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7,182 Matching Results
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WTO Dispute Settlement: Status of U.S. Compliance in Pending Cases
None
Date:
January 22, 2007
Creator:
Grimmett, Jeanne J.
Object Type:
Report
System:
The UNT Digital Library
WTO Doha Round: The Agricultural Negotiations
None
Date:
January 22, 2007
Creator:
Hanrahan, Charles E. & Schnepf, Randy
Object Type:
Report
System:
The UNT Digital Library
The WTO, Intellectual Property Rights, and the Access to Medicines Controversy
None
Date:
January 22, 2008
Creator:
Fergusson, Ian F.
Object Type:
Report
System:
The UNT Digital Library
Wynn BRAC Weekly Update to SECDEF (14 Apr 05)
DISREGARD RESTRICTION HEADER AND/OR FOOTER. Subject: Under Secretary of Defense (Acquisition, Technology and Logistics) Michael Wynn's Weekly Status Report (April 14, 2005) and Additional Information to Secretary of Defense Rumsfeld (REDACTED)
Date:
June 22, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
X-Band Crab Cavities for the CLIC Beam Delivery System
The CLIC machine incorporates a 20 mrad crossing angle at the IP to aid the extraction of spent beams. In order to recover the luminosity lost through the crossing angle a crab cavity is proposed to rotate the bunches prior to collision. The crab cavity is chosen to have the same frequency as the main linac (11.9942 GHz) as a compromise between size, phase stability requirements and beam loading. It is proposed to use a HE11 mode travelling wave structure as the CLIC crab cavity in order to minimise beam loading and mode separation. The position of the crab cavity close to the final focus enhances the effect of transverse wake-fields so effective wake-field damping is required. A damped detuned structure is proposed to suppress and de-cohere the wake-field hence reducing their effect. Design considerations for the CLIC crab cavity will be discussed as well as the proposed high power testing of these structures at SLAC. Design of a crab cavity for CLIC is underway at the Cockcroft Institute in collaboration with SLAC. This effort draws on a large degree of synergy with the ILC crab cavity developed at the Cockcroft Institute and other deflecting structure development at SLAC. A …
Date:
November 22, 2011
Creator:
Burt, G.; Ambattu, P. K.; Dexter, A. C.; Abram, T.; Dolgashev, V.; Tantawi, S. et al.
Object Type:
Article
System:
The UNT Digital Library
X-Band RF Gun Development
In support of the MEGa-ray program at LLNL and the High Gradient research program at SLAC, a new X-band multi-cell RF gun is being developed. This gun, similar to earlier guns developed at SLAC for Compton X-ray source program, will be a standing wave structure made of 5.5 cells operating in the pi mode with copper cathode. This gun was designed following criteria used to build SLAC X-band high gradient accelerating structures. It is anticipated that this gun will operate with surface electric fields on the cathode of 200 MeV/m with low breakdown rate. RF will be coupled into the structure through a final cell with symmetric duel feeds and with a shape optimized to minimize quadrupole field components. In addition, geometry changes to the original gun, operated with Compton X-ray source, will include a wider RF mode separation, reduced surface electric and magnetic fields.
Date:
June 22, 2012
Creator:
Vlieks, Arnold; Dolgashev, Valery; Tantawi, Sami; Anderson, Scott; Hartemann, Fred & Marsh, Roark
Object Type:
Article
System:
The UNT Digital Library
X-ray absorption near-edge spectroscopy of plutonium solid species.
We present XANES at the L{sub III} edge for four plutonium solid phases: Pu(III)F{sub 3}, Pu(IV)O{sub 2}, NaPu(V)O{sub 2}CO{sub 3}, and Ba{sub 3}Pu(VI)O{sub 6}. These correspond to the four important oxidation states in the process chemistry and environmental chemistry of plutonium. By a fitting method that uses an arc tangent function and gaussian curves, it was possible to reproducibly determine the edge energy and distinguish among the four oxidation states. These data demonstrate a 1.85 {+-} 0.20 eV shift per oxidation state.
Date:
October 22, 1998
Creator:
Kropf, A. J.
Object Type:
Article
System:
The UNT Digital Library
X-ray Conversion Efficiency of high-Z hohlraum wall materials for indirect drive ignition
We measure the conversion efficiency of 351 nm laser light to soft x-rays (0.1-5 keV) for Au, U and high Z mixtures 'cocktails' used for hohlraum wall materials in indirect drive ICF. We use spherical targets in a direct drive geometry, flattop laser pulses and laser smoothing with phase plates to achieve constant and uniform laser intensities of 10{sup 14} and 10{sup 15} W/cm{sup 2} over the target surface that are relevant for the future ignition experiments on NIF. The absolute time and spectrally-resolved radiation flux is measured with a multichannel soft x-ray power diagnostic. The conversion efficiency is then calculated by dividing the measured x-ray power by the incident laser power from which the measured laser backscattering losses is subtracted. After {approx}0.5 ns, the time resolved x-ray conversion efficiency reaches a slowly increasing plateau of 95% at 10{sup 14} W/cm{sup 2} laser intensity and of 80% at 10{sup 15} W/cm{sup 2}. The M-band flux (2-5 keV) is negligible at 10{sup 14} W/cm{sup 2} reaching {approx}1% of the total x-ray flux for all target materials. In contrast, the M-band flux is significant and depends on the target material at 10{sup 15} W/cm{sup 2} laser intensity, reaching values between 10% of …
Date:
February 22, 2008
Creator:
Dewald, E; Rosen, M; Glenzer, S H; Suter, L J; Girard, F; Jadaud, J P et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray diffraction diagnostic design for the National Ignition Facility
None
Date:
August 22, 2013
Creator:
Ahmed, M F; Ayers, J; House, A; Lamb, Z; Swift, R & Swift, D
Object Type:
Article
System:
The UNT Digital Library
X-ray fluorescence technique for measuring coating thickness
An x-ray fluorescence technique has been evaluated for measuring the coating thickness of two coating-substrate combinations. A quantitative theory has been developed in conjunction with the experimental data to support the results of the investigation. Results of measurements of zinc coatings on iron and nickel coatings on uranium are given. (auth)
Date:
February 22, 1974
Creator:
Coulter, J.E.
Object Type:
Report
System:
The UNT Digital Library
X-ray interferometry development at the Advanced Photon Source.
In this paper, we report initial test results of a four-bounce Bragg reflection X-ray interferometer at 7.46 keV and, for the first time to our knowledge, at the higher energy of 14.91 keV where the spectral acceptance is much smaller.
Date:
November 22, 1999
Creator:
Fezzaa, K. & Lee, W. K.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Line-Shape Diagnostics and Novel Stigmatic Imaging Schemes for the National Ignition Facility
None
Date:
June 22, 2011
Creator:
Bitter, M; Hill, K W; Pablant, N A; Delgado-Aparicio, L F; Beiersdorfer, P; Dunn, J et al.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals
The deformation behavior of BCC metals is being investigated by x-ray microdiffraction measurements (mu XRD) for the purpose of characterizing the dislocation structure that results from uniaxial compression experiments. The high brilliance synchrotron source at the Advanced Light Source (Lawrence Berkeley National Lab) and the micron resolution of the focusing optics allow for the mapping of Laue diffraction patterns across a sample. These measurements are then analyzed in order to map the distribution of residual stresses in the crystal. An important finding is the observation of Laue spot ''streaking'', which indicates localized rotations in the lattice. These may represent an accumulation of same-sign dislocations. Theoretical modeling of the diffraction response for various slip systems is presented, and compared to experimental data. Preliminary results include orientation maps from a highly strained Ta bicrystal and a less highly strained Mo single crystal. The orientation maps of the bicrystal indicate a cell-like structure of dense dislocation walls. This deformation structure is consistent with previous OIM studies of the same crystal. The results suggest that mu XRD may be a particularly useful tool for microscale studies of deformation patterns in a multi-scale investigation of the mechanisms of deformation that ranges from macroscopic deformation tests …
Date:
November 22, 2004
Creator:
Magid, K. R.; Lilleodden, E. T.; Tamura, N.; Florando, J. N.; Lassila, D. H.; LeBlanc, M. M. et al.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Photoionized Plasmas in the Laboratory
The advanced spectroscopic capabilities of the new X-ray telescopes Chandra and XMM lead to a need for improved benchmarking of models for the photoionized accretion-disk plasmas which represent over half of known astrophysical X-ray sources. They report the first laboratory experimental results using 120 TW, 180 eV Z-pinch plasmas to drive iron samples into the photoionized equilibrium. The pinch spectrum, temperature, power and uniformity have been characterized in order to qualify it as a photoionization driver. Preliminary time-integrated (8 {angstrom} to 18 {angstrom}) and time-resolved (12.5 {angstrom} to 16 {angstrom}) absorption and emission spectra of photoionized L-shell Fe and K-shell Na and F were observed using X-ray crystal spectrometers. Plans for upcoming experiments are also discussed.
Date:
April 22, 2000
Creator:
Heeter, R. F.; Foord, M. E.; Thoe, R. S.; Emig, J. A.; Springer, P. T.; Bailey, J. et al.
Object Type:
Article
System:
The UNT Digital Library
The X-Ray Spectra of the Last-Row Elements
Abstract: X-ray energy level diagrams as given in the literature are tabulated for radium, thorium and uranium. A level scheme for protoactinium is derived from the published data. After a brief review of the use of X-ray data in studying outer electronic structure, it is pointed out that differences in the X-ray spectra should exist depending on whether the outer electrons are in f or d orbitals. The observed separation of the OI and OII levels in thorium and uranium indicated that the f levels lie lower than the d. This hypothesis also provides a reasonable explanation for the observed differences between the MIV and MV absorption edges and MIV and MV levels calculated from the emission spectra and the LIII edge.
Date:
October 22, 1946
Creator:
Russell, H., Jr.
Object Type:
Report
System:
The UNT Digital Library
XFD progress report.
In May 2002, the Advanced Photon Source (APS) was reorganized into three divisions: the Accelerator Systems Division (ASD), the APS Operations Division (AOD), and the Experimental Facilities Division (XFD). Parts of the former User Program Division (UPD) were incorporated into XFD; other parts were incorporated into AOD. This Progress Report summarizes the main scientific and technical activities of XFD and parts of the former UPD from January 2001 through June 2002. The report is divided into two major sections, (1) SRI-CAT Beamlines, Technical Developments, and Scientific Applications, and (2) User Technical Support, which describe the technical activities and research and development (R&D) accomplishments of the XFD and former UPD personnel in supporting the synchrotron radiation instrumentation (SRI) collaborative access team (CAT) and the general APS user community. Also included in this report is a comprehensive list of publications by XFD and UPD staff members during the time period covered by this report.
Date:
January 22, 2003
Creator:
Gluskin, E.
Object Type:
Report
System:
The UNT Digital Library
Yakima Habitat Improvement Project Master Plan, Technical Report 2003.
The Yakima Urban Growth Area (UGA) is a developing and growing urban area in south-central Washington. Despite increased development, the Yakima River and its tributaries within the UGA continue to support threatened populations of summer steelhead and bull trout as well as a variety of non-listed salmonid species. In order to provide for the maintenance and recovery of these species, while successfully planning for the continued growth and development within the UGA, the City of Yakima has undertaken the Yakima Habitat Improvement Project. The overall goal of the project is to maintain, preserve, and restore functioning fish and wildlife habitat within and immediately surrounding the Yakima UGA over the long term. Acquisition and protection of the fish and wildlife habitat associated with key properties in the UGA will prevent future subdivision along riparian corridors, reduce further degradation or removal of riparian habitat, and maintain or enhance the long term condition of aquatic habitat. By placing these properties in long-term protection, the threat of development from continued growth in the urban area will be removed. To most effectively implement the multi-year habitat acquisition and protection effort, the City has developed this Master Plan. The Master Plan provides the structure and guidance …
Date:
April 22, 2003
Creator:
Golder Associates, Inc.
Object Type:
Report
System:
The UNT Digital Library
The year 2000 computer problem and international security
The Year 2000 computer problem (Y2K) is a widespread software issue that can affect all computers form the tiniest "embedded" microprocessor to the largest mainframe computer. There are a number of causes of this problem, the most frequent being the use of two digits instead of four to represent the year. As the century digits change from 19 to 20 there is a very real possibility that programs will make errors when processing dates. This paper discusses the origin of the problem, looks into symptoms and failure modes, describes how organizations are attacking the problem, and then spends some time discussing the international security aspects.
Date:
January 22, 1999
Creator:
Lehman, R. F. & Trost, S.
Object Type:
Report
System:
The UNT Digital Library
The Year 2000 Computer Problem: Congressional Issues
Many computers were designed to store a two-digit number for the year, which makes the year 2000 indistinguishable from 1900. Unless they are corrected, many computers will not be able to process dates beyond the year 2000, and may cause many costly problems in commerce and government. In the 106th Congress, hearings are being held and will continue to provide the public with the most accurate information available on the status of Y2K remediations at federal agencies, state and local agencies, private sector entities, and international organizations. Congress may also consider additional legislation to ensure that private sector systems are compliant, to establish emergency preparedness measures to address problems that might occur, and to limit liability associated with Y2K failures for manufacturers and industry groups.
Date:
April 22, 2009
Creator:
Nunno, Richard M.
Object Type:
Report
System:
The UNT Digital Library
Year 2000 Computing Challenge: Estimated Costs, Planned Uses of Emergency Funding, and Future Implications
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the costs associated with the year 2000 problem, focusing on: (1) estimated year 2000 costs and agency processes to track costs to date; (2) planned uses of emergency funding; (3) year 2000 costs for fiscal year (FY) 2000 and beyond; (4) agency program and information technology (IT) initiatives delayed by year 2000 activities; and (5) lessons learned from year 2000 efforts that can be applied to other IT activities."
Date:
June 22, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Year 2000 Computing Challenge: FBI Needs to Complete Business Continuity Plans
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Federal Bureau of Investigation's (FBI) plans and controls for year 2000 business continuity planning, focusing on: (1) the status of and plans for completing the FBI's contingency planning for continuity of operations; and (2) whether the FBI's contingency planning efforts satisfy the key processes in GAO's year 2000 business continuity and contingency planning guide."
Date:
October 22, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Yemen: Background and U.S. Relations
This report provides an overview and analysis of U.S.-Yemeni relations, including issues such as: political change in Yemeni leadership; ongoing U.S. counterterrorism operations against Al Qaeda in the Arabian Peninsula (AQAP) operatives at large in Yemen's hinterlands; and international efforts to bolster the country's stability despite an array of daunting socio-economic problems. Congress and U.S. policymakers may be concerned with prospects for stabilizing Yemen and establishing strong bilateral relations with future Yemeni leaders.
Date:
March 22, 2011
Creator:
Sharp, Jeremy M.
Object Type:
Report
System:
The UNT Digital Library
Yemen: Background and U.S. Relations
This report summarizes Yemen's domestic situation, foreign relations, and ties with the United States. With limited natural resources, a crippling illiteracy rate, and high population growth, Yemen faces an array of daunting development challenges that some observers believe make it at risk for becoming a failed state in the next few decades.
Date:
January 22, 2009
Creator:
Sharp, Jeremy M.
Object Type:
Report
System:
The UNT Digital Library
YMP Engineered Barrier Systems Scaled Ventilation Testing
Yucca Mountain, approximately 100 miles northwest of Las Vegas, Nevada, has been selected as the site for the nation's first geologic repository for high level nuclear waste. The Yucca Mountain Project (YMP) is currently developing the design for the underground facilities. Ventilation is a key component of the design as a way to maintain the desired thermal conditions in the emplacement drifts prior to closure. As a means of determining the effects of continuous ventilation on heat removal from the emplacement drifts two series of scaled ventilation tests have been performed. Both test series were performed in the DOE/North Las Vegas Atlas facility. The tests provided scaled (nominally 25% of the full scale emplacement drift design) thermal and flow process data that will be used to validate YMP heat and mass transport codes. The Phase I Ventilation Test series evaluated the ability of ambient ventilation air to remove energy under varying flow and input power conditions. The Phase II Ventilation Test series evaluated the ability of pre-conditioned ventilation air to remove energy under varying flow, input temperature and moisture content, and simulated waste package input power conditions. Twenty-two distinct ventilation tests were run.
Date:
November 22, 2002
Creator:
Dunn, S.D.; Lowry, B.; Walsh, B.; Mar, J.D.; Howard, C.; Johnston, R. et al.
Object Type:
Report
System:
The UNT Digital Library