scientific american - 2000 06 - the birth of molecular electronics

... OOcceeaann FFlloooorr?? Molecular Electronics The Birth of Copyright 2000 Scientific American, Inc. Scientific American June 2000 37Profile Profile served specimen of one of the earliest di- nosaurs ever ... survey of the number of private companies in the business of small-arms production over the past four decades shows how the market expanded at the e...

Ngày tải lên: 12/05/2014, 16:03

... trade. The decline was reinforced by the social unrest of the late 1960s, which divided the supporters of civil rights. Furthermore, the economic crisis of the 1970s strengthened the hand of the more ... materials pro- vide some of the first insight into the lives of prehistoric women, children and the eld- erly —or, as Soffer describes them, the silent majo...

Ngày tải lên: 12/05/2014, 16:06

... absolutely firm in their convictions. And if you say to either one of them they’re wrong, then they start tuning you out.” So McNutt tries to make the 15-year-olds aware of the other’s position ... to one of the most beau- tiful spectacles in all of nature: a total eclipse of the sun. The two of us were among them. One of us (Phillips) watched from Bulgaria as the gla...

Ngày tải lên: 12/05/2014, 16:08

... each cycle of the AC Þeld. When the marble is hopping down the egg tray with the help of the AC Þeld, augmenting the av- erage tilt of the egg tray by increasing the DC voltage does not change the av- erage ... Kazumi Maki of the Universi- ty of Southern California and by the late John Bardeen of the University of Illi- nois, but it is too early to tell w...

Ngày tải lên: 12/05/2014, 14:54

... that they were the few Cretaceous survivors. The foundation of this theory began to shake in 1981, when fossils of Òop- posite birdsÓ were unearthed in China and, then, all over the Northern Hemi- sphere. ... Final cut, the size of the dress- ing room, or the hors dÕoeuvres avail- able for on-set snacking the point of power in Hollywood is to use it to exer- cise control....

Ngày tải lên: 12/05/2014, 15:01

... stunning movie of our watery planet. The spacecraft examined the outer expanses of the earthÕs magnet- ic Þeld and took the Þrst mea- surements of the moonÕs far side since the days of the Apol- lo program. ... returned to the earth over the low-gain antenna. Tape-search- 50 SCIENTIFIC AMERICAN December 1995 JAILBARS, slices of images taken of the asteroid...

Ngày tải lên: 12/05/2014, 15:03

... microorganisms. If the impact of urban agriculture con- tinues to broaden, the notion of the gar- den city the turn -of -the- century dream of urban centers lined with trees and or- namental plants —may ... surprising: they whip around the planet at up to 200 meters per second. Overall, however, data from the probe’s 57-min- ute descent did not chal- lenge the prevailing...

Ngày tải lên: 12/05/2014, 15:08

... dif- ferent risk factors may affect the expres- sion of the disorder,” the group con- cludes in the Journal of the American Medical Association. The lead author of the study, the larg- est of ... professor of psychology at the University of Liverpool, and other academics have ruffled a few well-groomed feathers in the staid linguis- tics community. Their gos-...

Ngày tải lên: 12/05/2014, 15:16

... traveling the interstate since the wee hours of the morn- ing and what they might say when they arrive at the Capitol and meet with their elected rep- resentatives. Most of his audi- ence probably ... or their distribution. In the Northeast, with its meadows and for- ests, they are abundant, but in the Mid- west, with its vast expanses of mono- culture crops, they are scarce...

Ngày tải lên: 12/05/2014, 15:26

... book presents an hour-by-hour, round -the- clock journal of your brain’s activities. Drawing on the treasure trove of information from Scientific American and Scientific American Mind magazines ... possible without the research and the articles of the many excellent contributors of Scienti c American and Scienti c American Mind: their work is in large part...

Ngày tải lên: 12/05/2014, 16:39