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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

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

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 terminations …

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.

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 that imbedded …

An Automatic Standard Cell Comparator, D. W. Braudaway

Electrical and Computer Engineering ETDs

No abstract provided.

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 the sediment …

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.

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

Electrical and Computer Engineering ETDs

No abstract provided.

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.

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 …

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.

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

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

Electrical and Computer Engineering ETDs

No abstract provided.

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 …

An Approach To Azimuth Angle Refraction Corrections, Wallis R. Cramond

Electrical and Computer Engineering ETDs

In the past, analyses of tropospheric reactions of electromagnetic waves propagating in the atmosphere have been based on spherically symmetric medium. However, this applies only to ray bending in a vertical plane (elevation angles). Numerous methods have been developed to correct for elevation angle errors. In 1961, the presentation of a new method for use in a nonsymmetric atmosphere revived interest in horizontal (azimuth angle) bending. In order to use this method to test significance of azimuth angle errors, the spacial distribution of index of refraction must be known.

The primary objective of this paper is to propose a model …

A Theory Of Self-Evaluating Discrete Communication Systems, Samuel D. Sterns

Electrical and Computer Engineering ETDs

No abstract provided.

Radar Back-Scatter Theories For Near-Vertical Incidence And Their Application To An Estimate Of The Lunar Surface Roughness, Harbhajan S. Hayre

Electrical and Computer Engineering ETDs

This work, after the critical examination of the theoretical background on back-scattering from rough surfaces, offers a new approach to its theory. Various back-scatter theories, as well as the statistical models of terrain and moon assumed therein, are critically reviewed and correlated. A new approach which uses a simple statistical model is then presented for the description of scattering of electromagnetic waves from a rough surface. The statistics of a rough surface are discussed in terms of certain parameters which can be easily associated the surface features, and a new expression for the back-scattering radar cross section per unit area …

Plastic Models For The Study Of Thermal Stresses, Carl W. Theisen

Mechanical Engineering ETDs

The purpose of this thesis was to determine and evaluate an experimental method for accurately measuring thermal stresses in structural shapes subjected to large transient thermal gradients, without introducing the problems of high temperature instrumentation, or expensive and elaborate test facilities. Most experimental methods consist of mounting high temperature strain gages on the prototype or model of the metal structure to be evaluated, thermal shocking the structure and then recording the accompanying strains. This method is used quite extensively in the aircraft field, and in others, where the effects of thermal stresses must be considered. However, problems are encountered when …

A System For Recording Electromagnetic Atmospheric Noise In 30-50 Cps Region, James F. White

Electrical and Computer Engineering ETDs

The electromagnetic noise spectrum extends from below 1 cps to above 3,000 mcs. Within this spectrum many phenomena of atmospheric noise have been observed. Those atmospherics which occur in the audio frequency region of the spectrum have been given not only descriptive but also subjective names by many different investigators. As a result, it is often difficult to determine from the literature what aspect of the noise phenomenon is being considered. In addition, references to low frequencies involved in certain experiments are vague. A brief history of atmospherics research is presented here in order to explain the terminology, to show …

A Study Of Gamma-Ray Photoconductivity In Organic Dielectric Materials, Stanley E. Harrison

Electrical and Computer Engineering ETDs

The gamma-ray photoconductivities of polyethylene, polystyrene, polyvinylchloride, polypropylene, Teflon, Nylon, Kel-F, and three thermosetting resins denoted as Epoxy 1478-1, 1478-3, and 1478-22 have been measured. The measurements were made at steady-state gamma-ray intensities ranging from 1.0rad(H₂O)/min to 3.0 x 10⁵ rads(H₂o)/min and at controlled temperatures ranging from 90 degrees Fahrenheit to 140 degrees Fahrenheit. Conductivity changes resulting from the steady-state gamma-ray exposures were measured continuously throughout the exposure and after the exposure. The exposure period was of sufficient duration to allow all samples to achieve an equilibrium conductivity value.

The Development Of A Static Pressure Probe For The Interaction Region Of Shock Waves And Boundary Layers, John Rode

Mechanical Engineering ETDs

The purpose of this investigation was to develop a static pressure probe for measuring static pressures in the region of interaction of a shock wave and a boundary layer. Requirements of such a probe are: small size to permit measurement of pressure variations within the thin boundary layer, pressure coefficient close to unity to permit precise static pressure measurements in regions of unknown and varying velocity and proper response to large pressure gradients.

Control System Digital Computer Transfer Function Simulation, Jens J. Jonson

Faculty Publications

The z transform of simple delay, integrator, leadlag, and differentiator networks are suggested as the basic building blocks for simulating complex control systems on a digital computer. The system parameters retain their explicit identity, thus facilitating analysis and design of the system as a function of specific parameter changes.

An Evaluation Of Concrete Making Properties Of Scoria Lightweight Aggregate Based On Compressive Strength, Khurshid Ahmad Chaudhry

Civil Engineering ETDs

Compressive strength of scoria-aggregate concrete was examined by introducing controlled variables into the mix proportions. A mix design method for accurate mix design was formulated and was analyzed for consistency and feasibility.

A Qualitative Study On An Exploding Wire Fuse, W.D. Lacoss

Electrical and Computer Engineering ETDs

This study was undertaken in an effort to develop basic concepts of normal operating fuse criteria that will apply to capacitor energy storage systems. To develop ideas germane to normal fuse operating limits, it was necessary to consider certain principles that preceded this development: (1) A review had to be made of some of the experimental work on the exploding wire phenomenon to indicate a possible application as a fuse; (2) A typical circuit requiring such a fuse had to be described schematically and analyzed to show the dependency between the circuit parameters and the necessary conditions for obtaining fusing …

Specification For The Design Of Light Gage Cold-Formed Steel Structural Members, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Predicted Transient Response Of Complex Poles By Means Of A Residue Ratio, Rameshchandra Shankerbhai Patel

Masters Theses

"Transient response plays an important role in servomechanism, electronic and electrical circuits. A time response of a linear system is the intuitive and immediately comprehensible description of the system performance. The utility of the system performance in television and high speed computer circuits can be determined by its transient characteristics. By locating certain points on the transient response curve the designer is enabled to predict the shape of the response with some precision. The choice of the overall transfer function (or location of the system singularities on the s-plane plot) is decided by speed, accuracy and stability of the response …

A Survey Of The Methods Of Gas Analysis, Yadvendra V. Desai

Masters Theses

"The object of this thesis is to survey the different types of gas analyses. Subject concentration will be centered on the general and specific instrumental methods of gas analysis. A general account of continuous automatic gas analyzers will be included. References are included for the use of those who desire a more comprehensive knowledge of a specific method of gas analysis.

During recent years, the importance of gas analysis has been considerably increased with the advancement of science and technology. Gas analysis mainly involves the identification, quantitative evaluation and separation of the components of a gaseous mixture. Thus it includes …

A Model Study Of The Application Of Roof Bolts Under Unsymmetrical Loading Conditions, Friedrich H. K. Esser

Masters Theses

"When coal is extracted by the long wall mining method, two gate-roads on either side of the working face are driven with the advancing operation. In the surroundings of these openings the state of stress which existed prior to mining is not only disturbed by the drifting process of the gate-roads but also by the coal extraction in the long wall, resulting in an "unsymmetrical" stress distribution. Varying incremental pressure components and the high complexity of strata movements make it extremely difficult to control the rock behavior under unsymmetrical conditions by conventional support. Application of roof bolts as an auxiliary …