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  • 1995-1999  (51)
  • 1955-1959  (16)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Coal Desulfurization in a Fluidized Carbonizer (1958)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 50 (1958), S. 24-26 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50577a027
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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Size-controlled percolation pathways for electrical conduction in porous silicon (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 393 (1998), S. 443-445 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Silicon shows photo- and electroluminescence at visible wavelengths when chemically etched into a microporous network of ‘wires’ several nanometres thick. This raises the possibility of a silicon-based optoelectronic technology. The luminescence properties may be understood on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/30924
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  • 8
    Electronic Resource
    Electronic Resource
    Geomagnetic Micropulsations (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 381-381 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The same data were then taken and the amplitude of every fluctuation divided by the Kp index at the time the observation was made. Plots were drawn of XfKp, Y/Kp and Z\KV against T. There was a very considerable reduction in the scatter, which was further reduced if local K indices (instead of Kp) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183381a0
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  • 9
    Electronic Resource
    Electronic Resource
    The Thermal History of the Earth (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 155-157 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ABOUT two years ago, a detailed study of the thermal history of the Earth was begun at the University of Toronto. First results of this investigation have been presented at several meetings1. It should be emphasized that this study does not pretend to have determined the temperature and heat-flow ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177155a0
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Altitude on the Position of the Magnetic Pole (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 35-36 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to trace any movement of the magnetic pole with increasing height, the above calculations were repeated on a much finer grid in the vicinity of the pole. Thus X, Y and H were computed for values of cos θ = 0.958, 0.962, 0.966, 0.970, 0.974 and 0.978, and φ = 256, 257, 258, 259 and 260 E. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/178035b0
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