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1993

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Articles 1 - 30 of 1435

Full-Text Articles in Engineering

Aqueous Absorption Of Nitrogen Oxides Induced By Oxychlorine Compounds : A Process Development Study For Flue Gas Treatment, Chen-Lu Yang Dec 1993

Aqueous Absorption Of Nitrogen Oxides Induced By Oxychlorine Compounds : A Process Development Study For Flue Gas Treatment, Chen-Lu Yang

Dissertations

The use of chlorine (Cl2), sodium hypochlorite (NaClO), and sodium chlorite (NaClO2) as oxidizing agents to promote the absorption of nitric oxide (NO) from gas streams has been investigated in the Gas Scrubbing Laboratory of New Jersey Institute of Technology since 1988. The first step of this project had been to screen out the best scrubbing medium for nitric oxide removal from flue gases. The most successful oxidizing agent was found to be sodium chlorite in acidic aqueous solution. The screening results have been accepted for publication in Chemical Engineering Communications. A sodium chlorite containing aqueous acid solution ...


Numerical Investigation Of Flow Through Wide Angle Diffusers, Moududur Rahman Dec 1993

Numerical Investigation Of Flow Through Wide Angle Diffusers, Moududur Rahman

Dissertations

This study is aimed at the development of a computational technique for the prediction of the flow field in wide angle diffusers. The finite element technique is used for the solution of the governing equations. A commercial software package, NISA/3DFlUID, modified for this specific application was used. The parameters affecting the flow field have been identified. For a wide range of variation of these parameters, the effects on the flow field have been examined. This investigation is an exhaustive and comprehensive numerical study of diffuser flows. Such a study will result in substantial improvement in the understanding of the ...


An Investigation Of The Formation Of Turbulent Water And Abrasive Water Jets, Md. Ekramul Hasan Khan Dec 1993

An Investigation Of The Formation Of Turbulent Water And Abrasive Water Jets, Md. Ekramul Hasan Khan

Dissertations

This study is concerned with the development of a knowledge base for the selection of nozzle geometry by investigating the mechanism of formation and behaviors of water and abrasive water jets. A numerical prediction of turbulent water flow inside various nozzles is developed. The analysis is based on the numerical solution of conservation equations of continuity and momentum as well as equations of turbulent kinetic energy and dissipation for 2-dimensional axisymmetric flow by using a finite element package, FIDAP.

The technique for determining velocities and forces of water jet and abrasive water jet with the Laser Transit Anemometer and Piezoelectric ...


Computer Aided Stress Analysis Of The Femur With Prosthetic Hip Stem Utilizing Computed Tomography, Wei-Chun Chang Dec 1993

Computer Aided Stress Analysis Of The Femur With Prosthetic Hip Stem Utilizing Computed Tomography, Wei-Chun Chang

Dissertations

A computer aided design and analysis method, utilizing computed tomography (CT) is developed, which together with a finite element program determines the stress and deformation patterns in the femur with hip prosthesis. The CT scan data file provides the geometry and the material parameters for the generated finite element model. The three-dimensional finite element model of the femur with hip prosthesis is automatically generated from the CT data file by a preprocessing procedure. The preprocessor includes a CT image display, edge detector, nodes generation, prosthesis simulator, mesh generator and model display. The loading conditions applied on the finite element model ...


Human Visual System Modelling : Analysis Of Evoked Potential Dynamics, Zongqi Hu Dec 1993

Human Visual System Modelling : Analysis Of Evoked Potential Dynamics, Zongqi Hu

Dissertations

The visual evoked potential (VEP) reflects the electrical activity in the cerebral cortex due to visual stimulation. It contains information on signal processing in the visual pathways from the retina, through the lateral geniculate nucleus (LGN) to the cortical level. Although the VEP is generated by various sources in the multi-layer neural network, the functions of some neuronal mechanisms and the transfer characteristics of particular pathways can be revealed and analyzed by use of carefully designed stimuli (Zemon & Ratliff, 1984; Zemon, Victor & Ratliff, 1986). This dissertation focuses on studies of the visual evoked potential as a composite of neuronal activities such as direct-through excitation, local lateral inhibition and contrast gain control.

The work concentrates on the sandwich model, a three stage combination of linear-nonlinear-linear elements, introduced in 1970 by Spekreijse & Oosting, to represent signal flow in the visual pathways. Previous efforts to identify the three elements involved stimulation with contrast reversing spatial patterns using a two-sinusoid temporal signal (Spekreijse & Reits, 1982; Zemon & Ratliff, 1984; Zemon, Victor & Ratliff, 1986). Results of these studies are limited to amplitude and phase characteristics of the two linear elements in terms of sum and difference frequency components of the VEP.

In the current work, transfer functions were sought for the two linear elements in the original three-stage sandwich system in order to obtain an analytic description of the system. The goal was to represent the frequency responses, including those for sum and difference frequencies obtained from two-sinusoid stimulation, as well as transient responses elicited by step (square-wave) contrast reversals. Data from ten normal subjects were analyzed. To fit the observed data collected from those subjects, it was found that the first linear element in the sandwich system must be a non-minimum phase function with zeros in the right half s-plane.

Based on prior investigations of single-cell responses in the cat retina (Shapley & Victor, 1978; 1981; Victor, 1981) and the VEPs in humans studied with a two-sinusoid contrast reversing pattern (Zemon, Victor ...


Design And Implementation Of Fuzzy Logic Controller For A Process Control Application, Sujit S. Nerurkar Dec 1993

Design And Implementation Of Fuzzy Logic Controller For A Process Control Application, Sujit S. Nerurkar

Theses

Many industrial applications of fuzzy logic control have been reported. This thesis studies and reports the problems associated with the Heat-exchanger temperature control via conventional PID control implemented with Programmable Logic Controllers (PLC) and provides an example of design and implementation of fuzzy logic controllers (FLC's) for a Heat exchanger in a Water for Injection (WFI) system.

After a basic FLC was designed and tested, it is shown how its rule base evolved to achieve superior performance by utilizing additional low-cost sensing information in the process and its environment. A method for the implementation of FLC's into the ...


Application Of The Wavelet Transform To Biomedical Signals, Karl O. Hauck Dec 1993

Application Of The Wavelet Transform To Biomedical Signals, Karl O. Hauck

Theses

The basic concepts and fundamentals of the wavelet signal representation were examined. The orthonormal wavelet was selected for this project after being compared to various types of wavelets. The orthonormal wavelet was chosen due to the equal time and frequency resolution exhibited in the wavelet coefficients. Programs were written in Matlab to implement the orthonormal wavelet in developing wavelet coefficients for a given signal. The programs include the conditions for an orthonormal wavelet in and which produce the wavelet filters g(n) and h(n). The wavelet filters were then incorporated into another program that applied Mallat's multiresolution algorithm ...


An On-Line Approach For Evaluating Trigonometric Functions, Rajesh Amin Dec 1993

An On-Line Approach For Evaluating Trigonometric Functions, Rajesh Amin

Theses

This thesis investigates the evaluation of trigonometric functions based on an on-line arithmetic approach. On-line algorithms have been developed to evaluate the sine and cosine functions. Error analysis and heuristics are carried out to arrive at a minimal error algorithm based on the series expansion of the sine and cosine function.

A logical design based on the algorithm is presented where the unit is designed as a set of basic modules. A detailed bit slice design of each module is also presented. A simulator was designed as an experimental tool for synthesis of the on-line algorithms, and a tool for ...


Fast Point Pattern Matching By Heuristic And Stochastic Optimization Techniques, Ashish Agrawal Dec 1993

Fast Point Pattern Matching By Heuristic And Stochastic Optimization Techniques, Ashish Agrawal

Theses

This work is concerned with one of the methodologies used in the final stages of machine vision: the matching of model point patterns to observed point patterns. Conventional search methods not only fail to arrive at the optimal match, but are also computationally expensive and time consuming. To arrive at the optimal pattern match, stochastic and heuristic optimization as the search technique, exploiting Simulated Annealing (SA), Evolutionary Programming (EP) and Mean Field Annealing (MFA), are explored in detail. A comparison of results obtained using SA versus "hill-climbing" and "exhaustive search" techniques, and results of EP are presented. The relative effectiveness ...


An Adaptive Fusion Model For Distributed Detection Systems With Unequiprobable Sources, Yuzheng Zhang Dec 1993

An Adaptive Fusion Model For Distributed Detection Systems With Unequiprobable Sources, Yuzheng Zhang

Theses

In a traditional communication system, a single sensor such as a radar or a sonar is used to detect targets. Since the reliability of a single sensor is limited, distributed detection systems in which several sensors are employed simultaneously have received increasing attention in recent years. We consider a distributed detection system which consists of a number of independent local detectors and a fusion center. Chair and Varshney have derived an optimal decision rule for fusing decisions based on. the Baysian criterion. To implement such a rule, the probability of detection PD and the probability of false alarm ...


Design Of An Autonomous Vehicle System, Fritz Gerald Momplaisir Dec 1993

Design Of An Autonomous Vehicle System, Fritz Gerald Momplaisir

Theses

With advances in electronics, mobile vehicles are becoming more and more sophisticated. The Potential applications of AGVs are numerous an range from a material handling system for the factory floor to an intelligent wheel chair for the handicapped. The design of these vehicles, however, remains a difficult task. Even when the machine is given precise information about its environment, the fact that it is never free of noise further complicate the situation. One of the goals of an AGV project is to design a robust system that will operate efficiently in the presence of different sources of noise.

The scientific ...


Sulfuric Acid Resistance Of Fly Ash Mortar, Walairat Bumrongjaroen Dec 1993

Sulfuric Acid Resistance Of Fly Ash Mortar, Walairat Bumrongjaroen

Theses

Crown corrosion of concrete pipe and its subsequent repair is a topic much discussed in recent years. Present protective methods have not worked effectively. Due to its properties and its low cost, fly ash was used as a cement replacement of mortar to investigate its sulfuric acid resistance.

Different types and different percentages of fly ashes were mixed with and without admixtures including microsilica, and superplasticizer. The main parameters investigated included the chemical compounds, the fineness and the volume of fly ash. 2"x2" cubes were immersed in a 10% sulfuric acid pond. The weight of each cube was determined ...


Time Frequency Analysis Of The Electromyogram During Fatigue, Michelle Rene Davies Dec 1993

Time Frequency Analysis Of The Electromyogram During Fatigue, Michelle Rene Davies

Theses

Spectral parameters obtained from the surface EMG signal have been used as indicators of fatigue during a sustained contraction. These same parameters have not been tested with the EMG signals obtained from fine wire electrodes. One such parameter is the median frequency which is known to decline with fatigue. A comparison was done between the median frequencies obtained from the surface EMG and those obtained from the fine wire EMG. The median frequencies from both types of electrodes decreased with time indicating that fine wire electrodes could be used to measure fatigue.

In addition, a new technique, time frequency analysis ...


Fluid Flow Modeling For Pneumatically Fractured Formations, Deepak Nautiyal Dec 1993

Fluid Flow Modeling For Pneumatically Fractured Formations, Deepak Nautiyal

Theses

This thesis investigates the flow of compressible fluids in pneumatically fractured formations. Pneumatic fracturing is a recently developed technique for increasing permeability in geologic formations by the controlled injection of high pressure air. The artificially induced fractures enhance the flow rate of liquids and vapors in the subsurface, and can be applied to in situ remediation of hazardous waste sites, and for other hydrogeological applications.

A flow model for discrete fractures is derived based on the assumptions of viscous, laminar fluid flow through planar fractures (Poiseuille type flow). The model takes into account non-linearity introduced by gas compressibility effects. Provision ...


An Integrated Mrp And Finite Scheduling System To Derive Detailed Daily Schedules For A Manufacturing Shop, Sita D. Nathan Dec 1993

An Integrated Mrp And Finite Scheduling System To Derive Detailed Daily Schedules For A Manufacturing Shop, Sita D. Nathan

Theses

Many companies rely on Material Requirements Planning (MRP) to support their Production Scheduling and Control (PS&C) functions. Since MRP does not provide a detailed shop floor schedule, these users have to implement either a third party procedure or an internally developed procedure for shop floor controls. In this thesis we consider a class of user shops which are characterized by the following features:

  • Homogenous machines, that is all machines can produce all products.

  • Each product requires a setup, but several products may have a common setup.

  • MRP requirements are specified on a weekly basis while actual requirements are specified ...


Transient Behavior Of An Adaptive Synchronous Cdma Receiver, Bin Zhu Dec 1993

Transient Behavior Of An Adaptive Synchronous Cdma Receiver, Bin Zhu

Theses

A steepest descent algorithm is used to update the adaptive weights of a two-stage synchronous Code-Division Multiple-Access (CDMA) receiver that was proposed recently. An issue of the adaptive CDMA system - the convergence and stability property of the receiver is investigated in this thesis.

This adaptive synchronous CDMA receiver uses a decorrelator at the first stage and adopts a neural network which acts as an interference canceler at the second stage. It can achieve near-optimum performance. Furthermore, its computational complexity is just a square function of the number of users. The only requirement is the knowledge of the users' signature sequences ...


Fabrication Of Micron-Sized Mirror/Cantilever Silicon Devices For Crosspoint Switching Arrays, Yasser A. Abdel-Aziez Dec 1993

Fabrication Of Micron-Sized Mirror/Cantilever Silicon Devices For Crosspoint Switching Arrays, Yasser A. Abdel-Aziez

Theses

This thesis describes the fabrication of micron-sized vertical mirrors at the end of horizontal cantilevers, that are electrostatically controlled. The mirrors, 40x 40 μm with thicknesses of 1.5-6 μm, were made by using the etch resistance to 40% KOH etchant of <111> planes and oxide stripes. The cantilever beams, 100 to 350 μm long and 0.44 to 0.81 μm thick, were fabricated using the etch resistance of heavily doped boron layers to 10% KOH at 50 °C. Two technologies to introduce the boron layers were investigated. The ion implantation approach was based on thick oxide/photoresist masking. A ...


Comparison Of Air Traffic Control Candidate Ability With Simulator-Based Training Measures, Lawrence A. Tomaskovic Dec 1993

Comparison Of Air Traffic Control Candidate Ability With Simulator-Based Training Measures, Lawrence A. Tomaskovic

Theses - Daytona Beach

The purpose of this study was to determine if the utilization of an experimental computer-based selection test battery would aid in the prediction of a candidates performance when using an air traffic control computer-based simulation program. Each candidate completed the selection test battery, and then received air traffic control instruction using the air traffic control simulation program incorporated in the TRACON/Pro™ simulator system. The selection test battery results were correlated with the subsequent simulator scoring results.


The Effect Of Active And Passive Control On Air Traffic Controller Dynamic Memory, Esa M. Rantanen Dec 1993

The Effect Of Active And Passive Control On Air Traffic Controller Dynamic Memory, Esa M. Rantanen

Theses - Daytona Beach

The purpose of this study was to investigate the effect of automated and passive control on air traffic controller dynamic memory. The study consisted of two experiments, each involving a realistic ATC scenario for radar approach control with a mix of arriving and departing traffic. In Experiment I, the subjects performed manual control of the traffic while, in Experiment II, the scenario was highly automated and the subjects were tasked with only monitoring the situation. The dynamic memory performance was measured by interrupting the scenario and having the subjects recall the traffic situation at the moment of simulation interruption. The ...


On Stationary And Moving Interface Cracks With Frictionless Contact In Anisotropic Bimaterials, Xiaomin Deng Dec 1993

On Stationary And Moving Interface Cracks With Frictionless Contact In Anisotropic Bimaterials, Xiaomin Deng

Faculty Publications

The asymptotic structure of near-tip fields around stationary and steadily growing interface cracks, with frictionless crack surface contact, and in anisotropic bimaterials, is analysed with the method of analytic continuation, and a complete representation of the asymptotic fields is obtained in terms of arbitrary entire functions. It is shown that when the symmetry, if any, and orientation of the anisotropic bimaterial is such that the in-plane and out-of-plane deformations can be separated from each other, the in-plane crack-tip fields will have a non-oscillatory, inverse-squared-root type stress singularity, with angular variations clearly resembling those for a classical mode II problem when ...


Modeling Technique For Optimal Recovery Of Immiscible Light Hydrocarbons As Free Product From Contaminated Aquifer, Grant S. Cooper Jr., R. C. Peralta, J. J. Kaluarachchi Dec 1993

Modeling Technique For Optimal Recovery Of Immiscible Light Hydrocarbons As Free Product From Contaminated Aquifer, Grant S. Cooper Jr., R. C. Peralta, J. J. Kaluarachchi

Civil and Environmental Engineering Faculty Publications

Contamination sites associated with light non-aqueous phase liquids {LNAPL) are numerous and represent difficult cleanup problems. Remediation methods for cleanup of LNAPL fluids in subsurface systems are continuously evolving with the development of various technologies for pump.-and~treat, soil venting, and in-situ bioremediation. Evaluating the effectiveness of remediation techniques as well as attempting to improve their efficiency has been a focus of many researchers, These efforts have included the development of computer simulation models to predict and analyze the fluid movement, entrapment, and mobilization of three~phase systems in porous media. The capability of computer models that not only ...


Domino Online Terpercaya, Agen Domino Online Dec 1993

Domino Online Terpercaya, Agen Domino Online

agen domino online

Berikut ini adalah sebuah abstact dari domino online terpercaya yang sudah banyak kita temui di berbagai macam jejaringan internet maupun di sosial media juga.
Domino online merupakan permainan 2 kartu maupun 4 kartu tergantung dari permainan yang dimainkan seperti domino qiu qiu ( di mana bermain dengan 4 kartu ) dan adu q ( di mana bermain hanya dengan 2 kartu )
Dan permainan domino sudah banyak beredar di app store bahkan permainan domino sudah beredar di situs-situs yang berhubungan JUDI dan dalam permainan tersebut memakai uang asli dengan cara transaksi melalui online
Bagi seorang pro judi tidak akan sulit dalam memperlajari permainan agen ...


"The Right Stuff", Farming By Location, Tom Colvin, Jack Ambuel, Kandiah Jeyapalan Dec 1993

"The Right Stuff", Farming By Location, Tom Colvin, Jack Ambuel, Kandiah Jeyapalan

Proceedings of the Integrated Crop Management Conference

A satellite-based positioning system is being developed to determine the location of farm equipment while working in the field. A satellite receiver mounted in a moving tractor or combine calculates position coordinates based on signals received from a selection of satellites in the Department of Defense Global Positioning System (GPS). The position coordinates are retrieved from the receiver by a computer and combined in a common data base with additional information collected by the computer such as yield, soil fertility, soil moisture, temperature, implement draft, and fuel consumption. There are a number of possible applications for this system. One is ...


Post-Harvest Management Strategies For '93 Corn, William F. Wilcke Dec 1993

Post-Harvest Management Strategies For '93 Corn, William F. Wilcke

Proceedings of the Integrated Crop Management Conference

Cool, wet growing seasons like 1993 can result in late harvest of wet, immature, low-quality corn. Quality problems include:


Selecting Fans And Determining Airflow For Grain Drying And Storage, William F. Wilcke, R. Vance Morey Dec 1993

Selecting Fans And Determining Airflow For Grain Drying And Storage, William F. Wilcke, R. Vance Morey

Proceedings of the Integrated Crop Management Conference

Using fans to force air having the proper temperature and relative humidity through a crop is a valuable technique for maintaining quality after harvest. The air helps maintain the moisture and temperature of a crop at levels that prevent growth of harmful fungi and insects.


Soil Compaction Problems Of 1993, Stewart W. Melvin Dec 1993

Soil Compaction Problems Of 1993, Stewart W. Melvin

Proceedings of the Integrated Crop Management Conference

The 1993 crop season will be one that few Iowa farmers will forget. Excess precipitation was common from the last half of 1992 and throughout the entire 1993 cropping season. There has been an increased concern over soil compaction problems throughout this season, and what these problems may create for the 1994 crop year. The objective of this paper will be to review how and why the problem has occurred and what should be done, if anything, to minimize the problem in 1994.


I'Ve Got It ... Or Maybe I Don't Dec 1993

I'Ve Got It ... Or Maybe I Don't

Syracuse University Magazine

No abstract provided.


Nitric Oxide Production: A Mechanism For Inhibition Of Chlamydia Trachomatis Replication, Bojun Chen Dec 1993

Nitric Oxide Production: A Mechanism For Inhibition Of Chlamydia Trachomatis Replication, Bojun Chen

Electronic Theses and Dissertations

Chlamydia trachomatis (CT) replicates in macrophages, but is inhibited by IFN-$\gamma$ or LPS. IFN-$\gamma$ and/or LPS induced nitrite production in mouse peritoneal macrophages, macrophage cell lines (RAW264.7 and J774A.1) and McCoy cells. Kinetic studies indicated that peak production occurred 48 hours post-treatment. CT infection itself was insufficient to induce nitrite production, but resulted in enhancement of nitrite production in IFN-$\gamma$-treated cells. Treatment with IFN-$\gamma$ or LPS resulted in significant inhibition of CT replication in these cells. Strong correlation between nitrite production and inhibition of CT replication was observed in RAW264.7 and ...


Effect Of A Range Ring And Of Intruder Vertical Rate On Pilot Perception Of Separation On A Cockpit Display Of Traffic Information, Paul V. Wassell Dec 1993

Effect Of A Range Ring And Of Intruder Vertical Rate On Pilot Perception Of Separation On A Cockpit Display Of Traffic Information, Paul V. Wassell

Theses - Daytona Beach

This study was conducted to determine the effect of a range ring and intruder vertical rate on pilots’ perception of aircraft separation as viewed on a cockpit display of traffic information. A group of 30 pilots from Embry-Riddle Aeronautical University participated as subjects. SuperCard® Version 1.6 software and a Macintosh IIsi® personal computer were employed to generate the simulation of a cockpit display of traffic information. Each pilot monitored 80 unique scenarios in which they determined, as early as possible, what the vertical miss distance would be when a single intruder passed ownship. The pilots’ decision time and perceived ...


A Feasibility Study Of A Private Entity Competing With Fbos For Airline Ground Handling Contracts, Carlos A. Vergas Dec 1993

A Feasibility Study Of A Private Entity Competing With Fbos For Airline Ground Handling Contracts, Carlos A. Vergas

Theses - Daytona Beach

This thesis investigates whether a private entity can compete with fixed base operators (FBOs) for airline ground handling contracts. Separating the research method into five phases, the author first conducts a need analysis. Then, the author dissects the structure of existing ground handling contracts. Thirdly, the average service charges presently in place are tabulated. Fourthly, a financial analysis is performed including the calculation of the break-even point at a profit. Finally, a model of ground handling operation is simulated using an existing air carrier’s ground handling contract.