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Preliminary Benchmarking Efforts and MCNP Simulation Results for Homeland Security

Description: It is shown in this work that basic measurements made from well defined source detector configurations can be readily converted in to benchmark quality results by which Monte Carlo N-Particle (MCNP) input stacks can be validated. Specifically, a recent measurement made in support of national security at the Nevada Test Site (NTS) is described with sufficient detail to be submitted to the American Nuclear Society’s (ANS) Joint Benchmark Committee (JBC) for consideration as a radiation measuremen… more
Date: April 18, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Study of B Meson Decays with Excited eta and eta-prime Mesons

Description: Using 383 million B{bar B} pairs from the BABAR data sample, they report results for branching fractions of six charged B-meson decay modes, where a charged kaon recoils against a charmless resonance decaying to K{bar K}* or {eta}{pi}{pi} final states with mass in the range (1.2-1.8) GeV/c{sup 2}. They observe a significant enhancement at the low K{bar K}* invariant mass which is interpreted as B{sup +} {yields} {eta}(1475)K{sup +}, find evidence for the decay B{sup +} {yields} {eta}(1295)K{sup… more
Date: April 18, 2008
Creator: Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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IMPACT OF SB4 TANK 40 DECANT AND ARP/MCU ADDITIONS WITH/WITHOUT ADDED CAUSTIC ON DWPF CPC PERFORMANCE

Description: The Savannah River National Laboratory (SRNL) was requested to investigate the impact of decanting supernate from the Sludge Batch four (SB4) feed in Tank 40. The specific questions concerned the potential impact on the stoichiometric acid window determined for SB4 with respect to overall hydrogen generation rates, nitrite destruction in the Sludge Receipt and Adjustment Tank (SRAT) and the rheology of the sludge, SRAT product, and Slurry Mix Evaporator (SME) product slurries. The scope include… more
Date: April 18, 2008
Creator: Koopman, D; David Best, D & Frances Williams, F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Kinematics of Molecular Cloud Cores in the Presence of Driven and Decaying Turbulence: Comparisons with Observations

Description: In this study we investigate the formation and properties of prestellar and protostellar cores using hydrodynamic, self-gravitating Adaptive Mesh Refinement simulations, comparing the cases where turbulence is continually driven and where it is allowed to decay. We model observations of these cores in the C{sup 18}O(2 {yields} 1), NH{sub 3}(1,1), and N{sub 2}H{sup +} (1 {yields} 0) lines, and from the simulated observations we measure the linewidths of individual cores, the linewidths of the su… more
Date: April 18, 2008
Creator: Offner, S R; Krumholz, M R; Klein, R I & McKee, C F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stewarding a Reduced Stockpile

Description: The future of the US nuclear arsenal continues to be guided by two distinct drivers: the preservation of world peace and the prevention of further proliferation through our extended deterrent umbrella. Timely implementation of US nuclear policy decisions depends, in part, on the current state of stockpile weapons, their delivery systems, and the supporting infrastructure within the Department of Defense (DoD) and the Department of Energy's National Nuclear Security Administration (NNSA). In tur… more
Date: April 18, 2008
Creator: Goodwin, B. T. & Mara, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Can Handheld Plastic Detectors Do Both Gamma and Neutron Isotopic Identification with Directional Source Location?

Description: This paper demonstrates, through MCNPX simulations, that a compact hexagonal array of detectors can be utilized to do both gamma isotopic identification (ID) along with neutron identification while simultaneously finding the direction of the source relative to the detector array. The detector array itself is composed of seven borated polyvinyl toluene (PVT) hexagonal light pipes approximately 4 inches long and with a 1.25 inch face-to-face thickness assembled in a tight configuration. The gamma… more
Date: April 18, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Enlargement Issues at NATO's Bucharest Summit

Description: This report reviews the process by which candidate states are selected, including a sketch of the responsibilities of Congress and allied governments in final approval or disapproval of Albania and Croatia. The report reviews general political factors for qualification, as well as external issues such as the views of Russia and regional geopolitical considerations. Then follows an analysis of current conditions in the two states nominated to join, as well as in Macedonia. In addition, there is … more
Date: April 18, 2008
Creator: Gallis, Paul; Belkin, Paul; Ek, Carl; Kim, Julie; Nichol, Jim & Woehrel, Steven
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Government Interventions in Financial Markets: Economic and Historic Analysis of Subprime Mortgage Options

Description: This report summarizes and analyzes four previous government market interventions (Home Owners Loan Corporation in 1933, Continental Illinois in 1984, the savings and loan insurance fund shortfall in 1989, and the Latin American debt crisis in 1989), in light of current mortgage market conditions. Current proposals to help delinquent homeowners share many features in common with all of these actions.
Date: April 18, 2008
Creator: Weiss, N. Eric
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Weak and Failing States: Evolving Security Threats and U.S. Policy

Description: This report first provides definitions of weak states and describes the links between weak states, U.S. national security, and development challenges. Second, the report surveys recent key U.S. programs and initiatives designed to address threats emanating from weak states. Finally, it highlights relevant issues about U.S. policy toward these states that Congress may consider.
Date: April 18, 2008
Creator: Wyler, Liana Sun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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