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17,492 Matching Results
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0.351 micron Laser Beam propagation in High-temperature Plasmas
A study of the laser-plasma interaction processes have been performed in plasmas that are created to emulate the plasma conditions in indirect drive inertial confinement fusion targets. The plasma emulator is produced in a gas-filled hohlraum; a blue 351-nm laser beam propagates along the axis of the hohlraum interacting with a high-temperature (T{sub e} = 3.5 keV), dense (n{sub e} = 5 x 10{sup 20}cm{sup -3}), long-scale length (L {approx} 2 mm) plasma. Experiments at these conditions have demonstrated that the interaction beam produces less than 1% total backscatter resulting in transmission greater than 90% for laser intensities less than I < 2 x 10{sup 15} W-cm{sup -2}. The bulk plasma conditions have been independently characterized using Thomson scattering where the peak electron temperatures are shown to scale with the hohlraum heater beam energy in the range from 2 keV to 3.5 keV. This feature has allowed us to determine the thresholds for both backscattering and filamentation instabilities; the former measured with absolutely calibrated full aperture backscatter and near backscatter diagnostics and the latter with a transmitted beam diagnostics. A plasma length scaling is also investigated extending our measurements to 4-mm long high-temperature plasmas. At intensities I < 5 x …
Date:
December 10, 2007
Creator:
Froula, D.; Divol, L.; Meezan, N.; Ross, J.; Berger, R. L.; Michel, P. et al.
Object Type:
Report
System:
The UNT Digital Library
1-D Van der Waals Foams Heated by Ion Beam Energy Deposition
One dimensional simulations of various initial average density aluminum foams (modeled as slabs of solid metal separated by low density regions) heated by volumetric energy deposition are conducted with a Lagrangian hydrodynamics code using a van der Waals equation of tate (EOS). The resulting behavior is studied to facilitate the design of future warm dense matter (WDM) experiments at LBNL. In the simulations the energy deposition ranges from 10 to 30 kJ/g and from 0.075 to 4.0 ns total pulse length, resulting in temperatures from approximately 1 o 4 eV. We study peak pressures and temperatures in the foams, expansion velocity, and the phase evolution. Five relevant time scales in the problem are identified. Additionally, we present a method for characterizing the level of inhomogeneity in a foam target as it is heated and the time it takes for a foam to homogenize.
Date:
December 23, 2009
Creator:
Zylstra, A. B.; Barnard, J. J. & More, R. M.
Object Type:
Article
System:
The UNT Digital Library
2-D Modeling of Energy-z Beam Dynamics Using the LiTrack Matlab Program
Short bunches and the bunch length distribution have important consequences for both the LCLS project at SLAC and the proposed ILC project. For both these projects, it is important to simulate what bunch length distributions are expected and then to perform actual measurements. The goal of the research is to determine the sensitivity of the bunch length distribution to accelerator phase and voltage. This then indicates the level of control and stability that is needed. In this project I simulated beamlines to find the rms bunch length in three different beam lines at SLAC, which are the test beam to End Station A (ILC-ESA) for the ILC studies, Linac Coherent Light Source (LCLS) and LCLS-ESA. To simulate the beamlines, I used the LiTrack program, which does a 2-dimensional tracking of an electron bunch's longitudinal (z) and the energy spread beam (E) parameters. In order to reduce the time of processing the information, I developed a small program to loop over adjustable machine parameters. LiTrack is a Matlab script and Matlab is also used for plotting and saving and loading files. The results show that the LCLS in Linac-A is the most sensitive when looking at the ratio of change in …
Date:
December 15, 2005
Creator:
Cauley, S .K. & Woods, M.
Object Type:
Report
System:
The UNT Digital Library
3-D Seismic Experimentation and Advanced Processing/Inversion Development for Investigations of the Shallow Subsurface
Under ER63662, 3-D Seismic Experimentation and Advanced Processing/Inversion Development for Investigations of the Shallow Subsurface, we have completed a number of subprojects associated with the Hill Air Force Base (HAFB) high resolution 3-D reflection/tomography dataset.
Date:
December 1, 2004
Creator:
Levander, Alan R.
Object Type:
Report
System:
The UNT Digital Library
3 GeV Injector Design Handbook
This Design Handbook is intended to be the main reference book for the specifications of the 3 GeV SPEAR booster synchrotron project. It is intended to be a consistent description of the project including design criteria, key technical specifications as well as current design approaches. Since a project is not complete till it's complete changes and modifications of early conceptual designs must be expected during the duration of the construction. Therefore, this Design Handbook is issued as a loose leaf binder so that individual sections can be replaced as needed. Each page will be dated to ease identification with respect to latest revisions. At the end of the project this Design Handbook will have become the 'as built' reference book of the injector for operations and maintenance personnel.
Date:
December 16, 2009
Creator:
Wiedemann, H.
Object Type:
Report
System:
The UNT Digital Library
3-Nitropropionic Acid is a Suicide Inhibitor of MitochondrialRespiration that, Upon Oxidation by Complex II, Forms a Covalent AdductWith a Catalytic Base Arginine in the Active Site of the Enzyme
We report three new structures of mitochondrial respiratory Complex II (succinate ubiquinone oxidoreductase, E.C. 1.3.5.1) at up to 2.1 {angstrom} resolution, with various inhibitors. The structures define the conformation of the bound inhibitors and suggest the residues involved in substrate binding and catalysis at the dicarboxylate site. In particular they support the role of Arg297 as a general base catalyst accepting a proton in the dehydrogenation of succinate. The dicarboxylate ligand in oxaloacetate-containing crystals appears to be the same as that reported for Shewanella flavocytochrome c treated with fumarate. The plant and fungal toxin 3-nitropropionic acid, an irreversible inactivator of succinate dehydrogenase, forms a covalent adduct with the side chain of Arg297. The modification eliminates a trypsin cleavage site in the flavoprotein, and tandem mass spectroscopic analysis of the new fragment shows the mass of Arg 297 to be increased by 83 Da and to have potential of losing 44 Da, consistent with decarboxylation, during fragmentation.
Date:
December 1, 2005
Creator:
Huang, Li-shar; Sun, Gang; Cobessi, David; Wang, Andy C.; Shen,John T.; Tung, Eric Y. et al.
Object Type:
Article
System:
The UNT Digital Library
4-D XRD for strain in many grains using triangulation
Determination of the strains in a polycrystalline materialusing 4-D XRD reveals sub-grain and grain-to-grain behavior as a functionof stress. Here 4-D XRD involves an experimental procedure usingpolychromatic micro-beam X-radiation (micro-Laue) to characterizepolycrystalline materials in spatial location as well as with increasingstress. The in-situ tensile loading experiment measured strain in a modelaluminum-sapphire metal matrix composite using the Advanced Light Source,Beam-line 7.3.3. Micro-Laue resolves individual grains in thepolycrystalline matrix. Results obtained from a list of grains sorted bycrystallographic orientation depict the strain states within and amongindividual grains. Locating the grain positions in the planeperpendicular to the incident beam is trivial. However, determining theexact location of grains within a 3-D space is challenging. Determiningthe depth of the grains within the matrix (along the beam direction)involved a triangulation method tracing individual rays that producespots on the CCD back to the point of origin. Triangulation wasexperimentally implemented by simulating a 3-D detector capturingmultiple diffraction images while increasing the camera to sampledistance. Hence by observing the intersection of rays from multiple spotsbelonging to the corresponding grain, depth is calculated. Depthresolution is a function of the number of images collected, grain to beamsize ratio, and the pixel resolution of the CCD. The 4DXRD methodprovides grain morphologies, strain …
Date:
December 31, 2006
Creator:
Bale, Hrishikesh A.; Hanan, Jay C. & Tamura, Nobumichi
Object Type:
Article
System:
The UNT Digital Library
9/11 Commission: Current Legislative Proposals for U.S. Immigration Law and Policy
This report briefly discusses some of the major immigration areas under consideration in comprehensive reform proposals suggested by the 9/11 Commission, including asylum, biometric tracking systems, border security, document security, exclusion, immigration enforcement, and visa issuances. It refers to other CRS reports that discuss these issues in depth and will be updated as needed.
Date:
December 6, 2004
Creator:
Garcia, Michael John & Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
9-11 Commission Hearing #6, December 8, 2003, Part 1
Recording of the sixith public hearing held by the National Commission on Terrorist Attacks upon the United States on December 8, 2003 at the Russell Senate Office Building in Washington D.C. The Commission heard testimony from four panels of witnesses on domestic intelligence collection, protecting privacy while preventing terrorism, and the use of immigration laws to combat terrorism. This section includes the opening statement by Chairman Kean in addition to the first panel on intelligence collection within the United States.
Date:
December 8, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #6, December 8, 2003, Part 2
Recording of the sixith public hearing held by the National Commission on Terrorist Attacks upon the United States on December 8, 2003 at the Russell Senate Office Building in Washington D.C. The Commission heard testimony from four panels of witnesses on domestic intelligence collection, protecting privacy while preventing terrorism, and the use of immigration laws to combat terrorism.This section includes the panel on protecting privacy, preventing terrorism with testimony from Judith A. Miller, Stewart A. Baker, and Marc Rotenberg.
Date:
December 8, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #6, December 8, 2003, Part 3
Recording of the sixith public hearing held by the National Commission on Terrorist Attacks upon the United States on December 8, 2003 at the Russell Senate Office Building in Washington D.C. The Commission heard testimony from four panels of witnesses on domestic intelligence collection, protecting privacy while preventing terrorism, and the use of immigration laws to combat terrorism. This section includes that panel on preventive detention: use of immigration laws and enemy combatant designations to combat terrorism, with testimony from Jan Ting, Khaled Medhat About El Fadl, and David Martin.
Date:
December 8, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #6, December 8, 2003, Part 4
Recording of the sixith public hearing held by the National Commission on Terrorist Attacks upon the United States on December 8, 2003 at the Russell Senate Office Building in Washington D.C. The Commission heard testimony from four panels of witnesses on domestic intelligence collection, protecting privacy while preventing terrorism, and the use of immigration laws to combat terrorism. This section includes the final panel on government organizations and domestic intelligence with testimony from William P. Barr, John J. Hamre, and John MacGaffin.
Date:
December 8, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9/11 Commission: Legislative Action Concerning U.S. Immigration Law and Policy in the 108th Congress
From Summary: "This report discusses some of the major immigration areas that were under consideration in the above-mentioned comprehensive reform proposals, including asylum, biometric tracking systems, border security, document security, exclusion, immigration enforcement, and visa issuances."
Date:
December 21, 2004
Creator:
Garcia, Michael John & Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
9/11 Commission Recommendations: A Civil Liberties Oversight Board
This report discusses the recommendation made by the National Commission on Terrorist Attacks Upon the United States (9/11 Commission) regarding the creation of a board within the executive branch to oversee adherence to guidelines on, and the commitment to defend, civil liberties by the federal government.
Date:
December 22, 2004
Creator:
Relyea, Harold C.
Object Type:
Report
System:
The UNT Digital Library
9/11 Commission Recommendations: A Civil Liberties Oversight Board
From Summary: This report discusses recommendations made by the National Commission on Terrorist Attacks Upon the United States (9/11 Commission) which include: "creation of a board within the executive branch to oversee adherence to guidelines on, and commitment to defend, civil liberties by the federal government."
Date:
December 22, 2004
Creator:
Relyea, Harold C.
Object Type:
Report
System:
The UNT Digital Library
9/11 Commission Recommendations: Implementation Status
From Introduction: "This report provides a review of the 9/11 Commission recommendations and the status of their implementation at the end of the 109th Congress. The discussions herein are organized on the basis of policy themes that are core of the 9/11 Commission's recommendations, rather than a review of every numbered item set out in the Commission's final report."
Date:
December 4, 2006
Creator:
Grimmett, Richard F.
Object Type:
Report
System:
The UNT Digital Library
A 14.6 Arcsecond Quasar Lens Split by a Massive Dark Matter Halo
Gravitational lensing is a powerful tool to study the distribution of dark matter in the universe. The cold dark matter model of structure formation predicts the existence of quasars gravitationally lensed by concentrations of dark matter so massive that the quasar images would be split by over 7 inches. However, numerous searches for large-separation lensed quasars have been unsuccessful; all of the roughly 70 lensed quasars known to date, such as Q0957+561, have smaller splittings, and can be explained in terms of galaxy scale concentrations of baryonic matter that have undergone dissipative collapse. Here they report the discovery of the first large-separation lensed quasar, SDSS J1004+4112, with a maximum separation of 14.62 inches; at this separation, the lensing object must be dominated by dark matter. While gravitationally lensed galaxies of even large separation are known, large-separation quasars are more useful cosmological probes because of the simplicity of the resulting lens systems. The discovery in their current quasar sample is fully consistent with the theoretical expectations based on the cold dark matter model.
Date:
December 4, 2003
Creator:
Inada, N.; Oguri, M.; Pindor, B.; Hennawi, J.; Chiu, K.; Zheng, W. et al.
Object Type:
Article
System:
The UNT Digital Library
19-electron intermediates in the Ligand Substitution of CpW(CO)3with a Lewis Base
Odd electron species are important intermediates in organometallic chemistry, participating in a variety of catalytic and electron-transfer reactions which produce stable even-electron products. While electron deficient 17-electron (17e) radicals have been well characterized, the possible existence of short-lived 19-electron (19e) radicals has been a subject of continuing investigation. 19e radicals have been postulated as intermediates in the photochemical ligand substitution and disproportionation reactions of organometallic dimers containing a single metal-metal bond, yet the reactions of these intermediates on diffusion-limited time scales (ns-{micro}s) have never been directly observed. This study resolves the 19e dynamics in the ligand substitution of 17e radicals CpW(CO){sub 3}{sup {sm_bullet}} (Cp = C{sub 5}H{sub 5}) with the Lewis base P(OMe){sub 3}, providing the first complete description 19e reactivity.
Date:
December 14, 2005
Creator:
Cahoon, James F.; Kling, Matthias F.; Sawyer, Karma R.; Frei,Heinz & Harris, Charles B.
Object Type:
Article
System:
The UNT Digital Library
20% Wind Energy by 2030: Increasing Wind Energy's Contribution to U.S. Electricity Supply; Executive Summary (Revised)
This document is a 21-page summary of the 200+ page analysis that explores one clearly defined scenario for providing 20% of our nation's electricity demand with wind energy by 2030 and contrasts it to a scenario of no new U.S. wind power capacity.
Date:
December 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
21-PWR WASTE PACKAGE WITH ABSORBER PLATES LOADING CURVE EVALUATION
The objective of this calculation is to evaluate the required minimum burnup as a function of initial pressurized water reactor (PWR) assembly enrichment that would permit loading of spent nuclear fuel into the 21 PWR waste package with absorber plates design as provided in Attachment IV. This calculation is an example of the application of the methodology presented in the ''Disposal Criticality Analysis Methodology Topical Report'' (YMP 2003). The scope of this calculation covers a range of enrichments from 0 through 5.0 weight percent U-235, and a burnup range of 0 through 45 GWd/MTU. Higher burnups were not necessary because 45 GWd/MTU was high enough for the loading curve determination. This activity supports the validation of the use of burnup credit for commercial spent nuclear fuel applications. The intended use of these results will be in establishing PWR waste package configuration loading specifications. Limitations of this evaluation are as follows: (1) The results are based on burnup credit for actinides and selected fission products as proposed in YMP (2003, Table 3-1) and referred to as the ''Principal Isotopes''. Any change to the isotope listing will have a direct impact on the results of this report. (2) The results are based …
Date:
December 17, 2004
Creator:
Scaglione, J.M.
Object Type:
Report
System:
The UNT Digital Library
24 Command Fire Improvement Action Program Plan
Fluor Hanford (FH) is responsible for providing support to the Department of Energy Richland Operations Office (RL) in the implementation of the Hanford Emergency Preparedness (EP) program. During fiscal year 2000, a number of program improvements were identified from various sources including a major range fire (24 Command Fire). Evaluations of the emergency preparedness program have confirmed that it currently meets all requirements and that performance of personnel involved is good, however the desire to effect continuous improvement resulted in the development of this improvement program plan. This program plan defines the activities that will be performed in order to achieve the desired performance improvements.
Date:
December 1, 2000
Creator:
Griffin, G. B.
Object Type:
Report
System:
The UNT Digital Library
100-NR-2 Apatite Treatability Test FY09 Status: High Concentration Calcium-Citrate-Phosphate Solution Injection for In Situ Strontium-90 Immobilization
100-NR-2 Apatite Treatability Test FY09 Status: High Concentration Calcium-Citrate-Phosphate Solution Injection for In Situ Strontium-90 Immobilization INTERIM LETTER REPORT
Date:
December 16, 2009
Creator:
Vermeul, Vincent R.; Fritz, Brad G.; Fruchter, Jonathan S.; Szecsody, James E. & Williams, Mark D.
Object Type:
Report
System:
The UNT Digital Library
120 MW, 800 MHz Magnicon for a Future Muon Collider
Development of a pulsed magnicon at 800 MHz was carried out for the muon collider application, based on experience with similar amplifiers in the frequency range between 915 MHz and 34.3 GHz. Numerical simulations using proven computer codes were employed for the conceptual design, while established design technologies were incorporated into the engineering design. A cohesive design for the 800 MHz magnicon amplifier was carried out, including design of a 200 MW diode electron gun, design of the magnet system, optimization of beam dynamics including space charge effects in the transient and steady-state regimes, design of the drive, gain, and output cavities including an rf choke in the beam exit aperture, analysis of parasitic oscillations and design means to eliminate them, and design of the beam collector capable of 20 kW average power operation.
Date:
December 15, 2005
Creator:
Hirshfield, Jay L.
Object Type:
Report
System:
The UNT Digital Library
160 C PROTON EXCHANGE MEMBRANE (PEM) FUEL CELL SYSTEM DEVELOPMENT
The objectives of this program were: (a) to develop and demonstrate a new polymer electrolyte membrane fuel cell (PEMFC) system that operates up to 160 C temperatures and at ambient pressures for stationary power applications, and (b) to determine if the GTI-molded composite graphite bipolar separator plate could provide long term operational stability at 160 C or higher. There are many reasons that fuel cell research has been receiving much attention. Fuel cells represent environmentally friendly and efficient sources of electrical power generation that could use a variety of fuel sources. The Gas Technology Institute (GTI), formerly Institute of Gas Technology (IGT), is focused on distributed energy stationary power generation systems. Currently the preferred method for hydrogen production for stationary power systems is conversion of natural gas, which has a vast distribution system in place. However, in the conversion of natural gas into a hydrogen-rich fuel, traces of carbon monoxide are produced. Carbon monoxide present in the fuel gas will in time cumulatively poison, or passivate the active platinum catalysts used in the anodes of PEMFC's operating at temperatures of 60 to 80 C. Various fuel processors have incorporated systems to reduce the carbon monoxide to levels below 10 ppm, …
Date:
December 21, 2001
Creator:
Marianowski, L. G.
Object Type:
Report
System:
The UNT Digital Library