Do you know this galaxy?     

Waldrop MM 《Science (New York, N.Y.)》1988,239(4839):462

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Supernova 1987A: Facts and Fancies: Even though the supernova is fading now, the data continue to pour in; indeed, there are new installments yet to come     

Waldrop MM 《Science (New York, N.Y.)》1988,239(4839):460-462

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Anti-Idiotypes, Receptors, and Molecular Mimicry. D. Scott Linthicum and Nadir R. Farid, Eds. Springer-Verlag, New York, 1988. xii, 322 pp., illus. $65. From a symposium, Quebec, Canada, June 1986     

Sercarz E 《Science (New York, N.Y.)》1988,241(4867):852-853

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Growth in R&D Spending Slows: Economic woes, federal deficit pressures force Congress, Administration to curtail plans for expanding research programs     

Crawford M 《Science (New York, N.Y.)》1988,239(4835):12-13

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Has a Brown Dwarf Been Found at Last?: The evidence is not ironclad, but it is certainly the most convincing to date; if real, the implications could be cosmic     

Waldrop MM 《Science (New York, N.Y.)》1988,239(4835):23-24

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Seismic slip and down-dip strain rates in wadati-benioff zones     

Bevis M 《Science (New York, N.Y.)》1988,240(4857):1317-1319

The rate of accumulation of seismic moment in Wadati-Benioff zones is used to estimate strain rates in subducting slabs that are sinking through the asthenosphere. Between depths of 75 and 175 kilometers a typical down-dip strain rate is about 10(-15) per second, which implies that slabs in this depth range typically accumulate strain of order 10(-1). This result is in accord with geometrical arguments that subducted slabs must experience large membrane strains to deform to their observed shapes. Mantle seismicity (repeated catastrophic shear failure) is apparently a primary mechanism by which large membrane strains accumulate in the cold cores of subducting slabs. Slabs are penetratively deformed, and they have low flexural rigidity compared to oceanic plates at the earth's surface.  相似文献   

NASA Delays Space Telescope     

Waldrop MM 《Science (New York, N.Y.)》1988,241(4871):1281

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Taking Back the Night: The bad news is that the astronomical environment is steadily being degraded; the good news is that the astronomers have allies     

Waldrop MM 《Science (New York, N.Y.)》1988,241(4871):1288-1289

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The meadowcroft rockshelter     

Adovasio JM  Carlisle RC 《Science (New York, N.Y.)》1988,239(4841):713-714

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Dynamic properties of molecularly thin liquid films     

Israelachvili JN  McGuiggan PM  Homola AM 《Science (New York, N.Y.)》1988,240(4849):189-191

An experimental technique is described for simultaneously measuring the static and dynamic interactions of very thin liquid films between two surfaces as they are moved normally or laterally relative to each other. Film thickness can be measured and controlled to 1 angstrom. Initial results are presented of the transition in the physical properties of liquid films only one molecular layer thick to thicker films whose properties are practically indistinguishable from the bulk. In particular, the results show that two molecularly smooth surfaces, when close together in simple liquids, slide (shear) past each other while separated by a discrete number of molecular layers, and that the frictional force is "quantized" with the number of layers.  相似文献