Physical Sciences and Mathematics Commons^™

A Photochemical Equilibrium Model For Ionospheric Conductivity, C. E. Rasmussen, Robert W. Schunk, Vincent B. Wickwar

All Physics Faculty Publications

A photochemical equilibrium model of the high-latitude ionosphere has been developed. This model provides densities of the ionospheric constituents, N₂ ⁺, O₂ ⁺, O⁺, and NO⁺, from 85 km to approximately 220 km. These densities are then used to calculate Pedersen and Hall conductivities. A comparison of the model results with Arecibo and Chatanika radar observations was made, covering periods of solar minimum and solar maximum. The comparison showed the model to predict ionospheric densities to within 50% and conductivities to within 40% in the illuminated portion of the ionosphere. In regions …

Comparison Of Simultaneous Chatanika And Millstone Hill Temperature Measurements With Ionospheric Model Predictions, C. E. Rasmussen, Jan Josef Sojka, Robert W. Schunk, Vincent B. Wickwar, O. De La Beaujariere, J. Foster, J. Holt

All Physics Faculty Publications

As part of the MITHRAS program, the Chatanika and Millstone Hill incoherent scatter radars made coordinated observations of the polar ionosphere on June 27 and 28, 1981. The temperature data obtained during these days were compared with predictions made by a high-latitude ionospheric model. The comparison of the temperature measurements and the results of the ionospheric model depend on the assumptions made both in reducing the data and on the inputs that are needed by the model. The deduction of electron temperature from radar measurements depends upon a knowledge of the mean ion mass as a function of altitude. The …

Low-Temperature Ion Beam Mixing In Metals, S J. Kim, M A. Nicolet, R S. Averback, David Peak

All Physics Faculty Publications

A systematic study of ion-beam mixing of tracer impurities in thin metal films at low temperatures has been conducted. We have investigated the dependence of ion mixing on two matrix properties: atomic mass and cohesive energy. We have also studied the dependence of ion mixing on tracer impurity properties: its heat of mixing with the matrix and its thermal diffusivity in the matrix. The matrices investigated were thin films of C, Al, Ti, Fe, Ni, Cu, Mo, Ru, Ag, Hf, Ta, W, Pt, and Au. The tracer impurities, Al, Ti, Cr, Mn, Fe, Ni, Cu, Y, Nb, Mo, Ru, Ag, …

Observations Of Auroral E Region Plasma Waves And Electron Heating Witheiscat And A Vhf Radar Interferometer, J. Providakes, D. T. Farley, B. G. Fejer, J. Sahr, W. E. Swartz, I. Haggstrom, A. Hedberg, J. A. Nordling

All Physics Faculty Publications

Two radars were used simultaneously to study naturally occurring electron heating events in the auroral E-region ionosphere. During a joint campaign in March 1986 the Cornell University Portable Radar Interferometer (CUPRI) was positioned to look perpendicular to the magnetic field to observe unstable plasma waves over Tromsø, Norway, while EISCAT measured the ambient conditions in the unstable region. On two nights EISCAT detected intense but short lived (< 1 min) electron heating events during which the temperature suddenly increased by a factor of 2–4 at altitudes near 108 km and the electron densities were less than 7 × 104 cm−3. On the second of these nights CUPRI was operating and detected strong plasma waves with very large phase velocities at precisely the altitudes and times at which the heating was observed. The altitudes, as well as one component of the irregularity drift velocity, were determined by interferometric techniques. From the observations and our analysis, we conclude that the electron temperature increases were caused by plasma wave heating and not by either Joule heating or particle precipitation.

Spectral Momentum Density From Graphite From (E,2e) Spectroscopy: Comparison With First Principles Calculations, Chao Gao, A. L. Ritter, Jr Dennison, N. A. W. Holzwarth

Journal Articles

We have measured the spectral momentum density p(E,q) of graphite by (e,2e) spectroscopy for momentum parallel and perpendicular to the crystal c axis. In the independent-electron approximation, p(E,q) = Σ_G |U_k(G)|² δ(q-k-G)δ(E-E(k)) where the one-electron wave function is Ψ_k(r) = e^ik•rΣ_GU_k(G)e^iG•r and G is a reciprocal-lattice vector. The measurements covered a range of momentum parallel to the c axis equal to 0 ≤ |q| ≤ 1.84Å^-1 and a …

Great Salt Lake Interisland Diking: Water Quality Considerations, Executive Summary, Utah Water Research Laboratory, J. P. Riley, J. I. Blandamer, W. J. Doucette, R. R. Dupont, A. W. Grover, J. Herrick, J. M. Ihnat, J. E. Mclean, M. W. Nath, S. R. Rushforth, J. L. Sims, R. C. Sims, W. A. Wurtsbaugh

Reports

No abstract provided.

Evaluating Statistical Techniques For Predicting And Interpreting Forplan Results, United States Department Of Agriculture, Forest Service

Forestry

Two approaches using multiple linear regression for analyzing the effects of management constraints on an objective function in FORPLAN were tested on three National Forests. The two approaches, ordinary least squares regression and ordinary least squares using principal components, provide some degree of success in predicting objective function values, but very little information for interpreting the effects of the constraints on objective function values.

Index To Information On Insects Associated With Western Wildland Shrubs, U.S. Forest Service

Range Management

Provides brief summary of available information on insects associated with wildland shrubs; also provides index system to access information from published literature and insect collection records.

Fossil Butte Environmental Assessment, Develop Visitor, Administrative, And Maintenance Facilities, United States, Department Of The Interior, National Park Service

Environmental Assessments (WY)

The National Park Service (NPS) proposes to construct the first permanent visitor, administrative, and maintenance facilities at Fossil Butte National Monument since its Congressional establishment in 1972. Proposed facilities include: a 4,800-square-foot visitor center and administrative building on a 2-acre site approximately 1 mile north of Lincoln County Road 300; and a 2,000-square-foot maintenance building, materials storage yard, and seasonal-employee housing unit on a 5-acre site near the southwest corner of the monument. The employee housing unit is not part of this package and would be constructed at a later date if additional funding becomes available. Other proposed development includes …

Grand Teton National Park, Environmental Assessment, Reconstruction Of Teton Park Road And Jenny Lake Road, United States Department Of The Interior, National Park Service

Environmental Assessments (WY)

Reconstruction is proposed for 12 miles of the Teton Park Road between Moose Junction and North Jenny Lake Junction, as well as 6.5 miles of the Jenny Lake one-way loop road and the 0.5 mile long String Lake road. The project is being planned and designed in two segments. Segment A extends between Moose Junction and a point near the Climbers Ranch road intersection (4 miles north of Moose Junction), and segment B continues from that point to North Jenny Lake junction and includes modification of the String/Jenny Lake road and parking complex. Segment A would be constructed under a …

Proposed Resource Management Plan And Final Environmental Impact Statement For The Cody Resource Area, Worland District, Wyoming, United States Department Of The Interior Bureau Of Land Management

Resource Management Plans (WY)

This document addresses alternatives for managing almost 1.1 million acres fo federal land and about 1.5 million acres of federal mineral estate administered by the Cody Resource Area, Worland District, Bureau of Land Management (see map 1). The plan focuses on three resource management issues relating to vegetative resources, special management area designations, and resource accessibility and manageability.

Vibrational Frequencies And Intensities Of H‐Bonded And Li‐Bonded Complexes. H3n⋅⋅Hcl And H3n⋅⋅Licl, M. M. Szczesniak, I. J. Kurnig, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

The geometries, energetics, and vibrational spectra are calculated for the two complexes at the SCF and correlated MP2 levels using the 6‐31G∗∗ basis set, augmented by a second set of d functions on Cl. While correlation represents an important factor in the binding of H₃ N⋅⋅HCl, it contributes little to the stronger Li bond. Unlike the HCl stretch ν_s which decreases substantially in frequency and is greatly intensified in H₃ N⋅⋅HCl, the frequency of the LiCl stretch undergoes an increase and little change is noted in its intensity, conforming to prior spectral measurements. The intensities of the …

Vibrational Frequencies And Intensities Of H‐Bonded And Li‐Bonded Complexes. H3n⋅⋅Hcl And H3n⋅⋅Licl, M. M. Szczesniak, I. J. Kurnig, Steve Scheiner

Steve Scheiner

The geometries, energetics, and vibrational spectra are calculated for the two complexes at the SCF and correlated MP2 levels using the 6‐31G∗∗ basis set, augmented by a second set of d functions on Cl. While correlation represents an important factor in the binding of H₃ N⋅⋅HCl, it contributes little to the stronger Li bond. Unlike the HCl stretch ν_s which decreases substantially in frequency and is greatly intensified in H₃ N⋅⋅HCl, the frequency of the LiCl stretch undergoes an increase and little change is noted in its intensity, conforming to prior spectral measurements. The intensities of the …

Optimized Spectroscopic Signal Estimates Using Integration And Matched Filters, Stephen E. Bialkowski

Stephen E. Bialkowski

This paper examines theories of signal processing as applied to peak magnitude estimation in absorption and emission spectroscopy. Signals obtained from Fourier transform, fixed wavelength, and scanning dispersive instruments are modeled in terms of the time required to obtain a spectrum. The differences between these techniques and the signal processing procedures that should be used for each technique are characterized for a Lorentzian spectral feature. Including the time required to scan over a range of optical frequencies results in optimal signal processing procedures that are different from those previously supposed. In particular, it is found that the optimal matched filter …

Bubbles Without Cores, T. C. Shen

T. -C. Shen

The decay of a false vacuum in a theory without a true vacuum is studied. Using variational arguments, we find that for a class of potentials of the type aφⁱ+bφⁱ (a>0, b<0 and i2φ²—ηφ³+ λφ⁴ is presented to discuss the transition from a thin-wall bubble to a thick-walled one. The validity conditions of using these solutions to describe the false vacuum decay within the framework of the semiclassical approximation are discussed.

Final Environmental Impact Statement Aptus Industrial And Hazardous Waste Treatment Facility, U.S. Department Of The Interior

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

The environmental impact statement for the proposed aptus industrial and hazardous waste treatment facility analyzes the environmental impacts of the proposed transfer, storage, and incineration facility, and the the transportation and utility corridors through construction, operation, and closure.

Flood Insurance Study City Of Duchesne, Utah, Duchesne County, Federal Emergency Management Agency

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

This Flood Insurance Study investigates the existence and severity of flood hazards in the City of Duchesne, Duchesne County, Utah, and aids in the administration of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has developed flood risk data for various areas of the community that will be used to establish actuarial flood insurance rates and assist the community in its efforts to promote sound flood plain management. Minimum flood plain management requirements for participation in the National Flood Insurance Program (NFIP) are set forth in the Code of Federal Regulations …

Dolores Project Colorado, Final Supplement To The Final Environmental Statement, United States Department Of The Interior

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

This Final Supplement to the Final Environmental Statement (FES) to the Dolores Project describes project modifications since completion of the 1977 Final Environmental Statement on May 9, 1977, (FES 77-12) and a Finding of No Significant Impact approved May 11, 1981, for the addition of two hydroelectric powerplants to the project. The project modifications include adding salinity control and changing the alignment of the Towaoc Canal from west of Cortez, Colorado, to the east of the city. In addition, refinements would be made to the project plan by deleting Monument Creek Reservoir and the Cortez-Towaoc Municipal and Industrial Pipeline from …

Flood Insurance Study, City Of Provo, Utah, Utah County, Federal Emergency Management Agency

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

This Flood Insurance Study revises and updates a previous Flood Insurance Study/Flood Insurance Rate Map for the City of Provo, Utah. This information will be used by the City to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional planners to further promote sound land use and floodplain development.

National List Of Plant Species That Occur In Wetlands: 1988, Nevada, Porter B. Reed, Jr.

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

The National List of Plant Species That Occur in Wetlands: 1988 (National List) represents the combined efforts of many biologists over the last decade to define the wetland flora of the United States. The National List has undergone a number of revisions resulting from intensive review by regional ecologists. National, regional and State lists are being distributed to provide users with the most current information. We welcome and encourage modification and improvement of the National List. Refinement of the National List will occur continually, reflecting increased knowledge in Indicator assignments, taxonomy, and geographic distribution. We anticipate that further refinement of …

Theoretical Vibrational Study Of The Fx⋅⋅⋅O(Ch3)2 Hydrogen‐Bonded Complex, Y. Bouteiller, C. Mijoule, M. M. Szczesniak, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

This paper presents the first ab initio attempt to reconstruct the observed band profile of the stretching fundamental v_FX (X=H,D) in the FX⋅⋅⋅O(CH₃)₂ hydrogen‐bonded system. The two‐dimensional potential energy surface V(r_FH,R_F⋅⋅⋅O) is evaluated by means of large basis set SCF calculations. The related force constants up to the fourth order are obtained via the analytical fit to a polynomial expansion. The vibrational problem is solved by means of a variational treatment which includes the effects of mechanical anharmonicity. The side bands of the …

Stochastic Interpolation Of Precipitation Data From Multiple Sensors, D. J. Seo, A. Azimi-Zonooz, D. S. Bowles, W. F. Krajewski, C. J. Duffy, K. P. Georgakakos, T. H. Lee

Reports

Introduction: This report summarizes the work conducted under Grant No. ECE-8419189, "Stochastic Interpolation of Precipitation Data from Multiple Sensors," which was awarded to Utah State University in September, 1985, and completed February 29, 1988. it also covers work under a supplemental award made in February, 1986. The final report is organized into four sections. The following section presents the objective of the research and a brief problem statment. Section 3 contains a summary of second-year work including the project team, work plan, work completed, and publications. In Section4, project conclusions are summarized. A summary of on-going future work is given …

Great Salt Lake Interisland Diking: Water Quality Considerations, John I. Blandamer, William J. Doucette, Ryan R. Dupont, Anthony W. Grover, James Herrick, Jean M. Ihnat, Joan E. Mclean, Michael W. Nath, Samuel R. Rushforth, Judith L. Sims, Ronald C. Sims, Wayne A. Wurtsbaugh

Reports

No abstract provided.

Friction Factor Tests On High Density Polyethylene Pipe, Steven L. Barfuss

Reports

No abstract provided.

The O-O Collision Cross-Section: Can It Be Inferred From Aeronomical Measurements?, R G. Burnside, C A. Tipley, Vincent B. Wickwar

All Physics Faculty Publications

No abstract provided.

Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 1. The Unstablelayer And Gradient Drift Waves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker

Bela G. Fejer

Electric field and plasma density instrumentation on board a sounding rocket launched from Punta Lobos, Peru, detected intense electrostatic waves indicative of plasma instabilities in the daytime equatorial electrojet. Simultaneous measurements taken by the Jicamarca radar showed strong 3-m type 1 electrojet echoes as well as evidence of kilometer scale horizontally propagating waves. The in situ electric field wave spectra displayed three markedly different height regions within the unstable layer: (1) a two-stream region on the topside between 103 and 111 km where the electron current was considered to be strongest, (2) a gradient drift region between 90 and 106.5 …

The Condor Equatorial Electrojetcampaign: Radar Results, E. Kudeki, Bela G. Fejer, D. T. Farley, C. Hanuise

Bela G. Fejer

A review of the experimental and theoretical background to the Condor equatorial electrojet campaign is followed by the presentation and discussion of VHF radar interferometer and HF radar backscatter data taken concurrently with two rocket in situ experiments reported in companion papers (Pfaff et al., this issue (a, b). Both experiments were conducted in strongly driven periods with the on-line radar interferometer displaying signatures of what has been interpreted in earlier radar work (Kudeki et al., 1982) as kilometer scale gradient drift waves. Low-frequency density fluctuations detected by in situ rocket sensors confirm the earlier interpretation. VHF radar/rocket data comparisons …

Electric Field And Plasmadensity Measurements In The Strongly-Driven Daytime Equatorial Electrojet: 2. Two-Streamwaves, R. F. Pfaff, M. C. Kelley, E. Kudeki, Bela G. Fejer, K. D. Baker

Bela G. Fejer

Both primary and secondary two-stream (Farley-Buneman) waves have been detected by in situ electric field and plasma density probes in the strongly driven daytime equatorial electrojet over Peru. Simultaneous Jicamarca radar observations showed strong vertical and oblique 3-m type 1 echoes, also indicative of the two-stream mechanism. The rocket data show the two-stream region on the topside of the unstable layer to be situated between 103 and 111 km where the electron current was the strongest. This region was characterized by broadband plasma oscillations extending past 1 kHz in the rocket frame. Furthermore, above 106.5 km, where the electron density …

Great-Tailed Grackle Predation On South Texas Citrus: (Identifying A Unique Problem), John Hobbs, Fred G. Leon Iii

Wildlife Damage Management Conference

The December 1983 freeze inflicted tremendous damage to the South Texas citrus groves and reduced tree numbers by approximately fifty percent. Additionally, it is believed that Great-tailed grackle (Quiscalus mexicanus) populations have increased over the past few years. With decreased citrus acreage and increased grackle numbers, the severe negative effects are economically significant to the Texas citrus industry.

Grackle damage to grapefruit and oranges differs in type and economic importance. The first is "cosmetic" in nature, small pecks or scratches on the fruit skin, and downgrades the fruit, reducing its value. The second is actual crop loss due …

Environmental Assessment Of Remedial Action At The Mexican Hat Uranium Mill Tailings Site, Mexican Hat, Utah, U.S. Department Of Energy

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

This document assesses the environmental impacts of the proposed remedial action at the Mexican Hat uranium mill tailings site located on the Navajo Reservation in southern Utah. The site covers 235 acres and contains 69 acres of tailings and several of the original mill structures. The Uranium Mill Tailings Radiation Control Act (UMTRCA) of 1978, Public Law 95-604 (PL95-604), authorized the U.S. Department of Energy to clean up the site to reduce the potential health impacts associated with the residual radioactive materials remaining at the site. The U.S. Environmental Protection Agency promulgated standards for the remedial action (40 CFR Part …