Digital Commons Network^™

On Natural Frequency Of The Stiffened Hvac Ducts, Jin-Lian Ha

Theses

This thesis employs ANSYS program to calculate the natural frequency of a stiffened HVAC duct and to investigate the affect of these stiffeners to the values of the natural frequency.

Investigation through this thesis shows that increases in the number of transverse stiffeners mould increase the natural frequency of the HVAC duct and the installation of the axial stiffener mould also increase the duct natural frequency.

Electrochemical Reduction Of Quaternary Ammonium Salts, Rudolph K. Kapichak

Theses

The electrochemical reduction of two highly hindered quaternary ammonium salts was attempted. The reductions were performed in hexamethylphosphoramide at a controlled potential using platinum electrodes. It was anticipated that these reductions would provide a route to the formation of anti-Bredt bridgehead olefins. This work is an extension of the work of Dubois, Monvernay and Lacaze who electrochemically reduced quaternary ammonium salts such as trimethyl-t-butylammonium iodide (XX).

Trimethy1-2,4,4-trimethy1-2-pentylammonium iodide (XXIII) was reduced to form 2,4,4-trimethyl-l-pentene (XXVI) and 2,2,4-trimethylpentane (XXV). The yields of the two runs of this reduction were 10% and 20% and in the first run of the reduction 75% …

Optimization Of Reactive Ionized Cluster Beam (R-Icb) Technique For Deposition Of Gan Films, Veronica S. Kyriacou

Theses

The deposition of GaN film onto glass substrate, using the Reactive - Ionized Cluster Beam deposition technique was studied. The creation of clusters is dictated by various parameters such as the vacuum pressure inside and outside the crucible, the crucible temperature, and the nozzle diameter of the crucible. Optimization of these parameters was experimentally studied, and deposition of gallium films on glass substrates was tried as a first step.

The direct heating method was used at first to get the 1100¬1300°C crucible temperature which was required for the creation of gallium clusters. Although different tungsten wire diameters and different number …

The Gpib User's Manual For Hx-40, Ding-Tang Li

Theses

A completed RS-232 to GPIB interfacing system has been built for HX-40 to master the GPIB oriented machine through its serial port. GPIB commands and data can be transfered between HX-40 and the slave station, which is a HP 3582A spectrum analyzer in this project. The data acquisition from serial to GPIB is done by a well-made GPNET mode 10 interfacing board in a transmitting rate of 9600 baud rate. GPNET exchanges data and commands with HX-40 through a RS-232 port, and passes them to the slave station through a GPIB port which is coordinated by GPIB protocol. A software …

Microcomputer-Based System For The Measurement Of Facial Swelling, Michael Guy Demuth

Theses

The measurement of facial swelling after oral surgery can indicate the effect of anti-inflammatory drugs. A mechanical device was interfaced to a microcomputer to allow faster calculation of swelling. The mechanical system first established X and Y coordinates on the face. A feeler arm traced out the facial contours and two linear variable differential transformers (LVDTs) related X and Y displacements to voltages which were fed into a microcomputer via an A/D converter. Three BASIC programs were written which facilitated the analysis of patient swelling. MEASUREMENT stored the X-Y voltages from the LVDTs in a patient disk file. CALCULATION filtered …

Use Of Clay As A Landfill Liner, Mayur B. Desai

Theses

The purpose of this thesis is to study the factors affecting efficient functioning of clay material for containment of landfill materials. The study of liner-leacheate interaction is done from the consolidation and vane shear tests on various clays having different activities, and chemicals that are typically found in a municipal solid waste leachate and a leachate collected from an active landfill.

An effort was made to study the use of Atterberg limits to predict the suitability of a clay as a landfill liner for a given waste environment. The study indicates that there is a decrease in permeability of bentonite …

Simulation Of A Microprocessor Controlled Drill Press, Arun J. Ayyagari

Theses

The concept of flexible manufacturing systems has ushered new dimensions into machine tool design. The power of this new technique is that a high degree of flexibility in a machine tool can be easily achieved by developing a software based control system as against conventional hard wired systems in existence.

To demonstrate this point, a microprocessor based control system is developed, in this thesis, to control the automated drill press. The Motorola MC6808 8-bit microprocessor is chosen as an example.

The microprocessor first evaluates the optimum cutting parameters for the given cutter size, work material and operation. It then uses …

Dynamic Laryngeal Analysis : Hardware And Software, Augustine Chan

Theses

A data acquisition and analysis system has been built and tested for the study of laryngeal dynamics: The system uses a computer to control the digitizing rate and to coordinate the pitch prompting for the subject. Tokens of steady state laryngeal vibration are obtained from an electroglottograph when the subject intones a series of computer prompted pitches in a musically scalar sequence. The system digitize the data at a basic rate of 200 samples per laryngeal cycle: This procedure enables the system to perform a modal analysis of laryngeal function: The signal processing and analysis procedure developed displays voice registration …

Design And Construction Of An Atomic Nitrogen Source For Ion Cluster Beam Deposition Of Thin Film Nitrides, Sahar Elgharib

Theses

The objective of this thesis research was to generate atomic nitrogen to react with Ga being deposited by an Ion Cluster Beam method to prepare GaN thin films. An experimental reactor was designed and constructed to generate atomic nitrogen by making use of a microwave induced discharge to dissociate molecular nitrogen into atomic nitrogen. The concentration and the flow rate of the atomic nitrogen arriving at the substrate were measured by titration with nitrous oxide. The experiments were done with 0.32 square cm quartz tubing at room temperature over the nitrogen pressure range from 0.14 torr to 0.56 torr. Results …

Analysis And Evaluation Of The Developments In The Use Of Coal, Farid Najib Elkheshen

Theses

This thesis is a survey and evaluation of the developments in the use of coal. It deals with the social, economic, physical, and biological impacts of such a shift. It examines the complete coal system, from extraction to combustion, including the key steps and policy initiatives. The United States, with 6% of the world's population, consumes about 33% of its commerical energy supply - while the available reserve coal is about 80% of total energy in the United States, with coal use representing only 17%, oil and gas about 78% at present.

Technologies under development that might reduce costs, increase …

Effects Of Adhesion On The Active Pressure Exerted On A Retaining Wall, Thomas G. Gallagher

Theses

This paper investigated the effect of adhesion on the active pressure behind a retaining wall. No equation existed to solve for the active pressure for a sloped backfill that also takes into consideration cohesive and adhesive forces on a failure wedge. The trial—wedge solution(Culmann method) considers these parameters, but since it is a trial and error method it takes up too much time to solve. A shorter solution is desirable. An equation for the active pressure in terms of ρ(angle between horizontal and failure plane) was derived. A closed form solution for earth pressure was developed by setting the derivative …

Computer Application Of Project Planning And Scheduling With Cpm, Mohamed Tarek Abdel-Aziz

Theses

Scheduling is one of the most important tools for project management and control, and the CPM is one of the techniques used in project scheduling.

The primary objective of this thesis is to develop a CPM computer package using a microcomputer. The package is constituted in Basic (Applesoft Basic) for use on Apple II Plus, IIe or IIc.

The package is intended to be available to users without sufficient knowledge about computer. And it consists of two computer programs. The first computer program is the CPM-I which schedules project activities with unlimited resources. The second computer program is the CPM-II …

Computational Method For Solving The Kinematics Of Mechanisms Using Matrix Methods, Rajat Pardal

Theses

This thesis deals with the computational methods for kinematics of mechanisms using matrix methods. The method is particularly suited to the complex mechanism problems for which hand calculations are difficult. The thesis first reviews the matrix methods on which the program IMP is based. A computer program developed by Ve Tung using the same theory is enhanced in this thesis. By using this revised program, comparison between the non-linear algebraic approach and the matrix methods developed in this thesis has been made by the help of suitable examples. Further, it has been proved that the Integrated Mechanisms Program does not …

The Impact Of Fms On Batch Production Processes, Jan-Sheau Ho

Theses

A Flexible Manufacturing System (FMS) is an integrated system of combining metalcutting and other processes with materials handling under computer control. With computer control, FMS is capable of processing a variety of different types of workpieces simultaneously. FMS is an approach towards a balancing of high output on the one hand and great flexibility on the other hand. FMS stands as a new technology to improve the productivity of mid-volume, mid-variety production; therefore the manufacturing world will soon feel the impact of FMS.

This thesis attempts to specify what FMS is and how it works, the influence of FMS on …

Optimum Design Of Structures Subject To Buckling Constraints, Thomas G. Looby

Theses

This thesis describes the optimal design of bar type planar truss structures subject to stress and buckling constraints. All of the structures considered are modeled using the direct stiffness finite element approach. A mathematical programming method incorporating a feasible directions routine is utilized to develop least weight designs for these conditions. The existing structural optimization programme CADOS which has successfully solved stress and deflection problems for this class of structures is adapted herein to treat local stability constraints based on Euler bucking criteria.In addition the optimization routine is modified to more effectively treat, infeasible starting designs. These modifications were tested …

Finite Element Analysis Of The Prosthetic Acetabular Region, Katkuri Venkat Rammanohar Reddy

Theses

Femoral component loosening and prosthetic stem fractures have renewed interest in conservative alternatives to conventional total hip replacements. The objective in this study is to get interfacial stresses of a acetabular surface replacement cup. This is done by performing finite element analysis of the model. A solid three - dimensional model with a grid of 3D isoparametric solid elements is generated using ANSYS, a powerful finite element analysis package. The stiffness is considered to be linearly proportional to the stress in the acetabular region. The stresses are determined by performing iterative finite element analysis. Stresses arp computed using two different …

Sputtered Mercury Cadmium Telluride Heterojunction Devices : Electrical Characteristics And Fabrication Process, Ashish N. Mistry

Theses

The main objective of this thesis was to grow high quality epitaxial films of the compound semiconductor Mercury-Cadmium-Telluride (MCT) on Silicon and MCT substrates,using sputtering technology. The research was aimed at investigating the heterojunction behaviour at such interfaces. Detailed studies about the heterojunction theory were made. Devices were made using MCT substrates prepared at the Santa Barbara Research Center (S.B.R. C.),California.

Experiments were designed to grow MCT films with high electron mobility and low carrier concentration in as-grown MCT films and some results were obtained close to reported data for high grade bulk material. Since the parameters involved in sputter …

Storage Of Information On Color Photographic Materials With Applications To Optical Memory Disks, Andrew Juenger

Theses

An experiment was performed to investigate the information capacity of Ilford Cibachrome Micrographic Film type CMM.F7, Kodak Aerial Color Film type SO-242, and Kodak Vericolor Print Film type 4111. The results indicated that the filmSj-had binary single layer information capacities of 9.51 x 10 , 3.27 x 10 , and 0.87 x 10 bits per square centimeter respectively. It was estimated that the CMM.F7 material was capable of resolving three density levels for c trilayer multilevel capacity of 45.2 x 10 bits per square centimeter, followed by SQ-242 and 4111 with five and six levels yielding 22.8 x 10 and …

An Extended Relational Data Base Management System For Engineering Design, Charles Fung

Theses

At present, the use of the relational model in the engineering design support domain is restricted due to the following: lack of ability to handle complex objects, no support for Abstract Data Types, inappropriate concurrency control for long transactions, no support for versioning and update propagation, poor efficiency, and insufficient design rule checking and consistency contraints enforcement. A simple relational database management system is designed and implemented under the UNIX operating system to incorporate two major extensions: support of user-defined Abstract Data Types and operators, and built-in Design Data Versioning. The design, implementation, and possible extensions to these new facilities …

A Market Study On The Viability Of Small Launch Firms, Allen George Dyer

Theses

As the United States only launch vehicle program NASA'~ Space Shuttle forced the shutdown of conventional launch vehicle operations . A system whose profitability depended on frequent use, but which, instead , incurred numerous launch delays, the Shuttle soon could not cover the cost of itself much less turn an profit. The French Ariane, albeit a simpler launch vehicle, soon successfully competed with the Shuttle for payloads.

The Reagan Administration, by various supportive measures, encouraged the market entrance of commercial launch firms . The Shuttle and Ariane, however, subsidized by their respective governments , set prices so artificially low that …

A Utilitarian Approach To Spelling, Peggy Jean Laws Korane

Theses

Traditionally, most spelling curricula includes the routine of introduction, practice, and testing of a weekly spelling lesson. This mundane repetition need not become a nemesis. The following spelling curriculum is a utilitarian approach to a spelling curriculum for the future. With this utilitarian approach, it can be made to enhance other work being performed in the classroom, making all experiences valuable in meaning other than learning a group of predetermined words chosen at random.

This utilitarian spelling program has been created because of a need to enhance legitimate meaning in the study of spelling. Past experiences have determined that students …

Management Of Personnel Systems, James P. Ward

Theses

The "Management of Personnel Systems" course (BA-332), taught at Lindenwood College in Spring 1986, provides a comprehensive framework for understanding key components in personnel and industrial relations. Designed for graduate-level students, the course emphasizes both theoretical foundations and practical applications of human resource management. Its core objective is to equip students with the philosophy, skills, and experiential learning necessary to operate effectively within the personnel function of organizations.

The syllabus covers a broad spectrum of topics, including job analysis and design, staffing and recruitment, equal employment opportunity, performance appraisal systems, compensation and benefits, labor relations, collective bargaining, organizational development, safety …

A Study Of Need Achievement Motivation: Motivational Differences In A Private For Profit Hospital Versus A Non Profit Private Hospital Setting, Kenneth W. Mihill

Theses

The subject of need achievement is of prime importance in today's industry . Motivating employees and using the resources the modern corporation has at its disposal have never been as important to industry as they are today . Unmotivated employees cost corporations heavily in terms of absenteeism and loss of productivity , which are then reflected in profits.

This research project concerns whether or not there are different levels of need achievement in a private non- profit hospital organization versus a private investor- owned (for profit) hospital organization . Three groups , each of 20 subjects, were studied . The …

Marketing Customer Service Within The Information Movement And Management Industry, Mark Jones

Theses

The goal of this project is to determine what characteristics of the service firms are considered critical to success of vendors within the information movement and management industry.

The first task undertaken was to determine a definition for the information movement and management industry and which firms were major competitors within the industry . The size of the industry in terms of employees and revenues was then estimated. Some of the characteristics of the major competitors were then expanded.

The next activity involved the determination of what factors the information movement and management market members used to select a vendor …

Tradition And Transformation In Arab Education: The Challenge For Saudi Arabia, Maha Muhammad Lufti Adeeb Al-Najami

Theses

This thesis focuses on the developments in education in the Arab world .. It begins with a broad historical survey of traditional education in the Middle East. Traditional educational institutions are viewed in the context of the Islamic religious heritage and the various Islamic dynasties which developed throughout the Middle East. Then, the consequences of the Western influence on Arab education are explored. A brief history of Western colonial interests in the Middle East is given focusing on the effects of these colonial interests on the traditional educational programs. The Western impact began the process of modernization in the Arab …

The Effect Of Corporate Advertising On Stock Prices, Teresa M. Burke

Theses

Not available.

Emerson E & S Division's Management Technique: An Exploratory Survey Into The Benefits Of An Integrated Business Environment, Timothy Fitzsimmons Carr

Theses

Over the past few years, integrated business environments have become popular in the defense industry . An integrated business environment is a method used to unify all management and engineering activities required for a company to perform on a contract. The follow i ng research provides an introduction to the concepts of managing technological business through streamlining the efforts of all human and non-human resources involved, and secondarily , an exploratory survey into some of the important benefits and open issues that are being explored and debated among users, developers and maintainers of test program sets.

A Method Of Storage And Display Of Chinese Characters As Graphic Symbols, Lo-Yi Chung

Theses

Not provided.

Vector Quantization Of True-Color Images, Stephen H. Kristy

Theses

Vector quantization (VQ) has recently emerged as a powerful and efficient technique for digital speech and image coding. The goal of such a process is data compression: to minimize communication channel capacity or digital storage memory requirements while maintaining an acceptable fidelity level of the data. A review of various VQ algorithms and their respective design considerations as applied to color images is given. Fidelity measurements and signal-to-noise ratio calculations are discussed. A modified mean-residual vector quantizer using the LBG design algorithm with color signal preprocessing is described. The algorithm is developed to yield a bit rate of 0.709 bits …

Resonant Dc/Dc Converters: Modeling, Control Strategies, Simulation, And Experimental Studies, Yung-Lin Lin

Theses

Resonant power converters are switched RLC circuits where the switching action creates oscillatory current and voltage waveforms at the resonant frequency of the circuit . There are two basic types of resonant converters: the series type and the parallel type. In the series resonant converter the output i s connected in series with the resonating elements which are comprised of the resonant inductor and capacitor. In the parallel resonant converter, the voltage across the capacitor is sensed and coupled to the output port. The output parameter (voltage in the series resonant converters or current in the parallel resonant converters) and …