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  • 1
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in polar and viscoelastic fluids with internal rotation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 9102-9113 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the formalism of extended irreversible thermodynamics we derive the generalized constitutive equations for the polarization vector and the symmetric and antisymmetric parts of the total stress tensors (the sum of the Maxwell and viscous stress tensors) of a viscoelastic polar fluid. The analysis of these equations shows several interesting features for a permanent dipolar system. The diffusive transport of polarization charge and the diffusion of the transverse polarization component are two elementary physical processes in terms of which complex cases of dielectric relaxation can be described, taking into account both translational and rotational motions of the dipolar particles in a viscoelastic fluid. The calculations for several cases of the complex dielectric susceptibility are presented. In these results, the coupling between polarization and hydrodynamics predicts several modes of dielectric energy dissipation. These various channels are due to the intimate coupling between different degrees of freedom, taken into account by the constitutive equations. The calculation of the complex shear and rotational viscosities complete the presentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462219
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  • 2
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in polar and viscoelastic fluids (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5147-5155 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The generalized evolution equations for the polarization vector and the total stress tensor (viscous plus Maxwell's electric stress tensors) are obtained in the framework of extended irreversible thermodynamics. The coupling of these equations represents the mutual influence between mechanical and dielectric properties of a viscoelastic and dielectric fluid. The dipolar memory and the associated correlation functions are discussed in order to give an understanding in the current way of thinking based on linear response theory. A comparison with studies of polarization charge diffusion is included as a particular result obtained from the generalized constitutive equations. Calculations of the complex electric susceptibility and the complex viscosity for the linear and incompressible case are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459685
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  • 3
    Electronic Resource
    Electronic Resource
    Three-dimensional instability of a liquid layer flowing down a heated vertical cylinder (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 2198-2209 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The three-dimensional thermocapillary instability of a fluid film coating the outside or the inside of a cylinder is investigated in the absence and in the presence of gravity. In the absence of gravity (pure thermocapillarity), it is found that it is possible to excite high azimuthal modes as the most unstable. In the presence of gravity the thermocapillary instability of a thin fluid film flowing down a vertical cylinder is investigated. It is shown that thermocapillarity also promotes the instability of high azimuthal modes, even higher than those found in the pure thermocapillary case. This is in contrast with the isothermal case where only the zeroth mode (the longitudinal one) is the most unstable and also with previous work on flow down a rotating cylinder where, in some conditions, rotation may promote the first azimuthal mode as the most unstable. Curves of criticality and those corresponding to the maximum growth rate are given for different values of the parameters. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286594
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  • 4
    Electronic Resource
    Electronic Resource
    A computer-based digital feedback control of frequency drift of multiple lasers (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3737-3740 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report a method to monitor and control laser frequencies with an optical cavity and a digital feedback system. A frequency-stabilized He–Ne laser provides the reference that is transferred to several other lasers using a scanning Fabry–Pérot cavity. A personal computer-based multifunction data acquisition system generates the scan wave form, and reads the detector outputs synchronously with the cavity scan. The computer determines the positions of all of the peaks in the scan, and generates output signals to control the laser frequencies. It also provides a visual display of cavity spectra. We have successfully used the setup to achieve a long-term lock of the lasers for magneto-optical trapping of radioactive francium atoms. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149171
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  • 5
    Electronic Resource
    Electronic Resource
    Reply to comments of Chakraborty and Tuteja (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3127-3127 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A reply to the comments by Chakraborty and Tuteja [Phys. Fluids A 1, 1600 (1989)] is presented. After a careful review, it was found that their comments are correct. Despite this, the physical conclusions, for H=0, concerning the implications of the problem on natural convection under a horizontal magnetic field remain the same.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858129
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrodynamic stability of a fluid layer flowing down a rotating inclined plane (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1651-1665 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear stability of a fluid layer flowing down a rotating inclined plane is investigated. The analysis leads to a system of two coupled ordinary differential equations that generalizes the well-known Orr–Sommerfeld equation. These coupled equations are solved by means of two approximations: the small wave-number approximation and the small Reynolds number approximation. For the small wave-number approximation, it is shown that the Coriolis force not only may decrease the growth rate of the instability, but it may stabilize the flow for all angles of propagation of the perturbation. For the small Reynolds and Taylor numbers and small angle of inclination, it is shown that an increase in Taylor number may destabilize the fluid layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858387
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  • 7
    Electronic Resource
    Electronic Resource
    Rayleigh–Taylor instability of a continuously stratified magnetofluid under a general rotation field (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1600-1602 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Rayleigh–Taylor instability of a continuously stratified magnetofluid under a general rotation field and a vertically stratified horizontal magnetic field is investigated. The upper bound for the growth rate of the perturbation is found and corrections to that obtained by Chakraborty [Phys. Fluids 25, 743 (1982)] are given. The theory predicts the formation of rolls appearing in natural rotating convection and magnetoconvection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857305
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  • 8
    Electronic Resource
    Electronic Resource
    Rayleigh–Taylor instability of a continuously stratified fluid under a general rotation field (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1192-1199 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An estimate of the upper bound of the growth rate of instability in a continuously unstable stratified fluid under a general rotation field is obtained. An example for exponential stratification is given. For magnitudes of the wavenumber k slightly above kc (where kc is the critical value for instability) it is shown that the angle of propagation for the perturbation associated to a maximum growth rate is θmax =0° (180°), where θmax is measured relative to a fixed horizontal component of rotation. For larger values of k bifurcation occurs with two maxima of the same magnitude appearing at angles different from θ=0° but symmetrically located. Increasing k leads to a unique maximum at θmax =90° (−90°). The bifurcation tends to disappear as the vertical component of rotation is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857342
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  • 9
    Electronic Resource
    Electronic Resource
    LASER TRAPPING OF RADIOACTIVE ATOMS (1997)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 47 (1997), S. 429-461 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract Light forces acting on radioactive atoms confine them in cold samples of large phase space density. We describe the processes of radioactive atom production, reduction of their velocity, and capture. The trapped atoms form excellent sources for the study of atomic parity non-conservation, beta decay and alpha decay asymmetries, and other weak interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.nucl.47.1.429
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrafast dielectric relaxation response of polar liquids (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2348-2354 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we calculate the complex dielectric constant of polar liquids for microwave and far-infrared range of frequencies. We use the formalism of extended irreversible thermodynamics (EIT) to obtain the autocorrelation function of the polarization vector. To this end, we introduce the local variation of the polarization flow as an independent variable, which allows for the description of collective interacting effects into the formalism. The results obtained here are compared with previous work in the so-called three-variable theory based on the Mori-Zwanzig projection operator technique. This comparison provides an interpretation of EIT in terms of a microscopic theory from which the role of the new independent variable can be established. Using the result of the complex dielectric constant presented here, we show that the fitting of experimental data in polar fluids can be improved in the far infrared frequencies. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473789
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