Digital Commons Network^™

The Flexible Manufacturing System And Its Development In Taiwan, Chi-Shuan Liu

Theses

FMS is a new kind of manufacturing system which is flexible enough to handle a limited variety of parts. It usually consists of three main components: machine tools, a material handling system, and a computer control system. The material handling system is the key to integrating manufacturing cells into the FMS. The machine tools used in FMS are programmable and computer-controlled, having the ability to change their operation process rapidly to deal with product changeovers and part design changes. The digital computer used in FMS has the capability of handling various manufacturing processes which are not capable of being controlled …

Laminar Flow Through A Porous Annulus With Surface Suction, Stelios C. Nicolaides

Theses

A theoretical investigation was conducted to obtain the velocity, pressure and shear stress distributions for incompressible, steady, fully developed, laminar flow through an annulus, with a uniformly porous inside tube wall. Suction at the walls is a result of the pressure difference across the porous wall.

The continuity equation, momentum equation and the Darcy's law for suction velocity are analysed with an integral method. The resulting differential equations were solved using a numerical technique.

For the same radii ratio, dimensionless inlet pressures on both sides of the porous wall and dimensionless porous resistance, the dimensionless length required to reach zero …

Frequency Characterization Of A Thin Linear Antenna Using Diakoptic Theory, Howard Harold Smith

Theses

A frequency dependent analytical expression for the input impedance of a thin wire antenna is obtained using diakoptic theory. In diakoptic theory the linear antenna is seperated into electrically short segments where each segment is treated as a two-port network. This approach eliminates the need for an integral equation formulation. An impedance matrix is found which characterizes coupling between all segments. By expanding the free space Green's function in a power series in wavenumber k each entry in the resultant impedance matrix is obtained as a function of frequency. Enforcement of the continuity of currents and equality of scalar potentials …

Present Reliability Of Liquid Crystal Display Devices, C. N. Suresh

Theses

The purpose of this Thesis is to study the life of liquid crystal display devices as at present available in the market place. To accomplish this, accelerated tempera-ture conditions at 77°C and 85°C were used.

During the last few years, there has grown a tremendous interest in wide range temperature operating and fast LCDs. It is therefore important to understand how LCDs behave under these conditions.

The reliability of a liquid crystal display is usually measured in terms of a quantative degradation in electrical performance and a degradation in visual appearance. The degradation in visual appear6knce may manifest itself as …

Analysis Of Bolted Rock By Computer Modeling, Niann-Chyun Wang

Theses

A computer model-based on VAX-ANSYS system was developed to model the behavior of multi-layer rock systems reinforced by pretensioned rock bolts. Three models were utilized for this study. The third model represents the friction between interlayers occuring due to the tensioned rock-bolts. Results obtained from this study compare favorably with those obtained from equations developed from model studies. An attempt has been made to study the effects of creep on the behavior of the rock-layer system.

Spectrum Analysis And Real-Time Analysis Of Electroencephalograms, Suzanne Hesook Won

Theses

The analysis of the EEG background waveform is studied by two techniques, spectrum analysis and real-time analysis. The spectrum analysis is performed by using Fast Fourier Transformation (FFT) on a segment of the signal. The resulting signal is classified into different band types such as delta, theta, alpha and beta, to see the power in each band, and the magnitude of the power on the left and right side if the brain is evaluated for asymmetry. The mean power frequency shows the frequency where the maxinum power exists in each band type. This type of analysis provides overall information of …

Robot Manipulators And Control, Theresa Wu

Theses

This paper on Robot Manipulators brings together theories from three fields : computer graphics, kinematic equations and microprocessor based control.

There are four chapters in this paper, chapter one is the conceptual development on homogeneous transformations, express the position and orientation of the transposition of an object in Cartisian coordinates. Chapter two develops the method of obtaining the Cartisian coordinate position and orientation of the end effector for a manipulator, give the joint coordinate as input and use the homogeneous transformation to express the position and orientation. Chapter 3 is a very difficult one; it solves the parameters for the …

Identification Of Linear System With Feedback Input, Jyh Yang

Theses

A new procedure with feedback input is presented for identification of continuous-time systems. Using Lyapunov's direct method to prove it asymptotic stability. For the procedure to be applicable, it's assumed that all the state variables of the plant are accessible and that there is no measurement noise so the model reference scheme can be used to identify the parameters of the plant.

The procedure results in the convergence of every parameter of a model to the corresponding one of the system as the time approaching to infinite i.e. t→∞. Digital computer simulations are provided to demonstrate the feasibility of the …

Microbial Characteristics Of An Industrial Mixed Liquor After Exposure To Phenolic Compounds, Patricia L. Boyle

Theses

The microbial characteristics of a mixed population from the Passaic Valley Sewerage Commissioners (PVSC) Wastewater Treatment Plant in Newark were examined. This plant handles about 250 million gallons per day of mixed sewerage, with a large industrial component. The microbial species were characterized using standard plating techniques, morphology, microscopic observation, and biochemical tests. These characteristics were determined for the fresh liquor, and after successive batch exposure to phenol (100 ppm) and 2-chlorophenol (20 ppm). Predator/prey, gram positive to gram negative bacteria ratios, and the fungi and protozoan populations were also determined. These results were compared with those previously obtained using …

Enhancement Of The Thermophysical Capability Of The Chemical Engineering Simulation System, Joydeep Banerjee

Theses

The CHESS (Chemical Engineering Emulation System) is a generalized steady-state, sequential-modular chemical process simulation program. In this thesis, the thermophysical data prediction capability of CHESS has been expanded by: incorporating more accurate thermodynamic phase-behavior models, by utilizing these models in generating a wider range of thermophysical properties, and providing an updated and expanded database for pure-component physical properties.

The overall performance of the simulation system's thermophysical package has been evaluated using the study of a subprocess consisting of various rotational equipment modules.

In this work, the Chao-Seader liquid phase activity coefficient model has been reinstalled in conjunction with the original …

A Study Of Parameters Indicating Microbial Activity In Mixed Aerobic Cultures, William Smith

Theses

Mixed liquor suspended solids (MLSS), oxygen uptake rate (OUR) and general dehydrogenase activity, as expressed by the reduction of the electron-acceptor Dye 3-(4',5'-dimethylthiazol-2-yl)-2, 4-diphenyltetra-zolium bromide (MTT), were compared for their ability to measure microbial activity in mixed aerobic cultures. A fourth parameter, specific enzyme activity, was dropped from consideration because of the difficulty of developing a satisfactory experimental technique. Measurement of the parameters was applied to the biodegradation of phenol and o-chlorophenol by activated sludge from a municipal sewage treatment plant, and by two commercially available bacterial preparations.

MLSS, although the most commonly used of the three parameters tested, is …

Robotic Application In Taiwan, Yun-Perng Doong

Theses

During the past years, as labor costs rose, safety and environmental regulations took hold and robotic capabilities became more sophisticated; therefore, robots became valuable pieces of production equipment. Manufacturers put robots on the job to consistently produce quality products, to work in a hazardous environment, or to perform heavy duty work which humans are not able to do. Although robots have so many benefits, robot application still meets a great deal of obstacles, especially in the areas of environmental restrictions, management capabilities, and social implications.

The objective of this thesis is to identify and discuss the robotics impact on the …

The Effect Of Single Electrolytes On The Vapor-Liquid Equilibrium Of Mixed Solvents, Peggy Tomasula

Dissertations

A group-contribution model for the prediction of salt-effects on the vapor-liquid equilibria of multicomponent electrolytic solutions containing a single electrolyte is presented. Coulombic interactions are represented through a Pitzer term. Solvation effects and short-range interactions are represented through a UNIQUAC-type expression. An ion-size, a solvation and three ion-solvent interaction parameters per salt-solvent binary are required for multicomponent predictions.

All parameters are obtained only through the correlation of binary salt-solvent osmotic coefficient and vapor-pressure depression data at 25°C, in most cases, and binary solvent VLE data. The salt-solvent binary data were correlated with an average percent error in CD of 2.5 …

Ternary Ion Exchange In Fixed Beds : Equilibrium And Dynamics, David W. H. Roth

Dissertations

A model was developed to simulate ion exchange within fixed beds for ternary systems. Models of the fluid phase material balance, phase equilibria, and diffusion of ions through the film and within the resin phase incorporated the latest advances in ion exchange theory. The separate model elements were combined after testing into an overall general model. Non-linear regression support programs were developed to estimate equilibrium parameters and resin phase diffusion coefficients.

A computer program was developed to estimate axial dispersion coefficients from experimental data. General correlations derived from literature sources were tested, and axial dispersion terms were included in the …

Determinants Of Acceptance Of Computer Mediated Communication System, Computerized Conferencing & Communications Center, Starr Roxanne Hiltz, Elaine B. Kerr, Kenneth Johnson, Murray Turoff

Computerized Conferencing and Communications Center Reports

Acceptance of Computer-Mediated communication Systems (CMCS) by managers and professionals corresponds to its incorporation into their daily patterns of communication and work. Acceptance includes at least three inter-related dimensions: amount of use, subjective satisfaction with the process of using the system, and a perception that system use has positive impacts upon productivity.

Pre-use and follow-up questionnaires were distributed to 150- 250 new users of four different CMCS. Three are conferencing systems, designed to support "group work." They differ in terms of comprehensiveness or complexity of design, and size and nature of the user communities; COM/KOM, a Swedish system with mostly …

Investigation Of Pre-Detection Signal Processing Of Pseudonoise Communication Signals In The Presence Of Additive White Gaussian Noise And Cw And Bursty Interference, Israel Mayk

Dissertations

By comparison to conventional communication systems, spread-spectrum systems are known to be less affected by interference because of their large dimensionality in signal space. Nevertheless, significant performance degradation is experienced when large interference exists in a few or even one signal coordinates. In this case, interference reduction techniques are also known to provide additional processing gain. A novel class of pseudonoise (PN) invariant algorithms is derived to reduce the impact of interference and restore much of the structure of PN signals received in the presence of interference and noise. A PN signal received by a pre-detection signal process (PDSP) implementing …

Kinetic Modeling Of A Laminar-Flow Reactor, Shih-Hsin Chang

Dissertations

The laminar-flow reactor considering radial dispersion for a species incurring first-order homogeneous (bulk) and heterogeneous (wall) chemical reactions was mathematically modeled. The equation was solved both analytically, and by the Crank-Nicolson finite-difference technique.

The response surface method was used to obtain the optimum values of the two rate constants. The optimum values interact because the wall and bulk reactions proceed in parallel. Varied reactor diameters serve to decouple the bulk and wall reactions to locate the true values of the rate constants.

Four dimensionless variables were defined and used to characterize the reacting system. In addition, their values were shown …

The Effect Of A Higher Order Pole On The Optimum Design Of Minimum Threshold Phase Locked Detectors, Bernard Zivotofsky

Dissertations

The phase lockedloop is widely used as an FM demodulator known as a phaselocked detector (PLD). It is particularly useful in the detection of weak signals because lower threshold is possible with a PLD than with a conventional limiter discriminator. An enhanced version PLD known as an extended range phaselocked detector (ERPLD) is capable of further threshold reduction. The most popular PLD is a second order type I system employing a loop filter having one real pole and one real zero.

One implementation of an ERPLD calls for the addition of a differentiator to the standard loop filter which replaces …

Nucleus 1985, New Jersey Institute Of Technology

Yearbooks

This is a digitized, downloadable version of the Newark College of Engineering Nucleus.

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

Theses

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

Training New Employees In Ecuador's Esmeraldas Oil Refinery, Rodrigo Alfredo Morales

Theses

This thesis comprises an overall review of general methods of training used by two New Jersey oil refineries of similar circumstances to Ecuador's Esmeraldas oil refinery.

The method of research was a survey in the form of a questionnaire. It was sent to the five existing oil refineries across New Jersey. Statewide telephone conversations, and with Ecuadorian personnel executives were made to request pertinent information. Research from current journals, training books, and first hand data from refineries, support the recommendations and the study in general.

The results of the thesis include recommendations as to the most advantageous policies and training …

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

Theses

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

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

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

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

The bibliography …

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

Theses

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

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

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

Application Of The Self-Assessment Technique To Improve The Productivity Of The Project Engineering Function : A Case Study, Roman Stetkiewych

Theses

While traditional industrial engineering methods can be successfully applied to improve productivity in the operations area, their effectiveness is limited where knowledge type work is being performed. For these types of activities, self-assessment has been proposed as a methodology to achieve increased efficiency. This thesis presents the results of applying this concept to the engineering function of a manufacturing firm.

Using a directed set of questionnaires as a focus, a self-assessment of itself was conducted by the Project Engineering Department to consider how well it thought itself to be performing and what its deficiencies were. Co-jointly the departments whose work …

The Biodegradation Of Phenolics Using Mixed Liquor From Passaic Valley Sewerage Commissioners Plant, Newark, New Jersey, Daewon Pak

Theses

The biological degradation of phenol, O-chlorophenol, and 2,6-dichlorophenol was studied at room temperature in aerated 5 liter batch reactors using mixed liquor from Passaic Valley Sewerage Commissioners Plant (Newark, New Jersey). From the concentration versus time data, kinetic rate constants were determined for phenol (at 100 ppm), 2'-chlorophenol (at 20 ppm), and 2,6-dichlorophenol (at 10 ppm). Air stripping and adsorption were determined to be insignificant removal mechanisms for the three compounds studied.

It was noted that the biodegradation rates increased after the organisms were acclimated to 100 ppm phenol. In addition, on substrate exposure, the degradation rate increased from the …

Digital Fm-Demodulation Using Digital Signal Processing Techniques, Peter Wagner

Theses

This thesis presents the results of research in the area of digital demodulation of FM signals. The first part of the thesis describes the performance of digital Hilbert-transformers and Differentiators that are optimized in a determined bandwidth. These digital filters are used to build a digital Klapper-Kratt detector. According to this procedure, the coefficients of the digital Klapper-Kratt detectors up to the filter length N=25 are calculated and the resulting discriminator ripple computed and evaluated. One suggested algorithm gives the opportunity to balance the detector at a certain center-frequency. The major part of this thesis describes a new approach towards …

Human Factors In The Design Of Computer Graphics Input/Output Interfaces, Michael Uche Amadi

Theses

Computers are used for solving problems of various kinds and therefore, if the users are to fully benefit from the systems, they must be considered during the earliest stages of the system development. There are three major classes of computer users namely: naive, managerial, and scientific-technical. These users have different characteristics that the designer must consider within his/her system. Only by including such distinctions will these user groups each be able to perform at their respective optimum levels. Just as there are different users, there are also numerous applications to which computers can be applied. This thesis will be restricted …

Two Dimensional Diffusional Model For Leakage Of Macromolecules In The Interstitial Space, Suthiluk Dumrongsiri

Theses

Two dimensional diffusion of macromolecules through the interstitial in the hamster cheek pouch was studied with intravital fluorescence microscopy. After topical application of Bradykinin, the movement of Fluorescein isothiocyanate (FITC)-labeled dextrans of average molecular weight 150,000 daltons (Dextran 150) was recorded on videotape which latter was played back frame-by-frame for analysis by digital image processing. Leakage of macromolecules in response to topical application of Bradykinin occurs at discrete leakage site in post caplillary venules of 15-25 um diameter, rather than in the capillary themselves. A mathematical model of two dimensional convection plus diffusion was used to simulate the macromolecule transport. …

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

Theses

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

Vapor Pressures Of Some Coal Oil Fractions, David G. Gaydos

Theses

New data on coal tar oils and data from the literature on pure compounds and oils derived from coal were used for testing the predictions by the correlation of Maxwell—Bonnell. Based on the observation that the discrepancies between the predicted values and the data are systematic, recommendations were deduced on needed modifications to the correlation. A proposal for modification to the Maxwell and Bonnell correlation to improve prediction of vapor pressures of highly aromatic fuel fractions with characterization factors of8 UOPK 10.5 was made.

Experimental data were taken on vapor pressures of fractions of coke oven coal tar oils and …