scientific american - 1999 02 - a fractual walk down wall street
scientific american - 1999 02 - a fractual walk down wall street
... undeniable. Pervez Hoodbhoy, a physicist at Quaid-E-Azam University in Islamabad, Pakistan, argues that because early- warning systems are untenable, India or Pakistan can protect their command- and-control ... Di- pankar Bhattacharya of the Raman Research Institute in Supersoft X-ray Stars and Supernovae Scientific American February 1999 49 COMPACT STARS have colossal escape velociti...
Ngày tải lên: 12/05/2014, 15:53
A random walk down wall street
... particularly appropriate that I emphasize the usual caveat that the above-named individuals are blameless for any errors of fact or judgment in these pages. Many have warned me patiently and ... was provided by Barbara Johnson, Barbara Mains, Kay Kerr, Pia Ellen, Claire Cabelus, and especially Phyllis Durepos. Donald Lamm, Robert Kehoe, and Deborah Makay continued to make my association ....
Ngày tải lên: 05/05/2014, 18:14
scientific american - 2003 02 - starquake on a magnetar
... claims can be partly overcome by aggregating harm done over a large span of space and time, con- tends David Grossman, a recent graduate of Yale Law School and now a law clerk in An- chorage. In a paper ... This and other statistical properties are a hallmark of self-organized criticality, whereby a composite sys- tem attains a critical state in which a small perturbation can...
Ngày tải lên: 12/05/2014, 16:16
scientific american - 1993 02 - beating resistance in superconductors
... industrialized nation. In Ethiopia, water is already so scarce that some women walk miles to Þnd it and lug it home (bottom). AVAILABLE WATER 1990 2025 NIGERIA PERU SAUDI ARABIA SOMALIA SOUTH AFRICA TANZANIA TUNISIA ALGERIA CYPRUS EGYPT ETHIOPIA HAITI IRAN ISRAEL JORDAN KENYA LEBANON LIBYA MOROCCO WATER ... population growth will cut in half the amount of cropland available per capita by 2...
Ngày tải lên: 12/05/2014, 14:48
scientific american - 1994 02 - do aerosols slow climatic warming
... newest aircraft types: the F-117 Stealth Þght- ers, F-15s and F-16sÑAmericaÕs top-of- the-line ÞghtersÑand the sturdy A- 10 ground-attack airplane. Marine and navy aviation units will augment ... cyclosporine is a natural product that blocks an intracellular signaling pathway, as is the experimental immu- nosuppressant FK506. Ariad Pharma- ceuticals in Cambridge, Mass., a com- pany speci...
Ngày tải lên: 12/05/2014, 14:50
scientific american - 1995 02 - bubbles turn sound into light
... The AKF has a data- base that combines on-site surveys and satellite data into a Koala Habitat Atlas. It has begun to provide both a census and an assessment of how much koala living space has ... there involves at least a year and a half of SCIENTIFIC AMERICAN February 1995 41 PARTHA S. DASGUPTA, who was educated in Varanasi, Delhi and Cambridge, is Frank Ramsey Professor of Ec...
Ngày tải lên: 12/05/2014, 15:00
scientific american - 1995 08 - a new theory of aids latency
... coastal areas, ancient and modern data suggest we may be in a madhouse again. ÑChristina Stock R arely has a medical journal pub- lished so dramatic an erratum. A recent issue of Pediatrics de- scribed ... on. SCIENTIFIC AMERICAN August 1995 45 PHILIP MORRISON at Los Alamos Labo- ratory in 1945. LOS ALAMOS NATIONAL LABORATORY (INSET)UPI/BETTMANN ATOMIC SCIENTISTS gather at a base...
Ngày tải lên: 12/05/2014, 15:01
scientific american - 1996 02 - saving malnourished minds
... New Zealanders soon noticed RCDÕs potential as an anti- rabbit agent, and the Australia and New Zealand Rabbit Calicivirus Dis- ease Program was born. Funded by the Commonwealth Science and Industry ... Scien- tiÞc American, 415 Madison Avenue, New York, NY 1001 7-1 111, fax (212) 98 0-8 175 or call (800) 77 7-0 444. ScientiÞc American- branded products available. For free catalogue,...
Ngày tải lên: 12/05/2014, 15:04
scientific american - 1997 02 - found - 1,000 galaxies
... care about Tanzania,” she states emphatical- ly. “I care about Tanzania, I care about Tanzanians. But I am not a Tanzanian. I won’t stay there forever. And it needs to be in the hands of the nationals.” So ... suggests the Tanzanians have an unflappable ally. The daughter of academics, Moehl- man grew up first on a farm in Iowa and then in the countryside near Austin, Tex., and was always o...
Ngày tải lên: 12/05/2014, 15:20
scientific american - 1998 02 - wrapping up the universe
... interest a major appliance manufac- turer, which has a license to incorporate the resonator as a compressor in house- hold refrigerators. —Philip Yam News and Analysis26 Scientific American February ... genes that play a role in neurofibromatosis and Huntington’s disease as well as the rar- er ataxia telangiectasia and multiple en- docrine neoplasia type 1. In 1993, after turning...
Ngày tải lên: 12/05/2014, 15:33