Hybrid fiber optic cable carries data and power

Posted: 4th February 2012 by Noman Shah in Information Technology
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When you want to isolate communications between two devices or locations, a fiber optic link is one of the best ways to go. Under some circumstances, however, you might also want to isolate the transmission of power – in situations where traditional copper wire might prove unsafe or impractical, for instance. That’s why researchers at Sandia National Laboratories are developing a power-over-fiber (PoF) communications cable. It carries not only data, but also optical power.

Invented by Sandia’s Titus Appel and Steve Sanderson, PoF is currently limited to a fairly low capacity, so don’t expect it to be delivering power to your house any time soon. It could, however, supply power to small electrical devices such as sensors, for which it would also be providing data transfer.

In the cable’s present incarnation, optical power goes through a single glass fiber. A laser diode at one end of that fiber emits light, while a miniaturized photovoltaic cell at the other end converts it into electricity. Power is only delivered on demand, in order to save energy.

Data is carried by plastic optical fibers, connected to stacked circular circuit boards with LEDs, mounted in the backshell connector housings at either end of the cable. The next version of the PoF will use less-bulky glass fibers for both power and communications. It should also have the ability to provide power to outside devices, whereas the present prototype uses the optical power solely to run its own communications electronics.

So, where would such a cable find use? Appel and Sanderson believe it would be useful in applications relating to safety, such as security, explosives, explosion-proof devices, aviation and medical devices. “The key issue here is to maintain total electrical isolation from any stray electrical energy and high-voltage electrical surges caused by such things as lightning strikes,” said Sanderson.

The team have already tested a PoF-based low-energy detonator firing cable, which carries data regarding detonator resistance, temperature and charging voltages, while also delivering power to the detonator. They are now working on reducing the size, weight and cost of the technology, and making it rugged enough to stand up to everyday use.

http://www.gizmag.com/hybrid-data-power-optical-cable/21335/

Buhel Speakgoggle lets you talk through your nose bones

Posted: 4th February 2012 by Noman Shah in Health
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Traditionally just big, goofy optics designed to protect your eyes from cold, snow and bright light, ski goggles have taken all kinds of new roles over the past few winters. Some goggles track your speed and vertical and some capture video. The Buhel Speakgoggle provides a seamless, vibration-based communications mechanism to keep you in touch with your crew.

Cell phones are both a boon and a bane to skiers and snowboarders. Boon: They help riders stay in touch with their group in a sport where it’s easy to lose track of one another. Bane: They are difficult to find and operate with gloves, jacket pockets, helmets, hats, etc.

The Buhel Speakgoggle G33 Intercom is designed to streamline cell phone communications on the hill. The goggles use Bluetooth to connect to your cell phone, music player or other Bluetooth device. The microphone is actually integrated into the goggle frame itself and uses bone conduction – essentially vibrations sent through your facial bones – to pick up your speech. This type of communication helps eliminate background noise and provide for clear communications.

To listen, you connect your earphones directly into the goggle rather than running them to the device in your pocket, so there’s less wire to worry about. The goggles automatically answer incoming calls, pausing your song if you’re listening to music. The buttons on the sides of the goggle frame let you control your functions, and they appear large enough to operate with gloves on.

If you prefer to listen without earphones, Buhel also makes Soundglasses, which are sunglasses that have integrated wireless speakers and microphone.

In addition to its Bluetooth capabilities, the Speakgoggle can pair with other Speakgoggles to provide intercom communications at distances up to 500 meters (1,640 feet). You can mate your goggles to six other pairs and communicate directly with each other.

Outside of its technological capabilities, the Speakgoggle offers a helmet-compatible interface with anti-scratch, anti-fog lenses.

You’ll find more information about the goggles and distribution at Buhel’s website. The video is more like an advertisement, but shows a little more of the goggles in action.

http://www.gizmag.com/ski-goggles-bluetooth-intercom/21238/

IBM’s Top 5 Technology Predictions for the Next 5 Years

Posted: 22nd December 2011 by Noman Shah in Research
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Who would have guessed, five years ago, that by 2011 we would have mobile phones that would, in a rudimentary way, listen to our questions and give us useful answers? Or ways for doctors to get help to people in the most remote corners of the world?

Crystal-ball forecasts, fanciful or otherwise, are a staple of year-end conversations, but IBM, the computer-services giant, has a research arm that makes them as a matter of course. Every December, it puts out a “5 in 5″ list — five predictions for the next five years. The company says it is a way to solve major societal problems, identify business opportunities, and, while they’re at it, get people talking.

“It’s a very good test of our ability to see forward in a holistic way,” said Bernard Meyerson, IBM’s vice president of innovation, who talked about how engineers, economists, marketers and others may all be involved in a multi-billion-dollar project. “You cannot survive long-term if you just concentrate on just one part of a problem. You’ll get run over.”

How good have their past predictions been? IBM says two of its five predictions from five years ago — telemedicine and nanotechnology for environmental needs — panned out, others less so (you still drive your car the same way, for instance).

“Not everything will work,” said Meyerson, “but you’ll be astounded how well you do if you work at it.”

Keeping score, though, is a little beside the point; setting goals for the future is more like it. So here is IBM’s list of “the next 5 in 5.”

Energy: People Power

Imagine generating electricity from routine motions around you — using the tides to run power plants, or charging your cellphone battery by plugging it into a tiny generator attached to a wheel of your bicycle. It’s kinetic energy. Remember that from third-grade science?

These are not that hard to do. We’re not doing them. They could relieve the load on our overburdened power grid, reduce pollution and make power blackouts less of a worry.

Security: The End of Passwords

You need one password for your cellphone, another for your checking account, a different one for your email at work and at home — and another for your list of passwords. Enough! A good hacker can go around them anyhow.

This is not really about passwords, says IBM, it’s about personal security. Meyerson talks about “multifactor biometrics” as your way to prove to your digital tools that you’re really you.

They’re thinking of retinal scans, voice print identification, fingerprints and the like, used in combination. Much better than your dog’s name followed by a number.

Meyerson says this could be liberating. You could be much more comfortable about storing vital information in a handheld or a tablet. The device becomes more useful to you — and completely worthless to a would-be thief.

Reading Your Mind

We live in a primitive world. If you want a machine to do something, you press buttons or turn knobs. In a few limited cases (“What’s your account number?” says the automated voice on the phone), it may understand your voice.

Every time you think about pushing one of those buttons, though, you think about it — and perhaps the minute electrical impulses in your brain can be read.

Primitive versions have already been used to help people with disabilities. The technology could be made cheaper and more common. Want to talk to your brother? Think about it and your phone will call him.

Who would have guessed, five years ago, that by 2011 we would have mobile phones that would, in a rudimentary way, listen to our questions and give us useful answers? Or ways for doctors to get help to people in the most remote corners of the world?

Crystal-ball forecasts, fanciful or otherwise, are a staple of year-end conversations, but IBM, the computer-services giant, has a research arm that makes them as a matter of course. Every December, it puts out a “5 in 5″ list — five predictions for the next five years. The company says it is a way to solve major societal problems, identify business opportunities, and, while they’re at it, get people talking.

“It’s a very good test of our ability to see forward in a holistic way,” said Bernard Meyerson, IBM’s vice president of innovation, who talked about how engineers, economists, marketers and others may all be involved in a multi-billion-dollar project. “You cannot survive long-term if you just concentrate on just one part of a problem. You’ll get run over.”

How good have their past predictions been? IBM says two of its five predictions from five years ago — telemedicine and nanotechnology for environmental needs — panned out, others less so (you still drive your car the same way, for instance).

“Not everything will work,” said Meyerson, “but you’ll be astounded how well you do if you work at it.”

Keeping score, though, is a little beside the point; setting goals for the future is more like it. So here is IBM’s list of “the next 5 in 5.”

Energy: People Power

Imagine generating electricity from routine motions around you — using the tides to run power plants, or charging your cellphone battery by plugging it into a tiny generator attached to a wheel of your bicycle. It’s kinetic energy. Remember that from third-grade science?

These are not that hard to do. We’re not doing them. They could relieve the load on our overburdened power grid, reduce pollution and make power blackouts less of a worry.

Security: The End of Passwords

You need one password for your cellphone, another for your checking account, a different one for your email at work and at home — and another for your list of passwords. Enough! A good hacker can go around them anyhow.

This is not really about passwords, says IBM, it’s about personal security. Meyerson talks about “multifactor biometrics” as your way to prove to your digital tools that you’re really you.

They’re thinking of retinal scans, voice print identification, fingerprints and the like, used in combination. Much better than your dog’s name followed by a number.

Meyerson says this could be liberating. You could be much more comfortable about storing vital information in a handheld or a tablet. The device becomes more useful to you — and completely worthless to a would-be thief.

Reading Your Mind

We live in a primitive world. If you want a machine to do something, you press buttons or turn knobs. In a few limited cases (“What’s your account number?” says the automated voice on the phone), it may understand your voice.

Every time you think about pushing one of those buttons, though, you think about it — and perhaps the minute electrical impulses in your brain can be read.

Primitive versions have already been used to help people with disabilities. The technology could be made cheaper and more common. Want to talk to your brother? Think about it and your phone will call him.

Ending the Digital Divide

Already, far more people get online through their cellphones than through plugged-in computers. Wireless access in countries like South Korea is considerably faster and more useful, says Paul Bloom of IBM, than it is in the U.S.

This could be expanded and be powerful. In a poor country, it is far easier and cheaper to set up wireless networks than it is to lay cables the old-fashioned way.

No More Junk Mail

Sure, the Postal Service is in trouble. People make online payments and send email instead of using the mail. Your mailbox instead overflows with flyers for things you could care less about. Your email is crowded with spam.

“But what if your handset learns your preferences?” asked Meyerson. “It’ll take care of the junk mail you don’t want.” If it figures out you’re a Greenday fan, for instance, it may already be letting you know when there are deals on tickets.

You may find this unsettling — the machines have you figured out — but Meyerson said you may like it. Advertisers will stop bothering you if they know they’re wasting their time.

“It inverts the entire relationship between the target and the marketer,” he said.

Ending the Digital Divide

Already, far more people get online through their cellphones than through plugged-in computers. Wireless access in countries like South Korea is considerably faster and more useful, says Paul Bloom of IBM, than it is in the U.S.

This could be expanded and be powerful. In a poor country, it is far easier and cheaper to set up wireless networks than it is to lay cables the old-fashioned way.

No More Junk Mail

Sure, the Postal Service is in trouble. People make online payments and send email instead of using the mail. Your mailbox instead overflows with flyers for things you could care less about. Your email is crowded with spam.

“But what if your handset learns your preferences?” asked Meyerson. “It’ll take care of the junk mail you don’t want.” If it figures out you’re a Greenday fan, for instance, it may already be letting you know when there are deals on tickets.

You may find this unsettling — the machines have you figured out — but Meyerson said you may like it. Advertisers will stop bothering you if they know they’re wasting their time.

“It inverts the entire relationship between the target and the marketer,” he said.

PTV Drama: Tanhaiyaan

Posted: 9th October 2011 by Noman Shah in Childhood TV Serials, Memories
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Tanhaiyaan is a Pakistani drama series which is considered a classic. It is the story of two sisters who lose their parents and go to live with their aunt. In one of the sisters efforts to buy back her parents’ house, she realizes what makes a house a home. Beautifully acted by Shahnaz Shiekh, this drama featured such legends of Pakistani drama acting as Qazi Wajid.

http://en.wikipedia.org/wiki/Tanhaiyaan

PTV Drama: Ankahi

Posted: 9th October 2011 by Noman Shah in Childhood TV Serials, Memories
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Ankahi was a popular Urdu drama serial broadcast by Pakistan Television Corporation(PTV) in 1982. The drama was written by renowned Haseena Moin and superbly directed by Shoaib Mansoor and Mohsin Ali. (The original director was Shahzad Khalil who died in harness.) The play was yet another feather Haseena Moin’s as well as PTV’s cap. The popularity of the play was such that even today its DVDs/CDs are in huge demand not only in Pakistan but also in the neighboring India and by all those South Asian expatriates around the globe.

http://en.wikipedia.org/wiki/Ankahi

PTV Drama: Dhoop Kinaray

Posted: 9th October 2011 by Noman Shah in Childhood TV Serials, Memories
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Dhoop Kinare (Urdu: دھوپ کنارے) meaning at the edge of the sunshine in Urdu was a Pakistani television serial presented by the PTV network. The show centers around a team of doctors in a hospital in Karachi and revolves around their routines at the hospital and private lives at home. The show starred Rahat Kazmi and Marina Khan in lead roles, was directed by Sahira Kazmi and written by Haseena Moin.

In the early days of PTV, drama serials were usually applauded for being richly diverse in their plots and direction. They were celebrated not just in Pakistan but their quality content was cherished over the border in India as well. A long list of such dramas may usually include Dhoop Kinare as one of those at the top. The drama serial enjoyed seemingly undeniable success for two further decades after it finished airing on television. This serial is usually said to have promoted the careers of both Rahat Kazmi and Marina Khan as one of the most sought after stars in Pakistani television industry.

http://en.wikipedia.org/wiki/Dhoop_Kinare

Bicycles as Bug-Out and Utility Vehicles

Posted: 22nd September 2011 by Noman Shah in Everyday Carry, Survival, Transport
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Firstly I wish there were at least as many bicycle articles and questions on SurvivalBlog as gun posts. As a gun maker, gunsmith, firearm owner, and combat user I still put a fancy semi-auto combat rifle below a decent bicycle for most people’s survival purchase priorities. Let me offer a contrarian viewpoint on the priority of complete firearm battery in your survival shopping list. Obtain some snares, a quality .22 semi-auto, and a few thousand rounds of ammo, a few months of food and cooing fuel, basic camping/shelter gear and then get a decent bicycle. It is quite possible to hunt for meat and drive off most random bandits with a .22, just remember when money becomes available that you can do much better once you have other very important categories squared away. As I usually try to squeeze into all of my posts, survivalism is not being a Navy SEAL, a SWAT team, or even a gun collector, it is about surviving. Someone that confuses their gun, ham radio, equestrian, medieval weapon, or other hobby for survivalism leads to misplaced priorities and funds that are better spent on important preparations. When cruising bike shops, thrift stores, and police auctions consider the following: Don’t worry about the state of the tires, since you will probably replace them even on a new bike. Learn how to recognize a good set of rims and a well built wheel with good spokes, this is a major failure area, they should be round and when spun roll freely and not move to the left and right(small deviations can be fixed by an expert adjusting the spokes). Road rims are often too light for survival use but are quite nice if you know you will be touring on well paved road, for our purposes though stick to the more universal 26-inch heavy mountain rims. Unless you are an expert on servicing shock absorbers go for a hard tail and solid forks, the majority of discount bikes have junk springs and no oil dampeners and are a weak point in the design. Good long life shocks for big guys can be around $300 or more in my experience (I weight over 200 pounds), anything less has left me with blown seals even in moderate to heavy utility use. Handlebars are more important than most leisure riders would think, long rides will make you want more hand positions than a straight mountain bike handlebar offers, rams head bars or at least wrapped ‘horns’ give you a place to reposition and rest your hands on long rides. Good bike gloves really help here too. Some conversations with bike mechanics, test driving bicycles, and visiting bicycle nut boards (just like gun nut boards) will help you know which types of brakes, shifters, cables, dérailleurs, and other components are good and which are junk. Especially examine the rear dérailleur and dérailleur hanger on used bikes for breakage and the front dérailleur for chain wear, replace and stock quality brake pads and cable. You will be replacing any used chain, keep your chain clean and oiled with proper oil, carry and learn how to use a chain breaker tool, stockpile quality chain and bicycle chain oil; these are big barter items. A worn chain will wear down the sprockets, look for saw tooth shaped sprocket teeth and if present replace the gear cassette. In flat country a single speed bicycle with coaster brakes is the best choice since it is nearly maintenance free, but consider a good gear range set if a bug out to mountainous territory is a possibility, remembering that once gears are involved, even the best expensive internal hubs are less reliable than a simple single speed. There has been a fad of fixed gear, a web search will tell you more, my opinion is that it just moves the mechanical stress to your legs an knees, fine if you are 16 years old but not if you are 40. You will be repacking all of the wheel and crank bearings with quality bearing grease on a used bicycle, I use marine grade grease hoping it will be more waterproof. Check the frame for stress cracks and dents from accidents, especially aluminum or exotic frames. Steel frames can be welded or brazed especially in a low stress area, Aluminum and exotic composition repairs are best left to experts or thrown out. Buy and have spares for your bicycle saddle, get a performance seat not a lazy-boy fat seat, test out several but remember that your butt will get used to a performance seat after a while, but a far comfort seat might make it harder to aggressively pedal. Men be sure to get something that protects your ‘family’ anatomy. A seat that is too hard and regular pressure can damage your tissue and circulation leading to dysfunction, especially on bumpy roads. It is possible to rebuild a saddle with full grain cowhide, especially if you find someone skilled in shoe making, I don’t like rear shocks because of weight and cost but I do use a spring saddle to protect my spine from big road shocks. I always stay away from the cheap toy/department store bicycles and their dismal components, there is no realist upgrade path for this junk other than replacement so avoid it unless you have no alternative, any bike is better than no bike, if you are stuck you could always make it into a one speeder coaster brake bike, eliminating the cheap unreliable gears. Buy the best tires and tubes you can afford, this is where the rubber literally meets the road. Since I switched to Schwable Kevlar tires I have not had a flat in 3 years of hard urban commute, even using other high quality brands I usually needed to patch a tire at least once every other month over ten years of heavy rural and urban high mileage cycling, Schwables are also very long wear life tires. Knobby tires might sound good for mud, but they rob you of much rolling momentum on roads, Specialized brand Cross-Roads tires are a good compromise with knobby sides and a center strip for dry dirt, hardpan, and paved roads. For a good example of a nearly ideal survival bicycle research the old Swiss military bicycles. If there is a possibility of hitchhiking there are tough quality folder bikes available, never discount the utility of grabbing a free ride over your own muscle power, even in TEOTWAWKI. Try to stick to a bike with quality standard components which can be improvised or scavenged from junked bicycles if required. After doing some solid research you will still need to invest some money to get a good bicycle most of the time, new expect to spend a minimum of $300 list price, do not waste your money at toy or discount stores, either buy quality used and have service done at a competent local bike shop or let them help you pick out something new, just like buying a firearm. You will need to carry a repair kit at all times including a good pump, quality patches (I use Rema Tip-Top), a spare tube in case the valve stem is damaged or you cant patch the hole, tire levers, and a folding bike tool I like the Crank Brothers multi tools which include spoke, chain, hex and screwdrivers and more. Swap in your good tube and patch the hole when you are in a comfortable place. If you are really in the rough carrying a folding tire in your pannier might be worth the weight versus walking, tubes, patches, and tires are serious stockpile and barter items. Buy a quality helmet, ankle strap, gloves, and lights, since in most scenarios you will be sharing the road. There are many more considerations and much research is required to buy, build, or rebuild a good survival cycle, there is plenty of info on discussion boards to help you but start at http://www.sheldonbrown.com/ Sheldon Browns bicycle mechanic web site, he is no longer with us but his genius will continue to help cyclists.

Courtesy: http://www.survivalblog.com/2009/04/six_letters_re_bicycles_as_bug.html

http://dlsoucy.wordpress.com/2010/04/21/motorizing-your-survival-bike/

 http://commuterbicycle.com/

http://survivalism.blogspot.com/2009/06/prepare-cycling-for-survival.html

http://www.cyclebanter.com/showthread.php?t=212524

 http://sensiblesurvival.blogspot.com/2010/12/survival-bicycle.html

http://modernsurvivalblog.com/preps/which-bicycle-is-best-for-survival/

The S3 Spyder III Arctic is the world’s most powerful laser you can legally own. It’s got a cool-blue, but blazing-hot, 1W laser beam. Currently being tested by Guinness World Records this is the world’s most powerful handheld laser. •Completely legal laser power. The 1000 mW output power of the blue laser beam is able to burn through balloons, plastic, and much more. In the U.S., it’s totally legal to use a laser of any power for appropriate, non-commercial private use.* •100% unlimited duty cycle. Operate the laser continuously, 24/7 with no risk of damaging the laser diode. •Strong laser in a strong body. The aircraft grade aluminum chassis lets you be confident that the body is as tough as the laser is strong. It’s also totally portable, smaller than a regular flashlight, you can carry all this power in the palm of your hand. •More than just power. This is the first laser to have multiple operating modes (low power, high power, low-power strobe, high-power strobe). You have total control of the 1 Watt laser beam. •Powerful safety features. The SmartSwitch technology locks out unauthorized access to your laser so you have peace of mind this super-powered laser is safe when you’re not around. Note: This laser is too powerful to be used as a gun sight. Never point it at another person, animal, or vehicle.

Model IZH-18MH Hunting/Sporting Rifle by Baikal

Posted: 23rd April 2011 by Noman Shah in Firearms, Sports

The Model IZH-18MH by Baikal has been called one of the most appealing and accurate single shot, break open rifles on the market today. The IZH18MN is true old world craftsmanship. Out of the box dependable and accurate and affordable without sacrificing quality.

It is noted for easy and reliable handling, high degree of safety, ensured by dependable safety unit and hammer safety lug. High patterning is secured by advanced design of barrel and forend joint, eliminating thermal deformation of barrel, when shooting. Simple and dependable system of bore lock via rocking lever. Trigger action is accommodated in receiver, thus simplifying the design and increasing overall reliability of the gun. Hammer with a “rebound” and a separate spring-loaded striker provide for easy break-opening. Forend and stock of IZH-18H rifles are made of top-quality walnut, beech or birch.

A single-shot break-open rifle using the buttstock, trigger mechanism and up rated action from the IZH-18EM-M single-barrel ejector shotgun now fitted with a high-quality 600mm (23.5″) hammer forged barrel. Furniture is stained birch. Iron sights are fitted plus a dovetail scope mount on the barrel. The safety is a non-automatic cross-bolt. These rifles shoot remarkably well and are strong and long-lived making them popular with professional users as working rifles. It is beautiful shotgun style rifle that can be broken down as per a shotgun for transport and storage.

Features and Specifications:

• Internal Hammer Design
• Tapered Spiral Fluted,
• Hammer Forged Chrome Lined Barrel
• Cocking Indicator
• Walnut Stock and Fore-End • Cross Bolt Safety
• 11mm Scope Rail

May be available in calibers; .223 Remington .308 Winchester .222 Remington 30-06SPRG
23.5″ hammer forged, chrome lined, spiral fluted, precision barrel
Cocking indicator
Machined steel receiver
1″ sling swivels and studs
Adjustable sights
11mm scope mount
Synthetic stock
Blue finish
39.75″ overall length
6.75 lbs.

Tapping America’s Secret Power Source

Posted: 23rd April 2011 by Noman Shah in Renewable Energy

How much energy do we waste in America? A little over half of it, says Arun Majumdar, the Almy and Agnes Maynard professor of mechanical engineering at UC Berkeley.

The U.S. consumes about 100 quads of energy a year, he said. A quad is a quadrillion BTUs. A BTU is equivalent to the energy produced by a match.

“Of the 100 quads, about 55 to 60 go into waste heat,” he said. “Fifty or 60 percent of the energy is wasted as heat.”

The culprit is waste heat, the heat that is emitted into the atmosphere by everything from nuclear power plants and factories to car engines and that power brick on your laptop.

A new crop of startups, however, are tinkering with ways to make this useful. The companies can be divided into two categories. On one hand, there are the companies with mechanical systems, which capture heat, compress it and exploit the pressure to crank a turbine. ElectraTherm, for instance, recently raised $2.6 million to further test out its low-heat converter. ElectraTherm uses captured heat to boil a liquid refrigerant to create pressure. The company’s Green Machine can produce up to 50 kilowatts of power with 200 to 400 Fahrenheit.

Recycled Energy Development (RED), founded by the father and son team of Tom and Sean Casten, is erecting a $45 million to $55 million plant at silicon producer West Virginia Alloys that could produce 40 to 44 megawatts of power when it becomes operational by 2010. Potentially, it could offset one-third of West Virginia Alloy’s power. The Castens, who have participated in over 250 waste heat projects, have asserted that RED can reduce an industrial customer’s power consumption by 20 percent.

Meanwhile, others are using solid state solutions to work with thermoelectric materials. These materials can convert heat into electricity and vice versa. Potentially, thermoelectric materials have an advantage over mechanical systems because there are fewer parts. Thermoelectrics can also potentially work at lower temperatures. Micron-Gap Thermal Photovoltaic (MTPV) is working on what it calls Thermal PV (i.e., a solar panel that can produce power from sunlight like other solar modules, but with an additional layer of material that can convert solar heat into electric power).

In a similar vein, GMZ Energy has a material that it says can accomplish the same heat-to-electricity conversion but with heat from industrial equipment. Going in a reverse direction, Promethean Power, which recently raised money from the Quercus Trust, wants to sell thermoelectric fridges to emerging nations. Electricity harvested from solar panels would be run through thermoelectric materials to produce hot and cold air streams. The cold would be used on the fridge.

And expect a startup to emerge from Berkeley soon. A team under Majumdar has devised a technique for making thermoelectric chips out of silicon nanowires, columns of pure silicon. Silicon ordinarily has a very low ZT, a number for calculating thermoelectric properties. Bismuth telluride, a thermoelectric material that researchers have examined for years, has a ZT of around one.

“The performance has been so low that it has not been cost effective,” he said. Tellurium also now costs close to $100 a pound, thanks to the popularity of cadmium telluride solar cells.

Ordinary silicon has a ZT of 0.008. The silicon nanowire devices, however, may be able to achieve a ZT of 2, judging from early experiments. In turn, that could mean electric power at $1 a watt or less, which would make waste heat competitive with coal. “What is needed is a ZT of 2 or more,” he said. “Can we get to a ZT of 2? I’m optimistic.”

The Berkeley team is already talking to TSMC, the Taiwanese chip giant, about trying to manufacture nanowire thermoelectric chips.

Channel Changes

Not all waste heat can be converted to electrical power economically. Some gets lost merely in the process of delivering power. Nonetheless, there’s a lot of heat out there. A 2005 survey from the Lawrence Berkeley Lab estimated that the U.S. at the time had 100 megawatts of untapped power in waste heat, garbage and petroleum byproducts. These waste products could ultimately supply 19 percent of U.S. power. About half of the power in the study would come from harvesting heat and pressure.

Expanding the waste heat industry, however, would likely require regulatory and grid changes. Right now, most factories that have installed waste heat systems consume the power themselves. But many of them want to sell power to third parties. Glass factories, for instance, can generate 6 megawatts of power with their 450 degree Celsius waste heat, said Majumdar. For that to happen state laws would likely have to be changed.

In the meantime, thermoelectric materials, following more extensive testing, could begin to be incorporated into a number of products. Engine and exhaust heat in cars, for instance, could be harvested if the material were cheap enough. Brake heat could help increase the power collected by regenerative braking systems.

But why convert at all? Why not just use the heat? In a word, location. Heat doesn’t travel well. 

“Power plants would need to be in a city,” said Majumdar

http://www.greentechmedia.com/articles/read/tapping-americas-secret-power-source-5259/