Digital Commons Network^™

Reactions Of Chlorocarbon Species With Hydrogen Over Palladium On Alumina Catalyst And Zeolite Catalyst-Development Of Deactivation Models, Yuh-Der Yang

Dissertations

Four catalytic dechlorination reactions were studied experimentally using a fixed-bed reactor at atmosphere pressure. Reaction mechanisms were proposed, and the kinetics modelled.

The first reaction is 1,2-dichloroethane with hydrogen over zeolite catalyst. Catalyst deactivation models were examined.

The second reaction was between 1,2-dichloroethane and hydrogen over palladium catalyst on alumina support. Formation of two intermediates on the catalyst surface is proposed, which then produced ethane, ethylene, and ethyl chloride. Higher conversion to ethane and ethylene was observed at temperatures above 218°C while conversion to chloroethane is higher at temperatures below 218°C. The activation energy was found to be 15 Kcal/gm-mole. …

Deposition Of Particles In Tubes Due To Gravity And Electrostatic Charges, Win-Chung Chen

Dissertations

The deposition of particles in a parallel-plate channel and a circular tube under the influence of inertia, fluid viscosity, gravity and electrostatic image forces was studied by analytical and numerical methods. A laminar flow with uniform and parabolic velocity profiles was investigated with a particle initial velocity of zero as well as that of the local fluid velocity.

The governing equations were solved by the Lagrangian approach to obtain the particle trajectories from which the fraction of deposition was calculated. Closed form solutions for particle trajectory and a complete deposition of particles in a finite length of the flow passage …

Computer Aided Stress Analysis Of Long Bones Utilizing Computed Tomography, Shlomo Asher Marom

Dissertations

A computer aided analysis method, utilizing computed tomography (CT) has been developed, which together with a finite element program determines the stress-displacement pattern in a long bone section. The CT data file provides the geometry, the density and the material properties for the generated finite element model.

A three-dimensional finite element model of a tibial shaft is automatically generated from the CT file by a pre-processing procedure for a finite element program. The developed pre-processor includes an edge detection algorithm which determines the boundaries of the reconstructed cross-sectional images of the scanned bone. A mesh generation procedure then automatically generates …

Two And Three-Dimensional Isoparametric Finite Elements For Axisymmetric Micropolar Elasticity, Fuang-Yuan Huang

Dissertations

Finite element analysis program for isotropic and orthotropic axisymmetric micropolar (Cosserat) elastic solids are developed in this thesis. Isoparametric elements of 8- and 20- node are used to solve general three-dimensional problems, arid both 4- and 8-node elements are used for two-dimensional cases. Three-dimensional finite element formulation for cylindrical coordinate system is derived. Corresponding Fortran programs are then developed. Patch tests are performed for two-dimensional cases to verify the applicability of the finite element method to non-rectangular geometries. Several two-dimensional and three- dimensional problems for micropolar elastic solids are solved to verify the formulations arid computer program.

Good agreements were …

The Relationship Between Marital Satisfaction And Jungian Psychological Type, Lawrence Brad Beer

Dissertations

Researchers investigating the relationship between marital satisfaction and psychological type have discovered indications of a clinically useful relationship. By further clarifying the relationship between these two variables, guidelines may be established which can be helpful to counselors conducting marital therapy and marital enrichment programs. A secondary purpose of the investigation was to assess the relationship between selected demographic variables and marital satisfaction.

Married subjects were randomly selected from two groups--La Maz class participants and students from a local community college. Subjects responded to three self-report instruments--the Marital Satisfaction Inventory (MSI), the Myers-Briggs Type Indicator (MBTI), and a Personal Information Questionnaire …

The Study Of Retention And Leadership: A Process Model Of Turnover, William P. Shine Edd

Dissertations

The purpose of this research was to examine the effect on retention due to the involvement, interaction, and initiatives of leaders. As an ethnographic case study it contrasted the leadership behaviors of three chief executive officers of a medium sized electronics firm. Several conceptual models from the literature were compared and evaluated in order to construct a model of the turnover process with leadership as one of the contributory variable. Extensive use was made of biographic data, archives, interviews, and surveys of present and former employees. Individuals throughout the organization and the chief executive officers were personally interviewed. Leadership initiatives …

The Psychosocial Variables In Accidents: A Process Model, Denise Diazadji Guastello

Dissertations

No abstract provided.

Interdisciplinary Research Methodology For Secondary Level Social Studies: A Teaching Unit Concerning The Holy Shroud Of Turin, Melinda K. Blade Edd

Dissertations

In the past decade, numerous educational leaders have been critical of the quality of achievement of the educational system of the United States. Declining scores on standardized tests and the Scholastic Aptitude Test, illiteracy and the inequality of educational opportunities for America's youth were a few of the concerns documented by educational leaders. In an effort to correct some of the existing problems, reform measures have been delineated by various commissions and educational authorities. The use of interdisciplinary curriculum, particularly in Social Studies, was among the suggestions for improving the quality of education. The purpose of this study was to …

Leader Communication And Organizational Culture: A Field Study, Shay Sayre Edd

Dissertations

Corporate culture, the object of considerable media attention since 1980, has been identified as an important consideration for improving performance. While the literature points to vision as a key element for building a productive culture, it does not sufficiently address the communication process used by leaders to transmit their vision. This research looks at the leadership and communication aspects of culture, exploring the extent to which the leader's ideology influences the behaviors of organization members. Conducted in a $30 million Southern California company of 225 employees, the study focuses on a female general manager who, in the founder's absence, has …

A Validation Study For Comparison Of Safety Climate Perceptions Of Safe And Unsafe Workers, Harold J. Holmes

Dissertations

No abstract provided.

The Relationships Between School District Characteristics And Microcomputer Use, Theodore L. Sanders

Dissertations

No abstract provided.

The Arabs In Israel: A National Minority And Cheap Labor Force, A Split Labor Market Analysis, Samir M. Miari

Dissertations

No abstract provided.

A Study Of The Background Characteristics, Current Lifestyles, And Career Patterns Of High Achieving Women, Gahan Ann Jacobs

Dissertations

No abstract provided.

A Study Of The Relationship Between Personality Traits As Measured By Cattel’S 16 Personality Factors And Aspirations For Leadership, Diane Pressel

Dissertations

No abstract provided.

The Clinical Appraisal Method Of Evaluating Candidates For Management Positions: A Construct Validity Study, Loretta Postillion Van Der Plas

Dissertations

No abstract provided.

Human Factors In Computerized Medical Systems, Carol L. Curt

Dissertations

No abstract provided.

An Industrial Ethanol Azeotropic Distillation Process : Modeling, Analysis, And Simulation, Harpreet Singh Chawla

Dissertations

A steady state process simulator with extensive capabilities was developed for the simulation of process plants involving non-ideal multicomponent systems. A comprehensive stand alone program was developed to represent process systems encountering three phases. A computer program was also developed to handle simultaneous regression of vapor-liquid and liquid-liquid equilibria data to estimate the liquid phase activity coefficients via a global set of parameters for the ethanol azeotropic distillation process, using benzene as the entrainer.

An industrial ethanol azeotropic distillation process has been simulated using the developed process simulator (PROSIM). A study of the azeotropic column's aqueous ethanol feed composition reveals …

The Effect Of Single Electrolytes On The Vapor-Liquid Equilibrium Of Mixed Solvents, Peggy Tomasula

Dissertations

A group-contribution model for the prediction of salt-effects on the vapor-liquid equilibria of multicomponent electrolytic solutions containing a single electrolyte is presented. Coulombic interactions are represented through a Pitzer term. Solvation effects and short-range interactions are represented through a UNIQUAC-type expression. An ion-size, a solvation and three ion-solvent interaction parameters per salt-solvent binary are required for multicomponent predictions.

All parameters are obtained only through the correlation of binary salt-solvent osmotic coefficient and vapor-pressure depression data at 25°C, in most cases, and binary solvent VLE data. The salt-solvent binary data were correlated with an average percent error in CD of 2.5 …

Ternary Ion Exchange In Fixed Beds : Equilibrium And Dynamics, David W. H. Roth

Dissertations

A model was developed to simulate ion exchange within fixed beds for ternary systems. Models of the fluid phase material balance, phase equilibria, and diffusion of ions through the film and within the resin phase incorporated the latest advances in ion exchange theory. The separate model elements were combined after testing into an overall general model. Non-linear regression support programs were developed to estimate equilibrium parameters and resin phase diffusion coefficients.

A computer program was developed to estimate axial dispersion coefficients from experimental data. General correlations derived from literature sources were tested, and axial dispersion terms were included in the …

Differences In Typology Among Nurses At Different Levels Of Management In Acute Care Institutions As Measured By The Mbti, Catherine Marie Devet

Dissertations

This survey research study explored differences in personality types between staff nurses and nurse managers in acute care institutions (hospitals). The study tested a theory about expected differences which was based on an extensive literature review of nursing administration and type theory as developed by Jung and measured by the Myers-Briggs Type Indicator (MBTI).

Eight acute care institutions were selected randomly from hospitals listed by the American Hospital Association (1983) as having 400-600 beds and located in the state of Michigan but outside of Wayne County. Of the eight hospitals approached, permission to conduct the study was obtained in five. …

The Relationship Between Nonsupervisory Employees' Self-Assessment Of Their Supervisory Skills And The Amount Of Satisfaction They Believe They Would Receive From Being A Supervisor, Arthur W. Hoffman

Dissertations

This descriptive study investigated the relationship between perceived supervisory effectiveness (competence) and perceived supervisory satisfaction for nonsupervisory professional-technical employees who may aspire to supervisory positions. The study participants are employees of a large industrial company engaged in the engineering and manufacturing of diversified products for the automotive industry. Specifically, the study attempted to (a) collect employee selfassessment data regarding the employee's perceived supervisory job effectiveness and perceived job satisfaction, (b) determine whether a relationship existed between perceived supervisory effectiveness and satisfaction, and (c) determine if the employee's age and educational level were influencing factors.

In order to investigate the relationship …

Investigation Of Pre-Detection Signal Processing Of Pseudonoise Communication Signals In The Presence Of Additive White Gaussian Noise And Cw And Bursty Interference, Israel Mayk

Dissertations

By comparison to conventional communication systems, spread-spectrum systems are known to be less affected by interference because of their large dimensionality in signal space. Nevertheless, significant performance degradation is experienced when large interference exists in a few or even one signal coordinates. In this case, interference reduction techniques are also known to provide additional processing gain. A novel class of pseudonoise (PN) invariant algorithms is derived to reduce the impact of interference and restore much of the structure of PN signals received in the presence of interference and noise. A PN signal received by a pre-detection signal process (PDSP) implementing …

Peer Influence: A Method To Help Manage Stress, Ronald Cameron Zurcher

Dissertations

Purpose: The purpose of this project was to find a difference between middle managers’ and blue-collar workers’ episodic non-work related and work related stress events. The information that was found was to be developed into a “peer influence” program to help prevent the workers from experiencing chronic stress symptoms.

Method: From research it was determined that there is a significant difference between middle managers’ and blue-collar workers’ episodic non-work and work related stress events. The material that was reviewed showed a difference in five areas: threat of job loss, lack of authority, new social values (sociability), personal life (satisfaction), and …

Kinetic Modeling Of A Laminar-Flow Reactor, Shih-Hsin Chang

Dissertations

The laminar-flow reactor considering radial dispersion for a species incurring first-order homogeneous (bulk) and heterogeneous (wall) chemical reactions was mathematically modeled. The equation was solved both analytically, and by the Crank-Nicolson finite-difference technique.

The response surface method was used to obtain the optimum values of the two rate constants. The optimum values interact because the wall and bulk reactions proceed in parallel. Varied reactor diameters serve to decouple the bulk and wall reactions to locate the true values of the rate constants.

Four dimensionless variables were defined and used to characterize the reacting system. In addition, their values were shown …

The Effect Of A Higher Order Pole On The Optimum Design Of Minimum Threshold Phase Locked Detectors, Bernard Zivotofsky

Dissertations

The phase lockedloop is widely used as an FM demodulator known as a phaselocked detector (PLD). It is particularly useful in the detection of weak signals because lower threshold is possible with a PLD than with a conventional limiter discriminator. An enhanced version PLD known as an extended range phaselocked detector (ERPLD) is capable of further threshold reduction. The most popular PLD is a second order type I system employing a loop filter having one real pole and one real zero.

One implementation of an ERPLD calls for the addition of a differentiator to the standard loop filter which replaces …

An Analysis Of The Heating And Densification Process During Rotational Molding Of A Thermoplastic Powder In A Uniaxially Rotating Cylindrical Cavity, Floyd Steven Ribe

Dissertations

This dissertation presents the results of an experimental and theoretical investigation of the heating and densification portion of the rotational molding process in a uniaxial, cylindrical mold.

A thorough literature survey is included which reviewed past analysis of the rotational molding process and other areas that assisted in understanding of the process.

The results presented in this dissertation included an analysis of the densification process by use of Scanning Electronic Microscope (SEM) photography producing intermediate correlations between the physical properties of the densifying material and neck radius of adjacent coalescing spheres. In addition, a hybrid experimental procedure coupled with a …

Determinant Factors In The Utilization Process Of Social Services In Saudi Arabia, Fahd Abdullah Ali Dileym

Dissertations

The Deputy Ministry of Social Welfare and the Deputy Ministry of Social Security provide a spectrum of social service programs and activities. However, utilization of the designated services is incapacitated by the existing gap between the potential clients and the social service providers. Certain barriers have contributed significantly to the clients' underutilization behavior of the assigned services.

Accordingly, this study had two purposes: (a) to determine whether social services provided by the Deputy Ministries of Social Welfare and Social Security are perceived by administrators, social workers, and college students to be underutilized; and (b) to compare the perceptions of the …

An Examination Of Critical Behaviors And Functions Exhibited By Teacher-Coordinators In Cooperative Work Training Programs, Loretta F. Nolan

Dissertations

No abstract provided.

Toward A Rationale For Foreign-Language Proficiency Requirements For Doctoral Degrees In Selected Professional Disciplines, Aurelia Rae Holman

Dissertations

Problem. In the United States, a uniquely American situation exists in that there appears to be no uniform or consistent comprehensive rationale underlying foreign-language study and proficiency requirements for doctoral degrees. As contrasted to students in other parts of the world, especially in Europe--where compulsory basic requirements are usually met by language studies in elementary through secondary school--most American graduate students are ill-prepared for foreign-language proficiency examinations on the doctoral level.

Method. Historical literature was reviewed to gather information regarding the development of foreign-language requirements in the United States and in Europe. In addition, a request for information about current …

An Investigation Of Teacher Voice Signal Amplification Treatment For Mediating Speech Communication Interference From Jet Aircraft Noise Intrusion And From Minimal Hearing Loss In First And Second Grade Classrooms, Kenneth L. Kaufman

Dissertations

No abstract provided.