A letter report issued by the Government Accountability Office with an abstract that begins "Intercity passenger rail service is at a critical juncture in the United States. Amtrak, the current service provider, requires $1 billion a year in federal subsidies to stay financially viable but cannot keep pace with its deteriorating infrastructure. At the same time, the federal government faces growing fiscal challenges. To assist the Congress, GAO reviewed (1) the existing U.S. system and its potential benefits, (2) how foreign countries have handled passenger rail reform and how well the United States is positioned to consider reform, (3) challenges inherent in attempting reform efforts, and (4) potential options for the federal role in intercity passenger rail. GAO analyzed data on intercity passenger rail performance and studied reform efforts in Canada, France, Germany, Japan, and the United Kingdom."

Correspondence issued by the Government Accountability Office with an abstract that begins "In light of the September 2001 terror attacks, we were asked to examine the Department of Commerce's Bureau of Industry and Security's (BIS) dual-use export control system. We reported our findings in a June 26, 2006, report, saying that BIS has not systematically evaluated the overall effectiveness and efficiency of the dual-use export control system. Specifically, we reported that BIS has not conducted comprehensive analyses of available data about items that have actually been exported from the United States. We made several recommendations in that report, including that Commerce should use the available data to evaluate the system's effectiveness. Because we had difficulty obtaining data on actual exports from Commerce, we were unable to provide specific details about these data in time for our June 2006 report. We have since obtained the data and are now transmitting to Congress our analysis of the data for 2004 and 2005."

Correspondence issued by the Government Accountability Office with an abstract that begins "In hearings conducted between 1990 and 1994, Congress noted that violence against women was a problem of national scope and that the majority of crimes associated with domestic violence, sexual assault, and stalking were perpetrated against women. These hearings culminated in the enactment of the Violence Against Women Act (VAWA) in 1994 to address these issues on a national level. VAWA established grant programs within the Departments of Justice (DOJ) and Health and Human Services (HHS) for state, local, and Indian tribal governments and communities. These grants have various purposes, such as providing services to victims and training for law enforcement officers and prosecutors. The 2006 reauthorization of VAWA expanded existing grant programs and added new programs addressing, among other things, young victims, the housing and economic needs of victims, and the health care system's response to domestic violence, dating violence, sexual assault, and stalking. Although criminal justice, health, and domestic violence experts believe that valid and reliable estimates have the potential to be of use to policy makers, service providers, and researchers, there are concerns that current crime statistics do not provide a full assessment of the …

A letter report issued by the Government Accountability Office with an abstract that begins "In 2003, Congress created the Joint Planning and Development Office (JPDO) to plan for and coordinate, with federal and nonfederal stakeholders, a transformation from the current air traffic control system to the "next generation air transportation system" (NGATS) by 2025. Housed within the Federal Aviation Administration (FAA), JPDO has seven partner agencies: the Departments of Transportation, Commerce, Defense, and Homeland Security; FAA; the National Aeronautics and Space Administration (NASA); and the White House Office of Science and Technology Policy. FAA will have primary responsibility for implementing NGATS. This report addresses (1) the status of JPDO's efforts to plan for NGATS, (2) the key challenges facing JPDO, and (3) the key challenges facing FAA as it implements the transformation. To address these issues, GAO reviewed relevant documents, interviewed agency officials and stakeholders, and conducted an expert panel."

A letter report issued by the Government Accountability Office with an abstract that begins "Because of broad congressional interest, GAO is examining the costs of military operations in support of the Global War on Terrorism (GWOT) under the Comptroller General's authority to conduct evaluations on his own initiative. In September 2005, GAO reported the Department of Defense (DOD) cannot ensure reported GWOT obligations are complete, reliable, and accurate, and recommended improvements. In this report, GAO (1) compared supplemental and annual appropriations identified for GWOT in fiscal year 2006 to the military services' reported obligations as of June 2006 and their cost projections for the remainder of the fiscal year, and (2) examined DOD's efforts to improve the reliability of GWOT obligation data. For this engagement, GAO analyzed fiscal year 2006 GWOT related appropriations and reported obligations, and DOD's corrective actions."

A letter report issued by the Government Accountability Office with an abstract that begins "Medicare covers dialysis--a process that removes excess fluids and toxins from the bloodstream--for most individuals with end-stage renal disease (ESRD), a condition of permanent kidney failure. The Centers for Medicare & Medicaid Services (CMS) pays for certain dialysis services under a type of bundled rate, called a composite rate, and, for certain dialysis-related drugs, pays a separate rate per dose each time the drug is administered. These drugs are referred to as "separately billable" and are paid at 6 percent above manufacturers' average sales price (ASP). Recently, the Congress required CMS to explore the creation of a bundled payment for all ESRD services, including separately billable drugs. GAO was asked to examine (1) recent changes in payments for ESRD services, (2) the ASP payment method of setting rates for separately billable ESRD drugs, and (3) CMS efforts to develop a bundled payment method that includes all ESRD drugs. GAO obtained information for this study from CMS, the U.S. Renal Data System, ESRD experts, and previously issued GAO reports."

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This report discusses the special role that the dollar plays in international finance and the strength and stability of the U.S. financial markets (including Treasury securities) which make them attractive sources for foreign investment.

This report is on Balancing Scientific Publication and National Security Concerns: Issues for Congress.

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This report details the events as they unfolded, and includes the number of cases, the detention of the first case, and the process by which relevant agencies acted as subsequent cases were reported.

Monte Carlo calculations of the giant-dipole-resonance photoneutrons (GRN) around the Varian Clinac 2100C/2300C medical accelerator heads (10-20 MV modes) were made using the coupled EGS4-MORSE code. The actual head materials and geometries were simulated in great detail using the Combinatorial Geometry facility of MORSE. The neutron production (i.e., sites and yields) was calculated with EGS4 and, then, the neutron transport in the accelerator head was done with MORSE. Both the evaporation and direct neutron components of the GRN were considered by incorporating the EVAP4 code and an empirical algorithm, respectively, into MORSE. With the calculated neutron spectra around the head as source terms, MCNP4a was used to estimate the corresponding dose equivalent transmission (considering both the neutron attenuation and the build-up of captured gamma rays) in several different types of concrete. The calculated results of the absolute neutron fluence and spectra around the heads, as well as the transmission curves, are presented and discussed.

Spent nuclear fuel contains fissionable materials ({sup 235}U, {sup 239}Pu, {sup 241}Pu, etc.). Neutron multiplication and the potential for criticality are enhanced by the presence of a moderator during cask loading in water, water incursion in accidents conditions during spent fuel storage or transport. To prevent nuclear criticality in spent fuel storage, transportation, and during disposal, neutron-absorbing materials (or neutron poisons, such as borated stainless steel, Boral{trademark}, Metamic{trademark}, Ni-Gd, and others) would have to be applied. The success in demonstrating that the High-Performance Corrosion-Resistant material (HPCRM) can be thermally applied as coating onto base metal to provide for corrosion resistance for many naval applications raises the interest in applying the HPCRM to USDOE/OCRWM spent fuel management program. The fact that the HPCRM relies on the high content of boron to make the material amorphous--an essential property for corrosion resistance--and that the boron has to be homogeneously distributed in the HPCRM qualify the material to be a neutron poison.

The capsules used in ignition experiments on the National Ignition Facility (NIF) laser will have a layer of frozen DT inside a low-Z shell. Liquid DT will be injected through a narrow fill tube that penetrates the shell and frozen in place. The fill tube is a perturbation on the surface of the capsule and hydrodynamic instabilities will cause this perturbation to grow during an implosion. Experiments to investigate the growth of perturbations due to fill tubes have been carried out on the Omega laser. The goal of these experiments was to validate simulations at Omega energy scales and thus increase confidence in the use of simulations in planning for NIF experiments. Simulations show that the fill tube leads to a jet of shell material that penetrates into the DT fuel. Simulations will be used to pick experimental conditions in which the jet is small enough that it does not significantly reduce the yield of a NIF implosion. This paper compares experiments in which bumps and stalks were used as fill tube surrogates to 2D simulations of x-ray emission from Omega capsule implosions. Experiments and simulations are in reasonable agreement on the size of a bump or stalk required to …

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This treatability study was conducted by Pacific Northwest National Laboratory (PNNL), at the request of the U. S. Environmental Protection Agency (EPA) Region 2, to evaluate the feasibility of using in situ treatment technologies for chromate reduction and immobilization at the Puchack Well Field Superfund Site in Pennsauken Township, New Jersey. In addition to in situ reductive treatments, which included the evaluation of both abiotic and biotic reduction of Puchack aquifer sediments, natural attenuation mechanisms were evaluated (i.e., chromate adsorption and reduction). Chromate exhibited typical anionic adsorption behavior, with greater adsorption at lower pH, at lower chromate concentration, and at lower concentrations of other competing anions. In particular, sulfate (at 50 mg/L) suppressed chromate adsorption by up to 50%. Chromate adsorption was not influenced by inorganic colloids.

While Impact incorporates diagnostic radiation routines from our work in previous years, it has not previously included the stratospheric relaxation required for forcing calculations. We have now implemented the necessary changes for stratospheric relaxation, tested its stability, and compared the results with stratosphere temperatures obtained from CAM3 met data. The relaxation results in stable temperature profiles in the stratosphere, which is encouraging for use in forcing calculations. It does, however, produce a cooling bias when compared to CAM3, which appears to be due to differences in radiation calculations rather than the interactive treatment of ozone. The cause of this bias is unclear as yet, but seems to be systematic and hence cancels out when differences are taken relative to a control simulation.

This report collects information on cathode contaminants we have gathered in the process of operating the LBNL DARHT cathode test stand. Information on contaminants is compiled from several sources. The attachment, ''Practical Aspects of Modern Dispenser Cathodes'', is from Heat Wave Corp. (TB-134) and was originally published in Microwave Journal, September 1979. Cathode contamination depends on both material choices and residual gases. Table 1 of TB-134 lists materials that can poison dispenser cathodes. These include reactive residual gases or vapors such as oxygen, water vapor, benzene, chlorine, fluorine, sulfur, silicon, and most metals other than molybdenum, rhenium, tungsten, and copper. The metals interact with the cathode surface through their vapor pressure. A paper by Nexsen and Turner, J. Appl. Phys. 68, 298-303 (1990) shows the threshold effects of some common residual gases or vapors on cathode performance. The book by Walter H. Kohl, Handbook of Materials and Techniques for Vacuum Devices, also contains useful information on cathodes and poisoning agents. A plot of the vapor pressures and poisoning effect of certain metals (from Kohl) is shown below. Note that the vapor pressure of zinc is 1.1 x 10{sup -8} Torr at 400 K = 127 C, and 2.7 x 10{sup …

We describe the physics and codes developed in the Muon Physics Package. This package is a self-contained Fortran90 module that is intended to be used with the Monte Carlo package MCNPX. We calculate simulated energy spectra, multiplicities, and angular distributions of direct neutrons and pions from muon spallation.

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree

A doctoral recital performed at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.

We apply the no-core shell model to the nuclear structure of odd-mass nuclei straddling {sup 48}Ca. Starting with the NN interaction, that fits two-body scattering and bound state data, we evaluate the nuclear properties of A = 47 and A = 49 nuclei while preserving all the underlying symmetries. Due to model space limitations and the absence of three-body interactions, we incorporate phenomenological interaction terms determined by fits to A = 48 nuclei in a previous effort. Our modified Hamiltonian produces reasonable spectra for these odd-mass nuclei. In addition to the differences in single-particle basis states, the absence of a single-particle Hamiltonian in our no-core approach complicates comparisons with valence effective NN interactions. We focus on purely off-diagonal two-body matrix elements since they are not affected by ambiguities in the different roles for one-body potentials and we compare selected sets of fp-shell matrix elements of our initial and modified Hamiltonians in the harmonic oscillator basis with those of a recent model fp-shell interaction, the GXPF1 interaction of Honma et al. While some significant differences emerge from these comparisons, there is an overall reasonably good correlation between our off-diagonal matrix elements and those of GXPF1.

This report describes Iran's known nuclear sites listed in official International Atomic Energy Agency (IAEA) reports and includes a map with the location of the nuclear facilities. For further information and analysis of Iran's nuclear programs, see CRS Report RS21592, Iran's Nuclear Program: Recent Developments, by Sharon Squassoni; and CRS Report RL32048 Iran: U.S. Concerns and Policy Responses, by Kenneth Katzman.

In order to better understand EPA’s actions, this report provides an analysis of the agency’s final 2006 revisions to the particulates NAAQS, and the estimated costs and benefits of the new standards and of a more stringent alternatives analyzed. The report concludes by highlighting concerns and issues raised regarding the revisions to the particulates standards, including those of the science advisory committee (Clean Air Scientific Advisory Committee, or CASAC), and actions in Congress.