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37,337 Matching Results
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Sulfur isotope ratio technique
None
Date:
January 1, 1974
Creator:
Castleman, A. W., Jr. & Munkelwitz, H. R.
System:
The UNT Digital Library
(Clusters: Elucidating the dynamics of ionization events and ensuing reactions in the condensed phase)
New insight into a variety of phenomena of interest in liquids have been derived from recent studies in our laboratory. In particular, new findings have contributed to identifying the structure of protonated complexes among species of varying proton affinities, and quantifying the variations in spectroscopic properties of chromophores as influenced by solvation and aggregation. 17 refs.
Date:
January 1, 1991
Creator:
Castleman, A. W., Jr.
System:
The UNT Digital Library
[Studies of the formation chemical reactivity and properties of small clusters application to an understanding of aerosol formation and heterogeneous chemistry]
Chemical reactions that proceed following either a photophysical or ionizing event, are directly influenced by the mechanisms of energy transfer and dissipation away from the primary site of absorption. Neighboring solvent or solute molecules can affect this by collisional deactivation (removal of energy), through effects in which dissociating molecules are kept in relatively close proximity for comparatively long periods of time due to the presence of the solvent, and in other ways where the solvent influences the energetics of the reaction coordinate. Research on clusters offers one of the most viable ways of elucidating the molecular details of these processes. The current program is comprised of three general areas of research. Investigation of the dynamics of ionization and the mechanisms of the early-time reactions following the interaction of ionizing electromagnetic radiation with matter; measurement of the kinetics of ensuing ion reactions with effort focused on the influence of solvation effects and identifying similarities and differences between gas and condensed phase reactions; and determination of the structure of solvated reaction centers via spectroscopy, dynamics and thermochemistry.
Date:
January 1, 1992
Creator:
Castleman, A. W., Jr.
System:
The UNT Digital Library
Occupational safety and health training program at ETCs. Interim status report
Preliminary studies reveal that serious deficiencies exist in occupational safety and health training programs within DOE's fossil fuel programs. The basic requirements of Executive Order 12196, 29 CFR 1960 (both earlier and current versions) and Chapter III, ASFE 5480.1 are not being addressed in an adequate fashion. The principal deficiencies are a lack of sufficient funding for both employee and safety and health staff training, and inadequate or non-existent documentation of training for top management, intermediate levels of management, and supervisors. Similar deficiencies exist in varying degrees for other employees. It is apparent that the full extent of the training requirements in OSHA 29 CFR 1910 standards has not been recognized and implemented within the ETCs.
Date:
January 1, 1981
Creator:
Meyer, A. F., Jr.; Vaudreuil, M. & Wisniewski, S. T.
System:
The UNT Digital Library
Theoretical Evaluation of Consumer Products from Project Gasbuggy, Final Report. Phase II: Hypothetical Population Exposures Outside San Juan Basin
None
Date:
January 1, 1972
Creator:
Jacobs, D. G.; Barton, C. J.; Kelly, M. J.; Bowman, C. R.; Hanna, S. R.; Gifford, F. A., Jr. et al.
System:
The UNT Digital Library
Geochemical behavior of the second hot dry rock geothermal reservoir at Fenton Hill, New Mexico
The results of three major heat-extraction experiments conducted in two hot dry geothermal reservoirs indicate that the field chemistry is largely influenced by the interstitial fluid contained in the reservoir rock. This fluid is slowly removed by the circulation of relatively fresh water through the fracture systems until the level of dissolved species is ultimately fixed by rock-water equilibrium. Because the sodium and potassium observed in the system were contributed by the pore-fluid, the Na-K-Ca geothermometer was insensitive to changes in the rock temperatures. The quartz geothermometer does reflect the changes in reservoir temperature, however the concentraton of silica in solution must be adjusted for the effect of mixing of small amounts of silica-saturated pore-fluid with fluid which has passed through the main flow path. When the pore-fluid contribution is subtracted, the resulting concentration of silica in the produced fluid can be modeled with a kinetic model to determine the actual temperature of the reservoir rock.
Date:
January 1, 1980
Creator:
Grigsby, C. O.; Trujillo, P. E., Jr.; Counce, D. A. & Aguilar, R. G.
System:
The UNT Digital Library
Advanced Technologies for Stripper Gas Well Enhancement
As part of Task 1 in the Advanced Technologies for Stripper Gas Well Enhancement, Schlumberger--Holditch Reservoir Technologies (H-RT) has partnered with two Appalachian Basin producers, Great Lakes Energy (formerly Range Resources) and Belden and Blake Corporation, to develop methodologies for the identification and enhancement of stripper wells with economic upside potential. These industry partners have provided data for over 700 wells in northwestern Pennsylvania. Phase 1 goals of this project are to develop and validate methodologies that can quickly and cost-effectively identify wells with enhancement potential. We are currently in the final stages of developing and testing our new Access/Excel based software and processing this well data to generate a list of potential candidate wells that can be used in Phase 2 to validate these methodologies. Preparation of the Final Technical report has begun.
Date:
January 1, 2001
Creator:
Boyer, C. M., II; Fairchild, N. R., Jr. & P.G., R.J. MacDonald
System:
The UNT Digital Library
Materials selection guidelines for geothermal energy utilization systems
This manual includes geothermal fluid chemistry, corrosion test data, and materials operating experience. Systems using geothermal energy in El Salvador, Iceland, Italy, Japan, Mexico, New Zealand, and the United States are described. The manual provides materials selection guidelines for surface equipment of future geothermal energy systems. The key chemical species that are significant in determining corrosiveness of geothermal fluids are identified. The utilization modes of geothermal energy are defined as well as the various physical fluid parameters that affect corrosiveness. Both detailed and summarized results of materials performance tests and applicable operating experiences from forty sites throughout the world are presented. The application of various non-metal materials in geothermal environments are discussed. Included in appendices are: corrosion behavior of specific alloy classes in geothermal fluids, corrosion in seawater desalination plants, worldwide geothermal power production, DOE-sponsored utilization projects, plant availability, relative costs of alloys, and composition of alloys. (MHR)
Date:
January 1, 1981
Creator:
Ellis, P. F., II & Conover, M. F.
System:
The UNT Digital Library
Geologic Characterization of Young Alluvial Basin-Fill Deposits from Drill Hole Data in Yucca Flat, Nye County, Nevada.
Yucca Flat is a topographic and structural basin in the northeastern part of the Nevada Test Site (NTS) in Nye County, Nevada, that has been the site of numerous underground nuclear tests; many of these tests occurred within the young alluvial basin-fill deposits. The migration of radionuclides to the Paleozoic carbonate aquifer involves passage through this thick, heterogeneous section of Tertiary and Quaternary rock. An understanding of the lateral and vertical changes in the material properties of young alluvial basin-fill deposits will aid in the further development of the hydrogeologic framework and the delineation of hydrostratigraphic units and hydraulic properties required for simulating ground-water flow in the Yucca Flat area. This report by the U.S. Geological Survey, in cooperation with the U.S. Department of Energy, presents data and interpretation regarding the three-dimensional variability of the shallow alluvial aquifers in areas of testing at Yucca Flat, data that are potentially useful in the understanding of the subsurface flow system. This report includes a summary and interpretation of alluvial basin-fill stratigraphy in the Yucca Flat area based on drill hole data from 285 selected drill holes. Spatial variations in lithology and grain size of the Neogene basin-fill sediments can be established when …
Date:
January 22, 2007
Creator:
Sweetkind, Donald S. & Drake, Ronald M., II
System:
The UNT Digital Library
ETOE-2/MC/sup 2/-2/SDX multigroup cross-section processing
The ETOE-2/MC/sup 2/-2/SDX multigroup cross-section processing codes were designed to provide a comprehensive neutron cross-section processing capability for a wide range of applications including critical experiment analysis and core design calculations. Fundamental nuclear data from ENDF/B provide the primary input to the code system, and the output consists of a user-specified CCCC ISOTXS multigroup cross-section data file. Great flexibility is provided to the user in specifying the rigor of the calculation, so that a unified cross-section processing system with a single data base which may be used for both preliminary survey scoping studies and rigorous design calculations is available. The principal program blocks of the code system include a library processor and format converter between ENDF/B data and the MC/sup 2/-2/SDX library; an ultra-fine-group fundamental-mode calculation (MC/sup 2/-2) which provides a composition-dependent spectrum calculation and broad-group collapsing capability; a rigorous hyper-fine-group, spatially hetegeneous resolved resonance calculation (RABANL) to supplement the more approximate NR approximation used in the ultra-fine-group treatment; and an intermediate group space-dependent capability (SDX). 5 figures, 4 tables.
Date:
January 1, 1978
Creator:
Toppel, B. J.; Henryson, H., II & Stenberg, C. G.
System:
The UNT Digital Library
Environmentally Benign Mitigation of Microbiologically Influenced Corrosion (MIC)
The overall program objective is to develop and evaluate environmentally benign agents or products that are effective in the prevention, inhibition, and mitigation of microbially influenced corrosion (MIC) in the internal surfaces of metallic natural gas pipelines. The goal is to develop one or more environmentally benign (a.k.a. ''green'') products that can be applied to maintain the structure and dependability of the natural gas infrastructure. The technical approach for this quarter included the fractionation of extracts prepared from several varieties of pepper plants, and using several solvents, by high performance liquid chromatography (HPLC). A preliminary determination of antimicrobial activities of the new extracts and fractions using a growth inhibition assay, and evaluation of the extracts ability to inhibit biofilm formation was also performed. The analysis of multiple extracts of pepper plants and fractions of extracts of pepper plants obtained by HPLC illustrated that these extracts and fractions are extremely complex mixtures of chemicals. Gas chromatography-mass spectrometry was used to identify the chemical constituents of these extracts and fractions to the greatest degree possible. Analysis of the chemical composition of various extracts of pepper plants has illustrated the complexity of the chemical mixtures present, and while additional work will be performed …
Date:
January 31, 2004
Creator:
Kilbane, John J., II & Bogan, William
System:
The UNT Digital Library
Iran: U.S. Concerns and Policy Responses
This CRS Report for Congress contains descriptions of U.S. policy response, legislation, and sanctions pertaining to Iran. Updated January 30, 2008.
Date:
January 30, 2008
Creator:
Katzman, Kenneth
System:
The UNT Digital Library
Iraq: Politics, Elections, and Benchmarks
This Congressional Research Report for Congress details elections and constitutional referendum pertaining to Iraq.
Date:
January 2, 2009
Creator:
Katzman, Kenneth
System:
The UNT Digital Library
U.S. Food and Agricultural Imports: Safeguards and Selected Issues
None
Date:
January 2, 2008
Creator:
Becker, Geoffrey S.
System:
The UNT Digital Library
The Role of Local Food Systems in U.S. Farm Policy
None
Date:
January 20, 2012
Creator:
Johnson, Renée; Cowan, Tadlock & Aussenberg, Randy Alison
System:
The UNT Digital Library
Social Security: Calculation and History of Taxing Benefits
None
Date:
January 14, 2005
Creator:
Scott, Christine
System:
The UNT Digital Library
Social Security: Calculation and History of Taxing Benefits
None
Date:
January 15, 2010
Creator:
Scott, Christine & Mulvey, Janemarie
System:
The UNT Digital Library
U.S. Assistance to the Former Soviet Union 1991-2001: A History of Administration and Congressional Action
None
Date:
January 15, 2002
Creator:
Tarnoff, Curt
System:
The UNT Digital Library
Mental Disorders Among OEF/OIF Veterans Using VA Health Care: Facts and Figures
None
Date:
January 11, 2013
Creator:
Bagalman, Erin
System:
The UNT Digital Library
International Food Aid and the 2007 Farm Bill
This report discusses the reauthorization of United States food aid programs by Congress as part of the 2007 farm bill. This includes past international and domestic applications of food aid, its issues, and congressional action.
Date:
January 25, 2008
Creator:
Hanrahan, Charles E.
System:
The UNT Digital Library
Military Health Care: The Issue of “Promised” Benefits
None
Date:
January 16, 2001
Creator:
Burrelli, David F.
System:
The UNT Digital Library
Trafficking in Persons: International Dimensions and Foreign Policy Issues for Congress
None
Date:
January 9, 2013
Creator:
Wyler, Liana S.
System:
The UNT Digital Library
[Interim Review of Reports]: Wallisville Reservoir Trinity River, Texas
Report of the U.S. Army Engineers describing the geography of the mouth of the Trinity River and Anahuac Channel including the likelihood of floods and benefits of flood control, as well as proposals to adjust the Wallisville Reservoir and to create a nearby national wildlife refuge.
Date:
January 9, 1962
Creator:
United States. Department of the Army. Office, Chief of Engineers.
System:
The Portal to Texas History
Evaluation of Foreign Multiplier Phototubes
"Several multiplier phototubes produced by England, Russia, or Switzerland were evaluated for amplification, photocathode sensitivity, photo-electron collection efficiency, cathode uniformity, and dark current. A description of the various tubes by designation numbers is given, along nth a description of techniques and equipment used in testing."
Date:
January 1, 1958
Creator:
Bolakas, J. & Parker, P G.
System:
The UNT Digital Library