Engineering Commons^™

The Design, Manufacture And Mechanical Analysis Of An L4-5 Spinal Disc Prosthesis, Bohdan A. Siryi

Theses

The purpose of this research was to develop an intervertebral disc prosthesis which can provide the biomechanical properties of the natural disc. The prosthesis will be used to replace the symptomatic degenerated disc and thereby limit backpain and subsequent spinal disease.

Four cadaveric L4-5 motion segments were mechanically tested under axial compression and combined compression/torsion, generating compressive moduli and torsional stiffness values. Following, prosthetic discs were fabricated and mechanically tested, with the fabrication technique directed towards the optimization of mechanical properties in compression, torsion and bending.

Thirty silicon rubber and forty five polyurethane disc prostheses were fabricated. Silicon rubber, dacron …

Investigation Of High Shear-Rate Viscoelastic Flow, Sudarshan S. Sood

Theses

The object of this study is to understand two important characteristics exhibited by viscoelastic fluids at high shear-rates, and analyse their influence on practical applications Viscoelastic fluids, such as polymer solutions, when subjected to high shear stress, behave in a manner which has not been sufficiently analytically explained In experimental studies, such fluids have shown.

(a) Stress relaxation.

(b) Decrease of viscosity with an increase in shear rate.

(c) Slight decrease of viscosity with temperature.

(d) Normal stress differences in shear flow.

In this thesis an analytical explanation is given for two (a and b ) of these features This …

Analysis And Simulation Of Chirp Radar System, Tina Tsung Tsai

Theses

This paper consists of a technique to design a Chirp radar system and proposes a solution to optimize the design of the linear time delay network required in such systems. A Chirp radar system has a wide bandwidth for high range resolution, and long pulse duration for high velocity resolution and high transmitted energy. The technique of a pulse compression system offers a means of increasing the average power available to illuminate radar targets without any loss of the resolution at the receiver needed for the tactical requirements of the system. This is accomplished by transmitting a wide pulse in …

Friedman's Model Of Calculating The Optimum Bid Price Using Dbase Iii Plus, Selim Uzel

Theses

The micro-computer program, BIDCALC presented in this thesis is offered as simple, practical, and proven approach to developing an effective data-based competitive bidding strategy. BIDCALC is written in dBASE III Plus programming language for MS-DOS based computers.

Main purpose of the program is to evaluate the optimum bid using the Friedman's model of Maximizing the Expected Profit. At the same time the program keeps track of necessary competitor and project information in data base files which are easily transferable to other software packages. The program is capable of generating a variety of reports in a matter of seconds.

BIDCALC is …

Cmos Sram Design For Initializing Programmable Logic Devices, Ravi K. Vaidyanathan

Theses

This thesis presents the design of CMOS Static Random Access Memory (SRAM) which is imbedded within a high performance Programmable Logic Device (PLD). The SRAM and its control circuitry are used to initialize (or personalize) the NJIT PLD chip. The design is defined in 3-levels of functional hierarchy consistent with the physical and electronic design automation utilized for this design. The imbedded SRAM supports the PLD application circuit which includes 8 small Array and one large Control Programmable Logic Arrays.

The SRAM is structured as 64 X 138 bit array with serial read and write inputs. It is designed emphasizing …

Automatic Generation Of Robot Paths For Waterjet Cutting From Autocad Drawings, Samir Vij

Theses

The automatic generation of robot paths for a commercial water-jet cutting system by establishing a link with a commercial CAD system, in an attempt to achieve paper-less manufacturing and to minimize human interface is the objective of this thesis.

Water-jet cutting is an emerging technology with unlimited potential for a wide variety of manufacturing applications. Water-jet cutting systems integrated with robotic work cells allow the user to cut a variety of parts through part programs generated for robot controllers. The system employed is an Ingersoll-Rand water-jet cutting system, the movement of which is controlled by an Allen-Bradley 8200R programmable robot …

Investigation Of The Characteristics Of The Kerf And The Surface Generated In The Course Of Cutting Titanium With Abrasive Waterjets, Ajay Vora

Theses

The effect of cutting parameters on the quality of cut in the course of cutting Titanium (Gr.2) with Abrasive Waterjet is investigated. The cutting parameters include nozzle traverse rate, size and feed rate of abrasives and nozzle(s) diameter. The width of kerf (top and bottom ), taper and roughness is studied. The measurements are tabulated and plots are made to study the trend and relationship for each set of parameters.

The qualitative conclusions are made successfully but no quantitative relationship was derived. Suggestions are made for the evaluation of technology for feasibility and economic justification, and to achieve desired cutting …

Attenuation Properties Of An Lp 11 Mode In A W-Type Fiber Operating Below Cutoff, Chih-Chiang Wang

Theses

Rigorous formulation of a W-type fiber for its dispersion properties is presented. An LP mode has been studies extensively with respect to its attenuation properties when the frequency of operation is kept below cut-off. Due to rigorous dispersion equation numerical difficulties encountered in the computations, an approximate dispersion equation corresponding to weakly guided modes is solved. Numerical results corresponding to attenuation and propagation characteristics of the W-type fiber for radii and refractive index variations are presented. A computational subroutine for radial functions (Bessel, etc ) for complex argument has been used and proved to be useful in the legion of …

Research, Development, And Evaluation Of A Solid State Transformer, Robert Michael Joseph Wozniak

Theses

The analysis and design of a solid state step down transformer is presented as part of a research study which reviews novel approaches to the development of high frequency power magnetic apparatuses and applies available theory to produce a solid state counter part. The resulting circuit exhibits the potential for efficiency as high as 85%, low output ripple, regulation that is comparable with other modes of power conversion and the ability to provide localized on-board power.

Schema Based Wiring Tool : A Computer Network And Cad Design System, Jia Jing Zhang

Theses

For the purpose of building a SBC-8052-Basic micro-controller based instrument system, a new SCHEMA II Computer Aided Design system for IBM-PC is used to enhance circuits design routine, and it is described here. The new features of this CAD are discussed, and the design example of a new version of the SBC-8052-Basic micro-controller is given here in detail.

Since the wiring board system is adopted as tool of the laboratory development and controlled by the QL microcomputer, and since SCHEMA II CAD, on the other hand, is used on the IBM-PC-AT, communication between the two microcomputers is accomplished, and the …

On-Line Blood Glucose Control System, Huan Zheng

Theses

A method has been developed that can monitor and control the meal initiation of rats. The goal of studying meal initiation is to find a mechanism of control of the diet, based upon the assumption that the body weight is closely related to feeding behavior. If the feeding behavior can be controlled, then the body weight can be controlled. The experimental system has two major functions: (1) Continuous measurement and recording of the blood glucose concentration and meal pattern of rats. (2) Automatic or manual infusing of glucose or other substances to the rats intravenously.

For blood glucose concentration and …

Comparative Energy Analysis Of An Office Building Using A Microcomputeromparative Energy Analysis Of An Office Building Using A Microcomputer, Dale Krasnoff Bromberg

Theses

An energy analysis was performed on an office building using two different software packages - ASEAM and Trakload. The structure studied was the P.S.E. & G. headquarters in Newark, N.J.. The results of various parametric runs were compared. Then results from one of the programs were compared with results of a study carried out by Tishman Research Corporation and Jaros, Baum & Bolles, consulting engineers.

Although the two software products had variations in input requirements, overall the results of the two programs were similar. The overall deviation for total energy consumption between the two programs was between 3% and 15%. …

C/Ku Band Satellite Television Reception System, Costas A. Economides

Theses

The purpose of this thesis is to examine and investigate the design of a satellite reception system able to receive most C and Ku band North American geostationary satellites' TV transmissions. The performance criterion used for the system design is based on a required demodulated video signal-to-noise ratio maintained for a specified percentage of time in conjunction with overall cost considerations.

Furthermore, a computer program written in FORTRAN 77 is developed, which among other functions lists the notified, operational, geostationary satellites in sight with their corresponding look angles, from any given location on the earth.

Determination Of Polycyclic Aromatic Hydrocarbons From Incineration Emission Samples, Robert Cebula

Theses

Stack emissions from five sources (one pulverized coal combustion operation, three sewage sludge incineration operations and one gray tin refractory operation) were sampled by use of U.S. EPA Modified Method 5 isokinetic sampling unit for vapor and particulate effluent. The sampling unit provided XAD-2 resin samples, polytetrafluoroethylene and glass fiber filters and impinger washings of dichloromethane. The resins were soxhlet extracted using dichloromethane (DCM) and the filters were soxhlet extracted using DCM followed by acetone. Fractionation of extracts was accomplished by thin layer chromatography. The resulting fractions were analyzed for polycyclic aromatic hydrocarbons (PAH), nitro-PAH and quinone-PAH by high-performance liquid …

A Model For The Determination Of Market Based Pricing Of Telecommunication Products, Katherine J. Sullivan

Theses

The deregulation of AT&T, has impacted telecommunication product pricing in the U.S. market. Previously, pricing had been based on cost plus mark-up, as stipulated by regulatory commissions. Now, pricing decisions require consideration of the competitive impact, consumer demand for the product, corporate pricing objectives and marketing strategies. This paper proposes a pricing process that is relevant for this new environment which enables the product manager to price properly.

The method proposed utilizes microeconomic theory and takes into account the product test price, unit cost, opportunity cost, nonprice factor cost and consumer demand. Incorporating a number of different pricing strategies, it …

Design Of A Fiber Optic Oxygen Sensor Based On Immobilized Hemoglobin, Mendu Govind Raj

Theses

The fiber optic Oxygen sensor consists of a thin layer of immobilized deoxyhemoglobin at the common end of a bifurcated fiber. Immobilization is done using the alginate gel procedure. The immobilized reagent is separated from the standard oxygen sample by the gel with or without semi-permeable membrane, and the entire configuration is enclosed in an oxygen free sample cell. Light from a tungsten-halogen lamp, filtered through a 405nm filter is passed through one arm of a bifurcated fiber to the sample cell. The reflected intensity (a highly polished aluminum foil or a plate is placed at the bottom of the …

Comparison Of Various Techniques For The Detection Of Lines In 2-Dimensional Images, Somayajulu Bhamidipati

Theses

The detection of straight lines in 2-dimensional images leading to polygonal approximation to the boundaries of the objects is one of the important stages in scene analysis as it leads to the description of the images. The comparison of three diverse approaches for this problem in terms of the efficiency and accuracy is made, and their performance for different types of data and different sets of parameters is studied in this thesis.

The data points are generated using either an edge detection algorithm using chain encoding on real images or a synthetic data generator, which can create a variety of …

Ibm/Xt-Based Automatic Monitoring Instrumentation System For Eating Behavior Studies In Rats, Binghong Gui

Theses

An auto-feeding system based on the IBM-XT microcomputer has been designed for use in the anti-obesity research program in the Pharmacology Department at Hoffmann-La Roche Inc. By using this system, experimental rats can be automatically fed, some which have been given anti-obesity drugs and some which have not. The system can also collect data, such as eating times and food intake, which are used for studying the rat's eating behavior.

The system is designed to control thirty six cages with one experimental rat in each cage and it performs three functions:

1 ) To automatically dispense a preset quantity of …

The Application Of Zero-Sum Games To Low Sensitivity Optimal Control, Jun Huang

Theses

This thesis deals with the synthesis of low sensitivity optimal control systems. Zero-Sum games are applied to the first order linear differential equation system. The goal is to obtain an optimal control of the system performance, and at the same time, reduce the sensitivity of the performance index and sensitivity trajectory.

In this thesis, the quadratic index of performance is selected in the argumented system which is combined/ the system equation with the sensitivity equation. Two control variables U & V are selected to maximize and minimize the system, in order to obtain the optimal value of the system.

Two …

A Dynamic Set-Based Multiaccess Protocol For Local Area Networks, Parul S. Nanavati

Theses

The packet-broadcasting technique brings together the advantages of both packet switching and broadcast communication. The central problem of a packet broadcast network is conflict resolution among the users sharing the broadcast communication link. Collisions are the major source of transmission errors which degrade the performance of a LAN. Proposed here is a novel multiaccess protocol which offers full communication resources to the user at low traffic requirements. It dynamically adjusts the number of users allowed to access the medium at heavy traffic requirements such that number of collisions are reduced and thus maintains the efficient utilization of the medium and …

Reliability Problems In Semiconductor Lasers, Ajay R. Patel

Theses

The stability and reliability of semiconductor laser is dependent on its design, fabrication, and output power. The best way to assure high reliability of these devices is by accelerated aging test and by selection of strict and meaningful criteria for the acceptance or rejection of a particular device. In this thesis emphasis is given on different failure mechanisms that are known. As new development takes place, other mechanisms may be found. Catastrophic degradation, gradual degradation, darkline defects, and contamination during the fabrication process are the main source of device failure.

The noise generation and the packaging issue of semiconductor laser …

Microprocessor Testing And Computer Aided Diagnosability Of Digital Circuits, Shirish Patel

Theses

Computer Aided Diagnosability Of Circuits (CADOC), a new method is developed for isolating and pin-pointing a faulty device in digital circuits. CADOC is based on graph-theoretic principle and PFD numbers. Without considering any SA1 or SAO faults, we can zoom out faulty device by selecting different diagnostic path to narrow down the faulty region and to isolate the faulty device. The efficiency of this new technique is confirmed by applying the technique to many examples.

Reliability Evaluation Of Liquid Crystal Displays Under Accelerated Test Conditions, Ishatdev Singh Rathore

Theses

This thesis deals with the recent study of reliability of liquid crystal displays. This study determined the effects of high temperature on LCD reliability. To accomplish this, reliability life testing was done on different kinds of LCD samples under different operating conditions. The tests were carried out on the samples of two different vendors at two different temperatures. No humidity was added in any test.

Vendor No. 1

1. 120 units at 77° ± l° C.

2. 80 units at 85° ± 1° C.

Vendor No. 2

1. 60 hard and 60 soft glass units at 77° ± 1°C.

2. …

Sorption Characteristics And Their Effects On Geotechnical Properties Of Clay Soils, Arambawattage Mahendra Rodrigo

Theses

An experimental investigation on the sorption characteristics of clay soils with liquid organics (phenol, chlorophenol, nitrophenol and chlorobenzene) and their effects upon geotechnical properties was undertaken. The investigation consisted of two different phases, namely, (1) the sorption/ desorption study, including kinetic rate, equilibrium time, isotherm modeling, and (2) geotechnical properties due to clay/ liquid organic interactions. The results of kinetic rate study indicate that the equilibration time for the contaminants way dependent upon the hydrophobic or the hydrophelic nature of the chemical. For equilibrium adsorption models, the linear isotherm was found to be the best fit in predicting sorption capacities …

Study Of Dynamic Cmos Families And Development Of Certain Guidelines For Logic Synthesis, Vinay Santurkar

Theses

This work studies in detail two dynamic logic families, namely Zipper and Nora. It compares their performance using SPICE, a popular circuit simulator. Results show that a novel clocking scheme and a different latch circuit for the Nora pipelined structure can push its maximum clock rate of CMOS Dynamic circuits higher. It also ascertains whether the increased complexity of NORA is justified compared to the simpler Zipper circuit. It is shown that for very long logic chains, Nora works faster than Zipper. The work also presents some guidelines for synthesis of logic functions using CMOS Dynamic Cells. It shows that …

Analysis Of Spread Spectrum System Using Direct Sequence Technique In Jamming Environment, Kandarp A. Vyas

Theses

A spread spectrum system is a means of transmitting data over a channel In addition it offers a wide variety of features like data security and signal hiding This work studies in detail a spread spectrum system using direct sequence binary phase shift keying. The Sliding Correlator and Sequential Detector techniques have been used to achieve synchronization. A brief study of pseudorandom noise has been presented. System was simulated on UNIX using 'c'. A modified version, suitable for software implementation, of Sliding Correlator and Sequential Detector was, used. Results generated using tins model are presented here.

The State And Future Of Televised Professional Training Systems, Robert Michael Brady

Theses

This paper investigates the topic of televised professional training -- that is training and educating managers and technical professionals via live or videotaped television broadcasts. The investigation begins with a description of how some typical educational networks operate; it then goes on to analyze in a strictly theoretical sense, some of the advantages and disadvantages that such a system would have compared with the traditional methods of offering continuing education; it then discusses the results of two specially prepared surveys -- one addressed to the administrator/manager, and one addressed to the student. These areas are then united in a final …

A Dynamic Model Of A Fill-And-Draw Reactor And Its Implications For Hazardous Waste Treatment, Shing-Hwa Chang

Theses

A dynamic model of a fill-and-draw reactor has been developed, which includes a number of operational parameters such as the draw-down volume, the fraction of total cycle time devoted to fill, reaction, and draw, and the concentration of the toxic substance in the feed to the reactor. The model has been solved numerically for two cases, one assuming Monod kinetics, and one considering substrate inhibition (Andrews kinetics).

The conversions achieved with this type of reactor have been compared to that of a conventional activated sludge (CSTR) design. These results indicate that for most practical settings of the operating parameters, the …

Temperature Dependent Reliability Of Plastic Packaged Microcircuits, Wasim Ahmed

Theses

Increasing power and power densities in new high complexity semiconductor devices are creating heat removal problems. Increased powers produce higher junction temperature which lead to potentially faster degradation of device reliability. Thermal management at device level packaging involves efficient and cost-effective removal of dissipated thermal energy from the device to assure its reliable performance over the long term. In the context of very high levels of integeration of future ICs, thermal management will mean making such devices possible close to the limits of acceptable high temperature.

The major factors affecting heat flow in a plastic Dual-in-line-packages (DIP'S) are investigated using …

An Investigation Of Interrupt Handling Schemes In Pipeline Processors, Shailesh Ratilal Gami

Theses

In order to acheive higher performance in a pipeline processor, proper interrupt handling is essential. In a pipeline processor, interrupt handling is difficult because many instructions are in the processor at the same time. This study describes and evaluates the different solutions to interrupt handling. Several pipelined 32-bit microprocessors have also been studied and their architectural and programming features are compared.