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2008

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Articles 691 - 720 of 7321

Full-Text Articles in Physical Sciences and Mathematics

Horse Pasture Monitoring Program: Results After Three Years, Tom Keene, S. Ray Smith Oct 2008

Horse Pasture Monitoring Program: Results After Three Years, Tom Keene, S. Ray Smith

Kentucky Grazing Conference

Since 2001-2002 and the outbreak of Mare Reproductive Loss Syndrome (MLRS) the University of Kentucky has been developing stronger ties with the state’s equine industry. Approximately 30% of the foal crop was lost in the Central Bluegrass region during this period with a devastating impact on the industry. Traditionally, many Thoroughbred farms have functioned as independent entities, but MLRS helped them to realize that the University of Kentucky had tremendous amount of expertise that they could provide in the areas of animal health, forage management, and other areas. Initially, there were many theories as to the cause of MLRS with …

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Forage Legumes Vs. Fertilizer Nitrogen, Garry D. Lacefield Oct 2008

Forage Legumes Vs. Fertilizer Nitrogen, Garry D. Lacefield

Kentucky Grazing Conference

A few weeks after I started to work as a Forage Extension Specialist at the University of Kentucky, I heard my mentor and forage idol, Mr. Warren Thompson, speak on forage legumes. Warren, along with Dr’s. Tim Taylor and W.C. Templeton had pioneered the “Pasture Renovation Program” in Kentucky. In addition, Mr. Ed Smith had joined the team and collectively they developed the “Power-til Pasture Renovator.” Warren began his presentation by talking about Kentucky Forages pointing out we were so fortunate to have a good grass base and the opportunity to grow lots of legumes. He also talked about all …

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Growth Of Grasses And Legumes: Impact On Grazing, S. Ray Smith Oct 2008

Growth Of Grasses And Legumes: Impact On Grazing, S. Ray Smith

Kentucky Grazing Conference

The primary, cool season, perennial pasture grasses used in Kentucky are orchardgrass, bluegrass, and tall fescue. When not grazed or harvested, each of these passes through successive stages of growth in the spring: 1) leafy vegetative; 2) boot with seed heads enclosed in leaf sheath; 3) heading when the seed heads begin to show and, 4) bloom when pollination has occurred ( Figure 2). Since fiber and lignin contents increase steadily beyond the vegetative stage, while percent protein and digestibility decrease, a major goal in grazing management is to maintain these grasses in the leafy, vegetative stage at all times. …

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Foreword And Kfgc Award Winners [2008], Garry D. Lacefield, Christi L. Forsythe Oct 2008

Foreword And Kfgc Award Winners [2008], Garry D. Lacefield, Christi L. Forsythe

Kentucky Grazing Conference

No abstract provided.

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Some Significant Wildlife Strikes To Civil Aircraft In The United States, January 1990 – September 2008, Sandra Wright Oct 2008

Some Significant Wildlife Strikes To Civil Aircraft In The United States, January 1990 – September 2008, Sandra Wright

Other Bird Strike and Aviation Materials

The U.S. Department of Agriculture, through an interagency agreement with the Federal Aviation Administration, compiles a database of all reported wildlife strikes to U.S. civil aircraft and to foreign carriers experiencing strikes in the USA. We have compiled over 82,057 strike reports from 1,418 USA airports and 207 foreign airports for January 1990 through December 2007 (7,666 strikes in 2007), but estimate that this represents only about 20% of the strikes that have occurred. The following examples from the database are presented to show the serious impacts that strikes by birds or other wildlife can have on aircraft. These examples, …

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Quenching Of The Exchange Bias Training In Fe/Cr2o3/Fe Trilayer, Sarbeswar Sahoo, Christian Binek Oct 2008

Quenching Of The Exchange Bias Training In Fe/Cr2o3/Fe Trilayer, Sarbeswar Sahoo, Christian Binek

Christian Binek Publications

Exchange bias (EB) and its associated training effects are studied in an epitaxial Fe(10 nm)/Cr2O3(2.7 nm)/Fe(10 nm) trilayer heterostructure grown by molecular beam epitaxy. The EB decreases linearly with increasing temperature from T = 5 K to T = 50 K. It changes sign and becomes positive within 50 K < T < 200 K, finally changing back to regular EB for T<200K up to the highest measured temperature of T = 395 K. Remarkably, the latter is far above the bulk Néel temperature TN = 307 K. EB training effects occur only at 5 K < T < 50 K. We show that this training can be quenched by subjecting the system to DC magnetic field, µ0HDC <= 7 T. The applied field most likely induces a temperature dependent spin-flop transition. Upon its removal the antiferromagnetic Cr2O3 pinning layer evolves uniformly into its quasi-equilibrium spin configuration thus leading to quasi-equilibrium EB.

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Work In Progress: How Do We Teach And Measure Systems Thinking?, Linda Vanasupa, Erika Rogers, Katherine Chen Oct 2008

Work In Progress: How Do We Teach And Measure Systems Thinking?, Linda Vanasupa, Erika Rogers, Katherine Chen

Computer Science and Software Engineering

Since the 1990's blue-ribbon commissions on engineering education have called for educators to graduate engineers who are capable of systems thinking. However, there is sparse information on how to cultivate this type of cognitive development. How do we develop and measure systems thinking? In this paper, we present the first of a series of methods that we are piloting to initiate the systems thinking process. This exercise, developed by Checkland and Scholes and called "Rich Pictures," requires the participant to express a reality in terms of images and connections between these images. We utilized the Rich Pictures exercise in combination …

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On Injectivity Of Quasiregular Mappings, Tadeusz Iwaniec, Leonid V. Kovalev, Jani Onninen Oct 2008

On Injectivity Of Quasiregular Mappings, Tadeusz Iwaniec, Leonid V. Kovalev, Jani Onninen

Mathematics - All Scholarship

We give sufficient conditions for a planar quasiregular mapping to be injective in terms of the range of the differential matrix.

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Transpacific Transport Of Ozone Pollution And The Effect Of Recent Asian Emission Increases On Air Quality In North America: An Integrated Analysis Using Satellite, Aircraft, Ozonesonde, And Surface Observations, D Zhang, D J. Jacob, K F. Boersma, D A. Jaffe, J R. Olson, K W. Bowman, J Worden, A M. Thompson, M A. Avery, Ronald C. Cohen, Jack E. Dibb, F Flocke, H Fuelberg, L Gregory Huey, W W. Mcmillan, H B. Singh, Andrew Weinheimer Oct 2008

Transpacific Transport Of Ozone Pollution And The Effect Of Recent Asian Emission Increases On Air Quality In North America: An Integrated Analysis Using Satellite, Aircraft, Ozonesonde, And Surface Observations, D Zhang, D J. Jacob, K F. Boersma, D A. Jaffe, J R. Olson, K W. Bowman, J Worden, A M. Thompson, M A. Avery, Ronald C. Cohen, Jack E. Dibb, F Flocke, H Fuelberg, L Gregory Huey, W W. Mcmillan, H B. Singh, Andrew Weinheimer

Earth Sciences

We use an ensemble of aircraft, satellite, sonde, and surface observations for April-May 2006 (NASA/INTEX-B aircraft campaign) to better understand the mechanisms for transpacific ozone pollution and its implications for North American air quality. The observations are interpreted with a global 3-D chemical transport model (GEOS-Chem). OMI NO2 satellite observations constrain Asian anthropogenic NOx emissions and indicate a factor of 2 increase from 2000 to 2006 in China. Satellite observations of CO from AIRS and TES indicate two major events of Asian transpacific pollution during INTEX-B. Correlation between TES CO and ozone observations shows evidence for transpacific ozone pollution. The …

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Ex Situ Variable Angle Spectroscopic Ellipsometry Studies On Chemical Vapor Deposited Boron-Doped Diamond Films: Layered Structure And Modeling Aspects, S. Gupta, A. Dudipala, O. A. Williams, K. Haenen, Eric W. Bohannan Oct 2008

Ex Situ Variable Angle Spectroscopic Ellipsometry Studies On Chemical Vapor Deposited Boron-Doped Diamond Films: Layered Structure And Modeling Aspects, S. Gupta, A. Dudipala, O. A. Williams, K. Haenen, Eric W. Bohannan

Chemistry Faculty Research & Creative Works

We report the optical property measurements on boron-doped diamond (BDD) films which were synthesized by microwave plasma-assisted chemical vapor deposition technique on Si (100) using methane in high hydrogen dilution and trimethylboron as precursors with varying boron concentration such that [B] [C]gas =100, 500, 1000, 2000, 4000, and 6467 ppm. These BDD films were investigated using a rotating analyzer variable angle spectroscopic ellipsometry (SE) from the near IR to UV range (830-193 nm). by applying the conventional Bruggeman effective medium approximation and linear regression analyses to the raw SE data that is, [ψ (λi),Δ (λi)] and pseudodielectric function (〈 εr …

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Polymeric Paracest Agents For Enhancing Mri Contrast Sensitivity, Yunkou Wu, Youfu Zhou, Olivier Quari, Mark Woods, Piyu Zhao, Todd B. Soesbe, Garry Kiefer, A. Dean Sherry Oct 2008

Polymeric Paracest Agents For Enhancing Mri Contrast Sensitivity, Yunkou Wu, Youfu Zhou, Olivier Quari, Mark Woods, Piyu Zhao, Todd B. Soesbe, Garry Kiefer, A. Dean Sherry

Chemistry Faculty Publications and Presentations

Linear polymers of PARACEST agents were prepared by using classical free radical chain polymerization conditions. The Eu3+-polymers exhibited similar intermediate-to-slow water exchange and CEST characteristics as the Eu3+-monomers. This provided an avenue to lower the detection limit of these imaging agents substantially and makes them potentially useful as MRI sensors for molecular imaging.

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Adaptive Management Report For The Clark County, Nevada Multiple Species Habitat Conservation Plan, Desert Conservation Program Oct 2008

Adaptive Management Report For The Clark County, Nevada Multiple Species Habitat Conservation Plan, Desert Conservation Program

Publications (C)

The Desert Conservation Program administers an incidental take permit for desert tortoise and 77 other species. The permit was issued in 2001 by the United States Fish and Wildlife Service in accordance with the Endangered Species Act. Compliance with the permit requires implementation of the Clark County Multiple Species Habitat Conservation Plan. This plan requires an adaptive management program and a biennial report by an independent science advisor to assess the status of the plan and make recommendations for future funding. The 2008 Adaptive Management Report reviews current data on land use trends, habitat loss, species status, plan implementation, programmatic …

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Multilevel Latent Class Models With Dirichlet Mixing Distribution, Chongzhi Di, Karen Bandeen-Roche Oct 2008

Multilevel Latent Class Models With Dirichlet Mixing Distribution, Chongzhi Di, Karen Bandeen-Roche

Johns Hopkins University, Dept. of Biostatistics Working Papers

Latent class analysis (LCA) and latent class regression (LCR) are widely used for modeling multivariate categorical outcomes in social sciences and biomedical studies. Standard analyses assume data of different respondents to be mutually independent, excluding application of the methods to familial and other designs in which participants are clustered. In this paper, we develop multilevel latent class model, in which subpopulation mixing probabilities are treated as random effects that vary among clusters according to a common Dirichlet distribution. We apply the Expectation-Maximization (EM) algorithm for model fitting by maximum likelihood (ML). This approach works well, but is computationally intensive when …

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Tree Ring Dating Of The Kline Barn, Fredericksburg, Oh Oct 2008

Tree Ring Dating Of The Kline Barn, Fredericksburg, Oh

Historic Structures

Dating historical structures in Holmes County, Ohio using dendrochronology. The Historical Structures collection consists of reports that are the result of dendochronological analysis of timbers from structures in Pennsylvania and Ohio. Contributors: Climate Change Class; Wiles, Greg

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Sensitivity Of Pdr Calculations To Microphysical Details, N. P. Abel, P. A. M. Van Hoof, G. Shaw, Gary J. Ferland, T. Elwert Oct 2008

Sensitivity Of Pdr Calculations To Microphysical Details, N. P. Abel, P. A. M. Van Hoof, G. Shaw, Gary J. Ferland, T. Elwert

Physics and Astronomy Faculty Publications

Our understanding of physical processes in photodissociation regions or photon-dominated regions (PDRs) largely depends on the ability of spectral synthesis codes to reproduce the observed infrared emission-line spectrum. In this paper, we explore the sensitivity of a single PDR model to microphysical details. Our calculations use the Cloudy spectral synthesis code, recently modified to include a wealth of PDR physical processes. We show how the chemical/thermal structure of a PDR, along with the calculated spectrum, changes when the treatment of physical processes such as grain physics and atomic/molecular rates are varied. We find a significant variation in the intensities of …

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Relationship Web: Trailblazing, Analytics And Computing For Human Experience, Amit P. Sheth Oct 2008

Relationship Web: Trailblazing, Analytics And Computing For Human Experience, Amit P. Sheth

Kno.e.sis Publications

This panel presentation was give at the 27th International Conference on Conceptual Modeling (ER 2008), Barcelona, Spain, October 20-23, 2008.

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Using Vagueness Measures To Re-Rank Documents Retrieved By A Fuzzy Set Information Retrieval Model, Stephen Lynn, Yiu-Kai D. Ng Oct 2008

Using Vagueness Measures To Re-Rank Documents Retrieved By A Fuzzy Set Information Retrieval Model, Stephen Lynn, Yiu-Kai D. Ng

Faculty Publications

Traditional information retrieval (IR) systems evaluate user queries and retrieve/rank documents based on matching keywords in user queries with words in documents. These exact word-matching and ranking approaches ignore too many relevant documents that do not contain the exact keywords as specified in a user query. Instead of considering these traditional approaches, we propose to retrieve documents using a fuzzy set IR model and rank retrieved documents for any vague query using the “vagueness score” of the documents based on the word senses as defined in WordNet. Using the vagueness scores, we rank the most highest “relevant” documents of a …

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Seasonal Variations Of Semidiurnal Tidalperturbations In Mesopause Region Temperature And Zonal And Meridional Winds Above Fort Collins, Colorado(40.6°N, 105.1°W), Tao Yuan, H. Schmidt, C. Y. She, D. A. Krueger, S. Reising Oct 2008

Seasonal Variations Of Semidiurnal Tidalperturbations In Mesopause Region Temperature And Zonal And Meridional Winds Above Fort Collins, Colorado(40.6°N, 105.1°W), Tao Yuan, H. Schmidt, C. Y. She, D. A. Krueger, S. Reising

All Physics Faculty Publications

On the basis of Colorado State University (CSU) Na lidar observations over full diurnal cycles from May 2002 to April 2006, a harmonic analysis was performed to extract semidiurnal perturbations in mesopause region temperature and zonal and meridional winds over Fort Collins, Colorado (40.6°N, 105.1°W). The observed monthly results are in good agreement with MF radar tidal climatology for Urbana, Illinois, and with predictions of the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA), sampled at the CSU Na lidar coordinates. The observed semidiurnal tidal period perturbation within the mesopause region is found to be dominated by propagating modes …

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Neutralino Dark Matter From Indirect Detection Revisited, Scott Watson, Phill Grajek, Gordon Kane, Daniel J. Phalen, Aaron Pierce Oct 2008

Neutralino Dark Matter From Indirect Detection Revisited, Scott Watson, Phill Grajek, Gordon Kane, Daniel J. Phalen, Aaron Pierce

Physics - All Scholarship

We revisit indirect detection possibilities for neutralino dark matter, emphasizing the complementary roles of different approaches. While thermally produced dark matter often requires large astrophysical "boost factors" to observe antimatter signals, the physically motivated alternative of non-thermal dark matter can naturally provide interesting signals, for example from light wino or Higgsino dark matter. After a brief review of cosmic ray propagation, we discuss signals for positrons, antiprotons, synchrotron radiation and gamma rays from wino annihilation in the galactic halo, and examine their phenomenology. For pure wino dark matter relevant to the LHC, PAMELA and GLAST should report signals.

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Chameleon: Context-Awareness Inside Dbmss, Hicham G. Elmongui, Walid G. Aref, Mohamed F. Mokbel Oct 2008

Chameleon: Context-Awareness Inside Dbmss, Hicham G. Elmongui, Walid G. Aref, Mohamed F. Mokbel

Department of Computer Science Technical Reports

No abstract provided.

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Direct Observation Of H2 Binding To A Metal Oxide Surface, J. Z. Larese, T. Arnold, L. Frazier, R. J. Hinde, A. J. Ramirez-Cuesta Oct 2008

Direct Observation Of H2 Binding To A Metal Oxide Surface, J. Z. Larese, T. Arnold, L. Frazier, R. J. Hinde, A. J. Ramirez-Cuesta

Chemistry Publications and Other Works

Inelastic neutron scattering is used to probe the dynamical response of H2 films adsorbed on MgO(100) as a function of film thickness. Concomitant diffraction measurements and a reduced-dimensionality quantum dynamical model provide insight into the molecule-surface interaction potential. At monolayer thickness, the rotational motion is strongly influenced by the surface, so that the molecules behave like quasiplanar rotors. These findings have a direct impact on understanding how molecular hydrogen binds to the surface of materials used in catalytic and storage applications.

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Hydrologic And Water Quality Monitoring On Turkey Creek Watershed, Francis Marion National Forest, Sc, D M. Amatya, T J. Callahan, A Radecki-Pawlik, P Drewes, C Trettin, W F. Hansen Oct 2008

Hydrologic And Water Quality Monitoring On Turkey Creek Watershed, Francis Marion National Forest, Sc, D M. Amatya, T J. Callahan, A Radecki-Pawlik, P Drewes, C Trettin, W F. Hansen

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Cooperative Restoration Programs In Critical Habitats In The Upper South Carolina Coastal Region, J M. Whetstone, C L. Page, C A. Gresham, M C. Nespeca Oct 2008

Cooperative Restoration Programs In Critical Habitats In The Upper South Carolina Coastal Region, J M. Whetstone, C L. Page, C A. Gresham, M C. Nespeca

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Preparing For The Worst: Integrated Drought Planning For A Sc Water Utility In The Age Of Water Scarcity, Hope Walker, Robert Osborne, Clint Shealy, Mike Caston, Billy Cothran Oct 2008

Preparing For The Worst: Integrated Drought Planning For A Sc Water Utility In The Age Of Water Scarcity, Hope Walker, Robert Osborne, Clint Shealy, Mike Caston, Billy Cothran

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Managing Water Supply In Turbulent Times, David T. Zimmer Oct 2008

Managing Water Supply In Turbulent Times, David T. Zimmer

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Private Property, Public Resource, Public Problem: The Role Of Participation In Developing Innovative Stormwater Management Approaches In Aiken, South Carolina, Victoria Chanse Oct 2008

Private Property, Public Resource, Public Problem: The Role Of Participation In Developing Innovative Stormwater Management Approaches In Aiken, South Carolina, Victoria Chanse

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Potable Water Needs In The Aftermath Of A Disaster: A Case Study From The 2005 Tsunami Relief Effort In Sri Lanka And Hurricane Katrina Relief Effort, G C. Greene Iv Oct 2008

Potable Water Needs In The Aftermath Of A Disaster: A Case Study From The 2005 Tsunami Relief Effort In Sri Lanka And Hurricane Katrina Relief Effort, G C. Greene Iv

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Human Health & Water Issues - Micro & Macro: Harmful Algal Blooms, Climate Change & Infectious Diseases Disaster-Related H20 Injuries, Illnesses, Robert Ball Oct 2008

Human Health & Water Issues - Micro & Macro: Harmful Algal Blooms, Climate Change & Infectious Diseases Disaster-Related H20 Injuries, Illnesses, Robert Ball

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Alcoa-Mt. Holly Zero Process Water Discharge Using Phytotechnology, Lauren Schmelter Oct 2008

Alcoa-Mt. Holly Zero Process Water Discharge Using Phytotechnology, Lauren Schmelter

S.C. Water Resources Conference

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Region

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Modelling Growth And Predicting Future Developed Land In The Upstate Of South Carolina, Craig E. Campbell, Jeffery Allen, Kang Shou Lu Oct 2008

Modelling Growth And Predicting Future Developed Land In The Upstate Of South Carolina, Craig E. Campbell, Jeffery Allen, Kang Shou Lu

S.C. Water Resources Conference

2008 S.C. Water Resources Conference Addressing Water Challenges Facing the State and Region

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