Engineering Commons^™

Spontaneous Coherent Pulsations In Ring-Laser Oscillators: Stability Criteria, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

The stability criteria implied by a simplified semiclassical laser model are considered in detail. It is found that two types of criteria must be distinguished. The first concerns the smallest pump rate for which infinitesimal perturbations of the steady-state solution will increase with time, and the second concerns the smallest pump rate for which large amplitude modulations will not damp away.

Computers And Robotics, Wayne Tinga

Pro Rege

No abstract provided.

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 …

Protective Laboratory Measures For The Flexible Wall Permeameter And The Atterberg Limits Tests Using Hazardous And Toxic Chemicals, Robert A. Tetla

Theses

Safety procedures for performing geotechnical testing with hazardous and toxic materials, excluding radioactive wastes, are developed for the Flexible Wall Permeameter and the Atterberg Limits Tests. The tests were evaluated in detail to determine the critical points at which the technician would be exposed to the hazardous and/or toxic permeant. It was found that the following safety measures should always be taken; 1) the apparatus and all testing should be undertaken in a sliding sash hood using the proper face velocity, 2) air monitoring using a personal dosimeter and/or a detector tube is required to assure that the concentration of …

Improving The Capabilities Of The Chemical Engineering Simulation System (Chess) Computer Program, Thomas Zvolensky

Theses

Chemical process simulation programs have become an indispensable tool to chemical engineers in the preparation of heat and material balances, and energy conservation studies. Since the 1960's several dozen process simulators have been developed which are in use today within companies and through computer service bureaus. Due to advances in the areas of unit operation analysis and thermodynamic relations, these programs require periodic modification. This thesis describes the programming modifications made to the Chemical Engineering Simulation System (CHESS) version 2.0, computer program. This undertaking was considered warranted since no improvements have been made to CHESS since its release in 1971. …

Test 1567: Versatile 836 Powershift Diesel 12-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Putting The Lid On Spares : A New Estimating Concept, George Zahodnick

Theses

Government standards and regulations, such as the CASB and FAR can be used as a guide by Contractors in preparation for negotiating orders for spare parts. More recently, in response to bad publicity involving spares, Contractors and Government officials have shown a trend toward greater micromanagement in the military acquisition process.

Spares proposal preparation, which was already often time consuming relative to dollars proposed for parts, has become an extremely serious subject often requiring additional levels of internal review and comprehensive supporting documentation. As a result, a considerable amount of new business expenditures can be associated with preparing proposals for …

Managing The Transition Of An Army Program From Engineering Development Into Production, Thomas Joseph Thomas

Theses

An overview of the entire Army Research, Development, and Acquisition process is presented. The research, development, test and evaluation phases are detailed. Special emphasis is placed on the Army Producibility Engineering and Planning Program. Examples of the different elements of our Army Production program are described. Finally, the focal point during the transition, the Milestone III and the events surrounding it, are discussed.

Application Of Manufacturing Resources Planning To Repetitive Manufacturing Environments, Irma L. Yuen

Theses

Most of the methodology for Manufacturing Systems has been devoted to Job Shops. Frequently the assumption has been made that, because Job Shops are the most complicated their methodology should fit Repetitive Manufacturing as well.

For years the Repetitive producers had been ignored as Production and Inventory Control Techniques were developed, implemented and refined to assist discrete Job Shops environments with Material Planning problems.

The application of modern Production and Inventory Control Techniques especially MRP II in the Repetitive Manufacturing Industries is receiving increasing attention from experts in the Production and Inventory Control field.

During the research for this Thesis …

Buckling Of Some Grooved Columns, Clovis Georges Baaklini

Theses

Columns with two types of transverse grooves are analyzed: a one-sided groove whose bottom is parallel to a vertical plane and cross-section is constant, and a concentric uniform groove. Then, for illustration and to be more specific, round columns are selected such that the cross-section becomes partially circular, for one-sided grooves and totally circular for a concentric groove. The columns are simply supported at both ends and subjected to a compressive eccentric load P at eccentricity e. The static equilibrium of such columns is studied via two types of solutions: the solution to three-segment column and a substantially simpler but …

An Integrated, Interactive Analysis And Design Of High-Rise Buildings On Micro-Computers, Vijayakumar Balusu

Theses

The implementation of Computer-Aided-Software, coupled with matrix and finite element techniques permitted the analysis and design of structures to the desired degree of accuracy and modelling. The successfulness of micro-computers in a vastly business oriented market has prompted the structural engineer to take advantage of cheaper and efficient micro-computers in the analysis and design of structures particularly the high-rise buildings. The availability of a comprehensive, integrated software for the analysis and design of high-rise building frames that can be operated on a micro-computer is either not currently available in the market or the available software programs do not fulfill the …

The Evaluation Of New Jersey's Remedial Response Program With Regard To The Use Of Risk Assessment In Determining Extent Of Cleanup, Susan Christine Gieser

Theses

In order to effectively manage the cleanup of hazardous waste sites the New Jersey Department of Environmental Protection developed a comprehensive Master Plan. Under P. L. 1983, c. 222 (A-1255) the Hazardous Waste Advisory Council was charged with reviewing New Jersey's remedial action program. One issue identified by the Council for review was the use of risk assessment for determining extent of cleanup. The study was comprised of a literature search, review of legislation that impacts on this issue, interviews with DEP personnel, and consultation with others from academia and industry to recommend what is an acceptable risk and its …

The Accident Prevention Responsibilities Of Management, Kenneth A. Hogue

Theses

The principles of industrial safety described in this paper are discussed from the viewpoint of the industrial supervisor. Maintaining a safe work environment is considered to be a prime responsibility of line supervisors. Accident prevention is viewed as avoidance of unsafe acts and conditions. Guidelines are suggested which enable the the supervisor to impart a safety consciousness on the worker. The Occupational Safety and Health Act and its practical implications are discussed from the standpoint of reporting, correction of unsafe conditions, and penalties. Recommendations are made in the areas of training, communication, and employee motivation.

A Parameter Identification System For The Human Electroretinogram, Yu-Huai Hsiao

Theses

The human Electroretinogram (ERG) is obtained in a clinical test to detect physiological abnormalities in the eye. A mathematical model of the ERG has been developed, as well as a system to identify its parameters. The system utilizes several computers. The data acquisition and initial processing is done on a previously developed system at the Eye Institute of New Jersey and the University of Medicine and Dentistry of New Jersey, which has been modified to provide the facility for further processing. Software was developed to use a MINC-11/23 computer at New Jersey Institute of Technology to transfer data between the …

Optimal Design Of A Dynamic Structural System, Azhar Imtiyaz Khan

Theses

This Thesis studies optimal design of structural dynamics, based on the State Space approach which uses the Design Sensitivity Analysis and the Adjoint Variable Technique. As a numerical example, optimal design of a multistory structure subjected to a dynamic response, similar to that of an earthquake, is chosen. The equations of motion of the structural system are constructed using the Finite Element method, treating the cross-sectional area of each story as a design variable. To solve the equations a package program DE is used. A program is developed based on the State Space Algorithm and the cost function, constraints and …

An Investigation Of Structural Requirements For Computer-Integrated Manufacturing System, Deok-Soo Kim

Theses

This thesis mainly deals with the structural requirements for integration of Computer-Aided Design, Computer-Aided Manufacturing, and Computer-Aided Process Planning functions to achieve ideal Computer-Integrated Manufacturing system. Attempts to define the terminologies and to find the reasons which necessitate these technologies have been made. This work also examines the business issues to justify this concept.

This thesis considers that Computer-Integrated Manufacturing system consists of three major ingredients: Computer-Aided Design, Computer-Aided Manufacturing, and Computer-Aided Process Planning. Flexible Manufacturing System is dealt as an physical shape of Computer-Aided Manufacturing. As the result of integration, the interface rises as a serious problem, and comprehensive …

The Effects Of Ultrasonic Excitation Of A Hydrocarbon Fuel On The Performance Characteristics Of A Spark Ignition Engine, Michael John Kooman

Theses

A six cylinder, 200 cu. in. spark ignition engine, model 1-AC-100-200 manufactured by Ford was tested by means of a Clayton dynamometer, model 8-200. The purpose of the test was to establish a reference base and to determine the effects of ultrasonic excitation on performance and combustion characteristics of the internal combustion engine. Variable load tests were performed at full throttle, 90% throttle, 60% throttle, and 40% throttle for the standard carburetor and the carburetor modified for ultrasonic excitation. Power was supplied by a Firbra-Sonics, model G-100 Mark 3, Ultrasonic generator. Exhaust gas concentrations were measured by means of a …

Evaluation Of Pressure Capacity Of Rectangular Hvac Duct Plates, Ming-Tui Liu

Theses

The purpose of this thesis is to evaluate the pressure capacity of the duct plates for HVAC design as recommended by Sheet MeLal and Air Conditioning Contractors' National Association, Inc, 1980, whose code is based on the theories of both one-dimensional and two-dimensional analysis. Various sizes of duct width and stiffener spacing for rectangular plates are investigated, Charts and plots are Provided to facilitate the HVAC desidn. A BASIC language program and disc for personal computer is also provided.

A Pitch Based Processor For The Analysis Of Steady State Laryngeal Modes, Tzyy-Jenq Lou

Theses

A data acquisition and analysis stem for use in the study of laryngeal dynamics has been built and tested. The special feature of the system is the computer controlled digitizing rate and coordinated subject pitch prompting. Tokens of steady state laryngeal vibration are obtained from an electroglottograph when the subject intones a series of computer prompted pitchs in a musically scalar sequence. The digital samples of this data are captured by the system at a basic rate of 200 samples per laryngeal cycle. This procedure enables the system to perform a modal analysis of laryngeal function, not unlike the analysis …

Pressure Distributions In Microvascular Network, David Moshenberg

Theses

The objective of this study was to find a practical way of estimating the pressure distribution in a network of microvascular vessels. The pressure distribution was evaluated twice, namely before vasodilations or vasoconstrictions and after the network of vessels reached a new steady state with respect to pressure and flow. Along with determining the pressure distribtuion, the simulation also calculated an effective blood viscosity coefficient for the network.

Poiseuille's equation and the axial component of the equation of motion were used to evaluate the steady state pressure and velocity distributions in each vessel. The continuity equation (conservation of mass) was …

Reliability Problems And Failure Mechanisms Of Solid Tantalum Capacitors, Ghanshyam B. Nakrani

Theses

Today, reliability is acknowledged as an important item in design and the operation of the electronic systems.

This thesis provides some theory, and experiments are instituted to evaluate the reliability for SOLID TANTALUM CAPACITORS made by different manufacturers. The experimental life test work was done at high temperature of 9S 2°C and high humidity of 95 ± 3% on transfer molded tantalum capacitors.

Literature study concentrates on the reliability in solid tantalum capacitors developed between 1961 and 1984.

Several failure mechanisms with figures are illustrated to point out how higher reliability of solid tantalum capacitors may be developed.

The bibliography …

Review Of Construction Management Procedures Of New Jersey Department Of Transportation With The Objective Of Minimizing Claims, Suresh Kumar Ceyyur

Theses

Recent years have evidenced a growing spate of construction claims being filed against NJDOT. A mail survey was conducted and problem areas of NJDOT construction management procedures frequently contributing to claims have been identified. NJDOT's pre-construction scheduling system has been reviewed to suggest improvements and practical integration to obtain effective feedback. NJDOT's organizational structure has many administrative bottlenecks and is overly bureaucratic. An analysis reveals that by way of minimal revamping and by integrating design and construction divisions better coordination can be achieved, bureaucratic norms reduced and the structure made resilient to react quickly to claim situations. Sources and causes …

Microcomputer Controlled Continuous Activity Monitor For Small Caged Animals, Yogesh Parekh

Theses

The task of this instrumentation system is to measure the activity of rats in a controlled experiment. The system is designed to work in conjunction with the system for studies of metabolic rates in rats. The interface circuits take the picture from a video (vidicon) camera into the computer. Once the picture frame is taken into the high resolution graphics screen memory area, the computer uses this data to detect the activity. The movements of the rat are detected by comparing the number of pixels changed between two consecutive picture frames. The area covered by the rat determines the standing …

Computer Simulation Of Drop Weight Impact Tests On Plastic Parts Or Sheeting, Upendra V. Patel

Theses

The ASTM D3029 drop weight test on plasic parts or sheeting is simulated in this thesis. The simulation is accomplished by using the Bruceton staircase method or the Up-and-Down method and the normal distribution theory. The "Probit" method is also analyzed.

The simulation programs are done in FORTRAN computer language. First, the random number generator is used to find the probability value between 0 and 1.0. Then, the cumulative probability distribution formula is used to find the absolute standard normal value. This absolute standard normal value is converted in to X normal value using given input values of mean and …

Axisymmetric Air Jet Impinging On A Hemispherical Convex Plate, Salahuddin Qureshi

Theses

This experimental study was carried out on an axisymmetric air jet impinging normally on a smooth, hemispherical convex plate. Three different nozzles of diameters 0.5in.(12.7mm), 0.375in.(9.525mm) and 0.25in.(6.35mm) were used and the nozzle exit Reynolds number varied from 14,000 to 80000.

The impingement hemispherical plate was made of brass and had a nominal outer diameter of 7.48in (189.99mm).

Calibrated Pitot tubes, U-tube manometer and a micromanometer were used for pressure and velocity measurements. The Pitot tubes were mounted on Precision position mechanisms permitting the accurate traversing in any direction in space. The test air flow rate was measured with calibrated …

Magnitude And Frequency Of Floods : A Comparison Of Regional Methods In The United States, Frank A. Rogalla

Theses

To allow the safe and economical design of structures in flood plains of natural streams, techniques to estimate the magnitude and frequency of floods are established through multiple regression analysis for each state, relating flood peaks to topographic and climatic characteristics of the drainage basins. This study describes and compares the regional equations to assess peak flows for 2, 5, 10, 25, 50 and 100-year recurrence intervals in different states of the U.S.A.

Publications from 40 continental states were reviewed and the regression equations analyzed on similarities and accuracy. Tables compare parameters, their frequency of occurence, and the constants and …

The Impact Of Microcomputers On Engineering And Technical Management Functions, Salvatore Savino

Theses

The purpose of this study was to investigate the perceptions of managers as to the effect of computers on management functions.

Manager perceptions were determined by using a ratio scale of value ranging between 0 and 100. Findings are based on questionnaire responses of 121 top, middle, and lower managers in 120 firms in the United States.

Several hypotheses were examined in the study relative to (1) perceived computer impact on management levels, (2) perceived computer impact on the traditional functions of management, (3) perceived computer impact on levels and functions of management (interaction).

Support was provided for hypothesis of …

Development Of New Products Involving Various Uncertainties For Success, Manuel J. Senra

Theses

The development of new products is a very important task for any company, since the survival of most of the companies depends on their ability to introduce new products on the market. This is not, by all means, an easy task; it is seen from the large number of unsuccessful new products reported.

It is been proved that out of every ten products which emerge from Research and Development(R & D), only two become successes. For reasons like the one mentioned and because larger and larger funds are allocated to R & D, it is a very important task to …

Development Of Robotic Arm Models Using The Integrated Mechanisms Program, Mohan J. Somnay

Theses

The purpose of this thesis is to study the broad concepts and applications of robots in industry and to evaluate the Integrated Mechanisms Program (IMP) for the development of models to suit the requirements of an industrial robot.

IMP is a programmed system for the computer-aided-design and analysis of mechanisms. The use of IMP to analyse and design mechanisms is done through a related problem oriented language which allows a variety of joints to be used.

This thesis describes a general procedure for designing robotic arms. Two mechanisms are modelled using IMP; the first is a jointed arm robot executing …