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Characteristic Impedance Of Open Microstrip Transmission Lines Having Finite Thickness And Multiple Dielectric, Philip Julian Carter

Masters Theses

"A computer program is provided for determining the characteristic impedance of microstrip transmission lines having finite thickness. Infinite and finite ground planes are incorporated into the program. The programmer need only supply information in the form of a data card. This procedure is clearly outlined.

Graphical solutions of characteristic impedance for multiple dielectric microstrip transmission line problems are obtained using a discrete resistive analogue. Computer network analysis programs are viewed as having several advantages not possessed by the physical resistive analogue"--Abstract, page 2.

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

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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.

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.

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 …

Production And Spectral Determination Of Low-Energy, Flash X Rays, Robert I. Loebman

Electrical and Computer Engineering ETDs

With the rapidly expanding use of X-radiation devices for medical, industrial and military purposes, the need arises for diverse methods of producing and measuring the X-ray portion of the electromagnetic spectrum.

X rays may be purposefully produced by a source in a continuous manner, in short pulses or flashes or in a random manner. X rays are also produced undesirably by devices having extremely high voltages or as a byproduct of some energy-producing device such as a nuclear weapon. In most cases X radiation is produced over a wide spectral range of varying intensities rather than at discrete energy levels …

Electronic Technique For Resolving Ambiguities Of Sinusoidal Function Transducers., James W. Campbell

Electrical and Computer Engineering ETDs

A circular function transducer is a device whose output is a circular trigonometric (sinusoidal) function of the input to the device. The sinusoidal nature of this class of transducer's output results in identical responses for many admissible inputs. Consequently, an ambiguity exists as to which of the many possible input values produce any particular output value. Even a history of the output from an initial reference input becomes ambiguous once the output completes one cycle of the sinusoid. To be a generally useful instrumentation component, the ambiguity of circular function transducers must be resolved.

Circular function transducers are currently used …

The Effect Of Nuclear Radiation On Oxidized Silicon Surfaces., Jerry A. Hood

Electrical and Computer Engineering ETDs

The change in properties of oxidized silicon surfaces with nuclear radiation is most apparent in devices controlled from the surface. The two devices of most specific interest are the insulated gate field-effect transistor and the metal-silicon dioxide-silicon capacitor. This chapter reviews the basic operating theory of these devices excluding the radiation induced defects. Many other devices such as the fieldister and surface-controlled avalanche devices would be equally or more sensitive than the two devices chosen for study. The devices chosen, however, are those of most immediate interest for use in a nuclear radiation environment .

An Analysis Of The Impedance Of Two Types Of Electric Antennas Designed For Undersea Applications., Vincent R. Chavez

Electrical and Computer Engineering ETDs

The problem of radio wave propagation using antennas submerged in sea water has received much attention in recent years. As early as 1940 Norgorden [1] prepared a paper on the problem of propagation of radio waves from a transmitting antenna in air to a receiving loop antenna in sea water. Further work on the loop antenna was performed in 1946 by Quinn and Norgorden [2]. An analysis of a Hertzian dipole in an infinite, conducting medium was done by Tai [3] in 1947. He showed that a meaningful expression for the radiation resistance of the Hertzian dipole in a conducting …

An Analysis Of The Signal Processing In A Radio Altimeter Utilizing Random Angle Modulation, Donald F. Post

Electrical and Computer Engineering ETDs

Excerpt from the introduction:

This paper presents an analysis of the signal processing in a continuous wave, fixed-range, radio altimeter which utilizes random angle modulation, i.e., the modulating function is a sample function from a random process. The mathematical model of the altimeter is shown in block diagram form in Figure 1, and the physical situation in which the altimeter operates is illustrated in Figure 2. As shown in Figure 2, the altimeter is assumed to be on the vehicle "V" which has a relative velocity v with respect to the reflecting plane P. The velocity vector might have any …

A Study Of Learning In Adaptive Systems., In Ku Kang

Electrical and Computer Engineering ETDs

The purpose of this study is to investigate the structures of learning processes and their applications to adaptive systems. The learning processes in this study are based on Bayes learning model, which well describes the nature of learning and also is a natural choice from the viewpoint of statistical decision theory.

On The Application Of Bayesian Learning In Discrete Communication Systems., Chien Fong Chao

Electrical and Computer Engineering ETDs

It is the requirement of many communication systems that the transmission of information should not only be reliable, but also efficient with respect to the capacity of the communi­cation channel used.

Improving The Reliability Of Electronic Systems By Minimization Of The Variances And Stabilization Of The Mean Values Of The System Performance Criteria, Emil Carl Neu

Dissertations

The parameters of an electronic system are not deterministic variables; but rather because of variations in manufacturing processes, they are randomly distributed variables. In addition, aging mechanisms will cause these parameters to drift with time. As a result of both of these factors, the system performance criteria deviate from their initial design center values. This research studied the effect of component parameter variations upon these electronic system performance criteria and then presented a thesis to minimize the effect of these variations.

The distributions of the performance criteria were obtained as functions of the parameter distributions, by first approximating the performance …

Design Of Feedback Control Systems With Transport Lag By Parameter Plane Techniques, Lawrence Eisenberg

Dissertations

A method is presented for the exact determination of absolute and relative stability of linear feedback control systems containing transport or distributed lag. All results are in terms of two variable system parameters. The method utilizes an extension of modern parameter plane techniques that allows for the inclusion of transcendental functions in the system characteristic equation. The design of controllers in linear systems containing transport lag is then considered. A design technique is proposed that allows for the systematic determination of two variable controller parameters in order to meet frequency or time domain design specifications.

The design technique is formulated …

Transient Radiation Effect On Semiconductor Controlled Rectifiers, Wilford D. Raburn

Electrical and Computer Engineering ETDs

Excerpt from the Introduction:

The three terminal PNPN switch which we will refer to as the semiconductor controlled rectifier or SCR has electrical characteristics quite similar to the gas thyratron [7]. In the SCR, current is carried by electrons and holes whereas, in the thyratron, it is carried by electrons and ions. Both have high impedance in the "off" state and low impedance in the "on" state. Both devices will remain in the conducting mode once they have been triggered, even if the gate signal is removed.

The operation of the SCR depends upon the internal feedback mechanism [ 22]. …

A General Approach To The Analysis Of Particle Transport In Solids--With Particular Application To High Frequency Effects On Charge Transport In Semiconductor Devices, Raymond A. Gore

Electrical and Computer Engineering ETDs

The purpose of this first chapter is to review the basis of the diffusion theory description of particle motion in solid material and its application in the analysis of semiconductor devices. Diffusion theory, as used throughout this dissertation, will be used to mean the special case of the more rigorous transport theory that results from assuming an infinite particle velocity and a constant ratio of particle velocity to the probability of a collision. Thus, the discussion of diffusion theory begins with transport theory, and in particular with the Boltzmann transport equation. Therefore, this chapter begins with a formulation of the …

The Effect Of Potential Representation On The Electron Scattering At Low Energies., Ahmed K. Aboul-Seoud

Electrical and Computer Engineering ETDs

One of the most useful approaches for gaining understanding of atomic structure is that of experiments involving electron scattering from atoms. In particular, knowledgle of differential and total elastic scattering cross sections enables one to calculate momentum transfer cross sections, mean free path, and the width of multiple scattering distributions. From the point of view of a theorist, the central question is that of the interaction potential. A representation of this latter quantity will give rise, mathematically, to a two point boundary value problem involving the Schrödinger equation. Upon solving the Schrodinger equation, and satisfying the appropriate boundary con­ditions, the …

Derivation Of Transfer Functions From Time Delay Specifications And Their Approximations., Nasir Ahmed

Electrical and Computer Engineering ETDs

The derivation of transfer functions from given time delay functions. In the sinusoidal steady state, a transfer function may be written as H(jw)= |H(jw)| e^jB(w)

Where B(w) is the phase angle. Then the corresponding time delay function Td is defined as Td = -dB/dw

Space-Charge Effects As Determined By Initial-Field Conditions, Tsing-Yih Wang

Masters Theses

"A method for calculating the current density passing between two parallel plane electrodes for different values of positive charges as a function of " field at the emitter to field for no charge ratio " is presented.
The problem of the potential distribution between the electrodes has been solved for one particular case in which the positive charges are assumed to be proportional to the field at the emitter. The expressions for the electric field, the velocity of charges, and the charge density as a function of the potential are also presented and plotted as a function of the distance. …

An Application Of The Variable Gradient Method Of Generating Liapunov Functions To Discrete Systems, Henry N. Peterson

Masters Theses

"The variable gradient method of generating Liapunov functions has been used only for continuous systems. This thesis presents an application of the variable gradient method to non-linear sampled data control systems.
Certain modifications to the variable gradient method are developed and several examples are presented which demonstrate the application. An attempt was made to synthesize the control system parameters, but due to the complexity of the ΔV functions, the synthesis in general cannot easily be obtained . To circumvent the problem of determining if the ΔV functions are negative definite, a set of computer programs were written to determine a …

A Probability Density Analyzer, Thomas K. Bohley

Masters Theses

"A means is presented by which the probability density of statistical signals may be determined experimentally. The design and construction of an electronic test instrument to measure probability density is discussed. Operating instructions and circuit diagrams are also included"--Abstract, page ii.

Nonparametric Detection Of Signals Causing Arbitrary Changes In The Accompanying Noise Backgrounds, John Joseph Komo

Doctoral Dissertations

"The detection of signals in the presence of noise is an important problem in the field of communications. The detection problem is concerned with the design of systems which determine only the presence or absence of a signal which occurs with background noise. An example of considerable importance, which is encountered quite frequently in practice, is the radar detection problem. In the radar problem it is desired to determine the presence of a target by detecting the presence of a radar return signal in noise. Another example is the seismic exploration problem which utilizes the detection of reflected signals from …

An Ac Method Of Measuring The Conductivity Of Dielectric Liquids., Henry E. Fischer

Masters Theses

"The problem undertaken in this thesis is the presentation of a method of measuring the conductivity of dielectric liquids in which the liquid is used as the parallel tank circuit of a modified Wien-bridge oscillator. The main advantage of this method is that the frequency of the voltage applied to the liquid can be varied by simply varying the oscillator frequency. This allows the selection of a frequency which is best suited to the liquid in regard to polarization and relaxation time.

An oscillator was designed, built and used in the laboratory to measure the conductivity of the dielectric liquids …

Analysis Of Time-Varying Linear Multipole Filters With Sampled Nonstationary Random Inputs, Ming-Chwan Chow

Masters Theses

"In this thesis an analytical method is developed to determine an optimum time-varying linear filter in order to satisfy the following specifications. The filters are of sampled data multipole form with n inputs and m outputs. The signal of each input is a member of a nonstationary random process, and the signal is corrupted by stationary noise.

The statistical optimization theory developed by Wiener is extended to a linear time- varying filter with nonstationary input. Correlation functions are defined for nonstationary ensembles. The mean- square error is calculated in terms of these correlation functions. By minimization of the mean-square error, …

Determining The Best Computational Method For Simulation, Neil Hertenstein

Masters Theses

"Two related problems are treated in the discussion. First, what is the best computational means to be used to simulate a given system? Second, if hybrid is chosen, how do we assign the problem to the different computers to realize the fullest advantage of the hybrid simulation? Most of the available information in the literature is presented in light of the above questions. It is found that, despite the lack of a precise theoretical solution, much insight can be gained into the problem. A proposed procedure for hybrid assignment and a sample problem using this procedure completes the discussion"--Abstract, page …

A Periodic Dielectric Rod Antenna, Robert C. Peirson

Masters Theses

"The periodic dielectric rod antenna structure under consideration consists of identical dielectric rod sections of radius a meters situated on a common axis. These sections are of length 1₁ meters and are separated in free space by distance 1₂ meters.

Field analysis employing Floquet's theorem, in terms of the exemplary TM₀₁ circular mode, gives expressions for the various field components and an eigenvalue equation. Digital solution of this eigenvalue equation establishes the location of propagation bands as a function of frequency. Such bands are characteristic of any periodic wave guiding structure."--Abstract, page ii.

Analog Simulation Of The Voigt Solid, Richard F. Pohl

Masters Theses

"A method of reducing a mixed partial differential equation with boundary conditions to a form suitable for programming on the analog computer is developed. Presented along with the computer program set up to be used on the EAI TR-48 analog computer is a systematic check procedure to indicate possible computer malfunctions and programming errors. The results of the computer simulation are presented and supported with observed data"--Abstract, page ii.

An Algorithm For The Synthesis Of Nand Logic Networks Using A Diagrammatic Approach, Donald Robert Nelson

Masters Theses

"A diagrammatic approach is presented for the synthesis of multilevel NAND networks realizing combinational logic expressions. The network synthesized is restricted to only uncomplemented inputs. The synthesis algorithm involves the determination of minimum sum of products and product of sums expressions for a Boolean function, construction of an α-ß diagram from these expressions followed by implementation with NAND gates directly from the diagram. The resulting network is a minimal or near minimal NAND gate realization of the given function. The algorithm is applicable to completely or incompletely specified Boolean functions and is extended to include NOR synthesis"--Abstract, page 2.

A Nonlinear Sampled Data Feedback Control System Employing Pulsed Thrust Position Control, John D. Corrigan

Masters Theses

"This thesis shows that reaction jet thrust pulses, each of constant amplitude and time duration, in conjunction with sampled data error information can provide satisfactory position and/or attitude control for space vehicles.

Incremental phase-plane analysis of the system yields a technique for determining system response and suggests a means of compensation. Control system response for the vehicle under the influence of external forces is shown to be satisfactory by digital computer simulation"--Abstract, page ii.