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Texas Motor Vehicle Traffic Accident Summaries
55
Argonne National Laboratory Reports
34
Fiscal Year 1993
22
United States Geological Survey Reports
18
U.S. Geological Survey bulletin
15
Summary of All Reported Accidents in Rural Areas of Texas
14
Summary of All Reported Accidents in the State of Texas
14
Fiscal Year 1992
13
Texas Real Estate Center Trends
12
Background paper
11
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8,201 Matching Results
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UV laser-surface interactions relevant to analytic spectroscopy of wide bandgap materials
Laer ablation has application in materials analysis, surface modification, and thin film deposition. Processes that lead to emission and formation of particles when wide band gap materials are irradiated with pulsed uv laser light. These materials are often difficult to transport into the gas phase for analysis. Such materials are alkali halides, MgO.
Date:
December 31, 1993
Creator:
Dickinson, J. T.
System:
The UNT Digital Library
Vapor pressures and heats of vaporization of primary coal tars. Quarterly technical progress report, 1 July 1993--30 September 1993
There is significant current interest in general area of coal pyrolysis, particularly with respect to comprehensive models of this complicated phenomenon. This interest derives from the central role of pyrolysis in all thermally driven coal conversion processes -- gasification, combustion, liquefaction, mild gasification, or thermal benefication. There remain several key data needs in these application areas. Among them is a need for more reliable correlation for prediction of vapor pressure of heavy, primary coal tars. Such information is important in design of all coal conversion processes, in which the volatility of tarry products is of major concern. Only very limited correlations exist, and these are not considered reliable to even an order of magnitude when applied to tars. The present project seeks to address this important gap in the near term by direct measurement of vapor pressures of coal tar fractions, by application of well-established techniques and modifications thereof. The principal objectives of the program are to: (1) obtain data on the vapor pressures and heats of vaporization of tars from a range of ranks of coal, (2) develop correlations based on a minimum set of conveniently measurable characteristics of the tars, (3) develop equipment that would allow performing such …
Date:
December 31, 1993
Creator:
Suuberg, E. M.; Oja, V. & Lilly, W. D.
System:
The UNT Digital Library
Vapor pressures and heats of vaporization of primary coal tars. Quarterly technical progress report, 1 October 1993--31 December 1993
The vapor pressure correlations that exist at present for coal tars are very crude and they are not considered reliable to even an order of magnitude when applied to tars. Sophisticated general correlative approaches are slowly being developed, based upon group contribution methods, or based upon some key functional features of the molecules. These are as yet difficult to apply to coal tars. The detailed group contribution methods, in which fairly precise structural information is needed, do not lend themselves well for application to very complex, poorly characterized coal tars. The methods based upon more global types of characterizations have not yet dealt much with the question of oxygenated functional groups. In short, only very limited correlations exist, and these are not considered reliable to even an order of magnitude when applied to tars. The present project seeks to address this important gap in the near term by direct measurement of vapor pressures of coal tar fractions, by application of well-established techniques and modifications thereof. The principal objectives of the program are to: (1) obtain data on the vapor pressures and heats of vaporization of tars from a range of ranks of coal, (2) develop correlations based on a minimum …
Date:
December 31, 1993
Creator:
Suuberg, E. M.
System:
The UNT Digital Library
VHF EPR analysis of organic sulfur in coal. Final technical report, September 1, 1992--August 31, 1993
A direct and non-destructive technique called very High Frequency Electron Paramagnetic Resonance (VHF EPR) utilizing instrumentation and application techniques developed in this laboratory, is proving to be a practical and sensitive analytical method for the organic sulfur in coal. Research during this past year (1992--1993) was very successful in terms of obtaining spectrochemical information on organic sulfur in coal both quantitatively (amount of organic sulfur) and qualitatively (form and distribution of organic sulfur). Starting in this funding year, the authors have begun to develop and use a two-species model (non-exchanging and axially symmetric) for the simulation of VHF EPR coal spectra. Such a model provides quantitative information on the total concentration of sulfur species that can be directly related to the organic sulfur content as measured by conventional chemical methods. Utilizing the newly developed method, they have analyzed the VHF EPR spectra from some sub-bituminous coals containing organic sulfur in the range from 2% to 12% and a number of maceral blends. Excellent quantitative agreement is achieved between VHF EPR results and chemical analyses. In addition, the modelling of VHF EPR spectra of coal provides detailed spectral parameters. These parameters can be related to the molecular structures of the paramagnetic …
Date:
December 31, 1993
Creator:
Clarkson, R. B. & Belford, R. L.
System:
The UNT Digital Library
VHF EPR quantitation and speciation of organic sulfur in coal. Technical report, September 1, 1993--November 30, 1993
Over the last few years, we have developed a non-destructive technique called Very High Frequency Electron Paramagnetic Resonance (VHF-EPR) that is proving to be a practical and very sensitive analytical method for the organic sulfur in coal. Already, although still under development, the technique rapidly can quantify organic sulfur, and perhaps provide information on organic oxygen and nitrogen, in typical Illinois coals. At this stage, the precision is not well enough calibrated, and specificity for particular species needs more development. This year`s proposal outlined a 12 month work plan designed to improve and extend the utility of VHF-EPR. Two main goals of the work are: (1) refinement and calibration of organic sulfur analysis, in coals of differing rank, over a concentration range from 0.1% to 5%, and (2) better utilization of VHF-EPR coal spectral data for sulfur speciation. This quarter, goal (1) is being pursued; results will be ready to describe in a future report. Meanwhile, work toward goal (2) has produced detailed information about the VHF-EPR spectral behavior of several comparison compounds -- sulfur -- containing thiophenic fused-ring molecules.
Date:
December 31, 1993
Creator:
Clarkson, R. B. & Belford, R. L.
System:
The UNT Digital Library
Volatiles combustion in fluidized beds. Quarterly technical progress report, September 4, 1993--December 3, 1993
The goal of this project is to investigate the conditions in which volatiles will burn within both the dense and freeboard regions of fluidized beds. Experiments using a fluidized bed operated at incipient fluidization will be performed to characterize the effect of particle surface area, initial fuel concentration, and particle type on the inhibition of volatiles within a fluidized bed. The work conducted during the period 4 September, 1993 through 3 December, 1993 is reported in this technical progress report. The experimental work during this time period consists primarily of reactor start-up and data collection. Results of stoichiometric combustion of propane in air at three temperatures and a residence time of approximately 3 s are reported. The results of a detailed chemical kinetic model of propane and methane are reported for the theoretical work for this quarter. These results give further evidence that the inhibition of propane and methane combustion is caused by the sand particles.
Date:
December 31, 1993
Creator:
Hesketh, R. P. & Pendergrass, R. A.
System:
The UNT Digital Library
Washability of trace elements in product coals from Illinois mines. Technical report, September 1--November 30, 1993
The existing trace element washability data on Illinois coals are based on float-sink methods, and these data are not applicable to modern froth flotation or column flotation processes. Particularly, there is a lack of washability data on samples from modern preparation plants, as well as other product (as-shipped) coals. The goal of this project is to provide the needed trace element washability data on as-shipped coals that were collected during 1992--1993 from Illinois mines. The results generated by this project will promote Illinois coals for such prospective new markets as feed materials for advanced gasification processes, for synthetic organic chemicals, and to meet new environmental requirements for their use in utility steam generation. During the first quarter, each of 34 project samples were ground to about {approximately}100 mesh size and cleaned by use of a special froth flotation technique (release analysis). The flotation products were analyzed for ash, moisture, and heating value (BTU). The data were then used to construct a series of different-washability curves. For example, these curves can show variation in BTU or combustible recovery as a function of the amount of ash or S rejected, or as a function of the weight of the flotation products. From …
Date:
December 31, 1993
Creator:
Demir, I.; Ruch, R. R.; Harvey, R. D. & Steele, J. D.
System:
The UNT Digital Library
Waste Isolation Pilot Plant annual site environmental report for calendar year 1992
The US Department of Energy (DOE) Waste Isolation Pilot Plant (WIPP) Operational Environmental Monitoring Plan (OEMP) defined a comprehensive set of parameters which are monitored to detect potential environmental impacts and establish baselines for future environmental evaluations. Surface water and groundwater, air, soil, and biotics are monitored for radioactivity levels. Nonradiological environmental monitoring activities include air, water quality, soil properties, meteorological measurements and determination of the status of the local biological community. Ecological studies focus on the immediate area surrounding the WIPP site with emphasis on the salt storage pile. The baseline radiological surveillance covers a broader geographic area including nearby ranches, villages, and cities. Since the WIPP is still in its preoperational phase (i.e., no waste has been received) certain operational requirements of DOE Orders 5400.1, 5400.5, and the Environmental Regulatory Guide for Radiological Effluent Monitoring and Environmental Surveillance (DOE/EH-0173T) are not relevant. Therefore, this report does not discuss items such as radionuclide emissions and effluents and subsequent doses to the public.
Date:
December 31, 1993
Creator:
unknown
System:
The UNT Digital Library
Waste Isolation Pilot Plant Groundwater Protection Management Program Plan
The DOE has mandated in DOE Order 5400.1 that its operations will be conducted in an environmentally safe manner. The Waste Isolation Pilot Plant (WIPP) will comply with DOE Order 5400.1 and will conduct its operations in a manner that ensures the safety of the environment and the public. This document outlines how the WIPP will protect and preserve groundwater within and surrounding the WIPP facility. Groundwater protection is just one aspect of the WIPP environmental protection effort. The WIPP groundwater surveillance program is designed to determine statistically if any changes are occurring in groundwater characteristics within and surrounding the WIPP facility. If a change is noted, the cause will be determined and appropriate corrective action initiated.
Date:
December 31, 1993
Creator:
unknown
System:
The UNT Digital Library
Waste minimization opportunities at the U.S. Uranium Mill Tailings Remedial Action (UMTRA) Project, Rifle, Colorado, site
At two uranium mill sites in Rifle, Colorado, the US Department of Energy (DOE) Uranium Mill Tailings Remedial Action (UMTRA) Project is removing uranium mill tailings and contaminated subgrade soils. This remediation activity will result in the production of groundwater contaminated with uranium, heavy metals, ammonia, sulfates, and total dissolved solids (TDS). The initial remediation plan called for a wastewater treatment plant for removal of the uranium, heavy metals, and ammonia, with disposal of the treated water, which still includes the sulfates and TDSS, to the Colorado River. The National Pollutant Discharge Elimination (NPDES) permit issued by the Colorado Department of Health for the two Rifle sites contained more restrictive discharge limits than originally anticipated. During the detailed review of alternate treatment systems to meet these more restrictive limits, the proposed construction procedures were reviewed emphasizing the methods to minimize groundwater production to reduce the size of the water treatment facility, or to eliminate it entirely. It was determined that with changes to the excavation procedures and use of the contaminated groundwater for use in dust suppression at the disposal site, discharge to the river could be eliminated completely.
Date:
December 31, 1993
Creator:
Hartmann, George L.; Arp, Sharon & Hempill, Hugh
System:
The UNT Digital Library
Water-quality data for the Missouri River and Missouri River alluvium near Weldon Spring, St. Charles County, Missouri, 1991--92
This report contains the water-quality data collected at two cross sections across the Missouri River and from monitoring wells in the Missouri River alluvium near Defiance, Missouri. The sampling results indicate the general water composition from the Missouri River changes with different flow conditions. During low-base flow conditions, the water generally contained about equal quantities of calcium and sodium plus potassium and similar quantities of bicarbonate and sulfate. During high-base flow conditions, water from the river predominantly was a calcium bicarbonate type. During runoff conditions, the water from the river was a calcium bicarbonate type, and sulfate concentrations were larger than during high-base flow conditions but smaller than during low-base flow conditions. The total and dissolved uranium concentrations at both the upstream and downstream cross sections, as well as from the different vertical samples across the river, were similar during each sampling event. However, sodium, sulfate, nitrate, and total and dissolved uranium concentrations varied with different flow conditions. Sodium and sulfate concentrations were larger during low-base flow conditions than during high-base flow or runoff conditions, while nitrate concentrations decreased during low-base flow conditions. Both total and dissolved uranium concentrations were slightly larger during runoff events than during low-base or high-base …
Date:
December 31, 1993
Creator:
Kleeschulte, M. J.
System:
The UNT Digital Library
Western Research Institute quarterly technical progress report, July--September 1993
Accomplishments for the quarter are described briefly for the following areas of research: oil shale; tar sand; coal; advanced exploratory process technology; and jointly sponsored research. Oil shale research covers process studies. Tar sand research is on recycle oil pyrolysis and extraction (ROPE{sup TM}) Process. Coal research includes: coal combustion; integrated coal processing concepts; and solid waste management. Advanced exploratory process technology includes: advanced process concepts; advanced mitigation concepts; and oil and gas technology. Jointly sponsored research covers: CROW{sup TM} field demonstration with Bell Lumber and Pole; operation and evaluation of the CO{sub 2} HUFF-N-PUFF Process; fly ash binder for unsurfaced road aggregates; solid state NMR analysis of Mesaverde group, Greater Green River Basin, tight gas sands; characterization of petroleum residua; shallow oil production using horizontal wells with enhanced oil recovery techniques; surface process study for oil recovery using a thermal extraction process; oil field waste cleanup using tank bottom recovery process; remote chemical sensor development; in situ treatment of manufactured gas plant contaminated soils demonstration program; solid state NMR analysis of Mowry formation shale from different sedimentary basins; solid state NMR analysis of naturally and artificially matured kerogens; and development of an effective method for the clean-up of natural …
Date:
December 31, 1993
Creator:
unknown
System:
The UNT Digital Library
Workshop on advances in smooth particle hydrodynamics
This proceedings contains viewgraphs presented at the 1993 workshop held at Los Alamos National Laboratory. Discussed topics include: negative stress, reactive flow calculations, interface problems, boundaries and interfaces, energy conservation in viscous flows, linked penetration calculations, stability and consistency of the SPH method, instabilities, wall heating and conservative smoothing, tensors, tidal disruption of stars, breaking the 10,000,000 particle limit, modelling relativistic collapse, SPH without H, relativistic KSPH avoidance of velocity based kernels, tidal compression and disruption of stars near a supermassive rotation black hole, and finally relativistic SPH viscosity and energy.
Date:
December 31, 1993
Creator:
Wingate, C. A. & Miller, W. A.
System:
The UNT Digital Library
WRAP 2A Waste Form Qualification Plan
WRAP Module 2A is a facility that will serve to treat retrieved, stored, and newly generated contact-handled mixed low level waste (MLLW) at the Department of Energy`s Hanford site near Richland, Washington. The treatment processes to be used are limited to non-thermal processes, defined as processes operating at a temperature less than 500{degree}F. In addition to waste pretreatment and conditioning processes including sorting, size reduction, and homogenization, the final treatment technologies will consist of immobilization, stabilization, and encapsulation to produce final waste forms that are suitable for disposal in compliance with all applicable regulatory requirements. The wide variety of chemical and physical characteristics exhibited by the WRAP 2A feed streams will necessitate the performance of a comprehensive waste form qualification (WFQ) testing program. The WFQ program will provide the technical basis supporting the process selection and will demonstrate that the selected treatment processes produce final waste forms that will meet all applicable regulatory requirements and performance specifications. This document describes the overall WRAP 2A WFQ program.
Date:
December 31, 1993
Creator:
Burbank, D. A. Jr.
System:
The UNT Digital Library
Y-12 development organization technical progress report period ending December 1, 1993. Part 3, Metal processing
Rheocasting is a method to eliminate skull and arc melting from the uranium-6% niobium alloy production stream. A U-6Nb ingot was melted and stirred in the rheocasting furnace.
Date:
December 31, 1993
Creator:
Northcutt, W. G. Jr.
System:
The UNT Digital Library
The yield of F-18 from different target designs in the {sup 18}O(p,n){sup 18}F reaction on frozen [{sup 18}O]CO{sub 2}
The shortage of oxygen-18 enriched water has encouraged the authors to explore alternate methods of production of fluorine-18 where the recovery of the oxygen-18 enriched target material is extremely efficient. They have recently presented the results from a cryogenic target using carbon dioxide ice as the target. This is similar in design to a water ice target previously described. The amount of material required and the maximum beam current which can be put on the target are a function of the particular design. The effects of target cone length and number of cooling fins have been explored in order to optimize the target design. Three different targets have been used to test these parameters. The three targets are shown. The first was the prototype target with a single heat sink at the rear of the target. The second is a target with several cooling fins and a short cone length which requires less target material. The third is a target with several cooling fins but a longer target length which allows for more efficient cooling of the material. The results from these studies are summarized. This cryogenic target gives extremely efficient enriched target material recovery (>99%) and simplicity of material …
Date:
December 31, 1993
Creator:
Firouzbakht, M. L.; Schlyer, D. J. & Wolf, A. P.
System:
The UNT Digital Library
Yucca Mountain Site Characterization Project Technical Data Catalog (Quarterly supplement)
The March 21, 1993, Department of Energy (DOE)/Nuclear Regulatory Commission (NRC) Site-Specific Procedural Agreement for Geologic Repository Site Investigation and Characterization Program requires the DOE to develop and maintain a catalog of data which will be updated and provided to the NRC at least quarterly. This catalog is to include a description of the data; the time (date), place, and method of acquisition; and where it may be examined. The Yucca Mountain Site Characterization Project (YMP) Technical Data Catalog is published and distributed in accordance with the requirements of the Site-Specific Agreement. The YMP Technical Data Catalog is a report based on reference information contained in the YMP Automated Technical Data Tracking System (ATDT). The reference information is provided by Participants for data acquired or developed in support of the YMP. The Technical Data Catalog is updated quarterly and published in the month following the end of each quarter. A complete revision to the Catalog is published at the end of each fiscal year. Supplements to the end-of-year edition are published each quarter. These supplements provide information related to new data items not included in previous quarterly updates and data items affected by changes to previously published reference information. The …
Date:
December 31, 1993
Creator:
unknown
System:
The UNT Digital Library