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8,808 Matching Results
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Wrench.
Patent for a wrench with a head having a pair of rigid jaws to engage the object. One unique use of this wrench is that it can tighten any threaded joint beyond the degree of tightness that can be obtained by pulling the handle of an ordinary wrench in the usual manner.
Date:
July 19, 1921
Creator:
Duda, Oswald
Object Type:
Patent
System:
The Portal to Texas History
Wrench.
Patent for wrench related device "for locking the gripping element after it is applied to the pipe or other pipe (lines 14-15)" including instructions and illustration.
Date:
October 19, 1915
Creator:
Black, Lee J.
Object Type:
Patent
System:
The Portal to Texas History
WTO Disciplines on U.S. Domestic Support for Agriculture
This report outlines the rules and disciplines the United States has committed to abide by as a member of the World Trade Organization (WTO).
Date:
September 19, 2018
Creator:
Schnepf, Randy
Object Type:
Report
System:
The UNT Digital Library
X-ray characterization of a four-bounce projection system
A four-bounce two-element projection system designed to achieve 0.14 {mu}m resolution over a 1.2 {times} 5 mm{sup 2} ring field has been fabricated. The radiation transport properties of both the individual multilayer-coated optics and the assembled system has been measured. The individual mirror measurements demonstrated that the coatings were within 0.03 nm of d-spacing specifications; however, the mirrors exhibited significant scatter which reduced reflectance below the design specification of 60%. The peak radiation transport efficiency of the assembled projector was 7% at 13.2 nm. To the best of the authors` knowledge, this represented the first measurement of the radiation transport efficiency of a multi-element optical system for EUV lithography. Experiments performed at LLNL`s front-end test bed facility were consistent with the measured transport efficiency.
Date:
January 19, 1995
Creator:
Gaines, D. P.; Vernon, S. P.; Sommargren, G. E. & Fuchs, D.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Emission Cross Sections following Charge Exchange by Multiply-Charged Ions of Astrophysical Interest
State selective nl-electron capture cross sections are presented for highly charged ions with Z = 6-10 colliding with atoms and molecules. The energy range investigated was from 1 eV/amu (v = 0.006 a.u.) to 100 keV/amu (v =2.0 a.u.). The energy dependence of the l-level populations is investigated. The K-shell x-ray emission cross sections are determined by using the calculated state-selective electron capture results as input and then applying hydrogenic branching and cascading values for the photon emission. A major shift in the line emission from being almost solely Lyman-{alpha} transitions at the highest collisions energies to strong high-n to 1s transitions at the lowest energies is observed. The calculated cross sections are in reasonable accord with measurements made by Greenwood et al, Phys. Rev. A 63, 062707 (2001), using O{sup 8+} and Ne{sup 10+} on various targets at 3 keV/amu. The calculations are also in accord with x-ray emission cross section data obtained on the EBIT machine at LLNL where O{sup 8+} and Ne{sup 10+} high resolution measurements were made at a temperature of 10 eV/amu for a series of targets with varying ionization potentials. The Ne{sup 10+} data clearly shows the contribution from multiple capture followed by Auger …
Date:
September 19, 2005
Creator:
Otranto, S; Olson, R E & Beiersdorfer, P
Object Type:
Article
System:
The UNT Digital Library
X-ray Emission from Electron Betatron Motion in a Laser-Plasma Accelerator
Single-shot x-ray spectra from electron bunches produced by a laser-plasma wakefield accelerator (LPA) were measured using a photon-counting single-shot pixelated Silicon-based detector [3], providing for the first time direct spectra without assumptions required by filter based techniques. In addition, the electron bunch source size was measured by imaging a wire target, demonstrating few micron source size and stability. X-rays are generated when trapped electrons oscillate in the focusing field of the wake trailing the driver laser pulse. In addition to improving understanding of bunch emittance and wake structure, this provides a broadband, synchronized femtosecond source of keV x-rays. Electron bunch spectra and divergence were measured simultaneously and preliminary analysis shows correlation between x-ray andelectron spectra. Bremsstrahlung background was managed using shielding and magnetic diversion.
Date:
July 19, 2011
Creator:
Plateau, Guillaume; Geddes, Cameron; Thorn, Daniel; Matlis, Nicholas; Mittelberger, Daniel; Stoehlker, T et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray laser `` oscillator-amplifier`` experiments
We present results from experiments directed toward increasing the degree of transverse coherence in x-ray laser beams. We have concentrated on the neon-like yttrium (Z=39) collisionally-pumped x-ray laser as the test system for these studies because of its unique combination of brightness, monochromaticity, and high-reflectivity optics availability. Attempts at improving laser performance using proximate feedback optics failed. Modest success has been found to date in ``double foil`` experiments, involving two x-ray lasers spatially separated by 29 cm and shot sequentially in an ``oscillator-amplifier`` configuration.
Date:
March 19, 1993
Creator:
Shimkaveg, G. M.; Carter, M. R.; Young, B. K. F.; Walling, R. S.; Osterheld, A. L.; Trebes, J. E. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray lines as a density diagnostic in DT plasmas near 100x solid density
The use of electron impact broadened resonance lines to diagnose near-term high density diagnostics is discussed. In particular, the question of how to choose seed and pusher materials to have discernible broadening effects while maintaining line visibility is discussed.
Date:
October 19, 1977
Creator:
Bailey, D.S.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Powder Diffraction Study of Synthetic Palmierite, K{sub 2}Pb(SO{sub 4}){sub 2}
Palmierite (K{sub 2}Pb(SO{sub 4}){sub 2}) has been prepared via a chemical synthesis method. Intensity differences were observed when X-ray powder data from the newly synthesized compound were compared to the published powder diffraction card (PDF) 29-1015 for Palmierite. Investigation of these differences indicated the possibility of preferred orientation and/or chemical inhomogeneity affecting intensities, particularly those of the basal (00{ell}) reflections. Annealing of the Palmierite was found to reduce the effects of preferred orientation. Electron microprobe analysis confirmed K:Pb:S as 2:1:2 for the annealed Palmierite powder. Subsequent least-squares refinement and Rietveld analysis of the annealed powder showed peak intensities very close to that of a calculated Palmierite pattern (based on single crystal data), yet substantially higher than many of the PDF 29-1015 published intensities. Further investigation of peak intensity variation via calculated patterns suggested that the intensity discrepancies between the annealed sample and those found in PDF 29-1015 were potentially due to chemical variation in the K{sub 2}Pb(SO{sub 4}){sub 2} composition. X-ray powder diffraction and crystal data for Palmierite are reported for the annealed sample. Palmierite is Trigonal/Hexagonal with unit cell parameters a = 5.497(1){angstrom}, c = 20.864(2) {angstrom}, space group R-3m (166), and Z = 3.
Date:
December 19, 2000
Creator:
Tissot, Ralph G., Jr.; Rodriguez, Mark A.; Sipola, Diana L. & Voigt, James A.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Raman Spectroscopy of High-Pressure Phases and Novel Materials derived from Low-Z Compounds
None
Date:
December 19, 2004
Creator:
Evans, W. J.; Eng, P. J.; Maddox, B.; Newville, M.; Baer, B.; Cynn, H. et al.
Object Type:
Report
System:
The UNT Digital Library
X-ray resonant magnetic scattering investigations of hexagonal multiferroics RMnO3 (R = Dy, Ho, Er)
Electricity and magnetism were unified into a common subject by James Clerk Maxwell in the nineteenth century yielding the electromagnetic theory. Four equations govern the dynamics of electric charges and magnetic fields, commonly known as Maxwell's equations. Maxwell's equations demonstrate that an accelerated charged particle can produce magnetic fields and a time varying magnetic field can induce a voltage - thereby linking the two phenomena. However, in solids, electric and magnetic ordering are most often considered separately and usually with good reason: the electric charges of electrons and ions are responsible for the charge effects, whereas the electron spin governs magnetic properties.
Date:
December 19, 2009
Creator:
Nandi, Shibabrata
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
X-ray spectroscopy of xenon. Final report
A high-resolution x-ray spectrometer was constructed and fielded at the National Laser Users Facility at the Laboratory for Laser Energetics, University of Rochester. The spectrometer was attached to a streak camera and time-resolved x-ray spectra recorded. The targets were irradiated by the 24-beam Omega laser and consisted of CH microballoons filled with DD, argon, and xenon. The x-ray spectral lines from Ar and Xe were used to determine the plasma properties of the compressed core region.
Date:
January 19, 1994
Creator:
Feldman, U.
Object Type:
Report
System:
The UNT Digital Library
XE-1 control drum pneumatic actuator
None
Date:
September 19, 1969
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Year 2000 Computing Crisis: Readiness Improving But Much Work Remains to Ensure Delivery of Critical Services
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the year 2000 risks facing the nation, focusing on: (1) the federal government's progress and remaining challenges in correcting its systems; (2) state and local government year 2000 issues; and (3) an overview of the available information on the readiness of key public infrastructure and economic sectors."
Date:
April 19, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Year 2000 Computing Crisis: Readiness of the Oil and Gas Industries
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO identified the oil and gas power industries' vulnerability to year 2000 problems and the reported status of their year 2000 readiness."
Date:
May 19, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Year 2000 Computing Crisis: The District of Columbia Remains Behind Schedule
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the challenges facing the District of Columbia in addressing the year 2000 problem, focusing on: (1) the District of Columbia's progress in fixing its information systems; and (2) the risks it now faces."
Date:
February 19, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Yemen: Background and U.S. Relations
This report provides an overview and analysis of U.S.-Yemeni relations and issues, including evolving 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.
Date:
November 19, 2014
Creator:
Sharp, Jeremy M.
Object Type:
Report
System:
The UNT Digital Library
Yucca Mountain Project: Information on Estimated Costs to Respond to Employee E-Mails That Raised Questions about Quality Assurance
Correspondence issued by the Government Accountability Office with an abstract that begins "In March 2005, the Department of Energy (DOE) reported the discovery of a series of e-mail messages written in the late 1990s by U.S. Geological Survey (USGS) employees working under a contract with DOE on the Yucca Mountain Project. These e-mails alerted DOE that USGS workers may have falsified records for scientific work on the project and may have been disdainful of the project's quality assurance program and its requirements. In March 2006, we reported that DOE was engaged in a detailed review of these and other project e-mails and was reworking technical documents to ensure the credibility of the USGS's scientific analyses, particularly its conclusions on water infiltration. At Congress' request, we undertook follow-on work to determine the estimated costs incurred in DOE's response, which also included additional management and quality assurance training for project personnel. We briefed Congressional staff on October 23, 2006, on the results of this work. As Congress requested, we also briefed Congressional staff on the estimated cost of completing the Yucca Mountain Project, based on DOE's new schedule for receiving a license and opening the nuclear waste repository by 2017."
Date:
January 19, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Yucca Mountain Project Subsurface Facilities Design
Four units of the Topopah Springs formation (volcanic tuff) are considered for the proposed repository: the upper lithophysal, the middle non-lithophysal, the lower lithophysal, and the lower non-lithophysal. Yucca Mountain was recently designated the site for a proposed repository to dispose of spent nuclear fuel and high-level radioactive waste. Work is proceeding to advance the design of subsurface facilities to accommodate emplacing waste packages in the proposed repository. This paper summarized recent progress in the design of subsurface layout of the proposed repository. The original Site Recommendation (SR) concept for the subsurface design located the repository largely within the lower lithophysal zone (approximately 73%) of the Topopah The Site Recommendation characterized area suitable for emplacement consisted of the primary upper block, the lower block and the southern upper block extension. The primary upper block accommodated the mandated 70,000 metric tons of heavy metal (MTHM) at a 1.45 kW/m hear heat load. Based on further study of the Site Recommendation concept, the proposed repository siting area footprint was modified to make maximum use of available site characterization data, and thus, reduce uncertainties associated with performance assessment. As a result of this study, a modified repository footprint has been proposed and is …
Date:
November 19, 2002
Creator:
Linden, A.; Saunders, R. S.; Boutin, R. J.; Harrington, P. G.; Lachman, K. D. & Trautner, L. J.
Object Type:
Report
System:
The UNT Digital Library
Yucca Mountain Project total-system performance assessment preliminary analyses: Overview; Draft
Sandia National Laboratories and Pacific Northwest Laboratory have produced a coordinated initial total-system performance assessment analysis for the potential repository at Yucca Mountain. Analyses included radionuclide transport via groundwater and gas flow, human intrusion, tectonism, and basaltic igneous intrusion. Both abstracted and detailed calculations were used for the analyses. Probabilistic release distributions were calculated for the individual components, and a combined distribution for the overall behavior of the system was constructed. Results from the analyses using abstracted models indicate that this method produces reasonable outcomes based on our current understanding of the site.
Date:
December 19, 1991
Creator:
Barnard, R. W. & Dockery, H. A.
Object Type:
Article
System:
The UNT Digital Library
Yucca Mountain Site Characterizations Project Tunnel Boring Machine (Tbm) System Safety Analysis
The purpose of this analysis is to systematically identify and evaluate hazards related to the tunnel boring machine (TBM) used in the Exploratory Studies Facility (ESF) at the Yucca Mountain Site Characterization Project. This process is an integral part of the systems engineering process; whereby safety is considered during planning, design, testing, and construction. Since the TBM is an ''as built'' system, the M&O is conducting the System Safety Analysis during the construction or assembly phase of the TBM. A largely qualitative approach was used since a radiological System Safety Analysis is not required. The risk assessment in this analysis characterizes the accident scenarios associated with the TBM in terms of relative risk and includes recommendations for mitigating all identified risks. The priority for recommending and implementing mitigation control features is: (1) Incorporate measures to reduce risks and hazards into the system/subsystem/component design, (2) add safety features and capabilities to existing designs, and (3) develop procedures and conduct training to increase worker awareness of potential hazards, on methods to reduce exposure to hazards, and on the actions required to avoid accidents or correct hazardous conditions. The scope of this analysis is limited to the TBM during normal operations, excluding hazards …
Date:
February 19, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
D-Zero Central Calorimeter Technical Appendix to Cryogenic Pressure Vessels
DO (D Zero) is a large Liquid Argon (LAr) HEP Calorimeter designed to function in the laboratories P-Pbar collider at the DO section of the Tevatron accelerator. It contains 5,000 gls. of LAr in the CC cryostat, and 3,000 gls. in each of two, a north and south, EC cryostats. These low pressure vessels are filled with detector modules built of stainless steel, copper and depleted uranium. The LAr functions as the ionization medium, and the spatial and temporal of the collection of the charge of the electrons produced signals the passsage of charged particles. The collection of these charges in 4 pi is related to the energy of the particles, and their measurement is called calorimetry. The contained LAr (T=90K) is isolated from the ambient temperatures in specially designed, vacuum and superinsulated, vessels (cryostats) provided with liquid nitrogen, heat of vaporization, cooling.
Date:
November 19, 1990
Creator:
Mulholland, G. T. & Rucinski, R. A.
Object Type:
Report
System:
The UNT Digital Library
D-Zero Project Rotary Bayonet Assembly Test
This report documents the testing of a rotating bayonet assembly. It provides the details of how the test was carried out and the results of the testing. The testing was done on a mock up of an 1 1/2-inch x 3-inch gaseous argon bayonet assembly designed to allow a translational movement of 40-inches. The test was necessary to provide a level of confidence in the design concept The testing was a success. It provided confidence that the bayonet assembly design will work for the 1 1/2-inch x 3-inch pipe size. No leaks were detected during any of the testing. The o-ring seals did not leak when the bayonet assembly was misaligned. The force required to move the assembly was 15 to 60+ pounds force. This seems reasonable. No binding was observed with the misalignments. The misalignments were up to 2.7 degrees from true vertical. This misalignment is noticeable to the casual observer and should be greater than carefully installed field piping. The goal of the rotary bayonet assembly test was to: (1) Determine that the seals in the bayonet are sealing while it is being rotated; (2) Determine the effect misalignment of the bayonets from a true vertical has on …
Date:
April 19, 1991
Creator:
Rucinski, R.
Object Type:
Report
System:
The UNT Digital Library
Zirconium hydride fuel element performance characteristics
None
Date:
June 19, 1973
Creator:
Lillie, A. F.; McClelland, D. T.; Roberts, W. J. & Walter, J. H.
Object Type:
Report
System:
The UNT Digital Library