| Stable Summability and Approximation Theory |
25 JUL 89 |
11 pages |
| Authors:
Louise A. Raphael; HOWARD UNIV WASHINGTON D C
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 | This report summarizes the research activity in the following research areas: eigenfunctions expansions associated with elliptic operators; best data approximation; and multivariate splines. Results were published in 21 papers in research journals and conference proceedings. Fourteen of the papers are on elliptic and abstract operators, two on best data approximation, and five on splines. Keywords: Approximation theory; Stable summability; Elliptic operators; Abstract operators. (KR) |
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| Analysis of Blending Algorithms in Computer Graphics |
17 OCT 88 |
110 pages |
| Authors:
Ronald J. Leach; HOWARD UNIV WASHINGTON D C
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| The research on this project centered around the analysis, development, and implementation of fast algorithms for representing a surface which blends together two or more intersecting surfaces. The blending surface should provide a smoother transition than is available when simply considering the intersection of the surfaces. The algorithms developed must be efficient because the major portion of computing time in a solid modeling system should be devoted to the important ... |
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| Kinetic Processes in Discharge Pumped Mercury Halide Lasers |
15 AUG 88 |
3 pages |
| Authors:
Vikram S. Kushawaha; HOWARD UNIV WASHINGTON D C
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| This report describes the formation of excited state species observe d during collisions involving HgX2/CH3HgX(X=C,BR,I) molecules and electrons or ions at different laboratory kinetic energies. Electron impact dissociation of HgX2 and CH3HgX has been studied and formation of HgX (2sigma)-radicals and highly excited state of Hg atoms has been observed in the laboratory kinetic energy range of 1-100eV. With electron and CH3HgX collisions, emissions from CH- radicals and atomic hydrogen ... |
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| Howard University Symposium on Nonlinear Semigroups, Partial Differential Equations and Attractors (2nd) Held in Washington, D. C. on 3-7 August 1987 |
30 SEP 87 |
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| Authors:
Tepper Gill; Woodford W. Zachary; HOWARD UNIV WASHINGTON D C
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 | This conference will focus on nonlinear partial and integrodifferential equations by considering them as infinite-dimensional dynamical systems. One day will be devoted to new classes of equations that arise via mathematical modelling of large flexible space structures. Some of the topics which will be represented are: Nonlinear Semigroups; Dynamical Systems; Attractors; Reduction to Finite Dimensional Systems; Inertial Manifolds; Bifurcation Theory; Control Theory; Compensated Compactness; Nonlinear Evolution Equations; Reaction-Diffusion Equationsl and ... |
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| Photolysis of BrCN between 193 and 266 nm |
30 JAN 86 |
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| Authors:
Jeffrey A. Russell; Ian A. McLaren; William M. Jackson; Joshua B. Halpern; HOWARD UNIV WASHINGTON D C
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| Measurement of the quantum state distributions of CN (X2 Sigma + State) fragments from the photolysis of BrCN at several wavelengths between 193 and 266 nm shows that there is very little excitation of v > 1 levels in the nascent distributions for photolysis below 230 nm. Above this wavelength, significant population is found in excited vibrational states. Scaling of the distribtuions indicates that the potential energy surface on which ... |
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| Numerical and Experimental Simulation of Circulation Control Rotor Pneumodynamics |
JUL 1984 |
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| Authors:
C. B. Watkins; S. K. Dutta; K. R. Reader; HOWARD UNIV WASHINGTON D C
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| Numerical solution of the quasi-one-dimensional unsteady compressible flow equations applied to flow through the control valve and slotted air supply duct of a circulation control rotor is described. An implicit finite-difference method is used for the numerical solution. Solutions are compared with basic experimental results obtained for a mock-up of a circulation control rotor and its pneumatic valving system. Details of the experiment are presented and the experimental and numerical ... |
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| CHARACTERIZATION OF LOW INTENSITY X-RAY IMAGING DEVICES (LIXISCOPE) |
DEC 81 |
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| Authors:
George A. Ferguson; HOWARD UNIV WASHINGTON D C
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| the search for a high resolution imaging device to detect electromagnetic radiation in the 20 kev to 300 kev energy range led researchers at the national aeronautics and space administration (nasa) to the development of the lixiscope (acronym for low intensity x-ray imaging scope). a detailed description of the component parts and the principle of operation of this unique instrument are given elsewhere. the device is essentially the combination of ... |
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| Effect of Load Introduction on Graphite Epoxy Compression Specimens. |
JAN 81 |
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| Authors:
R. Reiss; T. M. Yao; HOWARD UNIV WASHINGTON D C
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| Compression testing of modern composite materials is affected by the manner in which the compressive load is introduced. Two such effects are investigated in this report: the constrained edge effect which prevents transverse expansion and is common to all compression testing in which the specimen is gripped in the fixture; and non-uniform gripping which induces bending into the specimen. This study has developed an analytical model capable of quantifying these ... |
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| Aspects of Predisposition to Assertiveness, Resistance to Assertiveness and Insight into Assertiveness Based Upon Race and Sex. |
15 DEC 1977 |
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| Authors:
James A. Bayton; HOWARD UNIV WASHINGTON D C
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| This research sought to investigate the potential for inter-group tension in terms of (1) predisposition to assertiveness, (2) resistance to assertiveness, and (3) insight into the assertiveness of others. These relationships were studied in terms of man-man, woman-woman scenarios (with White men and women as subjects); Black man-White man scenarios (Black and White men as subjects); and Black women-White women scenarios (Black and White women as Subjects). Relationships with these ... |
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| Gene Expression in Abnormal Cell Types of 'Neurospora crassa'. |
31 MAY 1975 |
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| Authors:
S. K. Dutta; HOWARD UNIV WASHINGTON D C
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| Significant results obtained during the first two years were as follows: (1) Abnormal morphology of the 'slime' morphological mutant of N. crassa was correlated with possible changes in DNA composition. (2) The transcribed DNA sequences if can be isolated, proved to be useful indicator for identification of transcriptional differences among mutant strains of N. crassa. (3) A marked differences in transcriptional differences in development of N. crassa was noticed and ... |
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| Radiation Damage in Optically Transparent Materials (Zircon) |
FEB 73 |
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| Authors:
A. N. Thorpe; F. E. Senftle; T. Tsang; C. Briggs; HOWARD UNIV WASHINGTON D C
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