Physical Sciences and Mathematics Commons^™

Short-Term Impacts Of Military Overflights On Caribou During Calving Season, James P. Lawler, Audrey J. Magoun, C. Tom Seaton, Craig L. Gardner, Rodney D. Boertje, Jay M. Ver Hoef, Patricia A. Del Vecchio

United States National Park Service: Publications

The Fortymile Caribou Herd (FCH) is the most prominent caribou herd in interior Alaska. A large portion of the FCH calving and summer range lies beneath heavily used Military Operations Areas (MOA) that are important for flight training. We observed the behavior of Grant’s cow caribou (Rangifer tarandus granti) and their calves before, during, and immediately following low-level military jet overflights. We also monitored movements of radiocollared cow caribou and survival of their calves. We conducted fieldwork from mid May through early June 2002. We concluded that military jet overflights did not cause deaths of caribou calves in …

Against Realist Instruction: Superficial Success Masking Catastrophic Failure And An Alternative, Dewey I. Dykstra

Physics Faculty Publications and Presentations

Purpose: Often radical constructivists are confronted with arguments why radical constructivism is wrong. The present work presents a radical constructivist alternative to such arguments: a comparison of the results of two instructional practices, the standard, realistbased instruction and a radical constructivist-based instruction, both in physics courses. Design: Evidence from many studies of student conceptions in standard instruction (Duit 2004) is taken into account. In addition, diagnostic data, pre and post instruction, were collected from over 1,000 students in multiple institutions across the U. S. over a period of about 15 years via an established diagnostic of conceptual understanding of motion …

Nonlinear Optics And An Experimental Test Of Bell’S Inequality, Michael Herbst

Honors Papers

The purpose of this investigation is to assemble an apparatus capable of testing Bell’s inequality for a local hidden variable. The historical context and theoretical developments that led to this area of inquiry are presented. Expected experimental results stemming from two distinct physical theories are introduced. Procedures are given that outline the assembly of a device capable of testing these theories. Analysis confirming the successful completion of a majority of the steps is presented, and the final necessary steps are detailed. Finally, a laboratory prompt for this experiment’s use in Oberlin College’s advanced laboratory class is given.

Simulation Of Electronic And Geometric Degrees Of Freedom Using A Kink-Based Path Integral Formulation: Application To Molecular Systems, Randall W. Hall

Collected Faculty and Staff Scholarship

A kink-based path integral method, previously applied to atomic systems, is modified and used to study molecular systems. The method allows the simultaneous evolution of atomic and electronic degrees of freedom. Results for CH₄, NH₃, and H₂O demonstrate this method to be accurate for both geometries and energies. Comparison with DFT and MP2 level calculations show the path integral approach to produce energies in close agreement with MP2 energies and geometries in close agreement with both DFT and MP2 results.

Contents

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Specialists Definition

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Specialists Task Force Report, Virginia Mathematics And Science Coalition Task Force

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Specialists In Alexandria City Public Schools, S. Birnie

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Specialists In Elementary Schools: "The Arlington Story", P. Robertson

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Specialists In Norfolk Public Schools, D. Walston

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Leadership Progress In Stafford County Schools, V. Inge

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Hopewell, Virginia: How Do You "Hook" Elementary Teachers Into Enjoying And Seeing The Beauty Of Mathematics?, Y. Smith-Jones

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Professional Development That Focuses On Student Achievement: A Parallel Case Example, N. R. Iverson

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Teacher-In-Residence Program At California State University, Chico, W. Fisher

Journal of Mathematics and Science: Collaborative Explorations

California State University, Chico has incorporated a Teacher-in-Residence program within the Department of Mathematics and Statistics. The purpose of this program is to have an elementary school teacher take a leave of absence from his or her classroom in order to work half—time in the Department of Mathematics at the University and half-time for the Chico Unified School District as a Mathematics Resource Specialist.

Aims & Scope

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Vacancy-Mediated Hydrogen Desorption In Naalh4, C. Moysés Araújo, S. Li, R. Ahuja, Puru Jena

Physics Publications

First-principles calculations based on density functional theory are carried out to understand the mechanisms responsible for hydrogen desorption from Ti-doped sodium-alanate (NaAlH4). While the energy needed to remove a hydrogen atom from NaAlH4 with Ti substituted either at the Na site or at Al site is found to be significantly lower than that from the pristine NaAlH4, the presence of Na vacancies is shown to play an even larger role: It is not only an order of magnitude smaller than that from Ti-doped sodium-alanate, but the removal of hydrogen associated with a Na vacancy is exothermic with respect to formation …

Ab Initio Study Of Ferromagnetism In Ga1−Xcrxn Thin Films, Qin Wang, Q. Sun, Puru Jena, J. Z. Yu, R. Note, Y. Kawazoe

Physics Publications

Electronic structure and magnetic properties of Ga1-xCrxN thin films are studied using the gradient corrected density functional method and a supercell slab model. Calculations are carried out by varying the concentration of doped Cr atoms and the sites they occupy. Cr atoms are found to prefer to reside on the surface sites and cluster around N as Mn atoms do. However, unlike Mn-doped GaN, Cr-doped GaN is found to be ferromagnetic for all concentrations studied. The calculated ferromagnetism is in agreement with recent experimental observations.

First-Principles Study Of Ferromagnetic Coupling In Zn1-Xcrxte Thin Film, Q. Wang, Q. Sun, P. Jena, Y. Kawazoe

Physics Publications

Using gradient-corrected density functional theory and supercell technique, we have calculated total energies, electronic structure, and magnetic properties of Cr-doped ZnTe in both bulk and thin-film configurations. Calculations with full geometry optimization for a Zn1−xCrxTesupercell were carried out for different Cr concentrations (x=0.095, 0.143, and 0.19) and by varying the sites Cr atoms occupy. We show that the ferromagnetic phase of Zn1−xCrxTe in both bulk and thin film is energetically the most preferable state irrespective of the concentration and∕or site occupation of the Cr atom. The strong hybridization between Cr3d and Te5p states is found to be responsible for the …

Evolution Of The Electronic Structure Of Be Clusters, V. Cerowski, B. K. Rao, S. K. Khanna, P. Jena, Soh Ishii, Kaoru Ohno, Yoshiyuki Kawazoe

Physics Publications

Using a modified symbiotic genetic algorithm approach and many-body interatomic potential derived from first principles, we have calculated equilibrium geometries and binding energies of the ground-state and low-lying isomers of Be clusters containing up to 41 atoms. Molecular-dynamics study was also carried out to study the frequency of occurrence of the various geometrical isomers as these clusters are annealed during the simulation process. For a selected group of these clusters, higher-energy isomers were more often found than their ground-statestructures due to large catchment areas. The accuracy of the above ground-stategeometries and their corresponding binding energies were verified by carrying out …

Effects Of Hydrogen On The Morphology And Electrical Properties Of Gan Grown By Plasma-Assisted Molecular-Beam Epitaxy, Y. Dong, R. M. Feenstra, D. W. Greve, J. C. Moore, M. D. Sievert, A. A. Baski

Physics Publications

We study the effect of introducing hydrogen gas through the rf-plasma source during plasma-assisted molecular-beam epitaxy of GaN(0001). The well-known smooth-to-rough transition that occurs for this surface as a function of decreasing Ga flux in the absence of H is found to persist even with H present, although the critical Ga flux for this transition increases. Under Ga-rich conditions, the presence of hydrogen is found to induce step bunching (facetting) on the surface. Conductive atomic force microscopy reveals that leakage current through dislocation cores is significantly reduced when hydrogen is present during the growth.

Vlba Polarization Observations Of Markarian 421 After A Gamma-Ray High State, B. Glenn Piner, Philip G. Edwards

Physics

We present four high dynamic range, dual-circular polarization, Very Long Baseline Array (VLBA) observations at 22 GHz of Mrk 421, taken throughout the year following the source's unprecedented gamma-ray high state in early 2001. Previous VLBI observations of this source had shown only subluminal apparent motions in the parsec-scale jet and no apparent connection between jet components and gamma-ray flares, so we examined whether the larger gamma-ray flares of 2001 had produced a component that could be followed on the parsec-scale VLBA images. These four new VLBA observations are combined with data from our earlier 1999 paper and archival VLBA …

Quantitative And Qualitative Assessment Of Groundwater Resources In Al-Khatim Area, Uae, Ahmed Khaled Othman

Accounting Dissertations

The UAE has achieved remarkable progress in transformation from separated small emirates to a modem union country with a high standard of living. The country is however, considered an extreme arid region. In spite of these harsh conditions, The UAE government has encouraged plantation in towns, villages and country side. This has led to sharp increase in the agricultural sector particularly during the last three decades. As the irrigated land kept increasing, there was a deep concern about the water demand and the impact of agriculture activities on groundwater systems. Al-Khatim area is considered one of the most

important agricultural …

A Platform-Independent Software Suite For Statistical Analysis Of High Dimensional Biology Data, David B. Allison, Jacob P. L. Brand, Jode W. Edwards, Gary L. Gadbury, Kyoungmi Kim, Tapan Mehta, Grier P. Page, Amit Patki, Vinodh Srinivasasainagendra, Prinal Trivedi, Jelai Wang, Stanislav O. Zakharkin

Mathematics and Statistics Faculty Research & Creative Works

Many efforts in microarray data analysis are focused on providing tools and methods for the qualitative analysis of microarray data. HDBStat! (High-Dimensional Biology-Statistics) is a software package designed for analysis of high dimensional biology data such as microarray data. It was initially developed for the analysis of microarray gene expression data, but it can also be used for some applications in proteomics and other aspects of genomics. HDBStat! provides statisticians and biologists a flexible and easy-to-use interface to analyze complex microarray data using a variety of methods for data preprocessing, quality control analysis and hypothesis testing.

Maximal Regular Boundary Value Problems In Banach-Valued Weighted Space, Ravi P. Agarwal, Veli B. Shakhmurov, Martin Bohner

Mathematics and Statistics Faculty Research & Creative Works

This study focuses on nonlocal boundary value problems for elliptic ordinary and partial differential-operator equations of arbitrary order, defined in Banach-valued function spaces. The region considered here has a varying bound and depends on a certain parameter. Several conditions are obtained that guarantee the maximal regularity and Fredholmness, estimates for the resolvent, and the completeness of the root elements of differential operators generated by the corresponding boundary value problems in Banach-valued weighted Lp spaces. These results are applied to nonlocal boundary value problems for regular elliptic partial differential equations and systems of anisotropic partial differential equations on cylindrical domain to …

Second Order Dynamic Inclusions, Christopher C. Tisdell, Martin Bohner

Mathematics and Statistics Faculty Research & Creative Works

The theory of dynamic inclusions on a time scale is introduced, hence accommodating the special cases of differential inclusions and difference inclusions. Fixed point theory for set-valued upper semicontinuous maps, Green's functions, and upper and lower solutions are used to establish existence results for solutions of second order dynamic inclusions.

Existence And Comparison Principles For General Quasilinear Variational-Hemivariational Inequalities, Siegfried Carl, Vy Khoi Le, Dumitru Motreanu

Mathematics and Statistics Faculty Research & Creative Works

We consider quasilinear elliptic variational-hemivariational inequalities involving convex, lower semicontinuous and locally Lipschitz functionals. We provide a generalization of the fundamental notion of sub- and supersolutions on the basis of which we then develop the sub-supersolution method for variational-hemivariational inequalities, including existence, comparison, compactness and extremality results.

Existence, Comparison, And Compactness Results For Quasilinear Variational-Hemivariational Inequalities, Vy Khoi Le, Dumitru Motreanu, Siegfried Carl

Mathematics and Statistics Faculty Research & Creative Works

We consider quasilinear elliptic variational-hemivariational inequalities involving the indicator function of some closed convex set and a locally Lipschitz functional. We provide a generalization of the fundamental notion of sub- and supersolutions, on the basis of which we then develop the sub-supersolution method for variational-hemivariational inequalities, including existence, comparison, compactness, and extremality results.

A Quasilinearization Approach For Two Point Nonlinear Boundary Value Problems On Time Scales, Elvan Akin, Ferhan Atici. Merdivenci

Mathematics and Statistics Faculty Research & Creative Works

No abstract provided.

The State Of Coral Reef Ecosystems Of Florida, Katherine Andrews (Ed.), Larry Nall (Ed.), Chris Jeffrey (Ed.), Simon Pittman (Ed.), Kenneth Banks, Carl Beaver, James A. Bohnsack, Richard E. Dodge, David S. Gilliam, Walter Jaap, Brian Keller, V. R. Leeworthy, Tom Matthews, Ramon Ruiz-Carus, Deborah Santavy, Richard E. Spieler, Jerald Ault, Gabriel Delgado, Fleur M. Ferro, Carol R. Fretwell, Bill Goodwin, Doug Harper, John Hunt, Margaret Miller, Christy Pattengil-Semmens, Bill Sharp, Steve Smith, Jennifer Wheaton, Dana Williams

Marine & Environmental Sciences Faculty Reports

No abstract provided.

Sea Turtle Conservation Program, Broward County, Fl 2005 Report, Curtis M. Burney, Stefanie Ouellette

Marine & Environmental Sciences Faculty Reports

No abstract provided.