Electrical and Electronics Commons^™

Graphical Interpretation Of U.S. Tidal Data, Vaheh Shahbazian

Theses

Numerous Shore line operations relating to industry and conservation would benefit from convenient access to continuous tidal predictions. Easy Graphical access to continuous long term predictions of tidal heights at a location of interest will simplify operations that are sensetive to tidal predictions. A specific example, is the implementation of a protective measurements against flooding and destruction of shoreline facilities particularly at times of high tides.

This thesis consists of three things. First, rendering NOAA's data in a form accessable to a PC user. Second, it provides a Basic program for prediction of tides. Third , PC user programming Resourses …

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 …

A Cad Tool For Edif Model Generation, Sri Nagesh Valluri

Theses

This thesis describes a new CAD tool designed to create models proposed by Electronic Design Interchange Format steering committee. In its present form the system can generate models for standard SSI and MSI devices. The menu driven window based fillup the form features of the tool allows a novice user to provide structural and timing informations of the device from any manufacture's data book. The software performs online checking of the user data and guides them to generate the correct model.

Implementation Of Xilinx Development System And Xilinx Lca Application, Youcheng Wu

Theses

The Xilinx Application-Specific Integrated Circuit (ASIC) is a large array of programmable logic cells. Creating logic design using the Xilinx ASIC offers ease of implementation, high function density, design flexibility and lower consumption of supply power. The techniques of implementation of system and design with Xilinx CAD/CAM System include system analysis, modification, update, optimal design algorithms and real circuit emulation.

This thesis combines the setup and operation of the complete Xilinx system, and implement Xilinx LCA into 8052AH-BASIC based Single Board Computer and user's menu of real LCA chip evaluation Board. It presents our own design, construction, test and demonstration …

Xilinx Asic Design For A Single Board Computer, Hong Zhan Ye

Theses

Xilinx Application-Specific IC is a new kind of programmable cell array with high design flexibility and functional density. It not only has excellent circuit-board utilization and low power consumption, but it also offers easy implementation with lower engineering cost and very short production-rampup period.

This thesis provides a complete and specific procedure for implementing Xilinx LCA into a 8052AH-BASIC based single board computer with XACT development system. It verifies all the results from debugging SBC2064 design using both XACT query system and P-SILOS simulator.

The technology of implementing a whole system design with software and hardware fully proves the possibility …

The Study Of The Response Of Nucleus Ambiguus Neurons To Blood Pressure Changes, Adrienne Zoe

Theses

The purpose of the project is to aid the study of the response of nucleus ambiguus neurons to changes in blood pressure. The sampling runs indicate that there is a correlation between blood pressure and neuron activity for some of the neurons monitored. Some neurons react to blood pressure increases by Increased neural firing rate while others react by decreased neural firing rate. Some neurons do not respond to blood pressure manipulation comprising the non-vagal neurons. A system was developed for the DIN PC to collect electrocardiogram, blood pressure, and neuron activity from a dog, and to perform non-real time …

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 …

Modeling And Simulation Studies On Nmos Vlsi, Chang-Joo Kim

Theses

This thesis has two parts. The first part deals with the theoretical analysis and experimental verification of the variation of channel resistance and threshold voltage as a function of drain and source voltages in NMOS transistor with the substrate taken as reference. And the second part deals with simulation and optimization of the NMOS sense amplifier circuits.

Firstly, the NMOS transistor with the substrate taken as reference node is analysed and a set of formulas is derived for the variation of channel resistance as a function of the terminal voltages. Experimental results (using SCL 4007AE from Signetics) show good agreement …

The Design And Fabrication Of Dielectric Waveguides For Use With High Power Carbon Dioxide Lasers At 10.6 Microns, Jong Min Kim

Theses

The feasibility of constructing a feasible transission system to propagate 10.6 microns energy from a CO₂ laser is explored. The system is to be used in a clinical surgical setting to deliver as much as 100 watts of CW power from a surgical CO₂. laser to a surgical target.

The optimal transmission system is a slender flexible cylindrical structure, 1 mm in diameter and 1.5 m long. The structure should be sufficiently flexible to be bent into a 5 to 10 cm radius without a significant increase in the attenuation constant. For clinical applications the system must …

Digital Signal Processing Implementing The C Language With Graphics Spectrum Analysis Display, Anuraksa Mahanirananda

Theses

Digital Signal Processing discussed in this thesis is concerned with the transformation of signals or complex wave forms From time domain to frequency domain and vise-versa, implemented on microcomputer systems. The primary principles are: speed of transformation, ease of usage as an application program, capabilities of graphics displaying transformed data (such as power spectrum analysis), storing these data onto record files, and capability of using these data Files and programs with other application programs.

We begin by discussing briefly, the concepts of Fourier theory, Discrete and Fast Fourier Transform, algorithms of Fast Fourier Transform and bit-reversal. Then we implement these …

Microcomputer-Based Automated Feeding And Monitoring System For Eating Behavior Studies On Rats, Tseng-Huang Shih

Theses

An instrumentation system has been designed to monitor feeding behavioral experiments on rats. This instrumentation system is capable of performing these experiments in an automated manner without any human intervention. It is capable of monitoring these experiments concurrently in six cages. It exhibits several features that make it more versatile than previous feeding & monitoring systems. It is also capable of storing the data generated on to a floppy disk and later printing out the data for analysis.

Another feature that makes it more versatile is the flexibility of the system. Construction of a parameter file before doing the experiment …

Logic Simulation And Methodologies For Design For Testability, Ravi Shankar Prasad Mallampalli

Theses

This thesis describes the method used for developing the standard TTL blocks using the logic simulator SPLICE1. It also gives a comprehensive overview of methods which can be used for designing a circuit which is testable. A format called Electronic Design Interchange Format (EDIF) is also described as a tool which can be used for transporting design data in the VLSI indgstry.

Multi-H Continuous Phase Modulation : Its Properties And Analysis, Jyung-Cheng Chen

Theses

Multi-h CPM, a generalization of CPFSK and also one of the so-called Combined Modulation and Coding schemes, is useful in digital communication systems where both the bandwidth and power are constrained. The increased signal processing complexity, which can be viewed as the third communication resource, is used to trade for both power and bandwidth, and to approach the error-free communication promised by Shannon's theorem.

The transmitted multi-h CPM signal carries a coded sequence of continuous phase changes; the possible phase states form a cylindrical trellis in phase and time, in which the modulation indices are reused in a cyclical fashion. …

Gallium Film Formation By Ion Cluster Beam Deposition, Te-Chuan Hsu

Theses

Gallium thin films were deposited by Ion Cluster Beam (ICB) from pure gallium. This research had two objectives: to develop a practical method of crucible heating to generate gallium clusters; and to investigate the influence of ICB system parameters on the formation of clusters and film properties. An electron-bombardment crucible heater with a novel construction was designed. The top section of the carbon crucible was kept at a higher temperature than the middle section to prevent clogging of the nozzle and " spitting " phenomena which were found to occur with the conventional design. Crucible temperatures up to about 1360°C …

Reliability Of Dielectrics : Using Noise As A Diagnostic Tool, Ramesh K. Jain

Theses

The aim of this thesis is to develop a screening method to predict the reliability of a dielectric material. The screen chosen is an electrical noise. The dielectric material studied is varnished fibre glass cloth material supplied by Westinghouse Electric Corporation.

The dielectric material will have varying amount of voids, crystal defects, and surface contaminants impurities introduced during manufacturing process. On application of the electric stress, ionization (corona) will take place. The corona degrades the material due to thermally generated heat, chemical reactions in the voids and ionic bombardment of the material.

An experimental set up is developed to monitor …

The Modeling Of A Self-Oscillating Dc-To-Dc Converter, Frank Andrew Linkowsky

Theses

This thesis develops a model of a nonlinear self oscillating current-or-voltage step-up dc-to-dc converter. Expressions are given that predict the operation of the converter in the time domain and in the state plane. To verify these expressions, a large signal computer simulation technique [1] is used to compare theoretical results with actual measurements. This type of simulation allows a nonlinear switching converter to be modeled with a series of piecewise-linear operating intervals. The resulting waveforms predicted by the developed model show close agreement with waveforms found in the laboratory. Therefore, the model represents a powerful tool that may be used …

On-Line Analysis Of Highly Coherent Brain Activity During Transcendental Meditation And Automated Biofeedback, Deepak Dinkerrai Rawal

Theses

Occurance of highly coherent brain activity (EEG) specific to the meditation has been reported in the literature. The present thesis is an effort to look into the mechanics of meditation using the recent technique of analysis of high coherence in the EEG. Based on previous work, reporting increased EEG coherence during practice of Transcendental Meditation, a closed loop model and hypothesis is proposed using biofeedback to close the loop. The hypothesis proposes that very high coherence in the EEG is a very significant neurophysiological parameter, reflecting instantaneous quality of meditation in the form of an average high coherence above threshold. …

Effect Of Humidity And Moderate Temperature On Microcircuit Failure, Antoine Mikhayel Chaia

Theses

The increased use of microprocessors has brought forth many questions concerning the reliability of these devices.

This research discuss the TTL integrated circuit failure rates, and provides information on the effects of temperature, device complexity and packaging on TTL failure rates under storage condition of 100% R.H. (Relative Humidity) and 100°C and no added humidity at 100°C. Other factors which can affect failure rate are also discussed, including designs, materials process.

Approximately 200 microcircuits of TTL (74LS00) were subjected to extend life testing at 100°C; where 125 chips are tested at 100°C ± 2° and no added humidity and the …

Ray And Beam Representation Of The Glancing Phenomena, Michael Sotiriou Vogas

Theses

Asymptotic ray theory (ART) is a widely used method dealing with problems of wave propagation in an inhomogeneous medium. The main deficiency of ART is in transition regions where rays near caustics, glancing and critical incidence fail to represent the actual wave field. Ray bundles in such transition regions have been successfully replaced with modal bundles and remainders El] in well defined profiles. However , in practical problems it is difficult to implement modal representations and almost impossible to express remainders. Recently emerging Gaussian beam method (GBM) has shown promising results in representing the total field produced by a source …

Design And Evaluation Of Performance For The Multi-Microprocessor System, Sang-Soo Lee

Theses

A tightly coupled multiple-microprocessor with two MPU's that can be run at different clock speeds has been built and tested. The method of interconnection for this multiprocessor is a timeshared common bus with shared memories having a tightly coupled architecture. The signal timipg of the multiprocessor system for different speeds has been investigated using a logic analyzer for simulation modeling. The desired timing results have been obtained. According to the timing results, the simulation model for the General Purpose Simulation System has been correctly designed and performance of the multiprocessor system for the various clock speeds has been evaluated by …

Measurements Of Basic Semiconductor Properties, Abdolreza Ariantaj

Theses

Mobility, resistivity, and total impurity concentration of several purchased p-type silicon samples with known resistivities were measured by Hall effect, experiments utilizing the Van Der Pauw method. The silicon samples will serve as Hall effect standards for future measurements on other semiconductor materials, particularly gallium nitride ion cluster beam (ICB) deposited thin films. The samples which were Freshly etched with hydrofluoric acid had measurement values of 455 cm ² / V.sec, 45.9 Ω cm, and 2.6 X 10¹⁴ cm³ for mobility, resistivity, and total impurity concentration, respectively. The mobility values were within 9.9 per cent, of the published values …

The Acquisition Of Direct Sequence Spread Spectrum Communication Systems, Anthony Donald Demeri

Theses

This Paper surveys different techniques of acquiring Direct Sequence Spread Spectrum Systems.

It classifies different systems, indicates the strongpoints and weakness of each, along with some applications.

One method, The Single Dwell Serial PN Acquisition System is then focused on in detail. The detail includes analysis of standard version, derivation of the mean time to acquire, the variance, the probability of detection and the probability of a false alarm.

In the last section of the paper the analytical results of the Single Dwell Serial PN Acquisition System shall be confirmed by computer simulation.

Reliability Studies On Solid Tantalum Electrolytic Capacitors By Means Of Accelerated Life Tests, Venkata R. Golthi

Theses

The purpose of this thesis is to understand the failure mechanisms in Solid Tantalum Capacitors encapsulated in plastic, and to suggest the precautionary measures that prevent the occurrence of these failures.

The reliability of Solid Tantalum Capacitors encapsulated in plastic is of considerable interest because in some applications where the mechanical accelerations or shocks are considerable the "better" "hermitically" sealed type are not able to sustain themselves. Poor adherence between the dielectric film and the base metal Tantalum under the conditions of sudden mechanical shocks, causes problems.

Our study was carried out in two different directions, theoretical and experimental. The …

Nervous System Simulation, Jian Chen

Theses

This thesis deals with the nervous system simulation. The Hodgkin-Huxley model and Stein's model are used as basic tools. The author has tried to describe some practical problems by mathematical models.

First, the horse-shoe crab eye is investigated. Light intensity is reported to the brain by the firing frequency of the photoreceptoe. A Poisson process is used to simulate the stimulus to the receptor. The result of the stochastic model coincides with the theoretical one: receptor overlapping decreases the resolving power of the eye; and the lateral inhibition compensates the effect of overlapping.

Second, a nerve muscle model was set …

Realization And Implementation Of A Recursive Digital Convolution Algorithm In Cmos, Lik Tang Cheng

Theses

This thesis describes the implementation of a digital convolver. A recursive digital convolution algorithm was realised and implemented by using CMOS circuitry. This thesis also gives a technical overview of current CMOS processing technologies as well as various novel CMOS logic circuit techniques.

Waveform Analysis Using A Micro Computer, Dakshina K. Murthy

Theses

Harmonic analysis through a micro computer was performed at Brookhaven National laboratory to determine the magnitude and extent of hormonic dIstortionon in their electrical power supply system. DT 2801 Hardware and MADCAP software were used to accomplish the Harmonic anylysis through forier transform.

The Dielectric Slab-Wedge Antenna, B. Keith Christensen

Theses

A theoretical model and numerical investigation of the directive gain of a dielectric slab-wedge radiator is presented. The model is based on a union of the classical dielectric slab equations, local mode theory, and equivalent current distribution treatments of the truncated dielectric slab and wedge geometries.

The far field is developed from the sum of two current distributions. The slab region, up to the transition plane between slab and wedge, is replaced by equivalent electric and magnetic surface current densities. The wedge contribution is developed from a volume polarization current distribution.

Conservation of power is used to approximate the field …

Computer-Aided Design Of A Waveguide To A Suspended Stripline Transition For Millimeter-Wave Applications, Hsin-Yen Peng

Theses

Realization of millimeter-wave systems on suspended striplines necessitates transitions from such lines into waveguides for measurements and other purposes. Transition can be obtained through coupling TE10 mode in the waveguide into a TEM mode in the suspended stripline. A continuous transition using tapered complementary unilateral finline and two gradually increasing conducting tapered ridges is studied here. The tapered region is modelled using a number of uniform sections with gradually changing cross sections. The junction separating the tapered section from the suspended stripline is modelled via physically and electrically continuous terminations. Physical continuity approach is more flexible for manufacturing purpose at …