Physical Sciences and Mathematics Commons^™

Perturbation Theory In A Strong-Interaction Regime With Application To 4d-Subshell Spectra Of Ba And La, Göran Wendin, Anthony F. Starace

Anthony F. Starace Publications

We investigate the behavior of a bound electron–hole excitation in an energy region where the response of the system is highly resonant and shows strong collective behavior. Formulae for calculating discrete energy levels and wavefunctions are presented for the case where the perturbation is strong enough to change the nodal structure of the perturbed wavefunctions relative to that of the unperturbed wavefunctions. This change in nodal structure requires a renaming of the associated atomic states. Neglect of such renaming is shown to have been at the root of a recent controversy between differing interpretations, based on alternative calculational procedures, of …

Vibrational And Rotational State Dependence Of Dissociative Attachment In E-H2 Collisions, J. M. Wadehra, J. N. Bardsley

Physics and Astronomy Faculty Research Publications

Resonant scattering theory is applied to the calculation of e-H2 dissociative attachment cross sections near threshold for several vibrational and rotational states of the H2 molecule. Typical values just above threshold are, in cm2, 2.8×10−21 for the ground state (v=0, J=0), 8.3×10−20 for (1, 0), 1.0×10−18 for (2, 0), and 3.5×10−20 for (0, 10). The effect of rotational excitation is found to be significant, although it is not as large as suggested by Chen and Peacher.

Non-Professional Scuba Training Fatalities In The United States (1970-1976), Peter Redmayne

Theses and Major Papers

From 1970 to 1976 ninety seven fatalities occurred during scuba diving training courses taught by nationally recognized scuba certification agencies. Data from these fatalities was gathered and analyzed at the University of Rhode Island's National Underwater Accident Data Center (NUADC) from September 1977 to June 1978. After analysis of each case and compilation of data for the statistical tables, an effort was made to look for specific trends that occurred over the course of the period investigated. In the course of analysis it became evident that a high percentage of training facilities occurred to students who were diving in less …

Diffusion Of Nickel In Silicon Below 475 °C, G. L.P. Berning, L. L. Levenson

Physics Faculty Research & Creative Works

Nickel films were deposited on (100) and (111) surfaces of single-crystal silicon and were then annealed. The conditions under which the nickel is deposited determine whether or not an NiSi compound forms on annealing. It is postulated that defects are necessary for the formation of an NiSi compound at annealing temperatures below at least 475 °C, although the presence of defects may not necessarily cause the formation of a silicide. For substrate temperatures below 70 °C, defects are created during the vapor deposition of nickel on silicon. These defects always result in the formation of nickel silicide when the sample …

Bulk Composition, Mineralogy, And Petrology Of Chondrules In Type H3 To H6 Chondrites, Gayle Elizabeth Lux

Earth and Planetary Sciences ETDs

Chondrules in thin' sections of 18 different H3 to H6 group chondrites were analyzed by 100 µm broad beam electron probe techniques. Chondrule textures, crystal, and chondrule sizes were determined microscopically. Results indicate a decrease in variance or standard deviation from chondrules of petrologic types 3 to 6 of FeO, MgO, TiO₂, MnO, K₂O, and P₂0₅ content. Mean TiO₂ and Cr₂O₃ content decrease from petrologic types 3 to 6 and mean FeO, Al₂O₃, CaO, and Na₂O increase slightly from lower to higher petrologic …

Geology And Mineralogy Of Cave Nitrates, Carol A. Hill

Earth and Planetary Sciences ETDs

ABSTRACT

Southeastern saltpeter caves have temperatures between 10-15° C and humidities between 90-99%. Saltpeter sediments are alkaline (pH= 6-9), dry and porous (moisture = 5-10 wt. %) and non-organic (low levels of compost, guano and animal remains); sediments have nitrate concentrations ranging between 0.01-4.0 wt. %, low total nitrogen (0.08-0.13 wt. %) and relatively low phosphorous (0.1-1.4 wt. %). Lixiviated cave sediments regenerate in nitrate in several years. Areal extent of cave nitrate is uniform; vertical concentration is in the top few meters of sediment. Nitrate is a minor constituent in sulfate speleothems (up to 1 wt. %). Surface and …

The Prairie Naturalist Volume 10, Number 4. December 1978

The Prairie Naturalist

THE ORNITHOGEOGRAPHY OF THE GREAT PLAINS STATES ▪ Paul A. Johnsgard

CAPTURE OF GRAY PARTRIDGE BY FALCONRY IN NORTH DAKOTA ▪ John W. Schulz

INCUBATION RHYTHMS AND EGG TEMPERATURES OF AN AMERICAN GREEN-WINGED TEAL AND A RENESTING PINTAIL ▪ Alan D. Afton

TEMPORAL PATTERNS OF SPRING MIGRATION OF YELLOW-HEADED BLACKBIRDS IN NORTH DAKOTA ▪ Richard D. Crawford

CHECKLIST OF NORTH DAKOTA MAMMALS: COMMENTS ON STATUS AND DISTRIBUTION OF SPECIES ▪ Robert W. Seabloom

NOTE

First Nesting Record of Cattle Egret and Little Blue Heron in North Dakota ▪ Lloyd A. Jones

BOOK REVIEWS

Geese of the World ▪ Carl E. …

Lichenometric Distribution Of Rhizocarpon Geographicum On Mt. Washington: A Relative Dating Tool., Paul Andrew Mayewski, Peter A. Jeschke

Earth Science Faculty Scholarship

Excerpt from summary, p. 83: In addition to marking the distribution of snowpatches and the relative age of patterned ground features, local departures from the regional lichenometric trend may also be used to define and relatively date: changes in the distribution of soils and vegetation, avalanche deposits, and abrasion of hiking trails. Lichenometric studies will be undertaken in the following year to date more precisely features and events on Mount Washington.

High-Flux Beam Source Of Fast Neutral Helium, D. W. Fahey, Laird D. Schearer, William F. Parks

Physics Faculty Research & Creative Works

A high-flux beam source of fast neutral helium has been constructed by extending the designs of previous authors. The source is a dc or pulsed electric discharge in an expanding gas nozzle. The beam produced has a flux on the order of 1015 atoms/ssr and a mean velocity on the order of 107 cm/s. The composition of the beam has been determined by the use of particle detectors and by the observation of the excitation of certain target gases. An upper bound of 3.7*10-5 has been estimated for the He(2 3S1)/He(1S0) beam density ratio and a value of 0.2 found …

Volume 2, Number 12 (December 1978), The Otec Liaison

The OTEC Liaison

No abstract provided.

Principal Angle, Principal Azimuth, And Principal-Angle Ellipsometry Of Film-Substrate Systems, R. M.A. Azzam, A.-R. M. Zaghloul

Electrical Engineering Faculty Publications

When the film thickness is considered as a parameter, a system composed of a transparent film on an absorbing substrate (in a transparent ambient) is characterized by a range of principal angle ø¯_min ≤ ø¯ ≤ ø¯_max over which the associated principal azimuth ψ¯ varies between 0° and 90° (i.e., 0° ≤ ψ¯ ≤ 90°) and the reflection phase difference Δ assumes either one of the two values: +π/2 or −π/2. We determine the principal angle ø¯(d) and principal azimuth ψ¯(d) as functions of film thickness d for the vacuum-SiO₂-Si system at …

Propagation Of Partially Polarized Light Through Anisotropic Media With Or Without Depolarization: A Differential 4 × 4 Matrix Calculus, R. M.A. Azzam

Electrical Engineering Faculty Publications

We extend the scope of the Mueller calculus to parallel that established by Jones for his calculus. We find that the Stokes vector S of a light beam that propagates through a linear depolarizing anisotropic medium obeys the first-order linear differential equation dS/dz = mS, where z is the distance traveled along the direction of propagation and m is a 4 × 4 real matrix that summarizes the optical properties of the medium which influence the Stokes vector. We determine the differential matrix m for eight basic types of optical behavior, find its form for the most general anisotropic nondepolarizing …

Historical Development Of Computer Science At Purdue University, S. D. Conte

Department of Computer Science Technical Reports

No abstract provided.

Crystalline To Amorphous Transformation In Ion-Implanted Silicon: A Composite Model, John R. Dennis, Edward Boyd Hale

Physics Faculty Research & Creative Works

The transformation of silicon to the amorphous state by implanted ions was studied both experimentally and theoretically. Experimentally, the amount of transformed silicon and the critical ion dose necessary to amorphized the entire implanted layer were determined by ESR. How the critical dose varies with ion mass (Li, N, Ne, Ar, and Kr), ion energy (20-180 keV), and implant temperature (77-475 K) was determined. Theoretically, several phenomenological models were used to analyze these data. The overlap-damage model was used to determine the critical dose from the data, the size of the amorphous region around the ion track, and the degree …

Monroe, Utah,Hydrothermal System: Results From Drilling O F Test Wells Mc 1 And Mc 2, D. S. Chapman, Roger Harrison

All U.S. Government Documents (Utah Regional Depository)

Following detailed geological (Parry et al., 1976; Miller, 1976) and geophysical (Mase, Chapman, and Ward, 1978; Kilty, Mase, and Chapman, 1978) studies of the Monroe, Utah hydrothermal system, a program of drilling two intermediate depth test wells was undertaken. The objectives of the test well drilling were three-fold: (1) to obtain structural information bearing on the poorly know dip of the Sevier Fault, (2) to obtain temperature information below the shallow depths (approximately 300 ft.) sampled in the first phase of exploration, and (3) to provide cased wells during the production phase of the project. The test well drilling was …

Groundwater Levels In Nebraska, 1977, Michael J. Ellis, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.

A Computer Simulation Study Of Seven Pairwise Comparison Procedures: Imbalanced Case, Wayne S. Petroelje

Dissertations

No abstract provided.

Electron Transfer Reactions Of An Osmium (Ii) Polypyridyl Complex With Oxidizing Agents, Stephen Mcclanahan

Masters Theses & Specialist Projects

Redox rates between polypyridyl osmium (II) complex, OsCl(py)₃(bipy)⁺, with tris(1,10-phenanthroline) cobalt (III), Co(phen)₃³⁺, and Ce(IV) were examined in aqueous solution. Both reaction systems exhibited second order kinetics. The osmium (II) - cobalt (III) redox reaction was found to have a rate constant of 2.3 x 10⁵ M^-1 sec^-1 at 22°C and µ = 0.003M from which the isotopic electronic exchange rate constant for the OsCl(py)₃(bipy)^+/2+ system was estimated to be 1.5 x 10⁹ M^-1sec^-1.

Ionic strength effects on the Ce(IV) - Os(II) …

Nmr Instrumentation With Solid State Devices, Syed M. Ahmed

Masters Theses

No abstract provided.

A Feasibility Study Concerning The Use Of Alternate Energy Sources In Taiwan, Li-Juan Lee

Masters Theses

No abstract provided.

An Investigation Of Montmort's "Probleme De Recontres" And Generalizations, Ronald I. Greenberg

Computer Science: Faculty Publications and Other Works

I have investigated a problem which may be phrased in many ways, such as finding the probability of answering a given number of questions correctly on a randomly-completed matching test which may have a number of extra "dud" answers. I have determined such probabilities, the average number of correct answers, and other allied results. I have also investigated a related problem involving the number of ways of choosing a different element from each of a certain collection of sets.

Role Of Low-Energy Two-Body Virtual States In Three-Particle Scattering Situations, James A. Lock

Physics Faculty Publications

A model three-particle scattering situation consisting of a projectile incident on a target bound to a residual core was considered under the assumptions that there was a low-energy virtual state in the projectile-target channel, that the projectile and core did not interact, and that the projectile-target and target-core interactions were s-wave separable interactions. When the appropriate Faddeev equations were solved by inversion, an enhancement was found in the three-body elastic cross section for virtual state energies less than or comparable to the target-core binding energy. This enhancement was determined to be kinematical in origin.

Electron Attachment In Dilute Fluorine-Helium Mixtures, Kaare J. Nygaard, Scott R. Hunter, John L. Fletcher, Stephen R. Foltyn

Physics Faculty Research & Creative Works

We have made an absolute determination of the electron attachment coefficient η (cm-1) in helium containing 0.1-1% fluorine covering an E/N range from 3Td-17Td. At an estimated average energy of 5 eV we find a rate coefficient equal to (7.5±1.5) x10-10 cm3/sec.

Photochemistry Of Heteroaromatic Analogs Of Β-Methyl-Β-Nitrostyrene, Dale Willis

Masters Theses & Specialist Projects

2-(2-nitropropenyl)thionhene, 2-(2-nitropropenyl) pyrrole, and 2-(2-nitropropenyl) furan were prepared and irradiated in undenatured 95% ethanol and 2% aqueous acetone. The pyrrole derivative was found to undergo a slow photodecomposition to tars. The thiophene derivative produced 60% of an α-oximino ketone and 30% of an oxazine cyclization product when irradiated In ethanol. When irradiated in acetone 47% of the oxime was produced in addition to 7% of the oxazlne. The furan derivative produced 12% of an α-oximino ketone and 51% of an oxazine cyclization product when irradiated in ethanol. When irradiated in acetone 15% of the oxime and 32% of the oxazine …

Spectroscopic Study Of Ni(Ii)-4, 4’, 4’’, 4’ ’’ – Tetrasulfophthalocyanine In Aqueous Solution, Issa Ishaq Jabra

Masters Theses & Specialist Projects

It was determined spectrally that a monomer-dimer equilibrium exists in aqueous solutions of Ni-TSPC^4- over a concentration range of 5 x 10^-8 – 10^-4 M. Equilibrium measurements were made under natural ionic strength conditions at 29°, 39° and 49°C. The values obtained for the equilibrium constants at 29°, 39° and 49°C were 2.4 x 10⁸, 6.6 x 10⁷ and 2.9 x 10⁷ M^-1, respectively. These results indicated that the equilibrium strongly favors dimer formation. This study also showed that nickel is second to copper in enhancing the dimerization of metallotetrasulfophthalocyanine complexes. …

Emission Of Microbial Aerosols From Polluted Waters In Densely Populated Regions, Lois S. Cronholm

KWRRI Research Reports

The air surrounding three activated sludge tanks was sampled over a two year period for the emission of bacterial aerosols under a variety of climatic conditions and at varying distances upwind and downwind of the aerated tanks. All plants emitted species of enteric bacteria which are significant as index organisms and as frank pathogens. The emission pattern of these bacteria were influenced by distance from the plant and wind direction. Within the parameters of a plant, defined arbitrarily in this study by sampling sites less than 150 m upwind and less than 900 m downwind, distance from the source was …

Petrology And Structure Of Precambrian Rocks In The Bosque Peak Quadrangle, North Manzano Mountains, Central New Mexico, Duncan L. Edwards

Earth and Planetary Sciences ETDs

Precambrian metamorphic rocks in a part of the North Manzano Mountains, New Mexico, underwent regional synkinematic greenschist facies metamorphism. Abundant green hornblende in greenstones and muscovite, chlorite, and biotite in metapelites tentatively suggest p4 kb and TC during metamorphism. The greenstones were probably derived from basic volcanic rocks; the metapelites were probably derived from shales, siltstones, clay-rich sandstones, cherts (7), and mature quartz sandstones.

The oldest exposed rocks are the Moyos metasediments, a sequence of phyllites and schistose grits that is lithologically transitional to a younger greenstone complex of mostly aphanitic greenstone with intercalated phyllites and metasiltstones and intrusive metadiorite. …

Scs 49: A Review Of A Theorem Of Dixmier's, Karl Heinrich Hofmann, Fred Watkins

Seminar on Continuity in Semilattices

No abstract provided.

Scs 48: Projective Limits In Cl And Scott's Construction (Comp. Iii-3), Karl Heinrich Hofmann, Jaime Niño

Seminar on Continuity in Semilattices

No abstract provided.

Chemical Vapor Deposited Amorphous Silicon For Use In Photothermal Conversion, David D. Allred, D. C. Booth, M. Janai, G. Weiser, B. O. Seraphin

Faculty Publications

Efficient photothermal conversion requires surfaces of high solar absorptance and low thermal emittance. This can be accomplished by the tandem action of a good infrared reflector overlaid by a film of sufficient solar absorptance that is transparent in the infrared. Crystalline silicon is a suitable candidate for the absorber layer. Its indirect band gap, however, results in a shallow absorption edge that extends to far into the visible. In contrast, the absorption edge of amorphous silicon is steeper and located farther into the infrared, resulting in a larger solar absorptance. We report on the fabrication of amorphous silicon absorbers by …