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Air Traffic Control: FAA's Acquisition Management Has Improved, but Policies and Oversight Need Strengthening to Help Ensure Results
A letter report issued by the Government Accountability Office with an abstract that begins "The Federal Aviation Administration's (FAA) multibillion-dollar effort to modernize the nation's air traffic control (ATC) system has resulted in cost, schedule, and performance shortfalls for over two decades and has been on GAO's list of high-risk federal programs since 1995. According to FAA, performance shortfalls were due, in part, to restrictions imposed by federal acquisition and personnel regulations. In response, Congress granted FAA exemptions in 1995 and directed it to develop a new acquisition management system. In this report, GAO compared FAA's AMS with (1) the FAR and (2) commercial best practices for major acquisitions, and (3) examined FAA's implementation of AMS and its progress in resolving problems with major acquisitions."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
VA and DOD Health Care: Efforts to Coordinate a Single Physical Exam Process for Servicemembers Leaving the Military
A letter report issued by the Government Accountability Office with an abstract that begins "Servicemembers who leave the military and file disability claims with the Department of Veterans Affairs (VA) may be subject to potentially duplicative physical exams in order to meet requirements of both the Department of Defense's (DOD) military services and VA. To streamline the process for these servicemembers, the military services and VA have attempted to coordinate their physical exam requirements by developing a single separation exam program. In 1998, VA and DOD signed a memorandum of understanding (MOU) instructing local units to establish single separation exam programs. This report examines (1) VA's and the military services' efforts to establish single separation exam programs, and (2) the challenges to establishing single separation exam programs. To obtain this information, GAO interviewed VA and military service officials about establishing the program; evaluated existing programs at selected military installations; and visited selected installations that did not have programs."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Nursing Home Deaths: Arkansas Coroner Referrals Confirm Weaknesses in State and Federal Oversight of Quality of Care
A letter report issued by the Government Accountability Office with an abstract that begins "GAO was asked to assess the effectiveness of nursing home oversight by considering the effect of a unique Arkansas law that requires county coroners to investigate all nursing home deaths. Coroners refer cases of suspected neglect to the state survey agency and law enforcement entities such as the state Medicaid Fraud Control Unit (MFCU). The Centers for Medicare & Medicaid Services (CMS) contracts with survey agencies in every state to periodically inspect nursing homes and investigate allegations of poor care or neglect. MFCUs are charged with investigating and prosecuting resident neglect. GAO examined (1) the results of Arkansas coroner investigations, (2) the state survey agency's experience in investigating coroner referrals, and (3) whether weaknesses in state and federal nursing home oversight identified in prior GAO reports were evident in the survey agency's investigation of coroner referrals."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Census 2000: Design Choices Contributed to Inaccuracy of Coverage Evaluation Estimates
A letter report issued by the Government Accountability Office with an abstract that begins "Evaluations of past censuses show that certain groups were undercounted compared to other groups, a problem known as "coverage error." To address this, the Census Bureau included in its 2000 Census design the Accuracy and Coverage Evaluation Program (A.C.E.) to (1) measure coverage error and (2) use the results to adjust the census, if warranted. However, the Bureau found the A.C.E. results inaccurate and decided not to adjust or plan for adjustment in 2010. Congress asked GAO to determine (1) factors contributing to A.C.E.'s reported failure to accurately estimate census coverage error, and (2) the reliability of the revised coverage error estimates the Bureau subsequently produced. To do this, GAO examined three sets of Bureau research published in March 2001, October 2001, and March 2003 and interviewed Bureau officials."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
State Department: Diplomatic Security's Recent Growth Warrants Strategic Review
A letter report issued by the Government Accountability Office with an abstract that begins "State Department's (State) Bureau of Diplomatic Security (Diplomatic Security) is responsible for the protection of people, information, and property at over 400 foreign missions and domestic locations. Diplomatic Security must be prepared to counter threats such as crime, espionage, visa and passport fraud, technological intrusions, political violence, and terrorism. The Government Accountability Office (GAO) was asked to assess (1) how Diplomatic Security's mission has evolved since 1998, (2) how its resources have changed over the last 10 years, and (3) the challenges it faces in conducting its missions. GAO analyzed Diplomatic Security data; reviewed relevant documents; and interviewed officials at several domestic facilities and 18 international missions."
Date:
November 12, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Defense Health Care: Force Health Protection and Surveillance Policy Compliance Was Mixed, but Appears Better for Recent Deployments
A letter report issued by the Government Accountability Office with an abstract that begins "A lack of servicemember health and deployment data hampered investigations into the nature and causes of illnesses reported by many servicemembers following the 1990-91 Persian Gulf War. Public Law 105-85, enacted in November 1997, required the Department of Defense (DOD) to establish a system to assess the medical condition of servicemembers before and after deployments. Following its September 2003 report examining Army and Air Force compliance with DOD's force health protection and surveillance policies for Operation Enduring Freedom (OEF) and Operation Joint Guardian (OJG), GAO was asked in November 2003 to also determine (1) the extent to which the services met DOD's policies for Operation Iraqi Freedom (OIF) and, where applicable, compare results with OEF/OJG; and (2) what steps DOD has taken to establish a quality assurance program to ensure that the military services comply with force health protection and surveillance policies."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Single-Family Housing: Progress Made, but Opportunities Exist to Improve HUD's Oversight of FHA Lenders
A letter report issued by the Government Accountability Office with an abstract that begins "Every year, the Department of Housing and Urban Development (HUD), through its Federal Housing Administration (FHA), insures billions of dollars in home mortgage loans made by private lenders. Oversight of lenders has historically been a challenge for HUD. In January 2003, GAO reported that, due in part to poor lender oversight, HUD's single-family mortgage insurance programs remained a high-risk area. This report examines (1) how well HUD follows its guidance when granting lenders direct endorsement authority (the ability to underwrite loans and determine their eligibility for FHA mortgage insurance without HUD's prior review), (2) the extent to which HUD uses a risk-based approach when monitoring FHA lenders, and (3) the extent to which HUD holds accountable lenders that it identifies as not complying with its performance requirements."
Date:
November 12, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
SSA Disability Decision Making: Additional Steps Needed to Ensure Accuracy and Fairness of Decisions at the Hearing Level
A letter report issued by the General Accounting Office with an abstract that begins "Historically, the proportion of the Social Security Administration's (SSA) disability benefits claims that were approved has been lower for African-Americans than for whites. In 1992, GAO found that racial differences, largely at the Administrative Law Judge (ALJ) level, could not be completely explained by factors related to the decision-making process. This report examines how race and other factors influence ALJ decisions and assesses SSA's ability to ensure the accuracy and fairness of ALJ decisions."
Date:
November 12, 2003
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Coast Guard: Strategy Needed for Setting and Monitoring Levels of Effort for All Missions
A letter report issued by the General Accounting Office with an abstract that begins "The September 11th attacks affected the scope of activities of many federal agencies, including the Coast Guard. Homeland security, a long-standing but relatively small part of the Coast Guard's duties, took center stage. Still, the Coast Guard remains responsible for many other missions, such as helping stem the flow of drugs and illegal migration, protecting important fishing grounds, and responding to marine pollution. GAO was asked to review the Coast Guard's current efforts and future plans for balancing resource levels among its many missions."
Date:
November 12, 2002
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
International Monetary Fund: Lending Programs Allow for Negotiations and Are Consistent with Economic Literature
A letter report issued by the Government Accountability Office with an abstract that begins "The International Monetary Fund (IMF) has significantly increased its total committed lending to countries from about $3.5 billion in August 2008 to about $170.4 billion in August 2009, as countries have been severely affected by the global economic crisis. IMF-supported programs are intended to help countries overcome balance-of-payments problems, stabilize their economies, and restore sustainable economic growth. Critics have long-standing concerns that the IMF has an overly austere approach to macroeconomic policy that does not sufficiently heed country viewpoints. To help address these concerns, the IMF recently stated that it has changed its policies, including by increasing its flexibility. GAO was asked to examine (1) the process for designing an IMF-supported program, (2) the IMF-supported programs in four recipient countries, and (3) the extent to which the findings of empirical economic studies are consistent with the IMF's macroeconomic policies. GAO analyzed IMF and recipient country documents; interviewed U.S., IMF, and foreign government officials, conducting fieldwork in four relatively large recipient countries; and analyzed published or widely cited empirical studies. GAO received written comments from the Department of the Treasury, noting its concurrence with the report's conclusions."
Date:
November 12, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Defense Acquisitions: Strategic Airlift Gap Has Been Addressed, but Tactical Airlift Plans Are Evolving as Key Issues Have Not Been Resolved
A letter report issued by the Government Accountability Office with an abstract that begins "Department of Defense (DOD) used nearly 700 aircraft, as well as commercial and leased aircraft, to carry about 3 million troops and 800,000 tons of cargo in support of wartime, peacetime, and humanitarian efforts in 2008. C-5s and C-17s move troops and cargo internationally (strategic airlift) and C-130s are the primary aircraft that moves them within a theater of operation (tactical airlift). Over the next 4 years, DOD plans to spend about $12 billion to modernize and procure airlifters and is currently studying how many it needs. The Government Accountability Office (GAO) was asked to (1) identify the status of DOD's modernization and acquisition efforts and (2) determine how well DOD is addressing any capability gaps and redundancies. In conducting this work, GAO identified the cost, schedule, and performance of airlift programs, as well as DOD's plan for addressing gaps and redundancies. GAO also discussed mobility study efforts with DOD, Institute for Defense Analysis (IDA), and RAND Coporation officials."
Date:
November 12, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Expulsion and Censure Actions Taken by the Full Senate Against Members
The Senate has censured nine Senators for various misconduct, including conduct not a violation of any law or specific written Senate ethics rule, when such conduct is found contrary to "acceptable norms of ethical conduct in the Senate," contrary to "accepted morals" and "senatorial ethics," when found to "derogate from the public trust expected of a Senator," and/or found to be "reprehensible" conduct which brings the Senate into "dishonor and disrepute." Conduct resulting in Senate "censure" has included violating orders of secrecy of documents; fighting in the Senate ("censure"); allowing a lobbyist with interests in particular legislation to be on official staff with access to the secret considerations of the legislation by committee ("condemn"); non-cooperation and abuse of investigating committees of the Senate ("condemn"); financial irregularities concerning political contributions ("censure"), office expenses and contributions ("denounce"), and excessive honoraria, official reimbursements and gifts ("denounce").
Date:
November 12, 2008
Creator:
Maskell, Jack
Object Type:
Report
System:
The UNT Digital Library
Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt
The relationship between charge transport and mechanical properties of alkanethiol self-assembled monolayers (SAM) on Au(111) films has been investigated using an atomic force microscope with a conductive tip. Molecular tilts induced by the pressure applied by the tip cause stepwise increases in film conductivity. A decay constant {beta} = 0.57 {+-} 0.03 {angstrom}{sup -1} was found for the current passing through the film as a function of tip-substrate separation due to this molecular tilt. This is significantly smaller than the value of {approx} 1 {angstrom}{sup -1} found when the separation is changed by changing the length of the alkanethiol molecules. Calculations indicate that for isolated dithiol molecules S-bonded to hollow sites, the junction conductance does not vary significantly as a function of molecular tilt. The impact of S-Au bonding on SAM conductance is discussed.
Date:
November 12, 2007
Creator:
Mulleregan, Alice; Qi, Yabing; Ratera, Imma; Park, Jeong Y.; Ashby, Paul D.; Quek, Su Ying et al.
Object Type:
Article
System:
The UNT Digital Library
TRITIUM EFFECTS ON DYNAMIC MECHANICAL PROPERTIES OF POLYMERIC MATERIALS
Dynamic mechanical analysis has been used to characterize the effects of tritium gas (initially 1 atm. pressure, ambient temperature) exposure over times up to 2.3 years on several thermoplastics-ultrahigh molecular weight polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), and Vespel{reg_sign} polyimide, and on several formulations of elastomers based on ethylene propylene diene monomer (EPDM). Tritium exposure stiffened the elastic modulus of UHMW-PE up to about 1 year and then softened it, and reduced the viscous response monotonically with time. PTFE initially stiffened, however the samples became too weak to handle after nine months exposure. The dynamic properties of Vespel{reg_sign} were not affected. The glass transition temperature of the EPDM formulations increased approximately 4 C. following three months tritium exposure.
Date:
November 12, 2008
Creator:
Clark, E
Object Type:
Article
System:
The UNT Digital Library
A Finite-Difference Numerical Method for Onsager's Pancake Approximation for Fluid Flow in a Gas Centrifuge
Gas centrifuges exhibit very complex flows. Within the centrifuge there is a rarefied region, a transition region, and a region with an extreme density gradient. The flow moves at hypersonic speeds and shock waves are present. However, the flow is subsonic in the axisymmetric plane. The analysis may be simplified by treating the flow as a perturbation of wheel flow. Wheel flow implies that the fluid is moving as a solid body. With the very large pressure gradient, the majority of the fluid is located very close to the rotor wall and moves at an azimuthal velocity proportional to its distance from the rotor wall; there is no slipping in the azimuthal plane. The fluid can be modeled as incompressible and subsonic in the axisymmetric plane. By treating the centrifuge as long, end effects can be appropriately modeled without performing a detailed boundary layer analysis. Onsager's pancake approximation is used to construct a simulation to model fluid flow in a gas centrifuge. The governing 6th order partial differential equation is broken down into an equivalent coupled system of three equations and then solved numerically. In addition to a discussion on the baseline solution, known problems and future work possibilities are …
Date:
November 12, 2007
Creator:
de Stadler, M & Chand, K
Object Type:
Report
System:
The UNT Digital Library
Communication Requirements and Interconnect Optimization forHigh-End Scientific Applications
The path towards realizing peta-scale computing isincreasingly dependent on building supercomputers with unprecedentednumbers of processors. To prevent the interconnect from dominating theoverall cost of these ultra-scale systems, there is a critical need forhigh-performance network solutions whose costs scale linearly with systemsize. This work makes several unique contributions towards attaining thatgoal. First, we conduct one of the broadest studies to date of high-endapplication communication requirements, whose computational methodsinclude: finite-difference, lattice-bolzmann, particle in cell, sparselinear algebra, particle mesh ewald, and FFT-based solvers. Toefficiently collect this data, we use the IPM (Integrated PerformanceMonitoring) profiling layer to gather detailed messaging statistics withminimal impact to code performance. Using the derived communicationcharacterizations, we next present fit-trees interconnects, a novelapproach for designing network infrastructure at a fraction of thecomponent cost of traditional fat-tree solutions. Finally, we propose theHybrid Flexibly Assignable Switch Topology (HFAST) infrastructure, whichuses both passive (circuit) and active (packet) commodity switchcomponents to dynamically reconfigure interconnects to suit thetopological requirements of scientific applications. Overall ourexploration leads to a promising directions for practically addressingthe interconnect requirements of future peta-scale systems.
Date:
November 12, 2007
Creator:
Kamil, Shoaib; Oliker, Leonid; Pinar, Ali & Shalf, John
Object Type:
Article
System:
The UNT Digital Library
Breakdown Characteristics Study on an 18 Cell X-band Structure
A CLIC designed 18 cells, low group velocity (2.4% to 1.0% c), X-band (11.4 GHz) accelerator structure (denoted T18) was designed at CERN, its cells were built at KEK, and it was assembled and tested at SLAC. An interesting feature of this structure is that the gradient in the last cell is about 50% higher than that in the first cell. This structure has been RF conditioned at SLAC NLCTA for about 1400 hours where it incurred about 2200 breakdowns. This paper presents the characteristics of these breakdowns, including (1) the breakdown rate dependence on gradient, pulse width and conditioning time, (2) the breakdown distribution along the structure, (3) relation between breakdown and pulsed heating dependence study and (4) electric field decay time for breakdown changing over the whole conditioning time. Overall, this structure performed very well, having a final breakdown rate of less than 1e-6/pulse/m at 106 MV/m with 230 ns pulse width.
Date:
November 12, 2008
Creator:
Wang, Faya
Object Type:
Article
System:
The UNT Digital Library
Performance of a 1.3 GHZ Normal-Conducting 5-Cell Standing-Wave Cavity
A 5-cell, normal-conducting, 1.3 GHz, standing-wave (SW) cavity was built as a prototype capture accelerator for the ILC positron source. Although the ILC uses predominantly superconducting cavities, the capture cavity location in both a high radiation environment and a solenoidal magnetic field requires it to be normal conducting. With the relatively high duty ILC beam pulses (1 msec at 5 Hz) and the high gradient required for efficient positron capture (15 MV/m), achieving adequate cavity cooling to prevent significant detuning is challenging. This paper presents the operational performance of this cavity including the processing history, characteristics of the breakdown events and the acceleration gradient witnessed by a single bunch at different injection times for different rf pulse lengths.
Date:
November 12, 2008
Creator:
Wang, Faya; Adolphsen, Chris & Wang, Juwen
Object Type:
Article
System:
The UNT Digital Library
Search for lepton flavor violating decays tau to l \omega (l = e, mu)
A search for lepton flavor violating decays of a {tau} to a lighter-mass charged lepton and an {omega} vector meson is performed using 384.1 fb{sup -1} of e{sup +}e{sup -} annihilation data collected with the BABAR detector at the Stanford Linear Accelerator Center PEP-II storage ring. No signal is found, and the upper limits on the branching ratios are determined to be {beta}({tau}{sup {+-}} {yields} e{sup {+-}}{omega}) < 1.1 x 10{sup -7} and {beta}({tau}{sup {+-}} {yields} {mu}{sup {+-}}{omega}) < 1.0 x 10{sup -7} at 90% confidence level.
Date:
November 12, 2007
Creator:
Collaboration, The BABAR & Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
A validation framework for microbial forensic methods based on statistical pattern recognition
This report discusses a general approach to validating microbial forensic methods that attempt to simultaneously distinguish among many hypotheses concerning the manufacture of a questioned biological agent sample. It focuses on the concrete example of determining growth medium from chemical or molecular properties of a bacterial agent to illustrate the concepts involved.
Date:
November 12, 2007
Creator:
Velsko, S P
Object Type:
Report
System:
The UNT Digital Library
The Redshift Dependence of Gamma-Ray Absorption in the Environments of Strong-Line AGNs
The case of {gamma}-ray absorption due to photon-photon pair production of jet photons in the external photon environments, such as the accretion disk and the broad-line region radiation fields, of {gamma}-ray--loud active galactic nuclei (AGNs) that exhibit strong emission lines is considered. I demonstrate that this 'local opacity,' if detected, will almost unavoidably be redshift-dependent in the sub-TeV range. This introduces nonnegligible biases and complicates approaches for studying the evolution of the extragalactic background light with contemporary GeV instruments such as the Gamma-Ray Large Area Space Telescope (GLAST ), where the {gamma}-ray horizon is probed by means of statistical analysis of absorption features (e.g., the Fazio-Stecker relation) in AGN spectra at various redshifts. It particularly applies to strong-line quasars, where external photon fields are potentially involved in {gamma}-ray production.
Date:
November 12, 2007
Creator:
Reimer, A. & /Stanford U., HEPL /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
A Search for Direct CP Violation in Two-Body Cabibbo-Suppressed Decays of Neutral Charmed Mesons
Presented are the results of a search for direct CP violation in Cabibbo-suppressed decays of D{sup 0} to two charged daughters. The analysis described was performed on {approx}230 fb{sup -1} of the BABAR data sample, recorded at the Stanford Linear Accelerator Center and using the PEP-II electron storage rings. We measure CP asymmetries for decay to the KK and {pi}{pi} final states, as well as for the branching ratio, and develop a new technique for tagging-efficiency correction using the Cabibbo-favored K{pi} final state. We find some evidence for CP violation in decays to the KK final state and results that suggest CP violation in the {pi}{pi} final state as well.
Date:
November 12, 2007
Creator:
Flacco, Christian Julienne & /UC, Santa Cruz
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
AdS/QCD and Its Holographic Light-Front Partonic Representation
Starting from the Hamiltonian equation of motion in QCD we find a single variable light-front equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. This light-front wave equation is equivalent to the equations of motion which describe the propagation of spin-J modes on anti-de Sitter (AdS) space.
Date:
November 12, 2008
Creator:
de Teramond, Guy F. & Brodsky, Stanley J.
Object Type:
Article
System:
The UNT Digital Library
Recent progress in Hamiltonian light-front QCD
Hamiltonian light-front quantum field theory constitutes a framework for the non-perturbative solution of invariant masses and correlated parton amplitudes of self-bound systems. By choosing light-front gauge and adopting a basis function representation, we obtain a large, sparse, Hamiltonian-matrix for mass eigenstates of gauge theories that is solvable by adapting the ab initio no-core methods of nuclear many-body theory. Full covariance is recovered in the continuum limit, the infinite matrix limit. We outline our approach and discuss the computational challenges.
Date:
November 12, 2008
Creator:
Vary, J; Honkanen, H.; Li, Jun; Maris, P.; Brodsky, S. J.; Sternberg, P. et al.
Object Type:
Article
System:
The UNT Digital Library