# Physical Sciences and Mathematics Commons™

Articles 1 - 30 of 2011

## Full-Text Articles in Physical Sciences and Mathematics

The Neutralino Sector In Strongly Interacting Supersymmetric Models, Tonnis Ter Veldhuis Dec 1994

#### The Neutralino Sector In Strongly Interacting Supersymmetric Models, Tonnis Ter Veldhuis

##### Tonnis ter Veldhuis

No abstract provided.

Critical Dynamics Of Nonconserved Ising-Like Systems, K. E. Bassler, Beate Schmittmann Dec 1994

#### Critical Dynamics Of Nonconserved Ising-Like Systems, K. E. Bassler, Beate Schmittmann

##### Beate Schmittmann

We show that the dynamical fixed point of Ising-like models, characterized by a single scalar, nonconserved ordering field, is stable near four dimensions with respect to all dynamic perturbations, including those of a nonequilibrium nature.

Collective Expansion In Central Au+Au Collisions, W. C. Hsi, G. J. Kunde, J. Pochodzalla, W. G. Lynch, M. B. Tsang, M. L. Begemann-Blaich, D. R. Bowman, R. J. Charity, F. Cosmo, A. Ferrero, C. K. Gelbke, T. Glasmacher, T. Hofmann, G. Imme, I. Iori, J. Hubele, J. Kempter, P. Kreutz, W. D. Kunze, V. Lindenstruth, M. A. Lisa, U. Lynen, M. Mang, A. Moroni, W. F.J. Müller, M. Neumann, B. Ocker, C. A. Ogilvie, Graham F. Peaslee, G. Raciti, F. Rosenberger, H. Sann, R. Scardaoni, A. Schüttauf, C. Schwarz, W. Seidei, V. Serfling, L. G. Sobotka Dec 1994

#### Collective Expansion In Central Au+Au Collisions, W. C. Hsi, G. J. Kunde, J. Pochodzalla, W. G. Lynch, M. B. Tsang, M. L. Begemann-Blaich, D. R. Bowman, R. J. Charity, F. Cosmo, A. Ferrero, C. K. Gelbke, T. Glasmacher, T. Hofmann, G. Imme, I. Iori, J. Hubele, J. Kempter, P. Kreutz, W. D. Kunze, V. Lindenstruth, M. A. Lisa, U. Lynen, M. Mang, A. Moroni, W. F.J. Müller, M. Neumann, B. Ocker, C. A. Ogilvie, Graham F. Peaslee, G. Raciti, F. Rosenberger, H. Sann, R. Scardaoni, A. Schüttauf, C. Schwarz, W. Seidei, V. Serfling, L. G. Sobotka

##### Faculty Publications

Energy spectra for intermediate mass fragments produced in central Au + Au collisions at EA=100 MeV indicate a collective expansion at breakup. For the first time, values for this collective expansion energy per nucleon are extracted independently for each charge. Typically, these values are one-third to one-half of the incident kinetic energy per nucleon in the c.m. system, but they decrease with Zf, suggesting that all fragments do not participate equally in the collective expansion.

Quo Vadis-A Framework For Intelligent Routing In Large Communication Networks., Armin Mikler, Johnny S. Wong, Vasant Honavar Dec 1994

#### Quo Vadis-A Framework For Intelligent Routing In Large Communication Networks., Armin Mikler, Johnny S. Wong, Vasant Honavar

##### Computer Science Technical Reports

This paper presents Quo Vadis, an evolving framework for intelligent traffic management in very large communication networks. Quo Vadis is designed to exploit topological properties of large networks as well as their spatio-temporal dynamics to optimize multiple performance criteria through cooperation among nodes in the network. It employs a distributed representation of network state information using local load measurements supplemented by a less precise global summary. Routing decisions in Quo Vadis are based on parameterized heuristics designed to optimize various performance metrics in an anticipatory or pro-active as well as compensatory or reactive mode and to minimize the overhead associated ...

Formation Of Shape-Preserving Pulses In A Nonlinear Adiabatically Integrable System, R. Grobe, Foek T. Hioe, J. H. Eberly Dec 1994

#### Formation Of Shape-Preserving Pulses In A Nonlinear Adiabatically Integrable System, R. Grobe, Foek T. Hioe, J. H. Eberly

##### Physics Faculty/Staff Publications

No abstract provided.

Parametric Micro-Level Performance Models For Parallel Computing, Youngtae Kim, Mark Fienup, Jeffrey S. Clary, Suresh C. Kothari Dec 1994

#### Parametric Micro-Level Performance Models For Parallel Computing, Youngtae Kim, Mark Fienup, Jeffrey S. Clary, Suresh C. Kothari

##### Computer Science Technical Reports

Parametric micro-level (PM) performance models are introduced to address the important issue of how to realistically model parallel performance. These models can be used to predict execution times, identify performance bottlenecks, and compare machines. The accurate prediction and analysis of execution times is achieved by incorporating precise details of interprocessor communication, memory operations, auxiliary instructions, and effects of communication and computation schedules. Parameters are used for flexibility to study various algorithmic and architectural issues. The development and verification process, parameters and the scope of applicability of these models are discussed. A coherent view of performance is obtained from the execution ...

Fragmentation Of Necklike Structures, C. P. Montoya, W. G. Lynch, D. R. Bowman, Graham F. Peaslee, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, L. Phair, M. B. Tsang, J. B. Webster, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto Dec 1994

#### Fragmentation Of Necklike Structures, C. P. Montoya, W. G. Lynch, D. R. Bowman, Graham F. Peaslee, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, L. Phair, M. B. Tsang, J. B. Webster, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto

##### Faculty Publications

Intermediate mass fragment (IMF: 3≤Z≤20 emission from necklike structures joining projectilelike and targetlike residues has been observed for peripheral Xe129 + Cunat collisions at EA=50 MeV. These fragments are emitted primarily at velocities between those of the projectilelike and targetlike residues. Relative to the charge distribution of fragments evaporated from projectilelike residues, the distribution for "neck" emission shows an enhanced emission for fragments with 4≤ZIMF≤12. This feature is consistent with expectations for the fragmentation of a noncompact cylindrical configuration.

Dec 1994

#### Polymer Institute Slovak Academy Of Sciences Bratislava, Slovakia, Otto Vogl

##### Emeritus Faculty Author Gallery

No abstract provided.

Sixth U.S.-Japan Seminar On Polymer Synthesis: Macromolecular Design For Advanced Materials, Otto Vogl, Shiro Kobayashi Dec 1994

#### Sixth U.S.-Japan Seminar On Polymer Synthesis: Macromolecular Design For Advanced Materials, Otto Vogl, Shiro Kobayashi

##### Emeritus Faculty Author Gallery

No abstract provided.

64. Tibor Kelen, Otto Vogl Dec 1994

#### 64. Tibor Kelen, Otto Vogl

##### Emeritus Faculty Author Gallery

No abstract provided.

Kinetics Of Clustering In Traffic Flows, E. Ben-Naim, P. L. Krapivsky, S. Redner Dec 1994

#### Kinetics Of Clustering In Traffic Flows, E. Ben-Naim, P. L. Krapivsky, S. Redner

##### Eli Ben-Naim

We study a simple aggregation model that mimics the clustering of traffic on a one-lane roadway. In this model, each car'' moves ballistically at its initial velocity until it overtakes the preceding car or cluster. After this encounter, the incident car assumes the velocity of the cluster which it has just joined. The properties of the initial distribution of velocities in the small velocity limit control the long-time properties of the aggregation process. For an initial velocity distribution with a power-law tail at small velocities, $\pvim$ as $v \to 0$, a simple scaling argument shows that the average cluster size ...

Low-Energy Differential Scattering Of Electrons And Positrons From Noble Gases, David D. Reid, J. M. Wadehra Dec 1994

#### Low-Energy Differential Scattering Of Electrons And Positrons From Noble Gases, David D. Reid, J. M. Wadehra

##### Physics and Astronomy Faculty Research Publications

Calculations of cross sections for electron (e) and positron (e+) scattering from ground-state He, Ne, Ar, Kr, and Xe at projectile energies below the lowest inelastic thresholds are presented. The main focus in the present work is on the differential cross sections, since angular distributions depend sensitively on the choice of interaction potentials used in the calculations. A part of the interaction potential used in the calculations includes a parameter-free correlation-polarization potential which is (a) based on physical ideas of what a correlation-polarization potential should be, (b) different for various target gases, and (c) distinct for electron and positron scattering ...

#### The Probe, Issue # 150 -- December 1994

##### The Probe: Newsletter of the National Animal Damage Control Association

Raccoon Rabies Epizootic - United States 1993
Translocation of Wild Canids Brings Disease Threats
California Assemblyman Says "Time to Repeal Mountain Lion Initiative"
Call for Nominations for Beiryman Institute Awards
Well! At Least We Told 'Em How It Is (1980 article), by George S. Rost

Energy Spread And Ion Current Measurements Of Several Ion Sources, A. D. Gaus, W. T. Htwe, J. A. Brand, Timothy J. Gay, M. Schulz Dec 1994

#### Energy Spread And Ion Current Measurements Of Several Ion Sources, A. D. Gaus, W. T. Htwe, J. A. Brand, Timothy J. Gay, M. Schulz

##### Timothy J. Gay Publications

Energy spread and extracted current measurements are presented for five different types of ion sources: hot cathode, cold cathode, magnetron, microwave, and electron cyclotron resonance (ECR). The measurements were performed with a 45° parallel-plate energy analyzer with a resolution of better than 0.5 eV at 500 eV incident energy. Energy spreads ranged from 0.5 to 4 eV, while total extracted beam currents ranged from 2 to 30 μA. Beam currents due specifically to protons, 3He++ ions, and H+2 ions are also presented. The ECR and magnetron sources gave the best overall performance. These, along with the ...

Optical-Fiber Preamplifiers For Ladar Detection And Associated Measurements For Improving The Signal-To-Noise Ratio, Michael S. Salisbury, Paul F. Mcmanamon, Bradley D. Duncan Dec 1994

#### Optical-Fiber Preamplifiers For Ladar Detection And Associated Measurements For Improving The Signal-To-Noise Ratio, Michael S. Salisbury, Paul F. Mcmanamon, Bradley D. Duncan

##### Electro-Optics and Photonics Faculty Publications

In an effort to increase achievable postdetection signal-tonoise ratios (SNRs) of continuous-wave, 1-gm all-solid-state ladar systems, a prototype rare-earth-doped optical-fiber amplifier has been included in the optical return signal path of both a heterodyne and a directdetection ladar system. We provide numerical predictions for SNR increases according to our previously developed theory. We also detail our experimental efforts and provide the results of SNR measurements for four distinct cases: direct ladar detection with and without a fiber amplifier, and heterodyne ladar detection with and without a fiber amplifier. Experimentally measured increases in SNRs for ladar systems incorporating an optical-fiber amplifier ...

Native Vegetation Handbook For The Shire Of York, Sarah J. Weaving Dec 1994

#### Native Vegetation Handbook For The Shire Of York, Sarah J. Weaving

##### Native vegetation handbook series

This booklet provides rural communities with information relating to the natural resources of the Shire of York including the original and existing vegetation, fauna and flora, drainage systems, topography and soils. Some of the problems relating to the management of natural vegetation resources in the Shire of York and community initiatives to address these problems are also discussed. It is hoped that this information will contribute to the long term viability of the agricultural landscape and the conservation of native vegetation within the Shire.

Native Vegetation Handbook For The Shire Of Merredin, Sarah J. Weaving Dec 1994

#### Native Vegetation Handbook For The Shire Of Merredin, Sarah J. Weaving

##### Native vegetation handbook series

This booklet provides land managers with information relating to the natural resources of the Shire of Merredin including the existing vegetation, drainage systems and soils. Some of the problems relating to the management of natural vegetation resources in the Shire of Merredin and possible solutions to these problems are also discussed. Provision of this information will contribute to the long term viability of the agricultural landscape and the conservation of native vegetation within the Shire.

#### Water Current, Volume 26, No. 6, December 1994

Waste Management Problem Focus of '95 Seminars
From the Director
Policies Topic of '95 Conference
Glossary of Water-Related Terms
Researchers Try to Outsmart Hardy Pests
Reflections on a Year Well Spent
Scientific Conference "In the Bush"
Symposium Spurs Water Discussion

Do Microplates In Subduction Zones Leave A Geological Record?, Jeffrey Lee, Joann M. Stock Dec 1994

#### Do Microplates In Subduction Zones Leave A Geological Record?, Jeffrey Lee, Joann M. Stock

##### All Faculty Scholarship for the College of the Sciences

Active microplate boundaries in ocean-continent subduction zones may induce deformation of the overlying plate and spatial or geochemical variations in the volcanic arc. We discuss two modern cases. The first is the South Gorda-Juan de Fuca plate boundary in the Cascadia subduction zone, where there is little or no effect on the overriding plate and the oceanic plate takes up much of the deformation. The second case is the Cocos-Rivera plate boundary in the Middle America trench, where the overlying Colima graben contains substantial deformation in a zone extending from the trench to the volcanic arc and the sub-duction-related volcanism ...

Square Roots Of Finite Groups - Ii, Matthew Devos, David Mcadams, Rebecca Rapoport Dec 1994

#### Square Roots Of Finite Groups - Ii, Matthew Devos, David Mcadams, Rebecca Rapoport

##### Mathematical Sciences Technical Reports (MSTR)

A subset R of a finite group G is a square root of G if R2 = G. If R is a square root of G for which |R|2 = G, then R is referred to as a perfect square root of G. It can be shown using character theory that perfect square roots do not exist. The purpose of this paper is to work toward an elementary proof of this result.

Distinct Products Of Triples In Finite Groups, Curtis Z. Mitchell Dec 1994

#### Distinct Products Of Triples In Finite Groups, Curtis Z. Mitchell

##### Mathematical Sciences Technical Reports (MSTR)

Let G be a finite group and let Di(G) be the proportion of triples ( x , y , z ) of elements in G such that the cardinality of { xyz , xzy , yxz, yzx , zxy , zyx } is i. In this paper we show that:

i) The average value of Di is either 1 or at least 53/32.

ii) D2= 0 ==> D3 = D4 = D5 = D6 = 0;

iii) D3= 0 ==> D4 = D5 = 0

Converted Railroad Corridors As Avian Habitat In Southeast Nebraska, Kevin L. Poague Dec 1994

#### Converted Railroad Corridors As Avian Habitat In Southeast Nebraska, Kevin L. Poague

##### Dissertations & Theses in Natural Resources

No abstract provided.

Portable, High-Bandwidth Frequency-Domain Photon Migration Instrument For Tissue Spectroscopy, Steen J. Madsen, Eric R. Anderson, Richard C. Haskell, Bruce J. Tromberg Dec 1994

#### Portable, High-Bandwidth Frequency-Domain Photon Migration Instrument For Tissue Spectroscopy, Steen J. Madsen, Eric R. Anderson, Richard C. Haskell, Bruce J. Tromberg

##### All HMC Faculty Publications and Research

We describe a novel frequency-domain photon migration instrument employing direct diode laser modulation and avalanche photodiode detection, which is capable of noninvasively determinating the optical properties of biological tissues in near real time. An infinite medium diffusion model was used to extract absorption and transport scattering coefficients from 300-kHz to 800-MHz photon-density wave phase data. Optical properties measured in tissue-simulating solutions at 670 nm agreed to within 10% of those expected.

Topologies Invariant Under A Group Action, Paul Bankston Dec 1994

#### Topologies Invariant Under A Group Action, Paul Bankston

##### Mathematics, Statistics and Computer Science Faculty Research and Publications

We study links between faithful group actions on a set and topologies on that set. In one direction, a group action has its invariant topologies (so we may regard members of the action to be homeomorphisms relative to those topologies); in the other direction, a topology has its preserving group actions (i.e., the subgroups of the homeomorphism group of the topology). This two-way passage allows us to discuss topological features of group actions as well as symmetry features of topologies.

Electron-Beam-Induced Patterned Deposition Of Allylcyclopentadienyl Palladium Using Scanning Tunneling Microscopy, D.S. Saulys, A. Ermakov, E.L. Garfunkel, Peter A. Dowben Dec 1994

#### Electron-Beam-Induced Patterned Deposition Of Allylcyclopentadienyl Palladium Using Scanning Tunneling Microscopy, D.S. Saulys, A. Ermakov, E.L. Garfunkel, Peter A. Dowben

##### Peter Dowben Publications

Scanning tunneling microscopy has been used to study the electron-induced decomposition of allylcyclopentadienyl palladium [Pd(η3-C3H5)( η5-C5H5)] and subsequent deposition on a Si(111) surface. Deposition occurs via an electron impact mechanism on either the tip or surface, depending on the bias polarity, and is observed with voltages of 2.75 V. This is close to the predicted condensed phase dissociation energy of 2.3 eV for Pd(η3-C3H5)(η5-C5H5)→Pd+C3H5+C5H5. Metallic ...

Stream Of Consciousness (1994), Alliance For Aquatic Resource Monitoring (Allarm) Dec 1994

#### Stream Of Consciousness (1994), Alliance For Aquatic Resource Monitoring (Allarm)

##### Stream of Consciousness

Stream of Consciousness is a publication from the Alliance for Aquatic Resource Monitoring (ALLARM) at Dickinson College.

ALLARM Awarded Matching Funds Grant by The National Environment Education and Training Foundation (NEETF) / by Stefanie Comastro

Keeping Up with SMART / by Jonathan Cox

Volunteer Spotlight: George Walthour / by Melissa Russo

The Campaign for Clean Air Continues in the Commonwealth of Pennsylvania / by Stefanie Comastro

ALLARM's 1994 Fall Board Meeting and General Workshop / by Todd Schively

What Can You Do to Help the Environment in 1995?

ALLARM To Start Its New Watershed Initiative With A Spring Training Workshop

Meet ...

Discrete Symmetries And Isosinglet Quarks In Low-Energy Supersymmetry, Diego Castano, Stephan P. Martin Dec 1994

#### Discrete Symmetries And Isosinglet Quarks In Low-Energy Supersymmetry, Diego Castano, Stephan P. Martin

##### Chemistry and Physics Faculty Articles

Many extensions of the minimal supersymmetric standard model contain superfields for quarks which are singlets under weak isospin with electric charge -13. We explore the possibility that such isosinglet quarks have low or intermediate scale masses, but do not mediate rapid proton decay because of a discrete symmetry. By imposing the discrete gauge anomaly cancellation conditions, we show that the simplest way to achieve this is to extend the Z3 “baryon parity” of Ibáñez and Ross to the isosinglet quark superfields. This can be done in three distinct ways. This strategy is not consistent with grand unification with a ...

Geology Newsletter- 1994, Department Of Geology Dec 1994

#### Geology Newsletter- 1994, Department Of Geology

##### Geological and Environmental Sciences News

Vol. 1, No. 19

• Faculty News
• Awards and Scholarships
• Alumni/ Friends/ Former Faculty Notes
• Geology Development and Scholarship Donations

John Muir Newsletter, Winter 1994/1995, John Muir Center For Regional Studies Dec 1994