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An X-Ray Diffraction Analysis Of The Lacro₃-Laalo₃ Solid Solution Series, Robin Ashley Murphy

Masters Theses

"A crystallographic study was made of powders from the LaCr_1-x Al_xO₃, La_.90(Mg_.05 Cr_1-x Al_x )_.95O_2.83 , and La_1±xCrO₃ systems. The relationships between composition and thermal expansion, electrical conductivity, and vaporization were also investigated. The x-ray diffraction data of the LaCrCO₃ - LaAlO₃ compounds showed the system to form a single phase solid solution for any given sample from the series. The orthorhombic to rhombohedral phase transition was depressed to below room temperature at approximately 13% Al⁺³ substitution"--Abstract, page ii.

Concrete Ships, Mark L. Lavache

Marine Affairs Theses and Major Papers

The incentive behind this study is based on a two-fold premise: 1) that a comprehensive outline of the historical development of concrete shipbuilding and its related technologies is either non-existent or defies discovery, and 2) that although this study is neither based on a hypothesis, nor intended to resolve a problem area or promote a position, its merit lies in its inductive nature. Included are explanations of of the various compositions, uses, and construction techniques relating to reinforced concrete, ferro-cement, and prestressed concrete.

Discussion, Ronald A. Kohser

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Disk And Strip Forging With Side Surface Foldower: Part 2: Evaluation Of The Upper-Bound Solutions, Ronald A. Kohser, B. Avitzur

Materials Science and Engineering Faculty Research & Creative Works

The upper-bound solutions developed in Part 1 are evaluated with regard to their ability to produce a lower value for required power (load, pressure, or work). Comparisons made with existing solutions such as the triangular field solution and one-zone bulge solution show that for strip, each solution has a domain of geometry and friction in which it is superior. The new solution produces a lower upper-bound for conditions of high interface, friction and relatively thin specimen, the area where fold over is the observed mode of flow. For solid cylindrical disks, the solution fails to improve upon existing analyses, but …

Effect Of Collagen And Chloride Additions On Electrolytic Copper Deposits, William P. Lorenz, Thomas J. O'Keefe, Carlo B. Sonnino

Materials Science and Engineering Faculty Research & Creative Works

The effects of collagen concentration and molecular weight on the morphology and crystal orientation of electrolytic copper deposits have been determined and compared. The effect of chlorides in the presence of collagen on the above properties has also been investigated. Three different molecular weight collagens were studied and the consumption rate of each was determined by chemical analysis of the electrolyte before and after electrodeposition. Two-hour deposits were made in an electrolyte containing the subject collagens in concentrations ranging from 1.2 to 38.4 mg 1-1. Scanning electron and light microscopes and X-ray diffraction were used to evaluate the electrodeposits. © …

The Effects Of Certain Impurities And Their Interactions On Zinc Electrowinning, Donald R. Fosnacht

Doctoral Dissertations

“The effects of germanium, antimony, arsenic, cobalt, glue, and free acid concentration were studied on both commercial and synthetic electrolytes. The effects of a single factor and the combined effects of multiple factors were elucidated. The temperature, zinc concentration, and current density were also varied. It was found that the acid concentration was the most critical factor when impurity levels were at normal plant solution concentrations. The ranges where the effect of the impurity became apparent were: greater than 20 ppb for antimony; 40 ppb for germanium; 120 ppb for arsenic; and 7-8 mg/l for cobalt for a solution containing …

Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang

Materials Science and Engineering Faculty Research & Creative Works

Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …

Assessment Of Feasibility Of Proposed Bolted Connections For Tubular Structures, John Henry Tausch

Dissertations and Theses

The search for new and additional sources of energy -- from sun, wind, waves, and ocean currents -- is necessitating the development of structures in the open environment of the oceans as well as on land. The advantages of round or tubular members for use in such structures are shown; and to avoid the uncertainties of welded joints, two bolted connections are proposed and their feasibility explored.

Dense Chromium Sesquioxide, P. D. Ownby

Materials Science and Engineering Faculty Research & Creative Works

A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr₂O₃ body is prepared by sintering Chromium Sesquioxide (Cr₂O₃) at essentially the equilibrium oxygen partial pressure (P_O2) for the formation of CrO ₃ from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added. In addition, Cr₂O₃ bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium Po, …

Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang

Materials Science and Engineering Faculty Research & Creative Works

Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …

19th Annual Conference On Analytical Chemistry

Rocky Mountain Conference on Magnetic Resonance

Program and abstracts from the 19th annual meeting of the Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 1-3, 1977.

A Comparison Of The Properties And Strengths Of Adhesives, Merwin Foster

Graduate Research Papers

This investigator teaches a course in junior high industrial arts in which students are exposed to a number of different adhesives. The text used in the industrial arts course classifies the types of adhesives and gives the procedure for using each one, but does not identify the properties of the adhesive or the safety knowledge essential for using them. The several kinds of adhesives used in this course have special properties which determine how and when to use them. To supplement the text and to provide more hands-on activity, a unit could be developed which would help students determine why …

Production Methods Of Wood Fiber Particleboard, Bruce Novak

Graduate Research Papers

The purpose of this study will be to investigate the development, production and use of particleboard, for the purpose of incorporating a unit in particleboard production, on a limited scale, into an industrial arts program.

D. C. Conductivity Of Magnetite And Nickel Ferrites, Nazeih M Botrous El Badramany

Archived Theses and Dissertations

No abstract provided.

Positron Lifetime As A Function Of Grain Size, Hollis P. Leighly

Materials Science and Engineering Faculty Research & Creative Works

Published data on positron annihilation lifetime in copper as a function of grain size have been analyzed to show that there is a linear relationship between the internal grain boundary surface area, per unit volume, S v, and the positron lifetime, τ. The analysis indicates that grain boundaries are important in the trapping of positrons. It is suggested that the slope of the resulting straight line, dS v/dτ, can be used to determine the annihilation rate of the grain boundaries. © 1977 Springer-Verlag.

A Laser Hydrophone, Steven Kenneth Barnoske

Retrospective Theses and Dissertations

This report proposes a novel technique for measuring of acoustic fields in water. A Laser Hydrophone is proposed taking advantage of the properties of Total Internal Reflection. A theoretical analysis of the idea is presented followed by a prediction of the operating characteristics of an actual system. Actual data were taken with the proposed system and it is compared to the predicted.

The Manufacturing Of Cement In Northern Iowa And The Strength Of Selected Concrete Mixes Using Compression Testing, James E. Gephart

Graduate Research Papers

Cement manufacturing is a process that has been developed and refined during past centuries. The end result of this process, cement, is able to meet the demands of an ever increasing technological world. The research was made so that the writer would develop as complete an understanding of the processes involved in the manufacture of cement as was possible during the time allotted for this research.

Low Order Correction For Subsurface Contributions In Diffusion Experiments, D. Powers, Manfred Wuttig

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

The Al2o3‐Sio2‐Zro2 Liquidus Surface: A Discussion, Charles A. Sorrell

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Glass In The Year 2000, Norbert J. Kreidl

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Subsolidus Equilibria And Stabilization Of Tetragonal Zro2 In The System Zro2‐Al2o3‐Sio2, Charles A. Sorrell

Materials Science and Engineering Faculty Research & Creative Works

The irreversible reaction between zircon and alumina to form mullite and zirconia was observed to proceed very slowly at 1480°C, confirming the existence of a stable join between mullite and zirconia in addition to the join between mullite and zircon. Attempts to determine equilibrium assemblages in powder samples of several combinations of the constituents at 1300° and 1400°C were unsuccessful. Metastable tetragonal ZrO₂ was observed in fired powder samples containing kaolinite, in fired zircon‐alumina samples, and in calcined gels prepared from zirconyl nitrate, aluminum nitrate, and colloidal silica in water. Tetragonal ZrO₂ was the dominant crystalline phase in …

Suggested Chemistry Of Zinc Oxychloride Cements, Charles A. Sorrell

Materials Science and Engineering Faculty Research & Creative Works

Solutions of ZnCl₂ were prepared from ZnCl₂·nH₂O and by reaction of zinc metal with HCl. Specific gravities and pH values were determined as a function of composition. A ternary phase, 4ZnO·ZnCl₂·5H₂O, was precipitated when the ZnCl₂ solutions were diluted to a pH of 5.48 ± 0.05. Mixtures of ZnO with ZnCl, and HCI solutions were equilibrated in sealed containers and analyzed by X‐ray diffraction. The resulting phase diagram shows 2 ternary phases, 4ZnO·ZnCl₂·5H₂O (4·1·5) and ZnO·ZnCl₂·2H₂O (1.1.2), both of which are soluble …

Classroom Analysis Of Various Plastics, Paul D. Harrington

Graduate Research Papers

In the junior high plastics course this writer. teaches, the students display more interest in the manipulative activities of the laboratory than in the sit-down classroom activities. The results of this tend to be a once-over-lightly treatment of the technical aspects of plastics and more hands on craft type activities in the laboratory. To bring more balance to the program, an activity needs to be devised which will have more industrial relevance. Such an activity should allow the students a certain amount of freedom and still provide them with technical information and acquaint them with the properties of various plastics. …

Evaluation Of Zinc Sulfate Electrolytes By Cyclic Voltammetry And Electron Microscopy, Bruce A. Lamping, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

A cyclic voltammetric technique has been developed for approximating the quantities of active chemical species present in zinc sulfate electrolytes. The experimental apparatus consisted of a Pyrex "H" cell, an aluminum cathode encased in a Teflon holder, a carbon anode and a mercurous sulfate reference electrode. Voltammograms were obtained using industrial, purified neutral leach solution (Cominco Ltd., Trail, BC) acidified to give a final concentration of 0.77 M Zn++ and 1 M H2SO4. The polarization curves were then evaluated and used as reference standards to compare with results obtained when various organic and inorganic additions were made. The deposit morphologies …

18th Annual Rocky Mountain Spectroscopy Conference

Rocky Mountain Conference on Magnetic Resonance

Final program and abstracts from the 18th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 2-3, 1976.

Ua64/3 Readout, Wku Industrial Education & Technology

WKU Administration Documents

Newsletter includes articles:

• Construction Complete on Environemental Science & Technology Building
• Wendt, Donald. Some Reflections on teh Kentucky Industrial Education Association
• Tomazic, Norman. Technology Assessment A Step Toward a Humanized Technology
• Frank Pittman has Individualized Course Published
• Lowrey, H.J. Industrial Arts in a Changing Society
• H.B. Clark
• Growing Interest, re: Architectural Drafting
• Old Building Begins Renovation
• Walter Nalbach: Craftsman at Home

Intermetallic Reactions In Vacuum-Deposited Nickel And Gold Films On (111) Silicon Single Crystals, K. H. Yoon, Gordon Lewis, L. L. Levenson

Materials Science and Engineering Faculty Research & Creative Works

Pure nickel and gold thin films were vacuum-deposited on (111) silicon single crystals. When Ni/Au/Si or Au/Ni/Si samples were heated to about 550° in situ, hexagonal or deformed hexagonal shaped crystallites were formed on the silicon substrates. The composition of these crystallites was determined by using x-ray diffraction, scanning electron microscopy and scanning Auger microprobe methods. The crystallites were identified as NiSi2. The crystal-lites on the (111) silicon plane parallel to the surface appeared as regular hexagons while the inclined crystal-lites resembled trapezia. The results of Auger spectra and in-depth composition profiles for Ni, Au, and Si showed that the …

Electrical Degradation In High Purity Barium Titanate, Jeffrey Duncan Keck

Doctoral Dissertations

"The stability of BaTiO₃-type insulators to DC fields has long been recognized as one of the important factors in determining the quality of a capacitor which uses such a material as its dielectric. The slow increase of the electrical conductivity of an insulator which is stressed by DC fields at levels below the breakdown strength is normally termed degradation. Since degradation is a very common malady to the ceramic capacitor manufacturers, many studies have been conducted over the past two decades in efforts to learn how to remedy the problem.

The results of previous studies have shown that …

On The Effects Of Antimony And Glue On Zinc Electrocrystallization Behaviour, D. J. Robinson, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

An investigation has been made to determine the effects that additions of glue and antimony have on the electrowinning of zinc from acid sulphate solutions. In particular, the zinc crystal growth and cathode current efficiencies were studied in an attempt to establish a correlation between morphology and the nature of the additives. Operating conditions of 55 A ft-2* and 35°C were used for most of the experiments with electrolyte concentrations of approximately 55 gl-1 zinc and 150 gl-1 H2SO4. Additional runs were made at 40,75 and 100 Aft-2 at 30,40 and 50°C in order to verify certain trends. Primarily by …

Interpretation Of Some Of The Basic Features Of Field-Ion Image Projections From A Hemispherical To A Planar Surface Using Moire Patterns, P. D. Ownby, Robert M. Doerr, Walter Bollmann

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.