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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 …

Applications And Evaluation Criteria For Robotic Systems, Brijan Shirish Badshah

Theses

The robot industry is one of the fastest growing industries. In almost every area of manufacturing, robots are being considered for one or more tasks, but the success of any commercial industrial undertaking has to be measured in terms of financial performance.

To help practitioners in the manufacturing area, an economic analysis and investment appraisal technique for robotic systems is developed, especially to assist managers in making the crucial decision about utilizing an industrial robot. An interactive microcomputer program is developed which performs the economic analysis for cost justification and helps managers to decide whether the implementation of a robot …

Comparison Of Several Manufacturing Techniques Used To Produce A Sterile Antibiotic Powder, Antonio Joseph Barberio

Theses

There are several manufacturing processes (crystallization, spray drying, freeze drying, and closed crystallization) that are used to produce a sterile antibiotic powder. A pharmaceutical manufacturer is faced with the problem of deciding which process is best suited for their operations. The purpose of this thesis is to propose a comparison technique that might aid in a solution to this problem. In the first step of the comparison technique, a fixed rating is assigned to a number of different categories (i.e. initial cost of equipment, product purity, etc.) for each process. The fixed ratings were established from an industrial survey, and …

The Effects Of Different Administrative Parameters On Learning In A Management Simulation, Stephen Christopher Betts

Theses

This research puts forth a set of conclusions regarding the relationship between how a full scale interactive and competative management simulation is organized and executed and how effective the experience seems to participants. One hundred sixty students who participated in management simulations in five different schools were questionaired about how effective the simulation was in teaching ten different subject areas. Their instructors and other game administators were interviewed to Find out how and why the simulation was organized and executed the way that it was in their school. The simulation used in all five samples was the Tempomatic IV. The …

Modelling Of Pile Load Tests In Weak Rock, Daniel Walter Caruso

Theses

The purpose of this thesis was to investigate the loss of load capacity of relaxed pile groups driven into weak bedrock. This was accomplished in the laboratory using a dynamic driving apparatus equipped with a static load testing system. The static load testing system applied loads hydraulically, and the load settlement behavior was monitored using an electronic load cell and a linear variable differential transducer (LVDT).

Tests were performed using 1" diameter steel pipe piles driven in a five pile group pattern at spacings of two diameters and four diameters. Piles were driven into a simulated rock mass consisting of …

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 …

Utilization Of The Microcomputer To Improve The Productivity Of Small Manufacturing Companies, Hung-Gi Chang

Theses

The ongoing microcomputer development has led to its increasing application in manufacturing to reduce costs and improve productivity. Being more aware of this technology, most of these benefits have accrued to large firms. The intent of this thesis is to show that it is equally advantageous for small manufacturing companies to utilize them and show how they can do so.

The paper discusses the role and characteristics of microcomputers. Available software to do engineering designs, materials requirements planning, process planning, and master production scheduling is described. Using a case study a method that can be followed in selection and implementation …

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 …

Pozzolanic Admixtures In Concrete Mix, Ronghao Chen

Theses

Fly ash and condensed silica fume are two main mineral pozzolanic admixtures in portland cement concrete. The increasing use of the fly ash in concrete projects and concrete products during the past 3O years and condensed silica fume in several projects during the past 1O years indicates a greater acceptance of them as the mineral pozzolanic admixtures in concrete. Although the engineers are of some identical views in using these industrial byproducts in concrete projects, there are different views on how the behavior and utilization of fly ash con-crete and condensed silica fume concrete since the byproducts are not the …

Pressure Drop In A Strainer Element By The Finite Element Method, Wei-Long Chen

Theses

The pressure drop in a strainer element which consists of a channel and a diffuser has been investigated by the finite element method and the semi-empirical analysis.

An existing finite element program, FEM2D using the penalty parameter model, was employed. It was found that the range of Reynolds numbers in the strainer element was 0.193 to 4.824. For the pressure drop in the channel, the finite element method is in agreement with the analytical solution. For flow in the diffuser, the finite element method failed to give satisfactory results due to flow separation.

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.

Characterization Of Microorganisims After Feeding With Phenolic Compounds : Comparing A Domestic Sludge To An Industrial Sludge, Dianne Adamowitz

Theses

This study examined the effects of phenolic compounds on the populations in mixed liquors obtained from two very different treatment plants: the Passaic Valley Sewerage Commissioners plant in Newark, and the Livingston, NJ municipal treatment plant. The dominant organisms were identified initially and after ten days exposure to phenol (100 ppm), and either 2-chlorophenol (20 ppm) or 2,6-dichlorophenol (10 ppm) in aerated batch reactors.

Results confirmed the remarkable similarity between the two mixed liquor populations, in spite of the significant differences in the operation of the two treatment plants.

Osmotic And Mean Activity Coefficients Of Cacl2, Nai, Libr And Licl In Ethanol At 50 Degrees C, Gregory J. Czerwienski

Theses

Vapor pressure depression data for CaCl₂, NaI, LiBr, and LiCl were measured at a molality ranging between 0.2-7.5 depending on the solubility of the salt in ethanol. Data were also measured at 35° C for the LiCl. The apparatus used was a recirculation still of the Othmer type.

Osmotic coefficients were calculated from the total pressure of the system. The one parameter Bromley equation and the three parameter Pitzer equation were used to correlate the data. For all the systems, the Pitzer equation correlated the data better as one would expect. Mean activity coefficients were calculated graphically and …

Biodegradation Of Mixed Phenolic Substrates, Prasad Gonnabathula

Theses

The biological degradation of phenol, with either 2-chlorophenol, 2,6-dichlorophenol, or nitrobenzene as cosubstrates was studied in aerated five - liter batch reactors using mixed liquor from the Passaic Valley Sewarage Commissioners wastewater treatment plant (Newark, NJ). The initial substrate concentrations were: 100 – 150 ppm phenol, 10 - 20 ppm 2-cp, 10 ppm 2,3 dcp, and 10 - 20 ppm nitrobenzene. The concentration vs. time data were fit to three kinetic models: zero-order, first-order, and Monod(assuming constant biomass). Most of the data were best fit by either the Monod or zero-order model. For all compounds tested, biodegradation was the primary …

Physical And Mechanical Properties Of A New Type Of Polymer Concrete, Kyan Bin Khoo

Theses

A new type of Polymer concrete is an admixture of a special Latex, Portland cement and Sand. It has high bond strength, quick curing, durability and adequate strength. The Mechanical and Physical properties were investigated in this paper. Reinforcement with Glassfiber was done and its properties compared to those of control specimens. The heat generation in Polymer Concrete (PC) and its relationship with the properties of PC was also investigated.

A new type of Polymer concrete is an admixture of a special Latex, Portland cement and Sand. It has high bond strength, quick curing, durability and adequate strength. The Mechanical …

The Separation Of Proteins Via Charged Electromembrane Process, Chi-Wen Lin

Theses

A new method for separation and concentration of protein and other biocolloids such as hemoglobin and albumin was developed by a process called the charged electromembrane (CEM) process. The process is characterized by using a metallic membrane as a filter which can carry either positive or negative electric current.

The effect of various factors on the separation coefficient and filtration efficiency were investigated experimentally. These factors include strength of electric field, pH of colloidal solution, electric current through membrane filter and flow rate.

It was found out that the thickness of the gel layer formed on the membrane could be …

The Kinetics And Mechanism Studies Of A Polymer Powder Coating On Metal Surface By Cathodic Electrodeposition Process, Wen-Lin Wu

Theses

A polymer dispersion of fluorocarbon with solid constent in the range of 10-25% were prepared from white powder polytetrafluorethylene (PTFE), emulsifier combination of dodecylbenzyldimetlyl sulfonium chloride and Trition N-150, and other components or additives. Such a fluorocarbon dispersion is very stable against coagulation and has a pH in the range of 8-10, which is especially suitable for powder coating purpose.

A new electrocoating technique, which is called cathodic electrodeposition powder coating method, was conducted in this study. This new coating method includes four steps: pretreatment, electrocoating, drying and baking. Two kinds of degreased metal substrates, aluminum and steel plates, were …

Prediction Of Vapor And Liquid Equilibrium Properties For 25 Organic Priority Pollutants In Aqueous Solution, Pinchieh Pai

Theses

Activity coefficients and Henry's law constants for 25 organic priority pollutants were estimated using UNIFAC thermodynamic calculations. For 6 of these compounds, the results were compared with measured values reported in the literature. This indicated errors in the UNIFAC predictions varying from 24.0% to 95.0%. Best results with UNIFAC were obtained using liquid-liquid equilibria, rather than vapor-liquid equilibria.

Octanol/water partition coefficients were also estimated for the same 25 organic priority pollutants using the fragment constant method. Results differed from values reported in the literature by 5% to 170%.

Estimated activity coefficients were also used to predict stripping rates of organic …

Biodegradation Of Phenol And 2-Chlorophenol Using A Fill-And-Draw-Reactor, Chi-Chun Tsai

Theses

The biological degradation of phenol and 2-chlorophenol was studied at room temperature in a microprocesser controlled fill-and-draw reactor using activated sludge from the Passaic Valley Sewerage Commissioners wastewater treatment plant (Newark, New Jersey). The reactor was cycled through four unit processes: fill, react, settle, and draw. Different cycle times were tested, and the system response was characterized by dissolved oxygen measurements and substrate analysis (by gas chromatography).

With inhibitory substrates, such as those tested, this reactor had much more flexibility, and was therefore much easier to operate, than a standard continuous flow reactor.

The Conversion Of The Process Flowsheet Simulator, Flowtran, For Fortran 66 Based Mainframe Computers, Timothy Edward Roche

Theses

The process flowsheet simulator FLOWTRAN was converted from FORTRAN 77 code to FORTRAN 66 code. The conversion was accomplished by developing a number of subprograms to handle FORTRAN 77 intrinsic functions that are missing in the FORTRAN 66 standard and by altering the code to take advantage of the developed subprograms. Also developed were a set of procedure files for executing the FORTRAN 66 FLOWTRAN on a Sperry-Univac 90/80-4. The new FLOWTRAN was tested and performs identically to the FORTRAN 77 version. The FORTRAN 66 FLOWTRAN can be installed on any mainframe computer with a FORTRAN 66 compiler.

The Effect Of Toxic Substances On The Index Properties Of Soils, Ronald Dicola

Theses

Contaminated soils were tested to determine if a relationship existed between their index properties and hydraulic conductivity. Atterberg Limit tests and Particle Size Analysis tests were performed on Woodbury, Raritan and Brunswick formation soils. The chemicals examined were Benzene, Phenol and Trichloroethylene (TCE). Tests were performed following the ASTM Standard Test Methods with only slight modification to accommodate the use of contaminated soils. Two different methods of soil contamination were used, one for chemical solutions and the other for pure chemicals.

Particle Size Analysis tests were performed both with and without dispersing agent. Hydrometer tests with dispersing agent resulted in …

Cybernetic Theory Applied In Production Control, Ding-Hsin Fang

Theses

There are many theories for the control of production. Also. there are many successful cases for each of the different theories.

Cybernetic theory is quickly evolving as a design basis for management control systems. Cybernetics is the science of self-regulation and its basic tenents are control, or the ability to direct action toward a predetermined goal, and communication, or the ability to send and receive information.

The objective of this thesis is to identify and discuss this theory applied to the management techniques of production control for a Far Eastern textile firm and to investigate the extent that the firm …

A Computer Aided Manufacturing System For Small Quantity Prototype Board Production, Santiago Garcia-Perez

Theses

A matrix addressed manufacturing tool has been built, tested, and integrated in a system aimed to exploit wire-wrap wiring technology for protoboard production in small quantities. Extensive software exploits the power and economy of the personal computer as a superb manufacturing tool and documentation system. Computer graphics are used as a visual aid that takes advantage of the cognitive capabilities of the human mind and eliminates the boredom and high costs involved with heavy automation achieving instead a tolerable level of human engagement with significantly increased efficiency. The approach presented is new and delivers substantial gains in productivity. The software …

Isoparametric Finite Elements For Axisymmetric Solids, Ramanand R. Shetty

Theses

The finite element formulation of axisymmetric plane stress analysis is used to develop a computer program for numerical implementation. The basic relations used to derive the finite element equations for a solid continum are reviewed in the thesis. The programming organization is summarized and program list is given in Appendix.

The program portion for isoparametric elements are borrowed from Numerical Methods in Finite Element Analysis by K. J. Bathe and E. L. Wilson, and various other subroutines are used from Mr. Huang's thesis on Micropolar elasticity analysis. Mr. Huang's computer program is based on the work done by Dr. Nakamura …

On Radial And Rotational Spring Constants Of Piping With Square Tubing Attachment, Hson-Chih Sun

Theses

Numerical values and analytical expressions for spring constant in the radial direction, and rotational spring constants in the circumferential and longitudinal directions of piping with square structural tubing attachment are presented.

Following Bijlaard's approach, the double Fourier series solution for the thin shell equation are used to express these spring constants as a function of internal pressure, q, and pipe-structural tubing parameters, such as alpha (piping length/radius), beta (tube size/pipe dia.), gamma (pipe radius/thickness) and thickness of the structural tubing. Numerical results of these spring constants are presented in tabulated form. These Tables include a set of eight standard square …

Chebyshev Approximate Solution For Stiff Problems, Kwo-En Hoh

Theses

Chebyshev polynomial and collocation methods are adapted to solve general ordinary differential equations ( initial-value problems and boundary-value problems ). Approximate solutions of initial-value problems are obtained in step-by-step fasion. the solutions have minimax absolute error in the interval and correct values at the end points. The approximate solutions of boundary-value problem will be continuous on the whole domain and have piecewise Chebyshev approximation characteristics in each subinterval of the chosen partition.

Discontinuity Stresses Analysis In Pressure Vessel, Jan-Joo Liu

Theses

In this paper, the ANSYS general purpose finite element computer aided design program was used to perform a series of stress analyses for shells with heads of various shapes.

The analysis included maximum discontinuity stresses, stress contours and displacements induced in axisymmetrical shells subjected to internal pressure loading; especially at the junction of the cylinder and heads of various shapes.

CONICAL SHELL finite elements and TWO-DIMENSIONAL ISOPARAMETRIC finite elements were used in the analysis. The results of the analyses compared very favorably with solutions derived from membrane and bending theory solutions for pressure vessels.

The effect of longitudinal and hoop …

A Study Of Hazardous Wastes Generated In New Jersey With Regard To The Siting Of Waste Disposal Facilities In The State, Shreerang Narayan Dharasker

Theses

The effective treatment and disposal of hazardous wastes is one of the most urgent problems facing the State of New Jersey today. New Jersey is the most densely populated state and is a leader in industry. Nearly every major industry in the nation is represented by one or many production units all of which generate copious amounts of hazardous and toxic wastes each year. Although the state has the toughest rules and regulations on the management of hazardous waste, there are very few options exercised or facilities cited for the effective treatment and disposal of wastes within the state boundaries. …

On Torsional Spring Constants At The Juncture Of Piping-Nozzle, Shean-Juinn Chiou

Theses

Numerical results of torsional spring constants at the juncture of piping-nozzle are studied in this thesis by using the "ANSYS" program and run on VAX computer. These results are presented in tabulated form for a piping-nozzle vessel with constant thickness of 0.375 in. Plot for the torsional spring constants in terms of beta (nozzle radius/pipe radius), gamma (pipe radius/thickness) and alpha (pipe length/radius) are also presented in this thesis. These data are under zero piping internal pressure with beta ranging from 0.1 to 0.8, and gamma ranging from 10 to 150. A numerical example with verification is also given.

Preparation And Kinetic Study Of Immobilized Enzyme Catalyst, Sanjiv S. Kuray

Theses

Degradation of commercially available immobilized Glucose Isomerase enzyme was studied in a batch reactor. Effect of shearing on the degradation was studied by comparing the performance of a basket type reactor ( with enzyme kept inside the stirrer) and ordinary batch reactor ( with enzyme kept outside the stirrer).

Invertase enzyme is available commercially in a free soluble form. It was coupled with a new kind of starch derivative. The coupling efficiency achieved was 8.7 % and the concentration of the immobilized enzyme was 718 U invertase per gram of starch. The deactivation of enzyme-starch gel was studied in a …