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open access

Plum Island Animal Disease Center: DHS Has Made Significant Progress Implementing Security Recommendations, but Several Recommendations Remain Open

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "For many years, the Department of Agriculture (USDA) owned and operated the Plum Island Animal Disease Center, located on an island in the Long Island Sound off the coast of New York. Scientists at Plum Island, often with the assistance of scientists from other countries, diagnose the pathogens that cause foreign animal diseases and then conduct research to, among other things, develop vaccines to protec… more
Date: December 17, 2007
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

A Call For Stewardship: Enhancing the Federal Government's Ability to Address Key Fiscal and Other 21st Century Challenges

Description: Other written product issued by the Government Accountability Office with an abstract that begins "Since the founding of the republic and the ratification of the Constitution, the U.S. government has evolved to reflect changing circumstances at home and abroad. At the end of George Washington's presidency in 1797, there were four cabinet-level departments--most run by small staffs of civil servants--and five cabinet-level officials, including the Attorney General. Today, there are nearly 30 maj… more
Date: December 17, 2007
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Operation of a Free-Electron Laser from the Extreme Ultraviolet to the Water Window

Description: We report results on the performance of a free-electron laser operating at a wavelength of 13.7 nm where unprecedented peak and average powers for a coherent extreme-ultraviolet radiation source have been measured. In the saturation regime, the peak energy approached 170 {micro}J for individual pulses, and the average energy per pulse reached 70 {micro}J. The pulse duration was in the region of 10 fs, and peak powers of 10 GW were achieved. At a pulse repetition frequency of 700 pulses per seco… more
Date: December 17, 2007
Creator: Ackermann, W.; Asova, G.; Ayvazyan, V.; Azima, A.; Baboi, N.; Bahr, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SOFTWARE QUALITY ASSURANCE FOR EMERGENCY RESPONSE CONSEQUENCE ASSESSMENT MODELS AT DOE'S SAVANNAH RIVER SITE

Description: The Savannah River National Laboratory's (SRNL) Atmospheric Technologies Group develops, maintains, and operates computer-based software applications for use in emergency response consequence assessment at DOE's Savannah River Site. These applications range from straightforward, stand-alone Gaussian dispersion models run with simple meteorological input to complex computational software systems with supporting scripts that simulate highly dynamic atmospheric processes. A software quality assura… more
Date: December 17, 2007
Creator: Hunter, C
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stable SUSY breaking model with O(10) eV gravitino from combined D-term gauge mediation and U(1)' mediation

Description: We show a calculable example of stable supersymmetry (SUSY) breaking modelswith O(10) eV gravitino mass based on the combination of D-term gauge mediationand U(1)' mediation. A potential problem of the negative mass squared for theSUSY standard model (SSM) sfermions in the D-term gauge mediation is solvedby the contribution from the U(1)' mediation. On the other hand, the splittingbetween the SSM gauginos and sfermions in the U(1)' mediation iscircumvented bythe contributions from t… more
Date: December 17, 2007
Creator: Nakayama, Yu & Nakayama, Yu
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magnetic Measurements and Simulations for a 4-magnet Dipole Chicane for the International Linear Collider

Description: T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. We describe magnetic measurements and simulations for the 4-magnet chicane used in T-474.
Date: December 17, 2007
Creator: Schreiber, H. J.; Viti, M.; /DESY; Duginov, V. N.; Kostromin, S. A.; Morozov, N. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A celestial gamma-ray foreground due to the albedo of small solar system bodies and a remote probe of the interstellar cosmic ray spectrum

Description: We calculate the {gamma}-ray albedo flux from cosmic-ray (CR) interactions with the solid rock and ice in Main Belt asteroids and Kuiper Belt objects (KBOs) using the Moon as a template. We show that the {gamma}-ray albedo for the Main Belt and Kuiper Belt strongly depends on the small-body mass spectrum of each system and may be detectable by the forthcoming Gamma Ray Large Area Space Telescope (GLAST). The orbits of the Main Belt asteroids and KBOs are distributed near the ecliptic, which pas… more
Date: December 17, 2007
Creator: Moskalenko, Igor V.; Porter, Troy A.; Digel, Seth W.; Michelson, Peter F. & Ormes, Jonathan F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A stable finite difference method for the elastic wave equation on complex geometries with free surfaces

Description: The isotropic elastic wave equation governs the propagation of seismic waves caused by earthquakes and other seismic events. It also governs the propagation of waves in solid material structures and devices, such as gas pipes, wave guides, railroad rails and disc brakes. In the vast majority of wave propagation problems arising in seismology and solid mechanics there are free surfaces. These free surfaces have, in general, complicated shapes and are rarely flat. Another feature, characterizing … more
Date: December 17, 2007
Creator: Appelo, D & Petersson, N A
Item Type: Refine your search to only Article
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: December 17, 2007
Creator: Offner, S R; Krumholz, M R; Klein, R I & McKee, C F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site

Description: The sorption behavior of americium (Am), plutonium (Pu), neptunium (Np), and uranium (U) in perched Rainier Mesa tunnel water was investigated. Both volcanic zeolitized tuff samples and groundwater samples were collected from Rainier Mesa, Nevada Test Site, NV for a series of batch sorption experiments. Sorption in groundwater with and without the presence of dissolved organic matter (DOM) was investigated. Am(III) and Pu(IV) are more soluble in groundwater that has high concentrations of DOM. … more
Date: December 17, 2007
Creator: Zhao, P.; Zavarin, M.; Leif, R.; Powell, B.; Singleton, M.; Lindvall, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Engineered and Administrative Safety Systems for the Control of Prompt Radiation Hazards at Accelerator Facilities

Description: The ANSI N43.1 Standard, currently in revision (ANSI 2007), sets forth the requirements for accelerator facilities to provide adequate protection for the workers, the public and the environment from the hazards of ionizing radiation produced during and from accelerator operations. The Standard also recommends good practices that, when followed, provide a level of radiation protection consistent with those established for the accelerator communities. The N43.1 Standard is suitable for all accele… more
Date: December 17, 2007
Creator: Liu, James C.; Vylet, Vashek & Walker, Lawrence S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Slant Path Distances Through Cells in Cylindrical Geometry and an Application to the Computation of Isophotes

Description: In computer programs involving two-dimensional cylindrical geometry, it is often necessary to calculate the slant path distance in a given direction from a point to the boundary of a mesh cell. A subroutine, HOWFAR, has been written that accomplishes this, and is very economical in computer time. An example of its use is given in constructing the isophotes for a low altitude nuclear fireball.
Date: December 17, 2007
Creator: Symbalisty, Rodney Whitaker Eugene
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SEADS 3.0 Sectoral Energy/Employment Analysis and Data System

Description: SEADS 3.0, the Sectoral Energy/Employment Analysis and Data System, is a revision and upgrading of SEADS–PC, a software package designed for the analysis of policy that could be described by modifying final demands of consumer, businesses, or governments (Roop, et al., 1995). If a question can be formulated so that implications can be translated into changes in final demands for goods and services, then SEADS 3.0 provides a quick and easy tool to assess preliminary impacts. And SEADS 3.0 should… more
Date: December 17, 2007
Creator: Roop, Joseph M.; Anderson, David A.; Schultz, Robert W. & Elliott, Douglas B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Elimination or Minimization of Oscillation Marks: A Path To Improved Cast Surface Quality

Description: Oscillation marks are the most recognizable feature of continuous casting and can be related to the subsurface defects that can be found on product rolled from continuous cast slabs. The purpose of this work was to develop strategies that can be used on industrial continuous casters to reduce oscillation mark depth and, in particular, to minimize the formation of hook type defects that are prevalent on ultra low carbon grades. The major focus of the work was on developing a technique to allow h… more
Date: December 17, 2007
Creator: Cramb, Alan W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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