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Compensator Design For Unity Feedback Systems Using An Analytical Method, Chang-Yu Wu

Masters Theses

“In control systems engineering it is frequently necessary to compensate a fixed plant whose transfer function cannot be changed. Usually the characteristics of the resulting system are established in terms of steady-state and transient performance specifications. Generally it is necessary to insert a compensator which insures stability as well as satisfies the specifications.

In this thesis an analytical method is developed to determine the transfer function of the compensator in order to satisfy the following set of specifications. The fixed system is assumed to contain one non-linearity, saturation. The input to the saturable device is constrained in a statistical …

The Effect Of Matrix Condition In The Solution Of A System Of Linear Algebraic Equations., Herbert R. Alcorn

Masters Theses

"The solution of a system of linear non-homogeneous equations may contain errors which originate from many sources. A system of linear equations in which small changes in the coefficients cause large changes in the solution is unstable and the coefficient matrix is ill- conditioned .

The purpose of this study is to define several measures of matrix condition and to test them by correlation with a measure of the actual errors introduced into a system of equations.

The study indicates that three of the five measures of condition tested were reliable indices of the magnitude of error to expect in …

Experimental Evaluation Of Thermal Stresses On The Outer Surface Of A Thick-Walled Tube., Vinodray T. Patel

Masters Theses

"In this investigation an attempt has been made to measure thermal stresses on the outer surface of a thick- walled tube. The inside surface was heated by steam passing through the tube while the outer surface was cooled by water. Two temperature compensated strain gages were used to measure strains in the tangential and axial directions respectively. The advantage of using this type of strain gage is to avoid the use of a dummy gage to compensate for the temperature effect.

The analytical solution to the problem was derived and the values of thermal stresses were calculated theoretically and compared …

The Anodic Dissolution Of Zinc In Nitrate Solution., Jo Lisle Reed

Masters Theses

"The increasing demand for protective metals as coatings and non-corrosive alloys has stimulated extensive research on the fundamental behavior of metals in corrosive media.

One of the problems still unsolved is the nature of the mechanism of the anodic dissolution of metals like zinc, magnesium, beryllium, cadmium, and aluminum in aqueous salt solutions. Several schools of investigators have proposed different and opposing theories to explain the discrepancies which often arise between coulometric data and the weight loss of metal electrodes in certain salt solutions.

The purpose of this investigation was to obtain experimental data for the anodic dissolution of zinc …

A Study Of Rotational Critical Speeds For A Multi-Mass System By Influence Coefficients, Kantikumar G. Patel

Masters Theses

"In this investigation an attempt has been made to determine the critical speeds of a multi-mass rotational system by using influence coefficients. Modes of vibrations are also examined at these critical speeds.

A shaft carrying five masses, supported by bearings at the ends, has been studied analytically. The length of the bearings is considered small with respect to the shaft length and therefore, the configuration is assumed to be point supported as a simple beam. The five masses, each weighing one pound, were placed at equal distances of 10 inches on a 60 inch shaft. The critical speed was examined …

Minimum Frictional Characteristics Of Optimum Journal Bearings., Navinchandra F. Shah

Masters Theses

"This investigation was conducted to develop a graphical representation to determine the optimum bearing conditions for minimum friction and to establish a theoretical approach for journal bearing design.

A series of graphs has been plotted for· the coefficient of friction versus the eccentricity ratio based on the. Sommerfeld number derived from Reynolds' differential equation, f or optimum journal bearings.

The results obtained in this research have been compared with those developed by other investigators. This comparison confirms the validity of the results presented in this thesis, so that it could be used advantageously for the design of optimum journal bearings"-- …

Learning Set Formation In The Guinea Pig, Paul E. Burk

Masters Theses

No abstract provided.

A Study Of Time Management – By A Selected Group Of Employed Homemakers, Patricia M. Skrocki

Masters Theses

Chapter I

The Problem and Definition of Terms Used

During recent years there has been a steady increase in the number of homemakers employed full-time outside their homes. When a homemaker resumes dual responsibilities she is faced with an increased need to manage her time well in order to meet the family needs as mother, wife, and homemaker plus meeting the employers expectations of an employee. There has been much speculation concerning time management by these employed homemakers, but there was very little available research on this areas of management.

The Problem

Statement of the Problem. The purpose of this …

A Study Of Verbal Output, Relating To Otsego Public School First Grade Students With Functional Articulatory Defects, John M. Bartholomy

Masters Theses

The Problem and Its Background

The Problem

The purpose of this study is to determine whether or not the verbal output of first grade elementary school children is reduced when one of the participants in conversational communication has an articulation speech defect. A speech defect has long been thought to cause a reduction in the verbal output of the possessor of that speech defect. This present study seeks to determine whether or not an articulatory speech defect also reduces the verbal output of the normal speaking person with whom he is communicating.

Labor Turnover As A Factor In Personnel Evaluation, James D. Taylor

Masters Theses

Abstract

Management needs to know how it is doing in the field of personnel management, just as it does in the area of financial management. In order to determine this, an evaluation of the personnel program is necessary. When completed, such an evaluation provides management with the information necessary to effectively plan and budget the personnel program.

The personnel audit audit has been used as a means of evaluating the personnel program. The audit can cover all of the various aspects of the personnel program or it can be restricted to only one of the personnel functions. In the past …

Absent Fathers And Problem Behavior, A Comparison Of Children From Broken And Unbroken Homes, Earl Walter Morris

Masters Theses

Introduction

This study is an attempt to explore several aspects of the influence of the family upon the occurrence of problem behavior among children.¹ Essentially it deals with a comparison of the occurrence of problem behavior among two groups of children: (1) children in the homes where the father is absent because of death, divorce, separation or desertion; and (2) children in homes where both parents are present.

In the past the "broken home" has received a great deal of attention is delinquency research. The physical presence of absence of a parent has not been found to be highly …

The Teaching Of Succession Through The Use Of Pond Infusion Cultures, James E. Cole

Masters Theses

Chapter I

Introduction

The approach to teaching biology for general education is significant. In a course of this nature, the learning of biological principles should be of primary concern. It is hoped that such principles then will lend themselves to the understanding and use of the scientific approach to everyday happenings. To do this, however, requires that the teacher use the inductive method for developing an understanding of the principles, and the deductive method for applying them.

Planners of these basic biology courses attempt to define areas of real concern and interest to students. Having defined these areas, the planners …

The Road To Murfreesboro: The Eleventh Michigan Volunteer Infantry From Organization Through Its First Battle, Wayne C. Mann

Masters Theses

Introduction

This is a history of the Eleventh Michigan Volunteer Infantry. It was never a famous regiment; it never did much out of the ordinary, and participated in few major battles. If three is anything to distinguish this regiment, it is that it is not distinguished. What happened to the Eleventh Michigan happened to countless other regiments both North and South. In a sense a study of one regiment provides a study of all.

The Eleventh tried to be different. It almost caught John Hunt Morgan in Kentucky. At Murfreesboro it made a desperate charge to retake the Cedars. It …

Areas Of Knowledge And Skills Essential To Occupational Therapists In Clinical Psychiatry --A Critical Study Of 395 Performance Examples, Elizabeth A. Boles

Masters Theses

Introduction

Occupational therapy, an allied medical discipline, has experienced rapid growth in the slightly more than forty years of its existence. The impetus given to this field through the training of World War I reconstruction aides, the forerunners of professional occupational therapists, has been described by Willard and Spackman.¹ These authors state that the inauguration of the first collegiate training program took place at Milwaukee Downer College in 1913. By 1921 a national professional organization had been formed,² and by 1938 four schools of occupational therapy had been accredited, based on standards set up by the American Medical …

United We Serve Relief Efforts Of The Women Of New York City During The Civil War, Phyllis Korzilius

Masters Theses

Preface

In high school and college most of my study in the Civil War period centered in the great battles, generals, political figures, and national events that marked the American scene between 1861 and 1865. Because the courses were of a broad survey type, it would have been presumptuous to expect any special attention to such issues as the role of women in the war. However, a probe of the more common or personal aspects of the "era of conflict" provides a deeper insight of the era as well as more knowledge. For this reason I have examined the work …

Identifying Students In The Junior High School Who Have Emotional, Social, Or Educational Handicaps, Ralph J. Ankenbrand

Masters Theses

No abstract provided.

A Study Of The Responses Given By Drop-Outs To The Drop-Out Questionnaire, And The Scale Question Form Used In The Project "Operation Second String High School Drop-Outs In Mattoon, Illinois", Alan D. Adamson

Masters Theses

No abstract provided.

The Influence Of John Ellis On Education In Illinois, Shirley Nelson Rawls

Masters Theses

No abstract provided by author.

Thermocouple Shape Influence On Response In A Dynamic Compressible Fluid Atmosphere, Philip J. Steger

Masters Theses

"This investigation was performed to determine whether the geometrical shape of a thermocouple used to measure the temperature of a dynamic fluid atmosphere had any affect on its recovery factor and time response.

A converging nozzle was used to establish a dynamic fluid stream in which shaped silver solder junctions of copper-constantan thermocouples were tested. The velocity of the working fluid, air, was about 1000 ft/sec at the test point.

The investigation was successful, within experimental limits, in determining that the recovery factor of a bare thermocouple junction is not influenced by geometrical shape The results agreed substantially with available …

An Investigation Of The Acceleration Of Neutrons, Charles Edward Byvik

Masters Theses

"The acceleration of neutrons via their magnetic dipole moment in an axially symmetric magnetic field is considered. Conditions for bunching are derived and expressions for the off-axis forces are developed. It was found that neutrons off axis are forced back onto the axis and that neutrons slightly depolarized remain in their initial state. A calculation of the acceleration is made using the field of a current loop and the conclusion is that under present laboratory capabilities a neutron accelerator is not feasible"--Abstract, page ii.

A Study Of A Method For Determining Properties Of Metals At High Strain Rates., Warren Heidbreder

Masters Theses

"An experimental method has been developed for determining the tensile and other physical properties of metals under high loading rates. Experimental equipment was designed, fabricated and tested. It was desirable to keep the equipment simple and inexpensive so that it could be used by operators Lacking experience in electronics and high-speed photography which are required for some of the more sophisticated methods now in use. The energy for pulling the specimens is supplied by smokeless gun powder. The firing of a cartridge into a closed cylinder with movable piston accomplishes the breaking of the specimen. A record of the time, …

The Performance Of A Mechanically-Aided Countercurrent Extraction Column., Jerry James Carr

Masters Theses

"In recent years liquid extraction has become a major industrial method for the separation of liquid solutions. Liquid extraction has proven successful in some separations performed only with great difficulty by other, more common mass-transfer operations. Th e industrial utilization of liquid extraction has resulted in considerable interest in the design and performance correlations of high-capacity, high-efficiency extraction equipment.

Continuous countercurrent columns, filled with various packings, baffles, and plates, have been found to be relatively ineffective in liquid extract on service. The density difference of the contacted phases is generally insufficient to, by itself, cause the intimate contact necessary for …

A Study Of Methods For Determining Confidence Intervals For The Mean Of A Normal Distribution With Unknown Varience By Comparison Of Average Lengths, Karl Richard Kneile

Masters Theses

“The purpose of this thesis is to briefly review various properties which may be desirable for a system of confidence intervals; and to empirically determine whether the system of confidence intervals obtained from the Student’s t distribution will produce shorter average lengths than those obtained by other methods which may be used. It was concluded from the results of an empirical investigation that there was no significant difference between the average lengths of confidence intervals obtained from a family of distributions of which the Student’s t is a member"--Abstract, page ii.

Hydraulic Transportation Of Coal In Open Flumes., Nallapu Narayan Reddy

Masters Theses

"The objective of this study is to design a simplified form of hydraulic transportation system using open-flumes and operated by gravity in pitching coal seams. This type of system is to be used in conjunction with mining by hydraulic methods where the water used for the extraction of coal can also be used for the loading and transport functions"--Introduction p. 1

Determining Stability Of Nonlinear Control Systems Via Lyapunov's Method., John Joseph Komo

Masters Theses

"The problem undertaken in this thesis is to present Lyapunov's method of stability as i t applies to control systems and to use it in the stability analysis of nonlinear control systems. The variable gradient method of generating Lyapunov functions is presented since this seems the best general procedure for obtaining Lyapunov functions. Also, the integration of matrices method is presented as a comparison. ii

Procedures for the use of the variable gradient method and the integration of matrices method are written and several examples are used to illustrate these procedures.

It is concluded that Lyapunov's method is very definitely …

Swelling Properties Of Putnam Soil, Oscar M. Palma

Masters Theses

"Volume change of Putnam soil under different moisture contents and the swelling pressure developed by the soil at the same moisture contents were investigated using standard test procedures.

The theory of one dimensional consolidation of Terzaghi was reviewed as well as the literature on swelling and swell pressure.

It was found that swell depends mainly on the initial water content, while swelling pressure depends mainly on the dry density of the soil"--Abstract, page ii.

Liquid Mercury Embrittlement Of Thin-Walled 2024 Aluminum Tubes, Edward J. Beckemeyer

Masters Theses

"The dislocation theory, Zener-Stroh crack model, and the Petch relationship, which correlates fracture stress and grain size, were used to analyze the embrittlement of 2024 aluminum alloy tubes by liquid mercury.

Surface energy ratios, [formula], were determined for biaxial stress ratios of 1/2, 1, ∞. The values of the surface energy ratios considered were 4.24, 1.79, 1.46, respectively. As part of this study, an approximate Nabarro-Peierls frictional stress was calculated for each stress ratio"--Abstract, page 2.

Infrared Modulation Using The Field-Effect Properties Of Germanium., Lloyd E. Brunkhorst

Masters Theses

"The absorption of infrared radiation, by free carriers in germanium, has been used to amplitude modulate infrared radiation. In the experiment, a space charge layer consisting of free carriers is established at the inner surface of a germanium sample by using the field-effect technique. Infrared radiation of a wavelength to which the germanium is transparent is then Internally reflected from this surface. The infrared radiation passes twice through the space charge layer for each internal reflection. With each pass through the space charge layer, the amplitude of the transmitted infrared is decreased. Amplitude modulation of the transmitted infrared is accomplished …

Derivation Of A Method To Determine Reactions And Deflection Of A Continous Beam On An Elastic Foundation, Louis Richard Fuka

Masters Theses

“The purpose of this thesis is to develop a method for determining the reactions and deflection curve of continuous beams partially supported by an elastic foundation. The method involves representation of an arbitrary loading and the intermediate redundant reactions as Fourier Series. Redundant intermediate reactions are determined by the solution of an equal number of linear equations. The remaining reactions are determined by the application of statics.

This same method can be used for simply supported beams on an elastic foundation and for continuous beams without an elastic foundation”--Abstract, page ii.

A Numerical Approach To A Sturm-Liouville Type Problem With Variable Coefficients And Its Application To Heat Transfer And Temperature Prediction In The Lower Atmosphere., Troyce Don Jones

Masters Theses

No abstract provided.