| Primary Events in Vision. |
04 OCT 1979 |
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| Authors:
Aaron Lewis; CORNELL UNIV ITHACA N Y
|
 | Experiments on iodopsin and bacteriorhodopsin (which have thermal transitions from batho-iodopsin and batho-bacteriorhodopsin back to iodopsin and bacteriorhodopsin) suggest that light energy is stored as a result of the interaction of a photon with rhodopsin. Resonance Raman spectra of the batho intermediate in several rhodopsins indicate that the -C=NH+ stretching vibration does not vary in going from rhodopsin to bathorhodopsin and this suggests that there is still a double bond ... |
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| Microwave Semiconductor Research-Materials, Devices, Circuits. |
19 JUL 1979 |
|
| Authors:
L. F. Eastman; J. Frey; G. C. Dalman; C. A. Lee; P. R. McIsaac; CORNELL UNIV ITHACA N Y
|
| Chromium doped pure LPE GaAs buffer layers have been tested to show that they do not conduct after baking with or without Si3N4 capping, and calibrated deep level transient spectroscopy has been used to measure the density of intended chromium traps as 3 to 4 x 10 to the 14th power/cu cm. Technology for obtaining quasi-Schottky barrier gates on quaternary compound semiconductor materials has been developed. A review of the ... |
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| Controlled Grain Boundary Structures in Superconductors. |
FEB 1979 |
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| Authors:
Edward J. Kramer; CORNELL UNIV ITHACA N Y
|
| The relationship between grain boundary structure and chemistry and the critical current properties of superconductors is being investigated. The critical current (flux pinning) contributed by single grain boundaries in Nb bicrystals has been observed and shown to be suprisingly large even for boundaries that should have no crystal anisotropy or stress field contribution to the elementary interaction force between a grain boundary and the flux line lattice. Transmission electron microscopy ... |
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| Dynamics of the Chemistry of Electronically Excited Atoms in Defined Quantum States. |
01 MAY 1978 |
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| Authors:
John R. Wiesenfeld; CORNELL UNIV ITHACA N Y
|
| The research program described in this report is concerned with the study of the chemistry of electronically excited halogen atoms in the gas phase. These atomic species are interesting not only in terms of developing model systems for understanding the general chemistry of electronically excited atoms, but also because of their importance in the fields of laser isotope separation and chemical laser development. In essence, this research concerns itself with ... |
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| Induction of Microbial Metabolism of Organophosphorus Compounds. |
DEC 1977 |
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| Authors:
M. Alexander; A. M. Cook; C. G. Daughton; CORNELL UNIV ITHACA N Y
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| Bacterial cleavage of the carbon-phosphorus bond was investigated. Bacteria were isolated that were capable of growing with one or more organophosphonates as sole sources of phosphorus. Cleavage of the C-P bond was shown for Pseudomonas putida growing with 2-aminoethylphosphonate and for Pseudomonas testosteroni growing with isopropyl hydrogen methylphosphonate, pinacolyl hydrogen methylphosphonate or dihydrogen methylphosphonate as sole phosphorus sources. Various metabolites were identified by gas chromatography and mass spectrometry. (Author) |
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| Air Diffusion Through Membranes in Triaxial Tests |
OCT 1977 |
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| Authors:
Wayne S. Pollard; Dwight A. Sangrey; Steve J. Poulos; CORNELL UNIV ITHACA N Y
|
| No abstract |
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| The Time to Failure of Cables Subjected to Random Loads. |
SEP 1977 |
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| Authors:
Howard M. Taylor; CORNELL UNIV ITHACA N Y
|
| The effect on cable reliability of random cyclic loading such as that generated by the wave induced rocking of ocean vessels deploying these cables is examined. A simple model yielding explicit formulas is first explored. In this model, the failure time of a single element under a constant load is assumed to be exponentially distributed, and the random loadings are a two state stationary Markov process. The effect of load ... |
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| Research on Molecular Lasers. |
31 AUG 1977 |
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| Authors:
George J. Wolga; Terrill A. Cool; Simon H. Bauer; Ross A. McFarlane; CORNELL UNIV ITHACA N Y
|
| The broad objectives of this research were to provide quantitative information concerning molecular and chemical lasers. The parameters dealt with were: new laser transitions and pumping schemes; laser gain and saturation parameters; measurements of relaxation and energy transfer between the translational, rotational, vibrational, and electronic modes of prominent laser molecules. |
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| Molecular and Chemical Laser Systems. |
25 JUL 1977 |
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| Authors:
John R. Wiesenfeld; George J. Wolga; CORNELL UNIV ITHACA N Y
|
| The work performed under the above referenced grants included: (a) Experimental study of the reaction system O + HI yielding OH + I or I* and O2('delta g) + I(2P3/2) in equilibrium with O2(3 sigma 9) + I*(2P1/2) in a flow system. Measurements of optical gain at the I atom laser wavelength of 1.315 microns indicated an optical loss of 3-8% across the transverse flow laser channel. (b) Parametric studies ... |
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| Dynamics of the Chemistry of Electronically Excited Atoms in Defined Quantum States. |
28 APR 1977 |
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| Authors:
John Wiesenfeld; CORNELL UNIV ITHACA N Y
|
| The deactivation of I(5 2 P1/2) by HBr and DBr has been shown to proceed via chemical reaction to form HI or DI + Br(4 2 P3/2). The corresponding deactivation by Br2 appears to result in the production of electronically excited Br(4 2 P1/2) as the result of an adiabatic reaction, suggesting the possible construction of a chemically pumped bromine atom laser. The photodissociation of Br2 has also been investigated ... |
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| Superconductivity in Nonstoichiometric Compounds. |
11 JAN 1977 |
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| Authors:
M. J. Sienko; CORNELL UNIV ITHACA N Y
|
| The objective of this research is to examine the effect of changing chemical composition on the properties of superconducting chemical compounds. Compounds likely to be superconducting are synthesized; properties are investigated as functions of departure from stoichiometry and cation-for-cation or anion-for-anion substitution. The special role of localized magnetic moments on quenching superconductivity is examined. (Author) |
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| Summary of Research Completed Under Contract N00014-76-C-0030. |
22 OCT 1976 |
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| Authors:
Richard L. Liboff; CORNELL UNIV ITHACA N Y
|
| Contents: An interpolation formula for the energy radiated by a point charge passing through a hole in a plate; A preliminary study of a hybrid fusion reactor at moderate temperature; Bohr Correspondence Principle for large quantum numbers. |
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| Noise Limitations of rf SQUIDS. |
05 OCT 1976 |
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| Authors:
Robert A. Buhrman; CORNELL UNIV ITHACA N Y
|
| In this paper a discussion is given of the noise sources and sensitivity limits of the rf biased SQUID. Both the low critical current inductive and the higher critical current hysteretic devices are considered. The intrinsic SQUID noise is treated by considering the internal flux response of a SQUID ring to an applied rf flux. While approximate, this approach yields the most direct picture of the nature of the intrinsic ... |
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| Wide-Band Microwave Amplifier Realizations in Microstrip Employing a GaAs Schottky-Barrier Field-Effect Transistor. |
AUG 1976 |
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| Authors:
R. B. Watson Jr; CORNELL UNIV ITHACA N Y
|
| This work deals with the realization of two 4-8 GHz flat-gain amplifier designs in microstrip using a single GaAs Schottky-barrier field-effect transistor. Two aspects of microstrip amplifier realization are considered. The first aspect is accurate realization of required lumped and distributed circuit elements. The second involves detailed mathematical modelling of practical circuit elements, permitting computer analysis and optimization of complete amplifier networks. After techniques for analysis and design of microstrip ... |
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| Assessment of Solid State Replacement of TWT Amplifiers for Satellite Communications. |
AUG 1976 |
111 pages |
| Authors:
G. C. Dalman; L. F. Eastman; C. A. Lee; J. Frey; W. Ku; CORNELL UNIV ITHACA N Y
|
 | This report summarizes the present state-of-the-art achievements of GaAs FET transistors, assesses their probable capabilities and the associated technology problems. Designs of FET high power amplifiers are included and it is noted that measured intermodulation distortion in these amplifiers is higher than anticipated. Finally it is shown that efficient high power GaAs Read diodes of the hard punch-on variety can satisfy the TWTA distortion specifications. Thus an FET/Read diode hybrid ... |
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| A Preliminary Study of a Hybrid Fusion Reactor at Moderate Temperature. |
21 JUL 1976 |
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| Authors:
Richard L. Liboff; CORNELL UNIV ITHACA N Y
|
| A hybrid fission-fusion system is investigated which operates in a moderate temperature range. The fuel is LiD which is a solid at room temperature. The fusion reaction is maintained by a neutron source from a fission reactor. For a spherically concentric system with interface radius equal to 5m, and a fission neutron flux of 10 to the 13th power/sq cm sec, tge output power due to fusion is estimated to ... |
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| Study of Molecular Lasers. |
01 JUN 1976 |
|
| Authors:
George J. Wolga; Simon H. Bauer; Ross A. McFarlane; Terrill A. Cool; CORNELL UNIV ITHACA N Y
|
| This report describes research conducted at Cornell University on molecular and chemical laser systems. The objective of this work has been to provide precise, quantitative information concerning: the rates with which vibrational and rotational molecular energy in important laser molecules is transferred to other molecules, redistributed among the degrees of freedom of the same molecule or relaxed by collisions with molecules or atoms; the temperature dependence of these rates; conditions ... |
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| Dynamics of the Chemistry of Electronically Excited Atoms in Defined Quantum States. |
28 APR 1976 |
|
| Authors:
John R. Wiesenfeld; CORNELL UNIV ITHACA N Y
|
| The investigation of excited state chemistry has centered on the photodissociation of alkyl iodides and subsequent chemistry of the photofragments. In addition studies have been made of the deactivation of Br(14)doublet P(1/2) by the hydrogen isotopes, the results being compared to previously reported theoretical calculations. The role of E-V transfer in such quenching processes is also considered. |
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| Investigation of Solution Epitaxial Growth and High-Field Electronic Properties of Indium Phosphide. |
08 DEC 1975 |
|
| Authors:
Lester F. Eastman; CORNELL UNIV ITHACA N Y
|
| This investigation covers an effort directed at the problem of obtaining Indium phosphide, by liquid phase epitaxy, for use in high-electric-field applications such as in microwave electron devices. It covers the area of determining the growth rate, the area of obtaining high purity, the area of alloyed contacts, and the determination of high-field properties. It is concluded that multiple-layer InP can be grown predictably and repeatably by liquid phase epitaxy ... |
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| Study of Molecular Lasers. |
NOV 1975 |
|
| Authors:
George J. Wolga; Simon H. Bauer; Ross A. McFarlane; Terrill A. Cool; CORNELL UNIV ITHACA N Y
|
| Research concerning molecular and chemical lasers was conducted in the following areas: (1) Vibrational relaxation measurements at T=300 K of HF(v=1),DF(v=1), CO2(001); (2) Collisional deactivation of CO(v=1) by oxygen atoms over the temperature range 273K to 390K; (3) Vibrational relaxation measurements in the HF-DF, HF-CO2 and DF-CO2 systems at very low temperatures; (4) Studies directed toward the measurement of the V to R rates of energy transfer in HF - ... |
|
| Advanced Concepts of Microwave Generation and Control in Solids. |
SEP 1975 |
|
| Authors:
G. C. Dalman; L. F. Eastman; C. A. Lee; J. Frey; CORNELL UNIV ITHACA N Y
|
| The emphasis of the investigation is centered on studies of active microwave effects in avalanche diodes, transferred electron diodes, microwave field-effect transistors, and on related microwave circuit, materials growth, and physical electronic techniques. In Section A, a report is made on the microwave solid state devices and circuits. Included are: Amplifier Properties; IMPATT Diode Load Characteristics; Interaction of Distributed IMPATT Oscillators; An IMPATT Diode Characterization; Microwave Transistor Studies; Compound Semiconductor ... |
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| Direct Measurements of Current-Phase Relations for Several Types of Superconducting Weak Links. |
AUG 1975 |
|
| Authors:
L. D. Jackel; J. M. Warlaumont; J. C. Brown; t. d. clark; M. T. Levinsen; CORNELL UNIV ITHACA N Y
|
| While recent theoretical and experimental evidence have indicated that many commonly used superconducting weak links might have distinctly nonsinusoiual current-phase relations, precise measurement of these relations has been difficult to realize. Now a high resolution technique has been developed for the measurement of current-phase relations of weak links. The authors have employed this technique to determine the current-phase relations of various weak link structures including point contacts, thin film microbridges ... |
|
| Dynamics of the Chemistry of Electronically Excited Atoms in Defined Quantum States. |
15 APR 1975 |
|
| Authors:
John R. Wiesenfeld; CORNELL UNIV ITHACA N Y
|
| The work described in this report involved the experimental and theoretical investigation of the chemistry of electronically excited atoms and molecules. The oxidation of Ba atoms by N2O was examined in terms of correlation rules based on the conservation of angular momentum. A mechanism was proposed for the observed efficient production of electronically excited BaO molecules. The photochemistry of alkyl iodides was studied using time-resolved atomic absorption spectrometry. The electronic ... |
|
| Impulse Noise Generators and Testing of Modems. |
MAR 1975 |
|
| Authors:
Yrjo Neuvo; Walter H. Ku; CORNELL UNIV ITHACA N Y
|
| The report presents results on the hardware implementations and testing of the impulse noise generators described in an earlier RADC technical report. The Prototype impulse noise generator consists of two separate units. Samples from the lognormal distribution are generated in one unit. Since the lognormal amplitude distribution is a frequently used model for impulse noise in wireline, this unit can be used directly to simulate the wireline impulse noise. The ... |
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| The Implications of Experiments on the Perception of Space and Motion. |
1975 |
|
| Authors:
James J. Gibson; CORNELL UNIV ITHACA N Y
|
| ;Contents: Evidence for the direct perception of surface layout; The discovery of visual kinesthesis; Experiments on the perception of changing surface layout; The apprehension of hidden surfaces. |
|
| The Structure and Decomposition of Titanium and Zirconium B.C.C. Solid Solutions. |
DEC 1974 |
|
| Authors:
Stephen L. Sass; CORNELL UNIV ITHACA N Y
|
| The research was concerned with studying the structure, the mechanical properties and the decomposition of Ti and Zr b.c.c. (e.g. Zr-Nb, Ti-V) solid solutions. The experimental techniques used in this study were electron microscopy, electron diffraction, elastic constant measurements and single crystal tensile testing. The purpose of this Final Report is to review the highlights of the research and point out important results. |
|
| THE STRESS-INDUCED OMEGA PHASE TRANSFORMATION IN TI-V ALLOYS |
NOV 74 |
|
| Authors:
T. S. Kuan; R. R. Ahrens; S. L. Sass; CORNELL UNIV ITHACA N Y
|
|
| Research on Molecular Lasers. |
NOV 1974 |
|
| Authors:
G. J. Wolga; Simon H. Bauer; Ross A. McFarlane; T. A. Cool; CORNELL UNIV ITHACA N Y
|
| Research concerning molecular and chemical lasers was conducted in the following areas: (1) Measurement of vibrational energy transfer rates in the HF, DF, HF-DF, HF-CO2, and DF-CO2 systems over the temperature range 200-350K; (2) Experimental design and testing of experiments to measure vibration to rotation energy transfer in HF; (3) Vibrational relaxation measurements at T = 300K of HF(v=1) DF(v=1) and CO2(001) by atoms including H,D,O,N,F,Cl, and Br; (4) Vibrational ... |
|
| The Dynamics of Cooperative Games. |
AUG 1974 |
|
| Authors:
Jeffrey H. Grotte; CORNELL UNIV ITHACA N Y
|
| It is of interest to the study of cooperative game theory to develop models whereby the dynamics of negotiation among the players can be investigated. One approach to this problem concentrates on the use of discrete transfer schemes to study how players might arrive at a desirable outcome. A parallel approach employs systems of differential equations whose solutions represent a continuous transfer of payoff over time. It is the intention ... |
|
| The Design and Analysis of an Expectancy Theory Model for Predicting Early Retirement. |
AUG 1974 |
|
| Authors:
Donald Fred Parker; CORNELL UNIV ITHACA N Y
|
| The research had two major goals: to design and test an extended expectancy theory motivational model to predict the choice between further service and early retirement, and to determine, based upon self-report measures whether objectively identifiable differences exist between subjects who have and have not chosen to retire early. A concurrent design was employed. Subjects of the study were 702 Regular Navy Officers who had previously attained retirement eligibility after ... |
|
| Study of Molecular Lasers. |
JUL 1974 |
|
| Authors:
George J. Wolga; Ross A. McFarlane; Simon H. Bauer; T. A. Cool; CORNELL UNIV ITHACA N Y
|
| The report describes research performed at Cornell University aimed at furthering the understanding of energy transfer and deactivation mechanisms in chemical and molecular lasers as well as the study of new laser systems and new chemical sources for laser systems. The methodology employed consists of laboratory experiments, data analysis including computer modeling, and literature review. Work is reported in several areas: (1) Measurement of the vibrational deactivation of HF(v=1), CO2(001) ... |
|
| Studies on Heating of a Plasma by Strong Turbulence and Relativistic Electron beam. |
30 JUN 1974 |
|
| Authors:
Charles B. Wharton; CORNELL UNIV ITHACA N Y
|
| Contents: Summary of turbulent heating contributions--plasma resistivity during turbulent heating; ion energy distribution for turbulent heating; saturation of turbulent heating; Summary of contributions: relativistic electron beam--diode and beam characteristics; plasma heating with foil-less diode REB; plasma heating with foil-anode diode REB; beam interaction with turbulent plasma; Diagnostic developments--neutral atom beam experiments; optical line broadening; ruby laser scattering. |
|
| Transport Mechanisms in Liquid Phase Epitaxial Growth of Gallium Arsenide. |
JUN 1974 |
|
| Authors:
Stephen Ingalls Long; CORNELL UNIV ITHACA N Y
|
| The influence of solute transport mechanisms on growth rates, thickness uniformity, and surface morphology of liquid phase epitaxially grown layers was studied theoretically and experimentally. Steady state diffusion theory was developed to relate temperature gradients, growth temperatures and substrate location to observed growth rates. A vertical steady-state epitaxy system was constructed which uses cylindrical symmetry to achieve good thermal uniformity. A numerical technique was used to calculate temperature distributions in ... |
|
| Binding, Valency and Charge Transfer in Chemical Reactions on Metal Surfaces. |
JUN 1974 |
|
| Authors:
Thor N. Rhodin; CORNELL UNIV ITHACA N Y
|
| Fundamental studies of microscopic parameters relating to the binding and reaction of single atoms and of monolayers of molecules and atoms on clean surfaces of single crystal surfaces of tungsten and of nickel have been completed. These measurements involve field electron emission, LEED intensity analysis, work function measurements and Auger electron analysis. The results make substantial contributions to the microscopic theory of chemical binding on metal surfaces and to the ... |
|
| DOUBLE CROSS MODULATION IN THE D-REGION, IN: AGARD CP-138, PAPER NO31 |
MAY 1974 |
|
| Authors:
G.C. RUMI; CORNELL UNIV ITHACA N Y
|
|
| Dynamics of the Chemistry of Electronically Excited Atoms in Defined Quantum States. |
19 APR 1974 |
|
| Authors:
John Wiesenfeld; CORNELL UNIV ITHACA N Y
|
| The design and construction of an apparatus for time-resolved atomic absorption spectroscopy is described and its usefulness in studying atom-molecule reactions is discussed. In particular, preliminary experiments involving measurement of the branching ratios for production of electronically excited atoms in metathetical reactions are reported and future investigations are considered in light of these early results. (Author) |
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| Detection, Study and Chemical Reactivity of Boron Intermediates Generated by High Temperature and Photochemical processes. |
15 FEB 1974 |
|
| Authors:
Richard F. Porter; CORNELL UNIV ITHACA N Y
|
| A brief summary of research activity on high temperature and photochemical intermediates in boron chemistry is presented. The work has resulted in approximately 50 technical publications in boron chemistry. Vibrational spectra have been obtained for the intermediates BH3 (borane) HBO and HBNH which has been isolated in low temperature matrices. Techniques were used for deriving thermochemical data for ionized boron species in the vapor phase. (Modified author abstract) |
|
| Surface Current Construction of Radiation Spectra. |
25 JAN 1974 |
|
| Authors:
Neal Maresca; CORNELL UNIV ITHACA N Y
|
| A technique is introduced which allows the spectral and angular distributions of radiation accompanying the interaction of a uniformly moving charge with a conducting surface to be obtained from surface currents constructed from solution of the associated electrostatic problem. Application of the technique further employs simple arguments involving causality, conservation of charge, and the Lorentz transformation. (Author) |
|
| Heat Induced Flow and Its Applications. |
JAN 1974 |
|
| Authors:
Neng Jong Yu; CORNELL UNIV ITHACA N Y
|
| A theoretical study of fluid flows with energy input is presented. Three problems are investigated: (1) Uniform flow with heat addition in various bounded regions; (2) unsteady cylindrical disturbances produced by a sudden energy release; (3) compressible boundary layer growth with volume heat addition inside the boundary layer. The first problem is steady two dimensional flows with simply shaped heating regions. In the second part, the linear and non-linear behavior ... |
|
| Research on Helicopter Noise. |
1974 |
|
| Authors:
William R. Sears; CORNELL UNIV ITHACA N Y
|
| The report summarizes research on helicopter noise under the following headings: Broadband noise; high-speed blade slap; and noise related to blade accelerations. |
|
| Magnetic Ordering of Rare Earth Ions at the Metal-Nonmetal Transition. |
31 DEC 1973 |
|
| Authors:
M. J. Sienko; CORNELL UNIV ITHACA N Y
|
| The objective of this research is to investigate the nature and mechanism of magnetic ordering at the metal-nonmetal transition. The approach is to synthesize new compounds in which the concentration of magnetic ions or conduction-band electrons could be varied independently in the neighborhood of the metal-nonmetal transition and measure magnetic parameters as a function of compound stoichiometry. Three kinds of systems were investigated: hexaborides, tungsten bronzes, and metal-ammonia compounds. |
|
| Analysis and Digital Hardware Realization of Non-Gaussian Impulse Noise in Wideband Communications Systems. |
OCT 1973 |
|
| Authors:
Walter H. Ku; Yrjo Neuvo; CORNELL UNIV ITHACA N Y
|
| aussian impulse noise source which can be used to model the impulsive noise present in wideband communications systems. The impulsive noise appearing on practical systems is characterized by bursts of much higher amplitudes than would be predicted by a normal- or Gaussian-distribution law. The impulse noise model and the actual hardware noise generator described in this paper are capable of producing Gaussian background noise, lognormal impulsive noise, and burst timing ... |
|
| Microbial degradation of polyesters: poly(caprolactone) degraded by P. pullulans . |
AUG 73 |
|
| Authors:
R. D. Fields; F. Rodriguez; R. K. Finn; CORNELL UNIV ITHACA N Y
|
| Poly(caprolactone) is degraded by the mold P. pullulans in the presence of other nutrients. The weight loss from solid polymer films covered by a nutrient agar gel on which colonies are growing is used to establish comparative rates of degradation. There is substantial loss (16 mg/square cm surface area) from a whole polymer of low (2,000) molec-ular weight in 3 weeks at 30 C. A high (27,500) MOLECULAR WEIGHT WHOLE ... |
|
| Advanced Concepts of Microwave Generation and Control in Solids. |
JUL 1973 |
|
| Authors:
G. C. Dalman; L. F. Eastman; C. A. Lee; F. Frey; CORNELL UNIV ITHACA N Y
|
| Control in Solids.Technical rept., 1 Jan-31 Mar 73,Dalman,G. C. ;Eastman,L. F. ;Lee,C. A. ;Frey,F. ;F30602-71-C-0110RADCTR-73-196(*microwave oscillators, *semiconductor diodes), microwave amplifiers, harmonic generators, avalanche diodes, silicon, l band, x band, field effect transistors, gallium arsenides, indium compounds, phosphides, ionization, doping, epitaxial growthlsa diodes, schottky barrier devices, semiconductor diodes, indium phosphides, ion implantation, avalanche diodesContents: Multi-Mesa TRAPATT fabrication, high frequency high efficiency avalanche oscillators, high frequency Pt-n-p+ diodes, BARITT devices, microwave field-effect ... |
|
| Fundamental Studies on Turbulent Heating of a Fusion Plasma. |
30 JUN 1973 |
22 pages |
| Authors:
Charles B. Wharton; CORNELL UNIV ITHACA N Y
|
| During the past year the investigation has continued of the scaling laws of turbulent heating and on optimizing the experiment as a pulsed plasma heating device. Three main conclusions have been reached from these investigations: The plasma resistivity is anomalously large during turbulent heating, approaching the Buneman value normally associated with the electron 2-stream instability, yet the observed turbulent spectrum is more appropriate for ion acoustic waves; the ion energy ... |
|
| Research on Molecular Lasers. |
15 APR 1973 |
|
| Authors:
George J. Wolga; Simon H. Bauer; Ross A. McFarlane; T. A. Cool; CORNELL UNIV ITHACA N Y
|
| Research concerning molecular and chemical lasers was conducted in the following areas: Measurement of V yield V and V yield R, T rates among hydrogen halide molecules and the temperature dependence of the energy transfer rates previously determined for HF, DF, HF/CO2 DF/CO2 Systems, Vibrational relaxation studies of CO2 in the pressure range 1-100 atm, Chemical laser studies of the reaction of atomic oxygen and acetylene, Computer modeling of the ... |
|
| Analysis of Sparse Elimination. |
JAN 1973 |
17 pages |
| Authors:
James R. Bunch; CORNELL UNIV ITHACA N Y
|
| An error analysis is presented for Gaussian elimination when the matrix is arbitrarily sparse. Error analyses for elimination on band matrices and full matrices follow as special cases. |
|
| The Design or Operation of Aircraft to Minimize Their Sonic Boom, |
1973 |
|
| Authors:
A. R. Seebass; CORNELL UNIV ITHACA N Y
|
| Means of reducing or eliminating the sonic boom through aerodynamic design or aircraft operation are discussed. These include designing aircraft to minimize or eliminate certain features of the overpressure signature, operating aircraft at slightly supersonic speeds so that the sonic boom does not reach the ground, and seeking reductions through the high altitude-high speed flight conditions of hypersonic transports. A simple computer program has been developed that determines the area ... |
|
| Triangular Factorization and Inversion by Fast Matrix Multiplication. |
DEC 1972 |
|
| Authors:
James R. Bunch; John E. Hopcroft; CORNELL UNIV ITHACA N Y
|
| The fast matrix multiplication algorithm by Strassen is used to obtain the triangular factorization of a permutation of any non-singular matrix of order n in (C sub 1)(n sup(log of 7 to the base 2)) operations, and hence the inverse of any non-singular matrix in (C sub 2)(n sup (log of 7 to the base 2)) operations. (Author) |
|
| Single-Element Tearing and Modification of Sparse Symmetric Systems. |
DEC 1972 |
|
| Authors:
James R. Bunch; Donald J. Rose; CORNELL UNIV ITHACA N Y
|
| Tearing and modification obtains the solution of a linear system synthetically by first solving a slightly different (torn) system and then modifying that solution. The authors show that single-element tearing of symmetric systems is rarely advantageous when the modified system is solved by elimination, and the authors classify those systems for which it is advantageous. (Author) |
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Reports by Corporate Author
