Filters: School Or College: "College of Mines & Earth Sciences" Collection: "ir_uspace" Format: "application/pdf"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 226 |
 |
Miller, Jan D. | Separation of bitumen from Utah tar sands by a hot water digestion-flotation technique | Tar sand deposits in the state of Utah contain more than 25 billion bbl of in-place bitumen. Although 30 times smaller than the well-known Athabasca tar sands, Utah tar sands do represent a significant domestic energy resource comparable to the national crude oil reserves (31.3 billion bbl). Based ... | Tar sand; Utah; Bitumen; Hot water separation; Froth flotation | 1978 |
| 227 |
 |
Miller, Jan D.; Wan, Rong Yu | Significance of carbon properties in the enhanced ferric sulfate leaching of CuFeS2/C aggregates | Acid ferric sulfate solution has been used for heap and dump leaching of low-grade chalcopyrite ores and is being considered as a possible lixiviant for the hydrometallurgical processing of copper sulfide concentrates. For many years, researchers have attempted to explain the leaching behavior of ch... | Ferric sulfate; CuFeS2; Particulate carbon | 1984 |
| 228 |
 |
Miller, Jan D. | Significance of electrokinetic characterization for interpreting interfacial phenomena at planar, macroscopic interfaces | Streaming potential measurements provide valuable information for the validation and interpretation of interfacial phenomena that occur at flat macroscopic surfaces. Planar substrates have been extensively used for the interpretation of events, which occur at particulate surfaces; however, these fla... | Interfacial phenomena; Surface charge | 2005 |
| 229 |
 |
Miller, Jan D. | Significance of graphitic structural features in gold adsorption by carbon | The nature of surface sites for the adsorption of gold from alkaline cyanide solutions has been investigated using samples of synthetic, highly-oriented pyrolytic graphite (HOPG). This HOPG material offers an idealized graphite structure enabling the independent study of the graphitic basal-plane ... | Graphite carbons; Gold; Adsorption | 1992 |
| 230 |
 |
Chapman, David S.; Harris, Robert N. | Snow and the ground temperature record of climate change | Borehole temperature-depth profiles contain a record of surface ground temperature (SGT) changes with time and complement surface air temperature (SAT) analysis to infer climate change over multiple centuries. Ground temperatures are generally warmer than air temperatures due to solar radiation effe... | Snow cover; Snow modeling; land/atmosphere interactions; Borehole climate reconstructions; Surface air temperature; Ground surface temperature; Borehole temperatures; Geothermal observations; Heat transfer | 2002 |
| 231 |
 |
Miller, Jan D. | Solvent extraction reagents for gold recovery from alkaline cyanide solutions | Three different solvent extraction systems for the recovery of gold from alkaline cyanide solutions are reviewed. These include the modified amine extractants in which the basicity of simple alkyl amines, with respect to the aurocyanide anion, is controlled by the addition of alkyl phosphorous ester... | Solvents; Extraction; Gold; Alkaline cyanide; Amine extractants; Solvating extractants; Substituted guanidines | 1993 |
| 232 |
 |
Miller, Jan D.;Yu, Qiang | Solvent refining of coal resin concentrates | Certain bituminous coals of the western United States are known to contain appreciable quantities of macroscopic resinite (fossil resin). Such resinous coals are found in the states of Arizona, Colorado, New Mexico, Utah, Washington, Wyoming, etc. Among these, the Wasatch Plateau coal field in ce... | 1994 | |
| 233 |
 |
Brown, Francis Harold | Some early pleistocene deposits of the lower Omo valley: the Usno formation | Early Pleistocene deposits of the Rudolf Basin have been described by E. Brumpt (Bourg de Bozas, 1903: 107 ff.), Arambourg (1943: 190 ff.), Fuchs (1939), Patterson (1966), and Butzer and Thurber (1969). These include the Omo Beds, first recognized by Brumpt in 1902 and subsequently studied by Arambo... | 1969 | |
| 234 |
 |
Miller, Jan D. | Spectroscopic analysis of passivation reactions for carbonaceous matter from carlin trend ores | Abstract. Three different refractory carbonaceous gold ores from the Carlin operation in northeastern Nevada were investigated to characterize the effect of passivation treatments on the nature of the carbonaceous material. The carbonaceous material was chemically isolated from the ores and pass... | Gold; Chlorine; Cyanidation | 1990 |
| 235 |
 |
Chapman, David S.; Harris, Robert N. | Stop-go temperature logging for precision applications | We describe a new field procedure for stop-go temperature logging of boreholes that attains millikelvin precision. Temperature is recorded continuously throughout the entire log, but the logging probe is held stationary for a fixed time at discrete depth intervals. Equilibrium temperatures at the di... | Temperature logging; Boreholes; Stop-go logging method | 2007 |
| 236 |
 |
Miller, Jan D. | Structure and composition of commercial copper chelate extractants | The structure, properties, and composition of commercial chelating-type copper extractants are examined. Characterization of these extractants was accomplished using organic separation techniques and analytical tools such as NMR and infrared spectroscopy. Results indicate that only the trans isomer ... | LIX® reagents; stoichiometry; reaction mechanism | 1973 |
| 237 |
 |
Miller, Jan D. | Study of particle-bubble interaction using atomic force microscopy: current possibilities and challenges | Study of interaction forces between mineral particles and air bubbles is a key to understanding flotation processes. Measurement of such interaction forces has only recently been made possible with the introduction of the atomic force microscope (AFM) and the colloidal probe technique. Using AFM, in... | Particle-bubble interaction; Atomic Force Microscopy (AFM); Hydrophobic force; Contact angle; Hydrodynamic force | 2002 |
| 238 |
 |
Miller, Jan D. | Surface characterization and new tools for research | In the selective separation of mineral phases by flotation, surface chemistry is the principal determinant of the average contact angle for a specific mineral phase in flotation pulp. The average contact angle is, in turn, the principal determinant of the bubble-particle attachment efficiency in th... | Flotation; Minerals; Surface chemistry; Contact angle | 2007 |
| 239 |
 |
Miller, Jan D. | Surface chemistry of pulping and flotation for mixed office wastepaper | The effect of pulping reagents on the de-inking flotation of laser printed wastepaper was investigated with regard to the removal efficiency of toner and mineral filler particles at different pH values. These results show that caustic pulping causes the toner to be released from the fibers as larg... | Pulping reagents; Deinking; Toner; Mineral fillers | 1997 |
| 240 |
 |
Miller, Jan D. | Surface phase transitions of adsorbed collector molecules as revealed by in-situ FT-IR/IRS spectroscopy | It has been shown by inspection of FT-IR/IRS spectra that the alkyl conformation of adsorbed collectors can be determined. The conformations of adsorbed collectors were interpreted in terms of bulk solution phases of the collectors. Such analysis was performed on the CaF2/oleate, A1203/SDS and KC1/... | Oleates; Micellar; In situ analysis; Adsorption | 1993 |
| 241 |
 |
Miller, Jan D. | Surfactant adsorption density calculation from Fourier transform infrared external reflection spectroscopy (FTIR/ERS) | An equation to calculate surfactant adsorption density from Fourier transform infrared external reflection spectra was established. The derivation and limitation of this equation are discussed in detail. The validation of the FTIR/ERS adsorption density equation was experimentally verified from t... | Surfactant; Adsorption density; Solid film | 2003 |
| 242 |
 |
Miller, Jan D. | Synthesis of DME from CO₂/H₂ gas mixture | The activity and durability of two hybrid bifunctional dimethyl ether (DME) synthesis catalysts: 6CuO-3ZnO-Al2O3/ƴ-Al2O3 and 6CuO-3ZnO-1Al2O3/HZSM-5, have been evaluated for the conversion of CO2/H2 to DME at 260oC, 5 MPa, and gas per hourly space velocity (GHSV) of 3000 mL gcat -1 h-1 in fixed-bed... | 2011-01-01 | |
| 243 |
 |
Miller, Jan D. | Tar sand pretreatment with diluent | Important aspects of kerosene penetration into tar sand have been investigated. The natural tar sand porosity was measured and used to analyze the performance of the hot water process. Subsequently, pretreatment experiments, using 20-kg tar sand samples (Asphalt Ridge and Whiterocks, Utah) and ker... | Tar sand; Kerosene; Porosity; Temperature | 1993 |
| 244 |
 |
Chapman, David S. | Techniques, analysis, and noise in a Salt Lake Valley 4D gravity experiment | Repeated high-precision gravity measurements using an automated gravimeter and analysis of time series of 1-Hz samples allowed gravity measurements to be made with an accuracy of 5 μGal or better. Nonlinear instrument drift was removed using a new empirical staircase function built from multiple ... | Gravity measurements | 2008 |
| 245 |
 |
Miller, Jan D. | The behavior of arsenic trioxide in non-ferrous extractive metallurgical processing | Study of the acid bake-leach process has shown potential advantages for the treatment of enargite (Cu3AsS4) concentrates. Among the most important advantages of the process is the transformation of enargite to water-soluble copper sulfate and highly soluble arsenic trioxide (arsenolite). Because ars... | 2014-01-01 | |
| 246 |
 |
Brown, Francis Harold | The evolution of neogene terrestrial ecosystems in Europe | The Pliocene-Pleistocene chronology of hominid and other vertebrate evolution in East Africa is largely constrained by isotopic dating and regional intercorrelation of volcanic ash layers. Some eruptions were of sufficient magnitude or duration that their widespread tephra dispersal defines a serie... | 1999 | |
| 247 |
 |
Jewell, Paul | The geology and geothermal setting of the Magic Reservoir Area, Blaine and Camas Counties, Idaho | The Magic Reservoir area straddles the Blaine- Camas county line in south-central Idaho, along the northern boundary of the central Snake River Plain. The rocks exposed at Magic Reservoir include a 5.8- million-year-old rhyolite flow, the Pliocene Square Mountain Basalt, multiple cooling units ... | 1982 | |
| 248 |
 |
Brown, Francis Harold | The lower Omo basin | The boundaries of the Lower Omo Basin have been mapped by Fuchs (1939) and by Butzer (1970, 1971) in a general way. The structural features and physiography of the eastern and central part of the Lower Omo Basin are best expressed on the maps of Davidson et al. (1973). Walsh and Dodson (1969) have m... | 1983 | |
| 249 |
 |
Jarrard, Richard D. | The magnetostratigraphy of ocean drilling program leg 105 sediments | During Leg 105 of the Ocean Drilling Program, a series of 11 holes was drilled at three sites along a north-south transect in Baffin Bay and the Labrador Sea. Intermittent recovery and drilling disturbance, resulting in part from the harsh weather conditions encountered, hampered magnetostratigraph... | 1989 | |
| 250 |
 |
Chapman, David S. | Thermal analysis of the southern Powder River Basin, Wyoming | Temperature and geologic data from over 3000 oil and gas wells within a 180 km x 30 km area that transect across the southern Powder River Basin in Wyoming, U.S.A., were used to determine the present thermal regime of the basin. Three-dimensional temperature fields within the transect, based on... | Thermal analysis; Inversion; Bottom hole temperature | 1996-11 |