Digital Commons Network^™

Root Locus Plotter For A Dual Tank System Under Feedback Control, John M. Decatrel

Retrospective Theses and Dissertations

A root locus graphics routine was written in Turbo Pascal for the analysis and design of a linearized dual tank control system. The routine is a subprogram to be incorporated with an editor written by L. Fadden. This editor allows for the saving and changing of parameters to the system.

The dual tank system is a good example for classical feedback control analysis. A brief description of the process and system is presented. The system may be described by linearized differential and algebraic equations. From these, a characteristic equation is derived, which gives rise to the root locus. The root …

Control Of A Nonlinear System By Linearization, Drew D. Nelson

Retrospective Theses and Dissertations

In today’s linear control systems, exact solutions can be obtained by the use of Laplace Transforms in the frequency domain. In dealing with nonlinear systems, exact solutions are not always achievable. For this reason, it is necessary to linearize the system and then apply frequency response methods.

This paper shows the comparison of a nonlinear system with the linearized model of the same system. For both proportional and proportional-integral control, the response to a unit step change in the set point showed minimal difference between the linearized and nonlinear system.

The Relationship Between Class Activity Levels And Stated Attitudes Toward Physical Activity, Edwin Warner Kinney

Retrospective Theses and Dissertations

The purpose of this study was to examine the relationship of the class activity level to the stated attitude toward physical activity for community college students. The subjects for study were community college students enrolled in their first college level physical education classes. The activity level of each class was classified by the instructor as being either no aerobic activity, moderate aerobic activity or high aerobic activity. A modified version of Keynon's Attitude Toward Physical Activity was the instrument used as a pretest and again as a posttest at the end of the one-semester classes. The A.T.P.A. consists of 54 …

Multiplexing Phototransistor Arrays Using Transistor Capacitance, Gary E. Morrissette

Retrospective Theses and Dissertations

Photodetector Focal Plane Arrays are used in electronic image detection. This paper examines the multiplexer that converts the detected signals to a Time Division Multiplexed form. This paper will present two types of multiplexers, a traditional linear multiplexer and a matrix addressed multiplexer. These arrays will use the concept of charge storage to amplify the detected signal. The capacitance of the junctions of phototransistors are used for charge storage.

The Secant-Corrector Spectral Iterative Method For Analyzing Scattering From Planar Periodic Surfaces, Robert Middelveen

Retrospective Theses and Dissertations

The secant method is applied to an iterative algorithm of electromagnetic scattering from planar surfaces with periodic structure. The theory of convergent solutions for iterative techniques is discussed and examined. The Secant method is applied to the spectral iteration approach to accelerate and assure convergence of the basic iterative scheme. The derivation of the method as applied to surfaces containing parallel thin wire gratings is presented, and the conditions for achieving convergence are explored. This new method is also applied to gratings made of coated wires. The reflection characteristics of the grating as a function of wire spacing, wire conductivity, …

A Pool Boiling Map: Water On A Horizontal Surface At Atmospheric Pressure, O. Burr. Osborn

Retrospective Theses and Dissertations

The purpose of this study was to develop a boiling map for liquid water at an atmospheric pressure. The map indicates the type of pool boiling phenomenon will initially occur in terms of the bulk temperature of the liquid and the interfacial contact temperature. The geometry studied was that of a flat horizontal plate with boiling incipient from the upward facing surface.

Previous analytical and experimental studies have been conducted concerning pool boiling. Several of these studies are summarized in this thesis and it is seen that there are gaps and limitations in the existing state of knowledge. Therefore, further …

The Application Of Expert Systems To Automated Storage And Retrieval, Robert E. Mcdonald

Retrospective Theses and Dissertations

This report discusses the major functions, decisions, and strategies of automated storage and retrieval systems (AR/RS). The report surveys the essential features of expert systems and discusses how they can be applied in automated warehousing environments. A blackboard expert system architecture was examined and found to be a flexible and responsive control system for automated warehousing applications. A simple AR/RS expert system was constructed using an expert system software package. A warehousing simulation was performed which compared the expert system’s performance to a typical AR/RS control system. The expert system produced increased efficiency of operation because of the intelligent rules …

On-Line Microprocessor Control Of Optical Disc Recorders And Players, Howard Luebcke

Retrospective Theses and Dissertations

The goal of this paper is to document the work performed in the development of the software required to operate a video disc player and recorder in the on-line mode using a portable computer. Applications of video disc systems are discussed as are future improvements to the developed system.

This paper also includes a description of the hardware, functional requirements and design of the software, and the end result of the development of the software in the form of program listings.

Electromagnetic Scattering From Stacked Gratings, Pok K. Kwan

Retrospective Theses and Dissertations

The theory of scattering matrices and microwave network analysis are employed to solve the problem of scattering from cascaded infinite periodic gratings. The total reflection and transmission coefficients are calculated as functions of angle of incidence, wire spacing for each grating, grating separation, wire thickness, and number of gratings that comprise the cascaded structure. Moreover, the problem of stacking dielectric slabs with periodic gratings is formulated and solved. In all cases, the Secant Corrector Spectral Iteration approach is used as a numerical method for calculating the desired currents and fields.

Finally, calculated values of the reflection and transmission coefficients are …

Relationship Of Shift Work Schedules And Job Satisfaction Of Female Nurses, Maurie L. Antrim

Retrospective Theses and Dissertations

The purpose of the study was to identify variables which are related to job satisfaction, focusing on shift schedules and their impact on life activities outside the work setting. The sample consisted of 72 female nurses. The subjects received questionnaires which contained questions relating to biographical information (age, gender, marital status, number and ages of children, length of time on the job), work schedule information (shift worked, number of weekends and holidays worked), and satisfaction information (shift schedule satisfaction, satisfaction with amount of weekend work, satisfaction with days worked/days off schedule, and satisfaction with amount of time for family, friends, …

Pulse Width Modulated Adaptive Delta Modem Design And Analysis, Gregory L. Milne

Retrospective Theses and Dissertations

A unique design of a voiceband adaptive delta modem will be presented. The modulator utilizes a constant amplitude variable width pulse combined with the principles of delta modulation. This results in a modem that has lower amplitude distortion, requires less transmission channel bandwidth, and is less prone to slope overload than conventional adaptive delta modems. The design also allows the use of a simple single integration demodulator while maintaining fidelity.

The modem design and analysis is presented assuming a transmission channel which is bandwidth limited and amplitude limited.

Dynamic Systems Analysis Of A Vehicle Suspension System, Bruce M. Skeldon

Retrospective Theses and Dissertations

This research report deals with one system in a Computer Aided Instruction package in the Dynamic Systems and Control Theory fields for the college undergraduate students. It uses the computer to numerically solve the two degree of freedom equations of motion for a vehicle suspension system. Numerical solutions to the system differential equations are used to drive an animated display of the vehicle’s motion (vertical displacement and rotation about the center of gravity) on the video display terminal.

Charrette Conference The Potential For Developing Theme Park Residuals From Expo 86 In Vancouver, Harrison Price Company

Harrison "Buzz" Price Papers

Harrison Price Company (HPC) was retained by IBI Group on behalf of the Ministry of Land, Parks, and Housing of the Province of British Columbia in January 1986 to organize and carry out a charrette conference directed at determining the potentials for a major themed amusement attraction in the Vancouver area and the degree to which the availability of certain residual equipment, facilities and other values in Expo 86 can stimulate the creation of such a project.

Fibergramme Vol.10 No. 4, Weavers Of Orlando

Text Materials of Central Florida

FIBERGRAMME is published in September, November, January, March and May.

The Stress-Buffering Role Of Social Report And Self-Efficiency Among First-Year Graduate Students, Mary T. Cecchini

Retrospective Theses and Dissertations

No abstract provided.

Attitude Similarity, Expertness And Perceived Counselor Trustworthiness, Sharon Lee Mckay

Retrospective Theses and Dissertations

This analogue study investigated the relationship between the "therapeugenic" (Bloom & Trautt, 1978) factors of attitude similarity and expertness on perceived trustworthiness of a confederate counselor. Several investigators have demonstrated that attitude similarity is positively related to perceived attractiveness, likeability and competence of counselors (Good, 1975; Griffitt & Byrne, 1970; Trautt, Finer & Calisher, 1980). There has been mixed support, however, for the notion that counselors who are perceived as "expert" will positively impact the counseling relationship (Brischetto & Merluzzi, 1981; Kunin & Rodin, 1982; Strong & Schmidt, 1970). The present study expanded previous research by jointly manipulating attitude similarity …

Effects Of Cognitive And Modeling Techniques On Pain Management In Abortion Patients, Sue Mclendon

Retrospective Theses and Dissertations

Four short-term interventions (relaxation instructions, cognitive imagery instructions, cognitive modeling, and vicarious modeling) were experienced by 105 first-trimester abortion patients, to determine their effects on abortion pain and self-efficacy in handling abortion pain, as measured by self-report. No significant differences were found among treatment group and controls. In fact, no significant increases were found among groups in the time the patients spent engaging in activities suggested by instructions.

However, abortion patients were found to show significant differences in abortion pain and distress by whether they had experienced natural childbirth training. Also, a sensitivity to staff attitudes was revealed by the …

Comparable Worth: Gender Bias In Salary Administration, Delora Mcdaniel

Retrospective Theses and Dissertations

Comparable worth, an idea that is playing an increasingly important role in the wage and compensation issues of the 1980s, is examined in a controlled classroom setting. Salary as a function of rater gender and job stereotyping (as measured on a ranked order) was examined using undergraduate student subjects. Seven position descriptions from a savings and loan association were subjectively evaluated. The subjects assigned salaries, rank ordered the positions on a male to female (male=l, female=?) continuum and completed an Attitude toward Women Scale (AWS). Modest support was found for the hypothesis that salary would be a function of rater …

The Relationship Between Role Conflict And Ambiguity And Types Of Communication Moderated By Organization Level, Charles A. Olsson

Retrospective Theses and Dissertations

No abstract provided.

Gatekeepers And Their Role In The Selection Of Press Releases, Martha L. Nixon

Retrospective Theses and Dissertations

No abstract provided.

Marital Satisfaction As A Function Of Gender, Own Rationality And Spouse's Rationality, Gabrielle T. Vincent

Retrospective Theses and Dissertations

No abstract provided.

Metalinguistic Tasks For Adolescent Children, Mary D. Griffin

Retrospective Theses and Dissertations

No abstract provided.

An Investigation Of Career Development By Community College And University Women : Importance Of Contributors To Advancement Into Higher Education Administration, Lynda A. Kuyper

Retrospective Theses and Dissertations

Surveys of women in higher education administrative positions that identified factors which may contribute to career development have been conducted. However, the literature revealed little information regarding the importance placed on those factors by women in higher education administrative positions. The purpose of this study was to determine the importance of selected contributors to career development of women in higher education administration. Data were gathered by a mailed questionnaire to a sample of women administrators employed in Florida state supported community colleges and universities. The 343 useable returned questionnaires represented a 65.5% response rate and 51.3% of the total population. …

The Integration Of Computer Graphics With Video Disc Technology: An Application In Training, Fereidon Torkzadeh

Retrospective Theses and Dissertations

The major objective of the work outlined in this paper is to become familiar with the MOVIE.BYU graphic system from Brigham Young University to demonstrate its use in the generation of non real-time images for a typical pilot training application. The implementation is done by using the MOVIE.BYU graphics system, a VAX 11/750 digital computer, and RAMTEK 9460 system. This paper discusses how the images can be stored a frame at a time on a video disc for playback at the normal rate to portray a moving scene using a Panasonic video disc recorder and player, and a Sony video …

A Theoretical Evaluation Of Water Surface Changes In A Circular Reservoir, Hossein G. Tehrani

Retrospective Theses and Dissertations

The purpose of this project is primarily to develop an equation to estimate the time that it will take for the water surface to decrease to another depth in an inverted conical-shaped reservoir behind an earth dam by means of the falling head permeability concept. This equation can be applied to the earth embankment either with or without underdrain. Since the derived equation for time span is a complicated and tedious matter, a computer program has been developed for solving this equation.

The computer program is written in BASIC language and executed on a Tektronix 4051 microcomputer. Primary effort has …

The Effect Of Detention Period On The Clarification Efficiency Of Nitrified Activated Sludge, James C. Boyd

Retrospective Theses and Dissertations

Proper performance of the final clarifier in the activated sludge process is vital to total system efficiency. Inadequate clarification can adversely affect substrate removal efficiency due to the biochemical oxygen demand exerted by solids lost in the clarifier effluent. Detention period is one factor which influences clarification performance and thus is of interest to the designer engineer. Also of interest is the relationship between detention period and rising sludge conditions in the clarifier, which can lead to a deterioration in clarification efficiency. Rising Sludge conditions are believed to be caused by the denitrification of nitrified activated sludge in the final …

Phase-Locked Loop Based Oscillator Phase Noise Measurement Technique, Luis M. Jimenez

Retrospective Theses and Dissertations

Oscillators play an important role in the performance of various radio frequency (RF) systems. The generation of stable carrier and clock frequencies is necessary at both the transmitter and receiver ends of a communication system. Phase noise is the parameter used to characterize an oscillator frequency stability. This thesis introduces a phase noise measurement technique using a phase-locked loop. A 100 MHz Colpitt’s oscillator, for the phase noise source, was designed and built. The output of the oscillator was mixed down to 10 MHz, before a phase-locked loop extracted the phase noise information. Measurements were taken at RF frequencies using …

Optimizing Scanning Mirror System Performance Using Solid State Piezoelectric Actuators, Thomas J. Tomasetti

Retrospective Theses and Dissertations

The purpose of this thesis is to design a scanning mirror system using piezoelectric actuators. A dual-cantilevered bimorph electromechanical coupling is presented, which maximizes the amount of angular deflection possible with an applied field. Two types of feedback methods are employed: rate sensing, which provides resonance damping, and position sensing for increased bandwidth and decreased hysteresis. A prototype system, including the actuator and feedback mechanisms, is developed. Its performance compares favorably with its model and is capable of plus and minus five degrees of angular deflection with a bandwidth of 300 Hertz.

Preparation And Preparedness: A Study Of Curriculum Design In Terminal Master's Programs In Industrial/Organizational Psychology, Cynthia K. Rubin

Retrospective Theses and Dissertations

Graduate programs in Industrial/Organizational Psychology vary throughout the country with regard to curriculum design and content, raising the issue of preparation and its relationship to preparedness on the job. It was hypothesized that: (1) students with a greater amount of prior field experience would perceive themselves to be better prepared for the workplace than those with a lesser amount of such experience; (2) employers would perceive students who had received a greater amount of prior field experience as better preared than those with a lesser amount of such experience; and (3) students with previous work experience or job training in …

The Assessment And Treatment Of The Premenstrual Syndrome Client, Alison W. Kolodinsky

Retrospective Theses and Dissertations

Over 21 million American women suffer from the chronic, cyclic psychoneuroendocrinological dysfunction known as premenstrual syndrome (PMS) (Greenfield & Wolf, 1983). At least five million of these women suffer from symptoms so debilitating that their personal and/or professional lives are disrupted (Labrum, 1983). Women who suffer from PMS often seek counseling because of the syndrome's behavioral, affective, and emotional components. Mental health professionals must be prepared to aid both the client and her gynecologist in the diagnosis and treatment of PMS. This research report includes (1) a synopsis of the medical literature including some of the theories of etiology and …