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[Dallas arts gala meetings]
Video footage from The Black Academy of Arts and Letters recorded during the meetings for the Dallas Arts Gala Benefit to be held in July of 2004 at the Dallas Convention Center. The planning meetings took place on June 4th and July 4th and involve the committees.
Date:
[2004-06-04,2004-07-04]
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 21, No. 4, Ed. 1 Friday, June 4, 2004
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
June 4, 2004
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
DART takes you to great art
News release promoting the use of DART and Trinity Railway Express services to travel to several DFW-area museums, where discounts on admission are available with a valid ticket or pass as part of DART's "destination deals" program.
Date:
March 4, 2004
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
Data Mining: Federal Efforts Cover a Wide Range of Uses
A letter report issued by the General Accounting Office with an abstract that begins "Both the government and the private sector are increasingly using "data mining"--that is, the application of database technology and techniques (such as statistical analysis and modeling) to uncover hidden patterns and subtle relationships in data and to infer rules that allow for the prediction of future results. As has been widely reported, many federal data mining efforts involve the use of personal information that is mined from databases maintained by public as well as private sector organizations. GAO was asked to survey data mining systems and activities in federal agencies. Specifically, GAO was asked to identify planned and operational federal data mining efforts and describe their characteristics."
Date:
May 4, 2004
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Demonstration of an Instrument for On-Line Measuring of the Alpha Radiation
The Salt Waste Processing Facility and the Actinide Removal Process at the Savannah River Site will remove alpha emitting radioisotopes from High Level Waste to meet regulatory disposal requirements. The removal occurs prior to removal of the radioactive cesium. Both facility designs currently include verification measurement using conventional wet chemistry approaches remote from the operation. Use of an on-line monitor for this purpose offers the opportunity to shorten process cycle time and thereby increase facility throughput. Personnel from Pacific Northwest National Laboratory designed, built, and functionally tested an on-line monitor, which is capable of measuring the residual transuranic concentrations in processed high-level wastes with a detection limit of 370 Bq/mL (10 nCi/mL) in less than six hours. Personnel from Savannah River National Laboratory assisted in the design and tested the equipment using actual waste. The monitor measures the neutrons produced by the transuranics in the presence of gamma-ray fields up to 1 Sv/h (100 R/h). The optimum design derives in part from Monte Carlo modeling tempered with practical engineering and cost considerations. We demonstrated operation of the monitor in a cell utilizing an actual sample of high-level waste. Results of that demonstration are given, and suggestions for improvements in the …
Date:
August 4, 2004
Creator:
BARNES, MARKJ.
Object Type:
Report
System:
The UNT Digital Library
Design and Construction of Main Group Element-Containing Molecules and Molecule-Derived Materials With Unusual Electronic, Optical, and Magnetic Properties
This program was successful in achieving its primary objectives. Namely, succeeded in the development of multiple synthetic routes to a wide variety of new candidate CVD precursor compounds.
Date:
August 4, 2004
Creator:
Diel, B. N.
Object Type:
Report
System:
The UNT Digital Library
Detecting DNA regulatory motifs by incorporating positional trendsin information content
On the basis of the observation that conserved positions in transcription factor binding sites are often clustered together, we propose a simple extension to the model-based motif discovery methods. We assign position-specific prior distributions to the frequency parameters of the model, penalizing deviations from a specified conservation profile. Examples with both simulated and real data show that this extension helps discover motifs as the data become noisier or when there is a competing false motif.
Date:
May 4, 2004
Creator:
Kechris, Katherina J.; van Zwet, Erik; Bickel, Peter J. & Eisen,Michael B.
Object Type:
Article
System:
The UNT Digital Library
Development of Chemical Treatment Alternatives for Tetraphenylborate Destruction in Tank 48H
This study assessed chemical treatment options for decomposing the tetraphenylborate in High Level Waste (HLW) Tank 48H. Tank 48H, located at the Savannah River Site in Aiken, SC, contains approximately one million liters of HLW. The tetraphenylborate slurry represents legacy material from commissioning of an In Tank Precipitation process to separate radioactive cesium and actinides from the non radioactive chemicals. During early operations, the process encountered an unplanned chemical reaction that catalytically decomposed the excess tetraphenylborate producing benzene. Subsequent research indicated that personnel could not control the operations within the existing equipment to both meet the desired treatment rate for the waste and maintain the benzene concentration within allowable concentrations. Since then, the Department of Energy selected an alternate treatment process for handling high-level waste at the site. However, the site must destroy the tetraphenylborate before returning the tank to HLW service. The research focuses on identifying treatments to decompose tetraphenylborate to the maximum extent feasible, with a preference for decomposition methods that produce carbon dioxide rather than benzene. A number of experiments examined whether the use of oxidants, catalysts or acids proved effective in decomposing the tetraphenylborate. Additional experiments developed an understanding of the solid, liquid and gas decomposition …
Date:
May 4, 2004
Creator:
Lambert, Daniel P.
Object Type:
Article
System:
The UNT Digital Library
Development of odd-Z-projectile reactions for transactinide element synthesis
The development of new odd-Z-projectile reactions leading to the production of transactinide elements is described. The cross section of the even-Z-projectile 208Pb(64Ni, n)271Ds reaction was measured at two new energies using the Berkeley Gas-filled Separator at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. In total, seven decay chains attributable to 271Ds were observed. These data, combined with previous results, establish an excitation function for the production of 271Ds. The maximum cross section was 20 +15 -11 pb at a center-of-target energy of 311.5 MeV in the laboratory frame.The data from the 271Ds experiments were used to estimate the optimum beam energy for the new odd-Z-projectile 208Pb(65Cu, n)272-111 reaction using the Fusion by Diffusion theory proposed by Swiatecki, Siwek-Wilczynska, and Wilczynski. A cross section for this reaction was measured for the first time, at a center-of-target energy of 321.1 MeV in the laboratory frame. The excitation energy f or compound nuclei formed at the target center was 13.2 MeV. One decay chain was observed, resulting in a measured cross section of 1.7 +3.9 -1.4 pb. This decay chain is in good agreement with previously published data on the decay of 272-111.The new odd-Z-projectile 208Pb(55Mn, n)262Bh reaction was studied at three different …
Date:
November 4, 2004
Creator:
Folden III, Charles Marvin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Dietary Supplements: Ephedra
This report will attempt to clarify the current regulatory status of dietary supplement products containing ephedra.
Date:
February 4, 2004
Creator:
Porter, Donna V.
Object Type:
Report
System:
The UNT Digital Library
Digestion of Crystalline Silicotitanate (CST)
Researchers tested methods for chemically dissolving crystalline silicotitanate (CST) as a substitute for mechanical grinding to reduce particle size before vitrification. Testing used the commercially available form of CST, UOP IONSIV(R) IE-911. Reduction of the particle size to a range similar to that of the glass frit used by the Defense Waste Processing Facility (DWPF) could reduce problems with coupling cesium ion exchange to the vitrification process. This study found that IONSIV(R) IE-911 dissolves completely using a combination of acid, hydrogen peroxide, and fluoride ion. Neutralization of the resulting acidic solution precipitates components of the IONSIV(R) IE-911. Digestion requires extremely corrosive conditions. Also, large particles may reform during neutralization, and the initiation and rate of gas generation are unpredictable. Therefore, the method is not recommended as a substitute for mechanical grinding.
Date:
November 4, 2004
Creator:
Walker, Darrel
Object Type:
Report
System:
The UNT Digital Library
Direct Determination of the Equilibrium Unbinding Potential Profile for a Short DNA Duplex from Force Spectroscopy Data
Modern force microscopy techniques allow researchers to use mechanical forces to probe interactions between biomolecules. However, such measurements often happen in non-equilibrium regime, which precludes straightforward extraction of the equilibrium energy information. Here we use the work averaging method based on Jarzynski equality to reconstruct the equilibrium interaction potential from the unbinding of a complementary 14-mer DNA duplex from the results of non-equilibrium single-molecule measurements. The reconstructed potential reproduces most of the features of the DNA stretching transition, previously observed only in equilibrium stretching of long DNA sequences. We also compare the reconstructed potential with the thermodynamic parameters of DNA duplex unbinding and show that the reconstruction accurately predicts duplex melting enthalpy.
Date:
May 4, 2004
Creator:
Noy, A
Object Type:
Article
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 27, Ed. 1 Thursday, March 4, 2004
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Citizen (Dublin, Tex.), Vol. 15, No. 10, Ed. 1 Thursday, November 4, 2004
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
November 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
E781 Hyperon Spectrometer Constants
This is a discussion of the physical measurements, sizes, distances and magnetic fields of the Hyperon Spectrometer Magnet and its components. Some we get from construction drawings (like the target dimensions) and others from measurements in differing coordinate systems. Included also are the properties of the hyperon productions targets used in E781.
Date:
May 4, 2004
Creator:
Lach, Joseph T.
Object Type:
Report
System:
The UNT Digital Library
An efficient method for calculating maxima of symmetric homogeneous functions of orthogonal matrices: Applications to localized occupied orbitals
The authors present here three new algorithms (one purely iterative and two DIIS-like) to compute maxima of symmetric homogeneous functions of orthogonal matrices. These algorithms revolve around the mathematical lemma that, given an invertible matrix A, the function f(U) = Tr(AU) has exactly one local (and global) maximum for U special orthogonal (i.e. UU{sup T} = 1 and det(U) = 1). This is proved in the appendix. One application of these algorithms is the computation of localized orbitals, including, for example, Boys and Edmiston-Reudenberg (ER) orbitals. The Boys orbitals are defined as the set of orthonormal orbitals which, for a given vector space of orbitals, maximize the sum of the distances between orbital centers. The ER orbitals maximize total self-interaction energy. The algorithm presented here computes Boys orbitals roughly as fast as the traditional method (Jacobi sweeps), while, for large systems, it finds ER orbitals potentially much more quickly than traditional Jacobi sweeps. In fact, the required time for convergence of the algorithm scales quadratically in the region of a few hundred basis functions (though cubicly asymptotically), while Jacobi sweeps for the ER orbitals traditionally scale as the number of occupied orbitals to the fifth power. As an example of …
Date:
June 4, 2004
Creator:
Subotnik, Joseph E.; Shao, Yihan; Liang, WanZhen & Head-Gordon, Martin
Object Type:
Article
System:
The UNT Digital Library
Electra Star-News (Electra, Tex.), Vol. 98, No. 12, Ed. 1 Thursday, November 4, 2004
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
November 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 98, No. 34, Ed. 1 Thursday, March 4, 2004
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
ELMs and the H-Mode Pedestal in NSTX
We report on the behavior of ELMs in NBI-heated H-mode plasmas in NSTX. It is observed that the size of Type I ELMs, characterized by the change in plasma energy, decreases with increasing density, as observed at conventional aspect ratio. It is also observed that the Type I ELM size decreases as the plasma equilibrium is shifted from a symmetric double-null toward a lower single-null configuration. Type III ELMs have also been observed in NSTX, as well as a high-performance regime with small ELMs which we designate Type V. These Type V ELMs are consistent with high bootstrap current operation and density approaching Greenwald scaling. The Type V ELMs are characterized by an intermittent n=1 MHD mode rotating counter to the plasma current. Without active pumping, the density rises continuously through the Type V phase. However, efficient in-vessel pumping should allow density control, based on particle containment time estimates.
Date:
June 4, 2004
Creator:
Maingi, R.; Sabbagh, S.; Bush, C.; Fredrickson, E.; Menard, J.; Stutman, D. et al.
Object Type:
Article
System:
The UNT Digital Library
[Email from Jill Waterston to Allen J. about campaign event]
Email from Jill Waterston to Allen J. on June 4, 2004, discussing SDEC campaign event.
Date:
June 4, 2004
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Engineering Spectral Control Using Front Surface Filters for Maximum TPV Energy Conversion System Performance
Energy conversion efficiencies of better than 23% have been demonstrated for small scale tests of a few thermophotovoltaic (TPV) cells using front surface, tandem filters [1,2]. The engineering challenge is to build this level of efficiency into arrays of cells that provide useful levels of energy. Variations in cell and filter performance will degrade TPV array performance. Repeated fabrication runs of several filters each provide an initial quantification of the fabrication variation for front surface, tandem filters for TPV spectral control. For three performance statistics, within-run variation was measured to be 0.7-1.4 percent, and run-to-run variation was measured to be 0.5-3.2 percent. Fabrication runs using a mask have been shown to reduce variation across interference filters from as high 8-10 percent to less than 1.5 percent. Finally, several system design and assembly approaches are described to further reduce variation.
Date:
August 4, 2004
Creator:
Rahmlow, T. D., Jr.; Lazo-Wasem, J. E.; Gratrix, E. J.; Azarkevich, J. J.; Brown, E. J.; DePoy, D. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Enhancing the Safety and Security of Radioactive Sources
This presentation discusses enhancing the safety and security of radioactive sources.
Date:
October 4, 2004
Creator:
Hickey, J.
Object Type:
Presentation
System:
The UNT Digital Library
Environmental Disclosure: Briefing on GAO's Findings and Recommendations
Correspondence issued by the Government Accountability Office with an abstract that begins "The Securities and Exchange Commission's (SEC) primary mission is to protect investors and the integrity of securities markets. Among other things, SEC regulations require companies to file reports with SEC disclosing information that would be considered "material" to a reasonable investor. A matter is material if there is a substantial likelihood that a reasonable person would consider it important. Environmental risks and liabilities are among the conditions that, if undisclosed, could impair the public's ability to make sound investment decisions. For example, the discovery of extensive hazardous waste contamination at company-owned facilities could expose a company to hundreds of millions of dollars in cleanup costs, while impending environmental regulations could affect a company's future financial position if the company were required to shut down plants or invest in expensive new technology. To monitor companies' disclosures, SEC reviews their filings and issues comment letters requesting revisions or additional information, if needed. Although the Environmental Protection Agency (EPA) does not have a direct role in monitoring environmental disclosures, the agency notifies companies of potential disclosure obligations and periodically shares relevant information with SEC. The report addresses (1) key stakeholders' views …
Date:
August 4, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
EPA's Radioactive Source Program
This presentation discusses the U.S. Environmental Protection Agency's (EPA) Radioactive Source Program.
Date:
October 4, 2004
Creator:
Kopsick, D.
Object Type:
Presentation
System:
The UNT Digital Library