UNT Libraries Government Documents Department - 23 Matching Results

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Parallel Computation of Intergrated Electronmagnetic, Thermal and Structural Effects for Accelerator Cavities

Description: The successful operation of accelerator cavities has to satisfy both rf and mechanical requirements. It is highly desirable that electromagnetic, thermal and structural effects such as cavity wall heating and Lorentz force detuning in superconducting rf cavities can be addressed in an integrated analysis. Based on the SLAC parallel finite-element code infrastructure for electromagnetic modeling, a novel multi-physics analysis tool has been developed to include additional thermal and mechanical … more
Date: July 2, 2008
Creator: Akcelik, V.; Candel, A.; Kabel, A.; Lee, L. Q.; Li, Z.; Ng, C. K. et al.
Item Type: Refine your search to only Article
open access

Substructure of High-pT Jets at the LHC

Description: We study high-p{sub T} jets from QCD and from highly-boosted massive particles such as tops, W,Z and Higgs, and argue that infrared-safe observables can help reduce QCD backgrounds. Jets from QCD are characterized by different patterns of energy flow compared to the products of highly-boosted heavy particle decays, and we employ a variety of jet shapes, observables restricted to energy flow within a jet, to explore this difference. Results from Monte Carlo generators and arguments based on pert… more
Date: July 2, 2008
Creator: Almeida, L.G.; Lee, S.J.; Perez, G.; Sterman, G.; Sung, I. & Virzi, J.
Item Type: Refine your search to only Article
open access

The United States and Europe: Current Issues

Description: The United States and Europe share a long and intertwined history. Both sides of the Atlantic face a common set of international concerns, have few other comparable partners, and share a deep economic relationship. Despite much improvement in overall relations since the divisive debate over Iraq policy, several foreign policy and trade disputes remain. This report examines the current state of the transatlantic relationship and key issues that may have implications for U.S. interests in the sec… more
Date: July 2, 2008
Creator: Archick, Kristin
Item Type: Refine your search to only Report
open access

Polymer Growth Rate in a Wire Chamber with Oxygen,Water, or Alcohol Gas Additives

Description: The rate of polymer growth on wires was measured in a wire chamber while the chamber was aged initially with helium-isobutane (80:20) gas, and then with either oxygen, water, or alcohol added to the gas. At the completion of the aging process for each gas mixture, the carbon content on the wires was measured in a SEM/EDX instrument. The same physical wires were used in all the gas mixtures, allowing measurement of polymer build up or polymer depletion by each gas additive. It is found that the … more
Date: July 2, 2008
Creator: Boyarski, Adam
Item Type: Refine your search to only Article
open access

Enhanced Elemental Mercury Removal from Coal-fired Flue Gas by Sulfur-chlorine Compounds

Description: Oxidation of Hg0 with any oxidant or converting it to a particle-bound form can facilitate its removal. Two sulfur-chlorine compounds, sulfur dichloride (SCl2) and sulfur monochloride (S2Cl2), were investigated as oxidants for Hg0 by gas phase reaction and by surface-involved reactions in the presence of flyash or activated carbon. The gas phase reaction rate constants between Hg0 and the sulfur/chlorine compounds were determined, and the effects of temperature and the main components in flue g… more
Date: July 2, 2008
Creator: Chang, Shih-Ger; Yan, Nai-Qiang; Qu, Zan; Chi, Yao; Qiao, Shao-Hua; Dod, Ray et al.
Item Type: Refine your search to only Article
open access

Immigration: Terrorist Grounds for Exclusion and Removal of Aliens

Description: This report focuses on the terrorism-related grounds for inadmissibility and deportation/removal. It opens with an overview of the terror-related grounds as they evolved through key legislation enacted in recent years. The section on current law explains the legal definitions of "terrorist activity," "engage in terrorist activity," and "terrorist organization," and describes the terror-related grounds for inadmissibility and removal. The report then discusses the alien screening process to dete… more
Date: July 2, 2008
Creator: Garcia, Michael John & Wasem, Ruth Ellen
Item Type: Refine your search to only Report
open access

3-D Model of Broadband Emission from Supernova Remnants Undergoing Non-linear Diffusive Shock Acceleration

Description: We present a 3-dimensional model of supernova remnants (SNRs) where the hydrodynamical evolution of the remnant is modeled consistently with nonlinear diffusive shock acceleration occurring at the outer blast wave. The model includes particle escape and diffusion outside of the forward shock, and particle interactions with arbitrary distributions of external ambient material, such as molecular clouds. We include synchrotron emission and cooling, bremsstrahlung radiation, neutral pion production… more
Date: July 2, 2008
Creator: Lee, Shiu-Hang; Kamae, Tuneyoshi & Ellison, Donald C.
Item Type: Refine your search to only Article
open access

Update to the Ground-Water Withdrawals Database for the Death Valley REgional Ground-Water Flow System, Nevada and California, 1913-2003

Description: Ground-water withdrawal estimates from 1913 through 2003 for the Death Valley regional ground-water flow system are compiled in an electronic database to support a regional, three-dimensional, transient ground-water flow model. This database updates a previously published database that compiled estimates of ground-water withdrawals for 1913–1998. The same methodology is used to construct each database. Primary differences between the 2 databases are an additional 5 years of ground-water withdra… more
Date: July 2, 2008
Creator: Moreo, Michael T. & Justet, and Leigh
Item Type: Refine your search to only Report
open access

Navy Ford (CVN-78) Class Aircraft Carrier Program: Background and Issues for Congress

Description: The Navy's proposed FY2009 budget requested $2,712 million in procurement funding for CVN-78, the first ship in the Gerald R. Ford (CVN-78) class of aircraft carriers, which was earlier known as the CVN-21 class. Although CVN-78 was procured in FY2008, the Navy's budget includes procurement funding for the ship in FY2009, FY2010, and FY2011. The Navy's proposed FY2008 budget also requested $1,214 million in advance procurement funding for CVN-79, the second ship in the class, which the Navy wa… more
Date: July 2, 2008
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
open access

Evolution of the Senate's Role in the Nomination and Confirmation Process: A Brief History

Description: This report discusses the process of Advice and Consent in the Senate. Article II, Section 2 of the Constitution states that the President "shall nominate, and by and with the Advice and Consent of the Senate, shall appoint Ambassadors, other Public Ministers and Counsels, Judges of the Supreme Court, and all Other Officers of the United States, whose appointments are not herein otherwise provided for, and which shall be established by law…."
Date: July 2, 2008
Creator: Palmer, Betsy
Item Type: Refine your search to only Report
open access

Molecular Components of Catalytic Selectivity

Description: Selectivity, that is, to produce one molecule out of many other thermodynamically feasible product molecules, is the key concept to develop 'clean manufacturing' processes that do not produce byproducts (green chemistry). Small differences in potential energy barriers for elementary reaction steps control which reaction channel is more likely to yield the desired product molecule (selectivity), instead of the overall activation energy for the reaction that controls turnover rates (activity). Re… more
Date: July 2, 2008
Creator: Somorjai, Gabor A. & Park, Jeong Y.
Item Type: Refine your search to only Article
open access

Defense Acquisitions: A Knowledge-Based Funding Approach Could Improve Major Weapon System Program Outcomes

Description: A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) expects the cost to develop and procure the major weapon systems in its current portfolio to total $1.6 trillion. With increased competition for funding within DOD and across the federal government, effectively managing these acquisitions is critical. Yet DOD programs too often experience poor outcomes--like increased costs and delayed fielding of needed capabilities to t… more
Date: July 2, 2008
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

Internal Revenue Service: Status of GAO Financial Audit and Related Financial Management Report Recommendations

Description: A letter report issued by the Government Accountability Office with an abstract that begins "In its role as the nation's tax collector, the Internal Revenue Service (IRS) has a demanding responsibility in annually collecting trillions of dollars in taxes, processing hundreds of millions of tax and information returns, and enforcing the nation's tax laws. Since its first audit of IRS's financial statements in fiscal year 1992, GAO has identified a number of weaknesses in IRS's financial manageme… more
Date: July 2, 2008
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

Experimental Study of the Hall Effect and Electron Diffusion Region During Magnetic Reconnection in a Laboratory Plasma

Description: The Hall effect during magnetic reconnection without an external guide field has been extensively studied in the laboratory plasma of the Magnetic Reconnection Experiment (MRX) [Yamada et al., Phys. Plasmas 4, 1936 (1997)] by measuring its key signature, an out-of-plane quadrupole magnetic field, with magnetic probe arrays whose spatial resolution is on the order of the electron skin depth. The in-plane electron flow is deduced from out-of-plane magnetic field measurements. The measured in-plan… more
Date: July 2, 2008
Creator: Yang Ren, Masaaki Yamada, Hantao Ji, Seth Dorfman, Stefan Gerhardt, and Russel Kulsrud
Item Type: Refine your search to only Report
open access

Collimation Optimizations, Capture Efficiency, and Primary-Beam Power Loss in the ILC Positron Source

Description: The ILC positron beam generated from a thin Ti target has a wide energy spread and large transverse divergence. With the collection optics immediately downstream of the target and pre-acceleration to 125 MeV, the collected positron beam still has a long tail of positrons with low energies and large transverse divergence, which will be lost in the rest of the ILC positron source beamline. A collimation system is proposed and optimized for the case of a shielded target with quarter-wave transform… more
Date: July 2, 2008
Creator: Zhou, F.; /slac; Liu, W.; /Argonne; Nosochkov, Y.; Sheppard, J.C. et al.
Item Type: Refine your search to only Article
open access

Anisotropic x ray magnetic linear dichroism - Its importance for the analysis of soft x ray spectra of magnetic oxides

Description: Using spectroscopic information for x ray magnetometry and magnetic microscopy requires detailed theoretical understanding of spectral shape and magnitude of dichroism signals. We have shown unambiguously that--contrary to common belief--spectral shape and magnitude of x ray magnetic linear dichroism (XMLD) are not only determined by the relative orientation of magnetic moments and x ray polarization, but also their orientations relative to the crystallographic axes must be taken into account f… more
Date: July 2, 2008
Creator: van der Laan, G. & Arenholz, Elke
Item Type: Refine your search to only Article
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