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Radio Communications: Congressional Action Needed to Ensure Agencies Collaborate to Develop a Joint Solution
A letter report issued by the Government Accountability Office with an abstract that begins "The Integrated Wireless Network (IWN) was intended to be a collaborative effort among the Departments of Justice (DOJ), Homeland Security (DHS), and the Treasury to provide secure, seamless, interoperable, and reliable nationwide wireless communications in support of federal agents and officers engaged in law enforcement, protective services, homeland defense, and disaster response missions. GAO was asked to determine the extent to which the three departments are developing a joint radio communications solution. To address this objective, GAO reviewed and analyzed relevant documentation and interviewed department officials about the extent to which they are collaborating with the other departments on IWN or an alternative joint radio communications solution."
Date:
December 12, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Media Ownership: Economic Factors Influence the Number of Media Outlets in Local Markets, While Ownership by Minorities and Women Appears Limited and Is Difficult to Assess
A letter report issued by the Government Accountability Office with an abstract that begins "The media industry plays an important role in educating and entertaining the public. While the media industry provides the public with many national choices, media outlets located in a local market are more likely to provide local programs that meet the needs of residents in the market compared to national outlets. This report reviews (1) the number and ownership of various media outlets; (2) the level of minority- and women-owned broadcast outlets; (3) the influence of economic, legal and regulatory, and technological factors on the number and ownership of media outlets; and (4) stakeholders' opinions on modifying certain media ownership laws and regulations. GAO conducted case studies of 16 randomly sampled markets, stratified by population. GAO also interviewed officials from the Federal Communications Commission (FCC), the Department of Commerce, trade associations, and the industry. Finally, GAO reviewed FCC's forms, processes, and reports."
Date:
March 12, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Federal-Aid Highways: Federal Requirements for Highways May Influence Funding Decisions and Create Challenges, but Benefits and Costs Are Not Tracked
A letter report issued by the Government Accountability Office with an abstract that begins "As highway congestion continues to be a problem in many areas, states are looking to construct or expand highway projects. When a state department of transportation (DOT) receives federal funding for highway projects from the Federal Highway Administration (FHWA), the projects must comply with the National Environmental Policy Act (NEPA), the Davis-Bacon prevailing wage requirement, the Disadvantaged Business Enterprise (DBE) program, and the Buy America program. While complying with these requirements, states must use limited transportation dollars efficiently. As requested, GAO addressed (1) the types of benefits and costs associated with these requirements for federal-aid highway projects; (2) the influence of these federal requirements on states' decisions to use nonfederal or federal funds for highway projects; and (3) the challenges associated with the federal requirements and strategies used or proposed to address the challenges. To complete this work, GAO reviewed 30 studies, surveyed DOTs in all states and the District of Columbia, and interviewed transportation officials and other stakeholders."
Date:
December 12, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
The Voting Rights Act of 1965, As Amended: Its History and Current Issues
Several bills have been introduced in the 110th Congress concerning the Voting Rights Act of 1965 (VRA) that would rename the short title of the act, and address its bilingual provisions and issues of deceptive practices and voter intimidation during elections. This report discusses this issue at length and also addresses allegations of voting irregularities and of violations of the VRA during the presidential election of 2000.
Date:
June 12, 2008
Creator:
Laney, Garrine P.
Object Type:
Report
System:
The UNT Digital Library
Canada-U.S. Relations
This report provides a short overview of Canada's political scene, its economic conditions, and its recent security and foreign policy, focusing particularly on issues that may be relevant to U.S. policymakers. This brief country survey is followed by several summaries of current bilateral issues in the political, trade, and environmental arenas.
Date:
May 12, 2008
Creator:
Ek, Carl; Fergusson, Ian F.; Nuñez-Neto, Blas; Clarke, Stephen F.; Abel, Amy; Sheikh, Pervaze et al.
Object Type:
Report
System:
The UNT Digital Library
Expulsion and Censure Actions Taken by the Full Senate Against Members
The Senate has censured nine Senators for various misconduct, including conduct not a violation of any law or specific written Senate ethics rule, when such conduct is found contrary to "acceptable norms of ethical conduct in the Senate," contrary to "accepted morals" and "senatorial ethics," when found to "derogate from the public trust expected of a Senator," and/or found to be "reprehensible" conduct which brings the Senate into "dishonor and disrepute." Conduct resulting in Senate "censure" has included violating orders of secrecy of documents; fighting in the Senate ("censure"); allowing a lobbyist with interests in particular legislation to be on official staff with access to the secret considerations of the legislation by committee ("condemn"); non-cooperation and abuse of investigating committees of the Senate ("condemn"); financial irregularities concerning political contributions ("censure"), office expenses and contributions ("denounce"), and excessive honoraria, official reimbursements and gifts ("denounce").
Date:
November 12, 2008
Creator:
Maskell, Jack
Object Type:
Report
System:
The UNT Digital Library
TRITIUM EFFECTS ON DYNAMIC MECHANICAL PROPERTIES OF POLYMERIC MATERIALS
Dynamic mechanical analysis has been used to characterize the effects of tritium gas (initially 1 atm. pressure, ambient temperature) exposure over times up to 2.3 years on several thermoplastics-ultrahigh molecular weight polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), and Vespel{reg_sign} polyimide, and on several formulations of elastomers based on ethylene propylene diene monomer (EPDM). Tritium exposure stiffened the elastic modulus of UHMW-PE up to about 1 year and then softened it, and reduced the viscous response monotonically with time. PTFE initially stiffened, however the samples became too weak to handle after nine months exposure. The dynamic properties of Vespel{reg_sign} were not affected. The glass transition temperature of the EPDM formulations increased approximately 4 C. following three months tritium exposure.
Date:
November 12, 2008
Creator:
Clark, E
Object Type:
Article
System:
The UNT Digital Library
Discovering and validating biological hypotheses from coherent patterns in functional genomics data
The area of transcriptomics analysis is among the more established in computational biology, having evolved in both technology and experimental design. Transcriptomics has a strong impetus to develop sophisticated computational methods due to the large amounts of available whole-genome datasets for many species and because of powerful applications in regulatory network reconstruction as well as elucidation and modeling of cellular transcriptional responses. While gene expression microarray data can be noisy and comparisons across experiments challenging, there are a number of sophisticated methods that aid in arriving at statistically and biologically significant conclusions. As such, computational transcriptomics analysis can provide guidance for analysis of results from newer experimental technologies. More recently, search methods have been developed to identify modules of genes, which exhibit coherent expression patterns in only a subset of experimental conditions. The latest advances in these methods allow to integrate multiple data types anddatasets, both experimental and computational, within a single statistical framework accounting for data confidence and relevance to specific biological questions. Such frameworks provide a unified environment for the exploration of specific biological hypothesis and for the discovery of coherent data patterns along with the evidence supporting them.
Date:
August 12, 2008
Creator:
Joachimiak, Marcin Pawel
Object Type:
Presentation
System:
The UNT Digital Library
UNITED STATES DEPARTMENT OF ENERGY WASTE PROCESSING ANNUAL TECHNOLOGY DEVELOPMENT REPORT 2007
The Office of Environmental Management's (EM) Roadmap, U.S. Department of Energy--Office of Environmental Management Engineering & Technology Roadmap (Roadmap), defines the Department's intent to reduce the technical risk and uncertainty in its cleanup programs. The unique nature of many of the remaining facilities will require a strong and responsive engineering and technology program to improve worker and public safety, and reduce costs and environmental impacts while completing the cleanup program. The technical risks and uncertainties associated with cleanup program were identified through: (1) project risk assessments, (2) programmatic external technical reviews and technology readiness assessments, and (3) direct site input. In order to address these needs, the technical risks and uncertainties were compiled and divided into the program areas of: Waste Processing, Groundwater and Soil Remediation, and Deactivation and Decommissioning (D&D). Strategic initiatives were then developed within each program area to address the technical risks and uncertainties in that program area. These strategic initiatives were subsequently incorporated into the Roadmap, where they form the strategic framework of the EM Engineering & Technology Program. The EM-21 Multi-Year Program Plan (MYPP) supports the goals and objectives of the Roadmap by providing direction for technology enhancement, development, and demonstrations that will lead to …
Date:
August 12, 2008
Creator:
Bush, S
Object Type:
Report
System:
The UNT Digital Library
Coupling of the 4f Electrons in Lanthanide Molecules
(C5Me5)2LnOTf where Ln = La, Ce, Sm, Gd, and Yb have been synthesized and these derivatives are good starting materials for the synthesis of (C5Me5)2LnX derivatives. (C5Me5)2Ln(2,2'-bipyridine), where Ln = La, Ce, Sm, and Gd, along with several methylated bipyridine analogues have been synthesized and their magnetic moments have been measured as a function of temperature. In lanthanum, cerium, and gadolinium complexes the bipyridine ligand ligand is unequivocally the radical anion, and the observed magnetic moment is the result of intramolecular coupling of the unpaired electron on the lanthanide fragment with the unpaired electron on the bipyridine along with the intermolecular coupling between radicals. Comparison with the magnetic moments of the known compounds (C5Me5)2Sm(2,2'-bipyridine) and (C5Me5)2Yb(2,2'-bipyridine) leads to an understanding of the role of the Sm(II)/Sm(III) and Yb(II)/Yb(III) couple in the magnetic properties of (C5Me5)2Sm(2,2'-bipyridine) and (C5Me5)2Yb(2,2'-bipyridine). In addition, crystal structures of (C5Me5)2Ln(2,2'-bipyridine) and [(C5Me5)2Ln(2,2'-bipyridine)][BPh4](Ln= Ce and Gd), where the lanthanide is unequivocally in the +3 oxidation state, give the crystallographic characteristics of bipyridine as an anion and as a neutral ligand in the same coordination environment, respectively. Substituted bipyridine ligands coordinated to (C5Me5)2Yb are studied to further understand how the magnetic coupling in (C5Me5)2Yb(2,2'-bipyridine) changes with substitutions. In the …
Date:
September 12, 2008
Creator:
Kazhdan, Daniel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Breakdown Characteristics Study on an 18 Cell X-band Structure
A CLIC designed 18 cells, low group velocity (2.4% to 1.0% c), X-band (11.4 GHz) accelerator structure (denoted T18) was designed at CERN, its cells were built at KEK, and it was assembled and tested at SLAC. An interesting feature of this structure is that the gradient in the last cell is about 50% higher than that in the first cell. This structure has been RF conditioned at SLAC NLCTA for about 1400 hours where it incurred about 2200 breakdowns. This paper presents the characteristics of these breakdowns, including (1) the breakdown rate dependence on gradient, pulse width and conditioning time, (2) the breakdown distribution along the structure, (3) relation between breakdown and pulsed heating dependence study and (4) electric field decay time for breakdown changing over the whole conditioning time. Overall, this structure performed very well, having a final breakdown rate of less than 1e-6/pulse/m at 106 MV/m with 230 ns pulse width.
Date:
November 12, 2008
Creator:
Wang, Faya
Object Type:
Article
System:
The UNT Digital Library
Final Report DE-FG02-97ER62475
This project began with the simple goal of trying to understand the diversity of dissimilatory metal-reducing microorganisms that might be found in subsurface environments. It ended with a sophisticated understanding not only of what microorganisms are important for metal reduction in uranium-contaminated subsurface environments, but also their physiological status during in situ uranium bioremediation. These findings have provided unprecedented insight into uranium bioremediation and the methods by which this process might be optimized. A brief summary of the major accomplishments of the project is given.
Date:
March 12, 2008
Creator:
Lovley, Derek, R.
Object Type:
Report
System:
The UNT Digital Library
RADIATION EFFECTS ON EPOXY/CARBON FIBER COMPOSITE
The Department of Energy Savannah River Site vitrifies nuclear waste incident to defense programs through its Defense Waste Processing Facility (DWPF). The piping in the DWPF seal pot jumper configuration must withstand the stresses during an unlikely but potential deflagration event, and maintain its safety function for a 20-year service life. Carbon fiber-reinforced epoxy composites (CFR) were proposed for protection and reinforcement of piping during such an event. The proposed CFR materials have been ASME-approved (Section XI, Code Case N-589-1) for post-construction maintenance and is DOT-compliant per 49CFR 192 and 195. The proposed carbon fiber/epoxy composite reinforcement system was originally developed for pipeline rehabilitation and post-construction maintenance in petrochemical, refineries, DOT applications and other industries. The effects of ionizing radiation on polymers and organic materials have been studied for many years. The majority of available data are based on traditional exposures to gamma irradiation at high dose rates ({approx}10,000 Gy/hr) allowing high total dose within reasonable test periods and general comparison of different materials exposed at such conditions. However, studies in recent years have shown that degradation of many polymers are sensitive to dose rate, with more severe degradation often observed at similar or even lower total doses when exposed …
Date:
December 12, 2008
Creator:
Hoffman, E & Eric Skidmore, E
Object Type:
Article
System:
The UNT Digital Library
Anthrax Sampling and Decontamination: Technology Trade-Offs
The goal of this project was to answer the following questions concerning response to a future anthrax release (or suspected release) in a building: 1. Based on past experience, what rules of thumb can be determined concerning: (a) the amount of sampling that may be needed to determine the extent of contamination within a given building; (b) what portions of a building should be sampled; (c) the cost per square foot to decontaminate a given type of building using a given method; (d) the time required to prepare for, and perform, decontamination; (e) the effectiveness of a given decontamination method in a given type of building? 2. Based on past experience, what resources will be spent on evaluating the extent of contamination, performing decontamination, and assessing the effectiveness of the decontamination in abuilding of a given type and size? 3. What are the trade-offs between cost, time, and effectiveness for the various sampling plans, sampling methods, and decontamination methods that have been used in the past?
Date:
September 12, 2008
Creator:
Price, Phillip N.; Hamachi, Kristina; McWilliams, Jennifer & Sohn, Michael D.
Object Type:
Report
System:
The UNT Digital Library
Preconceptual Design Description for Caustic Recycle Facility
The U.S. Department of Energy plans to vitrify both high-level and low-activity waste at the Hanford Site in southeastern Washington State. One aspect of the planning includes a need for a caustic recycle process to separate sodium hydroxide for recycle. Sodium is already a major limitation to the waste-oxide loading in the low-activity waste glass to be vitrified at the Waste Treatment Plant, and additional sodium hydroxide will be added to remove aluminum and to control precipitation in the process equipment. Aluminum is being removed from the high level sludge to reduce the number of high level waste canisters produced. A sodium recycle process would reduce the volume of low-activity waste glass produced and minimize the need to purchase new sodium hydroxide, so there is a renewed interest in investigating sodium recycle. This document describes an electrochemical facility for recycling sodium for the WTP.
Date:
April 12, 2008
Creator:
Sevigny, Gary J.; Poloski, Adam P.; Fountain, Matthew S. & Kurath, Dean E.
Object Type:
Report
System:
The UNT Digital Library
Energetic Particle-induced Geodesic Acoustic Mode
A new energetic particle-induced Geodesic Acoustic Mode (EGAM) is shown to exist. The mode frequency, mode structure, and mode destabilization are determined non-perturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam- driven n=0 mode in DIII-D. The new mode is important since it can degrade energetic particle confinement as shown in the DIII-D experiments. The new mode may also affect the thermal plasma confinement via its interaction with plasma micro-turbulence.
Date:
September 12, 2008
Creator:
Fu, G. Y.
Object Type:
Report
System:
The UNT Digital Library
Index Theorem for Topological Excitations on R^3 \times S^1 and Chern-Simons Theory
We derive an index theorem for the Dirac operator in the background of various topological excitations on an R{sup 3} x S{sup 1} geometry. The index theorem provides more refined data than the APS index for an instanton on R{sup 4} and reproduces it in decompactification limit. In the R{sup 3} limit, it reduces to the Callias index theorem. The index is expressed in terms of topological charge and the {eta}-invariant associated with the boundary Dirac operator. Neither topological charge nor {eta}-invariant is typically an integer, however, the non-integer parts cancel to give an integer-valued index. Our derivation is based on axial current non-conservation--an exact operator identity valid on any four-manifold--and on the existence of a center symmetric, or approximately center symmetric, boundary holonomy (Wilson line). We expect the index theorem to usefully apply to many physical systems of interest, such as low temperature (large S{sup 1}, confined) phases of gauge theories, center stabilized Yang-Mills theories with vector-like or chiral matter (at S{sup 1} of any size), and supersymmetric gauge theories with supersymmetry-preserving boundary conditions (also at any S{sup 1}). In QCD-like and chiral gauge theories, the index theorem should shed light into the nature of topological excitations responsible for …
Date:
December 12, 2008
Creator:
Poppitz, Erich & Unsal, Mithat
Object Type:
Article
System:
The UNT Digital Library
The ecology and genomics of C02 fixation in oceanic river plumes
The ocean/atmosphere interface is the major conduit for the entry of atmospheric CO2 into oceanic carbon pools that can lead to sequestration or recycled release. The surface layers of the temperate and tropical oceans are often too oligotrophic to result in significant primary production that might lead to carbon sequestration. However, nutrient-rich river plumes can alter the primary production schemes of oligotrophic ocean basins, resulting in increased phytoplankton biomass and carbon fixation. The ultimate goal of this proposal is to understand these carbon cycling processes in major river plumes from the molecular processes involved in biological DIC uptake to contribution to basin-wide production and potential sequestration. Our research efforts include a field component to answer the questions raised concerning DIC in plumes entering ocean basins and an intensive genomics approach to understanding these processes on the cellular level using genomic fragments obtained from plume biota. This project is actually composed of 3 separate PI-initiated projects, including projects at the University of South Florida (USF) College of Marine Science, the University of Puerto Rico, and The Ohio State University. This report concerns research conducted at The Ohio State University and studies performed in collaboration with USF. In order to understand what …
Date:
September 12, 2008
Creator:
Tabita, F. Robert
Object Type:
Report
System:
The UNT Digital Library
Toward Production From Gas Hydrates: Current Status, Assessment of Resources, and Simulation-Based Evaluationof Technology and Potential
Gas hydrates are a vast energy resource with global distribution in the permafrost and in the oceans. Even if conservative estimates are considered and only a small fraction is recoverable, the sheer size of the resource is so large that it demands evaluation as a potential energy source. In this review paper, we discuss the distribution of natural gas hydrate accumulations, the status of the primary international R&D programs, and the remaining science and technological challenges facing commercialization of production. After a brief examination of gas hydrate accumulations that are well characterized and appear to be models for future development and gas production, we analyze the role of numerical simulation in the assessment of the hydrate production potential, identify the data needs for reliable predictions, evaluate the status of knowledge with regard to these needs, discuss knowledge gaps and their impact, and reach the conclusion that the numerical simulation capabilities are quite advanced and that the related gaps are either not significant or are being addressed. We review the current body of literature relevant to potential productivity from different types of gas hydrate deposits, and determine that there are consistent indications of a large production potential at high rates over …
Date:
February 12, 2008
Creator:
Reagan, Matthew; Moridis, George J.; Collett, Timothy; Boswell, Ray; Kurihara, M.; Reagan, Matthew T. et al.
Object Type:
Article
System:
The UNT Digital Library
Performance of a 1.3 GHZ Normal-Conducting 5-Cell Standing-Wave Cavity
A 5-cell, normal-conducting, 1.3 GHz, standing-wave (SW) cavity was built as a prototype capture accelerator for the ILC positron source. Although the ILC uses predominantly superconducting cavities, the capture cavity location in both a high radiation environment and a solenoidal magnetic field requires it to be normal conducting. With the relatively high duty ILC beam pulses (1 msec at 5 Hz) and the high gradient required for efficient positron capture (15 MV/m), achieving adequate cavity cooling to prevent significant detuning is challenging. This paper presents the operational performance of this cavity including the processing history, characteristics of the breakdown events and the acceleration gradient witnessed by a single bunch at different injection times for different rf pulse lengths.
Date:
November 12, 2008
Creator:
Wang, Faya; Adolphsen, Chris & Wang, Juwen
Object Type:
Article
System:
The UNT Digital Library
Ferromagnetism and suppression of metallic clusters in Fe implanted ZnO -- a phenomenon related to defects?
We investigated ZnO(0001) single crystals annealed in high vacuum with respect to their magnetic properties and cluster formation tendency after implant-doping with Fe. While metallic Fe cluster formation is suppressed, no evidence for the relevance of the Fe magnetic moment to the observed ferromagnetism was found. The latter along with the cluster suppression is discussed with respect to defects in the ZnO host matrix, since the crystalline quality of the substrates was lowered due to the preparation as observed by x-ray diffraction.
Date:
March 12, 2008
Creator:
Arenholz, Elke; Zhou, S.; Potzger, K.; Talut, G.; Reuther, H.; Kuepper, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Application of Proteomics and Lipid Studies in Environmental Biotechnology
The overview of changes in protein levels or states in response to a growth condition, stress, mutation or metabolic engineering is invaluable in understanding the physiology of a microbial system. The lipid profile of the cell is similarly a valuable diagnostic of the cellular response and health, especially in context of survival in a fluctuating environment. To obtain comprehensive cellular models, post-transcriptional cell wide surveys at the levels of proteins and lipids are required. Both these fields have been greatly bolstered by the development of high throughput methods using mass spectrometry. Multiple strategies now exist for the identification of proteins, and numerous workflows to quantify protein abundance have also been developed. Cellular profiling such as these allows us to assess the potential of a microbial system for environmental applications such as bioremediation and bio-energy.
Date:
August 12, 2008
Creator:
Mukhopadhyay, Aindrila
Object Type:
Presentation
System:
The UNT Digital Library
"Nanotechnology Enabled Advanced Industrial Heat Transfer Fluids"
ABSTRACT Nanotechnology Enabled Advanced industrial Heat Transfer Fluids” Improving the efficiency of Industrial Heat Exchangers offers a great opportunity to improve overall process efficiencies in diverse industries such as pharmaceutical, materials manufacturing and food processing. The higher efficiencies can come in part from improved heat transfer during both cooling and heating of the material being processed. Additionally, there is great interest in enhancing the performance and reducing the weight of heat exchangers used in automotives in order to increase fuel efficiency. The goal of the Phase I program was to develop nanoparticle containing heat transfer fluids (e.g., antifreeze, water, silicone and hydrocarbon-based oils) that are used in transportation and in the chemical industry for heating, cooling and recovering waste heat. Much work has been done to date at investigating the potential use of nanoparticle-enhanced thermal fluids to improve heat transfer in heat exchangers. In most cases the effect in a commercial heat transfer fluid has been marginal at best. In the Phase I work, we demonstrated that the thermal conductivity, and hence heat transfer, of a fluid containing nanoparticles can be dramatically increased when subjected to an external influence. The increase in thermal conductivity was significantly larger than what is …
Date:
June 12, 2008
Creator:
Skandan, Dr. Ganesh; Singhal, Dr. Amit; Eberts, Mr. Kenneth; Sobrevilla, Mr. Damian; Shan, Prof. Jerry; Tse, Stephen et al.
Object Type:
Report
System:
The UNT Digital Library
Surprising Coordination Geometry Differences in Ce(IV)- and Pu(IV)-Maltol Complexes
As part of a study to characterize the detailed coordination behavior of Pu(IV), single crystal X-ray diffraction structures have been determined for Pu(IV) and Ce(IV) complexes with the naturally-occurring ligand maltol (3-hydroxy-2-methyl-pyran-4-one) and its derivative bromomaltol (5-bromo-3-hydroxy-2-methyl-pyran-4-one). Although Ce(IV) is generally accepted as a structural analog for Pu(IV), and the maltol complexes of these two metals are isostructural, the corresponding bromomaltol complexes are strikingly different with respect to ligand orientation about the metal ion: All complexes exhibit trigonal dodecahedral coordination geometry but the Ce(IV)-bromomaltol complex displays an uncommon ligand arrangement not mirrored in the Pu(IV) complex, although the two metal species are generally accepted to be structural analogs.
Date:
February 12, 2008
Creator:
Laboratory, Lawrence Berkeley National; Raymond, Kenneth; Szigethy, Geza; Xu, Jide; Gorden, Anne E.V.; Teat, Simon J. et al.
Object Type:
Article
System:
The UNT Digital Library