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Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site
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. The sorption K{sub d} for Am(III) and Pu(IV) on volcanic zeolitized tuff was up to two orders of magnitude lower in samples with high DOM (15 to 19 mg C/L) compared to samples with DOM removed (< 0.4 mg C/L) or samples with naturally low DOM (0.2 mg C/L). In contrast, Np(V) and U(VI) sorption to zeolitized tuff was much less affected by the presence of DOM. The Np(V) and U(VI) sorption Kds were low under all conditions. Importantly, the DOM was not found to significantly sorb to the zeolitized tuff during these experiment. The concentration of DOM in groundwater affects the transport behavior of actinides in the subsurface. The mobility of Am(III) and Pu(IV) is significantly higher in groundwater with elevated levels of DOM resulting …
Date:
December 17, 2007
Creator:
Zhao, P.; Zavarin, M.; Leif, R.; Powell, B.; Singleton, M.; Lindvall, R. et al.
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 109, No. 170, Ed. 1 Monday, December 17, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 17, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 87, No. 16, Ed. 1 Monday, December 17, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 17, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
A Call For Stewardship: Enhancing the Federal Government's Ability to Address Key Fiscal and Other 21st Century Challenges
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 major federal departments and agencies with cabinet-level officials in the executive branch, and the federal workforce, including military personnel, now totals in the millions. In 1797, U.S. government spending represented about 2 percent of the U.S. economy and now it represents over 20 percent. A quick look at the federal budget reveals how much we have expanded beyond the Constitution's framers' original thoughts and our modest beginnings. In the coming decades, however, our ability to sustain even the constitutionally enumerated responsibilities of the federal government will come under increasing pressure. Without meaningful act on, by 2040 our government could only have the resources to do little more than mail out Social Security checks and pay interest on the massive and growing national debt. This is obviously an unacceptable …
Date:
December 17, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
A celestial gamma-ray foreground due to the albedo of small solar system bodies and a remote probe of the interstellar cosmic ray spectrum
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 passes through the Galactic center and high Galactic latitudes. If detected, the {gamma}-ray emission by the Main Belt and Kuiper Belt has to be taken into account when analyzing weak {gamma}-ray sources close to the ecliptic, especially near the Galactic center and for signals at high Galactic latitudes, such as the extragalactic {gamma}-ray emission. Additionally, it can be used to probe the spectrum of CR nuclei at close-to-interstellar conditions, and the mass spectrum of small bodies in the Main Belt and Kuiper Belt. The asteroid albedo spectrum also exhibits a 511 keV line due to secondary positrons annihilating in the rock. This may be an important and previously unrecognized celestial foreground for the INTErnational Gamma-Ray Astrophysics Laboratory …
Date:
December 17, 2007
Creator:
Moskalenko, Igor V.; Porter, Troy A.; Digel, Seth W.; Michelson, Peter F. & Ormes, Jonathan F.
Object Type:
Article
System:
The UNT Digital Library
Elimination or Minimization of Oscillation Marks: A Path To Improved Cast Surface Quality
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 heat transfer in the meniscus region of the continuous caster to be measured and the effect of mold slag chemistry and chrystallization to be documented. A new experimental technique was developed that allowed the effect of mold flux chemistry and chrystallization on the radiation heat transfer rate to be measured dynamically.
Date:
December 17, 2007
Creator:
Cramb, Alan W.
Object Type:
Report
System:
The UNT Digital Library
Engineered and Administrative Safety Systems for the Control of Prompt Radiation Hazards at Accelerator Facilities
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 accelerator facilities (using electron, positron, proton, or ion particle beams) capable of producing radiation, subject to federal or state regulations. The requirements (see word 'shall') and recommended practices (see word 'should') are prescribed in a graded approach that are commensurate with the complexity and hazard levels of the accelerator facility. Chapters 4, 5 and 6 of the N43.1 Standard address specially the Radiation Safety System (RSS), both engineered and administrative systems, to mitigate and control the prompt radiation hazards from accelerator operations. The RSS includes the Access Control System (ACS) and Radiation Control System (RCS). The main requirements and recommendations of the N43.1 Standard regarding the management, technical and operational aspects of the RSS are described and condensed in this report. Clearly some aspects of the RSS policies and practices …
Date:
December 17, 2007
Creator:
Liu, James C.; Vylet, Vashek & Walker, Lawrence S.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, December 17, 2007
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 17, 2007
Creator:
Wilson, Chris
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Research and Development Funding: Possible Impacts of Operating under a Continuing Resolution
None
Date:
December 17, 2007
Creator:
Shea, Dana A. & Morgan, Daniel
Object Type:
Report
System:
The UNT Digital Library
[Funeral Program for Ronald Edward Du Pree, December 17, 2007]
Funeral program for Mr. Ronald Edward Du Pree, born November 30, 1941 and died December 12, 2007. The funeral was held December 17, 2007 at Wheatley Heights First Baptist Church. The funeral arrangements were made through Lewis Funeral Home and he was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.
Date:
December 17, 2007
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
The Kinematics of Molecular Cloud Cores in the Presence of Driven and Decaying Turbulence: Comparisons with Observations
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 surrounding gas, and the motions of the cores relative to one another. Some of these distributions are significantly different in the driven and decaying runs, making them potential diagnostics for determining whether the turbulence in observed star-forming clouds is driven or decaying. Comparing our simulations with observed cores in the Perseus and {rho} Ophiuchus clouds shows reasonably good agreement between the observed and simulated core-to-core velocity dispersions for both the driven and decaying cases. However, we find that the linewidths through protostellar cores in both simulations are too large compared to the observations. The disagreement is noticeably worse for the decaying simulation, in which cores show highly supersonic in fall signatures in their centers that decrease toward their edges, a pattern not seen in the observed …
Date:
December 17, 2007
Creator:
Offner, S R; Krumholz, M R; Klein, R I & McKee, C F
Object Type:
Article
System:
The UNT Digital Library
Kosovo and U.S. Policy: Background and Current Issues
None
Date:
December 17, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
A Language for Specifying Compiler Optimizations for Generic Software
None
Date:
December 17, 2007
Creator:
Willcock, J J
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Long-Term Economic Growth: Sustainable Goals
None
Date:
December 17, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Magnetic Measurements and Simulations for a 4-magnet Dipole Chicane for the International Linear Collider
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.
Object Type:
Article
System:
The UNT Digital Library
Offender Reentry: Correctional Statistics, Reintegration into the Community, and Recidivism
None
Date:
December 17, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Operation of a Free-Electron Laser from the Extreme Ultraviolet to the Water Window
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 second, the average extreme-ultraviolet power reached 20mW. The output beam also contained a significant contribution from odd harmonics of approximately 0.6% and 0.03% for the 3rd (4.6 nm) and the 5th (2.75 nm) harmonics, respectively. At 2.75 nm the 5th harmonic of the radiation reaches deep into the water window, a wavelength range that is crucially important for the investigation of biological samples.
Date:
December 17, 2007
Creator:
Ackermann, W.; Asova, G.; Ayvazyan, V.; Azima, A.; Baboi, N.; Bahr, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Plum Island Animal Disease Center: DHS Has Made Significant Progress Implementing Security Recommendations, but Several Recommendations Remain Open
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 protect against them. Some of the pathogens maintained at Plum Island, such as foot-and-mouth disease, are highly contagious to livestock and could cause catastrophic economic losses in the agricultural sector if they are released outside the facility. Other pathogens known to have been maintained at Plum Island could also cause illness and death in humans. For these reasons, USDA conducts its work on Plum Island within a sealed biocontainment area that has special safety features designed to contain the pathogens. After the terrorist attacks on the United States, new laws and regulations required officials at the Plum Island Animal Disease Center to further restrict access to the pathogens in order to protect animal health and, thereby, also help reduce the possibility of bioterrorism. In …
Date:
December 17, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 93, No. 32, Ed. 1 Monday, December 17, 2007
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 17, 2007
Creator:
Mattox, Jami
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
SEADS 3.0 Sectoral Energy/Employment Analysis and Data System
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 be considered just that: a quick and easy way to get preliminary results. Often a thorough answer, even to such a simple question as, “What would be the effect on U. S. energy use and employment if the Federal Government doubled R&D expenditures?” requires a more sophisticated analytical framework than the input-output structure embedded in SEADS 3.0. This tool uses a static, input-output model to assess the impacts of changes in final demands on first industry output, then employment and energy use. The employment and energy impacts are derived by multiplying the industry outputs (derived from the changed final demands) by industry-specific energy and employment coefficients. The tool also allows for the specification of regional or state employment impacts, though …
Date:
December 17, 2007
Creator:
Roop, Joseph M.; Anderson, David A.; Schultz, Robert W. & Elliott, Douglas B.
Object Type:
Report
System:
The UNT Digital Library
Slant Path Distances Through Cells in Cylindrical Geometry and an Application to the Computation of Isophotes
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
Object Type:
Report
System:
The UNT Digital Library
SOFTWARE QUALITY ASSURANCE FOR EMERGENCY RESPONSE CONSEQUENCE ASSESSMENT MODELS AT DOE'S SAVANNAH RIVER SITE
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 assurance program has been developed to ensure appropriate lifecycle management of these software applications. This program was designed to meet fully the overall structure and intent of SRNL's institutional software QA programs, yet remain sufficiently practical to achieve the necessary level of control in a cost-effective manner. A general overview of this program is described.
Date:
December 17, 2007
Creator:
Hunter, C
Object Type:
Article
System:
The UNT Digital Library
A stable finite difference method for the elastic wave equation on complex geometries with free surfaces
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 problems arising in these areas, is the strong heterogeneity of the media, in which the problems are posed. For example, on the characteristic length scales of seismological problems, the geological structures of the earth can be considered piecewise constant, leading to models where the values of the elastic properties are also piecewise constant. Large spatial contrasts are also found in solid mechanics devices composed of different materials welded together. The presence of curved free surfaces, together with the typical strong material heterogeneity, makes the design of stable, efficient and accurate numerical methods for the elastic wave equation challenging. Today, many different classes of numerical methods are used for the simulation of elastic waves. Early on, most of the methods were based on finite difference approximations …
Date:
December 17, 2007
Creator:
Appelo, D & Petersson, N A
Object Type:
Article
System:
The UNT Digital Library
Stable SUSY breaking model with O(10) eV gravitino from combined D-term gauge mediation and U(1)' mediation
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 the D-term gauge mediation. Since the U(1)' mediation doesnot introduce any new SUSY vacua, we achieve a completely stable model underthermal effects. Our model, therefore, has no cosmological difficulty.
Date:
December 17, 2007
Creator:
Nakayama, Yu & Nakayama, Yu
Object Type:
Article
System:
The UNT Digital Library