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  • 1
    Electronic Resource
    Electronic Resource
    Thermal lens scanning of the glass transition in polymers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2220-2226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we discuss the use of the thermal lens technique for investigating the thermal properties of polymers as a function of temperature. It is also discussed how the experimentally determined thermal lens parameters can be used to locate the glass transition in polymers. The methodology is tested using a solution casted films of poly(vinyl chloride) as a testing sample. A comparison with conventional differential scanning calorimetry data is made. It is proposed that the current transient thermal lens methodology, with minor changes in its experimental configuration, could be adapted to develop a new methodology called differential thermal lens scanning especially designed for the investigation of the phase transitions in polymers. It is shown that this new methodology could be equally used for the measurement of the thermal expansion coefficient, above and below the glass transition. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1333737
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  • 2
    Electronic Resource
    Electronic Resource
    Exchange-dominated surface spin waves in ferromagnetic and antiferromagnetic films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5941-5943 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theoretical results are presented for the localized surface spin waves in thin magnetic films in the exchange-dominated regime. The method is based on a spin-wave operator and Green-function technique that utilizes special properties of tridiagonal and pentadiagonal matrices, and two applications are described here. One is to study the effects of finite film thickness in coupling the modes localized near the two surfaces of an antiferromagnet with a simple cubic structure for the magnetic ions, and numerical examples are given for ultrathin films. The second application is to consider the surface spin waves in ferromagnetic films with body-centered cubic structure and (111) surfaces. Its relevance to recent experimental data for localized modes in epitaxial W/Ni/W films is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372960
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of dipole-exchange spin waves in ultrathin antiferromagnetic films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4949-4951 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A spin wave theory is developed for ultrathin antiferromagnetic films in the regime where the effects of the dipole–dipole and exchange interactions may be comparable. A microscopic model with a Hamiltonian representation of the above terms is employed, giving a description of linear spin waves in lowest order and the dominant spin wave interactions as higher-order effects. Applications are made to rutile-structure antiferromagnets (such as MnF2), perovskite-structure antiferromagnets (such as RbMnF3), and layered antiferromagnets (such as K2NiF4), which exhibit quite different behavior. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370055
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  • 4
    Electronic Resource
    Electronic Resource
    On the quantization of Poincaré and de Sitter gauge models (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 1472-1476 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The gauge model based on the Yang–Mills equations for the Poincaré group cannot be consistently quantized, at least in a perturbative approach. The regulated theory, obtained by adding the counterterms required by consistency and renormalizability, is just the gauge theory for a de Sitter group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527942
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  • 5
    Electronic Resource
    Electronic Resource
    Geometrical anisotropy dependence of thermal diffusivity in lyotropic nematics: Mode mismatched thermal lens measurements (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3371-3373 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work the quantitative theoretical treatment for two beam mode mismatched thermal lens spectrometry is applied to investigate the thermal diffusivity anisotropy of two lyotropic mixtures: (1) potassium laurate, decanol and water and (2) potassium laurate, potassium chloride and water in the nematic calamitic phase. The ratio between the thermal diffusivities parallel and perpendicular to the director has been shown to be smaller than those reported for thermotropic liquid crystal. This observation is explained by using a simple model where this ratio is correlated to the micellar shape anisotropy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116507
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  • 6
    Electronic Resource
    Electronic Resource
    The Korteweg–de Vries hierarchy and long water-waves (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 307-320 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: By using the multiple scale method with the simultaneous introduction of multiple times, we study the propagation of long surface-waves in a shallow inviscid fluid. As a consequence of the requirements of scale invariance and absence of secular terms in each order of the perturbative expansion, we show that the Korteweg–de Vries hierarchy equations do play a role in the description of such waves. Finally, we show that this procedure of eliminating secularities is closely related to the renormalization technique introduced by Kodama and Taniuti. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531294
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  • 7
    Electronic Resource
    Electronic Resource
    Boussinesq solitary-wave as a multiple-time solution of the Korteweg–de Vries hierarchy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 6822-6828 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We study the Boussinesq equation from the point of view of a multiple-time reductive perturbation method. As a consequence of the elimination of the secular producing terms through the use of the Korteweg–de Vries hierarchy, we show that the solitary-wave of the Boussinesq equation is a solitary-wave satisfying simultaneously all equations of the Korteweg–de Vries hierarchy, each one in an appropriate slow time variable. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531190
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  • 8
    Electronic Resource
    Electronic Resource
    Piston-driven, unsteady separation at a sudden expansion in a tube: Flow visualization and LDA measurements (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1249-1260 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flow visualization studies and laser-Doppler anemometry (LDA) measurements have been performed on the flow field generated at a sudden expansion in a cylindrical pipe during the intake stroke of a piston. The range of piston Reynolds numbers investigated, based on piston diameter and velocity, was 18–125 and covered a laminar and a transition-to-turbulence regime. A detailed study of the parameters influencing the structure of the flow, i.e., the clearance volume and the piston velocity, was carried out and is presented, and the mechanism for the creation of flow instabilities at low Reynolds numbers is outlined. One of the striking features of the flow relates to the formation of vortex structures during the intake flow. It is found that under some circumstances these structures become unstable, despite the relatively low Reynolds number of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857348
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