UScholar Works
 
Filters: School Or College: "College of Mines & Earth Sciences" Collection: "ir_uspace" Format: "application/pdf"
101 - 125 of 275
Number of results to display per page
CreatorTitleDescriptionSubjectDate
101 Zhdanov, Michael S.Focusing geophysical inversion imagesA critical problem in inversion of geophysical data is developing a stable inverse problem solution that can simultaneously resolve complicated geological structures. The traditional way to obtain a stable solution is based on maximum smoothness criteria. This approach, however, provides smoothe...Focusing; Geophysical inversion images; Minimum gradient support functionals; MGS1999
102 Fernandez, Diego P.Formulation for the static permittivity of water and steam at temperatures from 238 K to 873 K at pressures up to 1200 MPa, including derivatives and Debye- Hückel coefficientsA new formulation is presented of the static relative permittivity or dielectric constant of water and steam, including supercooled and supercritical states. The range is from 238 K to 873 K, at pressures up to 1200 MPa. The formulation is based on the ITS-90 temperature scale. It correlates a selec...Static relative permittivity; Dielectric constant1997
103 Miller, Jan D.;Yu, QiangFossil resin, a value-added product from western coalCertain bituminous coals of the western United States are known to contain appreciable quantities of macroscopic fossil resin (resinite). Such resinous coals are found in the states of Arizona, Colorado, New Mexico, Utah, Washington, Wyoming, etc. The Wasatch Plateau coal field in Utah (Figure 1)...Resinite; Solvent refining; Wasatch Plateau; Hydrogenation1992
104 Chandran, RaviFracture toughness of two Cr2Hf+Cr intermetallic composites as a function temperatureFracture toughness as a function of temperature was evaluated for two Cr2Hf+Cr intermetallic composites, each in two different microstructural conditions. The proeutectic microstructures based on Cr-6.5Hf (at%) showed a significant increase in fracture toughness with an increase from room temperatur...Fracture toughness; Fracture resistance; Intermetallic composites; Proeutectic microstructures; Eutectic microstructures1994
105 Miller, Jan D.Free and emulsified oil removal by bubble accelerated flotation (BAF)Operational data from full-scale field applications and pilot tests using the Bubble Accelerated Flotation ( B A R system for the treatment of wastewater are presented. The compact BAF system based on the air-sparged hydrocyclone technology was designed to remove pollutants from industrial waste and...Bubble accelerated flotation; Air-sparged hydrocyclone; Flocculants; Oil-in-water emulsion1999
106 Miller, Jan D.Further considerations of magnetic deinking for wastepaper recycling millsMagnetic de-inking has been shown to be an efficient process for the removal of certain toner particles from mixed office waste (MOW) furnishes. It is possible to achieve a dirt removal of 96% with the WHIMS (wet high intensity magnetic separator) if all toner particles present in the furnish are at...Magnetic deinking; Paper pulp; Wastepaper; Mixed office waste; (MOW)1998
107 Reichler, Thomas J.GCIP water and energy budget synthesis (WEBS)As part of the World Climate Research Program's (WCRPs) Global Energy and Water-Cycle Experiment (GEWEX) Continental-scale International Project (GCIP), a preliminary water and energy budget synthesis (WEBS) was developed for the period 1996-1999 from the "best available" observations and models.Hydrologic cycle; Water cycle; Water and energy budgets; Regional models; Land surface models2002
108 Garrett, Timothy J.Gains in economic energy efficiency as the impetus for increasing atmospheric carbon dioxideGrowth of anthropogenic carbon dioxide (CO2) emissions is frequently diagnosed as a product of population, per capita economic production, the energy intensity of economic production (or inverse of its energy efficiency), and the carbon intensity of energy. This paper introduces an alternative, p...carbon dioxide, energy efficiency, economics2007-12-17
109 Jarrard, Richard D.Geochemical results from wireline logs in the Celebes Sea, Sites 767 and 770 of Leg 124Geochemical well logs were obtained at ODP Sites 767 and 770 in the Celebes Sea. The log data obtained at sea have been corrected for borehole size changes, the effects of drilling fluids, and logging-speed variations. The processed logs are then used to calculate the amounts of the three major ra...1991
110 Jewell, PaulGeochemical variations in an alpine lake and watershed underlain by siliciclastic bedrock, Uinta Mountains, UtahA small watershed which includes several small lakes in the Uinta Mountains of northern Utah is underlain by monolithologic Precambrian siliciclastic rock with extremely limited buffering capacity. In spite of this, s\ stematic spatial and temporal variations in alkalinity, pH, and major elements oc...1998-01-01
111 Jewell, PaulGeochemistry and paleoceanographic setting of Central Nevada bedded baritesThe bedded barite deposits of central Nevada are hosted by rocks of the Roberts Mountains allochthon and constitute the largest barite reserves in North America. Detailed geochemical studies of three barite deposits in the Devonian Slaven Chert indicate that rocks surrounding the barite have elevate...Bedded barites; Roberts Mountains allochthon; Late Devonian1991
112 Brown, Francis HaroldGeological development of the Omo-Turkana Basin during the pliocene and pleistocene epochsPliocene and Pleistocene deposits of the Omo-Turkana Basin extend from 6?N latitude to about 2?N latitude (-450 km), and laterally from about 35.5?E to 36.5?E. Sediments are brought to the basin by the Omo River which rises in Ethiopia, and by the Turkwel and Kerio Rivers which rise in Kenya and Uga...2004
113 Jewell, PaulGeology and geothermal potential North of Wells, NevadaThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, ...Tertiary sediments; Siltstones; Conglomerates; Lithologies; Well logs; Aquifers; Step faults1982-01-01
114 Jarrard, Richard D.Geometry of Pleistocene facies on the Great Barrier Reef outer shelf and upper slope - seismic stratigraphy of sites 819, 820, and 821Seismic stratigraphic analysis of the sedimentary succession intersected in Ocean Drilling Program (ODP) Sites 819, 820, and 821, on the outer shelf and upper slope seaward of the Great Barrier Reef, provides a clear indication of the importance of sediment supply and depositional base-level as two ...1993
115 Jarrard, Richard D.Geophysical properties of oceanic crust at Sites 768 and 770Velocity, density, resistivity, and neutron-porosity logs were recorded in virtually the entire 222-m-thick section of basaltic back-arc crust drilled at Site 768 and through the 106-m section of MORB crust at Site 770. Our analysis of these logs and comparison with measurements on discrete cores pe...1991
116 Chapman, David S.Geothermics and climate change: 1. Analysis of borehole temperatures with emphasis on resolving powerTemperature-depth data from six boreholes in western Utah and nine boreholes in southeastern Utah are reanalyzed for evidence of ground surface temperature (GST) histories. We invert the temperature-depth data using the functional space inverse algorithm of Shen and Beck [1991, 1992] which we prefer...Surface air temperature; Ground surface temperature; Borehole temperatures; Geothermal observations; Geothermics1998
117 Chapman, David S.Geothermics and climate change: 2. Joint analysis of borehole temperature and meteorological dataLong-period ground surface temperature variations contained in bore hole temperature-depth profiles form a complementary climate change record to high-frequency, but noisy surface air temperature (SAT) records at weather stations. We illustrate the benefits of jointly analyzing geothermal and meteo...Surface air temperature; Ground surface temperature; Borehole temperatures; Geothermal observations; Heat transfer1998
118 Chapman, David S.Global warming - just hot air?We know from weather station records that Earth's surface temperature has increased on average by 0.6 degrees C in the last 100 years. The 1990s have been the warmest decade on record. Over the same period, global sea level has increased by 10-20 cm. We know also that planet Earth has an atmosphere ...Greenhouse Effect; Climate change1998
119 Miller, Jan D.Gold flotation from Colorado River sand with the air-sparged hydrocyclonePilot-scale tests indicate that effective concentration of fine gold from Colorado River sands can be achieved by flotation with the air-sparged hydrocyclone. The fine sands (55% -kOQ mesh and 0 01 opt *) from gravity concentration were processed with a 5-cm air-sparged hydrocyclone (capacity -1.0 t...Gold; Hydrocyclones; Sand; Flotation1986
120 Brown, Francis HaroldGombe group basalts and initiation of pliocene deposition in the Turkana depression, northern Kenya and southern EthiopiaA little before 4 Ma ago, deposition of Pliocene and Pleistocene strata described as the Omo Group began in the Turkana and Omo basins of northern Kenya and southern Ethiopia. Soon after, basaltic magma erupted as thin lava flows, and intruded as dykes into the oldest Pliocene strata of the basin. T...2004
121 Chapman, David S.; Harris, Robert N.; Allis, Richard GeorgeGravity signals at the Geysers geothermal systemThree high-precision gravity and GPS surveys have been conducted over The Geysers geothermal reservoir and surrounding area. These surveys, in September 2000, April 2001, and September 2001, provide an initial baseline for future imaging studies of spatial mass changes from the Santa Rosa Efflu...Ground water change; Gravity surveys2002
122 Steenburgh, William JamesGreat Salt Lake-effect precipitation: observed frequency, characteristics, and associated environmental factorsThis climatology examines the environmental factors controlling the frequency, occurrence, and morphology of Great Salt Lake-effect (GSLE) precipitation events using cool season (16 September-15 May) Weather Surveillance Radar-1988 Doppler (WSR-88D) imagery, radiosonde soundings, and MesoWest surfac...2012-01-01
123 Chapman, David S.; Picard, M. DaneHeat flow in the Uinta Basin determined from bottom hole temperature (BHT) dataThe thermal resistance (or Bullard) method is used to judge the utility of petroleum well bottom-hole temperature data in determining surface heat flow and subsurface temperature patterns in a sedimentary basin. Thermal resistance, defined as the quotient of a depth parameter AZ and thermal con...Thermal analysis; Bottom hole temperature1984-04
124 Miller, Jan D.High resolution X-ray microtomography based micro finite element analysis of mechanical properties of cellular materialThe macroscopic mechanical (elastic) properties of closed foams (ROHACELL) estimated from micro finite element analysis are reported in this paper. The complex 3D geometries of ROHACELL foams with different densities were analyzed using high resolution X-ray microtomography (HRXMT). The microstructu...2013-01-01
125 Jarrard, Richard D.High-resolution geochemical variations at Sites 723, 728, and 731: a comparison of X-ray fluorescence and geochemical logsGeochemical logging is a routine part of the Ocean Drilling Program, yet the reliability of ODP geochemical logs has rarely been evaluated quantitatively. On ODP Leg 117, geochemical logs were obtained at Sites 723, 728, and 731. We report here an evaluation of ODP geochemical log quality based on h...1991
101 - 125 of 275