Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

Utah State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 3781 - 3810 of 7344

Full-Text Articles in Physical Sciences and Mathematics

A Novel Joint Space-Wavenumber Analysis Of An Unusual Antarctic Gravity Wave Event, R. G. Stockwell, Michael J. Taylor, K. Nielsen, M. J. Jarvis Apr 2006

A Novel Joint Space-Wavenumber Analysis Of An Unusual Antarctic Gravity Wave Event, R. G. Stockwell, Michael J. Taylor, K. Nielsen, M. J. Jarvis

All Physics Faculty Publications

As part of a collaborative research program between British Antarctic Survey, U.K. and Utah State University, USA, all sky airglow images were recorded at Halley Station Antarctica (75.5 S, 26.7 W). An unusual mesospheric gravity wave event was observed in the OH nightglow (nominal height 87 km) over a period of 3 hours on the 27–28 May, 2001. The characteristics of the bore wave event were determined by application of the one dimensional spatial S-Transform analysis. This is the first time such analysis has been performed on airglow data. By employing these local spatial spectral analysis, the evolution of the …

Go to article

Seasonal Variation Of Diurnal Perturbations In Mesopause Regiontemperature, Zonal, And Meridional Winds Above Fort Collins, Colorado (40.6°N, 105°), Tao Yuan, C. Y. She, M. E. Hagan, B. P. William, T. Li, K. Arnold, T. D. Kawahara, P. E. Acott, J. D. Vance, D. A. Krueger, R. G. Roble Mar 2006

Seasonal Variation Of Diurnal Perturbations In Mesopause Regiontemperature, Zonal, And Meridional Winds Above Fort Collins, Colorado (40.6°N, 105°), Tao Yuan, C. Y. She, M. E. Hagan, B. P. William, T. Li, K. Arnold, T. D. Kawahara, P. E. Acott, J. D. Vance, D. A. Krueger, R. G. Roble

All Physics Faculty Publications

On the basis of lidar observations from May 2002 through April 2003, covering both day and night, we performed a harmonic analysis to extract the diurnal perturbations in mesopause region temperature, zonal and meridional winds over Fort Collins, Colorado (40.6°N, 105°W), binned every 2 months. The results were compared to predictions of the 2000 and 2002 versions of Global-Scale Wave Model (GSWM00 and GSWM02). The diurnal tidal period oscillations showed a mixture of propagating and evanescent (trapped) modes, but the propagating modes dominated for most of the year. The agreement in temperature diurnal phases between observation and GSWM prediction is …

Go to article

Sneak Preview: Bear River Watershed Historical Digital Collection, Cheryl D. Walters, Cheryl D. Walters Mar 2006

Sneak Preview: Bear River Watershed Historical Digital Collection, Cheryl D. Walters, Cheryl D. Walters

Library Faculty & Staff Publications

Provides early look at a new digital collection assembling image and text resources about the Bear River Watershed in Utah and Idaho.

Go to article

Scoping Summary Report: Development Of Lower Basin Shortage Guidelines And Coordinated Management Strategies For Lake Powell And Lake Mead, Particularly Under Low Reservoir Conditions, U.S. Department Of The Interior, Bureau Of Reclamation Mar 2006

Scoping Summary Report: Development Of Lower Basin Shortage Guidelines And Coordinated Management Strategies For Lake Powell And Lake Mead, Particularly Under Low Reservoir Conditions, U.S. Department Of The Interior, Bureau Of Reclamation

All U.S. Government Documents (Utah Regional Depository)

The Bureau of Reclamation (Reclamation) acting on behalf of the Secretary of the Department of the Interior (Secretary) proposes to take action to adopt specific Colorado River Lower Basin shortage guidelines and coordinated reservoir management strategies to address operations of Lake Powell and Lake Mead, particularly under low reservoir conditions. This proposed Action will provide a greater degree of certainty to all water users and managers in the Colorado River Basin by providing more detailed guidelines for the operation of Lake Powell and Lake Mead and by allowing water users in the Lower Basin to know when, and by how …

Go to article

Summary Of Public Scoping Comments For The Oil Shale And Tar Sands Resources Leasing Programmatic Environmental Impact Statement, Argonne National Laboratory Mar 2006

Summary Of Public Scoping Comments For The Oil Shale And Tar Sands Resources Leasing Programmatic Environmental Impact Statement, Argonne National Laboratory

All U.S. Government Documents (Utah Regional Depository)

Section 369(d)(1) of the Energy Policy Act of 2005, Public Law 109-58 (H.R. 6), enacted August 8, 2005, directs the Secretary of the Interior to prepare a programmatic environmental impact statement (PEIS) for a commercial leasing program for oil shale and tar sands (OSTS) resources on public lands in Colorado, Utah, and Wyoming (see Figure 1). Through the Oil Shale and Tar Sands Resources Leasing PEIS, the U.S. Department of the Interior, Bureau of Land Management (BLM) will evaluate decisions regarding which public lands will be open for leasing in the three-state area and under what constraints. The PEIS will …

Go to article

Zion National Park Environment Assessment/ Assessment Of Effect, Engineering-Environmental Management, Inc. Feb 2006

Zion National Park Environment Assessment/ Assessment Of Effect, Engineering-Environmental Management, Inc.

Elusive Documents

This environmental assessment I assessment of effect examines in detail two alternatives: no action and the National Park Service preferred alternative. The preferred alternative considers rehabilitation of the roadway and associated structures on either side of Route 10 (Zion-Mt. Carmel Highway) tunnel. The road work would primarily occur on the east side of the tunnel in a 0.25-mile segment beginning at the east tunnel entrance. Modifications on the east side of the tunnel would include slurry sealing the road surface and scaling rock slopes on both sides of the road; re-configuring two parking areas; creating a painted center median with …

Go to article

Evolution Of Equatorial Ionospheric Bubbles During A Large Auroral Electrojet Increase In The Recovery Phase Of A Magnetic Storm, M. J. Keskinen, S. L. Ossakow, Bela G. Fejer, J. Emmert Feb 2006

Evolution Of Equatorial Ionospheric Bubbles During A Large Auroral Electrojet Increase In The Recovery Phase Of A Magnetic Storm, M. J. Keskinen, S. L. Ossakow, Bela G. Fejer, J. Emmert

Bela G. Fejer

[1] We present a model and observations of the evolution of equatorial ionospheric bubbles during a large auroral electrojet (AE) index increase in the recovery phase of a geomagnetic storm. Using a three-dimensional time-dependent numerical simulation model, we find, for the 19–21 October 1998 storm, that the equatorial bubble evolution is different during storm time as compared to quiet time conditions. We have found that the storm time vertical drift in conjunction with reduced off-equatorial E region shorting is the primary mechanism that distinguishes the large AE increase recovery phase storm time evolution from the quiet time case. Comparison of …

Go to article

Electron Transport In Laterally Confined Phosphorus Δ-Layers In Silicon, S. J. Robinson, J. S. Kline, H. J. Wheelwright, J. R. Tucker, C. L. Yang, R. R. Du, B. E. Volland, I. W. Rangelow, T. -C. Shen Jan 2006

Electron Transport In Laterally Confined Phosphorus Δ-Layers In Silicon, S. J. Robinson, J. S. Kline, H. J. Wheelwright, J. R. Tucker, C. L. Yang, R. R. Du, B. E. Volland, I. W. Rangelow, T. -C. Shen

T. -C. Shen

Two-dimensional electron systems fabricated from a single layer of P-donors have been lithographically confined to nanometer scale in lateral directions. The electronic transport of such quasi-one-dimensional systems with and without a perpendicular magnetic field was characterized at cryogenic temperatures. Experimental data fit well with two-dimensional weak localization and interaction theory when the phase coherence length is shorter than the smaller dimension of the confinement. Below a transition temperature the wire conductance saturates.

Go to article

Salinity Controls Phytoplankton Response To Nutrient Enrichment In The Great Salt Lake, Utah, Usa, Amy M. Marcarelli, Wayne A. Wurtsbaugh, O. Griset Jan 2006

Salinity Controls Phytoplankton Response To Nutrient Enrichment In The Great Salt Lake, Utah, Usa, Amy M. Marcarelli, Wayne A. Wurtsbaugh, O. Griset

Watershed Sciences Faculty Publications

To examine how salinity and nutrient supply interact to control phytoplankton community composition, nutrient limitation, and dinitrogen (N2) fixation rates in the Great Salt Lake (Utah, USA), we conducted a series of bioassay experiments with plankton from both Gilbert Bay, where salinities are near 160 g·L–1, and Farmington Bay, where salinities range from 10 to 90 g·L–1. Six-day nutrient addition bioassay experiments showed that the extant phyto plankton communities in both bays were limited by nitrogen (N). However, in 28- to 30-day factorial bioassay experiments in which both salinities and nutrient supply were manipulated, phosphorus stimulated chlorophyll a as much …

Go to article

Spatial Analyses Of Trophic Linkages Between Basins In The Great Salt Lake, Wayne A. Wurtsbaugh, David Naftz, Shane Bradt Jan 2006

Spatial Analyses Of Trophic Linkages Between Basins In The Great Salt Lake, Wayne A. Wurtsbaugh, David Naftz, Shane Bradt

Watershed Sciences Faculty Publications

Although the Great Salt Lake is frequently treated as if it were a single body of water, the natural bays and transportation causeways have divided it into a system of four bays. The bays, however, do not function independently because water, nutrients and other contaminants flow between them. The purpose of our study was to analyze the water quality in three of the bays (Farmington, Bear River and Gilbert), to determine fluxes of nutrients between them, and to determine how this was influencing brine shrimp populations in the lake. Discharge and nutrient concentrations were measured at constrictions separating the three …

Go to article

Wavelet-Based Index Of Magnetic Storm Activity, A. Jach, Piotr Kokoszka, Jan Josef Sojka, Lie Zhu Jan 2006

Wavelet-Based Index Of Magnetic Storm Activity, A. Jach, Piotr Kokoszka, Jan Josef Sojka, Lie Zhu

All Physics Faculty Publications

A wavelet-based method of computing an index of storm activity is put forward. The new index can be computed automatically using statistical procedures and does not require selecting quiet days and removing the secular component by polynomial fitting. This 1-min index is designed to facilitate the study of the fine structure of geomagnetic storm events and requires only the most recent magnetogram records, e.g., the 2 months including the storm event of interest. It can thus be computed over a moving window as soon as new magnetogram records become available. Averaged over 1-hour periods, it is practically indistinguishable from the …

Go to article

Utah State University Global Assimilation Of Ionospheric Measurements Gauss-Markov Kalman Filter Model Of The Ionosphere: Model Description And Validation, Ludger Scherliess, Robert W. Schunk, Jan Josef Sojka, Donald C. Thompson, Lie Zhu Jan 2006

Utah State University Global Assimilation Of Ionospheric Measurements Gauss-Markov Kalman Filter Model Of The Ionosphere: Model Description And Validation, Ludger Scherliess, Robert W. Schunk, Jan Josef Sojka, Donald C. Thompson, Lie Zhu

All Physics Faculty Publications

The Utah State University Gauss-Markov Kalman Filter (GMKF) was developed as part of the Global Assimilation of Ionospheric Measurements (GAIM) program. The GMKF uses a physics-based model of the ionosphere and a Gauss-Markov Kalman filter as a basis for assimilating a diverse set of real-time (or near real-time) observations. The physics-based model is the Ionospheric Forecast Model (IFM), which accounts for five ion species and covers the E region, F region, and the topside from 90 to 1400 km altitude. Within the GMKF, the IFM derived ionospheric densities constitute a background density field on which perturbations are superimposed based on …

Go to article

Anomalous F Region Response To Moderate Solar Flares, C. G. Smithtro, Jan Josef Sojka, T. Berkey, Donald C. Thompson, Robert W. Schunk Jan 2006

Anomalous F Region Response To Moderate Solar Flares, C. G. Smithtro, Jan Josef Sojka, T. Berkey, Donald C. Thompson, Robert W. Schunk

All Physics Faculty Publications

Ionograms recorded with a dynasonde at Bear Lake Observatory, Utah, during moderate solar x-ray flares exhibit characteristic enhancements to the E and F 1 region ionosphere. However, during these same flares, the peak electron density of the ionosphere (N m F 2) unexpectedly decreases, recovering after the flare ends. In order to reconcile this anomalous behavior with expected increases to the total electron content (TEC), we undertake a modeling effort using the Time-Dependent Ionospheric Model (TDIM) developed at Utah State University. For solar input, a simple flare time irradiance model is created, using measurements from the Solar EUV Experiment instrument …

Go to article

Probability Tails Of Wavelet Coefficients Of Magnetometer Records, Piotr Kokoszka, I. Maslova, Jan Josef Sojka, Lie Zhu Jan 2006

Probability Tails Of Wavelet Coefficients Of Magnetometer Records, Piotr Kokoszka, I. Maslova, Jan Josef Sojka, Lie Zhu

All Physics Faculty Publications

The ground-based magnetometer network has long been a powerful tool for monitoring and observing the variations of the currents flowing in the magnetosphere-ionosphere (M-I) system. The time series of magnetograms are nonstationary and their frequency behavior changes over time. They are therefore not amenable to traditional time domain or spectral (Fourier) analysis. In recent years, various new mathematical techniques have been developed to analyze magnetometer data and the wavelet technique has stood out as being particularly relevant. In order to correctly make statistical inferences based on wavelet analysis, the wavelet coefficient distributions of magnetograms must be examined. In this work, …

Go to article

Uniqueness Of Solutions To The Helically Reduced Wave Equation With Sommerfeld Boundary Conditions, Charles G. Torre Jan 2006

Uniqueness Of Solutions To The Helically Reduced Wave Equation With Sommerfeld Boundary Conditions, Charles G. Torre

All Physics Faculty Publications

We consider the helical reduction of the wave equation with an arbitrary source on (n+1)-dimensional Minkowski space, n ≥ 2. The reduced equation is of mixed elliptic-hyperbolic type on Rn. We obtain a uniqueness theorem for solutions on a domain consisting of an n-dimensional ball B centered on the reduction of the axis of helical symmetry and satisfying ingoing or outgoing Sommerfeld conditions on ∂B ≈ Sn−1. Nonlinear generalizations of such boundary value problems (with n = 3) arise in the intermediate phase of binary inspiral in general relativity.

Go to article

Observables For The Polarized Gowdy Model, Charles G. Torre Jan 2006

Observables For The Polarized Gowdy Model, Charles G. Torre

All Physics Faculty Publications

We give an explicit characterization of all functions on the phase space for the polarized Gowdy 3-torus spacetimes which have weakly vanishing Poisson brackets with the Hamiltonian and momentum constraint functions.

Go to article

E-Field Dependent Conduction In Low-Density Polyethylene, Jerilyn Brunson, John R. Dennison Jan 2006

E-Field Dependent Conduction In Low-Density Polyethylene, Jerilyn Brunson, John R. Dennison

All Physics Faculty Publications

Measurements of the resistivity of low density polyethylene (LDPE) samples of varying thickness have been made using the standard constant voltage method to explore electric field dependence using conduction mechanisms developed for amorphous solids and semi-conductors. Resistivity is related to carrier mobility within the bulk. Where electrons are the primary charge carriers, their mobility is dependent on their probability of hopping between trapping sites treated as potential wells. A series of constant voltage measurements at constant temperature show that LDPE follows the Poole-Frenkel theory of field-enhanced conduction at low applied fields.

Go to article

Gravitational Waves: Just Plane Symmetry, Charles G. Torre Jan 2006

Gravitational Waves: Just Plane Symmetry, Charles G. Torre

All Physics Faculty Publications

In four spacetime dimensions gravitational plane waves (a special case of the plane-fronted waves with parallel rays) admit a 5 parameter isometry group. We generalize this group to n-dimensions and explore some special features of spacetimes admitting this isometry group. In particular, it is shown that every generally covariant rank-2 symmetric tensor field constructed from a metric with plane wave symmetry will vanish except multiples of the metric and Ricci tensors. We show that, in four spacetime dimensions, a particular enlargement of the plane wave symmetry group is enough to force the group-invariant metrics to satisfy all generally covariant vacuum …

Go to article

Validation Study Of The Ionospheric Forecast Model Using The Topex Tec Measurements, L. Zhu, Robert W. Schunk, G. Jee, Ludger Scherliess, Jan Josef Sojka, Donald C. Thompson Jan 2006

Validation Study Of The Ionospheric Forecast Model Using The Topex Tec Measurements, L. Zhu, Robert W. Schunk, G. Jee, Ludger Scherliess, Jan Josef Sojka, Donald C. Thompson

All Physics Faculty Publications

As a part of the validation program in the Utah State University Global Assimilation of Ionospheric Measurement (GAIM) project, a newly improved Ionosphere Forecast Model (IFM) was systematically validated by using a large database of TOPEX total electron content (TEC) measurements. The TOPEX data used for the validation are for the period from August 1992 to March 2003, and the total number of 18-s averaged data is close to 11 million. This model validation work covers a wide range of seasonal (winter, summer, and equinox) and solar (low-F 10.7, median F 10.7, and high-F 10.7) conditions as well as all …

Go to article

Extreme Longitudinal Variability Of Plasma Structuring In The Equatorial Ionosphere On A Magnetically Quiet Equinoctial Day, Sarah E. Mcdonald, Sunanda Basu, Santimay Basu, Keith M. Groves, Cesar E. Valladares, Ludger Scherliess, Donald C. Thompson, Robert W. Schunk, Jan Josef Sojka Jan 2006

Extreme Longitudinal Variability Of Plasma Structuring In The Equatorial Ionosphere On A Magnetically Quiet Equinoctial Day, Sarah E. Mcdonald, Sunanda Basu, Santimay Basu, Keith M. Groves, Cesar E. Valladares, Ludger Scherliess, Donald C. Thompson, Robert W. Schunk, Jan Josef Sojka

All Physics Faculty Publications

We investigate the extreme longitudinal variability of equatorial scintillation under quiet magnetic conditions during 22–23 March 2002. Scintillation Network Decision Aid (SCINDA) observations show intense activity in the South American–Atlantic sector during local evening hours, whereas an absence of scintillation is seen in the far east Asian sector. Ground- and space-based measurements from SCINDA, the Global Ultraviolet Imager (GUVI), TOPEX, and a chain of GPS receivers are used in combination with the Utah State University Global Assimilation of Ionospheric Measurements (USU-GAIM) model to explore the relationship between the large-scale ionization distribution and small-scale irregularities at low latitudes in both the …

Go to article

Biconformal Matter Actions, A. Wehner, James Thomas Wheeler Jan 2006

Biconformal Matter Actions, A. Wehner, James Thomas Wheeler

All Physics Faculty Publications

We extend 2n-dim biconformal gauge theory by including Lorentz-scalar matter fields of arbitrary conformal weight. We show that for a massless scalar field of conformal weight zero in a torsion-free biconformal geometry, the solution is determined by the Einstein equation on an n-dim submanifold, with the stress-energy tensor of the scalar field as source. The matter field satisfies the n-dim Klein-Gordon equation.

Go to article

Science Icebreaker Activities: An Example From Gravitational Wave Astronomy, Michelle B. Larson, Louis J. Rubbo, Kristina D. Zaleski, Shane L. Larson Jan 2006

Science Icebreaker Activities: An Example From Gravitational Wave Astronomy, Michelle B. Larson, Louis J. Rubbo, Kristina D. Zaleski, Shane L. Larson

All Physics Faculty Publications

At the beginning of a class, workshop, or meeting, an icebreaker activity is often used to help loosen up the group and get everyone talking. When used as a precursor to group learning, the icebreaker fosters communication so later activities function more smoothly. Science-based icebreaker activities serve the purpose of a traditional icebreaker, while also introducing science content to the audience. The content of the icebreaker may or may not be related to the topic of the upcoming class or meeting. Either way, the activity provides a way to get people talking while the participants simultaneously learn something new and …

Go to article

Characteristics Of Wave Induced Oscillations In Mesospheric O2 Emission Intensity And Temperature, A. Taori, Michael J. Taylor Jan 2006

Characteristics Of Wave Induced Oscillations In Mesospheric O2 Emission Intensity And Temperature, A. Taori, Michael J. Taylor

All Physics Faculty Publications

Gravity wave and tidal signatures in mesospheric emissions can be characterized using a quantity η which relates the wave intensity perturbations to the corresponding induced temperature oscillation. The quasi-monochromatic wave induced oscillations in the O2 (0–1) atmospheric emission observed from Maui, Hawaii (20.8 N, 156.2 W) have been investigated for the periods ranging from 1–12 hours. Our results clearly show that ∣η∣ increases from 0.5 to 10 with the increasing wave periods while the phase Ø exhibits a decreasing trend (+75 to −100°). When compared with model, observed trends agree well while significant differences in the absolute values are …

Go to article

Design And Construction Of A Misse-6 Payload: State Of Utah Space Environment & Contamination Study (Suspecs), Joshua L. Hodges, Jeff Duce, John R. Dennison Jan 2006

Design And Construction Of A Misse-6 Payload: State Of Utah Space Environment & Contamination Study (Suspecs), Joshua L. Hodges, Jeff Duce, John R. Dennison

All Physics Faculty Publications

No abstract provided.

Go to article

Gravitational Waves: New Observatories For New Astronomy, Louis J. Rubbo, Shane L. Larson, Michelle B. Larson, Kristina D. Zaleski Jan 2006

Gravitational Waves: New Observatories For New Astronomy, Louis J. Rubbo, Shane L. Larson, Michelle B. Larson, Kristina D. Zaleski

All Physics Faculty Publications

This article reviews the current status of gravitational wave astronomy and explains why astronomers are excited about the new generation of gravitational wave detectors. As part of the review we compare and contrast gravitational radiation to the more familiar electromagnetic radiation. We discuss the current indirect experimental evidence for gravitational waves and how current and future gravitational wave detectors will operate as our newest telescopes are pointed at the skies.

Go to article

Integrated Restoration Strategies Towards Weed Control On Western Rangelands, U.S. Forest Service Jan 2006

Integrated Restoration Strategies Towards Weed Control On Western Rangelands, U.S. Forest Service

Wildlife Conservation and Management

An attempt to find native plant materials competitive with cheatgrass to help break the cheatgrass-fire cycle and begin the transition from exotic annual-dominated vegetation to native perennial dominated vegetation.

Go to article

Terpenes And Carbohydrate Source Influence Rumen Fermentation, Digestibility, Intake, And Preference In Sheep, J. J. Villalba, F. D. Provenza, K. C. Olson Jan 2006

Terpenes And Carbohydrate Source Influence Rumen Fermentation, Digestibility, Intake, And Preference In Sheep, J. J. Villalba, F. D. Provenza, K. C. Olson

Green Canyon Environmental Research Area, Logan Utah

We hypothesized that toxins and nutrients in foods interact to influence foraging behavior by herbivores. Based on this hypothesis we predicted that 1) terpenes in big sagebrush (Artemisia tridentata) influence intake and preference in sheep for diets varying in sources of nonstructural (barley grain) and structural (sugar beet pulp) carbohydrates, and 2) these effects are due to the differential effects of terpenes on fermentation products and apparent digestibility of each class of carbohydrates. Lambs were fed 2 isoenergetic and isonitrogenous diets with varying proportions of the same ingredients (beet pulp- and barley grain-based diet) or offered a choice between the …

Go to article

Logic Circuits And The Quality Of Life, Vincent W. Childress Jan 2006

Logic Circuits And The Quality Of Life, Vincent W. Childress

Publications

The article presents information on the relationship between the logic circuits and the quality of life. The applications of logic circuits are countless. With the flooding of New Orleans in the wake of Hurricane Katrina, people around the world became all too aware of human dependency on technology to manage the forces of nature and maintain a high quality of life. New Orleans' sewage and water control systems depend on water pumps to move sewage, storm-water runoff, and fresh water around the city. Under normal conditions, when it rains in New Orleans, a city that sits below sea level, massive …

Go to article

Suspects- State Of Utah Space, Environment & Contamnation Study- Misse Vi, Jeff Ducea, Josh Hodgesa, Jacob Geddesa, Andrew Aumana, Sarah Bartona, Jr Dennison, Clint Thomsonc, J. W. Burnsc, L. Pearsonc, L. Davis, R. S. Hydec, James S. Dyerd Jan 2006

Suspects- State Of Utah Space, Environment & Contamnation Study- Misse Vi, Jeff Ducea, Josh Hodgesa, Jacob Geddesa, Andrew Aumana, Sarah Bartona, Jr Dennison, Clint Thomsonc, J. W. Burnsc, L. Pearsonc, L. Davis, R. S. Hydec, James S. Dyerd

Posters

A Study of the effects of prolonged exposure to the space environment and of charge-enhanced contamination on the electron emission and resistivity of spacecraft materials, the State of Utah Space Environment & Contamination Study (SUSpECTS), is planned for flight aboard the MISSE-6 payload. the Materials International Space month exposure periods on-orbit on the International Space Station, with a target flight date of mid-2006. The study is conducted by the Utah State University Materials that contamination can lead to catastrophic charging effects under certain circumstances, little direct information is presently available on the effects of sample deterioration and on emission properties …

Go to article

Structural Evolution And Vorticity Of Flow During Extrusion And Exhumation Of The Greater Himalayan Slab, Mount Everest Massif, Tibet/Nepal: Implications For Orogen-Scale Flow Partitioning, M. J. Jessup, R. D. Law, M. P. Searle, Mary S. Hubbard Jan 2006

Structural Evolution And Vorticity Of Flow During Extrusion And Exhumation Of The Greater Himalayan Slab, Mount Everest Massif, Tibet/Nepal: Implications For Orogen-Scale Flow Partitioning, M. J. Jessup, R. D. Law, M. P. Searle, Mary S. Hubbard

Geosciences Faculty Publications

The Greater Himalayan Slab (GHS) is composed of a north-dipping anatectic core, bounded above by the South Tibetan detachment system (STDS_ and below by the Main Central thrust zone (MCTZ). Assuming simultaneous movement on the MCTZ and STDS, the GHS can be modelled as a southward-extruding wedge or channel. New insights into extrusion-related flow with the GHS emerge from detailed kinematic and vorticity analyses in the Everest region. At the highest structural levels, mean kinematic vorticity number (Wm) estimates of 0.74-0.91 (c. 45-28% pure shear) were obtained from sheared Tethyan limestone and marble from the Yellow Band on Mount Everest. …

Go to article

First Prev Next Last