Digital Commons Network^™

The Performance Of Full Response Multi-H Modems In Practical Environments, Mark Alan Wickert

Doctoral Dissertations

The power and bandwidth efficiency of multi-h continuous- phase modulation (CPM) schemes in practical environments are considered. Specific impairments considered are transmitter filtering, amplitude limiting, and receiver symbol timing, phase error, and decision depth sensitivities. A coherent receiver model is employed which uses the Viterbi algorithm (VA) to perform maximum likelihood sequence estimation. For (2/4,3/4), ll (3/8,4/8) and (4/8,5/8) linear phase codes, a signal-to noise ratio (SNR) power gain of 1.85 dB, 1.9 dB, and 2.4 dB at a bit error rate (BER) of 10^-5 over differentially coded minimum-shift keyed (MSK) modulation are obtained, respectively. With transmitter filtering the …

The Precambrian Volcanic Stratigraphy And Petrology Of The Des Arc Ne 7 1/2 Minute Quadrangle, South Central St. Francois Mountains, Missouri, Vernon Max Brown

Doctoral Dissertations

"The Precambrian volcanics in the Des Arc NE 7½ minute quadrangle are composed predominantly of rhyolitic ash-flow tuffs with minor rhyolitic, trachytic, and andesitic lavas, and basaltic dikes. Thirty-seven volcanic units were identified, mapped, and informally named. A minimum of 1,000 meters of volcanic section is present. The rhyolites consist of phenocrysts of albitized alkali feldspar, albitic plagioclase, quartz, opaques, and ferromagnesium relicts set in a devitrified and locally recrystallized felsitic matrix. Pumice and lithophysal structures are common in the ash flows.

Chemically, the rhyolites are quite similar. The potassium to sodium ratio in individual units, however, tends to vary …

Morpho-Physiological Factors Affecting Plant Productivity In Bush And Vine Forms Of Winter Squash (Cucurbita Maxima Duch), Cyril Emery Broderick

Doctoral Dissertations

The productivity of a new bush winter squash cultivar ('Autumn Pride') was compared to that of 'Blue Hubbard', a high-yielding vine cultivar. Yields of 'Autumn Pride' increased with increasing plant density and, at high plant densities, were greater than yields of 'Blue Hubbard' at its near optimum plant density.

Several factors could have contributed to the higher yield potential of 'Autumn Pride'. CO(,2) compensation points were determined to be 38 ppm and 77 ppm CO(,2) for 'Autumn Pride' and 'Blue Hubbard', respectively, at 30(DEGREES)C. 'Autumn Pride' had two layers of palisade parenchyma cells, occupying 74 percent of the mesophyll. In …

On A Conjugate Class Of Subgroups Determined By A Formation, Mark Challis Hofmann

Doctoral Dissertations

This thesis is an investigation of the interrelationships between a formation f, a finite solvable group G, and G(,f) the residual of f in G. This study is developed by introducing the f-subgroups. It is proven that the f-subgroups of G form a characteristic conjugacy class of CAR-subgroups of G. Moreover these subgroups generate G(,f). As a result, G is an element of the formation f if and only if an f-subgroup is equal to the identity subgroup.

It is established that an f-subgroup is a product of known subgroups of the f-residual. The covering and avoidance properties of f-subgroups …

Nonuniformly And Randomly Sampled Systems, George Dimitrios Kontopidis

Doctoral Dissertations

Problems with missing data, sampling irregularities and randomly sampled systems are the topics covered by this dissertation.

The spectral analysis of a series of periodically repeated sampling patterns is developed. Parameter estimation of autoregressive moving average models using partial observations and an algorithm to fill in the missing data are proved and demonstrated by simulation programs. Interpolation of missing data using bandlimiting assumptions and discrete Fourier transform techniques is developed. Representation and analysis of randomly sampled linear systems with independent and identically distributed sampling intervals are studied. The mean, and the mean-square behavior of a multiple-input multiple-output randomly sampled system …

Clinical Applications Of Chemiluminescence Detection, Mary Lynn Ann Grayeski

Doctoral Dissertations

This dissertation evaluates the potential of chemiluminescence analysis for two types of clinical applications: (1) rapid analysis with a flow injection system which consumes small reagent volumes (25 (mu)L) and (2) a new approach to chemiluminescence immunoassay.

The first application studied uses the firefly reaction with a flow system to analyze for adenosine triphosphate (ATP). Two flow configurations called the "valve within a valve" and "merging zones" configurations were evaluated with respect to effect of parameters such as flow and sample volume on precision, sensitivity and sample throughput. With the appropriate choice of parameters, both systems achieve precisions of 1-2% …

The Comic Dimension: A New Reading Of William Carlos Williams' Long Poem "Paterson", Kathleen Douglas Matthews

Doctoral Dissertations

When Williams decided in the early forties to accelerate work on the "magnum opus" he had begun fifteen years earlier, his ambitions were enormous, yet the literary establishment treated him more like a pygmy than a giant. T. S. Eliot, reigning literary pontiff, embraced the European literary tradition and ignored Williams as he had for years while Pound used Italy as a base for the economic and political tirades which eventually had him condemned as a traitor. In his long poem Paterson, Williams felt abandoned with the momentous task of discovering a poetics to fit the American idiom. His poem …

Multiple Scattering From A Random And Inhomogeneous Slab, Haci-Murat Hubey

Doctoral Dissertations

The reflection and transmission functions of an inhomogeneous slab are calculated by labeling the wave by the number of reflections it has undergone in the medium. The Riccati equation, satisfied by the reflected amplitude, is decomposed into a finite set of linear equations by taking into account the number of scatterings taking place inside the medium and is solved by a novel iterative approach. The order-of-scattering reflection functions method presented here and the coupled integral equation approach of the Bremmer solutions for the internal fluxes are set in a unified frame. The solutions of the Riccati equation are computed numerically …

Predicting The Formation Of Condensation Ash From Coal Combustion, Shu-Mu Hsieh

Doctoral Dissertations

This study predicts the nature of condensation ash formed from direct combustion of coal. Three coal-fire combustors, a cyclone-fired (CF) boiler, a pulverized-fuel (PF) and a drop tube (DT) furnace were considered.

Predictions were based on the hypothesis that condensation ash is formed through two consecutive steps: vaporization and recondensation. Metal-containing species in coal are believed to vaporize during high temperature combustion. These vapors then diffuse and condense at the bulk gas phase.

The amount of metal-related vapor transport to the bulk gas phase is dictated by char surface composition which is, in turn, determined by the temperature history of …

Synthesis And Characterization Of Model Aquatic Particulates For Use In Sorption Studies, Frederick William Page

Doctoral Dissertations

The synthesis and characterization of single- and multi-component model aquatic particulars is the object of this dissertation. Particulates were synthesized from illite, humic and fulvic acids, and iron, aluminum, and manganese hydrous oxides. Characterization included measurement of cation exchange capacity (CEC), and attempts to determine surface area and the pH of zero point of charge. Each of these methods was tested to determine their applicability to aquatic particulates, and attempts were made to improve the methodology.

CEC varied with composition and time of aging. Pure hydrous oxides exhibited decreases in CEC over time. Aging effects were also shown by aluminum …

The Heterogeneous Nucleation Of Ice On Ion Implanted Silicon, William Henry Stinebaugh

Doctoral Dissertations

"Ice crystal nucleation on 1 80 keV Si⁺ ion implanted silicon was investigated experimentally at three different temperatures: T = - 20 °, - 24 °, and -30 ° C. The ion doses ranged from 4 .0 x 10¹⁴ ions/cm² to 5 .0 x 10¹⁵ ions/cm². The supersaturation dependence of ice nucleation on the ion implanted samples at these three temperatures was observed by controlling the substrate temperature and relative humidity independently.

An enhanced ice nucleation activity was observed on samples implanted with ion doses in the range of (1.6 - 2.0) x 10 …

Gaseous Reactions In Heteroporous Media, Elmer Anthony Klavetter

Doctoral Dissertations

"A modified dusty-gas model which accounts for the effects the pore-size and tortuosity distributions have on the mass fluxes in heteroporous media is presented. The behavior of the dusty-gas model (homoporous model) can be obtained from the modified model when the pressure is either very low or very high as well as for intermediate pressures when the characteristic parameter of the introduced tortuosity function has a very small value. When the pressure is very high or very low, all pores in the porous medium are almost in a single transport regime of either molecular or Knudsen diffusion.

Comparisons of the …

A Dwba Study Of Atom-Diatom Rearrangement Collisions, Randall Wayne Emmons

Doctoral Dissertations

"The role of the transferred angular momentum in state-to-state atom-diatom reactive scattering is investigated. Using the F+H₂ reactive system in this model study, it is found that many features in the state-testate differential and total cross-sections can be qualitatively explained. In particular, a maximum total cross-section occurring in a vibrational manifold of HF can be shown to occur due to an angular momentum match"-- Abstract, p. ii

Comparative Study Of The Boundary Element Technique And The Finite Element Method In Two Dimensional Eigenvalue Problem, Farough Baradari

Doctoral Dissertations

"In this work we investigate the applicability of a "Boundary Element method 11 for the numerical solution of the Liouville and Helmholtz eigenvalue problem for different two-dimensional geometries including a typical reactor configuration. The method is based on the discretization of the unknown along the boundary and Green's function representation of the governing equation.

To compare the capability of this method with the finite element method, a finite element code which uses quadratic quadrilateral isoperimetric elements was developed. A boundary element code was also written. These codes were used to determine the fundamental eigenvalue for several two-dimensional geometries -- square, …

Extensions, Generalizations, Characterizations And Testing For Independence Through Infinite Divisibility, Edward Joul Danial

Doctoral Dissertations

This dissertation investigates various related topics around the exciting concept: "Infinite Divisibility." First, two intricate distributions, namely, the univariate generalized Waring and the hyper-Poisson are proved to be infinitely and noninfinitely divisible, respectively. Analysis and computer approaches are employed. This itself extends the use of some results introduced by Katti, Steutel and Warde. Secondly, generalizations to Warde, Katti and Steutel's sufficient conditions and related results are achieved. Then, numerical application is presented. Thirdly, characterizations through infinite and finite divisibility are obtained. The Poisson, negative binomial, geometric, Bernoulli and uniform c haracterizations in terms of infinite divisibility are deduced. Some of …

Mineralogical, Textural, And Paragenetic Studies Of Selected Ore Deposits Of The Southeast Missouri Lead-Zinc-Copper District And Their Genetic Implications, Kenneth Bruce Horrall

Doctoral Dissertations

“A detailed paragenetic study of Pb-Zn-Cu ores from the Viburnum Number 28, Brushy Creek, and Goose Creek mines in the Southeast Missouri lead district indicates a complicated paragenesis characterized by repeated periods of mineral deposition. The sequence is composed of nineteen minerals including abundant galena, sphalerite, chalcopyrite, pyrite, marcasite, dolomite, calcite, and quartz and minor siegenite, bornite, bravoite, blaubleibender covellite, covellite, gersdorffite, digenite, enargite, tennantite, dickite, and malachite.

The paragenesis indicates that the ore solutions evolved in the following order: (1) Cu-rich, (2) Co-Ni-rich, (3) Pb-Zn-rich, and (4) Fe-rich. Subsequent repeated generations include cubic galena, later sphalerite, and minor crystalline …

The Sociological Critique Of American Sociology, 1960-1978: Its Shortcomings And Its Promise, Gerald Allen Ginocchio

Doctoral Dissertations

This dissertation represents an attempt to explicate and critically analyze an important movement in contemporary American sociology. This movement, which I am calling the sociological critique of American sociology, aimed to change predominant trends in American sociology. Basic tenets of sociological practice were called into question, such as the principle of value neutrality, an empirical methodology, and a functionalist theoretical framework. The goal of this critical movement was to bring about a more significant sociology, a sociology which would lead the way to the realization of a more humane social order. In general, however, the criticisms offered by these critical …

Diffusion Controlled Vinyl Polymerization, Sung Kuk Soh

Doctoral Dissertations

It is well known that the polymerization rate and the molecular weight distribution of vinyl polymers can change markedly during the course of polymerization and that these changes are due to the influence of self-diffusion upon the termination reaction. This phenomenon is commonly referred to as the gel effect and in order to explain the polymerization behavior after the onset of the gel effect, the chain length dependence of the termination reaction should be considered.

A new method of handling polymerization kinetics with the chain length dependence termination reaction is proposed, which is largely independent of the form of the …

Special Applications Of Irreversible Thermodynamics, Yakov Michael Zilberberg

Doctoral Dissertations

Thermodynamic analysis of various physical phenomena, chemical processes, and industrial installation has become a very important part of engineering work. The evergrowing sophistication of the contemporary technical world has brought about the necessity of extensive developments and applications in the field of Irreversible Thermodynamics which enables one to efficiently treat phenomena that are spatially and temporally non-equilibrium ones, and therefore thermodynamically irreversible. The unavoidable facts that all industrial processes experience randomly distributed external and internal excitations, and also that their variables, being automatically controlled, fluctuate in space in time, require a systematic improvements of the adopted methods of Irreversible Thermodynamic …

Water Quality Impact Of Non-Point Source Contaminants In Small Tidal Rivers, Edward John Schmidt

Doctoral Dissertations

An integrated numerical modeling methodology was developed for analysis of non-point contaminant production and water quality impacts in estuarine receiving waters. The methodology was calibrated against contaminant source observations and estuarine data.

Contaminant source loading is based on the runoff curve number technique combined with a partial contributing area approach. Sediment washoff is used as an indicator of contaminant quantities.

Hydrographs and contaminant load time series are introduced into a set of one-dimensional estuary models. Freshwater flow and tidal height are forcing functions for dynamic computation of velocity and water surface profiles. The effect of longitudinal salinity distribution is included …

How Communication And Confirmatory Strategies Affect The Search For Truth, Michael Ernest Gorman

Doctoral Dissertations

Scientific reasoning has become a topic of recent psychological research. Studies have focused on Karl Popper's idea that scientists should try to falsify, or disconfirm, their hypotheses instead of verifying them. Results indicate that both scientists and college students prefer to use confirmatory logic on simple tasks that model scientific reasoning. The only attempt to instruct subjects to use disconfirmatory reasoning failed (Mynatt, Doherty & Tweney, 1977) though subjects that falsified on their own initiative were more successful than subjects who tried to confirm.

All the studies of scientific reasoning have focused on individuals. But major advances in science are …

Load And Resistance Factor Design Of Cold-Formed Steel Structural Members, Boonsong Supornsilaphachai

Doctoral Dissertations

"In a traditional design, the Allowable Stress method has long been used for the design of cold-formed steel structures. In this design approach, the allowable stress is always used to prevent the possible structural failure by using an appropriate factor of safety selected primarily on the basis of engineering judgment and long-time experience.

Recently, the concepts of risk and reliability analysis have been successfully applied to many fields of engineering. By applying the theories of probability and statistics, the load and resistance design criteria for steel structures have been developed for the design of hot-rolled steel shapes and built-up members. …

Electron Transport Coefficients And Excitation Processes In Gaseous Mixtures Containing Mercuric Bromide, Howard Lundgren Brooks

Doctoral Dissertations

"A comprehensive set of measurements of the electron drift velocities and apparent ion formation cross sections has been completed for gaseous mixtures containing mercuric bromide using electron swarm techniques. Results are presented for binary mixtures of HgBr₂ and the rare gases neon, argon and xenon, with the concentration of HgBr₂ varied from 0.01% to 0.2% of the total. None of the measured quantities show a temperature dependence from 100 ° C to 150 ° Cover the range studied from 1 to 100 Townsend (1 Townsend = 1 Td = 10^-17 volt•cm²) in all of the …

Kinetic Processes In A High Pressure Laser Generated Plasma, Danny Joe Krebs

Doctoral Dissertations

"A dense sodium vapor in a high-pressure noble buffer has been simultaneously excited by short (4 ns) laser pulses from two lasers: ii the first tuned to one of the 'D' line transitions and the second tuned to either the photoionization threshold of the 3p states near 406 nm or to a higher level 3p-nd resonance. The population densities of the excited levels of atomic sodium were measured with temporal resolution by absolute intensity measurements of excited state fluorescence. At early times (~100 ns), excited state populations are determined by energy transfer collisions between two laser-excited 3p atoms while the …

An Investigation Of The Nickel-Cobalt Occurrence In The Southeast Missouri Mining District, David Ray Jessey

Doctoral Dissertations

"A study of the occurrence of nickel and cobalt in the Southeast Missouri Mining District has revealed several significant geochemical trends and mineralogical relationships. Regional geochemical studies indicate that the greatest concentration of nickel and cobalt occurs in the Fredericktown area. Mines in the Viburnum Trend also have significant concentrations of these metals. Studies of the Viburnum Trend have established that both nickel and cobalt decrease in concentration southward from the Magmont mine to the Brushy Creek mine, increase at the Fletcher mine, and decrease again at the Sweetwater mine.

A detailed geochemical study of the Buick mine has shown …

Boron Implanted Strontium Titanate, Connie Macdonald Cooper

Doctoral Dissertations

"Single crystals of strontium titanate implanted with boron were found to have highly conductive surface layers. The effects of varying dose from 10¹⁶ to 10¹⁷ ions/cm², implantation voltage from 50 to 75 keV, and annealing conditions on the room temperature surface resistance and Hall mobility are presented in this study. A major result is that, for the most part, variation of the implantation voltage did not have a major effect on the sheet resistances obtained by boron implantation of strontium titanate, while dose and annealing conditions have major effects.

Doses of 5 X 10¹⁶ ions/cm …

A Thermochemical Study Of The Ore Deposits Of The Milliken Mine, New Lead Belt, Missouri, Douglas L. Rickman

Doctoral Dissertations

"The ore body at the Milliken mine is a typical Mississippi Valleytype ore deposit. Mineralization is in a dolostone and structures are subtle, but very important ore controls. The major mineralogy is simple, predominately galena, luminescent hydrothermal dolomite, sphalerite and chalcopyrite. Twenty-three additional minerals have been identified in the ores, including barite and Pb-aragonite, bot h of which have not previously been recognized in the district.

Paragenetically, the ores are very complex, with four major, distinct periods of mineralization plus numerous periods of dissolution. The paragenesis provides evidence for the dynamic, evolving nature of the ore system. Galena textures, euhedral …

Neutron Activation Analysis Of Nuclides From Stellar And Man-Induced Nuclear Reactions, Lawrence Lee Oliver

Doctoral Dissertations

"Neutron activation and γ-counting were used to determine the relative abundances of six stable tellurium isotopes in the acid-etched residues of the Allende meteorite. The results were correlated with the isotopic compositions of xenon and the elemental abundances of helium and neon in similarly prepared residues. Nucleosynthesis appears to be the only viable explanation for the anomalous isotopic and elemental compositions observed in these residues. Our results suggest that the solar system condensed from an isotopically and chemically zoned nebula that was produced by the explosion of a supernova, concentric with the present sun.

A combination of neutron activation and …

Desorption Of Copper From Illite Clay Using A Chelating Resin Encapsulated Between Porous Membranes, John Leonard Plude

Doctoral Dissertations

Toxicity studies have established the need for information concerning species distribution of heavy metals in the environment. In aquatic environments, the nature of trace metals, whether free, adsorbed, or complexed controls impact on biota. Often, major portions of the trace metals present in an aquatic system are immobilized on suspended particulates. Changes in environmental conditions such as pH, soluble ligand concentration and type, and concentration of suspended particulate material in the water column, can affect speciation of a metal. Filter feeding organisms are especially susceptable to these environmental changes. High bioconcentrations of trace metal species which are available to organisms …

The Construction Of A Logical-Empirical Structure Of Knowledge For Differential Calculus Using A Theoretical Framework Based Upon Learning Hierarchy Theory And Order Theory, James Martin Devecchi

Doctoral Dissertations

The principal result of this study is a logically and empirically valid Structure of Knowledge for Differential Calculus constructed using a methodology based on Learning Hierarchy Theory (LHT) and Order Theory (OT). A review of existing research into calculus learning is presented and properties of the strucutre of knowledge which address deficiencies in existing knowledge discussed. LHT is developed and techniques for the empirical validation and generation of hierarchies are discussed. Included in this discussion is a detailed analysis of the important properties of OT.

The generation of the structure of knowledge consisted of two phases: the logical analysis and …