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Utah State University

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2002

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Articles 1 - 30 of 44

Full-Text Articles in Physical Sciences and Mathematics

Poiseuille Advection Of Chemical Reaction Fronts: Eikonal Approximation, R. S. Spangler, Boyd F. Edwards, J. Chem Dec 2002

Poiseuille Advection Of Chemical Reaction Fronts: Eikonal Approximation, R. S. Spangler, Boyd F. Edwards, J. Chem

All Physics Faculty Publications

An eikonal equation including fluid advection is derived from the cubic reaction-diffusion-advection equation, and is used to investigate the speeds and shapes of chemical reaction fronts subject to Poiseuille flow between parallel plates. Although the eikonal equation is usually regarded as valid when the front thickness is small compared to the radius of curvature of the front and to the size of the system, it is also found to be valid when the reaction front is thick with respect to the gap width. This new regime of applicability of the eikonal equation is consistent with its derivation, which requires only …

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Influence Of Terrain On Scaling Laws For River Networks, D. A. Vasquez, D. H. Smith, Boyd F. Edwards Nov 2002

Influence Of Terrain On Scaling Laws For River Networks, D. A. Vasquez, D. H. Smith, Boyd F. Edwards

All Physics Faculty Publications

The upper Cheat River network departs from scaling laws describing a large number of river networks in North America. This departure is traced to its corrugated terrain. The more typical random terrain of the lower Cheat River network obeys the standard scaling laws. We modify the random network model of Scheidegger to include the effects of topography, reproducing the behavior observed in the Cheat River basin.

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Statistical Characteristics Ofsprite Halo Events Using Coincident Photometric And Imaging Data, R. Miyasato, Michael J. Taylor, H. Fukunishi, Y. Takahashi, H. Nielsen Nov 2002

Statistical Characteristics Ofsprite Halo Events Using Coincident Photometric And Imaging Data, R. Miyasato, Michael J. Taylor, H. Fukunishi, Y. Takahashi, H. Nielsen

All Physics Faculty Publications

Sprite halos are brief, diffuse flashes, which occur at the top of a sprite and precede the development of streamer structures at lower altitudes. We have investigated the characteristics of sprite halos in detail using coincident photometric and imaging data obtained during the Sprites'96 and '99 campaign in Colorado and Wyoming, USA. It is found that the average altitude of the centroid of the halo emission and the mean horizontal diameter of the halo events are ∼80 and ∼86 km, respectively, while the average speed of the descending motion of the sprite halos was ∼4.3 × 107 m/s. It …

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Femtosecond Pump-Probe Reflectivity Study Of Silicon Carrier Dynamics, A. J. Sabbah, D. Mark Riffe Oct 2002

Femtosecond Pump-Probe Reflectivity Study Of Silicon Carrier Dynamics, A. J. Sabbah, D. Mark Riffe

All Physics Faculty Publications

We have studied the ultrafast optical response of native-oxide terminated Si(001) with pump-probe reflectivity using 800 nm, 28 fs pulses at an excitation density of (5.5±0.3)×1018cm-3. Time-dependent reflectivity changes comprise third-order-response coherent-transient variations arising from anisotropic state filling and linear-response variations arising from excited free carriers, state filling, and lattice heating. A time constant of 32±5fs associated with momentum relaxation is extracted from the coherent-transient variations. The state-filling and free-carrier responses are sensitive to carrier temperature, allowing an electron-phonon energy relaxation time of 260±30fs to be measured. The recovery of the reflectivity signal back towards its …

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3-D Seismic Exploration Project, Ute Indian Tribe, Uintah & Ouray Reservation, Uintah County, Utah, Marc T. Eckels Sep 2002

3-D Seismic Exploration Project, Ute Indian Tribe, Uintah & Ouray Reservation, Uintah County, Utah, Marc T. Eckels

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

No abstract provided.

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Poiseuille Advection Of Chemical Reaction Fronts, Boyd F. Edwards Aug 2002

Poiseuille Advection Of Chemical Reaction Fronts, Boyd F. Edwards

All Physics Faculty Publications

Poiseuille flow between parallel plates alters the shapes and velocities of chemical reaction fronts. In the narrow-gap limit, the cubic reaction-diffusion-advection equation predicts a front-velocity correction equal to the gap-averaged fluid velocity ϵ. In the singular wide-gap limit, the correction equals the midgap fluid velocity 3ϵ/2 when the flow is in the direction of propagation of the reaction front, and equals zero for adverse flow of any amplitude for which the front has a midgap cusp. Stationary fronts are possible only for adverse flow and finite gaps. Experiments are suggested.

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Visual Analysis Special Report Technical Appendix, Operation Of Flaming Gorge Dam Final Environmental Impact Statement, Brent Hanchett Jul 2002

Visual Analysis Special Report Technical Appendix, Operation Of Flaming Gorge Dam Final Environmental Impact Statement, Brent Hanchett

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

This report addresses the scenic resources surrounding Flaming Gorge Reservoir and the Green River Corridor. The focus is on potential visual impacts to changes in shoreline exposure resulting from fluctuating ongoing water levels and downstream water flows. Discussion will include scenic resources on the Flaming Gorge National Recreation Area (NRA) and the Green River Corridor. The U.S. Department of Agriculture Forest Service (USDA Forest Service) and Bureau of Land Management (BLM) have developed systems for the administration of scenic qualities on Federal lands (Scenery Management System, USDA Forest Service, 1995, 1974; Visual Resource System, BLM, 1991). Both agency systems are …

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Public Involvement In National Park Service Land Management Issues, Dr. Jo Ellen Force, Deborah J. Forester, National Park Service, U.S. Department Of The Interior Jul 2002

Public Involvement In National Park Service Land Management Issues, Dr. Jo Ellen Force, Deborah J. Forester, National Park Service, U.S. Department Of The Interior

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

This paper reviews the literature on public involvement in the context of public land management agencies with particular attention to public involvement activities in the National Park Service. A conceptual framework borrowed from small-group decision-making literature is presented to assist public land managers in determining the role and place of public involvement in the management process. A variety of public involvement techniques and data analysis methods is reviewed. A review of the literature suggests several recommendations for managers, including: clarify the goals of public involvement; focus on the public involvement process as well as the outcome; and use a variety …

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Scoping Comment Summary Report For The Vegetation Treatments Programmatic Environmental Impact Statement, United States Department Of The Interior, Bureau Of Land Management Jun 2002

Scoping Comment Summary Report For The Vegetation Treatments Programmatic Environmental Impact Statement, United States Department Of The Interior, Bureau Of Land Management

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

No abstract provided.

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Strategic Management Plan For Columbian Sharp-Tailed Grouse 2002, State Of Utah, Department Of Natural Resoures, Division Of Wildlife Resources Jun 2002

Strategic Management Plan For Columbian Sharp-Tailed Grouse 2002, State Of Utah, Department Of Natural Resoures, Division Of Wildlife Resources

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

The Columbian Sharp-tailed Grouse (Tympanuchus phasianellus columbianus) is one of seven subspecies of Sharp-tailed Grouse. Historically, Columbian Sharp-tailed Grouse occurred within sagebrush-native bunch grass habitat throughout the intermountain region, extending from British Columbia, Washington, Idaho and Montana south through portions of Oregon, California, Nevada, Utah, Wyoming, Colorado and New Mexico. Sharp-tailed Grouse populations range-wide began declining during 1880-1920 (Bart 2000). By 1936, the range of distribution had been reduced by two-thirds (Hart et al. 1950). Currently, Columbian Sharp-tailed Grouse occur in only 5 % of their historic range-wide distribution and 4% of their distribution in Utah (Bart 2000). Within the …

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Hill Air Force Base: Archaeological Monitoring Of Target And Access Road Development For The Ts-5-2 Target Area, Utah Test And Training Range, Tooele County, Utah, Daron Duke Jun 2002

Hill Air Force Base: Archaeological Monitoring Of Target And Access Road Development For The Ts-5-2 Target Area, Utah Test And Training Range, Tooele County, Utah, Daron Duke

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

The U.S. Army Corps of Engineers, Fort Worth District, contracted with Geo-Marine, Inc., to conduct archaeologial monitoring for a U.S. Air Force Air Combat Command (ACC) project on the Utah Test and Training Range (UTTR), which is under the jurisdiction of Hill Air Force Base and located in Tooele County, western Utah. Monitoring of ground disturbing activities associated with ACC development of Target TS-5-2 and a 2.5-mile dirt access road on the TS-5 (Wild Isle) area of UTTR was undertaken in January 2001. Additional target and access road development monitoring was conducted in July and August of 2001, and the …

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Report To Congress: Operations Of Glen Canyon Dan Pursuant To The Grand Canyon Protection Act Of 1992, Water Years 1999-2001, Secretary Of The Interior May 2002

Report To Congress: Operations Of Glen Canyon Dan Pursuant To The Grand Canyon Protection Act Of 1992, Water Years 1999-2001, Secretary Of The Interior

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

Section 1804(c)(2) of the Grand Canyon Protection Act (GCPA) of 1992 requires the Secretary of the Interior (Secretary) to: . . . transmit to the Congress and to the Governors of the Colorado River Basin States a report, separate from and in addition to the report specified in section 602(b) of the Colorado River Basin Project Act of 1968, on the preceding year and the projected year operations undertaken pursuant to this Act. This report responds to the above-cited reporting requirements. The report focuses on Glen Canyon Dam operations for water years 1999 through 2001, projected dam operations for water …

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Visual And Lidar Observations Ofnoctilucent Clouds Above Logan, Utah, At 41.7°N, Vincent B. Wickwar, Michael J. Taylor, Joshua P. Herron, B. A. Martineau Apr 2002

Visual And Lidar Observations Ofnoctilucent Clouds Above Logan, Utah, At 41.7°N, Vincent B. Wickwar, Michael J. Taylor, Joshua P. Herron, B. A. Martineau

All Physics Faculty Publications

Noctilucent clouds (NLCs) were observed from a midlatitude site (Logan, Utah) on the evenings of 22 and 23 June 1999 mountain daylight time. On both nights the clouds were seen for approximately an hour by experienced observers, and they were photographed. The NLC was also observed on the second evening for approximately an hour in the zenith with the Rayleigh-scatter lidar at the Atmospheric Lidar Observatory, which is operated by the Center for Atmospheric and Space Sciences on the campus of Utah State University. These observations enabled several of the properties of the cloud to be determined. They were within …

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River Meandering Dynamics, Boyd F. Edwards, D. H. Smith Mar 2002

River Meandering Dynamics, Boyd F. Edwards, D. H. Smith

All Physics Faculty Publications

The Ikeda, Parker, and Sawai river meandering model is reexamined using a physical approach employing an explicit equation of motion. For periodic river shapes as seen from above, a cross-stream surface elevation gradient creates a velocity shear that is responsible for the decay of small-wavelength meander bends, whereas secondary currents in the plane perpendicular to the downstream direction are responsible for the growth of large-wavelength bends. A decay length D=H/2Cf involving the river depth H and the friction coefficient Cf sets the scale for meandering, giving the downstream distance required for the fluid velocity profile to recover from …

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Comparative Analysis Of Pollution In Farmington Bay And The Great Salt Lake, Utah, Wayne A. Wurtsbaugh, Amy M. Marcarelli, Cameron Christison, Joel Moore, Donovan Gross, Sophia Bates, Sara Kircher Feb 2002

Comparative Analysis Of Pollution In Farmington Bay And The Great Salt Lake, Utah, Wayne A. Wurtsbaugh, Amy M. Marcarelli, Cameron Christison, Joel Moore, Donovan Gross, Sophia Bates, Sara Kircher

Watershed Sciences Faculty Publications

Farmington Bay covers 94 mi2 (260 km2) in the SW comer of the Great Salt Lake, and is essentially a separate lake because it is enclosed by Antelope Island and a causeway leading to the island from the mainland. The bay has received wastes from the adjoining Salt Lake City metropolitan area for decades. Because of water quality concerns for Farmington 8ay, the Aquatic Ecology Laboratory class at Utah State University studied the bay and a nearby control site (Bridger Bay) in the Great Salt Lake during the fall of 2001. Field sampling and laboratory experiments, as well as other …

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Development And Validation Of Spatially Explicit Habitat Models For Cavity-Nesting Birds In Fishlake National Forest, Utah, Randall J. Schultz, Jr., Thomas C. Edwards, Jr., Gretchen G. Molsen, Tracey S. Frescino Jan 2002

Development And Validation Of Spatially Explicit Habitat Models For Cavity-Nesting Birds In Fishlake National Forest, Utah, Randall J. Schultz, Jr., Thomas C. Edwards, Jr., Gretchen G. Molsen, Tracey S. Frescino

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

The ability of USDA Forest Service Forest Inventory and analysis (FIA) generated spatial products to increase the predictive accuracy of spatially explicit, macroscale habitat models was examined for nest-site selection by cavity-nesting birds in Fishlake National Forest, Utah. One FIA-derived variable (percent basal area of aspen trees) was significant in the habitat model; however, the incorporation of FIA stand structure information did not increase model accuracy. Cavity-nesting birds respond strongly to nest-tree attributes unable to be modeled spatially for this study. Future modeling efforts should focus on larger taxa (e.g., ungulates) and richness/diversity studies.

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Flood Insurance Study, Salt Lake County, Utah, And Incorporated Areas, Volume 3 Of 3, Federal Emergency Management Agency Jan 2002

Flood Insurance Study, Salt Lake County, Utah, And Incorporated Areas, Volume 3 Of 3, Federal Emergency Management Agency

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

Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study may not contain all data available within the repository. It is advisable to contact the community repository for any additional data.

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Final General Management Plan/Environmental Impact Statement (Visitor Management And Resource Protection Plan) Zion National Park, Utah, U.S. Department Of The Interior, National Park Service Jan 2002

Final General Management Plan/Environmental Impact Statement (Visitor Management And Resource Protection Plan) Zion National Park, Utah, U.S. Department Of The Interior, National Park Service

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

The purpose of this conceptual plan is to describe the general path the National Park Service intends to follow in managing Zion National Park over the next 20 years. The approved plan will provide a framework for proactive decision making on such issues as visitor use, natural and cultural resource management, and park development, which will allow park managers to effectively address future problems and opportunities. In most cases, new development outside the park would take place to meet visitor needs.

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Final Environmental Impact Statement C.J. Strike Project Idaho, Ferc Project No. 2055, United States Department Of Energy, Federal Energy Regulatory Commission Jan 2002

Final Environmental Impact Statement C.J. Strike Project Idaho, Ferc Project No. 2055, United States Department Of Energy, Federal Energy Regulatory Commission

Final Environmental Impact Statements (ID)

Idaho Power Company (Idaho Power) filed an application for a new license for the existing C.J. Strike Project located on the Snake River and Bruneau River in Owyhee and Elmore Counties, Idaho, between the towns of Grandview and Bruneau. A major issue in this relicensing proceeding is how project-induced water-level fluctuations from load following operations affect aquatic and terrestrial resources. The final environmental impact statement (final EIS) presents the staff's evaluation of the developmental and nondevelopmental consequences of Idaho Power's Proposal and three alternatives: the No-action Alternative, the Idaho Power Proposal with Modifications, and the Run-of River Alternative. We make …

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Electronic Structure And Bonding In Metal Porphyrins, Metal=Fe, Co, Ni, Cu, Zn, M.-S. Liao, Steve Scheiner Jan 2002

Electronic Structure And Bonding In Metal Porphyrins, Metal=Fe, Co, Ni, Cu, Zn, M.-S. Liao, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

A systematic theoretical study of the electronic structure and bonding in metal meso-tetraphenyl porphines MTPP, M=Fe, Co, Ni, Cu, Zn has been carried out using a density functional theory method. The calculations provide a clear elucidation of the ground states for the MTPPs and for a series of [MTPP]x ions (x = 2+, 1+, 1−, 2−, 3−, 4−), which aids in understanding a number of observed electronic properties. The calculation supports the experimental assignment of unligated FeTPP as 3A2g, which arises from the configuration (dxy)2(dz …

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Dextral Shear Along The Eastern Margin Of The Colorado Plateau- A Kinematic Link Between Laramide Contraction And Rio Grande Rifting (Ca 75 Ma To 13 Ma), T. F. Wawrzyniec, J. W. Geissman, M. D. Melker, Mary S. Hubbard Jan 2002

Dextral Shear Along The Eastern Margin Of The Colorado Plateau- A Kinematic Link Between Laramide Contraction And Rio Grande Rifting (Ca 75 Ma To 13 Ma), T. F. Wawrzyniec, J. W. Geissman, M. D. Melker, Mary S. Hubbard

Geosciences Faculty Publications

Kinematic data associated with both Laramide‐age and ‐style and Rio Grande rift‐related structures show that the latest Cretaceous to Neogene interaction between the Colorado Plateau and the North American craton was dominantly coupled with a component of dextral shear. Consistent with earlier studies, minor‐fault data in this study yielded results of varied kinematics. Inverted to a common northeast‐oriented hemisphere, the mean trend of kinematic shortening associated with Laramide‐age structures is 056∘±6" role="presentation" style="box-sizing: border-box; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px …

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Transverse Group Actions On Bundles, Ian M. Anderson, Mark E. Fels Jan 2002

Transverse Group Actions On Bundles, Ian M. Anderson, Mark E. Fels

Mathematics and Statistics Faculty Publications

An action of a Lie group G on a bundle is said to be transverse if it is projectable and if the orbits of G on E are diffeomorphic under π to the orbits of G on M. Transverse group actions on bundles are completely classified in terms of the pullback bundle construction for G-invariant maps. This classification result is used to give a full characterization of the G invariant sections of E for projectable group actions.

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Biological Soil Crusts : Webs Of Life In The Desert, Jayne Belnap Jan 2002

Biological Soil Crusts : Webs Of Life In The Desert, Jayne Belnap

Canyonlands Research Bibliography

No abstract provided.

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Temporal Variation In Community Composition, Pigmentation, And Fv/Fm Of Desert Cyanobacterial Soil Crusts, M. A. Bowker, S. C. Reed, J. Belnap, S. L. Phillips Jan 2002

Temporal Variation In Community Composition, Pigmentation, And Fv/Fm Of Desert Cyanobacterial Soil Crusts, M. A. Bowker, S. C. Reed, J. Belnap, S. L. Phillips

Canyonlands Research Bibliography

Summers on the Colorado Plateau (USA) are typified by harsh conditions such as high temperatures, brief soil hydration periods, and high UV and visible radiation. We investigated whether community composition, physiological status, and pigmentation might vary in biological soil crusts as a result of such conditions. Representative surface cores were sampled at the ENE, WSW, and top microaspects of 20 individual soil crust pedicels at a single site in Canyonlands National Park, Utah, in spring and fall of 1999. Frequency of cyanobacterial taxa, pigment concentrations, and dark adapted quantum yield (Fv/Fm) were measured for each core. The frequency of major …

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Electronic Structure And Bonding In Unligated And Ligated Feii Porphyrins, M.-S. Liao, Steve Scheiner Jan 2002

Electronic Structure And Bonding In Unligated And Ligated Feii Porphyrins, M.-S. Liao, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

The electronic structure and bonding in a series of unligated and ligated FeII porphyrins (FeP) are investigated by density functional theory (DFT). All the unligated four-coordinate iron porphyrins have a 3A2g ground state that arises from the (dxy)2(dz2)2(dπ)2 configuration. The calculations confirm experimental results on Fe tetraphenylporphine but do not support the resonance Raman assignment of Fe octaethylporphine as 3Eg, nor the early assignment of Fe octamethyltetrabenzporphine as 5B2g. For the six-coordinate Fe–P( …

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Topo-Morphometric Analysis Of Lake-Stream Interactions In Alpine Watersheds, Wayne A. Wurtsbaugh, Michelle A. Baker Jan 2002

Topo-Morphometric Analysis Of Lake-Stream Interactions In Alpine Watersheds, Wayne A. Wurtsbaugh, Michelle A. Baker

Watershed Sciences Faculty Publications

No abstract provided.

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Variation In Overstory Nitrogen Uptake In A Small, High-Elevation Southern Appalachian Spruce-Fir Watershed, M. Barker, H. Van Miegroet, N. S. Nicholas, I. F. Creed Jan 2002

Variation In Overstory Nitrogen Uptake In A Small, High-Elevation Southern Appalachian Spruce-Fir Watershed, M. Barker, H. Van Miegroet, N. S. Nicholas, I. F. Creed

Watershed Sciences Faculty Publications

High-elevation red spruce (Picea rubens Sarg.) – Fraser fir (Abies fraseri (Pursh) Poir.) forests of the southern Appalachians exhibit considerable spatial heterogeneity in structure, and possibly in N uptake, because of a combination of natural disturbances and heavy fir mortality caused by infestations of the exotic balsam woolly adelgid (Adelges piceae Ratz). The objectives of this study are to determine spatial variability in tree N uptake in a small high-elevation catchment in the Great Smoky Mountains National Park, compare outcomes among calculation methods, and assess the influence of stand and landscape properties on N uptake. Tree N uptake is estimated …

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The Roswell And Carlsbad Bureau Of Land Management Field Offices And Lincoln National Forest Endangered, Threatened And Sensitive Plant Field Guide, United States Bureau Of Land Management Jan 2002

The Roswell And Carlsbad Bureau Of Land Management Field Offices And Lincoln National Forest Endangered, Threatened And Sensitive Plant Field Guide, United States Bureau Of Land Management

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

This field guide has been prepared through a combined effort of the Roswell and Carlsbad Field Offices of the Bureau of Land Management (BLM), the Lincoln National Forest (LNF), and Ecosphere Environmental Services. This guide will help agency field personnel and public land users identify special status species found in the Roswell, Carlsbad, and Lincoln National Forest management areas.

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High Plains To Rio Grand Rift: Late Cenozoic Evolution Of Central Colorado, E. M. Leonard, Mary S. Hubbard, S. A. Kelley, E. Evanoff, C. S. Siddoway, C. G. Oviatt, M. Heizler, M. Timmons Jan 2002

High Plains To Rio Grand Rift: Late Cenozoic Evolution Of Central Colorado, E. M. Leonard, Mary S. Hubbard, S. A. Kelley, E. Evanoff, C. S. Siddoway, C. G. Oviatt, M. Heizler, M. Timmons

Geosciences Faculty Publications

No abstract provided.

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Water Conservation In The Home, Nancy Mesner Jan 2002

Water Conservation In The Home, Nancy Mesner

All Archived Publications

No abstract provided.

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