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Utah State University

1998

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Articles 31 - 60 of 100

Full-Text Articles in Physical Sciences and Mathematics

Thermal Decomposition Of Cp*Re(Co)(No)No2, Kale Allen Swainston May 1998

Thermal Decomposition Of Cp*Re(Co)(No)No2, Kale Allen Swainston

Undergraduate Honors Capstone Projects

The focus of this work is to examine the thermal reactivity of the Cp*Re(CO)(NO)NO2 complex. Upon heating with a flame, the orange crystals decompose very rapidly, with a darkening of color and gas production. To investigate this reaction, the decomposition was carefully controlled by heating with N2 gas, and in heated solution. The products obtained from the heated solution were purified using column chromatography, yielding two new interesting compounds, believed to be Cp*ReNO dimers with bridging oxygens.

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A Preliminary Analysis Of The Fluid History Of A Normal Fault In The Keno Pit, Alligator Ridge Mining District, White Pine County, Nevada, John G. Solum May 1998

A Preliminary Analysis Of The Fluid History Of A Normal Fault In The Keno Pit, Alligator Ridge Mining District, White Pine County, Nevada, John G. Solum

Undergraduate Honors Capstone Projects

The flow of oil along faults is only poorly understood. In many cases a fault is the only means of transportation for the oil from its area of deposition to its current location. This assumption is reasonable due to chemical fingerprinting of oil. In some cases the oil in a reservoir and the oil in a fault zone have been analyzed chemically and found to be the same. The problem is this; early in a fault's history it produces a thin layer of fine-grained material between its fault surfaces. This condition is not conductive to fluid flow. Therefore another mechanism …

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Site-Directed Mutagenesis Of The Nitrogenase Fe-Protein From Azotobacter Vinelandii, Talmage L. Shill May 1998

Site-Directed Mutagenesis Of The Nitrogenase Fe-Protein From Azotobacter Vinelandii, Talmage L. Shill

Undergraduate Honors Capstone Projects

Nitrogen fixation is the chemical reaction of dinitrogen (N2) being reduced to ammonia (NH3). This reaction occurs naturally by nitrogen fixing microorganisms which contain the enzyme nitrogenase. The overall reaction is written below.

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Environmental Assessment For The Designation Of The Continental Divide National Scenic Trail, United States Department Of The Interior, Bureau Of Land Management Apr 1998

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

Environmental Assessments (WY)

On October 2, 1968, Congress passed the National Trails System Act. This Act called for the establishment of a system of national scenic trails "which will be extended trails so located as to provide for maximum outdoor recreation potential and for the conservation and enjoyment of the nationally significant scenic, historic, natural, or cultural qualities of the areas through which such trails may pass." As a result of 1978 amendment to this Act, Congress designated the Continental Divide National Scenic Trail (CDNST) as part of the National Scenic Trail system. The CDNST is a trail route traversing the length of …

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Epa Superfund Record Of Decision: Murray Smelter Murray City, Ut, Epa Apr 1998

Epa Superfund Record Of Decision: Murray Smelter Murray City, Ut, Epa

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

The Murray Smelter Site ("the Site") is located in the city of Murray, Utah, in Salt Lake County as illustrated on Figure 1. The Site includes the former operational areas of the Murray Smelter and adjacent Germania Smelter which are referred to as the "on-facility" area., as well as surrounding residential and commercial areas where airborne emissions from the smelters impacted the environment or where contamination in shallow ground water may be transported in the future. These surrounding areas are referred to as the "off-facility" area. The on-facility area is approximately 142 acres. Its boundaries are 5300 South Street to …

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Application Of Tomographic Inversion In Studying Airglow In The Mesopause Region, T. Nygren, Michael J. Taylor, M. S. Lehtinen, M. Markkanen Apr 1998

Application Of Tomographic Inversion In Studying Airglow In The Mesopause Region, T. Nygren, Michael J. Taylor, M. S. Lehtinen, M. Markkanen

All Physics Faculty Publications

It is pointed out that observations of periodic nightglow structures give excellent information on atmospheric gravity waves in the mesosphere and lower thermosphere. The periods, the horizontal wavelengths and the phase speeds of the waves can be determined from airglow images and, using several cameras, the approximate altitude of the luminous layer can also be determined by triangulation. In this paper the possibility of applying tomographic methods for reconstructing the airglow structures is investigated using numerical simulations. A ground-based chain of cameras is assumed, two-dimensional airglow models in the vertical plane above the chain are constructed, and simulated data are …

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Dynamic And Chemical Aspects Of The Mesospheric Na ‘Wall’ Event On 9 October 1993 During The Aloha Campaign, G. R. Swenson, J. Qian, J. M.C. Plane, P. J. Espy, Michael J. Taylor, D. N. Turnbull, R. P. Lowe Apr 1998

Dynamic And Chemical Aspects Of The Mesospheric Na ‘Wall’ Event On 9 October 1993 During The Aloha Campaign, G. R. Swenson, J. Qian, J. M.C. Plane, P. J. Espy, Michael J. Taylor, D. N. Turnbull, R. P. Lowe

All Physics Faculty Publications

On October 9, 1993, observations were made from the National Center for Atmospheric Research Electra aircraft during a flight from Maui, Hawaii, toward a low-pressure system NW of the island, a flight of 7 hours in total. The leading edge (wall) of a bright airglow layer was observed 900 km NW of Maui at 0815 UT, which was traveling at 75 m s−1 toward the SE, reaching Haleakala, Maui, about 3.25 hours later [see Swenson and Espy, 1995]. An intriguing feature associated with the event was the large increase in the mesospheric Na column density at the wall (∼180%). The …

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Games To Teach Mathematical Modelling, James A. Powell, Jim S. Cangelosi, Ann M. Harris Mar 1998

Games To Teach Mathematical Modelling, James A. Powell, Jim S. Cangelosi, Ann M. Harris

Mathematics and Statistics Faculty Publications

We discuss the use of in-class games to create realistic situations for mathematical modelling. Two games are presented which are appropriate for use in post-calculus settings. The first game reproduces predator-prey oscillations and the second game simulates disease propagation in a mixing population. When used creatively these games encourage students to model realistic data and apply mathematical concepts to understanding the data.

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Full-Wave Modeling Of Small-Scale Gravity Waves Using Airborne Lidar And Observations Of The Hawaiian Airglow (Aloha-93) O(1s) Images & Coincident Na Wind/Temperature Lidar Measurements, M. P. Hickey, Michael J. Taylor, C. S. Gardner, C. R. Gibbons Mar 1998

Full-Wave Modeling Of Small-Scale Gravity Waves Using Airborne Lidar And Observations Of The Hawaiian Airglow (Aloha-93) O(1s) Images & Coincident Na Wind/Temperature Lidar Measurements, M. P. Hickey, Michael J. Taylor, C. S. Gardner, C. R. Gibbons

All Physics Faculty Publications

Measurements were made of mesospheric gravity waves in the OI (5577 Å) nightglow observed from Maui, Hawaii, during the Airborne Lidar and Observations of Hawaiian Airglow (ALOHA-93) campaign. Clear, monochromatic gravity waves were observed on several nights. By using a full-wave model that realistically includes the major physical processes in this region, we have simulated the propagation of four waves through the mesopause region and calculated the O(1 S) nightglow response to the waves. Mean winds derived from Na wind/temperature lidar observations were employed in the computations. Wave amplitudes were calculated based on the requirement that the observed and simulated …

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Observational Limits For Lidar, Radar And Airglow Imager Measurements Of Gravity Wave Parameters, C. S. Gardner, Michael J. Taylor Mar 1998

Observational Limits For Lidar, Radar And Airglow Imager Measurements Of Gravity Wave Parameters, C. S. Gardner, Michael J. Taylor

All Physics Faculty Publications

By examining the observational limits and biases for lidar, radar, and airglow imager measurements of middle atmosphere gravity waves, we provide plausible explanations for the characteristics of the monochromatic wave parameters that have been reported during the past decade. The systematic dependencies of vertical and horizontal wavelength on wave period, reported in many lidar and some radar studies, are associated with diffusive damping. The prominent waves with the largest amplitudes, most often observed by lidars and radars, are those with vertical phase speeds near the diffusive damping limit. The narrow range of horizontal phase velocities of the waves seen by …

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Decision Record For The Environmental Assessment For Coal Planning Decisions In The Carbon Basin Area Of The Great Divide Resource Area, United States Department Of The Interior, Bureau Of Land Management Jan 1998

Decision Record For The Environmental Assessment For Coal Planning Decisions In The Carbon Basin Area Of The Great Divide Resource Area, United States Department Of The Interior, Bureau Of Land Management

Record of Decisions (WY)

The Federal Coal Leasing Amendments Act of 1976 requires that Federal coal lands to be considered for leasing must be identified in a comprehensive land use plan. At the time the Great Divide Resource Management Plan (GDRA RMP, 1990) was prepared, approximately 60% of the Federal coal lands in the Carbon Basin Coal Area were leased and exempt from the coal screening/planning process. Subsequently, development of this lease was never pursued and the lease expired. In addition, the coal screening/planning process was not conducted on the remainder of the Federal coal lands in the Carbon Basin area during the RMP …

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Record Of Decision And Finding Of No Significant Impact For The Shirley Mountain Planning Review Travel Management, United States Department Of The Interior, Bureau Of Land Management Jan 1998

Record Of Decision And Finding Of No Significant Impact For The Shirley Mountain Planning Review Travel Management, United States Department Of The Interior, Bureau Of Land Management

Record of Decisions (WY)

The planning review was conducted to analyze and weigh the affects of retaining or changing the Off-Road Vehicle (ORV) designation for the BLM-administered public lands within the Shirley Mountain Planning Review Area. The proposed decision considers comments received during public scoping and the 45-day comment period for the Shirley Mountain Planning Review Travel Management Environmental Assessment (EA).

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Post-Stocking Dispersal Habitat Use, And Behavioral Acclimation Of Juvenile Razorback Suckers (Xyrauchen Texanus) In Two Colorado River Reservoirs, United States Geological Survey Jan 1998

Post-Stocking Dispersal Habitat Use, And Behavioral Acclimation Of Juvenile Razorback Suckers (Xyrauchen Texanus) In Two Colorado River Reservoirs, United States Geological Survey

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

Information pertaining to post-stocking dispersal and habitat use of endangered razorback sucker (Xyrauchen Texanus) is primarily limited to the adult life stage. Radio or sonic transmitters are normally surgically implanted in the fish's abdominal cavity.

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Ruby Canyon/Black Ridge Guidebook For Natural Ignition Fire Planning And Implementation, United States Bureau Of Land Management Jan 1998

Ruby Canyon/Black Ridge Guidebook For Natural Ignition Fire Planning And Implementation, United States Bureau Of Land Management

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

The RCBR Natural Ignition Fire (NIF) Guide establishes procedures for implementing fire management activities within the planning area. The RCBR NIF Guide follows direction established in the Ruby Canyon/Black Ridge Integrated Resource Management Plan and the Grand Junction Resource Management Plan (RMP). This guide will be incorporated into the Grand Junction District's Fire Management Action Plan, which is the document that implements overall fire management based on direction derived from the the RMP.

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Razorback Sucker (Xyrauchen Texanus) Recovery Plan, Harold M. Tyus Jan 1998

Razorback Sucker (Xyrauchen Texanus) Recovery Plan, Harold M. Tyus

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

The Colorado River of the American West supports a mainstream fish community that is classified as the “Big River” fishes. Four of these fishes are listed as endangered under provisions of the Endangered Species Act of 1973, as amended. Three fishes (i.e., Colorado pike minnow Ptychocheilus Lucius, humpback chub Gila cypha, and bonytail G. elegans) have been listed for over 10 years, and they have recovery plans that were prepared prior to designation of critical habitats. Recently the Colorado squawfish was renamed by the American Fisheries Society and hereafter will be refered to in this document as the Colorado pike …

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Overcoming The Multiplex‐Disadvantage Using Maximum‐Likelihood Inversion, Stephen E. Bialkowski Jan 1998

Overcoming The Multiplex‐Disadvantage Using Maximum‐Likelihood Inversion, Stephen E. Bialkowski

Stephen E. Bialkowski

A maximum-likelihood estimator, derived under quantum-noiselimited measurement conditions, is used to obtain wavenumber-ordered spectra produced by a model Michelson interferometer. The estimator is tested on a number of synthetic interferograms, and results are compared to similar spectra obtained by using the Fourier (cosine) transform. It is found that the maximum-likelihood inversion method does not result in white noise in the spectrum estimate when the spectrum is sparse. It thus may be used to circumvent the main disadvantage in multiplexed spectrometer measurements using quantum-noise-limited detectors for emissionbased measurements. It is also found that maximum-likelihood inversion methods can be used to obtain …

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Games To Teach Mathematical Modelling, James A. Powell, J. Cangelosi, A. M. Harris Jan 1998

Games To Teach Mathematical Modelling, James A. Powell, J. Cangelosi, A. M. Harris

James A. Powell

We discuss the use of in-class games to create realistic situations for mathematical modelling. Two games are presented which are appropriate for use in post-calculus settings. The first game reproduces predator{prey oscillations and the second game simulates disease propagation in a mixing population. When used creatively these games encourage students to model realistic data and apply mathematical concepts to understanding the data.

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Geometry,Mechanisms, And Significance Of Extensional Folds From Examples In The Rockymountain Basin And Range Province, Susanne U. Janecke, C. J. Vandenburg, J. J. Blankenau Jan 1998

Geometry,Mechanisms, And Significance Of Extensional Folds From Examples In The Rockymountain Basin And Range Province, Susanne U. Janecke, C. J. Vandenburg, J. J. Blankenau

Susanne U. Janecke

No abstract provided.

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Cloud Peak Wilderness Management Direction Final Environmental Assessment For The Amendment To The Bighorn National Forest Land And Resource Management Plan, United States Forest Service Jan 1998

Cloud Peak Wilderness Management Direction Final Environmental Assessment For The Amendment To The Bighorn National Forest Land And Resource Management Plan, United States Forest Service

Environmental Assessments (WY)

The purpose of this EA is to amend the Land and Resource Management Plan (LRMP) for the Wilderness Management Standards and Guidelines (S&Gs). The need for the revised S&Gs is to provide more definable and measurable standards related to the items described in the Proposed Action. Current S&Gs do not provide sufficient direction to determine the trend of the Cloud Peak Wilderness (CPW) condition or require conflicting actions. The proposed S&Gs will facilitate determination of the trend of physical, biological and social aspects of the wilderness resource.

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Challis Resource Area Proposed Resource Management Plan And Final Environmental Impact Statement Volume 2 (Of 2), United States Department Of The Interior, Bureau Of Land Management Jan 1998

Challis Resource Area Proposed Resource Management Plan And Final Environmental Impact Statement Volume 2 (Of 2), United States Department Of The Interior, Bureau Of Land Management

Resource Management Plans (ID)

The climate of the Challis Resource Area is influenced primarily by maritime air carried eastward on prevailing westerly winds. General climatic characteristics are abundant sunshine, low humidity, and high evaporation. The major precipitation source, particularly for winter storms, is the Northern Pacific Ocean. In the summer, however, most of the thunderstorm activity is caused by moisture-laden air originating from the south, off the Pacific coast of Mexico.

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The Uses Of Existing Information In The Process Of Setting Social Standards For Proposed Wilderness Areas Of Zion National Park, Mark E. Vande Kamp Jan 1998

The Uses Of Existing Information In The Process Of Setting Social Standards For Proposed Wilderness Areas Of Zion National Park, Mark E. Vande Kamp

Elusive Documents

No abstract provided.

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Climate Change And Utah, United States Environmental Protection Agency Jan 1998

Climate Change And Utah, United States Environmental Protection Agency

Elusive Documents

No abstract provided.

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Spruce Ecosystem Recovery Project Final Environmental Impact Statement, United States Forest Service Jan 1998

Spruce Ecosystem Recovery Project Final Environmental Impact Statement, United States Forest Service

Final environmental Impact Statements (UT)

This Final Environmental Impact Statement documents the analysis of the Proposed Action, two action alternatives, and the No Action alternative developed for the Spruce Ecosystem Recovery Project (SERP) area. The Proposed Action and action alternatives considered in detail are consistent with current management direction. Each alternative responds differently to the issues associated with the Proposed Action.

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Observed Coupling Of The Mesosphere Inversion Layer To The Thermal Tidal Structure, J W. Meriwether, X Gao, Vincent B. Wickwar, T D. Wilkerson, K C. Beissner, S C. Collins, M E. Hagan Jan 1998

Observed Coupling Of The Mesosphere Inversion Layer To The Thermal Tidal Structure, J W. Meriwether, X Gao, Vincent B. Wickwar, T D. Wilkerson, K C. Beissner, S C. Collins, M E. Hagan

All Physics Faculty Publications

Rayleigh lidar observations of mesosphere temperature profiles obtained from 40 to ∼100 km from Logan, Utah (41.7, 111.8 W, altitude, 1.9 km) over 10 nights in late February, 1995, revealed an interesting development between 60 to 75 km of a winter mesosphere inversion layer with an amplitude of ∼20–30 K and a downward phase progression of ∼1 km/hr. The data also showed two altitude regions exhibiting significant cooling of 10–30 K in extent. These were located below and above the peak of the inversion layer, respectively, at altitudes of ∼50–55 km and ∼70–80 km. When these results were compared with …

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Secondary Electron Emission And Spacecraft Charging, Neal Nickles, John R. Dennison Jan 1998

Secondary Electron Emission And Spacecraft Charging, Neal Nickles, John R. Dennison

All Physics Faculty Publications

Spacecraft charging due to the natural plasma environment found in all orbits is known to produce many of the observed spacecraft anomalies and failures. A primary factor in adverse spacecraft charging is the secondary electron emission of differing materials on the spacecraft. Precipitating electrons and ions from the plasma to spacecraft surfaces can result in varying amounts of charge being released, depending on the secondary electron yield of the materials; this can lead to arcing between surfaces. NASA's Space and Environments Effects (SEE) program has recognized the need to improve their current materials database for modeling spacecraft charging and have …

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A Compact Rotating-Mirror Autocorrelator Design For Femtosecond And Picosecond Laserpulses, D. Mark Riffe, A. J. Sabbah Jan 1998

A Compact Rotating-Mirror Autocorrelator Design For Femtosecond And Picosecond Laserpulses, D. Mark Riffe, A. J. Sabbah

All Physics Faculty Publications

An interferometric rapid-scanning autocorrelator employing two antiparallel rotating mirrors in a variable arm is optimized for maximum optical path difference as a function of the separation of the two rotating mirrors. A very compact design (mirror separation≈mirror diameter) is possible without a reduction in the maximum pulse width that can be measured.

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The Role Of Anadromous Sockeye Salmon (Oncorhynchus Nerka) In The Nutrient Loading And Productivity Of The Sawtooth Valley Lakes, Idaho, H. P. Gross, Wayne A. Wurtsbaugh, Chris Luecke Jan 1998

The Role Of Anadromous Sockeye Salmon (Oncorhynchus Nerka) In The Nutrient Loading And Productivity Of The Sawtooth Valley Lakes, Idaho, H. P. Gross, Wayne A. Wurtsbaugh, Chris Luecke

Watershed Sciences Faculty Publications

We constructed a simulation model for Redfish Lake, Idaho, using water budget and nutrient loading measurements, to predict the dependence of lake production on nutrients from the watershed, precipitation, lake fertilization, and marine-derived nutrients from sockeye salmon Oncorhynchus nerka, which historically have reared in the lake. We also used the model to simulate different management scenarios to help restore the endangered Snake River sockeye salmon. The model and other empirical evidence indicated that even before hydropower dams were present in the migration corridor, marine-derived nutrients were not of major importance to lake production, contributing only about 3% of the annual …

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Adding Nutrients To Enhance The Growth Of Endangered Sockeye Salmon: Trophic Transfer In An Oligotrophic Lake, Phaedra E. Budy, Chris Luecke, Wayne A. Wurtsbaugh Jan 1998

Adding Nutrients To Enhance The Growth Of Endangered Sockeye Salmon: Trophic Transfer In An Oligotrophic Lake, Phaedra E. Budy, Chris Luecke, Wayne A. Wurtsbaugh

Watershed Sciences Faculty Publications

Snake River sockeye salmon Oncorhynchus nerka, listed under U.S. law as endangered in 1991 in response to a decline in anadromous adult numbers, spend their first 1–2 years in Redfish Lake, Idaho, before migrating to the sea. To determine how nutrient enhancement might influence phytoplankton, zooplankton, and fish production, we performed fertilization experiments in large enclosures in this oligotrophic lake using juvenile kokanee (lacustrine O. nerka) as analogues for endangered sockeye salmon. Fertilization of the metalimnion substantially increased chlorophyll a (150%), phytoplankton biovolume (75%), primary productivity (250%), and zooplankton biomass (200%), and moderately increased fish growth (12%) over our control …

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Ruby Canyon/Black Ridge Integrated Resource Management Plan, United States Bureau Of Land Management Jan 1998

Ruby Canyon/Black Ridge Integrated Resource Management Plan, United States Bureau Of Land Management

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

The purpose of this plan is to maintain ecosystem health, facilitate multiple use management, while meeting human needs in providing a diversity of benefit opportunites. The need for the plan is to promote biodiversity and sustainable ecosystems while meeting human needs for a variety of uses such as high quality recreation activities and grazing.

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Clow Point Winter Recreation Parking Area Environmental Assessment, United States Forest Service Jan 1998

Clow Point Winter Recreation Parking Area Environmental Assessment, United States Forest Service

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

Payette National Forest proposes to authorize the construction, maintenance, and operation of a two-acre winter recreation parking site just below the Goose Creek overlook (Clow Point) along the Goose Lake Road (FDR #257).

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