Physical Sciences and Mathematics Commons^™

A Split-Phase Interface For Parallel File Systems, Sanjay Khanna, David Kotz

Computer Science Technical Reports

We describe the effects of a new user-level library for the Galley Parallel File System. This library allows some pre-existing sequential programs to make use of the Galley Parallel File System with minimal modification. It permits programs to efficiently use the parallel file system because the user-level library groups accesses together. We examine the performance of our library, and we show how code needs to be modified to use the library.

The Geodetic Signature Of The M8.0 Oct. 9, 1995, Jalisco Subduction Earthquake, Timothy I. Melbourne, I. Carmichael, C. Demets, K. Hudnut, O. Sanchez, J. Stock, G. Suarez, F. Webb

Faculty Scholarship for the Cascadia Hazards Institute

The October, 1995 Mw 8.0 Jalisco subduction earthquake has provided a thorough geodetic observation of the coseismic subduction process. An 11 station regional GPS network located directly onshore of the rupture demonstrates consistent vertical subsidence verified by tide gauge data and southwest-directed extension, with measured displacements reaching 1 meter. Unusually shallow and non-uniform faulting is required to explain the displacements. We determine that up to 5 meters of slip occurred within the upper 15 km of the thrust fault zone and 2 meters possibly as shallow as 8 km, and that slip was likely distributed in two main patches. The …

Sea Brightness Temperature And Effects Of Spray And Whitecaps, Richard P. Barber Jr., Jin Wu

Physics

Following the approach of Tang [1974], the microwave brightness of the sea surface is recalculated with recent parameterizations in terms of wind velocity for the slope distribution and whitecap coverage of the sea surface and the contribution of sea spray. The difference between this revised calculation with no free parameters and the earlier one becomes more significant as the wind velocity increases; it reaches 10 K or more at a wind velocity of 20 m s-1. Present predictions compare favorably with experimental results, suggesting that this model does include the essential physical mechanisms.

Effects Of Low Polymer Content In A Liquid-Crystal Microlens, Toshiaki Nose, Shin Masuda, Susumu Sato, Jianlin Li, Liang-Chy Chien, Philip Bos

Liang-Chy Chien

A small number of bifunctional monomers are mixed with a nematic liquid crystal (LC) and cured with a distributed electric field, which is produced by a circular-hole-patterned electrode structure. A gradient type of lens, that is, a LC microlens, is investigated for various polymer concentrations. Addition of 3% polymer is enough to freeze the gradient-index properties of the structure in the form of a convex lens, and a polymer-stabilized LC microlens is demonstrated. Although a lower concentration of polymer cannot hold the distribution properties in a curing process, it can maintain the variable focus as a nematic material can. The …

Effects Of Low Polymer Content In A Liquid-Crystal Microlens, Toshiaki Nose, Shin Masuda, Susumu Sato, Jianlin Li, Liang-Chy Chien, Philip J. Bos

Philip J. Bos

A small number of bifunctional monomers are mixed with a nematic liquid crystal (LC) and cured with a distributed electric field, which is produced by a circular-hole-patterned electrode structure. A gradient type of lens, that is, a LC microlens, is investigated for various polymer concentrations. Addition of 3% polymer is enough to freeze the gradient-index properties of the structure in the form of a convex lens, and a polymer-stabilized LC microlens is demonstrated. Although a lower concentration of polymer cannot hold the distribution properties in a curing process, it can maintain the variable focus as a nematic material can. The …

Two-Photon Optogalvanic Spectra Of Argon: Odd Parity Rydberg States, Naveed Piracha, M. Baig, S. Khan, B. Suleman

Naveed K. Piracha

Extensive new data on the odd-parity, single-colour, two-photon optogalvanic spectra of argon in the visible region is reported using an excimer-pumped dye laser in conjunction with an argon discharge cell. The experimental technique enables us to record a pure two-photon spectrum in a region which is dominated by one-photon transitions. A large number of two-photon transitions, originating from the two metastable states [...] and [...] to the excited states of configurations [...] (J=0, 2) and [...] (J = 0 - 4) of argon, has been recorded and arranged into 10 Rydberg series. The interchannel interactions among the [...] and the …

Assessing The Hazard To Granivorous Birds Feeding On Chemically Treated Seeds, Michael L. Avery, David L. Fischer, Thomas M. Primus

United States Department of Agriculture Wildlife Services: Staff Publications

Current methods for evaluating hazards to seed-eating birds are based on estimated exposure per unit area and assume that birds ingest all of the chemical on a treated seed. In an earlier study, however, it was determined that red-winged blackbirds removed only about 15% of an insecticidal treatment applied to individual rice seeds. Here, we extend those findings by examining the seed-handling behavior of four granivorous bird species exposed to millet, rice, sunflower and sorghum treated with imidacloprid. Mourning doves (Zenaida macroura L.) swallowed the seed whole. House finches (Carpodacus mexicanus Muller), red-winged blackbirds (Agelaius phoeniceus L.) …

Kilauea Volcano Provides Hot Seismic Data For Joint Japanese-U.S. Experiment, Stephen R. Mcnutt, Y. Ida, B. A. Chouet, P. Okubo, J. Oikawa, G. Saccorotti

School of Geosciences Faculty and Staff Publications

A team of 25 researchers from the United States, Japan, and Italy joined the staff of the Hawaiian Volcano Observatory (HVO) from January 8 through February 9, 1996, to make the most detailed seismic recordings on Kilauea Volcano ever. One-hundred-sixteen portable seismographs were installed in and near Kilauea Crater in Hawaii Volcanoes National Park as a joint Japanese-U.S. research project to record volcanic earthquakes and tremor. The importance of these events has long been recognized, but their origin remains poorly understood due to inadequate network coverage and limitations of the analog instrumentation used in the past.

On February 1, a …

Grains In Ionized Nebulae. Ii. Heavy-Element Depletion, J. B. Kingdon, Gary J. Ferland

Physics and Astronomy Faculty Publications

The presence of grains in gaseous nebulae can have significant effects on the thermal balance and radiative line transfer in these objects. The depletion of condensable elements onto grains provides evidence that dust exists in the ionized regions of nebulae. In this paper, we consider the elements Sc, Ti, V, and Cr, all of which are strongly depleted in the general interstellar medium. We construct simple three-level atoms for several ions of these elements, and incorporate them into our photoionization code CLOUDY. For both a model planetary nebula and a model H II region, we find that several lines of …

Backward Stimulated Raman Scattering Of A Modulated Laser Pulse In Plasmas, Nikolai E. Andreev, Serguei Y. Kalmykov

Serge Youri Kalmykov

The specific features of backward stimulated Raman scattering (BSRS) of a short modulated (multi-frequency) laser pulse in underdense plasmas are studied. The effect of resonant suppression of the BSRS of higher frequency pulse components is explored. For an arbitrary pair of pulse components, in the conditions of weak coupling, it is demonstrated that the backscattering of a higher frequency laser pulse component is a five-wave resonant process at a frequency difference between the components close to the double plasma frequency. In the conditions of strong coupling the backscattering of neither pulse component is suppressed and the spectrum of the instability …

Physical And Managed Risk Of Nuclear Waste, Lennart Sjöberg, Britt-Marie Drottz-Sjöberg

RISK: Health, Safety & Environment (1990-2002)

The authors describe their work on the perceived risk of nuclear waste in Sweden. Three levels of waste were studied, and comparisons between the perceptions of the public, politicians and nuclear experts are made.

Book Review Of Alla Yaroshinskaya, Chernobyl: The Forbidden Truth, John M. Gleason

RISK: Health, Safety & Environment (1990-2002)

Review of the book: Alla Yaroshinskaya, Chernobyl: The Forbidden Truth (Michele Kahn & Julia Sallabank, trans. University of Nebraska Press 1995). Introduction, foreword, list of illustrations, photographs. ISBN 0-8032-4912-8. [136 pp. Cloth $25.00; Paper $10.00. 312 N. 14th Street, Lincoln NE 68588-0484.]

Mr402: The Soils Of Maine, John A. Ferwerda, Kenneth J. Laflamme, Norman R. Kalloch Jr., Robert V. Rourke

Miscellaneous Reports

This report describes the soils of Maine. It includes information on soil formation, soil classification, soil map derivation, and map unit descriptions. This document file contains an 8.5X11-inch version of the general soil map of Maine. The full-size (22x33-inch) map is available in an accompanying file.

Wetland Loss In The Northern Gulf Of Mexico: Multiple Working Hypotheses, R. Eugene Turner

Faculty Publications

I examined four hypotheses about causes for the dramatically high coastal wetland losses (0.86% yr−1) in the northern Gulf of Mexico: an extensive dredged canal and spoil bank network, a decline in sediments in the Mississippi River during the 1950s, Mississippi River navigation and flood protection levees, and salinity changes. Natural factors contributing to these habitat changes include eustatic sea-level rise and geological compaction, which appear to have remained relatively constant this century, although variation does occur. These four hypotheses were tested using data on land-to-water changes in 15-min quadrangle maps inventoried for four intervals between the 1930s and 1990. …

Ergodic Control Of Reflected Diffusions With Jumps, Jose-Luis Menaldi, Maurice Robin

Mathematics Faculty Research Publications

No abstract provided.

43. Karl Kratzl, Otto Vogl

Otto Vogl

No abstract provided.

Short-Lived Intermediates In Aspartate Aminotransferase Systems, George Czerlinski, Richard Levin, Tjalling Ypma

Mathematics Faculty Publications

The kinetics of the reaction of aspartate aminotransferase with erythro-beta-hydroxy-aspartate, in which rapid mixing is followed (upon reaching a suitable stationary state) by a very fast temperature jump, is numerically simulated. Values for rate constants are used to the extent known, otherwise estimated. It is shown that reaction steps not resolvable by rapid mixing can be resolved by subsequent chemical relaxation. Since several absorption spectra of enzyme complexes overlap, use of a pH-indicator is investigated. When the pH-indicator is coupled to the protonic dissociation of free enzyme, the fast steps are easily detected in the chemical relaxation portion of the …

The Probe, Issue 174 – March 1997

The Probe: Newsletter of the National Animal Damage Control Association

Outwitting Urban Beaver, by C. E. "Ki" Faulkner, Regional Director, Region 0, NADCA
Bear Gets Attention in Southeast
Chinese disease Threatens Rabbits
Product Announcements: BEAR BE GONE™ -- a device designed to deter bears from foraging in trash cans.
Booklet: "Using Guard Animals to Protect Livestock"

Abstracts Published at the 3rd Annual Conference of The Wildlife Society:
A case study of black bear movements and survival after landfill closure in the central Adirondacks, by Ann M. Russell and S.L. Simek
Ecology of coyotes in a sheep ranching environment, by Ben N. Sacks, J.C.C. Neale, M. Jaeger, and D. R. McCullough …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 13, Number 3, March 1997, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

The Spectroscopic Orbit Of Pi Ceti, Claud H.S. Lacy, Francis C. Fekel, Robert D. Mathieu, Nidia I. Morrell, J. A. Morse, Guillermo Torres, Daryl W. Willmarth

Information Systems and Engineering Management Research Publications

π Ceti (HR 811, B7 V) has been known to be variable in its radial velocity for almost a century, but its relatively long period and small amplitude have conspired against a determination of its orbit. We have combined in an optimal fashion observations from early in this century with modern measurements to find the spectroscopic orbit with high accuracy. The orbit has a period of 7.45 years and a semiamplitude of 4.3 km/s. The measured eccentricity of e=0.00±0.07 is indistinguishable from circular, surprising for such a long period. The 76 radial velocity observations available extend over 12 cycles of …

New And Improved Parameters Of Hd 202908=Ads 14839: A Spectroscopic-Visual Triple System, Francis C. Fekel, Colin D. Scarfe, David J. Barlow, Antoine Duquennoy, Harold A. Mcalister, William I. Hartkopf, Brian D. Mason, Andrei A. Tokovinin

Information Systems and Engineering Management Research Publications

HD 202908=ADS 14839 is a spectroscopic-visual triple system consisting of three solar-type stars. Eighteen years of spectroscopic observations including coverage of the recent periastron of 1987 January plus visual and speckle observations, the latter covering roughly the same interval as the radial velocities, have been used to obtain a simultaneous three-dimensional orbital solution. The short-period pair, Aa and Ab, has an orbital period of 3.9660465 days and a small but real eccentricity of 0.0033. The visual pair, A and B, has an orbital period of 78.5 yr and an eccentricity of 0.865. The solution yields masses for all three stars …

The Elemental Composition Of Stony Cosmic Spherules, D. E. Brownlee, Beeway Bates, L. Schramm

SIAS Faculty Publications

Five hundred stony cosmic spherules collected from deep-sea sediments, polar ice, and the stratosphere have been analyzed for major and some minor element composition. Typical spherules are products of atmospheric melting of millimeter sized and smaller meteoroids. The samples are small and modified by atmospheric entry, but they are an important source of information on the composition of asteroids. The spherules in this study were all analyzed in an identical Manner, and they provide a sampling of the solar system's asteroids that is both different and less biased than provided by studies of conventional meteorites. Volatile elements such as Na …

Naturalness Lowers The Upper Bound On The Lightest Higgs Boson Mass In Supersymmetry, Greg W. Anderson, Diego Castano, Antonio Riotto

Chemistry and Physics Faculty Articles

We quantify the extent to which naturalness is lost as experimental lower bounds on the Higgs boson mass increase, and we compute the natural upper bound on the lightest supersymmetric Higgs boson mass. We find that it would be unnatural for the mass of the lightest supersymmetric Higgs boson to saturate its maximal upper bound. In the absence of significant fine-tuning, the lightest Higgs boson mass should lie below 120 GeV, and in the most natural cases it should be lighter than 108 GeV. For modest tanβ, these bounds are significantly lower. Our results imply that a failure to observe …

Quicksort Algorithm Again Revisted, Charles Knessl, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

Identification Of Spherical Virus Particles In Digitized Images Of Entire Electron Micrographs, Ioana M. Boier Martin, Dan C. Marinescu, Robert E. Lynch, Timothy S. Baker

Department of Computer Science Technical Reports

No abstract provided.

Matching For Run-Length Encoded Strings, Alberto Apostolico, Gad M. Landau, Steven Skiena

Department of Computer Science Technical Reports

No abstract provided.

Algorithms For Variable Length Subnet Address Assignment, Mikhail J. Atallah, Douglas E. Comer

Department of Computer Science Technical Reports

No abstract provided.

Comprehensive Analysis Of Joints From Patient Clinical Data, Chandrajit L. Bajaj, Fausto Bernardini, Steven M. Cutchin, Kwunnan Lin, Elisha Sacks

Department of Computer Science Technical Reports

No abstract provided.

Scientific Computing Via The World Wide Web: The Net//Ellpack Pse Server, Shahani Markus, Sanjiva Weerawarana, Elias N. Houstis, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Multiagent Systems To Support Networked Scientific Computing, Anupam Joshi, N. Ramakrishnan, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.