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  • 1
    Electronic Resource
    Electronic Resource
    Rational function approximation for atomic and molecular wave functionsSupported in part by a National Science Foundation Grant. (1969)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 1067-1068 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560030627
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Unified derivation of the perturbation series for the real and imaginary parts of the energy of hydrogen in the stark effect and of the negatively anharmonic oscillator (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 21 (1982), S. 125-131 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The wave function for hydrogen in the Stark effect (or for the negatively anharmonic oscillator) with an outgoing-wave boundary condition, constructed in Langer-Cherry fJWKB form, is continued back to the origin. The asymptotic expansions for ReE and ImE are determined by the requirement that the wave function be regular at the origin to zeroth and first order in the exponentially small parameter that characterizes ImE. One fJWKB function turns out to be the Rayleigh-Schrödinger perturbation theory wave function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560210109
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  • 3
    Electronic Resource
    Electronic Resource
    Reality and complexity in asymptotic expansions for eigenvalues and eigenfunctions, with application to the JWKB connection-formula problem (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 29 (1986), S. 261-272 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Asymptotic expansions occur widely in quantum physics. The Rayleigh-Schrödinger perturbation theory for hydrogen in an electrostatic field (the LoSurdo - Stark effect) is one example. The 1/R expansion for the hydrogen molecule ion H+2 is a second. The quantum defect theory and the JWKB method are two more. It is not so widely known that the sum of such real asymptotic expansions may be complex, while the sum of complex asymptotic expansions may be real. The key to this nonintuitive behavior is Borel summation. By examining a simple example related to the exponential integral, the nature of this real-iscomplex, complex-is-real phenomenon is made simple. Then special application is made to derive and clarify the connection formulas (to all orders) in the JWKB method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560290216
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    MINDO/3 Calculation of carbocation heats of formation (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 3 (1982), S. 208-213 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Heats of formation calculated by MINDO/3 are reported for 42 carbocations for which experimental heats of formation have been published. Errors associated with these calculations can be large, with an overall range of ±13 kcal/mol. Correction of systematic errors in the MINDO/3 calculations by means of hydrocarbon models and isodesmic relationships results in a reduction in the range of errors to ±8 kcal/mol. Comparison with experimental heats of reaction of hydride transfer equilibria minimizes experimental errors and gives an average absolute error of 2 kcal/mol with a range of ±3 kcal/mol.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540030211
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  • 5
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    Calculation methods for compressible turbulent boundary layers (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Calculation procedures for non-reacting compressible two- and three-dimensional turbulent boundary layers were reviewed. Integral, transformation and correlation methods, as well as finite difference solutions of the complete boundary layer equations summarized. Alternative numerical solution procedures were examined, and both mean field and mean turbulence field closure models were considered. Physics and related calculation problems peculiar to compressible turbulent boundary layers are described. A catalog of available solution procedures of the finite difference, finite element, and method of weighted residuals genre is included. Influence of compressibility, low Reynolds number, wall blowing, and pressure gradient upon mean field closure constants are reported.
    Keywords: AERODYNAMICS
    Type: Von Karman Inst. for Fluid Dyn. Compressible Turbulent Boundary Layers, Vol. 2; 124 p
    Format: text
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  • 6
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    Calculation of three-dimensional compressible laminar and turbulent boundary layers. An implicit finite-difference procedure for solving the three-dimensional compressible laminar, transitional, and turbulent boundary-layer equations (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An implicit finite-difference procedure is presented for solving the compressible three-dimensional boundary-layer equations. The method is second-order accurate, unconditionally stable (conditional stability for reverse cross flow), and efficient from the viewpoint of computer storage and processing time. The Reynolds stress terms are modeled by (1) a single-layer mixing length model and (2) a two-layer eddy viscosity model. These models, although simple in concept, accurately predicted the equilibrium turbulent flow for the conditions considered. Numerical results are compared with experimental wall and profile data for a cone at an angle of attack larger than the cone semiapex angle. These comparisons clearly indicate that the numerical procedure and turbulence models accurately predict the experimental data with as few as 21 nodal points in the plane normal to the wall boundary.
    Keywords: AERODYNAMICS
    Type: Aerodynamic Analyses Requiring Advanced Computers, Pt. 1; p 17-40
    Format: application/pdf
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  • 7
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    Aerodynamic characteristics of a series of spherically blunted 10 deg cones with 30 deg and 60 deg base flares (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Aerodynamic characteristics of slightly blunted conical bodies with 30 and 60 degree base flares
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-3675
    Format: application/pdf
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  • 8
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    Force-coefficient and moment-coefficient correlations and air-helium simulation for spherically blunted cones (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Force coefficient and moment coefficient correlations and air-helium simulation of spherically blunted cones - hypersonic wind tunnel testing
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-2184
    Format: application/pdf
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  • 9
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    Solution of the surface Euler equations for accurate three-dimensional boundary-layer analysis of aerodynamic configurations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The three-dimensional boundary-layer equations in the limit as the normal coordinate tends to infinity are called the surface Euler equations. The present paper describes an accurate method for generating edge conditions for three-dimensional boundary-layer codes using these equations. The inviscid pressure distribution is first interpolated to the boundary-layer grid. The surface Euler equations are then solved with this pressure field and a prescribed set of initial and boundary conditions to yield the velocities along the two surface coordinate directions. Results for typical wing and fuselage geometries are presented. The smoothness and accuracy of the edge conditions obtained are found to be superior to the conventional interpolation procedures.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-1154
    Format: text
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  • 10
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    Phase 2 and 3 wind tunnel tests of the J-97 powered, external augmentor V/STOL model (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Static and forward speed tests were made in a 40 multiplied by 80 foot wind tunnel of a large-scale, ejector-powered V/STOL aircraft model. Modifications were made to the model following earlier tests primarily to improve longitudinal acceleration capability during transition from hovering to wingborne flight. A rearward deflection of the fuselage augmentor thrust vector was shown to be beneficial in this regard. Other augmentor modifications were tested, notably the removal of both endplates, which improved acceleration performance at the higher transition speeds. The model tests again demonstrated minimal interference of the fuselage augmentor on aerodynamic lift. A flapped canard surface also showed negligible influence on the performance of the wing and of the fuselage augmentor.
    Keywords: AERODYNAMICS
    Type: NASA-CR-163578 , DHC-DND-80-1
    Format: application/pdf
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