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The Rambler (Fort Worth, Tex.), Vol. 92, No. 11, Ed. 1 Wednesday, November 10, 2004
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
November 10, 2004
Creator:
Fowler, Whitney
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 91, No. 7, Ed. 1 Wednesday, March 10, 2004
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
March 10, 2004
Creator:
Nettles, Marc
Object Type:
Newspaper
System:
The Portal to Texas History
Armenia, Azerbaijan, and Georgia: Political Developments and Implications for U.S. Interests
None
Date:
November 10, 2004
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY2005: Energy and Water Development
This report is a guide to the Energy and Water Development appropriations bill, including the funding for civil works projects of the Army Corps of Engineers (Corps), the Department of the Interior's Bureau of Reclamation (BOR), most of the Department of Energy (DOE), and a number of independent agencies.
Date:
December 10, 2004
Creator:
Behrens, Carl
Object Type:
Report
System:
The UNT Digital Library
Iraq: Missiles, Unmanned Aerial Vehicles (UAVs) and The Iraq Survey Group Reports
None
Date:
November 10, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Linear Scaling First-Principles Molecular Dynamics with Controlled Accuracy
In our quest for accurate linear scaling first-principles molecular dynamics methods for pseudopotential DFT calculations, we investigate the accuracy of real-space grid approaches, with finite differences and spherical localization regions. We examine how the positions of the localization centers affect the accuracy and the convergence rate of the optimization process. In particular we investigate the accuracy of the atomic forces computation compared to the standard O(N{sup 3}) approach. We show the exponential decay of the error on the energy and forces with the size of the localization regions for a variety of realistic physical systems. We propose a new algorithm to automatically adapt the localization centers during the ground state computation which allows for molecular dynamics simulations with diffusion processes. The combination of algorithms proposed lead to a genuine linear scaling First-Principles Molecular Dynamics method with controlled accuracy. We illustrate our approach with examples of microcanonical molecular dynamics with localized orbitals.
Date:
March 10, 2004
Creator:
Gygi, F. & Fattebert, J.
Object Type:
Article
System:
The UNT Digital Library
Effects of polar solvents on the fracture resistance of dentin: Role of water hydration
Although healthy dentin is invariably hydrated in vivo, from a perspective of examining the mechanisms of fracture in dentin, it is interesting to consider the role of water hydration. Furthermore, it is feasible that exposure to certain polar solvents, e.g., those found in clinical adhesives, can induce dehydration. In the present study, in vitro deformation and fracture experiments, the latter involving a resistance-curve (R-curve) approach (i.e., toughness evolution with crack extension), were conducted in order to assess changes in the constitutive and fracture behavior induced by three common solvents - acetone, ethanol and methanol. In addition, nanoindentation-based experiments to evaluate the deformation behavior at the level of individual collagen fibers and ultraviolet Raman spectroscopy to evaluate changes in bonding were performed. The results indicate a reversible effect of chemical dehydration, with increased fracture resistance, strength, and stiffness associated with lower hydrogen bonding ability of the solvent. These results are analyzed both in terms of intrinsic and extrinsic toughening phenomena to further understand the micromechanisms of fracture in dentin and the specific role of water hydration.
Date:
December 10, 2004
Creator:
Ritchie, R. O.; Nalla, R. K.; Balooch, M.; Ager, J. W., III; Kruzic, J. J. & Kinney, J. H.
Object Type:
Article
System:
The UNT Digital Library
Effect on scattering of complex morphology of DKDP bulk damage sites
Bulk damage sites in frequency conversion crystals scatter and/or absorb laser light leading to interference and downstream intensification .We find that laser induced bulk damage sites in DKDP exhibit a 'shell' of structurally and/or chemically modified material surrounding a central core as indicated by SEM and optical micrographs and micro Raman spectral maps. We hypothesize that the modified material has been shock wave densified and estimate the amount of densification and its effect on scattering. A simple model indicates that densification of several percent is likely and that the scattering cross section may be larger than the geometric area of the inner core by an order of magnitude.
Date:
November 10, 2004
Creator:
Carr, C W; Feit, M D; Muyco, J J & Rubenchik, A M
Object Type:
Article
System:
The UNT Digital Library
House Committee Markup: Amendment Procedure
This report focuses on the amendment procedure of the house committee markup.
Date:
November 10, 2004
Creator:
Schneider, Judy
Object Type:
Report
System:
The UNT Digital Library
Double-shell target design for the NIF: Noncryogenic ignition and nonlinear mix studies for Stockpile Stewardship
Double-shell ignition is complementary to the baseline approach by virtue of not requiring: (1) cryogenic preparation and fielding, (2) high-contrast pulse-shaping for shock-timing, and (3) demanding x-ray flux symmetry control. The use of simpler low-contrast pulse-shaping potentially allows more benign hohlraum conditions by reducing the risk of laser backscatter. In addition, the associated higher laser fluence threshold for optics damage initiation allows the possibility of more routine high-fluence shots with 2{omega} on the NIF. Based on LDRD-sponsored research in FY01-03 on NIF double-shell ignition target designs, the feasibility of this approach was advanced through both a highly successful implosion campaign on the Omega laser facility and a variety of design improvements for mitigating instability. The double-shell implosion campaign on Omega achieved the important milestone of repeatably demonstrating dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards. Showing effective control of fuel-pusher mix during final compression is an essential element for achieving ignition. In our studies to control mix by reducing hydrodynamic instability a new pathway for destructive Rayleigh-Taylor growth on the outer surface of the inner shell at ignition scales was identified. However, highly resolved multi-mode …
Date:
February 10, 2004
Creator:
Amendt, P
Object Type:
Report
System:
The UNT Digital Library
A Contamination Vulnerability Assessment for the Sacramento Area Groundwater Basin
In response to concerns expressed by the California Legislature and the citizenry of the State of California, the State Water Resources Control Board (SWRCB), implemented a program to assess groundwater quality, and provide a predictive capability for identifying areas that are vulnerable to contamination. The program was initiated in response to concern over public supply well closures due to contamination by chemicals such as MtBE from gasoline, and solvents from industrial operations. As a result of this increased awareness regarding groundwater quality, the Supplemental Report of the 1999 Budget Act mandated the SWRCB to develop a comprehensive ambient groundwater-monitoring plan, and led to the initiation of the Ambient Groundwater Monitoring and Assessment (GAMA) Program. The primary objective of the GAMA Program is to assess the water quality and to predict the relative susceptibility to contamination of groundwater resources throughout the state of California. Under the GAMA program, scientists from Lawrence Livermore National Laboratory (LLNL) collaborate with the SWRCB, the U.S. Geological Survey, the California Department of Health Services (DHS), and the California Department of Water Resources (DWR) to implement the groundwater assessment program in cooperation with local water purveyors. In 2001 and 2002, LLNL carried out this vulnerability study in …
Date:
March 10, 2004
Creator:
Moran, J. E.; Hudson, G. B.; Eaton, G. F. & Leif, R.
Object Type:
Report
System:
The UNT Digital Library
Tobacco Price Support: An Overview of the Program
None
Date:
June 10, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Visualizations in Hostile Rapid Scan Forensics
None
Date:
May 10, 2004
Creator:
Bartoletti, T
Object Type:
Article
System:
The UNT Digital Library
1400, +/- 900V PEAK PULSE SWITCH MODE POWER SUPPLIES FOR SNS INJECTION KICKERS.
This paper describes simulation and experimental results for a 1400A, {+-} 900V peak rated, switch mode power supply for SNS Injection Kicker Magnets. For each magnet (13 m{Omega}, 160{micro}H), the power supply must supply controlled pulses at 60 Hz repetition rate. The pulse current must rise from zero to maximum in less than 1 millisec in a controlled manner, flat top for up to 2 millisec, and should fall in a controlled manner to less than 4A within 500{micro}s. The low current performance during fall time is the biggest challenge in this power supply. The simulation results show that to meet the controlled fall of the current and the current ripple requirements, voltage loop bandwidth of at least 10 kHz and switching frequency of at least 100 kHz are required. To achieve high power high frequency switching with IGBT switches, a series connected topology with three phase shifted (O{sup o}, 60{sup o} & 120{sup o}) converters each with 40 kHz switching frequency (IGBT at 20kHz), has been achieved. In this paper, the circuit topology, relevant system specifications and experimental results that meet the requirements of the power supply are described in detail. A unique six pulse SCR rectifier circuit with …
Date:
March 10, 2004
Creator:
LAMBIASE,R. ENG,W. SANDBERG,J. DEWAN,S. HOLMES,R. RUST,K. ZENG,J.
Object Type:
Article
System:
The UNT Digital Library
Reciprocating Pump Systems for Space Propulsion
Small propellant pumps can reduce rocket hardware mass, while increasing chamber pressure to improve specific impulse. The maneuvering requirements for planetary ascent require an emphasis on mass, while those of orbiting spacecraft indicate that I{sub SP} should be prioritized during pump system development. Experimental efforts include initial testing with prototype lightweight components while raising pump efficiency to improve system I{sub SP}.
Date:
June 10, 2004
Creator:
Whitehead, J C
Object Type:
Article
System:
The UNT Digital Library
U.S.-Brazil WTO Cotton Subsidy Dispute
None
Date:
September 10, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
BEAM DUMP WINDOW DESIGN FOR THE SPALLATION NEUTRON SOURCE.
The Spallation Neutron Source accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. Beam tuning dumps are provided at the end of the linac (the Linac Dump) and in the Ring-to-Target transport line (the Extraction Dump) [1]. Thin windows are required to separate the accelerator vacuum from the poor vacuum upstream of the beam dump. There are several challenging engineering issues that have been addressed in the window design. Namely, handling of the high local power density deposited by the stripped electrons from the H-beam accelerated in the linac, and the need for low-exposure removal and replacement of an activated window. The thermal design of the linac dump window is presented, as is the design of a vacuum clamp and mechanism that allows remote removal and replacement of the window.
Date:
March 10, 2004
Creator:
RAPARIA,D. RANK,J. MURDOCH,G. ET AL.
Object Type:
Article
System:
The UNT Digital Library
FY2004 Consolidated Appropriations Act: Reference Guide
None
Date:
August 10, 2004
Creator:
Keith, Robert
Object Type:
Report
System:
The UNT Digital Library
Homeland Security - Reducing the Vulnerability of Public and Private Information Infrastructures to Terrorism: An Overview
This report assesses the impact of the September 11, 2001 attacks on public and private information infrastructures in the context of critical infrastructure protection, continuity of operations (COOP) planning, and homeland security.
Date:
February 10, 2004
Creator:
Seifert, Jeffrey W.
Object Type:
Report
System:
The UNT Digital Library
Correlation of Laser-Induced Damage to Phase Objects in Bulk Fused Silica
The Optical Sciences Laser (OSL) Upgrade facility, described in last year's proceedings, is a kJ-class, large aperture (100cm{sup 2}) laser system that can accommodate prototype optical components for large-scale inertial confinement fusion lasers. High-energy operation of such lasers is often limited by damage to the optical components. Recent experiments on the OSL Upgrade facility using fused silica components at 4 J/cm{sup 2} (351-nm, 3-ns) have created output surface and bulk damage sites that have been correlated to phase objects in the bulk of the material. Optical Path Difference (OPD) measurements of the phase defects indicate the probability of laser-induced damage is strongly dependent on OPD.
Date:
November 10, 2004
Creator:
Nostrand, M. C.; Cerjan, C. J.; Johnson, M. A.; Suratwala, T. I.; Weiland, T. L.; Sell, W. D. et al.
Object Type:
Article
System:
The UNT Digital Library
THE COMMISSIONING PLAN FOR THE SPALLATION NEUTRON SOURCE RING AND TRANSPORT LINES.
The Spallation Neutron Source (SNS) accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. In order to satisfy the accelerator systems' portion of the Critical Decision 4 (CD-4) commissioning goal (which marks the completion of the construction phase of the project), a beam pulse with intensity greater than 1 x 10{sup 13} protons must be accumulated in the ring, extracted in a single turn and delivered to the target. A commissioning plan has been formulated for bringing into operation and establishing nominal operating conditions for the various ring and transport line subsystems as well as for establishing beam conditions and parameters which meet the commissioning goal.
Date:
March 10, 2004
Creator:
RAPARIA,D. BLASKIEWICZ,M. LEE,Y. Y. WEI,J. ET AL.
Object Type:
Article
System:
The UNT Digital Library
Photoresponsiveness and Light Harvesting in Synthetic Nanowires, Nanosheets and Nanospheres
None
Date:
May 10, 2004
Creator:
Fox, Marye Ann & Whitesell, James
Object Type:
Report
System:
The UNT Digital Library
First tests of a Micromegas TPC in a magnetic field
Since the summer of 2003, a large Micromegas TPC prototype (1000 channels, 50 cm drift, 50 cm diameter) has been operated in a 2T superconducting magnet at Saclay. A description of this apparatus and first results from cosmic ray tests are presented. Additional measurements using simpler detectors with a laser source, an X-ray gun and radio-active sources are discussed. Drift velocity and gain measurements, electron attachment and aging studies for a Micromegas TPC are presented. In particular, using simulations and measurements, it is shown that an $Argon-CF_4$ mixture is optimal for operation at a future Linear Collider.
Date:
December 10, 2004
Creator:
Colas, P.; Giomataris, I.; Lepeltier, V. & Ronan, M.
Object Type:
Article
System:
The UNT Digital Library
Alternatives to Seesaw
The seesaw mechanism is attractive not only because it"explains'' small neutrino mass, but also because of its packaging with the SUSY-GUT, leptogenesis, Dark Matter, and electroweak symmetry breaking. However, this package has the flavor, CP, and gravitino problems. I discuss two alternatives to the seesaw mechanism. In one of them, the anomaly-mediated supersymmetry breaking solves these problems, while predicts naturally light Dirac neutrinos. In the other, the light Majorana neutrinos arise from supersymmetry breaking with right-handed neutrinos below TeV, and the Dark Matter and collider phenomenology are significantly different.
Date:
October 10, 2004
Creator:
Murayama, Hitoshi
Object Type:
Article
System:
The UNT Digital Library