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batterybase (ibatterybase) wrote,
@ 2009-09-17 22:32:00

HP Pavilion dv8000 Battery

Normally, the light-detecting diodes on a chip are arranged in a regular grid—say 1,000 pixels by 1,000 pixels.Hp laptop battery A picture is snapped and each diode records the light hitting it. A computer in the camera then runs complex computations to compress the image so that instead of taking up 10 hefty megabytes, it might only take up 100 kilobytes. The common picture type "JPEG," used on the Web and on many cameras and phones, is an example of this. This compression, unfortunately, takes a tremendous amount of computing power, and hence battery power

Ignjatovic and Bocko of the Department of Electrical and Computer Engineering, came up with a way to make the physical layout of the light-sensitive diodes simplify the computation. The normal way to perform compression includes a computation called the discrete cosine transform, which checks how much a segment of an image resembles a series of cosine waves. Both the image and the cosine waves are sampled at regular intervals and the transform requires that the image and cosine wave samples be multiplied together and added. Since the cosine wave samples can have a value anywhere between -1and +1,Pavilion dv8000 Battery(hp dv8000 battery), HSTNN-DB20 Battery, 395789-001 Battery, 396008-001 Battery, the computation requires multiplication by non-integers, which demands the bulk of the computing power

But Ignjatovic and Bocko have laid out the pixels to lie at the peaks of cosine waves resulting in a non-uniformly distributed array, instead of an evenly spaced one.Pavilion dv8000 Battery(hp dv8000 battery), By using this trick, the amount of computation required to compress the image is slashed by nearly five-fold. Since each pixel is positioned exactly where each cosine wave has a peak where the cosine value is "one," multiplying by one is unnecessary. With no multiplication and only a little addition, the processor uses less powerhp pavilion ze2000 battery , hp presario m2000 battery.

The team members are now looking to build a prototype chip that incorporates both technologies into a single unit to see how much real-world processing power the designs will save. They plan to integrate the technology into wireless security cameras at first.

"Wireless security cameras offer the perfect proving ground for these technologies," says Bocko.HSTNN-DB20 Battery, "These cameras need to capture, compress, and transmit high quality images as quickly as they can without consuming precious battery power. As we develop the chips further, we'll look more into consumer cameras and cell phones to see how much battery and processing power we can save them as well 417066-001,hstnn-lb31,411462-421."

A critical advantage of the new battery technology is lifespan: "If you're going to implant these things,Pavilion dv8000 Battery(hp dv8000 battery), HSTNN-DB20 Battery, 395789-001 Battery, 396008-001 Battery, you want a (battery) lifetime of at least 10 years," says West, whose organosilicon batteries are projected to power the tiny implantable devices dell xps m1530 battery for more than 12 years.

In addition to implantable devices for medicine, lithium batteries are used in scores of applications, from spacecraft to iPods.

Patented through the Wisconsin Alumni Research Foundation, the new organosilicon compound technology is also being developed through a new start-up company, Polyron, Inc. The work to develop the new organosilicon compounds was funded by the National Institute of Standards and Technology, 395789-001 Battery,a federal technology agency that works with industry to develop and apply technology, measurements and standards as07b72, acer aspire 5520 battery , acer aspire 5520g battery.

In the article, C&EN Senior Editor Alexander H. Tullo notes that polymer membranes are already an essential component of lithium ion batteries that power iPods, laptop computers, and other portable electronic devices. These porous, hair-thin separators control the flow of electrons through the hp business notebook nc4200 battery. Their failure can result in overheating and even fires. Such problems have recently prompted the widespread recall of millions of lithium ion batteries.

Tullo points out that lithium ion batteries will need to be bigger, safer, and more powerful if they are to be used effectively in motor vehicles. For that purpose, improved polymer separators are needed.

Recently, battery manufacturers have stepped up to this challenge by developing new polymer separators with greater porosity for improved power flow and stronger insulation materials for improved safety.Pavilion dv8000 Battery(hp dv8000 battery), HSTNN-DB20 Battery, 395789-001 Battery, 396008-001 Battery, At least one manufacturer is already using a new type of polymer separator in a new line of electric vehicles, 396008-001 Battery, while other advanced polymers are making their way through the development pipeline, according to the article. "The reality of driving to work under electric power may only be a hair away," Tullo says gw240,dell inspiron 1525 battery,dell inspiron 1526 battery.

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