Digital Commons Network^™

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 …

An Inventory Model For The Specialty Chemical Industry, Paul Murchison

Theses

The specialty chemical industry is a unique segment of the chemical industry. This industry produces chemical intermediate products for the pharmaceutical, agricultural, cosmetics, and other chemically related industries. Most of the products that are produced are covered by patents or involve proprietary know—how. The specialty chemical products are a minor part of a total formulation but contribute unique properties to the end product. This feature of specialty chemicals gives the manufacturer unusual pricing power compared to producers of commodity chemicals. This industry has proven to be very competitive, profitable and in the forefront of the present automation revolution over the …

Waveform Analysis Using A Micro Computer, Dakshina K. Murthy

Theses

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

Thermal Energy Storage Using Phase Change Material With Multi - Melting Temperatures, Christakis Christodoulou

Theses

Three different models are developed in this investigation, for the study of thermal energy storage, using a phase change material with multi-melting temperatures. Using Model B as the basis, the developed partial differential equations are numerically solved by a finite difference method. Two computer programs were written based on that solution, one for the charging mode and one for discharging. Finally, using the computer programs, a set of results was obtained for both charging and discharging, utilizing calcium chloride hexahydrate as the phase change material with constant and multi-melting temperatures.

Technology Transfer Between Developed And Developing Countries, Tenny Oghogho Ogbomo

Theses

The problems arising from technology transfer, in general, are not new. The problems of the East-West technology transfer, for example, are based on the risk that such transfers will enhance the military capability, or at least the military potential, of the trading partner. In the case of United States trade with the Soviet Union, it can be said that any accretion in the Soviet military capacity weighs against the United States in an overall world-wide balance of power. The restrictions and/or prohibition of such transfer of technology are problems themselves.

The North-South technology transfer, in other words, the technology transfer …

Replacement Of Surface Ducted Rays Near Caustics With Guassian Beams, Carlos Javier Ruiz

Theses

Conventional approach to a solution of a wave propagation problem in an inhomogeneous medium is to utilize either rays or modes to represent the wave field. Asymptotic ray theory (ART) starts to fail in the vicinity of caustics due to rays experiencing many reflections. Even uniform representations do not properly correct this deficiency of rays when caustics start to pile up in the far range. One possible alternative is to replace these rays with modal bundles and remainders [1]. A promising technique using Gaussian Beams has been used to represent the total field due to a point or a line …

Effects Of Physical Exertion And Caffeine Ingestion On Mental Performance, Alireza Shafiei

Theses

Stresses in man-machine systems can be broadly classified as (1) physical and (2) mental. Both types of stresses generate some kind of response in the human body. These responses could be physiological (quantitative) or behavioral (qualitative). While the physical stresses mostly create physiological changes, mental stresses may cause physiological and/or behavioral changes. The purpose of this study is to investigate such influences, and try to determine if stimulants such as coffee have any effect on people's ability to perform tasks involving a combination of physical and mental elements.

An attempt has been made to describe an interrelationship between physical exertion …

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 …

An Analysis Of Carrier Facilitated Transport In Liquid Surfactant Membranes, Pei-Jen Tsai

Theses

Mathematical models describing the mass transfer through facilitated liquid membranes are proposed and solved analytically. A self-adjoint operator method is applied to solve the coupled differential equations with discontinuity in the boundary conditions. It is assumed that equilibrium of the solute at the interfaces is maintained during the separation process. The effects of film resistance are studied/ and a first order kinetic model is used to simulate the reaction which takes place at the membrane-internal phase interface.

Experimental results indicate that the model with external film resistance consideration is in good agreement with the experimental data. This shows that most …

Multi-Channel Arrhythmia Analysis In The Clinical Exercise Electrocardiogram, Shi-Xiong Yang

Theses

This thesis studied methods of using 2 channel ECG signals for noise elimination and arrhythmia detection. Clinical data were recorded from patients stress tests and were stored on diskettes for off-line processing. Spatial velocity vector and noise estimation methods in addition to analog and digital filters were combined to remove the noise produced from different sources. Feature extraction and matched filter methods were employed for classification of normal and abnormal QRS complexs, while rhythm computing was used in addition for PVCs and other arrhythmia discrimination. This algorithm was tested on clinical stress test recordings and a computer simulated arrhythmia recording …

Plate Stress Analysis By The Finite Element Method, Wen-Jung Chuang

Theses

The finite element formulation of plate elasticity is presented and is employed in the development of the formulation of element stiffness equations. The programming structures are also summarized.

The finite element program PLATE cited from Prof. J. N. Reddy's " An Introduction to the Finite Element Method " has been used to solve the plate bending problems with quadrilateral elements. The problems solved are:

(1) deflections and stresses in a circular plate with all edges simply supported under uniform load.

(2) deflections and stresses in a circular plate with all edges clamped under uniform load.

each case including four different …

College Relations : A Total Recruiting Strategy, Donald Roderick Hunt

Theses

Problem Statement

The MMH Corporation has a very experienced but older engineering population. It is management's desire to replace the engineering population as its members retire by two methods:

1. The recruitment of experienced engineers with key skills for various critical positions.

2. The development of an aggressive and effective College Relations Program targeted at key universities to attract a steady stream of new talent into the engineering populations.

Research Objectives

A. To determine what areas of a volatile marketplace MMH intends to compete in.

B. To determine what attracts the best new college graduates to a certain company as …

Laminar Flow In A Porous Pipe With One Plugged End, Pyne-Hwa Ku

Theses

A steady laminar flow through a co-cylinder porous pipe with one plugged end was investigated theoretically to obtain velocity, pressure and shear stress distributions.

An integral momentum equation and the Darcy's law for flow through the porous wall were solved numerically by the Runge-kutta method.

As the fluid is injected from the outer wall into the porous tube, the fluid in the inner tube is accelerated from rest at the plugged end to a fully-developed velocity profile at the exit of the porous tube. It was found that the coefficient of the wall shear stress and the dimensionless pressure drop …

Computer Aided Mathematical Modeling Of A Once Through Claus Type Sulfur Recovery Process, Yuriy Osyp Kutny

Theses

The computer aided mathematical modeling of the once through Claus process for hydrogen sulfide conversion to sulfur is presented herein. This vapor phase oxidation reaction is carried out using one thermal reactor and up to three bauxite catalytic reactors with sulfur condensers in between. The method of catalytic reactor feed reheat and its ramifications upon reactor performance and total model convergence is of major importance.

The reactor feed preheat can be carried out in either of the following ways: (1) indirect heat exchange using some external heat source; (2) indirect heat exchange using other hot process streams as heat source; …

Stress Analysis Of A Pressure Vessel By The Finite Element Method, Hsin-Te Liao

Theses

The objective of this paper is to take a finite element program, called ANSYS, to analyze the surface stress distribution of a thin-wall pressure vessel with a spherical head.

The computer program ANSYS, which primarily applies the principle of virtual work in solid continuum, has been used to solve shell problems with quadrilateral element. Problems solved are: <1> hoop stress <2> meridional stress (<)3) maximum shear stress.

In this paper, the theoretical finite element formulation of axisymmetric elasticity of the ANSYS program is presented.

Finally, some numerical examples of shells with spherical heads of various radius are given. The solution obtained from ANSYS is very …

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 …

Linearization Accuracy In Probabilistic Load Flow, Guan-Zhong Liang

Theses

This paper presents a linear load flow method which can be used for probabilistic load flow analysis. The method is based on least-square estimation. To estimate its accuracy in linear load flow calculations, the method and a previously developed linear load flow method are applied to a typical power system and the results evaluated. Comparable accuracy is noted.

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 …

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.

Implementation Of Finite Element Method On A Microcomputer, Chi-Yuang Huang

Theses

A finite-element program FEM2D has been implemented on a PHILIPS microcomputer. The program has a generation preprocessor and thus makes finite-element analysis on a microcomputer considerably easier than before, since it allows models to be created and edited much faster than by manual method. The interactive program FEM2D prompts the user to input data directly from the screen. It is convenient for the user, both in teaching and learning.

The FEM2D is a two-dimensional finite-element program capable of solving two-dimensional problems, such as plane elasticity, heat transfer and imcompressible fluid flow problems. It is developed with a formulation of a …

The Design Of An Order Processing System, Michael Montrose

Theses

The writer of this thesis was once involved in the order processing function with the company studied and recognized that there is a need for a better method of processing customer orders that could be applicable to other companies.

The company studied is considered a "high tech" company, meaning that it is engaged in the design; manufacture, and sale of the latest state of the art products that employ modern computer technology. It is ironic that this company, on the leading edge in its field; is in great need of reform in the office methods used to order its products. …

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

Theses

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

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

Theses

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

The Effects Of Platelet Activating Factor (Paf) On The Arteriolar Average Blood Velocity And Volumetric Flowrate In The Microcirculation Of The Hamster Cheek Pouch, Patricia Ann Shatynski

Theses

The effects of platelet activating factor (PAF) in vessel diameter, average red blood cell (RBC) velocity and volumetric flowrate were studied in twenty-four arterioles located in the cheek pouches of nine male syrian golden hamsters. The observed vessels were between 8-32um in diameter. These vesgs were subdivided further into two groups: 8-17um and the 21-32um group. Fluorescein isothiocyanate (FITC) labeled cells were injected into the hamster to act as velocity tracers. Immediately prior to and for a total of 60 minutes after the topical application of 10^-7M and 10^-9M PAF, selected arterioles were video taped periodically …

An Analysis Of Different Desalination Processes, Vahe Garabed Hovsepian

Theses

The object of this thesis is to study the various modes of desalination and analyze the energy and economic requirements. The desalination methods discussed are, single stage desalination, Long tube vertical Evaporator, Multistage Flash distillation, Solar Energy method, Freezing method, Reverse osmosis & Electrodialysis.

It was found that for vapor reheat process at 350°F input 639 ft-lbs/lb product required 2.01 kw-hr/100gal. product and the total cost 51.6c/1000gal.

Not one process is best for everyone. In countries close to the equator, the solar energy method is the best. Most other countries depend on flash distillation process, etc. So we can't draw …

In Vitro Comparative Hydrodynamic Study Of Heart Valve Bioprostheses Under Accelerated Fatigue Conditions And Under Physiological Conditions, Mario Cincinat Iosif

Theses

The present study involves the use of an accelerated fatigue testing system*, and a pulse duplicator (heart simulator)*, to evaluate the hydrodynamic characteristics of cardiac bioprostheses.

The hydrodynamic performance of these prosthetic valves is compared when tested using each machine, in order to assess the determining conditions that exist for each case, and try to correlate them.

Pressure drop and pulsatile flow across valves are measured, using a real-time on-line data acquisition system, which includes, in addition to the fatigue tester and the pulse duplicator, a DC amplifier, an analog-to-digital converter and a digital microcomputer. Special acquisition software has been …

Microcomputer Local Area Network Interface, David W. Juan

Theses

A Microcomputer Local Area Network Interface system for use in the study of Local Area Network has been built and tested. The special feature of the system is data transmission/receiving and error detection/recovery. The system adapted the International Standards Organization (ISO) Open System Interconnection COSI) model. It used the star topology and implemented the physical layer, data link layer and network layer. The results of the system indicated the data communications and resources—sharing between microcomputers.

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

Theses

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

Air Pollutant Emissions From Non-Vented Radiant Kerosene Heater, Anil Kumar Mishra

Theses

Gaseous emissions from non-vented kerosene heaters can generate and create significant indoor air concentrations of various gaseous pollutants. Indoor air concentrations resulting from operating a portable non-vented radiant type kerosene heater in three rooms of size 38.7, 58.1 and 137 M³ were studied. Studies in the environmental chamber having a size of 38.7 M³ under two sets of ventilation conditions showed elevated levels of CO₂, total hydrocarbons and CO. An emission rate model was used to estimate the strength of pollutant source, for total hydrocarbons, CO₂ and CO with data reported in terms of mass …