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  • 1
    Electronic Resource
    Electronic Resource
    A numerical study of Richtmyer–Meshkov instability driven by cylindrical shocks (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 10 (1998), S. 974-992 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As an incident shock wave hits a material interface between two fluids of different densities, the interface becomes unstable. Small disturbances at the interface start to grow. This interfacial instability is known as a Richtmyer–Meshkov (RM) instability. It plays an important role in the studies of inertial confinement fusion and supernova. The majority of studies of the RM instability were in plane geometry—namely, plane shocks in Cartesian coordinates. We present a systematic numerical study of the RM instability driven by cylindrical shocks for both the imploding and exploding cases. The imploding (exploding) case refers to a cylindrical shock colliding with the material interface from the outside in (inside out). The phenomenon of reshock caused by the waves reflected from the origin is also studied. A qualitative understanding of this system has been achieved. Detailed studies of the growth rate of the fingers at the unstable interface are presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869624
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  • 2
    Electronic Resource
    Electronic Resource
    Wavelength dependence of 4-dimethylamino-4′-nitrostilbene polymer thin film photodegradation (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 912-914 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The polymeric electro-optical stilbene material, 4-dimethylamino-4′-nitrostilbene (DANS), was illuminated at wavelengths ranging from the visible to near-infrared in order to quantify its photodegradation processes. Photodegradation due to one-photon and two-photon absorption was studied. The quantum efficiency of the chromophore degradation is found to be strongly wavelength and absorption mechanism dependent. This suggests that, in different regions of the spectrum, different excited states or different mechanisms are involved in the degradation process. In the near-infrared spectral region, operation lifetimes of electro-optic devices made from this chromophore are expected to be around only few hundreds hours, dramatically shorter than it was previously believed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122035
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  • 3
    Electronic Resource
    Electronic Resource
    A two-phase flow model of the Rayleigh–Taylor mixing zone (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 816-825 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Rayleigh–Taylor instability of an interface separating fluids of distinct density is driven by an acceleration across the interface. Low order statistical moments of fluctuating fluid quantities characterize the hydrodynamics of the mixing zone. A new model is proposed for the momentum coupling between the two phases. This model is validated against computational data for compressible flows, including flows near the incompressible limit. Our main result is a zero parameter first order closure for ensemble averaged two phase flow equations. We do not, however, fully solve the closure problem, as the equations we derive are missing an (internal) boundary condition along any surface for which either phase goes to zero volume fraction. In this sense, the closure problem is reduced from a volume to a surface condition, rather than being solved completely. We compare two formulations of the statistical moments, one based on two phase flow and the other on turbulence models. These formulations describe different aspects of the mixing process. For the problem considered, the two phase flow moments appear to be preferable, in that they subsume the turbulence moments but not conversely. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868863
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  • 4
    Electronic Resource
    Electronic Resource
    General properties of a multilayer stratified fluids system (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1167-1181 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Linearized Euler equations of a general stationary multiple layer stratified system for both compressible and incompressible inviscid fluids are analyzed. The main result is that many features of a multilayer system are universal, in the sense they do not depend on such details as the number of layers, their thicknesses, equations of state for the fluids, and equilibrium density distributions. Necessary and sufficient conditions of stability are determined. For compressible fluids, it is possible for the system to be unstable even if there is no density inversion anywhere. It is shown that a compressible system is always more unstable than the corresponding incompressible one. A universal upper bound for the growth rate for a given perturbation wave number is given. General Rayleigh–Taylor unstable modes are characterized, and the range of unstable wave numbers is determined. Properties of stable modes are discussed. Numerical algorithms for solving the eigenvalue problem of the set of linearized Euler equations are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858602
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  • 5
    Electronic Resource
    Electronic Resource
    A renormalization group scaling analysis for compressible two-phase flow (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2929-2937 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Computational solutions to the Rayleigh–Taylor fluid mixing problem, as modeled by the two-fluid two-dimensional Euler equations, are presented. Data from these solutions are analyzed from the point of view of Reynolds averaged equations, using scaling laws derived from a renormalization group analysis. The computations, carried out with the front tracking method on an Intel iPSC/860, are highly resolved and statistical convergence of ensemble averages is achieved. The computations are consistent with the experimentally observed growth rates for nearly incompressible flows. The dynamics of the interior portion of the mixing zone is simplified by the use of scaling variables. The size of the mixing zone suggests fixed-point behavior. The profile of statistical quantities within the mixing zone exhibit self-similarity under fixed-point scaling to a limited degree. The effect of compressibility is also examined. It is found that, for even moderate compressibility, the growth rates fail to satisfy universal scaling, and moreover, increase significantly with increasing compressibility. The growth rates predicted from a renormalization group fixed-point model are in a reasonable agreement with the results of the exact numerical simulations, even for flows outside of the incompressible limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858701
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  • 6
    Electronic Resource
    Electronic Resource
    Small amplitude theory of Richtmyer–Meshkov instability (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 1856-1873 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents a new analysis of small amplitude Richtmyer–Meshkov instability. The linear theory for the case of reflected rarefaction waves, a problem not treated in previous work, is formulated and numerically solved. This paper also carries out a systematic comparison of Richtmyer's impulsive model to the small amplitude theory, which has identified domains of agreement as well as disagreement between the two. This comparison includes both the reflected shock and reflected rarefaction cases. Additional key results include the formulation of criteria determining the reflected wave type in terms of preshocked quantities, identification of parameter regimes corresponding to total transmission of the incident wave, discussion of an instability associated with a rarefaction wave, investigation of phase inversions and the related phenomenon of freeze-out, and study of the sensitivity of the numerical solutions to initial conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868245
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear theory of unstable fluid mixing driven by shock wave (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 1106-1124 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A shock driven material interface between two fluids of different density is unstable. This instability is known as Richtmyer–Meshkov (RM) instability. In this paper, we present a quantitative nonlinear theory of compressible Richtmyer–Meshkov instability in two dimensions. Our nonlinear theory contains no free parameter and provides analytical predictions for the overall growth rate, as well as the growth rates of the bubble and spike, from early to later times for fluids of all density ratios. The theory also includes a general formulation of perturbative nonlinear solutions for incompressible fluids (evaluated explicitly through the fourth order). Our theory shows that the RM unstable system goes through a transition from a compressible and linear one at early times to a nonlinear and incompressible one at later times. Our theoretical predictions are in excellent agreement with the results of full numerical simulations from linear to nonlinear regimes. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869202
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  • 8
    Electronic Resource
    Electronic Resource
    Solution structure of a protein inhibitor of neuronal nitric oxide synthase (1998)
    [s.l.] : Nature America Inc.
    Nature structural biology 5 (1998), S. 965-969 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The structure of the neuronal nitric oxide synthase inhibitory protein, PIN (protein inhibitor of nNOS), has been determined by NMR spectroscopy. Two N-terminal antiparallel α-helices pack against a four-stranded antiparallel β-sheet in the C-terminal region of the protein, forming a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2940
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  • 9
    Electronic Resource
    Electronic Resource
    Solution structure of the extended neuronal nitric oxide synthase PDZ domain complexed with an associated peptide (1999)
    [s.l.] : Nature America Inc.
    Nature structural biology 6 (1999), S. 417-421 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The PDZ domain of neuronal nitric oxide synthase (nNOS) functions as a scaffold for organizing the signal transduction complex of the enzyme. The NMR structure of a complex composed of the nNOS PDZ domain and an associated peptide suggests that a two-stranded β-sheet C-terminal to the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/8216
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  • 10
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    Study of the effects of metalloid elements (P, C, B) on Fe-based amorphous alloys by ab initio molecular dynamics simulations (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-11
    Description: In order to understand the effects of the metalloid elements M (M: P, C, B) on the atomic structure, glass formation ability (GFA) and magnetic properties of Fe-based amorphous alloys, Fe 80 P 13 C 7 , Fe 80 P 14 B 6 and Fe 80 B 14 C 6 amorphous alloys are chosen to study through first-principle simulations in the present work. The atomic structure characteristic of the three amorphous alloys is investigated through the pair distribution functions (PDFs) and Voronoi Polyhedra (VPs) analyses. The PDFs and VPs analyses suggest that the GFA of the three alloys dropped in the order of Fe 80 P 13 C 7 , Fe 80 P 14 B 6 , and Fe 80 B 14 C 6 , which is well consistent with the experimental results. The density of state (DOS) of the three amorphous alloys is calculated to investigate their magnetic properties. Based on the DOS analysis, the average magnetic moment of Fe atom in Fe 80 P 13 C 7 and Fe 80 P 14 B 6 amorphous alloys can be estimated to be 1.71 μ B and 1.70 μ B , respectively, which are in acceptable agreement with the experimental results. However, the calculated average magnetic moment of Fe atom in Fe 80 B 14 C 6 amorphous alloy is about 1.62 μ B , which is far less than the experimental result.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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