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Utah State University

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2011

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Articles 1 - 30 of 82

Full-Text Articles in Physical Sciences and Mathematics

A New Mass Spectrometer For Upper Atmospheric Measurements In The Auroral Region, Addison E. Everett, James S. Dyer, Mike Watson, Wayne Sanderson, Scott Schicker, Dalon Work, Christopher J. Mertens, Scott M. Bailey, Erik A. Syrstad Dec 2011

A New Mass Spectrometer For Upper Atmospheric Measurements In The Auroral Region, Addison E. Everett, James S. Dyer, Mike Watson, Wayne Sanderson, Scott Schicker, Dalon Work, Christopher J. Mertens, Scott M. Bailey, Erik A. Syrstad

Graduate Student Posters

We have previously presented a new rocket-borne time-of-flight mass spectrometer (TOF-MS) for measurements in the mesosphere / lower thermosphere (MLT). Traditionally, mass spectrometry in the MLT has been difficult, mainly due to the elevated ambient pressures of the MLT and high speeds of a sounding rocket flight, which affect the direct sampling of the ambient atmosphere and spatial resolution. The TOF-MS is a versatile, inherently adaptable, axial-sampling instrument, capable of operating in a traditional TOF mode or in a multiplexing Hadamard-transform mode where high spatial resolution is desired. To minimize bow shock effects at low altitudes (~70-110km), the ram surface …

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Gendered Livelihoods And The Politics Of Socio-Environmental Identity: Women’S Participation In Conservation Projects In Calakmul, Mexico, Claudia Radel Dec 2011

Gendered Livelihoods And The Politics Of Socio-Environmental Identity: Women’S Participation In Conservation Projects In Calakmul, Mexico, Claudia Radel

Environment and Society Faculty Publications

A livelihoods approach positions individuals, situated within households, as active agents within processes occurring at various scales. Environmental conservation efforts represent one such process with direct implications for local sustainable livelihoods and the gendered nature of livelihood strategies. In this article, I examine collective processes of socio-environmental identity construction as gendered sustainable livelihood strategies, articulated in and through the activities of women's agricultural organizations in communities bordering the Calakmul Biosphere Reserve in rural southern Mexico. I present group histories and visual evidence from group activities – adapted from participatory rural appraisal (PRA) methodology – to highlight two important concepts. These …

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Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison Nov 2011

Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison

Presentations

No abstract provided.

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Exploring The Universe… One Electron At A Time, Jr Dennison Nov 2011

Exploring The Universe… One Electron At A Time, Jr Dennison

Presentations

No abstract provided.

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Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison Nov 2011

Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison

Presentations

No abstract provided.

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Fabrication And Performance Of A Microfluidic Traveling-Wave Electrophoresis System, K. D. Jo, J. E. Schiffbauer, Boyd F. Edwards, R. L. Carroll, A. T. Timperman Nov 2011

Fabrication And Performance Of A Microfluidic Traveling-Wave Electrophoresis System, K. D. Jo, J. E. Schiffbauer, Boyd F. Edwards, R. L. Carroll, A. T. Timperman

All Physics Faculty Publications

A microfluidic traveling-wave electrophoresis (TWE) system is reported that uses a locally defined traveling electric field wave within a microfluidic channel to achieve band transport and separation. Low voltages, over a range of −0.5 to +0.5 V, are used to avoid electrolysis and other detrimental redox reactions while the short distance between electrodes, 25 μm, provides high electric fields of 200 V cm−1. It is expected that the low voltage requirements will simplify the future development of smaller portable devices. The TWE device uses four interdigitated electrode arrays: one interdigitated electrode array pair is on the top of …

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From The Big Bang To The Swaner Ecocenter: The Cosmic Biography Of Atoms, Shane L. Larson Oct 2011

From The Big Bang To The Swaner Ecocenter: The Cosmic Biography Of Atoms, Shane L. Larson

Public Talks

No abstract provided.

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Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison Oct 2011

Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison

Presentations

No abstract provided.

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Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison Oct 2011

Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison

Presentations

No abstract provided.

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Temperature Dependence Of Sio2 Electron-Induced Cathodoluminescence, Amberly Evans, Gregory Wilson, John R. Dennison Oct 2011

Temperature Dependence Of Sio2 Electron-Induced Cathodoluminescence, Amberly Evans, Gregory Wilson, John R. Dennison

All Physics Faculty Presentations

No abstract provided.

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Development Of A Passive Sampler For Gaseous Mercury, Mae S. Gustin, Seth N. Lyman, P. Kilner, E. Prestbo Oct 2011

Development Of A Passive Sampler For Gaseous Mercury, Mae S. Gustin, Seth N. Lyman, P. Kilner, E. Prestbo

USU Uintah Basin Faculty Publications

Here we describe work toward development of the components of a cost effective passive sampling system for gaseous Hg that could be broadly deployed by nontechnical staff. The passive sampling system included an external shield to reduce turbulence and exposure to precipitation and dust, a diffusive housing that directly protects the collection surface during deployment and handling, and a collection surface. A protocol for cleaning and deploying the sampler and an analytical method were developed. Our final design consisted of a polycarbonate external shield enclosing a custom diffusive housing made from expanded PTFE tubing. Two collection surfaces were investigated, gold …

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Morse Theory For C*-Algebras: A Geometric Interpretation Of Some Noncommutative Manifolds, Vida Milani, Ali Asghar Rezaei, Seyed M.H. Mansourbeigi Oct 2011

Morse Theory For C*-Algebras: A Geometric Interpretation Of Some Noncommutative Manifolds, Vida Milani, Ali Asghar Rezaei, Seyed M.H. Mansourbeigi

Computer Science Student Research

The approach we present is a modification of the Morse theory for unital C*-algebras. We provide tools for the geometric interpretation of noncommutative CW complexes. Some examples are given to illustrate these geometric information. The main object of this work is a classification of unital C*-algebras by noncommutative CW complexes and the modified Morse functions on them.

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Biogeochemical Response Of Alpine Lakes To A Recent Increase In Dust Deposition In The Southwestern, Us, Ashley P. Ballantyne, Janice Brahney, C. L. Lawrence, J. Saros, Jason C. Neff Sep 2011

Biogeochemical Response Of Alpine Lakes To A Recent Increase In Dust Deposition In The Southwestern, Us, Ashley P. Ballantyne, Janice Brahney, C. L. Lawrence, J. Saros, Jason C. Neff

Watershed Sciences Faculty Publications

The deposition of dust has recently increased significantly over some regions of the western US. Here we explore how changes in dust deposition have affected the biogeochemistry of two alpine watersheds in Colorado, US. We first reconstruct recent changes in the mass accumulation rate of sediments and then we use isotopic measurements in conjunction with a Bayesian mixing model to infer that approximately 95% of the inorganic fraction of lake sediments is derived from dust. Elemental analyses of modern dust indicate that dust is enriched in Ca, Cr, Cu, Mg, Ni, and in one watershed, Fe and P relative to …

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Probing The Cosmos With Light And Gravity: Multi-Messenger Astronomy In The Gravitational Wave Era, Shane L. Larson Sep 2011

Probing The Cosmos With Light And Gravity: Multi-Messenger Astronomy In The Gravitational Wave Era, Shane L. Larson

Colloquia and Seminars

No abstract provided.

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Sources Of Gaseous Oxidized Mercury And Mercury Dry Deposition At Two Southeastern U.S. Sites, Peter S. Weiss-Penzias, Mae S. Gustin, Seth N. Lyman Sep 2011

Sources Of Gaseous Oxidized Mercury And Mercury Dry Deposition At Two Southeastern U.S. Sites, Peter S. Weiss-Penzias, Mae S. Gustin, Seth N. Lyman

USU Uintah Basin Faculty Publications

Wet deposition measurements have shown that relative to other parts of the US, the southeastern region has the highest mercury (Hg) inputs. The source of this Hg has been investigated by multiple researchers and is suggested to be derived from local, regional and global sources. Here we focus on trying to understand potential sources of Hg to this area during periods dominated by dry gaseous oxidized mercury (GOM) deposition. Dry deposition of GOM to a surrogate surface was measured in conjunction with speciated atmospheric Hg, and ancillary parameters from September 2007 through September 2008 at two sites located within 25 …

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Classical Fano Oscillator, D. Mark Riffe Aug 2011

Classical Fano Oscillator, D. Mark Riffe

All Physics Faculty Publications

Starting from the quantum-mechanical Fano-Anderson Hamiltonian, we derive classical equations of motion for coordinates associated with the discrete and continuum states. The frequency-dependent absorption spectrum associated with this classical system exhibits the same Fano line shape as the quantum-mechanical system when appropriate correspondences between classical and quantum variables are made. In the time domain, the response of this classical Fano oscillator depends upon the asymmetry parameter q that appears in the expression for the Fano line shape. In particular, under the influence of impulsive driving of the system, the discrete oscillator's phase changes by ±π/2 as q increases from zero …

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Whispers From The Cosmos: The Dawn Of Gravitational Wave Astronomy, Shane L. Larson Aug 2011

Whispers From The Cosmos: The Dawn Of Gravitational Wave Astronomy, Shane L. Larson

Public Talks

No abstract provided.

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Galaxies: Island Universes In The Cosmos, Shane L. Larson Aug 2011

Galaxies: Island Universes In The Cosmos, Shane L. Larson

Public Talks

No abstract provided.

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Pakistan’S Two-Stage Monsoon And Links With The Recent Climate Change, Shih-Yu (Simon) Wang, Robert Davies, Wan Ru Huang, Robert R. Gillies Aug 2011

Pakistan’S Two-Stage Monsoon And Links With The Recent Climate Change, Shih-Yu (Simon) Wang, Robert Davies, Wan Ru Huang, Robert R. Gillies

Plants, Soils, and Climate Faculty Publications

Meteorological conditions related to the Pakistan floods of 2010 were examined in the context of monsoon dynamics and large‐scale circulations. Case and climatological analyses suggest that summer precipitation in northern Pakistan comprises two distinct phases: (1) a premonsoon trough phase (July) whose rainfall is more episodic and intense, occurring prior to arrival of the monsoon trough, and (2) a monsoon trough phase (August) whose rainfall is persistent, yet less episodic, driven by northward migration of the monsoon trough. Analyses of conditional instability, moisture flux, and circulation features support a persistent increase in conditional instability during the July premonsoon trough phase, …

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Newfield Master Development Plan No. 6, United States Department Of The Interior, Bureau Of Land Management Aug 2011

Newfield Master Development Plan No. 6, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (UT)

This Environmental Assessment (EA) has been prepared to analyze Newfield Production Company's (Newfield) proposed 20-acre infill development project within the Greater Monument Butte Unit (GMBU).

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From The Big Bang To Table Mountain: The Cosmic Biography Of Atoms, Shane L. Larson Jul 2011

From The Big Bang To Table Mountain: The Cosmic Biography Of Atoms, Shane L. Larson

Public Talks

No abstract provided.

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Mercury In The Pelagic And Benthic Food Webs Of The Great Salt Lake, Wayne A. Wurtsbaugh, Erin Fleming, Caleb Izdepski, Jodi Gardberg Jul 2011

Mercury In The Pelagic And Benthic Food Webs Of The Great Salt Lake, Wayne A. Wurtsbaugh, Erin Fleming, Caleb Izdepski, Jodi Gardberg

Watershed Sciences Faculty Publications

No abstract provided.

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Winter Ridge Ha Wild Horse Gather And Removal Plan, United States Department Of The Interior, Bureau Of Land Management Jul 2011

Winter Ridge Ha Wild Horse Gather And Removal Plan, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (UT)

The Winter Ridge HA encompasses approximately 46,500 acres of public and private land, within Grand and Uintah Counties in Utah. The HA is approximately 90 miles south of Vernal, Utah. The BLM has prepared an environmental assessment (EA) to analyze the environmental impacts associated with the gather and removal; refer to DOI-BLM-UT-010-2010-0208.

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Mesospheric Temperature Variability And Seasonal Characteristics Over The Andes, Jonathan Pugmire, Yucheng Zhao, Michael J. Taylor, P D. Pautet Jul 2011

Mesospheric Temperature Variability And Seasonal Characteristics Over The Andes, Jonathan Pugmire, Yucheng Zhao, Michael J. Taylor, P D. Pautet

Graduate Student Posters

The Utah State University CEDAR Mesospheric Temperature Mapper (MTM) is a high-quality CCD imager capable of remote sensing faint optical emissions from the night sky to determine mesospheric temperature and its variability at an altitude of ~87 km. The MTM was operated at the new Andes Lidar Observatory (ALO)located at Cerro Pachon, Chile (30.2° S, 70.7° W) since August 2009 to investigate the seasonal characteristic of the mesopause at mid-latitudes. Measurement were made alongside a powerful lidar capable of height sounding the mesosphere. In this study, the MTM data have been analyzed to determine night to night variability and seasonal …

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The World's Most Sensitive Rayleigh-Scatter Lidar, Leda Sox, V. B. Wickwar, J P. Herron, Marcus J. Bingham, Lance W. Peterson Jul 2011

The World's Most Sensitive Rayleigh-Scatter Lidar, Leda Sox, V. B. Wickwar, J P. Herron, Marcus J. Bingham, Lance W. Peterson

Posters

No abstract provided.

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Stellar Fossils: Globular Clusters As Probes Of The Galaxy, Shane L. Larson Jul 2011

Stellar Fossils: Globular Clusters As Probes Of The Galaxy, Shane L. Larson

Public Talks

No abstract provided.

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Astro Camp Presentation, Get Away Special Team 2011 Jul 2011

Astro Camp Presentation, Get Away Special Team 2011

Education and Outreach

No abstract provided.

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Seasonal Variability And Dynamics Of Mesospheric Gravity Waves Over The Andes, Neal R. Criddle, Michael J. Taylor, P. D. Pautet, Y. Zhao Jun 2011

Seasonal Variability And Dynamics Of Mesospheric Gravity Waves Over The Andes, Neal R. Criddle, Michael J. Taylor, P. D. Pautet, Y. Zhao

Graduate Student Posters

The ALO is a new facility developed for atmospheric research, located at the foot of the Andes mountain range in Cerro Pachon, Chile (30.2°S, 70.7°W). As part of a collaborative program, Utah State has a mesospheric temperature mapper (MTM) on site, which is used to study short period gravity wave dynamics and temperature variations in the mesosphere-lower thermosphere region. The MTM began taking measurements of the OH(6,2) and O2(0,1) spectral bands in August 2009 and a complete profile of seasonal variation in gravity wave characteristics has been created for August 2009 through August 2010 using the OH(6,2) Band. The primary …

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Linking Rates Of Diffusion And Consumption In Relationto Resources, Tal Avgar, Daniel Kuefler, John M. Fryxell Jun 2011

Linking Rates Of Diffusion And Consumption In Relationto Resources, Tal Avgar, Daniel Kuefler, John M. Fryxell

Wildland Resources Faculty Publications

The functional response is a fundamental model of the relationship between consumer intake rate and resource abundance. The random walk is a fundamental model of animal movement and is well approximated by simple diffusion. Both models are central to our understanding of numerous ecological processes but are rarely linked in ecological theory. To derive a synthetic model, we draw on the common logical premise underlying these models and show how the diffusion and consumption rates of consumers depend on elementary attributes of naturally occurring consumer-resource interactions: the abundance, spatial aggregation, and traveling speed of resources as well as consumer handling …

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A Systematic Construction Of Curved Phase Space: A Gravitational Gauge Theory With Symplectic Form, Jeffrey Hazboun, James Thomas Wheeler May 2011

A Systematic Construction Of Curved Phase Space: A Gravitational Gauge Theory With Symplectic Form, Jeffrey Hazboun, James Thomas Wheeler

Presentations

No abstract provided.

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