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Articles 4321 - 4350 of 7344

Full-Text Articles in Physical Sciences and Mathematics

The Conductor-Dielectric Junctions In A Low Density Plasma, B. V. Vayner, J. T. Galofaro, D. C. Ferguson, Win De Groot, Clint Thomson, John R. Dennison, Robert Davies Jan 1999

The Conductor-Dielectric Junctions In A Low Density Plasma, B. V. Vayner, J. T. Galofaro, D. C. Ferguson, Win De Groot, Clint Thomson, John R. Dennison, Robert Davies

All Physics Faculty Publications

A conductor-dielectric junction exposed to the space environment is a frequent spacecraft design feature. Due to spacecraft charging and/or solar array operation, the conductor can acquire a high potential with respect to the surrounding plasma. If this potential is positive the insulators adjacent to exposed conductors can collect current as if they were conductors themselves. This phenomenon, called snapover, results in a substantial increase in current collection, and may even result in a glow discharge if the potential is high enough. If a conductor has a negative potential, arcing can occur at the site of a junction. Both of these …

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Constructing A Portable Sundial, Michelle B. Larson Jan 1999

Constructing A Portable Sundial, Michelle B. Larson

All Physics Faculty Publications

Throughout history people have used shadows and sundials to measure the passage of time. This article describes how to construct a personal sundial that can be worn as a necklace or carried as a key chain. The activity is easily adaptable for grade levels elementary through high school. The instructions can be scaled for a schoolyard project. We’ve found sundial construction to be a terrific project that not only encourages students to investigate movement of the Sun in the sky, but also allows them to practice their math skills.

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Effects Of Magnetospheric Precipitation And Ionospheric Conductivity On The Ground Magnetic Signatures Of Traveling Convection Vortices, Lie Zhu, Robert W. Schunk, Jan Josef Sojka Jan 1999

Effects Of Magnetospheric Precipitation And Ionospheric Conductivity On The Ground Magnetic Signatures Of Traveling Convection Vortices, Lie Zhu, Robert W. Schunk, Jan Josef Sojka

All Physics Faculty Publications

By using an improved TCV model (Zhu et al., 1997), a quantitative study of the effects of magnetospheric precipitation and ionospheric background conductivity on the ground magnetic signatures of traveling convection vortices (TCVs) has been conducted. In this study the localized conductivity enhancement associated with the TCVs is present and the ratio of the Hall and Pedersen conductances vary both spatially and temporally according to the hardness of the TCV precipitation. It is found that a strong conductivity enhancement associated with hard TCV precipitation can significantly distort the TCV current closure in the ionosphere and lead to ground magnetic disturbance …

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Functional Evolution Of Free Quantum Fields, Charles G. Torre, Madhavan Varadarajan Jan 1999

Functional Evolution Of Free Quantum Fields, Charles G. Torre, Madhavan Varadarajan

All Physics Faculty Publications

We consider the problem of evolving a quantum field between any two (in general, curved) Cauchy surfaces. Classically, this dynamical evolution is represented by a canonical transformation on the phase space for the field theory. We show that this canonical transformation cannot, in general, be unitarily implemented on the Fock space for free quantum fields on flat spacetimes of dimension greater than 2. We do this by considering time evolution of a free Klein-Gordon field on a flat spacetime (with toroidal Cauchy surfaces) starting from a flat initial surface and ending on a generic final surface. The associated Bogolubov transformation …

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Effects Of Spacecraft Potential On Secondary Electron Yields In Geosynchronous Orbit, Neal E. Nickles Jan 1999

Effects Of Spacecraft Potential On Secondary Electron Yields In Geosynchronous Orbit, Neal E. Nickles

All Physics Faculty Publications

Surface charging due to interactions with the earth=s plasma is a hazard for orbiting spacecraft. Secondary electron (SE) emission is an important physical process in spacecraft charging. Current spacecraft charging models do not consider the SE energy or angular distributions and their implications for estimating the return of SE to the spacecraft. Comprehensive work on the application of SE energy and angular distributions to spacecraft charging has been published [Nickles et al., 1999] and part of that work is summarized here. The application of SE energy distributions to the case of positive charging in geosynchronous orbit is discussed and shown …

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Geology Of The Oquirrh Mountains, Utah, United States Geological Survey Jan 1999

Geology Of The Oquirrh Mountains, Utah, United States Geological Survey

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

The Oquirrh Mountains are located in north-central Utah, immediately south of the Great Salt Lake, in the easternmost part of the Basin and Range physiographic province. The range consists of northerly-trending aligned peaks 56 kilometers long flanked on the west by Tooele and Rush Valleys and on the east by Jordan and Cedar Valleys. The range hosts several of the more prominent base- and precious-metal and desseminated-gold mining areas in the western United States. The 130-year old Bingham porphyry copper mining district, which is of world-class magnitude in the central part of the range, is still active. The Mercur mining …

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Preliminary Analysis Of The Management Situation, Land And Resource Management Plan Revision, United States Department Of Agriculture, Forest Service Jan 1999

Preliminary Analysis Of The Management Situation, Land And Resource Management Plan Revision, United States Department Of Agriculture, Forest Service

Natural Resources-Planning, Management, and Conservation

The Uinta Forest Plan (officially entitled Land and Resource Management Plan of the Uinta National Forest) is the document that establishes general management direction for lands administered by the Uinta National Forest. Using broad language, the Forest Plan determines the availability of land for resource management, predicts levels of resource use and outputs, and provides for a variety of resource management practices. The Uinta National Forest completed its current Forest Plan in October, 1984.

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Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, Vol. 3, U.S. Bureau Of Land Management Jan 1999

Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, Vol. 3, U.S. Bureau Of Land Management

Final Environmental Impact Statements (ID)

Five alternatives are described and analyzed in the final Environmental Impact Statement. Alternative A is a continuation of current management. Alternative B was developed through BLM staff interpretation and analysis of information submitted by the Owyhee Country Commissioners with the assistance of the Owyhee County Natural Resources Committee. Alternative C was developed by the BLM lower Snake River District interdisciplinary planning team. Alternative D was developed through BLM staff interpretation and analysis of information submitted by the Desert Group. Alternative E is the agency preferred alternative. It was developed by the BLM Lower Snake River Distrct interdisciplinary planning team.

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Sloan-Kennally Timber Sale Final Environmental Impact Statement, United States Forest Service Jan 1999

Sloan-Kennally Timber Sale Final Environmental Impact Statement, United States Forest Service

Final Environmental Impact Statements (ID)

This Final EIS documents three alternatives analyzed for the Sloan-Kennally Timber Sale. The sale is to be offered in 2000 and administered by the McCall Ranger District of the Payette National Forest. The Sloan-Kennally sale planning area is located approximately 15 miles southeast of McCall. Alternatives include No Action, the Proposed Action, and Alternative 3, no timber harvest in the roadless area. The preferred alternative is the proposed action, which would harvest timber on 571 acres using tractor and helicopter logging systems. The mixture of silvicultural treatments is designed to mimic historic timber stand structure consisting of scattered large trees …

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Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, Volume 2, U. S. Bureau Of Land Management Jan 1999

Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, Volume 2, U. S. Bureau Of Land Management

Final Environmental Impact Statements (ID)

Five alternatives are described and analyzed in the final Environmental Impact Statement. Alternative A is a continuation of current management. Alternative B was developed through BLM staff interpretation and analysis of information submitted by the Owyhee Country Commissioners with the assistance of the Owyhee County Natural Resources Committee. Alternative C was developed by the BLM lower Snake River District interdisciplinary planning team. Alternative D was developed through BLM staff interpretation and analysis of information submitted by the Desert Group. Alternative E is the agency preferred alternative. It was developed by the BLM Lower Snake River Distrct interdisciplinary planning team.

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Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, U.S. Bureau Of Land Management Jan 1999

Proposed Owyhee Resource Management Plan And Final Environmental Impact Statement, U.S. Bureau Of Land Management

Final Environmental Impact Statements (ID)

Five alternatives are described and analyzed i9n the final Environmental Impact Statement. Alternative A is a continuation of current management. Alternative B was developed through BLM staff interpretation and analysis of information submitted by the Owyhee Country Commissioners with the assistance of the Owyhee County Natural Resources Committee. Alternative C was developed by the BLM lower Snake River District interdisciplinary planning team. Alternative D was developed through BLM staff interpretation and analysis of information submitted by the Desert Group. Alternative E is the agency preferred alternative. It was developed by the BLM Lower Snake River Distrct interdisciplinary planning team.

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A Synthesis Of Archaeological Studies On The Utah Test And Training Range, U.S. Air Force Jan 1999

A Synthesis Of Archaeological Studies On The Utah Test And Training Range, U.S. Air Force

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

This report, conducted by Statistical Research, Inc., under contract with the National Park Service, is a synthesis of research to date on the prehistoric and historical archaeology of the Utah Testing and Training Range, two U.S. Air Force training ranges under the jurisdiction of Hill Air Force Base. Results are presented in eight chapters. Topics include present and past environments, paleontological resources, a cultural-historical overview, previous research in the project area (including information on all archaeological resources known as of October 1998), and Native American concerns. This synthesis is used as the backdrop for a brief research design for both …

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Environmental Assessment For Wild Horse Gathering Outside Wild Horse Herd Management Areas, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Environmental Assessment For Wild Horse Gathering Outside Wild Horse Herd Management Areas, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (WY)

The Bureau of Land Management is responsible for the welfare of wild horses. The wild horse program is under constant scrutiny by the public for actions concerning wild horse management and gathering. Within the Rawlins field office (RFO) there is a substantial acreage of "checkerboard" lands. Approximately 50 percent of these lands are BLM-administered public lands and 50 percent are private lands controlled by many private entities. The northern portition of the gather area contains this type of land pattern.

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Management Alternatives And Environmental Assessment, Mormon Row Historic District Grand Teton National Park, Wyoming, United States, Department Of The Interior, National Park Service Jan 1999

Management Alternatives And Environmental Assessment, Mormon Row Historic District Grand Teton National Park, Wyoming, United States, Department Of The Interior, National Park Service

Environmental Assessments (WY)

Few people visiting Mormon Row today realize that the six remaining homesteads constitute about a fifth of those that once defined the Mormon Row community. Time and the harsh climate have taken an extreme toll. Most structures that remain stand abandoned and in need of repair. The farms are not interpreted and most visitors probably do not even know that the historic area is within the boundaries of Grand Teton National Park. Nevertheless, the area receives a light but steady amount of visitation. Visitors remark about inadequate parking, lack of interpretation, the deteriorated condition of many of the historic structures, …

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Environmental Assessment For Wild Horse Gathering Inside And Outside Wild Horse Herd Management Areas, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Environmental Assessment For Wild Horse Gathering Inside And Outside Wild Horse Herd Management Areas, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (WY)

Enclosed you will find the Environmental Assessment (EA) which describes the impacts of gathering wild horses in the Rock Springs Field Office area. Gathering wild horses would take place in the Great Divide Basin, White Mountain, Little Colorado, and Salt Wells Creek Wild Horse Herd Management Areas (HMA) and in an area known as the North Baxter/Jack Morrow area (outside the HMAs).

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Management For The Red Gulch Dinosaur Tracksite Big Horn County, Wyoming, Environmental Assessment, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Management For The Red Gulch Dinosaur Tracksite Big Horn County, Wyoming, Environmental Assessment, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (WY)

A review of existing land-use planning decisions is being conducted to evaluate how to best manage public lands, resources, educational opportunities, and other values associated with the recent discovery of dinosaur tracks on BLM-administered public lands near Shell, Wyoming. The tracks were not addressed in the Washakie Resource Management Plan (RMP) which was completed in 1988. A review of BLM's planning decisions for the discovery area is needed to evaluate the adequacy of existing management prescriptions for the protection of the tracks and related values.

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Decision Record For The Designation Of The Continental Divide National Scenic Trail, United States, Department Of The Interior, Bureau Of Land Management Jan 1999

Decision Record For The Designation Of The Continental Divide National Scenic Trail, United States, Department Of The Interior, Bureau Of Land Management

Record of Decisions (WY)

Based on the analysis of potential environmental impacts contained in the Environmental Assessment for the Designation of the Continental Divide National Scenic Trail, WY-050-EA9-008, dated 1/25/99, we have determined that impacts are not expected to be significant and an environmental impact statement is not required. The decisions contained in this document are in compliance with the applicable land use plans covering the BLM-administered public lands to be designated as the Continental Divide National Scenic Trail (Great Divide, Lander, and Green River Resource Management Plans).

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Final Carbon Basin Coal Project Environmental Impact Statement, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Final Carbon Basin Coal Project Environmental Impact Statement, United States Department Of The Interior, Bureau Of Land Management

Final Environmental Impact Statements (WY)

The Draft and Final Environmental Impact Statements (DEIS and FEIS) assess the environmental consequences of a proposed coal lease sale and subsequent mine development and operation in the Carbon Basin, 11 miles southeast of Hanna, Wyoming. This abbreviated FEIS revises and supplements the DEIS for the Carbon Basin Coal project (DES-98-32) and addresses comments and concerns expressed during the public comment period for the DEIS. The DEIS was made available to the U.S. Environmental Protection Agency (EPA) and the public on August 7, 1998, and a Notice of Availability was published in the Federal Register on the same date. One …

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Final Environmental Impact Statement And Proposed Resource Management Plan For Public Lands Administered By The Bureau Of Land Management Newcastle Field Office, Newcastle, Wyoming, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Final Environmental Impact Statement And Proposed Resource Management Plan For Public Lands Administered By The Bureau Of Land Management Newcastle Field Office, Newcastle, Wyoming, United States Department Of The Interior, Bureau Of Land Management

Final Environmental Impact Statements (WY)

Enclosed is the Final Environmental Impact Statement (EIS) and Proposed Resource Management Plan (RMP) for Public Lands Administered by the Bureau of Land Management (BLM), Newcastle Field Office. This document presents the Proposed RMP for managing the public lands and resources in the Newcastle area. The proposed RMP is a refinement of the preferred alternative presented in the draft EIS published in March 1998.

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Final Environmental Impact Statement Continental Divide/Wamsutter Ii Natural Gas Project, Sweetwater And Carbon Counties, Wyoming, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Final Environmental Impact Statement Continental Divide/Wamsutter Ii Natural Gas Project, Sweetwater And Carbon Counties, Wyoming, United States Department Of The Interior, Bureau Of Land Management

Final Environmental Impact Statements (WY)

This Final Environmental Impact Statement (FEIS) assesses the environmental consequences of a proposed natural gas development project in eastern Sweetwater and southwestern Carbon Counties, Wyoming. This FEIS incorporates by reference most of the material presented in the Draft Environmental Impact Statement (DEIS) for the Continental Divide/Wamsutter II Natural Gas Project and is designed to be used with the DEIS.

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Record Of Decision Carbon Basin Coal Project, United States Department Of Interior Bureau Of Land Management Jan 1999

Record Of Decision Carbon Basin Coal Project, United States Department Of Interior Bureau Of Land Management

Record of Decisions (WY)

The Final Environmental Impact Statement (FEIS) for the Carbon Basin Coal Project was released to the public on January 8, 1999. This document considered and evaluated the impacts of issuing the proposed Elk Mountain/Saddleback Hills competitive coal lease (WYW139975) under the provisions of 43 CFR 3425.1, as a lease by application (LBA). The area proposed for mining is a mixture of private, state, and federal surface and coal estates. If the applicant, Ark Land Company, is the successful bidder, they propose to mine surface and underground federal coal reserves along with their privately-owned coal to make an efficient and economical …

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Acetate Retention And Metabolism In Thehyporheic Zone Of A Mountain Stream, Michelle A. Baker Jan 1999

Acetate Retention And Metabolism In Thehyporheic Zone Of A Mountain Stream, Michelle A. Baker

Michelle A. Baker

An in situ acetate injection was used to determine the influence of labile dissolved organic carbon (DOC) availability on microbial respiration in the hyporheic zone of a headwater stream. We added bromide as a conservative tracer and acetate as an organic substrate to the hyporheic zone of Rio Calaveras, New Mexico, via an injection well. Tracer was observed in four of eight capture wells. Three of the four wells showed increases in bromide without concurrent increases in acetate concentration, suggesting 100% acetate retention. One well had 38% acetate retention. Pore velocity and acetate retention were negatively correlated, suggesting hydrologic control …

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Stratigraphy And Tectonics Of Tertiary Strata Of Southern Cache Valley, R. Q. Oaks Jr., K. A. Smith, Susanne U. Janecke, M. E. Perkins, W. P. Nash Jan 1999

Stratigraphy And Tectonics Of Tertiary Strata Of Southern Cache Valley, R. Q. Oaks Jr., K. A. Smith, Susanne U. Janecke, M. E. Perkins, W. P. Nash

Susanne U. Janecke

No abstract provided.

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Comparison Of Methods For Calculating The Properties Of Intramolecular Hydrogen Bonds. Excited State Proton Transfer, T. Kar, Steve Scheiner, M. Cuma Jan 1999

Comparison Of Methods For Calculating The Properties Of Intramolecular Hydrogen Bonds. Excited State Proton Transfer, T. Kar, Steve Scheiner, M. Cuma

Steve Scheiner

A series of molecules related to malonaldehyde, containing an intramolecular H-bond, are used as the testbed for a variety of levels of ab initio calculation. Of particular interest are the excitation energies of the first set of valence excited states, nπ∗ and ππ∗, both singlet and triplet, as well as the energetics of proton transfer in each state. Taking coupled cluster results as a point of reference, configuration interaction-singles–second-order Møller–Plesset (CIS–MP2) excitation energies are too large, as are CIS to a lesser extent, although these approaches successfully reproduce the order of the various states. The …

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Water Resources Management Plan: Arches National Park & Canyonlands National Park, Utah, Lynn Cudlip, Kevin Berghoff, David Vana-Miller Jan 1999

Water Resources Management Plan: Arches National Park & Canyonlands National Park, Utah, Lynn Cudlip, Kevin Berghoff, David Vana-Miller

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

The National Park Service recognizes the importance of preserving, conserving, and protecting water resources within its boundaries. Water resources, whether as large as the Colorado River or as small as a seep in Ernie's Country of Canyonlands National Park, play a distinctive role in linking ecosystems and , in general, provide habitat for a number of organisms. To protect park water resources, the Natinoal Park Service initiated a Water REsources Planning Program in 1991. The planning program provides an essential step in developing a comprehensive understanding of a park's hydrological system and the complex resource issues which surround it. The …

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A Case For Site Acclimation In The Reintroduction Of The Endangered Razorback Sucker (Xyrauchen Texanus), United States Geological Survey Jan 1999

A Case For Site Acclimation In The Reintroduction Of The Endangered Razorback Sucker (Xyrauchen Texanus), United States Geological Survey

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

Two site-acclimation studies (Mueller and Marsh 1998, Foster and Mueller 1999) were conducted in 1997 and 1998. The primary emphasis was habitat use and dispersal but we also examined if the rapid dispersal, typically associated with hatchery-produced razorback suckers (suckers), could be mitigated by allowing fish a period of time to recover from stocking-induced stress. Findings of those studies and existing physiological literature suggest that current stocking protocols may subject stocked fish to unnecessary behavioral or physiological stress that could impact performance and ultimately survival. This report presents those findings and recommends an evaluation of existing stocking procedures for the …

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Description Of The Pelagic Zooplankton And Fish Communities Of Lakes Powell And Mead, United States Geological Survey Jan 1999

Description Of The Pelagic Zooplankton And Fish Communities Of Lakes Powell And Mead, United States Geological Survey

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

Fishery biologists from Arizona, Nevada, and Utah have been faced with the imposing dilemma of monitoring the pelagic fishery of Lakes Powell and Mead. Standard sampling procedures typically used to monitor shoreline fisheries are simply inadequate for the deep volumes of pelagic habitat found in these two reservoirs. Nearly a decade ago, Arizona and Nevada biologists recommended that hydroacoustics be used to monitor these communities (Persons and Dreyer 1987a,b, NDOW 1994). However, for various reasons an acoustical monitoring program was never fully implemented. This study represents the first attempt to describe the pelagic fishery of either reservoir using acoustic technology.

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The Effect Of Mechanical Noise And Natural Sound On Visitor Experiences In Units Of The National Park System, Dr. James Gramann, National Park Service, U.S. Department Of The Interior Jan 1999

The Effect Of Mechanical Noise And Natural Sound On Visitor Experiences In Units Of The National Park System, Dr. James Gramann, National Park Service, U.S. Department Of The Interior

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

This paper reviews research on the effects of mechanical noise and natural sound on visitor experiences in national parks. Three approaches to studying noise impacts are described. Most noise research to date has addressed the impact of air-tour overflights on visitor experiences. these impacts are localized with significant percentages of visitors in some parks reporting interference with natural sounds from aircraft noise. Research also shows that unthreatening natural environments can have significant stress-reducing effects for many people. However, it is unclear if these effects are due to hearing the sounds of nature or to a combination of hearing and seeing …

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South Manti Timber Salvage Draft Environmental Impact Statement, United States Forest Service Jan 1999

South Manti Timber Salvage Draft Environmental Impact Statement, United States Forest Service

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

The South Manti project area is located approximately 45 miles southwest of Price, Utah. The project area consists of approximately 24,597 acres of National Forest System lands within the southern portion of the Wasatch Plateau (Townships 19, 20, and 21 South; Range 4 East; SLM). This project was initiated in response to epidemic spruce beetle (Dendroctonus rufipennis) activity across the South Manti landscape. Extensive Engelmann spruce mortality has occurred as the result of epidemic spruce beetle populations. Representing over 10,000 acres, most of the spruce trees in the project area's Engelmann spruce-Subalpine fir cover type are dead or dying (70% …

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Evaluation Of The Potential Economic Impacts Of 40 Cfr 197: Environmental Radiation Standards For Yucca Mountain, Nevada, United States Environmental Protection Agency Jan 1999

Evaluation Of The Potential Economic Impacts Of 40 Cfr 197: Environmental Radiation Standards For Yucca Mountain, Nevada, United States Environmental Protection Agency

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

The Administrator of the U.S. Environmental Protection Agency (EPA), pursuant to section 801 of the Energy Policy Act of 1992 (EnPA), is proposing a rule which contains standards for the protection of the public from releases of radioactive materials stored or disposed of in the repository at the Yucca Mountain site in Nevada. This report, as required by Executive Order 12866, provides an assessment of the economic impacts of the proposed rule. As the Agency is hindered by the unavailability of necessary information to perform a rigorous quantitative economic assessment, this report provides background to the standards being proposed, a …

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