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1995

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Articles 511 - 540 of 2193

Full-Text Articles in Physical Sciences and Mathematics

Polarized Light Emission In Kev He ²⁺+Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstern, Ronald E. Olson Aug 1995

Polarized Light Emission In Kev He ²⁺+Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstern, Ronald E. Olson

Physics Faculty Research & Creative Works

We investigated l- and m-distributions of He Pi (n=4) states formed during 2-13.3 keV amu -1 He 2++Na(3s) collisions by measuring profiles and the linear polarization of the He Pi (4 to 3) emission. We found that at these energies capture into He +(4f) dominates over capture into other He +(4l) states. Over the indicated energy range the polarization of the 4He Pi (4 to 3) photon emission increases from 0.2 to 0.3 indicating a strong alignment of the captured projectile charge cloud along the internuclear axis. Due to the non-zero nuclear spin the polarization is up to 10% lower …

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Acknowledgments Aug 1995

Acknowledgments

National Wildlife Research Center Repellents Conference 1995


Committee Members
Acknowledgments

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Phononic Band Structure In A Mass Chain, Samantha Parmley, Tom Zobrist, Terry Clough, Anthony Perez-Miller, Mark Makela, Roger Yu Aug 1995

Phononic Band Structure In A Mass Chain, Samantha Parmley, Tom Zobrist, Terry Clough, Anthony Perez-Miller, Mark Makela, Roger Yu

All Faculty Scholarship for the College of the Sciences

The vibrational properties of a finite one‐dimensional string‐mass chain are studied experimentally and theoretically. In the experiment both normal mode analysis and pulse analysis are used to obtain the eigenfrequencies of the string‐mass chain. The theoretical predictions are made based upon the numerical solution to the wave equation. The phononic band structure for a periodically massed string as well as Anderson localized gap modes for a disordered system are found. The theoretical and experimental results match satisfactorily well.

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Fast Spherical Transforms On Distance Transitive Graphs, J R. Driscoll, D M. Healy Jr, D Rockmore Aug 1995

Fast Spherical Transforms On Distance Transitive Graphs, J R. Driscoll, D M. Healy Jr, D Rockmore

Computer Science Technical Reports

No abstract provided.

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Ultrastructural Immunolocalization Of Histones (H2b, H3, H4), Transition Protein (Tp1) And Protamine In Rabbit Spermatids And Spermatozoa Nuclei. Relation To Condensation Of The Chromatin, J L. Courtens, Wilson Stephen Kistler, L Plöen Aug 1995

Ultrastructural Immunolocalization Of Histones (H2b, H3, H4), Transition Protein (Tp1) And Protamine In Rabbit Spermatids And Spermatozoa Nuclei. Relation To Condensation Of The Chromatin, J L. Courtens, Wilson Stephen Kistler, L Plöen

Faculty Publications

The histones H2B, H3 and H4, the transition protein TP1 and protamine were localised using ultrastructural immunocytochemistry in nuclei of rabbit spermatids and spermatozoa. Histones are present in round spermatid nuclei and are lost during the elongation of nuclei. TP1 and protamine appear simultaneously in all nuclei during this period. TP1 is located at the periphery of chromatin cords, while protamine seems to be located at random in the same cords. TP1 is lost in most elongated sprematids during step 13 of spermiogenesis, and the protamine stays in all sperm nuclei. TP1 remains persent in some old spermatids and ejaculated …

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Combination Effects Of Irradiation And Chemical Doping On High Temperature Superconductors, Russell J. Fedewa Aug 1995

Combination Effects Of Irradiation And Chemical Doping On High Temperature Superconductors, Russell J. Fedewa

Honors Theses

The goal of this project is to investigate some methods that improve the critical transport current in high temperature superconductors. A superconductor is a material which can allow an electrical current to flow through it with no resistance. This makes them ideal for a wide variety of applications. Most of the present use is in science or medicine, and show promise in computer circuitry materials and electromagnetic trains. This experiment explores a means of increasing the critical current, the maximum amount of electric current that can pass, and which at present is too low to permit the use of superconductors …

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The Role Of Drought In Determining The Reserve Water Sector In Israel, J. A. Allan Aug 1995

The Role Of Drought In Determining The Reserve Water Sector In Israel, J. A. Allan

Drought Network News (1994-2001)

Drought is a compelling environmental phenomenon. Drought is also an extremely important feature of the political economies of dry regions. This study will emphasize the political significance of drought. Droughts, and especially protracted drought, send much stronger signals about water availability to a much more comprehensively diverse range of water interests than any other single political factor or any combination of factors operating in a political economy. Drought affects water users as well as those involved at all levels in water allocation, water legislation, and water policy development and implementation. Natural systems decree that water shortages have to be endured. …

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Five-Year Drought Continues In Spain, Antonio Mestre Barcelo Aug 1995

Five-Year Drought Continues In Spain, Antonio Mestre Barcelo

Drought Network News (1994-2001)

Spain is now facing its fifth consecutive year of severe drought. This event, which began in 1990, affects most of the country, with the exception of the north coast regions. The most affected regions are Andalucía, Extremadura, and Castilla–la Mancha, all of them located in the southern half of Spain. In some climatological stations of these areas, the five-year agricultural period from 1 September 1990 to 31 August 1995 is the driest quinquennium of this century. Mean percentage departures from normal rainfall exceed -20% in the southern half of the country and in some isolated areas of the Duero and …

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Queensland Drought Enters Its Fifth Year, Gary Bacon Aug 1995

Queensland Drought Enters Its Fifth Year, Gary Bacon

Drought Network News (1994-2001)

The worst ENSO drought event to affect the state of Queensland this century has entered its fifth year. The drought, which commenced in March 1991, reached its maximum coverage in December 1993, when 51% of the state’s 1.7 million square kilometers were officially drought-declared. Currently, 41 full shires (local authority areas) and five part shires comprising more than 20,000 individual rural properties and covering 37% of the state are drought-declared.

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Water Current, Volume 27, No. 4, August 1995 Aug 1995

Water Current, Volume 27, No. 4, August 1995

Water Current Newsletter

Tour Stresses New Technology
From the Director: Water Center Supports Groundwater Guardian
Dvorak Brings Expertise in Physical, Chemical Treatment Processes to UNL
Nebraska Water News
Festival of Color to Stress Water Quality
Missouri River Again On Endangered List
CNPP&ID Honored
Crypto Video Out
ARDC to Open House with Symposium
No New Surface Water Rights: Legislature Puts Moratorium on Water Appropriations
Issues and Alternatives, Two Publications Analyze Federal Water Legislation

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Via-Rad: A Blackboard-Based System For Diagnostic Radiology, Erika Rogers Aug 1995

Via-Rad: A Blackboard-Based System For Diagnostic Radiology, Erika Rogers

Computer Science and Software Engineering

The work described in this article presents an approach to the integration of computer displayed radiological images with cooperative computerized assistance for decision-making. The VIA-RAD system (Visual Interaction Assistant for Radiology) is a blackboard-based architecture, founded on extensive data collection and analysis in the domain of diagnostic radiology, together with cognitive modeling of the interaction between perception and problem-solving. The details of this system are presented in terms of domain knowledge representation and domain knowledge mapping. A small prototype of the system has been implemented and tested with radiology subjects, and the results of this study are also described.

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Constraints On Present-Day Basin And Range Deformation From Space Geodesy, Jeffrey Lee, Timothy H. Dixon, Stefano Robaudo, Marith C. Reheis Aug 1995

Constraints On Present-Day Basin And Range Deformation From Space Geodesy, Jeffrey Lee, Timothy H. Dixon, Stefano Robaudo, Marith C. Reheis

All Faculty Scholarship for the College of the Sciences

We use new space geodetic data from very long baseline interferometry and satellite laser ranging combined with other geodetic and geologic data to study contemporary deformation in the Basin and Range province of the western United States. Northwest motion of the central Sierra Nevada block relative to stable North America, a measure of integrated Basin and Range deformation, is 12.1±1.2 mm/yr oriented N38°W±5° (one standard error), in agreement with previous geological estimates within uncertainties. This velocity reflects both east-west extension concentrated in the eastern Basin and Range and north-northwest directed right lateral shear concentrated in the western Basin and Range. …

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Author Index Aug 1995

Author Index

National Wildlife Research Center Repellents Conference 1995

Author Index

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Chemical Signals And Repellency: Problems And Prognosis, Gary K. Beauchamp Aug 1995

Chemical Signals And Repellency: Problems And Prognosis, Gary K. Beauchamp

National Wildlife Research Center Repellents Conference 1995

The chemical senses (olfaction, gustation, and chemical irritation or pain) were likely the first to evolve. Their functions are among the most basic-to attract and to repel. Attracting compounds often signal food or sex; repelling compounds presumably signal danger. Among the chemical senses, only olfaction appears to have several functional roles, two of which are modulation of social behaviors and identification of food. Whether an odor attracts or repels often depends to a large degree on learning. Consequently, dissociated olfactory stimuli may be relatively poor candidates for repellents since, after repeated exposure, pest animals are likely to ignore them. Taste, …

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Cinnamamide: A Nonlethal Chemical Repellent For Birds And Mammals, Elaine L. Gill, Richard W. Watkins, Joanne E. Gurney, Julie D. Bishop, Chris J. Feare, Clare B. Scanlon, David P. Cowan Aug 1995

Cinnamamide: A Nonlethal Chemical Repellent For Birds And Mammals, Elaine L. Gill, Richard W. Watkins, Joanne E. Gurney, Julie D. Bishop, Chris J. Feare, Clare B. Scanlon, David P. Cowan

National Wildlife Research Center Repellents Conference 1995

There is a need for effective and environmentally sensitive methods of controlling vertebrate pest problems in agriculture and the urban environment. Nonlethal chemical repellents may meet this need where more traditional methods of control, such as scaring, shooting, and trapping, are either ineffectual or unacceptable. One such chemical repellent currently under investigation is cinnarnamide, a synthetic compound derived from a plant secondary compound, cinnamic acid. Cinnamamide is unusual because, unlike many of its contemporaries, it deters feeding by both birds and mammals. This paper reviews past and current laboratory and field studies in which cinnamarnide is shown to deter feeding …

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The Chemistry Of Plant/Animal Interactions, Paul B. Reichardt Aug 1995

The Chemistry Of Plant/Animal Interactions, Paul B. Reichardt

National Wildlife Research Center Repellents Conference 1995

Chemical approaches to studying plant/animal interactions have led to an appreciation that plant chemistry strongly influences patterns of herbivory. Although this chemistry is often rather complex, two basic factors have emerged: plant chemistry influences herbivores in both positive and negative ways by determining dietary quality of plants and by providing feeding cues. Examination of the results from numerous studies addressing these issues has led to the development of three working hypotheses: (1) there is a molecular basis for chemical cues; (2) the molecular diversity of chemical signals implies specific mechanisms for plant-initiated attraction or repellence of herbivores; and (3) there …

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Magnetic Properties Of Nanostructured Cosm/Feco Films, I.A. Al-Omari, David J. Sellmyer Aug 1995

Magnetic Properties Of Nanostructured Cosm/Feco Films, I.A. Al-Omari, David J. Sellmyer

David Sellmyer Publications

Co80Sm29/Fe65Co35 bilayer and multilayer films with Cr underlayers and overlayers have been fabricated and studied. All the samples prepared have in-plane anisotropy and the hysteresis loops were simple single loops for tFeCo≤300 Å indicating that the two phases are strongly exchange coupled. The magnetization of these samples is found to increase with increasing FeCo layer thickness for a fixed CoSm layer thickness. The coercivity, anisotropy constant, and anisotropy field for films with fixed CoSm layer thickness were found to decrease with increasing FeCo layer thickness. The magnetization squareness values of the …

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Origin Of The 〈11/20〉 Atomic Short-Range Order In Au-Rich Au-Fe Alloys, M. F. Ling, J. B. Staunton, Duane D. Johnson, F. J. Pinski Aug 1995

Origin Of The 〈11/20〉 Atomic Short-Range Order In Au-Rich Au-Fe Alloys, M. F. Ling, J. B. Staunton, Duane D. Johnson, F. J. Pinski

Duane D. Johnson

We have calculated the atomic short-range order (ASRO) and paramagnetic susceptibility in high-temperature, chemically disordered Au75Fe25 and Au90Fe10, using a density-functional-based, electronic-structure method. For both alloys, we obtain 〈11/20〉-type ASRO, in excellent agreement with experiments performed on samples that have been fast quenched from high temperature. We also identify the underlying electronic mechanism responsible for this unusual ordering behavior. During annealing at high temperatures, we suggest that aligning local moments via an external magnetic field will produce interesting AuFe alloys with 〈100〉-type ASRO.

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56. Sir Geoffrey Allan, Otto Vogl, Shigeko Suzuki Aug 1995

56. Sir Geoffrey Allan, Otto Vogl, Shigeko Suzuki

Otto Vogl

No abstract provided.

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Why The Study Of Mathematics Is One Of The Liberal Arts, David Bressoud Aug 1995

Why The Study Of Mathematics Is One Of The Liberal Arts, David Bressoud

David Bressoud

No abstract provided.

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Space-Time Characteristics Of Fragment Emission In The E/A=30 Mev 129xe + Natcu Reaction, D. R. Bowman, N. Colonna, W. A. Friedman, L. Celano, M. D'Agostino, J. D. Dinius, A. Ferrero, C. K. Gelbke, T. Glasmacher, D. O. Handzy, D. Horn, W. C. Hsi, M. Huang, I. Iori, M. A. Lisa, W. G. Lynch, G. V. Margagliotti, P. M. Milazzo, C. P. Montoya, A. Moroni, Graham F. Peaslee, L. Phair, F. Petruzzelli, R. Scardaoni, C. Schwarz, M. B. Tsang, C. Williams Aug 1995

Space-Time Characteristics Of Fragment Emission In The E/A=30 Mev 129xe + Natcu Reaction, D. R. Bowman, N. Colonna, W. A. Friedman, L. Celano, M. D'Agostino, J. D. Dinius, A. Ferrero, C. K. Gelbke, T. Glasmacher, D. O. Handzy, D. Horn, W. C. Hsi, M. Huang, I. Iori, M. A. Lisa, W. G. Lynch, G. V. Margagliotti, P. M. Milazzo, C. P. Montoya, A. Moroni, Graham F. Peaslee, L. Phair, F. Petruzzelli, R. Scardaoni, C. Schwarz, M. B. Tsang, C. Williams

Faculty Publications

Intermediate-mass-fragment emission has been studied in central E/A=30 MeV Xe129+natCu reactions. The measured fragment multiplicities, reduced-velocity correlation functions, and emission velocities have been compared with schematic three-body trajectory calculations and with three statistical models with input based upon a dynamical BNV code. The statistical models which include expansion either explicitly or implicitly are able to generate a sufficient number of fragments. The three-body trajectory calculations indicate a mean emission time of ≊200 fm/c, consistent with sequential decay. Dynamical expanding-emitting source calculations predict a similar time scale for fragment emission and give satisfactory agreement with the experimental correlation functions if the …

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Single-Layer-Coated Surfaces With Linearized Reflectance Versus Angle Of Incidence: Application To Passive And Active Silicon Rotation Sensors, R. M.A. Azzam, M. M. K. Howlader, T. Y. Georgiou Aug 1995

Single-Layer-Coated Surfaces With Linearized Reflectance Versus Angle Of Incidence: Application To Passive And Active Silicon Rotation Sensors, R. M.A. Azzam, M. M. K. Howlader, T. Y. Georgiou

Electrical Engineering Faculty Publications

A transparent or absorbing substrate can be coated with a transparent thin film to produce a linear reflectanceversus- angle-of-incidence response over a certain range of angles. Linearization at and near normal incidence is a special case that leads to a maximally flat response for p-polarized, s-polarized, or unpolarized light. For midrange and high-range linearization with moderate and high slopes, respectively, the best results are obtained when the incident light is s polarized. Application to a Si substrate that is coated with a SiO2 film leads to novel passive and active reflection rotation sensors. Experimental results and an error analysis …

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Naturalness And Superpartner Masses Or When To Give Up On Weak Scale Supersymmetry, Greg W. Anderson, Diego Castano Aug 1995

Naturalness And Superpartner Masses Or When To Give Up On Weak Scale Supersymmetry, Greg W. Anderson, Diego Castano

Chemistry and Physics Faculty Articles

Superpartner masses cannot be arbitrarily heavy if supersymmetric extensions of the standard model explain the stability of the gauge hierarchy. This ancient and hallowed motivation for weak scale supersymmetry is often quoted, yet no reliable determination of this upper limit on superpartner masses exists. In this paper we compute upper bounds on superpartner masses in the minimal supersymmetric model, and we identify which values of the superpartner masses correspond to the most natural explanation of the hierarchy stability. We compare the most natural value of these masses and their upper limits to the physics reach of current and future colliders. …

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A Greedy Algorithm For The Shortest Common Superstring Is Asymptotically Optimal, Alan Frieze, Wojciech Szpankowski Aug 1995

A Greedy Algorithm For The Shortest Common Superstring Is Asymptotically Optimal, Alan Frieze, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

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Frequency Of Pattern Occurences In A (Dna) Sequence, Mireille Régnier, Wojciech Szpankowski Aug 1995

Frequency Of Pattern Occurences In A (Dna) Sequence, Mireille Régnier, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

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Signatures: A Language Extension For Improving Type Abstraction And Subtype Polymorphism In C++, Gerald Baumgartner, Vincent R. Russo Aug 1995

Signatures: A Language Extension For Improving Type Abstraction And Subtype Polymorphism In C++, Gerald Baumgartner, Vincent R. Russo

Department of Computer Science Technical Reports

No abstract provided.

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Parallel Electronic Prototyping Of Physical Objects, Poting Wu, Elias N. Houstis Aug 1995

Parallel Electronic Prototyping Of Physical Objects, Poting Wu, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

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Peripheral Trigeminal Neural Processes Involved In Repellency, Bruce P. Bryant Aug 1995

Peripheral Trigeminal Neural Processes Involved In Repellency, Bruce P. Bryant

National Wildlife Research Center Repellents Conference 1995

his paper outlines the primary factors that affect the neural mediation of behavioral responses to chemical irritants. First, effective irritants must permeate the cornified epithelium or penetrate the mucosa to gain access to nociceptive nerve endings that are present in the skin or mucosa. Physicochemical properties of the irritant/repellent will determine the degree to which an effective concentration can be attained at the nerve endings. Second, endings of specific classes of somatosensory neurons are present in the periphery that, when appropriately stimulated by chemical as well as thermal or mechanical means, signal potential or actual tissue damage by causing pain …

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Experiments On Chemical Control Of Behavior In Brown Tree Snakes, David Chiszar, Gordon H. Rodda, Hobart M. Smith Aug 1995

Experiments On Chemical Control Of Behavior In Brown Tree Snakes, David Chiszar, Gordon H. Rodda, Hobart M. Smith

National Wildlife Research Center Repellents Conference 1995

The brown tree snake (Boiga irregularis), accidentally introduced on Guam shortly after World War 11, is the target of extensive efforts aimed at reducing populations and preventing their spread to other Pacific islands. Chemical attractants and repellents have been investigated, and this paper presents an overview of current knowledge. In particular, chemical cues that have strong effects in laboratory tests have had only modest (though significant) effects in field tests on Guam. Reasons for the different outcomes of laboratory and field studies are discussed along with recommendations for the redesign of laboratory experiments.

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A Review Of The Bird Repellent Effects Of 1 17 Carbocyclic Compounds, Larry Clark Aug 1995

A Review Of The Bird Repellent Effects Of 1 17 Carbocyclic Compounds, Larry Clark

National Wildlife Research Center Repellents Conference 1995

We evaluated 117 carbocyclic compounds for their bird repellent effects in no-choice (one-bottle) drinking tests and summarized the results in this paper. Compounds derivative of aromatic heterocycles, acetophenones and carbocyclic compounds containing sulfur are often strong repellents. Anthranilates, aromatic alcohols, aromatic aldehydes, and carbocyclic compounds containing nitrogen are moderately strong repellents. However, the potency of anthranilates is highly variable, depending upon the nature of the substitutions. Acetates and benzoates are weak repellents. Benzoic acids and amino acids are not repellent to starlings. In addition, discussions of the type of behavioral assay, units of measure, and dose-response characterizations include recommendations for …

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