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  • 1
    Electronic Resource
    Electronic Resource
    Amplification of acoustic waves in piezoelectric semiconductors: Effect of nonlinearity in electron effective mass and collision frequency (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 267-271 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper essentially seeks to provide a theoretical construct to the experimental studies on the acoustoelectric amplification in piezoelectric semiconductors showing that the attenuation of an acoustic wave crosses over to its amplification when electron drift velocity exceeds the acoustic wave velocity. In this paper, first, a phenomenological theory is developed to study the relative change in electron mass and collision frequency when an acoustic wave propagates through piezoelectric semiconductors. Then, analytically, we have shown that this nonlinearity in electron mass and collision frequency arising due to the electric vector of the field associated with the wave can also explain this behavior. Numerical computations are made for a typical case of n-InSb at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337693
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Traveling-wave solutions and the coupled Korteweg–de Vries equation (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 2558-2560 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Some coupled nonlinear equations are considered for studying traveling-wave solutions. By introducing a stream function Ψ it is shown that if one of the solutions is of the form v≡v(x−ct), the other also must be of the form u≡u(x−ct). In addition, the possibility of including cubic nonlinear terms has been considered and such a system, assuming that the solutions are of the traveling-wave type, has been solved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527324
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On disturbances in an elastic medium in contact with a liquid medium and subjected to a magnetic field (1969)
    Springer
    Pure and applied geophysics 75 (1969), S. 98-101 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present note makes use of electromagnetic equations of Maxwell and those of mechanical motions to work out the problem of disturbances in two perfectly conductive media—an ideal liquid and a perfectly elastic solid-acted upon by a magnetic field perpendicular to their plane of contact. The displacement suffered by solid medium has been determined when a tangential force, exponentially decaying with time, acts in the plane of contact of the two media. The solution of the problem is achieved by using the method of Laplace transform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875047
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the random motion of a uniform beam in a magnetic field (1972)
    Springer
    Pure and applied geophysics 99 (1972), S. 94-98 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present note is concerned with the investigation of responses under random processes of a beam-plate placed in a magnetic field which is transverse in nature. The distinctive features of the motion have been pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875267
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A simplified solution for plastic collapse loads of square tubes subjected to opposed transverse line loads (1982)
    Springer
    Acta mechanica 44 (1982), S. 177-186 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A simplified theory of yield hinge surfaces usually applied in plastic collapse analysis of thin plates in transverse loading is modified and used to simulate deformation modes in square tubes during opposed transverse loading. The experimental results of maximum load observed in several cases are compared with the theoretical estimates based on rigid perfectly-plastic material model. Excellent corroboration between the experimental results and theoretical predictions were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303336
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of plastic collapse loads of rectangular tubes (1984)
    Springer
    Acta mechanica 51 (1984), S. 199-215 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A simplified theory of yield hinge surfaces usually applied in plastic collapse analysis of thin plates in transverse loading is modified and used to simulate modes of plastic collapse of rectangular tubes in opposed transverse loading. The experimental results of maximum load observed in several cases are compared with the theoretical estimates based on rigid-perfectly plastic material model. The agreement between the theoretical and experimental results was found to be generally satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177072
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamical Initialization of Boundary-Layer Data (1998)
    Springer
    Boundary layer meteorology 87 (1998), S. 509-514 
    Details
    ISSN: 1573-1472
    Keywords: Dynamical initialization ; Transilient fluxes ; Eddy transfer coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A procedure for the dynamic initialization of wind and temperature fields within the atmospheric boundary layer (ABL) is presented. The procedure uses transilient turbulence theory to assess the turbulent fluxes from observed wind and temperature data, which are used to estimate the eddy transfer coefficients, so enabling a local closure ABL model to be integrated forward in time to a new steady state. The method has been applied to initialize kytoon data taken at Kharagpur (22.3° N, 87.2° E) during the MONTBLEX field programme. Results of a case study for 17 June 1990 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000940617057
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    On pure bending of a curved bar of piezoelectric material (1966)
    Springer
    Flow, turbulence and combustion 15 (1966), S. 76-80 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The present note makes use of the electromagnetic equations of Maxwell, equations of elasticity coupled with the constitutive relations of a piezoelectric quartz to solve the piezoelectric analogue of the elastic problem of pure bending of a curved bar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411547
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Radial deformation of an annular piezoelectric disk with a concentric inhomogeneous annular rigid inclusion (1967)
    Springer
    Czechoslovak journal of physics 17 (1967), S. 981-986 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equations of elasticity, the equations of electricity supplemented by the constitutive equations of a piezoelectric quartz have been employed to investigate the deformation of an annular piezoelectric disk containing a concentric inhomogeneous rigid inclusion. The effects on the deformations have also been discussed in the paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01698021
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Accelerating Kortweg-de Vries solitons (1989)
    Springer
    International journal of theoretical physics 28 (1989), S. 481-486 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A one-parameter transformation group which leaves a form of nonlinear Kortweg-de Vries equation invariant has been determined through a classical approach. Solutions of this differential equation have been obtained. They show the existence of accelerating solitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00673298
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    Paper (German National Licenses)
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