scientific american - 1998 05 - six months in space

... M. Grossman in Austin, Tex. News and Analysis Scientific American May 1998 45 CYBER VIEW Bringing Down the Internet DAVID SUTER Copyright 1998 Scientific American, Inc. F or six months, at least ... pro- gram, including Hu Side, head of the Chinese Academy of Engineering Phys- ics, and his deputy Du Xiangwan. Both are “very strong arms-control advo- cates,” Cochran insists. A...

Ngày tải lên: 12/05/2014, 15:36

... are explained in terms of vi- brating strings. “The average physicist wasn’t into do- ing this —it was just so alien to them,” the 47-year-old 38 SCIENTIFIC AMERICAN MAY 2003 FOREST McMULLIN Profile Wired ... account. Relying on spam blockers has led to an es- calating e-mail-filtering arms race as UCE be- comes ever more evasive. Because construct- ing effective filters is time-consuming...

Ngày tải lên: 12/05/2014, 16:17

... exactly how angiogen- esis inhibitors work, angiostatin is ex- pected to be tested in humans begin- ning late this year. (Several synthetic an- giogenesis inhibitors are already in clinical trials.) When ... he calls intervention: establish- ing standards and then measuring per- formance against them. Another highly effective technique—having subordi- nates take part in the decision mak...

Ngày tải lên: 12/05/2014, 15:47

... aplomb. 34 SCIENTIFIC AMERICAN February 1993 RAYMOND GENDREAU Copyright 1993 Scientific American, Inc.Copyright 1993 Scientific American, Inc. ing to computers. A few scientists, in- cluding Stephen ... He also works on his violin playing and veg- etable gardening. Huse has been primar- ily interested in the theory of phase tran- sitions in various materials, including spin gl...

Ngày tải lên: 12/05/2014, 14:48

... NIAID an- nounced that it was Òaccelerating the tri- al design processÓ with the intention of starting clinical trials of convergent ther- apy during the spring. Initially the tri- als were to involve ... another way of maintaining a pa- tientÕs health until a cure can be found. The individual and combined side ef- fects of the drugs must also be taken into account. In all combination thera...

Ngày tải lên: 12/05/2014, 14:49

... primer walking. Their approach uses a library of hexamers (six- base primers) and a protein that binds to single-strand ge- nomic DNA. The binding protein pre- vents individual hexamers from pairing stably ... abundances of the original miner- als in the peridotite. Some minerals, such as clinopyroxene, melt more easi- ly than do others and hence rapidly de- crease in abundance during the...

Ngày tải lên: 12/05/2014, 14:54

... MILLION 1 IN 10 MILLION 1 IN 1 MILLION 1 IN 100,000 1 IN 10,000 Odds of any- thing happen- ing to only one person in the world at any time Odds of any- thing happen- ing to only one person in the ... Stix 1 IN 1 TRILLION CHANCE OF AN EVENT OCCURRING 1 IN 100 BILLION Woman be- ing killed by a husband or lover 1 IN 10 BILLION Drowning in a tub Being killed by lightnin...

Ngày tải lên: 12/05/2014, 15:01

... 1995 Scientific American, Inc. W hen computer diagnostician Angela Bennett (played by San- dra Bullock) disabled a main- frame computer with a virus-infected disk slipped into a Macintosh in this past ... com- pletely outside of it.Ó The whirring ma- chine splintered, spewing blood onto the walls, carpets and window, where it merged into the sunset. ÒI screamed again and again. Slowly th...

Ngày tải lên: 12/05/2014, 15:02

... technology. “Treating each systems acquisition as a separate [technological] solution,” Strassmann testified in a Senate hear- ing, “has resulted in thousands of unin- tegrated, hard-to-maintain, impossible- to-manage, ... Italy; telephone: 3 9-2 -7 60 0-1 104; fax: 3 9-2 -7 60 0-3 719. Further Reading Hidden Killers: The Global Problem with Uncleared Landmines: A Report on Inter...

Ngày tải lên: 12/05/2014, 15:08

... typically now made by a laborious hit-or- miss procedure that involves in- jecting genes into eggs and breed- ing the few animals that take up the genes. Cloning should expe- dite the rapid generation ... complica- tions and respi- ratory symp- toms. Neurologi- cal, psychiatric and ophthalmic diseases were also most preva- lent among the most heavily ex- posed. In an ac- companying pa- pe...

Ngày tải lên: 12/05/2014, 15:23