1 micron.
− Characterize prototype Reflection Electron Branch Lithography (REBL) system to validate simulation results.
FY 2009 Plans:
− Demonstrate rotary stage at 10 meters per second.
− Demonstrate static imaging on prototype REBL system.
− Demonstrate dynamic imaging on prototype REBL system.
FY 2010 Plans:
- Demonstrate System Level Lithography Performance on a Linear Stage Demonstrator System.
- Design, build, and test a rotary stage.
- Integrate electron beam column and rotary stage demonstrator platform.
- Design, build, and characterize an enhanced electron beam column for system alpha prototype experiments.
8. Disruptive Manufacturing Technologies
The goal of the Disruptive Manufacturing Technologies (DMT) program is to achieve significant and pervasive cost savings, and/or decreases in cycle time, for existing or planned procurements. There has been a long-standing desire to replace traveling wave tube amplifiers (TWTAs), which are pervasive in nearly all electronic warfare (EW), information warfare (IW), radar, and communication systems, with lower cost solid-state components. The DMT program will merge Polystrata™ and GaN technologies to eliminate the need for monolithic microwave integrated circuits (MMICs). The direct product replacement transition candidate for this program is the TWT power amplifier output stage in the AN/ALE-55, Fiber Optic Towed Decoy for the Navy’s new F/A-18 E/F Super Hornet, and the Air Force B1-B and F-15 platforms. It will be replaced with solid-state hybrid microwave integrate circuit (HyMIC) modules developed by merging Polystrata™ and gallium nitride (GaN) technologies. The result will be a 10x reduction in TWTA cost, equaling >$150M for the Integrated Defensive Electronic Countermeasures (IDECM) program, a joint Navy-Air Force program. Beyond developing a replacement for TWTAs, HyMIC technology promises to increase adoption of high performance MMW systems employing mature III-V technologies as well as advance earlier adoption of those using nascent III-V technologies.
FY 2007 Accomplishments:
− Demonstrated integration of GaN transistors and passive elements with Polystrata™ waveguides.
FY 2008 Plans:
− Demonstrate flip chip mounting on Polystrata™ structures.
− Complete proof-of-concept GaN 20 watts module implemented with Polystrata™ technology, along with a passive element library to enable development of the 57 W GaN building block.
FY 2009 Plans:
− Demonstrate a form-fit-function 160 W GaN amplifier ready for insertion into the IDECM decoy module.
FY 2010 Plans:
- Demonstrate 57 W GaN HyMIC building block.
9. Tip-Based Nanofabrication (TBN)
The Tip-Based Nanofabrication (TBN) program will develop the capability to use Atomic Force Microscope (AFM) cantilevers and tips to controllably manufacture nano-scale structures such as nanowires, nanotubes, and quantum dots for selected defense applications such as optical and biological sensors, diode lasers, light emitting diodes, infrared sensors, high-density interconnects, and quantum computing.
FY 2008 Accomplishments:
- Selected initial fabrication materials, mechanisms, and processes for optimal properties.
- Completed preliminary design of specialized processing equipment.
FY 2009 Plans:
- Demonstrate nanofabrication process using a single-tip structure and associated tooling.
FY 2010 Plans:
- Fabricate a multi-tip array (5 tips) for parallel manufacturing.
- Demonstrate a repeatable tip-based process and manufacturing capability.
10. Programmable Matter
The Programmable Matter program will develop a new functional form of matter, constructed from mesoscale particles that assemble into complex 3-Dimensional (3-D) objects upon external command. These objects will exhibit all of the functionality of their conventional counterparts and ultimately have the ability to reverse back to the original components.
FY 2009 Plans:
- Build a mathematical model that theoretically confirms a viable procedure for constructing macroscopic
3-D solid objects with functional properties that have real world use.
- Demonstrate externally-directed assembly of distinct macroscopic 3-D solids.
- Demonstrate interlocking/adhesion of mesoscale particles to create bulk matter.
- Demonstrate reversibility.
FY 2010 Plans:
- Optimize Programmable Matter properties.
- Demonstrate Programmable Matter for selected applications.
A previous Nextbigfuture article on DARPA's programmable matter project with pictures.
11. Quantum OptoMechanics Integrated on a Chip
The objective of this program is to leverage advances in Photonics and Micro fabrication to develop integrated chips capable of exploiting quantum optomechanical applications. Although light is usually thought of as carrying energy but relatively little momentum, light confined to a high-finesse cavity can exert significant force on the cavity mirrors. When the mirror is allowed to vibrate by coupling it to a
mechanical (spring-like) system, energy can be transferred between coupled optomechanical resonators. Depending on the detuning of the cavity, one can obtain either damping (cooling) or amplification (heating) of the mirror motion. Notable achievements in this field are the demonstration of mirror cooling (damping of the internal degree of motion) to sub-Kelvin (6 mK) temperatures and demonstration of radiation driven high-Q, high-frequency (1 GHz) oscillators. With sufficiently high cavity finesse and Q’s of the mechanical system, it is possible to reach a regime in which the mirror motion is no longer thermally limited. Instead, it becomes limited by the quantum mechanical radiation pressure force. Once this limit is reached, it
is possible to take advantage of quantum mechanical effects without having to cool the system. It is anticipated this will result in a new generation of mass-sensing devices and ultra high-Q, high-frequency resonators controlled by light. In optical systems, it will be possible to efficiently squeeze light beyond the standard shot-noise limit producing light sources for infrared detection and quantum information
applications.
FY 2010 Plans:
- Demonstrate resonant frequency of 10 megahertz (MHz).
- Demonstrate Mechanical Q of 1x10^6.
12. Nanoscale/Biomolecular and MetaMaterials
The research in this thrust area exploits advances in nanoscale and bio-molecular materials, including computationally based materials science, in order to develop unique microstructures and material properties. This area also includes efforts to develop the underlying physics for the behavior of materials whose properties have been engineered at the nanoscale level (metamaterials) and materials exhibiting a permanent electric charge (charged matter).
FY 2008 Accomplishments:
- Developed efficient computational methods that correctly predict the properties of excited electronic states in high intensity laser.
- Achieved mid-wave infrared optical transmission comparable to that of spinel and worked toward achieving a composite material with mechanical properties comparable to those of sapphire in yttriamagnesia nanocomposite material.
- Achieved first-ever optical model for nanomaterials of interest and transitioned it to the research community.
- Achieved yttria, nano silicon carbide optical ceramics with required strength of sapphire and worked toward optical properties of spinel.
FY 2009 Plans:
- Demonstrate automated laser beam front diagnostic and adaptive beam correction.
- Demonstrate simultaneously infrared optical transmission comparable to spinel and mechanical properties comparable to sapphire in 75mm discs.
- Develop new materials with both optical properties and strength into 75mm flat discs.
- Characterize the material properties of 75mm discs through testing in relevant environments.
- Demonstrate the ability to provide surface strengthening through compressive materials.
- Investigate new methods of altering diatom structures and adapting diatom materials to facilitate new sensors and devices.
FY 2010 Plans:
- Initiate development of new materials into hemispherical domes with decreased optical scatter, doubled mechanical strength, and doubled thermal shock capabilities over single crystal sapphire.
- Characterize the material properties of hemispherical domes through testing in relevant military environments.
- Characterize the material properties of non-hemispherical domes.
- Develop inexpensive processing techniques to create customized diatom derived sensors and devices.
- Ion: demonstrate ability to affect airflow around the surface of an airfoil using ions accelerated across multiple points to generate an airstream on the surface of the airfoil.
- Radiometer: demonstrate ability to produce significant forces on aerofoil-shaped surfaces.
- Establish the material science of charged matter by developing underlying technology and defining range of applicability.
- Demonstrate in a laboratory environment charged matter properties including superadhesion, frictionless surfaces, and resistance to electrostatic charging.
12. Atomic Scale Materials and Devices
This thrust examines the fundamental physics of materials at the atomic scale in order to develop new devices and capabilities. A major emphasis of this thrust is to provide the theoretical and experimental underpinnings of a new class of semiconductor electronics based on spin degree of freedom of the electron, in addition to (or in place of) the charge. A new all optical switch capability will also be investigated. It includes a new, non-invasive method to directly hyperpolarize biological tissues, leading to novel quantitative neurodiagnostics. In addition, this thrust will examine other novel classes of materials and phenomena such as plasmons or Bose-Einstein Condensates (BEC) that have the potential to provide new capabilities in the quantum regime, for example, GPS-independent navigation via atom interferometry as well as the potential to generate significant heat from deuterated palladium.
FY 2010 Plans:
- Develop cooling and precision thermometry techniques for fermionic atoms in optical lattice.
- Develop quantum gas microscope with sufficient resolution to image individual atomic sites in 2-D optical lattice; verify by imaging atomic gas trapped in lattice.
- Emulate XXZ quantum spin model using ion crystal array in less than twelve hours that confirms theoretical calculations.
- Develop the core materials fabrication techniques that will enable extremely low-power, extremely high density, all-oxide, transistor-like switches with a ferroelectric gate and a high density, 2-D interfacial oxide electron gas exhibiting metal-insulator transition in response to an applied gate voltage.
- Model how these transistor-like devices will support corresponding device architecture for advanced reconfigurable logic and memory.
- Design broadband, frequency comb spectroscopy system with sensitivity better than ten parts per billion acetylene at 1.5 microns.
- Evaluate performance improvements from, and system configuration changes needed to, shift comb central wavelength from 1.5 microns to 3 microns.
- Quantify the effects of impurities in palladium substrate material on the capability to generate excess heat. composition and microstructure required to achieve high levels of deuterium loading and tolerate the high stresses associated with these conditions.
- Establish the effects of surface area and crystal orientation on degree of deuterium loading and the loading/relaxation dynamics and correlate these effects with increases in excess heat generated.
- Demonstrate all-optical switch (or equivalent device) based on optically-induced absorption.
- Demonstrate total energy dissipation for an optical switch (or equivalent device) of less than 1 femtojoules per operation, and signal loss of less than 0.1 dB, excluding waveguide losses before and after device.
- Demonstrate soft X-rays with specific states of orbital angular momentum.
- Initiate a series of experiments using the High Frequency Active Auroral Research Program (HAARP) facility to study ionospheric and trans-ionospheric phenomena, including optimization of high frequency to very low frequency conversion efficiency, generation and propagation and characterization
13. Casimir Effect Enhancement (CEE)
This program’s goal is to manipulate materials properties and geometries in order to enable repulsive Casimir forces at interfaces. This can lead to increased reliability in Micro Electrical Mechanical Systems (MEMS) devices by eliminating stiction, reduced drag and increased fuel efficiency in all military systems (boats, airplanes, etc.), or enhancing any system where attractive forces hinder overall performance.
FY 2010 Plans:
- Model potential systems where Casimir forces can be manipulated.
- Experiment to confirm ability to reduce Casimir force.
- Demonstrate nanomechanical device with observable, repeatable ten percent reduction in adhesive forces.
14. Rocket Propelled Grenade (RPG) Nets
The goal of the Rocket Propelled Grenade (RPG) Nets program is to develop a near-term counter RPG net system that has performance at least equivalent to bar or slat armor but that is lighter and easier to deploy; and a mid-term net-based system with active elements that has greatly improved performance. Development of these systems will be supported by modeling to enhance understanding of the net interactions and with extensive live fire testing against RPGs. Successful candidates will be installed on vehicles for evaluation in an operational context.
FY 2010 Plans:
- Begin user evaluation of active net system.
15. High Energy Liquid Laser Area Defense System (HELLADS)
The goal of the High Energy Liquid Laser Area Defense System (HELLADS) program is to develop a high-energy laser weapon system (150 kW) with an order of magnitude reduction in weight compared to existing laser systems. With a weight goal of <5 kg/kW, HELLADS will enable high-energy lasers (HELs) to be integrated onto tactical aircraft and will significantly increase engagement ranges compared to ground-based systems. The HELLADS program has completed the design and demonstration of a revolutionary prototype unit cell laser module that has demonstrated power output and optical wavefront performance that supports the goal of a lightweight and compact 150 kW high energy laser weapon system with near-diffraction limited beam quality. An objective unit cell laser module with integrated power and thermal management is being designed and fabricated by two competing laser suppliers and will demonstrate an output power of >34 kW. Based on the results of the unit cell demonstration, additional laser modules will be fabricated to produce a 150 kW laser that will be demonstrated in a laboratory environment. The 150 kW laser will then be integrated with beam control, power, heat exchange, safety, and command and control subsystems that are based upon existing technologies to produce a laser weapon system demonstrator. The capability to shoot down tactical targets such as surface-to-air missiles and rockets and the capability to perform ultra-precise offensive engagements will be demonstrated in a realistic ground test environment. The HELLADS laser will then be transitioned to the Air Force for aircraft integration and flight testing.
FY 2010 Plans:
- Initiate fabrication of additional unit cell laser modules to complete the 150 kW laser.
- Complete the fabrication and laboratory testing of the 150 kW laser.
- Complete fabrication of the demonstrator laser weapon system.
- Complete demonstrator laser weapon system component and subsystem testing.
- Initiate integration of the 150 kW laser with the laser weapon system.
16. Revolution in Fiber Lasers (RIFL)
The goal of the Revolution in Fiber Lasers (RIFL) program is to develop multi-kilowatt, singlemode, narrow line fiber laser amplifiers using efficient, high brightness laser diode pump arrays. These narrowline fiber laser amplifiers can then be coherently combined to develop ultra-high power electronically steerable optical phased arrays. In Phase 1 of this program, a 1 kW narrowline, single mode, single
polarization fiber laser amplifier will be developed with 15% electrical efficiency and a beam quality of better than 1.4x diffraction limited. In Phase 2 of this program, a 3 kW narrowline, single mode, single polarization fiber laser amplifier will be developed with 30% overall electrical efficiency and better than 1.4x diffraction limited beam quality. Coherent arrays of these high power fiber laser amplifiers will then be developed as part of the DARPA Adaptive Photonic Phase-Locked Elements (APPLE) program (PE0603739E, Project MT-15) to achieve the requisite power and coherence for future multi-kilowatt high power laser weapons.
FY 2008 Accomplishments:
- Performed final engineering designs of a 1 kW coherently combinable fiber amplifier (single mode, single polarization, narrow line) that will support development of a high power fiber laser optical phased array and that will provide >15% electrical efficiency and near-diffraction-limited beam quality (M2 < 1.4).
FY 2009 Plans:
- Initiate construction of 1 kW coherently combinable fiber amplifiers (single mode, single polarization, narrow line) that will support development of a high power fiber laser optical phased array and that will provide >15% electrical efficiency and near-diffraction-limited beam quality (M2 < 1.4).
- Complete final engineering design of a 3kW, 30% efficient, near-diffraction-limited coherently combinable fiber laser amplifier (single mode, single polarization, narrow line) that will support development of high power fiber laser optical phased arrays for laser weapon applications.
FY 2010 Plans:
- Demonstrate and test 15% efficient, single mode, single polarization, coherently combinable fiber laser amplifiers with near diffraction-limited beam quality at 1kW power level.
17. Maintaining Combat Performance
The Maintaining Combat Performance thrust utilizes breakthroughs in biology and physiology to sustain the peak physical and cognitive performance of warfighters operating in extreme conditions. Today, warfighters must accomplish their missions despite extraordinary physiologic stress. Examples of these stressors include extremes of temperature (-20 degrees F to 125 degrees F), oxygen deficiency in mountains, personal loads in excess of 100 lbs, dehydration, psychological stress, and even performance of life-sustaining maneuvers following combat injury. Not only must troops maintain optimum physical performance, but also peak cognitive performance, which includes the entire spectrum from personal navigation and target recognition, to complex command and control decisions, and intelligence synthesis. The Maintaining Combat Performance thrust leverages breakthroughs in diverse scientific fields in order to mitigate the effects of harsh combat environments. For example, understanding the natural mechanisms for core body temperature regulation in hibernating mammals has led to a novel, practical approach for soldier cooling, which is now being evaluated by troops in the far forward combat areas. Other examples include fundamental research elucidating the biological mechanisms of adaptation to extreme altitude, the molecular correlates of muscle fatigue and psychological stress, and natural resistance to disease through dietary nutrients.
FY 2008 Accomplishments:
- Identified genetic indicators of acute mountain sickness and developed approaches to improve cardiopulmonary function at high altitude.
- Demonstrated greater than forty percent improvement from preconditioning prior to high altitude exposure in murine model.
FY 2009 Plans:
- Identify mechanisms to alleviate high altitude illness.
- Investigate mechanisms to speed natural acclimatization at high altitudes.
- Demonstrate the following in-vitro: mechanisms to increase pulmonary blood flow; methods to increase number of red blood cells; and mechanisms to increase oxygen delivery to muscles.
- Position product for use in an FDA Phase I clinical trial by the end of first program phase.
FY 2010 Plans:
- Increase speed acclimatization by providing high altitude cues prior to ascent.
- Identify physical adaptation strategies of altitude-adapted people.
- Demonstrate high altitude illness prevention in mammals using adaptation strategies of altitude-adapted people.
18. Systems of Neuromorphic Adaptive Plastic Scalable Electronics (SyNAPSE)
The Systems of Neuromorphic Adaptive Plastic Scalable Electronics (SyNAPSE) program will develop a brain inspired electronic “chip” that mimics the function, capacity, size, and power consumption of a biological cortex. If successful, the program will provide the foundations for functional machines to supplement humans in many of the most demanding situations faced by warfighters today. In particular, the objective of the program is to process video images for information abstraction (e.g. annotation) and task initiation. The two main technical challenges to achieving this vision are developing an artificial electronic synapse and developing a neural algorithm-architecture that exploits these synapses.
FY 2010 Plans:
- Develop a brain-inspired neuromorphic architectural design and specification capability.
- Develop software tools to translate neuromorphic designs into electronic implementations using hybrid CMOS and high-density electronic synapse components.
- Develop capability to simulate the performance of neuromorphic electronics systems using very large scale computation.
- Develop virtual reality environments intended for training and evaluating electronic neuromorphic systems and their corresponding computer simulations.
- Develop standard testing protocols for assessing the performance of large neuromorphic electronic systems.
19. Vulcan
The goal of the Vulcan demonstration program, previously funded from PE 0602702E, Project TT-07 (HiSTED Program), is to design, build and ground test an engine capable of accelerating a full scale hypersonic vehicle from rest to Mach 4+. Constant Volume Combustion (CVC) engines have been under development for more than a decade. Considerable progress has been made and the technology is believed mature enough to enable a dramatic new propulsion system capability. CVC engines, when combined with turbine engines, offer the ability to design a new class of Mach 4+ air breathing engines. The Vulcan engine will consist of a CVC engine, a full-scale turbine engine, an inlet and a nozzle. CVC engine architectures could include Pulsed Detonation Engines (PDE’s), Continuous Detonation Engines (CDE’s) or other unsteady CVC engine architectures. The CVC engine would operate from below the upper Mach limit of the turbine engine to Mach 4+. The turbine engine will be a current production engine capable of operating above Mach 2. Key objectives of the program are to integrate the turbine engine into the Vulcan engine with minimal modification to the turbine engine; to operate the turbine engine from rest to its upper Mach limit; and to cocoon the turbine engine when it is not in use. The Vulcan engine will enable full-scale hypersonic cruise vehicles for Intelligence, Surveillance and Reconnaissance (ISR), strike or other critical national missions.
FY 2010 Plans:
- Complete designs and simulations of critical components.
- Conduct risk reduction demonstrations of the combustor rig, fuel system, material rig, valve rig, initiator rig, seal rig, inlet rig, nozzle rig, and thermal management system rig components.
- Complete CVC engine preliminary design review.
- Initiate detailed design of subsystems.
20. Ultradense Nanophotonic Intrachip Communication (UNIC)
The goal of the Ultradense Nanophotonic Intrachip Communication (UNIC) program is to demonstrate nanophotonic technology for access to on-chip ultra-dense systems and Input/Output (I/O) to/from a chip containing such ultra-dense systems. Technical challenges that must be met include: high precision, low loss nanophotonic circuit fabrication; low cost fabrication methods; high performance nanoscale modulators; detectors, multiplexers and demultiplexers; architecture for addressing ultra-dense systems; and techniques for efficient high capacity/bandwidth I/O of data to and from the chip. This technology will transition via industrial performers developing faster and more complex processing such as real-time pattern matching, target recognition, image processing and Terahertz (THz) class command-and-control networks.
FY 2010 Plans:
- Demonstrate integrated arrays of 4-wavelength silicon photonic transmitters and receivers operating at 10 gigabytes per second (Gbps).
- Demonstrate feasibility of 1.5 per Joule/bit interconnect link energy budget for silicon photonic optical data link, based upon fabricated arrays.
- Demonstrate wavelength division multiplexed routing through 2 physical layers at 10 Gbps and less than one part in a trillion bit error rate (1E-12 bit error rate).
Research links Nitrates Levels Contribute as Cause of Alzheimers, Diabetes and Parkinson and 5 Cups of Coffee Can Protect Against Alzheimers
1. A new study by researchers at Rhode Island Hospital have found a substantial link between increased levels of nitrates in our environment and food with increased deaths from diseases, including Alzheimer's, diabetes mellitus and Parkinson's. The study was published in the Journal of Alzheimer's Disease.
2. When aged mice bred to develop symptoms of Alzheimer's disease were given caffeine - the equivalent of five cups of coffee a day - their memory impairment was reversed, report University of South Florida researchers at the Florida Alzheimer's Disease Research Center
The researchers graphed and analyzed mortality rates, and compared them with increasing age for each disease. They then studied United States population growth, annual use and consumption of nitrite-containing fertilizers, annual sales at popular fast food chains, and sales for a major meat processing company, as well as consumption of grain and consumption of watermelon and cantaloupe (the melons were used as a control since they are not typically associated with nitrate or nitrite exposure).
The findings indicate that while nitrogen-containing fertilizer consumption increased by 230 percent between 1955 and 2005, its usage doubled between 1960 and 1980, which just precedes the insulin-resistant epidemics the researchers found. They also found that sales from the fast food chain and the meat processing company increased more than 8-fold from 1970 to 2005, and grain consumption increased 5-fold.
The authors state that the time course of the increased prevalence rates of Alzheimer's, Parkinson's and diabetes cannot be explained on the basis of gene mutations. They instead mirror the classical trends of exposure-related disease. Because nitrosamines produce biochemical changes within cells and tissues, it is conceivable that chronic exposure to low levels of nitrites and nitrosamines through processed foods, water and fertilizers is responsible for the current epidemics of these diseases and the increasing mortality rates associated with them.
De la Monte states, "If this hypothesis is correct, potential solutions include eliminating the use of nitrites and nitrates in food processing, preservation and agriculture; taking steps to prevent the formation of nitrosamines and employing safe and effective measures to detoxify food and water before human consumption."
2. When aged mice bred to develop symptoms of Alzheimer's disease were given caffeine - the equivalent of five cups of coffee a day - their memory impairment was reversed, report University of South Florida researchers at the Florida Alzheimer's Disease Research Center
The just-published Florida ADRC study included 55 mice genetically altered to develop memory problems mimicking Alzheimer's disease as they aged. After behavioral tests confirmed the mice were exhibiting signs of memory impairment at age 18 to 19 months - about age 70 in human years - the researchers gave half the mice caffeine in their drinking water. The other half got plain water. The Alzheimer's mice received the equivalent of five 8-oz. cups of regular coffee a day. That's the same amount of caffeine - 500 milligrams -- as contained in two cups of specialty coffees like Starbucks, or 14 cups of tea, or 20 soft drinks.
At the end of the two-month study, the caffeinated mice performed much better on tests measuring their memory and thinking skills. In fact, their memories were identical to normal aged mice without dementia. The Alzheimer's mice drinking plain water continued to do poorly on the tests.
In addition, the brains of the caffeinated mice showed nearly a 50-percent reduction in levels of beta amyloid, a substance forming the sticky clumps of plaques that are a hallmark of Alzheimer's disease. Other experiments by the same investigators indicate that caffeine appears to restore memory by reducing both enzymes needed to produce beta amyloid. The researchers also suggest that caffeine suppresses inflammatory changes in the brain that lead to an overabundance of beta amyloid.
China Targets 15% Energy from Solar and Wind by 2020
China is ratcheting up the target of how much of its energy it obtains from renewable resources such as solar and wind to 15 percent by 2020.
The United States is heading towards a similar target for solar and wind
* House bill requires 15 pct renewable power by 2020
* Obama, green groups wanted 25 pct renewable by 2025
China government planners said they could hit the 10 percent target by 2010. The China Daily quoted one vice minister who suggested the country might be able to hit a 20 percent target by 2020.
The new goal comes as China is also raising its projections for the amount of total annual energy it will generate by 2020 to 1,500 GigaWatts, a 50 percent increase from a target level set in 2007. China had installed capacity to generate 793 GW by the end of 2008, as much as two-thirds of that from coal
China Daily has details on china's new energy plans
As previously reported, China is planning for 86GW of nuclear power in 2020 and 150 GW of Wind. Hydroelectric power will stay at about 20% with 300 GW of hydro in 2020.
China has 14 nuclear reactors under construction now and several more are to begin construction before the end of 2009.
China's wind power sector has enjoyed a 100 per cent annual growth in the past three years, and its wind power installed capacity is expected to exceed 30 GW by the end of 2010, up from 12 GW last year.
China plans to build seven wind power bases, with a minimum capacity of 10 GW each by 2020, in a move that will dramatically increase the country's use of renewable energy reports China Daily. $146 billion will be spent on this.
The seven bases are to be located in:
• Jiuquan in the Gansu Province
• Hami in Xinjiang Uygur autonomous region
• Hebei Province
• Western Jilin Province
• Eastern Inner Mongolia
• Western Inner Mongolia
• Jiangsu Province
China's 2020 energy mix:
1500GW total
86 GW of nuclear power (almost 6% nuclear)
150-290 GW of Wind (nuclear actually providing more energy because of 34% capacity for wind, versus 90% capacity for nuclear). The 20% target for solar and wind means a lot more wind (10-19% from wind). 15% solar and wind means about 215GW from wind.
300GW of hydro (20% from hydro)
10 GW of solar (about 1% from solar)
100GW or so from biomass and natural gas (5-10% from natural gas and biomass)
Coal could be less than 50% of China's energy mix in 2020.
China is cleaning up its coal plants as well. Changing to ultrahigh temperature reactors and IGCC reactors.
This year, China's power capacity will surpass 900 gW.
Zhang said China would restructure its electricity supply mix by supporting more investments in nuclear, solar, wind and biomass energy resources.
In line with the revised target, the ratio of nuclear power to the combined installed electricity capacity would increase to 5 percent in 2020.
On solar power, the NDRC's Energy Research Institute reported that China's 2020 target would be expanded from 1,800 megawatts (mW) of installed solar capacity established in 2007 to 10,000 mW or more.
July 04, 2009
House and Senate Climate Bills and Stimulus Bill Energy Impact
The last few months and the next few months are seeing a flurry of energy bills and energy impacting legislation.
Stimulus Bill's Energy Impact
The stimulus bill (America Recovery and Reinvestment Act 2009) ARRA allocated a total of $9.45 billion to weatherize and/or increase the energy efficiency of low-income housing and assist local governments in implementing energy efficiency programs.
ARRA allocates $3.1 billion for States to implement or enhance energy efficiency programs.
ARRA contains several changes to the plug-in hybrid electric vehicle (PHEV) tax credit originally included in the Energy Improvement and Extension Act of 2008 that have been included in the updated reference case. For example, ARRA allows a $2,500 tax credit for the purchase of qualified PHEVs with a battery capacity of at least 4 kilowatthours. Starting at a battery capacity of 5 kilowatthours, PHEVs earn an additional $417 per kilowatthour battery credit up to a maximum of $5,000. The maximum total PHEV credit that can be earned is capped at $7,500 per vehicle.
Prior to the passage of ARRA, the production tax credit (PTC) for certain renewable technologies was to expire on January 1, 2010. ARRA extended this date to January 1, 2013, for wind and January 1, 2014, for all other eligible renewable resources. In addition, ARRA allows companies to choose an investment tax credit (ITC) of 30 percent in lieu of the PTC and allows for a grant in lieu of this credit to be funded by the U.S. Treasury.
ARRA provides $6 billion to pay the cost of guarantees for loans authorized by the Energy Policy Act of 2005.
Wind generation with the ARRA is expected to be more than twice tha
projected in the no-stimulus case, 201 billion kilowatthours compared to 86 billion
kilowatthours and estimated generation of 53 billion kilowatthours in 2008.
ARRA reduces commercial sector energy expenditures by an average of $5.7 billion
(2.7 percent) annually (real 2007 dollars) between 2010 and 2030.
Excluding transportation-related expenditures, total residential and commercial
energy bills are $13 billion (2.6 percent) and $21 billion (3.8 percent) lower
respectively in 2020 and
In the AEO2009 reference case, with assumptions developed prior to the current economic downturn, domestic cellulosic ethanol production was projected to reach 150 million gallons in 2012. However, a review of projects proceeding towards construction, suggests that, without assistance, only about 74 million gallons of domestic cellulosic ethanol production capacity will be built by 2012, because financing for these developers has become extremely difficult to obtain and some projects have been canceled. With the loan guarantees arising from the stimulus package, it is assumed that the 2012 production rises back to about 110 to 170 million gallons, with additional capacity additions occurring under the same financing structure as in AEO2009.
ARRA provides $3.4 billion for additional research and development on fossil energy
technologies.
ARRA provides $4.5 billion for smart grid demonstration projects. The funds
provided will not fund a widespread implementation of smart grid technologies. In July 2004 the Electric Power Research Institute (EPRI) estimated that full deployment would cost $165 billion. However, successful deployment of several demonstration projects could stimulate more rapid investment than would otherwise occur. Smart grid technologies generally include a wide array of measurement, communications, and control equipment employed throughout the transmission and distribution system that will enable real-time monitoring of the production, flow, and use of power from generator to consumer.
In the updated reference case, it is assumed that the Federal expenditures on
smart grid technologies will stimulate further efforts to lower losses, reducing them by an additional 10 to 15 billion kilowatthours, roughly one-third the maximum EPRI estimate. In a 2008 report, EPRI estimated that smart grid technologies could reduce line losses in 2030 by between 3.5 and 28.0 billion kilowatthours
House and Senate Climate Bills
Kansas City Star reports the nonprofit American Council for an Energy-Efficient Economy examined the bill's efficiency provisions and concluded that they would save 1.4 million barrels of oil per day in 2030. That's roughly 10 percent of the projected use of 14.3 million barrels a day in that year, according to the government's Energy Information Administration.
The Environmental Protection Agency put the oil savings at 700,000 barrels a day by 2030. The EPA looked mainly at the bill's terms that would put a declining cap on the amount of emissions of heat-trapping gases allowed each year and create a pollution-permit trading system.
EPA's analysis showed only a modest decrease because the bill would have little impact on the price of gasoline - and thus little impact on people's driving behavior and choice of cars. EPA estimated that gasoline prices would go up about 25 cents a gallon in 2030 as a result of the bill.
The House-passed climate legislation focuses primarily on electricity generation. Its backers said they sought the quickest and cheapest ways to bring down U.S. emissions to 83 percent below 2005 levels by 2050.
The senate bill will yield energy efficiency savings of about 2 quadrillion Btu’s of energy (“quads”) in 2020 and nearly 4 quads in 2030, according to a preliminary analysis released today by the American Council for an Energy-Efficient Economy (ACEEE). ACEEE estimates that this bill will save about half of the energy in 2020 and one-third of the energy in 2030.
ACEEE estimates that 70% of the 2020 energy savings in the Senate bill will come from buildings, including a major building retrofit program, improvements to building codes, and a variety of other buildings provisions. Of the remaining savings, 18% are from new minimum efficiency standards on appliances and 12% from industrial programs
Impact of 25% renewable energy requirement
The RES program analyzed in this report has the following characteristics:
The program begins in 2012 with the required renewable share starting at 6 percent and growing in scheduled increments to 25 percent in 2025. The program sunsets in 2040.
Power sellers with retail sales of at least 1 billion kilowatthours (1,000,000 megawatthours) are covered. Entities with retail sales below this level are exempt.
Generation from existing hydroelectric and municipal solid waste (MSW) facilities are not included in the base electricity sales but also do not earn compliance credits.
Most of the projected increase in wind generation is due to existing State renewable portfolio standard programs and the passage of ARRA. This occurs in both the reference case and the RES cases. Total wind generation in the two RES cases is projected to increase from 32 billion kilowatthours in 2007 to between 208 billion kilowatthours and 249 billion kilowatthours in 2030. Total biomass generation increases from 39 billion kilowatthours in 2007 to between 438 billion kilowatthours and 577 billion kilowatthours in 2030 in the two RES cases. The renewable provisions of ARRA do not have as large an impact on biomass as on wind, because the production subsidies provided for the co-firing of biomass are smaller and because new dedicated biomass plants generally take longer to develop than would be required to meet the deadline to qualify for production subsidies under ARRA.
The higher renewable generation stimulated by the Federal RES leads to lower coal and natural gas generation. In the two RES cases, coal generation ranges between 182 billion kilowatthours (8 percent) and 257 billion kilowatthours (11 percent) below the reference case level. Similarly, natural gas generation in the two RES cases in 2030 is between 55 billion kilowatthours (6 percent) and 150 billion kilowatthours (15 percent) below the level projected in the reference case.
Given the amount of eligible renewable generation projected in the reference case, the RES is not expected to affect national average electricity prices until after 2020. As the required RES share increases to its maximum value in 2025, the value of RES credits increases, and impacts on national average electricity prices become evident. The peak effect on national average electricity prices, 2.7 percent in the RESFEC case and 2.9 percent in the RESNEC case, occurs as the required renewable share ramps up more rapidly than the demand for electricity is growing. In the later years of the projections, the impact on national average electricity prices is smaller, as the impact of the RES requirement on the cost of coal and natural gas, fuels whose use is reduced by added renewables, is increasingly reflected in electricity prices. By 2030, electricity prices are projected to be little changed from the reference case in both RES cases, with 2030 prices less than 1 percent higher than in the reference case.
Main page for EIA Energy analysis.
Laser Switched Optical Transistor Could Enable future generation of ultrafast light-based computers
An artist's impression of a molecule acting as a transistor that makes it possible to use one laser beam to tune the power of another (Image: Robert Lettow)
An optical transistor that uses one laser beam to control another could form the heart of a future generation of ultrafast light-based computers, say Swiss researchers.
Conventional computers are based on transistors, which allow one electrode to control the current moving through the device and are combined to form logic gates and processors. The new component achieves the same thing, but for laser beams, not electric currents.
A green laser beam is used to control the power of an orange laser beam passing through the device.
They suspended tetradecane, a hydrocarbon dye, in an organic liquid. They then froze the suspension to -272 °C using liquid helium – creating a crystalline matrix in which individual dye molecules could be targeted with lasers.
When a finely tuned orange laser beam is trained on a dye molecule, it efficiently soaks up most of it up – leaving a much weaker "output" beam to continue beyond the dye.
But when the molecule is also targeted with a green laser beam, it starts to produce strong orange light of its own and so boosts the power of the orange output beam.
This effect is down to the hydrocarbon molecule absorbing the green light, only to lose the equivalent energy in the form of orange light.
"That light constructively interferes with the incoming orange beam and makes it brighter," says Sandoghar's colleague Jaesuk Hwang.
Abstract at the journal Nature: A single-molecule optical transistor
a, Energy level scheme of a molecule with ground state (|1), and ground (|2) and first excited (|3) vibrational states of the first electronic excited state. Manifold |4 shows the vibronic levels of the electronic ground state, which decay rapidly to |1. Blue arrow, excitation by the gate beam; green double-headed arrow, coherent interaction of the CW source beam with the zero-phonon line (ZPL); red arrow, Stokes-shifted fluorescence; black dashed arrows, non-radiative internal conversion. b, Time-domain description of laser excitations and corresponding response of the molecule simulated by the Bloch equations with periodic boundary conditions. Blue spikes and red curve represent the pump laser pulses and the population of the excited state |2, respectively. Black curve shows the time trajectory of Im(21). Straight green line indicates the constant probe laser intensity that is on at all times. Inset, magnified view of curves during a laser pulse. c, Schematic diagram of the optical set-up. BS, beam splitter; LP, long-pass filter; BP, band-pass filter; HWP, half-wave plate; LPol, linear polarizer; S, sample; SIL, solid-immersion lens; PD1, PD2, avalanche photodiodes. Transmission of the probe beam (green) is monitored on PD1, and the Stokes-shifted fluorescence (red) is recorded on PD2.
The transistor is one of the most influential inventions of modern times and is ubiquitous in present-day technologies. In the continuing development of increasingly powerful computers as well as alternative technologies based on the prospects of quantum information processing, switching and amplification functionalities are being sought in ultrasmall objects, such as nanotubes, molecules or atoms. Among the possible choices of signal carriers, photons are particularly attractive because of their robustness against decoherence, but their control at the nanometre scale poses a significant challenge as conventional nonlinear materials become ineffective. To remedy this shortcoming, resonances in optical emitters can be exploited, and atomic ensembles have been successfully used to mediate weak light beams. However, single-emitter manipulation of photonic signals has remained elusive and has only been studied in high-finesse microcavities or waveguides. Here we demonstrate that a single dye molecule can operate as an optical transistor and coherently attenuate or amplify a tightly focused laser beam, depending on the power of a second 'gating' beam that controls the degree of population inversion. Such a quantum optical transistor has also the potential for manipulating non-classical light fields down to the single-photon level. We discuss some of the hurdles along the road towards practical implementations, and their possible solutions.
Nature's editor's summary of nanoptics and optical transistors.
Quantum information processing systems and related technologies are likely to involve switching and amplification functions in ultrasmall objects such as nanotubes. In today's electronic devices the transistor performs these functions. A 'quantum age' equivalent of the conventional transistor would, ideally, use photons rather than electrons as information carriers because of their speed and robustness against decoherence. But robustness also stops them being easily controlled. Now a team from optETH and ETH in Zurich demonstrates the realization of a single-molecule optical transistor. In it, a single dye molecule coherently attenuates or amplifies a tightly focused laser beam, depending on the power of a second 'gating' beam.
A single molecule, represented here as a rotating mirror, can in principle behave as an all-optical transistor — it can modulate the transmission of a beam of light (the source beam, blue) in response to another beam of light (the gate beam, red). The waist-shaped surface represents a beam of light, focused on the molecule. The diagrams under each of the transistors represent the electronic energy levels of the molecule. a, If the molecule is in its ground state (g) and the source photons are equivalent in energy to the electronic energy transition from g to an excited state (e), then the source photons are resonantly scattered (totally reflected) as electrons oscillate between the e and g states. b, A gate photon of appropriate energy (different from that of the source photons) excites the molecule to a long-lived excited state (s). c, The excited molecule no longer absorbs source photons, which are instead perfectly transmitted. Hwang et al.3 report the first all-optical transistor that works on similar principles.
Lasers Can Create Temporal Lens of Attosecond Electron Pulses for Molecular Movies
A team at the University of Nebraska-Lincoln has figured out a possible way to observe and record the behavior of matter at the molecular level. That ability could open the door to a wide range of applications in ultrafast electron microscopy used in a large array of scientific, medical and technological fields.
The "lenses" in question are not made of glass like those found in standard tabletop microscopes. They're created by laser beams that would keep pulses of electrons from dispersing and instead focus the electron packets on a target. The timescales required, however, are hardly imaginable on a human scale -- measured in femtoseconds (quadrillionths of a second) and attoseconds (quintillionths of a second).
The physicists modeled two types of lenses. One was a temporal "thin" lens created using one laser beam that could compress electron pulses to less than 10 femtoseconds. The second was a "thick" lens created using two counterpropagating laser beams that showed the potential of compressing electron pulses to reach focuses of attosecond duration.
Abstract from PNAS: Temporal lenses for attosecond and femtosecond electron pulses
10 page pdf of supplemental information.
University of Nebraska-Lincoln press release, that equates the short pulses to create clearer pictures of a baseball using a strobe.
The "lenses" in question are not made of glass like those found in standard tabletop microscopes. They're created by laser beams that would keep pulses of electrons from dispersing and instead focus the electron packets on a target. The timescales required, however, are hardly imaginable on a human scale -- measured in femtoseconds (quadrillionths of a second) and attoseconds (quintillionths of a second).
The physicists modeled two types of lenses. One was a temporal "thin" lens created using one laser beam that could compress electron pulses to less than 10 femtoseconds. The second was a "thick" lens created using two counterpropagating laser beams that showed the potential of compressing electron pulses to reach focuses of attosecond duration.
Abstract from PNAS: Temporal lenses for attosecond and femtosecond electron pulses
Here, we describe the “temporal lens” concept that can be used for the focus and magnification of ultrashort electron packets in the time domain. The temporal lenses are created by appropriately synthesizing optical pulses that interact with electrons through the ponderomotive force. With such an arrangement, a temporal lens equation with a form identical to that of conventional light optics is derived. The analog of ray diagrams, but for electrons, are constructed to help the visualization of the process of compressing electron packets. It is shown that such temporal lenses not only compensate for electron pulse broadening due to velocity dispersion but also allow compression of the packets to durations much shorter than their initial widths. With these capabilities, ultrafast electron diffraction and microscopy can be extended to new domains,and, just as importantly, electron pulses can be delivered directly on an ultrafast techniques target specimen.
10 page pdf of supplemental information.
University of Nebraska-Lincoln press release, that equates the short pulses to create clearer pictures of a baseball using a strobe.
July 03, 2009
Carbon Nanotube Quantum Dot Terahertz Detectors and On-Chip High Resolution near-field terahertz detector
Two types of emerging terahertz detectors are based on novel nanoelectronic technologies. Future work to combine the two will enable a real time terahertz video camera.
1. A highly sensitive and frequency tunable terahertz detector based on a carbon nanotube (CNT) quantum dot (QD).
2. A near-field terahertz detector for high-resolution imaging.
Contrary to the situation in the microwave and visible-light region, the development of near-field imaging in the terahertz region has not been well established. Japan RIKEN has developed a new device for near-field terahertz imaging in which all components—an aperture, a probe, and a detector—are integrated on one gallium arsenide/aluminum gallium arsenide (GaAs/AlGaAs) chip. This scheme allows highly sensitive detection of the terahertz evanescent field alone, without requiring optical or mechanical alignment.
Two approaches can be used to achieve high spatial resolution in optical imaging: a solid immersion lens and near-field imaging. Though we have previously constructed a terahertz imaging setup based on a solid immersion lens, its resolution is restricted by the diffraction limit.3 A powerful method for overcoming the diffraction limit is the use of near-field imaging. This technique has been well established in visible and microwave regions using either a tapered, metal-coated optical fiber or a metal tip, and either a waveguide or a coaxial cable. However, the development of near-field imaging in the terahertz region has been hindered by the lack of terahertz fibers or other bulk terahertz-transparent media suitable for generating near-field waves, as well as the low sensitivity of commonly used detectors in the terahertz region.
In conventional near-field imaging systems, the propagation field arising from the scattering of the near-field (evanescent) wave is measured with a distant detector, which requires detecting very weak waves (and the influence of far-field waves is unavoidable). In contrast, our near-field terahertz imager places the aperture, probe, and detector in close proximity. The 8-µm-diameter aperture and planar probe, each of which is insulated by a 50-nm-thick silicon dioxide (SiO2) layer, are deposited on the surface of a GaAs/AlGaAs heterostructure chip.
An optical micrograph (left) and a schematic representation (right) shows the design of a highly sensitive on-chip near-field THz detector. The 8-µm-diameter aperture and planar metallic probe, each of which is insulated by a 50-nm-thick silicon dioxide (SiO2) layer, are deposited on the surface of a GaAs/AlGaAs heterostructure chip. (Courtesy of RIKEN)
Because integration with the CNT-QD detector requires improvements in the device fabrication process (specifically, by using higher-performance electron-beam lithography equipment), a two-dimensional electron gas (2DEG)—located only 60 nm below the chip surface—is used as the terahertz detector.
Why Terahertz Detection is Tough
The photon energy of the terahertz wave, on the order of millielectron volts (meV), is two to three magnitudes lower than that of the visible light, making the development of a high-performance terahertz detector a difficult task. Another problem with terahertz detection is low spatial resolution of terahertz imaging, which results from the longer wavelengths of terahertz radiation compared to that of visible light.
Work to Combine the Carbon Nanotube Quantum Dot Detector for Near Field Detection
1. A highly sensitive and frequency tunable terahertz detector based on a carbon nanotube (CNT) quantum dot (QD).
Observations have been made of electron tunneling via terahertz-photon detection, called photon-assisted tunneling. This result means that the CNT-QD structure can be utilized as a frequency tunable terahertz detector. CNT-QD detector functions properly up to approximately 7 K. Higher-temperature operation of the CNT-QD terahertz detector is also possible with more refined fabrication techniques.
The next important step is to improve detector performance in two important ways: sensitivity and frequency selectivity. A much more sensitive readout of the terahertz-detected signal could be achieved by capacitively coupling a CNT-QD with a quantum point contact device on a GaAs/AlGaAs heterostructure, which makes it possible to observe single-electron dynamics. And frequency selectivity could be improved by using a double-coupled CNT-QD, in which photon-assisted tunneling takes place as a result of electron transitions between two well-defined discrete levels.
2. A near-field terahertz detector for high-resolution imaging.
Contrary to the situation in the microwave and visible-light region, the development of near-field imaging in the terahertz region has not been well established. Japan RIKEN has developed a new device for near-field terahertz imaging in which all components—an aperture, a probe, and a detector—are integrated on one gallium arsenide/aluminum gallium arsenide (GaAs/AlGaAs) chip. This scheme allows highly sensitive detection of the terahertz evanescent field alone, without requiring optical or mechanical alignment.
Two approaches can be used to achieve high spatial resolution in optical imaging: a solid immersion lens and near-field imaging. Though we have previously constructed a terahertz imaging setup based on a solid immersion lens, its resolution is restricted by the diffraction limit.3 A powerful method for overcoming the diffraction limit is the use of near-field imaging. This technique has been well established in visible and microwave regions using either a tapered, metal-coated optical fiber or a metal tip, and either a waveguide or a coaxial cable. However, the development of near-field imaging in the terahertz region has been hindered by the lack of terahertz fibers or other bulk terahertz-transparent media suitable for generating near-field waves, as well as the low sensitivity of commonly used detectors in the terahertz region.
In conventional near-field imaging systems, the propagation field arising from the scattering of the near-field (evanescent) wave is measured with a distant detector, which requires detecting very weak waves (and the influence of far-field waves is unavoidable). In contrast, our near-field terahertz imager places the aperture, probe, and detector in close proximity. The 8-µm-diameter aperture and planar probe, each of which is insulated by a 50-nm-thick silicon dioxide (SiO2) layer, are deposited on the surface of a GaAs/AlGaAs heterostructure chip.
An optical micrograph (left) and a schematic representation (right) shows the design of a highly sensitive on-chip near-field THz detector. The 8-µm-diameter aperture and planar metallic probe, each of which is insulated by a 50-nm-thick silicon dioxide (SiO2) layer, are deposited on the surface of a GaAs/AlGaAs heterostructure chip. (Courtesy of RIKEN)
Because integration with the CNT-QD detector requires improvements in the device fabrication process (specifically, by using higher-performance electron-beam lithography equipment), a two-dimensional electron gas (2DEG)—located only 60 nm below the chip surface—is used as the terahertz detector.
Why Terahertz Detection is Tough
The photon energy of the terahertz wave, on the order of millielectron volts (meV), is two to three magnitudes lower than that of the visible light, making the development of a high-performance terahertz detector a difficult task. Another problem with terahertz detection is low spatial resolution of terahertz imaging, which results from the longer wavelengths of terahertz radiation compared to that of visible light.
Work to Combine the Carbon Nanotube Quantum Dot Detector for Near Field Detection
One of the challenges for future terahertz sensing technology is to achieve high detection sensitivity and high spatial resolution simultaneously. To realize this, we are now trying to combine the two techniques described above; namely to modify the CNT-QD terahertz detector into a similar structure for near-field detection. Compared to the 2DEG detector, the CNT detector exhibits much higher sensitivity and has a much smaller sensing area (approximately 200 nm compared to 8 µm for the 2DEG detector). This detector, integrated with an aperture and a probe, would show ultrahigh sensitivity and nanometer resolution simultaneously.
We further expect that when many CNTs are integrated in a two dimensional configuration, the resulting device will serve as a real-time, high-resolution terahertz imaging detector; in effect, a terahertz video camera.
DARPA Funds Phase 2 of Nano UAV Development - 10 gram Fake Hummingbirds
DARPA is providing following up funding to develop 10 gram UAVs (Nano Unmanned Aerial Vehicles- NAV) (4 page pdf) Phase 2 will end in the summer of 2010.
The U.S. Air Force is also funding a number of research projects in universities across the country. An Air Force Research Laboratory report, obtained by the Air Force Times and described in a recent article, suggests just where the Air Force wants to go with this research: The Air Force wants so-call Micro-Air Vehicles, or MAVs, about the size of a sparrow, ready to fly by 2015 and even smaller, dragonfly-sized drones ready to fly in swarms by 2030. Currently popular are Raven UAVs. They are about 4.5 feet across, weigh six pounds and can stay aloft for about an hour and a half.
The goals of the NAV program; namely to develop an approximately 10 gram aircraft that can hover for extended periods, can fly at forward speeds up to 10 meters per second, can withstand 2.5 meter per second wind gusts, can operate inside buildings, and have up to a kilometer command and control range; will stretch our understanding of flight at these small sizes and require novel technology development.
Nano air vehicles will be revolutionary in their ability to harness flapping wing, low Reynolds number physics, navigate in complex environments, and communicate over significant distances. Flight-enabling nano air vehicle system technologies being developed in the program include:
• Aerodynamic design tools to achieve high lift-to-drag airfoils;
• Lightweight, efficient propulsion and power subsystems; and
• Advanced manufacturing and innovative subsystem packaging and configuration layout.
The program will continue to develop conformal, multifunctional structural hardware and strong, light, robust aerodynamic lifting surfaces for efficient flight at low Reynolds numbers (<15,000). In addition, researchers will remain focused on developing advanced technologies that enable collision avoidance and navigation systems for use in GPS-denied indoor and outdoor environments as well as improving efficiency and stability in hovering flight and during the deployment or emplacement of sensors.
A micro aircraft(6 inches or less) in size and carrying all necessary systems on
board, such as energy sources and flight control sensors achieved 20 seconds of hovering in December of 2008.
The challenge of the Phase II effort will concentrate on optimizing the aircraft for longer flight endurances, transition capability from hover to forward flight and back, as well as reducing the size, weight, and acoustic signature. All of which are distinct technical challenges in their own right, that actually conflict with each other." Keennon elaborates. Dr. Hylton added, “There are still many hurdles to achieve the vehicle we envisioned when the program was started, but we believe that the progress to date puts us on the path to such a vehicle.”
July 02, 2009
New Nanomedicine Writing from Robert Freitas
Robert Freitas published a major new theory paper on aspects of medical nanorobot control, providing an early glimpse of future discussions of this topic that are planned to appear in Chapter 12 (Nanorobot Control) of Nanomedicine, Vol. IIB: Systems and Operations, the third volume of the Nanomedicine book series (still in preparation).
The paper is part of an edited book collection on bio-inspired nanoscale computing that was published about a week ago by Wiley.
Robert Freitas contributed the 15th chapter:
Robert A. Freitas Jr., “Chapter 15. Computational Tasks in Medical Nanorobotics,” in M.M. Eshaghian-Wilner, ed., Bio-inspired and Nano-scale Integrated Computing, John Wiley & Sons, New York, 2009, pp. 391-428.
The chapter is about 5.2 MB in size and a draft preprint version may be downloaded from the nanomedicine website: http://www.nanomedicine.com/Papers/NanorobotControl2009.pdf
Robert Freitas' nanomedicine books remain freely available online at http://www.nanomedicine.com, with links to MNT-based medical nanorobot designs at http://www.nanomedicine.com/index.htm#NanorobotAnalyses.
The paper is part of an edited book collection on bio-inspired nanoscale computing that was published about a week ago by Wiley.
Robert Freitas contributed the 15th chapter:
Robert A. Freitas Jr., “Chapter 15. Computational Tasks in Medical Nanorobotics,” in M.M. Eshaghian-Wilner, ed., Bio-inspired and Nano-scale Integrated Computing, John Wiley & Sons, New York, 2009, pp. 391-428.
The chapter is about 5.2 MB in size and a draft preprint version may be downloaded from the nanomedicine website: http://www.nanomedicine.com/Papers/NanorobotControl2009.pdf
Nanomedicine is the application of nanotechnology to medicine: the preservation
and improvement of human health, using molecular tools and molecular knowledge
of the human body. Medical nanorobotics is the most powerful form of
future nanomedicine technology. Nanorobots may be constructed of diamondoid
nanometer-scale parts and mechanical subsystems including onboard sensors,
motors, manipulators, power plants, and molecular computers. The presence of
onboard nanocomputers would allow in vivo medical nanorobots to perform
numerous complex behaviors which must be conditionally executed on at least a
semiautonomous basis, guided by receipt of local sensor data and constrained by
preprogrammed settings, activity scripts, and event clocking, and further limited
by a variety of simultaneously executing real-time control protocols. Such
nanorobots cannot yet be manufactured in 2007 but preliminary scaling studies
for several classes of medical nanorobots have been published in the literature.
These designs are reviewed with an emphasis on the basic computational tasks
required in each case, and a summation of the various major computational
control functions common to all complex medical nanorobots is extracted from
these design examples. Finally, we introduce the concept of nanorobot control
protocols which are required to ensure that each nanorobot fully completes its
intended mission accurately, safely, and in a timely manner according to plan. Six
major classes of nanorobot control protocols have been identified and include
operational, biocompatibility, theater, safety, security, and group protocols. Six
important subclasses of theater protocols include locational, functional, situational, phenotypic, temporal, and identity control protocols.
Robert Freitas' nanomedicine books remain freely available online at http://www.nanomedicine.com, with links to MNT-based medical nanorobot designs at http://www.nanomedicine.com/index.htm#NanorobotAnalyses.
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