Thursday, December 30, 2010

Best Power Cords For Acer Computers

In the present, all of us are surrounded by electronic devices and we all use them in order to do different things that you have to. Laptop computers are those devices that people use in order to do their work in a fast and efficient way. With the help of such a device, people can even work and travel in the same time, thing that is great for all of us. Nowadays, many of us live an agitated life and we often are on a run. A laptop computer makes our lives much easier because with its help, we are able to do our work in a fast period of time not mattering where we are. Stores offer us a large variety of laptop computer and choosing one can turn out to be quite difficult for some people. When buying a laptop, we must first think at our needs because based on them we make the decision if to buy a device or not. All the people from all over the world have different needs and requirements and for some of them, buying a laptop computer can turn out to be difficult because they do not know which one to pick.


All in all, when buying such a device, you must first know for what you will use it for because as I said above, its meaning is very important. Buying the perfect laptop for you is most recommended because only in this way, you will be able to make your daily activities at time and in an efficient way. Acer is a company that is known all over the world and there are many people who tend to buy their products because there are said to be out of a good quality, they have great characteristics and they also are reliable and long lasting. The people who already own such a laptop computer, say that it is a very good and reliable one and the working on them is very easy and fast.


Just like other laptop computers from other manufacturers, Acer devices need to charge their batteries when empty. All laptop computers come equipped with a battery that has the role to keep the device running as long as it has power. It is just like a mobile phone. When the Acer Laptop Battery such as Acer BTP-43D1 Battery, Acer TravelMate 220 Battery, Acer BTP-58A1 Battery, acer BTP-60A1 Battery, Acer TravelMate 240 Battery, Acer BTP-52EW Battery, Acer BTP-63D1 Battery, Acer BTP-42C1 Battery, acer BTP-44A3 Battery, Acer BTP-550P Battery, Acer BTP-73E1 Battery, Acer BATCL50L Battery and Acer TravelMate 290 Battery is empty you have to recharge it and recharging the battery at a laptop computer requires a power cord. Power cords for Acer notebooks can be found in every store that sells laptop computers. These power cords aren’t so bought because they do not tend to brake down. Most of the cords from most laptop computers run like in the first day.


Although they aren’t willing to brake down, some people need to buy power cords for Acer notebooks and they have two possibilities of buying. They can go to a store that sells such things or they can search on the Internet for websites that sells them and order the needed one. So, power cords for Acer notebooks can be found in many places and buying them is very simple.

Compaq Laptop Market

Laptops play in our days a very important role in our lives because we all use them all day long. The laptop had a great impact in our lives because it is considered by some people their best friend and partner and they know that it wouldn't let them down anytime. This device is so loved by many of us because it took the place of the classical desktop computer. Comparing the two devices, the differences that we see are huge. First of all, a laptop is much smaller and you can carry it around with you in your case or backpack so we can see that this device offers us great portability. The desktop computer just stood on the desk waiting for you to go to it to work on because it is too big and heavy to carry it around with you at work or in the bus.


Compaq is one the greatest laptop manufacturers on the present market. Compaq laptops are chosen by many people because of their reliability and performance. Compaq is a company that puts accent on high performance and built quality, just like HP. From my point of view, performance and built quality are two of the most important decision factors when buying a laptop but there are others like durability and reliability.


Compaq laptops such as Compaq EVO N600C, Compaq EVO N610C, Compaq EVO N620C, Presario 1200, Presario 1800, Presario 700, Presario 900, Presario 1700, Compaq Armada E500, Compaq EVO N100, Compaq Evo N1020V, Compaq Evo N1000C and Compaq Evo N115 are one of the best laptops on the market today. They have high performance and last generation laptops that many people want to buy. Most of us when buying a laptop look at its specifications and at its built quality because these two are very important for us and our final decision. Compaq even own in the present the best laptop in world that was voted by its owners and future owners.


It is called the Compaq Presario CQ61Z Customizable Notebook PC. In the opinion of most of the laptop users, Compaq Presario CQ61Z Customizable Notebook PC is the best laptop from all Compaq laptops but it is the best laptop in the world at the present time too. Its specifications are great... is has:


-Genuine Windows 7 Home Premium 64-bit

- AMD Turion(TM) II Dual-Core Processor M500 (2.2GHz, 1MB L2 Cache)

-4GB DDR2 System Memory (2 Dimm)

-Possible Upgrade to 250GB 5400RPM SATA Hard Drive

-ATI Radeon(TM) HD 4200 Graphics w/128MB Display Cache Memory and 5-in-1 Digital Media Reader & HDMI

-15.6" diagonal High Definition HP LED Brightview Display (1366x768)

-LightScribe SuperMulti 8X DVD+/-RW with Double Layer Support

-Microphone Only

-Wireless-G Card

-HP Color Matching Keyboard

-6 Cell Lithium Ion Battery

- Microsoft(R) Works 9.0


It is a great laptop computer with great specifications and excellent built quality and all of us can agree that the title of the best laptop in the world and the best from all Compaq laptops fits it the best but I hope that soon will appear other laptops with even greater specifications.

Wednesday, December 29, 2010

Crafting a brand and scaling it big

Turn the corner from Main Street onto Carleton by the Kendall Square T station at quarter to noon on a typical summer day and you'll see lunch trucks lined up along the curb. There's Jerusalem Falafel and Olives Kitchen (falafel), José's (Mexican), and Goosebeary's (Thai-Vietnamese). Kendall Square doesn't offer many cheap, tasty restaurants, so the trucks play a central role in its culinary ecosystem. Clover's truck stands out in the lineup, and not just for the crowds it attracts. There's no splashy art, no cartoon characters--just a white truck with a black-and-white hand-lettered logo and menu. "The only color is from the people and the food," Muir says. "Natural things."


Clover's customers are a mix of MIT students, staff, and professors (Yet-Ming Chiang '80, ScD '85, materials science and engineering professor and cofounder of the upstart battery company A123 Systems who make batteries such as Apple M8403 Battery, Apple M7318 Battery, apple PowerBook G3 Battery, Apple PowerBook G4 Battery, Apple PowerBook G4 15 inch Battery, Apple A1012 Battery, Apple M8511 Battery, Apple M8244 Battery, Apple A1079 Battery, Apple A1078 Battery, Apple A1148 Battery and Apple M6091 Battery, is a regular), as well as area workers and the stray outsider who's read about Clover on a food blog. Clover's order takers stand on the sidewalk, where they often greet customers by name. Sandwiches and drinks are passed hand to hand instead of getting placed on a counter or a tray. That's deliberate, Muir says, to maximize interaction and build relationships. "It's important to have as much face-to-face contact as possible," he says.


The background music is an ever-­changing bluesy mix. The menu includes lavender lemonade, hibiscus iced tea, fresh-cut rosemary French fries made with potatoes from Prince Edward Island (600 miles from Boston, but a lot closer than Idaho), and a special summer sandwich that features basil spread slathered on Havarti cheese and thick-sliced local cukes. A sidewalk board promises a tasty afternoon snack: "Sweet plantains, thick cut and fried, Aleppo pepper and sugar = fried plantains, our 3 p.m. special." The prices are low, considering the quality: $5.00 for a sandwich, $3.00 for soup or an inventive side salad.


Customers say that besides the prices, the cool factor is definitely part of Clover's appeal. But the flavor is what keeps them coming back. Mike Norman, a recent Sloan School grad and founder of SoChange, a startup that encourages consumers to use their economic power to do good, was queuing up for the popular "egg and egg" sandwich--slices of hard-boiled egg from Chip-in Farm in Bedford, Massachusetts, served in a whole-wheat pita with roasted eggplant, cucumber-tomato salad, hummus, and tahini. Norman, a Clover regular, is a self-described meat eater, and he never expected this combination of ingredients to be so delicious. "Who knew?" he says. Students of marketing can learn from Muir's approach, Norman says: "Ayr stays very close to his customers and asks for a lot of feedback. He can experiment fast with the food truck."


Muir himself has dreams that stretch far beyond Kendall Square. He's got a second truck at South Station, and he was slated to open his first sit-down restaurant in Harvard Square, at Holyoke Center, this fall. He expects his staff to double with the opening of the restaurant. Ultimately, he envisions thousands of locations worldwide--all with an ecological footprint much smaller than what's typical for fast food.


Other companies have managed to preserve their distinctiveness as they grew far and wide, Muir says--Apple, Trader Joe's, and In-N-Out Burger, to name a few. Yet it remains to be seen whether a style of eating that's become so popular in Cambridge will play as well in Peoria or Prague. Can vegetarian fast food that's fresh, local, and sustainable scale across the country and around the world? "I think it can as long as we don't call it that," Muir says, "because no one will eat it if we do."

Laptop Program to Intel

In January 2005, MIT Media Lab cofounder Nicholas Negroponte announced the One Laptop per Child (OLPC) program, a utopian attempt to improve education in poor communities through the design and global distribution of cheap, low-power laptops. Eventually, Negroponte said, the laptop would sell for a hundred dollars. The program was conceived on a grand scale: Negroponte initially claimed that the laptop would not go into production until governments worldwide had placed a total of five million orders.


But the million-unit orders never materialized. To date, Peru is the program's largest customer by a large margin, having ordered about 270,000 laptops. So in November 2007, the laptop, dubbed the XO, went into production anyway, at a cost of roughly $188 a unit. At about the same time, OLPC began its holiday-season Give 1 Get 1 drive: any donor who contributed $399 to the project would receive a complimentary XO, and a second XO would be sent to a poor community.


Some observers considered the drive a desperate attempt to inject cash into a floundering endeavor. Then, last week, Intel walked away from a tempestuous six-month partnership with OLPC, scotching the planned unveiling of an Intel version of the XO at this week's Consumer Electronics Show in Las Vegas. The main point of contention appears to have been Intel's attempts to sell its own cheap laptop, the Classmate PC, to governments that had already made provisional commitments to OLPC. OLPC claims that Intel violated a nondisparagement clause in its contract; Intel claims that the clause bound only the company's officers, not its sales force. The New York Times greeted the news with a headline announcing "The Demise of One Laptop per Child."


Earlier this week, Technology Review senior editor Larry Hardesty sat down with Walter Bender, OLPC's president for software and content, to discuss both Intel's withdrawal and the overall health of the initiative.


Technology Review: What effect does Intel's departure have on the program?


Walter Bender: Zero. Intel had contributed nothing. They contributed nothing to our current product, the XO. They contributed nothing to our learning models. They contributed nothing to the software. So their going away, so far, is a wash for us.


TR: Isn't this just the latest blow to the program?


WB: After what?


TR: After large contracts not materializing. Originally, wasn't there a minimum requirement for a government order?


WB: Originally, there was. We certainly made some mistakes along the way. And one mistake was to be a little bit too rigid in our model. Part of it was just based on some false assumptions on our part in terms of what kind of volume we needed to get things launched. And we thought that going to a few large orders was the best way to jump-start things, to prime the pump.


Some of us, our instinct was quite different. And that was to try to get a broad base and try to make this a grassroots, bottom-up launch instead of a top-down launch. Now, it turns out that we have both. And really, what we're after is any good idea. So on the one hand, we actually do have some large orders. Maybe not as large as we had originally hoped for, but we're going to do a quarter of a million laptops such as Compaq Armada E500, Compaq Armada M700, Compaq EVO N400c, Compaq EVO N410c, Compaq EVO N600C, Compaq EVO N610C, Compaq EVO N620C, Presario 1200, Presario 1800, Presario 700, Presario 900 and Presario 1700 just in Peru. And we're doing something on a similar scale in Uruguay.


Those are examples of top-down. But then there's a lot of bottom-up. We just did about 100,000 bottom-up machines that we're going to be distributing through the "give" part of the Give 1 Get 1 program.


TR: What was the purpose of the Give 1 Get 1 program?


WB: Our purpose was twofold: one was to enable us to jump-start laptop programs in places that couldn't afford to start them themselves. So we're trying to jump-start Haiti, Rwanda, Mongolia, Afghanistan, Ethiopia, Cambodia.


The second point is that we want to broaden the base of participation. There are a lot of people who want to participate in this program, who want to be part of this global-learning movement. So the number of people who are engaged in our mission has increased dramatically over the last month. We're finding that the community is really jumping in in ways that are beyond our expectations. So for example, now we've got 40 volunteers manning a phone bank, around the world.


TR: It's customer support?


WB: It is customer support. But it's customer support from the community instead of from us. Part of the reason we can make the laptop inexpensive is that we're not building those kinds of things into the cost structure. We're cutting all those corners. And the way that we can cut them is to design this so that people can have local ownership of the problem. And so, for example, quite literally--you can go to YouTube and see this in action--a nine-year-old can replace the motherboard on the laptop.


When the backlight in my Lenovo laptop dies, I have to send it back for factory repair, and they replace the whole display. And if it wasn't done through warranty--and the warranty costs me more than one of our laptops--I'd probably toss the laptop and buy a new one, because it wouldn't be worth it. If the backlight dies on our laptop, it is ten screws and a two-dollar part. And not only is it ten screws and a two-dollar part--that a nine-year-old can do the field repair on--but even without the backlight, the laptop still works.


TR: With natural illumination?


WB: Yeah. And that broken display that someone's going to toss in a landfill somewhere--the one I have from Lenovo has mercury in it. The one that we make doesn't. So we've thought about this stuff. This is not a hack. It's not an academic exercise. It's serious stuff, and it's stuff that we're doing better than anybody else right now. And we hope that the rest of the world learns from what we're doing and does better than us. But right now they aren't. But they will. And that's part of the plan.


TR: Does that mean you plan to license your technology to other manufacturers?


WB: That's something we've been struggling with. We need an economist to help us figure this one out. It's not clear to me that we wouldn't be better serving kids to make everything we've done be available to anybody for any purpose. And that might get more laptops to more kids faster.


TR: So from your perspective, this could still be a success even if you stopped manufacturing laptops and the technology found its way into a dozen different laptops ...


WB: Yep. But I think it's premature to do that. And the reason is quite simple: unless we keep the pressure on, the prices are going to go up, the efficiencies are going to go down, and we're going to be right back to the same "bigger, faster" model. We've got to keep the pressure on and keep the industry honest until we've really proven that this other way is viable. Because otherwise, next year's Intel machine will be more expensive and more power hungry, and that's not going to serve the needs of these kids.


TR: Okay, I have to say, I've played with the laptop, and it seems slow.


WB: Well, it's certainly slow compared to the laptop you carry around. But the metric you have to measure things by is not Grand Theft Auto III. The metric you want to measure things by is learning. The word processor keeps up with my typing. The video camera works just fine. The music programs work just fine. It's a perfectly adequate platform for kids for learning. Every decision we make is, How does this enhance the learning? And the bottom line is, if you can't turn it on since you can't power it, a fast processor doesn't do you very much good.


TR: There's also the question of whether laptops are really what governments should be sinking resources into.


WB: The way Nicholas [Negroponte] likes to put it is, substitute the word "education" for "laptop." And then ask, "Should we be giving these kids education?" "Nah, they don't need education! Education is a luxury. Why should we give them education?" What we're advocating is that the laptop is the most efficient way we know of of giving them an opportunity for real learning. It's not that we're interested in laptops; we're interested in learning. And it turns out that almost 50 years of research by people like [computer scientist and educational theorist] Seymour Papert has demonstrated that computation is a wonderful thing to think with. It's powerful stuff. And it's going to change these kids' lives dramatically for the better.

Sunday, December 26, 2010

Lithium-Ion Battery Storage

Battery startup Amprius says it has developed batteries capable of storing twice as much energy as anything on the market today, thanks to nanostructured silicon electrodes. The company says it is partnering with several as-yet unnamed major consumer electronics manufacturers to bring the batteries to market by early 2012. The batteries will allow portable electronics to run 40 percent longer without a recharge.


Amprius also says it is working with several major automakers who are evaluating the electrode materials for use in batteries for electric vehicles. The company is not yet disclosing these commercial partners, either.


When a lithium-ion battery such as Compaq EVO N610C Battery, Compaq EVO N620C Battery, Compaq Presario 1200 Battery, Compaq Presario 1800 Battery, Compaq Presario 700 Battery, Compaq Presario 900 Battery, Compaq Presario 1700 Battery, Compaq Armada E500 Battery, Compaq EVO N100 battery, Compaq Evo N1020V battery, Compaq Evo N1000C battery and Compaq Evo N115 battery is charged, lithium ions move from its cathode to its anode, while electrons flow in through an external electrical circuit. The process is reversed during discharge. The more lithium the anode can take in, the more total energy the battery can store, and the longer it can last. For the past 30 years, lithium-ion batteries have used carbon anodes. With no new materials, the total energy storage of these batteries has improved by only about 7 percent every year due to incremental engineering refinements.


Silicon has 10 times the theoretical lithium storage capacity of the carbon used to make battery anodes, but it's been difficult for researchers to make it into a practical battery electrode. As large volumes of lithium ions move in and out of the material during charge and discharge, silicon swells and cracks.


In 2007, Yi Cui, a Stanford University materials science and engineering professor, demonstrated that nanostructured silicon films could be charged and discharged of lithium without experiencing these mechanical problems, making a potential anode material that could as much as double the energy storage of lithium batteries.


In the 18 months since Amprius was founded, researchers at the company have built on Cui's research and have demonstrated that the silicon anodes can be used in practical batteries. Silicon nanowires, which are vertically arrayed and tethered but flexible, are used to make the battery anodes.


As the nanowires take in lithium, they can swell and bend to accommodate it, without breaking. However, this isn't mechanically stable enough. Amprius has addressed this problem by giving the nanowires a thin, reinforcing metal core that the company likens to rebar (the steel strut used to reinforce concrete structures). This "rebar" prevents the anode from expanding and contracting too much. In testing, the silicon anodes can store three times more energy than carbon anodes by weight.


Prototype batteries have been tested through 250 charging cycles and have been shown to store twice the energy of a conventional battery. To be a serious contender for use in electric vehicles, however, the batteries will need to go through 3,000 charging cycles, says Ryan Kottenstette, the company's director of business development.


Amprius CEO Kang Sun says the company is moving aggressively to bring its batteries to electric vehicles. "We are in a hurry, because electrification is moving forward faster than anyone thought," he says. Sun, the former president of Chinese solar manufacturer JA Solar, notes that there are already about 80 electric-vehicle makers in China. "We have to be fast," he says. The company expects to disclose some automaker partnerships in the next few months.


Conventional carbon anodes are made using large roll-to-roll systems. Kottenstette acknowledges that the vacuum deposition technique used for silicon nanowires will be more expensive. However, once potential manufacturing issues are ironed out, the company expects the boost in storage capacity to make up for the increased cost. The company is also working on a roll-to-roll vapor-deposition system. "Making it compatible with current processes is important to us," says Kottenstette.

Technology's Ambassador

My brother and I would argue about what we were seeing as Margaret Benyon's Tigirl changed each time we shook our heads. At least once a year as we were growing up, our grandparents took us to the MIT Museum, where our favorite exhibits included the holography collection, Arthur Ganson's kinetic sculptures (we loved the wishbone), and the strobe-light photography of Doc Edgerton, SM '27, ScD '31 (the bullet going through the apple never ceased to amaze us). And visiting gave my grandfather, Harvey Steinberg '54, then chairman of the museum advisory board, a chance to share his MIT stories with us.


Fast-forward a few years. I was taking a year off after my sophomore year at MIT and needed something to do. My grandfather suggested that I might be able to help out at the museum, which had just opened its Mark Epstein Innovation Gallery. So I ended up volunteering there several days a week from October to August.


I started by doing behind-the-scenes work, compiling research on new exhibits and assembling supplies for workshops. But at the Friday After Thanksgiving (FAT) Chain Reaction, I got my first chance to interact with the public. FAT teams make Rube Goldberg-­inspired machines that are started by a pulled string and end up pulling the string of the next machine. One of the coolest parts for me was getting to meet the event's MC, Arthur Ganson, the creator of the awesome kinetic sculptures at the museum. I built a link in the chain myself that year (with some help from my brother) and have gone back every year since.


Shortly after Thanksgiving, we began preparing for the Rube Goldberg Competition for middle-school students that the MIT Museum cohosts each April at the Fay School in Southborough, MA. We spent much of December ordering supplies and assembling kits; in January, we trained teachers from each participating school. As an MIT student mentor (each team gets one), I visited my team at their school and helped them plan. Although each team got the same task and the same materials, when I saw the machines in action in April, I was impressed by how different and creative each approach was.


That spring, I disassembled my first computer as part of the museum's "take-apart" event during the annual Cambridge Science Festival. I also got the job of playing with some recently obtained Lego MindStorms kits. Each kit contained basic Lego pieces, sensors, and a cable to connect the base to a computer so it could be programmed. Once I familiarized myself with the parts and the software, I helped write the curriculum for the initial MindStorms workshop, which the museum now offers regularly to school groups. (Fun fact: MindStorms' programmable bricks were developed at the MIT Media Lab.)


My summer at the museum was a ton of fun! We had a rotating schedule of drop-in activities: visitors could try out Lego ­MindStorms, inexpensive XO computers from One Laptop Per Child (OLPC), a giant tornado machine, and activities in the DNA Learning Lab. In creating the OLPC demo, we visited the project's headquarters in Kendall Square and took apart a laptop (such as ThinkPad R60, ThinkPad T60, IBM 40Y6797, IBM 40Y6799, IBM FRU 92P1139, IBM FRU 92P1141, IBM FRU 92P1137, IBM 02K6651, IBM 02K6928, IBM 02K6620, IBM 02K7039, ThinkPad X60). It was a blast to play with cool stuff all day.


When it was time for me to return to school that fall, I wanted to share the museum with the rest of the MIT Community (free with MIT ID!). The night of registration day, we had a big party with ice cream, music filled with bad science puns, and construction projects involving toothpicks and Dots candy.


As a student again, I still visited the museum frequently to escape the stress of the semester. For the 2008 Cambridge Science Festival, I took a break from working on my 2.007 robot to stand at the museum's booth for an hour and explain what a phenakistoscope is (it's an early animation device based on the principle of persistence of vision). I then helped families make their own. And during IAP 2009, I helped create a giant geodesic dome, first in Lobby 13 and then again in the MIT Museum. It was large enough to lie in!


Volunteering at the museum gave me great opportunities to develop my skills at working with the public and explaining technical information. The place I visited regularly growing up is now filled with many more memories.

Saturday, December 25, 2010

Flexible Transistors

The implementation of pervasive computing-the spread of digital information throughout society--will require electronics capable of bringing information technology off the desktop and out into the world ( see " Computing Goes Everywhere ," ). To digitize newspapers, product labels and clothing, integrated circuits must be cheap and flexible-a tough combination for today's silicon technology. Even the cheapest form of silicon electronics-the cut-rate "amorphous" silicon used to drive laptop(such as ThinkPad R60 and ThinkPad T60) display screens-is too pricey. What's more, it's difficult to incorporate silicon electronics on bendable surfaces such as plastics.


Technology innovators are taking a couple of routes around these limits. Some researchers are trying to reinvent amorphous silicon. Others have abandoned inorganic compounds like silicon to develop transistors based on organic (carbon-based) molecules or polymers. These organic electronics are inexpensive to manufacture and compatible with plastic substrates. Indeed, research teams at places such as Lucent Technologies' Bell Labs, England's University of Cambridge and Pennsylvania State University have made impressive progress, and commercial products are nearing the market. Last fall, for example, Philips Research in Eindhoven, the Netherlands, showed off the first prototype of a rudimentary display driven by polymer semiconductors. But there's a catch: Organics are far slower than their silicon cousins.


Now, a 31-year-old materials scientist at IBM, Cherie Kagan, may have opened the door to cheap, flexible electronics that pack the mojo needed to bring ubiquitous computing closer. Her breakthrough? A compromise: transistors made from materials that combine the charge-shuttling power and speed of inorganics with the affordability and flexibility of organics.


These hybrids were created by chemist David Mitzi at IBM's Thomas J. Watson Research Center in Yorktown Heights, N.Y. By the time Kagan arrived at Watson in 1998 following a stint at Bell Labs (she earned a PhD from MIT in 1996), Mitzi had already shown that his materials possessed intriguing electronic properties. Kagan had a hunch they might make good transistors. But she needed quick results; she'd been hired as a postdoc-a limited-time offer.


At the outset, the transistors flipped on and off sluggishly. "The first times, I didn't want to calculate [the speed]," says Kagan. But she kept tweaking, and in less than a year she had increased the mobility of electric charges through her transistors by four orders of magnitude-matching the speed of amorphous silicon and far exceeding most organic transistors. The results won her a staff position and her own lab at IBM.


Kagan has since increased the speed by another 50 percent; further fine-tuning, she believes, could provide at least another doubling in acceleration. Not only may the hybrids be far faster than amorphous silicon, they have a key advantage over silicon-based electronics. Like some organic materials used to make transistors, the hybrid materials can be dissolved and printed onto paper or plastic just like particles of ink. "I make my materials in a different lab and carry them over and add some liquid and spin them on," says Kagan. "It's not very sophisticated, which is sort of the goal, right? You really want it to be cheap."


Thomas Jackson, a transistor expert at Penn State who is developing organic circuits, says Kagan's "fledgling results" could pave the way for fast yet flexible electronics. Jackson credits Kagan with seizing the opportunity. "Not only does she have her own pocket of competence, but she's able to look around and see exciting possibilities and then bring things together. IBM has been working on these sorts of materials for some time, but it took the energy and enthusiasm and vision and perspective of Cherie to translate that into a thin-film transistor."


The transistors could compete with organic electronics in a variety of applications, such as radio-frequency product ID tags. And then there's the $20 billion-per-year market for flat-panel video displays, where the speed of Kagan's transistors could really make a difference. Quicker circuits would deliver sharper displays than those driven by amorphous silicon at a fraction of the cost. That would open the door to affordable wall-sized displays or high-quality displays that pop out of your pen. If all goes well, the materials could be used in cheap, flexible displays within five years.


Of course, bright displays that fit in your pocket will require portable power, and that has Kagan pondering her next research challenge: cheap, flexible materials for solar cells to liberate pervasive computing from bulky batteries. "You aren't going to want to carry a battery around with your lightweight flexible display," she says.

Cooling Battery Test

Later this month, two new electric cars—the GM Volt and the Nissan Leaf—will start appearing in eco-conscious driveways across the United States.


The Nissan Leaf promises 73 miles per electric charge, while the GM Volt gets 35 miles per charge, although it also has a backup gasoline engine for longer trips. But GM and Nissan are taking different approaches to ensuring that the batteries in these cars last and remain safe. The way these batteries perform over the next few years will suggest which approach is better, and could shape the design of future electric cars and plug-in hybrids, which all major automakers have promised. Some critics say that Nissan's battery-pack design, which uses a relatively simple cooling system, could allow the batteries to overheat, decreasing the life of the battery and posing a safety concern.


Both GM and Nissan use lithium-ion batteries (a technology that's long been used in laptops and mobile phones) as opposed to nickel-metal hydride batteries, which have proved reliable in gas-electric hybrids such as the Toyota Prius, but which are bulky and heavy.


In choosing lithium-ion over nickel-metal hydride, GM and Nissan are taking a risk because such batteries haven't yet proved reliable in the demanding role of powering a car. Car batteries must endure temperature extremes, harsh jolts, and continuous vibrations from the road, and have to perform well for about a decade. In a few rare cases, lithium-ion batteries can overheat and catch fire, a problem that has required massive recalls of some laptop batteries. The batteries needed for electric vehicles must also store far more energy—so a fire caused by auto batteries could be particularly dangerous.


Another drawback of using lithium-ion batteries is that they quickly lose their ability to hold charge. After a couple of years of use, it's not unusual for them to store half as much power as they did when they were new. Automakers want car batteries that will last for the life of a vehicle—about eight to 15 years.


To address these issues, GM and Nissan have made significant changes to the lithium-ion batteries they're using. Instead of using lithium cobalt oxide —the material preferred in laptop batteries because of its high energy density—as the electrode, they're using lithium manganese oxide, which stores a relatively large amount of energy, but is more stable, in part due to the arrangement of its atoms. In a manganese-oxide electrode, atoms form a three-dimensional structure that maintains its shape even as lithium ions move in and out of the electrode as the battery is charged and discharged. The less stable structure of conventional battery electrode materials can be damaged as lithium ions move in and out, which shortens the useful lifetime of a Compaq Laptop Battery such as Compaq Armada M700 Battery, Compaq EVO N400c Battery, Compaq EVO N410c Battery, Compaq EVO N600C Battery, Compaq EVO N610C Battery, Compaq EVO N620C Battery, Compaq Presario 1200 Battery, Compaq Presario 1800 Battery, Compaq Presario 700 Battery, Compaq Presario 900 Battery and Compaq Presario 1700 Battery.


GM and Nissan have also switched from a cylindrical shape for the batteries (the battery cells inside typical laptop packs look like large AA batteries) to a flat rectangular shape that saves space and also allows heat to escape better. Overheating can damage the batteries, decreasing their ability to store charge, and, in some cases, can lead to a phenomenon called thermal runaway, when elevated temperatures result in chemical reactions that lead to yet more heat, eventually resulting in a fire.


But major differences emerge when you look at how GM and Nissan designed their battery packs—the collection of battery cells, electronics, and temperature controls that make up the complete battery. The biggest difference is how the companies choose to control the temperature of the packs. Nissan has opted for a simple design, using a fan to cool its batteries. It says that the flat shape of the battery cells makes additional cooling unnecessary. GM's design is more complex. A liquid coolant carries fluid past the surface of each cell in the pack and to a small radiator outside of the pack.


Liquid cooling systems can carry heat away from battery cells more quickly than air cooling. Additionally, "liquid cooling is much more compact," says Bill Wallace, GM's director of global battery systems. "You can move much more heat, and move it much more uniformly."


Wallace says liquid cooling was chosen to ensure that all of the cells in a pack are within two °C of one another. Along with preventing overcharging, "temperature control is the most important knob you can turn in terms of improving battery life," he says.


Liquid cooling is the approach chosen by Tesla Motors, which makes an electric sports car using lithium-ion battery cells that were originally designed for other applications. The cooling method ensures that even if some cells overheat and catch fire, the rest wouldn't. In a recent earnings call with investors, Elon Musk, the CEO of Tesla Motors, criticized the Nissan design, saying it could cause temperatures to be "all over the place," which could degrade battery performance.


Because cold weather can limit the amount of charge a battery pack can store, and cause damage to the battery, GM's pack also has a 1,800-watt resistive heater to keep the battery pack from getting too cold. Nissan recommends a cold weather package that includes a battery heater, but this doesn't come as standard. And the option is not available for the first Leafs to come off of the assembly line, and it cannot be added to a car later. If the Leaf pack gets too cold, or too hot, it enters a limited power mode, which restricts acceleration and top speed.


The Volt is also engineered to hold a certain amount of charge in reserve when the car is new to help preserve battery life. As the battery ages, some of this reserve capacity will be released, which will help the car maintain its electric range over time. GM expects the capacity of the battery to fade between 10 and 30 percent during the life of the car (about eight to 10 years). Nissan has not said if it will use a similar approach, but it has said that the Leaf's battery capacity will fade 30 percent in 10 years. It has also noted that exposure to hot temperatures could decrease battery capacity faster.

Friday, December 24, 2010

A Better Battery for Laptops

Boston-Power says that it's poised to enter the market for portable power, with a notebook battery the company claims is safer, lasts longer, and can be charged faster. The Westborough, MA, startup recently announced that it is more than tripling production of its high-performance battery, called the Sonata, after receiving $45 million in a third round of venture financing. The move puts the company in a position to mass-produce and commercialize its next-generation lithium-ion battery within months.


"In partnership with GP Batteries, one of Asia's largest battery manufacturers, we now have our second factory up and running in the greater China region," says Christina Lampe-Onnerud, the company's founder and CEO. In 2002, Technology Review named Lampe-Onnerud one of its top innovators under the age of 35 for her efforts to develop better-performing lithium-ion batteries with less volatile substances. Based on that research, she founded Boston-Power in 2005. Now, after raising $68 million in total, she says that her company will be able to manufacture a million battery cells per month by the end of 2008.


Oak Investment Partners, based in Westport, CT, provided this latest infusion of capital, building upon earlier investments by Venrock Associates, Granite Global Ventures, and Gabriel Venture Partners.


Although the Sonata will not offer greater energy capacity per use--with a four-hour run time, its performance will be average for the market--the company hopes that the battery's three-year life span, innovative safeguards, and ability to recharge quickly will help it gain a foothold in the battery market. As opposed to existing notebook batteries, which can take an hour to recharge to 80 percent capacity, the Sonata can reach that same level in just 30 minutes, according to Boston-Power. And whereas current batteries degrade very quickly, permanently losing up to 50 percent of their capacity within months, the Sonata retains up to 80 percent of its capacity over three years. In fact, since the typical laptop battery tends to degrade very rapidly, the Sonata will have a greater per-use capacity in the long run.


To make the cell retain its capacity over its lifetime, Boston-Power found it necessary to change the current lithium-ion design. The company identified a combination of new chemistry mixtures and electrode compositions, and it created a new shape--all of which enables a consistent performance over the cell's lifetime. The different shape made it possible for the company to increase the volume of the cell and more efficiently use the space within a battery pack, allowing it to reach energy-storage levels competitive with current conventional batteries such as IBM FRU 92P1137 Battery, IBM 02K6651 Battery, IBM 02K6928 Battery, IBM 02K6620 Battery, IBM 02K7039 Battery, IBM ThinkPad X60 Battery, IBM FRU 92P1167 Battery, IBM ThinkPad Z60t Battery, IBM ThinkPad Z61t Battery, IBM 40Y6793 Battery, IBM FRU 92P1125 Battery and IBM FRU 92P1121 Battery.


In the past, it has been very difficult to make lithium-ion cells larger, since a larger energy density creates a potential for greater catastrophic malfunctioning. Conventional lithium-ion batteries use cobalt oxides, but the substance has been partly responsible for some of the more dramatic laptop explosions in recent years. So instead of using cobalt, which also tends to degrade quickly, the company incorporated manganese. Boston-Power isn't the only company using manganese; other companies, such as Compact Power, are also trying to take advantage of its stability. Boston-Power is incorporating the element into a larger than average cell.


The company has also made the battery safer by separating several conventional safety measures and by inventing new ones. In existing notebook batteries, the current interrupt device and the thermal fuse are packaged on top of each other in the cell's lid. But by separating these elements from each other, the company has built an extra layer of redundancy into the system. These elements are able to control and cut off the current flow, should the battery begin to overcharge. The company has also devised a new ventilation system to alleviate the pressure and heat before they build to catastrophic levels. With aluminum in its canister, rather than carbon steel or nickel, as is common, the Sonata's shell softens much sooner at high temperatures and then self-destructs with a hiss. More-durable elements like carbon steel, which melts at even higher temperatures than aluminum, exacerbate explosions by letting extraordinary pressure and heat build inside the cell until its breaking point. (This is why conventional laptops emit loud booming cracks when they burn.)


"There is a lot of progress being made in battery technology with different chemistries," says Robert Kanode, president and CEO of Valence Technology, an Austin, TX, startup that manufactures phosphate lithium-ion batteries. His company is a competitor with Boston-Power, but Kanode adds, "We know we will not be standing alone: this will be a huge market with many viable players in it."


Lampe-Onnerud says that Boston-Power is in discussions with most of the world's top-tier notebook makers, including Hewlett-Packard, which over the past two years has worked closely with the company, helping it design battery packs that can be dropped into existing notebooks.


"The Sonata opens up a whole new business model for notebook manufacturers that hasn't been available in the past," says Ifty Ahmed, a general partner with Oak Investment Partners, who worked on the deal. Although notebook makers can presently offer a three-year warranty for a computer, they can't make the same offer on a battery, a component that can cost about 10 percent of a laptop's total value. "The market for warranties is extremely profitable," Ahmed says. "So if you can sell a warranty on the battery for three years, you have a very exciting idea."


Boston-Power says that it is focused on commercializing the Sonata, but it also believes that its patented safety features could eventually be used in lithium-ion batteries for smaller consumer-electronics devices as well as for hybrid electric vehicles.

Laptops in the Classroom

The Michigan Department of Education has announced an ambitious plan to get laptops into the hands of the state's 130,000 sixth graders for use at school and with their homework.


Dell, Apple, and a range of other companies are already lining up to compete for what they estimate will be $156 million of business over the first four years of the program.


Apple already holds the contract for the program which Gov. Angus King has launched in Maine to insure that every seventh grade student and teacher in the much smaller state has access to a laptop. Educators in both states are trumpeting the educational benefits of insuring that no child is left behind when it comes to accessing the digital realm.


These laptops such as ThinkPad R40, ThinkPad R32, IBM 02K6928, IBM 02K7054, ThinkPad A20, ThinkPad A20M, ThinkPad A21M, ThinkPad 240, ThinkPad 240Z, ThinkPad A30, ThinkPad A31 and ThinkPad 600 can provide the infrastructure to support a range of other educational experiments and developments, designed to give kids greater access to pedagogical resources. They can help move us from an age where the computer is something they keep in labs to one where the computer is something they use everyday in many different ways in their classrooms.


In the Comparative Media Studies program, we are developing digital databases designed to enhance the teaching of core humanities subjects -- everything from the Declaration of Independence to Moby Dick -- building on the success of Peter Donaldson's pioneering Shakespeare Electronic Archive. We have also announced the launch of the Education Arcade, a collaboration with the University of Wisconsin-Madison, and we hope, many other colleges and universities to promote development of educational games, the creative use of existing commercial games in the classroom, the development of tools so teachers can design location-specific hand held games, and the growth of media literacy efforts where kids design their own games as part of the learning process.


As we learned over the past decade, it isn't enough to wire the classroom or expand computer resources if you are not going to put an equal effort and money into the development of curricular materials and practices which creatively and intelligently deploy that new infrastructure. You need to develop the teacher training programs and technical support which allows them to rethink old practices and develop new approaches appropriate for the digital age.


It is clear what computer companies have to gain from giving every school child a laptop not just in terms of state contracts but also in terms of building their consumer base for the future. But educators need to see this as the first step towards solving some of the problems confronting education. If the computer giveaway is all that happens, we should be prepared for disappointment.

Thursday, December 23, 2010

Solving Laptop Larceny

In May, the U.S. Department of Veterans Affairs learned the hard way that laptop computers are easy targets for theft: burglars struck the home of a department analyst who'd taken his laptop home without authorization, and made off with social-security numbers, birth dates, and other personal information for more than 26 million veterans and spouses, as well as 2 million active military, National Guard, and Reserves personnel.


That well-publicized incident -- the latest in a string of thefts compromising key data from large organizations -- is reawakening interest in technologies for protecting laptops and prompting security companies to tout their latest advances.


These new systems, which aren't intended to prevent theft, but rather mitigate their consequences, come in three flavors: tracking software, encryption, and "kill" switches that can make a laptop's data self-destruct.


Extra layers of protection are needed because the password and encryption mechanisms that come with most laptops such as IBM 92P1101, IBM 92P1089, IBM 92P1087, IBM 08K8196, IBM 92P1102, IBM 92P1077, IBM 92P1073, IBM 08K8199, IBM 08K8198, IBM 08K8197, IBM 92P1075, ThinkPad R40, ThinkPad R32 are weak or inconvenient, says Jack Gold, head of J. Gold Associates, a market research firm in Northborough, MA. "There are hacker tools that let you get around [passwords] very quickly, or you can boot from a CD," Gold says. It's true that any laptop running Windows XP Professional has an optional encryption function that should defeat thieves, but using it slows down normal file access.


One solution, then, is a tracking system, such as Computrace, run by Absolute Software of Vancouver, Canada. William Penn University in Oskaloosa, IA, turned to the system this year, after about 500 laptops in one of its colleges went missing, says Curt Gomes, the university's IT supervisor. The university decided it had become uneconomical to try to hunt down each machine manually. Instead, Gomes decided to try laptop tracking -- a technique that's been around for a decade, but recently has seen sales growth of 50 percent per year.


Each machine subscribed to the Computrace service typically reports to a company server once a day via the Internet. If the computer is reported stolen, the server will instruct it to start sending messages every 15 minutes. And if the missing machine's Internet address can be pinned down to a street address, police will soon show up there, according to company spokesman Les Jickling. In fact, a week after William Penn signed up for the Computrace tracking system, a laptop stolen out of a car was recovered by police five days later.


The tracking system also helps keep students honest. "Before, we had a huge rate of people dropping out of the program and not bringing their laptops back," Gomes recalled. "Now I let them know that I can track them. Their eyes kind of open, and they bring it back right away."


The Computrace service costs about $50 per year* per machine. At that price, Gomes figures the service will pay for itself if it prevents ten $2,000 machines from disappearing. A boxed consumer version of Computrace, called "Lojack for Laptops" (after the car-tracking device), costs $49.99 per year.


Some 80 percent of stolen or wayward laptops protected by Computrace are recovered, according to Jickling. A thief would be safe if he kept the stolen laptop off line -- but that rarely happens, especially now that Wi-Fi networks have sprouted in every apartment building and corner café. Absolute Software has placed the instructions for contacting Computrace into the basic input-output system (BIOS) of recent Hewlett-Packard, Gateway, Lenovo, Dell, and Fujitsu laptops, so that even reinstalling the operating system will not stop the machines from reporting in, Jickling says.


Nevertheless, since tracked machines remain in the hands of thieves until they're recovered, another security measure may also be useful: encryption. One firm licensing Absolute's software, CyberAngel Security Solutions in Nashville, TN, combines tracking with an encryption scheme. Their software creates an encrypted partition on the hard drive, says spokesperson Bradley Lide. If someone boots the system without inputting the right password, they will be able to use the machine -- but it will hide the encrypted partition from the user while sending alerts to the tracking service.


"If you steal it, boot it, and connect it, and violate authentication, the computer operates like a honey pot, as we draw in the thief while protecting the confidential information on it," says Lide. The service starts at about $60 per machine per year.


But "kill" switches are the most dramatic -- and drastic -- way to foil thieves. As with Computrace, laptops equipped with kill switches report to a central server at intervals. But no tracking is attempted; instead, the purpose is to check whether a machine should start destroying its data files.


When a stolen machine reports in, it can be instructed to overwrite selected files, explains Jeff Rubin, a representative of Santa Clara, CA-based Beachhead Solutions, which offers a kill service called Lost Data Destruction. Deleting a file -- simply putting it into a trash can or recycle bin, is not sufficient, since the data is still on the disk. The Pentagon, for instance, requires three over-writes to expunge sensitive data. Beachhead's system, which starts at $129 per year, can be set to overwrite as many as eight times.

The Electric Cooling Battery Test

Later this month, two new electric cars—the GM Volt and the Nissan Leaf—will start appearing in eco-conscious driveways across the United States.


The Nissan Leaf promises 73 miles per electric charge, while the GM Volt gets 35 miles per charge, although it also has a backup gasoline engine for longer trips. But GM and Nissan are taking different approaches to ensuring that the batteries in these cars last and remain safe. The way these batteries perform over the next few years will suggest which approach is better, and could shape the design of future electric cars and plug-in hybrids, which all major automakers have promised. Some critics say that Nissan's battery-pack design, which uses a relatively simple cooling system, could allow the batteries to overheat, decreasing the life of the battery and posing a safety concern.


Both GM and Nissan use lithium-ion batteries (a technology that's long been used in laptops and mobile phones) as opposed to nickel-metal hydride batteries such as IBM ThinkPad R60 Battery, IBM ThinkPad T60 Battery, IBM 40Y6797 Battery, IBM 40Y6799 Battery, IBM FRU 92P1139 Battery, IBM FRU 92P1141 Battery, IBM FRU 92P1137 Battery, IBM 02K6651 Battery, IBM 02K6928 Battery, IBM 02K6620 Battery, IBM 02K7039 Battery and IBM ThinkPad X60 Battery, which have proved reliable in gas-electric hybrids such as the Toyota Prius, but which are bulky and heavy.


In choosing lithium-ion over nickel-metal hydride, GM and Nissan are taking a risk because such batteries haven't yet proved reliable in the demanding role of powering a car. Car batteries must endure temperature extremes, harsh jolts, and continuous vibrations from the road, and have to perform well for about a decade. In a few rare cases, lithium-ion batteries can overheat and catch fire, a problem that has required massive recalls of some laptop batteries. The batteries needed for electric vehicles must also store far more energy—so a fire caused by auto batteries could be particularly dangerous.


Another drawback of using lithium-ion batteries is that they quickly lose their ability to hold charge. After a couple of years of use, it's not unusual for them to store half as much power as they did when they were new. Automakers want car batteries that will last for the life of a vehicle—about eight to 15 years.


To address these issues, GM and Nissan have made significant changes to the lithium-ion batteries they're using. Instead of using lithium cobalt oxide —the material preferred in laptop batteries because of its high energy density—as the electrode, they're using lithium manganese oxide, which stores a relatively large amount of energy, but is more stable, in part due to the arrangement of its atoms. In a manganese-oxide electrode, atoms form a three-dimensional structure that maintains its shape even as lithium ions move in and out of the electrode as the battery is charged and discharged. The less stable structure of conventional battery electrode materials can be damaged as lithium ions move in and out, which shortens the useful lifetime of a battery.


GM and Nissan have also switched from a cylindrical shape for the batteries (the battery cells inside typical laptop packs look like large AA batteries) to a flat rectangular shape that saves space and also allows heat to escape better. Overheating can damage the batteries, decreasing their ability to store charge, and, in some cases, can lead to a phenomenon called thermal runaway, when elevated temperatures result in chemical reactions that lead to yet more heat, eventually resulting in a fire.


But major differences emerge when you look at how GM and Nissan designed their battery packs—the collection of battery cells, electronics, and temperature controls that make up the complete battery. The biggest difference is how the companies choose to control the temperature of the packs. Nissan has opted for a simple design, using a fan to cool its batteries. It says that the flat shape of the battery cells makes additional cooling unnecessary. GM's design is more complex. A liquid coolant carries fluid past the surface of each cell in the pack and to a small radiator outside of the pack.


Liquid cooling systems can carry heat away from battery cells more quickly than air cooling. Additionally, "liquid cooling is much more compact," says Bill Wallace, GM's director of global battery systems. "You can move much more heat, and move it much more uniformly."


Wallace says liquid cooling was chosen to ensure that all of the cells in a pack are within two °C of one another. Along with preventing overcharging, "temperature control is the most important knob you can turn in terms of improving battery life," he says.


Liquid cooling is the approach chosen by Tesla Motors, which makes an electric sports car using lithium-ion battery cells that were originally designed for other applications. The cooling method ensures that even if some cells overheat and catch fire, the rest wouldn't. In a recent earnings call with investors, Elon Musk, the CEO of Tesla Motors, criticized the Nissan design, saying it could cause temperatures to be "all over the place," which could degrade battery performance.


Because cold weather can limit the amount of charge a battery pack can store, and cause damage to the battery, GM's pack also has a 1,800-watt resistive heater to keep the battery pack from getting too cold. Nissan recommends a cold weather package that includes a battery heater, but this doesn't come as standard. And the option is not available for the first Leafs to come off of the assembly line, and it cannot be added to a car later. If the Leaf pack gets too cold, or too hot, it enters a limited power mode, which restricts acceleration and top speed.


The Volt is also engineered to hold a certain amount of charge in reserve when the car is new to help preserve battery life. As the battery ages, some of this reserve capacity will be released, which will help the car maintain its electric range over time. GM expects the capacity of the battery to fade between 10 and 30 percent during the life of the car (about eight to 10 years). Nissan has not said if it will use a similar approach, but it has said that the Leaf's battery capacity will fade 30 percent in 10 years. It has also noted that exposure to hot temperatures could decrease battery capacity faster.

Wednesday, December 22, 2010

Strained Days Indeed

Without delving into exotica such as quantum and biological computing, Moore's Law should continue for another 15 years.


By that time, though, transistors will be so small and tightly packed that they'll consume huge amounts of electricity and require expensive cooling units, making them less useful for personal and mobile applications.


In particular, the power consumption problem (which is primarily an issue of leakage) could limit the processing power of laptops, smart phones and other battery-powered mobile devices upon such as IBM ThinkPad R60 Battery and IBM ThinkPad T60 Battery which the industry's technology scenarios depend. With the power-thrifty Dual Stress Liner (DSL) technology announced in December, Advanced Micro Devices and IBM have taken a big step toward ensuring that Moore's Law applies to more than just the chips that run supercomputers.


By reducing the size of transistors and the silicon-covered spaces between them, fewer electrons leak away in transit when transistors are turned on. Because newer processors have far more transistors, though, this advantage is somewhat offset by the greater number of opportunities for leakage and the increase in static leakage, which is the power and heat drain that seeps away when all those transistors are turned off.


The DSL technology doesnt solve this problem, it simply bypasses it by using a method other than reducing feature size to improve speed..


Like other "strained silicon" processes, DSL stretches and compresses different portions of the silicon to improve current flow.


The immediate payoff lies in performance, with both companies claiming a 24 percent boost in transistor speed compared with the 15 to 20 percent gains with Intel's current strained-silicon technology


And both AMD and IMB claim they can achieve these results without consuming more power or raising the production costs.


As with any processor, boosts in transistor speed are considerably larger than the real-world performance improvements you can expect in your next computer. Yet, in cases in which speed is prioritized over power savings, AMD expects gains of up to 16 percent in computers running its new DSL AMD64 processors due this summer. Similarly, IBM should deliver Power-Architecture processors with equal gains around the same time. Sony and Toshiba also participated in the development of the technology and may use it in the upcoming CELL processor which is designed for consumer electronics products.


Like Intel's strained silicon, which was introduced in 2003, DSL overcomes the challenge posed by the split personality of computer processors, which are a hodgepodge of negative and positive transistors.


Negative transistors perform better when stretched, as the elongation of the silicon orbitals tends to iron out energy variations that could slow the path of electrons. Positive transistors work better when compressed. Until recently, it has been difficult to apply the two types of treatments without favoring one transistor type over the other.


"Putting a tensile film over one type of transistor and a compressive film over another is pretty tricky," says Nick Kepler, AMD's vice president of logic technology development. "We found a way to do strained silicon on negative and positive transistors simultaneously and we used conventional materials."


Instead of using the exotic silicon germanium, which others like Intel have done, AMD and IBM have managed to get by with the more familiar silicon nitride. By sticking with a conventional process, says Kepler, yield should be higher and costs lower.


"Silicon germanium is more costly and adds more complexity to the manufacturing flow," he says. "There are many issues associated with it when you add materials or etch the cavity, and creating the strain is more complex."


The DSL approach applies a compressive film over the entire chip and then etches the material away from the negative transistors. A tensile strain film is then applied universally and etched away from the P-type transistors.


For any given chip, strained-silicon chip makers can select an optimum tradeoff between power consumption and speed. With DSL, tuning for performance/power tradeoffs can be done at two stages.


"During fabrication, we can make very slight changes, making the transition gates longer or thicker to reduce leakage," Kepler says. "Or later we can turn down the voltage on the part."


Either way, AMD and IBM promise to further improve power efficiency and reduce heat by integrating DSL with the duo's previously introduced Silicon-On-Insulator technology, which adds a thin insulating layer between substrate layers to minimize leakage.


DSL technology is already being incorporated into older 130nm designs, and it will be added to AMD's new 90nm dual-processor Opteron chips this fall. According to Kepler, DSL has been successfully tested with next-generation 65nm designs, and he expects it to work fine when they shrink their processors to 45nm, as well.


The AMD/IBM advantage may not last long. By the end of year, Intel should introduce its first 65nm processors, which include an improved form of germanium-based strained silicon that Intel claims will provide 30-percent speed increases over non-strained chips.


The basics of strained silicon technology have been known for over a decade, but warping silicon hasn't been a priority because it was far easier to meet Moore's Law by scaling down transistors. Beyond 45nm, however, it will become considerably trickier to gain the same performance improvements with consistent yield without undue power consumption and heat.


Yield is also an issue with strained silicon, as defects tend to crop up when you warp silicon. This may be particularly true with germanium. Texas Instruments, for example, is working on a strained silicon technology that uses the absolute minimum of germanium in order to reduce defects.


A year from now we should know whether Intel has solved the germanium yield problem or whether AMD and IBM were smart to stick with silicon nitride. For consumers, though, the important point is that semiconductor manufacturers are finally placing power efficiency at an equal priority as speed. After all, speed doesn't matter if your battery runs out.

IBM's Faster, Denser Memory

Researchers at IBM have demonstrated the feasibility of an entirely new class of data storage, called racetrack memory, which promises to combine the data storage of a magnetic hard disk with the ruggedness and speed of Flash memory, at relatively low cost. In addition, racetrack memory wouldn't degrade over time as Flash does. While still in the early days of research, these benefits could make racetrack memory an attractive replacement for both hard disks and Flash memory, leading to ever smaller computers and extremely inexpensive memory for iPods and other portable devices that now rely on Flash.


In this week's issue of Science, the team, led by Stuart Parkin, a physicist at IBM's Almaden Research Center in San Jose, CA, described a way to read and write multiple bits of data to magnetic nanowires, an important step toward making a prototype. Previous work by the group illustrated that the fundamental concept of racetrack memory was feasible, but the researchers hadn't yet demonstrated the manipulation of multiple bits. "It's a milestone in developing a prototype," says Parkin.


Racetrack memory consists of an array of billions of nanowires on silicon; each nanowire is able to hold hundreds of bits of data. Because the nanowires are so small, racetrack memory has the potential to be many times more dense than Flash. Unlike Flash memory, in which bits are stored as electrical charges in a transistor, racetrack memory stores data as a series of distinct magnetic fields along the wire. Flash memory degrades over time as charges leak and memory cells wear out, but racetrack memory, which uses magnetic fields, doesn't have this problem. And compared to the hard disks used in laptops and PCs such as ThinkPad T40, ThinkPad T41, ThinkPad T42, ThinkPad T43, ThinkPad R50, ThinkPad R51, IBM FRU 08K8193, IBM 92P1060, IBM 08K8214, IBM 08K8195, IBM 08K8193, IBM 08K8192 and IBM 92P1101, which store data on a bulky, spinning platter, racetrack memory has no moving parts and can be built in silicon, making it more robust.


Data is encoded onto racetrack memory by changing the magnetic properties along the wire, creating a series of magnetic barriers--called domain walls--and gaps between. Just as electrical charge represents a bit in a Flash memory cell, the gaps between two domain walls represent bits in racetrack memory. To read and write data from the nanowire, the domain walls move along the tracks, single file, past where stationary read and write heads are positioned.


That is, at least in theory, how it would work. But before the current research, no one had shown that multiple domain walls--essentially, data--could move along a nanowire without being destroyed. In order to move the domain wall down the nanowire, Parkin uses principles from spintronics, which takes advantage of the quantum mechanical property of electrons, called spin. He injects a small electrical current into the nanowire. As a result, the electrons in the current become "polarized," so that their spins are uniformly oriented, and when they contact a domain wall, they transfer the orientation of their spin to the atoms in the wall. This hand-off changes the magnetic moment of the atoms in the domain wall, shifting it forward on the racetrack, and likewise shifts all the domain walls on the racetrack forward, explains Parkin.


That is, at least in theory, how it would work. But before the current research, no one had shown that multiple domain walls--essentially, data--could move along a nanowire without being destroyed. In order to move the domain wall down the nanowire, Parkin uses principles from spintronics, which takes advantage of the quantum mechanical property of electrons, called spin. He injects a small electrical current into the nanowire. As a result, the electrons in the current become "polarized," so that their spins are uniformly oriented, and when they contact a domain wall, they transfer the orientation of their spin to the atoms in the wall. This hand-off changes the magnetic moment of the atoms in the domain wall, shifting it forward on the racetrack, and likewise shifts all the domain walls on the racetrack forward, explains Parkin.

Tuesday, December 21, 2010

Flash Memory Moves onto the Desktop

For the most part, flash memory has been used in small audio gadgets such as iPods and in portable USB drives. But a recent flurry of announcements from flash chip makers Intel and Samsung, among others, show that the technology has reached a point at which it is finally economical to integrate a small amount of flash memory--from 128 megabytes to 8 gigabtyes--into laptops and desktops as a supplement to the magnetic hard drive. The benefit, say chip makers, is faster boot times, faster application start-ups, and impressive power savings.


Since flash memory, which is created from silicon, is based on solid-state electronics, there are no moving parts, which makes it faster and more energy efficient than the spinning magnetic disks used in hard drives. Because flash is faster, it can be employed to cache frequently used files and applications. And since it is nonvolatile memory, flash can be used to store the start-up files for a system when the power is off, so that a computer can boot up much faster.


Earlier this month, Samsung, which is a major flash manufacturer, began shipping a device called a hybrid drive, which integrates flash memory into the same package as the magnetic storage. The hybrid drive was developed with Microsoft, says Steve Weinger, flash marketing manager at Samsung, and it's designed to take advantage of Vista's ReadyDrive feature, software that recognizes when flash memory is available and transfers data to it that would usually be saved on a hard disk. For instance, the software would instruct the system to download frequently accessed files to a flash cache instead of to the hard drive. In addition, when a file is saved, it's immediately saved to flash memory. When the memory reaches capacity, the data is sent to the hard drive at once, reducing the number of times the hard drive needs to spin up, saving time and power. Samsung's hybrid drives, which come with either 128 or 256 megabits of flash, are designed for high-end consumer desktops and laptops such as Fujitsu FPCBP80, Fujitsu FPCBP63 and Fujitsu FPCBP95 that run Vista.


Within the past couple of years, Intel has expanded its products to include flash memory chips. The company is working on a flash chip called Robson--expected within the year--that is also designed to work with Vista features. As with Samsung's hybrid drive, Intel's system will be able to save energy by less frequently using a hard disk by keeping a cache in flash, says Greg Matson, product manager for Intel's NAND flash group. Robson is designed for consumer and enterprise systems that run Vista. Unlike Samsung's hybrid drive, which integrates flash into the disk, Robson flash will be integrated into the motherboard of a computer.


In addition, Intel, Samsung, and others are working to completely replace magnetic hard drives in certain systems. Last week, Intel announced a solid-state drive designed for low-end servers and inexpensive computers that require less than eight gigabytes of data. Also, earlier this week, electronics maker Fujitsu announced that it is offering a rugged system with 16 gigabytes and 32 gigabytes for a cost of $500 and $1,300, respectively. Fujitsu's target markets are the health-care, aviation, and delivery industries, for which flash provides another advantage: because of its lack of moving parts, it's sturdier than magnetic disks and less prone to damage in rough environments.


There are still challenges before flash really competes with computers' hard drives. For one thing, it tends to wear out over time, as files are written and erased from memory sectors. Currently, flash is capable of 100,000 rewrites per cell, and specialized software has been developed to spread out the wear on flash chips, says Ethan Miller, professor of computer science at the University of California, Santa Cruz.


However, Miller says, this software might not be good enough when flash is used as a hard drive supplement or replacement because operating systems tend to frequently save numerous small files, such as error files or system logs. But as prices continue to fall, Miller adds, flash will become a more common option, and he expects that more and more systems will be designed with flash in mind.

Recent Battery Advances

Electric vehicles, hybrids, and renewable energy have at least one thing in common--if they're ever going to be more widely used, representing the majority of cars on the road or a large share of electricity supply, batteries need to get significantly better. Batteries will need to store more energy, deliver it faster and more reliably, and ultimately, cost far less. The specific ways batteries need to improve vary by the application, but in all these areas, researchers have been making significant headway.


Last week, MIT researchers led by Yang-Shao Horn , a professor of materials science and engineering and mechanical engineering, and Paula Hammond, a professor of chemical engineering, announced a new approach to high-power lithium-ion batteries, the type that's useful for hybrid vehicles or for stabilizing the electricity grid. High-power batteries accept and deliver charge rapidly. In hybrids, the goal is to supplement the gasoline engine, allowing it to run at its most efficient. The battery drives the car at low speeds for short distances and boosts acceleration, lowering demand on the engine. It also captures energy from braking that would otherwise be lost as heat. For the electricity grid, such batteries could buffer changes in supply and demand of electricity--something that's becoming more important as more variable sources of electricity are introduced, such as wind and solar power.


The MIT researchers demonstrated a new battery electrode, based on specially treated carbon nanotubes, that last for thousands of cycles without any loss in performance. Batteries made from these electrodes could deliver enough power to propel large delivery vans or garbage trucks, for example, without the batteries being too heavy to be practical. (The researchers need to increase the thickness of the electrodes for them to be practical in these applications.) Companies such as A123 Systems, based in Watertown, MA, have also developed very high-power lithium-ion batteries, and other academic groups and startups are developing carbon nanotube-based ultracapacitors, which store energy using a different mechanism than batteries that's particularly useful for high power and long life.


While the new electrodes could eventually be useful for hybrids, and for stabilizing the grid, they aren't particularly good for other applications such as all-electric vehicles. For electric vehicles, the total amount of energy that batteries store is more important than how fast that energy can be delivered, since it's the total amount that determines how far these cars can travel between charges. The MIT researchers who developed the new carbon nanotube electrodes are also developing a different type of battery to store large amounts of energy. Called a lithum-air battery, where one of a battery's two electrodes is replaced by an interface with the air, the technology has recently attracted large amounts of government funding and interest from companies such as IBM. In theory, such batteries could store three times as much energy as conventional lithium-ion batteries such as IBM ThinkPad R40 Battery, IBM ThinkPad R32 Battery, IBM 02K6928 Battery, IBM 02K7054 Battery, IBM ThinkPad A20 Battery, IBM ThinkPad A20M Battery, IBM ThinkPad A21M Battery, IBM ThinkPad 240 battery, IBM ThinkPad 240Z battery, IBM ThinkPad A30 battery, IBM ThinkPad A31 battery and IBM ThinkPad 600 battery. But the design has a number of problems that make it hard to commercialize, among the vulnerability of its active materials to moisture (the lithium metal it uses can catch fire if it gets wet) and the batteries' tendency to stop working after being recharged just a few times.


Like lithium-air batteries, other potential high-energy battery technologies face a number of hurdles, which could help explain why hybrids with their high-power rather than high-energy batteries have been more successful than electric vehicles. Many of the most promising battery chemistries are too difficult to make at a large scale, fall apart after a few cycles, or are too expensive. According to the U.S. Department of Energy, complete battery packs today cost between $800 and $1,200 a kilowatt hour, and store about 100 to 120 watt-hours per kilogram. To make electric vehicles practical and affordable, the DOE would like to see costs drop to $250 per kilowatt hour and increase storage capacity to over 200 watt-hours per kilogram. (Reaching these goals will require even higher storage capacities for the individual battery cells that make up battery packs--about 400 watt hours per kilogram.)


While improving batteries for hybrids and electric vehicles is difficult, one of the biggest long-term challenges for battery researchers is making batteries that can cheaply store vast amounts of energy generated by solar panels and wind turbines, so that electricity from these sources is available when the sun isn't shining or the wind isn't blowing. For now, such batteries aren't needed--there's enough power from conventional sources to take up the slack. But if solar and wind are ever to provide the majority of electricity, storage will be needed, and batteries today are far too expensive. The DOE goal for such batteries is less than $100 per kilowatt-hour, less than half its goal for electric vehicles. It's cheaper today to build a natural gas power plant as a backup source of power, or to store energy by pumping water uphill, where it can later flow downhill to spin a generator. One experimental approach to such low-cost batteries is something called a "liquid" battery, which uses inexpensive battery materials that assemble themselves.


Even if problems with batteries are overcome in the lab, these technologies face obstacles to being commercialized. To drive down costs, battery makers are turning to applications other than electric vehicles and the grid to get new technologies off the ground, applications such as microelectronics, power tools, and race cars. Plug-in hybrids can also help serve as a bridge to electric vehicles. Plug-ins use back-up gas-powered generators to help extend their range, allowing automakers to use smaller, less expensive battery packs than they'd need for electric vehicles. Automakers such as GM, with its Chevrolet Volt due out this year, are taking this approach. The electric vehicles on sale now, and that will be going on sale in the next few years, are either expensive sports cars and luxury vehicles, where costs can be high, or their upfront costs are being decreased using creative financing, such as leasing battery packs or offering per-mile plans something like the per-minute plans offered by cell phone companies.

Sunday, December 19, 2010

Used Toshiba Laptops

Everyone knows the Toshiba brand and most people who have tried Toshiba's products like them. However, they may find them a bit expensive especially laptops. That's why many people are considering used Toshiba laptops as a way to save money.


When people hear the name Toshiba, they know that it is a product of Japan. Although most people know that many products nowadays, either branded or not, are mostly made in China but the quality of their product are protected by the company itself.


CLICK HERE TO FIND OUT HOW YOU CAN GET A FREE LAPTOP


Toshiba is a well known brand all over the world, and even when you say it is used, still people are willing to buy but in lower price since it is already used. Used Toshiba laptops are cheaper than a new ones.


There are different kinds of models of used Toshiba laptops to choose from.


The price will vary on what model laptop you like. Although not all models are cheap. It also depends on the model. But for the beginner, who wants to learn how to use a laptop computer a cheap used computer makes a good choice.


There are different kinds of used laptop that are for sale nowadays, some are branded ones and some are not. You all know that Toshiba is one of the leading brand or manufacturer that has good quality and good technology. And speaking of technology, Toshiba is one of the manufacturers that are constantly rated among the best.


Used laptops are not really as bad as what people think they are, sure it might not be shiny and new but it is a heck of a lot cheaper. Toshiba always guards their reputation regarding the quality of their products.


Thus, even if it is a used Toshiba laptop you can feel fairly confident that it still of good quality.


CLICK HERE TO FIND OUT HOW YOU CAN GET A FREE LAPTOP


You can buy used Toshiba laptop from their designated outlet so that you can still have their guarantee for the used laptop you buy. Used Toshiba laptops are good for students, offices and for home. It is more convenient to use and you can carry it everywhere you want. When you buy them from their designated outlet, you can be sure they have the quality control of their product. Then it would be (almost) as good as new.


What is important when you buy a used laptop is you have to be aware of the brand you want to buy and the quality control of the company towards their product. Just be sure that the used laptop that you are going to buy can satisfy your needs and budget. Always ask for warranty on the used laptop that you are going to buy.


If you want to see the different models of used laptops, you can go online and search for the used Toshiba laptop and with their designated price for them at one of the sites below.