Physical Sciences and Mathematics Commons^™

X-Ray Induced Luminescence Of Sapphire And Ruby, Ivan Collier Jr.

Masters Theses & Specialist Projects

Over the past decade the luminescence properties of sapphire (∝-AL₂O₃) and ruby (Al₂O₃:Cr₂O₃) have been the subject of many investigations because of their importance in materials technology. Sapphire and ruby are at present used as lasing materials, radiation dosimeters, and as optical windows. In order that these operations may be made more efficient, and that other useful luminescent properties may be systematically explored and developed, much attention has been given to understanding the luminescent mechanisms from the standpoint of the physics of the solid state. However, mechanisms have …

The Synthesis And Photolysis Of Kreysiginone And The Syntheses And Antibacterial Activity Of 1-Vinyl-3,4-Dihydroisoquinoline Methiodides, Bruce L. Jensen

Dissertations

No abstract provided.

The Reaction Of Acetaldehyde With Some Cobalt (Iii) Complexes Containing Coordinated Glycine, James C. Dabrowiak

Dissertations

No abstract provided.

The Chemistry Of Dehydronaphthalene, Richard Harold Hales

Theses and Dissertations

The reaction of monohalonaphthalenes with potassium t-butoxide in a t-butyl alcohol-dimethyl sulfoxide (DMSO) mixture has been studied. The 1-bromonaphthalene reaction was extensively studied. Fifteen identifiable products were observed and conditions were found where the desired products, 1- and 2-t-butyl naphthyl ethers (V and VI) were formed in maximum yield, and their decomposition products, 1- and 2-naphthol (XIV and XV), were formed in minimum yield. The mole percent ratio of 1-substituted products (V and XIV) to 2-substituted products (VI and XV) was found under standardized conditions to be 0.35 ± 0.03 in every case when the halogen was I, Br and …

The Effects Of Various Treatments On Thiamin Diphosphate And Total Thiamin Levels Of Rat Tissues, Dong Hwa Park

Theses and Dissertations

Tissue thiamin diphosphate was assayed enzymatically utilizing purified brewer's yeast apotransketolase. With this assay ten uumoles of thiamin diphosphate could be detected. Total thiamin was fluorometrically measured. For one to three days rats were placed under conditions of stress, consisting of loud noise treatment, emotional stress, deprivation of paradoxical sleep, and swimming to exhaustion, respectively. The body weight was markedly decreased at the end of the respective experimental periods except with the loud noise treated group, compared with the corresponding controls. Following two to three such consecutive treatments, the adrenal weight also showed a significant increase. Thiamin diphosphate and total …

Effects Of Hydrocarbon Chain Length On The Thermodynamics Of Formation Of Bis(N-Alkylamino)-Silver (I) Complex Ions, Don J. Temer

Chemistry and Chemical Biology ETDs

As part of a comprehensive study of the thermodynamics of conformational changes of n-alkyl groups in aqueous solution, the equilibrium constants, enthalpy changes, and entropy changes have been measured for the stepwise formation of bis(n-alkylamino)silver(I) complex ions at 25° in dilute aqueous solution. The attachment of the charged Ag⁺ to the end of the amine molecule is thought to cause changes in the conformation of the n-alkyl chain. The effects of these conformational changes on the formation constants, enthalpy changes, and entropy changes of the Ag⁺ complexes are discussed and compared with the effects on the formation constants, …

Electron Optical Study Of A Secondary Electron Multiplier, Chang Min Shen

Dissertations and Theses

Electron orbital theory was applied to the design of the geometrical structure of an electron multiplier for an image intensifier. A special structure satisfying production requirements was studied. Electron optical calculations consisted of determining the potential distribution and tracing the electron trajectories. Liebmann's procedure was used to solve Laplace's equation with constant potentials on the multiplier electrodes as boundary conditions. The trajectories were determined by solving the equation of motion in an electrostatic field using a Runge-Kutta procedure. The initial conditions for the trajectories were the initial energies, initial positions, and the initial directions of the secondary electrons. The plotted …

Far-Infrared Properties Of Lattice Resonant Modes. Iv. Paraelectric Impurities, Roger D. Kirby, A.E. Hughes, A.J. Sievers

Roger Kirby Publications

We have studied the three paraelectric defect systems KCl: Li+, RbCl: Ag⁺, and NaCl: OH^- through the temperature dependence and electric field dependence of their far-infrared absorption spectra. It is found that the motional energy states for the defects in these three systems have many properties in common. In each case the impurity ion has an associated electric dipole moment and low-lying tunneling energy levels. The defects also have higher energy levels which can be attributed, at least in part, to c. m. resonant-mode motion. The KCl: Li+ tunneling levels are found to be well described by …

Terminal Talk - The Wofford Connection - July 1970, Wofford College Computer Center

Terminal Talk

No abstract provided.

Hellmann-Feynman Theorem In Thomas-Fermi And Related Theories, Jerry Goodisman

Chemistry - All Scholarship

The general Hellmann-Feynman theorem (derivative of energy with respect to a parameter = expectation value of derivative of Hamiltonian) is proved for theories in which the electron density is determined by making the energy functional stationary. Some simple applications are given.

Limited Resurrection Of The Born Approximation, Paul Finkler

Paul Finkler Papers

It is shown that the ordinary Born approximation for pn and pp̅ charge-exchange scattering correctly accounts for (1) the shape of the forward peak for 0 ≤ (-t) ≤ µ²/2 at P_L = 8 GeV/c, and (2) the energy dependence of the cross sections at t=0 in the energy range P_L,=2—8 GeV/c. This result is analogous to the well-known success of the electric Born approximation in Π⁺ photoproduction. It is then shown that the simplest interpretation of this surprising result within the framework of Regge-pole theory is in terms …

Photoionization Of Argon And Xenon Including Final-State Correlation, Anthony F. Starace

Anthony F. Starace Publications

Effects of final-state correlation on the photoionization cross sections for the 3p shell in argon and the 4d shell in xenon are calculated by the reaction-matrix method, starting from the Herman-Skillman model Hamiltonian, for photoelectron energies 0<~ε<~1.2 a.u. and 0<~ε<~2.52 a.u., respectively. The results for argon complement Hartree-Fock and other final-state correlation calculations; the results for xenon are the first ab initio calculations of this kind. Although length and velocity forms of the transition matrix element agree in the initial local-field approximation, they are shown to diverge necessarily when only the final state is improved.

Determination Of (N, 2n) Reaction Cross-Sections For 71ga, 106cd & 138ba Using 14 Mev Neutrons, Thomas Helm

Masters Theses & Specialist Projects

The increasing trend towards the use of activation analysis as an analytic means of identifying elements and determining their relative abundance demands more accurate values of reaction cross-sections. Accurate values of cross-sections are also important in the investigation of possible shell effects in reaction mechanisms. Many activation cross-sections for reactions produced by 14 MeV neutrons have been measured because of the relative ease with which this energy of neutrons can be produced. Low voltage accelerators are capable of producing 14. MeV neutrons by the ³H( d,n)⁴He reaction. Although many people^(1-5) have measured the (n,2n) reaction cross-sections …

Determination Of The Time Delay In The Arrival Of Jovian Signals At Opposite Ends Of A Long Baseline Fringe Synthesis Interferometer, Roger Scott

Masters Theses & Specialist Projects

In order to determine the size of the decametric sources, the technique of long baseline radio interferometry is being employed. The University of Florida at Gainesville is a pioneer in this field. In 1964, T. D. Carr introduced the procedure of recording the signals received at each end of an interferometer on magnetic tape and comparing the re-corded signals at a later time. This eliminated the necessity for transmission lines over the length of the baseline, allowing greater separation to attain higher resolution.

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

Mechanical & Aerospace Engineering Theses & Dissertations

No abstract.

Grain Size Reconnaissance Of The Virginia-North Carolina Inner Shelf Analysis By Settling Technique, Robert Bailey Sanford Jr.

OES Theses and Dissertations

The 2-fold purpose of this study is to calibrate a Rapid Sediment Analyzer and to use it to aid in the determination of the genesis of sediment on the inner continental shelf between Cape Henry and Cape Hatteras. Rapid Sediment Analyzer calibration was conducted by comparison of sieving and settling results of similar sands.

The study area was divided into sediment provinces by both a qualitative procedure (grain size and topography) and a quantitatively procedure (factor-vector analysis). Qualitative provinces are beach and surf, upper shore face, lower shore face, sea floor, and terminal shoals. The berm fines from each terminal …

Erasure Of Sediment Surface Features By Mellita Quinquiesperforata (Leske), Walter Richard Boehmer

OES Theses and Dissertations

Erasure of sediment surface features by individuals of the species, Mellita guinguiesperforata, observed in this study suggests that all members of the sub-order, Scutellina, are able to erase sediment surface features. Sweep time, the time needed to erase the surface features of an area, depends on the population density, individual size, and speed of movement of the sand dollars. Assuming their pattern of movement as random, the following equation can be used to determine sand dollar sweep time,

T - 3.2 N^-0.76 (W / S) (A/ W² )^1.21

where T is sweep time, N is the …

A Spectroscopic Investigation Of Electron Transfer Transitions In Osmium (Ii) Complexes., Brian J. Pankuch

Chemistry and Chemical Biology ETDs

Osmium (II) complexes containing organic coordinating ligands 2.2'-bipyridine, 1.10-phenanthroline, 2.2' .2"­terpyridine were studied spectroscopically. Syntheses were carried out by published methods, and each complex was checked by chemical analysis and thin layer chromatography. The complexes were shown to be d6 strong field systems by magnetic susceptibility measurements performed at room temperature in air.

Room temperature absorption spectra in the visible and near-ultraviolet were measured in solvents of different polarities (H₂O, MeOH, CH₃CN, DMF, CHCl₃) and solvent shifts of the band maxima of 0.3 to 3 kK were found. Low temperature (approximately 82-90°K) absorption spectra …

Statistics For Decision Making, Central Bank Of Nigeria Cbn

Economic and Financial Review

The paper was reproduced for the Board of Trade Journal No 3783 of September 17, 1969. It was a speech from the Prime Minister on the need to for a change from the traditional system of industrial statistics to a more comprehensive scheme of quarterly reporting of production which will be supported by annual inquiries into such matters as purchases, fixed capital formation among others.

Statistical Section (June 1970), Central Bank Of Nigeria Cbn

Economic and Financial Review

The dataset include data for central bank and commercial banks statement of assets and liabilities, currency in circulation, external assets, international trade, money and capital markets, money supply, national savings, production, public debt and public finance.

Water Resources News, Volume 2, No. 6, June-July 1970

Water Current Newsletter

OWRR Title II Proposals Invited
Studies of Brine Water Disposal
Sediment Pollution from Road Building to be Controlled
Graduate Studies in Water Resources
University of Nebraska Water Resources Planning and Management Program Approved
Research Needed on Oil Pollution Source Identification
Third Outdoor Recreation Research Catalog Announced
Cost Study Shows Need for Increased Municipal Spending for Water Pollution Control
National Conference on Environmental Pollution
Canadian Water Sales May Become Reality
$344,000 Contract Awarded Gillette Research by FWQA to Develop Phosphate-Free Detergents
Meeting "Challenge of the Environment" is Corps of Engineers' Greatest Challenge
Sand Hills is Test Ground This Summer
NWRRI Annual …

Quantitative Spark-Source Mass Spectrometric Techniques For The Simultaneous Determination Of The Lanthanide And Actinide Elements In Microgram And Sub-Microgram Transuranium Samples, Joel Avery Carter

Doctoral Dissertations

The work presented encompasses techniques developed for the analysis of certain rare earth and actinide elements in solutions containing highly radioactive transuranium elements. Advantage was taken of the high inherent resolution and sensitivity of the rf spark-source mass spectrometer in the development of qualitative and quantitative procedures where an analysis can be made on a total sample of <1 to 10 μg. Parameters for the Associated Electrical Industries' MS-702 spark-source mass spectrometer were adjusted so that mass-to-charge ratios in the range of 10 to 310 could be subjected to qualitative analysis. For quantitative assessment of impurities in a transuranium solution, relative sensitivity factors were established with respect to erbium, the internal standard, for rare earth elements and for thorium, uranium, neptunium, americium, curium, berkelium, and californium.

A special glove box was designed, fabricated, and used on the source end of the mass spectrometer so that samples of the transuranium elements could be run safely. Transuranium element with α-emitting radioactivity up to 10¹⁰ dpm were processed through the …

Analytic Approach To Electron Correlation In Atoms, Ronald White, Frank Stillinger

Center for Advanced Mineral and Metallurgical Processing (CAMP)

A novel perturbative treatment of electron correlation in N‐electron atoms is devised. The unperturbed starting point is a central‐force “hydrogenic” problem in the full dN‐dimensional configuration space (d = dimensionality). The central potential in this solvable “hydrogenic” problem is obtained by averaging the actual electron–electron and electron–nucleus potentials over all dN − 1dN − 1 hyperspherical polar angles in the configuration space. The relevant projected Green's functions are computed for the ground states of the model one‐dimensional two‐electron atom (with delta function interactions), as well as for the real three‐dimensional helium isoelectronic sequence. The corresponding first‐order wavefunctions exhibit weakly singular …

A Preliminary Survey Of The Damariscotta River Estuary, Lincoln County, Maine, Maine Department Of Economic Development

Maine Collection

A Preliminary Survey of the Damariscotta River Estuary, Lincoln County, Maine

Part I - Hydrology; Part II - Sediments

"Prepared Under a Grant From the Maine Marine Stipend Program".

Maine Department of Economic Development - Division of Science, Technology & Mineral Resources, Augusta, Maine (July 1969 - June 1970).

Halogenated Helicenes, Richard Wilbert Heiden

Honors Theses

Attempts at synthesizing certain halohelicenes for studies in the following areas are described: 1) the testing of a new method of resolving 2) electron spin resonance (ESR). Since the purpose of the study was twofold, the decision to synthesize monochloro derivatives of hexahelicene was based on the time element and the comparative ease in which these particular compounds were thought to have been brought about (i.e. in direct comparison to polyhalo and higher order helicenes). In addition to the traditional historical, theoretical, and experimental sections, an appendix contained a few suggestions relative to helicene research is included.

Calculations Of Total Energies For Neon Atom, Argon Atom And Neon Ion, Joseph Patrick Minehan

Honors Theses

This work shows that is is very difficult to guess the proper configuration of the spheres for most atoms. This is clearly shown in the argon calculations, where Bent suggested a configuration that would have lowest energy, but it turned out to have the highest energy of those calculated. This shows the need to have a method to give the configuration of the lowest energy that depends very little on human insight.

Synthetic Approaches To Tris (1-B, 8-B'-Naphthyl) Diboron, William Karl Goerich

Honors Theses

The purpose of this project was the synthesis of tris(l-B, 8-B'­naphthyl)diboron. The synthesis route attempted was the preparation of 1,8-dibromonaphthalene from 1,8-diaminonaphthalene by tetrazotization followed by a Sandmeyer reaction, treatment of the dibromo compound with n-butyllithium to give 1,8-dilithionaphthalene and subsequent addition of boron trifluoride to give the product.

Synthesis Of N-Methyl-N-Phenylaminomethyltrimethylsilane And N, N-Dimethylanilinomethyltrimethylsilyl Iodide, Mark Stuart Lichtenstein

Honors Theses

N-Methyl-N-Phenylaminomethyltrimethylsilane (I) has been prepared by heating an ethereal solution of lithium N-Methyl-anilide and chloromethyltrimethylsilane in a sealed flask for two days at 110°. The peak ratios in the NMR spectrum of the product did not correspond to these expected for I but suggested a different product, N-Methyl-N-Trimethylsilylaniline (II). Elemental analysis favored II although it could also be interpreted to support I. The spectra of derivatives, and the substance’s stability to hydrochloric acid were characteristic of I. Tentative identification of ethylene as a by-product, and a small degree of reaction with hydrochloric acid support the presence of II, but only …

High Pressure Spectral Chemistry Of Selected Organic Compounds, Frank William Linsley

Theses and Dissertations

The series of compounds indicated by the formular C_6H_5-(CH=CH)n-C_6H_5 change in color from white (colorless) to yellow to orange to red to deep red as n increases from 1 to 12. Stilbene is the first compound of this series (n=1). Under pressure, exerted by a diamond anvil press, stilbene can be seen to change color from white to yellow to red as increasing pressure is applied. Similar color changes are observed for the compounds where n=2,3, and 4 when subjected to similar pressure. This study records and reports the spectra versus pressure for these compounds.

The Prairie Naturalist Volume 2, No.2 June, 1970

The Prairie Naturalist

EDITORIAL: Ecocide on the Sheyenne? ▪ Paul B. Kannowski

NEW RECORDS OF VASCULAR PLANTS IN NORTH DAKOTA ▪ Robert E. Stewart

SOME LOCAL NATIVE PLANT LOSSES AND SOME SAL V AGE ▪ O. A. Stevens

CHRISTMAS BIRD COUNTS IN NORTH DAKOTA ▪ Robert N. Randall

ENVIRONMENTAL DESIGN IN COMMUNITY PLANNING ▪ Cameron Man

DISTRIBUTION OF THE SCIRPUS VALIDUS COMPLEX IN NORTH DAKOTA ▪ Richard L. Ward