Engineering Commons^™

The Use Of Graphical Techniques In Construction Management, Varne M. Kimmick

Civil Engineering ETDs

The relation and practical uses of graphics in construction management is a study area in which little work, with the exception of the critical path method, has been done. As the subject was begun, it was discovered there was little specific written material on the graphs themselves; therefore, a considerable portion of the thesis was devoted to basic graphics in order to make the discussion relative to construction more meaningful. Chapters I through VII cover the subject of basic graphics. The basic graphics portion was considered essential to the study in order to allow practical use of the work by …

Structural Stability In Earthquake Engineering., Aybars GüRpinar

Civil Engineering ETDs

To pate, only special cases of dynamic stability have been solved. In this dissertation, an attempt is made to obtain practical solutions to the stability problem in earthquake engineering.

A column supporting a concentrated mass at the top is treated as a single-degree-of-freedom system. The system is assumed to be linearly e·1astic with viscous damping. It is subjected to both horizontal and vertical random acceleration at the base, which are taken to be a band limited white noise simulating earthquake motions. The objective of this investigation is to find the probability of instability of the system.

Two methods of solution …

Hydraulics Of Waste Stabilization Ponds And Its Influence On Treatment Efficiency, Kenneth A. Mangelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The treatment efficiency of waste stabilization ponds depends on many factors, the most important of which are generally presumed to be the biological factors such as the type of waste and the organic loading. However, the biological activity in a pond is greatly influenced by the environmental conditions of temperature, wind, sunlight, and the hydraulic flow patterns. In the past little attention has been given to the hydraulic characteristics of waste stabilization ponds. Specifically, little consideration has been given to the gross flow patterns within stabilization ponds as affected by the shape of the pond or lagoon, the presence of …

Phosphorus Distribution In The Bottom Sediments Of Hyrum Reservoir, Kirk L. Schmalz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The distribution of phosphorus in the sediment of Hyrum Reservoir was studied by collecting and analyzing 84 sediment samples for total, inorganic, organic, and water-soluble phosphorus.

Sample locations were mapped by triangulation and sediment phosphorus distribution maps were made. Sediment analysis showed average total phosphorus content of 755 micrograms per gram, with organic phosphorus composing approximately 97 percent of total phosphorus.

Sediment samples showed variability in phosphorus content which precluded identification of point sources of phosphorus input to the reservoir. Several areas of comparatively higher phosphorus content in the sediments were shown with isopleth maps.

An estimate of the extent …

Computer Simulation Of Urban Runoff Characteristics Within Salt Lake County, Robert Newman Parnell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A hybrid computer program is developed to simulate the outflow hydrographs of two urban watersheds located within Salt Lake County, Utah. The gaged outflow of the watersheds provided a checkpoint for comparing the observed and the simulated final outflow hydrographs.

The outflow hydrographs for each subzone of the two watersheds were obtained by abstracting interception, infiltration and depression storage from each subzone hyetograph. The outflow of the subzones were routed to the Jordan River, the final outflow point of the two watersheds. The final hydrographs of the watersheds were combined and compared with the gaged flow.

The uniquenesses of this …

Measurement Of Soil Moisture By Attenuation Of A Vertically Polarized Radio Wave, Arlo D. Mickelsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this thesis is to determine feasibility and to investigate some of the problems encountered in making soil moisture measurements using radio wave propagation. The procedure consists of propagating a vertically polarized wave over the earth and measuring the field strength attenuation. A brief summary of present methods of measuring soil moisture is given.

Certain aspects of radio wave propagation theory are discussed, covering such topics as the surface wave, the space wave, the skin depth, and the effect of the dielectric constant on radio wave propagation. Based on this theory, measurement parameters such as frequency, antenna separation, …

A Correlation Study Of The Washington Pre-College Test Scores To Determine Which Scores Are The Best Predictors Of Success In Flight Aviation At The Big Bend Community College, Richard H. Pearce

All Master's Theses

The purpose of this study is to determine how a student's Washington Pre-College test results and his high school grade point average can best be used in deciding which people have the greatest chance to succeed in the Big Bend Community College flight aviation program. For the past four years of the aviation program it has been necessary to choose approximately seventy students for the program from as many as two hundred applicants. The counseling staff of the college in cooperation with the flight aviation department has used the high school grade point average as a primary tool in order …

Strain Measurements At Extremely High Temperatures Using Moiré Fringe Techniques., Joseph W. Neudecker Jr.

Mechanical Engineering ETDs

A new procedure is described for using the moiré-fringe technique to measure strains in structural materials at temperatures exceeding 1300 °C. The principal factor found to be necessary for successful viewing of moiré patterns at extremely high temperatures is the use of reflected laser light for viewing the strained grid on the material. This factor is extensively discussed and experiments are described in which strain measurements were successfully made on graphite specimens at elevated temperatures. It is concluded that the techniques described constitute a more feasible method of measuring strains at higher temperatures than is possible by any other known …

A Study In The Design And Development Of A Baseball Pitching Machine, Neal M. Lundwall

Theses and Dissertations

Throughout history man has had the need of services which require great skill or tremendous strength or delicate consistency on the part of those who perform. Much of the time he has turned to the machine to accomplish these requirements.

Transition From Laminar To Turbulent Flow For A Two-Phase Mixture, Mohammed Sharief Qureshi

Theses and Dissertations

A phase is simply one of the states of matter. Multiphase flow is the simultaneous flow of several phases. Two-phase flow is the simplest case of multiphase flow.

Hydrologic Inventory Of The Great Salt Lake Desert Area, Gary L. Foote

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Utah, located in the arid southwest, is a state that experience s chronic water shortages. The pattern of valleys and high mountain ranges that exists in the state produces sharply contrasting differences in climatic conditions . Desert valleys in the western portion may receive as few a s 4 inches of precipitation in a year while headwater areas in the Wasatch Mountains receive 60 inches or more. Wide cyclic as well a s geographical variations of precipitation added to uneven seasonal distribution makes development and efficient utilization of water resource s vital though difficult.

In order to make the most …

A Comparison Of Technologist Needs And Training Requirements Of The Major Industries Within The State Of Utah, Gene E. Forsberg

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The technologist needs and training requirements were determined from a selected cross-section of Utah industrial firms.

The larger industries were significantly more aware of the training requirements and capabilities of four-year technologists than were the smaller firms.

A significant difference was found regarding general and specialized training required by each firm. Thirteen of the 16 responding firms indicated specialized training as being most important.

The 10 areas of technical training rated most critical in their order of importance were: electronics, technical writing, electricity, English, mathematics (calculus and above), machine shop, manufacturing processes, physics, and metallurgy and design.

There was no …

A Computer Simulation Of A Partial Venous System Of A Human Lower Extremity, David C. Smith

Theses and Dissertations

The human body is truly a fascinating and complex creation of our Maker. Because of the complexity and variability, many of its workings were little known until recent years. Some of the more amazing facts of the circulatory system follow. If the individual blood vessels of a single adult, i.e., artery, arteriole capillary, venule and vein, were laid end to end, they would extend more than 60,000 miles. For the average adult, the heart beats 70 times per minute; for the well-conditioned athlete, 50-60 beats per minute; and for the extraordinary athlete, as few as 37 times per minute. The …

Transient Convective Heat Transfer Coefficient For Injection Into Rigid Vessel, James Edward Steiger

Theses and Dissertations

The purpose of this study was to develop and demonstrate a method for experimentally determining the convective heat transfer in a rigid vessel while air was being injected. The heat transfer took place between the air in the pressurized vessel and the surrounding walls which were maintained at a temperature of 32 F. with a circulating ice water bath. The study considers the effects of injection geometry and injection flow rate on the heat transfer process. The problem of heat transfer after injection has been considered by Means (1), and was responsible for establishing this study. The experimental technique used …

Conduction Error In Thermocouples Embedded In Low Conductivity Material, Tumkur G. Nagaraju

Theses and Dissertations

Thermocouples are generally used as devices to determine the internal temperature of any material. The purpose of the temperature measuring device is to measure the temperature which would exist at some known location if the device were not present. The thermocouples are embedded in the material in order to study the temperature-time history of the point of location. The presence of the thermocouple induces error in the temperature measured. This error becomes significant if heat is conducted into or away from the point of measurement by the sensor itself, or if the sensor insulates the point. This would result from …

A Statistical Theory Of Avalanche Breakdown In Silicon, Terence Vincent Sewards

Electrical and Computer Engineering ETDs

A statistical theory of avalanche breakdown in silicon is presented, based on the conventional Boltzmann transport equation. The scattering mechanisms considered are impact ionization (electron-hole pair production), phonon emission and absorption, thermal generation and recombination. The resultant critical field is found to depend on the recombination statistics, which were ignored in previous theories of avalanche breakdown. The theoretical temperature dependence is compared with the temperature dependence of the breakdown voltages of three conunercial diodes.

A Theoretical And Experimental Study Of An Unsteady Pressure Measuring System, Ramesh R. Batki

Mechanical & Aerospace Engineering Theses & Dissertations

Experiments were performed to determine the frequency response of gas filled instrument tubes, and the results were correlated with a theoretical model. The theoretical model developed by Bergh and Tijdeman for a series connection of thin circular tubes and volumes was studied in full detail and employed. A measuring system was designed and built to measure pressure ratio and phase lag employing thin nylon or vinyl tubes and strain gage transducers. 1'leasurements were performed using cathode ray tube, strip chart, analog techniques and also a commercial electronic function analyzer and the various results were compared. The theoretical and experimental influence …

An Experimental Investigation Of The Vortex Sink Rate Sensors, Nelson L. Lu

Mechanical & Aerospace Engineering Theses & Dissertations

The vortex sink rate sensor device consists basically of an ideal sink flow between two coaxial disks. A sink tube was located at the center of one disk. The vortex was created by the rotation of the unit about its axis of symmetry. Five inch and 10 inch diameter of porous couplers were used for the air chamber here in this investigation. Several slenderness parameters, i.e., the ratio of the sink tube diameter to the height of the air chamber ^ro/n were conducted. Two probes were used to measure the static pressure and stagnation pressure respectively at various positions …

Transverse Vibration Of A Class Of Orthotropic Plates, Nicholas J. De Capua

Dissertations

This study determines the eigenvalues, eigenvectors, and nodal patterns of a class of orthotropic plates whose geometry is governed by the equation

(x/a)^α + (y/b)^β = 1,

where the parameters a, b, a, and a permit the plate geometry to vary over a range which includes the rhombus, circle, ellipse, square, and rectangle.

Variable thickness, inplane forces, and mixed or discontinuous boundary conditions are also considered. The following assumptions have been employed:

i). plate is thin with respect to other dimensions,

ii). deflections are small,

iii). rotary inertia and shear are neglected.

The method of analysis employed is …

A Theoretical And Experimental Study Of The Mechanism Of Axoplasmic Convection In Nerve Fibers Driven By Peristaltic Surface Waves, Robert John Biondi

Dissertations

In the study of cell biology, investigators have found that substances which are produced within the cell nucleus are sometimes found throughout the cell at points distant from the site of production. In the case of nerve cells (neurons), this is particularly dramatic because of the unusual elongated geometry of these cells.

A neuron possesses a cylindrical tubular extension called an "axon" or "axis cylinder" which is characterized by a large length-to-diameter ratio (10³-10⁶). The existence of a continuous proximo-distal flow of axoplasm within these cylindrical axons has now been demonstrated by numerous investigators. In …

The Development And Use Of Scattering Parameters For Semiconductor Junction Devices, Lee Dennis Philipp

Electrical and Computer Engineering ETDs

Scattering parameters are developed for diodes and tran­sistors. The parameters are developed through a modification of the wave equation from quantum mechanics. The effects of pulsed X-ray radiation on these devices is then calculated with the use of these parameters.

Various methods of analyzing semiconductor junction de­vices are discussed. These methods include diffusion theory, invariant imbedding and quantum mechanics. The background in these areas necessary for a discussion of semiconductor models is outlined.

Models resulting from the three basic approaches are presented. These include the Ebers-Moll Model, the Charge Control Model, the Linville Model, the Gore Model, the MLB (McKelvey, …

Static And Dynamic Buckling Of Shallow Arches, David D. Loendorf

Civil & Environmental Engineering Theses & Dissertations

The static and dynamic buckling behaviors of a shallow, simply supported sinusoidal arch subjected to both a uniformly distributed step pressure load and a purely impulsive load are considered. Five equilibrium paths are obtained for the arch under static loading conditions. Critical static loads corresponding to two different instability modes and based on characteristics in the load displacement curve are obtained numerically. Critical dynamic loads, corresponding to three different instability modes, are obtained from a numerical procedure in which buckling criteria are based on characteristics in the time response of the structure. The influence of damping on the various dynamic …

Computer Simulation Of Unsteady Flow In An Alluvial Channel By The Method Of Characteristics, Dennis Lynn Richards

Electronic Theses and Dissertations

A number of dams have been constructed along alluvial rivers. These dams create reservoirs which serve to collect and store water, usually in large quantity, for use in supplying municipal needs, for supplying power and driving machinery, for furnishing irrigation, and for retaining the flow in time of floods. The characteristics of flow and the sediment-transport capacity of the channel change after these dams have been constructed. One of the major problems then confronting the hydraulic engineer is the rate of reservoir sedimentation and the change in river configuration. A problem of concern is the rapidity of reservoir sedimentation and …

Laminar Heat Transfer For Small Prandtl Number Fluids Including Step Change In Wall Temperature, Shiny Ting

Masters Theses

"The object of this investigation is to provide a simple means of determining the heat transfer from a flat plate which has an unheated leading length x₀. The case of steady, two-dimensional, laminar flow of an incompressible fluid with a Prandtl number of less than one is considered. Since there exists an unheated length and the Prandtl number of the fluid is less than one, the thermal boundary layer intersects the flow boundary layer. Thus, the solution of the problem divides into two regions. In this study, the problem is solved analytically by employing the energy integral equation. The temperature …

History Of Utah's Salt Industry 1847-1970, John L. Clark

Theses and Dissertations

Utah salt makers have extracted salt from three sources, the principal of these being brine from Great Salt Lake. Other sources are saline beds in Great Salt Lake Desert and subterranean halite formations in central Utah.

This study traces the development of methods used to recover and refine salt by the industry, in general, and by specific companies. It provides brief, historical sketches of the major corporations and the economic, legal, and environmental factors affecting their growth.

Utah produces about 1 per cent of the nation's salt, exporting over half of it from the state. The major factors limiting the …

A Measurement Of Complex Viscosity With Large Amplitudes, Kuo-Shein Shen

Doctoral Dissertations

"In order to study the viscoelastic properties of polymer solutions and greases, a dynamic apparatus was built for making measurements of complex viscosity. Characteristic impedance was measured by a force transducer, an accelerometer and a phase meter. Large amplitudes to 0.5 inch can be obtained with this apparatus. The largest amplitude used was 1.27 x10⁻¹ cm. The frequency range was 30 Hz - 1500Hz. The lowest dynamic viscosity to be measured was 0.5 poise. In order to determine the capabilities of the instrument, complex viscosities of polymer solutions and greases were measured. The polymer solutions studied were polyisobutylene (PIB) L-80, …

On-Line Economic Optimization Of A Chemical Reactor, Jesse Daniel Bennett

Doctoral Dissertations

"An economic optimizing control system for a continuous flow stirred tank chemical reactor is designed, simulated, and installed on a pilot scale reactor. The control scheme utilizes a reaction and reactor model to predict on-line the economic optimum of a reactant concentration. In this manner the control system manipulates the reactant flow rate to maintain the optimum concentration during changes in reaction-reactor parameters with time. Typical parameter changes include the decay of reaction catalyst activity. The optimizing controller will function in conjunction with various operating policies including control to maintain a specified production rate"--Abstract, page ii.

Experimental Investigation Of Shock Boundary Layer Interaction For Two-Dimensional And Axisymmetric Flow, A. Shawki Zahran

Electronic Theses and Dissertations

A supersonic wind-tunnel has been constructed using an 8 inch by 10 inch single stage jet vacuum ejector with a capacity of handling 0.4 lb/sec air at 4 inches Hg absolute suction pressure. A Toepler Schlieren system with 10-inch diameter parabolic mirrors has been set up for flow pattern visualization. The same apparatus was developed to obtain multi-colored views of the flow pattern. That was accomplished by placing an equilateral prism in front of the light source located at the focal plane of the first parabolic mirror. A spectrum was thus produced at the focal plane of the second parabolic …

Screening Electrocardiograms Using Hotelling's Method Of Principle Components, Edward G. Schwartz

Electronic Theses and Dissertations

Considerable use is presently being made of computers to classify electrocardiograms (ECGs) into various heart defect categories. An example of such a program is the "Electrocardiographic Analysis Program" developed jointly by the Mayo Clinic and IBM. In one of Dr. Caceres published reports, he tells of using a computer program which involves 5,000 instructions. Dr. Caceres does not say whether this is a commercial program or one of bis own. His description does place this program in the same general category as IBM's. These programs have the common criteria of examining the ECG for the same information that a cardiologist …

An Evaluation Of An Aerated Lagoon System Treating Combined Dairy And Domestic Wastes During Summer Operation, Douglas M. Skie

Electronic Theses and Dissertations

The Water Quality Act of 1965 and the adoption of the subsequent state water quality standards emphasized the general public's concern for the control of water pollution; for it has become the goal of our nation to maintain all American waters in a suitable condition for domestic and industrial supply, for recreation and for other beneficial uses. It is for these reasons that many communities have been faced with the problem of constructing new sewage treatment facilities or expanding present operations. The use of stabilization ponds as a means of providing sewage treatment has been the practice of many small …