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131
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59
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46
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42
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Shielding of a hadron in a finite e-beam
The thorough study of coherent electron cooling, the modern cooling technique capable to deal with accelerators operating in the range of few TeVs, rises many interesting questions. One of them is a shielding dynamics of a hadron in an electron beam. Now this effect is computed analytically in the infinite beam approximation. Many effects are drastically different in finite and infinite plasmas. Here we propose a method to compute the dynamical shielding effect in a finite cylindrical plasma - the realistic model of an electron beam in accelerators.
Date:
May 20, 2012
Creator:
A., Elizarov; Litvinenko, V. & Wang, G.
Object Type:
Article
System:
The UNT Digital Library
Search for Strong Gravity Signatures in Same-Sign Dimuon Final States Using the ATLAS Detector at the LHC
None
Date:
May 20, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Stressmeter Placement at Spent Fuel Test in Climax Granite
Vibrating wire stressmeters were installed in the Spent Fuel Facility at the Nevada Test Site. These stressmeters will measure the changes in in situ stress during the five-year spent fuel test. Before installation, laboratory tests were conducted to study reproducibility of placement and to develop a program hopefully to reduce corrosion of the stressmeters while in place at the Spent Fuel Facility. These laboratory tests are discussed along with the installation of the stressmeters at the Spent Fuel Facility.
Date:
May 20, 1980
Creator:
Abey, A. E. & Washington, H. R.
Object Type:
Report
System:
The UNT Digital Library
Education Vouchers: Constitutional Issues and Cases
This report details the constitutional standards that currently apply to indirect school aid programs and summarizes all of the pertinent Supreme Court decisions, with particular attention to Zelman. It also summarizes the pending case of Davey v. Locke and other recent and ongoing state and lower federal court cases concerning vouchers.
Date:
May 20, 2003
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
U.S. Security Assistance to Lebanon
This report discusses the variety of current U.S. security assistance programs to Lebanon including objectives, vetting processes, end-use monitoring, and issues for Congress. The last section of this report discusses the upcoming elections and the future of U.S. security assistance to Lebanon.
Date:
May 20, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
This report examines the economic partnership between the United States and the European Union. Not only is the U.S.-EU trade and investment relationship the largest in the world, but it is also arguably the most important. Agreement between the two partners in the past has been critical to making the world trading system more open and efficient.
Date:
May 20, 2005
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Performing Neutron Cross-Section Measurements at RIA
The Rare Isotope Accelerator (RIA) is a proposed accelerator for the low energy nuclear physics community. Its goal is to understand the natural abundances of the elements heavier than iron, explore the nuclear force in systems far from stability, and study symmetry violation and fundamental physics in nuclei. To achieve these scientific goals, RIA promises to produce isotopes far from stability in sufficient quantities to allow experiments. It would also produce near stability isotopes at never before seen production rates, as much as 10{sup 12} pps. Included in these isotopes are many that are important to stockpile stewardship, such as {sup 87}Y, {sup 146-50}Eu, and {sup 231}Th. Given the expected production rates at RIA and a reasonably intense neutron source, one can expect to make {approx} 10 {micro}g targets of nuclei with a half-life of {approx}1 day. Thus, it will be possible at RIA to obtain experimental information on the neutron cross section for isotopes that have to date only been determined by theory. There are two methods to perform neutron cross-section measurements, prompt and delayed. The prompt method tries to measure each reaction as it happens. The exact technique employed will depend on the reaction of interest, (n,2n), (n,{gamma}), …
Date:
May 20, 2003
Creator:
Ahle, L. E.
Object Type:
Report
System:
The UNT Digital Library
A Neutron Source Facility for Neutron Cross-Section Measurements on Radioactive Targets at RIA
The stockpile stewardship program is interested in neutron cross-section measurements on nuclei that are a few nucleons away from stability. Since neutron targets do not exist, radioactive targets are the only way to directly perform these measurements. This requires a facility that can provide high production rates for these short-lived nuclei as well as a source of neutrons. The Rare Isotope Accelerator (RIA) promises theses high production rates. Thus, adding a co-located neutron source facility to the RIA project baseline would allow these neutron cross-section measurements to be made. A conceptual design for such a neutron source has been developed, which would use two accelerators, a Dynamitron and a linac, to create the neutrons through a variety of reactions (d-d, d-t, deuteron break-up, p-Li). This range of reactions is needed in order to provide the desired energy range from 10's of keV to 20 MeV. The facility would also have hot cells to perform chemistry on the radioactive material both before and after neutron irradiation. The present status of this design and direction of future work will be discussed.
Date:
May 20, 2003
Creator:
Ahle, L. E.; Bernstein, L.; Rusnak, B. & Berio, R.
Object Type:
Article
System:
The UNT Digital Library
Thermal Analysis of SRF Cavity Couplers Using Parallel Multi physics Tool TEM3P
SLAC has developed a multi-physics simulation code TEM3P for simulating integrated effects of electromagnetic, thermal and structural loads. TEM3P shares the same software infrastructure with SLAC's parallel finite element electromagnetic codes, thus enabling all physics simulations within a single framework. The finite-element approach allows high-fidelity, high-accuracy simulations and the parallel implementation facilitates large-scale computation with fast turnaround times. In this paper, TEM3P is used to analyze thermal loading at coupler end of the JLAB SRF cavity.
Date:
May 20, 2009
Creator:
Akcelik, V; Lee, L. Q.; Li, Z.; Ng, C. K.; Ko, K.; Cheng, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Letter to Mr. Frank Rom, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio
None
Date:
May 20, 1965
Creator:
Albaugh, F. W.
Object Type:
Report
System:
The UNT Digital Library
Trip report to General Dynamics, Fort Worth, Texas
None
Date:
May 20, 1971
Creator:
Albertin, L.
Object Type:
Report
System:
The UNT Digital Library
Average Years of Service for Members of the Senate and House of Representatives, First - 110th Congresses
The average tenure of Members of the Senate and House of Representatives at the beginning of each Congress has varied substantially since 1789. The purpose of this report is to provide a Congress-by-Congress summary of the average years of service for Senators and Representatives for the First through the 110th Congresses.
Date:
May 20, 2008
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
House and Senate Chaplains
The official clergy of Congress are the two chaplains — one in the House, the other in the Senate. They are among the elected officers of their respective houses. At the beginning of each Congress, the House chaplain is elected for a two-year term. The Senate chaplain does not have to be reelected at the beginning of a new Congress. This fact sheet is one of a series on the legislative process. For more information on the legislative process.
Date:
May 20, 2005
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Extreme ultraviolet lithography: A few more pieces of the puzzle
The work described in this dissertation has improved three essential components of extreme ultraviolet (EUV) lithography: exposure tools, photoresist, and metrology. Exposure tools. A field-averaging illumination stage is presented that enables nonuniform, high-coherence sources to be used in applications where highly uniform illumination is required. In an EUV implementation, it is shown that the illuminator achieves a 6.5% peak-to-valley intensity variation across the entire design field of view. In addition, a design for a stand-alone EUV printing tool capable of delivering 15 nm half-pitch sinusoidal fringes with available sources, gratings and nano-positioning stages is presented. It is shown that the proposed design delivers a near zero line-edge-rougness (LER) aerial image, something extremely attractive for the application of resist testing. Photoresist. Two new methods of quantifying the deprotection blur of EUV photoresists are described and experimentally demonstrated. The deprotection blur, LER, and sensitivity parameters of several EUV photoresists are quantified simultaneously as base weight percent, photoacid generator (PAG) weight percent, and post-exposure bake (PEB) temperature are varied. Two surprising results are found: (1) changing base weight percent does not significantly affect the deprotection blur of EUV photoresist, and (2) increasing PAG weight percent can simultaneously reduce LER and E-size in EUV …
Date:
May 20, 2009
Creator:
Anderson, Christopher N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Hame Fastener.
Patent for a new and improved hame fastener. This design consists, "with the bar provided with a rack and longitudinal ways, of the housing provided at each end with downwardly and inwardly projecting lugs engaging said ways, and a spring provided with a stop, the link seated in a groove on the housing provided with a finger-hold, and an offset on said link adapted to strike against a projection on the spring for limiting the movement of said link" (lines 64-73).
Date:
May 20, 1890
Creator:
Anderson, Lee
Object Type:
Patent
System:
The Portal to Texas History
Top Prop.
Patent for a new and improved top-props for carriages. This design consists "[i]n combination with an arm having perforations and slot, plate provided with arm, pin, and bolt, and arms . . . secured, respectively, to the arm and the carriage-top" (lines 76-80).
Date:
May 20, 1890
Creator:
Anderson, Lee
Object Type:
Patent
System:
The Portal to Texas History
U.S. Foreign Assistance to Sub-Saharan Africa: The FY2012 Request
Sub-Saharan Africa, the world's poorest region, receives over a quarter of all U.S. bilateral foreign assistance. Aid to Africa more than quadrupled over the past decade, primarily due to sizable increases in global health spending during the Bush Administration and more measured increases in development, economic, and security assistance. The Obama Administration's FY2012 bilateral Africa aid budget request, at $7.8 billion, represents an increase of roughly 10% compared to FY2010, albeit at a more restrained growth rate than in previous years (see "The FY2012 Request by the Numbers"). FY2011 enacted levels are not yet available by region. The proposed increases are concentrated in the areas of health, governance, and agriculture.
Date:
May 20, 2011
Creator:
Arieff, Alexis; Cook, Nicolas; Salaam-Blyther, Tiaji; Kendall, Alexandra E.; Tarnoff, Curt & Ho, Melissa D.
Object Type:
Report
System:
The UNT Digital Library
The LSST camera corner raft conceptual design: a front-end for guiding and wavefront sensing
None
Date:
May 20, 2010
Creator:
Arndt, K.; Riot, V.; Alagoz, E.; Biccum, A.; Bohn, A.; Clampit, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Spring Wheel.
Patent for new and useful improvements in spring wheels sufficient to enable it to successfully stand up under the shocks and jars to which such wheels are ordinarily subjected, while at the same time having all the wearing qualities and resiliency of the pneumatic tire.
Date:
May 20, 1920
Creator:
Atkinson, George C.
Object Type:
Patent
System:
The Portal to Texas History
Eliminating a Major Cause of Wire Drawing Breakage in A-15 High-Field Superconductors
Eliminating a Major Cause of Wire Drawing Breakage in A-15 High-Field Superconductors Phase 1 Summary Purpose of the research: The Phase 1 goal was to make a significant improvement in the wire drawing technology used for difficult to draw superconductor precursor composites. Many ductile Nb-Al and Nb-Sn precursor wire composites have experienced the onset of wire drawing breakage at about 1.5 mm diameter. Phase 1 focused on evaluating the role that precision rigid guidance of the wire into the drawing die and the hydrostatic stress state at the die entrance played in preventing wire breakage. Research carried out: The research performed depended upon the construction of both a mechanical wire guide and a hydrostatic pressure stiffened wire guidance system. Innovare constructed the two wire guidance systems and tested them for their ability to reduce wire drawing breakage. One set of hardware provided rigid alignment of the wires to their wire drawing die axes within 0.35 degrees using ''hydrostatic pressure stiffening'' to enable the precision guidance strategy to be implemented for these highly flexible small diameter wires. This apparatus was compared to a guide arrangement that used short span mechanical guide alignment with a misalignment limit of about 0.75 degrees. Four …
Date:
May 20, 2003
Creator:
Austen, Alfred R.
Object Type:
Report
System:
The UNT Digital Library
Non-Classical Smoothening of Nano-Scale Surface Corrugations
We report the first experimental observation of non-classical morphological equilibration of a corrugated crystalline surface. Periodic rippled structures with wavelengths of 290-550 nm were made on Si(OO1) by sputter rippling and then annealed at 650 - 750 °C. In contrast to the classical exponential decay with time, the ripple amplitude, A<sub>{lambda}</sub>(t), followed an inverse linear decay, A<sub>{lambda}</sub>(t)= A<sub>{lambda}</sub>(0)/(1 +k<sub>{lambda}</sub>t), agreeing with a prediction of Ozdemir and Zangwill. We measure the activation energy for surface relaxation to be 1.6±0.2 eV, consistent with an interpretation that dimers mediate transport.
Date:
May 20, 1999
Creator:
Aziz, Michael J.; Chason, Eric; Erlebacher, Jonah; Floro, Jerrold A. & Sinclair, Michael B.
Object Type:
Article
System:
The UNT Digital Library
500 CFM portable exhauster temperature and humidity analysis
500 cfm portable exhausters will be utilized on single shell tanks involved in saltwell pumping. This will be done, in part, to remove flammable gases from the tank vapor space. The exhaust filter train, fan, stack, and associated instrumentation and equipment are mounted on a portable skid. The design analysis and basis for the skid system design are documented in reference 1. A pumped drainage collection system is being added to the existing portable exhausters. Additional equipment and instrumentation are also being added to the exhausters, including a vacuum pump cabinet and a generic effluent monitoring system (GEMS). The GEMS will provide sampling and monitoring capabilities. The purpose of this analysis is three fold. First, to determine the maximum saltwell tank vapor space temperature. Second, to determine an allowable exhauster inlet air temperature increase to ensure the humidity is less than 70%. Third, to assess potential adverse temperature effects to the continuous air monitor (CAM) sample head. The results of this analysis will be used to ensure that air stream temperatures in the portable exhausters are increased sufficiently to prevent condensation from forming on either the pre or HEPA filters without adversely effecting the CAM.
Date:
May 20, 1999
Creator:
BIELICKI, B.E.
Object Type:
Report
System:
The UNT Digital Library
Project management plan for low-level mixed waste and greater-than-category 3 waste per tri-party agreement M-91-10
The objective of this project management plan is to define the tasks and deliverables that will support the treatment, storage, and disposal of remote-handled and large container contact-handled low-level mixed waste, and the storage of Greater-thaw category 3 waste. The plan is submitted to fulfill the requirements of the Hanford Federal Facility Agreement and Consent Order Milestone M-91-10, The plan was developed in four steps: (1) the volumes of the applicable waste streams and the physical, dangerous, and radioactive characteristics were established using existing databases and forecasts; (2) required treatment was identified for each waste stream based on land disposal restriction treatment standards and waste characterization data; (3) alternatives for providing the required treatment were evaluated and the preferred options were selected; (4) an acquisition plan was developed to establish the technical, schedule, and cost baselines for providing the required treatment capabilities. The major waste streams are tabulated, along with the required treatment for disposal.
Date:
May 20, 1999
Creator:
BOUNINI, L.
Object Type:
Report
System:
The UNT Digital Library
Performance Technolgies for Peta-Scale Systems: A White Paper Prepared by the Performance Evaluation Research Center
Future-looking high end computing initiatives will deploy powerful, large-scale computing platforms that leverage novel component technologies for superior node performance in advanced system architectures with tens or even hundreds of thousands of nodes. Recent advances in performance tools and modeling methodologies suggest that it is feasible to acquire such systems intelligently and achieve excellent performance, while also significantly reducing the user time required to attain high performance. These developments are relevant to several aspects of future HEC technology outlined in the recent HECRTF white paper request, in particular items 5.4, 5.5, 5.6, and 5.8. We envision the following specific capabilities: (1) Performance modeling tools, available to researchers and vendors, will extrapolate performance from prototype systems to full-scale systems, and even accurately predict performance behavior before systems are manufactured, thus enabling both improved designs and more intelligent selection of systems in procurements. (2) System simulation facilities, implemented on highly parallel platforms and available to researchers and vendors, will for instance realistically model the performance of a specific interprocessor network design running a specific scientific application code. As with item 1, these facilities can lead both to improved designs and procurement decisions that yield significantly greater sustained performance for targeted scientific applications. …
Date:
May 20, 2003
Creator:
Bailey, D. H.; de Supinski, B. R.; Dongarra, J.; Dunigan, T.; Gao, G.; Hoisie, A. et al.
Object Type:
Report
System:
The UNT Digital Library