317 Matching Results

Search Results

Results: 1 - 24 next
open access

Low temperature heat capacity of lutetium and lutetium hydrogen alloys

Description: The heat capacity of high purity electrotransport refined lutetium was measured between 1 and 20/sup 0/K. Results for theta/sub D/ were in excellent agreement with theta values determined from elastic constant measurements. The heat capacity of a series of lutetium-hydrogen solid solution alloys was determined and results showed an increase in ..gamma.. from 8.2 to about 11.3 mJ/g-atom-K/sup 2/ for hydrogen content increasing from zero to about one atomic percent. Above one percent hydrogen ..g… more
Date: October 1, 1977
Creator: Thome, D. K.
Partner: UNT Libraries Government Documents Department
open access

Polariton effects in naphthalene crystals

Description: The experimental verification of the two-step nature of energy dissipation of photon energy by a crystal is the subject of this dissertation. The ..cap alpha..(O,O) Davydov component of the lowest energy singlet transition in pure strain-free napthalene single crystals is shown to exhibit an increase in absorption with increasing temperature, due to an increase in polariton damping via polariton-phonon scattering processes. (GHT)
Date: October 1, 1977
Creator: Robinette, S. L.
Partner: UNT Libraries Government Documents Department
open access

Synthesis and characterization of an N-(2-hydroxyethyl)-ethylenediaminetriacetic acid resin

Description: A chelating ion-exchange resin with N-(2-hydroxyethyl)ethylene-diaminetriacetic acid (HEDTA) used as the ligand chemically bonded to XAD-4 by an ester linkage, HEDTA-4, was synthesized. It is stable under normal experimental conditions with the liquid chromatograph. The structure of the resin was confirmed by an infrared spectrum, and by potentiometric titrations. The capacity of the resin was also obtained by potentiometric titration and by a nitrogen analysis. The resin was used to pack a col… more
Date: October 1, 1977
Creator: Lai, Y. F.
Partner: UNT Libraries Government Documents Department
open access

Electron microscopy of hydrocarbon production in parthenium argentatum (guayule)

Description: The electron microscope was used to study the biological processes involved in hydrocarbon production. The little desert shrub Guayule (Parthenium argentatum) was selected for study. This shrub can produce hydrocarbons (rubber) in concentrations up to 1/4 of its dry weight. It grows on semi-arid land and has been extensively studied. The potential of Guayule is described in detail. Results of an investigation into the morphology of Guayule at the electron microscope level are given. Experiments… more
Date: November 1, 1977
Creator: Bauer, T.E.
Partner: UNT Libraries Government Documents Department
open access

Stress induced reorientation of vanadium hydride

Description: The critical stress for the reorientation of vanadium hydride was determined for the temperature range 180/sup 0/ to 280/sup 0/K using flat tensile samples containing 50 to 500 ppM hydrogen by weight. The critical stress was observed to vary from a half to a third of the macroscopic yield stress of pure vanadium over the temperature range. The vanadium hydride could not be stress induced to precipitate above its stress-free precipitation temperature by uniaxial tensile stresses or triaxial tens… more
Date: October 1, 1977
Creator: Beardsley, M. B.
Partner: UNT Libraries Government Documents Department
open access

Electromigration of hydrogen and deuterium in vanadium, niobium, and tantalum

Description: The electric mobility and effective valence of hydrogen and deuterium in vanadium, niobium, tantalum and three niobium-tantalum alloys were measured. A resistance technique was used to directly determine the electric mobility of hydrogen and deuterium at 30/sup 0/C while a steady-state method was used to measure the effective valence. The use of mass spectrographic techniques on a single specimen which contained both hydrogen and deuterium greatly increased the precision with which the isotope … more
Date: October 1, 1977
Creator: Jensen, C. L.
Partner: UNT Libraries Government Documents Department
open access

Use of a semiconductor laser in infrared spectroscopy

Description: A semiconductor laser has certain properties which makes its use desirable as a continuous monitor of atmospheric pollutants. Its energy output is concentrated in widely separated energy modes of very narrow bandwidths (less than 10/sup -5/ cm/sup -1/) which can be centered on one infrared absorption line of one gas. This makes the laser quite selective. The energy in each mode is typically greater than 200 ..mu.. watts, and, because of the laser's small size, its light energy can be colli… more
Date: December 1, 1977
Creator: Morris, R. N.
Partner: UNT Libraries Government Documents Department
open access

Inductively coupled plasma--atomic emission spectrometry: trace elements in oil matrices

Description: The simultaneous determination of up to 20 trace elements in various oil matrices by inductively coupled plasma-atomic emission spectrometry is reported. The oil matrices investigated were lubricating oils (for wear metals), fuel oil, centrifuged coal liquefaction product, crude soybean oil, and commercial edible oils. The samples were diluted with appropriate organic solvents and injected into the plasma as an aerosol generated by a pneumatic nebulization technique. Detection limits of the 28 … more
Date: December 1, 1977
Creator: Peterson, C. A.
Partner: UNT Libraries Government Documents Department
open access

Analytical applications of resins containing amide and polyamine functional groups

Description: A dibutyl amide resin is used for the separation of uranium(VI), thorium(IV), and zirconium(IV) from each other and several other metal ions. Uranium(VI) and thorium(IV) are determined in the presence of large excesses of foreign metal ions and anions. A practical application of the amide resin is studied by determining uranium in low grade uranium ores. The amide resin is also used for the selective concentration of gold(III) from sea water.
Date: December 1, 1977
Creator: Orf, G. M.
Partner: UNT Libraries Government Documents Department
open access

Dislocation morphology in deformed and irradiated niobium. [Neutron irradiation]

Description: Niobium foils of moderate purity were examined for the morphology of dislocations or defect clusters in the deformed or neutron-irradiated state by transmission electron microscopy. New evidence has been found for the dissociation of screw dislocations into partials on the (211) slip plane according to the Crussard mechanism: (a/2) (111) ..-->.. (a/3) (111) + (a/6) (111).
Date: June 1, 1977
Creator: Chang, C. P.
Partner: UNT Libraries Government Documents Department
open access

Lanthanide extraction with 2,5-dimethyl-2-hydroxyhexanoic acid

Description: This research is concerned with the solvent extraction into chloroform of the lanthanides, using 2,5-dimethyl-2-hydroxyhexanoic acid (DMHHA). This acid is the first ..cap alpha..-hydroxy aliphatic acid to be studied as an extracting agent for the lanthanides. The chloroform-water DMHHA partition constant was determined to be 1.0 (at 0.1 M ionic strength and 25/sup 0/C). The acid dimerizes in chloroform with a constant of 56. The light lanthanides can be extracted into chloroform by forming comp… more
Date: December 1, 1977
Creator: Miller, J. H.
Partner: UNT Libraries Government Documents Department
open access

Investigation of high energy runaway electron confinement in the Oak Ridge tokamak

Description: High energy runaway electrons in the Oak Ridge tokamak ORMAK have been investigated through measurement of the bremsstrahlung produced when these electrons leave the discharge and strike the limiting aperture of the torus. The experimental results have been interpreted in terms of a classical single-particle model appropriate for collisionless particles in a tokamak, and it has been found that most of the confinement properties of high energy runaways in ORMAK can be understood on this basis. A… more
Date: November 1, 1977
Creator: Zweben, S. J.
Partner: UNT Libraries Government Documents Department
open access

Heated uranium tetrafluoride target system to release non-rare gas fission products for the TRISTAN isotope separator. [As replacement for uranyl stearate]

Description: Off-line experiments indicated that fluorides of As, Se, Br, Kr, Zr, Nb, Mo, Tc, Ru, Sb, Te, I and Xe could be volatilized, but except for Br, Kr, I and Xe, none of these elements were observed after mass separation in the on-line experiments. The results of the on-line experiments indicated a very low level of hydride contamination at ambient temperature and consequently, uranium tetrafluoride replaced uranyl stearate as the primary gaseous fission product target. Possible reasons for the fail… more
Date: October 1, 1977
Creator: Gill, R. L.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of self-interaction parameters from binary phase diagrams

Description: The feasibility of calculating Wagner self-interaction parameters from binary phase diagrams was examined. The self-interaction parameters of 22 non-ferrous liquid solutions were calculated utilizing an equation based on the equality of the chemical potentials of a component in two equilibrium phases. Utilization of the equation requires the evaluation of the first and second derivatives of various liquidus and solidus data at infinite dilution of the solute component. Several numerical methods… more
Date: October 1, 1977
Creator: Ellison, T. L.
Partner: UNT Libraries Government Documents Department
open access

Multiconfigurational electronic wavefunctions in the full optimized reaction space: the isomerization of nitrosyl hydride to nitrogen hydroxide in the lowest singlet and triplet states

Description: Energy curves are determined for the lowest singlet and triplet states of the HNO molecule. The geometry is varied in that the hydrogen moves through 13 positions around the NO core to describe the isomerization reaction HNO yields HON. Quantitatively determined are the stable and metastable equilibrium positions in both states, the energy differences between these two equilibrium positions and between the two states, and the barriers with respect to isomerization. The calculations are carried … more
Date: December 1, 1977
Creator: Dombek, M. G.
Partner: UNT Libraries Government Documents Department
open access

Electronic transitions of some pi-molecular charge transfer complexes. [Anthracene--pyromellitic dianhydride (PMDA) or pyrene--PMDA in naphthalene--PMDA host]

Description: A unique phonon progression in the phosphorescence spectrum of pyrene-PMDA (Py-PMDA) in naphthalene-PMDA (N-PMDA) is reported. Calculations of the electron-phonon coupling strength parameter for the ground and excited states indicate strong coupling for the fractional CT contribution of Py-PMDA to the observed phosphorescent state. Model calculations indicate that the observed low frequency phonon mode corresponds to a low energy rotation of the rigid guest complex and not a symmetric donor-acc… more
Date: December 1, 1977
Creator: Beckman, R. L.
Partner: UNT Libraries Government Documents Department
open access

Piano Sonata by Elliott Carter: A Foreshadowing of His Later Style, a Lecture Recital, Together with Three Recitals of Selected Works

Description: The lecture recital was given January 22, 1977. A discussion of Elliott Carter's Piano Sonata emphasized those compositional techniques which foreshadowed important compositional procedures in many of his later works. The following compositions were discussed: Concerto for Orchestra, Double Concerto for Harpsichord and Piano with Two Chamber Orchestras, 8 Etudes and a Fantasy for Woodwind Quartet, Holiday Overture, Piano Concerto, Sonata for Flute, Oboe, Cello, and Harpsichord, Sonata for Violo… more
Date: May 1977
Creator: Wilhite, Carmen Irene
Partner: UNT Libraries
open access

A Survey of the Use of Computers at State-Supported Senior Colleges and Universities in the United States

Description: The purpose of this study was to determine the use of the computer in higher education at state-supported senior colleges and universities in the United States. The following findings and conclusions are based on the information gained from the study. 1. The average number of years computers have been used by institutions of higher education is ten. The length of time increases with both the level of offering and the enrollment of the institution. 2. A greater emphasis is placed on administrati… more
Date: May 1977
Creator: Anderson, John W., 1944-
Partner: UNT Libraries
open access

Early English Organ Music: Some Contributions from the Mulliner Book of W. Blitheman, T. Tallis and J. Taverner: Together with Three Recitals of Selected Works of J. S. Bach, D. Buxtehude, M. Duruflé, C. Franck, G. Frescobaldi, J. J. Frogerber, P. Hindemith, O. Messiaen, M. Reger, J. H. Tallis, and C.-M. Widor

Description: The lecture recital was given April 16, 1971. An Excellent Meane, six settings of Gloria Tibi Trinitas, Eterne rerum conditor, and Te Deum laudamus by William Blitheman, In Nomine by John Taverner, and Ecce tempus idonem by Thomas Tallis were performed, together with a choir of four men's voices, following a lecture on various aspects of organ music in early Tudor England. In addition to the lecture recital, three other public recitals, all solo programs, were performed. The first solo recital,… more
Date: December 1977
Creator: Lowry, David Michael
Partner: UNT Libraries
open access

The Effects of a Systematic Training Program in Responding Skills on Dental Hygiene Students at Texas Woman's University

Description: The purposes of this investigation were (1) to determine if a systematic training program in communication skills could be used to improve written response levels of dental hygiene students, and (2) to determine if a systematic training program in communication skills could yield improved dental hygiene student-patient rapport. The experiment involved two groups of dental hygiene students that had previously been randomly selected and consisted of twelve junior and twelve senior students in eac… more
Date: May 1977
Creator: Wallace, David W.
Partner: UNT Libraries
open access

Financial Leverage and the Cost of Capital

Description: The objective of the research reported in this dissertation is to conduct an empirical test of the hypothesis that, excluding income tax effects, the cost of capital to a firm is independent of the degree of financial leverage employed by the firm. This hypothesis, set forth by Franco Modigliani and Merton Miller in 1958, represents a challenge to the traditional view on the subject, a challenge which carries implications of considerable importance in the field of finance. The challenge has led… more
Date: December 1977
Creator: Brust, Melvin F.
Partner: UNT Libraries
open access

Perceived Effect of the Quarter System on the Programs of Selected Middle Schools in the State of Texas

Description: The problem of this study was to analyze the effect that a legislature-mandated quarter system was having on certain selected middle schools in the State of Texas, Some educators have claimed that the quarter system makes it possible to add flexibility to school programs. This study, therefore, was an attempt to find out if local school districts were taking advantage of this opportunity. A second goal of the study was to determine how principals, teachers, and curriculum directors felt about t… more
Date: August 1977
Creator: Acuff, George D.
Partner: UNT Libraries
open access

An Examination of the Hawthorne Effect in a Verbal Learning Situation in an Educational Setting

Description: This study was an examination of the Hawthorne Effect in a verbal learning situation in an educational setting. The Hawthorne Effect was defined as the facilitating effect(s) produced in experimental situations when the subjects of the experiment expect that they are the objects of special attention. The purpose of the study was to determine if contamination by the Hawthorne Effect existed in an educational setting. Comparisons were made between "experimentally inexperienced" subjects and "expe… more
Date: December 1977
Creator: Simpson, Bert L.
Partner: UNT Libraries
open access

Corporate Planning and Forecasting: An Analysis of the State of the Art in the Service Industry and Development of a Generalized Approach for the Needs of the 1970's and the 1980's

Description: This study has a twofold purpose. The first is to demonstrate the state of the art of corporate planning and forecasting activity, and the second is to determine the existence of any differences between the planning practices of the consumer service industry and the producer service industry. The study is organized into seven chapters. The introduction chapter contains background information, a description of the problem and opportunity followed by a definition of terms, the purpose of the rese… more
Date: May 1977
Creator: Subramanian, Bala R.
Partner: UNT Libraries
Back to Top of Screen