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Downhole Power Generation and Wireless Communications for Intelligent Completions Applications, Quarterly Report
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Winter Fuels Report
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Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects Quarterly Report
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CO2 Capture by Absorption With Potassium Carbonate Quarterly Report
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Chemical Processing Department Monthly Report
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Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products Quarterly Report
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Development of ITM Oxygen Technology for Integration in IGCC & Other Advanced Power Generation Systems (ITM Oxygen) Progress Report
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Establishment of an Industry-Driven Consortium Focused on Improving the Production Performance of Domestic Stripper Wells Quarterly Report
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ICF quarterly report October-December 1998 volume 8, number 1
This issue of the ICF Quarterly Report focuses on the final section of the 192-arm, 1.8-MJ National Ignition Facility (NIF). We describe both technological advances necessary for optimal utilization of the delivered energy and the hohlraum physics resulting from extremely high energy densities. Two articles belong to the first category. The conversion of infrared light to ultraviolet occurs at the tripler in the NIF's Final Optics Assembly. It is then necessary to separate any unconverted (first- and second-harmonic) light from the tripled-frequency light passed to the target. Large-Aperture Color-Separation Gratings for Diverting Unconverted Light Away from the NIF Target describes the design and fabrication of novel diffraction gratings that fulfill this function. In both direct- and indirect-drive ICF, the symmetry of the capsule as it compresses is crucial. The NIF will have 48 clusters of four beams incident on targets. Optimization of Beam Angles for the National Ignition Facility (p. 15) presents the rationale used to assign beam angles for cylindrical indirect drive while still allowing direct-drive and tetrahedral indirect-drive experiments to be performed.
Date:
September 8, 1998
Creator:
Feit, M
System:
The UNT Digital Library
Development of a catalyst for conversion of syngas-derived materials to isobutylene. Quarterly report No. 7, October 1, 1992--December 31, 1992
The main goal of this contract is to develop a catalyst and technology that will produce iC{sub 4}= directly from coal-derived syngas and that is capable of utilizing a lower (0.5 to 1.0) H{sub 2}:CO ratio. The research will identify and optimize the key catalyst and process characteristics that give improved performance for CO conversion by a non-Fischer-Tropsch process. This report, which is the seventh quarterly report covers the testing of various ZrO{sub 2}-based catalyst systems designed to examine the effects of catalyst preparation and process variables, especially low calcination temperature and mild reaction conditions (low temperatures, low pressure and low space velocity). Testing of solvent-extracted sol-gel ZrO{sub 2} catalysts indicate a decrease in isobutene yield. Lowering the reaction temperature, pressure and space velocity resulted in a small improvement in isobutene yield. Three extended runs demonstrated reasonable catalyst stability. In view of the generally poor isobutene yields, the emphasis in this project will shift to isoalcohol production.
Date:
September 8, 1993
Creator:
Gajda, G.J.
System:
The UNT Digital Library
Effects of inflow on NuMI groundwater concentrations
Recent discussions of the NuMI groundwater problem have been concerned with the effect of inflow of water into the tunnel on the overall groundwater concentration. The purpose of this note is to document calculations of these effects using simple mathematical models. These results can, then, be compared with the results obtained using more elaborate methods such as computer modeling techniques. At Fermilab, a concentration model has been developed to address groundwater activation concerns. While this model has evolved to some degree over time, the main features have remained stable.
Date:
September 8, 1999
Creator:
Cossairt, J. Donald
System:
The UNT Digital Library
Test documentation to convert TWRS baseline data for RDD-100 upgrades
This document describes the test documentation required for converting between different versions of the RDD-100 software application. The area of focus is the successful conversion of the master data set between different versions of the database tool and their corresponding data structures.
Date:
April 8, 1997
Creator:
Gneiting, B.C.
System:
The UNT Digital Library
Non-linear Mode Coupling and Saw-Tooth Instability
Dynamics of the longitudinal relaxation oscillations of a single bunch above the threshold of microwave instability is discussed.
Date:
September 8, 1999
Creator:
Heifets, Samuel A
System:
The UNT Digital Library
New perspectives on the cancer risks of trichloroethylene, its metabolites, and chlorination by-products
Scientific developments in the 1990`s have important implications for the assessment of cancer risks posed by exposures to trichloroethylene (TCE). These new developments include: epidemiological studies; experimental studies of TCE carcinogenicity, metabolism and metabolite carcinogenicity; applications of new physiologically based pharmacokinetic (PBPK) models for TCE; and new pharmacodynamic data obtained for TCE and its rhetabolites. Following a review of previous assessments of TCE carcinogenicity, each of these new sets of developments is summarized. The new epidemiological data do not provide evidence of TCE carcinogenicity in humans, and the new pharmacodynamic data support the hypothesis that TCE carcinogenicity is caused by TCE-induced cytotoxicity. Based on this information, PBPK-based estimates for likely no-adverse effect levels (NOAELs) for human exposures to TCE are calculated to be 16 ppb for TCE in air respired 24 hr/day, and 210 ppb for TCE in drinking water. Cancer risks of zero are predicted for TCE exposures below these calculated NOAELs. For comparison, hypothetical cancer risks posed by lifetime ingestive and multiroute household exposures to TCE in drinking water, at the currently enforced Maximum Contaminant Level (MCL) concentration of 5 ppb are extrapolated from animal bioassay data using a conservative, linear dose-response model. These TCE-related risks are compared …
Date:
December 8, 1994
Creator:
Bogen, K. T.; Slone, T.; Gold, L. S.; Manley, N. & Revzan, K.
System:
The UNT Digital Library
Basin Analysis of the Mississippi Interior Salt Basin and Petroleum System Modeling of the Jurassic Smackover Formation, Eastern Gulf Coastal Plain
The objective is to provide a comprehensive geologic analysis of the Mississippi Interior Salt Basin.
Date:
April 8, 1998
Creator:
Mancini, Ernest A.
System:
The UNT Digital Library
National Ignition Facility start-up/operations engineering and special equipment construction health and safety plan
This document sets forth the responsibilities, interfaces, guidelines, rules, policy, and regulations for all workers involved in the S/O and SE construction, installation, and acceptance testing. This document is enforced from the first day that S/O and SE workers set foot on the NIF construction site until the end of the Project at Critical Decision 4. This document is applicable only to site activities, which are defined as those that occur within the perimeter of the fenced-off NIF construction zone and the Target Chamber Assembly Area (Helipad). The associated Special Equipment laydown and construction support areas listed in Appendix B are not under this plan; their safety provisions are discussed in the Appendix. Prototype and other support activities, such as the Amplifier Laboratory and Frame Assembly Unit assembly area, are not included in this plan. After completion of the Operational Readiness Review, the Facility Safety Procedure, Operational Safety Requirements, and Operational Safety Procedures are the governing safety documents for the operating facility. The S/O and SE project elements are required to implement measures that create a universal awareness of and promote safe job practices at the site. This includes all Lawrence Livermore National Laboratory (LLNL), Los Alamos National Laboratory, Sandia …
Date:
May 8, 1998
Creator:
Huddleston, P. C.
System:
The UNT Digital Library
Engineering task plan TWRS technical baseline completion
The Tank Waste Remediation System (TWRS) includes many activities required to remediate the radioactive waste stored in underground waste storage tanks. These activities include routine monitoring of the waste, facilities maintenance, upgrades to existing equipment, and installation of new equipment necessary to manage, retrieve, process, and dispose of the waste. In order to ensure that these multiple activities are integrated, cost effective, and necessary, a sound technical baseline is required from which all activities can be traced and measured. The process by which this technical baseline is developed will consist of the identification of functions, requirements, architecture, and test (FRAT) methodology. This process must be completed for TWRS to a level that provides the technical basis for all facility/system/component maintenance, upgrades, or new equipment installation.
Date:
March 8, 1996
Creator:
Moore, T. L.
System:
The UNT Digital Library
Logistic Regression Applied to Seismic Discrimination
The usefulness of logistic discrimination was examined in an effort to learn how it performs in a regional seismic setting. Logistic discrimination provides an easily understood method, works with user-defined models and few assumptions about the population distributions, and handles both continuous and discrete data. Seismic event measurements from a data set compiled by Los Alamos National Laboratory (LANL) of Chinese events recorded at station WMQ were used in this demonstration study. PNNL applied logistic regression techniques to the data. All possible combinations of the Lg and Pg measurements were tried, and a best-fit logistic model was created. The best combination of Lg and Pg frequencies for predicting the source of a seismic event (earthquake or explosion) used Lg{sub 3.0-6.0} and Pg{sub 3.0-6.0} as the predictor variables. A cross-validation test was run, which showed that this model was able to correctly predict 99.7% earthquakes and 98.0% explosions for this given data set. Two other models were identified that used Pg and Lg measurements from the 1.5 to 3.0 Hz frequency range. Although these other models did a good job of correctly predicting the earthquakes, they were not as effective at predicting the explosions. Two possible biases were discovered which affect …
Date:
October 8, 1998
Creator:
Amindan, BG & Hagedorn, DN
System:
The UNT Digital Library
Midland Core Repository
None
Date:
November 8, 1999
Creator:
Tyler, Noel
System:
The UNT Digital Library
Development of a coal fired pulse combustor for residential space heating (Phase 1-A). Technical progress report, December 1988--February 1989
A detailed description of the background, technology and application for the development of a coal-fired pulse combustor for residential space heating was provided in the first quarterly report for the period October 1986 - December 1986, That material is omitted from this report. In May of 1988, DOE Contract No. DE-AC22-86PC90278 was modified with the addition of two new Tasks - 1.6 and 13 - as a Phase IA to bridge the gap between Phase I and II of the program. The descriptions of these tasks are now included in Section 1.1. Testing activities during this period were minimal with all effort focused upon resolving the issues associated with the extremely low slurry feed rates required for the unit. The use of a constant pressure slurry feed system followed by a low head peristaltic pump was successful for short periods of time providing the required slurry atomization but exceeded pump design specifications leading to rupture of the peristaltic tube. An attempt was made to locate a commercial pump with the required duty; delivering 1 to 2 gallons per hour at up to 100 psi but could not be located. Design modifications for the peristaltic pump were therefore initiated to meet …
Date:
May 8, 1989
Creator:
unknown
System:
The UNT Digital Library
Direct aromatization of methane. Quarterly technical progress report No. 10, January 1, 1995--March 31, 1995
Further investigations of assisted pyrolysis by the addition of ethane as a free-radical initiator were carried out during this reporting period. The effects of temperature, space velocity, and ethane/methane ratio, in the presence of quench water, have been addressed. As expected, reaction quenching resulted in lower conversions than without quenching, but also in significantly lower yields of {open_quotes}tar-like{close_quotes} products. High C{sub 2}/C{sub 1} ratios and low space velocities result in significant increases in the {open_quotes}tar-like{close_quotes} product yields. Very low ethane concentrations were required to initiate methane pyrolysis at lower temperatures without a major negative effect on product selectivities.
Date:
August 8, 1995
Creator:
unknown
System:
The UNT Digital Library
Audit of subsidized ancillary services at the Nevada Test site
The Department and its contractors have participated in at least six reviews since 1991 encompassing aspects of subsidies at the test site. Several of these reviews resulted in reports recommending reductions to the housing, food, and bus services. A strategic planning report completed in November 1994, for example, recommended closing certain food service facilities, increasing housing rates to fair market value, and studying a bus depot system. Other reports echoed the same themes. The Department should be credited for recognizing that actions should be taken to reduce subsidy costs. Moreover, the Acting Manager, Nevada Operations office, has been proactive in reducing the busing subsidy by decreasing the number of buses and bus routes. The Acting Manager has also been fully supportive of the effort to further reduce subsidies. We appreciate these efforts.
Date:
September 8, 1995
Creator:
unknown
System:
The UNT Digital Library
THE GENERATION OF 400 MW RF PULSES AT X-BAND USING RESONANT DELAY LINES
We present theory and experimental data for a resonant-delay-line pulse-compression system. The system is fed by two high power klystrons at X-band. The output power is four times bigger than the input power. The system produces flat-top output pulses. The system uses evacuated room-temperature copper delay lines as a means of storing energy. These lines achieved a quality factor greater than 4.3 x 10{sup 5}, with total losses due to external components measured at 4%. We compare theory with experimental results.
Date:
March 8, 1999
Creator:
Tantawi, Sami
System:
The UNT Digital Library
Advanced Reservoir Characterization in the Antelope Shale to Establish the Viability of CO2 Enhanced Oil Recovery in California's Monterey Formation Siliceous Shales
The primary objective of this research is to conduct advanced reservoir characterization and modeling studies in the Antelope Shale reservoir. Characterization studies will be used to determine the technical feasibility of implementing a CO2 enhanced oil recovery project in the Antelope Shale in Buena Vista Hills Field. The Buena Vista Hills pilot CO2 project will demonstrate the economic viability and widespread applicability of CO2 flooding in fractured siliceous shale reservoirs of the San Joaquin Valley. The research consists of four primary work processes: (1) Reservoir Matrix and Fluid Characterization; (2) Fracture characterization; (3) reservoir Modeling and Simulation; and (4) CO2 Pilot Flood and Evaluation. Work done in these areas is subdivided into two phases or budget periods. The first phase of the project will focus on the application of a variety of advanced reservoir characterization techniques to determine the production characteristics of the Antelope Shale reservoir. Reservoir models based on the results of the characterization work will be used to evaluate how the reservoir will respond to secondary recovery and EOR processes. The second phase of the project will include the implementation and evaluation of an advanced enhanced oil recovery (EOR) pilot in the United Anticline (West Dome) of the …
Date:
November 8, 1999
Creator:
Morea, Michael F.
System:
The UNT Digital Library
Development of a modular integrated control architecture for flexible manipulators. Final report
In April 1994, ORNL and SPAR completed the joint development of a manipulator controls architecture for flexible structure controls under a CRADA between the two organizations. The CRADA project entailed design and development of a new architecture based upon the Modular Integrated Control Architecture (MICA) previously developed by ORNL. The new architecture, dubbed MICA-II, uses an object-oriented coding philosophy to provide a highly modular and expandable architecture for robotic manipulator control. This architecture can be readily ported to control of many different manipulator systems. The controller also provides a user friendly graphical operator interface and display of many forms of data including system diagnostics. The capabilities of MICA-II were demonstrated during oscillation damping experiments using the Flexible Beam Experimental Test Bed at Hanford.
Date:
December 8, 1994
Creator:
Burks, B.L. & Battiston, G.
System:
The UNT Digital Library
Air Kerma Calibration Factors and kch Values for PTW Soft X-ray, NACP and Roos Ionization Chambers at Very Low X-ray Energies (0.035 mm - 1.0 mm Al HVL)
Several national and international protocols have been established for the dosimetry of x-ray beams used in radiotherapy. For the very low energy x-rays (0.035mm-1.0 mm Al HVL) only two codes are available: the UK IPEMB Code of Practice and the German standard, DIN 6809 Part 4. The measurement of very low energy x-ray beams is normally performed with parallel plate ionization chambers calibrated at a standards laboratory and characterized by an air kerma calibration factor N{sub k}. According to the IPEMB Code of Practice the absorbed dose in the user's beam should be determined by taking measurements with the parallel plate chamber positioned such that its entrance window is at the surface of a full-scatter water equivalent phantom. The absorbed dose to water can then be determined using an equation which includes a factor, k{sub ch}, which accounts for the change in response of the ionization chamber between the calibration in air and measurement at the surface of the phantom. N{sub k} and k{sub ch} values for the PTW soft X-ray, NACP and Roos ionization chambers are reported. It was found that k{sub ch} values varied from about 1.01 to 1.08 depending on the chamber, beam quality and phantom material. …
Date:
July 8, 1999
Creator:
Ipe, Nisy E.
System:
The UNT Digital Library
Modeling of microencapsulated polymer shell solidification
A finite element transport model has been developed and implemented to complement experimental efforts to improve the quality of ICF target shells produced via controlled-mass microencapsulation. The model provides an efficient means to explore the effect of processing variables on the dynamics of shell dimensions, concentricity, and phase behavior. Comparisons with experiments showed that the model successfully predicts the evolution of wall thinning and core/wall density differences. The model was used to efficiently explore and identify initial wall compositions and processing temperatures which resulted in concentricity improvements from 65 to 99%. The evolution of trace amounts of water entering into the shell wall was also tracked in the simulations. Comparisons with phase envelope estimations from modified UNIFAP calculations suggest that the water content trajectory approaches the two-phase region where vacuole formation via microphase separation may occur.
Date:
March 8, 1995
Creator:
Boone, T.; Cheung, L.; Nelson, D.; Soane, D.; Wilemski, G. & Cook, R.
System:
The UNT Digital Library
Orientifolds, RG Flows, and Closed String Tachyons
We discuss the fate of certain tachyonic closed string theories from two perspectives. In both cases our approach involves studying directly configurations with finite negative tree-level cosmological constant. Closed string analogues of orientifolds, which carry negative tension, are argued to represent the minima of the tachyon potential in some cases. In other cases, we make use of the fact, noted in the early string theory literature, that strings can propagate on spaces of subcritical dimension at the expense of introducing a tree-level cosmological constant. The form of the tachyon vertex operator in these cases makes it clear that a subcritical-dimension theory results from tachyon condensation. Using results of Kutasov, we argue that in some Scherk-Schwarz models, for finely-tuned tachyon condensates, a minimal model CFT times a subcritical dimension theory results. In some instances, these two sets of ideas may be related by duality.
Date:
July 8, 1999
Creator:
Kachru, S
System:
The UNT Digital Library
Evaluation of Coupled Precipitator Two
The offline testing of the Coupled Precipitator Two (CP-2) has been completed. The tests were conducted and are documented. The tests were conducted at an offline test rack near the Drain Tube Test Stand facility in 672-T.
Date:
November 8, 1999
Creator:
Stone, M. E.
System:
The UNT Digital Library
Site characterization plan thermal goals reevaluation
The Site Characterization Plan (SCP) (DOE, 1988) attempted to define surrogate criteria that could be used to establish potential repository performance. These criteria or SCP thermal goals were developed from knowledge existing at the time and, as a reference case, emphasized performance for waste emplacement in a vertical borehole. Since that time, new knowledge has become available and some additional analyses of thermal loading have been performed. Additionally, other emplacement modes such as in-drift emplacement are being considered to accommodate larger waste packages. New concepts such as ``extended hot`` are also being considered as possible methods to achieve improved waste isolation. Thus it became clear that the thermal goals established in the SCP should be reevaluated. A Working Group was formed to reassess the SCP thermal goals to determine whether each goal was still valid, if there were goals that needed to be added, and what if any effort was needed to reduce the uncertainty associated with a particular goal. The objectives of the effort were to: (1) provide thermal goals that would support the FY 1993 Thermal Loading Systems Study; (2) help focus the planned testing and analysis efforts; and (3) acquire data that potentially could be used to …
Date:
September 8, 1993
Creator:
unknown
System:
The UNT Digital Library
Productivity and Injectivity of Horizontal Wells
This quarterly report is based on the last activity above. It gives a brief account of the work and the complete study will be included in the next Annual Report of the project.
Date:
November 8, 1999
Creator:
Arababi, Sepehr; Aziz, Khalid; Hayashida, Yasuyuki & Hewett, Thomas
System:
The UNT Digital Library
Determination of the purity of polonium by means of the vacuum balance (Ad Interim Report)
The assay technique is discussed in detail. The results of three purity determinations are: 94.92 per cent, 100.50 per cent, and 106.9 per cent. The errors present in each determination are stated. The inherent dangers in the present procedure are pointed out, and an improved method is outlined.
Date:
March 8, 1949
Creator:
Haring, M. M.
System:
The UNT Digital Library