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The Magnitude And Directions Of Strains And Stresses In Edge Loaded Concrete Slabs, William M. Baldwin

Masters Theses

"The concrete industry in the United States represents one of the fastest growing segments of the national economy. Many reasons for this may be given, among which are, the durability of concrete structures, the local availability of a large portion of the materials used in concrete, and its wide range of adaptability to the designs of engineers and architects.

One of the most recent changes in concrete usage is the change from reinforced concrete to prestressed concrete. The term prestressed as used herein refers to any type of reinforced concrete in which the reinforcing material has a stress prior to …

Physical Properties Of Concrete At Early Ages, Karl H. Dunn

Masters Theses

"There are well over 100,000 miles of concrete pavements existing today on our United States highway system. The development of these pavements during the first half of this century has been a process of learning from construction applications and mistakes. However, the unexpected increase in traffic load has brought highway designers to experiment with relatively new types and designs of concrete pavement construction.

Some designers, in an effort to reduce temperature warping stresses, have used short slabs 10 to 15 feet in length, generally unreinforced. Another type of construction is the definitely jointed slabs, the slabs being from 20 to …

A Determination Of The Sonic Modulus Of Early Age Concrete, William Dale Nelson

Masters Theses

"The problem which the writer is analyzing in this thesis was suggested by Professor E. W. Carlton of the Civil Engineering Department. It is a determination, by use of sonic testing equipment, of the growth in the sonic modulus of early age concrete.

Since 1938 when T. C. Powers published his paper, "Measuring Young's Modulus of Elasticity by Means of Sonic Vibrations", in the proceedings of the American Society of Testing Materials, Vol. 38, Part II, a great deal of work has been done on the applications of sonic testing of concrete. It began a new era in concrete testing, …

A Comparative Determination Of Weld Shearing Values In Welded Wire Reinforcement Fabric, Ernest Charles Kobs

Masters Theses

"At the suggestion of Professor E. W. Carlton, Chairman, Civil Engineering Department, Missouri School of Mines and Metallurgy, the author selected as subject for research thesis, “A Comparative Determination of Weld Shear Values in Welded Wire Reinforcement Fabric”.

In 1948, the Wire Reinforcement Institute initiated a research program to measure the actual stresses, including weld shear stresses, that occur in Welded Wire Fabric when used as reinforcement in a concrete slab. A great majority of this research was under the supervision of Professor Carlton.

The results of these investigations indicated a wide variation in strength of welds. As a means …

An Experimental And Theoretical Investigation Of The Preferred Orientation In Deformed And Recrystallized Hafnium, David S. Gould

Doctoral Dissertations

"The research problem, as presented, therefore became two-fold; first to investigate and determine the feasibility of fabrication of hafnium and secondly to study the deformation characteristics of the material in light of the overall study of hexagonal metals aimed at the development of an overall general theory of plastic deformation. This appeared to envolve a study of the operating deformation systems in hafnium and the theoretical and experimental study of the textures resulting from plastic deformation. These were to be analyzed in comparison with the other hexagonal metals.

It became evident immediately that the research techniques which must be evolved …

A Thermodynamic Study Of The Titanium Sulfides, Reinhard Paul Abendroth

Doctoral Dissertations

"The determination of the thermodynamic properties of chemical compounds is in essence an experimental one. The purpose of this investigation was (1) to make an experimental determination of the thermodynamic properties of the titanium sulfides (2) to determine what sulfide phases are present in the titanium-sulfur system (3) to show the relationships between the various phases present"--The Problem, Statement of the Problem, page 3.

Investigation Of Plastic Deformation In Prestressed Concrete Slabs From Long Time Loading, Joe B. Roberts

Masters Theses

"It is the purpose of this research to investigate the creep in a thin concrete slab under a long-time prestress load with the compressive load being applied to the edge of the slab through a bearing plate of small dimensions.

Seven plain concrete slabs, 3' x 4' x 4", approximately one year old, made of normal cement and approved aggregate were subjected to the following loading conditions: (1) Three slabs loaded at the center of the greater dimension with a prestress load or 20,000 pounds applied over an area of eight square inches, (2) Three slabs loaded symmetrically at six …

Transistors Applied To An Fm-Fm Airborne Radio Telemetery System, R. H. Gablehouse

Electrical and Computer Engineering ETDs

The two semiconductor elements commonly used in transistor production, silicon and germanium, were discovered by two European chemists. A Swedish chemist, Jons Jakob Berzelius, separated and identified silicon in 1823. Germanium was discovered and named by a German chemist, Clemens Alexander Winkler in 1886.

A Technique For Obtaining Submicrosecond Exposure Times At Large Aperture In High-Speed Photography, Joseph A. Hull

Electrical and Computer Engineering ETDs

The purpose of the investigation described in this report was to attempt to improve one of the existing techniques, namely, the Kerr cell type electrooptical shutter, to make it more applicable to the study of high-explosive physics. To provide a background for the reader, a brief discussion of the other techniques will be described. Some of the advantages and limitations of these systems will be discussed.

The Variations Of Stress Induced In An Eccentrically Located Bolt Securing A Flanged Joint, Verne E. Blake Jr.

Mechanical Engineering ETDs

It is common practice in design work to use bolts as a means of attaching load carrying members. In many instances it is not possible to locate the bolt so the line of action of the external load will pass through the bolt axis. As a result, there are secondary loads, resulting from the eccentricity of the load paths, which the bolt must resist in addition to the primary loads.

Determination Of The Residual Vswr [Voltage Standing Wave Ratio] Of A Slotted Line., Michael C. Robel

Electrical and Computer Engineering ETDs

Idealistically, a slotted line should be designed so that, when it is terminated in its characteristic impedance, the VSWR as determined by a movable probe in the slotted line will be 1.0. However, in practice this is not possible, particularly in the case of coaxial slotted lines where matching elements, adapters and connectors are utilized. The devices mentioned above have physical discontinuities which give rise to reflections, which cause a standing wave to be produced even though the line is terminated I its characteristic impedance.

High Stability Lc Oscillator For Use With A Capacitive Pressure Sensing Element, Arthur J. Eldridge

Electrical and Computer Engineering ETDs

In the course of work at the Sandia Corporation, a definite need arose for the measurement of barometric pressures to an accuracy beyond that attainable with commercially available equipment. The standard instrument for measuring these pressures is the mercurial barometer. While a visual method of reading the instrument produced good results to within a 0.1 millimeter of mercury, it was dependent upon the operator using as a reference a target of sighting on the top of the meniscus formed in the barometer tube by the mercury.

Corona Threshold Of Single And Multiple Conductor Lines, David S. Carrick

Electrical and Computer Engineering ETDs

Corona is a self sustaining, often luminous discharge due to ionization adjacent to charged conductors, characterized by the electrodes having a small radius of curvature compared with the interelectrode gap. The display on a power transmission line is accompanied by a current between the conductors which to an engineer mean a power loss that should be minimized if unavoidable.

Calcination Of Missouri Flint, Burley And Diaspore Clays In A Rotary Kiln, Richard Addison Parker

Professional Degree Theses

"This thesis will concern itself primarily with the preparation, handling and calcination of Missouri fire clays that are subsequently used as "grog" for manufacture of fire brick. This "grog", i.e., calcined flint, burley or diaspore clay is then mixed with ether clays having plastic qualities to form desired shapes of high temperature refractories, and burned as a final product in tunnel kilns and as required, in “beehive” or periodic kilns. The actual manufacture of fire brick will not be dealt with since it is, in itself, a highly specialized industry. We are immediately concerned with the proper preparation of calcined …

Design And Development Of Cantilevered Flexural Pivots For Use In Self-Leveling Surveying Instruments, Rolland Lee Hardy

Professional Degree Theses

"Problem: The problem to be covered in this dissertation is broadly stated in its title, namely, the design and development of cantilevered flexural pivots for use in self-leveling surveying instruments. For clarification, the definitions of the significant phrases in the title which may be completely new or unknown to the reader are covered in this introduction. Because the dissertation actually covers a series of problems, each will be defined more specifically as they are covered in the discussion"--Introduction, page 1.

The Effect Of Today's Residential Electric Consumer On The Planning, Design, And Operation Of Electrical Distribution Systems, James Wilbur Stephens

Professional Degree Theses

"The purpose of this paper shall be primarily to show the present day trends in the use of electricity by the residential consumer and the effect of such trends on the design, planning, and operation of the electric distribution system. System planning related to the electric utility is divided into two classes. The first deals with generation. The second deals with distribution from the various load and transmission centers to the customer. This thesis will deal .primarily with studies related to the latter.

Many utility distribution system problems have been brought about by the rapidly increased demands for residential uses …

A Study Of Gas Porosity In Aluminum Casting Alloys Using Radioactive Hydrogen As A Tracer, Osborne Milton

Professional Degree Theses

"A method will be described wherein the absorption of hydrogen by aluminum is evaluated using hydrogen 3 as a tracer element. Results show that hydrogen gas is readily absorbed into the melt when it is injected directly, but is not taken on from the combustion products, that quantities of it are released when the metal freezes, and that the commonly used methods of fluxing with chlorine and nitrogen gas are of value for degassing"--Preface, page iii.

Subsurface Geology Of The Mississippi Embayment Of Southeast Missouri, John Gustave Grohskopf

Professional Degree Theses

"To the southeast of the Ozark Escarpment all municipal, industrial, and agricultural water supplies of record are obtained by drilled wells from alluvial sands and gravels, unconsolidated sands of the Wilcox and McNairy (Ripley) formations, and at a few towns from consolidated Paleozoic dolomites limestones, and sandstones. The irrigation wells obtain their water supply from the Allluvium. These wells have recorded yields of several thousand g.p.m, and the water, though excessively high in iron, is still satisfactory for the irrigation of crops. Some municipal and industrial supplies are obtained from the Wilcox sands, but the water usually requires iron-removal treatment. …

Light Gage Steel Connections With High-Strength, High-Torqued Bolts, George Winter

CCFSS Library (1939 - present)

The usual methods for designing bolted connections of conventional steel structures must be modified for application to thin-walled, light-gage steel construction. This is so because the ratios of bolt diameter to steel thickness in light-gage construction are generally much larger than those customary in conventional construction. In a previous paper [1] the writer has published the results of 547 tests of light-gage steel connections with ordinary "black" bolts. The results could be expressed in four simple equations for determining failure loads which, when used with an appropriate factor of safety, can serve as a safe basis for design. It is …

The Response Of Vibration Mounts Subjected To Biharmonic Vibration, Paul H. Adams

Mechanical Engineering ETDs

Existing specifications used in vibration testing are based on envelopes of many points of fixed frequency and vibration amplitude measured at specific points in aircraft. In addition these specifications are to some extent written to be compatible with the two common types of vibration test machines, the reaction or constant-displacement type and the electromagnetic or constant-acceleration type. Thus the "envelope" of the measured vibration amplitudes is drawn in such a manner as to have a constant displacement from 3 to 60 cycles per second, the range of the reaction type of vibration test machine, and a constant acceleration from 60 …

Annual Report Of The Assistant Director, 1955-1956, Harold L. Michael

JTRP Technical Reports

No abstract provided.

A Study Of The Deleading Of Zinc Sulfide Concentrates, Larry Leroy Gidley

Masters Theses

"The object of this research was to study the basic principles and optimum conditions for the deleading of commercial zinc sulfide concentrates by sublimation of the lead in the form of a sulfide. Present commercial practice conducts this sublimation in hearth roasters. This research considered only the variables affecting sublimation of the lead sulfide, not the types of applicable equipment, or other possible processes. However, the laboratory conditions were at least partially similar to those that could be obtained in commercial practice"--Object, page 1.

Development Of Large Hole Burn Cut Drift Rounds, Joseph J. Yancik Jr.

Masters Theses

"A decided change in the attitudes of mining management toward the need for mine research has taken place during the past decade. More emphasis is being placed not only on the improvement of existing mining methods, but also on the adaptation of new ideas. As the depletion of the high grade ore deposits in this country becomes a reality, the need for reducing the costs of mining is pressing. The successful exploitation of low grade ore bodies will depend upon the continued advancement in the science of mining.

The methods used today in driving a small drift or tunnel in …

Heat Transfer Coefficient Of Paint Films, Richard F. Justus

Masters Theses

"Many studies of heat transmission have been carried out on various kinds of surfaces. But relatively few investigators have studied the loss of heat from a painted surface. Any surface will lose or gain heat by one or more of the three mechanisms of heat transmission: conduction, convection, and radiation. These mechanisms are thoroughly discussed by McAdams.

Heat transmission can be analyzed by determining thermal conductivity for conduction, overall coefficient for convection, and emissivity for radiation. The resistance concept is useful in indicating the various components of the overall coefficients and in analyzing problems in thermal conduction.

In studying heat …

A Study Of The Production Of Thorium Nitrate, K. P. Chona Panikkar

Masters Theses

"The purpose of this investigation was to study the various methods of producing Thorium Nitrate from monozite sand. This investigation includes a study of the Chemistry of Thorium and estimation of the Thorium Oxide content of monozite sand obtained from North Carolina"--Introduction, page 1.

Investigation Of The Current Distribution On An Antenna In A Waveguide, David J. Freeman

Masters Theses

"In a communication system composed of several networks and transmission systems, it is necessary for all parts of the system to be impedance matched so that medium energy transfer is possible.

One of the recent transmission systems which has been developed is the wave guide. With the advent of the wave guide the communication engineer is immediately faced with the problem of coupling existing systems and networks to his newly found mode of transmission.

Practically this coupling problem reduces to one of feeding radio frequency energy to the wave guide with some conventional transmission line such as a coaxial line. …

Promotion Of Dropwise Condensation By Silicones, Charles Orlando Reed Jr.

Masters Theses

"Within this rather extensive field of study, transfer of heat through fluid films and heat transfer during the condensation process have been the subject of considerable thought and investigation both from a theoretical standpoint and with the aim of collecting data on specific systems to aid the design and construction of equipment in which heat transfer is involved….

The phenomenum of dropwise condensation has not become a common one in industrial practive for a number of reasons, namely, the difficulty in maintaining the activity of the promoter without frequent makeup because of impermanent attachment and volatility, the difficulty in finding …

Physical Properties Of Concrete At Early Ages, Peter G. Hansen

Masters Theses

"One of the principal types of heavy duty pavements in use in Missouri and in many other states is that known as rigid type portland cement concrete.

There have been two major trends in this type of pavement design. One of these trends is the use of short slabs, i.e., 15 to 25 feet, with no reinforcement. Another trend consists of concrete slabs containing distributed reinforcement such as wire mesh or reinforcing bars with joints occurring at fairly large intervals of 50 to 100 feet. As loads on the highways have increased the designers have increased the slab thicknesses and …

Phase Relationships In The Quaternary System Lime-Titania-Zirconia-Silica, Robert Martin Gruver

Doctoral Dissertations

"The phase compatibility relationships for the quaternary system lime-titania-zirconia-silica have been determined by a solid-phase-reaction technique.

Preliminary division of the system into Alkemade tetrahedra was based on the phases found in samples by X-ray diffraction analysis. These samples covered the entire volume of the tetrahedron in a systematic fashion. When the quaternary system had been divided into regions or compatible phases, an analytical method was used to calculate the phase composition of each sample. The relative amounts of each phase in a sample determined by X-ray analysis were compared with the calculated quantities, and agreement between the two methods verified …

Determination Of The Effect Of Air-Entraining Agents On Certain Physical Properties Of Concrete At Early Ages, James Arthur Spilman

Masters Theses

"Air entrained concrete over the past eighteen years has received national recognition as a result of its satisfactory performance in highway concrete pavements and other concrete structures subjected to outside exposure.

Numerous highway departments over the entire United States have laid test slabs made of air entrained concrete. Among those to date are Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Vermont, Maine, Illinois, Missouri and California. The primary purpose in building these test slabs was to investigate their durability or resistance to freezing and thawing and the action of various salts on air entrained concrete. The results of the test …