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Mass Transfer Coefficients Determined By Simplex Optimization Techniques, Charles Ferris Callihan

Masters Theses

"The objective of this thesis is to develop a method for obtaining individual mass transfer coefficients in absorption columns. There are two assumptions which apply throughout the thesis. The first assumption is "plug flow." The second assumption is that the axial concentrations can be measured accurately enough.

The problem is approached by simulating data generated from a mathematical model of an absorption column. A response surface is defined which is a function of the individual mass transfer coefficients. The lowest point on the surface locates the individual mass transfer coefficients for the system in question.

The mathematical model of the …

Temperature Dependence Of The Formation Of An Amorphous Layer In Ion-Implanted Silicon, Gary Keith Woodward

Masters Theses

"Electron spin resonance (ESR) has been used to study the temperature dependence of the formation of an amorphous damaged layer produced by ion implantation in silicon.

Undoped silicon wafers were implanted with N⁺, Ar⁺, and Kr⁺ ions at 20 keV and dose rates less than .36 µa/cm². Implant temperatures ranged from room temperature to 250°C. ESR measurements were made at room temperature on these wafers. The only ESR signal found was that associated with amorphous silicon. The ESR signal amplitude for a given ion and temperature increased approximately linearly with dose up to …

Pollution Abatement Of Mining Effluents In The New Lead Belt Of Missouri, Walter Armando Escalera

Masters Theses

"The mining and milling effluents from the Buick Mine of the AMAX Lead Company of Missouri have produced undesirable algal growths in Strother Creek below their tailings pond. A field and laboratory study was performed to determine the characteristics of the mining and milling wastewaters, and to study the effects of heavy metals and nutrients on algal growths. Laboratory studies included: Physico-chemical analysis of the wastewater; determination of heavy metal concentrations; algal growth studies in an experimental model; and microscopic examinations of the algal growths. Field work comprised: A study of the mining and milling operations; in-plant investigations of the …

The Effect Of Gating On Soundness Of Al-Alloy Permanent Mold Castings, Dinesh Shantilal Patel

Masters Theses

"This thesis describes the step by step approach to the design of a gating system for the production of sound plate castings in permanent molds. Castings of different thicknesses were produced, utilizing various gating systems, and examined radiographically to evaluate the effectiveness of these gating systems in the production of sound castings. A gating system which allows metal to enter the mold cavity with no turbulence and which establishes proper temperature gradients in the casting will produce sound permanent mold castings"--Abstract, page ii.

Neutronics Calculations Of Two Fusion Reactor Blankets, James Edward Struve

Masters Theses

"At the present state of engineering development, the most probable fusion reactor fuel cycle will use deuterium and tritium in the reaction ²₁D + ³ ₁T → ¹₀n + ⁴₂He. This reaction is exothermic and provides 17.6 Mev of energy of which 14.1 Mev are given to the neutron. The reaction will take place in a plasma environment inside an evacuated chamber. This chamber will be surrounded by a "blanket" which will serve to transform the kinetic energy of the neutron into heat and produce tritium for subsequent use in the fuel cycle. …

Marshall Properties Of Asphaltic Concrete Containing Glass-Rich Fractions, James Joseph Schneider

Masters Theses

"The use of crushed waste glass as an aggregate in asphaltic concrete has been suggested as a means for re-using glass separated from municipal refuse. Laboratory studies and field installations have generally utilized clean glass obtained by hand sorting bottles from the other refuse and crushing them to produce a desired gradation. For this type of asphalt to be economical though, the glass fraction must be separated mechanically. For mechanically separated materials, the glass-rich fraction also contains such items as metal, bone, rubber and other non-glass materials.

The objective of the study was to determine the effects upon Marshall properties …

Sintering And Microstructure Control Of A Ferrimagnetic Mn-Zn Ferrite Spinel, Joel Keith Michel

Masters Theses

"The effect of minor additions of CaO dopant to a manganese zinc ferrite – Zn_.25Mn_.75 Fe_2.17 O_4.0 - on its grain growth and densification kinetics in air at 1250°C., 1300°C., and 1350°C. was studied. Grain growth was controlled over a range of dopant levels. At a sintering temperature of 1350°C. and time of six hours a ferrite with the smallest dopant addition was sintered to the highest density - 98% of theoretical. Under the same sintering conditions ferrites with higher dopant levels also sintered with normal growth but sintered to lower densities.

Due to discontinuous …

Stability Of Filled Cylindrical Shell Columns, Yu Wen Tsao

Masters Theses

"This experimental investigation was conducted to study the stability of filled cylindrical shell columns. Two kinds of filler materials, flower clay (florist clay) and silica sand, were investigated. The cylindrical shells were made of 2024-T3 Reynolds aluminum tubing. Uniaxial compressive loading was applied directly to the filler materials through two loading rams, one at each end of the cylinder, (no loading was applied directly to the shell). Tests for investigating the load transmitting characteristics of the filler materials were performed, and the states of the stresses existing in the cylindrical shells were then obtained.

The buckling formula for thin-walled cylindrical …

Digital Fault Calculations Of Large Systems Using Matrix Language And Generalized Equations, Saeed Abdel-Halim Khalifa

Masters Theses

"A new short circuit program has been developed for a large system. Several features have been provided to simplify handling of the system data. Various study cases are performed, efficiently, within the available computer memory. A master data bank is established from bus, feeder and transformer data. They can be modified internally to simulate various system configurations. Matrix formation is accomplished using a new sorting method and the IBM/360 Matrix Language MATLAN. A generalized set of ii ·equations have been developed and applied to calculate four types of faults.

The program consists of two phases of operations. In phase-1, input …

Break-Even Criteria For A Pulsed D-T Reactor, Kenneth Franklin Keller

Masters Theses

"To those who keep track of such things and are in a position to make predictions, it appears that the use of controlled thermonuclear reactions to economically produce electric power is well within a lifetime from now. Indeed, experiments presently being conducted are putting us closer and closer to the development and construction of demonstration fusion reactors. Understandably, the people working on such products and processes are optimistic about their results. This is as it should be if our nation is to avoid major energy shortages in the future.

Unfortunately, the tenor of this paper is pessimistic. This is not …

Use Of Radioactive Iodine Evolved Into Reactor Cooling Water To Locate Defective Fuel Elements, Carl Mozel Stroud

Masters Theses

"The relative amount of radioactive iodine evolved in reactor cooling water by each fuel element provides an excellent indication of defective cladding on fuel elements. The radioactive iodine evolved into the reactor cooling water from a defective fuel element should be higher than the average radioactive iodine evolved by other fuel elements into the cooling water by an order of magnitude or more.

Radioactive iodine with non-radioactive iodine carrier is adsorbed on DOWEX SBR resin in the iodide form. The iodide is eluted from the resin with sodium hypochlorite and extracted into carbon tetrachloride. The iodine is reduced to iodide …

A Survey Of Missouri's Water Resources Involvement, Frank R. Ellis Ii

Masters Theses

"A survey of the procedures for development of water resources in the State of Missouri reveals shortcomings in many areas. Recommended improvements include: 1) revising and publishing a statewide water plan, 2) improving methods of project evaluation and priority establishment, 3) expanding methods of citizen involvement, and 4) reorganization of state agencies and legal authority. The paper examines the history of water resource involvement by the State of Missouri, and current jurisdiction of state agencies, including procedures for review of environmental impact statements"--Abstract, page iv.

Heat Transfer Of A High Prandtl Number Oil In Laminar Flow, John Robert Lee Iii

Masters Theses

"A numerical model was developed for the purpose of studying the flow and heat transfer of a hypothetical oil in laminar flow within a horizontal pipeline. Free convection, work of compression, and axial conduction were neglected, but the fluid properties - i.e., density, specific heat, viscosity, and thermal conductivity - were allowed to vary and the effect of viscous dissipation was included in the analysis of the system.

The mathematical forms of the momentum, continuity, and energy equations require that numerical solutions be obtained with a digital computer. These numerical approximations of the partial differential equations are presented and the …

Analysis And Design For Semi-Automatic And Automatic Control Of Vehicles By Permanent Magnets, Hari K. Mehta

Masters Theses

"The analysis and design carried out in this study relates to automatic or semi-automatic lateral control of a vehicle. This is one of the three essential subsystems needed for a complete automatic control system. The other two subsystems provide longitudinal control, and intersection or lane-changing control.

The system studied employs a series of permanent magnets which have been embedded vertically in the road and spaced at an interval to be used for position reference, leading to discontinuous error signal. This system has been analyzed by classical Z-transform analysis and control models have been developed for two kinds of controls. First, …

Thermal Radiative Properties Of A Semi-Infinite Absorbing-Emitting And Isotropically Scattering Medium, Tung-Ting Lam

Masters Theses

"The development and the approximate solution to the transport equation for a semi-infinite, absorbing, and isotropically scattering medium with a refractive index other than unity is presented. The general boundary condition of diffuse and collimated incidence at the interface with emission from the medium was considered by superimposing the individual effects. In each case the apparent properties, directional and hemispherical emittance, reflectance and transmittance, were evaluated as a function of the scattering albedo and the refractive index.

An exponential kernel substitution was developed and used to obtain the approximate solution. The method was evaluated by a comparison with existing but …

Heavy Metal Concentrations In The Waters Of The Springfield Area, Missouri, Anita Louise Williams

Masters Theses

"Water samples consisting of streams, springs, lakes, deep wells, and shallow wells were collected from various locations around the Springfield area. These were analysed for concentrations of the heavy metals of lead, copper, cadmium, zinc, mercury, and iron. Heavy metal contents in the waters occasionally show local concentrations. The zinc content can be related to known minor mineralized areas around Springfield. Some iron content in the surface waters and shallow aquifers is contributed by the iron-bearing clays and pyrites in the shallow formations.

The ranges of heavy metal values in the Springfield area are in ppb: lead, 1 to 70; …

Approximate Normal Mode Method To Determine The Response Of Certain Nondiagonalizabel Vibratory Systems, Jayaram Seshadri

Masters Theses

"An approximate normal mode method is developed which permits certain normally nondiagonalizable, nonconservative systems to be solved by superposition of uncoupled coordinates.

An approximate solution for a nonproportionally damped, multi-degree of freedom system is obtained by using a perturbation technique. The system is then reduced to a proportionally damped system by means of a modification to the damping factor so that the effect of the off-diagonal terms of the modal damping matrix is included. This modification produces a damping matrix that can be diagonalized by the normal mode technique. An approximate criterion is used for the determination of the modified …

A New And Direct Process For The Reduction Of Lead Sulfide, Rolando Oscar Fernandez

Masters Theses

"The direct reduction of lead sulfide concentrates by iron was investigated. An oxygen-bearing flux was shown to be a necessary ingredient for complete reduction of the concentrate. The effects of time and temperature on lead recovery were studied. Only a trace amount of sulfur dioxide is evolved during reduction, which is in agreement with thermochemical calculations"--Abstract, page ii.

Experimental Analysis Of V-Belt Tensile Loads, John Mark Wiesehan

Masters Theses

"An experimental investigation was conducted to determine the magnitude of v-belt stresses in automotive drive situations. A constant tension belt test apparatus was designed and fabricated using a variable speed cradled D.C. motor for power and two automotive alternators for absorption.

Free span stresses on the dynamic torque loaded belt drive were determined from the equations governing a pivoted drive system. Centrifugal stress was determined by a theoretical analysis of belt motion. Bending stresses were obtained from a static test employing strain gages mounted on the top of belts with exposed cord layers. The variation in load stress around the …

A Digital Simulation Of A Single Articulated Rotor Helicopter, Joseph William Klahs Jr.

Masters Theses

"The investigation was concerned with the development of a complete digital computer simulation of a single articulated rotor helicopter. The simulation program was executed on an IBM model 360-50 digital computer.

The main rotor was analyzed by the consideration of a continuous rigid blade at six azimuth stations, while the airframe aerodynamics were treated in the conventional manner. The differential equations of motion of the airframe were solved in a step-wise fashion by approximating time dependent functions with cubic interpolation polynomials.

The study concluded that there was strong evidence that suggested the possibility of treating main rotor flapping as a …

A Comparison Of Three Urban Hydrology Models, Richard F. Astrack

Masters Theses

"Three models, the British Road Research Laboratory Hydrograph Method, the Hydrocomp Simulation Program, and the HEC-1 Flood Hydrograph Package, are applied to the Boneyard Creek basin. Comparing the ability of these models to reproduce the observed peak discharge, time of the peak, and the first runoff volume determines the accuracy of these models"--Abstract, page iii.

A Highway Rest Area Design Based On A Use Study In Outstate Missouri, Dimitris Peter Perandakos

Masters Theses

"The limited number of rest areas in the State of Missouri does create a major problem for the motorist travelling in this state.

The author became more aware of this problem from personal experience and decided to investigate it. For that he interviewed over one thousand motorists on the only rest area that is located on 1-44, near the city of Stanton. He also took traffic counts to determine the average daily traffic volumes of Highway 1-44 and of the rest area stated above.

The data collected from the above steps was used for the design of a new rest …

A Multivariable Sampled-Data Model Of An Automobile Driver, Jose A. Bermudez

Masters Theses

"In this thesis, a multivariable system model of driver performance in the basic driving tasks is presented. The driver model described acts as a serial-process, priority-accessed, time-sharing computer. This model processes the input or output task which currently possesses the highest priority. Input tasks are represented by continuous signals sampled intermittently according to priority laws. Output tasks are modeled as simple analog processes operating on the last few intermittently generated output controls. An individual priority rule is constructed for each input and output task.

The performance of the driver in the lateral control task involves a feedforward pattern which is …

A Formal Description Of The Nova-800 Computer In Computer Design Language, Ronald Lee Engelbrecht

Masters Theses

"This paper presents a formal description of the operation of the NOVA 800 in Computer Design Language (CDL). For simplicity, the description does not include specific input/output devices, the multiply/divide option, or data channel operations. The description is intended to be used as a supplement in a basic course in computer organization, and an example of its use is included"--Abstract, page ii.

Interior Noise In Military Helicopters, Charles E. Perez Jr.

Masters Theses

"The Temporary Threshold Shift (TTS) or temporary hearing loss caused by excessive interior noise in military helicopters results in a critical degradation of the acoustically unprotected infantryman's ability to detect the existence or the approach of the enemy by hearing under combat conditions. The overall problem of noise reduction in helicopters consists of: (1) identifying the various noise sources, and (2) employing appropriate noise control techniques. Identification of the source is accomplished by the frequency correlation of 1/10-octave band analysis of the interior sound levels measured within the helicopter cabin with near-field sound generated by the sound sources. Reduction of …

A Study Of The Ability Of Water Treatment To Remove Trace Organics, Daniel Lee Oliver

Masters Theses

"The purpose of this investigation was to study the ability of water treatment processes, especially coagulation and chlorination, to remove trace organic materials from raw river water. Trace organic concentrations were determined using the Organics-Carbon Adsorbable (O-CA) technique, a miniaturized Carbon Adsorption Method (CAM).

Missouri River raw and treated water, obtained on 3 different dates at the Jefferson City, MO, water treatment plant, was used. The effect of various treatment steps, including settling, softening with lime, coagulating with copperas or alum over a range of doses, and chlorinating at the dose necessary to give a free residual of 2 mg/1 …

The Simulation Of A Production Control System, Steven Craig Weis

Masters Theses

"In an attempt to simulate a production system a typical company was assumed, and mathematical models of its functions were structured to form a total model. This model was programmed into an IBM 360/50 computer. A program which included seasonal trends and random requirements for various departments was designed that would evaluate all the available alternatives and output the two best production schedules such that operating costs would be minimized and the company labor force would remain nearly constant. These schedules detail the manpower requirements by week, department, line, job and shift.

To accommodate the seasonal trends, various forms of …

Design Of An Analog-Temperature Control System For An Expansion Cloud Chamber, Andrew C. Tebelak

Masters Theses

"This thesis describes the design, construction, and application of an analog control system for the temperature control of an expansion cloud chamber. During the expansion, the sample gas and the chamber walls are cooled at the same rate so as to maintain adiabaticity. The control system measures the wall temperature with transistor temperature sensors, calculates the gas temperature from the gas pressure using the adiabatic gas law, and generates a control signal proportional to their difference. The control precision is sufficient to allow the chamber to be used in the study of atmospheric phenomena.

The chamber is a ten-sided right …

A Study Of Rf Induction Heating And Float Zone Refining Of Silicon, John Allen Reynolds

Masters Theses

"Float zone refining using simultaneous RF induction heating and electromagnetic levitation has proven to be the best technique for producing high purity silicon for the semiconductor industry.

A study of the power requirements for floating molten zones, of load to source impedance matching, and of considerations for RF heating coil design was conducted to determine possible methods of improving the technique. It is shown that the power requirements are within reason, that impedance matching can be improved by varying network parameters, and that certain vital items must be assured in the design of different RF heating coils.

It is believed …

Multispectral Analysis Of Erts Imagery By Color Enhancement, John F. Peters

Masters Theses

"The Earth Resources Technology Satellite (ERTS) program has supplied the scientist with high resolution multispectral imagery of a large portion or the earth. Photographic and electronic methods of image enhancement are not universally available to those who might profit from such endeavors.

Diazo products were found to be satisfactory for creation of false color enhancement of ERTS multispectral data. The purpose of the enhancement was to make the Diazochrome composite comparable to more sophisticated methods for the purpose of interpretation. The basis of the enhancement was the standard false color infrared composite, with negative and positive Diazochrome masks to enhance …