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  • Nature Publishing Group  (5)
  • American Institute of Physics (AIP)  (3)
  • 1985-1989  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Three-dimensional structure of CheY, the response regulator of bacterial chemotaxis (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 745-749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Crystals of native S. typhimurium CheY protein were obtained using vapour diffusion techniques with ammonium sulphate as precipitant. The wild-type protein gave clusters of well-formed, elongated prisms at 1.8-2.0 M ammonium sulphate, pH4.5. The space group of the crystals was orthorhombic, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337745a0
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical studies on the femtosecond real-time measurement of ultrafast electronic decay in polyatomic molecules (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7184-7194 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a computer simulation of the real-time detection of ultrafast electronic decay dynamics in polyatomic molecules with femtosecond laser pulses. The intramolecular non-Born-Oppenheimer quantum dynamics is treated numerically exactly for a two-state three-mode vibronic coupling model representing the conically intersecting S1 and S2 excited states of pyrazine. The pump–probe signal is evaluated in lowest order perturbation theory with respect to the radiation–matter interaction by numerical integration over the pump and probe pulses. We discuss in some detail the dependence of the pump–probe signal on the properties of the laser pulses (frequencies and pulse durations). The calculations predict a dramatic (∼12 000 cm−1) and ultrafast (∼20 fs) red shift of the stimulated-emission signal as well as distinctive quantum beats in the pump–probe signal as a function of the delay time. Both effects are very pronounced and should therefore be relatively easily detectable experimentally. They are expected to be generic features of ultrafast internal-conversion processes in polyatomic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456248
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  • 3
    Electronic Resource
    Electronic Resource
    Computation of electrical conditions inside wire-duct electrostatic precipitators using a combined finite-element, finite-difference technique (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1799-1806 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An accurate and efficient numerical scheme is presented for calculating electrical conditions inside wire-duct electrostatic precipitators. A Galerkin finite-element method with quadratic interpolation is employed in solving Poisson's equation to yield the electric potential solution. A backward difference method is utilized to compute the space-charge density from the continuity equation. The two methods are iteratively applied until convergence criteria for electric potential and current density are met. Computed potential and electric field values show good agreement with analytic solutions and experimental measurements. Comparisons between the present scheme and a finite-difference scheme show that the finite-element method offers distinct advantages in predicting the electrical characteristics of precipitators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336402
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of oxygen precipitation on phosphorus diffusion in Czochralski silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 34-36 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of oxygen precipitation and surface films (SiO2 vs Si3N4) on P diffusion at 1100 °C in Czochralski silicon have been studied. With a fast precipitation rate, P diffusion under both kinds of films is enhanced because of the supersaturation of Si interstitials caused by oxygen precipitation. The larger enhancement in P diffusion under Si3N4 than that under SiO2 covered with Si3N4 is attributed to the slower recombination velocity of interstitials at the Si3N4/Si interface. P diffusion in a denuded zone behaves like that in float-zone Si until the interstitials generated under that zone arrive at the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100114
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  • 5
    Electronic Resource
    Electronic Resource
    Revised history of early Tertiary plate motion in the south-west Pacific (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 495-499 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Reanalysis of early Tertiary magnetic anomalies on the Pacific plate south of the Campbell Plateau indicates that in early Tertiary time there was a previously unrecognized triple junction of the Pacific, the Antarctic, and a third plate now beneath the Bellingshausen sea. Corresponding revised ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325495a0
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  • 6
    Electronic Resource
    Electronic Resource
    Pleistocene occupation in the south-east Queensland coastal region (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 618-621 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Wallen Wallen Creek site is located on the west coast of North Stradbroke Island (Fig. 1), on the outside footslope of the left-hand limb of a well-vegetated relict parabolic dune, and adjacent to an extensive fresh-water swamp formed by coastal progradation. The site has a surface elevation of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323618a0
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  • 7
    Electronic Resource
    Electronic Resource
    The physics of dense nuclear matter from supernovae to quark gluon plasma (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 319-324 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At high density, nuclear matter is better regarded as a dense fluid rather than a collection of individual protons and neutrons. A good understanding of the properties of nuclear matter, important in the physics of neutron stars and the Big Bang as well as heavy atomic nuclei, is now ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337319a0
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  • 8
    Electronic Resource
    Electronic Resource
    Relative motions of hotspots in the Pacific, Atlantic and Indian Oceans since late Cretaceous time (1987)
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 587-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Combinations of global plate reconstructions reveal average velocities for the last 50 to 65 million years of 10 to 20 mm yr−1 between the Hawaiian hotspot and those beneath Iceland, Tristan da Cunha, Réunion, St. Paul's Island, and Kerguelen. Therefore hotspots do not ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/327587a0
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