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3-D UNSTRUCTURED HEXAHEDRAL-MESH Sn TRANSPORT METHODS
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). We have developed a method for solving the neutral-particle transport equation on 3-D unstructured hexahedral meshes using a S{sub n} discretization in angle in conjunction with a discontinuous finite-element discretization in space and a multigroup discretization in energy. Previous methods for solving this equation in 3-D have been limited to rectangular meshes. The unstructured-mesh method that we have developed is far more efficient for solving problems with complex 3-D geometric features than rectangular-mesh methods. In spite of having to make several compromises in our spatial discretization technique and our iterative solution technique, our method has been found to be both accurate and efficient for a broad class of problems.
Date:
November 1, 2000
Creator:
Morel, J. & McGhee, J.
Object Type:
Report
System:
The UNT Digital Library
5.2 mW Single-Mode Power from a Coupled-Resonator Vertical-Cavity Laser
None
Date:
November 28, 2000
Creator:
Fischer, A. J.; Choquette, K. D.; Chow, W. W.; Allerman, A. A. & Geib, K. M.
Object Type:
Article
System:
The UNT Digital Library
13th Annual Meeting of the ALS Users' Association
A complement of 266 users, staff, and vendors descended upon the Ernest Orlando Lawrence Berkeley National Laboratory (Berkeley Lab) from Monday through Wednesday, October 16-18, 2000 for the thirteenth edition of the annual Advanced Light Source (ALS) users meeting. In a departure from previous practice, the meeting featured an increased emphasis on workshops with the result that the proceedings were equally divided between oral and poster presentations and the workshops. After the traditional welcomes and facility updates on the first morning, science dominated the first day and a half comprising the formal meeting with a session of highlights from young researchers, three sessions of scientific highlights from the ALS and elsewhere, and a poster session that included a student poster competition. A set of seven workshops covering research areas of current or growing interest at the ALS rounded out the final day and a half of the meeting.
Date:
November 21, 2000
Creator:
Robinson, Art
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 30, No. 8, Ed. 1 Friday, November 3, 2000
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 3, 2000
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 30, No. 9, Ed. 1 Friday, November 10, 2000
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 10, 2000
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 30, No. 10, Ed. 1 Friday, November 17, 2000
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 17, 2000
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2020 Vision Project Summary
Since the 2020 Vision project began in 1996, students from participating schools have completed and submitted a variety of scenarios describing potential world and regional conditions in the year 2020 and their possible effect on US national security. This report summarizes the students' views and describes trends observed over the course of the 2020 Vision project's five years. It also highlights the main organizational features of the project. An analysis of thematic trends among the scenarios showed interesting shifts in students' thinking, particularly in their views of computer technology, US relations with China, and globalization. In 1996, most students perceived computer technology as highly beneficial to society, but as the year 2000 approached, this technology was viewed with fear and suspicion, even personified as a malicious, uncontrollable being. Yet, after New Year's passed with little disruption, students generally again perceived computer technology as beneficial. Also in 1996, students tended to see US relations with China as potentially positive, with economic interaction proving favorable to both countries. By 2000, this view had transformed into a perception of China emerging as the US' main rival and ''enemy'' in the global geopolitical realm. Regarding globalization, students in the first two years of the …
Date:
November 1, 2000
Creator:
Gordon, K. W. & Scott, K. P.
Object Type:
Report
System:
The UNT Digital Library
Ablation Front Rayleigh Taylor Dispersion Curve in Indirect Drive
The Rayleigh-Taylor (RT) instability, which occurs when a lower-density fluid accelerates a higher-density layer, is common in nature. At an ablation front a sharp reduction in the growth rate of the instability at short wave-lengths can occur, in marked contrast to the classical case where growth rates are highest at the shortest wavelengths. Theoretical and numerical investigations of the ablative RT instability are numerous and differ considerably on the level of stabilization expected. We present here the results of a series of laser experiments designed to probe the roll-over and cutoff region of the ablation-front RT dispersion curve in indirect drive. Aluminum foils with imposed sinusoidal perturbations ranging in wavelength from 10 to 70 pm were ablatively accelerated with a radiation drive generated in a gold cylindrical hohlraum. A strong shock wave compresses the package followed by an {approx}2 ns period of roughly constant acceleration and the experiment is diagnosed via face-on radiography. Perturbations with wavelengths {ge} 20 {micro}m experienced substantial growth during the acceleration phase while shorter wavelengths showed a sharp drop off in overall growth. These experimental results compared favorably to calculations with a 2-D radiation-hydrodynamics code, however, the growth is significantly affected by the rippled shock launched …
Date:
November 17, 2000
Creator:
Budil, K. S.; Lasinski, B.; Edwards, M. J.; Wan, A. S.; Remington, B. A.; Weber, S. V. et al.
Object Type:
Article
System:
The UNT Digital Library
ACCELERATOR TRANSMUTATION OF WASTE TECHNOLOGY AND IMPLEMENTATION SCENARIOS
During 1999, the U.S. Department of Energy, in conjunction with its nuclear laboratories, a national steering committee, and a panel of world experts, developed a roadmap for research, development, demonstration, and deployment of Accelerator-driven Transmutation of Waste (ATW). The ATW concept that was examined in this roadmap study was based on that developed at the Los Alamos National Laboratory (LANL) during the 1990s. The reference deployment scenario in the Roadmap was developed to treat 86,300 tn (metric tonnes initial heavy metal) of spent nuclear fuel that will accumulate through 2035 from existing U.S. nuclear power plants (without license extensions). The disposition of this spent nuclear reactor fuel is an issue of national importance, as is disposition of spent fuel in other nations. The U.S. program for the disposition of this once-through fuel is focused to characterize a candidate site at Yucca Mountain, Nevada for a geological repository for spent fuel and high-level waste. The ATW concept is being examined in the U.S. because removal of plutonium minor actinides, and two very long-lived isotopes from the spent fuel can achieve some important objectives. These objectives include near-elimination of plutonium, reduction of the inventory and mobility of long-lived radionuclides in the repository, …
Date:
November 1, 2000
Creator:
BELLER, D. & TUYLE, G. VAN
Object Type:
Article
System:
The UNT Digital Library
Accurate Time-Linked Data Acqusition System Field Deploymemt and Operational Experience
None
Date:
November 15, 2000
Creator:
BERG,DALE E. & ZAYAS,JOSE R.
Object Type:
Article
System:
The UNT Digital Library
ACHIEVING THE REQUIRED COOLANT FLOW DISTRIBUTION FOR THE ACCELERATOR PRODUCTION OF TRITIUM (APT) TUNGSTEN NEUTRON SOURCE
The Accelerator Production of Tritium neutron source consists of clad tungsten targets, which are concentric cylinders with a center rod. These targets are arranged in a matrix of tubes, producing a large number of parallel coolant paths. The coolant flow required to meet thermal-hydraulic design criteria varies with location. This paper describes the work performed to ensure an adequate coolant flow for each target for normal operation and residual heat-removal conditions.
Date:
November 1, 2000
Creator:
SIEBE, D. & PASAMEHMETOGLU, K.
Object Type:
Article
System:
The UNT Digital Library
Actinide Molecular Science: F-Electronic Structure in Synthesis, Spectroscopy, and Computation
This report focuses on the understanding of the relative roles of 5f/6d electronics on chemical bonding the relative roles of the iconic and covalent behaviors and polar and nonpolar solvents in controlling actinide chemical reactivity.
Date:
November 1, 2000
Creator:
Berg, J.; Burns, C. & Al, Et
Object Type:
Report
System:
The UNT Digital Library
Active Feedback Stabilization of the Resistive Wall Mode on the DIII-D Device
A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
Date:
November 1, 2000
Creator:
Okabayashi, M; Bialek, J; Chance, M S; Chu, M S; Fredrickson, E D; Garofalo, A M et al.
Object Type:
Article
System:
The UNT Digital Library
ACTIVE FEEDBACK STABILZATION OF THE RESISTIVE WALL MODE ON THE DIII-D DEVICE
A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. and Contr. Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
Date:
November 1, 2000
Creator:
Okabayashi, M.; Bialek, J.; Chance, M. S.; Chu, M. S.; Fredrickson, E. D.; Garofalo, A. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Activities of the Texas Groundwater Protection Committee: Report to the 77th Legislature
A report which summarizes the activities for the preceding two years and provides recommendations to improve groundwater protection.
Date:
November 2000
Creator:
Texas Groundwater Protection Committee
Object Type:
Report
System:
The Portal to Texas History
Adaptive Optics Survey for Companions to stars with Extra-Solar Planets
We have undertaken an adaptive optics imaging survey of extrasolar planetary systems and stars showing interesting radial velocity trends from high precision radial velocity searches. Adaptive Optics increases the resolution and dynamic range of an image, substantially improving the detectability of faint close companions. This survey is sensitive to objects less luminous than the bottom of the main sequence at separations as close as 1 inch. We have detected stellar companions to the planet bearing stars HD 114762 and Tau Boo. We have also detected a companion to the non-planet bearing star 16 Cyg A.
Date:
November 27, 2000
Creator:
Lloyd, J. P.; Liu, M. C.; Graham, J. R.; Enoch, M.; Kalas, P.; Marcy, G. W. et al.
Object Type:
Article
System:
The UNT Digital Library
An Adaptive Optics Survey for Companions to Stars with Extra-Solar Planets
We have undertaken an adaptive optics imaging survey of extrasolar planetary systems and stars showing interesting radial velocity trends from high precision radial velocity searches. Adaptive Optics increases the resolution and dynamic range of an image, substantially improving the detectability of faint close companions. This survey is sensitive to objects less luminous than the bottom of the main sequence at separations as close as 1 inch. We have detected stellar companions to the planet bearing stars HD 114762 and Tau Boo. We have also detected a companion to the non-planet bearing star 16 Cyg A.
Date:
November 27, 2000
Creator:
Lloyd, J. P.; Liu, M. C.; Graham, J. R.; Enoch, M.; Kalas, P.; Marcy, G. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Addendum to the Corrective Action Investigation Plan for Corrective Action Unit 321: Area 22 Weather Station Fuel Storage, Nevada Test Site, Nevada (Rev. 0, November 2000)
This addendum to the Corrective Action Investigation Plan (CAIP) contains the U.S. Department of Energy, Nevada Operations Office's approach to determine the extent of contamination existing at Corrective Action Unit (CAU) 321. This addendum was required when the extent of contamination exceeded the estimate in the original Corrective Action Decision Document (CADD). Located in Area 22 on the Nevada Test Site, Corrective Action Unit 321, Weather Station Fuel Storage, consists of Corrective Action Site 22-99-05, Fuel Storage Area, was used to store fuel and other petroleum products necessary for motorized operations at the historic Camp Desert Rock facility. This facility was operational from 1951 to 1958 and dismantled after 1958. Based on site history and earlier investigation activities at CAU 321, the contaminant of potential concern (COPC) was previously identified as total petroleum hydrocarbons (diesel-range organics). The scope of this corrective action investigation for the Fuel Storage Area will include the selection of biased sample locations to determine the vertical and lateral extent of contamination, collection of soil samples using rotary sonic drilling techniques, and the utilization of field-screening methods to accurately determine the extent of COPC contamination. The results of this field investigation will support a defensible evaluation of …
Date:
November 3, 2000
Creator:
United States. Department of Energy. Nevada Operations Office.
Object Type:
Report
System:
The UNT Digital Library
Adiabatic Quasi-Spherical Compressions Driven by Magnetic Pressure for Inertial Confinement Fusion
The magnetic implosion of a high-Z quasi-spherical shell filled with DT fuel by the 20-MA Z accelerator can heat the fuel to near-ignition temperature. The attainable implosion velocity on Z, 13-cm/{micro}s, is fast enough that thermal losses from the fuel to the shell are small. The high-Z shell traps radiation losses from the fuel, and the fuel reaches a high enough density to reabsorb the trapped radiation. The implosion is then nearly adiabatic. In this case the temperature of the fuel increases as the square of the convergence. The initial temperature of the fuel is set by the heating of an ion acoustic wave to be about 200-eV after a convergence of 4. To reach the ignition temperature of 5-keV an additional convergence of 5 is required. The implosion dynamics of the quasi-spherical implosion is modeled with the 2-D radiation hydrodynamic code LASNEX. LASNEX shows an 8-mm diameter quasi-spherical tungsten shell on Z driving 6-atmospheres of DT fuel nearly to ignition at 3.5-keV with a convergence of 20. The convergence is limited by mass flow along the surface of the quasi-spherical shell. With a convergence of 20 the final spot size is 400-{micro}m in diameter.
Date:
November 1, 2000
Creator:
NASH,THOMAS J.
Object Type:
Report
System:
The UNT Digital Library
The Adsorption and Reactions of Halogenated Volatile Organic Compounds (VOCs) on Metal Oxides - Final Report
The purpose of this research was to provide a fundamental understanding of the adsorption and catalytic reactions of CCl{sub 4} on metal oxide surfaces with a view to developing strategies for its remediation. The scientific knowledge generated by this project should enable environmental engineers to evaluate the potential of destructive adsorption of CCl{sub 4} and the catalytic reaction of CCl{sub 4} with H{sub 2}O as an alternative for the remediation of carbon tetrachloride. Emphasis was placed on the alkaline earth metal oxides, i.e., MgO, CaO, SrO and BaO because it had previously been demonstrated that MgO and CaO reacted with CCl{sub 4} to form the corresponding metal chloride and carbon dioxide. This process was named destructive adsorption. It was found that the activity toward CCl{sub 4} parallels the basicity of the alkaline earth metal oxide, i.e., the activity decreased in the order BaO>SrO>CaO>MgO. It was found that MgO is active as a catalyst for the reaction of CCl{sub 4} with H{sub 2}O to form CO{sub 2} and HCl. The HCl could be neutralized in aqueous NaOH, and the resulting dilute salt solution could be easily disposed of. Among the alkaline earth oxides, MgO is the only active catalyst at moderate …
Date:
November 1, 2000
Creator:
Lunsford, J. H.
Object Type:
Report
System:
The UNT Digital Library
Advanced Computational Model for Three-Phase Slurry Reactors Progress Report: November 2000
In the first year of the project, solid-fluid mixture flows in ducts and passages at different angle of orientations were analyzed. The model predictions are compared with the experimental data and good agreement was found. Progress was also made in analyzing the gravity chute flows of solid-liquid mixtures. An Eulerian-Lagrangian formulation for analyzing three-phase slurry flows in a bubble column is being developed. The approach uses an Eulerian analysis of gas liquid flows in the bubble column, and makes use of the Lagrangian particle tracking procedure to analyze the particle motions. Progress was also made in developing a rate dependent thermodynamically consistent model for multiphase slurry flows in a state of turbulent motion. The new model includes the effect of phasic interactions and leads to anisotropic effective phasic stress tensors. Progress was also made in measuring concentration and velocity of particles of different sizes near a wall in a duct flow. The formulation of a thermodynamically consistent model for chemically active multiphase solid-fluid flows in a turbulent state of motion was also initiated. The general objective of this project is to provide the needed fundamental understanding of three-phase slurry reactors in Fischer-Tropsch (F-T) liquid fuel synthesis. The other main goal …
Date:
November 1, 2000
Creator:
Ahmadi, Goodarz
Object Type:
Report
System:
The UNT Digital Library
Advanced Lost Foam Casting Technology
This report describes the research done under the six tasks to improve the process and make it more functional in an industrial environment. Task 1: Pattern Pyrolysis Products and Pattern Properties Task 2: Coating Quality Control Task 3: Fill and Solidification Code Task 4: Alternate Pattern Materials Task 5: Casting Distortion Task 6: Technology Transfer
Date:
November 30, 2000
Creator:
Bates, Charles E.; Littleton, Harry E.; Askeland, Don; Molibog, Taras; Hopper, Jason & Vatankhah, Ben
Object Type:
Report
System:
The UNT Digital Library
Advanced Wall Framing; BTS Technology Fact Sheet
Advanced framing techniques for home construction have been researched extensively and proven effective. Both builders and home owners can benefit from advanced framing. Advanced framing techniques create a structurally sound home that has lower material and labor costs than a conventionally framed house. This fact sheet describes advanced framing techniques, design considerations, and framing.
Date:
November 7, 2000
Creator:
Institute, Southface Energy & Tromly, K.
Object Type:
Book
System:
The UNT Digital Library
AGE AND ORIGIN OF BASE- AND PRECIOUS-METAL VEINS OF THE COEUR D'ALENE MINING DISTRICT, IDAHO
Ore-bearing quartz-carbonate veins of the Coeur d'Alene mining district yield {sup 87}Sr/{sup 86}Sr ratios of 0.74 to >1.60 for low-Rb/Sr, carbonate gangue minerals, similar to current ranges measured in Middle Proterozoic, high-Rb/Sr rocks of the Belt Supergroup. Stable-isotope and fluid-inclusion studies establish a genetic relationship between vein formation and metamorphic-hydrothermal systems of the region. These extraordinary {sup 87}Sr/{sup 86}Sr ratios require accumulation of radiogenic {sup 87}Sr in a high Rb/Sr system over an extended period prior to incorporation of Sr into the veins by hydrothermal processes. Evaluation of the age and composition of potential sources of highly radiogenic Sr indicates that the ore-bearing veins of the Coeur d'Alene district formed within the last 200 Ma from components scavenged from sedimentary and metasedimentary rocks of the Belt Supergroup, the primary host-rocks of the district. These results are consistent with a Cretaceous or Early Tertiary age for these veins. Pb-Zn deposits that yield Pb isotope, K-Ar, and Ar-Ar results indicative of a Proterozoic age probably formed during deposition or diagenesis of the Belt Supergroup at 1350-1500 Ma, possibly as Sullivan-type syngenetic deposits. K-Ar and Rb-Sr apparent ages and {delta}{sup 18}O values of Belt Supergroup rocks decrease southward from the Coeur d'Alene district …
Date:
November 7, 2000
Creator:
Fleck, R J; Criss, R E; Eaton, G F; Cleland, R W; Wavra, C S & Bond, W D
Object Type:
Report
System:
The UNT Digital Library