scientific american - 1996 05 - the comets'' lair

... Among the most com- mon mines in this group are the Italian scatterable mines TS-50 and SB-33 and the hand-laid VS-50 and VAR-40, the U.S made M14, and the Chinese Type 72. Typically, these weapons ... Space Adminis- tration unveiled the X-36 the first high-performance jet with no tail at all. Remotely controlled and powered by a cruise-mis- sile engine, the 5.4-meter-long, 600-...

Ngày tải lên: 12/05/2014, 15:08

... OGDEN Copyright 1995 Scientific American, Inc. SCIENTIFIC AMERICAN January 1996 31 easily destroyed. Moreover, some theo- rists raised certain technical objec- tions, namely, that the release of a pho- ton ... transform their experiment into the quantum eraser, the researchers tagged one of the photons of the pair (speciÞcally, the one created by the la- serÕs direct pa...

Ngày tải lên: 12/05/2014, 15:04

... 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 take on a new ... data from the probe’s 57-min- ute descent did not chal- lenge the prevailing hy- pothesis of the evolution of the solar system and its largest planet, according to Richard Young...

Ngày tải lên: 12/05/2014, 15:08

... users of conven- tional cellular phones. SA MICHAEL GOODMAN Copyright 1996 Scientific American, Inc. The Stellar Dynamo 46 Scientific American August 1996 Copyright 1996 Scientific American, Inc. ... nature show at the Web site whose address the produc- News and Analysis30 Scientific American August 1996 CYBER VIEW The Notworking Computer DAVID SUTER Copyright...

Ngày tải lên: 12/05/2014, 15:14

... protected under the executive order’s “state-of -the- art” tech- nology exemption to the bulk declassi - cation rule. But that introduces another concern. The issue is, what does state- of -the- art technology ... 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 s...

Ngày tải lên: 12/05/2014, 15:16

... though, the mothers bring them out into the open to join the rest of the pride. If any of the other females have cubs, they form a crèche and remain in near-con- stant association for the next year ... offered to them, some home owners will balk at the idea of selling their excess electricity at a dis- count to the local utility, which then re- sells the power for several ti...

Ngày tải lên: 12/05/2014, 15:23

... disrupting the signals between neurons. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. 28 SCIENTIFIC AMERICAN MAY 2004 I n the 18 years since they were dis- covered, high-temperature supercon- ductors ... what remains of the mess left by the Exxon Valdez. The oil compo- nents are poisoning the otters. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. www.sciam.com SCIENTIFIC AMERIC...

Ngày tải lên: 12/05/2014, 16:20

... inhibit candor when they are posed the ques- tion, ÒHow big is the diÝerence?Ó (Fur- ther, the work has not yet been peer-re- viewed or published, so the team re- mains quite cautious about the details.) Essentially ... DNA, the ruthenium-ribose combination revealed something extraordinary. The researchers examined the electri- cal properties of short lengths of dou- ble-helix...

Ngày tải lên: 12/05/2014, 15:01

... Utah Copyright 1996 Scientific American, Inc. T he turn-of -the- century stone building is rotting inside, floor- boards dusty and dilapidated, pigeons roosting in the eaves. There are no windows in the moldy ... leishmani- asis is being conducted, and the “pep- tideria,” where the synthesized peptides that form the basis of the malaria vac- cine are stored. He also points out...

Ngày tải lên: 12/05/2014, 15:18

... Biológica of Doñana-CSIC. At night, the animals leave the safety of the scrubs to hunt on the open lands and find themselves at the mercy of hounds unleashed by the poach- ers during their nocturnal ... badgers belonged to the five territories in Coto del Rey; the others resided within the core of the park, Reserve Biológica. Of the tagged bad- gers, the team recorded 13...

Ngày tải lên: 12/05/2014, 16:08