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Creator | Title | Description | Subject | Date |
| 201 |
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Miller, Jan D. | Anisotropic character of talc surfaces as revealed by streaming potential measurements, atomic force microscopy, and molecular dynamics simulations | A study of the interfacial properties of the basal plane and the edge surfaces of talc is described in this paper. The isoelectric-point measured at the two different crystallographic planes by the streaming potential method was found to be similar and exists at about pH 3.0. In the case of the edg... | Streaming potential; Scanning electron microscope; Atomic force microscope | 2006 |
| 202 |
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Zhdanov, Michael S. | Novel approach to the model appraisal and resolution analysis of regularized geophysical inversion | The existing techniques for appraisal of geophysical inverse images are based on calculating the model resolution and the model covariance matrices. In some applications, however, it becomes desirable to evaluate the upper bounds of the variations in the solution of the inverse problem. It is possib... | Geophysical inversion; Electromagnetic modeling; Cauchy inequality; Resolution analysis; Lanczos decomposition method; SLDM; Voisey's Bay; 3-D modeling | 2006 |
| 203 |
 |
Miller, Jan D. | Experimental evaluation of a mineral exposure model for crushed copper ores | Copper mineral inclusions dispersed in crushed ore particles have a certain size distribution (grain-size distribution). For efficient heap leaching processes, the crushing plant should be designed and operated to crush the ore to an appropriate particle-size distribution so that copper mineral grai... | Grains; Particles; Distribution | 2006 |
| 204 |
 |
Zhdanov, Michael S. | Integral equation method for 3D modeling of electromagnetic fields in complex structures with inhomogeneous background conductivity | We present a new formulation of the integral equation (IE) method for three-dimensional (3D) electromagnetic (EM) modeling in complex structures with inhomogeneous background conductivity (IBC). This method overcomes the standard limitation of the conventional IE method related to the use of a horiz... | 3-D modeling; Integral equation method; Marine controlled-source electromagnetic data; MCSEM; Gemini Prospect; Gulf of Mexico | 2006 |
| 205 |
 |
Miller, Jan D. | Atomic force microscopy investigation of interaction forces between polyethylene and asphaltene surfaces | Many petroleum-derived asphalts used for road construction exhibit poor rheological properties. These properties of asphalt can be improved by addition of various polymer fillers to the asphalt blend. Recycled polyolefines, especially polyethylene and polypropylene have been used as the asphalt mo... | Asphalt; Rheology; Polyolefins | 2006 |
| 206 |
 |
Miller, Jan D. | Pilot-plant evaluation of a water insoluble hydroxamic acid collector for single stage flotation of Florida phosphate rock | Recent laboratory results have demonstrated that selective flotation of phosphate rock can be achieved in a single stage with improved separation efficiency when compared to the standard double float process. The new reagent chemistry is based on the use of a water insoluble alcoholic solution of ... | Phosphate rock; Flotation; Double float; Separation | 2006 |
| 207 |
 |
Rajamani, Raj | Online SAG mill pulse measurement and optimization semi-annual technical progress report | The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient breakage of particles depends on the conditions inside the mill. However, any kind of monitoring device to measure... | | 2006 |
| 208 |
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Jewell, Paul | Controls of tufa development in Pleistocene Lake Bonneville, Utah | Prominent tufa localities along the Provo level (∼14,000 14C yr B.P.) shoreline in Pleistocene Lake Bonneville have been characterized in detail. Three types of tufa are recognized: capping tufa, beachrock, and capping tufa over beachrock. Capping tufa and beachrock are end members of a continuum ... | Tufa; Pleistocene; Pluvial lakes | 2006 |
| 209 |
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Miller, Jan D. | Trithiocarbonates for PGM flotation | Small replacements of C12-trithiocarbonate (C12-TTC) for dithiocarbonate DTC)/dithiophosphate (DTP) in a reagent suite for the flotation of platinum group metals (PGM) have significantly improved the rejection of gangue. Coupled to this is an improvement in kinetics, grade and recovery of PGMs. In ... | | 2006 |
| 210 |
 |
Zhdanov, Michael S. | Fast numerical modeling of multitransmitter electromagnetic data using multigrid quasi-linear approximation | Multitransmitter electromagnetic (EM) surveys are widely used in remote-sensing and geophysical exploration. The interpretation of the multitransmitter geophysical data requires numerous three-dimensional (3-D) modelings of the responses of the receivers for different geoelectrical models of comple... | Multitransmitter electromagnetic data; Numerical modeling; Multigrid quasi-linear approximation; Quasilinear approximation; geophysical exploration; 3-D modeling | 2006-06 |
| 211 |
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Reichler, Thomas J.; Staten, Paul W. | Use of radio occultation for long-term tropopause studies: uncertainties, biases, and instabilities. | Research suggests that changes in tropopause structure can both indicate and impact changes in the global climate system. The Global Positioning System radio occultation (RO) technique shows tremendous potential for monitoring the global tropopause due to its precision, temporal consistency, and ... | Radio occultation; Tropopause; Climate | 2007 |
| 212 |
 |
Zhdanov, Michael S. | Rigorous 3D inversion of marine CSEM data based on the integral equation method | Marine controlled-source electromagnetic (MCSEM) surveys have become an important part of offshore petroleum exploration. However, due to enormous computational difficulties with full 3D inversion, practical interpretation of MCSEM data is still a very challenging problem. We present a new approach ... | | 2007 |
| 213 |
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Miller, Jan D.; Niewiadomski, Marcin M.; Hupka, Jan; Nalaskowski, Jakub | Air bubble and oil droplet interactions in centrifugal fields during air-sparged hydrocyclone flotation | The interactions of air bubbles and oil droplets in centrifugal flotation have been considered with respect to process conditions present during Air-sparged Hydrocyclone (ASH) flotation. Encounter efficiency of oil droplets with air bubbles has been found to be significantly smaller when compared t... | Centrifugal flotation; Froth flotation; Oil flotation; Dispersed oil; Air-sparged hydrocyclone; ASH | 2007 |
| 214 |
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Miller, Jan D.; Nalaskowski, Jakub | Flotation chemistry and technology of nonsulfide minerals | The dimensions of nonsulfide flotation technology extend in many directions, as might be expected from the diversity of the mineral classes, which include soluble salt minerals (potash, borax, and trona), semisoluble salt minerals (phosphate minerals, fluorite, calcite, and barite), and insoluble ox... | Flotation; Insoluble collectors; Salt minerals; Nonsulfide minerals | 2007 |
| 215 |
 |
Miller, Jan D. | Anisotropic character of talc surfaces as revealed by streaming potential measurements, atomic force microscopy, molecular dynamics simulations and contact angle measurements | A study of the interfacial properties of the basal plane and the edge surfaces of talc is described in this paper. The isoelectric points measured at two different crystallographic surfaces by the streaming potential method were found to be similar and exist at about pH 3.0. In the case of the edge... | Talc; Interfacial properties; Hydration; Atomic force microscopy; Molecular dynamics simulations; Edge surface; Basal plane | 2007 |
| 216 |
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Miller, Jan D. | Development and application of centrifugal flotation systems in wastewater treatment | Flotation as a wastewater treatment technique is designed to remove all particles generally encountered as very fine emulsions, suspended solids, and colloids from wastewater. Historically, Dissolved Air Flotation (DAF) has been used to achieve this removal. More recently, other flotation techniques... | Wastewater treatment; Centrifugal flotation; Liquid cyclone mixing; Hybrid centrifugal dissolved-air flotation; ASH; BAF; GEM; FF | 2007 |
| 217 |
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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 |
| 218 |
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Fernandez, Diego P. | Deep-sea scleractinian coral age and depth distributions in the Northwest Atlantic over the last 225,000 years | Deep-sea corals have grown for over 200,000 yrs on the New England Seamounts in the northwest Atlantic, and this paper describes their distribution both with respect to depth and time. Many thousands of fossil scleractinian corals were collected on a series o f cruises from 2003- 2005; by contrast,... | Desmophyllum dianthus; Scleractinian coral; Seamounts; Northwest Atlantic | 2007 |
| 219 |
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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 |
| 220 |
 |
Reichler, Thomas J. | Expansion of the Hadley cell under global warming | A consistent weakening and poleward expansion of the Hadley circulation is diagnosed in the climate change simulations of the IPCC AR4 project. Associated with this widening is a poleward expansion of the subtropical dry zone. Simple scaling analysis supports the notion that the poleward extent of ... | Hadley cell; Climate change; Subtropical dry zone | 2007 |
| 221 |
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Fernandez, Diego P. | Lowering the detection limit for arsenic: implications for a future practical quantitation limit | Exposure to arsenic (As) in drinking water is associated with an increased risk ol bladder, liver, kidney, ,ind skin cancers (Smith et al, 2002; NRG DIEGO P. FERNANDEZ, 2001). To mitigate these risks? the US Environmental Protection Agency AND JANET G. HERING (USEPA) revised the maximum contaminant ... | Practical quantitation limit; Chlorine | 2007 |
| 222 |
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Zhdanov, Michael S. | Integral electric current method in 3-D electromagnetic modeling for large conductivity contrast | Abstract-We introduce a new approach to 3-D electromagnetic (EM) modeling for models with large conductivity contrast. It is based on the equations for integral current within the cells of the discretization grid, instead of the electric field or electric current themselves, which are used in the c... | Electromagnetic modeling; Integral electric current method; 3-D modeling; High conductivity contrast; Integral equations | 2007-05 |
| 223 |
 |
Jarrard, Richard D. | Exceptionally preserved jellyfishes from the Middle Cambrian | Cnidarians represent an early diverging animal group and thus insight into their origin and diversification is key to understanding metazoan evolution. Further, cnidarian jellyfish comprise an important component of modern marine planktonic ecosystems. Here we report on exceptionally preserved cnida... | Jellyfishes; Metazoan evolution; Jellyfish fossils; Marjum Formation; Utah; Middle Cambrian | 2007-10-31 |
| 224 |
 |
Garrett, Timothy J. | Gains in economic energy efficiency as the impetus for increasing atmospheric carbon dioxide | Growth 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, economics | 2007-12-17 |
| 225 |
 |
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 |
