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[News Clip: Clearlake]
Video footage from the NBC 5/KXAS station in Fort Worth, Texas, to accompany a news story about flooding in Clear Lake, California. This story was produced for the 10:00 P.M. news broadcast.
Date:
February 9, 1998, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Thermodynamics of lattice QCD with 2 quark flavours : chiral symmetry and topology.
We have studied the restoration of chiral symmetry in lattice QCD at the finite temperature transition from hadronic matter to a quark-gluon plasma. By measuring the screening masses of flavour singlet and non-singlet meson excitations, we have seen evidence that, although flavour chiral symmetry is restored at this transition, flavour singlet (U(1)) axial symmetry is not. We conclude that this indicates that instantons continue to play an important role in the quark-gluon plasma phase.
Date:
June 9, 1998
Creator:
Lagae, J.-F.
Object Type:
Article
System:
The UNT Digital Library
Emission estimates for air pollution transport models.
The results of studies of energy consumption and emission inventories in Asia are discussed. These data primarily reflect emissions from fuel combustion (both biofuels and fossil fuels) and were collected to determine emissions of acid-deposition precursors (SO{sub 2} and NO{sub x}) and greenhouse gases (CO{sub 2} CO, CH{sub 4}, and NMHC) appropriate to RAINS-Asia regions. Current work is focusing on black carbon (soot), volatile organic compounds, and ammonia.
Date:
October 9, 1998
Creator:
Streets, D. G.
Object Type:
Article
System:
The UNT Digital Library
MCO Monitoring issue closure package
Agreement on a focused, limited approach to MCO monitoring has been documented. While the value of monitoring has been understood by those interested in the SNF Project, there had been a diversity of opinion on details of approach and implementation. For this reason, MCO monitoring had been identified as a technical issue. A cooperative effort involving the contractor, RL, and the technical assistance group (TAG), resulted in the definition of an approach agreeable to all and of the remaining details to be resolved through conceptual engineering. MCO monitoring will consist of temperature, pressure, and gas composition monitoring of 4 to 6 MCOs for up to two years. High pressure detection capability for the duration of interim storage for every MCO will also be evaluated and implemented within the current project baseline, if possible. Otherwise a BCR will be prepared and submitted.
Date:
November 9, 1998
Creator:
SEXTON, R.A.
Object Type:
Report
System:
The UNT Digital Library
GaN: Defect and Device Issues
The role of extended and point defects, and key impurities such as C, O and H, on the electrical and optical properties of GaN is reviewed. Recent progress in the development of high reliability contacts, thermal processing, dry and wet etching techniques, implantation doping and isolation and gate insulator technology is detailed. Finally, the performance of GaN-based electronic and photonic devices such as field effect transistors, UV detectors, laser diodes and light-emitting diodes is covered, along with the influence of process-induced or grown-in defects and impurities on the device physics.
Date:
November 9, 1998
Creator:
Pearton, S. J.; Ren, F.; Shul, R. J. & Zolper, J. C.
Object Type:
Article
System:
The UNT Digital Library
ICF quarterly report January - March 1997 volume 7, number 3
The National Ignition Facility Project The mission of the National Ignition Facility (NIF) is to produce ignition and modest energy gain in inertial confinement fusion (ICF) targets. Achieving these goals will maintain U.S. world leadership in ICF and will directly benefit the U.S. Department of Energy (DOE) missions in national security, science and technology, energy resources, and industrial competitiveness. Development and operation of the NIF are consistent with DOE goals for environmental quality, openness to the community, and nuclear nonproliferation and arms control. Although the primary mission of inertial fusion is for defense applications, inertial fusion research will provide critical information for the development of inertial fusion energy. The NIF, under construction at Lawrence Livermore National Laboratory (LLNL), is a cornerstone of the DOE's science-based Stockpile Stewardship Program for addressing high-energy-density physics issues in the absence of nuclear weapons testing. In pursuit of this mission, the DOE's Defense Programs has developed a state-of-the-art capability with the NIF to investigate high-energy-density physics in the laboratory with a microfusion capability for defense and energy applications. As a Strategic System Acquisition, the NIF Project has a separate and disciplined reporting chain to DOE as shown below.
Date:
April 9, 1998
Creator:
Murray, J
Object Type:
Report
System:
The UNT Digital Library
Studies of electrolyte penetration in carbon anodes by NMR techniques.
A toroid cavity nuclear magnetic resonance (NMR) detector capable of recording radial concentration profiles, diffusion constants, and displacements of charge carriers was employed to investigate the lithium ion distribution in an electrochemical cell containing a carbonaceous material synthesized from pyrene and pillared clays as inorganic templates. A carbon rod was used in a control experiment to assign the Li{sup +} spectrum and to calibrate the one dimensional radial images.
Date:
December 9, 1998
Creator:
Sandi, G.
Object Type:
Article
System:
The UNT Digital Library
Design package for fuel retrieval system fuel handling tool modification
This is a design package that contains the details for a modification to a tool used for moving fuel elements during loading of MCO Fuel Baskets for the Fuel Retrieval System. The tool is called the fuel handling tool (or stinger). This document contains requirements, development design information, tests, and test reports.
Date:
November 9, 1998
Creator:
TEDESCHI, D.J.
Object Type:
Report
System:
The UNT Digital Library
QCD bound states and their response to extremes of temperature and density.
We describe the application of Dyson-Schwinger equations to the calculation of hadron observable. The studies at zero temperature (T) and quark chemical potential ({mu}) provide a springboard for the extension to finite-(T, {mu}). Our exemplars highlight that much of hadronic physics can be understood as simply a manifestation of the nonperturbative, momentum-dependent dressing of the elementary Schwinger functions in QCD.
Date:
June 9, 1998
Creator:
Maris, P.
Object Type:
Article
System:
The UNT Digital Library
MCO Monitoring activity description
Spent Nuclear Fuel remaining from Hanford's N-Reactor operations in the 1970s has been stored under water in the K-Reactor Basins. This fuel will be repackaged, dried and stored in a new facility in the 200E Area. The safety basis for this process of retrieval, drying, and interim storage of the spent fuel has been established. The monitoring of MCOS in dry storage is a currently identified issue in the SNF Project. This plan outlines the key elements of the proposed monitoring activity. Other fuel stored in the K-Reactor Basins, including SPR fuel, will have other monitoring considerations and is not addressed by this activity description.
Date:
November 9, 1998
Creator:
SEXTON, R.A.
Object Type:
Report
System:
The UNT Digital Library
Cone penetrometer demonstration standard startup review checklist
Startup readiness for the Cone Penetrometer Demonstration in AX Tank Farm will be verified through the application of a Standard Startup Review Checklist. This is a listing of those items essential to demonstrating readiness to start the Cone Penetrometer Demonstration in AX Tank Farm.
Date:
November 9, 1998
Creator:
KRIEG, S.A.
Object Type:
Report
System:
The UNT Digital Library
Membrane-based air composition control for light-duty diesel vehicles : a benefit and cost assessment.
This report presents the methodologies and results of a study conducted by Argonne National Laboratory (Argonne) to assess the benefits and costs of several membrane-based technologies. The technologies evaluated will be used in automotive emissions-control and performance-enhancement systems incorporated into light-duty diesel vehicle engines. Such engines are among the technologies that are being considered to power vehicles developed under the government-industry Partnership for a New Generation of Vehicles (PNGV). Emissions of nitrogen oxides (NO{sub x}) from diesel engines have long been considered a barrier to use of diesels in urban areas. Recently, particulate matter (PM) emissions have also become an area of increased concern because of new regulations regarding emissions of particulate matter measuring 2.5 micrometers or less (PM2.5). Particulates are of special concern for diesel engines in the PNGV program; the program has a research goal of 0.01 gram per mile (g/mi) of particulate matter emissions under the Federal Test Procedure (FTP) cycle. This extremely low level (one-fourth the level of the Tier II standard) could threaten the viability of using diesel engines as stand-alone powerplants or in hybrid-electric vehicles. The techniques analyzed in this study can reduce NO{sub x} and particulate emissions and even increase the power density …
Date:
November 9, 1998
Creator:
Poola, R. & Stork, K.
Object Type:
Report
System:
The UNT Digital Library
Engineering assessment of CO{sub 2} recovery, transport, and utilization.
The need to establish benchmarks for available power-generating cycles having reduced atmospheric emissions of CO{sub 2} served as the basis for this study. Innovative process technologies need this benchmark so they can be appreciated in their proper perspective. An oxygen-blown KRW coal-gasification plant producing hydrogen, electricity, and supercritical-CO{sub 2}, was studied in a full-energy cycle analysis extending from the coal mine to the final destination of the gaseous product streams. A location in the mid-western US 100 mi from Old Ben No.26 mine was chosen. Three parallel gasifier trains, each capable of providing 42% of the plant's 413.5 MW nominal capacity use 3,845 tons/day of Illinois No.6 coal from this mine. The plant produces a net 52 MW of power and 131 MMscf/day of 99.999% purity hydrogen which is sent 62 mi by pipeline at 34 bars. The plant also produces 112 MMscf/day of supercritical-CO{sub 2} at 143 bars, which is sequestered in enhanced oil recovery operations 310 mi away.
Date:
October 9, 1998
Creator:
Doctor, R. D.
Object Type:
Article
System:
The UNT Digital Library
Search for new physics in D{+-} {r_arrow} K{sub s}X{+-} and D{+-} {r_arrow} K{sub s}K{sub s}K{+-}.
Direct CP violation beyond the standard model can be produced in charged D decays to final states with a K{sub S} by small new physics contributions to the transitions D{sup +} {r_arrow} K{sup 0}X{sup +}, where X{sup +} denotes any positively charged hadronic state or transitions D{sup +} {r_arrow} K{sup 0}{bar K}{sup 0}K{sup (*)+}, denotes any positive strange state. These transitions are doubly-Cabibbo suppressed and color suppressed in the standard model and branching ratios are experimentally observed to be suppressed by two orders of magnitude relative to the allowed D{sup +} {r_arrow} {bar K}{sup 0}X{sup +} or D{sup +} {r_arrow} {bar K}{sup 0}{bar K}{sup 0}K{sup (*)+}, branching ratio. An even smaller new physics contribution might produce an observable CP asymmetry in D{sup {+-}} {r_arrow} K{sub S}X{sup {+-}} or D{sup {+-}} {r_arrow} K{sub S}K{sub S}K{sup (*){+-}} decays. Since such asymmetries are easily checked in the early stages of any charm production experiment, it seems worth while to check them before the opportunity is lost in later stages of the analysis, even if no theoretical model predicts such an asymmetry.
Date:
November 9, 1998
Creator:
Lipkin, H. J.
Object Type:
Article
System:
The UNT Digital Library
Let's Not Panic Over the Year 2000
This report addresses various facts and myths concerning the Y2K (Year 2000) problem.
Date:
November 9, 1998
Creator:
Blackledge, M.A.
Object Type:
Article
System:
The UNT Digital Library
A dynamic inert metal anode.
A new concept for a stable anode for aluminum electrowinning is described. The anode consists of a cup-shaped metal alloy container filled with a molten salt that contains dissolved aluminum. The metal alloy can be any of a number of alloys, but it must contain aluminum as a secondary alloying metal. A possible alloy composition is copper with 5 to 15 weight percent aluminum. In the presence of oxygen, aluminum on the metal anode's exterior surface forms a continuous alumina film that is thick enough to protect the anode from chemical attack by cryolite during electrolysis and thin enough to maintain electrical conductivity. However, the alumina film is soluble in cryolite, so it must be regenerated in situ. Film regeneration is achieved by the transport of aluminum metal from the anode's molten salt interior through the metal wall to the anode's exterior surface, where the transported aluminum oxidizes to alumina in the presence of evolving oxygen to maintain the protective alumina film. Periodic addition of aluminum metal to the anode's interior keeps the aluminum activity in the molten salt at the desired level. This concept for an inert anode is viable as long as the amount of aluminum produced at …
Date:
November 9, 1998
Creator:
Hryn, J. N.
Object Type:
Article
System:
The UNT Digital Library
A low-neutron background slow-positron source.
The addition of a thermionic rf gun [1] and a photocathode rf gun will allow the Advanced Photon Source (APS) linear accelerator (linac) [2] [3] to become a free-electron laser (FEL) driver [4]. As the FEL project progresses, the existing high-charge DC thermionic gun will no longer be critical to APS operation and could be used to generate high-energy or low-energy electrons to drive a slow-positron source. We investigated possibilities to create a useful low-energy source that could operate semi-independently and would have a low neutron background.
Date:
October 9, 1998
Creator:
White, M. M.
Object Type:
Article
System:
The UNT Digital Library
Data Rich, Information Poor
Surviving in a data-rich environment means understanding the difference between data and information. This paper reviews an environmental case study that illustrates that understanding and shows its importance. In this study, a decision problem was stated in terms of au economic-objective fimction. The function contains a term that defines the stochastic relationship between the decision and the information obtained during field chamctetition for an environmental contaminant. Data is defied as samples drawn or experimental realizations of a mudom fimction. Information is defined as the quantitative change in the value of the objective fiction as a result of the sample.
Date:
November 9, 1998
Creator:
Kaplan, P. G. & Rautman, C. A.
Object Type:
Article
System:
The UNT Digital Library
Post Test Analysis of a PCCV Model Dynamically Tested Under Simulated Design-Basis Earthquakes
In a collaborative program between the United States Nuclear Regulatory Commission (USNRC) and the Nuclear Power Engineering Corporation (NUPEC) of Japan under sponsorship of the Ministry of International Trade and Ihdustry, the seismic behavior of Prestressed Concrete Containment Vessels (PCCV) is being investigated. A 1:10 scale PCCV model has been constructed by NUPEC and subjected to seismic simulation tests using the high performance shaking table at the Tadotsu Engineering Laboratory. A primary objective of the testing program is to demonstrate the capability of the PCCV to withstand design basis earthquakes with a significant safety margin against major damage or failure. As part of the collaborative program, Sandia National Laboratories (SNL) is conducting research in state-of-the-art analytical methods for predicting the seismic behavior of PCCV structures, with the eventual goal of understanding, validating, and improving calculations dated to containment structure performance under design and severe seismic events. With the increased emphasis on risk-informed- regulatory focus, more accurate ch&@erization (less uncertainty) of containment structural and functional integri~ is desirable. This paper presents results of post-test calculations conducted at ANATECH to simulate the design level scale model tests.
Date:
November 9, 1998
Creator:
Cherry, J.; Chokshi, N.; James, R. J.; Rashid, Y. R.; Tsurumaki, S. & Zhang, L.
Object Type:
Article
System:
The UNT Digital Library
Application experiences with the Globus toolkit.
The Globus grid toolkit is a collection of software components designed to support the development of applications for high-performance distributed computing environments, or ''computational grids'' [14]. The Globus toolkit is an implementation of a ''bag of services'' architecture, which provides application and tool developers not with a monolithic system but rather with a set of stand-alone services. Each Globus component provides a basic service, such as authentication, resource allocation, information, communication, fault detection, and remote data access. Different applications and tools can combine these services in different ways to construct ''grid-enabled'' systems. The Globus toolkit has been used to construct the Globus Ubiquitous Supercomputing Testbed, or GUSTO: a large-scale testbed spanning 20 sites and included over 4000 compute nodes for a total compute power of over 2 TFLOPS. Over the past six months, we and others have used this testbed to conduct a variety of application experiments, including multi-user collaborative environments (tele-immersion), computational steering, distributed supercomputing, and high throughput computing. The goal of this paper is to review what has been learned from these experiments regarding the effectiveness of the toolkit approach. To this end, we describe two of the application experiments in detail, noting what worked well and what …
Date:
June 9, 1998
Creator:
Brunett, S.
Object Type:
Article
System:
The UNT Digital Library
ATLAS: A Small, Light Weight, Time-Synchronized Wind-Turbine Data Acquistion System
Wind energy researchers at Sandia National Laboratories have developed a small, lightweight, time- synchronized, robust data acquisition system to acquire long-term time-series data on a wind turbine rotor. A commercial data acquisition module is utilized to acquire data simultaneously from multip!e strain-gauge, analog, and digital channels. Acquisition of rotor data at precisely the same times as acquisition of ground data is ensured by slaving the acquisition clocks on the rotor- based data unit and ground-based units to the Global Positioning Satellite (GPS) system with commercial GPS receiver units and custom-built and programmed programmable logic devices. The acquisition clocks will remain synchronized within two microseconds indefinitely. Field tests have confirmed that synchronization can be maintained at rotation rates in excess of 350 rpm, Commercial spread-spectrum radio modems are used to transfer the rotor data to a ground- based computer concurrently with data acquisition, permitting continuous acquisition of data over a period of several hours, days or even weeks.
Date:
November 9, 1998
Creator:
Berg, D.E.; Robertson, P. & Zayas, J.
Object Type:
Article
System:
The UNT Digital Library
Esperanzaite, NaCa(2)Al(2)(As(5+)O(4))[As(5+)O(3)(OH)](OH)(2)F(4)(H(2)O), A New Mineral From Mina La Esperanza, Mexico: Descriptive Mineralogy and Atomic Arrangement
Esperanzaite, ideally NaCazA12(As5+0.i)[As5+03 (OH)] (OH)2FJH20), Z =2, is a new mineral from the Mina h Esperarq Durango State, Mexico. The mineral occurs as blue-green botryoidal crystalline masses on rhyolite, with separate spheres up to 1.5 mm Y Deceased in diameter. Mobs hardness is 4.5, specific gravity 3.240h, and 3.36( 3)C.IC. Optical properties were measured in 589 nm light. Esperanzaite is biaxial (-), .Y= Y = Z= colorless, a 1.580(1), ~ 1.588( 1), and y 1.593(1 ); 2V0hs is 74(1 ~ and 2 }'CUIC is 76.3". Dispersion is medium, r < v, and optic axes are oriented as a A Z = +50.5o, b = Y, c P. X = +35". The five strongest X-ray diffraction maxima in the powder pattern are (~ /, hk~: 2.966,100, 13 i, 31 i, 031 ; 3.527,90, 220; 2.700,90,221,002, 040; 5.364>80, 001, 020; 4.796,80,011. Esperanzaite is monoclinic, u 9.687(5), b 10.7379(6), c 5.5523(7)& ~ 105.32( 1 )", space group P21/nz. The atomic arrangement of esperanzaite was solved by Direct Methods and Fourier analysis (R= 0.03 1). The Fundamental Building Block is formed of stacks of heteropolyhedral tetramers; the tetramers are formed of two arsenate tetrahedral and two Al octahedra, comer-linked in 4-member rings. The Fundamental …
Date:
November 9, 1998
Creator:
Cureton, F.; Falster, A. U.; Foord, E. E.; Hlava, P. F.; Hughes, J. M. & Maxwell, C. H.
Object Type:
Article
System:
The UNT Digital Library
Proton decay of the closed neutron shell nucleus {sup 155}Ta
The new proton radioactivity {sup 155}Ta has been observed. It was produced via the p4n fusion evaporation channel using a {sup 58}Ni beam on a {sup 102}Pd target. The measured decay properties were: E{sub p} = (1765 {+-} 10) keV and t{sub 1/2} = (12{sub {minus}3}{sup +4}) {micro}s. Using the WKB approximation a spin and parity of J{sup {pi}} = 11/2{sup 2{minus}} and a spectroscopic factor of S{sub p}{sup exp} = 0.58{sub {minus}0.17}{sup +0.22} were determined.
Date:
July 9, 1998
Creator:
Uusitalo, J.
Object Type:
Article
System:
The UNT Digital Library
Carbons for lithium ion cells prepared using sepiolite as an inorganic template.
Carbon anodes for Li ion cells have been prepared by the in situ polymerization of olefins such as propylene and ethylene in the channels of sepiolite clay mineral. Upon dissolution of the inorganic framework, a disordered carbon was obtained. The carbon was tested as anode in coin cells, yielding a reversible capacity of 633 mAh/g, 1.70 times higher than the capacity delivered by graphitic carbon, assuming 100% efficiency. The coulombic efficiency was higher than 90%.
Date:
December 9, 1998
Creator:
Sandi, G.
Object Type:
Article
System:
The UNT Digital Library