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  • 1
    Electronic Resource
    Electronic Resource
    Chaotic domains: A numerical investigation (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 4 (1994), S. 607-619 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the chaotic domain state in rotating convection using a model equation that allows for a continuous range of roll orientations as in the experimental system. Methods are developed for extracting the domain configuration from the resulting patterns that should be applicable to a wide range of domain states. Comparison with the truncated three mode amplitude equation description is made. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166038
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of coupled maps with a conservation law (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 7 (1997), S. 311-330 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A particularly simple model belonging to a wide class of coupled maps which obey a local conservation law is studied. The phase structure of the system and the types of the phase transitions are determined. It is argued that the structure of the phase diagram is robust with respect to mild violations of the conservation law. Critical exponents possibly determining a new universality class are calculated for a set of independent order parameters. Numerical evidence is produced suggesting that the singularity in the density of Lyapunov exponents at λ=0 is a reflection of the singularity in the density of Fourier modes (a "Van Hove" singularity) and disappears if the conservation law is broken. Applicability of the Lyapunov dimension to the description of spatiotemporal chaos in a system with a conservation law is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166222
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  • 3
    Electronic Resource
    Electronic Resource
    Coupled map models for chaos in extended systems (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 2 (1992), S. 173-181 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coupled maps with conserved quantities are introduced as models for chaos in extended systems. The long-wavelength limit of a simple one-dimensional example is investigated in detail. A Langevin equation for this system is derived, and the applicability of the fluctuation-dissipation theorem is discussed. Several numerical experiments to investigate possible thermodynamic properties are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.165905
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear dynamics Chaos in space and time (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 404 (2000), S. 710-711 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many aspects of nature are essentially unpredictable over the long term, even when quantum effects are completely absent. A frequent cause is chaotic dynamics, which can arise when the rates of change of important dynamical variables depend in a nonlinear fashion on the variables themselves. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35008168
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  • 5
    Electronic Resource
    Electronic Resource
    Scientific Workers and War (1936)
    [s.l.] : Nature Publishing Group
    Nature 137 (1936), S. 829-830 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING recent months, several items have appeared in NATURE which were concerned at least in part with the topics of warfare, past or future. This may be taken as an expression of the realisation that science has given modern warfare its catastrophic character. While scientific investigators ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/137829b0
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the orientational electric field effect in 3He-B (1979)
    Springer
    Journal of low temperature physics 34 (1979), S. 607-616 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We have studied the orienting effect that an electric field has on the orbital motion of the pairs in superfluid 3He-B, using the orientation-dependent transverse NMR frequency shift as a probe. This method provides high resolution for studying the orienting effect for either sign of the orientational energy. Electric fields as high as 35,000 V/cm applied across the sample produced no measurable frequency shift at 0-, 10-, and 32-bar pressures. This gives upper limits to the orientational energy of 1.4 × 10\s-3, 1.0 × 10\s-3 and 4 × 10\s-4 times the values expected from simple theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114945
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  • 7
    Electronic Resource
    Electronic Resource
    Boundary conditions for normal-superfluid counterflow and internal Kapitza resistance in superfluids (1990)
    Springer
    Journal of low temperature physics 80 (1990), S. 237-268 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the spatial variation of the temperature and the normal fluid velocity of superfluid Fermi and Bose liquids between parallel plates in the presence of a stationary heat flow normal to the plates. The system is modeled by a quasiparticle kinetic equation and a diffuse scattering boundary condition at the walls. We derive integral equations for the hydrodynamic fields, which are solved numerically for arbitrary ratio of the mean free path to the plate separationL. For small ℓ/L we recover the hydrodynamic boundary conditions proposed recently by Grabinski and Liu and are able to determine the three surface Onsager coefficients. In the Kundsen regime (large ℓ/L), we find the thermal boundary resistance to increase exponentially with decreasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683633
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal boundary conductance between the U2D2 solid and B superfluid phases of3He (1993)
    Springer
    Journal of low temperature physics 90 (1993), S. 475-490 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first measurement of the thermal boundary conductance, 1/R B , between the U2D2 spin ordered solid and theB superfluid phases of3He. We find that 1/R B is exceedingly high, roughly seven orders of magnitude greater than that between sintered silver powder and liquid3He. ForT〈0.56 mK, 1/R B appeared to be thermally activated, i.e. 1/R B ∼exp(−ε/k B T), with ε=4.5(±0.5) mK, close to the superfluid gap energy. We also present a theory involving magnon-quasiparticle coupling as a model to explain the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681893
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  • 9
    Electronic Resource
    Electronic Resource
    Diagonalization of an exchange Hamiltonian for 163He spins (1984)
    Springer
    Journal of low temperature physics 57 (1984), S. 573-587 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An exact investigation of a finite-size quantum spin-1/2 model of bcc3He, consisting of two interpenetrating cubes with periodic boundary conditions, is performed with an exchange Hamiltonian incorporating two-, three-, and planar four-spin exchange. Although there is qualitative agreement with the mean field phase diagram, quantum effects are much larger (up to 100% in ground state energy) than with pure Heisenberg exchange. We comment on the comparison of theory and experiment in light of the present results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683682
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  • 10
    Electronic Resource
    Electronic Resource
    A generalized Ginzburg-Landau approach to the superfluidity of helium 3 (1975)
    Springer
    Journal of low temperature physics 21 (1975), S. 525-534 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coefficients in the expansion of the free energy and supercurrents in gradients of the order parameter are calculated from the microscopic Hamiltonian for all temperatures, first for a gas model and then including Fermi liquid corrections. This provides the basis for a simple discussion of the supercurrents and collective modes. The magnitude of the intrinsic orbital angular momentum in the Anderson-Brinkman-Morel phase is calculated, and found to beT c/EF smaller than previous estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141607
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