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  • 1995-1999  (51)
  • 1960-1964  (25)
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  • 1
    Electronic Resource
    Electronic Resource
    Continental Drift (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 231-232 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is a very real problem to find sources of heat beneath the ocean floors. The whole of the observed continental heat flow could be produced by the uranium, thorium and potassium contained in about 25 km. of granite. Granitic type rocks are almost completely absent under the oceans typical oceanic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185231b0
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  • 2
    Electronic Resource
    Electronic Resource
    Temperatures within the Earth's Core (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 521-522 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The only estimate of the melting-point temperature in the mantle is that due to U ±en6, who obtained a value of 5,000 K. at the core-mantle boundary. With the low melting-point temperatures in the core as indicated by Strong it is worth reconsidering the early history of the Earth's ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185521a0
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  • 3
    Electronic Resource
    Electronic Resource
    Geomagnetic Micropulsations With Periods 0.3-3 sec. (‘Pearls’) (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 641-643 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GEOMAGNETIC micropulsations of nearly sinu-VJ soidal shape and with periods ranging from about 0-3 to 3 sec. have been called 'pearls'. The wave-trains usually exhibit beats-the envelope of a saquence of oscillations resembling a necklace of oval pearls. It is because of this resemblance that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194641a0
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the Concentration of Myxoviruses and of Some Specific Antisera, based on Neuraminidase Activity (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 334-336 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have devised a method for determination of myxovirus concentrations, based on the enzymic activity of the virus particles. The action of the virus enzyme-its ability to destroy the haemagglutination-inhibitory capacity of some mucoproteins or to elute the virus from red blood cells-always leads ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189334a0
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  • 5
    Electronic Resource
    Electronic Resource
    A round turbulent jet produced by an oscillating diaphragm (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2484-2495 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A round turbulent water jet produced normal to, and at the center of a submerged, resonantly driven diaphragm is investigated experimentally. The jet which is formed without mass injection and is comprised entirely of radially entrained fluid, is present only when the excitation amplitude exceeds a given threshold. Above this excitation level, a small cluster of cavitation bubbles appears near the center of the diaphragm. The bubbles grow, apparently collapse, and then disappear during each oscillation cycle. It is conjectured that the jet is synthesized by time-periodic coalescence of vortex rings that are produced by secondary flow around the bubbles or by the collapse of the bubbles. It is remarkable that even though the jet results from a strong time-periodic excitation and its time-periodic features are detected throughout the present range of measurements, the time-averaged jet structure is similar to that of a conventional turbulent round jet in that the increase in its width and in the inverse of its centerline velocity are both linear functions of the distance from the actuator. In contrast to conventional jets, the present synthetic jets can be manipulated on relatively short time scales that are comparable to the excitation period. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869040
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental study of incompressible Richtmyer–Meshkov instability (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 405-415 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Richtmyer–Meshkov instability of a two-liquid system is investigated experimentally. These experiments utilize a novel technique that circumvents many of the experimental difficulties that have previously limited the study of Richtmyer–Meshkov instability. The instability is generated by vertically accelerating a tank containing two stratified liquids by bouncing it off of a fixed coil spring. A controlled two-dimensional sinusoidal initial shape is given to the interface by oscillating the container in the horizontal direction to produce standing waves. The motion of the interface is recorded during the experiments using standard video photography. Instability growth rates are measured and compared with existing linear theory. Disagreement between measured growth rates and the theory are accredited to the finite bounce length. When the linear stability theory is modified to account for an acceleration pulse of finite duration, much better agreement is attained. Late time growth curves of many different experiments seem to collapse to a single curve when correlated with the circulation deposited by the impulsive acceleration. A theory based on modeling the late time evolution of the instability using a row of vortices is developed. The growth curve given by this model has similar shape to those measured, but underestimates the late-time growth rate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868794
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  • 7
    Electronic Resource
    Electronic Resource
    A membraneless experiment for the study of Richtmyer–Meshkov instability of a shock-accelerated gas interface (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 3078-3085 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previous Richtmyer–Meshkov instability experiments carried out in shock tubes have been hampered by the need to separate the two gases with a thin plastic membrane. As a result, many of these experiments have had poor agreement with the linear stability theory of Richtmyer [Commun. Pure Appl. Math. 23, 297 (1960)]. This limitation has been removed in the present investigation by the use of a novel technique in which the interface is formed by flowing light (N2) and heavy (SF6) gases from opposite ends of a vertical shock tube. Both gases exit the shock tube through slots in the test section walls leaving behind a flat motionless interface which is then given a sinusoidal initial shape by gently oscillating the shock tube at a prescribed frequency in the horizontal direction. A weak shock wave (Ms=1.10), generated in the shock tube, impacts the interface and produces the instability. Photographs of the interface, which is visualized by seeding the heavy gas with a water droplet fog and illuminating it with a strobe light source, provide particularly clear views of the developing instability far into the nonlinear regime. In addition, amplitude measurements obtained from these photographs are found to be in good agreement with Richtmyer's theory. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869416
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  • 8
    Electronic Resource
    Electronic Resource
    The Earth’s inner core (1997)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Earth’s inner core has been the focus of much attention in recent years — its evolution, when it began to form and how quickly it grew, and what role it plays in the generation and reversals of the Earth’s magnetic field. It has also been found that it is elastically anisotropic and, even more surprisingly, that it is rotating faster than the rest of the Earth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.1997.d01-17.x
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  • 9
    Electronic Resource
    Electronic Resource
    Some Characteristics of Geomagnetic Micropulsations ( Pc ) (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 285-287 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A DETAILED investigation1 has been carried out on geomagnetic micropulsations recorded by rapid-run magnetograms during the International Geophysical Year (1957-1958), from seventeen observatories as widely distributed geographically as possible (see Table 1). The results from these seventeen ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/188285a0
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  • 10
    Electronic Resource
    Electronic Resource
    trans-Dichloro(hemiporphyrazinato)tin(IV) (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 32-33 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198011408
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