Digital Commons Network^™

Analysis Of Flat Plates By Reaction Distribution Method, David D. W. Yang

Masters Theses

"This study was made to analyze rectangular flat plates by the method of Reaction Distribution and to compare results obtained by this method with that of other methods. The basic approach is to divide the plate into an equivalent grid system and introduce temporary supports at the intersecting joints. The results from this study shows that the Reaction Distribution method is useful in a qualitative analysis of the behavior in a plate but is less satisfactory in obtaining reliable quantitative results"--Abstract, page 2.

Predicted Transient Response Of Complex Poles By Means Of A Residue Ratio, Rameshchandra Shankerbhai Patel

Masters Theses

"Transient response plays an important role in servomechanism, electronic and electrical circuits. A time response of a linear system is the intuitive and immediately comprehensible description of the system performance. The utility of the system performance in television and high speed computer circuits can be determined by its transient characteristics. By locating certain points on the transient response curve the designer is enabled to predict the shape of the response with some precision. The choice of the overall transfer function (or location of the system singularities on the s-plane plot) is decided by speed, accuracy and stability of the response …

A Study Of The Permeability And Separation Of Carbon Dioxide And Hydrogen By Gaseous Diffusion Employing Barriers Of Polystyrene, Carl J. Wallace

Masters Theses

"The purpose of this investigation was to study the permeability and separation of carbon dioxide and hydrogen by gaseous diffusion employing barriers of polystyrene. The offset of temperature and barrier thickness on the permeability and separation of carbon dioxide and hydrogen wore Investigated for barriers of one, three, and five-mil thicknesses and for temperatures of 26, 35, 45, and 50 degrees centigrade.

With an increase in barrier thickness of one to five- mils, the permeability of carbon dioxide decreased to one-fourth of its value at the one-mil thickness. The hydrogen permeability decreased to approximately two- thirds of its value at …

Mechanics Of The Voussoir Arch As Applied To Block Caving, Christopher Haycocks

Masters Theses

"The theories of ground failure in massive rock with special reference to the problem of the mechanics of block caving were studied and evaluated.

The mechanics of arch or dome formation underground were studied quantitatively using the Voussoir arch theory. The effect of shear stress on the arch stability was considered and found to affect the system only when the arch height increased beyond certain limits.

A theory of the mechanism of ground failure in an undercut block using the dome theory was advanced. Photo- elastic model studies were used to support the conclusions reached"--Abstract, page i.

Shear Stress Distribution In Haunched Beam Models, Manyu K. Mehta

Masters Theses

"The purpose of this thesis has been to give the distribution of shear stress inside a haunch. A haunch is generally provided to relieve high stress concentrations at the face of the column. However the nature of shear stress distribution inside the haunch is not known.

This stress distribution was determined from a photo- elastic study on a CR-39 model. It is noted that the haunch reduces the stress concentration at the face of the column but at the same time somewhere near the point where the haunch meets the beam there is a high stress concentration.

Shear stress changes …

A Survey Of The Methods Of Gas Analysis, Yadvendra V. Desai

Masters Theses

"The object of this thesis is to survey the different types of gas analyses. Subject concentration will be centered on the general and specific instrumental methods of gas analysis. A general account of continuous automatic gas analyzers will be included. References are included for the use of those who desire a more comprehensive knowledge of a specific method of gas analysis.

During recent years, the importance of gas analysis has been considerably increased with the advancement of science and technology. Gas analysis mainly involves the identification, quantitative evaluation and separation of the components of a gaseous mixture. Thus it includes …

Analog Study Of Vibratory Forces In Sorting Machine, Navnit Chhaganlal Mehta

Masters Theses

"This investigation involves the study of the reduction of vibratory forces in a sorting machine. The equivalent masselastic system is shown in Figure 1, in solid lines. In this figure the mass m₁ represents the main structure for the mounting of the machine, the mass m₂ is the main bearing blocks and the mass m₃ is the vibrating basket. The elastic stiffness indicated as k₁ represents the mounting spring for the entire unit, the stiffness k₂ is that of the beam structure by which the bearing block is attached to the main structure, and the stiffness k₃ is that of …

A Study Of The Electro-Chemical Injection Of Ca(Oh)₂ Into Pure Kaolin Clay, Sam Michael Savas Jr.

Masters Theses

"The work presented in this thesis is the investigation and study of a possible and successful means of injecting an electrolyte solution into a fine grain soil mass with the use of electric current and to measure some of the changes of its physical properties. A NoKarb Georgia Kaolin Clay was treated by passing a preferential electrolyte solution of Ca(OH)₂ using direct current for a period of one and six days. The tests performed during this investigation included the following: (a) tri-axial tests, (b) atterberg limits, (c) pH determination, (d) moisture content change (from treatment), (e) visual settling of treated …

An Evaluation Of State Mineral Taxation In Missouri, Jerry Wayne Huffman

Masters Theses

"A study was made to evaluate the present taxes levied on the mineral industry in the State of Missouri. The corporate income tax, corporate franchise tax, and general property taxes were examined, in addition to the mine inspection fees and methods of local assessment of mineral properties.

It is suggested that the State of Missouri revise the method of application of the general property tax to mineral properties. Utilization of the principle of taxation of future profits and employment of qualified appraisers would provide a more equitable application of the general property tax.

It is recommended that the present mine …

A Tunnel Diode Parametric Down Converter, Leland Lovell Long

Masters Theses

"The problem, as presented, is to derive analytical expressions for the conversion gain, bandwidth, and noise figure of a self excited tunnel diode converter and to verify, if possible, the validity of these express- ions by building such a converter. These analytical results are presented and discussed. The converter circuit is shown along with the resulting intermediate frequency output. Gain and bandwidth measurements are also given. It is concluded that the self excited converter could very definitely be of value as a low noise pre-amplifying device in the ultra-high frequency and microwave frequency ranges"--Abstract, page ii.

A Study Of The Stress Distribution Around Circular Openings Using Multilayered Photoelastic Material, Donald Frank Haber

Masters Theses

"Stress analysis as applied to mine openings ranges from the completely empirical to the completely theoretical. However, it is only through the ultimate utilization of the two methods that a guide to the Interpretation of mine stress phenomenon may be obtained. The bridge between the two approaches lies in the field of model study. Specifically, this is an Investigation into determining the feasibility of using multilayered photoelastic materials in models such that a more exact approximation of the underground stress distribution around mine openings can be made.

The two major objectives in this study for determining the feasibility of using …

Porous Cooling Of A Pile, Tarsem Singh Purewal

Masters Theses

"In this investigation the problem of a limiting case of steady state one dimensional solid-fluid Newtonian heat transfer is examined in which an incompressible non-heat generating coolant fluid is flowing through a heat generating porous plate.

The effect of grain size on the Newtonian heat transfer in the porous plate with various kinds of internal heat generations is determined analytically. The temperature difference between the solid and the coolant fluid through the porous plate is determined. All the previous studies assume that in the porous plate, coolant fluid temperature and solid temperatures are approximately equal. This analysis eliminates this simplifying …

A Model Study Of The Behavior Of Elastic Liners In Shallow Underground Openings, Martin Samuel Oudenhoven

Masters Theses

"Models of epoxy resin were used in a stress freezing technique to determine areas of possible failure in lined circular openings. These models were loaded in a centrifuge for a fixed period of time, after which they were analyzed photoelastically. The material characteristic changes, with time, were recorded on graphs and used in the analysis.

Two types of tests were conducted; one, where the lining thickness was changed and, the other, where materials of the liner and plate material were changed.

The resulting analyses furnished proof that the greater the rigidity of the lining, the higher the stress developed in …

A Model Study Of The Induction Log Applied To The Detection Of Asymmetrically Located Orebodies, Robert Walter Piekarz

Masters Theses

"This research project was undertaken to determine the possibility of using an induction log of the type applied in petroleum exploration, for the detection of conductive ore- bodies asymmetrically located with respect to a borehole. Since a mathematical analysis would be extremely complex, a model study was conducted, using graphite bodies of various shapes to simulate different modes of mineral occurence.

The investigation showed that these bodies were readily detectable, and were capable of yielding anomalous curves characteristic of their geometry. The values of apparent conductivity decreased rapidly with lateral displacement, from the logging tool, as expected, due to the …

A Model Study Of The Application Of Roof Bolts Under Unsymmetrical Loading Conditions, Friedrich H. K. Esser

Masters Theses

"When coal is extracted by the long wall mining method, two gate-roads on either side of the working face are driven with the advancing operation. In the surroundings of these openings the state of stress which existed prior to mining is not only disturbed by the drifting process of the gate-roads but also by the coal extraction in the long wall, resulting in an "unsymmetrical" stress distribution. Varying incremental pressure components and the high complexity of strata movements make it extremely difficult to control the rock behavior under unsymmetrical conditions by conventional support. Application of roof bolts as an auxiliary …

Water Requirements For Waterfowl Areas Near The Great Salt Lake Parts V-Vi, J. E. Christainsen, Ming Chang Tsai, D. K. Kaushik, J. B. Law, J. W. Teeter

Reports

This report reviews activities on this project since the Progress Report, Part IV, June 1961.

The summer of 1961 has been one of the driest on record for Ogden Bay and Howard Slough Refuge. The extreme shortage of irrigation water has resulted in very little flow in the Howard Slough which originates from return flow. The available water from the Weber River for the Ogden Bay Refuge was also the lowest on record. The scarcity of water at these two refuges has resulted in increased salinity.

Most of the routine work on the project during the summer was done by …

A Study Of A Nonlinear Compensation Network In A Feedback Control System, John F. Taylor

Electrical and Computer Engineering ETDs

This paper is a study of the effect of a nonlinear compensation network on the closed-loop response of a feedback control system.

Physical energy dissipation elements, unlike their usual mathematical models, are often nonlinear. An example of such a nonlinear element is the mechanical damper. Since dissipation elements are used in most types of compensation, the problem of nonlinear compensation is an important one.

The study was performed with two goals in mind. The first was to determine the detrimental effects resulting from the insertion of the nonlinear network. The second was to see if any improvement in system performance …

4th Annual Rocky Mountain Spectroscopy Conference

Rocky Mountain Conference on Magnetic Resonance

Abstracts of papers presented at the 4th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 10-11, 1961.

Investigation Of The Platinum-Rich Portion Of The Platinum-Tantalum Phase Diagram, Bob Dean Browning

Theses and Dissertations

The Pt-Ta binary system was investigated at two isotherms;1000°C and 1500°C, and at eleven alloy compositions in the range of 50 to 100 atomic percent platinum. The alloys were examined by x-ray diffraction and metallography. Three intermetallic compounds, Pt₂Ta, Pt₃Ta, and Pt₄Ta were found to exist in this composition range. The Pt₄Ta intermetallic appeared only at the 1500°C isotherm. Platinum dissolved tantalum substitutionally to 90 atomic percent at 1500 °C and to approximately 80 atomic percent at 1000 °C.

Performance Of A Reinforced Concrete Pipe Culvert With Standard And B1 High Fill Bedding Under Rock Embankment, Ralph R. Taylor

Kentucky Transportation Center Research Report

In co-operation with the Bureau of Public Roads, a number of reinforced pipe culvert installations in a number of states have been selected to evaluate the effectiveness of the design and construction criteria. One particular pipe has been chosen for this special study because of its installation conditions. This pipe is located on I 75-6 (5) 123 in Scott County at Station 37 + 50, US460, SW Ramp, and has been constructed using both type beddings that are specified in the 1956 edition of the Kentucky Department of Highways Standard Specifications for Road and Bridge Construction and amendments thereto. Observation …

Fugacity Coefficients Of Gases In Binary Mixtures, Louis David Mazzeii

Theses

A method of Pitzer for predicting component fugacity coefficients of gases in binary mixtures is evaluated by calculating 2100 fugacity coefficients and comparing the results to experimental data.

Pitzer employed the technique of Gamson and Watson in deriving an expression for fugacity coefficients. The expression is based on a three parameter corresponding states theory set of equations, and a definition of pseudo critical properties of mixtures, both previously proposed by Pitzer.

A further comparison with values calculated by similar methods of Edmister and Ruby, and Redlich et al (which previously were established as the most accurate general methods) indicates Pitzer's …

Viscosity Correlations Of Saturated Fatty Acids And Their Esters, Thomas Joseph Redling

Theses

Several correlations have been developed which permit calculation of the viscosities of the n-paraffin fatty acids and esters, beginning with formic and including stearic acid.

The correlations were obtained by interrelating the Log u and the Log P_v at the same temperature, where u is the viscosity in centipoise and P_v is the vapor pressure in millimeters Hg. A single line relationship represents all the fatty acids from propionic acid to and including stearic acid, while formic acid and acetic acid each have their own line. Methyl, ethyl, propyl and butyl formate can be represented by a single …

The Kinetics Of Hydrogen Reduction Of Chromic Oxide, Kurt Strater

Theses

The hydrogen reduction of Cr₂O₃ to chromium metal was found to be feasible at very low water vapor concentrations, approximately -38° to -24°C, over a temperature range of 1130° to 1490°C. Hydrogen reduction under these conditions was predicted by the calculated equilibrium curves which also indicated that Cr₂O₃ is reduced directly to chromium without forming the intermediate oxide, CrO. This reduction path was confirmed by X-ray diffraction analysis.

The percent reduction of Cr₂O₃ at each reaction temperature was constant with time suggesting an inhibiting effect of the gaseous reaction product, water …

Attrition In A Fluidized Bed, Andrew Joseph Welter

Theses

The object of this thesis is to study attrition in a fluidized bed in an attempt to find a reliable method for predicting attrition rate when fluid flow rates and particle sizes are varied.

The system studied consisted of air as the fluidizing median with bauxite and fuller's earth as the solids in suspension. Fluid flow rates were changed while all other variables were held constant. Systems with both large and small particles were studied for each material.

It was found that the attrition rate of the material when the bed is maintained at a constant mass flow rate is …

Investigation Of The Stability And Response Of A Reboiler Under Condensate Control, Francis Arthur Winter

Theses

Control of heat flux by condensate throttling was investigated theoretically by frequency response analysis and experimentally on a simulated reboiler control system.

Transfer functions were derived for each component and ware used to describe the response of the experi- mental system. Experimental controller settings were in reasonable agreement with the calculated results. However, general overall control was poor because of dead time and cyclic disturbances. Experiments showed that the process contained dead time in the order of three to seven times the ultimate period (0.5 - 1.0 minutes). Several sources of disturbances prevented an accurate evaluation of stability at low …

The Effect Of Velocity On The Electrical Conductivity Of Blood, Judea Pearl

Theses

Although the change in the conductance of blood resulting from changes in its velocity has been noted by several investigators working with electrical impedance techniques, this parameter of measurement has heretofore not been investigated from the viewpoint of practical application to blood flow measurement.

In certain regions of the body such as the tooth pulp and the cranial cavity, the volume of the contained blood cannot fluctuate during a cardiac cycle because of the rigid wall of the chamber. Therefore, impedance pulses which have been obtained in studies on the tooth pulp, must be attributed to the rhythmical fluctuation of …

Test 799: John Deere 2010 Ru Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Test 798: John Deere 1010 C Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Comparison Of Pulse And Fm Radar Altimeters Based On Terrain Return Theory, David L. Quinlan

Electrical and Computer Engineering ETDs

In this paper a comparison of pulse of fm radar altimeters is made from the standpoint of the mathematical expressions describing each system’s return signal from terrain at near-vertical incidence. The pulse-fm radar relationships resulting from this comparison facilitates application of the extensive information gained in previous pulse radar studies to the investigation of fm radar terrain return and the associated design of fm radar altimeters, and may also assist in the development of the new pulse-type radars.

Numerical Analysis Of The Interaction Of An Oblique Shock Wave And A Laminar Boundary Layer, James K. Cole

Mechanical Engineering ETDs

When a shock wave impinges on a boundary layer the interaction involves the continuous, viscous behavior of a boundary layer with the almost discontinuous behavior of a shock wave. A boundary layer is the region of a moving fluid that is adjacent to a solid surface. The velocity of the fluid is zero at the surface. The viscosity of the fluid causes relatively large shearing stresses in boundary layers. A shock wave is a region of a fluid which has extremely large gradients of the particle velocity. Shock waves are often rep­resented by mathematical discontinuities. A shock wave is called …