Consortium of Indian Defence Websites
https://forums.bharat-rakshak.com/
very useful for our mil as wellhttp://blogs.zdnet.com/BTL/?p=31531&tag=nl.e539 Called a nanophotonic avalanche photodetector, the device is the fastest of its kind and has “significant implications” for the future of electronics, IBM says.
Ramana Sir,ramana wrote:Even though the story is about green technology can India use the Hydroform technology and add cement to help improve the infrastructre in the rural areas?
Madonna builds schools in Malawi with green tech
Any civil engineers on the board?
Actually, given the increasing presence of security cameras for public security, I'd wonder if 3D stereo camera technology could offer useful advantages for security purposes, since it might help to better discern objects in its field of view. The extra information provided by the 3D stereo imaging could perhaps prove to be valuable. Any opinions on this?
Sharp's new 3D camera module. Credit: Sharp.
Sharp Corporation announced yesterday that it has developed a module for smart phones and other devices that can capture high-definition 3D images. The module combine views from two cameras to create an image, automatically correcting differences in color, brightness and positioning.
The company says the camera module can be embedded in digital cameras, smart phones and other devices. While Sharp hasn't announced a price for the module, it will begin shipping sample modules to manufacturers in July. It plans to start mass production sometime later this year.
Sharp is one of many companies pushing 3D. Last month it announced that it would sell 3D LCD television--joining a host of other companies releasing 3D equipment.
The latest developments on thiskrisna wrote:http://satyameva-jayate.org/2010/03/04/lavan-vajra/
Quote:
…Dr Raja Marathe, IIT Bombay alumni and a former Naxal leader who returned to India from the United States a few years ago, may as well be known as Nanded’s rainman. Armed with burning tyres packed with salt, Marathe has single-handedly floated his own rain seeding project in the villages of Nanded (constituency of CM Ashok Chavan) called Lavan Vajra that has now been sanctioned by the collector of the district
video presentation at innovations 2010
http://live.kpoint.in/kapsule/gcc-71c9d ... 5086e96139#
Want to revolutionize the electronics industry, become a multimillionaire, and earn your place as an immortal in the tech pantheon? Your job is simple: Figure out a cost-effective way to make really good, reasonably large crystals of pure gallium nitride.
With such crystals as the foundation for the growth of devices made of the same material, manufacturers would have a far richer yield of the violet lasers on which the optoelectronics industry increasingly depends. For example, the short wavelengths of these lasers are needed to read the hyperfine, data-rich line that rings the discs in Blu-ray players and in the latest game machines. Better gallium nitride would also let automakers make the power-handling circuitry in their hybrid electric vehicles more efficient, improving mileage and possibly even affordability. And with a fabulously good crystal foundation, LEDs could perform better, speeding the demise of the century-old incandescent bulb.
So far, though, gallium nitride crystals of good size and archangelic purity have been beyond the grasp of all but one of the companies that have worked for years to create them. That company’s based not in Japan, Korea, or even the United States, but in Poland. Meet Ammono, the greatest success story in materials science you’ve never heard of.
The company got where it is today by bucking the common wisdom in the industry. Instead of growing crystals with vapor deposition, the approach that all the leading gallium nitride substrate manufacturers take, it grows them the way the Earth does: under high heat and pressure.
vijayk wrote:http://spectrum.ieee.org/semiconductors ... um-nitride
THE CRYSTAL THAT WILL CHANGE EVERYTHING: The World's Best Gallium Nitride
In any case the news is significant enough and it is being reported in more visible and popular media.. (and a few e-mail lists)The surface resistance of the silver-coated samples also shows a sharp change near 313 K. The results are strongly suggestive of a superconductive interfacial layer, and have been interpreted in the framework of Bose-Einstein condensation of bipolarons as the suggested mechanism for high-temperature superconductivity in cuprates...
[or]
..The experimental results reported here strongly suggest the presence of a superconducting layer near room temperature in the interface between a metal film and a PZT substrate. The data have been interpreted in the framework of the above model..[
US-based Indian origin researcher Shuvo Roy has created the world's first implantable artificial kidney. What's sensational about Roy's creation is that the organ, no larger than a coffee cup, will be able to mimic the kidney's most vital functions like filtering toxins out of the bloodstream, regulate blood pressure and produce the all- important vitamin D.
The artificial kidney has been tested successfully on a small number of animals. Large-scale trials on animals and humans are expected over the next five years. Once available, and if affordable, this creation by the Roy-led team at University of California will do away with the need for kidney dialysis.
This will be a boon for all patients with chronic kidney disease (CKD). At present in India, of the 1.5 lakh new patients who suffer from end-stage renal failure annually, only 3,500 get kidney transplants and 6,000-10,000 undergo dialysis. The rest perish due to an acute shortage of dialysis centres and nephrologists to man them.
Alexie Kolpak and Jeffrey Grossman from the Massachusetts Institute of Technology propose a new type of solar thermal fuel that would be affordable, rechargeable, thermally stable, and more energy-dense than lithium-ion batteries. Their proposed design combines an organic photoactive molecule, azobenzene, with the ever-popular carbon nanotube.
Before we get into the details of their proposal, we’ll quickly go over how photoactive molecules store solar energy. When a photoactive molecule absorbs sunlight, it undergoes a conformational change, moving from the ground energy state into a higher energy state. The higher energy state is metastable (stable for the moment, but highly susceptible to energy loss), so a trigger—voltage, heat, light, etc.—will cause the molecule to fall back to the ground state. The energy difference between the higher energy state and the ground state (termed ΔH) is then discharged. A useful photoactive molecule will be able to go through numerous cycles of charging and discharging.
The challenge in making a solar thermal fuel is finding a material that will have both a large ΔH and large activation energy. The two factors are not always compatible. To have a large ΔH, you want a big energy difference between the ground and higher energy state. But you don’t want the higher energy state to be too energetic, as it would be unstable. Instability means that the fuel will have a small activation energy and be prone to discharging its stored energy too easily.
Kolpak and Grossman managed to find the right balance between ΔH and activation energy when they examined computational models of azobenzene (azo) bound to carbon nanotubes (CNT) in azo/CNT nanostructures. According to their calculations, placing azobenzene on carbon nanotubes will stabilize both the ground and higher energy states. There is a decent energy gap between the two states, meaning a good ΔH. Second, stabilizing the higher energy state means that the activation energy is large enough to give the photo-excited azo/CNT material a relatively long half life (over one year).
