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Articles 5461 - 5490 of 5718
Full-Text Articles in Entire DC Network
Some Statistical Inferences For The Bivariate Exponential Distribution, Bruce Mohr Bemis
Some Statistical Inferences For The Bivariate Exponential Distribution, Bruce Mohr Bemis
Doctoral Dissertations
"The bivariate exponential distribution is neither absolutely continuous nor discrete due to the property that there is a positive probability that the two random variables may be equal. Basic properties of the distribution are presented as well as methods of parameter estimation including maximum likelihood. The distribution is shown to satisfy the usual regularity conditions in spite of its possession of a singularity. The maximum likelihood estimates are asymptotically efficient. Two other methods of estimation are compared with the maximum likelihood method in terms of efficiency. Tests of the hypothesis that two random variables each have independent exponential distributions versus …
Special Subrings Of Real, Continuous Functions, Paul Marlin Harms
Special Subrings Of Real, Continuous Functions, Paul Marlin Harms
Doctoral Dissertations
"Some lattice-ordered subrings of C(X) containing C*(X) are examined where X is a completely regular space. Each realcompact spaceY between [v]x and ßx is associated with a lattice-ordered subring of C(X) which is isomorphic to C(Y) and contains C*(X). The cardinal number of (ßX - [v]X) is a lower bound for the cardinal number of these subrings. Every prime ideal in each of these subrings is comparable with the intersection of the subring and a maximal ideal in C(X). The structure space of maximal ideals is studied for special subrings in C(X) containing CK(X), the continuous functions of …
X-Ray And Mössbauer Spectroscopy Studies Of The Silicon-Antimony And Bismuth-Antimony Alloys, James Ralph Teague
X-Ray And Mössbauer Spectroscopy Studies Of The Silicon-Antimony And Bismuth-Antimony Alloys, James Ralph Teague
Doctoral Dissertations
"X-ray and Mossbauer spectroscopy were used to investigate two antimony alloys, Bi-Sb and Si-Sb, showing semiconductorsemimetallic transitions or vice versa, depending on the antimony concentration in the host lattice. Resistivity and density measurements were found to be helpful in the analysis of the results. X-ray studies for dislocation-free antimony-doped silicon showed that the lattice constant of the alloy increased as the antimony concentration increased from 10¹⁸ to 10¹⁹ Sb atoms/cc. Rather good agreement was found between theoretical and experimental changes in lattice constant for dislocation-free silicon. Mössbauer studies showed that the isomer shift decreased linearly with increasing antimony concentration, which …
Low-Energy Electron Transport By The Method Of Discrete Ordinates, David E. Bartine
Low-Energy Electron Transport By The Method Of Discrete Ordinates, David E. Bartine
Doctoral Dissertations
"The one-dimensional discrete ordinates code ANISN has been adapted to simulate the transport of low-energy (on the order of a few MeV) electrons. Two different calculational techniques have been utilized for the treatment of electron-electron collisions that result in a small energy transfer. One method treats such collisions by a continuous slowing-down approximation, while the other method treats these collisions by the use of a very approximate cross section. Calculated results obtained with ANISN are compared with experimental data for the transmitted energy and angular distributions for 1-, 2.5-, 4-, and 8- MeV electrons normally incident on aluminum slabs of …
Some Metal Complexes Of Dihydroxycyclobutenedione, Stewart Michael Condren
Some Metal Complexes Of Dihydroxycyclobutenedione, Stewart Michael Condren
Doctoral Dissertations
"This study involves an investigation of some of the physical and chemical properties of the trivalent metal squarate complexes of iron, vanadium, and indium in order to determine their structure. In this investigation studies were made of the infrared spectra, electronic spectra, x-ray diffraction powder photographs and diffractometer patterns, magnetic susceptibilities, and thermogravimetric patterns for the trihydrate, dihydrate, and anhydrous squarate complexes of vanadium(III) and iron (III) and the dihydrate squarate complex of indium(III). These studies suggest that the structures of the vanadium(III) and iron(III) squarate complexes are dimeric with hydroxyl bridges between the metal atoms. This is supported by …
Chlorobenzene As A Differentiating Solvent For The Oscillometric Titration Of Weak Organic Bases, K Jagan Mohan Rao
Chlorobenzene As A Differentiating Solvent For The Oscillometric Titration Of Weak Organic Bases, K Jagan Mohan Rao
Doctoral Dissertations
No abstract provided.
Asymmetric Grignard And Meerwein-Ponndorf-Verley Reductions Long Range Asymmetric Synthesis And The Reduction Of Perfluoroalkyl Carbonyl Compounds, Robert Worrell Ridgway
Asymmetric Grignard And Meerwein-Ponndorf-Verley Reductions Long Range Asymmetric Synthesis And The Reduction Of Perfluoroalkyl Carbonyl Compounds, Robert Worrell Ridgway
Doctoral Dissertations
No abstract provided.
Radiative Mean Lives Of Some Excited Electronic Terms In Atomic And Ioniccarbon Using Beam-Foil Excitation, David John Pegg
Radiative Mean Lives Of Some Excited Electronic Terms In Atomic And Ioniccarbon Using Beam-Foil Excitation, David John Pegg
Doctoral Dissertations
No abstract provided.
A Practical Comparison Of Atomic Fluorescence Flame Spectrometry With Atomic Absorption Flame Spectrometry, Michael Andrew Pleva
A Practical Comparison Of Atomic Fluorescence Flame Spectrometry With Atomic Absorption Flame Spectrometry, Michael Andrew Pleva
Doctoral Dissertations
No abstract provided.
One-Center Expansion Wave Functions And The Hellmann-Feynman Theorem, James Joseph Eberhardt
One-Center Expansion Wave Functions And The Hellmann-Feynman Theorem, James Joseph Eberhardt
Doctoral Dissertations
No abstract provided.
Studies On The Biology Of Indo-Pacific Terebridae, Bruce A. Miller
Studies On The Biology Of Indo-Pacific Terebridae, Bruce A. Miller
Doctoral Dissertations
No abstract provided.
Polyphenol Oxidase And Phenolics As Related To Single Gene Resistance Of Tomato To Phytophthora Infestans, Richard Scott Warren
Polyphenol Oxidase And Phenolics As Related To Single Gene Resistance Of Tomato To Phytophthora Infestans, Richard Scott Warren
Doctoral Dissertations
No abstract provided.
Study Of Ellipsoidal Symmetry Relations In Heavily Doped N-Germanium, Dwight Morton Harris
Study Of Ellipsoidal Symmetry Relations In Heavily Doped N-Germanium, Dwight Morton Harris
Doctoral Dissertations
No abstract provided.
Genetics Of An Albino Mutant In Smooth Bromegrass (Bromus Inermis Leyss), Muhammad Nasiruddin
Genetics Of An Albino Mutant In Smooth Bromegrass (Bromus Inermis Leyss), Muhammad Nasiruddin
Doctoral Dissertations
No abstract provided.
Psychological Thought Within The Context Of The Scientific Revolution, 1665-1700, Barbara Carr Ross
Psychological Thought Within The Context Of The Scientific Revolution, 1665-1700, Barbara Carr Ross
Doctoral Dissertations
No abstract provided.
Selective Attention Behavior As Predicted By Adler's Social Interest Hypothesis, R John Huber
Selective Attention Behavior As Predicted By Adler's Social Interest Hypothesis, R John Huber
Doctoral Dissertations
No abstract provided.
The Microbial Ecology Of Sulfur Transformations In Oyster Pond, Woods Hole, Massachusetts, Frank W. Barvenik
The Microbial Ecology Of Sulfur Transformations In Oyster Pond, Woods Hole, Massachusetts, Frank W. Barvenik
Doctoral Dissertations
No abstract provided.
Binary Molecular Diffusivities In Liquids: Prediction And Comparison With Experimental Data, Ronald Dean Mitchell
Binary Molecular Diffusivities In Liquids: Prediction And Comparison With Experimental Data, Ronald Dean Mitchell
Doctoral Dissertations
"The Eyring rate theory equation has been modified successfully to enable predictions of binary molecular diffusivities for a wide variety of liquid-liquid systems. The activation free energy for binary diffusion has been evaluated in terms of the activation free energies for self diffusion of the solvent and solute. This was accomplished through the use of regular solution theory by relating the bond breaking energy of the jump step to the bond breaking energy in evaporation. Diffusivities estimated by this equation and the equations developed by Olander, by Gainer and Metzner, and by Wilke and Chang were compared with experimental data. …
An Sem Surface Study Of Nucleate Pool Boiling Heat Transfer To Saturated Liquid Nitrogen Reduced Pressures From 0.1 To 0.9, David Virgil Porchey
An Sem Surface Study Of Nucleate Pool Boiling Heat Transfer To Saturated Liquid Nitrogen Reduced Pressures From 0.1 To 0.9, David Virgil Porchey
Doctoral Dissertations
"This study constituted an examination of both nucleate boiling and maximum heat flux characteristics of liquid nitrogen boiling from characterized surfaces. Several textures of gold plated copper surfaces were studied in addition to silver and silver oxide surfaces. Data were taken over a wide range of reduced pressures. All surfaces were examined using a Scanning Electron Microscope (SEM). Data and micrograph comparison revealed that both surface chemistry and surface roughness affect the nucleate boiling characteristics of liquid nitrogen. These effects are separated from each other showing that nucleate boiling is a function of both surface chemistry and topography. Surface roughness …
Radiative Lifetime Of The A¹Π State And The Transition Moment Variation Of The Fourth Positive Band System Of Carbon Monoxide, Joseph George Chervenak
Radiative Lifetime Of The A¹Π State And The Transition Moment Variation Of The Fourth Positive Band System Of Carbon Monoxide, Joseph George Chervenak
Doctoral Dissertations
"The lifetime of the A¹π state of carbon monoxide has been measured using a pulsed invertron excitation source and delayed coincidence measurement technique on the fourth positive system. Eighteen bands, originating from the upper states v' = 0 to 5, were examined at pressures between 500 and 50 microns, with no pressure dependence noted. The data were corrected for photon "pile up" and least-squares fitted to the sum of two exponentials. The transition moment was found to vary and was expanded about the r-centroid of the v' = 0 to v" = 0 transition. Oscillator strengths are calculated and compared …
A Coordinate Oriented Algorithm For The Traveling Salesman Problem, Joseph Sidney Greene
A Coordinate Oriented Algorithm For The Traveling Salesman Problem, Joseph Sidney Greene
Doctoral Dissertations
"The traveling salesman problem may be stated as follows: "A salesman is required to visit each of n given cities once and only once, starting from any city and returning to the original place of departure. What route should be chosen in order to minimize the total distance traveled?" A new algorithm is developed which gives a good approximation to the solution for a large number of cities using reasonable computer time and which will converge to the exact solution if allowed to continue. This algorithm is a branch and bound technique which utilizes the distance between cities in its …
A Heuristic Algorithm For Determining A Constructive Suboptimal Solution To The Combinatorial Problem Of Facility Allocation, Harry Kerry Edwards
A Heuristic Algorithm For Determining A Constructive Suboptimal Solution To The Combinatorial Problem Of Facility Allocation, Harry Kerry Edwards
Doctoral Dissertations
"The major problem in plant layout is to determine the most economical relative location of facilities. There are two distinct types of suboptimal solutions to this combinatorial problem: construction and improvement. The writer has developed Modular Allocation Technique (MAT) which is the first useful construction suboptimal technique. The MAT general algorithm, a theorem relating the MAT solution to the optimal solution and an example problem are given. A computer program has been written that will apply MAT to the allocation problem for a maximum of 40 facilities. Results are given to demonstrate how MAT solutions may be used as initial …
A Simulation And Diagnosis System Incorporating Various Time Delay Models And Functional Elements, David Michael Rouse
A Simulation And Diagnosis System Incorporating Various Time Delay Models And Functional Elements, David Michael Rouse
Doctoral Dissertations
"The application of digital simulation to all phases of digital network design is considered here as oppossed [sic] to development of simulation for one or two restricted parts of the digital process. For this reason a simulator is presented which can be consistent by varying the level of expression from the simulation of architectural structures to such detailed simulation requirements as race analysis of asynchronous sequential circuits. In order to make system simulation more than just an idea, it must be capable of handling large circuits in reasonable times. It is demonstrated that functional simulation has the potential to increase …
A Quasi-Lattice Model Of Simple Liquids, Jesse Herbert Collins
A Quasi-Lattice Model Of Simple Liquids, Jesse Herbert Collins
Doctoral Dissertations
"A cellular model of simple liquids is proposed which eliminates the objectionable feature of long range order found in other cell models. The volume is divided into N identical spherically symmetric cells, each occupied by one molecule. The cell-center density distribution relative to an average given cell center forms a series of Gaussian peaks whose width is proportional to the square root of the distance from the given cell center. The number of cell centers and average radial distance represented by each of the peaks correspond to a face-centered cubic lattice. The molecular pair distribution function is determined for several …
A Study Of Far Infrared Grid Filters, Harold Victor Romero
A Study Of Far Infrared Grid Filters, Harold Victor Romero
Doctoral Dissertations
"The diffraction theory for the transmission of electromagnetic fields through a grid in a dielectric is derived and experimentally checked in the visible wavelength region. In the far infrared, an approximate mathematical representation is found to describe the grids in dielectrics. The empirical equations in the far infrared are combined with the electrical circuit-transmission line analog for inductive grids. Detailed structure of the transmittance versus wave number curves are presented. Then the theory of multielement grid filters is derived and compared with experiment. The properties of the filters can be predicted from a knowledge of the characteristics of the individual …
A Three-Dimensional Mathematical Simulator Of Multiphase Systems In A Petroleum Reservoir, Leonard Koederitz
A Three-Dimensional Mathematical Simulator Of Multiphase Systems In A Petroleum Reservoir, Leonard Koederitz
Doctoral Dissertations
"A generalized digital analysis for calculating three phase, three dimensional flow in reservoirs is developed. The computerized mathematical model is applicable to depletion drive, gas injection, water injection, and/or aquifer drive systems with modifications specific to the simulation criterion of that type of drive and includes fluid compressibility effects, gravity drainage and capillary pressure. The simulation allows arbitrary consideration of reservoir heterogeneity, geometry, well locations and rates of production. An innovation to the alternating direction technique for linear differential equations discussed by Brian is developed and employed in order to render the method of solution applicable to non-linear differential equations. …
Absolute Excitation Cross Sections Of He⁺ In 20-100 Kev He⁺-He Collisions Using Energy-Loss Spectrometry, Donald Roy Schoonover
Absolute Excitation Cross Sections Of He⁺ In 20-100 Kev He⁺-He Collisions Using Energy-Loss Spectrometry, Donald Roy Schoonover
Doctoral Dissertations
"Application of positive-ion energy-loss spectrometry has been extended to include experimental determination of absolute excitation cross sections of ground state helium ions. Helium ion-atom collisions were studied for impact energies ranging between 20-100 keV, in 10 keV intervals. The data were taken with an apparatus resolution between 0.6-o.8 eV FWHM. Cross sections for transitions from ground state to the second and third principal quantum levels of the ion plotted as a function of impact energy were still rapidly increasing at 100 keV. The cross sections at this energy were 1.64(± 0.28) x 10⁻¹⁸cm² for He⁺(l²s1/2) -> He⁺(n = …
An Investigation Of Nucleate And Film Boiling Heat Transfer From Copper Spheres, William David Hardin
An Investigation Of Nucleate And Film Boiling Heat Transfer From Copper Spheres, William David Hardin
Doctoral Dissertations
"This study consisted primarily of a laboratory investigation involving nucleate and film boiling heat transfer from copper spheres with saturated liquid nitrogen at atmospheric pressure. An initial study was directed towards obtaining reproducible boiling heat flux versus ΔT curves in the nucleate boiling region from surface conditions created by single and/or multiple glass bead peenings. The variables of bead size, nozzle line operating pressure, and distance a copper surface should be placed from the nozzle outlet were checked. The results indicated that a final peening of the surface with 0.0017-0.0035 inch diameter glass beads, a nozzle line pressure of approximately …
Completeness And Related Topics In A Quasi-Uniform Space, John Warnock Carlson
Completeness And Related Topics In A Quasi-Uniform Space, John Warnock Carlson
Doctoral Dissertations
"Completions and a strong completion of a quasi-uniform space are constructed and examined. It is shown that the trivial completion of a T₀ space is T₀ . Examples are given to show that a T₁ space need not have a T₁ strong completion and a T₂ space need not have a T₂ completion. The nontrivial completion constructed is shown to be T₁ if the space is T₁ and the quasi-uniform structure is the Pervin structure. It is shown that a space can be uniformizable and admit a strongly complete quasi-uniform structure and not admit a complete uniform structure. Several counter-examples …
Development And Application Of Cartesian Tensor Mathematics For Kinematic Analysis Of Spatial Mechanisms, Robert Myrl Crane
Development And Application Of Cartesian Tensor Mathematics For Kinematic Analysis Of Spatial Mechanisms, Robert Myrl Crane
Doctoral Dissertations
"The complexity of spatial mechanisms in themselves and the absence of an attractive analytical tool for their study has left this field of engineering analysis largely unexplored. In recent years several analytic methods have emerged. One of the most attractive of these is the tensor method. Literature surveys reveal that the tensor method is largely unexploited in the U.S.A., with regard to spatial mechanisms as well as simpler kinematic problems. The purpose of this work is to develop tensor mathematics for application to the kinematic analysis of spatial mechanisms. Methods are developed for position solutions and the determination of velocities …