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Theses/Dissertations

1962

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Full-Text Articles in Engineering

The Monopole Antenna With A Small Number Of Radials, S. H. Durrani Oct 1962

The Monopole Antenna With A Small Number Of Radials, S. H. Durrani

Electrical and Computer Engineering ETDs

This paper reports a study of an antenna system consisting of a vertical monopole and a small number of insulated horizontal radials lying lightly on the ground.

The monopole antenna has long been popular for medium frequency broadcasting because of its inherent simplicity and economy. Although quarter-wavelength resonant structures were used in the early days, it was shown by Ballantine (1924) that for a given power, the strongest field strength at the radio horizon was produced by an antenna about 0.6 wavelength long. This ignored the sky wave and was based on the assumption of a perfectly conducting (and ...


A Parametric Study Of The Heat Transfer Characteristics Of A Moving Band Heat Exchanger, Larry Hyde Brim Sep 1962

A Parametric Study Of The Heat Transfer Characteristics Of A Moving Band Heat Exchanger, Larry Hyde Brim

Theses and Dissertations

In recent years much attention has been devoted to the development of efficient heat exchangers. The regenerative or moving matrix heat exchanger is one type which has been considered. Most regenerative heat exchangers use one of the conventional types of high area matrices mounted in a drum or disk in such a manner that it can be moved in a continuous cycle from a cold fluid stream to a hot fluid stream and back again. A rather different approach to the design of a regenerative heat exchanger which has been patented in this country is a set of flexible moving ...


Hypersonic Plasma Thermionic Generator, Andre R. Leblanc Sep 1962

Hypersonic Plasma Thermionic Generator, Andre R. Leblanc

Electrical and Computer Engineering ETDs

The Langmuir two-probe system is extended to cover the case of electron emission from one of the probes. The contact potential difference between the two probes is also included as part of the equations. One of the probes, known as the emitter, operates at sufficiently high temperatures such that electron emission occurs, while the other probe, known as the collector, operates at low enough temperatures such that its electron emission can be neglected.


Linear Side-Loaded Transmission-Line Antennas, Robert W. Kulterman Aug 1962

Linear Side-Loaded Transmission-Line Antennas, Robert W. Kulterman

Electrical and Computer Engineering ETDs

A need has arisen in recent years for a mobile transmitting antenna capable of radiating large amounts of power as efficiently as possible in the frequency range from 10 to 40 kc. Several mechanical and electrical problems are encountered in building and operating such an antenna.


A Literature Review Covering The Effect Of Residual Stresses On Fatigue Strength Of Steel, Clarence A. Calder Aug 1962

A Literature Review Covering The Effect Of Residual Stresses On Fatigue Strength Of Steel, Clarence A. Calder

Theses and Dissertations

Fatigue fracture usually is defined as the failure of a part at a stress below its breaking stress due to repetitive loading conditions. It is now a well known fact that a part, designed for a maximum stress well below the yield point of the material, may be very apt to fail under cyclic loading conditions over a period of time. The metal appears to "wear out" after a time just like humans do and fatigue failure occurs. Metal fatigue may be contrasted to animal fatigue in that l) its detection before the latter stages is normally difficult if not ...


Stress Analysis Of An Infinite Cylinder With An Irregular Shaped Cavity Using Complex Variable Techniques, Gerald H. Lindsey Aug 1962

Stress Analysis Of An Infinite Cylinder With An Irregular Shaped Cavity Using Complex Variable Techniques, Gerald H. Lindsey

Theses and Dissertations

The advancement of modern technology has brought with It a demand upon the engineer for more thorough analysis techniques. This has been precipitated by the advent of missiles and space-craft that do not permit regular inspections to determine causes of failure, crack propagation, design weaknesses, etc. Thus, a more complete analytical work must be performed to facilitate a foreknowledge of reaction and performance of a particular design to its environment.


Unm Snail Programming Manual, Paul Edward Presson Jul 1962

Unm Snail Programming Manual, Paul Edward Presson

Electrical and Computer Engineering ETDs

The purpose of this thesis is to provide an introduction at the high school level to the principles of programming digital computers and to serve as a programming manual for the UNM SNAIL. The thesis is self-contained; that is, it may be read without reference material to provide a general background knowledge of computer programming.


Electromagnetic Radiation In Magneto-Ionic Media For Vlf And Vhf Spectra, Kenneth R. Cook Jul 1962

Electromagnetic Radiation In Magneto-Ionic Media For Vlf And Vhf Spectra, Kenneth R. Cook

Electrical and Computer Engineering ETDs

The interaction of electromagnetic fields and magneto-ionic media has received considerable attention in the last few years. In rather general terms, the investigation of these phenomena can be categorized into two basic classes. In one class of investigation the primary interest is the dynamic nature of the plasma when subjected to specialized forms of electromagnetic fields. This branch of science has various nomenclatures such as hydromagnetics, magnetohydrodynamics, plasma physics and numerous others implying the use of high density ionized gases interacting with electromagnetic fields. Controlled fusion processes for transforming energy states is an example of this branch of electromagnetics and ...


A Multistory Structure Concept, Wybe J. Van Der Meer Jun 1962

A Multistory Structure Concept, Wybe J. Van Der Meer

Civil Engineering ETDs

It is the objective of this thesis to investigate the feasibility of a multistoried structural concept in which the principal structural elements are hollow girders and chambered hollow columns. The scope will be directed towards the general conceptions, assumptions and design procedures for the system. Only such specific design of a particular example will be accomplished as is necessary to provide correlation and justification for the general assumptions. A detailed investigation and design is not intended since this thesis is oriented towards establishing a general concept not merely a particular example.


Experimental Investigation Of The Interaction Of An Oblique Shock Wave With A Turbulent Boundary Layer, Amado Arthur Trujillo Jun 1962

Experimental Investigation Of The Interaction Of An Oblique Shock Wave With A Turbulent Boundary Layer, Amado Arthur Trujillo

Mechanical Engineering ETDs

The purpose of the investigation was to accurately describe the interaction of a shock wave and a turbulent boundary layer based upon the measurement and subsequent analysis of both static and impact pressure throughout the interaction region.


Some Design Criteria For Open-Ended Microwave Cavities, Richard O. Gilmer Jun 1962

Some Design Criteria For Open-Ended Microwave Cavities, Richard O. Gilmer

Electrical and Computer Engineering ETDs

Primarily this paper describes the electromagnetic problems involved in determining a proper waveguide size for the TE11N cavity and its terminations. Also, one chapter is devoted to construction techniques used in the construction of open-ended sampling cavities. The approach one may use for aerodynamic improvements of the cavities is discussed, but no conclusions can be drawn about the design's validity since no experimental tests were taken.

This paper will describe the design, construction, and testing of a microwave cavity, the end plates which are replaced by terminations which allow up to 93% of the cross-sectional area of the ...


A Study Of Temperature Measurement Precision In Debye-Scherrer Specimens During High Temperature X-Ray Diffraction Measurement Of Thermal Expansion, Roy Glenn Merryman Jun 1962

A Study Of Temperature Measurement Precision In Debye-Scherrer Specimens During High Temperature X-Ray Diffraction Measurement Of Thermal Expansion, Roy Glenn Merryman

Mechanical Engineering ETDs

The literature cited covers a comprehensive survey on temperature measurement methods in thermal expansion determination utilizing X-ray diffraction from 1921 through 1961 and a compilation of all published data on the thermal expansion of gold from 1916 through 1960 and magnesium oxide from 1906 through 1961. References for comparison of the MgO results with those of the Bureau of Mines Interlaboratory Program of Thermal Expansion Measurements on MgO are also presented. The literature on temperature measurement was limited to those articles featuring camera design or temperature conditions, since to examine publications on all phases of thermal expansion was found to ...


Determination Of Thermal Stresses At Interior Points, Siegfried Thunborg Jr. Jun 1962

Determination Of Thermal Stresses At Interior Points, Siegfried Thunborg Jr.

Mechanical Engineering ETDs

Existing theory was used to determine the thermal stresses and strains throughout a long thick walled cylinder under equilibrium thermal conditions when the thermal gra­dient through the wall is dependent on radial position only.

A thick walled cylindrical model, made of a plastic material, was constructed and strain gages were imbedded in and mounted on the cylinder to determine strains at interior and surface locations. The cylinder was subjected to equi­librium and transient thermal conditions and thermal strains were measured. In the equilibrium thermal condition the measured strains were compared with those predicted by theory.

The results show ...


An Automatic Standard Cell Comparator, D. W. Braudaway Jun 1962

An Automatic Standard Cell Comparator, D. W. Braudaway

Electrical and Computer Engineering ETDs

No abstract provided.


The Effects Of Selected Factors On Design Sensitivity, Leslie Horshal Cochran Jun 1962

The Effects Of Selected Factors On Design Sensitivity, Leslie Horshal Cochran

Master's Theses

Chapter I.

Background of the Study

Introduction

Design is a comprehensive term involving a multitude of areas and activities. Its meaning has varied according to individual tastes and philosophies; however, regardless of the terminology involved, it has always been associated with the planning for an object or a product.

Throughout history the emphasis on design has varied, but its basic framework has been present in all cultures. From the crude but honest designs of primitive man, through the Golden Age of Greece, by means of the Roman Empire, via the Renaissance, and throughout the Eighteenth and Nineteenth Centuries, design served ...


The Sand Equivalent As An Acceptance And Control Test For Asphaltic Concrete In New Mexico, Delmar E. Calhoun Jun 1962

The Sand Equivalent As An Acceptance And Control Test For Asphaltic Concrete In New Mexico, Delmar E. Calhoun

Civil Engineering ETDs

The research reported in this thesis was sponsored by the New Mexico State Highway Department and was directed at evaluating the efficacy of the sand equivalent test when used on New Mexico aggregates used for asphaltic concrete pavements.


Sediment Transport Parameters, Rio Puerco Near Bernardo, New Mexico., Carl F. Nordin Jr. Jun 1962

Sediment Transport Parameters, Rio Puerco Near Bernardo, New Mexico., Carl F. Nordin Jr.

Civil Engineering ETDs

Preliminary findings of a study of sediment transport in streams with high concentrations of suspended fine sediment indicate that for Rio Puerco near Bernardo, New Mexico the velocity varies logarithmically with depth, and the concentration distribution for several size classes of sand may be described by a conventional distribution equation if the fall velocity of the sand is corrected for the influence of the fine sediment. A corrected fall velocity, empirically defined for a temperature of 24°C and for concentrations up to about 150,000 ppm, is given.

The purpose of this study was to investigate some aspects of ...


Counter Circuits Using Gaseous Discharge Tubes And Rectifiers, Robert Creveling May 1962

Counter Circuits Using Gaseous Discharge Tubes And Rectifiers, Robert Creveling

Electrical and Computer Engineering ETDs

This thesis pertains to an electric circuit consisting of gaseous discharge tubes and rectifiers arranged to comprise a counting or integrating device for electric impulses impressed on the system. The ideas presented herewith are wholly those of the author and were submitted in the form of a patent application via the New Mexico School of Mines in June 1950. The basic idea for such a circuit was conceived on November 14, 1949.


Packed Bed Heat Transfer, Anthony William Sposaro May 1962

Packed Bed Heat Transfer, Anthony William Sposaro

Theses

The use of various published correlations to determine apparent thermal conductivities was found to give results of differing ma; magnitudes. For this reason when these values were utilized in the theoretical relationships proposed by McAdams:

tw-t2/tw-t1 = 0.692e-23.14X + 0.1312e-121.9X + 0.0535e-299.6X

in which X is defined as

X = (KaL/CpGoD2t)

For packed bed systems the results were found to be inconsistent.

In this investigation a dimensionless equation:

Ka/kg = 0.00105 (DpGo/ϵpμ)1.32

has been developed which permits the prediction of apparent thermal conductivities to air flowing through ...


Conduction Phenomena Of Reduced Titanium Dioxide With An Oxide Surface Layer, Richard Bechtel May 1962

Conduction Phenomena Of Reduced Titanium Dioxide With An Oxide Surface Layer, Richard Bechtel

Electrical and Computer Engineering ETDs

No abstract provided.


Jurisdictional Disputes Within The Construction Industry, Dominick Joseph Magarelli May 1962

Jurisdictional Disputes Within The Construction Industry, Dominick Joseph Magarelli

Theses

Work assignment disputes, known as jurisdictional disputes are common in the construction industry. They are not only costly but annoying as well, The construction industry has always been plagued with this type of dispute because each of its many craft unions regards certain types of work as a proprietary right. They jealously guard against any encroachment of their area of activity by other unions. Sometimes lines of demarcation between the various jurisdictions are not clear. Also, the development of new products and methods often brings with it clashes between unions each of whom claim exclusive right to the work assignment ...


The Corrosion Of Zinc-Stainless Steel Couples In Flowing Sea Water, Henry Shaw May 1962

The Corrosion Of Zinc-Stainless Steel Couples In Flowing Sea Water, Henry Shaw

Theses

The effect of sea water flow on passivated stainless steel 304 coupled to high purity zinc was studied for more than 1000 hours at 23°C. The corrosion of both members of the couple increased over that of the metals alone. Zinc suffered severe pitting while the Stainless Steel was not visibly corroded, When the metals were exposed alone, zinc corroded uniformly while the stainless steel was not affected at all. The use of zinc coupled to Stainless Steel is not recommended in systems exposed to sea water.


The Effect Of Liquid Surface Tension On Wire Mesh Entrainment Separators, Herbert Franklyn Schroeder May 1962

The Effect Of Liquid Surface Tension On Wire Mesh Entrainment Separators, Herbert Franklyn Schroeder

Theses

The effect of liquid surface tension on the capacity of a wire mesh entrainment separator was studied. An air-rater system was used and, the surface tension of the water was reduced through the use of surfactants.

Five test series were run, each with a different surface tension of water. The surface tensions examined covered the range of 30 dynes/cm to 70 dynes/cm. For each test run series, the effect of liquid loading was investigated. Liquid loading rates were varied between 55 and 550 lbs/hr/ft².

Entrainment separator capacity was found to vary linearly with liquid surface tension ...


Compressive And Flexural Strength Of Portland Cement Concrete As Affected By Fractured Particles Of Coarse Aggregate, Russell L. Vesper May 1962

Compressive And Flexural Strength Of Portland Cement Concrete As Affected By Fractured Particles Of Coarse Aggregate, Russell L. Vesper

Civil Engineering ETDs

Although a great deal of experimental data are available on many of the factors involved in a concrete mix design, a limited amount of work has been done to determine the effect of the surface characteristics of the concrete aggregates. Some research has been done in this connection by the New Mexico Highway Department. Some of the results of this research are included in a later section of this thesis.


Linear Time Base Precision And The Compound Sweep Concept, William W. Steger May 1962

Linear Time Base Precision And The Compound Sweep Concept, William W. Steger

Electrical and Computer Engineering ETDs

This paper is a monograph on general precision criteria for feedback linear time base circuits. The linearity and stability performance of these devices is evaluated in terms of deviation from an ideal ramp function.

In its entirety, the paper attempts to provide a complete reference for the most commonly encountered aspects of time base precision. Attention is centered on what could be called the "low frequency" case, which most often is valid in applications requiring a high precision time base.

The subject is developed in a number of progressive, cumulative stages. The end products at each stage of the analysis ...


Radial Dislocations In Plane Stress., William J. Sieger May 1962

Radial Dislocations In Plane Stress., William J. Sieger

Mechanical Engineering ETDs

The elastic dislocation theory was used to obtain stress potentials for the dual dislocation problem. These solutions give the stress field for an infinite plane region containing a centrally located circular hole with two radial dislocations originating from opposite sides of the hole and extending into the region along a line perpendicular to the axis of applied load. Solutions were obtained for both the case of a linear dislocation relation along the cuts and for a parabolic relation.


A Prototype Transmitter For A Microwave Refractometer, John C. Jordan May 1962

A Prototype Transmitter For A Microwave Refractometer, John C. Jordan

Electrical and Computer Engineering ETDs

A study of the design, development and fabrication details of a transmitter for a microwave refractometer is presented. Atmospheric, radio frequency, refractive index is to be measured rapidly and directly up to altitudes of the order of 200,000 feet. Requirements for the transmitter with regard to its weight, volume and environment are indeed stringent since it is proposed to package the transmitter in a ogive configuration and elevate it to these altitudes utilizing a rocket propulsion system.


Complementary Transistor Memory Circuit And Logic Applications, Lee M. Bossart May 1962

Complementary Transistor Memory Circuit And Logic Applications, Lee M. Bossart

Electrical and Computer Engineering ETDs

No abstract provided.


The Aerodynamic Drag Of Spheres, Leon Rouzelle Scott May 1962

The Aerodynamic Drag Of Spheres, Leon Rouzelle Scott

Theses and Dissertations

A literature survey was conducted to determine the factors which affect aerodynamic drag of spheres. Graphs are presented which show the effect of each variable where such information was available. Equipment was designed and built for the purpose of studying the effects of acceleration on the aerodynamic drag of spheres. Special emphasis was placed on the measurement and control of each of the other variables which can affect the drag. Tests were conducted using large spheres in air and water to show that the method presented can produce a valid determination of the drag coefficients. The numerical values of the ...


A Study Of Sprinkler Uniformity Evaluation Methods, Baha Dabbous May 1962

A Study Of Sprinkler Uniformity Evaluation Methods, Baha Dabbous

All Graduate Theses and Dissertations

The use of water in homes, on farms, by factories, and for recreational purposes has been increasing rapidly. Water use has doubled in the last three decades. By 1980, water use is expected to be double the current use. In arid and semi-arid regions, the practice of successful profit-yielding agriculture often depends on irrigation. Irrigation is, in turn, dependent upon a water supply which is limited. The highest pos sible efficiency should be maintained if maximum utilization of the available water resources for irrigation is desired. Sprinkler irrigation allows, among other things, high water application efficiencies with good distribution uniformities.