Digital Commons Network^™

Reliability Studies On Microcircuit, Salim Shehadeh

Theses

The primary objective of this thesis is to determine and analyze the failure mechanisms of Low Power Schottky microcircuit device (2-Input NAND Gate). Pinpoint the causes, and suggest the precautionary measures that prevent the occurrence of these failures. To achieve this goal, the study went in two directions, theoretical and experimental. The theoretical part is a comprehensive review of the work done on Low Power Schottky 2-Input NAND Gates since 1960 up to date.

The experimental part of the study is a life test ( 1000 hours ) of 2-Input NAND Gates under humidity and high temperature.

For each unit, …

Life Testing Of Solid Dielectric Materials, Muhammad Irfan Soomro

Theses

The main objective of this thesis was to find correlation between the electrical noise generated within the body of the solid dielectric material with the failure (puncture), under simultaneously applied thermal and electrical stresses.

The term 'Corona' is commonly used to describe any partial discharges occurring in voids (defects) in the material. Precisely corona is a flow of electrons and ions which occur in a void in air or other gasses. This event emits acoustic, optical and radio frequency energy, and can be detected by measuring any of these radiations. In the present thesis, Radio Interference Voltage (RIV) technique was …

Method Of Moments Analysis Of Very Thin Wires Using The Mini-Numerical Electromagnetics Code, Douglas F. Stolarz

Theses

The analysis of thin wire antenna systems in the presence of a conducting ground plane is an important engineering problem. This thesis presents an analysis of wire radiators using the method of moments as implemented in the Mini-Numerical Electromagnetics Code (MININEC). Due to singularities in the formulation, MININEC yields inaccurate results for very thin wires. This code was modified by introducing filament currents for very thin wire structures thereby eliminating inaccuracy due to the treatment of singularities.

The modified code was tested on a monopole over a perfect ground, symmetrical and asymmetrical dipoles in free space, and inverted L and …

Wear And Development Of Wear Testing Methodology, Tirumalai S. Suresh

Theses

The existing wear and friction theories, and wear testing methods have been analysed to meet the objective of this study. One of the key factors in the analysis of a wear problem is the computation of wear and friction coefficient for a material, under real operating conditions. A new wear testing methodology has been developed and a wear tester has been designed and assembled. The tests have been performed at constant sliding speed and different applied loads for a Cast-Iron - hardened Steel pair.

Current Trends In Facilities Planning, Chaochou Yang

Theses

In the past year the costs of computing and computer graphics have come down dramatically. At the same time, the computer graphic system has become easier to use, As a result, computer support has become more costeffective than before.

In this thesis, the writer describes types of systems first, then looks at computer usage. He first defines the technologies of DSS, CAD and MIS, then takes a detailed, step-by-step look at facilities planning and the various ways in which computers are used for support. Well-conceived planning is an important prerequisite to effective computer use. The remainder of the thesis expands …

Non-Linear Finite Element Of Analysis Of Reinforced Concrete Members, Chellathurai Jeyamohan

Theses

A finite element analysis of reinforced concrete members is used to study the initiation and propagation of cracks and the behavior at the interface of concrete and steel. The increase of concrete strength due to the biaxial compression and the shear capacity of the cracked elements are also considered in the analysis.

The results of the present analysis are compared with some available experimental data in beam tests. It has been found that the present analysis is capable of calculating the stress ( or moment ) and strain ( or deformation ) from zero load upto the ultimate load.

Stress Analysis Of A Stepped Shaft With A Keyway, Irfan Hussain Sabir

Theses

A stress concentration case which is encountered in practice more than any other is the shoulder fillet. Shafts, axles, spindles, rotors etc., usually involve, in each case, a number of diameters connected by shoulders with fillet radii and very often it is necessary for a keyway to be near a shoulder. The objective in this study is to analyse the stresses in a shouldered shaft with a keyway subjected to an axial tensile load and to study the dependence of the keyway-end stresses on the distance between the shoulder fillet and the keyway end. This is done by performing a …

Management Training In Small Business, Harry L. Bargholz

Theses

Human Resources Professionals are often faced with the issue of "the need for and usefulness of management training." In addition, small business people believe that the needed training is unwanted and, in somecases, impossible to deliver. On the other side of the issue, training supporters point to the need for knowledge, the constant obsolescence of learned skills and the highly competitive nature of the marketplace.

The argument continues that whereas managers in larger firms may be able to afford numerous in-house training programs or be able to send employees to assorted workshops and conferences, the manager in a small enterprise …

Management And Organizational Effectiveness Examined : Past Practices And Theories Versus The Future, Ronald J. Boyer

Theses

The primary objective for this thesis is to collect and analyze data on how a new model for business organizations might best be formulated. There seems to be a consensus among authorities in the field that because modern business practices are so complex, indeed they have been revolutionized in many areas in the past decade. New organizational techniques must be devised if organizations are to remain as effective and as efficient as in the previous area. Some have claimed that the present structural model has reached the point of no return-that is, no longer functional because of such factors as …

Finite Element Stress Analysis Of The Femoral Hip Stem Prosthesis - Bone Interface, Mark C. Buechel

Theses

A three-dimensional finite element model is used to examine the stresses of the femoral hip stem prosthesis and surrounding bone, specifically at the interface between the stem and the bone. Using General Electric's GEOMOD modelling program, 3-dimensional models of the hip stem prosthesis, and both the cortical and cancellous bone, are generated. Due to the complexity of the individual models, General Electric's SUPERTAB modelling program is required to merge the three separate models into one complete model. The model is then broken down into finite elements for analysis. The model assumes isotropic properties to cortical bone and cancellous bone. Several …

Management Controls And Modeling With Personal Computers (Pcs) For Material Procurement Within The Department Of Defense (Dod), Stefano Coppola

Theses

As an inevitable fallout of the microcomputer explosion, micro-to-mainframe links have been praised as an effective means of satisfying microcomputer users who insist for more processing power and less dependence on mainframe data processing. Personal Computers used to emulate terminals offer local storage capabilities as well as financial analysis and graphics.

Using a Personal Computer, Lotus 123, and a simulated PC-Link, a management control system was designed to satisfy the Department of Defense Instruction (DODI) 7000.2 for material procurement.

The resulting model provides both the Government and the contractor's management control system with a reliable, timely, and auditable system that …

Energy Analysis Of A Multistory Office Building Using Bin Method Computer Program, Mohammed Nasim Ghauri

Theses

The consumption of energy by an HVAC system in a high rise office building was investigated by comparing results obtained from ASEAM and Trakload (two microcomputer programs) with the manual calculations and DOE-2 (Department of Energy Program) results obtained by Tishman Research Corporation. The study was performed on the Public Service Building of Newark, New Jersey. It is a 26 story office building, designed to be energy efficient.

The results obtained show that, the energy consumed by the HVAC system is a substantial amount of the total energy used but the controlling factors are electrical lighting and equipment. Both of …

Empirical Study On Employee's Ownership, Anthony Chuks Ibida

Theses

Employees Ownership in the United States has been in existence for many years and it seemed to be a utopian idea of no real consequence to the general public. Now employee ownership has gone a drastic change and it has become a major focus of media attention, and we are observing an extra ordinarily rapid increase in interest and involvement among practitioners in law, banking, and organizational consulting, along with growing government interest.

As the name indicates employees ownership or worker cooperative firms have a long but spotty history in the United States. Some researchers traced over eight hundred firms …

Recruitment Of Engineers In A Small Company, Robert Cohen

Theses

With most recruitment techniques written for large companies, recruitment of engineers in a small company may be a large problem. A detailed analysis of the engineering employer and employee is constructed making note of large and small company differences. A survey was taken and the results are presented in support of the authors opinions. A generic recruitment technique is also presented, followed by modifications or other considerations to that technique. This should increase the available applicant pool and optimize quality levels of the engineering candidates for the small company.

A Study Of Failure Modes In Rock Resulting From Pile Penetration, Girish Mehta

Theses

The purpose of this thesis was to physically examine the failure mode of a rock mass as a result of pile penetration. In addition, the static bearing capacity of piles bearing in rock was investigated. This was accomplished in the laboratory by performing model tests using a dynamic pile driving device.

Tests were performed using 1 inch nominal diameter model pipe piles and H-piles. Piles were driven into a simulated rock mass consisting of clay-masonry bricks. Following pile driving, the rock mass was carefully dissected and observations of the failure mode were made.

A new technique was developed to preserve …

Probabilistic Technique In Power Flow Analysis, Dun-Ren Tzeng

Theses

This thesis describes and examines a technique which permits the power flow problem in a power system to be analyzed probabilistically. Both the deterministic and the probabilistic power flow theories have been presented. A mathematical model and a program have been developed to carry out the probabilistic power flow calculation. Two power systems and seven different loading cases have been used to test the technique. The results including the sensitivity coefficient matrices, the expected line flows with their variances, and 25 of 176 probability density function curves, have been shown and discussed. An easy way to predict the possible abnormal …

On The Implementation Of E.R.I.K - Effective Retrieval Of Information By Keyword: An Information Storage And Retrieval Research System, Eric Tyler

Theses

The accelerating production of information, often referred to as the information explosion, requires specialized methods for the storage and access of this wealth of knowledge. One solution to the problems of indexing, filing and retrieval of information has been Information Storage and Retrieval (ISAR) systems. The purpose of this thesis is to implement a functional experimental system (known as ERIK – Effective Retrieval of Information by Keyword) for research into various aspects of information storage and retrieval. An ISAR system has been created, incorporating numerous features found in both commercially available and recent research retrieval systems, as well as a …

Computer Imagery And Creative Energy, Linda K. Saxton

Theses

During the creative process energy becomes manifest through some form, be it nature, people, thought, or object. Individuals can expreience and absorb this energy directly through awareness of the subtle energy body and by developing its inner technology or system of energy centers and channels for the purpose of revitalizing body and mind and for transforming consciousness. It was my intent in this thesis to develop a videotape that would extend knowledge about, provide an experience of, and be an expression of creativity as the flow and manifestation of higher creative energy, higher referring to levels of refinement, the highest …

Surface Design, Marie Emmanuel

Theses

None provided.

A Survey Of Current Practices In Teaching Remedial Reading To Determine Congruence Of Opportunities For Reading Development, Ruth Hubbard Richardson

Theses

The purpose of this study was to determine current practices in providing opportunities for reading . development for remedial reading students in mid- Missouri schools, Callaway County, Hermann R-1, Montgomery County R-3, Warren County R-3, and Wellsville R-1, and to relate those practices to the attitudes of teachers responding to the survey. It was intended to elicit information regarding practices in remedial reading compared to classroom reading instruction, reading instruction compared to library usage, and reading instruction compared to language instruction. Responses were assessed to determine areas of congruence or closely related practices and to determine the effects of perceived …

Psyxpert: An Expert System For Aiding Psychiatrists In The Diagnosis Of Psychotic Disorders, Mary A. Overby

Theses

Psyxpert is an expert computer system designed to aid psychiatrists in the diagnosis of mental disorders when psychotic features are the prominent part of the presenting clinical picture. The knowledge base contains psychiatric knowledge in the form of production rules. The system uses a backward-chaining control strategy to guide the consultation. Psyxpert provides a menu-driven user interface and an explanation subsystem. The system uses certainty and importance measures to produce a diagnosis with an attached certainty factor and recommendations for further evaluation or therapy. Psyxpert is written in Virginia Tech HC Prolog and runs on Digital Equipment Corporation's VAX 11/780 …

A Finite Element Solution Of Thermal Wave Propagation In Elastic Media, Dominic N. Dalo

Theses

The rational theory of thermodynamics is used to develop equations governing the propagation of thermal waves. A new vector quantity is introduced to account for the thermal waves. The phenomenon of thermal wave propagation is illustrated by considering the problem of one-dimensional heat conduction in a finite slab subjected to a heat flux pulse. The solution is obtained via the finite element method. A discussion of the results and their significance is also presented.

Stylistic Analysis And Recognition Of Piano Sonatas Of Four Composers -- Mozart, Chopin, Debussy, Anton Webern, Emily Feng-Hwa Lin-Jeng

Theses

This thesis describes a system that incorporates techniques developed by musicologists to do stylistic analysis of music, an important applied field in music theory analysis. To do the analysis requires the knowledge of many musicological analysis methods and pattern recognition algorithms that are central issues to this project. In addition, AI techniques of learning were used to improve the whole system's skills. The conclusions reached as a result of this project were that computers can perform musical tasks usually associated exclusively with naturally intelligent musicologists, and that learning techniques can expand and enrich the behavior of musically intelligent systems.

Partitioning And Protecting Control Program Function Through Virtual Storage, Thomas J. Murray

Theses

Many operating systems are endowed with the ability to access every byte of addressable memory in the processor complex. Unfortunately, a control program so designed creates an exposure of the following nature: It is possible for an errant section of operating system code to unwittingly modify (and perhaps destroy) either its own storage or the storage of others. This thesis addresses this problem and discusses the design and implementation of a control program in which many such attempts at destroying storage are detected and suppressed. This is accomplished by placing separate control program functions in separate virtual storages. The thesis …

A Statement In Pattern, Dennis Earl Maust

Theses

None provided.

Alternatives To Lay Off, Davidson Nwaneri Okere

Theses

In the recent years, there have been some changes in the American corporate life. These changes have been occasioned by some external factors which adversely affect the profitability of the companies. In order to address this problem, many corporations have resorted to cutbacks which more often than not, affect a great bulk of the human resources.

The purpose of this study therefore, is to explore the strategies which companies could use, rather than lay off, during business downturns; and still remain competitive and profitable.

Chapter one of this study focuses on what companies should do to help the affected workers …

The Feasibility And Economics Of Resource Recovery Using Municipal Solid Waste, Joachim Aloysius Pinto

Theses

This thesis gives an overview of the feasibility and economics of a resource recovery project. The feasibility study of a resource recovery project is done by analyzing its markets, economics, and environmental aspects. The use of market development, accurate capital and operating cost estimation procedures and environmental impact analysis help in predicting fairly accurately the feasibility of a resource recovery facility and also gives a good estimate of the economics of the project.

The thesis also discusses the different system design that are or were used in waste-to-energy conservation. It is quite evident from the discussion that the only two …

Performance Of Second Order Delta Modulation System, Reza Aghazadeh Alavi

Theses

The performance of an ordinary delta modulation (DM) system under three types of input signals was investigated. These signals were band limited Gaussian noise, 800 Hz sine wave, and speech signal. The affects of 2nd DM added to the ordinary DM in improving the performance of the system were researched. This is called a Second Order Delta Modulation System. The obtained data showed an increase of about 3dB in the overall Signal to Noise Ratio (SNR) of the system, in the worse case.

Input to the 2nd DM is the band limited error of the first DM. A linear phase …

Stress And Today's Working Woman, Tommie Mae Byers

Theses

The eighth wonder of the world is fast becoming the great American job machine The employment rate has declined in most industrial nations while 20 million jobs have been created in the U. S. during the past 10 years. The principal reason for this rise in job placements is the large influx of women into the labor force.

Two-thirds of the jobs created over the past decade have been seized by women. The post-industrial environment which has produced an extensive number of service-type businesses has substantially opened the job market for women. Financial experts will contend that an expanding labor …

White Chief: The Story Of Edward H. Davis, Charles Mitchell Hudgins

Theses

With Mother Earth for a couch, To sleep under the fragrant conifers; To breath the purity of the ranges; To watch the procession of the constellations; To listen to the music of the wind harps of the sierras; To leave care, worry, responsibilities behind us; To be in harmony with nature at all times; To live simply, to think severely, the love deeply, to be content; And to learn patience and tolerance from the mighty mountains; That me thinks is to be happy. Edward H. Davis Mesa Grande August 26, 1933