Physical Sciences and Mathematics Commons^™

Research Poster: Tree Population Dynamics At Ash Meadows National Wildlife Refuge: Influences Of Environmental Stress And Disturbance, Sarah L. Karam, Peter J. Weisberg, Stephanie O. Sunderman

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Software Frameworks For Improved Productivity In Climate Change Research, Sohei Okamoto

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: From Lab To Basin Scale: A Look At Changes In Evaporative And Transpirative Processes In Arid And Semi-Arid Shallow Groundwater Systems, Jeremy E. Koonce, Michael H. Young, Dale A. Devitt, Zhongbo Yu

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Trends In Climate Change Education In Nevada's System Of Higher Education, Amy Northrup

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Hydrological Impacts Of Climate Change On Colorado Basin, Peng Jiang, Zhongbo Yu

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Water Source Partitioning For Shrubland Transpiration Using Innovative Field Methods, Amanda Wagner, Dale A. Devitt, Michael Young, Matthew S. Lachniet, Jeremy Koonce, Brian M. Bird

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Nevada System Of Higher Education College Student Climate Change Survey, Jenna Zulauf, Robert Futrell

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Architecture And Usability Aspects Of Environmental Data Portals, Victor Ivanov

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Vulnerability To Climate Change And Policy Support In Rural Nevada, Ahmad Safi

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Supervisor: Dr. William James Smith, Jr. Research poster

Research Poster: Climate Prediction Downscaling Of Temperature And Precipitation In The Great Basin Region, Ramesh Vellore, Benjamin J. Hatchett, Darko Koracin

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Research Poster: Survey Of Environmental Data Portals: Features And Characteristics, David Walker

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster

Climate Change Education For Nevada, David M. Hassenzahl, Michael Collopy, John W. Farley, Paul Buck, Jacque Ewing-Taylor, Shama Perveen

2010 Annual Nevada NSF EPSCoR Climate Change Conference

42 PowerPoint slides Session 1: Education Convener: David Hassenzahl, UNLV Abstract: -Five Year Strategic Plan -Goal 6 - Create a scholarly environment to promote research skills and intellectual development for Nevada educators and students (K-12, undergraduate undergraduate, and graduate) -Primary Strategy - Develop educational infrastructure to train students at all levels and provide public outreach in climate change issues

Cenozoic Mass Extinctions In The Deep Sea; What Disturbs The Largest Habitat On Earth?, Ellen Thomas

Ellen Thomas

No abstract provided.

Annual State Nsf Epscor Climate Change Conference Agenda

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Conference agenda

Sheared Active Fluids: Thickening, Thinning And Vanishing Viscosity, Luca Giomi, Tanniemola B. Liverpool, M. Cristina Marchetti

Physics - All Scholarship

We analyze the behavior of a suspension of active polar particles under shear. In the absence of external forces, orientationally ordered active particles are known to exhibit a transition to a state of non-uniform polarization and spontaneous flow. Such a transition results from the interplay between elastic stresses, due to the liquid crystallinity of the suspension, and internal active stresses. In the presence of an external shear we find an extremely rich variety of phenomena, including an effective reduction (increase) in the apparent viscosity depending on the nature of the active stresses and the flow-alignment property of the particles, as …

Electromagnetic Wave Dynamics In Matter-Wave Superradiant Scattering, Marvin G. Payne, Lu Deng, Edward G. Hagley

Marvin G. Payne

We present a small-signal wave propagation theory on matter-wave superradiant scattering. We show, in a longitudinally excited condensate, that the backward-propagating, superradiantly generated optical field propagates with ultraslow group velocity and that the small-signal gain profile has a Bragg resonance. We further show a unidirectional suppression of optical superradiant scattering, and explain why matter-wave superradiance can occur only when the pump laser is red detuned. This is the first analytical theory on field propagation in matter-wave superradiance that can explain all matter-wave superradiance experiments to date that used a single-frequency, long-pulse, red-detuned laser.

High-Precision U-Pb Zircon Age Calibration Of The Global Carboniferous Time Scale And Milankovitch Band Cyclicity In The Donets Basin, Eastern Ukraine, Vladimir I. Davydov, James L. Crowley, Mark D. Schmitz, Vladislav I. Poletaev

Geosciences Faculty Publications and Presentations

High-precision ID-TIMS U-Pb zircon ages for 12 interstratified tuffs and tonsteins are used to radiometrically calibrate the detailed lithostratigraphic, cyclostratigraphic, and biostratigraphic framework of the Carboniferous Donets Basin of eastern Europe. Chemical abrasion of zircons, use of the internationally calibrated EARTHTIME mixed U-Pb isotope dilution tracer, and improved mass spectrometry guided by detailed error analysis have resulted in an age resolution of

Commissioning And Performance Of The Cms Pixel Tracker With Cosmic Ray Muons, The Cms Collaboration

Physics and Astronomy Publications and Other Works

The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.

A Novel Choline Cotransporter Sequestration Compartment In Cholinergic Neurons Revealed By Selective Endosomal Ablation, Michael T. Ivy, Robert F. Newkirk, Yilun Wang, James G. Townsel

Biology Faculty Research

The sodium-dependent, high affinity choline transporter – choline cotransporter – (ChCoT, aka: cho-1, CHT1, CHT) undergoes constitutive and regulated trafficking between the plasma membrane and cytoplasmic compartments. The pathways and regulatory mechanisms of this trafficking are not well understood. We report herein studies involving selective endosomal ablation to further our understanding of the trafficking of the ChCoT. Selective ablation of early sorting and recycling endosomes resulted in a decrease of ∼75% of [3H]choline uptake and ∼70% of [3H]hemicholinium-3 binding. Western blot analysis showed that ablation produced a similar decrease in ChCoTs in the plasma membrane subcellular fraction. The time frame …

Databases In Courts: The Kenyan Experience, Samwel Otieno Oyuuh

Regis University Student Publications (comprehensive collection)

One of the most significant challenges faced by courts today is managing the performance of their case management system to meet growing case loads efficiently and effectively. There are many different types of technology to help in developing an electronic courtroom, but the underlying technology is the database. Databases are used by courts for maintaining case records, personnel and other court management data. But many conditions such as training and technological infrastructure need to be in place to support successful systems. This work presents the results of a survey of case management operations and practices in Kenya. Current state of …

The Construction And Optimization On An Ion Mobility Spectrometer For The Analysis Of Explosives And Drugs, Hanh Tuyet Lai

FIU Electronic Theses and Dissertations

Today, over 15,000 Ion Mobility Spectrometry (IMS) analyzers are employed at worldwide security checkpoints to detect explosives and illicit drugs. Current portal IMS instruments and other electronic nose technologies detect explosives and drugs by analyzing samples containing the headspace air and loose particles residing on a surface. Canines can outperform these systems at sampling and detecting the low vapor pressure explosives and drugs, such as RDX, PETN, cocaine, and MDMA, because these biological detectors target the volatile signature compounds available in the headspace rather than the non-volatile parent compounds of explosives and drugs. In this dissertation research volatile signature compounds …

Human Adaptive Responses To Catastrophic Landscape Disruptions During The Holocene, Numundo, Png, Jeffrey Parr, William Boyd, Vicki Harriott, Robin Torrence

Jeffrey Parr

Prehistoric land use and social activity in West New Britain, PNG, are well documented, although the landscapes – largely shaped by catastrophic volcanic eruptions – in which these took place, and the relationships people had with these landscapes, are poorly understood. We define the evolving landscape at Numundo, from prior to the Witori-Kimbe 2 eruption (W-K2, ca. 3600 BP) to after the Witori-Kimbe 4 eruption (W-K4, ca. 1400 BP), using fossil phytolith and coral evidence at eight archaeological sites to provide environmental evidence of the human responses to periodic catastrophic events. From ca. 5900 to 3600 BP, all the sites …

Iron(Iii) Accumulations In Inland Saline Waterways, Hunter Valley, Australia: Mineralogy, Micromorphology And Pore-Water Geochemistry, Lloyd Isaacson, Edward Burton, Richard Bush, David Mitchell, Scott Johnston, Bennett Macdonald, Leigh Sullivan, Ian White

Associate Professor Edward D Burton

Discharge of Fe(II)-rich groundwaters into surface-waters results in the accumulation of Fe(III)-minerals in salinized sand-bed waterways of the Hunter Valley, Australia. The objective of this study was to characterise the mineralogy, micromorphology and pore-water geochemistry of these Fe(III) accumulations. Pore-waters had a circumneutral pH (6.2–7.2), were sub-oxic to oxic (Eh 59–453 mV), and had dissolved Fe(II) concentrations up to 81.6 mg L−1. X-ray diffraction (XRD) on natural and acid-ammonium-oxalate (AAO) extracted samples indicated a dominance of 2-line ferrihydrite in most samples, with lesser amounts of goethite, lepidocrocite, quartz, and alumino-silicate clays. The majority of Fe in the samples was bound …

Changes In Water Quality Following Tidal Inundation Of Coastal Lowland Acid Sulfate Soil Landscapes, Scott Johnston, Richard Bush, Leigh Sullivan, Edward Burton, C Smith, Michelle Martens, Angus Mcelnea, Colin Ahern, Bernard Powell, Luisa Stephens, Steven Wilbraham, Simon Van Heel

Associate Professor Edward D Burton

This study examines the remediation of surface water quality in a severely degraded coastal acid sulfate soil landscape. The remediation strategy consisted of partial restoration of marine tidal exchange within estuarine creeks and incremental tidal inundation of acidified soils, plus strategic liming of drainage waters. Time-series water quality and climatic data collected over 5 years were analysed to assess changes in water quality due to this remediation strategy. A time-weighted rainfall function (TWR) was generated from daily rainfall data to integrate the effects of antecedent rainfall on shallow groundwater levels in a way that was relevant to acid export dynamics. …

Iron-Monosulfide Oxidation In Natural Sediments: Resolving Microbially Mediated S Transformations Using Xanes, Electron Microscopy, And Selective Extractions, Edward Burton, Richard Bush, Leigh Sullivan, Rosalie Hocking, David Mitchell, Scott Johnston, R Fitzpatrick, M Raven, S Mcclure, L Yang

Associate Professor Edward D Burton

Iron-monosulfide oxidation and associated S transformations in a natural sediment were examined by combining selective extractions, electron microscopy and S K-edge X-ray absorption near-edge structure (XANES) spectroscopy. The sediment examined in this study was collected from a waterway receiving acid−sulfate soil drainage. It contained a high acid-volatile sulfide content (1031 μmol g−1), reflecting an abundance of iron-monosulfide. The iron-monosulfide speciation in the initial sediment sample was dominated by nanocrystalline mackinawite (tetragonal FeS). At near-neutral pH and an O2 partial pressure of 0.2 atm, the mackinawite was found to oxidize rapidly, with a half-time of 29 ± 2 min. This oxidation …

Mobility Of Arsenic And Selected Metals During Re-Flooding Of Iron- And Organic-Rich Acid-Sulfate Soil, Edward D. Burton, Richard T. Bush, Leigh A. Sullivan, Scott G. Johnston, Rosalie K. Hocking

Associate Professor Edward D Burton

The drainage-induced oxidation of iron-sulfide minerals in acid-sulfate soils has adversely affected large areas of coastal floodplains. Re-flooding of these soils, via the re-establishment of more natural drainage regimes, is a potential remediation approach. Here we describe the mobility of Al, As, Fe, Mn, Ni and Zn during controlled re-flooding of an Fe- and organic-rich acid-sulfate soil material. Soil re-flooding caused the onset of microbially-mediated Fe(III)-reduction, which raised the pH of the initially acidic (pH 3.4) soil to pH 6.0 to 6.5, thereby immobilizing Al. The process of Fe(III)-reduction released high concentrations of FeII and was associated with significant mobilization …

Coupled Carbon Isotopic And Sedimentological Records From The Permian System Of Eastern Australia Reveal The Response Of Atmospheric Carbon Dioxide To Glacial Growth And Decay During The Late Paleozoic Ice Age, Lauren P. Birgenheier, Tracy D. Frank, Christopher R. Fielding, Michael C. Rygel

Department of Earth and Atmospheric Sciences: Faculty Publications

Proxy geochemical records from high-latitude, ice-proximal deposits have the potential to provide key insights into past icehouse climates, but such records are rare. The Permian System of eastern Australia contains a rich record of environmental and climatic changes that occurred in areas proximal to glaciation during the acme and waning stages of the late Paleozoic ice age. Within this succession, a wealth of fine-grained, organic matter-rich facies provides an opportunity to construct a bulk δ¹³C_org record that records changes in atmospheric CO₂ through the Permian. Fluctuations in δ¹³C_org track changes in climate determined …

Applied Statistics: Experience & Cerification In Quality Assurance, Huey D. Dodson

Statistics

The composition of my senior project can be broken down into two parts. The first part of my project, without which the second could not be pursued, involved a 13 week internship at a produce processing facility where I took part in several projects varying in scope and type. The second part was to acquire certification as a Quality Process Analyst from the American Society for Quality.

This document is structured to represent the dichotomous nature of my project; the first section is dedicated to my internship experience, and the second dedicated to the certification examination preparation and completion.

A Natural Missing Link Between Activated And Downhill Protein Folding Scenarios, Feng Liu, Caroline Maynard, Gregory E. Scott, Artem Melnykov, Kathleen B. Hall, Martin Gruebele

Chemistry and Biochemistry

We propose protein PTB1:4W as a good candidate for engineering into a downhill folder. PTB1:4W has a probe-dependent thermal unfolding curve and sub-millisecond T-jump relaxation kinetics on more than one time scale. Its refolding rate in denaturant is a non-linear function of denaturant concentration (curved chevron plot). Yet at high denaturant concentration its unfolding is probe-independent, and the folding kinetics can be fitted to a single exponential decay. The domain appears to fold via a mechanism between downhill folding and activated folding over several small barriers, and when denaturant is added, one of these barriers greatly increases and simplifies the …

A Multiscale And Multidisciplinary Investigation Of Ecosystem- Atmosphere Co2 Exchange Over The Rocky Mountains Of Colorado, Jielun Sun, Steven Oncley, Sean Burns, Britton Stephens, Donald Lenschow, Teresa Campos, Russell Monson, David Schimel, William Sacks, Stephan Dewekker, Chun-Ta Lai, Brian Lamb, Dennis Ojima, Patrick Ellsworth, Leonel Sternberg, Sharon Zhong, Craig Clements, David Moore, Dean Anderson, Andrew Watt, Jia Hu, Mark Tschudi, Steven Aulenbach, Eugene Allwine, Teresa Coons

Faculty Publications, Meteorology and Climate Science

A significant fraction of Earth consists of mountainous terrain. However, the question of how to monitor the surface–atmosphere carbon exchange over complex terrain has not been fully explored. This article reports on studies by a team of investigators from U.S. universities and research institutes who carried out a multiscale and multidisciplinary field and modeling investigation of the CO2 exchange between ecosystems and the atmosphere and of CO2 transport over complex mountainous terrain in the Rocky Mountain region of Colorado. The goals of the field campaign, which included ground and airborne in situ and remote-sensing measurements, were to characterize unique features …