For example, Benjamin and Matt were trying to construct a rectangle with an area equal to their heart's area of 29 square centimeters
. They had seen their classmates construct 6-centimeter-by-5-centimeter rectangles to get an area of 30 square centimeters
and 4-centimeter-by-7-centimeter rectangles to get an area of 23 square centimeters
, but they still were having difficulties.
The yield for these dual catalyst nanotubes was 163 parts per million hydrocarbons an hour for each square centimeter
24 Nature that a carbon nanotube array just 1 square centimeter
in area can make about 10 meters of yarn.
It's working with novel electrode arrays that may eventually permit densities of nearly a trillion transistors per square centimeter
, which would be like packing the circuitry of tens of thousands of Pentium chips into the space that one chip now occupies.
Ultrasonic transducers for medical imaging operate at very low intensity, applying a power of about one-tenth of a watt per square centimeter
. That's just 10 percent of the average power of sunshine at Earth's surface.
At present, the maximum amount of current per cross-sectional area, or critical current density, of BSCCO--roughly 70,000 amperes per square centimeter
(A/[cm.sup.2]) at -196 [degrees] C-- is about three times what it was 4 years ago, he says.
Pioneer 34R07 also seemed benign in lab tests, the researchers report, even at concentrations of 10,000 pollen grains per square centimeter
. That's 40 times as dense as the heaviest dusting researchers observed in the field.
Today's CD-ROMs squeeze 100 million bits into each square centimeter
of recording surface.
In the new studies, researchers made ions by using moderately intense laser beams, several hundred trillion to a quadrillion watts per square centimeter
. They fired the lasers at jets of cold atoms for up to 220 femtoseconds ([10.sup.-15] second).