40 Matching Results

Search Results

Results: 1 - 24 next
open access

National Nuclear Security Administration: Observations on NNSA's Management and Oversight of the Nuclear Security Enterprise

Description: Testimony issued by the Government Accountability Office with an abstract that begins "NNSA has successfully ensured that the nuclear weapons stockpile remains safe and reliable in the absence of underground nuclear testing, accomplishing this complicated task by using state-of-the-art facilities as well as the skills of top scientists. Nevertheless, NNSA does not have reliable enterprise-wide management information on program budgets and costs, which potentially increases risk to NNSA’s progra… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Safety Effects of Less Prescriptive Requirements for Low-Stress Natural Gas Transmission Pipelines Are Uncertain

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "Applying PHMSA’s new distribution integrity management requirements to low-stress transmission pipelines would result in less prescriptive safety requirements for these pipelines. Overall, requirements for distribution pipelines are less prescriptive than requirements for transmission pipelines in part because the former operate at lower pressure and pose lower risks in general than the latter. For examp… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Defined Benefit Pension Plans: Recent Developments Highlight Challenges of Hedge Fund and Private Equity Investing

Description: A letter report issued by the Government Accountability Office with an abstract that begins "While plan representatives GAO contacted generally stated that their hedge fund and private equity investments met expectations in recent years, a number of plans experienced losses and other challenges, such as limited liquidity and transparency. National data indicated that hedge fund and private equity investments were significantly affected by the 2008-2009 financial crisis, and plans and experts GA… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Workforce Investment Act: Innovative Collaborations between Workforce Boards and Employers Helped Meet Urgent Local Workforce Needs

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Workforce board officials and their partners in the 14 initiatives cited a range of factors that facilitated building innovative collaborations. Almost all of the collaborations grew out of efforts to address urgent workforce needs of multiple employers in a specific sector, rather than focusing on individual employers. The partners in these initiatives made extra effort to engage employers so they could tail… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Air Traffic Control Modernization: Management Challenges Associated with Program Costs and Schedules Could Hinder NextGen Implementation

Description: A letter report issued by the Government Accountability Office with an abstract that begins "In a review of 30 major ATC acquisition programs, all of which will contribute to the transition to NextGen, GAO found that costs for 11 of the 30 programs have increased from their initial estimates by a total of $4.2 billion and 15 programs experienced delays. The 11 acquisitions that experienced cost increases account for over 60 percent of FAA’s total acquisition costs ($11 billion of $17.7 billion)… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Senate Preservation Fund: Audit of Fiscal Years 2009 and 2010 Transactions

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "For fiscal years 2009 and 2010, the Fund’s recorded transactions consisted of 136 investment and operating transactions recorded and accounted for by the Library. The Fund’s recorded transactions were authorized in advance, supported by documentation, and accurately accounted for. However, while the Fund’s transactions were generally recorded promptly, we did identify five instances where transactions we… more
Date: February 16, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

AdS/QCD, Light-Front Holography, and Sublimated Gluons

Description: The gauge/gravity duality leads to a simple analytical and phenomenologically compelling nonperturbative approximation to the full light-front QCD Hamiltonian - 'Light-Front Holography', which provides a Lorentz-invariant first-approximation to QCD, and successfully describes the spectroscopy of light-quark meson and baryons, their elastic and transition form factors, and other hadronic properties. The bound-state Schroedinger and Dirac equations of the soft-wall AdS/QCD model predict linear Re… more
Date: February 16, 2012
Creator: Brodsky, Stanley J. & de Teramond, Guy F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CALIBRATION OF X-RAY IMAGING DEVICES FOR ACCURATE INTENSITY MEASUREMENT

Description: National Security Technologies (NSTec) has developed calibration procedures for X-ray imaging systems. The X-ray sources that are used for calibration are both diode type and diode/fluorescer combinations. Calibrating the X-ray detectors is key to accurate calibration of the X-ray sources. Both energy dispersive detectors and photodiodes measuring total flux were used. We have developed calibration techniques for the detectors using radioactive sources that are traceable to the National Institu… more
Date: February 16, 2012
Creator: Haugh, M. J.; Charest, M. R.; Ross, P. W.; Lee, J. J.; Schneider, M. B.; Palmer, N. E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Visualization of Target Inspection data at the National Ignition Facility

Description: As the National Ignition Facility continues its campaign to achieve ignition, new methods and tools will be required to measure the quality of the target capsules used to achieve this goal. Techniques have been developed to measure capsule surface features using a phase-shifting diffraction interferometer and Leica Microsystems confocal microscope. These instruments produce multi-gigabyte datasets which consist of tens to hundreds of files. Existing software can handle viewing a small subset of… more
Date: February 16, 2012
Creator: Potter, D & Antipa, N
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transversity from First Principles in QCD

Description: Transversity observables, such as the T-odd Sivers single-spin asymmetry measured in deep inelastic lepton scattering on polarized protons and the distributions which are measured in deeply virtual Compton scattering, provide important constraints on the fundamental quark and gluon structure of the proton. In this talk I discuss the challenge of computing these observables from first principles; i.e.; quantum chromodynamics, itself. A key step is the determination of the frame-independent light… more
Date: February 16, 2012
Creator: Brodsky, Stanley J. & /SLAC /Southern Denmark U., CP3-Origins
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Scale Setting Using the Extended Re normalization Group and the Principle of Maximal Conformality: the QCD Coupling at Four Loops

Description: A key problem in making precise perturbative QCD predictions is to set the proper renormalization scale of the running coupling. The extended renormalization group equations, which express the invariance of physical observables under both the renormalization scale- and scheme-parameter transformations, provide a convenient way for estimating the scale- and scheme-dependence of the physical process. In this paper, we present a solution for the scale-equation of the extended renormalization group… more
Date: February 16, 2012
Creator: Brodsky, Stanley J. & Wu, Xing-Gang
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analytic Coleman-de Luccia Geometries

Description: We present the necessary and sufficient conditions for a Euclidean scale factor to be a solution of the Coleman-de Luccia equations for some analytic potential V ({psi}), with a Lorentzian continuation describing the growth of a bubble of lower-energy vacuum surrounded by higher-energy vacuum. We then give a set of explicit examples that satisfy the conditions and thus are closed-form analytic examples of Coleman-de Luccia geometries.
Date: February 16, 2012
Creator: Dong, Xi; /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC; Harlow, Daniel & /Stanford U., ITP /Stanford U., Phys. Dept.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Elementary Steps of Syngas Reactions on Mo2C(001): Adsorption Thermochemistry and Bond Dissociation

Description: Density functional theory (DFT) and ab initio thermodynamics are applied in order to investigate the most stable surface and subsurface terminations of Mo{sub 2}C(001) as a function of chemical potential and in the presence of syngas. The Mo-terminated (001) surface is then used as a model surface to evaluate the thermochemistry and energetic barriers for key elementary steps in syngas reactions. Adsorption energy scaling relations and Broensted-Evans-Polanyi relationships are established and u… more
Date: February 16, 2012
Creator: Medford, Andrew
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Building Cooling and Air Conditioning

Description: Advanced Research Projects Agency-Energy project sheet summarizing general information about the 15 projects that are a part of the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including project goals, innovation needs, and potential impacts.
Date: February 16, 2012
Creator: United States. Advanced Research Projects Agency-Energy.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

ADVANCED COMPOSITE WIND TURBINE BLADE DESIGN BASED ON DURABILITY AND DAMAGE TOLERANCE

Description: The objective of the program was to demonstrate and verify Certification-by-Analysis (CBA) capability for wind turbine blades made from advanced lightweight composite materials. The approach integrated durability and damage tolerance analysis with robust design and virtual testing capabilities to deliver superior, durable, low weight, low cost, long life, and reliable wind blade design. The GENOA durability and life prediction software suite was be used as the primary simulation tool. First, a … more
Date: February 16, 2012
Creator: Abumeri, Galib & Abdi, Frank
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NEAMS Update. Quarterly Report for October - December 2011.

Description: The Advanced Modeling and Simulation Office within the DOE Office of Nuclear Energy (NE) has been charged with revolutionizing the design tools used to build nuclear power plants during the next 10 years. To accomplish this, the DOE has brought together the national laboratories, U.S. universities, and the nuclear energy industry to establish the Nuclear Energy Advanced Modeling and Simulation (NEAMS) Program. The mission of NEAMS is to modernize computer modeling of nuclear energy systems and … more
Date: February 16, 2012
Creator: Bradley, K. (Nuclear Engineering Division)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Emergent Phenomena at Oxide Interfaces

Description: Transition metal oxides (TMOs) are an ideal arena for the study of electronic correlations because the s-electrons of the transition metal ions are removed and transferred to oxygen ions, and hence the strongly correlated d-electrons determine their physical properties such as electrical transport, magnetism, optical response, thermal conductivity, and superconductivity. These electron correlations prohibit the double occupancy of metal sites and induce a local entanglement of charge, spin, and… more
Date: February 16, 2012
Creator: Hwang, H.Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Impact of SuperB on Flavor Physics

Description: This report provides a succinct summary of the physics programme of SuperB, and describes that potential in the context of experiments making measurements in flavour physics over the next 10 to 20 years. Detailed comparisons are made with Belle II and LHCb, the other B physics experiments that will run in this decade. SuperB will play a crucial role in defining the landscape of flavour physics over the next 20 years. SuperB is an approved high luminosity e{sup +}e{sup -} collider intended to se… more
Date: February 16, 2012
Creator: Meadows, B.; Blanke, M.; Stocchi, A.; Drutskoy, A.; Cervelli, A.; Giorgi, M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simple Limits on Achieving A Quasi-Linear Magnetic Compression for an FEL Driver

Description: Free electron lasers (FEL) need a very bright electron beam in three dimensions and a high peak charge density. In order to compress an initially longer electron bunch generated from the photoinjector, magnetic bunch compression systems are widely employed. In this paper, first harmonic RF linearization and its associated requirements are reviewed. Meanwhile it is also briefly discussed what is the relation between a proper initial bunch length and main RF frequency, when a harmonic RF lineariz… more
Date: February 16, 2012
Creator: Sun, Yipeng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Light-Front Holographic QCD

Description: The relation between the hadronic short-distance constituent quark and gluon particle limit and the long-range confining domain is yet one of the most challenging aspects of particle physics due to the strong coupling nature of Quantum Chromodynamics, the fundamental theory of the strong interactions. The central question is how one can compute hadronic properties from first principles; i.e., directly from the QCD Lagrangian. The most successful theoretical approach thus far has been to quantiz… more
Date: February 16, 2012
Creator: Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; de Teramond, Guy F. & U., /Costa Rica
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

AdS/QCD and Applications of Light-Front Holography

Description: Light-Front Holography leads to a rigorous connection between hadronic amplitudes in a higher dimensional anti-de Sitter (AdS) space and frame-independent light-front wavefunctions of hadrons in 3 + 1 physical space-time, thus providing a compelling physical interpretation of the AdS/CFT correspondence principle and AdS/QCD, a useful framework which describes the correspondence between theories in a modified AdS5 background and confining field theories in physical space-time. To a first semicla… more
Date: February 16, 2012
Creator: Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; Cao, Fu-Guang; U., /Massey; de Teramond, Guy F. & U., /Costa Rica
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Atoms in Flight: The Remarkable Connections between Atomic and Hadronic Physics

Description: Atomic physics and hadron physics are both based on Yang Mills gauge theory; in fact, quantum electrodynamics can be regarded as the zero-color limit of quantum chromodynamics. I review a number of areas where the techniques of atomic physics provide important insight into the theory of hadrons in QCD. For example, the Dirac-Coulomb equation, which predicts the spectroscopy and structure of hydrogenic atoms, has an analog in hadron physics in the form of light-front relativistic equations of mo… more
Date: February 16, 2012
Creator: Brodsky, Stanley J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pair Production Constraints on Superluminal Neutrinos Revisited

Description: We revisit the pair creation constraint on superluminal neutrinos considered by Cohen and Glashow in order to clarify which types of superluminal models are constrained. We show that a model in which the superluminal neutrino is effectively light-like can evade the Cohen-Glashow constraint. In summary, any model for which the CG pair production process operates is excluded because such timelike neutrinos would not be detected by OPERA or other experiments. However, a superluminal neutrino which… more
Date: February 16, 2012
Creator: Brodsky, Stanley J. & Gardner, Susan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen