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  • 2005-2009  (59)
  • 1990-1994  (62)
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  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction analysis of Si1−xGex/Si superlattices (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3474-3479 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Si1−xGex/Si strained-layer superlattices grown by molecular-beam epitaxy on Si substrates were investigated by x-ray double-crystal diffraction and x-ray grazing incidence diffraction. Both coherent and incoherent interfaces between the two components of the superlattices were observed. By fitting computer-simulated double-crystal x-ray-diffraction rocking curves to the experimental data, it is determined that there exist graded variations in both the component thickness ratio t1/t2 (t1 and t2 are the thickness of the Si1−xGex and the Si layers, respectively) and the fraction x in one sample. The x-ray grazing incidence diffraction experiments reveal a lattice strain relaxation of about 27% in another sample. The lattice relaxation and the influence of variations of x and t1/t2 on the rocking curves are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351423
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  • 2
    Electronic Resource
    Electronic Resource
    Fast wave poloidal flow generation in a plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3890-3895 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fast wave poloidal flow generation at the plasma edge of a tokamak is studied with a one-dimensional slab model. In the absence of mode conversion, the poloidal flow can be generated by a spatial change of plasma velocity and current density profiles due to strong minority ion power absorption at the minority ion cyclotron resonance. The electromagnetic force plays a more important role in the flow generation than does the plasma Reynolds stress. In the presence of mode conversion, the flow is mainly generated by interference between the long-wavelength transmitted fast wave and the short-wavelength ion Bernstein wave (IBW) from mode conversion. Flow shear generated in the presence of mode conversion varies spatially with a scale length similar to the IBW wavelength. With mode conversion, the plasma Reynolds stress becomes more important in the flow shear generation than the electromagnetic force. For both cases, the plasma Reynolds stress and the electromagnetic force are out of phase, so that the resultant flow shear is smaller than the larger of the two. The short scale length flow shear enhances the turbulence stabilization. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870860
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  • 3
    Electronic Resource
    Electronic Resource
    Exact Solutions of the Steady-State Navier-Stokes Equations (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 23 (1991), S. 159-177 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.23.010191.001111
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  • 4
    Electronic Resource
    Electronic Resource
    A PC-based instrument of a modified differential normal pulse voltammetry with background current correction technique (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1679-1685 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Instead of the fixed pulse durations in conventional differential normal pulse voltammetry, a PC-based instrument using adaptable pulse duration vectors for background current correction has been proposed and implemented. With this PC-based instrument, a sequence of pulse duration vectors is determined in an initial blank solution voltammetry by assigning a decay percentage constant to the charging current. These vectors are then used in the subsequent test solution in order to obtain a pure oxidation current response in a resulting voltammogram with its corresponding features. Experimental results are presented to show the effectiveness and advantages of the PC-based instrument for the measurements of dopamine in a phosphate buffered solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144859
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  • 5
    Electronic Resource
    Electronic Resource
    The boundary layers due to shear flow over a still fluid (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1304-1306 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A constant shear flow passes on top of a heavier, still fluid. Similarity solutions are found for the boundary layers on both sides of the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858248
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  • 6
    Electronic Resource
    Electronic Resource
    A new scheme for x-ray grazing incidence diffraction (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2419-2423 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new scheme for x-ray grazing incidence diffraction (GID) under total external reflection conditions is presented. This simple scheme allows the grazing angles and the scattering angles to be adjusted independently so that the structural and/or the chemical profiles of materials can be determined at controlled depths. As an example, Si1−xGex/Si superlattice materials were studied. Both commensurate and incommensurate growths between the two quantum wells in the strained-layer superlattice were observed by the GID technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142257
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  • 7
    Electronic Resource
    Electronic Resource
    The Stokes drag due to the sliding of a smooth plate over a finned plate (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 2248-2252 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relative sliding motion of a smooth plate over a periodically finned plate is studied under the Stokes limit. The resulting harmonic or biharmonic equations with mixed boundary conditions are solved by eigenfunction expansions and collocation. The drag is determined as a function of fin height and fin spacing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868177
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  • 8
    Electronic Resource
    Electronic Resource
    Stokes flow through a two-dimensional filter (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1113-1116 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple eigenfunction expansion and matching method is used to solve the slow viscous flow through a wall with two-dimensional periodic gaps. The normalized pressure drop is determined as a function of the geometric parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858596
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  • 9
    Electronic Resource
    Electronic Resource
    Mixed convection on a vertical needle with heated tip (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 622-625 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The mixed convection on a vertical slender adiabatic paraboloid with a tip heat source is studied. The boundary layer equations admit similarity solutions that are governed by a nondimensional free-stream parameter γ and a heat source parameter α. Numerical results show for aiding flow (α〉0) the solutions are unique and for opposing flow (α〈0) the solutions may be unique, dual, or nonexistent. Velocity and temperature profiles are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857709
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  • 10
    Electronic Resource
    Electronic Resource
    Elastodynamic fundamental solutions for anisotropic solids (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 118 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: 3-D and 2-D time-domain elastodynamic fundamental solutions (or Green's functions) for linearly elastic anisotropic materials are obtained by the Radon transform. Fundamental solutions in the frequency domain follow directly by a subsequent evaluation of the Fourier transforms of the time-domain solutions. The solutions are in the form of a surface integral over a unit sphere for 3-D cases and in the form of a contour integral over a unit circle for 2-D cases. The integrals have a simple structure that can be interpreted as a superposition of plane waves. The wavefields can be separated into singular and regular parts. The singular parts correspond to the elastostatic fundamental solutions. The regular parts are bounded continuous functions. The integrals have been evaluated numerically for several examples. The results presented in this paper have direct applications to the formulation of boundary-integral equations for bodies of anisotropic materials and for the subsequent solution of these equations by the boundary-element method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03970.x
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