Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

189,871 Full-Text Articles 231,139 Authors 47,230,550 Downloads 392 Institutions

All Articles in Physical Sciences and Mathematics

Faceted Search

189,871 full-text articles. Page 4686 of 5003.

Discrete Groups And The Complex Contact Geometry Of Sl(2, C), Brendan Foreman 2010 John Carroll University

Discrete Groups And The Complex Contact Geometry Of Sl(2, C), Brendan Foreman

Mathematics and Computer Science

We investigate the vertical foliation of the standard complex contact structure on Γ \ Sl(2, C), where Γ is a discrete subgroup. We find that, if Γ is nonelementary, the vertical leaves on Γ \ Sl(2, C) are holomorphic but not regular. However, if Γ is Kleinian, then Γ \ Sl(2, C) contains an open, dense set on which the vertical leaves are regular, complete and biholomorphic to C ∗. If Γ is a uniform lattice, the foliation is nowhere regular, although there are both infinitely many compact and infinitely many nonclosed leaves.


Maintaining Recursive Views Of Regions And Connectivity In Networks, Mengmeng Liu, Nicholas E. Taylor, Wenchao Zhou, Zachary G. Ives, Boon Thau Loo 2010 University of Pennsylvania

Maintaining Recursive Views Of Regions And Connectivity In Networks, Mengmeng Liu, Nicholas E. Taylor, Wenchao Zhou, Zachary G. Ives, Boon Thau Loo

Departmental Papers (CIS)

The data management community has recently begun to consider declarative network routing and distributed acquisition: e.g., sensor networks that execute queries about contiguous regions, declarative networks that maintain shortest paths, and distributed and peer-to-peer stream systems that detect transitive relationships among data at the distributed sources. In each case, the fundamental operation is to maintain a view over dynamic network state. This view is typically distributed, recursive, and may contain aggregation, e.g., describing shortest paths or least costly paths. Surprisingly, solutions to computing such views are often domain-specific, expensive, and incomplete. We recast the problem as incremental recursive ...


Landslide Occurances At Maierato, Italy. An Engineering Geological View, Jaithish John 2010 University of Pennsylvania

Landslide Occurances At Maierato, Italy. An Engineering Geological View, Jaithish John

Master of Science in Applied Geosciences Project Designs

This paper focuses on the 15th February, 2010 Maierato landslide in the Calabria region of Italy. The slide is believed to have been induced by heavy rainfall and happened just west of the town. The Italian basin of the Mediterranean and the peninsula are often affected by patterns of intense precipitation. About 2300 people have been evacuated just before the slide happened. No deaths or injuries have been reported. The authorities have predicted that a landslide could be happening as they have indicated the signs on the road (Figure A1) The town of Maierato was affected by slope instability not ...


Term-End Exam Scheduling At United States Military Academy/West Point, Siqun Wang, Michael Bussieck, Monique Guignard, Alexander Meeraus 2010 University of Pennsylvania

Term-End Exam Scheduling At United States Military Academy/West Point, Siqun Wang, Michael Bussieck, Monique Guignard, Alexander Meeraus

Operations, Information and Decisions Papers

Scheduling term-end exams (TEE) at the United States Military Academy in West Point is unlike any other exam timetabling problem we know of. Exam timetabling normally produces a conflict-free timetable covering a reasonably long exam period, where every exam is scheduled exactly once for all the students enrolled in the corresponding class. The situation is quite different at West Point. There are hundreds of exams to schedule over such a short time period that there is simply no feasible solution. The challenge is then to allow something that is not even considered elsewhere, that is, creating multiple sessions of some ...


Thermal History Of The Ecstall Pluton From 40Ar/39Ar Geochronology And Thermal Modeling, Sarah J. Brownlee, Paul R. Renne 2010 University of California - Berkeley

Thermal History Of The Ecstall Pluton From 40Ar/39Ar Geochronology And Thermal Modeling, Sarah J. Brownlee, Paul R. Renne

Geology Faculty Research Publications

New 40Ar/39Ar thermochronology results and thermal modeling support the hypothesis of Hollister et al. (2004), that reheating of the mid-Cretaceous Ecstall pluton by intrusion of the Coast Mountains Batholith (CMB) was responsible for spatially variable remagnetization of the Ecstall pluton. 40Ar/39Ar ages from hornblende and biotite from 12 locations along the Skeena River across the northern part of the Ecstall pluton decrease with proximity to the Quottoon plutonic complex, the nearest member of the CMB to the Ecstall pluton. The oldest 40Ar/39Ar ages are found farthest from the Quottoon plutonic complex ...


Sfa Weather Station-August 2010, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University 2010 Stephen F. Austin State University

Sfa Weather Station-August 2010, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University

Weather Station Data

No abstract provided.


Secondary Enrichment Of Copper At The Madison Gold Skarn Deposit, Silver Star District, Montana, Christopher H. Gammons, Jill Sotendahl, Dan Everett 2010 Montana Tech

Secondary Enrichment Of Copper At The Madison Gold Skarn Deposit, Silver Star District, Montana, Christopher H. Gammons, Jill Sotendahl, Dan Everett

Geological Engineering

Secondary Enrichment of Copper at the Madison Gold Skarn Deposit, Silver Star District, Montana. This paper focuses on the chemical reactions responsible for secondary enrichment of copper...we argue that most of the secondary Cu enrichment occurred during a late hydrothermal event that replaced the high temperature skarn mineral assemblage with hematitic jasperoid. Evidence favoring this "hypogene" Cu enrichment hypothesis is presented.


The Mechanical Stress–Strain Properties Of Single Electrospun Collagen Type I Nanofibers, Christine C. Helms, Corentin Coulais, Martin Guthold 2010 University of Richmond

The Mechanical Stress–Strain Properties Of Single Electrospun Collagen Type I Nanofibers, Christine C. Helms, Corentin Coulais, Martin Guthold

Physics Faculty Publications

Knowledge of the mechanical properties of electrospun fibers is important for their successful application in tissue engineering, material composites, filtration and drug delivery. In particular, electrospun collagen has great potential for biomedical applications due to its biocompatibility and promotion of cell growth and adhesion. Using a combined atomic force microscopy (AFM)/optical microscopy technique, the single fiber mechanical properties of dry, electrospun collagen type I were determined. The fibers were electrospun from a 80 mg ml−1 collagen solution in 1,1,1,3,3,3-hexafluro-2-propanol and collected on a striated surface suitable for lateral force manipulation by AFM. The ...


Internal Transitions In Nuclei And Applications To Astrophysics And Cosmochemistry, Joseph Johnson 2010 Clemson University

Internal Transitions In Nuclei And Applications To Astrophysics And Cosmochemistry, Joseph Johnson

All Dissertations

In this dissertation I analyze internal transitions in nuclei and their potential effects on s-process branching and on accelerated β-decay in cosmochemical samples. To accomplish my analysis, I have constructed a number of computational tools, which I have publicly released or make available through this thesis. I apply my analysis to the question of s-process branching at 186Re and study the implications for the osmium isotopes in mainstream presolar SiC grains. My essential conclusion is that the problem of the large neutron flux inferred from the SiC osmium isotopic abundances cannot be solved by branching through an out-of-equilibrium isomer of ...


Imaging Of Vibrating Objects Using Speckle Subtraction, Thomas R. Moore, Ashley E. Cannaday, Sarah A. Zietlow 2010 Department of Physics, Rollins College

Imaging Of Vibrating Objects Using Speckle Subtraction, Thomas R. Moore, Ashley E. Cannaday, Sarah A. Zietlow

Student-Faculty Collaborative Research Publications

A simple method for imaging vibrational motion is proposed. The process consists of capturing two speckled images of a region illuminated by coherent radiation. One of the images is captured before the onset of motion and the other during motion. If the mean speckle intensity is below the threshold for detection or above the saturation intensity of the detector, subtracting the two images produces a high contrast image of the moving region. A theory is shown to agree well with experimental data.


How Lightning Tortuosity Affects The Electromagnetic Fields By Augmenting Their Effective Distance, S L. Meredith, S K. Earles, I N. Kostanic, Niescja E. Turner, C E. Otero 2010 Trinity University

How Lightning Tortuosity Affects The Electromagnetic Fields By Augmenting Their Effective Distance, S L. Meredith, S K. Earles, I N. Kostanic, Niescja E. Turner, C E. Otero

Physics and Astronomy Faculty Research

A novel approach for developing the electromagnetic fields from a lightning return stroke which follows a tortuous path will be presented. The proposed model is unique in that it recognizes that the symmetrical tortuosity of lightning directly impacts the observable distance r, which in turn, alters the resulting electromagnetic fields. In the literature, lightning return stroke models typically employ the assumption that the cloud-to-ground path is straight. Although this assumption yields fairly consistent results across an array of varying approaches, it does not account for lightning's natural physical appearance. Furthermore, straight-line models only account for the cloud-to-ground discharges and ...


Informationstechnologischer Transfer Und Integration Der Cews-Produkte Zu Einem Homogenen Web-Angebot, Timo Wandhoefer, Vivien Petras, York Sure 2010 GESIS - Leibniz Institute for the Social Sciences

Informationstechnologischer Transfer Und Integration Der Cews-Produkte Zu Einem Homogenen Web-Angebot, Timo Wandhoefer, Vivien Petras, York Sure

Timo Wandhoefer

Als Zielsetzung dieses Projektes sind die Informationsangebote des CEWS auf die bei der GESIS betriebenen Plattformen zu übertragen und durch die Anwendung von informationswissenschaftlichen Verfahren besser untereinander und mit den übrigen Produkten der GESIS zu vernetzen. Hierzu ist eine Neugestaltung der einzelnen Informationsangebote nach softwareergonomischen Kriterien vorge-sehen, die auf der Analyse des jeweiligen Angebots sowie den Anforderungen der Nutzerinnen und Nutzer basiert. Diese Ergebnisse sind in Zusammenarbeit des CEWS und der Abteilung Informatio-nelle Prozesse in den Sozialwissenschaften (IPS) der GESIS entstanden.


Wind Power And Human Health: Flicker, Noise, And Air Quality, Erik Nordman 2010 Grand Valley State University

Wind Power And Human Health: Flicker, Noise, And Air Quality, Erik Nordman

Technical Reports

The second of a series of wind energy issue briefs synthesizes the state of the science around wind energy siting issues like flicker and noise, and analyzes how West Michigan communities are addressing these challenges. The issue brief also assesses how wind energy could improve air quality and human health outcomes in West Michigan and the region.


52nd Rocky Mountain Conference On Analytical Chemistry, 2010 University of Denver

52nd Rocky Mountain Conference On Analytical Chemistry

Rocky Mountain Conference on Magnetic Resonance

Final program, abstracts, and information about the 52nd annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-endorsed by the Colorado Section of the American Chemical Society and the Society for Applied Spectroscopy. Held in Snowmass, Colorado, August 1-5, 2010.


Fish Production In Streams With And Without Natural Broan Trout Populations, Scott Weisinger 2010 University of Pennsylvania

Fish Production In Streams With And Without Natural Broan Trout Populations, Scott Weisinger

Master of Environmental Studies Capstone Projects

Brown trout (Salmo trutta) have been introduced into the waterways throughout the United States, including Pennsylvania, since the 1800’s. They may have limited interactions with native fish species in regions where they do not reproduce successfully, but where they do concerns have arisen regarding the impact they have on native species. Are brown trout having a negative effect on the native fish? If so, could they be outcompeting the natives to the point of localized extirpation? This project compared fish communities, densities, biomass and production in two similar stretches of stream in the White Clay Creek, one known to ...


Assessing The Effectiveness Of Studio Physics At Georgia State University, Brianna M. Upton 2010 Georgia State University

Assessing The Effectiveness Of Studio Physics At Georgia State University, Brianna M. Upton

Physics and Astronomy Theses

Previous studies have shown that many students have misconceptions about basic concepts in physics which persist after instruction. It has been concluded that one of the challenges lies in the teaching methodology. To address this, Georgia State University (GSU) has begun teaching studio algebra-based physics. Although many institutions have implemented studio physics, most have done so in calculus-based sequences. Additionally, the unique environment of GSU’s population as a diverse, urban research institution is considered. The effectiveness of the studio approach for this demographic in an algebra-based introductory physics course was assessed. This five-semester pilot study presents demographic survey results ...


Choosing Management Information Systems As A Major: Understanding The Smifactors For Mis, Thomas W. Ferratt, Stephen R. Hall, Jayesh Prasad, Donald E. Wynn 2010 University of Dayton

Choosing Management Information Systems As A Major: Understanding The Smifactors For Mis, Thomas W. Ferratt, Stephen R. Hall, Jayesh Prasad, Donald E. Wynn

MIS/OM/DS Faculty Publications

Given declining management information systems (MIS) enrollments at our university, we seek to understand our students‘ selection of a major. Prior studies have found that students choose a major based on a number of factors, with subject matter interest consistently being most important. We contribute to the literature by developing a deeper understanding of what is meant by subject matter interest, which we refer to as smiFactors, for MIS as a major and career. Based on a qualitative analysis of open-ended survey questions completed by undergraduate business students, we confirm a number of smiFactors for MIS gleaned from recent studies ...


Consideration Of Dispersion And Group Velocity Dispersion In The Determination Of Velocities Of Electromagnetic Propagation, Monish Ranjan Chatterjee, Partha P. Banerjee 2010 University of Dayton

Consideration Of Dispersion And Group Velocity Dispersion In The Determination Of Velocities Of Electromagnetic Propagation, Monish Ranjan Chatterjee, Partha P. Banerjee

Electrical and Computer Engineering Faculty Publications

Electromagnetic (EM) propagation velocities play an important role in the determination of power and energy flow in materials and interfaces. It is well known that group and phase velocities need to be in opposition in order to achieve negative refractive index.

Recently, we have shown that considerable differences may exist in phase, group and signal/energy velocities for normal and anomalous dispersion, especially near dielectric resonances. This paper examines the phase and group velocities in the presence of normal and anomalous dispersion, and group velocity dispersion (GVD), which requires introduction of the second order coefficient in the permittivity and permeability ...


Slip Distribution Of The 1952 Kamchatka Great Earthquake Based On Near-Field Tsunami Deposits And Historical Records, Breanyn MacInnes, Robert Weiss, Joanne Bourgeois, Tatiana K. Pinegina 2010 University of Washington - Seattle Campus

Slip Distribution Of The 1952 Kamchatka Great Earthquake Based On Near-Field Tsunami Deposits And Historical Records, Breanyn Macinnes, Robert Weiss, Joanne Bourgeois, Tatiana K. Pinegina

All Faculty Scholarship for the College of the Sciences

We explore the magnitude and slip distribution of the 1952 Kamchatka earthquake (MW 8.8–9.0) using constraints from the 1952 Kamchatka tsunami. Our new field data provide more comprehensive coverage of the near-field tsunami than had been available to date. We examine the effects of internal slip distribution within complex earthquake ruptures on near-field tsunami runup and evaluate some of the limitations of this approach. Our approach compares tsunami-deposit distribution with simulated runup from tsunamis generated by different configurations of seafloor deformation from hypothetical earthquakes resembling that of the 1952 Kamchatka earthquake. We identify areas of high ...


Swift Monitoring Of Cygnus X-2: Investigating The Near-Ultraviolet-X-Ray Connection, E. S. Rykoff, E. M. Cackett, J. M. Miller 2010 University of California at Santa Barbara

Swift Monitoring Of Cygnus X-2: Investigating The Near-Ultraviolet-X-Ray Connection, E. S. Rykoff, E. M. Cackett, J. M. Miller

Physics and Astronomy Faculty Research Publications

The neutron star X-ray binary (NSXRB) Cyg X-2 was observed by the Swift satellite 51 times over a 4 month period in 2008 with the X-ray Telescope (XRT), UV/optical telescope, and Burst Alert Telescope (BAT) instruments. During this campaign, we observed Cyg X-2 in all three branches of the Z track (horizontal, normal, and flaring branches). We find that the NUV emission is uncorrelated with the soft X-ray flux detected with the XRT and is anticorrelated with the BAT X-ray flux and the hard X-ray color. The observed anticorrelation is inconsistent with simple models of reprocessing as the source ...


Digital Commons powered by bepress