Digital Commons Network^™

Search For Economic And Universal Housing Systems -- Some Design And Construction Experience, Zenon A. Zielinski

International Symposia on Low Cost Housing Problems

No abstract provided.

The Mobile Home Is Low-Cost Housing -- Or Is It?, Walter L. Meyer

International Symposia on Low Cost Housing Problems

No abstract provided.

Low Cost Housing Projects In India, A. R. Santhakumar

International Symposia on Low Cost Housing Problems

No abstract provided.

Increasing The Productivity Of Housing Development Corporations, Carol Van Astyne

International Symposia on Low Cost Housing Problems

No abstract provided.

The Fe-Ho Binary System, G. J. Roe, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

The Fe-Ho phase diagram was determined on the basis of data obtained by X-ray diffraction, metallographic and differential thermal analysis techniques. Since emphasis was centered in the region where intermetallic compounds predominate, neither the iron nor holmium terminal regions were included in this study. Eutectic reactions were found to occur at 16.5 wt pct Fe and 875° C, 61 wt pct Fe and 1284° C, and 79 wt pct Fe and 1338° C. The congruent melting points of the compounds Ho6Fe23 and Ho2Fe17 were found to be 1332° and 1343° C, respectively. Two other intermetallic compounds were found, HoFe2 and …

An Optimization Technique Applied To The Determination Of Modal Damping Coefficients, Craig C. Smith

Theses and Dissertations

Although analytical techniques are generally available for the simulation of dynamic systems, often these techniques require a great deal of computer time and storage. This difficulty was vividly pointed out by a previous thesis undertaken in this Department by R. L. Webster (1). Mr. Webster undertook the determination of orthotropic material properties using dynamic response test data from plates. A major difficulty which was encountered was the enormous amount of computer time required for the simulation. This thesis is an investigation of a method which when fully developed, may provide the ability to simulate such systems much more efficiently.

Rotating Cylinder Apparatus For Rarefied Gas Flow Studies, Darryl J. Alofs, George S. Springer

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A rotating cylinder type apparatus is described, suitable for determining drag in cylindrical Couette flow of rarefied gases, and for evaluating tangential momentum accommodation coefficients at gas-solid boundaries. The apparatus is equipped with a damping device using diffusion pump oil for eliminating undesirable oscillations in the system. Tangential momentum accommodation coefficients of argon on aluminum were determined with an accuracy of ± 2.5%. The results obtained indicate that the apparatus may be used over a wide pressure range, corresponding to free molecule and continuum flow conditions.

A Numerical Solution To The Problem Of Rotation Near The Ground, David D. Chen

Mechanical & Aerospace Engineering Theses & Dissertations

No abstract.

A Study Of Elasto-Viscous Material Under Moving Rigid Wheel, Sou-Nan Wang

Civil & Environmental Engineering Theses & Dissertations

This thesis is considered as the solution of interaction between aircraft wheel and soil under landing of airplane. After treating soil as elasto-viscous material, we get a set of non-linear differential equations, such as momentum equations, in viscous region.

A numerical method, Marker-and·-Cell (MAC) method, was used to solve these equations. All data and curves are obtained by using CDC 6600 computer.

On The Classification Of The Solution Space Of Linear Anisotropic Elasticity, Richard Clement Carman

Dissertations

A method is developed within the framework of Synge's function-space interpretation of problems in linear elasticity which allows the consideration of solutions to problems for anisotropic media in terms of the solutions of a corresponding isotropic problem and corresponding simpler anisotropic problems. The isotropic solution and simpler anisotropic solutions establish points in each of the statically and kinematically admissible spaces for the anisotropic problem. The established points are used to define sets of vectors in the statically and kinematically admissible spaces. The linear independence of these vectors can then be determined by a pair of criteria developed in this work. …

The Absorption Of Hydrogen Chloride From Dilute Air Mixtures, Edgar L. Demarest

Theses

A study was made of the absorption of hydrogen chloride from air mixtures containing from 1 to 40 mgm. HCl/liter (1000 to 40000 mgm./m.³), using a.4" diameter tower packed with 2" Intalox saddles, irrigated with water or with sodium hydroxide solutions of 0.3% to 3.8% concen?tration. Gas flow rates of 177 to 752 lbs./(hr.)(ft.²) were investigated at three liquid rates: 2960 ; 4260, and 5700 lbs./(hr/)(ft.²). All data were collected below the flooding point.

Correlations of the height of a transfer unit with the superficial gas velocity were prepared for water and for sodium …

Aiir Pollution Emissions From Turbine Powered Aircraft, Raymond Arthur Filippini

Theses

The major pollutants that are emitted by jet aircraft include: particulate matter (soot), carbon monoxide, aldehydes, hydrocarbons, and nitrogen oxides. The first of the pollutants, particulate matter (smoke), constitutes not only a visual nuisance but is also a potential health problem. The rest, which are not visible, are irritants and in high enough concentrations can be toxic.

Since pollutants emitted by jet aircraft are of the same type as those given off by a car, a direct comparison is possible. In one landing take off cycle (LTO), a four engine jet aircraft emits the same amount of particulate matter as …

The Relation Of Heat Transfer To Power Consumption Of Liquids In Turbulent Flow, John D. Bien

Theses

The relationship between the heat transfer ability and the power input requirement of liquid coolants in a turbulent heat transfer condition was investigated. A correlation in terms of the liquid physical properties and the required volumetric flow was proposed and the use of this correlation in selection of liquids as coolant was discussed. The optimum condition for a high heat transfer/power input ratio was also discussed.

A Digital Computer Simulation Of A Batch Or Semi-Batch Reactor, Robert Edward Viczorek

Theses

A digital computer simulation of a batch or semi-batch reaction was developed. The system consisted of a jacketed, agitated vessel equipped with a temperature controller modulating a control valve in the stream to the jacket. The reaction was liquid phase, and the jacket medium was liquid.

The program was written in a general form so as to be applicable to any liquid phase reaction with minimum modification.

A numerical technique was employed using initial values of the process variables in the first cycle of calculations for a time interval, and then using average values for further iterations. The simulation proceeded …

Plastics: Mold Design And Fabrication, Duane H. Rippe

Graduate Research Papers

Students have often asked if additional molds were available which would make different objects other than golf tees. Literature provided with the injection molder described several methods of mold construction which could be fabricated in the school shop. The writer considered the possibility of making another mold, however, a time factor and limited experience prohibited construction.

The problem seemed to be appropriate for the Projects Course 33:270 at the University of Northern Iowa. The course and research involved would assimilate the needed information to construct a mold and to teach plastic injection mold construction more effectively.

Triaxial Stress Effects In Weldments Associated With The Heat Affected Zone, Rohit A. Mehta

Theses and Dissertations

The welding of steel occupies an important place as a major fabricating process in industry. The welding of steel has been a subject of research for many years, and much information has been obtained about the strength of weldments.

An Investigation Of A Computer Technique For Determining The Characteristic Parameters Of A Viscoelastic Model With Hysteresis Effects From Transient Experimental Data, Stephen Jack Clark

Theses and Dissertations

The object of this work was to develop a computer technique for determining the characteristic parameters of spring-mass system with hysteresis effects from transient experimental data. The technique was intended to be utilized to determine the parameters of models of systems where complex geometry and rate dependent properties would make a determination of the model parameters most difficult, and where the parameters typically obtained from static test would not characterize the rate dependent properties accurately.

Dynamic Stress Concentrations About An Epilliptical Discontinuity In An Elastic Solid, Kenneth Roy Schroll

Dissertations

The redistribution of dynamic stresses caused by the presence of an elliptical discontinuity in an infinite isotropic homogeneous elastic solid is examined. The solutions are obtained for the special cases of the rigid immovable inclusion and the vacuous cavity inclusion, and numerical results are presented.

The solutions to the wave equations in elliptical coordinates are expressed in series of the elliptical geometry eigenfunctions. Application of the boundary conditions, vanishing displacements for the rigid immovable inclusion and vanishing stresses for the cavity inclusion, yields in each case two infinite sets of linear algebraic equations for the expansion coefficients of the series …

The Oxidation Of Sulfur Dioxide In A Regenerative Reactor, Raymond Henry Edgecomb

Theses

A novel dual-unit sulfuric acid converter is depicted that performs in cyclic operation in unsteady state. A mathematical model and IBM 1130 Computer program were developed to show the temperature and conversion profiles in commercial-sized vanadium oxide catalyst beds. In the catalytic oxidation of sulfur dioxide conversions of 95-97% were attained without benefit of conventional heat exchangers. A single exchanger operating in conjunction with the dual-unit system might attain conversions as high as 99%.

Effect Of Column Diameter On Mixing In Water Fluidized Beds, Donald P. Schiesl

Theses

In this investigation, the effect of column diameter and flow rate on the mixing characteristics of fluidized beds were studied.

Tests were made on columns of 4, 6, 8 and 10 inches in diameter using water to fluidize glass beads of 0.0185 inches in diameter. The tests were run both at minimum and three times minimum fluidization. Step, impulse, and sinusoidal forcing signals were fed to the columns, using a sodium chloride solution as a tracer with the inlet and outlet concentrations being monitored continuously by a conductivity recorder.

The result of this study showed increased fluid dispersion with increasing …

The Application Of A Non-Newtonian Rheological Equation To Low-Density Polyethylene, Jeffrey N. Goldstein

Theses

A generalized non-Newtonian equation describing the rheology of molten thermoplastics is verified for low-density polyethylenes. The equation is extended to account for both rheological temperature dependency and polyethylene molecular weight dependency. The prediction of the rheology of new polyethylenes without additional experimentation is thus possible.

The Computer Evaluation Of The Natural Frequencies Of Vibrating Circular Plates With Free, Fixed And Simply Supported Edges, Thomas Michael Juliano

Theses

The natural frequencies of the transverse vibration of a thin, isotropic, circular plate with free, clamped, and simply supported edge conditions were studied extensively. The frequency equation for each edge condition was derived from the classical partial differential equation of plate vibration. These equations, which are in terms of Bessel functions, were then solved numerically to find the natural frequencies. Since the accuracy of the Bessel function values is very important in evaluating these frequencies, a comprehensive digital computer program was devised to calculate these values to eleven digit accuracy. In this Bessel function program four different methods were required …

A Study Of The Secant Law For Sporadic E, Ruey-Yuan Han

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The secant law is the relationship between the frequencies of a vertically incident wave and an obliquely incident wave that are reflected from the same level (i.e., density) of a stratified ionosphere. This thesis investigates the validity of the secant law applied to sporadic E.

Sporadic E data from two backscatter sounders and one vertical incidence ionosonde located in Japan were studied to test the validity of the secant law. The B-scan photos of the backscatter sounders were searched for E_s patches which were then compared with the sporadic E parameters defined for vertical incidence ionograms.

Finally, two theoretical …

Estimating The Rainfall-Runoff Characteristics Of Selected Small Utah Watersheds, Clive H. Walker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Runoff and rainfall data have been taken from three high mountain Utah watersheds and subjected to runoff to rainfall comparisons. The resulting Q/P ratios have been compared to the average volumes of runoff curve numbers (CN) computed from this data for each watershed. Runoff curve numbers were also estimated on the basis of the soils and vegetation data available for the watersheds.

An attempt has been made to estimate the watershed lag characteristics by computing synthetic hydrographs for successively larger values of time to peak estimates until the best fit comparison was achieved between the snythetic and the actual hydrographs. …

An Investigation Of A Gas Measurement Technique Employing Ultraviolet Excitation, Alphonso Vincent Diaz

Physics Theses & Dissertations

A study was undertaken to determine the general applicability of a temperature measurement technique which uses the fluorescence stimulated by a vacuum ultraviolet continuum as the indicator. This study was directed toward determining the temperature of nonradiating carbon monoxide. A number of ultraviolet radiation sources which produced high intensity in the region of l,150 A were investigated. This study led to the conclusion that the technique was not applicable to measurements in carbon monoxide within the present limits of' detectability.

Field Manual Fm 55-8, Transportation Intelligence, 12 March 1970, Robert Bolin , Depositor

United States Department of Defense Military Intelligence

Obviously, reliable information about potential enemy transportation equipment, facilities, systems, capabilities is vital, since our forces may need to prevent an enemy from using them and we may need to use them. Transportation or mobility intelligence is such reliable information. This is a very thorough document describing the collection, production, and dissemination of transportation intelligence. The emphasis of this manual is collection of relevant information in the field.

The manual describes organizations and personnel in the army responsible for collecting transportation related information. It identifies the national-level military intelligence production agencies as:

(a) The Defense Intelligence Agency (DIA) which was …

Slip-Form Paving, Kerry P. Magan

Kentucky Transportation Center Research Report

The proper placement, consolidation, and finishing of low-slump concrete without the aid of pre-erected side, forms has been widely acclaimed as an economical and effective procedure in the construction of portland cement concrete pavements. This construction procedure, commonly referred to as slip-form paving, depends upon the ability of low-slump concrete to remain in place after consolidation and removal of forms.

Slip-form pavers differ from conventional pavers in that no fixed side forms are required inasmuch as the slip-form paver has side forms that advance with the machine. Concrete is merely deposited on the prepared subgrade in front of the machine, …

Progress Report On Studies Of Hydraulic Geometry Of Large Bed Element Streams, Dean F. Peterson

Reports

This study developed a general method for estimating runoff rates and associated confidence limits of a given recurrence interval for ungaged small urban watersheds. The utility of the method developed was demonstrated through its application to a southeast region of Texas. Some 200 historical rainfall-runoff events from 40 watersheds in the Houston, Austin, Dallas, and Fort Worth urban areas were analyzed. Watershed data such as drainage area, percent of urbanized area channel length, average channel slope, land slope, and soil type are documented. Total rainfall amounts, intensities, durations, and mass-time distributions were determined for each storm and used to develop …

Systems Analysis Of Hydrologic Problems, J. Paul Riley, Diana Averett

Reports

Introduction: Increasing national and international interest in water resources in recent years has stimulated much new activity and progress in hydrology. It is now generally recognized that the science of hydrology is basic to an understanding of water resources problems and to planning for water resources development. Accompanying this demand upon the science of hydrology is an urgent need for improved education at the university level. In resopnse to this need for improved education, the First International Seminar for Hydrology Professors was held at Urbana, Illinois, in July 1969. The Second International Seminar was held at Logan, Utah, during August …

Publications Of The Utah Water Research Laboratory, Utah Water Research Laboratory

Reports

No abstract provided.