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2011年9月15日 星期四

How Silicon Solar Cells Are Produced

Homeowners considering residential solar installations are presented with a wide array of options.who was responsible for tracking down Charles China ceramic tile . When deciding what makes the most sense for a rooftop solar installation, price, efficiency and financing options should usually be the most important factors. Nonetheless, understanding the process by which solar panels are produced can prove interesting if not necessarily crucial to the decision to go solar.

At present, crystalline silicon solar panels comprise the vast majority of the solar installations, with roughly four-fifths of the market. Solarbuzz explains that these types of solar panels are composed of several dozen smaller solar cells soldered together.

Crystalline silicon solar cells are produced through two primary methods depending on the type of silicon being used.

Monocrystalline silicon solar cells are cut out of a single large crystal with a common grain.Enecsys Limited, supplier of reliable solar RUBBER MATS systems, The consistent internal structure of these crystals provides substantially higher conversion efficiency than most other types of solar panels, however, the process to create them is quite difficult, expensive and energy intensive. Molten silicon is kept at temperatures around 1,600 degrees Celsius for up to a few days as a so-called seed crystal is slowly dragged through the material as it cools.

Polycrystalline silicon is a less efficient material for solar panels,the Bedding by special invited artist for 2011, however, the process to produce these solar cells proves substantially easier than that for monocrystalline solar cells. While the silicon is similarly heated to a molten state, the material is then poured into a cast and allowed to cool. Without the slow seeding process, the material cools with an inconsistent structure that prevents electrons from reaching embedded conductors.

In both cases, once the cells are cut down to the appropriate size they go through a process of surface etches that seeks to maximize the amount of light absorbed, and then incorporated into solar panels.

Several developments have emerged to improve the efficiency of this manufacturing process. Scientific American reports on one Massachusetts Institute of TechnologOur oil painting reproduction was down for about an hour and a half,y that has attempted to created an incredibly fine mesh of low-cost silver to conduct converted electricity.

Technology Review notes that Suntech Power has adapted an old production technique that recently fell out of patent protection that allows for the creation of monocrystalline silicon through the same simple pour-and-cool process used for polycrystalline silicon. This method places seed crystals scattered throughout the mold, encouraging the silicon to cool with a consistent structure at least in certain place, with the less efficient material forming around the edges.

In early September, the Department of Energy offered a loan guarantee for a company that hopes to quickly freeze the molten silicon, then cut and etch it using laser, reducing the total time per solar cell to as little as 25 seconds.Save on kidney stone and fittings,

2011年4月7日 星期四

Packard Bell and Amiga Enter Android Tablet Fray

Two prominent names from the 90's PC era have entered the Android tablet game,

hoping  to grab a piece of the pie.  Amiga is rolling out a pair of Android 2.2

tablets in 7-inch and 10-inch variants, both of which can be purchased immediately.

According to the email we received, the 7-inch Xpedio 7 MT model will be nearly

identical to the Galaxy Tab with a 1GHz processor, 512MB RAM, and 16GB storage. At

$299 it will be a tough sell against the likes of Samsung, especially with its 800 x

480 resolution screen and 1.3-megapixel camera. The 10-inch version (Xpedio 10 MT)

looks to fetch $449 and should have the same internals save for its larger screen.

The picture you see above is said to be a stack of their tablets rolling off the

assembly line. Amiga promises that these tablets will see Honeycomb once Google

releases the code to all.

Currently, Amiga is donating at least $25 of each purchased tablet to relief efforts

in Japan and Haiti. Down the road, addition initiatives and schools will benefit

from the Amiga cause. All one has to do is enter Japan or Haiti in the promotional

code section when checking out with their purchase.

Packard Bell plans to offer a slightly more powerful experience with their new

Honeycomb-powered Liberty Tab. Hardware looks to feature a 10.1-inch display at

1280x800 with a 5-megapixel camera on back and 2-megapixel snapper on front. Other

details include an NVIDIA Tegra 2 chipset, USB ports, and support for Wi-Fi, 3G,

HDMI, Bluetooth, and GPS. Europeans can pick theirs up later this summer (June) in

either Pearl White or Cherry Red.