Engineering Commons^™

Investigation Of The Stability And Response Of A Reboiler Under Condensate Control, Francis Arthur Winter

Theses

Control of heat flux by condensate throttling was investigated theoretically by frequency response analysis and experimentally on a simulated reboiler control system.

Transfer functions were derived for each component and ware used to describe the response of the experi- mental system. Experimental controller settings were in reasonable agreement with the calculated results. However, general overall control was poor because of dead time and cyclic disturbances. Experiments showed that the process contained dead time in the order of three to seven times the ultimate period (0.5 - 1.0 minutes). Several sources of disturbances prevented an accurate evaluation of stability at low …

Physical And Electrical Properties Of The Manganin-Type Alloys, Wallace William Macintosh

Theses

This thesis is a report on the physical and electrical properties of the manganin-type alloys as compiled from the published literature on the subject. The peculiarities of these alloys, as related to mechanical history, heat treatment, and composition, are discussed. Empirical formulae, by which the temperature coefficient of resistance, the temperature of maximum resistance, the temperature-resistance equation, and the thermoelectric emf of these alloys against copper may be calculated, are shown.

A comparison of the effect of elongation on the specific resistivity of several sizes of manganin wire is made on the basis of experimental results. The effect of impurities …

The Electrolytic Preparation Of Perbromates, Robert M. Casciano

Theses

Since perchlorates and periodates can be formed by the electrolytic oxidation of chlorate and iodate solutions and since bromine lies between chlorine and iodine in the periodic table, it should be possible to electrolytically prepare perbromates. As yet, however, perbromates have not been prepared by any methods.

It was desired to attempt to prepare perbromates electrolytically and to definitely show their presence or absence after electrolysis. In order to accomplish this a new method of analysis was developed.

This work has shown that perbromates cannot be prepared by the electrolytic oxidation of bromate solutions under various conditions of temperature, current …

Effect Of Elevated Temperature On Efficiency Of Corrosion Inhibitors, Walter Dzingala

Theses

An experimental program was set up to investigate the effect of temperature on the protection efficiency of various inhibitors of metal corrosion. Contrary to most studies, an appreciable amount of the work was done with the corrosive effect being determined on the metal specimens that were exposed first to the inhibitor, then to air at different temperature, and finally to the corrosive medium with no inhibitor present. The purpose being to determine whether the inhibitor treatment would provide a permanent protection for a metal surface or would it be necessary to furnish a continuous supply of the inhibitor to the …

Binary Vapor Liquid Equilibria Isobaric Systems, Ira Lichtenstein

Theses

Oalculations of activity coefficients for thirty isobaric binary systems from vapor-liquid equilibria data were made using the Gilmont equation© An extensive literature survey showed the Gilmont equation provides an excellent means of correlating equilibrium data in most binary isothermal systems° However, the Gilmont equation’s applicability to isobaric systems had not been satisfactorily proven, and became the object of this investigation.

The Gilmont equation gave satisfactory correlation of the binary isobaric data for various systems. The correlation was found to improve as the systems approached ideal behavior. The introduction of a temperature correction to the relative volatility, term improved the correlation …

Hydraulic Characteristics Of Showerdeck Trays, Sam Gordon Marx

Theses

The hydraulic operating characteristics of the showerdeck tray were investigated. Air-water studies were made using a four plate, 11 1/4 inch I. D. plexiglas column.

Entrainment, liquid froth height, and pressure drop data were obtained at varying liquid and vapor rates.

Entrainment was found to be a function of the plate spacing, liquid height on the tray, the liquid rate and the column vapor velocity. It was found to be independent of the vapor velocity through the perforations. An equation of entrainment as a function of these variables was derived.

The liquid froth height on a tray was found to …

Test 799: John Deere 2010 Ru Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Test 798: John Deere 1010 C Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Evaluation Of The Thermal Properties Of Plastic Laminates, Luciano Sedillo

Chemical and Biological Engineering ETDs

To insure the proper application of newly developed materials, it is necessary to evaluate their physical and chemical properties. In the case of plastic laminates for use as heat barrier material, thermal diffusivity is an important property. Thermal diffusivity is the parameter which governs the rate of temperature change through a material. Its value depends upon the chemical composition and the physical structure of the material and its temperature.

Cerenkov Radiation From An Electron Traveling In A Circle Through A Dielectric Medium, John Joseph Newman

Optical Science and Engineering ETDs

Two hardware configurations are discussed which might be used as vehicles for checking the accuracy of the theory. It is hoped that one of these configurations might lead to a device which would yield a useful amount of power in the submillimeter region of the microwave spectrum.

The Irish Plumber And Heating Contractor, June 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

An Experimental Study Of The Production Of Metallic Impregnations And Coatings -- A Vacuum Process, Engle D. Southard

Chemical and Biological Engineering ETDs

The purpose of this study undertaken was threefold, (1) to design and construct an experimental vacuum apparatus to produce a metal impregnated or coated material; (2) to study some of the variables which affect the process; then (3) to examine the physical characteristics of the resultant materials. Described herein is the development and operation of a vacuum system capable of producing conditions to permit the evaporation of metals to impregnate and coat various materials. The fundamental principle involved in this process is that a rarified atmosphere reduces the temperature required for metal evaporation and protects the metal vapor from reacting …

Comparison Of Pulse And Fm Radar Altimeters Based On Terrain Return Theory, David L. Quinlan

Electrical and Computer Engineering ETDs

In this paper a comparison of pulse of fm radar altimeters is made from the standpoint of the mathematical expressions describing each system’s return signal from terrain at near-vertical incidence. The pulse-fm radar relationships resulting from this comparison facilitates application of the extensive information gained in previous pulse radar studies to the investigation of fm radar terrain return and the associated design of fm radar altimeters, and may also assist in the development of the new pulse-type radars.

Thermodynamic Properties Of Formaldehyde, Raymond H. Koo

Theses

The thermodynamic properties of saturated and superheated formaldehyde were evaluated at ten degree temperature intervals from -19°C. to 400°C. and at various pressures up to 150 atmospheres.

Lydersen's correlations were used to estimate the critical constants.

Vapor pressure data were calculated using Riedel's method.

The generalized thermodynamic correlations of Hougen, Lydersen,'and Greenkorn were employed to obtain values of the thermodynamic properties in the saturated and superheated regions.

The values for temperature, pressure, specific volume, enthalpy, and entropy for saturated and super-heated formaldehyde are presented in the form of tables and graphs.

Effect Of Cleaning Methods Upon Electrochemical Behavior Of High-Carbon Steel Cathodes In A Chromic Acid Electrolyte, George Chaplenko

Theses

The quality of electrodeposited coatings is to a great ex- tent determined by cleaning or surface-conditioning methods employed in preparing the basis metal for plating. Cleaning pro- cedures are usually established empirically, by trial and error. Little or no experimental work was devoted to a quantitative stu- dy of measurable parameters that are influenced by the relative effectiveness of individual cleaning processes. The present ex- periment was designed in an attempt to establish a correlation between one such parameter (namely, the single-electrode poten- tial of polarized cathode) and the quality of subsequent plating.

High-carbon steel cathodes, -a material that is …

The Effects Of Operating Variables On The Adsorption Of Water From Iso-Propyl Alcohol Using Molecular Sieves, Warren P. Johnson

Chemical and Biological Engineering ETDs

The purpose of this paper is to present a study made on the effects of (1) feed concentration, (2) liquid flow rate, (3) column dimensions and (4) absorbent particle size on the selective absorption of water from iso-propyl alcohol with molecular sieves in a semi-continuous or fixed-bed operation.

A Flotation Process For The Concentration Of New Mexico Oolitic Iron Oxide Ores., William C. Rahmig

Chemical and Biological Engineering ETDs

The vast expansion in the production of steel in the twentieth century has turned the eyes of the steel industry toward sources of low grade iron ore. Evidence of this is dramatically presented in a recent issue of Steel Facts. Fifty two percent of the iron ore mined in the United States was concentrated before shipment to the consumers. This is an increase of 25 percent over the amount concentrated a decade ago. The marked increase will continue as technological advances light the way for economical are treatment.

Induction Heater Temperature Controller, Raymond A. Gore

Electrical and Computer Engineering ETDs

The author was presented with a system to control the power output of a radio frequency oscillator used for induction heating. The original system was unstable. It was stabilized but even then its performance was not satisfactory. Thus the problem was to design a satisfactory system using some of the components of the old system.

Conditional Effects In The Transistor Distributed Amplifier, Herbert D. Arlowe

Electrical and Computer Engineering ETDs

No abstract provided.

Numerical Analysis Of The Interaction Of An Oblique Shock Wave And A Laminar Boundary Layer, James K. Cole

Mechanical Engineering ETDs

When a shock wave impinges on a boundary layer the interaction involves the continuous, viscous behavior of a boundary layer with the almost discontinuous behavior of a shock wave. A boundary layer is the region of a moving fluid that is adjacent to a solid surface. The velocity of the fluid is zero at the surface. The viscosity of the fluid causes relatively large shearing stresses in boundary layers. A shock wave is a region of a fluid which has extremely large gradients of the particle velocity. Shock waves are often rep­resented by mathematical discontinuities. A shock wave is called …

A Method Of Measuring Temperature Changes Casued By Strong Shock Phenomena, Benjamin J. Goodier

Electrical and Computer Engineering ETDs

This thesis is concerned with the development of a method to measure the temperature of a metal surface during a time interval of a few microseconds while it is being subjected to a strong shock. The temperature of a special interest is the temperature of the free surface which appears after a strong shock has been reflected from that surface. This temperature remains constant until another shock wave is reflected from the surface, except for the change caused by heat loss to the surroundings by radiation.

Digital Computers And Their Application To Civil Engineering Problems, Richard G. Vaughan

Civil Engineering ETDs

Early in 1960 a study was undertaken by the author to become acquainted with the use and application of digital computers in the structural and civil engineering fields. After several months study and attendance, during the summer of 1960, at a National Science Foundation Institute on the use of digital computers in engineering, it was felt that the study could be expanded and presented in thesis form. The principal benefit from the study, other than the author's, will possibly be the integration into the civil engineering curricula of the material contained in the thesis.

The material as presented is the …

Adaptation Of Beggs Deformeter Apparatus To The Solution Of Three-Dimensional Problems, Roland L. Finley

Mechanical Engineering ETDs

In the area of structural analysis and structural design, numerous efforts have been made and more are yet to be made toward solving statically indeterminate problems easily and with a high degree of accuracy. Fortunately, the great majority of such problems can be solved by one or more of the many mathematical methods that are normally used. However, the mathematical solutions become exceedingly difficult if and when it is desired to use irregularly shaped structural members.

A Conversion Means Between The Crc-102a And Maniac I., Theodore E. Smart

Electrical and Computer Engineering ETDs

The University of New Mexico has acquired two general purpose computers; a CRC-102A and MANIAC I. The MANIAC I has been installed and is nearing operational status, while the CRC-102A has been in use for some time. When both computers are operating it will be desirable, in certain, cases, to program a problem for both. A means for translating a program for one of the machines into a program for the other with a minimum of manual effort would, therefore, be useful. The purpose of this project was to translate the commands for one computer into commands for the other …

The Use Of Ferrophosphorous And Manganese Ore In High Density Concrete For Radiation Shieding, Robert A. Crist Jr.

Civil Engineering ETDs

The scope of this thesis encompasses the investigation of the feasibilities of using a locally and/or readily available heavy aggregate for high density concrete. Such an aggregate was found to be available in Socorro, New Mexico. The Socorro Manganese Corporation has a stockpile of over 7,000 tons of high-grade manganese ore (specific gravity = 4.5) potentially suitable as a heavy aggregate, and some of which was used for this research. Along with the manganese ore was used ferrophosphorous, a very heavy aggregate manufacture by the Victor Chemical Works (specific gravity = 6.5), to obtain a range of densities that would …

Theory And Fabrication Of Point Contact Diodes Utilizing Reduced Single Crystal Rutile Tio2, Goebel Davis Jr.

Electrical and Computer Engineering ETDs

Single Crystal Rutile TiO2 upon reduction by heating in an atmosphere of hydrogen becomes a semiconductor, and the conductivity increases with the time and temperature of reduction. The reduction process creates oxygen vacancies with which there are associated two loosely bound electrons. These electrons may be raised to the conduction band by thermal excitation. Hence, an oxygen vacancy behaves like an impurity donor site.

The Use Of Compensation With Directional Couplers, Roland Alan Lincoln

Electrical and Computer Engineering ETDs

This thesis describes an improved technique for measuring voltage standing wave ratio (VSWR). The reflectometer system is analyzed, and an improved coaxial system is presented which more accurately measures VSWR.

The Control And Measurement Of Minute Curvatures In A Steel Shaft, Donald F. Wilkes

Mechanical Engineering ETDs

The primary purpose of this thesis was the solution of several special problems relating to the establishment, adjustment, and measurement of small elastic curvatures and the associated strains in a metal shaft. The solution of these problems was an important link in the development of a new type of seismometer for measuring extremely long periods with vibrations (up to 60 seconds). To achieve the sensitivity and long natural period of vibration required for accurate measurements of long-period waves, the seismometer employs a seismic mass which is suspended on an air film and constrained to follow an essentially horizontal guide rod. …

The Control And Measurement Of Minute Curvatures In A Steel Shaft, Donald F. Wilkes

Mechanical Engineering ETDs

The primary purpose of this thesis was the solution of several special problems relating to the establishment, adjustment, and measurement of small elastic curvatures and the associated strains in a metal shaft. The solution of these problems was an important link in the development of a new type of seismometer for measuring extremely long period with vibrations (up to 60 seconds). To achieve the sensitivity and long natural period of vibration required for accurate measurements of long-period waves, the seismometer employs a seismic mass which is suspended on an air film and constrained to follow an essentially horizontal guide rod. …

Computer Programs For Determining Radar Return Power And Fading Spectra, Chung Chia

Electrical and Computer Engineering ETDs

The properties of radar terrain return at near vertical incidence have been under investigation at the University of New Mexico with Sandia Corporation, Albuquerque, New Mexico, and the United States Naval Ordinance Test Station, China Lake, California.