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open access

Broadband Internet Access: Background and Issues

Description: From a public policy perspective, the goals are to ensure that broadband deployment is timely, that industry competes fairly, and that service is provided to all sectors and geographical locations of American society. The federal government -- through Congress and the Federal Communications Commission (FCC) -- is seeking to ensure fair competition among the players so that broadband will be available and affordable in a timely manner to all Americans who want it. While the FCC's position is not… more
Date: January 21, 2004
Creator: Gilroy, Angele A. & Kruger, Lennard G.
Partner: UNT Libraries Government Documents Department
open access

Calculating Sensitivities, Response and Uncertainties Within LODI for Precipitation Scavenging

Description: This paper describes an investigation into the uses of first-order, local sensitivity analysis in a Lagrangian dispersion code. The goal of the project is to gain knowledge not only about the sensitivity of the dispersion code predictions to the specific input parameters of interest, but also to better understand the uses and limitations of sensitivity analysis within such a context. The dispersion code of interest here is LODI, which is used for modeling emergency release scenarios at the Depa… more
Date: January 21, 2004
Creator: Loosmore, G; Hsieh, H & Grant, K
Partner: UNT Libraries Government Documents Department
open access

Elections Reform: Overview and Issues

Description: This report discusses several issues as the Congress considers legislation to reform the voting process, a number of issues have emerged as part of the debate: the reliability of different types of voting technologies; voting problems and irregularities in the 2000 election; problems for militaryand overseas voters; the electoral college; and early media projections of election results. Both sessions of the 107th Congress considered and debated federal election reform legislation, and the Help … more
Date: January 21, 2004
Creator: Coleman, Kevin J. & Fischer, Eric A.
Partner: UNT Libraries Government Documents Department
open access

Electroweak and higgs physics at D0

Description: We present recent results from the D0 experiment on W and Z boson production using {approx} 50 pb{sup -1} of Run II data recorded at the center of mass energy of 1.96 TeV at the Fermilab Tevatron. Initial studies of W/Z + 2 jets production that are relevant to Higgs searches are also discussed.
Date: January 21, 2004
Creator: Varelas, Nikos
Partner: UNT Libraries Government Documents Department

Faculty Recital: 2004-01-21 - UNT Woodwind Chamber Music

Description: Recital performed at UNT College of Music Recital Hall.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: January 21, 2004
Duration: 1 hour 6 minutes 51 seconds
Creator: Sundberg, Terri; Vewazey, Charles; Scott, John C. (John Charles), 1947-; Gillespie, James; Reynolds, Kathleen; Scharnberg, William et al.
Partner: UNT Music Library
open access

Feature Subset Selection, Class Separability, and Genetic Algorithms

Description: The performance of classification algorithms in machine learning is affected by the features used to describe the labeled examples presented to the inducers. Therefore, the problem of feature subset selection has received considerable attention. Genetic approaches to this problem usually follow the wrapper approach: treat the inducer as a black box that is used to evaluate candidate feature subsets. The evaluations might take a considerable time and the traditional approach might be unpractical… more
Date: January 21, 2004
Creator: Cantu-Paz, E
Partner: UNT Libraries Government Documents Department
open access

Final Report on ASU Research Funded through Lawrence Livermore National Laboratory Grant ASU XAJ9991/CO

Description: The line of inquiry which the ASU lidar group has been investigating, with collaboration and support from LLNL, is to create approaches and algorithms for better utilizing the rich information available through modern remote sensors in dispersion modeling systems. In particular, our goal is to create a lidar-data-driven dispersion model mode in ADAPT/LODI. This report describes progress towards this goal during the 2002/2003 academic year. Because of the nature of lidar data and the necessity t… more
Date: January 21, 2004
Creator: Calhoun, R & Sommer, J
Partner: UNT Libraries Government Documents Department
open access

An Integrated Universal Collapsar Gamma-ray Burst Model

Description: Starting with two assumptions: (1) gamma-ray bursts originate from stellar death phenomena or so called ''collapsars'' and (2) that these bursts are quasi-universal, whereby the majority of the observed variation is due to our perspective of the jet, an integrated gamma-ray burst model is proposed. It is found that several of the key correlations in the data can be naturally explained with this simple picture and another possible correlation is predicted.
Date: January 21, 2004
Creator: Salmonson, J D
Partner: UNT Libraries Government Documents Department
open access

Nuclear Weapons in Russia: Safety, Security, and Control Issues

Description: This report provides background information on the location of nuclear weapons at the time of the demise of the Soviet Union and their subsequent relocation to storage and deployment areas in Russia. It also provides a description of the safety, security, and control issues raised in 1991 and in more recent years. It includes a brief listing of the cooperative programs and assistance the United States has provided to Russia and the other former Soviet states in an effort to address concerns abo… more
Date: January 21, 2004
Creator: Woolf, Amy F.
Partner: UNT Libraries Government Documents Department
open access

Open Midplane Dipole Design for Lhc Ir Upgrade.

Description: The proposed luminosity upgrade of the Large Hadron Collider (LHC), now under construction, will bring a large increase in the number of secondary particles from p-p collisions at the interaction point (IP). Energy deposition will be so large that the lifetime and quench performance of interaction region (IR) magnets may be significantly reduced if conventional designs are used. Moreover, the cryogenic capacity of the LHC will have to be significantly increased as the energy deposition load on … more
Date: January 21, 2004
Creator: Gupta, R.; Anerella, M.; Harrison, M.; Schmalzle, J. & Mokhov, N.
Partner: UNT Libraries Government Documents Department
open access

Panel discussion: Models and methods: Can theory meet the B physics challenge?

Description: The b physics experiments of the next generation, BTeV and LHCb, will perform measurements with an unprecedented accuracy. Theory predictions must control hadronic uncertainties with the same precision to extract the desired short-distance information successfully. I argue that this is indeed possible, discuss those theoretical methods in which hadronic uncertainties are under control and list hadronically clean observables.
Date: January 21, 2004
Creator: Nierste, Ulrich
Partner: UNT Libraries Government Documents Department
open access

Permanent Magnet Designs With Large Variations in Field Strength.

Description: The use of permanent magnets has been investigated as an option for electron cooling ring for the proposed luminosity upgrade of RHIC. Several methods have been developed that allow a large variation in field strength. These design concepts were verified with computer simulations using finite element codes. It will be shown that the field uniformity is maintained while the field strength is mechanically adjusted.
Date: January 21, 2004
Creator: Gupta, R.
Partner: UNT Libraries Government Documents Department
open access

Phase I Report: DARPA Exoskeleton Program

Description: The Defense Advanced Research Projects Agency (DARPA) inaugurated a program addressing research and development for an Exoskeleton for Human Performance Augmentation in FY!2001. A team consisting of Oak Ridge National Laboratory, the prime contractor, AeroVironment, Inc., the Army Research Laboratory, the University of Minnesota, and the Virginia Polytechnic Institute has recently completed an 18-month Phase I effort in support of this DARPA program. The Phase I effort focused on the developmen… more
Date: January 21, 2004
Creator: Jansen, J.F.
Partner: UNT Libraries Government Documents Department
open access

Physics and Advanced Technologies LDRD Final Report:Adaptive Optics Imaging and Spectroscopy of the Solar System

Description: This focus of this project was the investigation of the planets Uranus and Neptune and Saturn's moon Titan using adaptive optics imaging and spectroscopy at the 10-meter W.M. Keck Telescopes. These bodies share a common type of atmosphere, one that is rich in methane and has a hydrocarbon haze layer produced by methane photolysis. Neptune and Uranus have atmospheric features which change on short timescales; we have investigated their altitude, composition, and connection to events occurring de… more
Date: January 21, 2004
Creator: Gibbard, S; Max, C; Macintosh, B & Grossman, A
Partner: UNT Libraries Government Documents Department
open access

Raman spectroscopy and time-resolved photoluminescence of BN and BxCyNz nanotubes

Description: We report Raman and time-resolved photoluminescence spectroscopic studies of multiwalled BN and B{sub x}C{sub y}N{sub z} nanotubes. The Raman spectroscopy shows that the as-grown B{sub x}C{sub y}N{sub z} charge recombination, respectively. Comparison of the photoluminescence of BN nanotubes to that decay process is characterized by two time constants that are attributed to intra- and inter-BN sheet nanotubes as predicted by theory. nanotubes are radially phase separated into BN shells and carbo… more
Date: January 21, 2004
Creator: Wu, J.; Han, Wei-Qiang; Walukiewicz, W.; Ager, J. W., III; Shan, W.; Haller, E. E. et al.
Partner: UNT Libraries Government Documents Department
open access

Strong gravitational lensing and dark energy complementarity

Description: In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w{sub 0} and time variation w{sub a}. Quantities that have instead positive correlation and so a sensitivity direction largely orthogonal to, e.g., distance probes offer the hope of achieving tight constraints through comple… more
Date: January 21, 2004
Creator: Linder, Eric V.
Partner: UNT Libraries Government Documents Department
open access

Tomographic reconstructions using map algorithms - application to the SPIDR mission

Description: The spectral image of an astronomical scene is reconstructed from noisy tomographic projections using maximum a posteriori (MAP) and filtered backprojection (FBP) algorithms. Both maximum entropy (ME) and Gibbs prior are used in the MAP reconstructions. The scene, which is a uniform background with a localized emissive source superimposed on it, is reconstructed for a broad range of source counts. The algorithms are compared regarding their ability to detect the source in the background. Detect… more
Date: January 21, 2004
Creator: Ghosh Roy, D.N.; Wilton, K.; Cook, T.A.; Chakrabarti, S.; Qi, J. & Gullberg, G.T.
Partner: UNT Libraries Government Documents Department
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