Digital Commons Network^™

Phosphate Adsorption And Desorption On Two Contrasting Soils Used For Land Treatment Of Wastewater, Stephen Arthur Gasiorowski

Doctoral Dissertations

Land treatment of wastewater involves the use of plants and the soil to remove unwanted constituents. Removal of phosphorus is particularly important to avoid excessive biological activity in water systems receiving the treated wastewater. This research examines the phosphate adsorption - desorption behavior of two soils: Charlton silt loam, a typical acid soil from New England which is being used in experimental wastewater treatment, and Tujunga coarse sandy loam from a wastewater land treatment facility located at Manteca, California, which has failed to remove phosphate from wastewater efficiently.

The effects of changing the pH and phosphate content of municipal wastewater …

English Word-Making, Richard Henry Lederer

Doctoral Dissertations

English Word-Making presents the content and methods of modern research in morphology in the form of a textbook for secondary school English students.

The opening section offers a rationale for the uses of morphology at the secondary level. The emergence of English as a subject in the curriculum is traced historically; and the study of morphology is related specifically to humanistic goals and to the enhancing of skills in language analysis, speaking, reading, vocabulary growth, grammar and usage study, spelling, composition, and literary interpretation.

The main body of the text consists of ten chapters, each exploring, diachronically and synchronically, a …

Spatial Ability, Mathematics Achievement, And Spatial Training In Male And Female Calculus Students, Joan Ferrini Mundy

Doctoral Dissertations

The primary purpose of this study was to investigate the effects of spatial training upon calculus achievement, spatial visualization, and tendency and ability to visualize solids of revolution in calculus, for college males and females. A random sample of 250 first-semester calculus students at the University of New Hampshire was apportioned into seven experimental groups, each containing males and females. Students were pretested on precalculus background, spatial visualization, and calculus background, and were assigned to one of three treatment conditions: audiovisual spatial training (AV), audio-vidual-tactual spatial training (AVT), and a control condition. The spatial training materials were organized into six …

Normal Mode Spectra Of Sound Waves In Viscous Solid And Fluid Media With Particular Applications To Shallow Water Acoustics, Peter Geoffrey Harvey

Doctoral Dissertations

Sound propagation in shallow water is modelled using the Green's function formalism and normal mode techniques. The water layer is bounded above by a pressure-released condition and below by a halfspace of viscoelastic solid media. Nine different marine sediments are investigated by incorporating their published measured parameters into the bottom boundary condition utilizing the definition of specific acoustic impedance. A depth-dependent sound speed is treated in the ideal liquid layer.

In order to determine the most convenient mathematical representation for this shallow water model an investigation of the normal mode spectra of sound waves in viscous fluids and viscoelastic solids …

Interpretation Of Narrow Beam Sonar Echos Using A Variable Impedance Subbottom Model, Robert Leicester Bolus

Doctoral Dissertations

An underwater antenna consisting of an acoustic paraboloid reflector with a 12 kHz transducer mounted at its focus was designed and built for remote sensing of the subbottom {1}. Surveys taken with the 3 degree half-power beamwidth projector operating in a 1/2 ms pulsed mode indicated horizontal and vertical resolutions of less than 1 m with penetration into the sediments of up to 20 m at 20 m of depth. The image detail was substantially increased over that taken with a conventional 30 degree profiler.

The data was interpreted using a physical model of the subbottom consisting of plane parallel …

Angular Differential Cross Sections For Excitation Of Atomic Hydrogen To Its N=2 Level By Impact Of 15-100 Kev He⁺ Ions, John Eldon Aldag

Doctoral Dissertations

Differential cross sections Ear excitation of atomic hydrogen to its n = 2 level by 15-100 keV He⁺ ions have been determined for cm. angles from Oto 8 m rad. The cross sections were obtained from an analysis of the angular distribution of the scattered ions which had lost an energy corresponding to the excitation of the target to its n= 2 level. The shape of the differential cross section changes rapidly with increasing incident energy. At 15 keV, the cross section falls off by a factor of 5 in 6 m rad. At 100 keV, the cross section …

An Alternate High Pressure Injection System For Pressurized-Water Reactors, Gary Edward Mueller

Doctoral Dissertations

"To evaluate the In-Core Injection System (ICIS) performance during a loss-of-coolant accident (LOCA) due to a major rupture in the primary system of a pressurized water reactor (PWR), tests were conducted using the thermal-hydraulic computer code RELAP4/MOD5.

The results for the overall plant system show that the maximum core average fuel cladding temperature reached during an intermediate size cold-leg break in a Combustion Engineering PWR with ICIS is equal to the initial operating temperature of 335°c (636°F). The maximum core average fuel cladding temperature reached during a large size cold-leg break with ICIS is 478°c (893°F). This temperature is approximately …

Algorithms For Fixed Points Of Nonexpansive Operators, Michael Donald Humphries

Doctoral Dissertations

"Browder proved that in a Hilbert space or a uniformly convex Banach space every non-expansive self-map of a closed, bounded, and convex set has a fixed point. This dissertation contains two algorithms for finding a fixed point of such an operator. The first is a special case of the Mann process. It averages two points which are relatively distant to obtain a better approximation to a fixed point. Under Browder's hypotheses, there is a fixed point which is the limit of a sequence of fixed points of contractions. The second algorithm uses Richardson extrapolation to accelerate the convergence of this …

Solutions Of Differential Inequalities And Existence Theorems For Multi-Point Boundry Value Problems, Paul W. Eloe

Doctoral Dissertations

"Consider the boundary value problem y = 0, y(a) = 0, y(b) = O. The Green's function G(x,s) for this problem is negative for all (x,s) in (a,b) x (a,b). More generally, define the operator L by (formula presented).

If L is disconjugate on [a,b], then the Green's function for the problem

Ly = 0,

y⁽ⁱ⁾ (x.) = O, j=1, ..., k and i=0, ..., n^j-1

where rn_j = n and a= x₁ < x₂ < ... < x_k = b, satisfies the inequality (formula presented)

This implies G(x,s) satisfies the condition, called Condition S, that its sign is independent …

A Molecular Dynamics Study Of The Stability Of Small Prenucleation Water Clusters, Tze-Shan Chen

Doctoral Dissertations

"The dynamical stability and internal energy distribution of prenucleation water embryos have been studied by the molecular dynamic's method. Water clusters containing either five or twenty molecules were chosen to represent prenucleation embryos of small or intermediate size. A central force potential model of water which allows energy to be absorbed into intramolecular modes so that bond lengths and bond angles could adjust to changes in molecular environments was employed to describe the interaction between all pairs of atoms. The motion of the molecules was followed for extended time periods (of the order of several picoseconds) at each of a …

The Effect Of Availability Improvement Of A Nuclear Power Plant On The Cost Of Generating Electricity, Seyyed Mohammad Reza Nejat

Doctoral Dissertations

"The objective of this investigation is to study the economic benefits in operating a nuclear power plant as a result of improving the availability of the secondary (steam) loop of the plant. A new method has been developed to obtain availability, frequency of failure, probability and frequency of operation, cycle time, and uptime for different capacity states of a parallel-series system having components with failure and repair rates distributed exponentially. The method has been applied to different subsystems, systems, and the secondary loop as a whole. The effect of having spare parts for several components, as measured by savings in …

Amorphous-Damage Depth Distributions And The Amorphization Of Silicon By Ion Bombardment, Joseph Sadowski

Doctoral Dissertations

"Depth distributions of the radiation damage in moderately to heavily ion bombarded silicon was obtained in the following manner: The electron spin resonance signal from an ion bombarded silicon target was measured. This ESR signal was proportional to the amount of amorphous silicon present in the target. A thin oxide of specified thickness was then grown on the surface of the target by anodic oxidation and subsequently stripped off in a HF etch. The depth of the stripped impression below the unoxidized surface was measured using a multibeam interferometer. The amorphous ESR signal was again measured, and the strip / …

Implementing Ab 3408 (Hart Bill) In The Petaluma High School District: A Case Study, Gerald J. Dadey

Doctoral Dissertations

The purpose of this study was to implement AB 3408 by establishing an organizational system which would insure the development of minimum competencies and performance indicators, and also establish necessary procedures for implementing these competencies.

In January 1976, the California Educational Accountability Bill (AB 3408) became law and required that prior to June 1978 minimum competencies in the areas of written expression, reading and computational skills be adopted by the local school Boards of Education. Weber's Bureaucratic Organizational Model was selected at the most appropriate organizational structure for implementing AB 3408 because it optimizes precision, speed, continuity, adequate involvement of …

Influence Of Individual Differences And Rule Training On Prismatically Induced Transfer Effects, Michael Edward Tirrell

Doctoral Dissertations

No abstract provided.

Analysis And Simulation Of Stepping Motor Systems Using A Phase Plane Approach, Raymond Gerard Gauthier

Doctoral Dissertations

Stepping motors have become an increasingly popular electromechanical interface device, due to their increased reliability and lower costs over the D.C. Servo motor. The inherent open loop mode of stepping motor operation results, under certain circumstances, in a failure mode in which the output of the stepper no longer follows the input commands. In the past, it has been difficult for the designer to define the failure modes and it has not been obvious how to avoid them.

It is the intent of this dissertation to present a mathematical model for a class of stepping motors, the permanent magnet stepping …

Regulation Of The Reproductive Rates Of Diaptomid Copepods, Carl J. Watras

Doctoral Dissertations

No abstract provided.

Chinese And Western Man: A Challenge To The Assumption Of An Inherent Nature To Human Beings, Joseph John Mirabito

Doctoral Dissertations

No abstract provided.

I. Extracellular Metabolites From Coprinus Macrorhizus Microsporus. Isolation And Characterization Of Hydroxylagopodin B. Ii. The Cell Wall Composition And Structure Of Coprinus Macrorhizus Microsporus, Carey Bernard Bottom

Doctoral Dissertations

“A purple pigment excreted into the culture medium of a mutant strain of the basidiomycete, Coprinus macrorhizus var. microsporus (ATCC 34960) has been isolated and characterized as hydroxylagopodin B based on ultraviolet, infrared, and mass spectral data. A wild-type strain of C. macrorhizus microsporus does not produce the purple pigment, however it does produce lagopodin B which is yellow in solution. Identification of lagopodin B was based on its melting point, the purple color of its alkaline solution, the mass spectrum, and mobility equivalence with a standard by thin-layer chromatography. The production of hydroxylagopodin B in the mutant strain is …

Negative Ion Charge Transfer Of The Reaction Of S⁻ And O⁻ With Atomic Hydrogen Producing H⁻ Ions From 1500 To 10 Kev, George F. Hagner

Doctoral Dissertations

"The charge transfer reactions of 0^-, S^- with atomic hydrogen were studied from 1.5 to 10 KeV, and the reaction Cl^- + O₂ + O₂^- + Cl was studied from 10 eV to 10 KeV. The reactions studied were normalized to the reaction H^- + H + H + H^-. The maximum measured cross sections were 4.6 x 10^-16 cm² for the reaction Cl^- + O₂ + O₂^- + Cl and 4.4 x 10^-15 cm² for the reaction 0^- + H …

Studies On The Parasites Of Smooth Flounder Liopsetta Putnami (Gill) In The Great Bay Estuary, New Hampshire, Peter R. Burn

Doctoral Dissertations

No abstract provided.

An Investigation Of The Interactions Of Student Ability Profiles And Instruction In Heuristic Strategies With Problem Solving Performance And Problem Sorting Schemes, Martha Louise Hunt

Doctoral Dissertations

No abstract provided.

Isolation And Characterization Of A Bacterial Agglutinin (Lectin) In Limulus Polyphemus Hemolymph, Kevin Joseph Gilbride

Doctoral Dissertations

No abstract provided.

A Systems Analysis Of A Real-Time Multiprocessor Minicomputer System, William Howard Lenharth

Doctoral Dissertations

No abstract provided.

Applications Of Algebra In College General Chemistry: A Curriculum Development, Enid Loretta Reeder Burrows

Doctoral Dissertations

No abstract provided.

Contractions With Infinite Defect Index, Kenneth Robert Wadland

Doctoral Dissertations

No abstract provided.

Shadworth Hodgson And The Psychology Of William James: Experience, Teleology And Realism, Richard Paul High

Doctoral Dissertations

No abstract provided.

Lateral Eye Movement As An Indicator Of Cognitive Ability And Style, William Joseph Owens

Doctoral Dissertations

No abstract provided.

Inferences On The Shape Parameter Of The Gamma Distribution And Cramer-Rao Lower Bounds From Censored Data, James Wyckoff

Doctoral Dissertations

"This dissertation is presented in publication form and consists of two articles. The first article considers inferential procedures on the shape parameter of a gamma distribution from censored sampling. Moments for the statistic T = log(x̅_r/x͠_r) are found and used to derive a two-moment chi-square approximation for T. This approximation is then used for testing, estimating, and setting confidence bounds on the shape parameter of a gamma distribution. The second article concerns the Cramér-Rao lower bounds for the variances of estimators, where the estimators are based on censored data. Convenient techniques are derived to evaluate the …

Locally Quasi-Uniform Structures And Strongly Complete Quasi-Uniform Structures, Shirley Carpenter Huffman

Doctoral Dissertations

"Locally quasi-uniform spaces are studied, and it is shown that a topological space (X,t} admits exactly one compatible locally quasi-uniform structure if and only if tis finite.

A general topological result is given showing that a topological space with an infinite topology has either an infinite ascending or an infinite descending sequence of open sets.

The concept of aw-space is introduced, and it is ii shown that every w-space admits a strongly complete quasi-uniform structure. Also, a characterization of w-spaces is given showing when the fine quasi-uniform structure is equal to the fine locally quasi-uniform structure.

An example is given …

Some Results On Inferences For The Gamma And Double Exponential Distributions, John Victor Grice

Doctoral Dissertations

"This dissertation is presented in publication form and consists of two articles. The first article considers testing the mean of a gamma distribution. For the case that both parameters in the ganuna distribution are unknown, approximate tests for the mean are derived and tables are provided for their implementation. The power of the tests are compared to the power of the uniformly most powerful tests on the mean when the shape parameter is known. In addition, some limiting results are derived. The second article compares conditional and unconditional methods of constructing confidence intervals for the location parameter in the two-parameter …