Engineering Commons^™

An Acoustic Simulator For Modeling Backscatter Of Electromagnetic Waves, Allen R. Edison

Electrical and Computer Engineering ETDs

Model experiments are commonly employed in situations where a full-scale experiment is uneconomical and where exact theoretical analysis is very difficult. The physical problem is scaled to convenient laboratory dimensions and a means is provided for controlling and measuring the parameters of the experiment. Measurements made in the model system are required to provide information on the time and space variations of functions which describe the real system. When interpreting results it is frequently necessary to consider "scale effects" which arise from certain parameters exerting a different influence in the model than in the real system.

Propagation Between Conducting And Nonconducting Media, Richard H. Williams

Electrical and Computer Engineering ETDs

This paper contains a study of the electromagnetic fields caused by electric dipoles located within a highly conductive medium such as the sea. The theoretical treatment of this problem was begun in 1951 with Moore's thesis. "The Theory of Radio Communication between Submerged Submarines." Some subsequent major theoretical treatments of this problem have been published by Wait and Campbell, Lien, Banos and Wesley, and Anderson. All of the above work stems from Sommerfeld's classic paper published in 1909 where he considers the fields in the air caused by a vertical electric antenna located on the interface between the air and …

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 …

Analysis Of Radio Wave Propagation Over An Atmospheric Ground Layer By The Ray Tracing Method, Donnelly J. Johnson

Electrical and Computer Engineering ETDs

Previous efforts to analyze radio wave propagation in the troposphere have shown by agreement with experimental results the validity of the use of geometrical optics and the assumption of atmospheric spherical symmetry.

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.

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.

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 …

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.

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.

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.

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.

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.

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 …

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 …