Government-wide Index to Federal Research & Development Reports PDF Download
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Author:
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Category : Government publications
Languages : en
Pages : 1576
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1576
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Author: Johannes N. Plendl
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ISBN:
Category : Chemical bonds
Languages : en
Pages : 98
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This work treats spectral and atomistic concepts derived from an analytical study of more than one hundred solids. The study deals with such characteristics as infrared spectra, specific heat, bulk-modulus, change of compressibility with pressure, lattice anharmonicity, exponent of repulsion, lattice cohesive energy, zero-point energy, hardness, and valence. Characterizing the lattice vibrations - that is, the infrared spectrum through one single frequency (the 'centro-frequency', defined by the center of gravity of the entire spectrum) - it is shown that an identical frequency may be derived as a mechanical analogy from the average velocity of sound determined, in this case, from the cubic compressibility. A thermodynamical analogy exists in the Debye frequency from specific heat. The 'centro-frequency' has proven to be the key to a successful formulation of the nonlinearity or anharmonicity of the attractive and repulsive forces in solids. The importance of anharmonicity for the understanding of the basic properties of solids from an atomistic point of view is shown through various applications. (Author).
Author:
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Category : Science
Languages : en
Pages : 776
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Author: Air Force Cambridge Research Laboratories (U.S.)
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Category : Geophysics
Languages : en
Pages : 350
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Author: Roger Even Bove
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Category : Algorithms
Languages : en
Pages : 118
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The following paper represents work to date on the deformation method for quadratic programming and thus may be regarded as a sequel to Zahl, S. (1964) A Deformation Method for Quadratic Programming, Research Note AFCRL-63-132. It gives an explanation of a modified Iverson programming language and uses this to give a detailed algorithm for the Zahl Deformation Method of Quadratic Programming.
Author: Richard Payne
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ISBN:
Category : Anions
Languages : en
Pages : 28
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A theory of hydromagnetic ionizing waves has been developed which is valid in the region in which gas pressure is negligible, compared with magnetic pressure. The theory takes into account the energy expended in partial ionization of the gas behind the wave. The usual high conductivity boundary condition behind the wave is not employed. The electric field in front of the wave is taken as a parameter. Results of this theory are compared with available experimental measurements, and show good agreement. (Author).
Author: Leonard Eyges
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ISBN:
Category : Integral equations
Languages : en
Pages : 18
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The quantum-mechanical ground-state problem for three identical particles bound by attractive inter-particle potentials is discussed. For this problem it has previously been shown that it is advantageous to write the wave function in a special functional form, form which an integral equation which is equivalent to the Schrodinger equation was derived. In this paper a new method for solving this equation is presented. The method involves an expansion of a two-body problem with a potential of the same shape as the inter-particle potential in the three-body problem, but of enhanced strength.
Author: E. Czerlinsky
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ISBN:
Category : Anisotropy
Languages : en
Pages : 14
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Author: Ronald G. Newburgh
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Category : Absorption
Languages : en
Pages : 34
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The Wheeler-Feynman absorber theory of radiation is reviewed. A proof is offered to show that a sum of advanced and retarded effects from the absorber can provide the origin of radiative reaction. This proof is different from and perhaps simpler than that of Wheeler and Feynman. From arguments of momentum and energy conservation the necessity of the absorber for the emission of radiation is demonstrated for three cases. (Author).
Author: E. J. Post
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ISBN:
Category : Cavity resonators
Languages : en
Pages : 10
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