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A Shot In The Dark Near Tragedy Follows Snollygoster Parade, Meredith Jones-Gray Jan 2003

A Shot In The Dark Near Tragedy Follows Snollygoster Parade, Meredith Jones-Gray

Faculty Publications

No abstract provided.

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Monitoring Environmental Stress In Forest Trees Using Biochemical And Physiological Markers, Rakesh Minocha, Subhash C. Minocha, Stephanie Long Jan 2003

Monitoring Environmental Stress In Forest Trees Using Biochemical And Physiological Markers, Rakesh Minocha, Subhash C. Minocha, Stephanie Long

Faculty Publications

Our objective was to determine the usefulness of polyamines, particularly putrescine, and amino acids such as arginine, as foliar indicators of abiotic stress in visually asymptomatic trees. An evaluation of apparently healthy trees is essential in developing risk assessment and stress remediation strategies for forest trees prior to the onset of obvious decline. Previous research by our group established a positive correlation between putrescine in red spruce foliage and A1:Ca ratios in the forest soil. A positive correlation was also observed between foliar putrescine and nitrogen deposition in the soil in pine, maple, and oak at Harvard Forest, MA. Preliminary …

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Identity Management, Duncan A. Buell, Ravi Sandhu Jan 2003

Identity Management, Duncan A. Buell, Ravi Sandhu

Faculty Publications

No abstract provided.

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The Zen Of The Web, Jeff Heflin, Michael N. Huhns Jan 2003

The Zen Of The Web, Jeff Heflin, Michael N. Huhns

Faculty Publications

No abstract provided.

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How Shall We Worship?, Lilianne Douhkan Jan 2003

How Shall We Worship?, Lilianne Douhkan

Faculty Publications

"What is the right form of worship? Is there only one correct form or style? Have worship forms changed over time? Who decides which form or format is appropriate? Setting aside personal opinions and preferences, we need to discover the answer from God's Word."

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High Above, Ivan Davis Jan 2003

High Above, Ivan Davis

Faculty Publications

No abstract provided.

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Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan Dec 2002

Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan

Faculty Publications

We report on AlGaN multiple-quantum-well (MQW)-based deep ultraviolet light-emitting diodes over sapphire with peak emission at 278 nm. A new buffer layer growth process was used to reduce the number of defects and hence the nonradiative recombination. The improved material quality and carrier confinement resulted in pulsed powers as high as 3 mW at 278 nm and a significantly reduced deep-level-assisted long-wavelength emission.

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Level Oriented Formal Model For Asynchronous Circuit Verification And Its Efficient Analysis Method, Eric G. Mercer, Tomoya Kitai, Chris Myers, Yusuke Oguro, Tomohiro Yoneda Dec 2002

Level Oriented Formal Model For Asynchronous Circuit Verification And Its Efficient Analysis Method, Eric G. Mercer, Tomoya Kitai, Chris Myers, Yusuke Oguro, Tomohiro Yoneda

Faculty Publications

Using a level-oriented model for verification of asynchronous circuits helps users to easily construct formal models with high readability or to naturally model datapath circuits. On the other hand, in order to use such a model on large circuits, techniques to avoid the state explosion problem must be developed. This paper first introduces a level-oriented formal model based on time Petri nets, and then proposes its partial order reduction algorithm that prunes unnecessary state generation while guaranteeing the correctness of the verification.

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Sea Surface Salinity Measurements In The Historical Database, Frederick M. Bingham, Stephan D. Howden, Chester J. Koblinsky Dec 2002

Sea Surface Salinity Measurements In The Historical Database, Frederick M. Bingham, Stephan D. Howden, Chester J. Koblinsky

Faculty Publications

We have examined historical distributions of sea surface salinity (SSS) observations in a data set consisting of a combination of the World Ocean Database 1998 (WOD98) and a thermosalinograph and bucket salinity database collected from volunteer observing ships. It is well known that SSS in much of the world's ocean is measured infrequently or not at all. We find that 27% of one-degree squares in the world ocean (open and coastal, excluding the Arctic Ocean) had no observations of SSS in the historical database, and 70% had 10 or fewer. Systematic sampling of SSS (more than 10,000 observations per year …

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On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell Dec 2002

On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell

Faculty Publications

A compliant bistable micromechanism has been developed which can be switched in either direction using on-chip thermal actuation. The energy storage and bistable behavior of the mechanism is achieved through the elastic deflection of compliant segments. The Pseudo-Rigid-Body Model was used for the compliant mechanism design, and for analysis of the large deflection flexible segments. To achieve on-chip actuation, the mechanism design was optimized to allow it to be switched using linear motion thermal actuators. The modeling theory and analysis are presented for three design iterations, with two iterations fabricated in the MUMP's process and the third in the SUMMiT …

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An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long Dec 2002

An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long

Faculty Publications

The scatterometer ocean wind retrieval process produces several possible solutions or ambiguities at each point, requiring a separate ambiguity selection step to infer a unique wind vector field. An ambiguity selection error occurs when the selected wind vector is not the closest ambiguity to the true wind. The current ambiguity selection routine for SeaWinds is ad hoc, but performs well under most circumstances. Factors such as instrument noise and rain can also cause the estimated wind flow to deviate from the true wind. A quality assurance (QA) analysis is performed to assess the ambiguity selection effectiveness and noise level of …

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Introduction Of The 305Arg→305Ser Mutation In The Large Extrinsic Loop E Of The Cp43 Protein Of Synechocystis Sp. Pcc 6803 Leads To The Loss Of Cytochrome C550 Binding To Photosystem Ii, Terry M. Bricker, Andrew Young, Laurie K. Frankel, Cindy Putnam-Evans Dec 2002

Introduction Of The 305Arg→305Ser Mutation In The Large Extrinsic Loop E Of The Cp43 Protein Of Synechocystis Sp. Pcc 6803 Leads To The Loss Of Cytochrome C550 Binding To Photosystem Ii, Terry M. Bricker, Andrew Young, Laurie K. Frankel, Cindy Putnam-Evans

Faculty Publications

CP43, a component of Photosystem II (PSII) in higher plants, algae and cyanobacteria, is encoded by the psbC gene. Previous work demonstrated that alteration of an arginine residue occurring at position 305 to serine produced a strain (R305S) with altered PSII characteristics including lower oxygen-evolving activity, fewer assembled reaction centers, higher sensitivity to photoinactivation, etc. [Biochemistry 38 (1999) 1582]. Additionally, it was determined that the mutant exhibited an enhanced stability of its S2 state. Recently, we observed a significant chloride effect under chloride-limiting conditions. The mutant essentially lost the ability to grow photoautotrophically, assembled fewer fully functional PSII reaction centers …

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Biaxial Strain-Modified Valence And Conduction Band Offsets Of Zinc-Blende Gan, Gap, Gaas, Inn, Inp, And Inas, And Optical Bowing Of Strained Epitaxial Ingan Alloys, Gus L. W. Hart, P. R. C. Kent, Alex Zunger Dec 2002

Biaxial Strain-Modified Valence And Conduction Band Offsets Of Zinc-Blende Gan, Gap, Gaas, Inn, Inp, And Inas, And Optical Bowing Of Strained Epitaxial Ingan Alloys, Gus L. W. Hart, P. R. C. Kent, Alex Zunger

Faculty Publications

Using density-functional calculations, we obtain the (001) biaxial strain dependence of the valence and conduction band energies of GaN, GaP, GaAs, InN, InP, and InAs. The results are fit to a convenient-to-use polynomial and the fits provided in tabular form. Using the calculated biaxial deformation potentials in large supercell empirical psuedopotential calculations, we demonstrate that epitaxial strain reduces the InGaN alloy bowing coefficient compared to relaxed bulk alloys.

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Using Gis For Forest Recreation Planning On The Longleaf Ridge Special Area Of The Angelina National Forest, East Texas, I-Kuai Hung Dec 2002

Using Gis For Forest Recreation Planning On The Longleaf Ridge Special Area Of The Angelina National Forest, East Texas, I-Kuai Hung

Faculty Publications

Longleaf Ridge Special Area (LRSA) located in the Angelina National Forest is the westernmost example of a longleaf pine savanna community. Ecologically, the area is one of the most diverse communities in Texas. Due to its size, abundant natural and historical resources, numerous outdoor recreation opportunities exist. In this study, GIS was used to develop a forest recreation concept plan on LRSA. Most of the geospatial data came from public entities. Information for demand analysis on forest recreation was obtained from the 2000 National Survey on Recreation and the Environment database. U.S. Forest Service recreation fee envelope data were analyzed …

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Predicting The Readability Of Transparent Text, Lauren F. V. Scharff, Albert J. Ahumada Jr. Dec 2002

Predicting The Readability Of Transparent Text, Lauren F. V. Scharff, Albert J. Ahumada Jr.

Faculty Publications

Will a simple global masking model based on image detection be successful at predicting the readability of transparent text? Text readability was measured for two types of transparent text: additive (as occurs in head-up displays) and multiplicative (which occurs in see-through liquid crystal display virtual reality displays). Text contrast and background texture were manipulated. Data from two previous experiments were also included (one using very low contrasts on plain backgrounds, and the other using higher-contrast opaque text on both plain and textured backgrounds). All variables influenced readability in at least an interactive manner. When there were background textures, the global …

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Avian Use Of Chinese Tallow Seeds In Coastal Texas (Abstract), Warren C. Conway Dec 2002

Avian Use Of Chinese Tallow Seeds In Coastal Texas (Abstract), Warren C. Conway

Faculty Publications

The Chinese tallow tree (Sapium sebiferum) (Euphorbiaceae) was introduced into coastal Texas in the late 1800s and forms monotypic woodlands once naturalized. However, few studies have examined avian use of tallow seeds during fall migration in coastal Texas. We documented use of Chinese tallow seeds and compared foraging frequency on Chinese tallow seeds among permanent, summer, and winter residents and migrants. We also tested the hypothesis that Chinese tallow seed germination was enhanced by foraging activities of yellow-rumped warblers (Dendroica coronata), the most common species observed foraging on tallow seeds. During fall migration 1995 and 1996, …

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Rotational Lift: Something Different Or More Of The Same?, Jeffrey A. Walker Phd Dec 2002

Rotational Lift: Something Different Or More Of The Same?, Jeffrey A. Walker Phd

Faculty Publications

This paper addresses the question, do the rotational forces in the hovering fruit fly Drosophila melanogaster reflect something different (the Magnus effect) or more of the same (circulatory-and-attached-vortex force)? The results of an unsteady blade-element model using empirically derived force coefficients from translating (root-oscillating) wings are compared with recent results derived from both the measured forces on a dynamically scaled Drosophila wing and the computational fluid dynamic (CFD)-modeled forces on a virtual Drosophila wing. The behavior of the forces in all three models during wing rotation supports the hypothesis that rotational lift is not a novel aerodynamic mechanism but is …

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Judicial Review In State Supreme Courts: A Comparative Study By Laura Langer, Donald R. Songer Dec 2002

Judicial Review In State Supreme Courts: A Comparative Study By Laura Langer, Donald R. Songer

Faculty Publications

No abstract provided.

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Phylogeny Of Acridocarpus-Brachylophon (Malpighiaceae): Implications For Tertiary Tropical Floras And Afroasian Biogeography, Charles C. Davis, Charles D. Bell, Peter W. Fritsch, Sarah Mathews Dec 2002

Phylogeny Of Acridocarpus-Brachylophon (Malpighiaceae): Implications For Tertiary Tropical Floras And Afroasian Biogeography, Charles C. Davis, Charles D. Bell, Peter W. Fritsch, Sarah Mathews

Faculty Publications

A major tenet of African Tertiary biogeography posits that lowland rainforest dominated much of Africa in the late Cretaceous and was replaced by xeric vegetation as a response to continental uplift and consequent widespread aridification beginning in the late Paleogene. The aridification of Africa is thought to have been a major factor in the extinction of many African humid-tropical lineages, and in the present-day disparity of species diversity between Africa and other tropical regions. This primarily geologically based model can be tested with independent phylogenetic evidence from widespread African plant groups containing both humid- and xeric-adapted species. We estimated the …

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A Large-Area Ccd Camera For The Schmidt Telescope At The Venezuelan National Astronomical Observatory, C. Baltay, J. A. Snyder, P. Andrews, W. Emmet, B. Schaefer, J. Sinnott, C. Bailyn, P. Coppi, A. Oemler, C. N. Sabbey, S. Sofia, W. Van Altena, A. K. Vivas, C. Abad, A. Bongiovanni, C. Briceño, G. Bruzual, F. Della Prugna, G. Magris, Ge Sánchez, Gu Sánchez, H. Schenner, J. Stock, B. Adams, M. Gebhard, R. K. Honeycutt, J. Musser, A. Rengstorff, I. Ferrin, F. Fuenmayor, J. Hernandez, O. Naranjo, P. Rosenzweig Dec 2002

A Large-Area Ccd Camera For The Schmidt Telescope At The Venezuelan National Astronomical Observatory, C. Baltay, J. A. Snyder, P. Andrews, W. Emmet, B. Schaefer, J. Sinnott, C. Bailyn, P. Coppi, A. Oemler, C. N. Sabbey, S. Sofia, W. Van Altena, A. K. Vivas, C. Abad, A. Bongiovanni, C. Briceño, G. Bruzual, F. Della Prugna, G. Magris, Ge Sánchez, Gu Sánchez, H. Schenner, J. Stock, B. Adams, M. Gebhard, R. K. Honeycutt, J. Musser, A. Rengstorff, I. Ferrin, F. Fuenmayor, J. Hernandez, O. Naranjo, P. Rosenzweig

Faculty Publications

We have designed, constructed, and put into operation a large-area CCD camera that covers a large fraction of the image plane of the 1 m Schmidt telescope at Llano del Hato in Venezuela. The camera consists of 16 CCD devices arranged in a 4 × 4 mosaic covering 2.°3 × 3.°5 of sky. The CCDs are 2048 × 2048 LORAL devices with 15 μm pixels. The camera is optimized for drift-scan photometry and objective-prism spectroscopy. The design considerations, construction features, and performance parameters are described in the following paper.

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The C-Function For Non-Compactly Causal Symmetric Spaces, Bernhard Krötz, Gestur Ólafsson Dec 2002

The C-Function For Non-Compactly Causal Symmetric Spaces, Bernhard Krötz, Gestur Ólafsson

Faculty Publications

No abstract provided.

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Wave Packet Spreading: Temperature And Squeezing Effects With Applications To Quantum Measurement And Decoherence, G. W. Ford, R. F. O'Connell Dec 2002

Wave Packet Spreading: Temperature And Squeezing Effects With Applications To Quantum Measurement And Decoherence, G. W. Ford, R. F. O'Connell

Faculty Publications

A localized free particle is represented by a wave packet and its motion is discussed in most quantum mechanics textbooks. Implicit in these discussions is the assumption of zero temperature. We discuss how the effects of finite temperature and squeezing can be incorporated in an elementary manner. The results show how the introduction of simple tools and ideas can bring the reader into contact with topics at the frontiers of research in quantum mechanics. We discuss the standard quantum limit, which is of interest in the measurement of small forces, and decoherence of a mixed ("Schrödinger cat") state, which has …

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Association Of Swim Distance And Age With Body Composition In Adult Female Swimmers, Georgianna Tuuri, Mark Loftin, Jeffrey Oescher Dec 2002

Association Of Swim Distance And Age With Body Composition In Adult Female Swimmers, Georgianna Tuuri, Mark Loftin, Jeffrey Oescher

Faculty Publications

Purpose: The purpose of this investigation was to examine the relationship between average weekly swimming distance and age with body composition in adult female endurance swimmers. Methods: Thirty-five women, aged 21-73 yr. volunteered to participate. Weekly swimming distance was determined from a self-reported exercise log. Body composition was estimated by dual-energy x-ray absorptiometry (DXA), waist circumference, abdominal sagittal diameter, and skinfold thickness measures. Associations between swimming distance and age with body composition were examined using regression analysis. Results: Swimming distance had shared variances as follows: 23% with percent body fat, 26% with waist circumference, 20% with abdominal sagittal diameter, and …

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Coordinated Target Assignment And Intercept For Unmanned Air Vehicles, Erik P. Anderson, Randal W. Beard, Michael A. Goodrich, Timothy W. Mclain Dec 2002

Coordinated Target Assignment And Intercept For Unmanned Air Vehicles, Erik P. Anderson, Randal W. Beard, Michael A. Goodrich, Timothy W. Mclain

Faculty Publications

This paper presents an end-to-end solution to the cooperative control problem represented by the scenario where unmanned air vehicles (UAVs) are assigned to transition through known target locations in the presence of dynamic threats. The problem is decomposed into the subproblems of: 1) cooperative target assignment; 2) coordinated UAV intercept; 3) path planning; 4) feasible trajectory generation; and 5) asymptotic trajectory following. The design technique is based on a hierarchical approach to coordinated control. Simulation results are presented to demonstrate the effectiveness of the approach.

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Review Of Hitler And The Power Of Aesthetics, Michael F. Russo Dec 2002

Review Of Hitler And The Power Of Aesthetics, Michael F. Russo

Faculty Publications

No abstract provided.

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Tectonic And Climatic Evolution Of The Arabian Sea Region: An Introduction, Peter D. Clift, Dick Kroon, Christoph Gaedicke, Jonathan Craig Dec 2002

Tectonic And Climatic Evolution Of The Arabian Sea Region: An Introduction, Peter D. Clift, Dick Kroon, Christoph Gaedicke, Jonathan Craig

Faculty Publications

No abstract provided.

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Nonadditive Genetic Effects In Animal Behavior, Lisa M. Meffert, Sara K. Hicks, Jennifer L. Regan Dec 2002

Nonadditive Genetic Effects In Animal Behavior, Lisa M. Meffert, Sara K. Hicks, Jennifer L. Regan

Faculty Publications

Heritabilities, commonly used to predict evolutionary potential, are notoriously low for behaviors. Apart from strong contributions of environmental variance in reducing heritabilities, the additive genetic components can be very low, especially when they are camouflaged by nonadditive genetic effects. We first report the heritabilities of courtship traits in founder‐flush and control populations of the housefly (Musca domestica L.). We estimated the heritability of each male and female display through the regression of the courtships involving daughters and sons (with randomly selected mates) onto the “midparental” courtship values of their parents. Overall, the average heritability was significantly higher for the …

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Using A Computer Simulation To Teach Science Process Skills To College Biology And Elementary Majors, Aimée T. Lee, Rosalina V. Hairston, Rachel Thames, Tonya Lawrence, Sherry S. Herron Dec 2002

Using A Computer Simulation To Teach Science Process Skills To College Biology And Elementary Majors, Aimée T. Lee, Rosalina V. Hairston, Rachel Thames, Tonya Lawrence, Sherry S. Herron

Faculty Publications

The Lateblight computer simulation (Arneson and Ticknor, 1990) has been implemented in the general biology laboratory and the science methods course for elementary teachers to reinforce the processes of science and to allow the students to engage, explore, explain, elaborate and evaluate the methods of building concepts in science. The students develop testable hypotheses and then use the program to run experiments and collect data. In addition, they research relevant background information and subsequently present their results in a poster during class.

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Bergmann's Rule In Ectotherms: A Test Using Freshwater Fishes, Mark C. Belk, Derek D. Houston Dec 2002

Bergmann's Rule In Ectotherms: A Test Using Freshwater Fishes, Mark C. Belk, Derek D. Houston

Faculty Publications

Understanding patterns of variation in body size within and among species is a central question in evolutionary ecology (Schlichting and Pigliucci 1998). The most well known pattern of variation in body size is Bergmann's rule (Bergmann 1847; Mayr 1956). The intraspecific version of Bergmann's rule holds that within endothermic species, body size increases with increasing latitude (or decreasing temperature; Blackburn et al. 1999; Ashton et al. 2000). In general, mammals conform to this rule (Ashton et al. 2000).

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Urinary Excretion Of Dithiocarbamates And Selfreported Cruciferous Vegetable Intake: Application Of The ‘Method Of Triads’ To A Foodspecific Biomarker, Jay H. Fowke, James R. Hébert, Jed W. Fahey Dec 2002

Urinary Excretion Of Dithiocarbamates And Selfreported Cruciferous Vegetable Intake: Application Of The ‘Method Of Triads’ To A Foodspecific Biomarker, Jay H. Fowke, James R. Hébert, Jed W. Fahey

Faculty Publications

Objective: Greater intake of Cruciferous vegetables (e.g. broccoli) may prevent cancer at several sites. Urinary excretion of isothiocyanate conjugates (dithiocarbamates, DTC) provides a specific biomarker of Cruciferous vegetable consumption suitable for epidemiological investigations. However, no gold-standard referent is available for evaluating urinary DTC levels as an estimator of Cruciferous vegetable consumption. We compared urinary DTC levels to intake as measured by two selfreported dietary assessment techniques. Design: Cruciferous vegetable consumption was measured before and after a behavioural dietary intervention using multiple 24-hour recalls (24HR), a foodcounting questionnaire (VFQ) and urinary DTC excretion levels. Analysis included a structural equation approach (Method …

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