Physical Sciences and Mathematics Commons^™

Angular Differential Cross Sections For Excitation Of Atomic Hydrogen To The N=2 Level By Proton Impact, John T. Park, Judith E. Aldag, Jerry Peacher, Jacob M. George

Physics Faculty Research & Creative Works

Differential cross sections for 15-145-keV proton impact excitation of atomic hydrogen to the n=2 level have been determined for center-of-mass scattering angles 0 to 1.2 mrad. The cross sections were obtained from an analysis of the angular distribution of protons which had lost an energy corresponding to the excitation of atomic hydrogen to its n=2 level. The differential cross sections obtained are in rather good agreement with available coupled-state calculations as well as the simpler Glauber-approximation calculations. However, at the larger scattering angles the cross sections obtained from the theoretical treatments appear to decrease more rapidly than the experimental data.

Potential Use Of Chemical Spot Test Method For Submicron Aerosol Sizing, Paul C. Yue, Josef Podzimek

Physics Faculty Research & Creative Works

A submicron particle, which is too small to be observed in an optical microscope, may form an observable spot on a chemically prepared substrate of the collector. The size of the spot or "Liesegang circle" is related to the aerodynamic diameter of the particle through a magnification factor. This paper presents the experimental results of the study of this factor using sodium chloride aerosol in the size range of 0.5 to 2 pm which has not previously been studied. We calibrated a cylindrical centrifuge with known sized latex particles. A relationship between the aerodynamic diameter and the deposition length is …

The Ferc's Purpa Cogeneration Rules: Economics, Rate Design, And Policy Aspects, Charles David Laderoute

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

Nearly two years have passed since the United States Congress enacted and the President signed into law the so-called National Energy Act which was actually comprised of five separate acts:

(1) Public Utility Regulatory Policies Act (PURPA)
(2) Powerplant and Industrial Fuel Use Act (FUA)
(3) Natural Gas Policy Act (NGPA)
(4) Energy Tax Act (ETA)
(5) National Energy Conservation Policy Act (NECPA)

Title II of PURPA addresses, inter alia, the issue of cogeneration: a technology that in recent years has received increasing attention as a method of utilizing our energy sources more efficiently. The first four of the above …

The Economics And Adaptation Of Microwave Heating & Cooling, Tom Day

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

From cooking potatoes to medical surgery, the microwave is causing an interesting and beneficial transition in our daily lives. High technology is producing an avalanche of microwave appliances and equipment which offer favorable results in energy conservation with impressive safety parameters at competitive costs. This paper examines the basis for the comparative economic benefit from microwave applications and sights several commercial and industrial avenues of conservation metit.

Embedding Discrete Flows On R In A Continuous Flow, P. L. Sharma, Troy L. Hicks

Mathematics and Statistics Faculty Research & Creative Works

The problem of determining when a given discrete flow on a topological space is embeddable in some continuous flow was mentioned by G. R. Sell ("Topological Dynamics and Ordinary Differential Equations," Van Nostrand, New York, 1971) in his book on topological dynamics. In this book, the theory of generalized dynamical systems is exploited in the qualitative study of differential equations. Even more complicated is the problem of simultaneously embedding two or more discrete flows in a single continuous flow. We examine both of these problems when the underlying topological space is the space R of the real numbers. © 1980.

Tolerance Intervals For A Class Of Ifr Distributions With A Threshold Parameter, Jagdish K. Patel

Mathematics and Statistics Faculty Research & Creative Works

One-sided upper and lower tolerance intervals based on type II censored data are obtained. Under certain conditions the tolerance factors can be obtained from known results on the 2-parameter exponential distribution. Copyright © 1980 by the Institute of Electrical and Electronics Engineers, Inc.

More On Calculators In Beginning Physics Courses, Harry A. Brown

Physics Faculty Research & Creative Works

No abstract provided.

Injection-Locked Dye Laser Pumped By A Xenon-Lon Laser, E. R. Carney, D. W. Fahey, Laird D. Schearer

Physics Faculty Research & Creative Works

Injection locking of a dye laser is reported for a 4-minor ring-cavity dye User pumped by a xenon-ion laser. Both a He-Ne laser and tunable CW dye laser were used as the injection sources. Copyright © 1980 by The Institute of Electrical and Electronics Engineers, Inc.

Large-Angle Electron-Photon Coincidence Experiment In Atomic Hydrogen, E. Weigold, L. Frost, K. (Kaare) J. Nygaard

Physics Faculty Research & Creative Works

1s-2p excitation in hydrogen has been studied by observing the angular correlation of Lyman photons detected in coincidence with inelastically scattered electrons at 54.4 eV incident energy. The electron scattering angles ranged from 10°to 133°; the results at scattering angles larger than 20°cannot be explained by currently available theories. © 1980 The American Physical Society.

Nonequilibrium Thermodynamics Of Fuel Cells: Heat Release Mechanisms And Voltage, Gerald Wilemski

Physics Faculty Research & Creative Works

Nonequilibrium thermodynamics is used to analyze the spatial distribution of heat release mechanisms occurring in fuel cells operating under load in nonisothermal steady states. Novel contributions to heat release in the bulk electrolyte are found which are analogous to Peltier and Thomson effects in metallic conductors. Expresions for the heat release at individual electrodes are presented. An equation for the voltage of these cells is also derived. © 1980 American Institute of Physics.

Mobility Of Solvent Molecules In A Nonaqueous Lyotropic Liquid Crystal, David W. Larsen, Stig Friberg, Hugo Christenson

Chemistry Faculty Research & Creative Works

No abstract provided.

Spectroscopic Investigation Of The Mutual Interactions Between Nonionic Surfactant, Hydrocarbon, And Water, Hugo Christenson, Stig Friberg

Chemistry Faculty Research & Creative Works

NMR, UV, and IR spectroscopy were used to determine the interactions in hydrocarbon solutions between polyethylene glycol alkyl ethers, water, and aromatic hydrocarbons. The results showed a concentration dependence for the site of benzene in benzene/surfactant solutions. At low concentrations the benzene molecules were preferentially located adjacent to the surfactant oxyethylene chain with an even distribution along the chain. At high benzene concentrations a positive concentration gradient was found toward the hydrocarbon end of the oxyethylene chain. Addition of water increased this gradient except for the octa ethylene glycol dodecyl ether; for this compound the preferential water location appeared to …

Nmr Investigations Of Aggregation Of Nonionic Surfactants In A Hydrocarbon Medium, Hugo Christenson, Stig Friberg, David W. Larsen

Chemistry Faculty Research & Creative Works

Proton NMR, carabon-13 NMR, light-scattering, and density measurements were used to investigate association structures and molecular interactions during water solubilization in polyoxymethylene dodecyl ether/benzene systems at high surfactant concentrations. The results indicated an absence of association aggregates at low water concentrations. At water contents between 10 and 20%, association structures started to form, probably micelles of the inverse type, in which the water-polyoxymethylene chain interaction is the predominant feature. There is evidence that the average chain conformation changes with water content, and that bound water molecules are distributed evenly along the polyethoxyethylene chain. At higher water concentration, the results indicated …

Evidence For An Iminium Cation Intermediate And Its Non‐Oxidative Decarboxylation In A Cerium (Iv)‐Mediated Oxidative Decarboxylation. Preliminary Communication, Samir B. Hanna, Marilyn E. Moehlenkamp

Chemistry Faculty Research & Creative Works

Evidence is provided for the occurrence of a non‐oxidative decarboxylation in an iminium cation intermediate which is produced in an oxidative decarboxylation induced by cerium (IV). Copyright © 1980 Verlag GmbH & Co. KGaA, Weinheim

A Molecular Dynamics Study Of The Stability Of Small Prenucleation Water Clusters, Tze-Shan Chen

Doctoral Dissertations

"The dynamical stability and internal energy distribution of prenucleation water embryos have been studied by the molecular dynamic's method. Water clusters containing either five or twenty molecules were chosen to represent prenucleation embryos of small or intermediate size. A central force potential model of water which allows energy to be absorbed into intramolecular modes so that bond lengths and bond angles could adjust to changes in molecular environments was employed to describe the interaction between all pairs of atoms. The motion of the molecules was followed for extended time periods (of the order of several picoseconds) at each of a …

Comment On “Cancellation Of Internal Forces”, Harry A. Brown

Physics Faculty Research & Creative Works

No abstract provided.

Water And Ice Nucleation Sites From Ion Implantation Of Silicon, William H. Stlnebaugh, Don M. Sparlin, James L. Kassner

Physics Faculty Research & Creative Works

Ion implantation has a substantial effect on the heterogeneous nucleation of water and ice. An enhancement of water nucleation and a suppression of ice nucleation occurred for samples of silicon implanted with ions of various species and dosage. These effects were noticeable only for samples implanted with ion doses approaching or exceeding the critical dose necessary to produce amorphous silicon. The behavior of the water droplet and ice crystal growth can be related to the amount of ion produced damage to the substrate surface. The nature of the damage can be controlled by variation of the incident ion species, dose, …

Autooscillations And Nonlinear Anelasticity, Manfred Wuttig, Tetsuro Suzuki

Materials Science and Engineering Faculty Research & Creative Works

In conclusion it can be stated that a novel phenomenon, a mechanical auto oscillation, has been described theoretically and shown to exist experimentally. These auto oscillations occur when a nonlinear anelastic solid is forced into large amplitude oscillations in the vicinity of a martensitic transformation. They manifest themselves as a low frequency auto modulation of the a martensitic transformation. They manifest themselves as low frequency auto modulation of the forced vibration of such a solid. © 1980.

Total Penning Ionization Cross Sections Of Cd And Zn For He(2 ³S1) Atoms, D. W. Fahey, William F. Parks, Laird D. Schearer

Physics Faculty Research & Creative Works

The total Penning ionization cross sections for Cd and Zn for He(2 3S1) atoms have been measured. The method used was that of Penning ion collection from a vapor cell through which a He(2 3S1) beam was passed. The beam energy was 66 meV with a velocity spread of 45%. The measured cross sections were 106(±22) and 35(±7) Å2 for the Cd and Zn targets, respectively. © 1980 American Institute of Physics.

Fossil Algae In The St. Louis Limestone, Near St. Louis, Missouri, Sherris Ragsdale Myers

Masters Theses

"Although Mississippian algae research is fairly extensive, little has been published on algae from the Mississippian type locality, the Upper Mississippi River Valley. For this study, portions of sixteen St. Louis Limestone stratigraphic sections containing units with oncolites, domal stromatolites, laminations, or mottled (possibly algal) textures, were measured, described, and sampled to determine: (1) to what extent algae are preserved in the St. Louis Limestone, (2) if enough of the delicate structure was fossilized to determine morphology, (3) depositional environment of the algae, and (4) if the algae are related to a lithologic pattern. Thin sections of the sampled units …

Nickel Carbide: Its Formation And Characterization By Transmission Electron Diffraction, Auger Electron Spectroscopy And Electron Spectroscopy For Chemical Analysis, J. Kleefeld, L. L. Levenson

Physics Faculty Research & Creative Works

Nickel carbide (NiC3) films are formed by the carburization of nickel films in CO at 350°C. The presence of Ni3C is demonstrated by transmission electron diffraction. The carbon Auger electron signal of Ni3C is identical with the carbon Auger spectra attributed to Ni3C by previous authors. The position of the C 1s electron spectroscopy for chemical analysis peak is within 1 eV of the C 1s peak produced by graphite. The grain size of polycrystalline Ni3C is significantly larger than the grain size of the nickel film from which it is grown. © 1979.

Electron Drift Velocities In N2, Co2, And (N 2+Co2) Laser Mixtures, Rafael A. Sierra, Howard L. Brooks, Kaare J. Nygaard

Physics Faculty Research & Creative Works

A time-of-flight technique has been used to obtain electron drift velocities in N₂, CO₂, and N₂-CO₂ mixtures covering the E/N range 3-93 Td. In the case of the pure gases, excellent agreement with previous work is obtained over the entire E/N range. The mixtures, which are of laser importance, have not been studied previously.

The Hanle Effect In Penning-Excited Ions, D. W. Fahey, William F. Parks, Laird D. Schearer

Physics Faculty Research & Creative Works

A thermal beam of helium (23S1) metastable atoms was used to excite coherently the 2P3/2 levels of Ca, Sr and Ba in a Penning ionizing collision. The coherent excitation of the ions appears as a linear polarization of the optical emission from the excited ions. The degree of linear polarization is 5.5, 3.5 and 0.5% for Ca, Sr and Ba, respectively, with the polarization parallel to the beam direction. Hanle effect signals from the 2P3/2 level of Sr were observed and the radioactive decay rate measured.

Conductive Strontium Titanate Layers Produced By Boron-Ion Implantation, Connie M. Cooper, P. S. Nayar, Edward Boyd Hale, Robert Gerson

Physics Faculty Research & Creative Works

The ion implantation of boron has been found to be an effective method for increasing the conductivity of strontium titanate. A highly conductive layer was formed by implantations at doses of 3.6x1016 to 1.0x1017 ions/cm2, using an accelerating voltage of 100 kV, corresponding to a boron range of about 300 nm. The conductivity of the implanted layer was found to be further enhanced by about four orders of magnitude after annealing at 225 °C. The surface resistivity attained was typically 1000 Ω/square at room temperature. The resistance increased with rising temperature between 77 and 500 K. All samples were found …

Lasers In Energy Research, Kaare J. Hygaard, Howard L. Brooks, Rafael A. Sierra, Stephen R. Foltyn

UMR-DNR Conference on Energy

No abstract provided.

The Moral Equivalent Of Business As Usual, Harry A. Brown

UMR-DNR Conference on Energy

No abstract provided.

Doubly Differential Cross Sections For Proton-Impact Ionization Of Argon, Don H. Madison, Steven Trent Manson

Physics Faculty Research & Creative Works

Proton-impact-ionization cross sections for argon which are differential in the energy and angle of the ejected electron have been calculated within the framework of the Born approximation using both Hartree-Slater and Hartree-Fock wave functions for the ejected electron. Results of the two types of calculations are compared with each other and with experiment. Differential cross sections for all five sub shells of argon are examined and particular attention is given to some interesting features of the K-shell cross sections. The range of applicability of the theoretical models is discussed.

Crystal Structures Of A₂Fecl₅·H₂O (A=Rb⁺, Cs⁺) And Field Dependent Superconducting Susceptometer Measurements, Charles J. O'Connor, Bascom Sine Deaver, Ekkehard Sinn

Chemistry Faculty Research & Creative Works

Crystal structures and low field principal crystal axis magnetic measurements are reported for the antiferromagnetic iron (III) salts A₂FeCl₅·H₂O; A=Rb⁺, Cs⁺. The two compounds undergo a zero field paramagnetic to antiferromagnetic phase transition at 6.5 K (A=Cs⁺) and 10.05 K (A=Rb⁺). The spin flop magnetic phase is observed in high field measurements. The magnetic field-temperature phase diagrams are reported. All magnetic measurements were recorded on a superconducting susceptometer. The bicritical points are 6.25 K, 14.5 kOe (A=Cs⁺), 9.75 K, 17.8 KOe (A=Rb⁺). …

Newtruck: A Comprehensive Long-Term Project In Computer Science, Daniel C. St. Clair

Mathematics and Statistics Faculty Research & Creative Works

No abstract provided.

Dissociative Excitation Of Hgbr2 In Collisions With A Beam Of Metastable Nitrogen, D. W. Fahey, Laird D. Schearer

Physics Faculty Research & Creative Works

No abstract provided.