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445 Matching Results
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Soft X-ray emission spectroscopy of liquids and lithium batterymaterials
Lithium ion insertion into electrode materials is commonly used in rechargeable battery technology. The insertion implies changes in both the crystal structure and the electronic structure of the electrode material. Side-reactions may occur on the surface of the electrode which is exposed to the electrolyte and form a solid electrolyte interface (SEI). The understanding of these processes is of great importance for improving battery performance. The chemical and physical properties of water and alcohols are complicated by the presence of strong hydrogen bonding. Various experimental techniques have been used to study geometrical structures and different models have been proposed to view the details of how these liquids are geometrically organized by hydrogen bonding. However, very little is known about the electronic structure of these liquids, mainly due to the lack of suitable experimental tools. In this thesis examples of studies of lithium battery electrodes and liquid systems using soft x-ray emission spectroscopy will be presented. Monochromatized synchrotron radiation has been used to accomplish selective excitation, in terms of energy and polarization. The electronic structure of graphite electrodes has been studied, before and after lithium intercalation. Changes in the electronic structure upon lithiation due to transfer of electrons into the graphite …
Date:
October 27, 2004
Creator:
Augustsson, Andreas
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Source-Search Sensitivity of a Large-Area, Coded-Aperture, Gamma-Ray Imager
We have recently completed a large-area, coded-aperture, gamma-ray imager for use in searching for radiation sources. The instrument was constructed to verify that weak point sources can be detected at considerable distances if one uses imaging to overcome fluctuations in the natural background. The instrument uses a rank-19, one-dimensional coded aperture to cast shadow patterns onto a 0.57 m{sup 2} NaI(Tl) detector composed of 57 individual cubes each 10 cm on a side. These are arranged in a 19 x 3 array. The mask is composed of four-centimeter thick, one-meter high, 10-cm wide lead blocks. The instrument is mounted in the back of a small truck from which images are obtained as one drives through a region. Results of first measurements obtained with the system are presented.
Date:
October 27, 2004
Creator:
Ziock, K P; Collins, J W; Craig, W W; Fabris, L; Lanza, R C; Gallagher, S et al.
Object Type:
Article
System:
The UNT Digital Library
The Supersymmetric Fat Higgs
Supersymmetric models have traditionally been assumed to be perturbative up to high scales due to the requirement of calculable unification. In this note I review the recently proposed `Fat Higgs' model which relaxes the requirement of perturbativity. In this framework, an NMSSM-like trilinear coupling becomes strong at some intermediate scale. The NMSSM Higgses are meson composites of an asymptotically-free gauge theory. This allows us to raise the mass of the Higgs, thus alleviating the MSSM of its fine tuning problem. Despite the strong coupling at an intermediate scale, the UV completion allows us to maintain gauge coupling unification.
Date:
October 27, 2004
Creator:
Harnik, Roni
Object Type:
Article
System:
The UNT Digital Library
Texas Attorney General Opinion: GA-0264
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether the Port Arthur Economic Development Corporation may grant funds and refund sales taxes to a private corporation (RQ-0218-GA)
Date:
October 27, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 34, No. 7, Ed. 1 Wednesday, October 27, 2004
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
October 27, 2004
Creator:
Dickens, Jodi
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 81, No. 15, Ed. 1 Wednesday, October 27, 2004
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
October 27, 2004
Creator:
Show, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
VÄ›stnÃk (Temple, Tex.), Vol. 92, No. 41, Ed. 1 Wednesday, October 27, 2004
Weekly Czech and English language newspaper from Temple, Texas published as the official organ of the Slavonic Benevolent Order of the State of Texas that includes news of interest to members along with advertising.
Date:
October 27, 2004
Creator:
Zavodny, Melanie
Object Type:
Newspaper
System:
The Portal to Texas History
Waste Form Features, Events, and Processes
The purpose of this report is to evaluate and document the inclusion or exclusion of the waste form features, events and processes (FEPs) with respect to modeling used to support the Total System Performance Assessment for License Application (TSPA-LA). A screening decision, either Included or Excluded, is given for each FEP along with the technical bases for screening decisions. This information is required by the Nuclear Regulatory Commission (NRC) in 10 CFR 63.114 (d, e, and f) [DIRS 156605]. The FEPs addressed in this report deal with the issues related to the degradation and potential failure of the waste form and the migration of the waste form colloids. For included FEPs, this analysis summarizes the implementation of the FEP in TSPA-LA, (i.e., how the FEP is included). For excluded FEPs, this analysis provides the technical bases for exclusion from TSPA-LA (i.e., why the FEP is excluded). This revision addresses the TSPA-LA FEP list (DTN: MO0407SEPFEPLA.000 [DIRS 170760]). The primary purpose of this report is to identify and document the analyses and resolution of the features, events, and processes (FEPs) associated with the waste form performance in the repository. Forty FEPs were identified that are associated with the waste form performance. …
Date:
October 27, 2004
Creator:
Schreiner, R.
Object Type:
Report
System:
The UNT Digital Library
3-D Combinatorial Geometry in the MERCURY Monte Carlo Particle Transport Code
Lawrence Livermore National Laboratory is in the process of developing a new Monte Carlo Particle Transport code named MERCURY. This new code features a 3-D Combinatorial Geometry tracking algorithm. This paper details some of the characteristics of this Monte Carlo tracker
Date:
September 27, 2004
Creator:
Greenman, G
Object Type:
Article
System:
The UNT Digital Library
9/11 Commission Recommendations: Intelligence Budget
This report identifies the main recommendations of the 9/11 Commission with respect to the intelligence budget. This report also describes the intelligence budget process under current law to explain the effect of these recommendations and presents the current budget authorities of the Director of Central Intelligence, as well as budget provisions in two bills, S. 2774 and H.R. 5040, that include all Commission recommendations.
Date:
September 27, 2004
Creator:
Nicola, Thomas J.
Object Type:
Report
System:
The UNT Digital Library
Advanced Reactor Licensing: Experience with Digital I&C Technology in Evolutionary Plants
This report presents the findings from a study of experience with digital instrumentation and controls (I&C) technology in evolutionary nuclear power plants. In particular, this study evaluated regulatory approaches employed by the international nuclear power community for licensing advanced l&C systems and identified lessons learned. The report (1) gives an overview of the modern l&C technologies employed at numerous evolutionary nuclear power plants, (2) identifies performance experience derived from those applications, (3) discusses regulatory processes employed and issues that have arisen, (4) captures lessons learned from performance and regulatory experience, (5) suggests anticipated issues that may arise from international near-term deployment of reactor concepts, and (6) offers conclusions and recommendations for potential activities to support advanced reactor licensing in the United States.
Date:
September 27, 2004
Creator:
Wood, RT
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 153, Ed. 1 Monday, September 27, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 27, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 114, No. 78, Ed. 1 Monday, September 27, 2004
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
September 27, 2004
Creator:
Schwind, Jim & Looby, Edward
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 298, Ed. 1 Monday, September 27, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 27, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Chlorinated Hydrocarbon Degradation in Plants: Mechanisms and Enhancement of Phytoremediation of Groundwater Contamination
The research objectives for this report are: (1) Transform poplar and other tree species to extend and optimize chlorinated hydrocarbon (CHC) oxidative activities. (2) Determine the mechanisms of CHC oxidation in plants. (3) Isolate the genes responsible for CHC oxidation in plants. We have made significant progress toward an understanding of the biochemical mechanism of CHC transformation native to wild-type poplar. We have identified chloral, trichloroethanol, trichloroacetic acid, and dichloroacetic acid as products of TCE metabolism in poplar plants and in tissue cultures of poplar cells.(Newman et al. 1997; Newman et al. 1999) Use of radioactively labeled TCE showed that once taken up and transformed, most of the TCE was incorporated into plant tissue as a non-volatile, unextractable residue.(Shang et al. 2001; Shang and Gordon 2002) An assay for this transformation was developed and validated using TCE transformation by poplar suspension cells. Using this assay, it was shown that two different activities contribute to the fixation of TCE by poplar cells: one associated with cell walls and insoluble residues, the other associated with a high molecular weight, heat labile fraction of the cell extract, a fixation that was apparently catalyzed by plant enzymes.
Date:
September 27, 2004
Creator:
Strand, Stuart
Object Type:
Report
System:
The UNT Digital Library
Controlling the electronic structure of nanocrystal assemblies by variation of the particle - particle interaction
The change in the electronic structure of germanium nanocrystals is investigated as their concentration is increased from non-interacting, individual particles to assembled arrays of particles. The electronic structure of the individual nanoclusters shows clear effects due to quantum confinement which are lost in the concentrated assemblies of bare particles. When the surface of the individual particles is passivated, they retain their quantum confinement properties also upon assembly. These effects are interpreted in terms of a particle - particle interaction model.
Date:
September 27, 2004
Creator:
Bostedt, C; van Buuren, T; Willey, T M & Terminello, L J
Object Type:
Article
System:
The UNT Digital Library
Development of a Catalyst/Sorbent for Methane Reforming
This work has led to the initial development of a very promising material that has the potential to greatly simplify hydrocarbon reforming for the production of hydrogen and to improve the overall efficiency and economics of the process. This material, which was derived from an advanced calcium-based sorbent, was composed of core-in-shell pellets such that each pellet consisted of a CaO core and an alumina-based shell. By incorporating a nickel catalyst in the shell, a combined catalyst and sorbent was prepared to facilitate the reaction of hydrocarbons with steam. It was shown that this material not only catalyzes the reactions of methane and propane with steam, it also absorbs CO{sub 2} simultaneously, and thereby separates the principal reaction products, H{sub 2} and CO{sub 2}. Furthermore, the absorption of CO{sub 2} permits the water gas shift reaction to proceed much further towards completion at temperatures where otherwise it would be limited severely by thermodynamic equilibrium. Therefore, an additional water gas shift reaction step would not be required to achieve low concentrations of CO. In a laboratory test of methane reforming at 600 C and 1 atm it was possible to produce a gaseous product containing 96 mole% H{sub 2} (dry basis) …
Date:
September 27, 2004
Creator:
Shanks, B. H.; Wheelock, T. D.; Satrio, Justinus A.; Diehl, Timothy & Vollmer, Brigitte
Object Type:
Report
System:
The UNT Digital Library
Dynamic Testing of Gasifier Refractory
The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) is being utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. Shakedown testing of the CADCAF has been completed. Samples of slag and refractory from the Tampa Electric Polk Power Station have been obtained for testing in the CADCAF. The slag has been dried and sieved to the size needed for our flowing slag corrosion tests. Screening tests are in currently in progress. Detailed analysis of corrosion rates from the first tests is in progress.
Date:
September 27, 2004
Creator:
Mann, Michael D.; Shukla, Devdutt; Hong, Xi & Hurley, John P.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, September 27, 2004
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 27, 2004
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Faculty Recital: 2004-09-27 - Charles Veazey, oboe and Jean Mainous, piano
Access:
Use of this item is restricted to the UNT Community
Recital performed at UNT College of Music Recital Hall on September 27, 2004 at 8:00 pm.
Date:
September 27, 2004
Creator:
Veazey, Charles & Mainous, Jean
Object Type:
Sound
System:
The UNT Digital Library
Financial Institution Customer Identification Programs Mandated by the USA PATRIOT Act
None
Date:
September 27, 2004
Creator:
Murphy, M. Maureen
Object Type:
Report
System:
The UNT Digital Library
Financial Market Preparedness: Improvements Made, but More Action Needed to Prepare for Wide-Scale Disasters
A letter report issued by the Government Accountability Office with an abstract that begins "In February 2003 reports, GAO identified actions needed to better prepare critical financial market participants for wide-scale disasters, such as terrorist attacks. To determine progress made since then, GAO assessed (1) actions that critical securities market organizations took to improve their ability to prevent and recover from disruptions, (2) actions that financial market and telecommunications industry participants took to improve telecommunications resiliency, (3) financial regulators' efforts to ensure the resiliency of the financial markets; and (4) SEC's efforts to improve its program for overseeing operations risks at certain market participants."
Date:
September 27, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
H.R. 1417: The Copyright Royalty and Distribution Reform Act of 2004
H.R. 1417, 108th Congress, first session, was introduced on March 25, 2003 and passed by the House on March 3, 2004. If enacted, this bill would make extensive changed to the procedural framework for adjudicating royalty rates for compulsory licenses under the Copyright Act. This report details the background and legislative action on the Copyright Royalty and Distribution Reform Act of 2004.
Date:
September 27, 2004
Creator:
Jeweler, Robin
Object Type:
Report
System:
The UNT Digital Library
HIV/AIDS International Programs: Appropriations, FY2003-FY2005
The Administration's FY2005 request for international HIV/AIDS, tuberculosis, and malaria programs totals about $2.8 billion, as compared with $2.4 billion appropriated for FY2004. The FY2005 request includes a large increase for the bilateral Global AIDS Initiative, headquartered at the Department of State, while the request for the Global Fund to Fight AIDS, Tuberculosis, and Malaria is $200 million, compared with $546.7 million appropriated in FY2004.
Date:
September 27, 2004
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library