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Characterize Framework for Igneous Activity at Yucca Mountain, Nevada
None
Date:
November 3, 2003
Creator:
Perry, F.; Youngs, R. & Vogt, T.
Object Type:
Report
System:
The UNT Digital Library
Recoil ion charge state distribution following the beta(sup +) decay of {sup 21}Na
The charge state distribution following the positron decay of 21Na has been measured, with a larger than expected fraction of the daughter 21Ne in positive charge states. No dependence on either the positron or recoil nucleus energy is observed. The data is compared to a simple model based on the sudden approximation. Calculations suggest a small but important contribution from recoil ionization has important consequences for precision beta decay correlation experiments detecting recoil ions.
Date:
January 3, 2003
Creator:
Scielzo, Nicholas D.; Freedman, Stuart J.; Fujikawa, Brian K. & Vetter, Paul A.
Object Type:
Article
System:
The UNT Digital Library
Testing the cosmological constant as a candidate for dark energy
It may be difficult to single out the best model of dark energy on the basis of the existing and planned cosmological observations, because many different models can lead to similar observational consequences. However, each particular model can be studied and either found consistent with observations or ruled out. In this paper, we concentrate on the possibility to test and rule out the simplest and by far the most popular of the models of dark energy, the theory described by general relativity with positive vacuum energy (the cosmological constant). We evaluate the conditions under which this model could be ruled out by the future observations made by the Supernova/Acceleration Probe SNAP (both for supernovae and weak lensing) and by the Planck Surveyor cosmic microwave background satellite.
Date:
December 3, 2003
Creator:
Kratochvil, Jan; Linde, Andrei; Linder, Eric V. & Shmakova, Marina
Object Type:
Article
System:
The UNT Digital Library
A review of in-situ chemical oxidation and heterogeneity
None
Date:
February 3, 2003
Creator:
Seol, Yongkoo; Zhang, Hubao & Schwartz, Frank W.
Object Type:
Article
System:
The UNT Digital Library
SCOR: Structural classification of RNA, Version 2.0
SCOR (http://scor.lbl.gov), the Structural Classification of RNA, is a database designed to provide a comprehensive perspective and understanding of RNA motif three-dimensional structure, function, tertiary interactions, and their relationships. SCOR 2.0 represents a major expansion and introduces a wholly new classification system. The new version represents the classification as a Directed Acyclic Graph (DAG), which allows a classification node to have multiple parents, in contrast to the strictly hierarchical classification used in SCOR 1.2. SCOR 2.0 supports three types of query terms in the updated search engine: PDB or NDB identifier, nucleotide sequence, and keyword. We also provide parseable XML files for all information. This new release contains 511RNA entries from the PDB as of 15 May 2003. A total of 5,880 secondary structural elements are classified; 2,104 hairpin loops and 3,776 internal loops. RNA motifs reported in the literature, such as ''Kinkturn'' and ''GNRA loops,'' are now incorporated into the structural classification along with definitions and descriptions.
Date:
October 3, 2003
Creator:
Tamura, Makio; Hendrix, Donna K. & Klosterman, Peter
Object Type:
Article
System:
The UNT Digital Library
2002 status report: Savings estimates for the ENERGY STAR(R) voluntary labeling program
ENERGY STAR [registered trademark] is a voluntary labeling program designed to identify and promote energy-efficient products, buildings and practices. Operated jointly by the Environmental Protection Agency (EPA) and the U.S. Department of Energy (DOE), ENERGY STAR labels exist for more than thirty products, spanning office equipment, residential heating and cooling equipment, commercial and residential lighting, home electronics, and major appliances. This report presents savings estimates for a subset of ENERGY STAR program activities, focused primarily on labeled products. We present estimates of the energy, dollar and carbon savings achieved by the program in the year 2001, what we expect in 2002, and provide savings forecasts for two market penetration scenarios for the period 2002 to 2020. The target market penetration forecast represents our best estimate of future ENERGY STAR savings. It is based on realistic market penetration goals for each of the products. We also provide a forecast under the assumption of 100 percent market penetration; that is, we assume that all purchasers buy ENERGY STAR-compliant products instead of standard efficiency products throughout the analysis period.
Date:
March 3, 2003
Creator:
Webber, Carrie A.; Brown, Richard E.; McWhinney, Marla & Koomey, Jonathan
Object Type:
Report
System:
The UNT Digital Library
Overcharge protection for rechargeable lithium batteries using electroactive polymers
None
Date:
April 3, 2003
Creator:
Chen, Guoying & Richardson, Thomas J.
Object Type:
Article
System:
The UNT Digital Library
DOE Grant for Travel - ISMB 2002, Edmont, Canada.
The Intelligent Systems for Molecular Biology (ISMB) conference is the oldest and largest conference that specifically addresses bioinformatics and computational biology, i.e. interdisciplinary research that falls between computer science and biology, ISMB is distinguished from many other conferences in computational biology or artificial intelligence by an insistence that the researchers work with real molecular biology data, not theoretical examples; and from many other biological conferences by providing a forum for technical advances as they occur, which otherwise may be shunned until a firm experimental result is published. The resulting intellectual richness and cross-disciplinary diversity provides an important opportunity for both students and senior researchers. ISMB has become the premier conference series in this field with refereed, published proceedings, establishing an infrastructure to promote the growing body of research. ISMB comprises five main types of presentations: tutorials, plenary presentations, poster presentations, topically focused satellite meetings and software demonstrations. These tutorials and fellows contribute to the development of human resources by allowing students and post-doctoral fellows to reach a state-of-the-art level rapidly, and to begin making contributions to the field. At ISMB 2002, 15 tutorials were held, 50 papers were presented, 498 posters were presented, 6 special interest group meetings here held, …
Date:
August 3, 2003
Creator:
Rost, Burkhard
Object Type:
Report
System:
The UNT Digital Library
A Polymer Membrane Containing Fe0 as a Contaminant Barrier
A polyvinyl alcohol (PVA) membrane containing iron (Fe0) particles was developed and tested as a model barrier for contaminant containment. Carbon tetrachloride, copper (Cu2+), nitrobenzene, 4-nitroacetophenone, and chromate (CrO4 2-) were selected as model contaminants. Compared with a pure PVA membrane, the Fe0/PVA membrane can increase the breakthrough lag time for Cu2+ and carbon tetrachloride by more than 100 fold. The increase in the lag time was smaller for nitrobenzene and 4-nitroacetophenone which stoichiometrically require more iron and for which the PVA membrane has a higher permeability. The effect of Fe0 was even smaller for CrO4 2- because of its slow reaction. Forty-five percent of the iron, based on the content in the dry membrane prior to hydration, was consumed by reaction with Cu2+ and 19% by reaction with carbon tetrachloride. Similarly, 25%, 17%, and 6% of the iron was consumed by nitrobenzene, 4-nitroacetophenone, and CrO4 2-, respectively. These percentages approximately double when the loss of iron during membrane hydration is considered. The permeability of the Fe0/PVA membrane after breakthrough was within a factor of three for that of pure PVA, consistent with theory. These results suggest that polymer membranes with embedded Fe0 have potential as practical contaminant barriers.
Date:
November 3, 2003
Creator:
Shimotori, Tsutomu; Nuxoll, Eric E.; Cussler, Edward L. & Arnold, William A.
Object Type:
Report
System:
The UNT Digital Library
Effects of electron concentration on the optical absorption edge of InN
None
Date:
December 3, 2003
Creator:
Wu, J.; Walukiewicz, W.; Li, S. X.; Armitage, R.; Ho, J. C.; Weber, E. R. et al.
Object Type:
Article
System:
The UNT Digital Library
MEASUREMENT OF FRICTIONAL PRESSURE DIFFERENTIALS DURING A VENTILATION SURVEY
During the course of a ventilation survey, both airflow quantity and frictional pressure losses are measured and quantified. The measurement of airflow has been extensively studied as the vast majority of ventilation standards/regulations are tied to airflow quantity or velocity. However, during the conduct of a ventilation survey, measurement of airflow only represents half of the necessary parameters required to directly calculate the airway resistance. The measurement of frictional pressure loss is an often misunderstood and misapplied part of the ventilation survey. This paper compares the two basic methods of frictional pressure drop measurements; the barometer and the gauge and tube. Personal experiences with each method will be detailed along with the authors' opinions regarding the applicability and conditions favoring each method.
Date:
November 3, 2003
Creator:
B.S. Prosser, PE & I.M. Loomis, PE, PhD
Object Type:
Report
System:
The UNT Digital Library
X-ray study of aligned magnetic stripe domains in perpendicular multilayers
We have investigated the stripe domain structure and the magnetic reversal of perpendicular Co/Pt based multilayers at room temperature using magnetometry, magnetic imaging and magnetic x-ray scattering. In-plane field cycling aligns the stripe domains along the field direction. In magnetic x-ray scattering the parallel stripe domains act as a magnetic grating resulting in observed Bragg reflections up to 5th order. We model the scattering profile to extract and quantify the domain as well as domain wall widths. Applying fields up to {approx}1.2 kOe perpendicular to the film reversibly changes the relative width of up versus down domains while maintaining the overall stripe periodicity. Fields above 1.2 kOe introduce irreversible changes into the domain structure by contracting and finally annihilating individual stripe domains. We compare the current results with modeling and previous measurements of films with perpendicular anisotropy.
Date:
March 3, 2003
Creator:
Hellwig, O.; Denbeaux, G. P.; Kortright, J. B. & Fullerton, Eric E.
Object Type:
Article
System:
The UNT Digital Library
Visual Communications for Heterogeneous Networks/Visually Optimized Scalable Image Compression. Final Report for September 1, 1995 - February 28, 2002
The authors developed image and video compression algorithms that provide scalability, reconstructibility, and network adaptivity, and developed compression and quantization strategies that are visually optimal at all bit rates. The goal of this research is to enable reliable ''universal access'' to visual communications over the National Information Infrastructure (NII). All users, regardless of their individual network connection bandwidths, qualities-of-service, or terminal capabilities, should have the ability to access still images, video clips, and multimedia information services, and to use interactive visual communications services. To do so requires special capabilities for image and video compression algorithms: scalability, reconstructibility, and network adaptivity. Scalability allows an information service to provide visual information at many rates, without requiring additional compression or storage after the stream has been compressed the first time. Reconstructibility allows reliable visual communications over an imperfect network. Network adaptivity permits real-time modification of compression parameters to adjust to changing network conditions. Furthermore, to optimize the efficiency of the compression algorithms, they should be visually optimal, where each bit expended reduces the visual distortion. Visual optimality is achieved through first extensive experimentation to quantify human sensitivity to supra-threshold compression artifacts and then incorporation of these experimental results into quantization strategies and compression …
Date:
June 3, 2003
Creator:
Hemami, S. S.
Object Type:
Report
System:
The UNT Digital Library
The impact of nanoscience on heterogeneous catalysis
Most catalysts consist of nanometer-sized particles dispersed on a high-surface area support. Advances in characterization methods have led to a molecular level understanding of the relationships between nanoparticle properties and catalytic performance. Together with novel approaches to nanoparticle synthesis, this knowledge is contributing to the design and development of new catalysts.
Date:
March 3, 2003
Creator:
Bell, Alexis T.
Object Type:
Article
System:
The UNT Digital Library
SEARCH FOR THE RARE KAON DECAY K{sup +} {yields} {pi}{sup +} {nu}{bar {nu}}
This thesis describes the search for the rare decay K{sup +} {yields} {pi}{sup +} {nu}{bar {nu}} in the pion momentum region 140 MeV/c {le} P{sub {pi}{sup +}} {le} 195 MeV/c. This is a Flavor Changing Neutral Current (FCNC) decay which is forbidden to the first order in the Standard Model (SM) by the GIM mechanism. However, this decay mode is allowed in the second order by two Z-Penguin and one box diagram and is expected to have a branching ratio of (0.72 {+-} 0.21) x 10{sup -10}. This decay mode is sensitive to the coupling of top to down quark and therefore a measurement of the branching ratio for this decay mode provides a measurement of the Cabibbo-Kobayashi-Maskawa matrix element V{sub td}. The recent observation of two events in the pion momentum region 211 MeV/c {le} P{sup {pi}{sup +}} {le} 229 MeV/c estimates a branching ratio of 1.57{sub -0.82}{sup +1.75} x 10{sup -10} for the same decay mode. We have extended the search for this decay to the lower pion momentum region. Data collected by the Experiment E787 at Brookhaven National Laboratory during the 1996 and 1997 run were analyzed in this thesis.
Date:
May 3, 2003
Creator:
BHUYAN,B.
Object Type:
Report
System:
The UNT Digital Library
MCNPX Model/Table Comparison
MCNPX is a Monte Carlo N-Particle radiation transport code extending the capabilities of MCNP4C. As with MCNP, MCNPX uses nuclear data tables to transport neutrons, photons, and electrons. Unlike MCNP, MCNPX also uses (1) nuclear data tables to transport protons; (2) physics models to transport 30 additional particle types (deuterons, tritons, alphas, pions, muons, etc.); and (3) physics models to transport neutrons and protons when no tabular data are available or when the data are above the energy range (20 to 150 MeV) where the data tables end. MCNPX can mix and match data tables and physics models throughout a problem. For example, MCNPX can model neutron transport in a bismuth germinate (BGO) particle detector by using data tables for bismuth and oxygen and using physics models for germanium. Also, MCNPX can model neutron transport in UO{sub 2}, making the best use of physics models and data tables: below 20 MeV, data tables are used; above 150 MeV, physics models are used; between 20 and 150 MeV, data tables are used for oxygen and models are used for uranium. The mix-and-match capability became available with MCNPX2.5.b (November 2002). For the first time, we present here comparisons that calculate radiation transport …
Date:
March 3, 2003
Creator:
Hendricks, J.S.
Object Type:
Report
System:
The UNT Digital Library
Final Report: Pilot-Scale Cross-Flow Ultrafiltration Test Using a Hanford Site Tank 241-AN-102 Waste Simulant
Bechtel National l, Inc. (BNI) has been contracted to design a Waste Treatment and Immobilization Plant (WTP) to stabilize liquid radioactive waste that is stored at the Hanford Site as part of the River Protection Project (RPP). Because of its experience with radioactive waste stabilization, the Savannah River Technology Center (SRTC) is working with BNI to help design and test certain parts of the waste treatment facility. One part of the process is the separation of radioactive solids from the liquid wastes by cross- flow ultrafiltration. This task tested a cross- flow filter, prototypic in porosity, length and diameter, with a simulated radioactive waste, made to prototypically represent the chemical and physical characteristics of a Hanford waste in tank 241-AN-102 (AN-102) and precipitated under prototypic conditions. This report discusses the results of cross- flow filter operation in a pilot-scale experimental facility. This filter technology was evaluated for its inclusion in the pretreatment section of the nuclear waste stabilization plant being designed by Bechtel National, Inc. The waste treatment plant will be built at the U.S. Department of Energy's Hanford Site as part of the River Protection Project.
Date:
October 3, 2003
Creator:
Duignan, M.R.
Object Type:
Report
System:
The UNT Digital Library
Theoretical modeling of the kinetics of barrierless reactions. Final report: DE-FG02-98ER14902
Recent progress is reported on a research program aimed at developing and applying sophisticated transition state theory-based models for the kinetics of barrierless reactions of importance in combustion. Various applications involving the coupling of the variable reaction coordinate (VRC) transition state theory (TST) methodology with ab initio quantum chemical evaluations and/or master equation simulations were provided. Reactions studied included the C{sub 3}H{sub 3} + H and C{sub 3}H{sub 5} + H addition reactions, C{sub 2}H{sub 3} + C{sub 2}H{sub 2} and C{sub 2}H{sub 5} + O{sub 2} reactions, and the unimolecular dissociation of ketene.
Date:
January 3, 2003
Creator:
Klippenstein, Stephen J.
Object Type:
Report
System:
The UNT Digital Library
An Evaluation of Aquifer Source Node Location Alternatives for E-Area Slit Trench Performance Assessment
The present special study proposes an improvement to the current method for selecting aquifer source node locations that is a more realistic representation of actual subsurface conditions. This improved concept for defining aquifer source node locations has been identified through an objective evaluation of several alternatives.
Date:
June 3, 2003
Creator:
Flach, G. P.
Object Type:
Report
System:
The UNT Digital Library
Use of time- and chemically-Resolved particulate data to characterize the infiltration of outdoor PM-2.5 into a residence in the San Joaquin Valley
None
Date:
July 3, 2003
Creator:
Lunden, Melissa M.; Thatcher, Tracy L.; Hering, Susanne V. & Brown, Nancy J.
Object Type:
Article
System:
The UNT Digital Library
Using government purchasing power to reduce equipment standby power
Although the government sector represents only 10 to 15 percent of the economy in most countries, carefully targeted public procurement can play a significant role in market transformation through its influence on both buyers and suppliers. Government leadership in energy-efficient purchasing can set an example for other buyers, while creating opportunities for leading manufacturers and distributors to increase their sales and market share by offering energy-efficient products at competitive prices. Under proper circumstances, a highly visible government purchasing policy can have a disproportionately large influence on the market for efficient products. In the United States, President Bush signed an Executive Order in 2001 directing all federal agencies to buy products with low standby power (1 watt or less where possible). This represents a deliberate choice to use government purchasing - rather than regulations or incentives - as a market-based strategy to encourage energy savings. It also builds upon existing efforts to encourage Federal purchase of energy-efficient products (Energy Star products and others in the top 25th percentile of efficiency). This paper summarizes the Federal Energy Management Program s first 18 months of experience in implementing this Executive Order, including analysis of data on standby power, interactions with manufacturers and industry …
Date:
March 3, 2003
Creator:
Harris, Jeffrey; Meier, Alan; Bartholomew, Emily; Thomas, Alison; Glickman, Joan & Michelle, Ware
Object Type:
Article
System:
The UNT Digital Library
Tank 50H Tetraphenylborate Destruction Results
We conducted several scoping tests with both Tank 50H surrogate materials (KTPB and phenol) as well as with actual Tank 50H solids. These tests examined whether we could destroy the tetraphenylborate in the surrogates or actual Tank 50H material either by use of Fenton's Reagent or by hydrolysis (in Tank 50H conditions at a maximum temperature of 50 degrees C) under a range of conditions. The results of these tests showed that destruction of the solids occurred only under a minority of conditions. (1)Using Fenton's Reagent and KTPB as the Tank 50H surrogate, no reaction occurred at pH ranges greater than 9. (2)Using Fenton's Reagent and phenol as the Tank 50H surrogate, no reaction occurred at a pH of 14. (3)Using Fenton's Reagent and actual Tank 50H slurry, a reaction occurred at a pH of 9.5 in the presence of ECC additives. (4)Using Fenton's Reagent and actual Tank 50H slurry, after a thirty three day period, all attempts at hydrolysis (at pH 14) were too slow to be viable. This happened even in the case of higher temperature (50 degrees C) and added (100 ppm) copper. Tank 50H is scheduled to return to HLW Tank Farm service with capabilities of …
Date:
October 3, 2003
Creator:
Peters, T.B.
Object Type:
Report
System:
The UNT Digital Library
The Kinetics of Dissociations of Aluminum - Oxygen Bonds in Aqueous Complexes - An NMR Study
OAK B262 The Kinetics of Dissociations of Aluminum--Oxygen Bonds in Aqueous Complexes--An NMR Study. In this project we determined rates and mechanisms of Al(III)-O bond rupture at mineral surfaces and in dissolved aluminum complexes. We then compared the experimental results to simulations in an attempt to predict rate coefficients. Most of the low-temperature reactions that are geochemically important involve a bonded atom or molecule that is replaced with another. We probe these reactions at the most fundamental level in order to establish a model to predict rates for the wide range of reactions that cannot be experimentally studied. The chemistry of small aluminum cluster (Figure) provides a window into the hydrolytic processes that control rates of mineral formation and the transformation of adsorbates into extended structures. The molecule shown below as an example exposes several types of oxygens to the bulk solution including seven structurally distinct sets of bridging hydroxyls. This molecule is a rich model for the aqueous interface of aluminum (hydr)oxide minerals, since it approaches colloidal dimensions in size, yet is a dissolved complex with +18 charge. We have conducted both {sup 17}O- {sup 27}Al- and {sup 19}F-NMR experiments to identify the reactive sites and to determine the …
Date:
September 3, 2003
Creator:
Casey, Dr. William
Object Type:
Report
System:
The UNT Digital Library
IRIS Final Technical Progress Report
OAK-B135 This NERI project, originally started as the Secure Transportable Autonomous Light Water Reactor (STAR-LW) and currently known as the International Reactor Innovative and Secure (IRIS) project, had the objective of investigating a novel type of water-cooled reactor to satisfy the Generation IV goals: fuel cycle sustainability, enhanced reliability and safety, and improved economics. The research objectives over the three-year (1999-2002) program were as follows: First year: Assess various design alternatives and establish main characteristics of a point design; Second year: Perform feasibility and engineering assessment of the selected design solutions; Third year: Complete reactor design and performance evaluation, including cost assessment These objectives were fully attained and actually they served to launch IRIS as a full fledged project for eventual commercial deployment. The program did not terminate in 2002 at the end of the NERI program, and has just entered in its fifth year. This has been made possible by the IRIS project participants which have grown from the original four member, two-countries team to the current twenty members, nine countries consortium. All the consortium members work under their own funding and it is estimated that the value of their in-kind contributions over the life of the project has …
Date:
November 3, 2003
Creator:
Carelli, M. D.
Object Type:
Report
System:
The UNT Digital Library