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Border Business Indicators, Volume 28, Number 4, April 2004
Monthly publication documenting statistics related to economic information in the Mexico-Texas border areas including types of border crossings, employment, customs revenues, and other related data.
Date:
April 2004
Creator:
Texas Center for Border Economic and Enterprise Development
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Firing Ranges: The Airborne Lead Dust Hazard. Shooter's Guide
Booklet outlining information about lead exposure related to handling guns and ammunition, possible effects of lead dust on shooters and their families, and suggestions for increasing safety related to lead.
Date:
April 2004
Creator:
Texas. Department of Health.
Object Type:
Pamphlet
System:
The Portal to Texas History
Target Talk, Number 131, Spring 2004
Newsletter of the Texas Hunter Education Program discussing various events, news, and other information related to the program or of interest to hunters in Texas.
Date:
April 2004
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Risk-Tex, Volume 7, Issue 3, April 2004
Newsletter published by the Texas State Office of Risk Management discussing news, events, and activities of the agency as well as other topics related to risk management for state employees.
Date:
April 2004
Creator:
Texas. State Office of Risk Management.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Parks & Wildlife, Volume 62, Number 4, April 2004
Magazine discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
April 2004
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Round Up, April 2004
Magazine for Texas Lottery retailers that contains news, retailer spotlights, and a list of lottery winners.
Date:
April 2004
Creator:
Texas Lottery Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas EMS Magazine, Volume 25, Number 2, March/April 2004
Bimonthly magazine containing news and information that pertains to Emergency Medical Service (EMS) providers. "The magazine's goals are to help organizations function professionally as EMS providers, to educate individuals so they can perform lifesaving prehospital skills under stressful conditions, and to help the public get into the EMS system when they need it" (p. 4).
Date:
April 2004
Creator:
Texas. Department of State Health Services.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Eye on Nature, Spring 2004
Newsletter of the Texas Wildlife Division discussing news, events, programs, and other topics of interest related to wildlife management in Texas, and Texas Parks and Wildlife activities.
Date:
April 2004
Creator:
Wildlife Diversity Program (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Edwards Aquifer Authority General Manager's Report, April 2004
Monthly newsletter of the general manage at the Edwards Aquifer Authority discussing news and activities of the organization as well as other information related to water in southern Texas.
Date:
April 2004
Creator:
Edwards Aquifer Authority (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
X-Ray Line Measurements with High Efficiency Bragg Crystals
We have studied the focusing properties of two highly oriented pyrolitic graphite (HOPG) spectrometers, which differ in the degree of the mosaic spread: ZYA with a low mosaic spread ({gamma}=0.4 degrees) and ZYH with a large mosaic spread ({gamma}=3.5 degrees). In order to assess the crystal performance for a variety of different experiments, various K{alpha} and K{beta} x-ray lines have been produced using a high-intensity ({approx}>10{sup 17} W/cm{sup 2}) short-pulse ({approx} 100 fs) laser beam focused onto Ti, V, Zn, and Cu foils. The measured spectral resolution of the HOPG crystals in both first and second order diffraction has been compared with theoretical predictions. Using known values for the peak reflectivity of HOPG crystals, we have also computed K{alpha} x-ray conversion efficiencies of Ti, V, Zn, and Cu. These results are important to estimate the optimal conditions under which different types of HOPG monochromators can be used for the detection of weak x-ray signals as the one encountered in x-ray Thomson/Compton scattering experiments.
Date:
April 1, 2004
Creator:
Pak, A; Gregori, G; Knight, J; Campbell, K; Landen, O & Glenzer, S
Object Type:
Article
System:
The UNT Digital Library
Large Eddy Simulation of Turbulent Flow and Dispersion in Urban Areas and Forest Canopies
Under the sponsorship of the U.S. DOE and DHS, we have developed a CFD model for simulating flow and dispersion of chemical and biological agents released in the urban environment. Our model, FEM3MP (Chan and Stevens, 2000), is based on solving the three-dimensional, time-dependent, incompressible Navier-Stokes equations on massively parallel computer platforms. The model uses the finite element method for accurate representation of complex building shapes and variable terrain, together with a semi-implicit projection method and modern iterative solvers for efficient time integration (Gresho and Chan, 1998). Physical processes treated include turbulence modeling via the RANS (Reynolds Averaged Navier-Stokes) and LES (Large Eddy Simulation) approaches, atmospheric stability, aerosols, UV radiation decay, surface energy budget, and vegetative canopies, etc. Predictions from our model are continuously being verified and validated against data from wind tunnel (Chan and Stevens, 2000; Chan, et al., 2001) and field experiments (Chan, et al., 2002, 2003; Lee, et al., 2002; Humphreys, et al., 2003; and Calhoun, et al., 2004). Discussed below are several examples to illustrate the use of FEM3MP in simulating flow and dispersion in urban areas and forest canopies, with model results compared against available field measurements.
Date:
April 9, 2004
Creator:
Chan, Stevens T.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the polarization of the K-shell resonance line emission of S13+ and S14+ at relativistic electron beam energies.
We have measured the polarization of the heliumlike sulfur resonance line 1s2p {sup 1}P{sub 1} {yields} 1s{sup 2} {sup 1}S{sub 0}, and of the blend of the lithiumlike sulfur resonance lines 1s2s2p {sup 2}P{sub 3/2} {yields} 1s{sup 2}2s {sup 2}S{sub 1/2} and 1s2s2p {sup 2}P{sub 1/2} {yields} 1s{sup 2}2s {sup 2}S{sub 1/2} as a function of electron beam energy from near threshold to 144 keV. These lines were excited with the LLNL high-energy electron beam ion trap and measured using a newly modified two-crystal technique. Our results test polarization predictions in an energy regime where few empirical results have been reported. We also present calculations of the polarization using two different methods, and good agreement is obtained.
Date:
April 6, 2004
Creator:
Robbins, D; Faenov, A Y; Pikuz, T; Chen, H; Beiersdorfer, P; May, M et al.
Object Type:
Article
System:
The UNT Digital Library
NIF HEPW 2D Radiography Option Survey
None
Date:
April 28, 2004
Creator:
Koch, J
Object Type:
Report
System:
The UNT Digital Library
A Measurement of the Top Quark Mass with the D0 Detector at s**(1/2) = 1.96-TeV using the Matrix Element Method
Using a data set of 158 and 169 pb{sup -1} of D0 Run-II data in the electron and muon plus jets channel, respectively, the top quark mass has been measured using the Matrix Element Method. The method and its implementation are described. Its performance is studied in Monte Carlo using ensemble tests and the method is applied to the Moriond 2004 data set.
Date:
April 1, 2004
Creator:
Kroeninger, Kevin Alexander
Object Type:
Report
System:
The UNT Digital Library
From Minnesota to New Mexico, E85 Expands beyond the Corn Belt; State Energy Program (SEP) Case Studies
DOE's State Energy Program published this case study in conjunction with the New Mexico Division of Energy Conservation and Management. It describes an emerging corridor of service stations selling a specific alternative fuel-E85 ethanol-along highways in New Mexico.
Date:
April 1, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
The Production Cross Sections of the Weak Vector Bosons in Proton Antiproton Collisions at s**(1/2) = 1.96-TeV and a Measurement of the W Boson Decay Width
The theory that describes the fundamental particle interactions is called the Standard Model, which is a gauge field theory that comprises the Glashow-Weinberg-Salam model [1, 2, 3] of the weak and electromagnetic interactions and quantum chromodynamics (QCD) [4, 5, 6], the theory of the strong interactions. The discovery of the W [7, 8] and Z [9, 10] bosons in 1983 by the UA1 and UA2 collaborations at the CERN p{bar p} collider provided a direct confirmation of the unification of the weak and electromagnetic interactions. Since then, many experiments have refined our understanding of the characteristics of the W and Z bosons.
Date:
April 1, 2004
Creator:
Varganov, Alexei Valerievich
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Astro-E2 XRS/EBIT Microcalorimeter XC-ray Spectrometer
The X-ray Spectrometer (XRS) instrument is a revolutionary non-dispersive spectrometer that will form the basis for the Astro-E2 observatory to be launched in 2005. We have recently installed a flight spare XRS microcalorimeter spectrometer at the EBIT-I and SuperEBIT facility at LLNL replacing the XRS from the earlier Astro-E mission and providing twice the resolving power. The XRS microcalorimeter is an x-ray detector that senses the heat deposited by the incident photon. It achieves a high energy resolution by operating at 0.06K and by carefully engineering the heat capacity and thermal conductance. The XRS/EBIT instrument has 32 pixels in a square geometry and achieves an energy resolution of 6 eV at 6 keV, with a bandpass from 0.1 to 12 keV (or more at higher operating temperature). The instrument allows detailed studies of the x-ray line emission of laboratory plasmas. The XRS/EBIT also provides an extensive calibration 'library' for the Astro-E2 observatory.
Date:
April 16, 2004
Creator:
Porter, F S; Brown, G V; Boyce, K R; Kelley, R L; Kilbourne, C A; Beiersdorfer, P et al.
Object Type:
Article
System:
The UNT Digital Library
Implementation of Frictional Contact Conditions in Surface to Surface, Mortar Based Computational Frameworks
A number of recent works have established the mortar technique as an accurate and robust spatial discretization method for contact problems in computational solid mechanics. Since methods based on this idea rely on an integral, non-local representation of the contact operators, their formulation is somewhat more involved than is true for more traditional ''point to surface'' contact algorithms; in particular, the integral projections have nontrivial linearizations in the fully large deformation context. In this work, we concentrate on another aspect of formulations of this type--definition and implementation of frictional contact operators within the mortar contact framework. Issues associated with frame indifference of frictional tractions and kinematics are discussed, and a numerical demonstration of the technique is given.
Date:
April 1, 2004
Creator:
Laursen, T. A.; Yang, B. & Puso, M. A.
Object Type:
Article
System:
The UNT Digital Library
A 3D Frictional Segment-to-Segment Contact Method for Large Deformations and Quadratic Elements
Node-on-segment contact is the most common form of contact used today but has many deficiencies ranging from potential locking to non-smooth behavior with large sliding. Furthermore, node-on-segment approaches are not at all applicable to higher order discretizations (e.g. quadratic elements). In a previous work, [3, 4] we developed a segment-to-segment contact approach for eight node hexahedral elements based on the mortar method that was applicable to large deformation mechanics. The approach proved extremely robust since it eliminated the over-constraint that caused 'locking' and provided smooth force variations in large sliding. Here, we extend this previous approach to treat frictional contact problems. In addition, the method is extended to 3D quadratic tetrahedrals and hexahedrals. The proposed approach is then applied to several challenging frictional contact problems that demonstrate its effectiveness.
Date:
April 1, 2004
Creator:
Puso, M; Laursen, T & Solberg, J
Object Type:
Article
System:
The UNT Digital Library
Studies of laser-driven radiative blast waves
We have performed two sets of experiments looking at laser-driven radiating blast waves. In one set of experiments the effect of a drive laser's passage through a background gas on the hydrodynamical evolution of blast waves was examined. It was found that the laser's passage heats a channel in the gas, creating a region where a portion of the blast wave front had an increased velocity, leading to the formation of a bump-like protrusion on the blast wave. The second set of experiments involved the use of regularly spaced wire arrays to induce perturbations on a blast wave surface. The decay of these perturbations as a function of time was measured for various wave number perturbations and found to be in good agreement with theoretical predictions.
Date:
April 29, 2004
Creator:
Edwards, M J; Hansen, J; Edens, A; Ditmire, T; Adams, R; Rambo, P et al.
Object Type:
Article
System:
The UNT Digital Library
3D Computations and Experiments
This project consists of two activities. Task A, Simulations and Measurements, combines all the material model development and associated numerical work with the materials-oriented experimental activities. The goal of this effort is to provide an improved understanding of dynamic material properties and to provide accurate numerical representations of those properties for use in analysis codes. Task B, ALE3D Development, involves general development activities in the ALE3D code with the focus of improving simulation capabilities for problems of mutual interest to DoD and DOE. Emphasis is on problems involving multi-phase flow, blast loading of structures and system safety/vulnerability studies.
Date:
April 5, 2004
Creator:
Couch, R; Faux, D; Goto, D & Nikkel, D
Object Type:
Report
System:
The UNT Digital Library
Biodiesel is Working Hard in Kentucky
This 4-page Clean Cities fact sheet describes the use of biodiesel fuel in 6 school districts throughout Kentucky. It contains usage information for each school district, as well as contact information for local Clean Cities Coordinators and Biodiesel suppliers.
Date:
April 1, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Biodefense to Cancer Office- Meeting Transcirpt
None
Date:
April 19, 2004
Creator:
Felton, J S; Matthews, D L & Lane, S M
Object Type:
Article
System:
The UNT Digital Library
Heavy Meson Production at a Low-Energy Photon Collider
A low-energy {gamma}{gamma} collider has been discussed in the context of a testbed for a {gamma}{gamma} interaction region at the Next Linear Collider(NLC). We consider the production of heavy mesons at such a testbed using Compton-backscattered photons and demonstrate that their production rivals or exceeds those by BELLE, BABAR or LEP where they are produced indirectly via virtual {gamma}{gamma} luminosities.
Date:
April 15, 2004
Creator:
Asztalos, S
Object Type:
Article
System:
The UNT Digital Library