UNT Libraries Government Documents Department - 16 Matching Results

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A 3-D hydrodynamic dispersion model for modeling tracer transport in Geothermal Reservoirs

Description: A 3-D hydrodynamic dispersion model for tracer transport is developed and implemented into the TOUGH2 EOS3 (T2R3D) module. The model formulation incorporates a full dispersion tensor, based on a 3-D velocity field with a 3-D, irregular grid in a heterogeneous geological system. Two different weighting schemes are proposed for spatial average of 3-D velocity fields and concentration gradients to evaluate the mass flux by dispersion and diffusion of a tracer or a radionuclide. This new module of … more
Date: January 26, 1998
Creator: Wu, Yu-Shu & Pruess, Karsten
Item Type: Refine your search to only Article
open access

Computer code selection criteria for flow and transport code(s) to be used in undisturbed vadose zone calculations for TWRS environmental analyses

Description: The Tank Waste Remediation System (TWRS) is responsible for the safe storage, retrieval, and disposal of waste currently being held in 177 underground tanks at the Hanford Site. In order to successfully carry out its mission, TWRS must perform environmental analyses describing the consequences of tank contents leaking from tanks and associated facilities during the storage, retrieval, or closure periods and immobilized low-activity tank waste contaminants leaving disposal facilities. Because of… more
Date: January 26, 1998
Creator: Mann, F. M.
Item Type: Refine your search to only Report
open access

Defense Export Loan Guarantee Program (DELG)

Description: This report provides an overview of the Defense Export Loan Guarantee Program (DELG) which became operational on November 8, 1996. It discusses the major features of the program, which is aimed at assisting prospective foreign purchasers of U.S. defense equipment finance those purchase through private sector loans.
Date: January 26, 1998
Creator: Grimmett, Richard F.
Item Type: Refine your search to only Report
open access

Determination of silica scale deposition rates and thresholds applied toward protection of injection reservoirs. Quarterly progress report, August 1--December 31, 1997

Description: Instrumentation and the components required for the probe and reactor assemblies were procured. Probes were fabricated and tested to assess their sensitivity to scaling. In October, the focus was on design and fabrication of the reactors. This required close coordination with welding and machine shop subvendors. Contact was made with the two Nevada power plants where the experimental equipment will be field tested. Each has indicated their support for the project and will accommodate field test… more
Date: January 26, 1998
Creator: Booth, G.M. III
Item Type: Refine your search to only Report
open access

The dielectric boundary condition for the embedded curved boundary (ECB) method

Description: A new version of ECB has been completed that allows nonuniform grid spacing and a new dieledric boundary condition. ECB was developed to retain the simplicity and speed of an orthogonal mesh while capturing much of the fidelity of adaptive, unstructured finite element meshes. Codes based on orthogonal meshes are easy to work with and lead to well-posed elliptic and parabolic problems that are comparatively easy to solve. Generally, othogonal mesh representations lead to banded matrices while un… more
Date: January 26, 1998
Creator: Hewwitt, D. W., LLNL
Item Type: Refine your search to only Article
open access

Education Issues in the 105th Congress, 2nd Session

Description: Several education issues are being considered by the 105th Congress. Some of the congressional action results from expiring legislation, such as the Higher Education Act of 1965 (HEA). Other action may occur because of debate over the appropriate federal role in education, including federal support for school reform or national testing. This report provides a brief summary of education issues anticipated for the 2nd Session, as well as a synopsis of education activity during the 1st Session.
Date: January 26, 1998
Creator: Irwin, Paul M.
Item Type: Refine your search to only Report
open access

Evaluation of CZT crystals from the former Soviet Union

Description: Vertical high pressure Bridgman (VHPB) Cd{sub 1{minus}x}Zn{sub x}Te (0.04 < x < 0.24) detector crystals grown in the Ukraine and Russia have been evaluated and compared to US-grown materials. Various analytical techniques were used to study the materials for trace impurities, precipitates, crystallinity, and electrical transport properties. Relatively high concentrations of carbon and trace impurities such as Se, Nd and Si have been detected in the crystals. In most cases, the crystals sh… more
Date: January 26, 1998
Creator: Hermon, H.; Schieber, M.; James, R. B.; Antolak, A. J.; Morse, D. H.; Brunett, B. et al.
Item Type: Refine your search to only Article
open access

Increasing Waterflood Reserves in the Wilmington Oil Field Through Improved Reservoir Characterization and Reservoir Management

Description: The objectives of this quarterly report are to summarize the work conducted under each task during the reporting period October - December 1997 and to report all technical data and findings as specified in the "Federal Assistance Reporting Checklist". The main objective of this project is the transfer of technologies, methodologies, and findings developed and applied in this project to other operators of Slope and Basin Clastic Reservoirs. This project will study methods to identify sands with … more
Date: January 26, 1998
Creator: Phillips, Chris; Moos, Dan; Clarke, Don; Nguyen, John; Tagbor, Kwasi; Koerner, Roy et al.
Item Type: Refine your search to only Report
open access

Linear induction accelerator requirements for ion fast ignition

Description: Fast ignition (fast heating of DT cores afief compression) reduces driver energy (by 10 X or more) by reducing the implosion velocity and energy for a given fuel compression ratio. For any type of driver that can deliver the ignition energy fast enough, fast ignition increases the target gain compared to targets using fast implosions for central ignition, as long as the energy to heat the core after compression is comparable to or less than the slow compression energy, and as long as the coupli… more
Date: January 26, 1998
Creator: Logan, G.
Item Type: Refine your search to only Article
open access

Multi-stage selection catalytic reduction of NO{sub x} in lean burn engine exhaust

Description: Recent studies suggest that the conversion of NO to NO{sub 2} is an important intermediate step in the selective catalytic reduction (SCR) of NO{sub x} to N{sub 2}. These studies have prompted the development of schemes that use an oxidation catalyst to convert NO to NO{sub 2}, followed by a reduction catalyst to convert NO{sub 2} to N{sub 2}. Multi-stage SCR offers high NO{sub x} reduction efficiency from catalysts that, separately, are not very active for reduction of NO, and alleviates the p… more
Date: January 26, 1998
Creator: Penetrante, B.M.; Hsiao, M.O.; Merritt, B.T. & Vogling, E.
Item Type: Refine your search to only Article
open access

NIF Integrated Computer Controls System Description

Description: This System Description introduces the NIF Integrated Computer Control System (ICCS). The architecture is sufficiently abstract to allow the construction of many similar applications from a common framework. As discussed below, over twenty software applications derived from the framework comprise the NIF control system. This document lays the essential foundation for understanding the ICCS architecture. The NIF design effort is motivated by the magnitude of the task. Figure 1 shows a cut-away r… more
Date: January 26, 1998
Creator: VanArsdall, P.
Item Type: Refine your search to only Report
open access

Project management plan, double-shell tank system specification development

Description: The Project Hanford Management Contract (PHMC) members have been tasked by the US Department of Energy (DOE) to support removal of wastes from the Hanford Site 200 Area tanks in two phases. The schedule for these phases allows focusing on requirements for the first phase of providing feed to the privatized vitrification plants. The Tank Waste Retrieval Division near-term goal is to focus on the activities to support Phase 1. These include developing an integrated (technical, schedule, and cost)… more
Date: January 26, 1998
Creator: Conrads, T. J.
Item Type: Refine your search to only Report
open access

Spatial Mapping of Cadmium Zinc Telluride Materials Properties and Electrical Response to Improve Device yield and Performance

Description: Cadmium zinc telluride has experienced tremendous growth in its application to various radiation sensing problems over the last five years. However, there are still issues with yield, particularly of the large volume devices needed for imaging and sensitivity-critical applications. Inhomogeneities of various types and on various length scales currently prevent the fabrication of large devices of high spectral performance. This paper discusses the development of a set of characterization tools f… more
Date: January 26, 1998
Creator: van Scyoc, J. M.; Brunet, B. A.; Yoon, H.; Gilbert, T. S.; Hilton, N. R.; Lund, J. C. et al.
Item Type: Refine your search to only Article
open access

UNSATURATED ZONE CALCITE 813C EVIDENCE OF SOUTHERN NEVADA CLIMATES DURING THE PAST 9 MILLION YEARS

Description: Yucca Mountain, Nevada, is presently the object of intense study as a potential permanent repository for the Nation's high-level radioactive wastes. The mountain consists of a thick sequence of volcanic tuffs in which the depth to the water table ranges from 500 to 700 meters below the land surface. This thick unsaturated zone (UZ), which would host the projected repository, coupled with the present-day arid to semi-arid environment, is considered a positive argument for the site. Evaluation of… more
Date: January 26, 1998
Creator: Whelan, Joseph F. & Moscati, Richard J.
Item Type: Refine your search to only Report
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