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Determination Of Transient Temperature Stresses In Plates, Teh Yu Hu

Masters Theses

“The purpose of this thesis is to determine the transient temperature stresses in two-dimensional plate structures restrained against rotation at the ends but not restrained against elongation. In this investigation, only one-dimensional heat flow is considered. The heat flow is first treated as a problem in pure conduction and then the effects of convection through a boundary layer are considered.

The differential equation of transient heat conduction is solved by Fourier series and Duhamel’s theorem, and a graphical method of solution for temperatures in terms of dimensionless parameters is presented.

Solution of this problem is valid for a semi-infinite plate …

Effect Of Internal Pressure On Compressive Buckling Stress Of A Cylindrical Shell Under Eccentric Loading, Chao-Ping Chu

Masters Theses

“In this paper, an investigation was made of a thin- walled cylindrical shell under compressive load with various eccentricities and internal pressures to study the effect of the internal pressure on the compressive buckling stress of the shell.

So far, theoretical methods have not been devised to solve this problem; therefore, an experimental study was carried out. The experimental results indicated that the buckling load of the shell decreases as the eccentricity increases, that the buckling stress increases as the eccentricity increases, and that the change in buckling stress increases with an increase of internal pressure and is very nearly …

The Effect Of Plastic Deformations On Grain Boundaries., Jayendra Jamnadas Shah

Masters Theses

"The purpose of this study is to determine the effect of the plastic deformations on the grain boundaries and the grain structure of mild steel. Five beams tested were of A-36 steel and of 6 WF 20 rolled section. Central loading was used to develop a plastic tinge at the cent1:1r.

At the center, where a plastic hinge was formed, the effect of the plastic deformations on the grain structure was severe in all the samples taken from the tension side of all plastically or partially plastically loaded beams. In fully plastically loaded beams this effect had spread on both …

The Effect Of A Lubricant On Tool-Workpiece Interface., Kenneth Eugene Spencer

Masters Theses

"The purpose of this study was to compare the effects of cutting fluids and the method of application to an orthogonal cutting process.

The cutting operation was performed on a lathe. The fluids use d were compressed air and a solution of emulsifiable oil and water.

The flooding of the area was produced by directing a copious supply of fluid over the cutting a rea. The directed stream was obtained by pumping the fluid through a small hole drilled into the tool holder, immediately above and behind the tool face, which directed the fluid at the tool-chip interface.

The results …

The Irish Plumbing And Heating Engineer, January 1964 (Complete Issue)

Building Services Engineering

No abstract provided.

Characteristics Of Instrumentation Personnel In The Aerospace Manufacturing Industry Of The New York Metropolitan Area, Kennith Glenn Gordon

Dissertations and Theses @ UNI

As the aerospace manufacturing industry of the New York Metropolitan Area becomes more deeply involved in industrial, scientific, and military activities, it seems reasonable to expect a corresponding growth in the knowledge and understanding of that industry by the engineering and education professions alike . The engineering profession would require an accurate description of the technical character, while the education profession would be concerned with developing a better understanding of the educational ramifications of this new industry. A study of the entire industry would have required the use of resources beyond the power of the writer. However, it was decided …

Thermal Resistance Of Bonds And Contacts, David Marion Lewis

Masters Theses

"The adhesive and sealant Industry has more than kept pace with our rapidly expanding technology of today. This growth has left the standardization of data on adhesives far behind and lack of this data is obvious. Of the many applications, particularly as related to space technology and energy conversion, the resistance to the flow of heat offered by the bond layer is of considerable importance.

Little information is available on the effect of adhesives on heat transfer. In connection with their work on honeycomb panels, Rankle, Gier, and Bevans (7) determined the thermal resistance of the particular type of adhesives …

Compensator Design For Unity Feedback Systems Using An Analytical Method, Chang-Yu Wu

Masters Theses

“In control systems engineering it is frequently necessary to compensate a fixed plant whose transfer function cannot be changed. Usually the characteristics of the resulting system are established in terms of steady-state and transient performance specifications. Generally it is necessary to insert a compensator which insures stability as well as satisfies the specifications.

In this thesis an analytical method is developed to determine the transfer function of the compensator in order to satisfy the following set of specifications. The fixed system is assumed to contain one non-linearity, saturation. The input to the saturable device is constrained in a statistical …

Experimental Evaluation Of Thermal Stresses On The Outer Surface Of A Thick-Walled Tube., Vinodray T. Patel

Masters Theses

"In this investigation an attempt has been made to measure thermal stresses on the outer surface of a thick- walled tube. The inside surface was heated by steam passing through the tube while the outer surface was cooled by water. Two temperature compensated strain gages were used to measure strains in the tangential and axial directions respectively. The advantage of using this type of strain gage is to avoid the use of a dummy gage to compensate for the temperature effect.

The analytical solution to the problem was derived and the values of thermal stresses were calculated theoretically and compared …

The Anodic Dissolution Of Zinc In Nitrate Solution., Jo Lisle Reed

Masters Theses

"The increasing demand for protective metals as coatings and non-corrosive alloys has stimulated extensive research on the fundamental behavior of metals in corrosive media.

One of the problems still unsolved is the nature of the mechanism of the anodic dissolution of metals like zinc, magnesium, beryllium, cadmium, and aluminum in aqueous salt solutions. Several schools of investigators have proposed different and opposing theories to explain the discrepancies which often arise between coulometric data and the weight loss of metal electrodes in certain salt solutions.

The purpose of this investigation was to obtain experimental data for the anodic dissolution of zinc …

A Study Of Rotational Critical Speeds For A Multi-Mass System By Influence Coefficients, Kantikumar G. Patel

Masters Theses

"In this investigation an attempt has been made to determine the critical speeds of a multi-mass rotational system by using influence coefficients. Modes of vibrations are also examined at these critical speeds.

A shaft carrying five masses, supported by bearings at the ends, has been studied analytically. The length of the bearings is considered small with respect to the shaft length and therefore, the configuration is assumed to be point supported as a simple beam. The five masses, each weighing one pound, were placed at equal distances of 10 inches on a 60 inch shaft. The critical speed was examined …

Minimum Frictional Characteristics Of Optimum Journal Bearings., Navinchandra F. Shah

Masters Theses

"This investigation was conducted to develop a graphical representation to determine the optimum bearing conditions for minimum friction and to establish a theoretical approach for journal bearing design.

A series of graphs has been plotted for· the coefficient of friction versus the eccentricity ratio based on the. Sommerfeld number derived from Reynolds' differential equation, f or optimum journal bearings.

The results obtained in this research have been compared with those developed by other investigators. This comparison confirms the validity of the results presented in this thesis, so that it could be used advantageously for the design of optimum journal bearings"-- …

The Irish Plumber And Heating Contractor, November 1963 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, September 1963 (Complete Issue)

Building Services Engineering

No abstract provided.

Heat Flux Measurement By Miniature Calorimeters, Gary Rex Coffin

Theses and Dissertations

During recent years an increasing number of technical firms and manufacturers have begun to specify heat flux, energy input per unit area per unit time, as a testing and designing criteria. This change in the boundary condition (to heat flux from temperature excess or others) evolved from the idea that each material has a characteristic burning temperature. Therefore, the rate of ablation or burning depends mainly upon the rate of energy input into the specimen, and not its temperature. Thus, the need for a flux measuring device became more acute.

Radiant Flux Distribution From Concave Radiation Sources, Richard K. Duke

Theses and Dissertations

In order to analyse the radiant heat transfer characteristics of a concave source, two vital concepts must be clearly understood. The first is called the apparent emissivity Ea and is a function of both the local total emissivity E and of the geometry of the source. Although the total emissivities of ordinary substances range between zero and one, the two extremeties never occur. Surface emissivities which approach these values in the limit, must be created mechanically from materials in the range 0

The Design And Fabrication Of A Cell To Measure The Thermal Conductivity Of Viscous Fluids, Donald William Hagedorn

Theses

The purpose of this investigation was to design and construct a device to measure the thermal conductivity of viscous fluids. The thermal conductivity data obtained with this device will be used in later work on predicting film coefficients of heat transfer to non-Newtonian fluids.

A cell of the concentric cylinder type was fabricated. Main features of the cell are: two concentric bronze cylinders separated by a 1/8 inch annular space, a central water capable of producing a 10° C temperature gradient in the annular space, and two guard heaters on individual rheostats to control the end looses. The temperatures are …

Carbon Tetrachloride-Xylene Equilibria, Michael Jay Ram

Theses

The liquid-liquid equilibria of the ternary systems carbon tetra-chloride-xylene-propylene glycol and carbon tetrachloride-xylene-diethylene glycol were investigated. The effectiveness of the glycols as selective solvents for xylene was represented by a plot of weight ratio xylene to carbon tetrachloride in each phase. It was found that the diethylene glycol was the better of the two solvents at concentrations resulting in more than 75% xylene in the xylene-carbon tetrachloride rich layer. At the lower xylene concentrations the propylene glycol was found more effective as a selective solvent.

Electromotive Deposition, Storage And Dissolution Of Active Hydrogen Upon Carbon Electrodes, Joseph Gabriel Di Masi

Theses

The electromotive deposition, storage and dissolution of hydrogen upon carbon electrodes having real surface areas varying from one meter²/ gram to one-hundred ten meters²/ gram vas inves-tigated.

It has been found that a correlation exists between hydrogen storage and real area of the inner electrode. However, it has been further shown that storage of electromotive hydrogen is only for short periods of time, that is, several hours.

Equations Of State For Propyne, Thomas Marshall Stark

Theses

P-V-T data for propyne have been fit using the Martin-Hou and the Benedict-Webb-Rubin equations of state. The Martin-Hou equation, with its constants calculated from the critical properties and a vapor pressure point for the gas, fit up to 1.1 to 1.5 times the critical density with deviations of less than 1%. The Benedict-Webb-Rubin equation, with its constants calculated by the method of Joffe, resulted in greater deviations in the low pressure region than did the Martin-Hou equation; however, it also provided a better approximation of the data at high pressures and lower temperatures. The best over-all fit was obtained using …

Viscosity Of A Three Component System : Benzene-Ethanol-Acetic Acid At 20 Degrees C., 25 Degrees C., And 30 Degrees C, Alan Alvin Schetelich

Theses

The viscosity for the ternary system benzene-ethanol-acetic acid, has been determined. The viscosity maximum shown in the ethanol-acetic acid system is clearly distinguished in the ternary system as well. The viscosity minima which occur in the benzene-ethanol, and benzene-acetic acid systems are too slight to be readily apparent in the ternary system.

The ternary system viscosity was determined at temperatures of 20, 25, and 30° C. The effect of increasing the temperature from 20° C for the ternary system was to produce corresponding curves of lower viscosity. The maximum viscosity noted in the ternary system as well as the maximum …

The Electrical And Optical Properties Of Organic Semiconductors. Part 1 : Preliminary Survey And Purification Techniques, Bohdan Robert Czorny

Theses

The purpose of this work was to investigate the field of organic semiconductors and in particular to develop the means for preparing these materials in suitable condition for measurement and study of semiconducting properties. The first aspects of this project concerned with a preliminary survey of the field and techniques of ultra purification are covered in this work.

Anthracene was selected for investigation because it is the organic semiconductor most commonly studied by other investigators, and considerable published information exists for corroboration.

The preliminary survey elucidated the most promising methods of purification, which were chemical synthesis, sublimation, recrystallization from solvents …

The Corrosiveness Of Phenols, Edgar George Kaup

Theses

The effects of oxidizing agents, heat, light, and metallic catalysts on coloration in phenols is discussed, using data collected from the literature. The oxidation reaction is concluded to be the con-trolling factor in coloration. Corrosion data from laboratory experiments, field tests, and operating plants is presented for metals and non-metals in concentrated phenolic systems.

Synthesis Of Trimethyl Borate By Ester Interchange, Hugh Murphy

Theses

Trimethyl borate was prepared by transesterification of a high—boiling methyl ester with a high—boiling trialkyl borate using a metal alcholate catalyst. Interchange occurred between n—amyl borate and the following methyl esters: dimethyl sulfate, parahydroxy methyl benzoate, methyl salicylate, and methyl stearate. Interchange also took place between methyl stearate and tribenzyl borate, tri—n—propyl borate, and tri—m, p—cresyl borate. Highest yields and purities resulted from reactions involving methyl stearate. Catalysts employed were magnesium—aluminum ethylate and aluminum Isopropoxide.

Two methods of separating the methanol—methyl borate azeotrope were evaluated: sulfuric acid extraction and salt splitting. Extraction with sulfuric acid was determined to be the …

Isobaric Vapor-Liquid Equilibria System : Benzene, Chlorobenzene, Phenol, Larry Madestau

Theses

Isobaric vapor-liquid equilibria were determined experimentally for the three binary systems benzene-chlorobenzene, benzene-phenol, and chlorobenzene-phenol; and for the corresponding ternary system benzene-chlorobenzene-phenol. Constants for the Chao modified Redlich-Kistler equations were calculated from the experimental data by the method of least squares. These constants were then used to predict vapor-liquid equilibria for the ternary system. The predicted values showed satisfactory agreement with those found experimentally.

A modified Ellis still was used for obtaining equilibrium data. Samples of vapor and liquid phases were analyzed by means of the F & M Model 720 vapor phase chromatograph. Benzene, chlorobenzene, and phenol used in …

Studies In Modulation Of Interfacial Reactions For Certain Sulphide Minerals, Robert Owen Beyaert

Bachelors Theses and Reports, 1928 - 1970

No abstract provided.

Kentucky Highway Conference Program [1963], Kentucky Transportation Center

Kentucky's Annual Forum on Transportation

No abstract provided.

Concrete, Bridge Decks: Deterioration, Coatings And Repairs, James H. Havens, William B. Drake

Kentucky Transportation Center Research Report

This report is not wholly a culmination of a planned or programmed research project. It is a historical account of damage sustained by both new and old concrete bridge-decks -- through freeze-thaw, salt action, etc, -- and of some expedient repairs which have been effected. The problem of durability in concrete bridge-decks has become increasingly critical during the past ten years or so and is now a major concern to highway engineers throughout the northern tier of states. While there is not yet a concerted agreement in regard to the cause of the trouble, relief is being sought through improved …

Farm Safety, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

Careful investigation has been made into the causes of tractors overturning.

The most common types of accident are set out below, with advice on how to avoid them.

A Core Sampler For Silage, A L. Hamilton

Journal of the Department of Agriculture, Western Australia, Series 4

FOR five years now the Dairy Division of the Department of Agriculture has conducted a silage competition on behalf of the Australian Dairy Produce Board Pasture Improvement Committee.

The competition is for farmers in the Southwest dairying districts and has attracted an increasing number of entries each year.