The biggest drawback of most portable electronic devices, such as notebooks, cellphones, PDAs and many others is the fact that they become useless after the rechargeable batteries completely discharge.Unfortunately, the devices themselves have known huge developments, while their batteries remain a source of discont... |
16 July 2007
11:07 GMT |
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A mathematical definition of the sphere says it is a perfectly symmetrical geometrical object, the set of all points in three-dimensional space which are at the same distance from a fixed point in space. The problem is that on the nanoscale, there is no such thing as a perfect sphere.The ideal sphere will touch a fl... |
15 June 2007
15:16 GMT |
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The fastest enterprise hard disks spin at 15,000 RPM, and can achieve sequential media transfer speeds of up to and beyond 110 MB/s.Modern hard drives use the spinning motion of a disk to move magnetic regions past a component that can read and change the data encoded on these regions. They record data by magnetizing... |
12 May 2007
05:24 GMT |
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In nature, different structures have different attitudes toward water, according to their chemical composition and geometry. Some are hydrophilic (they attract water molecules) and some hydrophobic (they repel them). But so far, no material has been known to be able to shift between the two states.Now, scientists at... |
12 May 2007
03:43 GMT |
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