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Specialty Hospitals: Information on National Market Share, Physician Ownership, and Patients Served (open access)

Specialty Hospitals: Information on National Market Share, Physician Ownership, and Patients Served

Correspondence issued by the General Accounting Office with an abstract that begins "Specialty hospitals represent a small but growing segment of the health care industry. These hospitals specialize in providing care for certain conditions, such as cardiac care, or performing certain procedures, such as orthopedic surgery. Specialty hospitals are not an entirely new phenomenon, as children's and other types of specialty hospitals have existed for decades. Consequently, it is challenging to distinguish between the old and new types of specialty hospitals. One aspect that sets apart the newer genre of specialty hospitals is that many are owned, in part, by the physicians who work in them. Advocates contend that, because of their focused mission, specialty hospitals can provide high-quality specialty services more efficiently than general hospitals. Because specialty hospitals can tailor their facilities and resources to best fit the needs of certain types of patients, individuals treated in such hospitals may enjoy relatively greater convenience and comfort. Specialty hospitals may also offer physicians financial and work environment advantages. Advocates have stated that the focused mission and dedicated resources of specialty hospitals allow physicians to treat more patients than they could in general hospitals. Physicians may gain financially from this increased …
Date: April 18, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
DOD Personnel: DOD Comments on GAO's Report on DOD's Civilian Human Capital Strategic Planning (open access)

DOD Personnel: DOD Comments on GAO's Report on DOD's Civilian Human Capital Strategic Planning

Correspondence issued by the General Accounting Office with an abstract that begins "In response to a Congressional request, we issued a report in March 2003 on the Department of Defense's (DOD) strategic planning efforts for civilian personnel at DOD and selected defense components, including the four military services and two defense agencies. In that report we made recommendations to the Secretary of Defense to strengthen civilian human capital planning, including integration with military personnel and sourcing initiatives. DOD's response to our March 2003 report and recommendations were received too late to be included in that report. To provide our perspective on DOD's comments, we briefly summarize our March 2003 report's objectives, results, and recommendations and DOD's comments, along with our evaluation of the comments. DOD's civilian employees play key roles in such areas as defense policy, intelligence, finance, acquisitions, and weapon systems maintenance. Although downsized 38 percent between fiscal years 1989 and 2002, this workforce has taken on greater roles as a result of DOD's restructuring and transformation. Responding to congressional concerns about the quality and quantity of, and the strategic planning for, the civilian workforce, we determined the following for DOD, the military services, and selected defense agencies (the …
Date: April 18, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Defense Space Activities: Organizational Changes Initiated, but Further Management Actions Needed (open access)

Defense Space Activities: Organizational Changes Initiated, but Further Management Actions Needed

A letter report issued by the General Accounting Office with an abstract that begins "In January 2001, the congressionally chartered Commission to Assess United States National Security Space Management and Organization--known as the Space Commission--reported that the Department of Defense (DOD) lacked the senior-level focus and accountability to provide guidance and oversight for national security space operations. Congress mandated that GAO provide an assessment of DOD's actions to implement the Space Commission's recommendations. Thus, GAO (1) updated its June 2002 assessment of DOD's actions to address the Space Commission's recommendations, (2) ascertained progress in addressing other long- term management concerns, and (3) assessed the extent to which DOD has developed a results-oriented management framework for space activities."
Date: April 18, 2003
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Elections: All Levels of Government Are Needed to Address Electronic Voting System Challenges (open access)

Elections: All Levels of Government Are Needed to Address Electronic Voting System Challenges

Testimony issued by the Government Accountability Office with an abstract that begins "Since the 2000 national elections, concerns have been raised by various groups regarding the election process, including voting technologies. Beginning in 2001, GAO published a series of reports examining virtually every aspect of the elections process. GAO's complement of reports was used by Congress in framing the Help America Vote Act of 2002, which, among other things, provided for replacement of older voting equipment with more modern electronic voting systems and established the Election Assistance Commission (EAC) to lead the nation's election reform efforts. GAO's later reports have raised concerns about the security and reliability of these electronic voting systems, examined the EAC's efforts to address these concerns, and surveyed state and local officials about practices used during the 2004 election, as well as plans for their systems for the 2006 election. Using its published work on electronic voting systems, GAO was asked to testify on (1) the contextual role and characteristics of electronic voting systems, (2) the range of security and reliability concerns that have been reported about these systems, (3) the experiences and management practices of states and local jurisdictions regarding these systems, and (4) the …
Date: April 18, 2007
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Aviation Fees: Review of Air Carriers' Year 2000 Passenger and Property Screening Costs (open access)

Aviation Fees: Review of Air Carriers' Year 2000 Passenger and Property Screening Costs

A letter report issued by the Government Accountability Office with an abstract that begins "The Aviation and Transportation Security Act (ATSA) authorized the Transportation Security Administration (TSA) to impose an Aviation Security Infrastructure Fee (ASIF) on air carriers to help pay for the costs of aviation security services. To impose the ASIF, TSA issued an Interim Final Rule (IFR) and required air carriers to report their passenger and property screening costs incurred in 2000 on an attachment to the IFR referred to as Appendix A. The 2000 screening costs reported by air carriers were going to be used to establish the ASIF. Based on industry estimates of $1 billion, TSA had estimated that the costs incurred by air carriers in 2000 were $750 million, but the amounts reported by air carriers totaled $319 million, significantly less than expected. To provide the Congress with an independent assessment, the Department of Homeland Security Appropriations Act, 2005 required GAO to review the amount of passenger and property screening costs incurred by air carriers in 2000."
Date: April 18, 2005
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Bureau of the Public Debt: Areas for Improvement in Information Security Controls (open access)

Bureau of the Public Debt: Areas for Improvement in Information Security Controls

Correspondence issued by the Government Accountability Office with an abstract that begins "In connection with fulfilling our requirement to audit the financial statements of the U.S. government, we audited and reported on the Schedules of Federal Debt Managed by the Bureau of the Public Debt (BPD) for the fiscal years ended September 30, 2004 and 2003. As part of these audits, we performed a review of the general and application information security controls over key BPD financial systems. As we reported in connection with our audit of the Schedules of Federal Debt for the fiscal years ended September 30, 2004 and 2003, BPD maintained, in all material respects, effective internal control, including general and application information security controls, relevant to the Schedule of Federal Debt related to financial reporting and compliance with applicable laws and regulations as of September 30, 2004, that provided reasonable assurance that misstatements, losses, or noncompliance material in relation to the Schedule of Federal Debt would be prevented or detected on a timely basis. We found matters involving information security controls that we do not consider to be reportable conditions, but that nevertheless warrant BPD management's attention and action. This report presents the results of our …
Date: April 18, 2005
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
No Child Left Behind Act: Education Actions May Help Improve Implementation and Evaluation of Supplemental Educational Services (open access)

No Child Left Behind Act: Education Actions May Help Improve Implementation and Evaluation of Supplemental Educational Services

Testimony issued by the Government Accountability Office with an abstract that begins "The No Child Left Behind Act (NCLBA) requires districts with schools that receive Title I funds and that have not met state performance goals for 3 consecutive years to offer low-income students supplemental educational services (SES), such as tutoring. This testimony discusses early implementation of SES, including how (1) SES participation changed in recent years; (2) providers work with districts to deliver services; (3) states monitor and evaluate SES; and (4) the U.S. Department of Education (Education) monitors and supports SES implementation. This testimony is based on an August 2006 report (GAO-06-758) and also provides information on actions Education has taken that respond to our recommendations. For the report, GAO surveyed all states and a nationally representative sample of districts with schools required to offer SES, visited four school districts, and interviewed SES providers."
Date: April 18, 2007
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Immigration Benefits: Seventh Report Required by the Haitian Immigration Fairness Act of 1998 (open access)

Immigration Benefits: Seventh Report Required by the Haitian Immigration Fairness Act of 1998

Correspondence issued by the General Accounting Office with an abstract that begins "The Haitian Refugee Immigration Fairness Act (HRIFA) of 1998 authorized certain Haitian nationals and their dependents to apply to adjust their status to legal permanent residence. Section 902(k) of the act requires the Comptroller General to report every six months on the number of Haitian nationals who have applied and been approved to adjust their status to legal permanent residence. The reports are to contain a breakdown of the numbers who applied and the number who were approved as asylum applicants, parolees, children without parents, orphaned children, or abandoned children, and unmarried sons or daughters. As of March 31, 2002, the Immigration and Naturalization Service had received a total of 36,420 HRIFA applications and had approved 7,351 of these applications. The Executive Office for Immigration Review had 198 applications filed and had approved 98 of them."
Date: April 18, 2002
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Managerial Cost Accounting Practices: Department of Health and Human Services and Social Security Administration (open access)

Managerial Cost Accounting Practices: Department of Health and Human Services and Social Security Administration

Correspondence issued by the Government Accountability Office with an abstract that begins "Authoritative bodies have promulgated laws, accounting standards, information system requirements, and related guidance to emphasize the need for cost information and cost management in the federal government. For example, the Chief Financial Officers (CFO) Act of 1990, contains several provisions related to managerial cost accounting, one of which states that an agency's CFO should develop and maintain an integrated accounting and financial management system that provides for the development and reporting of cost information. Statement of Federal Financial Accounting Standards No. 4, Managerial Cost Accounting Concepts and Standards for the Federal Government, and the Joint Financial Management Improvement Program's (JFMIP) Framework for Federal Financial Management Systems established accounting standards and system requirements for managerial cost accounting (MCA) information at federal agencies. The Federal Financial Management Improvement Act of 1996 built on this foundation and required, among other things, CFO Act agencies to comply substantially with federal accounting standards and federal financial management systems requirements. In light of the requirements for federal agencies to prepare MCA information, Congress asked us to determine the extent to which federal agencies develop cost information and use it for managerial decision making. The …
Date: April 18, 2006
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Grants Management: Additional Actions Needed to Streamline and Simplify Processes (open access)

Grants Management: Additional Actions Needed to Streamline and Simplify Processes

A letter report issued by the Government Accountability Office with an abstract that begins "The federal government distributed about $400 billion in federal grants in fiscal year 2003 through about 1,000 different federal grant programs administered by several federal agencies with different administrative requirements. Congress, concerned that some of these requirements may be duplicative, burdensome, or conflicting--and could impede cost-effective delivery of services--passed the Federal Financial Assistance Management Improvement Act of 1999, commonly called P.L. 106-107, and mandated that GAO assess the act's effectiveness. This report addresses (1) progress made to streamline and develop common processes for grantees and (2) the coordination among the Office of Management and Budget (OMB), the agencies, and potential grant recipients."
Date: April 18, 2005
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Drug Courts: Better DOJ Data Collection and Evaluation Efforts Needed to Measure Impact of Drug Court Programs (open access)

Drug Courts: Better DOJ Data Collection and Evaluation Efforts Needed to Measure Impact of Drug Court Programs

A letter report issued by the General Accounting Office with an abstract that begins "In exchange for the possibility of dismissed charges or reduced sentences, defendants with substance abuse problems agree to be assigned to drug court programs. In drug courts, judges generally preside over the proceedings; monitor the progress of defendants; and prescribe sanctions and rewards in collaboration with prosecutors, defense attorneys, and treatment providers. Most decisions about drug court operations are left to local jurisdictions. Although programs funded by the Drug Court Program Office (DCPO) must collect and provide performance measurement and outcome data, the Department of Justice (DOJ) has not effectively managed this effort because of (1) its inability to readily identify the universe of DCPO-funded drug court programs, including those subject to DCPO's data collection reporting requirements; (2) its inability to accurately determine the number of drug court programs responding to DCPO's semiannual data collection survey; (3) inefficiencies in the administration of DCPO's semiannual data collection effort; (4) the elimination of post-program impact questions from the data collection survey effort; and (5) the lack of use of the Drug Court Clearinghouse. Various administrative and research factors have also hampered DOJ's ability to complete the two-phase National …
Date: April 18, 2002
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
DOD Personnel: More Consistency Needed in Determining Eligibility for Top Secret Security Clearances (open access)

DOD Personnel: More Consistency Needed in Determining Eligibility for Top Secret Security Clearances

A chapter report issued by the General Accounting Office with an abstract that begins "Each year, the Department of Defense (DOD) makes about 200,000 decisions to grant, deny, or revoke security clearances for its civilian, military, and contractor personnel. Through a process called adjudication, DOD personnel security specialists review the results of employees' background investigations and determine whether the individual is eligible for a clearance. This report (1) assesses whether DOD's adjudicators consistently document all significant adverse security conditions when determining individuals' eligibility for top secret security clearances and (2) identifies factors that hinder the effectiveness of DOD's adjudicative process. GAO found that DOD adjudicators have not consistently documented all significant adverse security conditions present in investigative case files when determining individuals' eligibility for top secret security clearances. DOD has been unable to demonstrate that it fully considered all significant adverse conditions often not documented, including financial matters. Several factors have hindered the effectiveness of DOD's adjudicative process. The Assistant Secretary has not (1) used common explanatory guidance, such as that contained in the Adjudicative Desk Reference he developed, or issued any other clarifying guidance to promote consistency in applying the federal guidelines; (2) required adjudicators to take DOD adjudicative …
Date: April 18, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Retired Coal Miners' Health Benefit Funds: Financial Challenges Continue (open access)

Retired Coal Miners' Health Benefit Funds: Financial Challenges Continue

A letter report issued by the General Accounting Office with an abstract that begins "More than 100,000 retired coal miners and their spouses and dependents in 1992 faced a potential decrease in their employment-related health insurance coverage or loss of such coverage altogether. Some former employers had stopped mining coal or gone out of business and were no longer contributing to the United Mine Workers of America (UMWA) retiree benefit funds. To ensure that these individuals would continue to receive the health benefits specified in previous collective bargaining agreements reached with coal companies, often gained in exchange for lower pensions, Congress enacted the Coal Industry Retiree Health Benefit Act of 1992 (Coal Act). The Coal Act replaced the existing UMWA benefit funds with the Combined Benefit Fund (CBF) and the 1992 Benefit Plan. These funds' benefits requires less cost sharing by beneficiaries and provides more extensive coverage than benefit packages offered by the major manufacturing companies and companies with unionized workforces. However, the extent of coverage is generally comparable. The cost of health care for the funds' beneficiaries in 1999 was about 29 percent higher than for demographically similar Medicare beneficiaries with employer-sponsored insurance. The funds' officials have attempted to …
Date: April 18, 2002
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Coast Guard: Observations on the Fiscal Year 2008 Budget, Performance, Reorganization, and Related Challenges (open access)

Coast Guard: Observations on the Fiscal Year 2008 Budget, Performance, Reorganization, and Related Challenges

Testimony issued by the Government Accountability Office with an abstract that begins "The U. S. Coast Guard is a multimission agency responsible for maritime safety, security, and stewardship. It performs these missions, relating to homeland security and non-homeland security in U.S. ports and inland waterways, along the coasts, and on international waters. The President's budget request, including the request for the Coast Guard, was transmitted to Congress on February 5, 2007. This testimony, which is based on current and past GAO work, synthesizes the results of this work as it pertains to the following: budget requests and performance goals, organizational changes and related management initiatives, current acquisition efforts and challenges, and challenges related to performing traditional legacy missions."
Date: April 18, 2007
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Nuclear Waste: Uncertainties About the Yucca Mountain Repository Project (open access)

Nuclear Waste: Uncertainties About the Yucca Mountain Repository Project

Testimony issued by the General Accounting Office with an abstract that begins "As required by law, the Department of Energy (DOE) has been investigating a site at Yucca Mountain, Nevada, to determine its suitability for disposing of highly radioactive wastes in a mined geologic repository. If the site is approved, DOE must apply to the Nuclear Regulatory Commission (NRC) for authorization to construct a repository. If the site is not approved for a license application, or if NRC denies a license to construct a repository, the administration and Congress will have to consider other options for the long-term management of existing and future nuclear wastes. DOE is not prepared to submit an acceptable license application to the NRC within the statutory limits that would take effect if the site is approved. DOE is unlikely to achieve its goal of opening a repository at Yucca Mountain by 2010. Sufficient time would not be available for DOE to obtain a license from NRC and construct enough of the repository to open it in 2010. Another key factor is whether DOE will be able to obtain the increases in annual funding that would be required to open the repository by 2010. DOE currently …
Date: April 18, 2002
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Federal Real Property: Views on Real Property Reform Issues (open access)

Federal Real Property: Views on Real Property Reform Issues

Testimony issued by the General Accounting Office with an abstract that begins "The Federal Property Asset Management Reform Act of 2002, will enhance federal real and personal property management and bring the policies and business practices of federal agencies into the 21st century. Available data show that the federal government owns hundreds of thousands of properties worldwide, including military installations, office buildings, laboratories, courthouses, embassies, postal facilities, national parks, forests, and other public lands, estimated to be worth billions of dollars. Most of this government-owned real property is under the custody and control of eight agencies--the Department of Agriculture, Defense, Energy, the Interior, and Veterans Affairs; General Services Administration; the Tennessee Valley Authority; and the U.S. Postal Service. Federal property managers have a large deferred maintenance backlog, obsolete and underutilized properties, and changing facility needs due to rapid advances in technology. It is important that real property-holding agencies link their real property strategic plans to their missions and related capital management and performance plans; ensure that senior real property officers have the knowledge, skills, and expertise needed to effectively perform their duties; are accountable for the reliability, usefulness, and timeliness of their data; and adopt an effective process to monitor …
Date: April 18, 2002
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Defense Transportation: Monitoring Costs and Benefits Needed While Implementing a New Program for Moving Household Goods (open access)

Defense Transportation: Monitoring Costs and Benefits Needed While Implementing a New Program for Moving Household Goods

A letter report issued by the General Accounting Office with an abstract that begins "The Department of Defense (DOD) spends more than $1.7 billion each year to move and store over 600,000 household goods shipments when relocating military personnel. It conducted and evaluated several pilot program studies aimed at fixing its problem-plagued program and, in 2002, issued a report to Congress with three recommendations. The 1997 Defense Appropriations Act Conference Report directed GAO to validate the results achieved by the pilot programs. In response, GAO examined the extent to which DOD's recommendations to Congress (1) offer solutions to long-standing problems in the current program and (2) are supported by the evaluation's findings and should be implemented. GAO also assessed the soundness of methodologies used by DOD to develop cost estimates to implement the recommendations."
Date: April 18, 2003
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
A High-Order Finite-Volume Algorithm for Fokker-Planck Collisions in Magnetized Plasmas (open access)

A High-Order Finite-Volume Algorithm for Fokker-Planck Collisions in Magnetized Plasmas

A high-order finite volume algorithm is developed for the Fokker-Planck Operator (FPO) describing Coulomb collisions in strongly magnetized plasmas. The algorithm is based on a general fourth-order reconstruction scheme for an unstructured grid in the velocity space spanned by parallel velocity and magnetic moment. The method provides density conservation and high-order-accurate evaluation of the FPO independent of the choice of the velocity coordinates. As an example, a linearized FPO in constant-of-motion coordinates, i.e. the total energy and the magnetic moment, is developed using the present algorithm combined with a cut-cell merging procedure. Numerical tests include the Spitzer thermalization problem and the return to isotropy for distributions initialized with velocity space loss cones. Utilization of the method for a nonlinear FPO is straightforward but requires evaluation of the Rosenbluth potentials.
Date: April 18, 2007
Creator: Xiong, Z; Cohen, R H; Rognlien, T D & Xu, X Q
Object Type: Article
System: The UNT Digital Library
Star-Formation in Low Radio Luminosity AGN from the Sloan Digital Sky Survey (open access)

Star-Formation in Low Radio Luminosity AGN from the Sloan Digital Sky Survey

We investigate faint radio emission from low- to high-luminosity Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey (SDSS). Their radio properties are inferred by coadding large ensembles of radio image cut-outs from the FIRST survey, as almost all of the sources are individually undetected. We correlate the median radio flux densities against a range of other sample properties, including median values for redshift, [O III] luminosity, emission line ratios, and the strength of the 4000{angstrom} break. We detect a strong trend for sources that are actively undergoing star-formation to have excess radio emission beyond the {approx} 10{sup 28} ergs s{sup -1} Hz{sup -1} level found for sources without any discernible star-formation. Furthermore, this additional radio emission correlates well with the strength of the 4000{angstrom} break in the optical spectrum, and may be used to assess the age of the star-forming component. We examine two subsamples, one containing the systems with emission line ratios most like star-forming systems, and one with the sources that have characteristic AGN ratios. This division also separates the mechanism responsible for the radio emission (star-formation vs. AGN). For both cases we find a strong, almost identical, correlation between [O III] and radio luminosity, …
Date: April 18, 2007
Creator: de Vries, W. H.; Hodge, J. A.; Becker, R. H.; White, R. L. & Helfand, D. J.
Object Type: Article
System: The UNT Digital Library
Preliminary Benchmarking Efforts and MCNP Simulation Results for Homeland Security (open access)

Preliminary Benchmarking Efforts and MCNP Simulation Results for Homeland Security

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 measurement benchmark. From this very basic measurement, MCNP input stacks are generated and validated both in predicted signal amplitude and spectral shape. Not modeled at this time are those perturbations from the more recent pulse height light (PHL) tally feature, although what spectral deviations are seen can be largely attributed to not including this small correction. The value of this work is as a proof-of-concept demonstration that with well documented historical testing can be converted into formal radiation measurement benchmarks. This effort would support virtual testing of algorithms and new detector configurations.
Date: April 18, 2008
Creator: Hayes, Robert
Object Type: Article
System: The UNT Digital Library
ASC Predictive Science Academic Alliance Program Verification and Validation Whitepaper (open access)

ASC Predictive Science Academic Alliance Program Verification and Validation Whitepaper

None
Date: April 18, 2006
Creator: Klein, R.; Doebling, S.; Graziani, F.; Pilch, M. & Trucano, T.
Object Type: Report
System: The UNT Digital Library
Study of B Meson Decays with Excited eta and eta-prime Mesons (open access)

Study of B Meson Decays with Excited eta and eta-prime Mesons

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 +}, and place upper limits on the decays B{sup +} {yields} {eta}(1405)K{sup +}, B{sup +} {yields} f{sub 1}(1285)K{sup +}, B{sup +} {yields} f{sub 1}(1420)K{sup +}, and B{sup +} {yields} {phi}(1680)K{sup +}.
Date: April 18, 2008
Creator: Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V. et al.
Object Type: Article
System: The UNT Digital Library
Fiberoptics-Based Instrumentation for Storage Ring BeamDiagnostics (open access)

Fiberoptics-Based Instrumentation for Storage Ring BeamDiagnostics

In several cases, coupling synchrotron light into opticalfibers can substantially facilitate the use of beam diagnosticinstrumentation, that measures longitudinal beam properties by detectingsynchrotron radiation. It has been discussed in [1]with some detail, howfiberoptics can bring the light at relatively large distances from theaccelerator, where a variety of devices can be used to measure beamproperties and parameters. Light carried on a fiber can be easilyswitched between instruments so that each one of them has 100 percent ofthe photons available, rather than just a fraction , when simultaneousmeasurements are not indispensable. From a more general point of view,once synchrotron light is coupled into the fiber, the vast array oftechniques and optoelectronic devices, developed by the telecommunicationindustry becomes available.In this paper we present the results of ourexperiments at the Advanced Light Source, where we tried to assess thechallenges and limitations of the coupling process and determine whatlevel of efficiency one can typically expect to achieve.
Date: April 18, 2007
Creator: Byrd, John M.; De Santis, Stefano & Yin, Yan
Object Type: Article
System: The UNT Digital Library
IMPACT OF SB4 TANK 40 DECANT AND ARP/MCU ADDITIONS WITH/WITHOUT ADDED CAUSTIC ON DWPF CPC PERFORMANCE (open access)

IMPACT OF SB4 TANK 40 DECANT AND ARP/MCU ADDITIONS WITH/WITHOUT ADDED CAUSTIC ON DWPF CPC PERFORMANCE

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 included considering an addition of sodium hydroxide to Tank 40 to partially offset the sodium lost during decanting as well as considering the impact of bounding quantities of Actinide Removal Process (ARP) feed and Modular Caustic-Side Solvent Extraction Unit (MCU) feed on these same parameters. Simulated SB4 waste was first adjusted to match the dilution that has occurred in Tank 40 during the initial period of SB4 operations in the DWPF. The adjusted simulant was decanted an equivalent of 100,000 gallons relative to 413,740 gallons projected supernate volume. The decanted simulant was divided into two equal parts. One part received an addition of sodium hydroxide to increase the Na{sub 2}O content of the calcined sludge solids by about 3%. The baseline decanted simulant and caustic adjusted …
Date: April 18, 2008
Creator: Koopman, D; David Best, D & Frances Williams, F
Object Type: Report
System: The UNT Digital Library