scientific american - 1995 05 - what found the top quark

... 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 ... SIMONS Copyright 1995 Scientific American, Inc. MAY 1995 $3.95 Clouds of tobacco smoke continue their spread, despite warnings. What found the top qu...

Ngày tải lên: 12/05/2014, 15:01

... 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. ... which of- ten intervene to control the price of their nationÕs cur- rency. In Mexico the central bank maintained the price of the peso within a narrow 36 SCIENTIFIC AMER...

Ngày tải lên: 12/05/2014, 15:01

... threat- ens to slow signiÞcantly the transition to less harmful substitutes in the U.S. Although oÛcials assert that they are on top of the situation, they admit they do not know the scope of the ... of the organizers is JeÝrey Gold- stein, a psychologist at Adelphi Univer- sity and president of the five-year-old Society for Chaos Theory in Psychology and the Life Sciences....

Ngày tải lên: 12/05/2014, 15:02

... on the X chro- mosome. The paper has been submit- ted to a journal. Elliot S. Gershon of the National In- stitute of Mental Health is now recruit- ing 100 pairs of gay brothers for a ge- netic-marker ... GOLTZ Copyright 1995 Scientific American, Inc. ond, but at the higher latitudes now being monitored, its speed changes abruptly to 750 kilo- meters per second. The bound- ary b...

Ngày tải lên: 12/05/2014, 15:02

... 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. These images re- vealed ... there are salps, the eÛciency of the transfer of carbon from the atmo- sphere to the deep sediments what we call the biological pumpÑis improved dramatically.Ó Once...

Ngày tải lên: 12/05/2014, 15:03

... 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 ... status reports. The DOE had no way of know- ing whether the project was on track. Agency managers could not even esti- mate the size of the new system. Never- theless, in Sep...

Ngày tải lên: 12/05/2014, 15:08

... 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 ... of generosity but, rather, fatigue. Cubs feed when their mothers return from hunt- ing (top) . If the mothers stay awake, they will not let cubs other than their own, such as the...

Ngày tải lên: 12/05/2014, 15:23

... strategies and the cost-benefit dimensions of what the response should be if they do one or the oth- er.” He concludes: “We have the evolved capacity to adopt either strategy.” These are hardly the words ... 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 record...

Ngày tải lên: 12/05/2014, 16:08

... 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 ... are cleaning up 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 S...

Ngày tải lên: 12/05/2014, 16:20

... betatron have the special advantage of produc- ing their greatest eÝect about 1 1 Ú 2 inch- es below the surface of the body. With X-ray therapy as used up to the present time, the eÝect is greatest on the ... the sur- face, and decreases with depth. Direct use of the high-speed electrons from the betatron may be even more valu- able than the use of the X-rays. Most of...

Ngày tải lên: 12/05/2014, 14:49