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Matching Of A Horn Antenna To Its Dense Surrounding Media By The Use Of Artificial Dielectric Methods, Paul Arthur Ray

Masters Theses

"The purpose of this thesis is to design an artificial dielectric slug to match a horn in a media such as water and to discuss a method of determining experimentally its dielectric properties. The design is based on known artificial dielectric methods. The method of determining the dielectric properties is by microwave waveguide reflection techniques. This thesis deals with the theoretical aspects and suggests an experimental method of determining the practicability of such a matching method"--Abstract, page ii.

Infinite Beams On An Elastic Foundation, Shi-Peing Chang

Masters Theses

"In this paper a partial differential equation for the analysis of beams resting on an elastic foundation under dynamic load is presented. A solution for this equation is derived, and solutions for various boundary conditions of infinite beams resting on an elastic foundation are discussed. The application of the equation is demonstrated by an example of a moving load traveling along an infinite beam"--Abstract, page ii.

Effects Of Internal Pressure Upon The Buckling Of Thin Circular Cylindrical Shells Under Axial Compression, Leroy E. Thompson

Masters Theses

"An experimental investigation was made of the effects of internal pressure upon the buckling of thin circular cylindrical shells under axial compression. A comparison was made of the experimental and theoretical results; the latter were derived from the large-deflection theory. Results showed that the internal pressure had an appreciable strengthening effect upon the buckling of the cylindrical shell. The comparison showed that the experimental results were lower than the theoretical results for a given internal pressure. The discrepancy between the results can be expected since there were factors not included in the theory: imperfections, end conditions, lengths, and material irregularities"--Abstract, …

Field Permeability Determination Of Partially Saturated Fine Grained Soil, Edward G. Rapp

Masters Theses

"The determination of water permeability through a soil is necessary to estimate seepage losses from small reservoirs. At the present time, the methods available to conduct this determination in partially saturated fine grained soils are expensive and in most cases not commensurate with the cost or importance of the individual structure. This investigation was conducted to evaluate the use of a proposed, potentially inexpensive field procedure in this situation. A modified borehole apparatus was utilized in field tests to determine the permeability of a partially saturated soil deposit in place. Undisturbed samples from the same location were tested in the …

Epoxy Resin Admixture For Concrete, Kuo-Chu Hu

Masters Theses

"This thesis describes laboratory tests on concrete having epoxy as an admixture. Cylinders for compression and elastic modulus tests were cured under two different curing conditions, standard laboratory cure and a simulated job cure. Beams cured under laboratory conditions were tested for flexural strength. Test results show the compressive strength increases with an increase of epoxy content for job curing conditions. However, compressive and flexural strengths of specimens cured under laboratory conditions show a slight decrease. The elastic modulus of concrete containing epoxy also decreases in comparison to ordinary concrete"--Abstract, page ii.

The Prediction Of Mix Design Properties For Dense Graded Bituminous Mixtures, Robert Ernest Weeks

Masters Theses

"The purpose of this investigation was to ascertain the feasibility of interpolating values of the physical properties of a dense graded bituminous mix between known values. Also the effects of limestone mineral filler on the properties of a dense graded mix are evaluated. The variables in this study were mineral filler and asphalt cement. Control mixes were established at 2, 6 and 10 percent mineral filler and experimental mixes were prepared at 4 and 8 percent filler. The aggregate consisted of limestone and was mixed with an asphalt cement of 85-100 grade penetration. Al mixes were tested by the Marshall …

Effect Of Single Stirrups On Reinforced Concrete Beams, Vinodbhai T. Patel

Masters Theses

"This study was made to determine the location of vertical stirrups and also to determine the amount of stirrup-steel required to prevent diagonal cracking. The study is limited to rectangular, simply supported, reinforced concrete beams subjected to a concentrated point load at the center of the span. Five sets, each containing three beams were tested. Two sets were cast without stirrups and the results were used to locate the stirrups for the remaining tests. The other three sets were cast with one stirrup on either side of the central load. Stirrups were of the "U" type and formed form No. …

The Design And Construction Of An Instrument For Calibrating Accelerometers, Richard Rabenau

Masters Theses

"The purpose of this work was to design and construct a facility to calibrate accelerometers. A ceramic piezoelectric shaker and modified Michelson interferometer together with necessary electronic equipment were used. The system produced accurate and stable acceleration at five discrete points from 1,000 to 5,000 cycles per second. the maximum calibration levels were approximately 50 g's"--Abstract, page ii.

Effect Of Calcium Lignosulfonate On Properties Of Concrete At Early Ages, Lawrence Kong-Pu Wang

Masters Theses

"The objective of this investigation was to determine the effects of calcium lignosulfonate on the physical properties of concrete. Calcium lignosulfonate used as an admixture was tested for its effect on the tensile and compressive strength of plain concrete cylinders, and for its effect on the flexural strength of plain concrete beams. The effect of the admixture on shrinkage, slump, air content and unit weight was also studied. the test results showed that calcium lignosulfonate reduces the amount of water required to make a workable concrete mix; a more workable mix saves money because it is easier to place, thus …

The Effect Of Cadmium On Anaerobic Digestion, Lyle Lynn Pruitt

Masters Theses

"The main purpose of this study was to determine the effect of cadmium on anaerobic digestion. Metal concentrations in the form of regular and slug doses were considered. The possibility of acclimating anaerobic bacteria to higher cadmium levels was studied, and attempts were made to reestablish digestive action through re-seeding in digesters overcome by high cadmium concentrations"--Abstract, page [ii].

Measurement Of Stray Load Loss Of D.C. Machines, Kanaiyalal Ramanlal Shah

Masters Theses

"For many years the standard practice, in calculation of conventional efficiency of d.c. machines, has been to include stray load losses as equal to 1% of the output. This assumption may be true for large, compensated d.c. machines but it is known to be small for smaller, uncompensated, general-purpose, industrial-type machines of open design. An A.I.E.E. Committee on Rotating Machines was formed to investigate whether the present practice of assigning 1% for the stray load loss is justified or not. They reached a conclusion, reported in 1949, after investigating 243 stray loss tests on different motors ranging from 1/2 hp …

Piezometric Levels And Shallow Aquifers, Dillon And Meramec Spring Quadrangles, Missouri, James Hugh Crouch

Masters Theses

"Little is known about groundwater in carbonate rock; quantitative data about limestone and dolomite aquifers are almost non-existent. Objectives of this study are: identification of shallow aquifers, and yield, occurrence, and piezometric level of groundwater in cherty dolomitic rocks in eastern Phelps County, Missouri. Area studied comprises of the 7.5-minute Dillon and Meramec Spring Quadrangles. The data used were derived from water well logs, interviews with well drillers and owners, and a previously available geologic map.

The Jefferson City, Roubidoux, and Gasconade formations are aquifers. Groundwater in the Jefferson City formation is perched. West and north of Dry Fork creek, …

Temperature Distribution In Thermal Boundary Layers (In Free Convection) Using A Modified Schlieren Method, Philip Ling Chen

Masters Theses

"A simple optical apparatus, the Schlieren interferometer, was constructed for the quantitative investigation of free convection heat transfer from solid bodies. The photographic results, checked by using thermocouples, were used in evaluating the temperature distribution, the key to the solution of these problems. Interpretation of the photographic results was made using the simple calculation for the conventional interferogram and the Dale-Gladstone law. Although the experiments were limited to a heated flat plate and a heated wire, two dimensional test pieces of irregular configuration can be investigated by the same apparatus with simple modifications. The photographs of the conventional Schlieren, the …

The Design And Construction Of A Shock Tube Facility, William Adolph Crede

Masters Theses

"It is the object of this thesis to give an account of the considerations necessary to design, construct, and operate a shock tube facility.

The primary purpose of the facility was to provide a means to study high strength shock waves in physics, chemistry, and aerodynamic applications.

Preliminary designs were undertaken to determine the basic dimensions and related capabilities. Final design, construction and testing of the tube itself was performed by Nooter Corporation in St. Louis, Missouri. Preliminary designs agreed rather closely with final construction.

Experimental testing was confined to the successful operation of all the various components of the …

The Effect Of Carbonate Karst Terrain On Water Quality, Robert Russell Kilgo

Masters Theses

"The ever increasing use of water and unabated pollution of streams have made necessary increased research efforts into the quality and quantity of the available national water resources. Karst terrain is prevalent in several sections of the United States, however, little work has been done on the effect of this topography on water quality.

The purpose of this investigation was to determine the effect of carbonate karst terrain on the quality of water. The Meramec spring area, east of Rolla, Missouri, was selected for study. This area was underlain with dolomite formations and contains both karst and non-karst drainage basins …

The Electrochemical Oxidation Of Crotonic Acid, John L. Cannaday

Masters Theses

"The purpose of this investigation was to explain the mechanism of the electrochemical oxidation of crotonic acid on platinized-platinum anodes at 80⁰C.

A current-potential study was conducted using the parameters of pH and crotonic acid concentration. Faradaic efficiency was determined by measurement of CO₂ production.

Oxidation occurred both in acidic and basic solutions.The Faradaic efficiency was approximately 100 per cent.

The results were interpreted in terms of a mechanism having the following characteristics.

(a) The first charge transfer is the rate determining step.

(b) The rate is the sum of the rates for two parallel reactions. In strongly acidic solutions, …

Warping And Curling Of Plain Concrete Slabs, Vipinbhai Ratilal Shah

Masters Theses

"The study was made to determine the effect of daily atmospheric temperature variation and curing on the warping and curling of plain concrete slabs and to study the effect of moisture on the warping of plain concrete slabs under nearly constant temperature conditions, by keeping the bottom surface of one slab wet and the other dry.

Daily observations consisted of dial gage readings to determine the progressive variations in warping contours due to typical daily temperature curling. Trends were found for three months of dial gage readings and interpreted in terms of warping and curling of the slabs.

The warping …

The Influence Of Cation Exchange And Electrolyte Concentrations Upon The Atterberg Limits, Kent J. Schwieger

Masters Theses

"The object of this investigation is to correlate relationships between cation exchange capacity, clay content, and type and concentration of the exchangeable cations upon the Atterberg limits of a soil. Synthetic soils consisting of loessial silt and either an illitic natural deposit, bentonite, ball clay, or kaolin clay were used.

As the percent clay fraction was increased the cation exchange capacity, liquid and plastic limits and plasticity index increased linearly in the clay range. Results also suggested a linear relationship between the liquid and plastic limits and the cation exchange capacity of soils of one hundred percent clay fraction"--Abstract, page …

Design Of Non-Uniform Linear Antenna Arrays With Digitized Spacing And Amplitude Levels, Jack F. Morris

Masters Theses

"Recent developments in space exploration have shown a need for high resolution, high gain antennas. The introduction of non-uniform linear array theory has provided a means by which arrays may be designed to produce narrow main beams with fewer elements than required by uniform arrays. A general theory has not been developed, however, and the design engineer has been left with only trial-and-error methods with which to work. In this study a technique has been developed by which non-uniform antenna arrays may be synthesized to meet a given set of specifications with reasonable accuracy. The elements of the array are …

An Investigation Of Continuous Prestressed Concrete Structures, Ping-Chi Mao

Masters Theses

"This thesis presents an analysis of the behavior of continuous prestressed concrete structures. From this analysis the governing equations for various types of geometry for prestressing cables are derived. The calculation of fixed-end moments due to the prestressing force using the equations derived is quite cumbersome, however, in order to simplify the calculations, design charts are developed. A cable with reverse curvature is analyzed using the design charts. It is shown that the fixed-end moments calculated by neglecting the effect of reverse curvature differ significantly from the fixed-end moments calculated by considering this effect. Hence the effect of reverse curvature …

The Effect Of Vegetation, Soil, And Rock Type On Runoff From Some Small Watersheds In Missouri, Anant Suthipas Narupon

Masters Theses

"A previous study of mean annual floods (Harbaugh, 1962) was based on watershed area, channel length, and channel slope of forty five small watershed in the State of Missouri. The present study investigates the effect of precipitation, soil distribution, vegetal cover, and underlying bedrock on annual peak rate of discharge. This study consists of statistical analysis by multiple correlations of additional quantitative data for nine of Harbaugh's forty five watersheds. Hydrologic data were obtained from the U.S. Geological Survey and U.S. Weather Bureau climatological publications. Distribution of vegetation was compiled from U.S. Department of Agriculture aerial photographs. Soil and rock …

A Study Of The Influence Of Shock Waves On The Stability Of Rock-Bolt Anchorage, Helmut W. Habenicht

Masters Theses

"An experimental method was developed to compare strain data for rock and rock bolts when exposed to shock waves released by blasting. During a 32-day period of experimentation, one rock sensor and four rock-bolt sensors were observed simultaneously. By their placement in the side wall of a structurally stable drift, secondary static stresses were excluded. Bolt gage responses, then, could be considered to originate only from a decay of anchorage stability during static conditions or as a reaction to the vibrations. Interpretation of test results indicated a distinct loss in bolt-strain during vibrations, accompanied by a smaller but steady loss …

The Irish Plumbing And Heating Engineer, January 1965 (Complete Issue)

Building Services Engineering

No abstract provided.

A Study Of The Work Functions Of Nigerian Industrial Technicians, Olugbenro A. Ajayi

Masters Theses

The Problem and Its Background

Introduction

A curriculum can be developed in several ways. The simplest method is to use the curriculum of another institution without modification. The hazard of such an approach lies in the possibility that the curriculum may not be a good one or, even if satisfactory for the original institution, may not fit into the conditions of the setting where it is to be used. For example, entrance requirements for institutions vary from country to country and from one institution to another.

Another method is to study a number of curriculums and develop a composite curriculum …

Equipment And Techniques For Aerial Application Of Evaporation-Reducing Monlayer-Forming Materials To Lakes And Reservoirs, Vaughn E. Hansen, Gaylord V. Skogerboe

Reports

The authors wish to express their gratitude and sincere appreciation to the many organizations and individual who assisted in this research effort. The U. S. Bureau of Reclamation has sponsored the investigation of aerial application equipment and techniques. U.S. Bureau of Reclamation personnel concerned with the evaporation reduction research program have b en most cooperative in supporting the efforts at Utah State University. The Reeder Flying Service has worked with Utah State University in the developn1 pilot of aerial application equipment since the inception of the project in 1961. Mr. Charles Reeder ha been very cooperative throughout the research program. …

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

Building Services Engineering

No abstract provided.

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

Building Services Engineering

No abstract provided.

Construction Of A Class I, Type A Surface Containing Paradise Slag Aggregate (Experimental) Drakesboro-Paradise Road (Ky 176), Robert L. Florence

Kentucky Transportation Center Research Report

The Drakesboro-Paradise Road (KY 176), extending 2.84 miles from its junction with KY 70 at Drakesboro to a point on KY 176 approximately 1.8 miles southwest of Paradise, was surfaced in early August with a 1 1/4-in, course of Class I, Type A bituminous concrete containing 40 percent wet-bottom-boiler slag from the T.V.A. power plant at Paradise, Kentucky. The use of the slag was on an experimental basis, and the objective was to determine the feasibility of utilizing the slag as an anti-skid aggregate in other, high-type,bituminous surfacing in that area. A laboratory investigation preceded the field experiment, and the …

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

Building Services Engineering

No abstract provided.

Decomposition Of Diulte Hydrogen Peroxide In Alkaline Solutions, Harold M. Cota, T. Katan, M. Chin, F. J. Schoenweis

Civil and Environmental Engineering

No abstract provided.