Engineering Commons^™

An Experimental Study Of The Production Of Metallic Impregnations And Coatings -- A Vacuum Process, Engle D. Southard

Chemical and Biological Engineering ETDs

The purpose of this study undertaken was threefold, (1) to design and construct an experimental vacuum apparatus to produce a metal impregnated or coated material; (2) to study some of the variables which affect the process; then (3) to examine the physical characteristics of the resultant materials. Described herein is the development and operation of a vacuum system capable of producing conditions to permit the evaporation of metals to impregnate and coat various materials. The fundamental principle involved in this process is that a rarified atmosphere reduces the temperature required for metal evaporation and protects the metal vapor from reacting …

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.

The Effects Of Operating Variables On The Adsorption Of Water From Iso-Propyl Alcohol Using Molecular Sieves, Warren P. Johnson

Chemical and Biological Engineering ETDs

The purpose of this paper is to present a study made on the effects of (1) feed concentration, (2) liquid flow rate, (3) column dimensions and (4) absorbent particle size on the selective absorption of water from iso-propyl alcohol with molecular sieves in a semi-continuous or fixed-bed operation.

A Flotation Process For The Concentration Of New Mexico Oolitic Iron Oxide Ores., William C. Rahmig

Chemical and Biological Engineering ETDs

The vast expansion in the production of steel in the twentieth century has turned the eyes of the steel industry toward sources of low grade iron ore. Evidence of this is dramatically presented in a recent issue of Steel Facts. Fifty two percent of the iron ore mined in the United States was concentrated before shipment to the consumers. This is an increase of 25 percent over the amount concentrated a decade ago. The marked increase will continue as technological advances light the way for economical are treatment.

Thermodynamic Properties Of Formaldehyde, Raymond H. Koo

Theses

The thermodynamic properties of saturated and superheated formaldehyde were evaluated at ten degree temperature intervals from -19°C. to 400°C. and at various pressures up to 150 atmospheres.

Lydersen's correlations were used to estimate the critical constants.

Vapor pressure data were calculated using Riedel's method.

The generalized thermodynamic correlations of Hougen, Lydersen,'and Greenkorn were employed to obtain values of the thermodynamic properties in the saturated and superheated regions.

The values for temperature, pressure, specific volume, enthalpy, and entropy for saturated and super-heated formaldehyde are presented in the form of tables and graphs.

Effect Of Cleaning Methods Upon Electrochemical Behavior Of High-Carbon Steel Cathodes In A Chromic Acid Electrolyte, George Chaplenko

Theses

The quality of electrodeposited coatings is to a great ex- tent determined by cleaning or surface-conditioning methods employed in preparing the basis metal for plating. Cleaning pro- cedures are usually established empirically, by trial and error. Little or no experimental work was devoted to a quantitative stu- dy of measurable parameters that are influenced by the relative effectiveness of individual cleaning processes. The present ex- periment was designed in an attempt to establish a correlation between one such parameter (namely, the single-electrode poten- tial of polarized cathode) and the quality of subsequent plating.

High-carbon steel cathodes, -a material that is …

Induction Heater Temperature Controller, Raymond A. Gore

Electrical and Computer Engineering ETDs

The author was presented with a system to control the power output of a radio frequency oscillator used for induction heating. The original system was unstable. It was stabilized but even then its performance was not satisfactory. Thus the problem was to design a satisfactory system using some of the components of the old system.

Conditional Effects In The Transistor Distributed Amplifier, Herbert D. Arlowe

Electrical and Computer Engineering ETDs

No abstract provided.

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 …

A Method Of Measuring Temperature Changes Casued By Strong Shock Phenomena, Benjamin J. Goodier

Electrical and Computer Engineering ETDs

This thesis is concerned with the development of a method to measure the temperature of a metal surface during a time interval of a few microseconds while it is being subjected to a strong shock. The temperature of a special interest is the temperature of the free surface which appears after a strong shock has been reflected from that surface. This temperature remains constant until another shock wave is reflected from the surface, except for the change caused by heat loss to the surroundings by radiation.

Digital Computers And Their Application To Civil Engineering Problems, Richard G. Vaughan

Civil Engineering ETDs

Early in 1960 a study was undertaken by the author to become acquainted with the use and application of digital computers in the structural and civil engineering fields. After several months study and attendance, during the summer of 1960, at a National Science Foundation Institute on the use of digital computers in engineering, it was felt that the study could be expanded and presented in thesis form. The principal benefit from the study, other than the author's, will possibly be the integration into the civil engineering curricula of the material contained in the thesis.

The material as presented is the …

Adaptation Of Beggs Deformeter Apparatus To The Solution Of Three-Dimensional Problems, Roland L. Finley

Mechanical Engineering ETDs

In the area of structural analysis and structural design, numerous efforts have been made and more are yet to be made toward solving statically indeterminate problems easily and with a high degree of accuracy. Fortunately, the great majority of such problems can be solved by one or more of the many mathematical methods that are normally used. However, the mathematical solutions become exceedingly difficult if and when it is desired to use irregularly shaped structural members.

A Conversion Means Between The Crc-102a And Maniac I., Theodore E. Smart

Electrical and Computer Engineering ETDs

The University of New Mexico has acquired two general purpose computers; a CRC-102A and MANIAC I. The MANIAC I has been installed and is nearing operational status, while the CRC-102A has been in use for some time. When both computers are operating it will be desirable, in certain, cases, to program a problem for both. A means for translating a program for one of the machines into a program for the other with a minimum of manual effort would, therefore, be useful. The purpose of this project was to translate the commands for one computer into commands for the other …

The Use Of Ferrophosphorous And Manganese Ore In High Density Concrete For Radiation Shieding, Robert A. Crist Jr.

Civil Engineering ETDs

The scope of this thesis encompasses the investigation of the feasibilities of using a locally and/or readily available heavy aggregate for high density concrete. Such an aggregate was found to be available in Socorro, New Mexico. The Socorro Manganese Corporation has a stockpile of over 7,000 tons of high-grade manganese ore (specific gravity = 4.5) potentially suitable as a heavy aggregate, and some of which was used for this research. Along with the manganese ore was used ferrophosphorous, a very heavy aggregate manufacture by the Victor Chemical Works (specific gravity = 6.5), to obtain a range of densities that would …

Theory And Fabrication Of Point Contact Diodes Utilizing Reduced Single Crystal Rutile Tio2, Goebel Davis Jr.

Electrical and Computer Engineering ETDs

Single Crystal Rutile TiO2 upon reduction by heating in an atmosphere of hydrogen becomes a semiconductor, and the conductivity increases with the time and temperature of reduction. The reduction process creates oxygen vacancies with which there are associated two loosely bound electrons. These electrons may be raised to the conduction band by thermal excitation. Hence, an oxygen vacancy behaves like an impurity donor site.

The Use Of Compensation With Directional Couplers, Roland Alan Lincoln

Electrical and Computer Engineering ETDs

This thesis describes an improved technique for measuring voltage standing wave ratio (VSWR). The reflectometer system is analyzed, and an improved coaxial system is presented which more accurately measures VSWR.

The Control And Measurement Of Minute Curvatures In A Steel Shaft, Donald F. Wilkes

Mechanical Engineering ETDs

The primary purpose of this thesis was the solution of several special problems relating to the establishment, adjustment, and measurement of small elastic curvatures and the associated strains in a metal shaft. The solution of these problems was an important link in the development of a new type of seismometer for measuring extremely long periods with vibrations (up to 60 seconds). To achieve the sensitivity and long natural period of vibration required for accurate measurements of long-period waves, the seismometer employs a seismic mass which is suspended on an air film and constrained to follow an essentially horizontal guide rod. …

The Control And Measurement Of Minute Curvatures In A Steel Shaft, Donald F. Wilkes

Mechanical Engineering ETDs

The primary purpose of this thesis was the solution of several special problems relating to the establishment, adjustment, and measurement of small elastic curvatures and the associated strains in a metal shaft. The solution of these problems was an important link in the development of a new type of seismometer for measuring extremely long period with vibrations (up to 60 seconds). To achieve the sensitivity and long natural period of vibration required for accurate measurements of long-period waves, the seismometer employs a seismic mass which is suspended on an air film and constrained to follow an essentially horizontal guide rod. …

Computer Programs For Determining Radar Return Power And Fading Spectra, Chung Chia

Electrical and Computer Engineering ETDs

The properties of radar terrain return at near vertical incidence have been under investigation at the University of New Mexico with Sandia Corporation, Albuquerque, New Mexico, and the United States Naval Ordinance Test Station, China Lake, California.

Correlation Of The Atterberg Limits And The California Bearing Ratio Values For Soil-Cement Media, Vernon E. Kerr

Civil Engineering ETDs

Tests were made on three different soils, using controlled amounts of Portland cement and water. All tests were made using a standard liquid limit device or a six-inch mold. The variables were amounts of Portland cement, degree and thoroughness of mixing, moisture content, curing and compaction of samples. The recommended procedures for performing the Plastic Limits Test, Liquid Limits Test and the California Bearing Ratio Test were followed with very few exceptions. All values obtained from testing are entered in the report and no retesting was done.

Mix Design Study And Compressive Strengths Obtainable From Pumice-Aggregate Concrete, Benjamin F. Snow

Civil Engineering ETDs

Compressive strengths of pumice-aggregate concrete were examined by introducing controlled variables into the mix proportions. A mix design method is presented, and this method was analyzed for consistency and feasibility.

Attempts To Grow Metal Single Crystals By Strain Anneal, Donald James Mcmillan

Bachelors Theses and Reports, 1928 - 1970

The growth of such crystals in the solid state eliminates these problems to a considerable degree. Therefore, the purpose of this study was to grow a metal single crystal of predetermined orientation in the solid state utilizing the strain-anneal method.

Transient Sensitivity Of Piezoelectric Accelerometers, William E. Baker

Electrical and Computer Engineering ETDs

No abstract provided.

Design Of Crystal Filters, Charles E. Schmidt

Electrical and Computer Engineering ETDs

This thesis concerns the application of electromechanical impedance elements to electric wave filters, so it is appropriate to begin with some discussion of such elements. The most important type is the piezoelectric resonator, most commonly made quartz.

Experimental Determination Of Dynamic Stress Concentration Factors In Rectangular Steel Bars, Jerome E. Ligocki

Civil Engineering ETDs

Stress concentration factors obtained from impact tests indicate substantial agreement with experimentally derived static stress concentration factors. Testing was limited to one 3/8 diameter centrally located hole in a long rectangular bar 2 inches wide. The hole was located at a bar cross section where a plane wave was found to exist. Stress pulse lengths as short as 50 microseconds duration was used in the experiments.

The experimental results confirm the ability of the resistance strength gage to accurately measure stress pulses. The proper amplitude response of the gage is proven by comparison with dynamic and static test results. The …

Evaluation Of New Mexico Asphaltic Concrete Aggregates By The Sand Equivalent Test, John P. Boyd

Civil Engineering ETDs

No abstract provided.

Practical Analysis Of Blocking Oscillators, Richard D. Griffith

Electrical and Computer Engineering ETDs

The objective is to give a method of treatment of blocking oscillator circuits which will be of practical value for circuit design. An attempt has been made to reach a good compromise between accuracy, generality, and usefulness. The use of statistical methods to complement the mathematical analyses is stressed.

Chelation Reactions In Montmorillonite Clays, Donald Edward Mahagin

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation was the study of reactions between the cations which are absorbed between the basal planes of montmorillonite clay and certain commercially-available organic reagents.

The Influence Of Water-Reducing Admixtures On The Curing Of Concrete, Wallace Don Budge

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The use of water-reducing admixtures in concrete has grown continuously since their introduction over 25 years ago, with a present estimated usage in the production of 25 million cubic yards of concrete annually in the United States alone. Opposition to anything added to concrete, other than cement, aggregates, and water, is gradually disappearing, and considerable recognition is being given to the value of using other ingredients.

The research contained in this study may be divided into two portions: tests to determine the rate of volume change of cement paste and compressive strength tests to indicate the effect of moist curing …

Soil Moisture As A Factor In Streamflow Forecasting For Logan River, Utah, Yu Kam Fok

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Purpose

Forecasting the annual water supply in an arid area by using the water content of snow on watersheds on some particular date, such as April 1, has become a very useful practice. Although these forecasts have given results of great practical value, they have sometimes been considerably in error. Seeking to minimize error, forecasters have incorporated various additional data such as temperature and antecedent rain to improve the relation between snow measurement and measured runoff.

Numerous methods have been suggested in the search for a reliable streamflow forecasting equation and various data have been used. Nearly all of the …