scientific american - 2000 05 - metallic hydrogen

... radio-frequency interconnects Is the end in sight for chip patterning by optical lithography? One-hundred-ninety-three-nanome- ter optical lithography (which can pro- duce transistors with 100-nanometer gates) ... Hewlett- Packard and other manu- facturers are betting can beat the problem. Avoiding a Data Crunch Making Metallic Hydrogen Making Metallic Hydrogen 84 58 By re-creating ex...

Ngày tải lên: 12/05/2014, 16:02

... and depression. Scientific American (ISSN 003 6-8 733), published monthly by Scientific American, Inc., 415 Madison Avenue, New York, N.Y. 1001 7-1 111. Copyright © 1993 by Scientific American, Inc. ... Canada 80 0-3 3 3-1 199; other 51 5-2 4 7-7 631. Postmaster: Send address changes to Scientific American, Box 3187, Harlan, Iowa 51537. Reprints available: write Repri...

Ngày tải lên: 12/05/2014, 14:49

... represents a one-in-a-million hazard, the point below which the cancer risk from a food additive is too small to be of concern to the Food and Drug Administration. Between –2 and –4 are one- of-a-kind ... Development Cor- poration, a Washington- based policy organiza- tion. ÒHe might achieve this objective through growth-enhancing poli- cies, but he might also increase taxes and en- gage in e...

Ngày tải lên: 12/05/2014, 15:01

... solution,” Strassmann testified in a Senate hear- ing, “has resulted in thousands of unin- tegrated, hard-to-maintain, impossible- to-manage, contractor-dependent is- lands of automation.” Because the law “does ... 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 International Dem...

Ngày tải lên: 12/05/2014, 15:08

... 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- per, the ... 1997 Scientific American, Inc. O n a warm and clear February afternoon, I am cruising southern California’s Foot- hill Freeway in a one-of-a-kind electric roadster. I’ve got the San Gabriel Moun-...

Ngày tải lên: 12/05/2014, 15:23

... some- body did that deliber- ately from a few dif- ferent points? This could be a massive denial-of-service at- tack on the Net —or an eavesdropping at- tack,” Bellovin said. This might be possi- ble, ... en- gineered Bt crops has been document- ed. But several pests have shown resistance in the laboratory, and a veg- etable pest, the diamond- back moth, has demon- strated resistance after in...

Ngày tải lên: 12/05/2014, 15:36

... its companion. Thus, x-ray bi- naries could be the best proof that stel- lar-mass black holes exist [see “The Search for Black Holes,” by Kip S. Thorne; Scientific American, De- cember 1974]. Taking ... x-rays. On the sixth day it began to blaze in x-rays. As shown by Jean-Marie Ha- meury of Strasbourg Observatory, Mc- Clintock, Narayan and me, the delay was exactly what is expected for two-...

Ngày tải lên: 12/05/2014, 15:57

... and its technol- ogy last July, the FAA gathered 24 ADS- B-equipped aircraft of various sizes (everything from a Boeing 757 and sev- eral 727s to a navy P-3 Orion and a sin- gle-engine Piper ... passenger-vehicle drivers are at fault in 70 percent of fatal crashes involving heavy trucks.In the most com- mon type —head- on collisions — passenger-vehi- cle drivers crossed the cen- ter line ......

Ngày tải lên: 12/05/2014, 16:01

... comfort of a well-es- tablished brand-name. —Paul Wallich News and Analysis 38 Scientific American February 2000 CYBER VIEW Your First $20 Free! DAVID SUTER Copyright 2000 Scientific American, Inc. The ... painstakingly sepa- rated thousands of salt-grain-size for- ams from their muddy mass grave us- ing a tiny paintbrush. Her search re- vealed that 55 percent of the species of deep-...

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... 22 ANTI GRAVITY C-A-T-T-T-T-T-T-T-T T he fog comes on little cat feet,” wrote Carl Sandburg. The great poet and historian may merely have been attempting to animate water va- por, but he presciently ... affirmation was short-lived. The back-to-back failures of the next two spacecraft, the $125-million Mars Climate Or- PAT RAWLINGS Copyright 2000 Scientific American, Inc. biter and the $16...

Ngày tải lên: 12/05/2014, 16:01