Engineering Commons^™

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 …

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 …

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 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.

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 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. …

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.

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.

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 …

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.

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.

A Study Of Drift Mobility In Neutron Irradiated N-Type Germanium, William H. Closser

Electrical and Computer Engineering ETDs

With the advent of the transistor in the late 1940's have come an entirely new field of engineering and a greatly renewed interest in solid state physics. This paper will be concerned in general with the electrical properties of these materials, and specifically drift mobility of the minority carriers in n-type germanium. The minority carrier in n-type material is the hole. The definition of drift mobility is: the mean carrier velocity per unit electric field.

The Fields Of Electric Dipoles In Sea Water- The Earth-Air-Ionosphere Problem, Wallace L. Anderson

Electrical and Computer Engineering ETDs

In the initial part of the following investigation; expressions will be obtained for the Hertz potential in three regions of arbitrary conductive and dielectric properties. The regions are separated from each other by two infinite parallel planes. In directions normal to these planes, the regions above and below the intermediate layer are considered to be of semi-infinite extent. The regions are individually homogeneous. An electric dipole is located in one of the semi-infinite media, which will be called medium 1. The intermediate layer is called medium 2, and the other medium 3.

Acceleration Of A Symmetric Plasmoid In An Axial Magnetic Bias Field, Richard Daniel Jones

Electrical and Computer Engineering ETDs

A pulsed gas, electrodeless discharge, plasma accelerator facility has been developed for experimental studies of the coupling mechanism for the transfer of energy from a driving magnetic field to a plasma. Gas at low pressure is ionized by an azimuthal electrical field induced through the action of a rapidly varying axial magnetic field produced by the flow of current through a ring surrounding a confining glass shock tube. The tube is arranged to permit radial expansion of the ionized gas. Due to its conductivity, the plasma, once it is formed, can exclude the rapidly varying driving magnetic field for a …

Shape Factors For Conduction Of Heat, Harry J. Otway

Mechanical Engineering ETDs

The purpose was to measure the heat conduction shape factors for cylinders and square prisms enclosed by spheres and to estimate the accuracy of the following approximation. This approximation is that of matching the area of the cylinder or prism to an equivalent sphere and then applying the analytical solution for concentric spheres.

A Radar Refraction Correction For Symmetric And Nonsymmetric Tropospheric Index Distributions, Ralph J. Rainey Jr.

Electrical and Computer Engineering ETDs

The high precision radars now in use have demonstrated the need for more exact refraction correction than is afforded by any fixed "standard" refractive index profile. The precision capabilities are even substantial enough to cause concern over the possible effects of the non-symmetric index distribution which introduces azimuthal errors. However, the indications are that the present limitation on true range measurements are primarily due to limitations on the radar itself, and a "gross" average correction is adequate for many cases of interest.

A Development Of An Equivalent Circuit Of A Hall Generator Which Utilizes A Flux Concentrator, Laurence L. Rosier

Electrical and Computer Engineering ETDs

The development of the transistor has brought about a great deal of research in the field of semiconductors. One of the results in this research is the development of the Hall effect. A number of new devices which utilize the Hall effect have been proposed; however, more theoretical and experimental work is required to determine which of these devices are practical. The success of the equivalent circuit approach in the other fields of electrical engineering suggests that an equivalent circuit which would represent Hall effect devices would be useful. The development of such an equivalent circuit should be centered about …

A Study Of The Concrete Making Properties Of Idealite Lightweight Expanded Shale Aggregate, John J. Ahlskog

Civil Engineering ETDs

Among the many commercially produced lightweight aggregates, Idealite seems to exhibit many desirable qualities. According to the available literature, the expanded shale group of lightweight aggregates are capable of producing concrete with excellent structural characteristics, and one researcher found that expanded shale aggregate produced in rotary kilns resulted in the lowest weight aggregates of the ten groups that he studied.1 While having low creep and shrinkage values, Idealite has been found to give strengths equal to or better than that of conventional sand and gravel concretes.

Idealite concretes are also reported to have excellent workability properties.^

A Study Of A Plane Dislocation Problem, Daniel D. Kana

Mechanical Engineering ETDs

This paper treats a more complete solution to the logarithmic spiral problem. Some changes in the basic dislocation theory are first accomplished to generalize the form of functions involved. The resulting equations are then applied to the logarithmic spiral dislocation at a hole in a large plate. A complete solution of pertinent stresses is obtained. Data are calculated to obtain the required dislocation relation along the logarithmic spiral cut, circumferential stress at the hole, and maximum shear stress along the dislocation cut.

Critical Masses Of Oralloy Cylinders With Multiple Reflectors Of Medium Z Elements, David P. Wood

Mechanical Engineering ETDs

Critical mass is influenced mainly by the density, concentration, and shape of the fissionable material, the degree of neutron moderation, and the type and thickness of reflector material. Most of these parameters have been explored in detail at the Pajarito Remote-Control Laboratory (1) and the present series of measurements has the purpose of investigating reflector materials in the middle of the periodic table for the more subtle influence of their resonance scattering structure.

Pulse Height Digitizer For Fast Random Pulses, Andrew E. Pope

Electrical and Computer Engineering ETDs

The purpose of this project was to develop airborne electronic equipment which would digitize the amplitude of random, fast, video pulses to an accuracy greater than one percent. For a detailed description of this task, refer to Appendix A, Research Contract Proposal 56-13AEE, “Development of an Anglo-To-Digital Converter.” This report covers the complete system design and the development of several basic circuits, in their practical form, which demonstrate system design feasibility.

A Study Of The Flow Characteristics In The Core Region Of The Sandia Engineering Reactor, James A. Moeller

Chemical and Biological Engineering ETDs

The core region of a nuclear rector is an extremely compact area with a capability of providing a very high heat output. Regardless of the type of coolant used, the heat transfer characteristics of this region must be adequately designed to prevent any undesirable "hot-spots" from developing. The Sandia Engineering Reactor has one of the most compact cores of any in currently operating nuclear reactors. For this reason it is necessary to investigate fully the heat transfer characteristics of the core. The rate of heat transfer from the fuel elements to the coolant is directly dependent upon the temperature difference …

Demodulation Of A Special Am-Fm Signal, Donald W. Dearholt

Electrical and Computer Engineering ETDs

As telemetry becomes more and more important in returning information, new types of modulation arise. Sometimes the modulation used is a direct result of a particular type of transducer, although the output of the transducer may be modified before the carrier is modulated to cause a very different type of signal than would otherwise have occurred.

An Evaluation Of The Beggs Deformeter In Two-Dimensional Structural Analysis And An Investigation Of The Deformeter In Three-Dimensional Structural Analysis, Dwight F. Denton

Civil Engineering ETDs

It was the purpose of this thesis to evaluate the Beggs deformeter in two-dimensional structural frames and then investigate the possible use in three-dimensional structural frames. It is intended in dealing with the subject to explain and describe the deformeter apparatus and verify the theoretical principle through actual structural model analysis.