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Tuesday, January 3, 2012

Chasing the Elusive Energy Policy



Strong energy policy is needed now more than ever, but the chances that Congress will pass one in 2012 are slim.
KEVIN BULLIS 
Prospects for passing some sort of long-term energy policy were good just two years ago, but a lousy economy and some aggressive lobbying by opponents of climate change policy derailed those efforts, and there's no reason to think things will get back on track in 2012.
The closest possibility may be clean energy standards legislation being crafted by Jeff Bingaman, a Democratic senator from New Mexico. But Republicans have already lined up against such a measure, and even existing clean energy policies are being questioned, especially after the failure of the solar cell maker and loan guarantee recipient Solyndra. (See "Solyndra: We Told You So.") Election year politics may force legislators to steer clear of hot button issues like climate change.
In the absence of a comprehensive energy policy, expect increased use of natural gas, which is cheap because of large newly economical resources in the United States, and decreased use of coal, which is the subject of new EPA regulations. Without policy support, or sudden, big improvements to battery technology, it's hard to see electric vehicles taking off quickly, and as the cellulosic ethanol industry has been slow to get going, don't expect biofuels to make a big dent in gasoline consumption. Indeed, the country may grow yet more dependent on oil as large new resources are exploited in places such as North Dakota and Texas, and friendly neighbors such as Canada. Some experts are starting to suggest that within a decade or two, the Americas would no longer need to import any oil. That might sound good, but oil prices will still depend on the worldwide market for oil—as long as demand is growing as it has been in recent years, prices will stay high, and volatile, even if the U.S. starts sending more money to Brazil and Canada and less to the Middle East.
Looking ahead, we can also expect to see more failures in the solar industry, as low prices force many out of business. One thing that will be interesting to watch is the extent to which the survivors manage to succeed, even in a climate of reduced government incentives. The U.S.-based solar panel manufacturing giant First Solar recently announced that it plans to stop targeting fickle subsidized markets, and instead sell to places where its technology makes economic sense on its own merits. Prices for solar panels may have decreased enough in recent years that the industry can survive on its own--serving areas with lots of sun and high electricity prices—albeit at a smaller size than it could with government support.

New Manufacturing Tech Could Mean Cheaper Solar Cells


Solar machine: The CEO of Natcore Technology demonstrates a prototype AR-Box, which uses a new liquid-based deposition technology to apply antireflective coatings.

ENERGY

New Manufacturing Tech Could Mean Cheaper Solar Cells

Startup Natcore says its process could reduce costs and enable new nanostructured designs.

  • BY KEVIN BULLIS
A novel way to make thin, uniform coatings developed at Rice University could reduce the cost of making conventional silicon solar cells, and could open the way for new kinds of solar cells that are far more efficient or cheaper than conventional ones.
The technology, which deposits coatings in a low-temperature, liquid-based process rather than the high-temperature gas-based process used now, is being commercialized by Natcore Technology, a startup in Red Bank, New Jersey. The company plans to use the technology to replace a standard step in conventional solar cell manufacturing—adding an antireflective coating to silicon wafers to help them to absorb more light. It will also offer a more advanced antireflection technology, called black silicon.
At the same time, Natcore is developing more advanced applications of the process, including fabricating solar cells made of carbon nanotubes or nanoscale crystals called quantum dots. Such solar cells will probably take years to commercialize, but could far outperform conventional solar cells. Nano solar cells have been attempted before, but the company thinks its new manufacturing technology could make them affordable.
As a replacement for high-temperature processes on a conventional manufacturing line, the liquid-based process can lower manufacturing costs. Natcore's CEO, Charles Provini, estimates that replacing a conventional coating machine with one of his company's could save a solar manufacturer about $1 million in electricity costs per year.

Manufacturers don't currently use liquid-based processes for antireflection coatings in part because it's been difficult to make the coating uniform enough for solar cells. The problem arises from the way a liquid process typically works. The coating forms as reactants in the liquid interact with a surface. As the reactants are used up, the rates of deposition change, resulting in variations in the thickness of the coating. Researchers at Rice addressed this problem by developing a system for continuously replenishing the reactants while also closely monitoring the thickness of the films.
One of Natcore's advanced nano solar cell designs involves depositing layers of quantum dots on a silicon solar cell. The quantum dots are designed to absorb colors that silicon doesn't, potentially doubling the efficiency of solar cells. This has been tried before, but forming a layer of quantum dots has required expensive processing technology, and it has proven difficult to space the quantum dots to avoid unwanted electrical discharges between them. The Natcore process is inexpensive, and it provides a means for controlling the arrangement of the quantum dots by coating them with a layer of silicon dioxide that acts as a spacer. The company has decided to start by coating conventional silicon solar cells to make it easier for the industry to adopt the technology, but could eventually do away with silicon wafers for an entirely quantum-dot-based solar cell that uses more than one type of quantum dot to efficiently absorb the entire range of wavelengths in sunlight.
Another design, which Natcore is developing together with Kodak, involves using the liquid deposition process to coat a network of carbon nanotubes with a solar semiconductor material to produce thin, flexible solar cells. Natcore says solar cells using this design could be about as efficient as conventional silicon solar cells, but cost roughly half as much to make, in large part because they could be made with the same equipment that Kodak has used to make photographic film. Because the solar cells would be light and flexible, they would also be easier to install, cutting installation costs in half, Natcore estimates.
Andrew Barron, the professor of chemistry and materials science at Rice University who developed the liquid deposition technology, says the carbon nanotube design is closer to commercialization than the quantum dot one. He says researchers have made small prototype solar cells—the remaining development work has to do with working out the details of manufacturing. The quantum dot solar cells are still at an early stage—the researchers have only so far used the liquid process to show that it's possible to distribute the quantum dots as needed. They haven't built solar cells yet.
Natcore has raised about $6 million through a public offering on a Canadian stock exchange. It has also signed joint venture agreements with companies in China and Italy. The company plans to license its technology to others, rather than manufacture solar cells itself. It is currently testing a prototype version of a commercial-scale liquid deposition machine, and Provini says the company has four solar cell manufacturers lined up to buy the commercial version of the machine, if the company meets certain technical milestones.

New Material Cools Under Pressure




Science Daily — Research led by a team from the University of Barcelona, published in the online version of the journal Nature Communications, has identified a new material that exhibits an inverse barocaloric effect at room temperature, which means that it cools when pressure is applied, unlike most other materials. The study carried out within the Barcelona Knowledge Campus (BKC) framework, also included work by researchers from the Polytechnic University of Catalonia. BarcelonaTech (UPC), the University of Duisburg-Essen (Germany) and the Indian Association for the Cultivation of Science.

During the study, the Group on Characterization of Materials at the Polytechnic University of Catalonia. BarcelonaTech (UPC) characterized the processes by which the solid material was submitted at different temperatures and pressures using a custom system developed by the team.The barocaloric effect refers to the change in temperature produced in a material by the application of hydrostatic pressure. Most objects heat up when compressed and cool down when decompressed. Still, some solids display the opposite behaviour: their temperature decreases when they are compressed and increases when they are decompressed. Lluís Mañosa, UB professor, explains: "This highly unusual behaviour is what we have termed the inverse barocaloric effect. In our study we have found a material which exhibits a substantial change at moderate pressures: its temperature drops by 1ºC for each additional 1 kbar of pressure."
The material developed during the study is an intermetallic compound of the magnetocaloric metals lanthanum, iron, silicon and cobalt (La-Fe-Si-Co), which change temperature when an external magnetic field is applied. This material group is considered the most promising for novel refrigeration systems. According to Mañosa, "in the material we studied, the temperature change brought about by moderate pressures is of sufficient magnitude to be considered for use in environmentally respectful refrigeration systems. In addition, the fact that it responds to two types of external stimulus -- magnetic fields and pressure -- would allow for the design of devices that apply these stimuli simultaneously to obtain higher levels of performance."
The inverse barocaloric effect is created by a phase transition in the material below a given temperature, leading to structural and magnetic changes. It has recently been suggested that materials displaying this behaviour could also be used in novel energy harvesting systems.

Scientists Map Susceptibility to Type 2 Diabetes



Science Daily  — Research carried out at the Hebrew University of Jerusalem has provided the first proof of molecular risk factors leading to type 2 diabetes, providing an "early warning" sign that could lead to new approaches to treating this and other human disease conditions.

Despite extensive research on the molecular basis for the variance in susceptibility between individuals to common diseases, the subject is still poorly understood. A prime example of this is type 2 diabetes (T2D), a very widespread human disorder.
What is it that characterizes the susceptibility to this disease?
Epigenetic variations -- which are small molecular marks superimposed on the DNA structure -- have been frequently hypothesized to modify predisposition, but direct evidence was missing.
Now, a research team led by Dr. Asaf Hellman of the Hebrew University's Institute of Medical Research Israel Canada has developed a novel, multistep, study design involving the analysis of disease-contributing epigenetic variations among hundreds of patients and control individuals.
The research was presented in a scientific conference at the Cambridge University Genomic Center and was recently published in the scientific journal Human Molecular Genetic.
Taking an innovative research direction, the Hebrew University research team decided to map DNA methylation variations rather than DNA sequence variations, as was traditionally done. The team undertook a proof-of-concept study among 1,169 type 2 diabetes patients and non-diabetic controls. The results demonstrated the unique abilities of this novel research approach by revealing a clear-cut, disease-predisposing DNA methylation signature. This is a first report in the scientific literature of epigenetic risk factor for T2D.
DNA methylation is a naturally occurring mechanism used to regulate genes and protect DNA from some types of cleavage. It is one of the regulatory processes that are referred to as epigenetic, in which an alteration in gene expression occurs without a change in the nucleotide sequence of the DNA. Defects in this process cause several types of disease that afflict humans.
The method used by Hellman was developed during postdoctoral training at the Harvard University Medical School. Later, his research students at the Hebrew University, Gidon Tperoff and Dvir Aran, further developed it into an efficient, genome-wide mapping method.
The mapping was carried out on the methylation sites in cooperation with Prof. Benjamin Glaser, head of the Endocrinology and Metabolism Department at the Hebrew University-Hadassah Medical School and a leading researcher of T2D genetics, and with additional key researchers including Professors Jeremy Kark and Yechiel Friedlander from the Braun Hebrew University-Hadassah School of Public Health and Community Medicine, Prof. Julio Wainstein from the Wolfson Medical Center, and Prof. Ephrat Levy-Lahad from the Shaare Zedek Medical Center.
This analysis not only revealed, for the first time, a clear-cut epigenetic signature in T2D, telltale methylation signature marks were also shown to appear on the DNA of young individuals who latter developed impaired glucose metabolism, even before the appearance of clinical diabetic manifestations.
These findings shed new light on the mechanism of individual predisposition to T2D and pave the way for the elucidating of similar mechanisms in a long list of common human diseases, including many metabolic, autoimmune and psychiatric disorders.
Given that epigenetic marks are sensitive to a wide range of environmental clues, including diets, chemical exposures, intrauterine environments, and also to therapeutic drugs, these finding may open the way for the development of new prevention and/or intervention epigenetic therapies.

You Built What?! A Wearable LED Television



This 160-by-120 pixel TV will get you stopped at the airport
Colour by Numbers David Forbes's TV vest contains 14,400 green, red, and blue LEDs that together make 4,667 pixels. Steven Meckler
David Forbes was on his way home to Tucson, Arizona, after a family trip last summer when a policeman stopped him in the Detroit airport. The officer said he had received 50 panicked phone calls since Forbes had entered the building, and now his entire family had been marked for extra screening. The delay was inconvenient, but it shouldn’t have come as a surprise. Forbes had 160 circuit boards and enough electronics to start a data center strapped to his body. What the authorities didn’t realize, though, was that all the equipment wasn’t dangerous—it was actually a wearable TV set.
An electrical engineer, Forbes built his first video coat in 2009 after getting his hands on a collection of surplus LED displays. He transformed them into “the world’s worst television,” an all-red screen that weighed 50 pounds. He wanted to make a better, lighter version, and thanks to a side business selling homemade wristwatches, he had the spare cash. He laid an old overcoat on a table, measured its dimensions, and guessed that he could fit it with enough LEDs to create a sharp 160-by-120-pixel display. Next, he sorted through his gadget box and found a few flexible circuit boards. The flexibility was ideal for a wearable screen, but he wanted to have more pixels, so he built a prototype of a long, thin board with 30 rows of four LEDs each and shipped it to a circuit board manufacturer to make 175 more.
Screen Shot: When the vest is displaying video, roughly five gigabits of data flows to the LEDs every second.  Steven Meckler
Forbes also built an additional circuit board to scale down the analogue video signal from his iPod and three other circuit boards that translate the signals into instructions for the LEDs and deliver power from two lithium-polymer batteries. He put the batteries into his pants pockets and hot-glued the control boards to the shoulders and the flexible display boards to the front and back of the coat. A little Velcro down the middle replaced the buttons on the coat. The finished version weighed only eight pounds.
Forbes convinced airport security that he wasn’t a threat at the airport by offering to show them The Simpsons on the coat. Since then, he has cut the coat into two less-cumbersome vests. Although they’re relatively comfortable and they work well, they haven’t replaced his family TV. “I’m not using them daily,” he says, “but they get taken out now and then if I’m in the mood for a little attention from strangers.”
Image Generation: The iPod connects to a circuit board that has a chip normally used to scale down the pixels in surveillance video.  Steven Meckler

How It Works

Time: 6 months
Cost: $20,000

DISPLAY

Forbes’s iPod plugs into a circuit board on the vest’s left shoulder. The board includes a digitizing chip—a type used in security video systems that allows the feeds from four cameras to fit on one monitor—that he repurposed to scale iPod video down to a resolution consistent with his display. Additional processing converts the iPod data into signals for the LEDs, which travel along Ethernet-like cables to four separate boards, one on each shoulder and hip. From there, the signals move through ribbon cables to the three miniature chips on each of the flexible circuit boards located on the chest and back. The chips turn the LEDs on and off 360 times a second to create the illusion of changing color and brightness.

POWER

Heavy batteries would make the coat hard to wear, so Forbes found an R/C hobby shop in Washington that sold lightweight, inexpensive lithium-polymer batteries. One battery fit in each pocket, which gave the coat roughly an hour of run-time. The smaller vests last up to 90 minutes.

AUDIO

Forbes initially thought about rigging small speakers to the shoulders of the coat, but he realized that they wouldn’t be powerful enough to let him show off his invention at Burning Man, the annual festival in the Nevada desert. So he wired the coat to another one of his inventions, a boom box for bicycles that he built from a six-inch-diameter drain pipe and a pair of outdoor marine speakers.

Wilton B.A.S.H. Sledgehammer and Two-Faced Crowbar


Can anything break a steel-reinforced sledge?
Strong Hold B.A.S.H. is the only sledge to thread the handle through the head. Typical sledges rely on friction to hold the two together. Claire Benoist
Sledgehammers are the monsters of demolition. They can deliver enough force to pound boulders into dust, but strangely, it doesn’t take much to break them in two. When workers miss their target and whack the hammer’s handle on debris, called overstriking, the hammerhead can snap off, becoming a dangerous projectile. Wilton guarantees its Bad Ass Sledge Hammers (B.A.S.H.) against breaks, and will cut a $1,000 check to anyone who can destroy one. Depending on the model, up to six steel rods run the length of the handle and affix to a plate inside the head, holding the two parts together. When the hammerhead strikes, the rubber handle disperses the force evenly among the rods, a design that also absorbs vibration.

THE TEST

Knowing that the B.A.S.H. was likely to withstand regular abuse—hours of pounding on concrete and snapping steel joints—I focused on striking its most vulnerable spot: the upper handle. I repeatedly overstruck the hammer on a one-inch-thick steel rod suspended between two-by-fours. After that, I overstruck on a four-inch-square fencepost that I was driving into the ground.

THE RESULTS

After maybe 1,000 whacks, the B.A.S.H. held strong. In fact, the test was a bit demoralizing—my back felt more worn than the hammer looked. It barely seemed used. The handle flexed gently on impact but never showed any sign of fracture. And the B.A.S.H. is one of the most comfortable sledges I’ve ever swung; the handle absorbs so much vibration that overstriking felt more like hammering a nail than clobbering steel.
Swinging Weight: 2.5-20 pounds
Handle Length: 12-36 inches
Price: $38-$160

The Two-Faced Crowbar

FUBAR:  Stanley

With its new FuBar, Stanley multiplies the demolition capability of a normal crowbar, replacing what would be a blunt handle with a heavy-duty slicer. On top, the chiseled end of the 14-inch steel-and-carbon bar is thick enough to break holes in drywall. On the bottom, it’s ground down to a fine edge that can slice through material with a couple of hammer taps to the bar. Stanley FuBar Demolition Bar $20

நம்பிக்கை இல்லாதவரும் கடவுளை காணலாம்...!








   பிரணாயாமம் என்ற மூச்சு பயிற்சி ஆரோக்கியமான வாழ்கைக்கு சிறந்தது என்று கேள்விப்படுகிறோம்

 அதை செய்யும் முறையை குரு மூலம் தான் அறிய வேண்டும் என்பதும் நமக்கு தெரியும்

அந்த பயிற்சியை செய்ய துவங்கும் முன் அதை எப்போது செய்ய வேண்டும் அதற்கான உணவு கட்டுப்பாடு ஏதேனும் உண்டா என்பதை அறிந்து கொண்டால் நம்மால் ஆகுமா ஆகாதா என்று முடிவு செய்யலாம் என சிலர் நினைக்கிறார்கள்

மூச்சு பயிற்சி என்பது ஆயுள் காலத்தை நீட்டிக்கும் ஒரு முயற்சி மட்டுமல்ல வாழும் காலம் எவ்வளவு ஆனாலும் அதில் ஆரோக்கியமாக இருக்கும் வழியேயாகும்.


  முறைப்படி மூச்சு பயிற்சியை காலை மாலை இரு வேளைகளில் தான் செய்ய வேண்டுமென யோக நூல்கள் சொல்லுகின்றன

  சூரிய உதய நேரத்திலும் மறையும் வேளையிலும் தரையில் பத்மாசனம் இட்டு அமர்ந்து முதுகு தண்டுவடம் நேராக நிற்பது போல் நிமிர்ந்து அமர வேண்டும்.

  புலித்தோல், மான்தோல் போன்ற விரிப்புகளை தான் பயன்படுத்த வேண்டும் என்பது கிடையாது.

  பருத்தி மற்றும் கம்பளி துணிகளையும் பயன்படுத்தலாம்.

 தர்ப்பையால் ஆன பாய் சிறந்தது ஆகும்.

 நாம் மூச்சு பயிற்சி செய்கின்ற அறையில் நமக்கு பிடித்தமான கடவுள் படங்களை வைத்து கொள்ளலாம். 
 கடவுள் நம்பிக்கை இல்லாவிட்டால் இயற்கை காட்சி படங்களை வைக்கலாம். இந்த பயிற்சி கடவுள் நம்பிக்கை இல்லாதவனை கூட கடவுளிடம் அழைத்து செல்லும்

 மிக முக்கியமாக அந்த அறை காற்றோட்ட வசதி உள்ளதாகவும், வெளிச்சம் வர கூடியதாகவும் சுத்தமாகவும் இருக்க வேண்டும்.


  ஊதுபத்தியோ அல்லது மற்ற வாசனை பொருட்களோ உபயோகப்படுத்த கூடாது.

 அந்த நேரத்தில் மனிதர்களின் நடமாட்டமும் செல்லப் பிராணிகளின் அருகாமையோ கூடாது.

 அதிகமா ஒளியும் அங்கு வர கூடாது.

  மனதை கூடியமானவரை அலைய விடாமல், கண்களை மென்மையாக மூடி நிதானமாக அவசரமே இல்லாமல் மூச்சு பயிற்சி செய்ய வேண்டும்.

  இதில் கவனத்தில் கொள்ள வேண்டியது நேற்று ஒரு நேரம் இன்று ஒரு நேரம் என நமது விருப்பப்படி பிராணாயாமம் செய்யும் நேரத்தை வைத்துக் கொள்ள கூடாது.

  தினசரி மிக கண்டிப்பாக ஒரு குறிப்பிட்ட நேரத்தை கடைபிடிக்க வேண்டும்.

  சத்தமாக பேசுதல் வன்மையான வார்த்தைகளை பயன்படுத்துதல் கூடாது.

 கூடியமான வரை மனதை காம வசப்படாமல் பார்த்து கொள்ள வேண்டும்.

 பச்சரிசி அல்லது புழுங்கல் அரிசி சாதத்துடன் சிறிது நெய், பருப்பு கலந்த உணவை அரை வயிற்றுக்கு எடுத்து கொள்ள வேண்டும்.

 கால் வயிற்றுக்கு நீரும், மீதம் வயிறு காற்றாலும் நிரம்பியிருக்க வேண்டும். 

உணவு சாப்பிட்ட சிறிது நேரம் கழித்து வாழை பழம் மாம்பழம், ஆரஞ்சு பழம், சீத்தா பழம் ஆகிய பழங்களில் எதாவது ஒன்றை கண்டிப்பாக சாப்பிட வேண்டும்.

  வயிறு நிறைவாக இருக்கும் போதோ, பசியோடு இருக்கும்  போதோ மூச்சு பயிற்சி செய்யக் கூடாது.

  மல ஜலம் கழித்த பிறகு குளித்து முடித்தே இந்த பயிற்சியை மேற்கொள்ள வேண்டும்.

 இப்படி செய்பவர்கள் இடத்தில் பெரிய நோய்கள் எதுவும் வராது.