Physical Sciences and Mathematics Commons^™

Stellar Pollution And [Fe/H] In The Hyades, Aaron Dotter, Brian Chaboyer

Dartmouth Scholarship

The Hyades open cluster presents a unique laboratory for planet formation and stellar pollution studies because all of the stars have essentially the same age and were born from the same cloud of gas. Furthermore, with an age of ~650 Myr, most of the intermediate- and low-mass stars are on the main sequence. Given these assumptions, the accretion of metal-rich material onto the surface of a star during and shortly after the formation of planetary systems should be evident via the enhanced metallicity of the star. Building on previous work, stellar evolution models that include the effects of stellar pollution …

Integrated Hydrologic And Hydrochemical Observations Of Hidden Creek Lake Jökulhlaups, Kennicott Glacier, Alaska, Suzanne P. Anderson, Joseph S. Walder, Robert S. Anderson, Erin R. Kraal, Michelle Cunico, Andrew G. Fountain, Dennis C. Trabant

Geology Faculty Publications and Presentations

Hidden Creek Lake (HCL), an ice-marginal lake impounded by Kennicott Glacier, Wrangell Mountains, Alaska, fills annually to ~20 to 30 x ~10⁶ m³ and then drains subglacially within 2 to 3 days. During the 1999 and 2000 jökulhlaups, we carried out a series of planned observations around the lake and in the Kennicott River, which drains the glacier. Approximately 20% of the lake volume was contained within a subglacial water ‘‘wedge’’ beneath the ice dam. The entire volume of the lake drains through the wedge; hydraulic head loss through this constriction may be responsible for the fairly symmetrical shape of …

Final Report On Task 12: Southern Great Basin Seismic Network Operations, James N. Brune, David Von Seggern, Ken Smith, Glenn Biasi

Publications (YM)

The Nevada Seismological Laboratory began seismic monitoring operations under the DOE-UCCSN Cooperative Agreement on 11/01/1999. This final report summarizes our activities and studies made in the four years up to 09/30/2003. Previously, NSL operated under the M&O for the Yucca Mountain Project from October 1995 through September 1999 and under the U. S. Geological Survey from October 1992 through September 1995. For purposes of this report, earthquakes occurring in the years FY1998 and FY1999 were analyzed in the first two years of the NSL’s involvement with the Cooperative Agreement, and they will be treated here, along with the data in …

A Nested Unsupervised Approach To Identifying Novel Molecular Subtypes, Elizabeth Garrett, Giovanni Parmigiani

Johns Hopkins University, Dept. of Biostatistics Working Papers

In classification problems arising in genomics research it is common to study populations for which a broad class assignment is known (say, normal versus diseased) and one seeks to find undiscovered subclasses within one or both of the known classes. Formally, this problem can be thought of as an unsupervised analysis nested within a supervised one. Here we take the view that the nested unsupervised analysis can successfully utilize information from the entire data set for constructing and/or selecting useful predictors. Specifically, we propose a mixture model approach to the nested unsupervised problem, where the supervised information is used to …

Ξ‾ And Ω Distributions In Hadron–Nucleus Interactions, R. Vogt, Thomas D. Gutierrez

Physics

Strange baryons have long been known to exhibit a leading particle effect. A recent comparison of Ξ‾ production in π‾, n, and Σ‾ interactions with nuclei show this effect clearly. These data are supplemented by earlier measurements of Ξ‾ and Ω production by a Ξ‾ beam. We calculate the Ξ‾ and Ω x_F distributions and nuclear dependence in hA interactions using the intrinsic model.

Measurement Of Anti-Cancer Agent Methoxyamine In Plasma By Tandem Mass Spectrometry With On-Line Sample Extraction, Shuming Yang, Lili Liu, Stanton L. Gerson, Yan Xu

Chemistry Faculty Publications

In this work, we present the development and validation of a tandem mass spectrometry method for the quantitative determination of methoxyamine (CH3ONH2), a potential new chemotherapeutic agent, in human and mouse plasma. Methoxyamine together with the internal standard (I.S.) methoxyl-D3-amine was directly derivatized in plasma sample with a novel chemical agent 4-(N,N-diethylamino)benzaldehyde. The product solution was injected into an on-line Oasis® HLB extraction column ( mm) for analyte extraction. After the elution of extractives, the derivatized analytes were monitored by the positive-electrospray-ionization mass spectrometry (ESI-MS-MS). The structures of derivatized analytes were elucidated by fragmentation. Quantitation of plasma methoxyamine was carried …

Tight Coupling Between Soil Moisture And The Surface Radiation Budget In Semiarid Environments: Implications For Landatmosphere Interactions, Eric E. Small, Shirley A. Kurc

Environmental Science and Geology Faculty Research Publications

Observations are used to examine how soil moisture influences the surface radiation budget, ground heat flux, and available energy in semiarid environments. Defining this relationship is critical to understand interactions between the land surface and the atmosphere, in particular assessing if a feedback exists between soil moisture and rainfall anomalies. We use two summers of data collected from semiarid grassland and shrubland ecosystems in central New Mexico. The response of surface radiation budget components and other variables to soil moisture variations are quantified via linear regression. Then, the variations are scaled over the observed range of soil moisture (15% volumetric …

Resistive Transitions In Quench-Condensed Bi Films Near A Normal-Metal Ground Plane, Richard P. Barber Jr., Ben Kain

Physics

We report observations of the zero-field resistive transitions of superconducting quench-condensed Bi0.97Tl0.03 films both near electrically isolated normal-metal ground planes and on clean fire-polished glass. Transition temperatures, obtained by fitting the data with the two-dimensional Aslamazov-Larkin theory of fluctuation conductance, were found to be significantly enhanced for films deposited over ground planes versus those deposited onto insulating substrates. Conductivity enhancement due to superconducting fluctuations was found to be much less than expected for the thinnest samples. This suppression was coincident with broadened superconductor transitions that are consistent with nonuniform sample thickness. Sufficiently thick films showed reasonable agreement with both the …

Data Mining And Mining Disasters: Terrorism Information Awareness, Ibpp Editor

International Bulletin of Political Psychology

This article identifies problems with data mining approaches to antiterrorism and counterterrorism.

The Psychology Of Intelligent Video Analysis, Ibpp Editor

International Bulletin of Political Psychology

This article examines issues surrounding software-enhanced video analysis in an intelligence context.

Task 10: Support To The Regional Model, Irene Farnham

Publications (YM)

The Harry Reid Center for Environmental Studies (HRC) at the University of Nevada, Las Vegas (UNLV) has analyzed approximately 200 groundwater samples for over 60 trace elements and major solutes over the past ten years. These samples represent groundwaters from the Nevada Test Site, Amargosa Valley, the Spring Mountains, Death Valley, Ash Meadows, Pahranagat Valley, and Oasis Valley. The preparation of a data base containing all of these data is near completion and will be submitted to DOE upon its completion. Data verification is in progress. In addition, many multivariate analyses were performed to characterize the trace element compositions in …

Generalized Residual Multiple Model Adaptive Estimation Of Parameters And States, Charles D. Ormsby

Theses and Dissertations

This dissertation develops a modification to the standard Multiple Model Adaptive Estimator (MMAE) which allows the use of a new "generalized residual" in the hypothesis conditional probability calculation. The generalized residual is a linear combination of traditional Kalman filter residuals and "post-fit" Kalman filter residuals which are calculated after measurement incorporation. This modified MMAE is termed a Generalized Residual Multiple Model Adaptive Estimator (GRMMAE). The dissertation provides a derivation of the hypothesis conditional probability formula which the GRMMAE uses to calculate probabilities that each elemental filter in the GRMMAE contains the correct parameter value. Through appropriate choice of a single …

A Population Pharmacokinetic Model With Time-Dependent Covariates Measured With Errors, Lang Lil, Xihong Lin, Mort B. Brown, Suneel Gupta, Kyung-Hoon Lee

The University of Michigan Department of Biostatistics Working Paper Series

We propose a population pharmacokinetic (PK) model with time-dependent covariates measured with errors. This model is used to model S-oxybutynin's kinetics following an oral administration of Ditropan, and allows the distribution rate to depend on time-dependent covariates blood pressure and heart rate, which are measured with errors. We propose two two-step estimation methods: the second order two-step method with numerical solutions of differential equations (2orderND), and the second order two-step method with closed form approximate solutions of differential equations (2orderAD). The proposed methods are computationally easy and require fitting a linear mixed model at the first step and a nonlinear …

Chemical Analyses For Alcove 8 Niche 3 Tracer Studies, Irene Farnham, Klaus J. Stetzenbach, Amy J. Smiecinski

Publications (YM)

This report details the activities performed under Task 35 of the University and Community College System of Nevada (UCCSN) Cooperative Agreement with the US Department of Energy (DOE). Task 35, titled "Chemical Analyses for Alcove 8 / Niche 3 Tracer Studies", provided for the development of analytical procedures and the analysis of samples from the first phase of tracer testing at Alcove 8 / Niche 3 in the Exploratory Studies Facility (ESF). Two conservative tracers (bromide and pentafluorobenzoic acid) and three FD&C dye tracers (FD&C Blue #1, FD&C Yellow #5, and FD&C Red #40) were analyzed in the seepage samples …

Nonpolar Second-Order Nonlinear And Electrooptic Materials: Axially Ordered Chiral Polymers And Liquid Crystals, Kenneth D. Singer, Rolfe G. Petschek, Victor Ostroverkhov

Faculty Scholarship

This article reviews our work on the development and optimization of chiral, nonpolar media with large second-order nonlinear optical responses. We show how molecular engineering, theory, and measurements can be used to optimize this promising class of nonlinear optical materials. We describe how supramolecular alignment into easily processable materials takes advantage of the relevant molecular hyperpolarizabilities. A wide variety of techniques can be used to fabricate bulk materials belonging to the chiral nonpolar symmetry groups, D∞ and D2. The microscopic chromophore alignment schemes that optimize the nonlinear optical response in such materials are deduced from general symmetry considerations for both …

Ustranscom: Corporate Information-Centric Environment, Collaborative Agent Design Research Center

Collaborative Agent Design (CAD) Research Center

As a result of foresight and planning that has established a logical data model (i.e., the Master Model), a set of standard reference tables and 17 migration software systems as the foundation of a disciplined Corporate Data Environment (CDE), USTRANSCOM now finds itself in the enviable position of being able to implement DoD’s vision of a Global Information Grid (GIG) with speed and confidence. The urgency with which DoD views the need to shift the burden of tedious data filtering and interpretation tasks from human operators to automated machine-based processes, is reflected in the CDE and provides the opportunity for …

The Equation, Fall 2003, College Of Science And Mathematics, Wright State University

College of Science and Mathematics Newsletters

This 6 page newsletter discusses various happenings within the College of Science and Mathematics. It begins with a letter from the dean, and continues on with news, events, alumni news, and other community news.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 20, Number 2, October 2003, 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.

Runoff And Sediment Losses From Annual And Unusual Storm Events From The Alto Experimental Watersheds, Texas: 23 Years After Silvicultural Treatments, Matthew W. Mcbroom, R Scott Beasley, Mingteh Chang, Brian Gowin, George G. Ice

Faculty Publications

Evaluating the potential impacts of intensive silvicultural practices on water quality is critical for establishing the long-term sustainability of contemporary forest management practices. From 1979 to 1985, a study involving nine small (~2.5 ha) forested watersheds was conducted near Alto, Texas in the upper western Gulf-Coastal Plain to evaluate the impacts then-current silvicultural practices on water quality. In the years following the study, silvicultural Best Management Practices (BMPs) including Streamside Management Zones (SMZs) and other erosion control practices evolved and questions arose about the applicability of earlier results to current practices. In 1999, these same watersheds were reinstrumented to evaluate …

Plasma Density Gratings Induced By Intersecting Laser Pulses In Underdense Plasmas, Z.-M. Sheng, Jiandi Zhang, Donald Umstadter

Donald Umstadter Publications

Electron and ion density gratings induced by two intersecting ultrashort laser pulses at intensities of 10¹⁶ W/cm² or lower are investigated. The ponderomotive force generated by the inhomogeneous intensity distribution in the intersecting region of the interfering pulses produces deep electron and ion density modulations at a wavelength less than a laser wavelength in vacuum. Dependence of the density modulation on the plasma densities, temperatures, and the ion mass, as well as the laser pulse parameters are studied analytically and by particle-in-cell simulations. It is found that the density peaks of such gratings can be a few times …

Chemistry & Biochemistry Newsletter, Department Of Chemistry & Biochemistry, South Dakota State University

Chemistry & Biochemistry Newsletter: 2002-2015

Inside:

Page 2 New Graduate Students in Chemistry/Biochemistry

Page 3 and 4 New Faculty

Page 5 Alumni News; Faculty and Staff News; Foundation Donors

Page 6 Recent Faculty Publications

Geogram 2003, David J. Keeling Editor, Wku Department Of Geography And Geology

Earth, Environmental, and Atmospheric Sciences Publications

No abstract provided.

Utilising Riometry To Observe Gravity Waves In The Sunlit Mesosphere, M. J. Jarvis, R. E. Hibbins, Michael J. Taylor, T. J. Rosenberg

All Physics Faculty Publications

The novel use of imaging riometers to observe mesospheric gravity waves is described. Imaging riometers respond to changes in the absorption of cosmic radio noise in the ionospheric D-region which enables them to detect the compression and rarefaction of the atmosphere at 90 km altitude generated by the passage of gravity waves. A considerable advantage of this method is that, unlike conventional techniques which rely on imaging faint optical emissions from the airglow layer at 87 km altitude, riometers remain operative under daylit, moonlit or cloudy conditions. This is particularly important for research into gravity wave forcing of mesospheric temperature …

Where's (The) Computer Science In Service-Learning?, Pete Sanderson

Mathematics Faculty Scholarship

Service-learning is a form of experiential learning that integrates classroom concepts with related community service. Computer science faculty and students stand to reap great benefit from the integration of service-learning practice and philosophy into curricula. Many faculty are already doing so, yet computer science is not very visible in the service-learning community. Similarly, service-learning is not very visible in the computer science education community. It is imperative for those computer science faculty involved in service-learning to develop, apply and disseminate effective frameworks for integrating service learning into undergraduate computer science curricula so that its benefits may be more fully realized.

Recent Paleoseismic Investigations In Northern And Western Thailand, Clark H. Fenton, Punya Charusiri, Spencer H. Wood

Geosciences Faculty Publications and Presentations

Recent paleoseismic investigations have identified a number of active faults in Northern and Western Thailand. Northern Thailand is an intraplate basin and range province, comprised of north-south-trending Cenozoic intermontane grabens and half grabens, bounded by north- to northwest-striking normal to normal-oblique faults and northeast-striking left-lateral strike-slip faults. The basin-bounding normal faults are marked by steep, linear range fronts with triangular facets and wineglass canyons and have slip rates of 0.1 to 0.8 mm/yr. Based on limited data, the average vertical displacement-per-event is about 1.0 to 1.5 m. These faults are characterized by recurrence intervals of thousands to tens of thousands …

Split Knowledge Level Modeling, Michael A. Zang, Jens G. Pohl

Collaborative Agent Design (CAD) Research Center

Traditional approaches to building intelligent information systems employ an object model to define a representational structure for the information of interest within the target domain of the system. At runtime, the model provides a constrained template for the creation of the individual object instances and relationships that together define the state of the system at a given point in time. The ontology also provides a vocabulary for expressing domain knowledge typically in the form of rules (declarative knowledge) or methods (procedural knowledge). Agents operating within the system utilize the encoded knowledge to progress the state of the system towards the …

Ua66/1/5 Applied Research & Technology Program Newsletter, Issue 2, Wku Applied Research & Technology Program

WKU Administration Documents

Newsletter created by and about the Applied Research & Technology Program.

Student Fact Book, Fall 2003, Twenty-Seventh Annual Edition, Wright State University, Office Of Student Information Systems, Wright State University

Wright State University Student Fact Books

The student fact book has general demographic information on all students enrolled at Wright State University for Fall Quarter, 2003.

Stability In The Proportion Of Harbor Seals Hauled Out Under Locally Ideal Conditions, Michael Simpkins, David Withrow, Jack Cesarone, Peter Boveng

United States Department of Commerce: Staff Publications

We monitored the haul-out behavior of 68 radio-tagged harbor seals (Phoca vitulina) during the molt season at two Alaskan haul-out sites (Grand Island, August-September 1994; Nanvak Bay, August-September 2000). For each site, we created a statistical model of the proportion of seals hauled out as a function of date, time of day, tide, and weather covariates. Using these models, we identified the conditions that would result in the greatest proportion of seals hauled out. Although those “ideal conditions” differed between sites, the proportion of seals predicted to be hauled out under those conditions was very similar (81.3% for …

Implications Of Test-Driven Development: A Test Study, Reid Kaufmann, David S. Janzen

Computer Science and Software Engineering

A Spring 2003 experiment examines the claims that test-driven development or test-first programming improves software quality and programmer confidence. The results indicate support for these claims and inform larger future experiments.