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The Mind Research Network - Mental Illness Neuroscience Discovery Grant

Description: The scientific and technological programs of the Mind Research Network (MRN), reflect DOE missions in basic science and associated instrumentation, computational modeling, and experimental techniques. MRN's technical goals over the course of this project have been to develop and apply integrated, multi-modality functional imaging techniques derived from a decade of DOE-support research and technology development.
Date: December 17, 2013
Creator: Roberts, J. & Calhoun, V.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Interpretation Of Multifrequency Crosswell Electromagnetic Data With Frequency Dependent Core Data

Description: Interpretation of cross-borehole electromagnetic (EM) images acquired at enhanced oil recovery (EOR) sites has proven to be difficult due to the typically complex subsurface geology. Significant problems in image interpretation include correlation of specific electrical conductivity values with oil saturations, the time-dependent electrical variation of the subsurface during EOR, and the non-unique electrical conductivity relationship with subsurface conditions. In this study we perform laboratory electrical properties measurements of core samples from the EOR site to develop an interpretation approach that combines field images and petrophysical results. Cross-borehole EM images from the field indicate resistivity increases in EOR areas--behavior contrary to the intended waterflooding design. Laboratory measurements clearly show a decrease in resistivity with increasing effective pressure and are attributed to increased grain-to-grain contact enhancing a strong surface conductance. We also observe a resistivity increase for some samples during brine injection. These observations possibly explain the contrary behavior observed in the field images. Possible mechanisms for increasing the resistivity in the region include (1) increased oil content as injectate sweeps oil toward the plane of the observation wells; (2) lower conductance pore fluid displacing the high-conductivity brine; (3) degradation of grain-to-grain contacts of the initially conductive matrix; and (4) artifacts of the complicated resistivity/time history similar to that observed in the laboratory experiments.
Date: June 7, 2005
Creator: Kirkendall, B & Roberts, J
Item Type: Article
Partner: UNT Libraries Government Documents Department

Surface structure determinations of crystalline ionic thin films grown on transition metal single crystal surfaces by low energy electron diffraction

Description: The surface structures of NaCl(100), LiF(100) and alpha-MgCl2(0001) adsorbed on various metal single crystals have been determined by low energy electron diffraction (LEED). Thin films of these salts were grown on metal substrates by exposing the heated metal surface to a molecular flux of salt emitted from a Knudsen cell. This method of investigating thin films of insulators (ionic salts) on a conducting substrate (metal) circumvents surface charging problems that plagued bulk studies, thereby allowing the use of electron-based techniques to characterize the surface.
Date: May 1, 2000
Creator: Roberts, J.G.
Partner: UNT Libraries Government Documents Department

Microstructural Analyses of Topopah Spring Tuff from the Large Block Test at Fran Ridge, Nevada

Description: Microstructural information (e.g., porosity, pore size distribution, and surface area) of porous media is critical to understanding water transport mechanisms and physical properties and their bearing on geophysical measurements. We report microstructural data obtained by mercury injection porosimetry (MIP) on 33 samples of densely welded Topopah Spring tuff from Fran Ridge, Yucca Mountain, Nevada Test Site (NTS), Nevada. The characterization of these samples is also important for the interpretation and analysis of the Large Block Test (LBT) performed in support of the Yucca Mountain Project (YMP). This report includes previously published data on samples from the same location (Roberts and Lin, 1996). We also present information from the Yucca Mountain Site Characterization Project/Lawrence Livermore National Laboratory (YMSCP/LLNL) Large Block Test Engineering Plan (Wilder, 1995) to allow correlation of our data directly to various planes within the Large Block.
Date: January 10, 2000
Creator: Roberts, J.J.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Project W-058 monitor and control system logic

Description: This supporting document contains the printout of the control logic for the Project W-058 Monitor and Control System, as developed by Programmable Control Services, Inc. The logic is arranged in five appendices, one for each programmable logic controller console.
Date: May 12, 1999
Creator: ROBERTS, J.B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Electromagnetic Imaging of CO2 Sequestration at an Enhanced Oil Recovery Site

Description: Lawrence Livermore National Laboratory (LLNL) is currently involved in a long term study using time-lapse multiple frequency electromagnetic (EM) characterization at a waterflood enhanced oil recovery (EOR) site in California operated by Chevron Heavy Oil Division in Lost Hills, California (Figure 1). The petroleum industry's interest and the successful imaging results from this project suggest that this technique be extended to monitor CO{sub 2} sequestration at an EOR site also operated by Chevron. The impetus for this study is to develop the ability to image subsurface injected CO{sub 2} during EOR processes while simultaneously discriminating between pre-existing petroleum and water deposits. The goals of this study are to combine laboratory and field methods to image a pilot CO{sub 2} sequestration EOR site using the cross-borehole EM technique, improve the inversion process in CO{sub 2} studies by coupling results with petrophysical laboratory measurements, and focus on new gas interpretation techniques. In this study we primarily focus on how joint field and laboratory results can provide information on subsurface CO{sub 2} detection, CO{sub 2} migration tracking, and displacement of petroleum and water over time. This study directly addresses national energy issues in two ways: (1) the development of field and laboratory techniques to improve in-situ analysis of oil and gas enhanced recovery operations and, (2) this research provides a tool for in-situ analysis of CO{sub 2} sequestration, an international technical issue of growing importance.
Date: February 28, 2001
Creator: Kirkendall, B. & Roberts, J.
Item Type: Article
Partner: UNT Libraries Government Documents Department

Land-Based Wind Potential Changes in the Southeastern United States (Presentation)

Description: Recent advancements in utility-scale wind turbine technology and pricing have vastly increased the potential land area where turbines can be deployed in the United States. This presentation quantifies the new developable land potential (e.g., capacity curves), visually identifies new areas for possible development (e.g., new wind resource maps), and begins to address deployment barriers to wind in new areas for modern and future turbine technology.
Date: September 1, 2013
Creator: Roberts, J. O.
Item Type: Article
Partner: UNT Libraries Government Documents Department

New National Wind Potential Estimates for Modern and Near-Future Turbine Technologies (Poster)

Description: Recent advancements in utility-scale wind turbine technology and pricing have vastly increased the potential land area where turbines can be deployed in the United States. This presentation quantifies the new developable land potential (e.g., capacity curves), visually identifies new areas for possible development (e.g., new wind resource maps), and begins to address deployment barriers to wind in new areas for modern and future turbine technology.
Date: January 1, 2014
Creator: Roberts, J. O.
Item Type: Article
Partner: UNT Libraries Government Documents Department

Calandria Core Weld Joint Development

Description: Abstract: The design and initial test of cutting and welding equipment developed to remotely cut and re-weld the bottom process tube joint are discussed in this report.
Date: June 30, 1965
Creator: Roberts, J. G.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Permeability of fractured tuff as functions of temperature and confining pressure

Description: Understanding the transport properties of water through fractured rock is critical to predicting and modeling the hydrothermal performance of a geologic nuclear waste repository. Previous studies indicate that intact Topopah Spring tuff from Yucca Mountain, Nevada has a low permeability, {approximately} 1 {times} 10 {sup {minus}18} m{sup 2} ({approximately}1 microDarcy). A single fracture in the tuff increases the permeability to {approximately}100 {times}10{sup {minus}15} m{sup 2} (hundreds of milliDarcies). However, fracture healing may occur when high temperature water flows through the fracture lowering the permeability by one or more orders of magnitude. We report progress on laboratory experiments on permeability of fractured Topopah Spring tuff as functions of confining pressure, temperature, and water/rock ratio.
Date: October 1, 1994
Creator: Roberts, J.J. & Lin, Wunan
Item Type: Article
Partner: UNT Libraries Government Documents Department

Electrical properties of Topopah Spring tuff as a function of saturation

Description: Much attention has been focused on the hydrologic properties of tuff from the potential nuclear waste repository at Yucca Mountain, Nevada. The successful characterization of the near-field environment of the potential repository depends on the ability to understand and predict the movement of water within the matrix and fractures when the rock mass is heated by nuclear waste. This understanding will come only after many combined laboratory experiments, field tests, and model calculations have been performed. Electrical properties, including electrical resistivity and dielectric permittivity, have been utilized in past studies to infer water content in partially saturated rocks. In this study we determine the electrical properties of Topopah Spring tuff from Yucca Mountain (Area 25), and Area 3, Nevada Test Site (NTS), NV, as a function of water content. These results will be used to (1) study the electrical properties of ted rocks as functions of saturation and water chemistry; (2) relate the observed electrical properties to the distribution of water and to the rnicrogeometry of the rock; and (3) to create a database of electrical resistivity ({rho}) and relative dielectric permittivity ({kappa}{prime}) versus water content (Sw) and temperature for rocks within the potential repository horizon. The database will be used both in laboratory experiments and field tests to determine the moisture content in rocks based on measured electrical properties.
Date: January 1, 1994
Creator: Roberts, J.J. & Lin, Wunan
Item Type: Article
Partner: UNT Libraries Government Documents Department

X-ray radiography of fracture flow and matrix imbibition

Description: Knowledge of how water flows through unsaturated, fractured rock is critical for understanding and predicting the performance of a high- level nuclear waste repository. For instance, during gravity driven fracture flow, the distance that water can travel through a fracture network might be controlled by (1) the amount of water available, (2) the fracture aperture, (3) the capillary properties of the matrix, and (4) the saturation of the matrix. We have experimentally investigated fracture flow and fracture-matrix interactions using x- ray radiography to image some of the above factors and processes.
Date: October 27, 1995
Creator: Roberts, J.J. & Lin, Wunan
Item Type: Article
Partner: UNT Libraries Government Documents Department

X-ray radiography of fracture flow and matrix imbibition in Topopah Spring Tuff under a thermal gradient

Description: A method of imaging the flow of liquid in fractures and matrix imbibition in tuff using x-ray radiography has been developed and a formulation for the calculation of saturation in the matrix based on x-ray radiography is presented. Experiments were performed using different thermal gradients and hydrostatic heads. The distance that liquid penetrates the boiling region was found to be dependent on hydrostatic head: during the highest-head experiment, liquid water penetrated the entire fracture and continued to pass through the boiling region. For experiments where flow stopped at the boiling region, x-ray images indicate crystal deposition along the fracture. In some cases, when the sample was cooled, fracture flow resumed, and in other cases the fractures were sealed and flow did not continue.
Date: March 1, 1997
Creator: Roberts, J.J., Lin, W.
Item Type: Article
Partner: UNT Libraries Government Documents Department

Report on laboratory tests of drying and re-wetting of intact rocks

Description: This report is an update on progress made during FY1995 on hydrological property measurements performed in the laboratory. The report contains descriptions of experimental designs and procedures, data, observations, preliminary analyses, and future work. The primary focus of this report is the measurement of moisture retention curves of tuff as a function of temperature for both drying and re-wetting conditions. This work is a continuation of work described in MOL80 (UCRL-ID-119033), Hydrological Property Measurements of Topopah Spring Tuff (Roberts and Lin, 1995). Knowledge of unsaturated transport properties is critical for understanding the movement of water through the unsaturated zone. Evaluation of the performance of a potential nuclear waste repository also depends on these properties. Moisture retention data are important input for models of moisture movement in unsaturated porous media. Also important is the effect of sample history on the moisture retention curves, whether or not a complete saturation cycle at elevated temperature affects the moisture retention curve at subsequent lower temperature cycles. This report addresses initial observations regarding this aspect of the research.
Date: March 1, 1996
Creator: Roberts, J.J. & Lin, Wunan
Item Type: Report
Partner: UNT Libraries Government Documents Department

Hydrological property measurements of Topopah Spring Tuff

Description: This report documents the progress made during FY 1994 on hydrological property measurements of samples from Topopah Spring tuff at Yucca Mountain, Nevada. These measurements were performed in the laboratory at Lawrence Livermore National Laboratory. This report contains descriptions of experimental designs and procedures, data, observations, and preliminary analyses, and also describes planned future work. The report is organized into three sections: (1) permeability of fractured Topopah Spring tuff as a function of temperature and confining pressure; (2) electrical properties of Topopah Spring tuff as a function of temperature and of saturation; and (3) moisture retention measurements of Topopah Spring tuff as a function of temperature.
Date: April 1, 1995
Creator: Roberts, J.J. & Lin, W.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Feasibility Study of Economics and Performance of a Hydroelectric Installation at the Jeddo Mine Drainage Tunnel. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites

Description: The U.S. Environmental Protection Agency (EPA), in accordance with the RE-Powering America's Land initiative, selected the Jeddo Tunnel discharge site for a feasibility study of renewable energy potential. The purpose of this report is to assess technical and economic viability of the site for hydroelectric and geothermal energy production. In addition, the report outlines financing options that could assist in the implementation of a system.
Date: February 1, 2013
Creator: Roberts, J. O. & Mosey, G.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Fatal Flaw Analysis of Utility-Scale Wind Turbine Generators at the West Haymarket Joint Public Agency. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites

Description: Fatal flaw analysis of utility-scale wind turbines at the West Haymarket Joint Public Agency brownfields site in Lincoln, Nebraska, funded by EPA.
Date: August 1, 2013
Creator: Roberts, J. O. & Mosey, G.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Technical and Economic Feasibility Study of Utility-Scale Wind at the Doepke-Holliday Superfund Site. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites

Description: This report is a technical and financial feasibility study of a utility-scale wind turbine on the Doepke Superfund site.
Date: May 1, 2013
Creator: Roberts, J. O. & Mosey, G.
Item Type: Report
Partner: UNT Libraries Government Documents Department

A Study of the Dielectric Properties of Dry and Saturated Green River Oil Shale

Description: We measured dielectric permittivity of dry and fluid-saturated Green River oil shale samples over a frequency range of 1 MHz to 1.8 GHz. Dry sample measurements were carried out between room temperature and 146 C, saturated sample measurements were carried out at room temperature. Samples obtained from the Green River formation of Wyoming and from the Anvil Points Mine in Colorado were cored both parallel and perpendicular to layering. The samples, which all had organic richness in the range of 10-45 gal/ton, showed small variations between samples and a relatively small level of anisotropy of the dielectric properties when dry. The real and imaginary part of the relative dielectric permittivity of dry rock was nearly constant over the frequency range observed, with low values for the imaginary part (loss factor). Saturation with de-ionized water and brine greatly increased the values of the real and imaginary parts of the relative permittivity, especially at the lower frequencies. Temperature effects were relatively small, with initial increases in permittivity to about 60 C, followed by slight decreases in permittivity that diminished as temperature increased. Implications of these observations for the in situ electromagnetic, or radio frequency (RF) heating of oil shale to produce oil and gas are discussed.
Date: February 7, 2007
Creator: Sweeney, J; Roberts, J & Harben, P
Item Type: Article
Partner: UNT Libraries Government Documents Department

ACTIVE CAPPING TECHNOLOGY - NEW APPROACHES FOR IN SITU REMEDIATION OF CONTAMINATED SEDIMENTS

Description: This study evaluated pilot-scale active caps composed of apatite, organoclay, biopolymers, and sand for the remediation of metal-contaminated sediments. The active caps were constructed in Steel Creek, at the Savannah River Site near Aiken, South Carolina. Monitoring was conducted for 12 months. Effectiveness of the caps was based on an evaluation of contaminant bioavailability, resistance to erosion, and impacts on benthic organisms. Active caps lowered metal bioavailability in the sediment during the one-year test period. Biopolymers reduced sediment suspension during cap construction, increased the pool of carbon, and lowered the release of metals. This field validation showed that active caps can effectively treat contaminants by changing their speciation, and that caps can be constructed to include more than one type of amendment to achieve multiple goals.
Date: February 13, 2012
Creator: Knox, A.; Paller, M. & Roberts, J.
Item Type: Article
Partner: UNT Libraries Government Documents Department

Naval Station Newport Wind Resource Assessment. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites, and The Naval Facilities Engineering Service Center

Description: The U.S. Environmental Protection Agency (EPA) launched the RE-Powering America's Land initiative to encourage development of renewable energy (RE) on potentially contaminated land and mine sites. EPA is collaborating with the U.S. Department of Energy's (DOE's) National Renewable Energy Laboratory (NREL) to evaluate RE options at Naval Station (NAVSTA) Newport in Newport, Rhode Island where multiple contaminated areas pose a threat to human health and the environment. Designated a superfund site on the National Priorities List in 1989, the base is committed to working toward reducing the its dependency on fossil fuels, decreasing its carbon footprint, and implementing RE projects where feasible. The Naval Facilities Engineering Service Center (NFESC) partnered with NREL in February 2009 to investigate the potential for wind energy generation at a number of Naval and Marine bases on the East Coast. NAVSTA Newport was one of several bases chosen for a detailed, site-specific wind resource investigation. NAVSTA Newport, in conjunction with NREL and NFESC, has been actively engaged in assessing the wind resource through several ongoing efforts. This report focuses on the wind resource assessment, the estimated energy production of wind turbines, and a survey of potential wind turbine options based upon the site-specific wind resource.
Date: February 1, 2012
Creator: Robichaud, R.; Fields, J. & Roberts, J. O.
Item Type: Report
Partner: UNT Libraries Government Documents Department

High energy. Progress report, March 1, 1992--February 28, 1997

Description: The Bonner Lab High Energy Group at Rice University has major hardware and software design and construction responsibilities in three of the flagship experiments of US High Energy Physics: D0, CMS, and KTeV. These commitments were undertaken after managing boards of the collaborations had evaluated the unique capabilities that Bonner Lab has to offer. Although fiscal constraints prohibited their participation in the final year of the SMC experiment (1996) on the spin dependent structure functions of nucleons, they played a major role there since it was proposed in 1988. The new results from the SMC data taken in previous years continue to generate a buzz of theoretical activity--and to increase understanding of the nucleon structure functions and their behavior as a function of Q{sup 2} and x. They have also spawned large new experimental spin physics programs at HERA and at RHIC that ultimately will provide answers to these fundamental questions. This is a direct result of the unprecedented precision and kinematic range of the SMC results. Such precision would not have been possible without the improvement in the knowledge of the muon beam polarization using the Rice-designed beam polarimeter. In D0 Bonner Lab has been active in data taking, data analysis, upgrade design, and upgrade construction projects. In CMS they are responsible for the design and construction of the trigger electronics for one of the crucial subsystems: the end cap muon detectors. Other responsibilities are fully expected as the US commitment to LHC projects becomes clearer. The technical capabilities are well matched to the enormous challenges posed by the physics measurements being contemplated for the CMS detector. KTeV will be taking data shortly. Rice made major contributions to the construction and commissioning of this experiment. The long list of publications and presentations during the past five years attests to ...
Date: September 1, 1996
Creator: Bonner, B.E. & Roberts, J.B. Jr.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Relative humidity in the near-field environment

Description: The Yucca Mountain Site Characterization Project is investigating Yucca Mountain, Nevada, for its suitability as a potential repository for high-level nuclear wastes. United States federal regulation 10CFR60 requires that radioactive nuclides be substantially contained in waste packages for 300 to 1000 years after the emplacement. To meet the regulation, a waste package container should remain intact for several hundreds of years. It has been shown that high humidity increases the corrosion potential of metallic container materials. Relative humidity as a function of water saturation in intact rock is measured. The results of this test can be used to calibrate the relative humidity in the near-field environment predicted by model calculations using thermal-hydrological codes such as VTOUGH. This is a report on the progress of that experiment.
Date: October 27, 1995
Creator: Lin, W.; Roberts, J. & Ruddle, D
Item Type: Article
Partner: UNT Libraries Government Documents Department