Physical Sciences and Mathematics Commons^™

Understanding The Interplay Among Many Laws: 1970 To 2000, Perry R. Hagenstein

The National Forest Management Act in a Changing Society, 1976-1996: How Well Has It Worked in the Past 20 Years?: Will It Work in the 21st Century? (September 16-18)

3 pages.

Page 1 is missing.

Assessing The Need To Reform The Laws And Regulations, Perry R. Hagenstein

The National Forest Management Act in a Changing Society, 1976-1996: How Well Has It Worked in the Past 20 Years?: Will It Work in the 21st Century? (September 16-18)

2 pages.

The Failure Of Federal Land Planning, Steven P. Quarles

The National Forest Management Act in a Changing Society, 1976-1996: How Well Has It Worked in the Past 20 Years?: Will It Work in the 21st Century? (September 16-18)

26 pages.

Theoretical Analysis Of Cross Joint Geometries And Their Classification, Taixu Bai

FIU Electronic Theses and Dissertations

Joints as opening-mode fractures play important roles as indicators of tectonic stress fields and as pathways for underground fluid flow. This thesis analytically investigates the relationships among cross joint geometry, orientations and ratios of remote principal stresses, and fluid pressure. Results show that main trends of cross joints are perpendicular to the least far field stresses during cross joint formation, and cross joint paths can be used to determine relative magnitudes of remote principal stresses. Based on the theoretical derivation, cross joint geometries are grouped into five main categories: curving-parallel, curving-perpendicular, quasi-curving-parallel, quasi-curving-perpendicular and non-curving geometries. By introducing the concepts …

Physical Conditions In Low-Ionization Regions Of The Orion Nebula, J. A. Baldwin, A. Crotts, R. J. Dufour, Gary J. Ferland, S. Heathcote, J. J. Hester, K. T. Korista, P. G. Martin, C. R. O'Dell, R. H. Rubin, A. G. G. M. Tielens, D. A. Verner, D. K. Walter, Z. Wen

Physics and Astronomy Faculty Publications

We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new observations show that previous detections of [O I] 5577 were dominated by telluric emission. Our limits are consistent with a moderate density (≈ 10⁴ cm^-3) photoionized gas. We show that a previously proposed model of the Orion H II region reproduces the observed [O I] and [Fe II] spectrum. These lines are fully consistent with formation …

Observation Of Light Diffusion And Correlation Transport In Nematic Liquid Crystals, M. H. Kao, Kristen Anne Jester , '94, A. G. Yodh, Peter J. Collings

Physics & Astronomy Faculty Works

Light diffusion and temporal correlation transport are studied in an orientationally ordered multiply scattering medium. In particular, we experimentally demonstrate the anisotropic diffusion of light through a turbid nematic liquid crystal, and we measure the temporal correlations of these diffused speckle fields for the first time. The measurements are shown to provide useful information about this material, specifically the average rotational viscosity of the director. Computer simulations corroborate both the experimental observations and a more rigorous analytic theoretical formulation of this problem.

Fundamental Aspects Of Atomic Photoionization With High-Brightness Light Sources, Anthony F. Starace, Steven T. Manson

Anthony F. Starace Publications

The construction of numerous new synchrotron light sources worldwide is providing the means to study atomic and molecular photoionization processes at a level of detail that is unparalleled in even the recent past. Correspondingly, in theory, the availability of supercomputers and, perhaps more important, relatively inexpensive computer workstations, has permitted theoretical calculations to tackle more complex processes than ever before. In short, these technical developments are creating an unprecedented amount of data to be analyzed and understood.

In this volume, many of the experimental and theoretical advances of recent years will be described. We take the point of view in …

Investigation On Enantiomeric Separations Of Fluorenylmethoxycarbonyl Amino Acids And Peptides By High-Performance Liquid Chromatography Using Native Cyclodextrins As Chiral Stationary Phases, Y. Tang, J. Zukowski, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

A systematic study was carried out to investigate enantiomeric separations of fluorenylmethoxycarbonyl (FMOC) amino acids and their peptides. Twenty amino acids were derivatized by 9-fluorenylmethyl chloroformate (FMOC-Cl) and its analogues, FMOC-glycyl-Cl and FMOC-β-alanyl-Cl. All derivatives were chromatographed on native β- and γ-cyclodextrin columns using acetonitrile as the main mobile phase component. The results indicated that glycyl and β-alanyl groups between FMOC and amino acid moieties enhanced chiral selectivities of amino acid derivatives. The addition of modifiers, triethylamine, acetic acid and methanol, into the mobile phase caused alterations in retention, enantiorecognition and elution order. The structures of amino acids and the …

Ground-State Roughness Of The Disordered Substrate And Flux Line In D=2, Alan Middleton, Chen Zeng, Y. Shapir

Physics - All Scholarship

We apply optimization algorithms to the problem of finding ground states for crystalline surfaces and flux lines arrays in presence of disorder. The algorithms provide ground states in polynomial time, which provides for a more precise study of the interface widths than from Monte Carlo simulations at finite temperature. Using $d=2$ systems up to size $420^2$, with a minimum of $2 \times 10^3$ realizations at each size, we find very strong evidence for a $\ln^2(L)$ super-rough state at low temperatures.

High-Power Broadly Tunable Picosecond Ir Laser System For Use In Nonlinear Spectroscopic Applications, D. E. Gragson, B. M. Mccarty, G. L. Richmond, D. S. Alavi

Chemistry and Biochemistry

We developed a high-power tunable picosecond IR laser system suitable for nonlinear spectroscopic investigations. We employ a Ti:sapphire regenerative amplifier that produces 1.9-ps, 17-cm⁻¹, 800-nm pulses at 1 kHz as a pump source. White-light generation in ethylene glycol and optical parametric amplification in potassium titanyl phosphate are used to produce the IR pulses. The tuning range extends from 2.4 to 3.8 μm in the idler and 1.0 to 1.2 μm in the signal. A total efficiency (signal plus idler) as high as 20% was achieved. The spatial, spectral, and temporal characteristics of the IR beam are presented along …

Does Risk Aversion Make A Case For Conservatism, Ralph M. Perhac Jr.

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

Dr. Perhac argues that risk aversion, alone, and assuming it is justifiable, does not support the prefer ability of overstating, as opposed to understating, mean risk.

Comparing Risks Thoughtfully, Adam M. Finkel

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

Dr. Finkel argues that comparing risks is neither impossible nor immoral - but is nonetheless very difficult. He then discusses two major pitfalls of making such comparisons, one commonly cited and one routinely ignored, before sketching a framework for improving them.

Review Of: Robert M. Hardaway, Population, Law, And The Environment (Praeger 1994), Carey Ann Zadra

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

Review of the book: Robert M. Hardaway, Population, Law, and the Environment (Praeger 1994). About the author, acknowledgements, index, notes, preface, selected bibliography. LC-93-44501; ISBN 0-275-94570-7 [188 pp. $55.00 Cloth. 88 Post Road West, Westport CT 06881.]

Review Of: Ike Jeanes, Forecast And Solution - A Trilogy For Everyone Grappling With The Nuclear (Pocahontas Press 1996), Drew Schaefer

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

Review of the book: Ike Jeanes, Forecast and Solution - A Trilogy for Everyone Grappling with the Nuclear (Pocahontas Press 1996). Addenda, appendix, figures, front matter, notes, references, tables. ISBN 0-936015-62-4 [800 pp. Cloth $32.00; paper $25.00. P.O. Drawer F, Blacksburg VA 24063-1020.]

Depletion Of Atmospheric Nitrate And Chloride As A Consequence Of The Toba Volcanic Eruption, Q. Yang, Paul Andrew Mayewski, G. A. Zielinski, M. Twickler, K. C. Taylor

Earth Science Faculty Scholarship

Continuous measurements of SO₄²⁻ and electrical conductivity (ECM) along the GISP2 ice core record the Toba mega‐eruption at a depth 2590.95 to 2091.25 m (71,000±5000 years ago). Major chemical species were analyzed at a resolution of 1 cm per sample for this section. An ∼6‐year long period with extremely high volcanic SO₄²⁻ coincident with a 94% depletion of nitrate and 63% depletion of chloride is observed at the depth of the Toba horizon. Such a reduction of chloride in a volcanic layer preserved in an ice core has not been observed in any previous studies. The …

Relationship Between Continuous Aerosol Measurements And Firn Core Chemistry Over A 10‐Year Period At The South Pole, M. H. Bergin, E. A. Meyerson, J. E. Dibb, Paul Andrew Mayewski

Earth Science Faculty Scholarship

Before ice core chemistry can be used to estimate past atmospheric chemistry it is necessary to establish an unambiguous link between concentrations of chemical species in the air and snow. For the first time a continuous long‐term record of aerosol properties (aerosol light scattering coefficient, σ_sp , and Ångström exponent, å) at the South Pole are compared with the chemical record from a high resolution firn core (∼10 samples per year) covering the period from 1981 to 1991. Seasonal signals in å, associated with winter minima due to coarse mode seasalt and summer maxima due to accumulation mode sulfate …

Rate Coefficients For Charge Transfer Between Hydrogen And The First 30 Elements, J. B. Kingdon, Gary J. Ferland

Physics and Astronomy Faculty Publications

We present analytic fits to charge exchange rate coefficients over the full range of temperatures which occurs in photoionized or shock-heated plasmas. We consider reactions between neutral hydrogen and all elements with parent ion charge q = 1-4 up to Z = 30. Many rates were obtained from various sources in the literature. For reactions for which no data were available, we calculated rates using the Landau-Zener formalism. For these new reactions, we tabulate both total and state-specific rate coefficients. Ml are fitted with a consistent, accurate formula. These fits may be incorporated easily into spectral synthesis codes, and we …

Review Of Dark Sun: The Making Of The Hydrogen Bomb By Richard Rhodes, David W. Hafemeister

Physics

No abstract provided.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 12, Number 7, September 1996, 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.

Reproductive Success Of Grasshopper Sparrows In Relation To Edge, Jennifer M. Delisle, Julie A. Savidge

School of Natural Resources: Faculty Publications

Using an index based on observations of breeding behaviors, we estimated reproductive success of 31 territorial grasshopper sparrows (Ammodramus savannarum) on Conservation Reserve Program fields in southeast Nebraska. Reproductive success was 52%, and no difference was detected between birds holding interior (>100 m from the edge) vs. edge territories. However, grasshopper sparrows appeared to avoid nesting within 50 m of edge habitats. Territories ranged from 0.36-1.24 ha, and territory size did not differ between successful and unsuccessful males.

The Probe, Issue 169 – September 1996

The Probe: Newsletter of the National Animal Damage Control Association

Bird Strike!, by James E. Forbes, Chairman, Bird Strike Committee-USA and Past President, NADCA
NADCA Names Its Regions
Kevin Sullivan New RD – Western Region
Bob Reynolds Retires
Call for Papers--13th Great Plains Wildlife Damage Control Workshop
Vultures Attack Florida Building
Newsman Sam Donaldson is receiving criticism for calling on ADC to assist in controlling predators on his New Mexico sheep ranch.
Wolf Reintroduction Plans for '97 Announced
House Kills Anti-ADC Amendment
Galapagos to Eradicate Feral Animals
"Handbook" Really Gets Around
Ferries Grapple with Pigeon Nuisance
Video and Publications Review: Fur Institute of Canada's educational materials on the fur trade

Magnetization Reversal Behavior In Cobalt Rare-Earth Thin Films, S.S. Malhotra, Z.S. Shan, D.C. Stafford, Sy_Hwang Liou, David J. Sellmyer

David Sellmyer Publications

Cobalt RareEarth (CoR, R = Pr,Sm) thin films on a Cr underlayer have shown promise as future ultra high density magnetic recording media. The activation volume or the magnetic switching volume (v*) is an important consideration for thermal stability and media noise in high density recording media and V* can also provide information about the magnetization reversal behavior in these films. The magnetic switching volume was estimated for the CoPr films with thicknesses from 28 to 639 nm with a Cr underlayer of 80 nm annealed at 500 ⁰C. The measured switching volume ranges from 1.3 to 1.7x10^{-18 …}

Doubly Differential Cross Sections Of Low-Energy Electrons Emitted In The Ionization Of Molecular Hydrogen By Bare Carbon Ions, Lokesh C. Tribedi, P. Richard, D. Ling, Y. D. Wang, C. D. Lin, R. Moshammer, G. W. Kerby Iii, M. W. Gealy, M. Eugene Rudd

M. Eugene Rudd Publications

We have measured the double differential cross sections (DDCS) (d²σ/dε_edΩ^e) of low-energy electron emission in the ionization of H₂ bombarded by bare carbon ions of energy 30 MeV. The energy and angular distributions of the electron DDCS have been obtained for 12 different emission angles and for electron energies varying between 0.1 and 300 eV. We have also deduced the single differential and total ionization cross section from the measured DDCS. The data have been compared with the predictions of first Born approximations and the CDW-EIS (continuum distorted wave–eikonal …

Kompleksowa Ocena Jakości Powietrza W Nowym Sączu Przy Pomocy Metody Obliczeniowo-Pomiarowej, Marian Mazur, Marek Bogacki, Robert Oleniacz

Robert Oleniacz

The paper presents the results of a comprehensive assessment of air pollution in the city of Nowy Sącz (Poland). This involved determining the emissions of selected pollutants from various sources with their percentages of the total emission and immission on the area under consideration. As a result of measurement of concentrations of particulate matter and benzo(a)pyrene in several parts of the city were verified results of theoretical calculations and determined the size of the inflow of pollutants from outside the area in question.

English title: A comprehensive assessment of air quality in Nowy Sącz using computational and measuring methods.

Prognozowanie Wpływu Motoryzacji Na Poziom Stężenia Ozonu W Przyziemnej Warstwie Atmosfery, Marek Bogacki, Marian Mazur, Robert Oleniacz

Robert Oleniacz

The paper presents an approach for assessing the impact of road transport on the level of ozone concentrations in the ground layer of the atmosphere. The developed method consists in emission inventory on the analyzed area for road transport and calculations using the model of chemical reactions in the troposphere.

Using this method it is possible to display waveforms daily ozone concentrations in the air, and evaluate the effectiveness of the decisions related to the prevention of occurrence of photochemical smog in urban and industrial agglomerations.

English title: Predicting the impact of motoring on the level of ozone concentration in …

International Symposium On Macromolecular Architecture, Otto Vogl, Tatsuki Kitayama

Otto Vogl

No abstract provided.

48. Junji Furukawa, Otto Vogl

Otto Vogl

No abstract provided.

Existence And Bifurcation Of The Positive Solutions For A Semilinear Equation With Critical Exponent, Yinbin Deng, Yi Li

Yi Li

In this paper, we consider the semilinear elliptic equation[formula]Forp=2N/(N−2), we show that there exists a positive constantμ*>0 such that (∗)_μpossesses at least one solution ifμ∈(0, μ*) and no solutions ifμ>μ*. Furthermore, (∗)_μpossesses a unique solution whenμ=μ*, and at least two solutions whenμ∈(0, μ*) and 2<NN⩾6, under some monotonicity conditions onf((1.6)) we show that there exist two constants 0<μ_**⩽μ**<μ* such that problem (∗)_{μ …}

Physical Modeling For Interaction In Real-Time Simulation, Curtis Lisle

Link Foundation Modeling, Simulation and Training Fellowship Reports

The goal of this project was to model objects in a simulated environment with a method which allows physically-correct behavior to be calculated in real-time. Our approach studied the interaction between differing object types and used object-oriented software design to create a class hierarchy of objects suitable for interactive speed virtual environment simulation. We studied physical modeling systems and constraint systems as techniques to control the behavior of objects in our simulations. We also studied two different ways to achieve distributed execution of an object-oriented simulation. In our first approach, we designed a set of simulation software which ran built …

Early Experiences In Evaluating The Parallel Disk Model With The Vic* Implementation, Thomas H. Cormen, Melissa Hirschl

Computer Science Technical Reports

Although several algorithms have been developed for the Parallel Disk Model (PDM), few have been implemented. Consequently, little has been known about the accuracy of the PDM in measuring I/O time and total time to perform an out-of-core computation. This paper analyzes timing results on a uniprocessor with several disks for two PDM algorithms, out-of-core radix sort and BMMC permutations, to determine the strengths and weaknesses of the PDM. The results indicate the following. First, good PDM algorithms are usually not I/O bound. Second, of the four PDM parameters, two (problem size and memory size) are good indicators of I/O …