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Articles 1 - 30 of 36
Full-Text Articles in Physical Sciences and Mathematics
Precision Expansion Cloud Chamber For Homogeneous Nucleation Studies, John L. Schmitt
Precision Expansion Cloud Chamber For Homogeneous Nucleation Studies, John L. Schmitt
Physics Faculty Research & Creative Works
The author describes an expansion cloud chamber for the study of the nucleation of a single component vapor (homogeneous nucleation). The design draws on the many years of experience in this Center in construction of chambers for homogeneous nucleation of water. Design features of the chamber are exact control of temperature (±0.03° C), pressure (±0.5 mm Hg), and automatic control of cycling. Construction features are all construction materials are stainless steel, glass, or fluorocarbon plastics; the piston seal is a very flexible welded stainless-steel bellows; the chamber can be made very clean by heating under vacuum, and it is compatible …
Crystal Perfection Of Hgi2 Studied By Neutron And Gamma-Ray Diffraction, W. (William) B. Yelon, R. W. Alkire, M. M. Schieber, L. Van Den Berg, S. E. Rasmussen, H. Christensen, J. R. Schneider
Crystal Perfection Of Hgi2 Studied By Neutron And Gamma-Ray Diffraction, W. (William) B. Yelon, R. W. Alkire, M. M. Schieber, L. Van Den Berg, S. E. Rasmussen, H. Christensen, J. R. Schneider
Physics Faculty Research & Creative Works
The crystalline perfection of wire sawn pieces of vapor grown single crystals of mercuric iodide was compared with the perfection of (00l) cleaved sections of the same crystal from which nuclear radiation detectors have been fabricated. The crystalline perfection was studied using neutron and gamma-ray diffraction rocking curves. Most of the gamma-ray data were obtained using a high intensity source of 153Sm gamma rays with a wavelength of λ = 0.12 Å. Some of the data were obtained using highly penetrating 198Au gamma rays with a shorter wavelength of λ = 0.03 Å. The neutrons had a wavelength of λ …
Hot-Wire Anemometer Behaviour In Low Velocity Air Flow, P. J. Christman, Josef Podzimek
Hot-Wire Anemometer Behaviour In Low Velocity Air Flow, P. J. Christman, Josef Podzimek
Physics Faculty Research & Creative Works
The behavior characteristics of a commercially available hot-wire anemometer have been examined in the presence of low velocities, lwss than 0.1 m/s for the most part, and in both horizontal and vertical air flows. The orientation of the probe in a horizontal flow has been found to have a definite effect on velocity measurements, and a lower limit to the reliable application of hot-wire anemometry has been evaluated for a particular type of probe. Vertical flow measurements have resulted in the discovery of the magnitude of natural convective velocity, and a possible method for determining the dimensions of the temperature …
Orientation Of Atoms Excited By Charged Particles At High Impact Energies, Don H. Madison, Kieth H. Winters
Orientation Of Atoms Excited By Charged Particles At High Impact Energies, Don H. Madison, Kieth H. Winters
Physics Faculty Research & Creative Works
A perturbation-expansion approach is used to examine the sign of the orientation vector as a function of scattering angle and projectile charge. It is shown that for small angles, the sign of the orientation vector is different for oppositely charged projectiles consistent with the prediction of the classical grazing model. At large angles, on the other hand, the orientation vector for oppositely charged projectiles is shown to have the same sign.
The Water Monomer On The Prism Face Of Ice And Above A Four Layer Ice Basal Face Ledge: An Effective Pair Potential Model, Barbara N. Hale, Jerry Kiefer, Carolyn A. Ward
The Water Monomer On The Prism Face Of Ice And Above A Four Layer Ice Basal Face Ledge: An Effective Pair Potential Model, Barbara N. Hale, Jerry Kiefer, Carolyn A. Ward
Physics Faculty Research & Creative Works
A previous study of the water monomer on the basal faces of ice is extended to consider the interaction of the water molecule with a rigid prism face of ice and with an ice basal face ledge. The effective central force H2O-H2O potentials of Stillinger and Rahman are used to generate maximal binding energy surfaces for the H2O adsorbed on the sample substrates. The results indicate that the prism face of ice binds the water molecule more strongly than the basal faces, and the step on the basal face serves to expose high binding …
Structural And Magnetic Properties Of Co(Urea)₂Cl₂·2h₂O: A Two-Dimensional Lsing System With Hidden Canting, Richard Lewis Carlin, Kyong O. Joung, Andries Van Der Bilt, H. Den Adel, Charles J. O'Connor, Ekkehard Sinn
Structural And Magnetic Properties Of Co(Urea)₂Cl₂·2h₂O: A Two-Dimensional Lsing System With Hidden Canting, Richard Lewis Carlin, Kyong O. Joung, Andries Van Der Bilt, H. Den Adel, Charles J. O'Connor, Ekkehard Sinn
Chemistry Faculty Research & Creative Works
The characterization of Co(urea)2Cl2·2H2O is reported. The crystal structure at ambient temperatures yields the following information: the chlorine, water, and urea group are coordinated, the urea being bound via the oxygen, to form an octahedral environment about the metal atom. Intermolecular hydrogen bonds between the coordinated chlorine and water ligands produce parallel infinite sheets which provide a two-dimensional exchange pathway. The sheets are separated by the urea ligands and may be considered as magnetically isolated from one another. Crystal data: space group P21/c, Z = 2, α = 7.397 (3) Å, b …
Differential Cross Sections For Electron Capture From Helium By 25- To 100-Kev Incident Protons, Paul J. Martin, Kenneth E. Arnett, D. M. Blankenship, Thomas J. Kvale, Jerry Peacher, E. Redd, V. C. Sutcliffe, John T. Park, Chiidong Lin, Jim H. Mcguire
Differential Cross Sections For Electron Capture From Helium By 25- To 100-Kev Incident Protons, Paul J. Martin, Kenneth E. Arnett, D. M. Blankenship, Thomas J. Kvale, Jerry Peacher, E. Redd, V. C. Sutcliffe, John T. Park, Chiidong Lin, Jim H. Mcguire
Physics Faculty Research & Creative Works
Experimentally and theoretically determined differential cross sections are reported for electron capture in collisions of protons with helium atoms for incident proton energies of 25, 30, 50, and 100 keV and for center-of-mass scattering angles of 0.0 to 2.0 mrad. The magnitudes of the experimentally determined differential cross sections decrease from 10-10 to 10-12 cm2/sr within the 0.0-0.8-mrad range of the center-of-mass scattering angle. At approximately 0.8 mrad a distinct change in the slope of the differential cross section is observed. The experimental results which are for capture into all bound states of hydrogen are compared …
Electron Capture At Very Small Scattering Angles From Atomic Hydrogen By 25-125-Kev Protons, Paul J. Martin, D. M. Blankenship, Thomas J. Kvale, E. Redd, Jerry Peacher, John T. Park
Electron Capture At Very Small Scattering Angles From Atomic Hydrogen By 25-125-Kev Protons, Paul J. Martin, D. M. Blankenship, Thomas J. Kvale, E. Redd, Jerry Peacher, John T. Park
Physics Faculty Research & Creative Works
Differential cross sections for electron capture in collisions between protons and hydrogen atoms have been experimentally determined for incident proton energies of 25, 60, and 125 keV in the center-of-mass scattering-angle range of 0-3 mrad. The experimental results compare more favorably with the results of both a multistate and a two-state calculation than with the results of a continuum distorted-wave-approximation calculation. There is no evidence of a Jackson-Schiff-type minimum.
A Topological Analysis Of The Complexity Of Computer Programs With Less Than Three Binary Branches, Warren Harrison, Kenneth I. Magel
A Topological Analysis Of The Complexity Of Computer Programs With Less Than Three Binary Branches, Warren Harrison, Kenneth I. Magel
Computer Science Faculty Research & Creative Works
No abstract provided.
Angular Differential And Total Cross Sections For The Excitation Of Atomic Hydrogen To Its N=2 State By Helium Ions, Judith E. Aldag, Jerry Peacher, Paul J. Martin, V. C. Sutcliffe, Jacob M. George, E. Redd, Thomas J. Kvale, D. M. Blankenship, John T. Park
Angular Differential And Total Cross Sections For The Excitation Of Atomic Hydrogen To Its N=2 State By Helium Ions, Judith E. Aldag, Jerry Peacher, Paul J. Martin, V. C. Sutcliffe, Jacob M. George, E. Redd, Thomas J. Kvale, D. M. Blankenship, John T. Park
Physics Faculty Research & Creative Works
Differential cross sections for 15-100 keV He+ excitation of atomic hydrogen to its n=2 level have been determined for c.m. angles from 0 to 8 mrad. The differential cross sections are obtained from an analysis of the angular distribution of the scattered ions which have lost an energy corresponding to the excitation of the target to its n=2 level. The shape of the differential cross section changes rapidly with increasing incident energy. At 15 keV, the differential cross section falls off by a factor of 5 in 6 mrad. At 100 keV, the differential cross section decreases by nearly …
Recommendations For Master's Level Programs In Computer Science: A Report Of The Acm Curriculum Committee On Computer Science, Kenneth I. Magel, Richard H. Austing, Alfs Berztiss, Gerald L. Engel, John Wesley Hamblen, A. A.J. Hoffmann, Robert Mathis
Recommendations For Master's Level Programs In Computer Science: A Report Of The Acm Curriculum Committee On Computer Science, Kenneth I. Magel, Richard H. Austing, Alfs Berztiss, Gerald L. Engel, John Wesley Hamblen, A. A.J. Hoffmann, Robert Mathis
Computer Science Faculty Research & Creative Works
The ACM Committee on Curriculum in Computer Science has spent two years investigating master's degree programs in Computer Science. This report contains the conclusions of that effort. Recommendations are made concerning the form, entrance requirements, possible courses, staffing levels, intent, library resources, and computing resources required for an academic, professional, or specialized master's degree. These recommendations specify minimum requirements which should be met by any master's programs. The Committee believes that the details of a particular master's program should be determined and continually updated by the faculty involved. A single or a small number of model programs are not as …
Effect Of Polarization And Absorption On Differential Cross Sections And Angular Correlation Parameters For Electron Excitation Of Helium, M. E. Stewart, Don H. Madison
Effect Of Polarization And Absorption On Differential Cross Sections And Angular Correlation Parameters For Electron Excitation Of Helium, M. E. Stewart, Don H. Madison
Physics Faculty Research & Creative Works
The effects of local polarization and absorption potentials on differential cross sections and angular correlation parameters are studied within the distorted-wave approximation for electron excitation of the 2 1P state of helium. For examining the effect of local polarization, we have compared a recent numerical self-consistent adiabatic polarization potential for helium with the commonly used hydrogenic adiabatic polarization potential. Different radial regions for the polarization potential were studied to determine their contribution to the overall effect of polarization. Calculations are also presented which show the effects of different strengths for a local absorption potential.
Regular Expressions In A Program Complexity Metric, Kenneth I. Magel
Regular Expressions In A Program Complexity Metric, Kenneth I. Magel
Computer Science Faculty Research & Creative Works
No abstract provided.
A Complexity Measure Based On Nesting Level, Warren A. Harrison, Kenneth I. Magel
A Complexity Measure Based On Nesting Level, Warren A. Harrison, Kenneth I. Magel
Computer Science Faculty Research & Creative Works
No abstract provided.
A Suggested Course In Introductory Computer Programming, Warren A. Harrison, Kenneth I. Magel
A Suggested Course In Introductory Computer Programming, Warren A. Harrison, Kenneth I. Magel
Computer Science Faculty Research & Creative Works
Introductory programming courses have long been a popular topic of discussion. Often it is either the only computer course a student takes, or it is the foundation upon which all further training in computer science is built. The usual goal of such a course is to introduce the student to the use of a computer to solve simple problems in his or her particular discipline. Generally, the method of presenting the material may be separated into two distinct schools of thought, which we have termed the "Black Box School of Thought" and the "White Box School of Thought". In this …
Autooscillations In Zinc, Manfred Wuttig, Alex Aning, Tetsuro Suzuki
Autooscillations In Zinc, Manfred Wuttig, Alex Aning, Tetsuro Suzuki
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Classes Of L¹-Convergence Of Fourier And Fourier-Stieltjes Series, Časlav V. Stanojevic
Classes Of L¹-Convergence Of Fourier And Fourier-Stieltjes Series, Časlav V. Stanojevic
Mathematics and Statistics Faculty Research & Creative Works
It is shown that the Fomin class FP (1
< 2) is a subclass of C ∩ B V, where C is the Garrett-Stanojevic class and B V the class of sequences of bounded variation. Wider classes of Fourier and Fourier-Stieltjes series are found for which an lg n - o(1), n → ∞, is a necessary and sufficient condition for L1-convergence. For cosine series with coefficients in B V and n∆an = 0(1), n → ∞, necessary and sufficient integrability conditions are obtained. © 1981 American Mathematical Society.
Integral Identities Of Norms And Characterization Of Inner Product Spaces, Časlav V. Stanojevlć, Ana M. Suchanek
Integral Identities Of Norms And Characterization Of Inner Product Spaces, Časlav V. Stanojevlć, Ana M. Suchanek
Mathematics and Statistics Faculty Research & Creative Works
Integral identities of norms over compact groups are used to characterize inner product spaces. These integral identities also generalize the Penico- Stanojevic [1] integral form of the parallelogram law. © 1981 American Mathematical Society. © 1981 American Mathematical Society.
Effective Swarm Parameters And Transport Coefficients In Co2 Laser Mixtures, R. A. Sierra, H. L. Brooks, A. J. Sommerer, S. R. Foltyn, Kaare J. Nygaard
Effective Swarm Parameters And Transport Coefficients In Co2 Laser Mixtures, R. A. Sierra, H. L. Brooks, A. J. Sommerer, S. R. Foltyn, Kaare J. Nygaard
Physics Faculty Research & Creative Works
A pulsed electron swarm technique has been used to obtain effective attachment and ionization cross-sections as well as electron drift velocities in mixtures of CO2 laser interest. In binary CO2:N 2 mixtures, below a reduced electric field of E/N=60*10 -17 V cm2, attachment was the principal ion production process. (N is the total gas number density.) The reduced attachment coefficients measured were small and in excellent agreement with numerical predictions. In ternary mixtures of He:CO2:N2, positive ion formation described by Townsend's first ionisation coefficient played a more important role over the same range of E/N. …
Excitation Transfer In Ion Rydberg-Atom Collisions, R. (Ronald) E. Olson
Excitation Transfer In Ion Rydberg-Atom Collisions, R. (Ronald) E. Olson
Physics Faculty Research & Creative Works
Recently, electron-loss cross sections were presented by Kim and Meyer [Phys. Rev. Lett. 44, 1047 (1980)] for 40 keV/amu N3+ + H**(n) collisions which scaled as n3.12, where n is the principal quantum number of the excited H0. Such results are in contrast to an n2 scaling predicted by classical and first-Born theoretical methods. Our calculations indicate that a major component of the experimentally observed ion signal was due to Stark ionization by deflector grids of highly excited H0 produced in excitation-transfer collisions. Inclusion of the excitation process in a theoretical interpretation reveals qualitative agreement between theory and experiment and …
N,L Distributions In Aq++H Electron-Capture Collisions, R. (Ronald) E. Olson
N,L Distributions In Aq++H Electron-Capture Collisions, R. (Ronald) E. Olson
Physics Faculty Research & Creative Works
The classical-trajectory Monte Carlo method has been used to determine product-state distributions in Aq++HA(q-1)+(nl)+H+ electron-capture collisions at energies 50 and 100 keV/amu for fully stripped ions in charge states q=1to 20. In the energy region studied, the electron-capture products are found to populate predominately principal quantum numbers around nmq34. Such behavior implies the captured electron tries to preserve both its original orbital energy and dimensions after the electron-capture collision. The orbital-angular-momentum quantum numbers l are more highly peaked than statistical to large l values for nnm. © 1981 The American Physical Society.
The Double Eigenvalue Problem; Including Numerical Solutions, John Gregory, Ralph W. Wilkerson
The Double Eigenvalue Problem; Including Numerical Solutions, John Gregory, Ralph W. Wilkerson
Computer Science Faculty Research & Creative Works
No abstract provided.
Similarity In Phase Diagrams Between Ionic And Nonionic Surfactant Solutions At Constant Temperature, K. Shinoda, H. Kunieda, N. Obi, Stig Friberg
Similarity In Phase Diagrams Between Ionic And Nonionic Surfactant Solutions At Constant Temperature, K. Shinoda, H. Kunieda, N. Obi, Stig Friberg
Chemistry Faculty Research & Creative Works
No abstract provided.
Glow Discharge Polymerization., H. Yasuda
Glow Discharge Polymerization., H. Yasuda
Chemistry Faculty Research & Creative Works
In this review-paper the author summarizes some important aspects of ″polymer formation″ in the glow discharge polymerization or plasma polymerization, rather than presenting a bibliographical review of work. It is shown that glow discharge polymerization can be visualized as a process consisting of three discharge processes. These are (1) controlled discharge of monomer, (2) electric discharge (glow discharge), and (3) glow discharge polymerization of the monomer. Before the electric discharge is initiated, a steady-state flow of the monomer is generally established. During this controlled discharge of the monomer (without electric discharge), adsorption of the monomer onto the solid surfaces in …
The Initial And Terminating Stage Of Glow Discharge Polymerization Investigated By Thickness Monitor, N. Inagaki, H. Yasuda
The Initial And Terminating Stage Of Glow Discharge Polymerization Investigated By Thickness Monitor, N. Inagaki, H. Yasuda
Chemistry Faculty Research & Creative Works
An attempt to discuss the initial stage and terminating stage of glow discharge polymerization was made by selecting the monomer system of styrene and acetylene, which differ in their condensability, and a certain polymerization procedure. Results indicate the important aspects of the initial and terminating stages of glow discharge polymerization. These aspects may not play a significant role in the study of bulk properties of plasma‐polymerized polymers or in the study of polymer deposition rate. However, the initial stage effect might influence the adhesion of the polymer. The terminating stage effect might influence the surface characteristics of glow discharge‐polymerized polymers. …
Distribution Of Polymer Deposition In Glow Discharge Polymerization In A Capacitively Coupled System, N. Inagaki, H. Yasuda
Distribution Of Polymer Deposition In Glow Discharge Polymerization In A Capacitively Coupled System, N. Inagaki, H. Yasuda
Chemistry Faculty Research & Creative Works
The manner by which polymers created by plasma uniformly deposit onto substrates was sought. By rotating the substrate placed midway between electrodes, completely uniform distribution of polymer deposition was accomplished, and the deviation of the polymer deposition in a radius direction of the rotating substrate was within experimental errors. Materials of the substrate on which the polymer deposited had no influence on uniformity of polymer deposition, but the electrical circuit of power source, i.e., grounding an electrode, markedly disturbed the uniformity. Thickness of polymers deposited on the substrate was linearly proportional to reaction time. Surface energies of deposited polymers prepared …
The Effect Of Plasma-Deposited Polymers On The Nucleate Boiling Behavior Of Copper Heat Transfer Surfaces, T. Hinrichs, E. Hennecke, H. Yasuda
The Effect Of Plasma-Deposited Polymers On The Nucleate Boiling Behavior Of Copper Heat Transfer Surfaces, T. Hinrichs, E. Hennecke, H. Yasuda
Chemistry Faculty Research & Creative Works
The effect of plasma deposited polymers on the nucleate boiling behavior of copper heat transfer surfaces, using water as the boiling liquid, was determined. The monomers used were tetrafluoroethylene (TFE) and methane. It was found that an 18 nm thick coating of TFE enhanced the nucleate boiling, while a 150 nm thick coating reduced the nucleate boiling. Both 15 nm and 150 nm thick coatings of methane reduced the nucleate boiling, with the effect being more pronounced with the thicker coating. A surface energy effect is postulated to explain the enhanced boiling observed. © 1981.
The Structure Of Lamellar Lyotropic Liquid Crystals From Lecithin And Alkanediols, Magda A. El-Nokaly, Larry D. Ford, Stig Friberg, David W. Larsen
The Structure Of Lamellar Lyotropic Liquid Crystals From Lecithin And Alkanediols, Magda A. El-Nokaly, Larry D. Ford, Stig Friberg, David W. Larsen
Chemistry Faculty Research & Creative Works
Lamellar liquid crystals from lecithin and alkane diols were studied to determine the composition range of stability and geometrical dimensions using low-angle X-ray scattering. An estimation of the dislocation pattern was made from the optical pattern in polarized light. The ethylene glycol gave the widest range of stability for the lamellar structure, the range being reduced toward heptane diol, the longest member to give liquid crystals. The interlayer spacing was reduced with increasing chain length of the diol and the dislocation pattern remained identical. © 1981.
Adhesion Of Glow Discharge Polymers To Metals And Polymers, N. Inagaki, H. Yasuda
Adhesion Of Glow Discharge Polymers To Metals And Polymers, N. Inagaki, H. Yasuda
Chemistry Faculty Research & Creative Works
Adhesion of glow discharge polymers to metals and polymers in an adhesive joint was measured by lap‐shear test and immersion in hot water of 70°C for an extended time. A glow discharge polymer was deposited onto polymers [polyethylene and poly(tetrafluoroethylene)] and metals (aluminum and stainless steel) prior to when the polymer and metal were joined. It is found that the lap‐shear strength is enhanced by coating the surfaces of these substrates with plasma film produced from methane, ethylene, and acetylene, and that deterioration of the adhesive bonding part, when immersed in hot water of 70°C, is strongly dependent on the …
Modern Spectroscopy With A Spectrometer By The Optogalvanic Effect, Kenneth Arnett, Richard A. Anderson, Ralph William Alexander
Modern Spectroscopy With A Spectrometer By The Optogalvanic Effect, Kenneth Arnett, Richard A. Anderson, Ralph William Alexander
Physics Faculty Research & Creative Works
An Experiment Involving the Optogalvanic Effect Suitable for the Advanced Physics Laboratory is Described. This Experiment Complements the Usual Basic Experiment in Atomic Spectroscopy Where Spectra Are Recorded on Photographic Film with a Spectrograph or with a Monochromator and Photomultiplier. the Optogalvanic Effect Used the Atoms Being Studied as the Detector and a Tunable Dye Laser as the Source. Linewidths Observed Are Those of the Dye Laser that Are Considerably Smaller Than Those Obtained with the Usual Laboratory Monochromator. the student is Introduced to the Techniques of Spectroscopy with Pulsed Dye Lasers and to a Spectrum for Which LS Coupling …