Physical Sciences and Mathematics | Open Access Articles

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 14, Number 8, October 1998, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

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

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Interagency Lake Mead And Las Vegas Wash Monitoring Program: Standard Operating Procedures Manual, Bureau Of Reclamation, City Of Henderson Water Reclamation Facility, City Of Las Vegas Water Pollution Control Facility, Clark County Sanitation District, Nevada, Southern Nevada Water Authority

Publications (WR)

A number of agencies sample Lake Mead and the Las Vegas Wash on a routine basis at several locations. In order to share and properly interpret the data, the Bureau of Reclamation, Southern Nevada Water Authority and the three Wastewater Treatment Facilities (City of Las Vegas, Clark County Sanitation District and City of Henderson) formed a committee to examine sampling and analytical protocols and to share information with the goal of maximizing the data quality. The group first met in April 1997. It was agreed that an effort should be made to discuss and compare specific sampling and analytical techniques …

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On The Dynamics Of Stochastic Differential Equations (Ellis B. Stouffer Colloquium, University Of Kansas), Salah-Eldin A. Mohammed

Miscellaneous (presentations, translations, interviews, etc)

We formulate and outline a proof of the Local Stable Manifold Theorem for stochastic differential equations (SDE's) in Euclidean space (joint work with M. Scheutzow). This is a central result in dynamical systems with noise. Starting with the existence of a stochastic flow for an SDE, we introduce the notion of a hyperbolic stationary trajectory. We prove the existence of invariant random stable and unstable manifolds in the neighborhood of a hyperbolic stationary solution. For Stratonovich noise, the stable and unstable manifolds are dynamically characterized using forward and backward solutions of the anticipating SDE.

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Water Current, Volume 30, No. 5, October 1998

Water Current Newsletter

Interstate Compact Opinions Vary on Summer Tour
From the Director: Unit Staff Travel to September Events; Promoting a National Water Research Initiative; State Funding Review
Volunteers Help Improve Water Quality in Elm Creek Watershed Project
Cooperation Highlights Water Quality Tour
Water Quality Monitoring Workshop Targets Nebraska and Iowa Educators
Bringing Groundwater to Life
AWRA Call for Abstracts
SNRS Debuts Seminar Series
Water News Briefs
Elm Creek Project Wraps-Up
Valuing Prairie Wetlands
Second Annual NOFEE Conference to Hastings
Strategies for Coping with Pesticide Monitoring

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Saturation In “Nonmagnetic” Stainless Steel, Christopher P. Weber, J. Fajans

Physics

Scientific equipment often uses “nonmagnetic” stainless steel, relying on the steel’s nonmagnetic behavior to leave external magnetic fields unaltered. However, stainless steel’s permeability can rise significantly when it is welded or machined, possibly perturbing an external field. Such perturbations will diminish well above the stainless steel’s saturation point. The authors measured the permeability of both welded and machined 304 stainless steel as a function of an external magnetic field, and found that both saturate at fields of approximately 0.25 T.

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Evidence Of Initial-State Two-Center Effects For (E, 2e) Reactions, Sindu P. Jones, Don H. Madison

Physics Faculty Research & Creative Works

Coincidence, or (e, 2e), measurements of electron-impact ionization of atoms have established that the largest values of triply differential cross sections are obtained in collisions involving small momentum transfer to the target. Absolute measurements for these reactions are now available for hydrogen at 54.4-eV impact energy, and relative data have recently been reported at 27.2 eV. Previous theoretical works have concentrated on employing asymptotically correct two-center wave functions for the final state, leaving the initial state described by the Born approximation. Here we report results for which asymptotically correct two-center wave functions are used for both the initial and final …

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Isophote-Based Interpolation, Bryan S. Morse, Duane Schwartzwald

Faculty Publications

Standard methods for image interpolation are based on smoothly fitting the image intensity surface. Recent edge-directed interpolation methods add limited geometric information (edge maps) to build more accurate and visually appealing interpolations at key contours in the image. This paper presents a method for geometry-based interpolation that smoothly fits the isophote (intensity level curve) contours at all points in the image rather than just at selected contours. By using level set methods for curve evolution, no explicit extraction or representation of these contours is required (unlike earlier edge-directed methods). The method uses existing interpolation techniques as an initial approximation and …

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A Note On The Green Dyadic Calculation Of The Decay Rates For Admolecules At Multiple Planar Interfaces, P.T. Leung, R. L. Hartman, Scott M. Cohen

Physics Faculty Publications and Presentations

The Green dyadic formulation for calculating classical decay rates of admolecules at multiple planar interfaces first published by Chance, Prock and Silbey is reexamined. It is pointed out that, for the case of fluorescing molecules sandwiched between a system of super- and substrate interfaces, the original formalism requires significant modifications in order to lead to results consistent with those obtained from the Sommerfeld radiation theory.

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กิจกรรมสิ่งแวดล้อม

Thai Environment

No abstract provided.

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สัมภาษณ์ : รศ. วราพรรณ ด่านอุตร : แนวทางการจัดการสารเคมีอย่างปลอดภัยในห้องปฏิบัติการ, กองบรรณาธการ

Thai Environment

No abstract provided.

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ผลกระทบของพายุไต้ฝุนนลินดาในอ่าวไทยและบริเวณชายฝั่ง, กัลยา สุนทรวงศ์สกุล, ทวีศักดิ์ ปิยะกาญจน์

Thai Environment

No abstract provided.

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โครงการติดตามคุณ่ภาพน้ำบริเวณอ่าวสัตหีบ (Sattahlp Water Quality Monitoring Program), สมมาตร์ เนียมนิล

Thai Environment

No abstract provided.

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มาตรการป้องกันเพื่อลดก๊าซเรือนกระจก, นฐปัทม์ จิตพิทักษ์

Thai Environment

No abstract provided.

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แนะนำโครงการของสถาบันวิจัยสภาวะแวดล้อม : โครงการจัดลำดับความสำคัญของปัญหาสิ่งแวดล้อม จากอุตสาหกรรมที่ควรพัฒนางานวิจัยเพื่อการแก้ไข, จันทรา ทองคำเภา

Thai Environment

No abstract provided.

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อนาคตของป่าไม้ไทยกับการพัฒนาอย่างยั่งยืน, ชัยรัตน์ วงศ์กิจรุ่งเรือง

Thai Environment

No abstract provided.

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Vegetation Analysis: A Graphical Analysis Of Plant Succession In Desert Communities Affected By Fire, Jeff Lantow

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Mojave Desert is affected by fire every year. With each fire comes the removal of old growth and, in its place, new growth – consisting primarily of those species which thrive in disturbed areas. The focus of my research is to look at plant communities that have been disturbed by fire, and examine the successional pathway of these disturbed environments. The seven environments I analyzed were burned within the last twenty years and are found in the Coleogyne ramosissima ecotone throughout the Spring Mountain range near Las Vegas, Nevada. The data was collected with randomly chosen circle plots in …

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Water Conservation In The Las Vegas Valley, Judith M. Keir

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis deals primarily with residential use of water in the Las Vegas Valley, an arid climate located in the Mojave Desert, and whether the education of people living here has any bearing on whether or not they conserve water. Many of the residents of the Las Vegas Valley have moved from other areas of the country, and perhaps are not aware of the fact that there is a limited supply of water available to the Valley. I believe that people are not necessarily wasteful, and that they would want to conserve water, if they were aware that conservation and …

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Stachybotrys: Is Nevada At Risk?, Terrylynn C. Foley

UNLV Theses, Dissertations, Professional Papers, and Capstones

Stachybotrys chartarum (atra) is a toxigenic fungus that is known to adversely impact the health of animals. Until recently, there have only been a few documented clinical reports linking Stachybotrys chartarum to human health effects. Scientists are increasingly convinced that Stachybotrys and its metabolites are responsible for several adverse health effects experienced by people all over the world, although conclusive proof has yet to be established. All the physical requirements needed for indoor Stachybotrys sporulation and growth is provided through water leaks (plumbing, roof or ceiling), flood events, nutrient sources (cellulose and nitrogen), pH, and temperature(23° - 28°C). Stachybotrys has …

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Lead Shot Concentration In Soil At The Overton Wildlife Management Area, Nevada, George R. Bertoty

UNLV Theses, Dissertations, Professional Papers, and Capstones

During the spring of 1998, soil samples were collected from two areas at the Overton Wildlife Management Area (OWMA), located in the Moapa Valley of Clark County, Nevada. Lead shot has been banned for the hunting of waterfowl since 1986 but is still legal for upland game hunting. Both types of hunting occur at OWMA. One area sampled is a cultivated field and serves primarily as a dove hunting area. The other area is primarily a waterfowl hunting area and is flooded during the waterfowl-hunting season. Lead shot was recovered from 83% of the samples from the dove hunting area, …

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A Strategic Analysis Of The Rocky Flats Cleanup, Patrick Mccann

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Rocky Flats Environmental Technology Site is located in Golden, Colorado. It is situated on 384 acres in a 6,550-acre natural preserve. Rocky Flats ended its original mission in 1989, after raids on the site by both the FBI and the EPA for illegal dumping and other environmental violations. Since then the site has been scheduled for cleanup. This thesis will provide background information on the site and on the company hired to perform the cleanup. It also provides an evaluation of some key policies regarding the cleanup procedures. Since the end of the cold war, the production of nuclear …

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Auger Resonance Decay Process In Ar 2p Shell Excitation And Ionization, Y. Lu, Wayne C. Stolte, J.A. R. Samson

Chemistry and Biochemistry Faculty Research

The production and subsequent autoionization of the Ar⁺(¹D₂)6d¹ satellite state that is formed either by shake-up or recapture during the Auger decay of a 2p vacancy in Ar has been studied by photoelectron spectroscopy in the energy region from 243 to 256 eV. The creation of near zero energy electrons below and immediately above the Ar 2p ionization threshold is discussed. Some ambiguous points in previous studies are clarified.

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Hubble Space Telescope Images And Spectra Of The Remnant Of Sn 1885 In M31, Robert A. Fesen, Christopher L. Gerardy, Kevin M. Mclin, Andrew J. S. Hamilton

Dartmouth Scholarship

Near-UV Hubble Space Telescope images of the remnant of SN 1885 (S And) in M31 show a 070±005 diameter absorption disk silhouetted against M31's central bulge, at SN 1885's historically reported position. The disk's size corresponds to a linear diameter of 2.5±0.4 pc at a distance of 725±70 kpc, implying an average expansion velocity of 11,000±2000 km s-1 over 110 yr. Low-dispersion Faint Object Spectrograph spectra over 3200-4800 Å reveal that the absorption arises principally from Ca II H and K (equivalent width 215 Å), with weaker absorption features of Ca I 4227 Å and Fe I 3720 Å. The …

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Peculiar Velocity Dipoles Of Field Galaxies, Riccardo Giovanelli, Martha P. Haynes, Wolfram Freudling, Luiz N. Da Costa, John J. Salzer, Gary Wegner

Dartmouth Scholarship

The Tully-Fisher (TF) relation is applied to obtain peculiar velocities of field spiral galaxies and to calculate dipoles of the peculiar velocity field to cz8000 km s^-1. The field galaxy sample is spatially coextensive with and completely independent of a cluster sample, for which dipole characteristics are given in a separate paper. Dipoles of the peculiar velocity field are obtained separately by applying (1) an inverse version of the TF relation and selecting galaxies by redshift windowing and (2) a direct TF relation, with velocities corrected for the inhomogeneous Malmquist bias and windowing galaxies by TF distance. …

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Complexity Reduction In State-Based Modeling, Martin Zwick

Complex Systems Faculty Publications and Presentations

For a system described by a relation among qualitative variables (or quantitative variables "binned" into symbolic states), expressed either set-theoretically or as a multivariate joint probability distribution, complexity reduction (compression of representation) is normally achieved by modeling the system with projections of the overall relation. To illustrate, if ABCD is a four variable relation, then models ABC:BCD or AB:BC:CD:DA, specified by two triadic or four dyadic relations, respectively, represent simplifications of the ABCD relation. Simplifications which are lossless are always preferred over the original full relation, while simplifications which lose constraint are still preferred if the reduction of complexity more …

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Morphogenesis Of Douglas Fir Buds Is Altered At Elevated Temperature But Not At Elevated Co2, Martha E. Apple, Melissa S. Lucash, David M. Olszyk, David T. Tingey

Environmental Science and Management Faculty Publications and Presentations

Global climatic change as expressed by increased CO₂and temperature has the potential for dramatic effects on trees. To determine what its effects may be on Pacific Northwest forests, Douglas-fir (Pseudotsuga menziesii ) seedlings were grown in sun-lit controlled environment chambers at ambient or elevated (+4°C above ambient) temperature, and at ambient or elevated (+200 ppm above ambient) CO₂. In 1995–1996 and 1996–1997, elevated CO₂ had no effect on vegetative bud morphology, while the following unusual morphological characteristics were found with greater frequency at elevated temperature than at ambient: rosetted buds with reflexed and loosened outer …

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Revegetation Strategies For Groundwater Control In The Eastern Wheatbelt, C E. Mcconnell

Resource management technical reports

No abstract provided.

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Parallel Algorithms For Maximum Matching In Complements Of Interval Graphs And Related Problems, Marilyn G. Andrews, Mikhail J. Atallah, Danny Z. Chen, D. T. Leo

Department of Computer Science Technical Reports

No abstract provided.

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Towards Performance-Driven System Support For Distributed Computing In Clustered Environments, John Cruz, Kihong Park

Department of Computer Science Technical Reports

No abstract provided.

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On The Collapse Of The Q-Gram Filtration, E. Stuinen, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

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Cohomology Of Polynomials Under An Irrational Rotation, Lawrence W. Baggett, Herbert A. Medina, Kathy D. Merrill

Mathematics, Statistics and Data Science Faculty Works

A new description of cohomology of functions under an irrational rotation is given in terms of symmetry properties of the functions on subintervals of [0, 1]. This description yields a method for passing information about the cohomology classes for a given irrational to the cohomology classes for an equivalent irrational.

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Full-Text Articles in Physical Sciences and Mathematics

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 14, Number 8, October 1998, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

Interagency Lake Mead And Las Vegas Wash Monitoring Program: Standard Operating Procedures Manual, Bureau Of Reclamation, City Of Henderson Water Reclamation Facility, City Of Las Vegas Water Pollution Control Facility, Clark County Sanitation District, Nevada, Southern Nevada Water Authority

Publications (WR)

On The Dynamics Of Stochastic Differential Equations (Ellis B. Stouffer Colloquium, University Of Kansas), Salah-Eldin A. Mohammed

Miscellaneous (presentations, translations, interviews, etc)

Water Current, Volume 30, No. 5, October 1998

Water Current Newsletter

Saturation In “Nonmagnetic” Stainless Steel, Christopher P. Weber, J. Fajans

Physics

Evidence Of Initial-State Two-Center Effects For (E, 2e) Reactions, Sindu P. Jones, Don H. Madison

Physics Faculty Research & Creative Works

Isophote-Based Interpolation, Bryan S. Morse, Duane Schwartzwald

Faculty Publications

A Note On The Green Dyadic Calculation Of The Decay Rates For Admolecules At Multiple Planar Interfaces, P.T. Leung, R. L. Hartman, Scott M. Cohen

Physics Faculty Publications and Presentations

กิจกรรมสิ่งแวดล้อม

Thai Environment

สัมภาษณ์ : รศ. วราพรรณ ด่านอุตร : แนวทางการจัดการสารเคมีอย่างปลอดภัยในห้องปฏิบัติการ, กองบรรณาธการ

Thai Environment

ผลกระทบของพายุไต้ฝุนนลินดาในอ่าวไทยและบริเวณชายฝั่ง, กัลยา สุนทรวงศ์สกุล, ทวีศักดิ์ ปิยะกาญจน์

Thai Environment

โครงการติดตามคุณ่ภาพน้ำบริเวณอ่าวสัตหีบ (Sattahlp Water Quality Monitoring Program), สมมาตร์ เนียมนิล

Thai Environment

มาตรการป้องกันเพื่อลดก๊าซเรือนกระจก, นฐปัทม์ จิตพิทักษ์

Thai Environment

Thai Environment

อนาคตของป่าไม้ไทยกับการพัฒนาอย่างยั่งยืน, ชัยรัตน์ วงศ์กิจรุ่งเรือง

Thai Environment

Vegetation Analysis: A Graphical Analysis Of Plant Succession In Desert Communities Affected By Fire, Jeff Lantow

UNLV Theses, Dissertations, Professional Papers, and Capstones

Water Conservation In The Las Vegas Valley, Judith M. Keir

UNLV Theses, Dissertations, Professional Papers, and Capstones

Stachybotrys: Is Nevada At Risk?, Terrylynn C. Foley

UNLV Theses, Dissertations, Professional Papers, and Capstones

Lead Shot Concentration In Soil At The Overton Wildlife Management Area, Nevada, George R. Bertoty

UNLV Theses, Dissertations, Professional Papers, and Capstones

A Strategic Analysis Of The Rocky Flats Cleanup, Patrick Mccann

UNLV Theses, Dissertations, Professional Papers, and Capstones

Auger Resonance Decay Process In Ar 2p Shell Excitation And Ionization, Y. Lu, Wayne C. Stolte, J.A. R. Samson

Chemistry and Biochemistry Faculty Research

Hubble Space Telescope Images And Spectra Of The Remnant Of Sn 1885 In M31, Robert A. Fesen, Christopher L. Gerardy, Kevin M. Mclin, Andrew J. S. Hamilton

Dartmouth Scholarship

Peculiar Velocity Dipoles Of Field Galaxies, Riccardo Giovanelli, Martha P. Haynes, Wolfram Freudling, Luiz N. Da Costa, John J. Salzer, Gary Wegner

Dartmouth Scholarship

Complexity Reduction In State-Based Modeling, Martin Zwick

Complex Systems Faculty Publications and Presentations

Morphogenesis Of Douglas Fir Buds Is Altered At Elevated Temperature But Not At Elevated Co2, Martha E. Apple, Melissa S. Lucash, David M. Olszyk, David T. Tingey

Environmental Science and Management Faculty Publications and Presentations

Revegetation Strategies For Groundwater Control In The Eastern Wheatbelt, C E. Mcconnell

Resource management technical reports

Parallel Algorithms For Maximum Matching In Complements Of Interval Graphs And Related Problems, Marilyn G. Andrews, Mikhail J. Atallah, Danny Z. Chen, D. T. Leo

Department of Computer Science Technical Reports

Towards Performance-Driven System Support For Distributed Computing In Clustered Environments, John Cruz, Kihong Park

Department of Computer Science Technical Reports

On The Collapse Of The Q-Gram Filtration, E. Stuinen, Wojciech Szpankowski

Department of Computer Science Technical Reports

Cohomology Of Polynomials Under An Irrational Rotation, Lawrence W. Baggett, Herbert A. Medina, Kathy D. Merrill

Mathematics, Statistics and Data Science Faculty Works