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

Digital Commons Network™

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

Utah State University

2006

Discipline
Keyword
Publication
Publication Type
File Type

Articles 631 - 642 of 642

Full-Text Articles in Entire DC Network

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

Stewardship And The Concept Of Yield In Landscape Water Conservation, Larry A. Rupp, Roger Kjelgren Jan 2006

Stewardship And The Concept Of Yield In Landscape Water Conservation, Larry A. Rupp, Roger Kjelgren

Plants, Soils, and Climate Faculty Publications

Growing up in what was rural Salt Lake County, my peers and I never knew a time when questions of water did not flow through our lives as surely as it flowed through the canals and irrigation ditches. We played in the flood of water pumped from the ditch onto our lawn, and we floated homemade rafts down the canal in the heat of the summer. We listened in amazement to descriptions of how the canals were built and wondered when we would be big enough to be asked to join the cooperative crew that skimmed the ditches in 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

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

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

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

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

Faculty Senate Membership Roster 2006, Utah State University Jan 2006

Faculty Senate Membership Roster 2006, Utah State University

Faculty Senate & Faculty Senate Executive Committee

List of past membership for Faculty Senate including members, substitutes, and presidentially appointed members; names, emails, the year for end of term, college, UMC, and phone number are recorded.

Go to article

Perceptions Of The Value Of Problem-Based Learning Among Students With Special Needs And Their Teachers, Brian Robert Belland, P. A. Ertmer, K. D. Simons Jan 2006

Perceptions Of The Value Of Problem-Based Learning Among Students With Special Needs And Their Teachers, Brian Robert Belland, P. A. Ertmer, K. D. Simons

Instructional Technology and Learning Sciences Faculty Publications

While problem-based learning (PBL) has been found to be effective with gifted and average students (Hmelo-Silver, 2004), little is known about its impact on students with special needs. This study examines the perceptions of middle-school students with mild, moderate, and severe disabilities and of their teachers regarding the value of participating in a PBL unit. The unit focused on the physical accessibility of a low-SES, rural community where the students’ school was located.We used the constant comparative method (Glaser & Strauss, 1967) to analyze interview data, and used observation data and artifacts to triangulate interview comments. Among the noteworthy findings …

Go to article

A Design-Based Research Strategy To Promote Scalability For Educational Innovations, Jody Clarke-Midura, C. Dede, D. J. Ketelhut, B. Nelson, C. Bowman Jan 2006

A Design-Based Research Strategy To Promote Scalability For Educational Innovations, Jody Clarke-Midura, C. Dede, D. J. Ketelhut, B. Nelson, C. Bowman

Instructional Technology and Learning Sciences Faculty Publications

This article offers insights into how the design of innovations can enhance their “scalability”: the ability to adapt an innovation to effective usage in a wide variety of contexts, including settings where major conditions for success are absent or attenuated. We are implementing the River City MUVE curriculum, a technology-based innovation designed to enhance engagement and learning in middle school science, in a range of educational contexts. Based on our studies of these scaling up activities, we offer examples of design strategies for scalability and describe our plan to develop a “scalability index.”

Go to article

Use Of Predictive Models To Attribute Potential Effects Of Mixture Toxicity And Habitat Alteration On The Biological Condition Of Fish Assemblages, D. De Zwart, S. D. Dyer, L. Posthuma, Charles P. Hawkins Jan 2006

Use Of Predictive Models To Attribute Potential Effects Of Mixture Toxicity And Habitat Alteration On The Biological Condition Of Fish Assemblages, D. De Zwart, S. D. Dyer, L. Posthuma, Charles P. Hawkins

Watershed Sciences Faculty Publications

No abstract provided.

Go to article

Greater Sage-Grouse Ecology In Western Box Elder County, Utah 2005 Annual Report, Jan S. Knerr, Terry A. Messmer Jan 2006

Greater Sage-Grouse Ecology In Western Box Elder County, Utah 2005 Annual Report, Jan S. Knerr, Terry A. Messmer

All Current Publications

No abstract provided.

Go to article

First Prev