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  • American Physical Society  (62)
  • American Institute of Physics (AIP)  (16)
  • Oxford University Press  (5)
  • EDP Sciences
  • Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
  • 1985-1989  (83)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    In situ measurement of the fractal dimensionality of ultrafine aerosol particles (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 954-956 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fractal dimension df of gas phase agglomerated particles is measured in situ for the first time. This is done by comparing aerodynamic radii R0 and Rc1 before and after tempering. By tempering, agglomerates are collapsed into close-packed clusters of df=3. It is shown that the equation M∼Rdf0 , where M is the agglomerate mass, holds almost down to R0=Rc1 =Rm (monomer radius), making df a very useful quantity for aerosol characterization. The measurement yields df(approximately-equal-to)2.18 for Ag agglomerates with Rm(approximately-equal-to)7.5 nm. df is predicted to be material dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99239
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  • 2
    Electronic Resource
    Electronic Resource
    Study of weak magnetism effects in heavy-electron systems by μ+SR (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5639-5639 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We will present results from μ+SR investigations of the heavy-electron systems CeAl3, U2Zn17, UCu5, and UCd11. The latter three are known to order antiferromagnetically at low temperatures. The transition into the antiferromagnetic phase is clearly manifest in the μ+SR data, but also above the Néel temperatures some weak magnetism seems to persist as can be inferred from enhanced μ+ relaxation rates even in zero applied field. The involved effective moments are much reduced in comparison to the free-ion f moments, generally below 0.5 μB, and the magnetic order may be of the spin-glass or spin-density wave type. In nonmagnetic CeAl3 a spontaneous μ+ precession signal appears below 0.7 K in zero external field which implies the presence of even some coherent magnetic order of probably very short range in this system. These findings are consistent with other recent μ+SR and neutron scattering work, indicating that weak magnetic mechanisms seem to be a characteristic feature of heavy-electron systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342281
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of high-temperature spin fluctuations in UBe13 by nuclear-spin relaxation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3890-3892 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the extension of measurements of the 9Be spin-lattice relaxation rate in UBe13 from 300 up to 1000 K. They reflect the fluctuating local magnetic field at the site of the 9Be nuclei. Above about 100 K, there appears a new contribution in addition to the rate observed at lower temperatures. The high temperature contribution is modeled in terms of the thermal excitation of low-lying states of the U3+ ion along lines used by Felton et al. to explain their measurements of the specific heat. Our results indicate a splitting of 200±20 K between the ground and excited states of the system, and a lifetime of 8×10−14 s for the excited states (width =95 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340594
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  • 4
    Electronic Resource
    Electronic Resource
    High-temperature and -pressure system for laser Raman spectroscopy of aqueous solutions (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2247-2253 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-temperature, high-pressure experimental system is presented that is compatible with a state-of-the-art laser Raman spectrometer. The apparatus and associate electronics and valving, which allow Raman spectra acquisition from ambient conditions to 500 °C and 1-kbar pressure in corrosive aqueous solutions, are described. Diamond windows and a titanium bodied optical design are used to obtain these conditions. Automatically controlled heating jackets have been built that allow ±0.4 °C temperature stability over this range. Raman spectra are presented that demonstrate the capabilities of this experimental apparatus for aqueous studies as a function of temperature and pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139942
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  • 5
    Electronic Resource
    Electronic Resource
    Scattering by a parabolic cylinder—A uniform asymptotic expansion (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 854-860 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A uniform asymptotic expansion in the variable, determining the location of the observer for the fields scattered by a perfectly conducting parabolic cylinder, is derived. This expansion can be applied to scattering by arbitrary smooth convex surfaces of variable curvature. The accuracy of numerical results is examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526578
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  • 6
    Electronic Resource
    Electronic Resource
    Chaotic flows and fast magnetic dynamos (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2992-3011 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Given a prescribed flow of an initially unmagnetized conducting fluid, one can ask if a small seed magnetic field will amplify exponentially with time. This is called the kinematic dynamo problem. In many cases of interest (particularly in astrophysics), very high electrical conductivity of the fluid (high magnetic Reynolds number Rm ) is relevant. In this paper the kinematic dynamo problem is considered in the Rm →∞ limit (the "fast'' kinematic dynamo). It appears that an important ingredient for a kinematic dynamo in this limit is that the orbits of fluid elements in the flow be chaotic. In this paper it is shown that the magnetic field tends to concentrate on a zero volume fractal set, and, in addition, tends to exhibit arbitrarily fine-scaled oscillations between parallel and antiparallel directions. Idealized analyzable examples exhibiting these properties are presented, along with numerical computations on more typical examples. For the latter a numerical technique for treating fast dynamos is developed and its properties are discussed. The relation of the dynamo growth rate to quantitative measures of chaos, namely, the Lyapunov exponent and topological entropy, is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866956
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  • 7
    Electronic Resource
    Electronic Resource
    Linear stability of obliquely propagating electromagnetic waves in magnetically insulated gaps (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3851-3857 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A linear stability analysis for obliquely propagating electromagnetic waves in a magnetically insulated planar anode–cathode gap is presented. Previously published work [Phys. Fluids 24, 1821 (1981)] considered propagation perpendicular and parallel to the insulating magnetic field. Here the effect of propagation at oblique angles to the insulating field is considered. In general, growth rates decrease monotonically when the propagation angle becomes more parallel to B, and this effect is more pronounced for shorter-wavelength waves for which analytic asymptotic results are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865768
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  • 8
    Electronic Resource
    Electronic Resource
    Stability of magnetically insulated ion diodes (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1948-1955 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetically insulated ion diodes are examined for instability using analytical and numerical techniques. Two basic sources which drive instability are found: one due to a two-stream-type interaction between electrons and ions and the other due to ion transit time effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864939
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  • 9
    Electronic Resource
    Electronic Resource
    Self-focusing of short intense pulses in plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 526-532 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The self-focusing of relativistically intense laser light pulses is analyzed, where the pulse length is short enough that ion inertia prevents any significant motion of ions. Self-focusing occurs as a result of an increase of the wave refractive index arising from two effects: the mass increase of electrons caused by their relativistic quiver velocity in the light wave, and the reduction of the electron density as a result of ponderomotive force expulsion of the electrons. The latter effect is significant even for rather small values of (P−PL)/PL, where P is the laser beam power and PL is the critical power above which self-focusing occurs. In fact, for (P−PL)/PL(approximately-greater-than)0.1 the effect is so strong that all electrons are expelled within a core radial region of the self-focused laser light channel (this new phenomenon is called electron cavitation).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866349
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  • 10
    Electronic Resource
    Electronic Resource
    Parametric scaling of the stability of relativistic laminar flow magnetic insulation (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2878-2881 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The short wavelength limit of the magnetron instability of a relativistic sharp boundary electron sheath is examined. For short wavelengths the mode is localized to the sheath edge. This localization leads to a simple relationship (essentially a Lorentz transformation) between the relativistic and nonrelativistic growth rates. This relationship involves only equilibrium quantities evaluated at the sheath edge and explains previously noted trends that have been observed numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865208
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