Engineering Commons^™

Inplane And Out Of Plane Buckling Of Thick Rings Subjected To Hydrostatic Pressure, Thomas Michael Juliano

Dissertations

The problem of inplane and out of plane buckling of a thick circular ring subjected to a hydrostatic pressure is analyzed from first principals. The equations of equilibrium from nonlinear elasticity theory are used to describe two adjacent equilibrium positions, i.e., an initial and final state. The initial position problem is assumed to be governed by linear theory. The resulting incremental value equations obtained by subtracting the two equilibrium states, are also linear in nature. These problems are reduced to a one dimensional ring theory problem by the method of power series expansion of the displacements in the radial and …

Noise Performance Of The Klapper-Kratt Low Delay Fm Detector, Allan Brown Tarbell

Dissertations

In this dissertation the dual differentiator version of the Klapper-Kratt FM detector family is investigated with additive Gaussian noise. Prior analysis of this new detector family has been limited to the noiseless case.

The investigation was conducted both analytically and experimentally. First, the dual differentiator version of the Klapper-Kratt detector was mathematically analyzed, assuming an unmodulated carrier plus additive Gaussian noise. This analysis was verified by assembling the detector and measuring its performance in the laboratory.

It was discovered that the Klapper-Kratt detector without limiter performs identically to the conventional limiter discriminator in the linear improvement region. When compared to …

The Use Of Natural Sorbents For The Treatment Of Industrial Sludge Leachate, Mung Shium Jack Sheih

Dissertations

A sorbent treatment process has been developed which uses natural clay soils and fly ashes as sorbents in the treatment of the hazardous contaminants of potential sludge leachate emanating from industrial landfills. Natural sorbents (i.e., vermiculite, illite, kaolinite, zeolite, acidic and basic fly ashes) were evaluated for the removal of specific cations, anions, and organics from leachates generated from three industrial sludges (i.e., calcium fluoride, metal finishing, and petroleum). The laboratory results indicate that, rather than a single sorbent, a combination of acidic and basic sorbents in a layered system is required to reduce for the measurable contaminants present in …

Signal Processing Techniques For Analysis Of Heart Sounds And Electrocardiograms, Alan D. Bernstein

Dissertations

Audible heart sounds represent less than 5% of the vibrational energy associated with the cardiac cycle. In this study, experiments have been conducted to explore the feasibility of examining cardiac vibration by means of a single display encompassing the entire bandwidth of the oscillations and relating components at different frequencies. Zero-phase-shift digital filtering is shown to be required in producing such displays, which extend from a recognizable phonocardiogram at one frequency extreme to a recognizable apexcardiogram at the other. Certain features in mid-systole and early diastole, observed by means of this technique, appear not to have been previously described.

Frequency …

Synthesis Of Multiarea Grid Power Systems, Bharat C. Patel

Dissertations

This dissertation presents improved development in the formation of a generalized transmission loss (B)-matrix for a multiarea grid power system. In the procedure, the individual tie powers of each area are replaced by the net interchange, sneak and circulating powers. The latter two variables are directly eliminated in the power reference frame using actual impedances, unlike current methods that require the elimination of sneak and circulating currents, the formation of complex tie current model and the complex tie power model. Consequently, manipulation of large complex current, power and impedance matrices is avoided reducing both computer time and memory requirement. Further, …

A Three-Dimensional Kinematic Model Of The Human Knee, Wayne Ke-Wung Li

Theses

This thesis describes two kinematic models of human knee which may be used to study the motion of the knee and the forces in the ligaments of the knee. In one model, the ligaments are simulated by rigid links connected to links representing the articulating bones at the centroids of the areas of insertion of the ligaments. The condylar higher pair connections are simulated by equivalent linkages connected by resolutes. In an advanced model, the rigid ligament links are replaced by springs.

The IMP procedure, a powerful kinematic linkage analysis method, is employed to study the motion and forces in …

A Study On The Growth And Asparaginase Production Of Vibrio Succinogenes In A Chemostat, Preston David Krautheim

Theses

A continuous fermentation assembly was constructed and studies on the growth of the organism, Vibrio succinogenes, and its production of asparaginase was conducted. Results were compared with that already performed on a batch system and showed that a continuous fermentation produced 31.83 I.U. enzymes/mM ammonium formate compared to 17.4 I.U. enzyme/mM formate for batch.

Some of the runs performed indicated that the organism was washing out or giving very low specific growth rates. It was decided that this was not due to operational parameters of the chemostat, but possible chemical contamination in the medium. With all things considered, a continuous …

Axisymmetric Air Jet Impinging On A Convex Hemispherical Plate, David C. Chan

Theses

Experimental investigation was conducted on an axisymmetric, submerged air jet impinging normally on a smooth convex hemisphere. Three nozzle diameters of 0.5" (12.7mm), 0.375" (9.525mm) and 0.25" (6.35mm) were used and tests were run at Reynolds number range of 14,700 to 84,000.

The results obtained in the free jet and deflection zones were found to confirm the works of previous investigators. As for the fully developed wall jet region, the following points are noted:

1. The maximum wall-velocity decay was found to possess a slightly higher rate than that of either the flat plate or the concave hemisphere.

2. The mean velocity …

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An Equilibrium Theory Of The Ph-Parametric Pump, Charles Omotayo Kerobo

Theses

Parametric pumping, both batch and continuous, and cycling zone adsorption are theoretically scrutinized for various operating conditions by using the concept of equilibrium stages. The model system is Haemoglobin-Albumin-CM sepharose, a physical system in which a local equilibrium between liquid and sorbent in the layers of the separating medium in the column is characterized. For the batch process, the steady-state concentrations in both top and bottom reservoirs are found to be independent of the number of equilibrium stages, provided that a = 1 (i.e., number of transfer steps/number of stages).. For continuous parapump process, separation is enhanced with decreasing top …

A New Mathematical Model For Nephron Macromolecular Selectivity, John Anthony Domiter

Theses

A mathematical model describing the displayed selectivity of the kidney nephron to macromolecules of varying particle size is presented. Diffusion and electrical forces are considered to be the sole mechanisms of transfer. The mass transfer principles responsible for selectivity are considered to occur within the capillary structure, and not within the membrane wall. A charge is assumed to be characteristic of the macromolecule and the membrane wall. Models describing both charged and uncharged solutes are developed.

A non-linear least squares technique, developed by Marquardt, is used to curve fit the derived functions to data relating fractional clearances of dextran and …

Calculations Of Isobaric Phase Enthalpy Differences For Binary Systems From Vapor-Liquid Equilibrium Data, Steven Merrill Harvey

Theses

Equations relating isobaric vapor-liquid equilibrium data to heats of vaporization are useful in testing the thermodynamic consistency of experimental VLE data and in the design of distillation equipment. Several researchers have proposed such equations based on the Gibbs-Duhem equation. At low pressures, simplified versions of these equations were successfully used to test the consistency of published VLE and enthalpy data. At high pressures, equilibrium phase enthalpy differences were calculated from rigorous equations using a modified form of the Redlich-Kwong equation to calculate fugacity coefficients. As expected, the relative error of using the simplified equations was found to increase with increasing …

The Preparation, Spectra, And Conformations Of Cis, Cis-, Cis, Trans-, And Trans, Trans- Dipropenyl Ethers, Helen C. Hollein

Theses

Cis,cis-dipropenyl ether was prepared by potassium t-butoxide catalyzed rearrangement of diallyl ether in diglyme solution. Pyrolysis was used in an attempt to produce an isomeric dipropenyl ether mixture with a high percentage of the less stable trans,trans isomer; 21.6% trans,trans-dipropenyl ether was produced by pyrolysis at 395°C, but formation of an azeotropic byproduct in significant quantities negated the feasibility of this synthesis. A mixture of 45.7% cis,cis-, 43.6% cis,trans-, and 10.7% trans,trans-dipropenyl ether was produced by mercuric acetate catalyzed isomerization at 80°C, and the mixture was separated on a Nester/Faust spinning band column of two hundred theoretical plates.

Physical properties, …

A Feasibility Analysis Of A Directly Sun-Pumped Carbon Dioxide Laser In Space, Seiichi Morimoto

Dissertations and Theses

The possibility of using sunlight to pump a CW carbon dioxide laser has been analyzed. Such a laser could be of interest for such applications as space communication and power transmission. In order to optically pump CO₂ using sunlight, the intense vibrational-rotational absorption bands of CO₂ in the 4.3 micron spectral region would have to be utilized. The total pumping power from sunlight can be calculated from the known data of the solar spectral irradiance outside the atmosphere and the infrared absorption by carbon dioxide at 4.3 microns. The pumping power is proportional to the collector area of …

The Effects Of Artificial Destratification On Water Quality In Hyrum Reservoir, John W. Gill

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Hyrum Reservoir, Utah, was studied for one year during an artificial destratification project. Previously Drury et al. (1975) had studied Hyrum Reservoir for one year of stratified and one year of destratified conditions. The redistribution of dissolved oxygen to the hypolimnion significantly changed conditions for chemical and biological activities in the lower depths of the reservoir. The Aphanizomenon bloom increased with each year of destratification. The reservoir was changed by destratification so as to be suitable habitat for trout on a year round basis. Aerobic conditions prevented iron from being released from the sediment into the aqueous phase. In summary …

Evaluation Of A Welded Wire Retaining Wall, Jerold Albert Bishop

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this paper is to evaluate the performance of a Welded Wire Retaining Wall and present design recommendations for its future use. Field data from the instrumentation of a Welded Wire Retaining Wall as well as laboratory data from a study of welded wire fabric as a reinforcing agent for soil was gathered. A study of the theory and practice of reinforced soil construction was made. On the basis of this study and the experimental data obtained, the wall is evaluated and design recommendations presented.

Spectral Signature Studies For Application In Deer Census Using Remote Sensing Techniques, Maran C. Pate

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was performed to determine the spectral signatures of deer and their natural background elements for censusing purposes. Consideration was given to atmospheric transmittance, acceptable flying weather, and terrain. Possible spectral bands between 0.3 and 14.0 μm were obtained (over a pathlength of 1500 feet at an altitude of 5000 feet) based upon atmospheric transmittance using the LOWTRAN 3B computer program. They are: 0.30 - 1.33, 1.49 - 1.79, 2.00 - 2.50, 3.00 - 3.16, 3.38 - 4.10, 4.59 - 5.05, and 8.00 - 13.33 μm, for transmittance greater than 75%. Weather conditions are favorable for flying and taking …

Feature Selection And Classifier Design With Applications To Remote Sensing Of Mule Deer, Manmohan M. Trivedi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The feasibility of an airborne system to census deer populations using remote sensing techniques is evaluated in this research. The analysis is based upon the study of spectral signatures of deer and various background objects. The deer detection problem is modeled as a multispectral pattern recognition problem where the classification is performed in a multidimensional feature space. A generalized scene, of which the winter range may be considered typical is used in the classification. It includes the deer, evergreen trees, sagebrush, and dry brush against a snow background. The signature stability study led to the conclusion that the direction-angles of …

Development Of A Liquefaction Opportunity Map For Cache Valley, Utah, Richard J. Greenwood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A liquefaction opportunity map was developed for Cache Valley, Utah. The study was the initial phase to determine the potential for liquefaction in Cache Valley.

The method used in this study to develop the liquefaction opportunity map was based on a procedure developed by Youd and Perkins (1977).

This opportunity map is proposed to be combined with a map delineating liquefaction susceptible soils to produce a liquefaction potential map. The liquefaction susceptibility map is being developed in a companion study.

The liquefaction potential map will assist in the evaluation of earthquake response in general and microzonation in particular. The liquefaction …

A Liquefaction Potential Map For Cache Valley, Utah, Randall Jones Hill

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The identification of liquefaction susceptible soil deposits in Cache Valley, Utah and the relative potential that these deposits have for liquefaction were the two main purposes of this study. A liquefaction susceptibility map was developed to outline areas where liquefaction might occur during an earthquake. The susceptibility map was combined with a liquefaction opportunity map to produce a liquefaction potential map for Cache Valley, Utah. The opportunity map for Cache Valley was developed in a companion study, Greenwood (1978).

The development of the susceptibility map and the opportunity map and combining them to form a liquefaction potential map for Cache …

A Tv-Calculator Teaching Aid System, Robert A. Pezzano

Electrical and Computer Engineering ETDs

A system is described in which calculations performed on an electronic calculator are displayed as an algebraic expression on a television or video monitor. A video module generates the timing signal for the video monitor and allows 16 lines of 16 characters to be displayed. The calculator module provides interfacing between the keyboard and display of a TI-59 calculator and the system. A computer module, containing a Z-80 microprocessor, interprets the calculator signals, simulates the calculator logic, and provides the video module with the information to be displayed.

Development Of High-Pressure Liquid Chromatography Techniques For The Analysis Of Wastewater Effluent, Glenn Douglas Pierce

Civil Engineering ETDs

This investigation characterized a biological secondary wastewater effluent by conventional wastewater analysis parameters, evaluated the capabilities of activated carbon and macroreticular resin for recover­ing residual organics from the effluent, correlated conventional para­meters with carbon recoveries, developed high-pressure liquid chroma­tographic techniques for separation of organics in the recovered mixtures and identified a selected extract fraction. The Organics-Carbon Adsorbable Standard Method was adapted for use with a low turbidity effluent and a mass balance based on non-volatile total organic carbon was developed, demonstrating that the sorptive capacity of the system was not exceeded by a 60-1 sample. Ten individual carbon chloroform extracts …

Classical Modeling Of A Phosphate Molecule (Including 3-D Computer Graphics Display), Ronald A. Tafoya

Electrical and Computer Engineering ETDs

An investigation is made of the classical force terms necessary to model adequately the structure and interatomic forces of the phosphate molecule. The two principal considerations chosen for use in judging the performance of models were:

1. Agreement with empirical spectral data on normal mode vibrational frequencies

2. Agreement with other known physical characteristics of the phosphate molecule

The performance of all models was good. Agreement with normal mode frequencies and phosphorus-oxygen bond lengths ranged from an RMS error of 5.4% in Model one to an RMS error of 1.5% in Model Five. An examination was made of six different …

Deep Penetration Of Electrons Into Homogeneous Media By The Method Of Condensed Collisions, Joseph Francis Janni

Chemical and Biological Engineering ETDs

The objective of this dissertation was to develop an accurate and efficient alternative to presently available methods of calculating the steady state penetration of electrons deep into homogeneous materials. A thorough solution must include scalar fluxes, net currents, angular distributions, and differential energy spectra. This research has successfully developed the method of condensed collisions, which provides an alternative to methods now in use for the solution of the electron transport problem. The condensed collsion method is general, but has been applied specifically to deep penetration electron transport to demonstrate its utility. The present aplication was for electrons having incident energies …

A Numerical Investigation Of Nonlinear Resistance In Second-Order Autonomous Dynamic Networks, John Jerome Bornholdt

Electrical and Computer Engineering ETDs

Most approaches to the analysis of autonomous nonlinear networks fall under one or more of three categories: topological techniques, stability analysis, and approximate methods. The first method is universal, linear or nonlinear. The application of computer techniques has given strong emphasis to the latter. Approximate methods can give results on estimations of how net­work components affect stability.

This paper is an investigation of the stability of nonlinear resistance in autonomous dynamic networks through approximate methods.

A system that is both unforced and time-invariant is called autonomous. Linear autonomous networks lend themselves to general analytic solutions. With nonlinear autonomous networks, however, …

The Effect Of Earth Media On Seismic Motion And Structure Response, Joseph John Fedock

Civil Engineering ETDs

An analysis is performed to determine the influence of the choice of a constitutive model for the earth medium upon the response of a rigid structure to seismic waves. A finite element method is employed to analyze the motions of an embedded structure in which the surrounding earth medium is represented by three different constitutive models. Linear elastic, linear viscoelastic, and elastic-plastic models of soil behavior are utilized in one- and two-dimensional analyses. The seismic disturbance is characterized by a pressure wave for the one-dimensional case while a system of horizontally propagating Rayleigh waves is used in the two-dimensional analysis. …

Mass Transfer At The Edge Of A Rotating Disk, Jeffrey Malcolm Cohen

Chemical and Biological Engineering ETDs

A different approach to the problem of mass transfer to a rotating disk, employing less restrictive assumptions, has been undertaken to quantify the phenomenon of mass transfer at the disk's edge. Experimental work in support of theor­etical conjectures was performed as part of this work.

In order to include the effect of mass transfer at the edge on mass transfer to the entire disk, the equation of convective diffusion was solved in two dimensions over a region that extended beyond physical projection of active area of the disk. A synthesis of experimental results and theoret­ical considerations was used to specify …

Radio Frequency Sputtering Deposition And Characterization Of Thin Ferroelectric Titanate Film On Silicon Substrates, Cheng-Cheng Hu

Electrical and Computer Engineering ETDs

This work was done to achieve two goals: (1) To investigate and document the optimum deposition conditions for thin ferroelectric BaTi03 film on doped silicon substrates by r.f. sputtering; (2) to characterize the electrical properties of the metal-insulator-semiconductor (MIS) structure with BaTi03 as insulator and the memory characteristics involved.

Coupling Efficiency And Alignment Sensitivity Of Single Mode Optical Fibers, James Mathew Martin

Retrospective Theses and Dissertations

Coupling efficiency an alignment sensitivity models for the coupling of light from a fundamental mode Gaussian light beam into a single mode optical fiber are given. Experimental results are presented which verify the coupling and misalignment predictions of the models. Data were taken at two wavelengths: 0.6328 and 0.8460 micrometers. The light sources were a HeNe laser and a GaAlAs laser respectively. Coupling efficiencies were measured versus beam spot size; and lateral, axial and angular misalignments of the beam and fiber axes.

Optimization Of Stormwater Management Practices And Processes, Mark Michael Calabrese

Retrospective Theses and Dissertations

In recent years, stormwater has been found to be a major source of pollution to receiving waters. Major research efforts have been directed in this area, primarily as a result of the Federal Water Pollution Control Act and Public law 92-500, the 1972 Amendments to the act. Yet, a need remains for more data in the field of stormwater management. Such needs include cost-performance data and planning methodologies to optimally select best management practices (BMP's). The research culminating in this report addresses these needs. A computer program, "MANAGE", has been written to generate cost/efficiency curves, and uses these curves to …

Critical Exposure Pathways: An Analysis Of The Environmental Impact Of Gaseous Effluents From Light-Water-Cooled Reactors, Robert Danna

Retrospective Theses and Dissertations

The analysis of the environmental impact of routine radioactive gaseous releases from operating nuclear power stations is discussed using a radiation dose assessment. This analysis includes a discussion of the origin of radionuclide effluents, a discussion of federal policies, and a calculation of radiation doses to man. A model of estimating the radioactive dose from gaseous effluents from light-water-cooled reactors is described using guidelines described in the Code of Federal Regulations and the Nuclear Regulatory Commission's Regulatory Guides. The environmental impact of these sources is then analyzed using dose rates calculated along critical exposure pathways for various radioactive nuclides. Examples …