Engineering Commons^™

An Ultrasonic Pulse Generator Using The Transducer As A Frequency Determining Element, Donald E. Watke

Masters Theses

"This paper describes the development of a method of ultrasonic pulse generation in which the transducer determines the frequency of oscillation. A definite advantage of this method is the ability of the frequency of oscillation to change with changes in the transducer mechanical resonant frequency. This maintains peak efficiency at all times. The method is demonstrated in a small sonar transmitter but could be applied to any area involving driven ultrasonic transducers"--Abstract, page ii.

Solid State Squib Simulator, Ernest Paul Lee

Masters Theses

"The simulators described in this paper allow checkout of the electrical control circuitry of pyrotechnic and related devices where the actual testing of the devices would be destructive. A simulator is described that is superior to the units now available for test purposes. Solid state components are used exclusively and hence it is very light weight and reliable. It is portable and requires no external power for indication of the control circuitry performance. The simulator presents a load that is adjustable between one and five ohms for a controlled length of time from one to one hundred milliseconds. Transients will …

Design Of A Sequential Detector, Scott William Abel

Masters Theses

"The communication engineer has in the past treated the detection problem from a limited point of view. Detectors have been designed to reach a decision based on a specified number of samples. This approach has proved valuable, but it offers no provisions for an early decision if a conclusion becomes obvious early in the sampling. Neither is there an opportunity for additional sampling if necessary to reach a definite conclusion, because of these limitations it is desirable to find more general detectors. This study looks at a specific statistics (the sign test) and designs a sequential detector to utilize this …

Recombination Statistics For The Neutron-Induced Base Current Component, Ming-Chwan Chow

Doctoral Dissertations

"This paper presents a derivation of the recombination statistical model for the neutron-induced base current component. The derivation was based on the assumptions: 1) the current equation for the induced current component developed by Goben is valid; 2) the Shockley-Read-Hall statistics for holes and electrons are applicable; and 3) the recombination statistics derived by Sah, Noyce and Shockley, for sites in the bulk space-charge region are valid. Several examples were presented to emphasize accuracy of this derived model for predictions. This paper shows that the recombination process may be described by a mathematical model, recombination statistics which depend on the …

Distributed Parameter Rc Network Analysis, Robert C. Peirson

Doctoral Dissertations

"Methods of analyzing uniform and tapered distribute [sic] parameter RC networks are reviewed and correlated in this dissertation. Multilayer networks and simple three layer networks are considered. Analogies between two-wire transmission line theory and multilayer distributed network theory are developed, i.e., standing wave and traveling wave concepts. An accurate computer-aided steady state analysis procedure is presented which has a solution accuracy that can be determined prior to actual analysis computations. The impulsive response of the uniform RC network is investigated with the goal of measuring the network's parameters. Procedures to determine the parameters R and C of a uniform RC …

Nonparametric Sequential Detection, James Charles Fowler

Doctoral Dissertations

"This dissertation extends the theory of the Wilcoxon-Mann-Whitney U statistic so that this statistic can be used to perform sequential tests on hypotheses. This sequential test procedure makes use of a sequential ranking procedure similar to the one first introduced by Parent. The operating-characteristic function and average number of samples function for this new test are calculated as a function of the signal to noise ratio. The test is then shown to be efficient for several forms of alternatives with an efficiency of 95% against the Wald Sequential Probability Ratio Test for a constant signal in normal noise. Finally, the …

Signal Theoretic Characterization Of A Function Using Positive Exponential Basis Functions, James Julius Baremore

Doctoral Dissertations

"A signal theory characterization of a time function or signal is a representation of the function throughout a sample interval by an orthogonal basis function expansion. The characterization described here obtains the coefficients in the expansion by processing the input waveform, in real time, through a system of three terminal passive RC filters. The outputs of the filters are sampled periodically and the coefficients of the basis function expansion in that interval are related to these values. The basis functions result from an exponential transformation applied to the Legendre polynomials and are orthogonal in time over the sample interval. The …

Multiport Synthesis With Multi-Layered Distributed Parameter Rc Networks, Walter Ronald Koenig

Doctoral Dissertations

"Synthesis and design techniques for multiport, multilayered, distributed parameter RC networks are investigated in this dissertation. The basic building block is a network section of uniform width consisting of alternate layers of resistive and dielectric materials on top of a perfectly conducting plane. The resulting network is composed of a cascade of these sections with all access terminals at one end of the cascaded network. The terminals at the other end are either open circuited or short circuited. A method is discussed for synthesizing a network from a prescribed network admittance matrix. An approximation technique is given for obtaining a …

A Method For The Calculation Of The Electric Microfield Distribution In A System Of Charged Hard Spheres, Ronald M. Flegal

Masters Theses

No abstract provided.

Alternating Current Method Of Measuring The Electrical Conductivity Of Dielectric Liquids, Henry E. Fischer, Ralph S. Carson

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

A Study Of A Differential Equation Found In Wave Propagation And Scattering Theory, Larry W. Thacker

Electrical and Computer Engineering ETDs

The study of a differential equation that is found in the study of the scattering of waves from an inhomogeneous media and in atomic collision theory is presented. Several integral formulations for obtaining approximations to the solution are discussed and studied. Means of determining the phase shift in electron scattering problems are presented, and two methods for obtaining the reflection and transmission coefficients are developed and discussed.

Numerical Studies Of An Inverse Pinch Device, John Richard Freeman

Electrical and Computer Engineering ETDs

The inverse pinch configuration has been recognized as a possible means of producing stable, repeatable shock waves in a plasma for laboratory investigation. The simple geometry permits investigation of cases with or without an initial transverse magnetic field in an un-ionized or pre-ionized medium. Previous analytic work for this geometry has been restricted to a snowplow model, sometimes including coupling with the external circuitry. The solution presented here consists of a finite difference, Lagrangian coordinate system solution for a one-fluid hydromagnetic model. The hydromagnetic model chosen includes the effects of a variable degree of ionization, assuming a hydrogenic plasma. Complete …

Compensating Techniques For Reducing The Response Of Transistor Circiuts In A Transient Radiation Environment., Goebel Davis Jr.

Electrical and Computer Engineering ETDs

The effect of transient radiation on electronic components has become a vital concern of the military. It is mandatory that certain critical ground installations, aircraft, and missile systems for the military be both reliable and effective and if possible not be rendered temporarily or permanently inoperative due to exposure to a pulse of gamma radiation.

The Development And Use Of A Double Beam Photoelectric Polarimeter For The Study Of The Faraday Effect, John Norman Rowe

Masters Theses

No abstract provided.

Water Resources Of Tacoma, Washington, Richard Martin Glaser

Graduate Student Research Papers

This study explores the fresh water and hydroelectricity resources of the City of Tacoma, Washington. The history and development of the water supply and hydroelectric facilities is examined. One can see that the development of the water resources has been directly affected by the growth in population and industry and that the nearness to the city of development sites has been an aid in this development. With the amount of water available at present and the increase in hydro-electric facilities during this decade, the future outlook for Tacoma in the field of water resources seems bright.

Avalanche Transistors And Diodes In A Transiecnt X-Ray Environment., Harold Thomas Cates

Electrical and Computer Engineering ETDs

The performance of avalanche transistors and diodes was investigated under transient X-ray irradiation. The diode depletion and diffusion components of radiation induced photocurrent are related to known physical constants and measurable diode parameters. Additionally, the photocurrent was related to the avalanche phenomenon and incorporated in equivalent circuits. The peak value of the transient photocurrent increased up to the avalanche break­down voltage of the diode. An equivalent circuit is given for the region prior to breakdown, which indicates that this avalanche multiplied photocurrent can be inserted as a current generator across the function. After breakdown occurred and the reverse bias voltage …

Linear And Adaptive Delta Modulation, John Edward Abate

Dissertations

New results are presented offering insight into the performance and optimization of linear and adaptive delta modulation, together with a comparison with pulse code modulation. The results are applied to three cases of practical importance: television, speech, and broadband signals.

The results presented can be grouped into the following three categories. First, a performance characterization of linear delta modulation (DM) is given. With the aid of certain empirical observations made from computer simulations, closed form expressions are found for granular noise, overload noise, and minimum quantization noise powers. These results permit the prediction of the optimum performance obtainable from DM …

Effects Of Partial Coherence On Holography, Michael Jay Lurie

Dissertations

The theory of two-beam holography is generalized to include quasi-monochromatic radiation of any degree of spatial coherence. It is shown that a clear, undistorted reconstruction can be obtained provided the reference beam is highly coherent. The effect of the partial coherence of the illumination is only to make the reconstructed image darker. Specifically, the amplitude of the radiation at any point of the image is proportional to the amplitude of the radiation leaving the corresponding point on the object during the exposure, times the magnitude of the coherence between the latter radiation and the reference beam. Holograms made using either …

An Analysis Of Transmitted Signal Distortion Resulting From Antenna To Reflecting Surface Velocity., J. Philip Castillo

Electrical and Computer Engineering ETDs

This paper presents a stud of the distortion of a transmitted signal due to Doppler frequency spreading and amplitude modulation as a consequence of the relative velocity between the transmitter and a reflecting surface.

The Doppler effect is a well-known phenomenon associated with the apparent compression, or length of the transmitted signal wave-length, resulting from a positive or negative relative velocity between a transmitter and receiver. In this thesis one of the problems will be the determination of the degree of frequency spreading due to a finite antenna beam width as the transmitter approaches a reflecting surface at a constant …

Energy Transfer And Electron Conduction In The Fluid Transpiration Arc Column, Pin-Seng Tschang

Dissertations

The energy relaxation and electrical conductivity of an electron gas in one atmosphere argon arc discharge has been examined theoretically and observed quantitatively in an experimental arrangement. The plasma column utilized for study is the type generated in a fluid transpiration arc equipment in which the argon working fluid is injected through a porous graphite anode. The rate of forced convection is such as to insure significant electron-heavy particle nonequilibrium in the sample volume of interest. A simple model of a developing arc column with internal heat generation indicates that, with typical rates of argon injection realized in practice, the …

The Effects Of Solar Magnetic Activity On Electric Power Systems, John C. Slothower, Vernon D. Albertson

Journal of the Minnesota Academy of Science

Disturbances an large electric power transmission systems have been attributed to magnetic storms following solar flares. It can be shown that these magnetic disturbances are of the proper nature and magnitude to produce the documented effects on these electric systems. It is anticipated that these effects may become more serious with the greater and greater geographical spread of interconnected systems. More research and information on causal relationships is needed.

Reviews Of Books And Papers In The Computer Field, James H. Tracey

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Analysis Of The N-Wire Exponential Line, Edward C. Bertnolli

Electrical and Computer Engineering Faculty Research & Creative Works

A new approach to distributed network analysis is presented with the analysis of the n-wire exponential line as example. This approach provides the distributed network's transfer matrix in a form useful for both transient and steady-state network calculations. © 1967, IEEE. All rights reserved.

Annealing Characteristics Of Neutron Irradiated Silicon Transistors, J. R. Chott, C. A. Goben

Electrical and Computer Engineering Faculty Research & Creative Works

When a transistor is subjected to neutron irradiation, a component of base current proportional to neutron fluence is induced. From the effects of annealing on the base and collector Currents the conclusion was drawn that there is an apparent difference in the annealing characteristics between the neutral and the space-charge regions of the semiconductor device. This study of the anomalous annealing indicates that the neutron-induced component of base current is a result of one, or a combination, of the following mechanisms: A quasi-tunneling recombination phenomena in the emitter-base space-charge region, or an influence of the p-n junction electric field on …

Correction To “Analysis Of The N-Wire Exponential Line”, Edward C. Bertnolli

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

An Analytic Model For The Fluxgate Magnetometer, Stanley V. Marshall

Electrical and Computer Engineering Faculty Research & Creative Works

The output voltages from various fluxgate probe types are found to have the same general form, and an analytic model has been developed with which the output may be calculated. In the saturation region where the output pulse is developed, the differential permeability can be closely approximated by an exponential, dB/dH = k₁H^_k2, where k^_l and k^₂ are on the order of 100 and -2.0, respectively, for cores of Supermalloy or Permalloy 80. Using this model, the effect of the nature of the excitation function on output pulse amplitude and width and the effect …

Determining The Transfer Matrices Of Tapered Multiwire Transmission Lines, Clyde A. Vandivort

Masters Theses

"The advent of monolithic and integrated microelectronic circuits has aroused interest in passive multilayered thin film networks. The basic thin film network is shown in Figure 1. This structure consists of alternate resistive and dielectric layers sandwiched together. Such devices are referred to as distributed parameter RC networks. The reduction of volume and increased reliability offered by thin film devices has caused considerable effort to be extended in the analysis of their characteristics....

The incremental equivalent circuit given in Figure 2 stems directly from the above physical parameters and is the circuit used as a basis for the analysis that …

A New Performance Index For Sensitivity And Energy Optimization., Mohamed Zafer Dajani

Masters Theses

"The principal aim of this thesis is to present a new index of performance which when minimized will simultaneously optimize the system energy and sensitivity function of a multivariable linear control system. With this performance index it is usually desirable to discriminate between the sensitivity factor and the energy term by weighting them differently. Two types of weighting factors are presented. Since it is not easy to minimize that performance index for all types of problems, further research is suggested to find methods of solution for such problems. Illustrative examples demonstrate the optimization process and the type of assumptions needed …

Construction Of A Laboratory Type, Convertible Excitation Argon Laser, Arthur P. Reckinger

Masters Theses

"The purpose of this thesis is to describe the construction of a general purpose, convertable [sic] excitation, laboratory type, argon laser. Quartz tubing was used in the final model while attempts to use alumina were made during earlier work. The final model has total optical power output of 230 mw at a discharge current of 29 amperes in the dc excitation mode. Provision was also made to utilize RF or pulsed excitation. The device is built so that several values of optical transmittance are available with a wide range of mirror placement"--Abstract, page ii.

A Programmed Synthesis Procedure For Asynchronous Sequential Circuits, Robert Judson Smith

Masters Theses

"The synthesis procedure for large asynchronous normal fundamental-mode sequential circuits is time-consuming and tedious when performed manually. This paper describes a series of computer programs which, given a machine specification in flow table form, automatically produces simplified normal form implementation design equations. The user may specify that either minimum-variable state assignments, or more rapidly generated near-minimum-variable codes be found. Next-state equations are formed using the generated state assignments and converted to simplified sums of products. Sample machines having flow tables of up to eighteen rows by four columns are synthesized"--Abstract, page ii.