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Analog Simulation Of A Plug Flow Tubular Reactor, Jon Douglas Carson

Masters Theses

"This thesis stresses the importance of analog and digital computers in the field of reaction kinetics. The analog computer is used to simulate a chemical reaction, the hydrolysis of acetic anhydride. The hydrolysis reaction takes place in a tubular reactor. The reactor is 3/4 inch in diameter and 20 feet long. These reactor dimensions allow the reaction system to approach plug flow, if the reactants flow through the reactor at turbulent flow rates. The physical, reactor, system is used to obtain experimental data for the hydrolysis reaction. The data is obtained at reactor temperatures between 75 and 100°F. Feed concentrations …

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 .

Tests On Light Gage Steel Diaphragms, George Winter, T. V. S. R. Apparao

CCFSS Library (1939 - present)

This report supplements and extends the scope of Report No. 319, ;lStructural Performance of Light Gage Steel Diaphragms", by Dr. Larry D. Luttrell. Eleven static load tests were conducted on 22 gage narrow rib roof decks to investigate the effect of length of the diaphragm, type of welding, and diaphragm material tensile properties on the shear stiffness and strength of the diaphragm. The behavior of a diaphragm under reversed load at two different levels) one at 0.4 x ultimate static load and the other at 0.6 x ultimate static load was explored by conducting five tests. The tests at a …

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 …

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.

Fm 30-16, Technical Intelligence, August 1966, Robert Bolin , Depositor

United States Department of Defense Military Intelligence

This is the first edition of FM 30-16, Technical Intelligence, since the massive reorganization of Army intelligence in 1962. The Army Intelligence Production Elements discussed include the Army Foreign Science and Technology Center and the Missile Intelligence Directorate of the Army Missile Command. In Change 1, the Medical Intelligence Office within the Office of The Surgeon General is discussed as well.

The manual explains the Army Technical Intelligence program, discusses procedures for collecting foreign materiel and information about foreign materiel in the field, and the responsibilities of the Army Intelligence Production Elements and the Defense Intelligence Agency in the continental …

Drag Coefficients For Magnetically Accelerated Spheres, Jann-Wuu Liang

Theses and Dissertations

The objective of this study was to determine the correlation of the drag coefficient of an accelerating sphere in the liquid medium over a range of Reynolds number from 0.1 to 100, 000. A magnetic accelerator was used to obtain an acceleration for the sphere, the data was recorded using a photograph and a digital computer was used to reduce the data.

On Stable Fractures In A Uniaxial Stress Field, Barry P. Shafer

Mechanical Engineering ETDs

The general interests of engineers in fracture mechanics are oriented through their interest in the structural strength. The studies branched into two major areas in fracture theory, namely the initiation problem and the stability problem. Although some of the initiation problems could be approached through the existing failure theories, other aspects are still active research subjects, such as the statistical theory of fracture. In the stability problem, we are faced with a situation in which the adverse condition already exists because cracks are present. Whether the presence of the crack under the loading condition is insignificant or critical is the …

A Procedure For The Measurement Of Glosso-Maxillary Forces, Howard L. Lilly Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this investigation was to develop a clinically feasible procedure for recording the magnitudes of glosso-maxillary forces at four palatal loci using an electronic transducer system described by Lear et, al. (1965). Of particular interest was the development of a convenient and accurate calibration device for both intraoral and extraoral application. A further object of interest was the effect an acrylic carrier plate might introduce to the magnitude of force response. Finally whether or not any significant adaptation to the carrier plate or to the transducers occurs during a reasonable testing period (six to seven hours).

A calibration …

Wave-Propagation Studies In Confined Sands., Warren J. Baker

Civil Engineering ETDs

An experimental study of the relationship between pertinent wave=propagation parameters and the one-dimensional stress-strain behavior of two sands was conducted. The stress-strain relation for the sands was characterized by a nonlinear strain-hardening behavior. The nature of the stress-chain curve implies that shocks should form or be sustained in the soil. This phenomenon was studied by observing the dynamic and kinematic characteristics generated by a soft-fronted stress pulse applied to one end of a long slender sample of confined sand. To develop a method of predicting the kinematics of wave propagation from the stress-strain curve, the observed wave-propagation parameters were related …

Solution Of Poisson's Equation In Two-, And Axisymmetric Three-Dimensional Geometry By Means Of A Capacitively-Coupled Conductive Paper Analog, Donald L. Hanson

Mechanical Engineering ETDs

Poisson’s equation is encountered in many branches of engineering analysis. For example, the velocity distribution of a fluid in steady laminar flow through a duct is described by Poisson’s equation. The stress distribution within cylindrical (including non-circular) torsion bars is described by the same equation. The temperature distribution within a body having distributed internal heat sources is still another physical quantity which requires the solution of Poisson’s equation for its determination. The internal heat sources of this last example may be of electrical, chemical, or nuclear origin.

Measurement Of Pressure And Velocity In A Heat Generated Acoustic Wave, Hernan Hirsch

Mechanical Engineering ETDs

The purpose of this study is (1) to investigate experimentally the magnitude and the phase angle between acoustic pressure ad velocity of the Sondhauss oscillation; (2) to investigate experimentally the pressure times velocity diagram; (3) to investigate experimentally the pressure versus volume diagram and its analogy to the Stirling heat engine, (4) to list observations of the behavior of the gas inside the tube, and the possible influence of these observations on the sound pressure level or velocity of the flow.

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 …

Effect Of Sample Geometry On Decay Constant Measurements In Water Using The Pulsed Neutron Technique, Debow Freed

Nuclear Engineering ETDs

The pulsed neutron technique has been employed at a steadily increasing rate since significant results from its use were first reported in 1954. This technique has permitted direct measurement of several parameters important in the nuclear field which previously had to be measured by indirect means.

An Experimental Investigation Of The Continuous Penetration Of A Blunt Body Into A Simulated Cohesionless Soil., John Lewis Colp

Civil Engineering ETDs

The penetration of one object into a larger mass may well have been one of the earliest interests of man. History shows that early man was well aware of the occurrence of the penetration event by his use of spears and other projectiles in his search for food. Interest in penetration events has been continuous through man's development. Today this interest has even outstripped man's natural environment to include the serious study of penetration into extra-terrestrial bodies such as the lunar surface.

The Problem:

The penetration of many materials is currently being studied by many investigators. Some of the materials …

Preliminary Design Of A Hydraulic Vibration Machine With Variable Amplitude And Frequency, Using Multistage Amplification And Feedback Control, Melvin Joseph Merrell

Theses and Dissertations

Essentially there are three types of vibration machines mechanical, electrodynamic, and electrohydraulic (hydraulic). Each of these machines has characteristics which make it suitable for particular areas of use.

A Preliminary Experimental Study Of The Turbulence Decay In The Wake Of A Hemisphere In Free-Surface Flow, Jiin-Jen Lee

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Flows observed in open channels are usually turbulent. The word "turbulent" describes a motion in which an irregular velocity fluctuation (mixing or eddying motion) is superimposed on the main stream motion. The essential characteristic of turbulent flow is that the turbulent fluctuations are random in nature.

If Reynold's rule of averaging is used, the Navier-Stokes equations for laminar flow may be transformed into the Reynold's equations, which hold true for turbulent mean motion. The solution of Reynold's equations will properly describe turbulent flow. Unfortunately, the number of unknowns exceeds the number of equations; therefore the use of mathematical method to …

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 …

Conversion Of Parahydrogen To Orthohydrogen, George A. Winkler

Chemical and Biological Engineering ETDs

Heisenberg (53) and Hund (57) postulated the existence of two modifications of hydrogen. This occurred as a result of Heisenberg's previous explanation of the existence for orthohelium and parahelium using quantum theory. From analogous considerations, he and Hund asserted that hydrogen was a mixture of two gases. Dennison (28) applied their theories to explain the falling off of the rotational specific heat of hydrogen. This had been observed by Eucken (34) in 1912. In 1928, Giaque and Johnston (45) held gaseous hydrogen at 85°K for six months. On liquefaction they found a detectable difference in vapor pressure. They stated that …

Electronic Computer Program For The Solution Of Slope Stability By The Wedge Method Of Analysis., James O. Boardman

Civil Engineering ETDs

Earth embankments and the foundation upon which they rest are subject to abear stresses induced by their own weight. It the embankment serves as a water retention structure, additional shear stresses are developed by seepage forces originating from pore pressure, from the reservoir pool and from rainfall. In certain regions, earthquake forces must also be added to these gravity and water forces.

Prior to the turn or the century and tor thirty some years after, earth dam side slopes were selected on the basis of past experience in lieu of a theoretical analysis. Justin, a noted authority on earth dam …

Vapor Liquid Equilibria Of The Isopropanol-Isopropylacetate-Water System, Amin Zavosh

Chemical and Biological Engineering ETDs

The separation of isopropylacetate from a ternary mixture of isopropanol, isopropylacetate and water by azeotropic distillation requires reliable and thermodynamically consistent vapor-liquid equilibrium data. By using a single experimental vapor-liquid equilibrium datum point for each of the related binaries of the above system, it is possible to determine the binary constants of some of the integrated forms of the Gibbs-Duhem equation such as the Van Laar or Margules equation. The binary constants can be used in the ternary forms of the above equations and in conjunction with the definition of activity coefficient to generate approximate vapor-liquid equilibrium data over 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

A Study Of The Supercooling Behavior Of High Purity Liquid Bismuth, B. L. Bramfitt

Doctoral Dissertations

"This investigation involves a study of the supercooling behavior of pure bismuth as affected by the melting atmosphere, the amount of superheat, and the intentional addition of metallic and non-metallic foreign materials to the melt. It was found that the amount of oxide on the melt surface is a controlling factor in the degree of supercooling obtainable in bismuth. In the presence of a thick bismuth oxide surface layer the amount of superheat below a 15°C drastically decreases the amount of supercooling due to the retention of nuclei in the surface film that promote nucleation upon cooling of the melt. …

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 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.

Decarboxylation Of Malonic Acid In Aqueous Solutions, Ramesh Natwarlal Gujarathi

Masters Theses

"The rate of decarboxylation of malonic acid in aqueous solutions was studied over a range of concentrations, pH's, and temperatures. The catalytic effect of various divalent metallic ions was also studied at a pH of 0.3. these studies did not support a truly unimolecular decomposition as the experimental order was found to be slightly greater than one. An empirical relation for the rate of decarboxylation was formulated in which the undissociated malonic acid and the monovalent malonate ion were the reactive species.

A possible mechanism of decarboxylation due to solvent activation was postulated. No pronounced catalytic effect due to the …

The Anodic Oxidation Of Maleic Acid, Larry D. Gilmartin

Masters Theses

"The purpose of this investigation was to determine the mechanism of the anodic oxidation of maleic acid on platinized-platinum electrodes at 80⁰C. Current density-potential studies were conducted varying the parameters of maleic acid concentration and pH. The faradaic efficiency of the oxidation of maleic acid to yield CO₂ was determined. The effect of temperature on current density was also studied to determine the activation energy for the reaction. The oxidation of maleic acid occurred only in acidic solutions. The faradaic efficiency was found to be approximately 97 ± 5 per cent. A linear Tafel region was found which had a …

A Study Of High Strength, Heat Treated Plain Carbon Steels, Ing Shing Chien

Masters Theses

"This work was undertaken as the initial step in a program of studying brittleness in carbon steel that has been heat treated to high strength levels.

The trend in modern technology is toward higher tensile strengths. In practice, only alloy steels are commonly heat treated to very high strength levels. AISI 4340 is one of the more commonly used steels when high strength is desired. It is also becoming almost standard practice to use some of the tool steels or highly alloyed maraging steels for high strength structural components.

For this study high strength in a heat treated steel is …