Physical Sciences and Mathematics Commons^™

Negative Ion Production Rates In Rare Gas-Halide Lasers, Kaare J. Nygaard, Howard L. Brooks, Scott R. Hunter

Physics Faculty Research & Creative Works

This paper reports on dissociative electron attachment in F2, NF3, Cl2, and I2. The principle of the method is to produce a short burst of photoelectrons from a photocathode by means of light from an argon-fluoride laser. Subsequently, by studying the motion of electrons and negative ions in a constant electric field (E) region, information is obtained about drift velocities and effective attachment cross sections. Helium, argon, and nitrogen were used as buffer gases. Of particular interest is a very strong temperature dependence of the attachment coefficient in I2. Measurements were taken from 35 to 110°C, covering an E/N range …

Precision Doubly Differential Cross Section Measurements, John T. Park

Physics Faculty Research & Creative Works

Ion Energy Loss Spectrometry has been applied to the measurement of cross sections differential in both scattering angle and ion energy loss. Differential cross sections obtained for excitation of the n=2 level of atomic hydrogen by various ions provides unexpectedly good agreement with the available theories. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.

Nucleation Experiments With Monodisperse Nacl Aerosols., Darryl J. Alofs, M. B. Trueblood, D. R. White, V. L. Behr

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Nucleation Experiments with Monodisperse NaCl Aerosols Showed Good Agreement with the Kohler Theory Relating the Critical Super-Saturation S//c to the Dry Size. Aerosols Produced by Condensing NaCl Showed the Same S//c as Those Produced by Evaporating Aqueous NaCl Solution Droplets. This Indicates that If There is an Energy Barrier in Going from a Dry NaCl Particle to a Solution Droplet, This Energy Barrier is Small. the Fact that the Evaporation Aerosol Particles Are Cubical Crystals and the Condensation Aerosols Are Amorphous Spheres is Shown to Make No Difference in the Nucleation Threshold. the Investigation Also Gives Insights into the Performance …

Temperature Dependence Of The Electron Attachment Coefficient In Iodine, Howard L. Brooks, Scott R. Hunter, Kaare J. Nygaard

Physics Faculty Research & Creative Works

The attachment coefficient for iodine in a (1% I2+99% N 2) mixture, 50 Torr total pressure, has been measured in an electron swarm experiment from 1 to 50 Townsends (1 Townsend=1Td=10-17 V cm2). As the temperature was increased from 35 to 110°C, the attachment coefficient increased for any E/N (electric field intensity/gas number density) values greater than 7 Td. These results are compared to other experimental data and an explanation for the temperature dependence, based on the population of upper vibrational states, is presented. © 1979 American Institute of Physics.

A Mechanism For Specifying Parallel Procedures, James Oliver Smith Jr.

Masters Theses

"This thesis presents a mechanism that will provide a semantic and syntactic environment for expressing parallel procedures. This mechanism will be referred to as the Parallel Machine. The parallelism of the Parallel Machine is accomplished through an arbitrary number of specialized computing elements that each implement a single command called a Simultaneous Command. Each Simultaneous Command is capable of determining the occasions for its action by observing conditions within the Parallel Machine. There is no restriction on the number of Simultaneous Commands that can be defined or be simultaneously active. Within a parallel procedure expressed as a set of Simultaneous …

Plasma Polymerization Of Tetrafluoroethylene. Iii. Capacitive Audio Frequency (10 Khz) And Ac Discharge, N. (Nicholas) C. Morosoff, H. Yasuda, E. S. Brandt, C. N. Reilley

Chemical and Biochemical Engineering Faculty Research & Creative Works

The plasma polymerization of tetrafluoroethylene (TFE) is studied in a capacitively coupled system with internal electrodes using a 10 kHz (af) and a 60 Hz (ac) source. The emphasis is on identifying conditions that are compatible with continuous coating of plasma polymer on a substrate moving through the center of the interelectrode gap. Operation at a pressure below 100 mTorr is most favorable for deposition of a substantial portion of the plasma polymer on this substrate. Plasma polymer deposited in this way is characterized by ESCA and by deposition rate data and compared to that deposited using rf power in …

A Graded Bibliography On Macro Systems And Extensible Languages, John R. Metzner

Computer Science Faculty Research & Creative Works

No abstract provided.

Cndo Calculations On The Structure Of A Liquid Sodium Carboxylate-Carboxylic Acid Compound, Beverly Bendiksen, Stig Friberg, Patricia L.M. Plummer

Chemistry Faculty Research & Creative Works

The molecular interactions in a carboxylic acid/sodium carboxylate compound which is a liquid at room temperature were calculated using a CNDO/2 approach. The calculations gave results distinguishing the energy for different conformations in the molecular compound. The maximum binding energy was found for a structure in which the four acids were bridging with a hydrogen bond from the acid OH group to the carboxylate group and the acid carbonyl groups forming a ligand bond to the carboxylate sodium ion. © 1979 Academic Press, Inc.

A Simple Experiment Illustrating The Structure Of Association Colloids, Stig Friberg, Beverly Bendiksen

Chemistry Faculty Research & Creative Works

No abstract provided.

Plasma Polymerization Of Tetrafluoroethylene. Ii. Capacitive Radio Frequency Discharge, N. (Nicholas) C. Morosoff, H. Yasuda, E. S. Brandt, C. N. Reilley

Chemical and Biochemical Engineering Faculty Research & Creative Works

The plasma polymerization of tetrafluoroethylene (TFE) is studied in a capacitively coupled system with internal electrodes using radio frequency (13.56 MHz) power. The emphasis is on identifying conditions that are compatible with continuous coating of plasma polymer on a substrate moving through the center of the interelectrode gap. At high pressure (500 mTorr), deposition of plasma polymer is primarily on the electrodes rather than on a substrate placed midway between electrodes. Glow is observed in only part of the interelectrode gap at low powers and fills the gap only at high power levels. The use of a magnetic field effects …

Excitation Of Cd, Zn, And Sr By A Beam Of Active Nitrogen, D. W. Fahey, William F. Parks, Laird D. Schearer

Physics Faculty Research & Creative Works

Excitation of the electronic levels of Cd, Zn, and Sr is observed when these metal vapors collide with a thermal-energy, active nitrogen beam. The beam is extracted from a glow discharge in pure N2. The active beam component is inferred to be vibrationally excited N2 in the A 3Σu+ electronic state. The absolute relative intensity of the emission lines in each element was measured. The excitation rates of the Cd and Zn target levels were found to depend exponentially on their energies indicating an effective temperature of approximately 4000°K. We believe that this temperature is related to the vibrational temperature …

Geology And Mineralization, Ohio And Mt. Baldy Districts, Marysvale, Piute County, Utah, Laurence M. Nuelle

Masters Theses

"The Ohio and Mt. Baldy Mining Districts near Marysvale, Utah occupy a cauldron complex in the Bullion Canyon Volcanics. This complex contains three rock groups of three volcanic episodes. The oldest is a volcanic cone framework series of lahars. The middle group is represented by lava flows, ash flows, and breccias which represent intra-caldera fill. The upper group consists of a local vent complex and the Delano Peak Tuff Member both of which may be related to ring fracture activity.

The stages of veining in the area include in order of gradational deposition: (1) early quartz veins, (2) pre-productive main …

Plasma Polymerization Of Tetrafluoroethylene. I. Inductive Radio Frequency Discharge, H. Yasuda, N. Morosoff, E. S. Brandt, C. N. Reilley

Chemistry Faculty Research & Creative Works

The plasma polymerization of tetrafluoroethylene in an inductively coupled radio frequency glow discharge, using a flow system, was studied. A simple long tube reactor, with the coupling coil placed at the middle of the tube and gas entrance and exit at the respective ends, was used. Deposition rates and the chemical nature of the polymer (as revealed by ESCA spectra and surface energy studies) are obtained as a function of location in the reactor tube with respect to the coupling coil and of applied energy per unit mass of tetrafluoroethylene (W/FM). It was found that a fluorine poor polymer, containing …

Negative Ion Charge Transfer Of The Reaction Of S⁻ And O⁻ With Atomic Hydrogen Producing H⁻ Ions From 1500 To 10 Kev, George F. Hagner

Doctoral Dissertations

"The charge transfer reactions of 0^-, S^- with atomic hydrogen were studied from 1.5 to 10 KeV, and the reaction Cl^- + O₂ + O₂^- + Cl was studied from 10 eV to 10 KeV. The reactions studied were normalized to the reaction H^- + H + H + H^-. The maximum measured cross sections were 4.6 x 10^-16 cm² for the reaction Cl^- + O₂ + O₂^- + Cl and 4.4 x 10^-15 cm² for the reaction 0^- + H …

Alignment Of Ions In Penning Collisions, D. W. Fahey, Laird D. Schearer, William F. Parks

Physics Faculty Research & Creative Works

The authors have observed the alignment of the 5p P322 state of strontium ions produced in Penning collisions between an unpolarized beam of helium metastable atoms and a strontium vapor target. The alignment is shown by a linear polarization of the optical emission from the excited ion. For a 66-meV beam of helium metastable atoms a 3.5% linear polarization of the emission relative to the beam axis was measured. It is shown how the alignment may be used to determine the probabilities for populating the various final Quasi molecular states of the ion-atom pair. The alignment of the Penning ions …

The Oguchi-Kaneyoshi Method For Spin-Glasses, M. Jursich, Harry A. Brown

Physics Faculty Research & Creative Works

The results of an effective field calculation of the phase diagram and order parameters for a random exchange Ising model are presented. This calculation was based on an exchange coupled pair instead of the single-spin molecular-field theory. This approach should be an improvement over the infinite-ranged models because it includes localized effects. The results indicate that the local disorder effects are especially important at low temperatures. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

Nonlinear Anelasticity And The Martensitic Transformation, Manfred Wuttig, Tetsuro Suzuki

Materials Science and Engineering Faculty Research & Creative Works

Zener's model of a standard linear solid is extended to include nonlinearities characteristic of metals and alloys in the vicinity of a martensitic transformation. The equation of motion of a nonlinear anelastic solid is derived and solved using van der Pol's method. The characteristics of the solutions indicate that auto-oscillations of finite amplitude can be excited externally. It is proposed that the streaming oscillations represent the beat between the external excitation and the auto-oscillation. © 1979.

Heavy Metal Patterns In Big And Aux Vases River Drainage Rolla 1⁰ X 2⁰ Quadrangle, Missouri, Behzad Afzali

Masters Theses

"Some 71 active stream sediment, bank sediment, biota, and stream water samples were collected at selected sites along the Big River and Aux Vases rivers and tributaries. The pH, alkalinity, specific conductance, temperature were determined and samples analyzed for Cu, Pb, Zn, Co, Ni, and Cd content.

Stream waters carry heavy metals in low parts per billion. Greatest heavy metal content is in the stream waters of Flat River and lower Big River.

Acid leachable heavy metal content of -80 mesh fractions of stream sediments for Cu, Pb, Zn, Co, Ni, and Cd are orders of magnitude greater than that …

I. Extracellular Metabolites From Coprinus Macrorhizus Microsporus. Isolation And Characterization Of Hydroxylagopodin B. Ii. The Cell Wall Composition And Structure Of Coprinus Macrorhizus Microsporus, Carey Bernard Bottom

Doctoral Dissertations

“A purple pigment excreted into the culture medium of a mutant strain of the basidiomycete, Coprinus macrorhizus var. microsporus (ATCC 34960) has been isolated and characterized as hydroxylagopodin B based on ultraviolet, infrared, and mass spectral data. A wild-type strain of C. macrorhizus microsporus does not produce the purple pigment, however it does produce lagopodin B which is yellow in solution. Identification of lagopodin B was based on its melting point, the purple color of its alkaline solution, the mass spectrum, and mobility equivalence with a standard by thin-layer chromatography. The production of hydroxylagopodin B in the mutant strain is …

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 …

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.

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 …

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 …

The Effect Of Crude Oil Prices On The Output Composition Of Refined Petroleum Products, Angelos Pagoulatos, David L. Debertin, Emilio Pagoulatos

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In this study the crude petroleum market is linked to the market of refined petroleum products through a set of technological relationships. An econometric study is used to quantify the existing relevant variables. The price equations for each refined product are used to derive estimates of elasticities with respect to quantity supplied, price of domestic crude oil and price of imports.

Low Btu Producer Gas -- A Fuel Of The Past And A Fuel Of The Future, Lee Carter

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

A prime purpose of this paper is to give conscious emphasis to an important type of coal gasification, one that does not demand hundreds of millions of dollars to launch an experimental program but instead is essentially ready to use after a reasonable and straightforward engineering check-out of the local coal sources and the prospective gas demand.

That type of coal gasification results in low Btu producer gas. This paper deals with its history, its technology and its economics. In the light of that information, the future of low Btu producer gas in America then is assessed.

Effective Utilization Of Energy From Biomass Residues In Agricultural Applications, Harry W. Parker

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Biomass is one of the more attractive alternative energy sources. Use of existing biomass residues within the farm and ranch economy can be accomplished with a minimum of organizational problems since the producer, processor, and consumer may be the same person or organization. The major task is to provide potential agricultural biomass users with accurate cost estimates for the energy made available from the biomass, and contemporary technology for its utilization.

Specific examples are given with regard to powering irrigation well engines with cotton gin trash via a producer gas generator, and conversion of harvested mesquite wood to digestible energy …

Cost Accounting Regulations In Oil And Gas Industries, Lakshmi U. Tatikonda, Rao J. Tatikonda

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

The cost accounting methods that are currently used in the oil and gas Industry are very diverse. Since the 1973 Arab Oil Embargo, increased attention was given to this issue, which resulted in the issuance of SFAS-19 by the FA SB and the SEC’s attempt to develop a new accounting method based on the value of their reserves. The pros and cons of the existing methods are discussed. Also discussed is the need for a uniform accounting procedure.

Energy Substitution Prospects, Vaman Rao

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Any discussion about the future pattern of energy use invariably includes scernarios involving a switch-over to that source of energy which is available in abundant supply. It is taken for granted, for example, that coal will play a major role in the future and that the relative share of oil will decline with the passage of time. It is too simplistic to assume that a time series analysis will give the likely clues as to the pattern of switch-over from one source of energy to another. There has been a radical change in the structure of exchange relations between the …

National And Regional Agricultural Impact Of Natural Gas Deregulation And Curtailment Under A High Export Scenario, Barton C. English, Earl O. Heady, Dan Dvoskin

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

An interregional national linear program ring model is used to evaluate the national and regional inpacts cn agriculture of two alternative natural gas policies -- curtailment to irrigation and deregulation. Energy use, agricultural production, commodity shadow prices, and resource use under natural gas curtailment and deregulation are compared to a base nn without these policy changes.

Analysis Of Residential Electric Demand In Southwestern Indiana, Mangi L. Agarwal

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

This study analyzes the residential demand for electricity in the Southern Indiana Gas and Electric Company service area. It explores the many variables which may contribute to electricity consumption. It also attempts to synthesize various weather and climatic data into one variable called the "comfort index" which may explain part of the electricity consumption. In estimating the demand equations, monthly data for twelve years have been used.