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462 Matching Results
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The Federal Protective Service and Contract Security Guards: A Statutory History and Current Status
None
Date:
February 11, 2008
Creator:
Reese, Shawn
Object Type:
Report
System:
The UNT Digital Library
Bond Insurers: Issues for the 110th Congress
This report begins with a description of the bond insurance industry and its business model, including the relatively recent move into providing insurance for asset-backed securities.An Analysis of the current market difficulties follows along with the various possibilities of spillover effects.Finally, a number of broader policy questions are briefly discussed.
Date:
February 11, 2008
Creator:
Webel, Baird & Getter, Darryl E.
Object Type:
Report
System:
The UNT Digital Library
Final Report LDRD 02-ERD-013 Dense Plasma Characterization by X-ray Thomson Scattering
We have successfully demonstrated spectrally-resolved x-ray scattering in a variety of dense plasmas as a powerful new technique for providing microscopic dense plasma parameters unattainable by other means. The results have also been used to distinguish between ionization balance models. This has led to 10 published or to be published papers, 8 invited talks and significant interest from both internal and external experimental plasma physicists and the international statistical plasma physics theory community.
Date:
February 11, 2005
Creator:
Landen, O L; Glenzer, S H; Gregori, G; Pollaine, S M; Hammer, J H; Rogers, F et al.
Object Type:
Report
System:
The UNT Digital Library
Speckle Imaging of Titan at 2 microns: Surface Albedo, Haze Optical Depth, and Tropospheric Clouds 1996-1998
We present results from 14 nights of observations of Titan in 1996-1998 using near-infrared (centered at 2.1 microns) speckle imaging at the 10-meter W.M. Keck Telescope. The observations have a spatial resolution of 0.06 arcseconds. We detect bright clouds on three days in October 1998, with a brightness about 0.5% of the brightness of Titan. Using a 16-stream radiative transfer model (DISORT) to model the central equatorial longitude of each image, we construct a suite of surface albedo models parameterized by the optical depth of Titan's hydrocarbon haze layer. From this we conclude that Titan's equatorial surface albedo has plausible values in the range of 0-0.20. Titan's minimum haze optical depth cannot be constrained from this modeling, but an upper limit of 0.3 at this wavelength range is found. More accurate determination of Titan's surface albedo and haze optical depth, especially at higher latitudes, will require a model that fully considers the 3-dimensional nature of Titan's atmosphere.
Date:
February 11, 2004
Creator:
Gibbard, S. G.; Gavel, D.; Ghez, A. M.; de Pater, I.; Max, C. E.; Young, E. F. et al.
Object Type:
Article
System:
The UNT Digital Library
Kinetics of Solid Phase Reactions at High Pressure and Temperature
We report on the subject of temperature and/or pressure induced solid-solid phase transitions of energetic molecular crystals. Over the last three years we have applied experimental techniques that when used simultaneously provide insight into some of the complexities that govern reaction rate processes. After more than 55 years of study a global kinetics model describing the P-T phase space transition kinetics of such materials as HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) is not only missing, but from a formal perspective is perhaps as many years away from completion. The essence of this report describes what material parameters affect first-order reaction rates of the CHNO moiety of molecular crystals and introduces the application of new experimental tools thus permitting quantifiable studies of important rate limiting mechanisms.
Date:
February 11, 2002
Creator:
Zaug, J M; Farber, D L; Saw, C K & Weeks, B L
Object Type:
Report
System:
The UNT Digital Library
Visa Issuances: Policy, Issues, and Legislation
This report opens with an overview of visa issuances, with sections on procedures for aliens coming to live in the United States permanently and on procedures for aliens admitted for temporary stays. It includes a discussion of visa screening policies, including inadmissibility, databases, an analysis of visa refusals, biometric visas and other major visa policy procedures. Summaries of key laws revising visa policy enacted in the 107th Congress follows. The final section analyzes selected issues in the 108th Congress, notably visa revocation and removal, new technologies, potential impact on business, and other security concerns.
Date:
February 11, 2004
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
Final Report 02-ERD-033: Rapid Resolidification of Metals using Dynamic Compression
The purpose of this project is to develop a greater understanding of the kinetics involved during a liquid-solid phase transition occurring at high pressure and temperature. Kinetic limitations are known to play a large role in the dynamics of solidification at low temperatures, determining, e.g., whether a material crystallizes upon freezing or becomes an amorphous solid. The role of kinetics is not at all understood in transitions at high temperature when extreme pressures are involved. In order to investigate time scales during a dynamic compression experiment we needed to create an ability to alter the length of time spent by the sample in the transition region. Traditionally, the extreme high-pressure phase diagram is studied through a few static and dynamic techniques: static compression involving diamond anvil cells (DAC) [1], shock compression [2, 3], and quasi-isentropic compression [4, 5, 6, 7, 8, 9, 10]. Static DAC experiments explore equilibrium material properties along an isotherm or an isobar [1]. Dynamic material properties can be explored with shock compression [2, 3], probing single states on the Hugoniot, or with quasi-isentropic compression [4, 5, 6, 7, 8, 9, 10]. In the case of shocks, pressures variation typically occurs on a sub-nanosecond time scale or …
Date:
February 11, 2005
Creator:
Streitz, F. H.; Nguyen, J. H.; Orlikowski, D.; Minich, R.; Moriarty, J. A. & Holmes, N. C.
Object Type:
Report
System:
The UNT Digital Library
Industrial Competitiveness and Technological Advancement: Debate Over Government Policy
This document includes discussion of the debate over government policy regarding industrial competitiveness and technological advancement. Technology and competitiveness, federal roles, and various approaches are among topics mentioned in this report.
Date:
February 11, 2005
Creator:
Schacht, Wendy H.
Object Type:
Report
System:
The UNT Digital Library
Expedited Citizenship Through Military Service: Current Law, Policy and Issues
None
Date:
February 11, 2008
Creator:
Lee, Margaret Mikyung & Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
Final Report 200 MW L-Band Annular Beam Klystron for Accelerators
This program developed a 200 MW, 1.3 GHz, Annular Beam Klystron (ABK) for accelerator systems. An ABK provides lower impedance than a conventional klystron, making it possible to produce higher RF powers with lower voltages. With a higher power per unit, fewer klystrons would be required for a large accelerator. Lower voltage also simplifies and reduces the cost of the power supply system. Both features will significantly lower the cost of an RF system. This device operates at 475 kV. The klystron uses a magnetron injection gun producing 1100 A in one microsecond pulses. Power is extracted into fundamental rectangular waveguide through two output windows. The predicted gain is approximately 45 dB with estimated efficiency of 45%. The klystron was assembled, but no facility was available for testing. Consequently, no high power performance measurements are available. Because the assembled klystron is approximately 15 feet long, it was disassembled for storage. It can be reassembled should a use materialize.
Date:
February 11, 2009
Creator:
Read, Michael; Ferguson, Patrick; Ives, Lawrence; Song, Liqun; Carlsten, Bruce & Fazio, Michael
Object Type:
Report
System:
The UNT Digital Library
Short Pulse Laser Applications Design
We are applying our recently developed, LDRD-funded computational simulation tool to optimize and develop applications of Fast Ignition (FI) for stockpile stewardship. This report summarizes the work performed during a one-year exploratory research LDRD to develop FI point designs for the National Ignition Facility (NIF). These results were sufficiently encouraging to propose successfully a strategic initiative LDRD to design and perform the definitive FI experiment on the NIF. Ignition experiments on the National Ignition Facility (NIF) will begin in 2010 using the central hot spot (CHS) approach, which relies on the simultaneous compression and ignition of a spherical fuel capsule. Unlike this approach, the fast ignition (FI) method separates fuel compression from the ignition phase. In the compression phase, a laser such as NIF is used to implode a shell either directly, or by x rays generated from the hohlraum wall, to form a compact dense ({approx}300 g/cm{sup 3}) fuel mass with an areal density of {approx}3.0 g/cm{sup 2}. To ignite such a fuel assembly requires depositing {approx}20kJ into a {approx}35 {micro}m spot delivered in a short time compared to the fuel disassembly time ({approx}20ps). This energy is delivered during the ignition phase by relativistic electrons generated by the interaction …
Date:
February 11, 2008
Creator:
Town, R J; Clark, D S; Kemp, A J; Lasinski, B F & Tabak, M
Object Type:
Report
System:
The UNT Digital Library
Unemployment Benefits: Legislative Issues in the 108th Congress
This report discusses the federal-state unemployment compensation (UC) system, which pays benefits to covered workers who become involuntarily unemployed for economic reasons and meet state-established eligibility rules.
Date:
February 11, 2004
Creator:
Franco, Celinda
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Ed. 1 Friday, February 11, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 11, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 17, Ed. 1 Wednesday, February 11, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Paleontological overview of oil shale and tar sands areas in Colorado, Utah, and Wyoming.
In August 2005, the U.S. Congress enacted the Energy Policy Act of 2005, Public Law 109-58. In Section 369 of this Act, also known as the ''Oil Shale, Tar Sands, and Other Strategic Unconventional Fuels Act of 2005,'' Congress declared that oil shale and tar sands (and other unconventional fuels) are strategically important domestic energy resources that should be developed to reduce the nation's growing dependence on oil from politically and economically unstable foreign sources. In addition, Congress declared that both research- and commercial-scale development of oil shale and tar sands should (1) be conducted in an environmentally sound manner using management practices that will minimize potential impacts, (2) occur with an emphasis on sustainability, and (3) benefit the United States while taking into account concerns of the affected states and communities. To support this declaration of policy, Congress directed the Secretary of the Interior to undertake a series of steps, several of which are directly related to the development of a commercial leasing program for oil shale and tar sands. One of these steps was the completion of a programmatic environmental impact statement (PEIS) to analyze the impacts of a commercial leasing program for oil shale and tar sands …
Date:
February 11, 2009
Creator:
Murphey, P. C.; Daitch, D. & Division, Environmental Science
Object Type:
Report
System:
The UNT Digital Library
Lessons Learned in Risk Management on NCSX
The National Compact Stellarator Experiment (NCSX) was designed to test physics principles of an innovative stellarator design developed by the Princeton Plasma Physics Laboratory and Oak Ridge National Laboratory. Construction of some of the major components and sub-assemblies was completed, but the estimated cost and schedule for completing the project grew as the technical requirements and risks became better understood, leading to its cancellation in 2008. The project's risks stemmed from its technical challenges, primarily the complex component geometries and tight tolerances that were required. The initial baseline, established in 2004, was supported by a risk management plan and risk-based contingencies, both of which proved to be inadequate. Technical successes were achieved in the construction of challenging components and subassemblies, but cost and schedule growth was experienced. As part of an effort to improve project performance, a new risk management program was devised and implemented in 2007-08. It led to a better understanding of project risks, a sounder basis for contingency estimates, and improved management tools. Although the risks ultimately were unacceptable to the sponsor, valuable lessons in risk management were learned through the experiences with the NCSX project.
Date:
February 11, 2009
Creator:
G.H. Neilson, C.O. Gruber, J.H. Harris, D.J. Rej, R.T. Simmons, and R.L. Strykowsky
Object Type:
Article
System:
The UNT Digital Library
A Markov Model for Assessing the Reliability of a Digital Feedwater Control System
A Markov approach has been selected to represent and quantify the reliability model of a digital feedwater control system (DFWCS). The system state, i.e., whether a system fails or not, is determined by the status of the components that can be characterized by component failure modes. Starting from the system state that has no component failure, possible transitions out of it are all failure modes of all components in the system. Each additional component failure mode will formulate a different system state that may or may not be a system failure state. The Markov transition diagram is developed by strictly following the sequences of component failures (i.e., failure sequences) because the different orders of the same set of failures may affect the system in completely different ways. The formulation and quantification of the Markov model, together with the proposed FMEA (Failure Modes and Effects Analysis) approach, and the development of the supporting automated FMEA tool are considered the three major elements of a generic conceptual framework under which the reliability of digital systems can be assessed.
Date:
February 11, 2009
Creator:
Chu, T. L.; Yue, M.; Martinez-Guridi, G. & Lehner, J.
Object Type:
Article
System:
The UNT Digital Library
Highly Fluorescent Group 13 Metal Complexes with Cyclic, Aromatic Hydroxamic Acid Ligands
The neutral complexes of two ligands based on the 1-oxo-2-hydroxy-isoquinoline (1,2-HOIQO) motif with group 13 metals (Al, Ga, In) show bright blue-violet luminescence in organic solvents. The corresponding transition can be attributed to ligand-centered singlet emission, characterized by a small Stokes shifts of only a few nm combined with lifetimes in the range between 1-3 ns. The fluorescence efficiency is high, with quantum yields of up to 37% in benzene solution. The crystal structure of one of the indium(III) complexes (trigonal space group R-3, a = b = 13.0384(15) {angstrom}, c = 32.870(8) {angstrom}, ? = {beta} = 90{sup o}, {gamma} = 120{sup o}, V = 4839.3(14) {angstrom}{sup 3}, Z = 6) shows a six-coordinate geometry around the indium center which is close to trigonal-prismatic, with a twist angle between the two trigonal faces of 20.7{sup o}. Time-dependent density functional theory (TD-DFT) calculations (Al and Ga: B3LYP/6-31G(d)); In: B3LYP/LANL2DZ of the fac and mer isomers with one of the two ligands indicate that there is no clear preference for either one of the isomeric forms of the metal complexes. In addition, the metal centers do not have a significant influence on the electronic structure, and as a consequence, on the …
Date:
February 11, 2008
Creator:
Seitz, Michael; Moore, Evan G. & Raymond, Kenneth N.
Object Type:
Article
System:
The UNT Digital Library
Notification of Concurrence - K-25/K-27 D&D Project, ETTP - Change Number of EMWMF Waste Lots in the Waste Handling Plan for Demolition of the K-25 and K-27 Building Structures and Remaining Components Located at the ETTP, Oak Ridge, TN From Two to Three
Section 5.1 of the approved Waste Handling Plan for Demolition ofthe K-25 and K-2 7 Building Structures and Remaining Components Located at the East Tennessee Technology Park, Oak Ridge, Tennessee (WHP) includes two Environmental Management Waste Management (EMWMF) waste lots: (1) Asbestos-contaminated roofing/transite; and (2) Construction debris, such as nonasbestos roofing, structural steel/miscellaneous metal/equipment, nonradiological piping, wood, and miscellaneous small quantities of concrete. This concurrence form adds an additional EMWMF waste lot 6.47 for lavatory sink drains. Based on an analysis of the building structure characterization data, the only individual building structure with either an analytic carcinogenic or Hazard Index (HI) sum-of-fractions (SOF) greater than 1 is the lavatory sink drains (Table 1). The HI SOF for the lavatory sink drains is 1.34 (Table 2). When all media are combined with the material of construction calculations, the HI SOF is 1.22 (Table 3). However, when the lavatory sink drains are segregated from all other media, the HI SOF is only 0.256, which is well below the EMWMF waste acceptance criteria SOF limit of 1 (Table 4). Given the large volume (124, 625 cubic yards) of other building structure media with a small HI SOF of 0.256 and the small volume …
Date:
February 11, 2009
Creator:
K.D., Trice
Object Type:
Report
System:
The UNT Digital Library
Space-charge effects in ultra-high current electron bunches generated by laser-plasma accelerators
Recent advances in laser-plasma accelerators, including the generation of GeV-scale electron bunches, enable applications such as driving a compact free-electron-laser (FEL). Significant reduction in size of the FEL is facilitated by the expected ultra-high peak beam currents (10-100 kA) generated in laser-plasma accelerators. At low electron energies such peak currents are expected to cause space-charge effects such as bunch expansion and induced energy variations along the bunch, potentially hindering the FEL process. In this paper we discuss a self-consistent approach to modeling space-charge effects for the regime of laser-plasma-accelerated ultra-compact electron bunches at low or moderate energies. Analytical treatments are considered as well as point-to-point particle simulations, including the beam transport from the laser-plasma accelerator through focusing devices and the undulator. In contradiction to non-self-consistent analyses (i.e., neglecting bunch evolution), which predict a linearly growing energy chirp, we have found the energy chirp reaches a maximum and decreases thereafter. The impact of the space-charge induced chirp on FEL performance is discussed and possible solutions are presented.
Date:
February 11, 2009
Creator:
Grinner, F. J.; Schroeder, C. B.; Maier, A. R.; Becker, S. & Mikhailova, J. M.
Object Type:
Article
System:
The UNT Digital Library
Self-reported Impacts of LED Lighting Technology Compared to Fuel-based Lighting on Night Market Business Prosperity in Kenya
The notion of"productive use" is often invoked in discussions about whether new technologies improve productivity or otherwise enhance commerce in developing-country contexts. It an elusive concept,especially when quantitative measures are sought. Improved and more energy efficient illumination systems for off-gridapplication--the focus of the Lumina Project--provide a case in which a significant productivity benefit can be imagined, given the importance of light to the successful performance of many tasks, and the very low quality of baseline illumination provided by flame-based source. This Research Note summarizes self-reported quantitative and qualitative impacts of switching to LED lighting technology on the prosperity of night-market business owners and operators. The information was gathered in the context of our 2008 market testing field work in Kenya?s Rift Valley Province, which was performed in the towns of Maai Mahiu and Karagita by Arne Jacobson, Kristen Radecsky, Peter Johnstone, Maina Mumbi, and others. Maai Mahiu is a crossroads town; provision of services to travelers and freight carriers is a primary income source for the residents. In contrast, the primary income for Karagita's residents is from work in the large, factory style flower farms on the eastern shores of Lake Naivasha that specialize in producing cut flowers for export …
Date:
February 11, 2009
Creator:
Johnstone, Peter; Jacobson, Arne; Mills, Evan & Mumbi, Maina
Object Type:
Report
System:
The UNT Digital Library
THE APPLICATION OF AN EVOLUTIONARY ALGORITHM TO THE OPTIMIZATION OF A MESOSCALE METEOROLOGICAL MODEL
We show that a simple evolutionary algorithm can optimize a set of mesoscale atmospheric model parameters with respect to agreement between the mesoscale simulation and a limited set of synthetic observations. This is illustrated using the Regional Atmospheric Modeling System (RAMS). A set of 23 RAMS parameters is optimized by minimizing a cost function based on the root mean square (rms) error between the RAMS simulation and synthetic data (observations derived from a separate RAMS simulation). We find that the optimization can be efficient with relatively modest computer resources, thus operational implementation is possible. The optimization efficiency, however, is found to depend strongly on the procedure used to perturb the 'child' parameters relative to their 'parents' within the evolutionary algorithm. In addition, the meteorological variables included in the rms error and their weighting are found to be an important factor with respect to finding the global optimum.
Date:
February 11, 2008
Creator:
Werth, D. & O'Steen, L.
Object Type:
Article
System:
The UNT Digital Library
Medicare Prescription Drug Proposals: Estimates of Aged Beneficiaries Who Fall Below Income Criteria, by State
This report discusses bills related to Medicare benefits, which include additional assistance for low-income beneficiaries. The assistance would have been in the form of reduced, subsidized or eliminated premiums, deductibles and other cost-sharing. Proposals in the 108th Congress will probably also include some of these features for low-income beneficiaries.
Date:
February 11, 2003
Creator:
Peterson, Chris L. & Morgan, Paulette C.
Object Type:
Report
System:
The UNT Digital Library
Sugar Transport and Metabolism in Thermotoga
The work conducted under this grant demonstrated that the hyperthermophilic bacterium Thermotoga neapolitana carries out glucose and lactose transport in a sodium-dependent manner and that energization of anaerobic cells is required to observe transport. We also demonstrated that Thermotoga maritima carries out maltose and glucose transport using periplasmic sugar binding proteins. We began defining patterns of expression of genes encoding sugar transport and catabolic functions in both T. maritima and T. neapolitana. We began a collaborative effort to identify all the genes regulated at the transcriptional level in response to sugars substrates. These funds also allowed us to begin an examination of the functions of several periplasmic substrate binding proteins encoded in the genome of T. maritima.
Date:
February 11, 2003
Creator:
Noll, Kenneth M. & Romano, Antonio H.
Object Type:
Report
System:
The UNT Digital Library