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Accuracy of Reservoir Predictions for the Nesjavellir Geothermal Field, Iceland

Description: The performance of the 1986 three-dimensional numerical model of the Nesjavellir geothermal field for predicting the deliverabilities and pressure decline of the wells during the period 1987 through 1991 is investigated. The model predicted adequately the flow rate and enthalpy transients of most wells, but overpredicted the pressure decline by 3 to 4 bars.
Date: January 28, 1993
Creator: Bodvarsson, G. S.; Gislason, G.; Gunnlaugsson, E.; Sigurdsson, O.; Stefansson, V. & Steingrimsson,B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

AMS beyond 2000

Description: The occasion of this conference, the Sixth International Conference on Accelerator Mass Spectrometry, falls sixteen years after the remarkable triple simultaneous discovery of this powerful isotopic measurement. In the interval since the Fifth Conference in Paris in 1991, new facilities of both large and small size have become fully operational, achieving impressive gains in both measurement throughput and precision. The purpose of this short review is to extrapolate from recent gains and exper… more
Date: December 28, 1993
Creator: Davis, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Apparatus and method for two-stage oxidation of wastes

Description: An apparatus and method for oxidizing wastes in a two-stage process. The apparatus includes an oxidation device, a gas-liquid contacting column and an electrocell. In the first stage of the process, wastes are heated in the presence of air to partially oxidize the wastes. The heated wastes produce an off-gas stream containing oxidizable materials. In the second stage, the off-gas stream is cooled and flowed through the contacting column, where the off-gas stream is contacted with an aqueous aci… more
Date: September 28, 1993
Creator: Fleischman, S. D.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Application of mineralogical methods to assess the thermal stabilities of geothermal reservoirs

Description: Estimates of temperatures, past and present, in geothermal reservoirs can be made by using now standard mineralogical techniques, including fluid inclusion geothermometry, vitrinite reflectance, calc-silicate and clay occurrence, the extent of clay interlayering, and measuring clay crystallinity. Recent studies of clays in 60 drillcores from 6 wells at Wairakei, for example, show an inverse relationship between reservoir temperatures and crystallinities from 90° to 225°C (195 to 435°F) … more
Date: January 28, 1993
Creator: Browne, Patrick R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An approach for geochemical assessment of Chipilapa geothermal field

Description: It presents a systematic methodology to evaluate the reservoir characteristics of Chipilapa- Ahuachapan geothermal field through the highly diluted natural manifestations (springs and domestic wells) in its surroundings. The manifestations are classified in three main groups according to their mechanism of formation: high salinity water (HSW), medium salinity water (MSW), and Sulfated Water (SW). The reservoir temperature at Chipilapa geothermal field is around 220°C which is estimated with app… more
Date: January 28, 1993
Creator: Nieva, D.; Verma, M.P.; Portugal, E. & Torres, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

[Bond selective chemistry beyond the adiabatic approximation]

Description: The adiabatic Born-Oppenheimer potential energy surface approximation is not valid for reaction of a wide variety of energetic materials and organic fuels; coupling between electronic states of reacting species plays a key role in determining the selectivity of the chemical reactions induced. This research program initially studies this coupling in (1) selective C-Br bond fission in 1,3- bromoiodopropane, (2) C-S:S-H bond fission branching in CH[sub 3]SH, and (3) competition between bond fissio… more
Date: February 28, 1993
Creator: Butler, Laurie J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Bond selective chemistry beyond the adiabatic approximation]. Technical progress report, September 15, 1992--June 14, 1993

Description: The adiabatic Born-Oppenheimer potential energy surface approximation is not valid for reaction of a wide variety of energetic materials and organic fuels; coupling between electronic states of reacting species plays a key role in determining the selectivity of the chemical reactions induced. This research program initially studies this coupling in (1) selective C-Br bond fission in 1,3- bromoiodopropane, (2) C-S:S-H bond fission branching in CH{sub 3}SH, and (3) competition between bond fissio… more
Date: February 28, 1993
Creator: Butler, Laurie J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bounding estimate of DWPF mercury emissions. Revision 1

Description: Two factors which have substantial impact on predicted Mercury emissions are the air flows in the Chemical Process Cell (CPC) and the exit temperature of the Formic Acid Vent Condenser (FAVC). The discovery in the IDMS (Integrated DWPF Melter System) of H{sub 2} generation by noble metal catalyzed formic acid decomposition and the resultant required dilution air flow has increased the expected instantaneous CPC air flow by as much as a factor of four. In addition, IDMS has experienced higher th… more
Date: October 28, 1993
Creator: Jacobs, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bulalo field, Philippines: Reservoir modeling for prediction of limits to sustainable generation

Description: The Bulalo geothermal field, located in Laguna province, Philippines, supplies 12% of the electricity on the island of Luzon. The first 110 MWe power plant was on line May 1979; current 330 MWe (gross) installed capacity was reached in 1984. Since then, the field has operated at an average plant factor of 76%. The National Power Corporation plans to add 40 MWe base load and 40 MWe standby in 1995. A numerical simulation model for the Bulalo field has been created that matches historic pressure … more
Date: January 28, 1993
Creator: Strobel, Calvin J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
captions transcript

["Clark Sister" gospel concert live performance]

Description: Video footage from The Black Academy of Arts and Letters recorded during the "Clark Sister" live gospel performance held on February 28th, 1993. The footage shows the Grammy Award winning trio of women singing along with a large choir set on risers behind them.
Date: February 28, 1993
Duration: 1 hour 59 minutes 39 seconds
Creator: Clark Sister
Item Type: Refine your search to only Video
Location: 32.774281 -96.797546
Partner: UNT Libraries Special Collections
open access

Combustion synthesis and engineering of nanoparticles for electronic, structural and superconductor applications

Description: Fully dense, nanocrystalline ceramic articles were prepared by the new nanofabrication process. The process consists of two steps: synthesis of ceramic nanoparticles and fabrication of dense, nanocrystalline ceramic parts. The synthesis step produced 10-nanometer-diameter crystallites, and is capable of being scaled up to kilogram/hour production rates. The fabrication step produced dense parts at significantly reduced sintering temperatures and times -- representing a factor of 10--100 reducti… more
Date: May 28, 1993
Creator: Stangle, G.C.; Amarakoon, V.R.W. & Schulze, W.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Combustion synthesis and engineering of nanoparticles for electronic, structural and superconductor applications. Annual progress report, December 1, 1992--May 31, 1993

Description: Fully dense, nanocrystalline ceramic articles were prepared by the new nanofabrication process. The process consists of two steps: synthesis of ceramic nanoparticles and fabrication of dense, nanocrystalline ceramic parts. The synthesis step produced 10-nanometer-diameter crystallites, and is capable of being scaled up to kilogram/hour production rates. The fabrication step produced dense parts at significantly reduced sintering temperatures and times -- representing a factor of 10--100 reducti… more
Date: May 28, 1993
Creator: Stangle, G. C.; Amarakoon, V. R. W. & Schulze, W. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computer-based training system combining virtual reality and multimedia

Description: Training new users of complex machines is often an expensive and time-consuming process. This is particularly true for special purpose systems, such as those frequently encountered in DOE applications. This paper presents a computer-based training system intended as a partial solution to this problem. The system extends the basic virtual reality (VR) training paradigm by adding a multimedia component which may be accessed during interaction with the virtual environment: The 3D model used to cre… more
Date: April 28, 1993
Creator: Stansfield, S. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Core image analysis of matrix porosity in The Geysers reservoir

Description: Adsorption is potentially an important consideration when calculating reserves at The Geysers. Our investigations of the mineralogical relationships in core samples have shown matrix pore spaces to be largely associated with fractures. Dissolution of calcite from hydrothermal veins increases porosity in the graywacke reservoir. The high relative surface area of secondary alteration phases could promote adsorption. In order to quantify porosity distribution and surface area, Scanning Electron Mi… more
Date: January 28, 1993
Creator: Nielson, Dennis L.; Nash, Greg; Hulen, Jeffrey B. & Tripp, Alan C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Correlating quartz dissolution kinetics in pure water from 25{degrees} to 625{degrees}C

Description: A general empirical correlation for estimating the intrinsic dissolution rate of quartz in pure water from 25” to 625°C was presented. Data obtained from five different apparatus in this study correlated favorably to rate measurements reported by seven other research groups using both nominal and BET-determined surface area bases. More than eleven orders of magnitude of variation of dissolution rate occur over a 600°C temperature change exhibiting Arrhenius-like behavior with a global activatio… more
Date: January 28, 1993
Creator: Tester, Jefferson W.; Worley, W. Gabriel; Robiinson, Bruce A.; Grigsby, Charles O. & Feerer, Jeffrey L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Correlation Between Gas Compositions and Physical Phenomena Affecting the Reservoir Fluid in Palinpinon Geothermal Field (Philippines)

Description: Using thermodynamic gas equilibria to calculate temperature and steam fraction in the reservoir, three main physical phenomena due to exploitation of Palinpinon field are identified. 1) Pressure drawdown producing a local increase in the computed steam fraction, with the fluid maintaining high temperature values (close to 300°C). Strong decline in flow rate is observed. 2) Irreversible steam losses from the original high temperature liquid phase during its ascent through fractures in upper zone… more
Date: January 28, 1993
Creator: D'Amore, F.; Nuti, S.; Ruaya, J. R.; Ramos-Candelaria, M.N. & Seastres, J. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Description of work for the 200-UP-1 groundwaters contaminant vertical profiling activity. Revision 1

Description: This description of work (DOW) details the field activities associated with assessing the vertical extent of groundwater contamination in the uppermost unconfined and confined aquifers beneath the southeastern portion of the 200 West area. The document serves as the test plan for those performing the work. It should be used in conjunction with the Remedial Investigation/Feasibility Study Work Plan for the 200-UP-1 Groundwater Operable Unit, Hanford Site, Richland, Washington (200-UP-1 Operable … more
Date: July 28, 1993
Creator: Ford, B. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Detailed three-dimensional modeling of the Botn hydrothermal system in N-Iceland

Description: A detailed three-dimensional numerical model has been developed for the low-temperature hydrothermal system at Botn in Central North Iceland. It is based on a conceptual reservoir model which has evolved during two decades of geothermal research in the area and on the 10 year production history of the system. The model consists of (1) A powerful recharge system at depth, (2) a shallow production reservoir and (3) a cold ground-water system at the surface. About 10 million tons of hot water have… more
Date: January 28, 1993
Creator: Axelsson, Gudni & Bjornsson, Grimur
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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