Engineering Commons^™

The Effects Of Granular Size On The Thermal Conductivity Of Sand, Kanubhai M. Patel

Masters Theses

"The thermal conductivity of granular materials can be determined by the Thomas method. This method was used here to determine the effects of granular size on the thermal conductivity of sand. A river sand was secured and screened. The sand retained between the Tyler Standard Screen Scale, mesh 10 and 14, 14 and 28, 28 and 40, 40 and 48, 48 and 60, and below mesh 60, was used for tests.

The thermal conductivity for the above six samples obtained by the author coincide fairly well with published data.

It is reported in the International Critical Tables that the thermal …

A Determination Of The Theoretical Stresses In A Deep Beam., James William Tritz

Masters Theses

"This paper presents an analytical solution of the stress distribution in a deep beam of finite length. The beam being considered is analyzed as one of plane stress. The method employed superimposes two stress functions each of which is a trigonometric series. The first stress function satisfies all boundary conditions except that of zero stress on the vertical faces. The second function is found, so that, when combined with the first function, all boundary conditions are satisfied. The IBM 1620 digital computer is then used to find the stresses for a particular beam. The results of this analysis are then …

The Prediction Of The Thermal Conductivity Of Various Binary Non-Polar Gaseous Mixtures., Chester Foon-Chen Feng

Masters Theses

"A simple method for predicting the thermal conductivity of binary non-polar gaseous mixtures from the force parameters of the pure components and composition was developed. The method is an extension of the application of the combining methods previously derived for viscosity predictions. Altogether, the published thermal conductivities of 683 binary non-polar mixtures at various temperature levels were compared with the corresponding calculated thermal conductivities resulting from the prediction method. The corresponding values predicted from Hirschfelder, Curtiss and Bird's expression were also compared.

Among the 683 binary mixtures, there were 138 di-di, di-poly, and poly-poly mixtures, 241 mono-

Influence Of Quartz Particle Size And Concentration On The Fracture Stresses Of Triaxial Alumina Porcelain., John David Weyand

Masters Theses

"Quartz particles were introduced into a typical triaxial alumina porcelain. Three levels of particle size and three levels of concentration were studied. The strength sample sizes were large. A diametral- compression loading method was used for strength testing. It was found that the porcelain strength decreased with increasing grain size and concentration of quartz particles. A linear relationship existed between log quartz concentration and mean fracture stress"--Abstract, p. ii

Radiation Characteristics Of A U-Slot Antenna., Richard Paul Brueggemann

Masters Theses

"The radiation equations for a simple rectangular slot antenna are derived as a function of the field distribution in the slot. The electric field distribution in the slot is then formulated as a function of the aperture dimensions. The U-shaped slot antenna is described as an extension of the rectangular slot theory and the actual field is measured in the slot for comparison.

The far field equations a.re derived for the U-slot antenna similar to those for the rectangular slot antenna and are evaluated using the formulated distributions in the slot for antennas of two different electrical sizes. The equations …

The Importance Of Radiation As A Means Of Controlling Surface And Internal Temperatures Of A Semi-Infinite Solid, Kenneth C. Woodruff Jr.

Masters Theses

"This problem is concerned with the temperature history of a semi-infinite solid bounded by one flat surface.

Heat was applied by convection from a hot fluid to the flat surface of the solid which was originally at a uniform temperature. Heat was radiated from the flat surface to black space and conducted into the solid according to Fourier's law. The temperature at the surface, and at several points beneath the surface, was determined as a function of time.

A method for solution of such a problem is demonstrated here by the use of numerical analysis and the Royal McBee LGP …

Analysis Of Space Frames By Moment Distribution., Ting-Hwa Wang

Masters Theses

"This work presents an analysis of space frames and planar frames loaded in different planes by the method of moment distribution and the theory of superposition. From this analysis it is found that the torsional stiffness of frame members has a great effect on the final bending moments when twisting moments are applied to the frame. The analysis of space frames considering the forces, stresses, and moments in all three dimensions always yields a design more accurate and economical in material than the traditional planar frame analysis"--Abstract, p. i

Investigation Of Zero Sidesway For Rigid Frames, Dolatray S. Mehta

Masters Theses

"This study was made to determine the location of a point at which a vertical load may be applied to a rigid frame structure and produce zero sidesway, the so called zero sidesway axis. For concentrated loads equations have been derived for zero sidesway. For uniform and triangular loads graphs showing zero sidesway for various ratios of column and beam stiffnesses and height ratios have been plotted"--Abstract, page ii.

Synthesis Of Unity-Gain Rc Networks From Second Degree Transfer Functions., Ronald L. Mcnally

Masters Theses

"A synthesis procedure is presented which realizes second order open circuit transfer functions. This procedure is developed using parallel networks. The transfer functions for each parallel network are obtained by use of separation parameters. Two constraints are used in the development: first, the realized network must be an RC network; second, the desired multiplicative gain constant must be realized. With these constaints a parameter space is developed which aids in the selection of the proper parallel networks to be combined. Necessary and sufficient conditions are developed which are used to test the transfer functions. The realization simply consists of the …

Influence Of The Heat Release On Thermodynamic Characteristics Of Diesel Engines., Shirish Amritlal Desai

Masters Theses

"A Diesel. engine is an internal. combustion engine in which the fuel. is ignited by the heat of compression. Thus, the Diesel. engines are known as compression-ignition (C.I.) engines. The engine received its name: from its inventor, Dr. Rudolf Diesel., who in 1893 published a book under the title, '' Theory and Construction 0£ Rational. Diesel Engine". The first successf'u1 Diesel. engines, using liquid: fuel., which was injected into the cylinder by a blast of high-pressure air, were manufactured by the M.A.N. Company of Germany in 1895"-- Introduction, p. 1

The Effect Of Gap Graded Aggregate On The Properties Of Hot Mix Asphaltic Concrete, Maurice L. Northcutt

Masters Theses

"The objective of this investigation was to determine the effects of deviations from the recommended gradation of aggregate upon asphalt concrete mixes. The aggregate used in this study was a good grade Missouri Limestone and was mixed with an asphalt cement of 85-100 penetration grade. A control mix was designed in accordance with the Marshall Method using a gradation recommended by the Asphalt Institute. Ten aggregate blends were prepared by wasting certain fractions or combinations of fractions and the wasted weights were redistributed into the coarser or finer aggregate sizes. The test mixes were designed using the same method and …

The Prediction Of The Viscosity Of Multi-Component Non-Polar Gaseous Mixtures At Atmospheric Pressure., Gary D. Fehsenfeld

Masters Theses

"The applicability of the Strunk, Custead, and Stevenson method for predicting the viscosities of multicomponent, non-polar, gaseous mixtures vas investigated. The viscosities of 24 ternary and quaternary gaseous mixtures were experimentally determined, at 3 temperature levels, and compared with the corresponding calculated viscosities resulting from the prediction method. In addition, the published viscosities of 64 multicomponent mixtures were compared with the corresponding calculated viscosities.

Altogether, the viscosities of 136 multicomponent, non-polar, gaseous mixtures were compared. The mixtures contained from 3 to 7 components including 16 different gases in the temperature range from 5• to 1014 ° c, and at a …

The Submerged Culture Of Thiobacillus Thio-Oxidans In A Pilot Scale Fermentor, Edward Hibbert Crum

Masters Theses

"A strain of Thiobaci.llus thiooxidans was isolated from a West Virginia coal mine drainage. This strain was characterized by its production of sulfuric acid in shake flasks. The strain was also compared with a pure culture of h thiooxidans obtained from the American Type Culture Collection (ATCC number 8085).

The strain was grown in submerged culture in a 16-liter pilot scale fermenter. Two aeration systems, air and air enriched with carbon dioxide, were examined. The air enriched with carbon dioxide gave a much more rapid growth rate. The culture reached the mid-log phase of growth after 80 hours of incubation …

Investigation Of Inoculant Effect On Cast Iron, Darrell W. Donis

Masters Theses

"An assumption was made that extensive holding time of an inoculated gray iron melt would result in a loss of physical properties of castings poured from this melt. This theory was examined in both a literature search and by testing and conclusions drawn from these findings are presented and discussed. Although there is a great deal of data available which discusses inoculants and their effects, very little mention is made of the effect of holding time in any of this material. The results indicate that holding time is of considerable importance when dealing with inoculated iron, and that calcium silicon …

Ignition Time Lag: A Measure Of Explosive Energy Release, Paul H. Rydlund

Masters Theses

"By means of the resistance-element, or probe-wire, detonation-velocity measurement technique, explosive reactions from various blasting agents were studied. To reduce the number of variables, only standard AN-FO 94/6 mixtures were used, as are commonly employed today in constructions and mining operations. Accuracy of the data obtained was excellent, and the method proved itself not only relatively simple to operate but versatile in providing considerable information under many testing conditions. Studies of test records revealed the presence of a time-lag frequently occuring [sic] after primer detonation. Environmental factors such as confinement, charge diameter, primer size and energy content, and surface coatings …

An Investigation Of The Adaptability Of The Linvill Model For Transistor Synthesis, John A. Reagan

Masters Theses

"The Linvill transistor model may be used for transistor synthesis if the model accurately approximates transistor response and may be readily simulated on an analog computer. Experiments were performed on a transistor to determine the Linvill model parameters. The transistor's large-signal transient response was investigated by pulsing the emitter with a current that drove the transistor from the active region of operation into saturation. The same problem solved experimentally was then solved analytically by replacing the transistor with the Linvill model. The experiment was then simulated on an analog computer by using the equations that govern the Linvill model's response. …

On Optimum Receiver Using Decision Theory, Philip T. Tai

Masters Theses

“In recent years communication engineers have given increased attention to the study of communication through random media. The name random is used to describe a medium the properties of which are stated only in a statistical sense. For example the impulsive response of a certain medium may only be known as one of an ensemble of possible impulsive responses; the particular member of interest being drawn up according to some statistical rule. In other words there exists some "uncertainty" concerning the characteristic description of the medium. Significant work on these problems has been done by Price and Turin. Related work …

An Analysis Of The Simulated Inductande Obtained From Forward Biased Semiconductor Diodes., Everett Harold Vannoy

Masters Theses

"The problem undertaken in this thesis is to study the simulated inductance observed in forward-biased abrupt junction p-n diodes with a highly doped p region and a nearly intrinsic n region and show that it is due to conductivity modulation. Unlike other analyses of this phenomenon, a voltage step is applied to the diode in such a direction as to forward bias it and the behavior of the injected minority carriers are observed. By comparing the resultant current through the diode to the relationship predicted by the equivalent circuit of the diode, an expression is obtained for the simulated inductance. …

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 …

The Dissolution Of Deformed Magnesium In Sulfuric Acid., William J. Daniels

Masters Theses

"The negative difference effect exhibited by magnesium while anodically dissolving in saline solutions has been attributed in part by Kokoulina and Kabanov to the expulsion of univalent magnesium ions ^{1, 2}. Recent experimenters have discounted the concept of the anodic expulsion of uncommon valency ions and have explained both the positive and negative difference effects observed for magnesium in dilute acids on the basis of anodic polarization, film disruption, and disintegration of the magnesium anode, i.e. "chunk effect"^{3, 4}.

The purpose of this present investigation was to study the difference effect for deformed magnesium in a dilute …

The Indole Acetic Acid Oxidase Of Hygrophorus Conicus., Dilip N. Patel

Masters Theses

"The purpose of this investigation was to determine an assay method for measuring the activity of the indole acetic acid oxidase present in Hygrophorus conicus. This enzyme converts tryptamine or indole acetic acid (IAA) into oxindole acetic acid (OIAA).

An assay method for measuring the activity of the enzyme was developed based on the spectrophotometric measurement of tryptamine, IAA, and OIAA. Several other assay methods were tried. The colorimetric method of Gordon and Weber ^(l4) was found to be useful for a quantitative determination of IAA and was insensitive to OIAA. Paper chromatography proved to be useful as a qualitative …

A New Method For The Evaluation Of Metal Primers., Bhalchandra Dave

Masters Theses

"Corrosion is the destructive attack of metal by chemical or electrochemical reaction with its environment. Rusting is usually the term applied to the corrosion of iron-base alloys with formation of corrosion products consisting largely of hydrous ferric oxides. Non-ferrous metals therefore, corrode but do not rust. ^(l4) More than 40 per cent of the world's production of steel and iron is destroyed by rusting which costs about six billion dollars every year. In 1954 the American Petroleum Industry, Subcommittee on Corrosion, published a preliminary estimate that corrosion was costing 2 the petroleum refining industry between eleven and nineteen cents per …

Forced Convection Heat Transfer Coefficients And Induction Heating, Max Edwin Light

Masters Theses

“The purpose of this study was to design and build an apparatus to experimentally determine the convective heat transfer coefficients for water flowing in a horizontal tube at turbulent flow. Also it was planned to use the apparatus to investigate the spatial dependence of energy deposition by induction heating.

An instrument and measuring techniques were developed that gave reasonable correlations between experimentally determined heat transfer coefficients and values calculated from generally accepted heat transfer relationships developed by other experimenters. Most of the calculated values were within ± 10% of the experimental values for a wide range of flow rates.

It …

The Effect Of Cation Size Of Xanthate Collectors In Sulphide Flotation., R. W. Bourne

Masters Theses

"Batch flotation tests on Utah Copper ore were used to show the effect of collector cation size.

The results obtained were:

(1) Recovery of copper in the concentrate decreases with increase in the size of the collector cation.

(2) Increased recovery with ethyl over that for amyl with a given cation.

(3) No beneficial recovery with sulphur enriched xanthates.

Statistical techniques were used to ascertain if significant differences in results were present"--Abstract, p. i

The Effect Of Moisture Content On The Action Of Sea Coal In Molding Sands., Robert J. Endres

Masters Theses

"An assumption was made that an increase in moisture content in the sand would result in an increase in the amount of volatile matter retained in a sand, clay, water, and sea coal mixture which had been subjected to the heat of molten iron. Because of a lack of positive evidence to support this assumption, it was concluded that the volatile matter retained within the sample is independent of the moisture content.

It was also shown that the volatile products do not travel back through the sand, away from the mold-metal interface. Rather, the volatiles escape from the sand and …

The Removal Of Residual Organic Materials From Sewage Plant Effluents Using Continuous Foam Flotation., Ajab S. Malik

Masters Theses

"This investigation was conducted to determine the feasibility of using a continuous foam flotation process for the removal of soluble organic materials from sewage treatment plant effluents. All effluents contained alkyl benzene sulfonates (ABS), derived from synthetic detergents. The studies were conducted on a laboratory scale. The reduction in the chemical oxygen demand was used as a measure of the effectiveness of the removal of the organic materials. In addition, ABS determinations were employed to study the fate of the detergent.

A flotation cell, equipped with the means of controlling the air and liquid flow rates, was used. Air flow …

The Resolution Of Two Known Signals In White Gaussian Noise., Peter Cheng-Fang Wang

Masters Theses

"The problem of resolving two signals F1(t) and F2(t) in white Gaussian noise n(t) is treated here as a problem in statistical decision theory. We assume a situation in which one of two similar signals is present and an observer is asked to make a decision concerning which of the signals is present with a tolerable probability of error. The observer is allowed to use the best system which he can design for this particular purpose. Of course, this observation will be disturbed by noise and therefore, the observer is led to ambiguous selections. It is apparent that the optimum …

Optimum Zero-Memory Nonlinear Filter, Benjamin Shaw-Hu Wang

Masters Theses

“The purpose of this report is to review the basic work described by Zadeh insofar as systems of class N₁ are concerned and to apply his general results to a specific problem in which a non-linear filter is mandatory simply because the linear filter is essentially ineffective. The ineffectiveness stems from the fact that the autocorrelation function of the signal plus the noise has essentially the same variational character as the signal alone. Therefore, the transfer function of the linear filter turns out to be simply a constant. Thus, the output of the linear filter is just an attenuated …

The Plastic Behavior Of Beams With Butt Welded Connections., Paul George Hayes

Masters Theses

"The purpose of this study is to determine the length of butt welds required to develop the full plastic section modulus of a 6 WF 20 rolled section of A-36 steel. The members were electric arc welded with LR 6070 electrodes. Two-point loading was used to develop a zone of pure moment with zero shear where these members were joined.

At the cross-section to be welded, all the flange edges were prepared to receive a single-vee butt weld and the webs were prepared for a double-vee butt weld. In all cases the full length of the flange was welded. However, …

A Laboratory Study Of The Effect Of Wettability Of Residual Oil Saturation In Artificial Cores., Socrates Nicholas Potamianos

Masters Theses

"In the past much emphasis has been placed on various studies of reservoir rock and fluid surface properties and their relation to the different oil recovery processes. Several laboratory methods (1, 2, 3) ^l/have been used by different investigators to obtain a more fundamental understanding of the many factors which have an influence on the oil recovery from reservoir rocks"--Introduction, p. 1