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  • 1
    Electronic Resource
    Electronic Resource
    AN AUTOMATED METHOD FOR DETERMINATION OF TERRAMYCIN (1960)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 87 (1960), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1960.tb23243.x
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  • 2
    Electronic Resource
    Electronic Resource
    Large-Scale Motions of Ionized Calcium in the Atmosphere of A Giant Star (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 990-992 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE star 31 Cygni, magnitude 4-0, was announced1 in 1898 as having a composite spectrum, and was later found by W. W. Campbell2 to be a spectroscopic binary. In 1936 W. H. Christie3 obtained an approximate spectrographic orbit for the brighter component, and in 1944 Miss Vinter Hansen4 published a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169990a0
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  • 3
    Electronic Resource
    Electronic Resource
    Solitary waves as fixed points of infinite-dimensional maps for an optical bistable ring cavity: Analysis (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 63-85 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The transverse behavior of a laser beam propagating through a bistable optical cavity is investigated analytically and numerically. Numerical experiments that study the (one-dimensional) transverse structure of the steady state profile are described. Mathematical descriptions of (i) an infinite-dimensional map that models the situation, (ii) the solitary waves that represent the transverse steady state structures, (iii) a projection formalism that reduces the infinite-dimensional map to a finite-dimensional one, and (iv) the theoretical analysis of this reduced map are presented in detail. The accuracy of this theoretical analysis is established by comparing its predictions to numerical observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528136
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  • 4
    Electronic Resource
    Electronic Resource
    Experiments on the instabilities of a swirling jet (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 263-276 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Instabilities present in a swirling jet in the Reynolds number range from 20 000 to 60 000 and a nominal swirl number of 0.5 were studied experimentally, using smoke visualization, hot-wire anemometry and acoustic excitation. Flow visualization photographs of the natural jet show vortex breakdown at the core and rolling up of the shear layer around the jet into weak, irregular, large-scale organized structures. When forced by acoustic excitation these structures became energetic and periodic. Axisymmetric and helical instability waves in the Strouhal number range 0.75 to 1.5 were excited and their evolution along the axial direction were measured from velocity spectra and ensemble averaged measurements. Compared to a nonswirling jet, the overall growth of the instability waves is considerably smaller, and vortex pairing is suppressed in a swirling jet. However, the overall spread and mass entrainment rates are higher in the latter. Measurements of the mean velocity components and turbulence fluctuations show that the vortex breakdown affects the axial velocity distribution and rapidly replaces the potential core with a large amount of turbulence. Upon interacting with the vortex breakdown, the shear layer along the jet periphery loses its organized structure and, in general, "random turbulence'' follows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868074
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  • 5
    Electronic Resource
    Electronic Resource
    Some notes on periodic Beltrami fields in Cartesian geometry (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 797-804 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Some mathematical facts about Beltrami fields, which are time-independent solutions of the three-dimensional incompressible Euler equations with nontrivial helicity, are assembled. The linearization about an arbitrary, fixed Beltrami field is studied in a Hamiltonian framework. A factorization of this linearization is introduced and used to characterize null spaces for Beltrami fields with ergodic streamlines. An interesting property of unstable modes is noticed and its consequences concerning the nature of potential instabilities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529373
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  • 6
    Electronic Resource
    Electronic Resource
    Fast large aperture camera and data acquisition system with applications in astrophysics, particle physics and nuclear medicine
    Amsterdam : Elsevier
    Nuclear Instruments and Methods In Physics Research 211 (1983), S. 179-191 
    Details
    ISSN: 0167-5087
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-5087(83)90568-9
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  • 7
    Electronic Resource
    Electronic Resource
    A Camera for Very High Energy Gamma-Ray Astronomy (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 422 (1984), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1984.tb23378.x
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  • 8
    Electronic Resource
    Electronic Resource
    Čech cocycles for characteristic classes (1996)
    Springer
    Communications in mathematical physics 178 (1996), S. 225-236 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We give general formulae for explicit Čech cocycles representing characteristic classes of real and complex vector bundles, as well as for cocycles representing Chern-Simons classes of bundles with arbitrary connections. Our formulae involve integrating differential forms over moving simplices inside homogeneous spaces. An important feature of our cocycles is that they take integer values (as opposed to real or rational values). We find in particular a formula for the instanton number of a connection over a closed four-manifold with arbitrary structure group. For flat connections, our formulae recover and generalize those of Cheeger and Simons. The methods of this paper apply also to the purely geometric construction of the Quillen line bundle with its metric.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104916
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  • 9
    Electronic Resource
    Electronic Resource
    Strongly nonlinear modal equations for nearly integrable PDEs (1993)
    Springer
    Journal of nonlinear science 3 (1993), S. 393-426 
    Details
    ISSN: 1432-1467
    Keywords: nearly integrable PDE ; nonlinear modes ; modulation equations ; numerical simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary The purpose of this paper is the derivation of reduced, finite-dimensional dynamical systems that govern the near-integrable modulations ofN-phase, spatially periodic, integrable wavetrains. The small parameter in this perturbation theory is the size of the nonintegrable perturbation in the equation, rather than the amplitude of the solution, which is arbitrary. Therefore, these reduced equations locally approximate strongly nonlinear behavior of the nearly integrable PDE. The derivation we present relies heavily on the integrability of the underlying PDE and applies, in general, to anyN-phase periodic wavetrain. For specific applications, however, a numerical pretest is applied to fix the truncation orderN. We present one example of the reduction philosophy with the damped, driven sine-Gordon system and summarize our present progress toward application of the modulation equations to this numerical study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429871
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  • 10
    Electronic Resource
    Electronic Resource
    Attractors and transients for a perturbed periodic KdV equation: A nonlinear spectral analysis (1993)
    Springer
    Journal of nonlinear science 3 (1993), S. 477-539 
    Details
    ISSN: 1432-1467
    Keywords: nearly integrable systems ; spectral transform ; attractors ; traveling waves ; stability ; numerical methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary In this paper we rigorously show the existence and smoothness inε of traveling wave solutions to a periodic Korteweg-deVries equation with a Kuramoto-Sivashinsky-type perturbation for sufficiently small values of the perturbation parameterε. The shape and the spectral transforms of these traveling waves are calculated perturbatively to first order. A linear stability theory using squared eigenfunction bases related to the spectral theory of the KdV equation is proposed and carried out numerically. Finally, the inverse spectral transform is used to study the transient and asymptotic stages of the dynamics of the solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429875
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