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Study Of Ionized Cluster Beam Techniques For Reactive Deposition Of Gallium Nitride Thin Films, Jyh Sheen

Theses

This thesis is divided into two parts. The first part investigates the Ionized Cluster Beam( ICB ) technique through measurements of the energy of ionized gallium beam. The presence of ions and their kinetic energy in the ICB technique is advantageous in the formation process of thin film. The results of retarding potential measurement are comparable with the presence of clusters as large as 500 atoms. The second part examines the formation of gallium nitride thin film. In order to enhance the reaction of gallium and nitrogen, dissociation of molecular nitrogen by microwave discharge method was used to generate atomic …

Firmware Toolkit For Larynx Synchronous D.S.P., Shih-Chieh Su

Theses

During the past ten years, digital signal processing has been an extremely active and dynamic field. Advances in integrated circuit technology and in processor architecture have greatly enlarged the scope of the technical areas to which digital signal processing techniques can be applied. Research in fundamental signal processing techniques and algorithms has led to dramatic improvements in the efficiency of signal processing systems.

This thesis creates a fast and cheap DSP package for 8052AH-BASIC. This is a useful and potential package when we apply research in speech science and medical diagnostics. It exploits the latest software-in-silicon technology to create a …

Optimal Design Of Prestressed Concrete Members Using Numerical Techniques, Nasseruddin Syed

Theses

This research consists of the application of nonlinear optimization techniques for the economical design of prestressed concrete members. A computer program using Lattice and Matrix methods of optimization is employed for least weight design of I-shaped prestressed concrete girders. The program calculates the most optimum values of the cross-sectional dimensions.It has the freedom to impose any constraints on any of the design variables, including sectional dimensions, eccentricities, concrete cover and limiting stresses.

Comparison of results obtained in this thesis with other analytical methods indicate that with the advent of computers, the numerical methods have a definite advantage over other analytical …

Spectrum Analysis Of Heart Rate Variability, Xuming Wang

Theses

This research investigated the respiratory influence on heart rate variability. The heart rate spectrum was obtained from the heart rate variability signal which was extracted from the electrocardiogram We then studied the magnitude of the respiration peak in the heart rate spectrum and examined the dependence of the magnitude of this peak on breathing frequency, subject and day.

An experiment designed to simultaneously acquire the electrocardiogram and the respiration signal was conducted on ten people ranging from 22 to 55 years of age (3 females, 7 males). Three tests were performed on each subject. In each test, 2 different postures …

Thermal Desorption Of Hazardous And Toxic Organic Compounds, Manuel S. Nolau

Theses

The purpose of this thesis is to study the thermal desorption behavior of toxic organic compounds, specifically o-xylene, p-xylene, ethyl benzene, p-chlorotoluene, and anthracene, from soil with respect to temperature and time, and to develop a mathematical model that will describe this desorption behavior. The model will allow prediction of the concentration of an organic contaminant in commercial soil desorption system over time given a known set of parameters of the specific chemical as well as flow rate and temperature. For this purpose, two sets of experiments were done: These are identified as 1. Thermal desorption and 2. plug flow …

Study Of Steel-Concrete Interface Behavior Of Reinforced Concrete Members, Jun Wan

Theses

The main objective of this thesis work is to study the steel-concrete interface behavior of reinforced concrete members using the nonlinear finite element method.

The reinforced concrete member was modeled as a continuum consisting of plane stress rectangular elements which represent the concrete, pin-joint two node bar elements which represent the reinforcing steel, and the nondimensional linkage elements which represent the bond stress-slip, aggregate interaction and dowel action effects. The load increment procedure is employed to carry out the nonlinear analysis.

An axially loaded tensile specimen, a deep beam specimen and a shallow beam specimen were analyzed. The results from …

Environmental Assessment In Bioethanol Technology Using Immobilized Yeast Cells, Minoo Kandy Zarnegar

Theses

This study is undertaken from the standpoint of water pollution evaluation in bioethanol technology, using immobilized yeast cells. Evaluation of water pollution caused by immobilized yeast fermentation is the main objective of this research.

The pollution in water remaining at the end of ethanol production, which is normally discharged in the wastewater stream, has been analyzed by the measurement of biological oxygen demand (BOD), since BOD measurement is one of the widely used parameters for water pollution evaluation. BOD obtained from produced water (stillage) was between the range of 115- 360 mg/l. The variation in BOD depended upon the removal …

Thermodynamic And Leaching Studies Of Various Systems, Satya D. Rami

Theses

The group contribution approach is a reliable and fast method for the prediction of liquid phase activity coefficients in none lectrolyte, nonpolymeric mixtures at low to moderate pressures and temperatures between 300 and 425 K. It has become widely used in practical chemical engineering applications in cases where little or no relevant experimental information is available.

The two group contribution methods examined in the course of this work, are the Knox and & UNIFAC models. Group interaction parameters are evaluated for each of these models and results compared. Although the results for both models are similar when sufficient data are …

Use Of The Lms Algorithm In Ecg Analysis, Xiaohua Yang

Theses

The purpose of this thesis is to develop an IBM PC-AT based system to effectively process electrocardiogram (ECG) signals. Adaptive filter theory is used to implement a noise cancellation system (adaptive noise canceller), which adaptively cancels the ECG signals resulting in real ECG noise. The adaptive process is based on the well known least-mean square (LMS) algorithm.

The noise canceling system is software based. Several programs have been written, which include analog to digital converter control, data acquisition and storage, data retrieval, adaptive filtering and digitized data graphics.

The thesis presents numerous computer experiments. The performance of the adaptive noise …

Experimental Evaluation Of J-Integral For Concrete Subjected To Impact Loading, Naishan Zhang

Theses

This thesis presents an experimental evaluation of J-integral for concrete subjected to impact loading. Twenty four three-point bend specimens with two different thicknesses and mid-span notch lengths were tested under impact velocities of 167.22 in/sec (424.74 cm/sec) and 261.78 in/sec (664.92 cm/sec). Multi specimen method was used to analyze and estimate J_I and its critical J^-Ic values. Effects of specimen thickness and impact velocity on J^-Ic values were observed and discussed. Evaluation of J^-Ic Values from the experimental results of this study indicated that can be characterized as a material constant even under different impact velocities. …

Progressive Transmission Of Images Using Pyramidal Structure, Chin-Hua Hsu

Theses

A progressive image transmission scheme based upon Laplacian pyramid structure is used for image coding over low-bandwidth channels. The filtering and differential pulse code modulation (DPCM) methods of image coding are generalized to allow quantization of the Laplacian images. Filtering is performed with a local, symmetric weighting function. The three different quantizers, (1) scalar quantizer, (2) memoryless vector quantizer (VQ), and (3) finite state vector quantizer (FSVQ), are used here to compare the results. In the receiver end, the image can be reconstructed using reverse procedure. The reconstructed image is not the same as the original image because of the …

Graduate Catalog, 1989-1991, New Jersey Institute Of Technology, New Jersey Institute Of Technology

Course Catalogs

No abstract provided.

Hydrodynamic Lubrication Performance Of Mineral Oils With Polymer Additives, Moshe David Felzenstein

Theses

This study was undertaken with the view to determining experimentally the influence of polymer additives on journal bearing performance under static load. Viscoelastic lubricants such as oils with polymer additives are in common use and exhibit a reduced dependence of the viscosity on temperature but the effect on the performance of a static journal bearing is not clear. Additives of the polymer polyisobutylene and STP were blended with Newtonian base oil which was used to establish the baseline performance of the test bearing. A comparison was made between the performance of these blends and the base oil. The performance of …

Respiratory Impedances Computed From The Forced Oscillation Technique Using An Esophageal Balloon, Richard Thomas Fisler

Theses

The purpose of this investigation is to develop methodology for the standard measurement and physiological interpretation of lung resistance and compliance using non-invasive forced oscillations techniques and validating these results with standardized esophageal balloon techniques. Application of the forced oscillation technique with an esophageal balloon in place permits partitioning of the respiratory system into the pulmonary system which is of primary interest and the less clinically important chestwall system. Diseased lung states are induced in normal subjects by inhalation of a bronchoconstrictor. The total respiratory (pulmonary plus chest wall) and pulmonary impedances are interpreted using both a linear three element …

Three Dimensional Study Of Macromolecular Leakage Patterns Using Video Image Analysis, Nikhil V. Khimani

Theses

It has long been known that blood - tissue transport of macromolecules in the microcirculation is driven by diffusion. Although two dimensional models fit the experimental data well, the diffusion process is three dimensional.The objective of this research was to establish a three dimensional unsteady state mathematical model for intravascular transport of macromolecules, and suppoi t the theoretical establishment by experimental results.

Three dimensional diffusion of macromolecules through the interstitial space in the hamster cheek pouch was studied, with intravital fluorescence microscopy. After application of bradykinin, the movement of Fluorescein isothiocynate (F.I.T.C.) - labeled Dextrans of average molecular weight 150,000 …

Unsaturated Column Studies Of Silty Sand Using A Conservative Tracer, Canagasabapathy Nallianathan

Theses

A laboratory study was conducted to investigate the flow and mass transport of a conservative tracer in the unsaturated phase. For this purpose, a relatively "large-scale" cylindrical column(12 in. O.D. x 4 feet long) was fabricated and equipped with tensiometer and psychrometer sensors.

The soil used in the study was a New Jersey based silty sand compacted to an average dry density of 93 lb/ft³. The soil was permeated with a 0.5 M NaCl solution infiltrated at the top of the column using a perforated spiral tube assembly. The permeant was applied at a constant rate of approximately …

A Dynamic Model Of Fill-And-Draw Reactor Utilizing An Inhibitory Substrate, Yun-Fei Ko

Theses

A dynamic model of a fill-and-draw reactor has been developed, which includes a number of operational parameters, 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.

Operating diagrams have been generated, from which one can choose suitable operating parameters.

The model has been solved numerically for Andrews kinetics ( substrate inhibition ), and tested experimentally, using a 5-liter fill-and-draw reactor with phenol as sole carbon source and a pure culture of Pseudomonas putida. Results compared very well to the model predictions.

The Path Method In Power System State Estimation, Fareed A. R. Shirazi

Theses

A new method for Power System State Estimation (PSSE), the 'Path Method', is developed and studied. In this method the state (voltage magnitude and angle) of one node is calculated at a time, using only the local measurements. This procedure is repeated to calculate the state of all nodes in the system, following a predefined path to determine the next node whose state is to be calculated. In the process, more measurements are used whenever available and possible. Results obtained for this method are comparable and close to those of the Line-Flow Only (LFO) method. An advantage of the Path …

An Application Of Bit Level Systolic Arrays On Digitized Adaptive Array Processes, Shin-Hwa Tsai

Theses

This thesis has concentrated on some aspects of adaptive arrays, i.e., the data type as well as the calculating processes under an optimized version. An adaption of a modified bit-level array is described on the control structure for processes like correlation matrix, Q-R decomposition and solution of triangular linear systems. In short, an implementation of SMI(Sample Matrix Inversion) under a parallel systolic array process is consider5ed. Also an application of utilizing systolic array on a matrix inversion is derived. As a result, it could be predicted that a VLSI chip implementation for small adaptive arrays is feasible in the near …

Co-Metabolism Of Pentachlorophenol With Glucose Using Two-Stage Anaerobic Activated Carbon Fluidized Beds, Zen Wang

Theses

Abstract - Detoxification of pentachlorophenol by using a two-stage anaerobic biological activated carbon fluidized bed has been investigated. Glucose was introduced as a cosubstrate to determine the relationship between the glucose/PCP ratio and the extent of PCP detoxification in such a system. This system has been proved to be effective in the removal of both PCP and COD. Ratio of glucose to PCP predominates the performance of the system throughout the whole course of this experiment. At a glucose/PCP ratio of 0.33, the system has a highest reduction of both PCP and COD. Addition of glucose to the highly PCP …

Effects Of Compliance And Machining Prameters On Robotic Grinding/Deburring, Kung-Le Chang

Theses

A theoretical model for robotic grinding/deburring has been developed and compared with experimental results. Various grinding parameters such as depth of cut, feed rate, surface profile and roughness, grinding forces, and robot stiffness, have been experimentally investigated in this study. It was observed that the depth of cut is a function of specific grinding energy, force, and robot compliance. The observed roughness and waviness are directly proportional to depth of cut and feed rate and, in addition, to the robot compliance and the encoder quantization error. Other effects of the robot system for grinding performance are also addressed.

Decontamination Of Contaminated Clay Soils By Thermal Treatment, Chandrakanthi Weerasinghe

Theses

An experimental investigation on the desorption of contaminated clay soils by thermal treatment was performed. This study was carried out on two clay soils (kaolinite and bentonite) sorbed with three liquid organic compounds (phenol, chlorophenol, and chlorobenzene). The study consists of two different phases, the adsorption and desorption. The results on batch equilibrium adsorption were correlated with different isotherm models of which the Freundlich isotherm model was found to be best fit in predicting adsorption capacities of kaolinite, and that for bentonite was found to be the linear isotherm model.

A thermal desorption study followed the equilibrium adsorption study. A …

Degradation Of 1,2 - Dichlorobenzene And 1,2,4 - Trichlorobenzene In Water Using Ozone, Hydrogen Peroxide And Ultraviolet Radiation, Wei Jie Chen

Theses

The experiments to oxidize the refractory chemicals, 1,2 - dichlorobenzene and 1,2,4 - trichlorobenzene using ozone, hydrogen peroxide and ultraviolet radiation have been conducted in a photoreactor. The kinetic models for the oxidation processes have been proposed and the data obtained in the experiments was used to calculate the mass transfer coefficient and chemical reaction rate constants. The Rosenbrock Hillclimb optimization algorithm has been used to optimized the coefficient and rate constants to give the best fit to the experimental data. It is concluded that the H₂O₂/UV is the best process for the degradation of 1,2 …

Degradation Of Dichloromethane, Trichloromethane & Carbon Tetrachloride In A Photoreactor, Sanjay Wadhwa

Theses

A SS 304 photoreactor has been designed to study the degradation of EPA priority pollutants. This newly designed system was used to study the kinetics of degradation of dichloromethane, trichloromethane and carbon tetrachloride under O₂/UV, O₃/O₂/UV and H₂O₂/UV schemes. These compounds have been found to exhibit similar kinetics. The experimental data obtained was. analyzed for pollutant concentration using gas chromatography. The rate constants and mass transfer coefficients were found using a mathematical model to fit the experimental data. A computer program based on the Rosenbrock Hillclimb method in conjunction with …

An Automated System For Optimal Synthesis Of Planar Linkages, Daming Wang

Theses

This thesis addresses the fundamental weakness of the current CAD capabilities and develops a new CAD system with optimization capability. A computer-aided mechanism design system is developed for general problems of optimal kinematic synthesis of planar four-bar mechanisms. The new system is made as user-friendly as possible and it is unique in that it combines Graphics capability, general Analysis capabilities, and Optimization capability into one system. Related background theory in IMP, optimization and optimal synthesis of mechanisms are discussed. The problems and methods in developing the new system are addressed. New routines and modifications made to the original systems are …

Gas-Phase Reactions Of Methylene Chloride And Methylene Chloride-Trichloroethylene Mixture With Methane In Tubular Flow Reactor And Atmospheric Pressure, Javad Tavakoli-Attar

Dissertations

Reactions of methylene chloride diluted in methane and Argon and a mixture of methylene chloride + trichloroethylene diluted in methane and argon are studied in three flow reactors of different surface to volume ratios 4, 10.5, and 16 mm ID , atmospheric pressure and over a temperature range of 750-1000 °C. Experiments were conducted isothermally, ±5 °C over central 80% of oven length using a three zone oven. Argon was added as a diluent in order to limit carbon (s) formation. The concentration ratios of methylene chloride/methane/argon and methylene chloride/trichloroethylene/methane/argon was held constant at 1:4:10 and 1:1:40:40 respectively, throughout the …

Learning System, Bhavesh T. Adani

Theses

Many rule-based learning systems have been implemented which generate and update rules/facts from illustrative examples provided by the user. But very few of them have succeeded in achieving the efficiency and accuracy of an ideal system.

The approach made here is to continuously update the hierarchical structure of rules/facts of a knowledge-base so that efficient and accurate solutions to any query can be achieved easily and immediately from the many possible solutions to the query. As the rule-based systems deal with a very large knowledge-base, it is sometimes necessary to apply a learning technique that finds optimum solutions efficiently.

The …

An Intelligent Computerized Pulse-Duplicator For The In-Vitro Evaluation Of Prosthetic Heart Valves, John F. Andrews

Theses

A computerized data acquisition system is presented for the in-vitro determination of the hydrodynamic performance of prosthetic heart valves. High speed data acquisition and ensemble averaging techniques are employed to minimize error and provide a standard for data collection and analysis across a wide range of simulated physiologic conditions. Processing algorithms automatically divide the cardiac cycle into phases based on landmarks in the pressure and flow waveforms, with minimal variability and without operator intervention. The contributions of valve resistance, regurgitation, ejection, leakage, and power loss to hydrodynamic performance are isolated for investigation. Phasic power loss analysis is reviewed as a …

Waveform Analysis And Application To A Model Of The Egg Waveform, Eu-Rune Chang

Theses

The purpose of thesis is to describe and investigate a model of electroglottogram waveform. At the beginning, we generate a set of sine waveform models to analyze by using Fourier transform theory. Then, according to the electroglottogram is conjectured to be related to the area contact between the vocal folds, we assume a simple model of vocal fold vibratory motion is used to estimate the vocal fold contact area as function of time. Therefore, we modified and developed the mathematic EGG waveform model by using personal computer program computation to become a set of realistic EGG waveform models, which are …

Development Of A Rock Model Testing Capability At The New Jersey Institute Of Technology And Testing Of Plane Stress Models Possessing A Central Circular Opening With A Nearby Horizontal Discontinuity, David R. Good

Theses

This thesis had three main objectives. They were to develop a rock model testing capability at N.J.I.T. by (1) developing and building a load testing frame for rock models, including all necessary appurtenances and load measuring devices, (2) developing a rock modelling material and quantifying its properties, and (3) applying the capabilities described in items 1 and 2.

A high capacity load test frame was constructed from structural steel members. Heavy screw rams were utilized to apply load and specially constructed proving rings were employed to accurately measure load. Additionally, load platens and other support equipment were constructed.

The model …