Sample records for remain weak debt

  1. Senior Debt Fastball Presentation

    Broader source: Energy.gov [DOE]

    Plenary III: Project Finance and Investment Senior Debt Fastball Presentation Phillip Thomas, Senior Vice President of Commercial Lending, Heartland Bank

  2. Debt collection project report

    SciTech Connect (OSTI)

    Not Available

    1980-05-01T23:59:59.000Z

    In October 1979 the Office of Management and Budget initiated a review of debt collection within the Federal Government. A DOE Debt Collection Project Team was established, and seven activites were selected for review. These were Albuquerque Operations Office; Bonneville Power Administration; Chicago Operations and Regional Office; Naval Petroleum Reserves, California; Oak Ridge Operations Office; Washington Financial Services Division; and Western Area Power Administration. The team visited each of these activities to collect data on the size, age, and types of receivables managed and procedures for billing, aging, and handling overdue accounts. Various deficiencies were found to exist at several of the DOE entities that are not consistent with good management practices in the performance of their debt collection functions. Also, the Debt Collection Project Team identified a wide variation in the procedures followed by DOE activities in the management of accounts receivable, and a wide variation in the effectiveness of the debt management functions. 1 figure, 17 tables. (RWR)

  3. Sovereign Debt, Volatility and Insurance

    E-Print Network [OSTI]

    Kletzer, Kenneth

    2004-01-01T23:59:59.000Z

    J. and K. Rogoff [1989b], ‘‘LDC Debt: Is to Forgive toAsymmetries of Information and LDC Borrowing with Sovereign

  4. Sovereign Debt, Volatility and Insurance

    E-Print Network [OSTI]

    Kletzer, Kenneth

    2005-01-01T23:59:59.000Z

    J. and K. Rogoff [1989b], ‘‘LDC Debt: Is to Forgive toAsymmetries of Information and LDC Borrowing with Sovereign

  5. Historical Research on International Lending and Debt

    E-Print Network [OSTI]

    Eichengreen, Barry

    1990-01-01T23:59:59.000Z

    One Default in the literature on LDC debt Is the of the mostwas reviewed in the symposium on LDC debt published in the1990), "Secret Buybacks of LDC unpublished manuscript.

  6. Local debts, international authority : rating agencies' emergence in regulating subnational debt

    E-Print Network [OSTI]

    Sathe, Ommeed S. (Ommeed Sanjay)

    2006-01-01T23:59:59.000Z

    This thesis explores the growth of subnational debt ("SND") and the different regulatory responses to this debt. It focuses on the recent emergence of credit rating agencies (e.g. Standard & Poor's, Moody's and Fitch) as ...

  7. Michigan Technological University Debt Service Obligations

    E-Print Network [OSTI]

    Michigan Technological University Debt Service Obligations As of June 30, 2013 Current LT Series) Refunding of 2003 & 2004 Fixed Rate Bond Issues SDC Ice Plant and Partial Roof of SDC Total

  8. Bubbles and Self-Enforcing Debt

    E-Print Network [OSTI]

    Hellwig, Christian

    We characterize equilibria with endogenous debt constraints for a general equilibrium economy with limited commitment in which the only consequence of default is losing the ability to borrow in future periods. First, we ...

  9. Loans for Refinancing Debt (New York)

    Broader source: Energy.gov [DOE]

    NYBDC provides Loans for Refinancing Debt. It can refinance up to 80% of the value of the business’s collateral, and the repayment period is tied to the assets’ viability. The program has a high...

  10. A New Approach to Managing the Debt Crisis

    E-Print Network [OSTI]

    of promoting LDC growth. One possible strategy for granting debt relief is discussed as well as the type

  11. ORIGINAL PAPER Extinction debt in naturally contracting mountain

    E-Print Network [OSTI]

    of meadow habitat, resulting in an extinction debt. In contrast, abundance of herb-feeding moths and species conservation. Extinction debt refers to the number of extant specialist species of a habitat expected to become al. 2010; Bommarco et al. 2014). However, while some groups of species experience extinction debt

  12. Financing Solar PV at Government Sites with PPAs and Public Debt...

    Broader source: Energy.gov (indexed) [DOE]

    Solar PV at Government Sites with PPAs and Public Debt Overview of financing solar photovoltaics at government sties with power purchase agreements and public debt. Author:...

  13. Balancing biodiversity in a changing environment: extinction debt,

    E-Print Network [OSTI]

    Sax, Dov

    Balancing biodiversity in a changing environment: extinction debt, immigration credit and species Dynamics Species immigration and extinction are the dominant forces underlying changes in species diversity environmental change. The model incorporates lags in extinction and immigration, which lead to extinction debt

  14. The Cost of Debt Jules H. van Binsbergen

    E-Print Network [OSTI]

    § This version: January 2008 Abstract We estimate firm-specific cost of corporate debt functions for thousands of debt benefit curves. By integrating the area between the benefit and cost functions we estimate in capital structure policies by studying the signs of estimated slope coefficients for factors such as firm

  15. Numerical Methods for the Valuation of Synthetic Collateralized Debt Obligations

    E-Print Network [OSTI]

    Toronto, University of

    Numerical Methods for the Valuation of Synthetic Collateralized Debt Obligations by Xiaofang Ma Methods for the Valuation of Synthetic Collateralized Debt Obligations Xiaofang Ma Doctor of Philosophy methods for synthetic CDO valuation are presented. iii #12;Acknowledgements Although many people have

  16. The United States Agency for International Development as Catalyst for Debt-for-Nature Swaps

    E-Print Network [OSTI]

    Wilson, Scott

    1991-01-01T23:59:59.000Z

    in loss reserves against its LDC portfolio. In June 1989percent of their outstanding LDC debt. Id. at 1074. PACIFICsame tax advantage by donating the LDC debt directly to the

  17. Debt bad, surplus good, right? Not necessarily, economists say

    E-Print Network [OSTI]

    Belogay, Eugene A.

    something about it, government debt and deficit spending are not necessarily dirty words. "They allow us not a good thing," Emery said. In other words, having money lying around for a rainy day might work for a family. But having tax money lying around is not a popular way to do things in government because

  18. Statistical Mechanics of Money, Income, Debt, and Energy Consumption

    E-Print Network [OSTI]

    Hill, Wendell T.

    Statistical Mechanics of Money, Income, Debt, and Energy Consumption Physics Colloquium Presented in financial markets. Globally, data analysis of energy consumption per capita around the world shows@american.edu Similarly to the probability distribution of energy in physics, the probability distribution of money among

  19. LDC debt and policy linkages in the determination of world commodity prices

    E-Print Network [OSTI]

    Rausser, Gordon C.; Brazelon, Coleman

    1990-01-01T23:59:59.000Z

    and Performance Links Between LDC ,Debtors and Industrial ~Macro and Micro Policies on LDC Debtors: Commodity Price~ , WORKING PAPERNO. 538 LDC DEBT AND POLICY LINKAGES IN THE

  20. Armament remains from His Majesty's sloop Boscawen

    E-Print Network [OSTI]

    Carter, Brinnen Stiles

    1995-01-01T23:59:59.000Z

    His Majesty's Sloop Boscawen was built on Lake Champlain by British forces in 1759 as part of their successful campaign to drive the French Army from the Champlain Valley. This thesis describes and analyzes the armament remains found in and around...

  1. Coal remains a hot commodity for Australia

    SciTech Connect (OSTI)

    Bram, L.

    2006-02-15T23:59:59.000Z

    Based largely on analyses by the Australian Bureau of Agricultural and Resource Economics in late 2005 and early 2006, the article looks at the recent and near future export market for Australian coal. Demand in Asia is growing; European demand remains steady. Developments existing and new mines in Queensland are summarised in the article. 3 tabs.

  2. Weakly sufficient quantum statistics

    E-Print Network [OSTI]

    Katarzyna Lubnauer; Andrzej ?uczak; Hanna Pods?dkowska

    2009-11-23T23:59:59.000Z

    Some aspects of weak sufficiency of quantum statistics are investigated. In particular, we give necessary and sufficient conditions for the existence of a weakly sufficient statistic for a given family of vector states, investigate the problem of its minimality, and find the relation between weak sufficiency and other notions of sufficiency employed so far.

  3. Finance is just another word for other people's debts an interview with David Graeber

    E-Print Network [OSTI]

    Appel, HC

    2014-01-01T23:59:59.000Z

    an anthropologist. Notes 1. David Graeber, Debt: The FirstMelville House, 2011). 2. David Graeber, Direct Action: AnAK Press, 2009). 3. David Graeber, Toward an Anthropological

  4. Higgs Production via Gluon-Induced Weak Boson Fusion

    E-Print Network [OSTI]

    Jens Vollinga

    2008-09-22T23:59:59.000Z

    We present a calculation that allows for an estimation of the NNLO contributions to the Higgs production in the weak boson fusion channel. A possible deterioration of this important channel for the Higgs discoveries at the LHC can be ruled out by this calculation due to the small remaining cross section after the weak boson cuts.

  5. Current Understanding and Remaining Challenges in Modeling Long...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Understanding and Remaining Challenges in Modeling Long-Term Degradation of Borosilicate Nuclear Waste Glasses. Current Understanding and Remaining Challenges in Modeling...

  6. Quantum weak turbulence

    SciTech Connect (OSTI)

    Sanyal, Devashish [Department of Theoretical Physics, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032 (India)]. E-mail: tpds@mahendra.iacs.res.in; Sen, Siddhartha [School of Mathematics, Trinity College, Dublin 2 (Ireland)]. E-mail: sen@maths.tcd.ie

    2006-06-15T23:59:59.000Z

    The present manuscript dealing with large occupation of states of a quantum system, extends the study to the case of quantum weak turbulence. The quasiparticle spectrum, calculated for such a system, using a Green's function approach, establishes the dissipative and inertial regimes, hence a Kolmogorov type of picture.

  7. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. U.S. Commercial Banks And The Developing-Country Debt Crisi

    E-Print Network [OSTI]

    permission. U.S. Commercial Banks And The Developing-Country Debt Crisi Sachs, Jeffrey; Huizinga, Harry

  8. Debt servicing capacity of farmers in the blackland area of Texas

    E-Print Network [OSTI]

    Brandy, Othello Cecil

    1977-01-01T23:59:59.000Z

    DEBT SERVICING CAPACITY OF FARMERS IN THE BLACKLAND AREA OF TEXAS A Thesis by OTHELLO CECIL BRANDY Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SC I ENCE... August 1977 Major Subject: Agricultural Economics DEBT SERVICINB CAPACITY OF FARMERS IN THE BLACKLAND AREA OF T EXAS A The si s by OTHELLO CECIL BRANDY Approved as to style and content by: (Chairman of, mittee (Head of Department) Mem er Member...

  9. Weak Interaction and Cosmology

    E-Print Network [OSTI]

    P. R. Silva

    2008-04-16T23:59:59.000Z

    In this paper we examine the connection among the themes: the cosmological constant, the weak interaction and the neutrino mass. Our main propose is to review and modify the ideas first proposed by Hayakawa [ Prog. Theor. Phys.Suppl.,532(1965).], in the light of the new-fashioned features of contemporary physics. Assuming the pressure of a Fermi gas of neutrinos should be balanced by its gravitational attraction, we evaluate the mass of the background neutrino and its number.The neutrino mass here evaluated is compatible with the known value for the cosmological constant (or dark energy).Taking in account the role played by the weak forces experimented by the neutrinos, we also determined a value for the electroweak mixing angle. For sake of comparison, an alternative evaluation of the neutrino mass is also done.

  10. Debt Deflation: Can It Occur? Is It Dangerous? Not long after the U.S. economy exited the 2001 recession, a few pundits sounded the

    E-Print Network [OSTI]

    Ahmad, Sajjad

    Debt Deflation: Can It Occur? Is It Dangerous? Not long after the U.S. economy exited the 2001, a smaller group raises the specter of a debt deflation. What is debt deflation? Is it dangerous? What Is It not arrived, the inflation rate has fallen to within hailing distance of zero. Deflation produces dangerous

  11. Mining Weak Lensing Surveys

    E-Print Network [OSTI]

    N. Padmanabhan; U. Seljak; U. L. Pen

    2002-10-21T23:59:59.000Z

    We present a survey of the cosmological applications of the next generation of weak lensing surveys, paying special attention to the computational challenges presented by the number of galaxies, $N_{gal} ~$ 10$^{5}$. We focus on optimal methods with no pixelization and derive a multigrid $P^3M$ algorithm that performs the relevant computations in $O(N_{gal} \\log N_{gal})$ time. We test the algorithm by studying three applications of weak lensing surveys - convergence map reconstruction, cluster detection and $E$ and $B$ power spectrum estimation using realistic 1 deg^{2} simulations derived from N-body simulations. The map reconstruction is able to reconstruct large scale features without artifacts. Detecting clusters using only weak lensing is difficult because of line of sight contamination and noise, with low completeness if one desires low contamination of the sample. A power spectrum analysis of the convergence field is more promising and we are able to reconstruct the convergence spectrum with no loss of information down to the smallest scales. The numerical methods used here can be applied to other data sets with same $O(N\\log N)$ scaling and can be generalised to a sphere.

  12. Weak Interaction | Jefferson Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrincetonUsing Maps1DOETHE FUTURE LOOKSofthe Geeks: CelebratingWeak

  13. Constant Proportion Debt Obligations, Zeno's Paradox, and the Spectacular Financial Crisis of 2008

    E-Print Network [OSTI]

    Richards, Donald St. P.

    Constant Proportion Debt Obligations, Zeno's Paradox, and the Spectacular Financial Crisis of 2008-going worldwide financial crisis are heightened by the existence of other financial derivatives more arcane than, to the beat of his dying heart, The Devil drum on the darkened pane: "You did it, but was it Art?" ­ Rudyard

  14. Debt Composition and Balance Sheet Effect Of Currency Crisis in Indonesia1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Debt Composition and Balance Sheet Effect Of Currency Crisis in Indonesia1 Prepared by Agustinus condition in Indonesia. Therefore, even though currency depreciation is not related significantly to firm and Indonesia; despite some slowdown in growth in 1996, there was not a strong case that any of the countries

  15. Debt Capacity and Optimal Capital Structure for Privately-Financed Infrastructure Projects

    E-Print Network [OSTI]

    productivity, profitability, and private sector capital formation. He estimated, for example, that a 1 effective utilization of resources, when compared with the more flexible and cost conscious private sectorDebt Capacity and Optimal Capital Structure for Privately-Financed Infrastructure Projects

  16. International financial crises, term structure of foreign debt and monetary policy in open economies

    E-Print Network [OSTI]

    Caliskan, Ahmet

    2006-08-16T23:59:59.000Z

    ...................................................19 II.2.4.2 Assumption on R ..................................................20 II.3 Types of Equilibria.......................................................................20 II.3.1 Overview of Equilibria with No Crises... Short-term Debt Is More Expensive ( 120102 r )................................61 II.5.1.4 Summary of Vulnerability to Bank Runs.............62 II.5.2 When Do International Creditors Stop Lending to Domestic Banks...

  17. Forecasting Mexican imports of U.S. corn, sorghum and soybeans under free trade and debt reduction scenarios

    E-Print Network [OSTI]

    Lyford, Conrad Power

    1991-01-01T23:59:59.000Z

    INFORMATION Mexican External Debt and Structural Adjustment U. S. - Mexico Agricultural Trade Commodity Specific Factors LITERATURE REVIEW Economic Integration and the Welfare Impacts of a FTA Modeling Methods METHOD OF ANALYSIS AND DATA Description... BACKGROUND INFORMATION To analyze corn, sorghum and soybean trade it is useful to outline several background factors. First, Mexican external debt and its impact on U. S. -Mexican agricultural trade will be discussed. Second, U. S. -Mexican agricultural...

  18. A National Forum on Demand Response: Results on What Remains...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Forum on Demand Response: Results on What Remains to Be Done to Achieve Its Potential - Cost-Effectiveness Working Group A National Forum on Demand Response: Results on What...

  19. Software Verification for Weak Memory via Program Transformation

    E-Print Network [OSTI]

    Kröning, Daniel

    on a PowerPC cluster, due to the memory model. We study this bug in detail in Sec. 5. This observation handle the write atomicity relaxation of Power/ARM: generality remains a challenge. Since we want verification w.r.t. weak memory. We present experi- ments for a broad variety of models (from x86-TSO to Power

  20. Superfluid 4 He weak links

    E-Print Network [OSTI]

    Packard, Richard E.

    from the response of the cell to a step in the chemical potential difference across the array. When present a "Chemical potential battery" for superfluid 4He weak link cells, whereby a constant heater power in this dissertation represent a breakthrough in super- fluid 4He weak link research, and provide a big step

  1. Weak Measurements via Quantum Erasure

    E-Print Network [OSTI]

    Aharon Brodutch; Eliahu Cohen

    2014-09-04T23:59:59.000Z

    Weak measurement is increasingly acknowledged as an important theoretical and experimental tool. Until now however, it was not known how to perform an efficient weak non-local measurement of a general operator. We propose a novel scheme for performing non-local weak measurement which is based on the principle of quantum erasure. This method is then demonstrated within a few gedanken experiments, and also applied to the case of measuring sequential weak values. Comparison with other protocols for extracting non-local weak values offers several advantages of the suggested algorithm. In addition to the practical merits, this scheme sheds new light on fundamental topics such as causality, non-locality, measurement and uncertainty.

  2. Accomplishments and Remaining Challenges: THREDDS Data Server and

    E-Print Network [OSTI]

    Accomplishments and Remaining Challenges: THREDDS Data Server and Common Data Model Ethan Davis Unidata Policy Committee Meeting 23-24 May 2011 #12;THREDDS Data Server (TDS) · Web server for scientific;THREDDS Data Server (TDS) · ... · Data access services: ­ OPeNDAP ­ OGC WMS and WCS ­ NCSS · Data

  3. Reply to Davies: Hydraulic fracturing remains a possible mechanism for

    E-Print Network [OSTI]

    Jackson, Robert B.

    LETTER Reply to Davies: Hydraulic fracturing remains a possible mechanism for observed methane in aquifers overlying the Marcellus formation but asserts that we prematurely ascribed its cause to hydraulic mechanisms were leaky gas well casings and the possibility that hydraulic fracturing might generate new

  4. Geometry of Weak Stability Boundaries

    E-Print Network [OSTI]

    Edward Belbruno; Marian Gidea; Francesco Topputo

    2012-04-06T23:59:59.000Z

    The notion of a weak stability boundary has been successfully used to design low energy trajectories from the Earth to the Moon. The structure of this boundary has been investigated in a number of studies, where partial results have been obtained. We propose a generalization of the weak stability boundary. We prove analytically that, in the context of the planar circular restricted three-body problem, under certain conditions on the mass ratio of the primaries and on the energy, the weak stability boundary about the heavier primary coincides with a branch of the global stable manifold of the Lyapunov orbit about one of the Lagrange points.

  5. Metrization in weakly sequential spaces

    E-Print Network [OSTI]

    Emerson, Dominique Margaret

    1975-01-01T23:59:59.000Z

    METRIZATION IN WEAXLY SEQUENTIAL SPACES A Thesis by DOMINIQUE MARGARET EMERSON Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1975 Ma)or Sub...]ect: Mathematics METRIZATION IN WEAKLY SEQUENTIAL SPACES A Thesis by DOMINIQUE MARGARET EMERSON Approved as to style and content by: (Chairman of Committee) c-0 (Head of Department) ember) (Member) May 1975 ABSTRACT Metrization in Weakly Sequential...

  6. Weak Deeply Virtual Compton Scattering

    E-Print Network [OSTI]

    A. Psaker; W. Melnitchouk; A. V. Radyushkin

    2006-12-21T23:59:59.000Z

    We extend the analysis of the deeply virtual Compton scattering process to the weak interaction sector in the generalized Bjorken limit. The virtual Compton scattering amplitudes for the weak neutral and charged currents are calculated at the leading twist within the framework of the nonlocal light-cone expansion via coordinate space QCD string operators. Using a simple model, we estimate cross sections for neutrino scattering off the nucleon, relevant for future high intensity neutrino beam facilities.

  7. Weak Deeply Virtual Compton Scattering

    SciTech Connect (OSTI)

    Ales Psaker; Wolodymyr Melnitchouk; Anatoly Radyushkin

    2007-03-01T23:59:59.000Z

    We extend the analysis of the deeply virtual Compton scattering process to the weak interaction sector in the generalized Bjorken limit. The virtual Compton scattering amplitudes for the weak neutral and charged currents are calculated at the leading twist within the framework of the nonlocal light-cone expansion via coordinate space QCD string operators. Using a simple model, we estimate cross sections for neutrino scattering off the nucleon, relevant for future high intensity neutrino beam facilities.

  8. Thermal machines beyond the weak coupling regime

    E-Print Network [OSTI]

    R. Gallego; A. Riera; J. Eisert

    2014-11-13T23:59:59.000Z

    How much work can be extracted from a heat bath using a thermal machine? The study of this question has a very long tradition in statistical physics in the weak-coupling limit, applied to macroscopic systems. However, the assumption that thermal heat baths remain uncorrelated with physical systems at hand is less reasonable on the nano-scale and in the quantum setting. In this work, we establish a framework of work extraction in the presence of quantum correlations. We show in a mathematically rigorous and quantitative fashion that quantum correlations and entanglement emerge as a limitation to work extraction compared to what would be allowed by the second law of thermodynamics. At the heart of the approach are operations that capture naturally non-equilibrium dynamics encountered when putting physical systems into contact with each other. We discuss various limits that relate to known results and put our work into context of approaches to finite-time quantum thermodynamics.

  9. State tomography via weak measurements

    E-Print Network [OSTI]

    Shengjun Wu

    2013-02-01T23:59:59.000Z

    Recent work has revealed that the wave function of a pure state can be measured directly and that complementary knowledge of a quantum system can be obtained simultaneously by weak measurements. However, the original scheme applies only to pure states, and it is not efficient because most of the data are discarded by post-selection. Here, we propose tomography schemes for pure states and for mixed states via weak measurements, and our schemes are more efficient because we do not discard any data. Furthermore, we demonstrate that any matrix element of a general state can be directly read from an appropriate weak measurement. The density matrix (with all of its elements) represents all that is directly accessible from a general measurement.

  10. Cosmology and the weak interaction

    SciTech Connect (OSTI)

    Schramm, D.N. (Fermi National Accelerator Lab., Batavia, IL (USA)):(Chicago Univ., IL (USA))

    1989-12-01T23:59:59.000Z

    The weak interaction plays a critical role in modern Big Bang cosmology. This review will emphasize two of its most publicized cosmological connections: Big Bang nucleosynthesis and Dark Matter. The first of these is connected to the cosmological prediction of Neutrino Flavours, N{sub {nu}} {approximately} 3 which is now being confirmed at SLC and LEP. The second is interrelated to the whole problem of galaxy and structure formation in the universe. This review will demonstrate the role of the weak interaction both for dark matter candidates and for the problem of generating seeds to form structure. 87 refs., 3 figs., 5 tabs.

  11. Weak-Chaos Ratchet Accelerator

    E-Print Network [OSTI]

    Itzhack Dana; Vladislav B. Roitberg

    2012-05-28T23:59:59.000Z

    Classical Hamiltonian systems with a mixed phase space and some asymmetry may exhibit chaotic ratchet effects. The most significant such effect is a directed momentum current or acceleration. In known model systems, this effect may arise only for sufficiently strong chaos. In this paper, a Hamiltonian ratchet accelerator is introduced, featuring a momentum current for arbitrarily weak chaos. The system is a realistic, generalized kicked rotor and is exactly solvable to some extent, leading to analytical expressions for the momentum current. While this current arises also for relatively strong chaos, the maximal current is shown to occur, at least in one case, precisely in a limit of arbitrarily weak chaos.

  12. Weak Values and Relational Generalisations

    E-Print Network [OSTI]

    Thomas Marlow

    2006-04-20T23:59:59.000Z

    We justify generalisations of weak values from a tentatively relational perspective by deriving them from a generalisation of Bayes' rule. We also argue that these generalisations have implications of quantum nonlocality and may form a novel approach to quantum gravity and cosmology.

  13. Debt Optimization

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power Administration wouldDECOMPOSITION OFSupplementalC. L.Deadly CarcinogenDeborah S. Jin

  14. Coal: Long-term prospects remain very good

    SciTech Connect (OSTI)

    Doerell, P.E. [ed.

    1996-03-01T23:59:59.000Z

    Worldwide, it is the most economic and widespread fossil fuel available. The importance of coal will continue to grow to generate enough electricity to meet a rapidly increasing demand for energy. The first sign of a rising standard of living is access to a reliable and plentiful supply of electricity-and that means power generation from coal. The World Energy Conference in Tokyo last October called upon governments to {open_quotes}recognize that fossil fuels are likely to remain cost-competitive against alternatives over the next few decades and are set to play a greater and longer role than is widely thought.{close_quotes} Since coal, of all fossil fuels, has by far the most abundant reserves, this applies especially to coal. The International Energy Agency in Paris predicts a constant increase in the international hard-coal trade. While in 1973 (at the beginning of the first oil price crisis) only 8% of world hard coal produced was traded worldwide, this contribution increased to 11% by 1992 and may even grow to 16% between 1992 and 2010. Regarding volume, this would mean that the international hard-coal trade would more than double in the 18 years to 2010, i.e., from 403M to 852 M mt/yr. The 1995 update of the {open_quotes}Review of World Coal Trade,{close_quotes} published by the U.N. Economic Commission for Europe in Geneva, Switzerland, gives lower but still very considerable growth rate estimates: requirements from 3.508B (1990) to 3.982B mt (2010), production from 3.549B to 3994B mt, imports from 396M to 566M mt, and exports from 395M to 578M mt.

  15. Remaining-life estimation of boiler pressure parts

    SciTech Connect (OSTI)

    Borden, M.P.; Ellis, F.V. (ABB Combustion Engineering Systems, Chattanooga, TN (USA)); Miller, D.A.; Gladwin, D. (National Power, Leatherhead (UK))

    1991-02-01T23:59:59.000Z

    One of the objectives of this project was to determine the effect of prior creep damage on the remaining life of base material and HAZ material subjected to pure fatigue and creep fatigue loading. Life assessment techniques for cyclic loading conditions are required due to the need to two shifts (two shifts on, one shift off) or load-follow for conventional fossil power plant as new nuclear units become available. Described herein are the results of work undertaken at ABB Combustion Engineering Systems in the US and South Western Regional Scientific Services Department and Central Electricity Research Laboratories of the Central Electricity Generating Board in the UK. An interrupted creep testing program was conducted on a single heat of 1Cr--1/2Mo steel to produce creep damaged or pre-crept material for the pure fatigue and creep-fatigue test programs. Metallographic examination of the pre-crept material revealed the primary creep damage mechanism was thermal softening for the base material and creep cavitation for the HAZ material. Creep rupture properties were measured for the virgin, aged, and pre-crept materials at the creep-fatigue test temperature of 535{degree}C to aid in interpretation of the effect of prior creep on creep-fatigue life. Creep-fatigue life prediction was performed using the linear life fraction rule, stress based and strain-based life fraction approaches. The remanent creep-fatigue of the HAZ material can be predicted by conducting a linear summation of creep life fraction and creep-fatigue life fraction. This approach is not applicable for base material. The life fraction method of predicting the as-received creep-fatigue endurance data based on a ductility exhaustion approach gave better prediction than a stress based approach. The implications of the current project results are discussed in terms of developing an assessment procedure for determining the creep-fatigue life of elevated temperature components. 21 refs., 54 figs., 15 tabs.

  16. Weak values and weak coupling maximizing the output of weak measurements

    SciTech Connect (OSTI)

    Di Lorenzo, Antonio, E-mail: dilorenzo.antonio@gmail.com

    2014-06-15T23:59:59.000Z

    In a weak measurement, the average output ?o? of a probe that measures an observable A{sup -hat} of a quantum system undergoing both a preparation in a state ?{sub i} and a postselection in a state E{sub f} is, to a good approximation, a function of the weak value A{sub w}=Tr[E{sub f}A{sup -hat} ?{sub i}]/Tr[E{sub f}?{sub i}], a complex number. For a fixed coupling ?, when the overlap Tr[E{sub f}?{sub i}] is very small, A{sub w} diverges, but ?o? stays finite, often tending to zero for symmetry reasons. This paper answers the questions: what is the weak value that maximizes the output for a fixed coupling? What is the coupling that maximizes the output for a fixed weak value? We derive equations for the optimal values of A{sub w} and ?, and provide the solutions. The results are independent of the dimensionality of the system, and they apply to a probe having a Hilbert space of arbitrary dimension. Using the Schrödinger–Robertson uncertainty relation, we demonstrate that, in an important case, the amplification ?o? cannot exceed the initial uncertainty ?{sub o} in the observable o{sup -hat}, we provide an upper limit for the more general case, and a strategy to obtain ?o???{sub o}. - Highlights: •We have provided a general framework to find the extremal values of a weak measurement. •We have derived the location of the extremal values in terms of preparation and postselection. •We have devised a maximization strategy going beyond the limit of the Schrödinger–Robertson relation.

  17. Global Superdiffusion of Weak Chaos

    E-Print Network [OSTI]

    Itzhack Dana

    2003-10-20T23:59:59.000Z

    A class of kicked rotors is introduced, exhibiting accelerator-mode islands (AIs) and {\\em global} superdiffusion for {\\em arbitrarily weak} chaos. The corresponding standard maps are shown to be exactly related to generalized web maps taken modulo an ``oblique cylinder''. Then, in a case that the web-map orbit structure is periodic in the phase plane, the AIs are essentially {\\em normal} web islands folded back into the cylinder. As a consequence, chaotic orbits sticking around the AI boundary are accelerated {\\em only} when they traverse tiny {\\em ``acceleration spots''}. This leads to chaotic flights having a quasiregular {\\em steplike} structure. The global weak-chaos superdiffusion is thus basically different in nature from the strong-chaos one in the usual standard and web maps.

  18. Metrization in weakly sequential spaces 

    E-Print Network [OSTI]

    Emerson, Dominique Margaret

    1975-01-01T23:59:59.000Z

    * dt f th ~ A t N h tf 1 ~Sit. of weakly sequential spaces along with that of cs-hereditarily closure-preserving families, the author has characterized metri- zability in spaces where sequences suffice. Chapter II contains the definitions of locally... Dugund]i [5]. One deviation from this convention is the use of the symbol "clX(A)" to denote the closure in the space X of a set A. The subscript "X" will be deleted when no confusion will arise. The letters Z and N will denote the set of integers...

  19. Non-representative quantum mechanical weak values

    E-Print Network [OSTI]

    B. E. Y. Svensson

    2015-03-06T23:59:59.000Z

    The operational definition of a weak value for a quantum mechanical system involves the limit of the weak measurement strength tending to zero. I study how this limit compares to the situation for the undisturbed (no weak measurement) system. Under certain conditions, which I investigate, this limit is discontinuous in the sense that it does not merge smoothly to the Hilbert space description of the undisturbed system. Hence, in these discontinuous cases, the weak value does not represent the undisturbed system. As a result, conclusions drawn from such weak values regarding the properties of the studied system cannot be upheld. Examples are given.

  20. Weak Boson Emission in Hadron Collider Processes

    E-Print Network [OSTI]

    U. Baur

    2006-11-17T23:59:59.000Z

    The O(alpha) virtual weak radiative corrections to many hadron collider processes are known to become large and negative at high energies, due to the appearance of Sudakov-like logarithms. At the same order in perturbation theory, weak boson emission diagrams contribute. Since the W and Z bosons are massive, the O(alpha) virtual weak radiative corrections and the contributions from weak boson emission are separately finite. Thus, unlike in QED or QCD calculations, there is no technical reason for including gauge boson emission diagrams in calculations of electroweak radiative corrections. In most calculations of the O(alpha) electroweak radiative corrections, weak boson emission diagrams are therefore not taken into account. Another reason for not including these diagrams is that they lead to final states which differ from that of the original process. However, in experiment, one usually considers partially inclusive final states. Weak boson emission diagrams thus should be included in calculations of electroweak radiative corrections. In this paper, I examine the role of weak boson emission in those processes at the Fermilab Tevatron and the CERN LHC for which the one-loop electroweak radiative corrections are known to become large at high energies (inclusive jet, isolated photon, Z+1 jet, Drell-Yan, di-boson, t-bar t, and single top production). In general, I find that the cross section for weak boson emission is substantial at high energies and that weak boson emission and the O(alpha) virtual weak radiative corrections partially cancel.

  1. Weak measurement and control of entanglement generation

    E-Print Network [OSTI]

    Charles D. Hill; J. F. Ralph

    2008-01-28T23:59:59.000Z

    In this paper we show how weak joint measurement and local feedback can be used to control entanglement generation between two qubits. To do this, we make use of a decoherence free subspace (DFS). Weak measurement and feedback can be used to drive the system into this subspace rapidly. Once within the subspace, feedback can generate entanglement rapidly, or turn off entanglement generation dynamically. We also consider, in the context of weak measurement, some of differences between purification and generating entanglement.

  2. The coexistence and evolution of attractors in the web map with weak dissipation

    E-Print Network [OSTI]

    A. V. Savin; D. V. Savin

    2013-02-21T23:59:59.000Z

    The dynamics of the web map with weak linear dissipation is studied. The evolution of the coexisting attractors and the structure of their basins while changing the dissipation and nonlinearity are revealed. It is shown that the structure of the basins remains the same when the dissipation and nonlinearity changes simultaneously.

  3. untied as long as the magnetization remains smooth and finite. Skyrmions are therefore

    E-Print Network [OSTI]

    Blaustein, Andrew R.

    neutron-scattering experiments and related theoretical work that established that lattices of skyrmions of a weak mag- netic field4,5 . But because neutron scattering can detect only periodic structures

  4. An analysis of the effects of farm size and tenure upon debt repayment capacity of farmers in the Coastal Bend Area of Texas

    E-Print Network [OSTI]

    Rahman, Md. Lutfor

    1966-01-01T23:59:59.000Z

    AN ANALYSIS OF THE EFFECTS OF FARM SIZE AND ~ UPON DEBT REPAYMENT CAPACITY OF FAHMEM IN THE COASTAL REND AREA OF ~ A Thesis by MD. LUTFOR RAHMAE Submitted to the Graduate College of the Texas AM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1966 Major Subject: Agricultural Economics AN ANALYSIS OF THE EFFECTS OF FARM SIZE AND TENURE% UPON DEBT REPA~ CAPACITY OF FARMERS IN THE COASTAL BEND AREA OF ~ A Thesis by MD. LUTFOR RAHMAN...

  5. Can the trace formula describe weak localisation?

    E-Print Network [OSTI]

    Robert S. Whitney; Igor V. Lerner; Robert A. Smith

    1999-02-24T23:59:59.000Z

    We attempt to systematically derive perturbative quantum corrections to the Berry diagonal approximation of the two-level correlation function (TLCF) for chaotic systems. To this end, we develop a ``weak diagonal approximation'' based on a recent description of the first weak localisation correction to conductance in terms of the Gutzwiller trace formula. This semiclassical method is tested by using it to derive the weak localisation corrections to the TLCF for a semiclassically disordered system. Unfortunately the method is unable to correctly reproduce the ``Hikami boxes'' (the relatively small regions where classical paths are glued together by quantum processes). This results in the method failing to reproduce the well known weak localisation expansion. It so happens that for the first order correction it merely produces the wrong prefactor. However for the second order correction, it is unable to reproduce certain contributions, and leads to a result which is of a different form to the standard one.

  6. acromegaly remains under-recognized: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    bees 144 Voices from the Small Cinemas: Beyond the Remaining Countries University of Kansas - KU ScholarWorks Summary: This introduction to a special volume dedicated to...

  7. Decontamination and Management of Human Remains Following Incidents of Hazardous Chemical Release

    SciTech Connect (OSTI)

    Hauschild, Veronique [U.S. Army Public Health Command; Watson, Annetta Paule [ORNL; Bock, Robert Eldon [ORNL

    2012-01-01T23:59:59.000Z

    Abstract Objective: To provide specific procedural guidance and resources for identification, assessment, control, and mitigation of compounds that may contaminate human remains resulting from chemical attack or release. Design: A detailed technical, policy, and regulatory review is summarized. Setting: Guidance is suitable for civilian or military settings where human remains potentially contaminated with hazardous chemicals may be present. Settings would include sites of transportation accidents, natural disasters, terrorist or military operations, mortuary affairs or medical examiner processing and decontamination points, and similar. Patients, Participants: While recommended procedures have not been validated with actual human remains, guidance has been developed from data characterizing controlled experiments with fabrics, materiel, and laboratory animals. Main Outcome Measure(s): Presentation of logic and specific procedures for remains management, protection and decontamination of mortuary affairs personnel, as well as decision criteria for determining when remains are sufficiently decontaminated so as to pose no chemical health hazard. Results: Established procedures and existing equipment/materiel available for decontamination and verification provide appropriate and reasonable means to mitigate chemical hazards from remains. Extensive characterization of issues related to remains decontamination indicates that supra-lethal concentrations of liquid chemical warfare agent VX may prove difficult to decontaminate and verify in a timely fashion. Specialized personnel can and should be called upon to assist with monitoring necessary to clear decontaminated remains for transport and processing. Conclusions: Once appropriate decontamination and verification have been accomplished, normal procedures for remains processing and transport to the decedent s family and the continental United States can be followed.

  8. Abundances of metal-weak thick-disc candidates

    E-Print Network [OSTI]

    P. Bonifacio; M. Centurion; P. Molaro

    1999-06-03T23:59:59.000Z

    High resolution spectra of 5 candidate metal-weak thick-disc stars suggested by Beers & Sommer-Larsen (1995) are analyzed to determine their chemical abundances. The low abundance of all the objects has been confirmed with metallicity reaching [Fe/H]=-2.9. However, for three objects, the astrometric data from the Hipparcos catalogue suggests they are true halo members. The remaining two, for which proper-motion data are not available, may have disc-like kinematics. It is therefore clear that it is useful to address properties of putative metal-weak thick-disc stars only if they possess full kinematic data. For CS 22894-19 the abundance pattern similar to those of typical halo stars is found, suggesting that chemical composition is not a useful discriminant between thick-disc and halo stars. CS 29529-12 is found to be C enhanced with [C/Fe]=+1.0; other chemical peculiarities involve the s process elements: [Sr/Fe]=-0.65 and [Ba/Fe]=+0.62, leading to a high [Ba/Sr] considerably larger than what is found in more metal-rich carbon-rich stars, but similar to LP 706-7 and LP 625-44 discussed by Norris et al (1997a). Hipparcos data have been used to calculate the space velocities of 25 candidate metal-weak thick-disc stars, thus allowing us to identify 3 bona fide members, which support the existence of a metal-poor tail of the thick-disc, at variance with a claim to the contrary by Ryan & Lambert (1995).

  9. T-705: Linux Kernel Weakness in Sequence Number Generation Facilitates...

    Broader source: Energy.gov (indexed) [DOE]

    5: Linux Kernel Weakness in Sequence Number Generation Facilitates Packet Injection Attacks T-705: Linux Kernel Weakness in Sequence Number Generation Facilitates Packet Injection...

  10. T-728: Apache Tomcat HTTP DIGEST Authentication Weaknesses Let...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    8: Apache Tomcat HTTP DIGEST Authentication Weaknesses Let Remote Users Conduct Bypass Attacks T-728: Apache Tomcat HTTP DIGEST Authentication Weaknesses Let Remote Users Conduct...

  11. Contribution of muscular weakness to osteoporosis: Computational and animal models

    E-Print Network [OSTI]

    Gefen, Amit

    Contribution of muscular weakness to osteoporosis: Computational and animal models M. Be obtained herein indicate that muscular weakness may be an important factor contributing to osteoporosis. Ó

  12. Theory and Modeling of Weakly Bound/Physisorbed Materials for...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Theory and Modeling of Weakly BoundPhysisorbed Materials for Hydrogen Storage Theory and Modeling of Weakly BoundPhysisorbed Materials for Hydrogen Storage Presentation on the...

  13. An Analytical Model for Predicting the Remaining Battery Capacity of Lithium-Ion Batteries

    E-Print Network [OSTI]

    Pedram, Massoud

    An Analytical Model for Predicting the Remaining Battery Capacity of Lithium-Ion Batteries Peng cycle-life tends to shrink significantly. The capacities of commercial lithium-ion batteries fade by 10 prediction model to estimate the remaining capacity of a Lithium-Ion battery. The proposed analytical model

  14. PREDICTION OF REMAINING LIFE OF POWER TRANSFORMERS BASED ON LEFT TRUNCATED AND RIGHT

    E-Print Network [OSTI]

    PREDICTION OF REMAINING LIFE OF POWER TRANSFORMERS BASED ON LEFT TRUNCATED AND RIGHT CENSORED of the remaining life of high-voltage power transform- ers is an important issue for energy companies because of the need for planning maintenance and capital expenditures. Lifetime data for such transformers

  15. Fish remains (Elasmobranchii, Actinopterygii) from the Late Cretaceous of1 the Benue Trough, Nigeria2

    E-Print Network [OSTI]

    Fish remains (Elasmobranchii, Actinopterygii) from the Late Cretaceous of1 the Benue Trough address: romain.vullo@univ-rennes1.fr9 10 Abstract11 Selachian and ray-finned fish remains from various Cenomanian­early Turonian and25 Maastrichtian) created opportunities for the dispersal of many marine fish

  16. Strong effects in weak nonleptonic decays

    SciTech Connect (OSTI)

    Wise, M.B.

    1980-04-01T23:59:59.000Z

    In this report the weak nonleptonic decays of kaons and hyperons are examined with the hope of gaining insight into a recently proposed mechanism for the ..delta..I = 1/2 rule. The effective Hamiltonian for ..delta..S = 1 weak nonleptonic decays and that for K/sup 0/-anti K/sup 0/ mixing are calculated in the six-quark model using the leading logarithmic approximation. These are used to examine the CP violation parameters of the kaon system. It is found that if Penguin-type diagrams make important contributions to K ..-->.. ..pi pi.. decay amplitudes then upcoming experiments may be able to distinguish the six-quark model for CP violation from the superweak model. The weak radiative decays of hyperons are discussed with an emphasis on what they can teach us about hyperon nonleptonic decays and the ..delta..I = 1/2 rule.

  17. No-Hair Theorem for Weak Pulsar

    E-Print Network [OSTI]

    Gruzinov, Andrei

    2015-01-01T23:59:59.000Z

    It is proposed that there exists a class of pulsars, called weak pulsars, for which the large-scale magnetosphere, and hence the gamma-ray emission, are independent of the detailed pattern of plasma production. The weak pulsar magnetosphere and its gamma-ray emission are uniquely determined by just three parameters: spin, dipole, and the spin-dipole angle. We calculate this supposedly unique pulsar magnetosphere in the axisymmetric case. The magnetosphere is found to be very close to (although interestingly not fully identical with) the magnetosphere we have previously calculated, explaining the phenomenological success of the old calculation. We offer only a highly tentative proof of this "Pulsar No-Hair Theorem". Our analytics, while convincing in its non-triviality, is incomplete, and counts only as a plausibility argument. Our numerics, while complete, is dubious. The plasma flow in the weak pulsar magnetosphere turns out to be even more intricate than what we have previously proposed: some particles, aft...

  18. Crossover between weak localization and weak antilocalization in magnetically doped topological insulator

    E-Print Network [OSTI]

    Wang, Wei Hua

    ;Topological insulators (TI) are a new class of quantum materials with insulating bulk enclosedCrossover between weak localization and weak antilocalization in magnetically doped topological insulator Minhao Liu1,* , Jinsong Zhang1,* , Cui-Zu Chang1,2,* , Zuocheng Zhang1 , Xiao Feng2 , Kang Li2

  19. Hall Magnetohydrodynamics of weakly-ionized plasma

    E-Print Network [OSTI]

    B. P. Pandey; Mark Wardle

    2006-08-02T23:59:59.000Z

    We show that the Hall scale in a weakly ionized plasma depends on the fractional ionization of the medium and, Hall MHD description becomes important whenever the ion-neutral collision frequency is comparable to the ion-gyration frequency, or, the ion-neutral collisional mean free path is smaller than the ion gyro-radius. Wave properties of a weakly-ionized plasma also depends on the fractional ionization and plasma Hall parameters, and whistler mode is the most dominant mode in such a medium. Thus Hall MHD description will be important in astrophysical disks, dark molecular clouds, neutron star crusts, and, solar and planetary atmosphere.

  20. Weak Lensing: Dark Matter, Dark Energy

    SciTech Connect (OSTI)

    Jain, Bhuvnesh (University of Pennsylvania) [University of Pennsylvania

    2006-02-27T23:59:59.000Z

    The light rays from distant galaxies are deflected by massive structures along the line of sight, causing the galaxy images to be distorted. Measurements of these distortions, known as weak lensing, provide a way of measuring the distribution of dark matter as well as the spatial geometry of the universe. I will describe the ideas underlying this approach to cosmology. With planned large imaging surveys, weak lensing is a powerful probe of dark energy. I will discuss the observational challenges ahead and recent progress in developing multiple, complementary approaches to lensing measurements.

  1. Weak Gravity Conjecture for Noncommutative Field Theory

    E-Print Network [OSTI]

    Qing-Guo Huang; Jian-Huang She

    2006-11-20T23:59:59.000Z

    We investigate the weak gravity bounds on the U(1) gauge theory and scalar field theories in various dimensional noncommutative space. Many results are obtained, such as the upper bound on the noncommutative scale $g_{YM}M_p$ for four dimensional noncommutative U(1) gauge theory. We also discuss the weak gravity bounds on their commutative counterparts. For example, our result on 4 dimensional noncommutative U(1) gauge theory reduces in certain limit to its commutative counterpart suggested by Arkani-Hamed et.al at least at tree-level.

  2. Theoretical treatments of fusion processes in collisions of weakly bound nuclei

    E-Print Network [OSTI]

    L. F. Canto; R. Donangelo; M. S. Hussein

    2007-04-17T23:59:59.000Z

    We review the theoretical methods to evaluate fusion cross sections in collisions of weakly bound nuclei. We piont out that in such collisions the coupling to the breakup channel leads to the appearance of different fusion processes. The extentsion of the coupled-channel method to coupling with the continuum is the most successful treatment for these collisions. However, evaluating separate cross section for each fusion process remains a very hard task.

  3. Products, weak topologies, quotients and strong topologies.

    E-Print Network [OSTI]

    Ferri, Stefano

    Products, weak topologies, quotients and strong topologies. Stefano Ferri Abstract Again something from finite products of metric spaces, which are well known from the course Analysis I. Given two metric spaces (X, d) and (Y, ) we define the product space X Ã? Y in the following way. As a set we have

  4. Current Size and Remaining Market Potential of the U.S. Energy Service Company Industry

    Broader source: Energy.gov [DOE]

    "This report contains information on Current Size and Remaining Market Potential of the U.S. Energy Service Company Industry, prepared for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy, Weatherization and Intergovernmental Program."

  5. Comparative analysis of remaining oil saturation in waterflood patterns based on analytical modeling and simulation 

    E-Print Network [OSTI]

    Azimov, Anar Etibar

    2006-08-16T23:59:59.000Z

    In assessing the economic viability of a waterflood project, a key parameter is the remaining oil saturation (ROS) within each pattern unit. This information helps in identifying the areas with the highest ROS and thus ...

  6. Taphonomy of the faunal remains of a rural roman farmsite, San Giovanni di Ruoti, Italy

    E-Print Network [OSTI]

    Hunter, Cristi Assad

    1986-01-01T23:59:59.000Z

    Hunter, B. A. , California State University at Sacramento Chairman of Advisory Committee: Dr. D. Gentry Steele The faunal remains from a rural Roman farmsite, San Giovanni di Ruoti, Italy, were used to perform a taphonomic analysis. The goal... remains. The taphonomic analysis included examination of the pig skeletal element representation, identification of the specific agents that modify bone, identification of the butchering techniques used at the site, and documentation of possible...

  7. From weak discontinuities to nondissipative shock waves

    SciTech Connect (OSTI)

    Garifullin, R. N., E-mail: rustem@matem.anrb.ru; Suleimanov, B. I., E-mail: bisul@mail.r [Ufa Scientific Center, Russian Academy of Sciences, Institute of Mathematics with Computing Center (Russian Federation)

    2010-01-15T23:59:59.000Z

    An analysis is presented of the effect of weak dispersion on transitions from weak to strong discontinuities in inviscid fluid dynamics. In the neighborhoods of transition points, this effect is described by simultaneous solutions to the Korteweg-de Vries equation u{sub t}'+ uu{sub x}' + u{sub xxx}' = 0 and fifth-order nonautonomous ordinary differential equations. As x{sup 2} + t{sup 2} {yields}{infinity}, the asymptotic behavior of these simultaneous solutions in the zone of undamped oscillations is given by quasi-simple wave solutions to Whitham equations of the form r{sub i}(t, x) = tl{sub i} x/t{sup 2}.

  8. The strict-weak lattice polymer

    E-Print Network [OSTI]

    Ivan Corwin; Timo Seppäläinen; Hao Shen

    2015-07-06T23:59:59.000Z

    We introduce the strict-weak polymer model, and show the KPZ universality of the free energy fluctuation of this model for a certain range of parameters. Our proof relies on the observation that the discrete time geometric q-TASEP model, studied earlier by A. Borodin and I. Corwin, scales to this polymer model in the limit q->1. This allows us to exploit the exact results for geometric q-TASEP to derive a Fredholm determinant formula for the strict-weak polymer, and in turn perform rigorous asymptotic analysis to show KPZ scaling and GUE Tracy-Widom limit for the free energy fluctuations. We also derive moments formulae for the polymer partition function directly by Bethe ansatz, and identify the limit of the free energy using a stationary version of the polymer model.

  9. The strict-weak lattice polymer

    E-Print Network [OSTI]

    Ivan Corwin; Timo Seppäläinen; Hao Shen

    2014-09-05T23:59:59.000Z

    We introduce the strict-weak polymer model, and show the KPZ universality of the free energy fluctuation of this model for a certain range of parameters. Our proof relies on the observation that the discrete time geometric q-TASEP model, studied earlier by A. Borodin and I. Corwin, scales to this polymer model in the limit q->1. This allows us to exploit the exact results for geometric q-TASEP to derive a Fredholm determinant formula for the strict-weak polymer, and in turn perform rigorous asymptotic analysis to show KPZ scaling and GUE Tracy-Widom limit for the free energy fluctuations. We also derive moments formulae for the polymer partition function directly by Bethe ansatz, and identify the limit of the free energy using a stationary version of the polymer model.

  10. Spectral statistics for weakly correlated random potentials

    E-Print Network [OSTI]

    Frédéric Klopp

    2012-10-29T23:59:59.000Z

    We study localization and derive stochastic estimates (in particular, Wegner and Minami estimates) for the eigenvalues of weakly correlated random discrete Schr\\"odinger operators in the localized phase. We apply these results to obtain spectral statistics for general discrete alloy type models where the single site perturbation is neither of finite rank nor of fixed sign. In particular, for the models under study, the random potential exhibits correlations at any range.

  11. Quantal Definition of the Weak Equivalence Principle

    E-Print Network [OSTI]

    Abel Camacho; Arturo Camacho-Guardian

    2008-11-03T23:59:59.000Z

    The present work analyzes the meaning of the Weak Equivalence Principle in the context of quantum mechanics. A quantal definition for this principle is introduced. This definition does not require the concept of trajectory and relies upon the phase shift induced by a gravitational field in the context of a quantum interference experiment of two coherent beams of particles. In other words, it resorts to wave properties of the system and not to classical concepts as the idea of trajectory.

  12. Heating Cooling Flows with Weak Shock Waves

    E-Print Network [OSTI]

    W. G. Mathews; A. Faltenbacher; F. Brighenti

    2005-11-05T23:59:59.000Z

    The discovery of extended, approximately spherical weak shock waves in the hot intercluster gas in Perseus and Virgo has precipitated the notion that these waves may be the primary heating process that explains why so little gas cools to low temperatures. This type of heating has received additional support from recent gasdynamical models. We show here that outward propagating, dissipating waves deposit most of their energy near the center of the cluster atmosphere. Consequently, if the gas is heated by (intermittent) weak shocks for several Gyrs, the gas within 30-50 kpc is heated to temperatures that far exceed observed values. This heating can be avoided if dissipating shocks are sufficiently infrequent or weak so as not to be the primary source of global heating. Local PV and viscous heating associated with newly formed X-ray cavities are likely to be small, which is consistent with the low gas temperatures generally observed near the centers of groups and clusters where the cavities are located.

  13. $D^+ \\to K^- ?^+ ?^+$ - the weak vector current

    E-Print Network [OSTI]

    P. C. Magalhães; M. R. Robilotta

    2015-04-23T23:59:59.000Z

    Studies of D and B mesons decays into hadrons have been used to test the standard model in the last fifteen years. A heavy meson decay involves the combined effects of a primary weak vertex and subsequent hadronic final state interactions, which determine the shapes of Dalitz plots. The fact that final products involve light mesons indicates that the QCD vacuum is an active part of the problem. This makes the description of these processes rather involved and, in spite of its importance, phenomenological analyses tend to rely on crude models. Our group produced, some time ago, a schematic calculation of the decay $D^+ \\to K^- \\pi^+ \\pi^+$, which provided a reasonable description of data. Its main assumption was the dominance of the weak vector-current, which yields a non-factorizable interaction. Here we refine that calculation by including the correct momentum dependence of the weak vertex and extending the energy ranges of $\\pi\\pi$ and $K\\pi$ subamplitudes present into the problem. These new features make the present treatment more realistic and bring theory closer to data.

  14. Material Aging and Degradation Detection and Remaining Life Assessment for Plant Life Management

    SciTech Connect (OSTI)

    Ramuhalli, Pradeep; Henager, Charles H.; Griffin, Jeffrey W.; Meyer, Ryan M.; Coble, Jamie B.; Pitman, Stan G.; Bond, Leonard J.

    2012-12-31T23:59:59.000Z

    One of the major factors that may impact long term operations is structural material degradation, Detecting materials degradation, estimating the remaining useful life (RUL) of the component, and determining approaches to mitigating the degradation are important from the perspective of long term operations. In this study, multiple nondestructive measurement and monitoring methods were evaluated for their ability to assess the material degradation state. Metrics quantifying the level of damage from these measurements were defined, and evaluated for their ability to provide estimates of remaining life of the component. An example of estimating the RUL from nondestructive measurements of material degradation condition is provided.

  15. Power Outage 1. Remain Calm; provide assistance to others if necessary.

    E-Print Network [OSTI]

    Hickman, Mark

    Power Outage 1. Remain Calm; provide assistance to others if necessary. 2. Report the outage, call. Campus-wide telephone communications will continue to operate during a power outage on standard phones. If emergency assistance is required, call UC Security on Extn 6111 and state "POWEr OUTAgE" or mobile 0800 823

  16. Prostate cancer remains the most common cancer in men in the United States, with an

    E-Print Network [OSTI]

    Cai, Long

    Prostate cancer remains the most common cancer in men in the United States, with an estimated of death from cancer in men, with 33,720 estimated deaths (11% of all estimated deaths) in 2011 (REF. 1-year relative survival rate is essentially 100% based on 2001­2007 statistics2 . However, for patients

  17. A Bayesian Prognostic Algorithm for Assessing Remaining Useful Life of Nuclear Power Components

    SciTech Connect (OSTI)

    Ramuhalli, Pradeep; Bond, Leonard J.; Griffin, Jeffrey W.; Dixit, Mukul; Henager, Charles H.

    2010-12-01T23:59:59.000Z

    A central issue in life extension for the current fleet of light water nuclear power reactors is the early detection and monitoring of significant materials degradation. To meet this need nondestructive measurement methods that are suitable for on-line, continuous, in-plant monitoring over extended time periods (months to years) are needed. A related issue is then, based on a condition assessment or degradation trend, to have the ability to estimate the remaining useful life based of components, structures and systems based on the available materials degradation information. Such measurement and modeling methods form the basis for a new range of advanced diagnostic and prognostic approaches. Prognostic methods that predict remaining life based on large crack growth, and phenomena that can be described by linear elastic fracture mechanics, have been reported by several researchers. The challenge of predicting remaining life for earlier phases of degradation is largely unsolved. Monitoring for early detection of materials degradation requires novel and enhanced sensors and data integration techniques. A recent review has considered the stages of degradation and sensing methods that can potentially be employed to detect and monitor early degradation for nuclear power plant applications. An experimental assessment of selected diagnostic techniques was also reported recently. However, the estimation of remaining useful life (RUL) determined from nondestructive diagnostic measurements for early degradation is still an unsolved problem. This present paper will discuss the application of Bayesian prognostic algorithms applied to the early degradation- life problem.

  18. `TVLSI-00029-2003.R1 An Analytical Model for Predicting the Remaining Battery

    E-Print Network [OSTI]

    Pedram, Massoud

    . Reference [7] studied the battery discharge efficiency under different loading conditions and approximated`TVLSI-00029-2003.R1 1 An Analytical Model for Predicting the Remaining Battery Capacity of Lithium-Ion Batteries Peng Rong, Student Member, IEEE and Massoud Pedram, Fellow, IEEE Abstract -- Predicting

  19. Grantee Performance Required to Release the Hold on Remaining 50% of Obligated Recovery Act Funds

    Broader source: Energy.gov [DOE]

    U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) Weatherization Assistance Program Notice 10-05 deals with performance requirements for program grantees?states and U.S. territories?to receive the remaining 50% of obligated funds under the 2009 American Reinvestment and Recovery Act.

  20. Shoring up Infrastructure Weaknesses with Hybrid Cloud Storage

    E-Print Network [OSTI]

    Chaudhuri, Surajit

    Shoring up Infrastructure Weaknesses with Hybrid Cloud Storage #12;2StorSimple White Pages: Shoring Up Infrastructure Weaknesses with Hybrid Cloud Storage Table of Contents The Hybrid Cloud Context for IT Managers ............................................................. 3 The Bottleneck of Managing Storage

  1. Wave turbulent statistics in non-weak wave turbulence

    E-Print Network [OSTI]

    Naoto Yokoyama

    2011-05-08T23:59:59.000Z

    In wave turbulence, it has been believed that statistical properties are well described by the weak turbulence theory, in which nonlinear interactions among wavenumbers are assumed to be small. In the weak turbulence theory, separation of linear and nonlinear time scales derived from the weak nonlinearity is also assumed. However, the separation of the time scales is often violated even in weak turbulent systems where the nonlinear interactions are actually weak. To get rid of this inconsistency, closed equations are derived without assuming the separation of the time scales in accordance with Direct-Interaction Approximation (DIA), which has been successfully applied to Navier--Stokes turbulence. The kinetic equation of the weak turbulence theory is recovered from the DIA equations if the weak nonlinearity is assumed as an additional assumption. It suggests that the DIA equations is a natural extension of the conventional kinetic equation to not-necessarily-weak wave turbulence.

  2. analysis identifies weak: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    parameter estimation via weak lensing, with an emphasis on the equation of state of dark energy. P. G. Castro; A. F. Heavens; T. D. Kitching 2005-07-20 5 Composite Weak...

  3. Spurious Shear in Weak Lensing with LSST

    SciTech Connect (OSTI)

    Chang, C.; Kahn, S.M.; Jernigan, J.G.; Peterson, J.R.; AlSayyad, Y.; Ahmad, Z.; Bankert, J.; Bard, D.; Connolly, A.; Gibson, R.R.; Gilmore, K.; Grace, E.; Hannel, M.; Hodge, M.A.; Jee, M.J.; Jones, L.; Krughoff, S.; Lorenz, S.; Marshall, P.J.; Marshall, S.; Meert, A.

    2012-09-19T23:59:59.000Z

    The complete 10-year survey from the Large Synoptic Survey Telescope (LSST) will image {approx} 20,000 square degrees of sky in six filter bands every few nights, bringing the final survey depth to r {approx} 27.5, with over 4 billion well measured galaxies. To take full advantage of this unprecedented statistical power, the systematic errors associated with weak lensing measurements need to be controlled to a level similar to the statistical errors. This work is the first attempt to quantitatively estimate the absolute level and statistical properties of the systematic errors on weak lensing shear measurements due to the most important physical effects in the LSST system via high fidelity ray-tracing simulations. We identify and isolate the different sources of algorithm-independent, additive systematic errors on shear measurements for LSST and predict their impact on the final cosmic shear measurements using conventional weak lensing analysis techniques. We find that the main source of the errors comes from an inability to adequately characterise the atmospheric point spread function (PSF) due to its high frequency spatial variation on angular scales smaller than {approx} 10{prime} in the single short exposures, which propagates into a spurious shear correlation function at the 10{sup -4}-10{sup -3} level on these scales. With the large multi-epoch dataset that will be acquired by LSST, the stochastic errors average out, bringing the final spurious shear correlation function to a level very close to the statistical errors. Our results imply that the cosmological constraints from LSST will not be severely limited by these algorithm-independent, additive systematic effects.

  4. Lossy compression of weak lensing data

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Vanderveld, R Ali [Chicago U., EFI; Caltech /Caltech, JPL; Bernstein, Gary M [Pennsylvania U.; Stoughton, Chris [Fermilab; Rhodes, Jason [Caltech; Caltech, JPL; Massey, Richard [Royal Observ., Edinburgh; Dobke, Benjamin M [Caltech; Caltech, JPL

    2011-06-01T23:59:59.000Z

    Future orbiting observatories will survey large areas of sky in order to constrain the physics of dark matter and dark energy using weak gravitational lensing and other methods. Lossy compression of the resultant data will improve the cost and feasibility of transmitting the images through the space communication network. We evaluate the consequences of the lossy compression algorithm of Bernstein et al. (2010) for the high-precision measurement of weak-lensing galaxy ellipticities. This square-root algorithm compresses each pixel independently, and the information discarded is by construction less than the Poisson error from photon shot noise. For simulated space-based images (without cosmic rays) digitized to the typical 16 bits per pixel, application of the lossy compression followed by image-wise lossless compression yields images with only 2.4 bits per pixel, a factor of 6.7 compression. We demonstrate that this compression introduces no bias in the sky background. The compression introduces a small amount of additional digitization noise to the images, and we demonstrate a corresponding small increase in ellipticity measurement noise. The ellipticity measurement method is biased by the addition of noise, so the additional digitization noise is expected to induce a multiplicative bias on the galaxies measured ellipticities. After correcting for this known noise-induced bias, we find a residual multiplicative ellipticity bias of m {approx} -4 x 10{sup -4}. This bias is small when compared to the many other issues that precision weak lensing surveys must confront, and furthermore we expect it to be reduced further with better calibration of ellipticity measurement methods.

  5. Lossy compression of weak lensing data

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Vanderveld, R Ali; Bernstein, Gary M; Stoughton, Chris; Rhodes, Jason; Massey, Richard; Dobke, Benjamin M

    2011-06-01T23:59:59.000Z

    Future orbiting observatories will survey large areas of sky in order to constrain the physics of dark matter and dark energy using weak gravitational lensing and other methods. Lossy compression of the resultant data will improve the cost and feasibility of transmitting the images through the space communication network. We evaluate the consequences of the lossy compression algorithm of Bernstein et al. (2010) for the high-precision measurement of weak-lensing galaxy ellipticities. This square-root algorithm compresses each pixel independently, and the information discarded is by construction less than the Poisson error from photon shot noise. For simulated space-based images (without cosmicmore »rays) digitized to the typical 16 bits per pixel, application of the lossy compression followed by image-wise lossless compression yields images with only 2.4 bits per pixel, a factor of 6.7 compression. We demonstrate that this compression introduces no bias in the sky background. The compression introduces a small amount of additional digitization noise to the images, and we demonstrate a corresponding small increase in ellipticity measurement noise. The ellipticity measurement method is biased by the addition of noise, so the additional digitization noise is expected to induce a multiplicative bias on the galaxies measured ellipticities. After correcting for this known noise-induced bias, we find a residual multiplicative ellipticity bias of m {approx} -4 x 10{sup -4}. This bias is small when compared to the many other issues that precision weak lensing surveys must confront, and furthermore we expect it to be reduced further with better calibration of ellipticity measurement methods.« less

  6. Quantum logic with weakly coupled qubits

    E-Print Network [OSTI]

    Michael R. Geller; Emily J. Pritchett; Andrei Galiautdinov; John M. Martinis

    2009-06-29T23:59:59.000Z

    There are well-known protocols for performing CNOT quantum logic with qubits coupled by particular high-symmetry (Ising or Heisenberg) interactions. However, many architectures being considered for quantum computation involve qubits or qubits and resonators coupled by more complicated and less symmetric interactions. Here we consider a widely applicable model of weakly but otherwise arbitrarily coupled two-level systems, and use quantum gate design techniques to derive a simple and intuitive CNOT construction. Useful variations and extensions of the solution are given for common special cases.

  7. Quantum logic with weakly coupled qubits

    E-Print Network [OSTI]

    Geller, Michael R; Galiautdinov, Andrei; Martinis, John M

    2009-01-01T23:59:59.000Z

    There are well-known protocols for performing CNOT quantum logic with qubits coupled by particular high-symmetry (Ising or Heisenberg) interactions. However, many architectures being considered for quantum computation involve qubits or qubits and resonators coupled by more complicated and less symmetric interactions. Here we consider a widely applicable model of weakly but otherwise arbitrarily coupled two-level systems, and use quantum gate design techniques to derive a simple and intuitive CNOT construction. Useful variations and extensions of the solution are given for common special cases.

  8. Supersymmetric Higgs Bosons in Weak Boson Fusion

    E-Print Network [OSTI]

    W. Hollik; T. Plehn; M. Rauch; H. Rzehak

    2008-04-17T23:59:59.000Z

    We compute the complete supersymmetric next-to-leading order corrections to the production of a light Higgs boson in weak boson fusion. The size of the electroweak corrections is of similar order as the next-to-leading order corrections in the Standard Model. The supersymmetric QCD corrections turn out to be significantly smaller than their electroweak counterparts. These higher--order corrections are an important ingredient to a precision analysis of the (supersymmetric) Higgs sector at the LHC, either as a known correction factor or as a contribution to the theory error.

  9. Weak Interaction Studies with 6He

    E-Print Network [OSTI]

    A. Knecht; Z. T. Alexander; Y. Bagdasarova; T. M. Cope; B. G. Delbridge; X. Flechard; A. Garcia; R. Hong; E. Lienard; P. Mueller; O. Naviliat-Cuncic; A. S. C. Palmer; R. G. H. Robertson; D. W. Storm; H. E. Swanson; S. Utsuno; F. Wauters; W. Williams; C. Wrede; D. W. Zumwalt

    2012-10-19T23:59:59.000Z

    The 6He nucleus is an ideal candidate to study the weak interaction. To this end we have built a high-intensity source of 6He delivering ~10^10 atoms/s to experiments. Taking full advantage of that available intensity we have performed a high-precision measurement of the 6He half-life that directly probes the axial part of the nuclear Hamiltonian. Currently, we are preparing a measurement of the beta-neutrino angular correlation in 6He beta decay that will allow to search for new physics beyond the Standard Model in the form of tensor currents.

  10. Probing the Proton's Weak Side | Jefferson Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah47,193.70 Hg Mercury 35 Br BromineProbing the Proton's Weak Side

  11. Quantum weak chaos in a degenerate system

    E-Print Network [OSTI]

    V. Ya. Demikhovskii; D. I. Kamenev; G. A. Luna-Acosta

    1998-09-27T23:59:59.000Z

    Quantum weak chaos is studied in a perturbed degenerate system --- a charged particle interacting with a monochromatic wave in a transverse magnetic field. The evolution operator for an arbitrary number of periods of the external field is built and its structure is explored in terms of the QE (quasienergy eigenstates) under resonance condition (wave frequency $=$ cyclotron frequency) in the regime of weak classical chaos. The new phenomenon of diffusion via the quantum separatrices and the influence of chaos on diffusion are investigated and, in the quasi classical limit, compared with its classical dynamics. We determine the crossover from purely quantum diffusion to a diffusion which is the quantum manifestation of classical diffusion along the stochastic web. This crossover results from the non-monotonic dependence of the characteristic localization length of the QE states on the wave amplitude. The width of the quantum separatrices was computed and compared with the width of the classical stochastic web. We give the physical parameters which can be realized experimentally to show the manifestation of quantum chaos in nonlinear acoustic resonance.

  12. Weak Lensing Detection in CMB Maps

    E-Print Network [OSTI]

    F. Bernardeau

    1997-03-05T23:59:59.000Z

    The weak lensing effects are known to change only weakly the shape of the power spectrum of the Cosmic Microwave Background (CMB) temperature fluctuations. I show here that they nonetheless induce specific non-Gaussian effects that can be detectable with the four-point correlation function of the CMB anisotropies. The magnitude and geometrical dependences of this correlation function are investigated in detail. It is thus found to scale as the square of the derivative of the two-point correlation function and as the angular correlation function of the gravitational displacement field. It also contains specific dependences on the shape of the quadrangle formed by the four directions. When averaged at a given scale, the four-point function, that identifies with the connected part of the fourth moment of the probability distribution function of the local filtered temperature, scales as the square of logarithmic slope of its second moment, and as the variance of the gravitational magnification at the same angular scale. All these effects have been computed for specific cosmological models. It is worth noting that, as the amplitude of the gravitational lens effects has a specific dependence on the cosmological parameters, the detection of the four-point correlation function could provide precious complementary constraints to those brought by the temperature power spectrum.

  13. Weak Scale From the Maximum Entropy Principle

    E-Print Network [OSTI]

    Yuta Hamada; Hikaru Kawai; Kiyoharu Kawana

    2014-09-23T23:59:59.000Z

    The theory of multiverse and wormholes suggests that the parameters of the Standard Model are fixed in such a way that the radiation of the $S^{3}$ universe at the final stage $S_{rad}$ becomes maximum, which we call the maximum entropy principle. Although it is difficult to confirm this principle generally, for a few parameters of the Standard Model, we can check whether $S_{rad}$ actually becomes maximum at the observed values. In this paper, we regard $S_{rad}$ at the final stage as a function of the weak scale ( the Higgs expectation value ) $v_{h}$, and show that it becomes maximum around $v_{h}={\\cal{O}}(300\\text{GeV})$ when the dimensionless couplings in the Standard Model, that is, the Higgs self coupling, the gauge couplings, and the Yukawa couplings are fixed. Roughly speaking, we find that the weak scale is given by \\begin{equation} v_{h}\\sim\\frac{T_{BBN}^{2}}{M_{pl}y_{e}^{5}},\

  14. Weak Scale From the Maximum Entropy Principle

    E-Print Network [OSTI]

    Hamada, Yuta; Kawana, Kiyoharu

    2014-01-01T23:59:59.000Z

    The theory of multiverse and wormholes suggests that the parameters of the Standard Model are fixed in such a way that the radiation of the $S^{3}$ universe at the final stage $S_{rad}$ becomes maximum, which we call the maximum entropy principle. Although it is difficult to confirm this principle generally, for a few parameters of the Standard Model, we can check whether $S_{rad}$ actually becomes maximum at the observed values. In this paper, we regard $S_{rad}$ at the final stage as a function of the weak scale ( the Higgs expectation value ) $v_{h}$, and show that it becomes maximum around $v_{h}={\\cal{O}}(300\\text{GeV})$ when the dimensionless couplings in the Standard Model, that is, the Higgs self coupling, the gauge couplings, and the Yukawa couplings are fixed. Roughly speaking, we find that the weak scale is given by \\begin{equation} v_{h}\\sim\\frac{T_{BBN}^{2}}{M_{pl}y_{e}^{5}},\

  15. Method and apparatus to predict the remaining service life of an operating system

    DOE Patents [OSTI]

    Greitzer, Frank L. (Richland, WA); Kangas, Lars J. (West Richland, WA); Terrones, Kristine M. (Los Alamos, NM); Maynard, Melody A. (Richland, WA); Pawlowski, Ronald A. (West Richland, WA), Ferryman; Thomas A. (Richland, WA); Skorpik, James R. (Kennewick, WA); Wilson, Bary W. (Coconut Creek, FL)

    2008-11-25T23:59:59.000Z

    A method and computer-based apparatus for monitoring the degradation of, predicting the remaining service life of, and/or planning maintenance for, an operating system are disclosed. Diagnostic information on degradation of the operating system is obtained through measurement of one or more performance characteristics by one or more sensors onboard and/or proximate the operating system. Though not required, it is preferred that the sensor data are validated to improve the accuracy and reliability of the service life predictions. The condition or degree of degradation of the operating system is presented to a user by way of one or more calculated, numeric degradation figures of merit that are trended against one or more independent variables using one or more mathematical techniques. Furthermore, more than one trendline and uncertainty interval may be generated for a given degradation figure of merit/independent variable data set. The trendline(s) and uncertainty interval(s) are subsequently compared to one or more degradation figure of merit thresholds to predict the remaining service life of the operating system. The present invention enables multiple mathematical approaches in determining which trendline(s) to use to provide the best estimate of the remaining service life.

  16. Weakly nonassociative algebras, Riccati and KP hierarchies

    E-Print Network [OSTI]

    Aristophanes Dimakis; Folkert Muller-Hoissen

    2008-01-16T23:59:59.000Z

    It has recently been observed that certain nonassociative algebras (called "weakly nonassociative", WNA) determine, via a universal hierarchy of ordinary differential equations, solutions of the KP hierarchy with dependent variable in an associative subalgebra (the middle nucleus). We recall central results and consider a class of WNA algebras for which the hierarchy of ODEs reduces to a matrix Riccati hierarchy, which can be easily solved. The resulting solutions of a matrix KP hierarchy then determine (under a rank 1 condition) solutions of the scalar KP hierarchy. We extend these results to the discrete KP hierarchy. Moreover, we build a bridge from the WNA framework to the Gelfand-Dickey formulation of the KP hierarchy.

  17. Is Fusion Inhibited for Weakly Bound Nuclei?

    SciTech Connect (OSTI)

    Takahashi, J.; Munhoz, M.; Szanto, E.M.; Carlin, N.; Added, N.; Suaide, A.A.; de Moura, M.M.; Liguori Neto, R.; Szanto de Toledo, A. [Universidade de Sao Paulo, Institute de Fisica, Departamento de Fisica Nuclear, Caixa Postal 66318, 05389-970 Sao Paulo, Sao Paulo, (Brasil)] [Universidade de Sao Paulo, Institute de Fisica, Departamento de Fisica Nuclear, Caixa Postal 66318, 05389-970 Sao Paulo, Sao Paulo, (Brasil); Canto, L.F. [Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, RJ, (Brasil)] [Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, RJ, (Brasil)

    1997-01-01T23:59:59.000Z

    Complete fusion of light radioactive nuclei is predicted to be hindered at near-barrier energies. This feature is investigated in the case of the least bound stable nuclei. Evaporation residues resulting from the {sup 6,7}Li+{sup 9}Be and {sup 6,7}Li+{sup 12}C fusion reactions have been measured in order to study common features in reactions involving light weakly bound nuclei. The experimental excitation functions revealed that the fusion cross section is significantly smaller than the total reaction cross section and also smaller than the fusion cross section expected from the available systematics. A clear correlation between the fusion probability and nucleon (cluster) separation energy has been established.The results suggest that the breakup process has a strong influence on the hindrance of the fusion cross section. {copyright} {ital 1996} {ital The American Physical Society}

  18. Globular clusters with the extended horizontal-branch as remaining cores of galaxy building blocks

    E-Print Network [OSTI]

    Young-Wook Lee; Hansung B. Gim; Chul Chung

    2007-07-11T23:59:59.000Z

    The relics of building blocks that made stellar halo and bulge are yet to be discovered unless they were completely disrupted throughout the history of the Galaxy. Here we suggest that about 25% of the Milky Way globular clusters have characteristics of the remaining cores of these early building blocks rather than genuine star clusters. They are clearly distinct from other normal globular clusters in the presence of extended horizontal-branch and multiple stellar populations, in mass (brightness), and most importantly in orbital kinematics. Based on this result, a three-stage formation picture of the Milky Way is suggested, which includes early mergers, collapse, and later accretion.

  19. Crack closure effects on fatigue crack growth thresholds and remaining life in an HSLA steel

    SciTech Connect (OSTI)

    Todd, J.A.; Mostovoy, S. [Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Mechanical, Materials and Aerospace Engineering; Chen, L. [Texas Instruments, Attleboro, MA (United States); Yankov, E.Y. [A. Finkl and Sons, Chicago, IL (United States)

    1997-02-01T23:59:59.000Z

    The effects of crack closure on the near-threshold corrosion fatigue crack growth behavior of Mil S-24645 HSLA steel and its weld metal have been investigated in air, ASTM seawater at the free corrosion potential, and ASTM seawater at {minus}0.8V and {minus}1.0V (SCE) using frequencies of 10, 2, and 0.2 Hz, and a stress ratio, R = 0.1. Remaining life, in the presence and absence of crack closure, has been estimated as a function of applied stress range for a structure containing a 3-mm-deep surface semi-elliptical flaw.

  20. A little rain doesn't fix it: Farmers and ranchers remain cautious as drought continues

    E-Print Network [OSTI]

    Kalisek, Danielle

    2012-01-01T23:59:59.000Z

    A little rain doesn?t fix it Farmers and ranchers remain cautious as drought continues Summer 2012 tx H2O 11 ] Story by Danielle Kalisek Rains in the Brazos Valley early in 2012 helped this grass green up, but more rains are needed now... to help warm-season grasses. Photo by Danielle Kalisek. This might sound like a broken record, but it still rings true: Last year?s drought was historic the worst one-year drought in Texas? history. #31;ough recent rains in some parts of the state...

  1. MCA 22-3-801 - Human Skeletal Remains and Burial Site Protection Act | Open

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:LandownersLuther, Oklahoma: EnergyMAREC Jump to: navigation,Remains |

  2. appearance of the remaining chapters. This Flash transmits the first installment

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2, 2015Visiting Strong,Women @JoinEnergyappearance of the remaining

  3. The Q_weak Experimental Apparatus

    E-Print Network [OSTI]

    Qweak Collaboration; T. Allison; M. Anderson; D. Androic; D. S. Armstrong; A. Asaturyan; T. D. Averett; R. Averill; J. Balewski; J. Beaufait; R. S. Beminiwattha; J. Benesch; F. Benmokhtar; J. Bessuille; J. Birchall; E. Bonnell; J. Bowman; P. Brindza; D. B. Brown; R. D. Carlini; G. D. Cates; B. Cavness; G. Clark; J. C. Cornejo; S. Covrig Dusa; M. M. Dalton; C. A. Davis; D. C. Dean; W. Deconinck; J. Diefenbach; K. Dow; J. F. Dowd; J. A. Dunne; D. Dutta; W. S. Duvall; J. R. Echols; M. Elaasar; W. R. Falk; K. D. Finelli; J. M. Finn; D. Gaskell; M. T. W. Gericke; J. Grames; V. M. Gray; K. Grimm; F. Guo; J. Hansknecht; D. J. Harrison; E. Henderson; J. R. Hoskins; E. Ihloff; K. Johnston; D. Jones; M. Jones; R. Jones; M. Kargiantoulakis; J. Kelsey; N. Khan; P. M. King; E. Korkmaz; S. Kowalski; A. Kubera; J. Leacock; J. P. Leckey; A. R. Lee; J. H. Lee; L. Lee; Y. Liang; S. MacEwan; D. Mack; J. A. Magee; R. Mahurin; J. Mammei; J. W. Martin; A. McCreary; M. H. McDonald; M. J. McHugh; P. Medeiros; D. Meekins; J. Mei; R. Michaels; A. Micherdzinska; A. Mkrtchyan; H. Mkrtchyan; N. Morgan; J. Musson; K. E. Mesick; A. Narayan; L. Z. Ndukum; V. Nelyubin; Nuruzzaman; W. T. H. van Oers; A. K. Opper; S. A. Page; J. Pan; K. D. Paschke; S. K. Phillips; M. L. Pitt; M. Poelker; J. F. Rajotte; W. D. Ramsay; W. R. Roberts; J. Roche; P. W. Rose; B. Sawatzky; T. Seva; M. H. Shabestari; R. Silwal; N. Simicevic; G. R. Smith; S. Sobczynski; P. Solvignon; D. T. Spayde; B. Stokes; D. W. Storey; A. Subedi; R. Subedi; R. Suleiman; V. Tadevosyan; W. A. Tobias; V. Tvaskis; E. Urban; B. Waidyawansa; P. Wang; S. P. Wells; S. A. Wood; S. Yang; S. Zhamkochyan; R. B. Zielinski

    2015-01-06T23:59:59.000Z

    The Jefferson Lab Q_weak experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons from an unpolarized liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this experiment to meet the technical challenges presented by the smallest and most precise ${\\vec{e}}$p asymmetry ever measured. Technical milestones were achieved at Jefferson Lab in target power, beam current, beam helicity reversal rate, polarimetry, detected rates, and control of helicity-correlated beam properties. The experiment employed 180 microA of 89% longitudinally polarized electrons whose helicity was reversed 960 times per second. The electrons were accelerated to 1.16 GeV and directed to a beamline with extensive instrumentation to measure helicity-correlated beam properties that can induce false asymmetries. Moller and Compton polarimetry were used to measure the electron beam polarization to better than 1%. The electron beam was incident on a 34.4 cm liquid hydrogen target. After passing through a triple collimator system, scattered electrons between 5.8 degrees and 11.6 degrees were bent in the toroidal magnetic field of a resistive copper-coil magnet. The electrons inside this acceptance were focused onto eight fused silica Cerenkov detectors arrayed symmetrically around the beam axis. A total scattered electron rate of about 7 GHz was incident on the detector array. The detectors were read out in integrating mode by custom-built low-noise pre-amplifiers and 18-bit sampling ADC modules. The momentum transfer Q^2 = 0.025 GeV^2 was determined using dedicated low-current (~100 pA) measurements with a set of drift chambers before (and a set of drift chambers and trigger scintillation counters after) the toroidal magnet.

  4. Magnified Weak Lensing Cross Correlation Tomography

    SciTech Connect (OSTI)

    Ulmer, Melville P., Clowe, Douglas I.

    2010-11-30T23:59:59.000Z

    This project carried out a weak lensing tomography (WLT) measurement around rich clusters of galaxies. This project used ground based photometric redshift data combined with HST archived cluster images that provide the WLT and cluster mass modeling. The technique has already produced interesting results (Guennou et al, 2010,Astronomy & Astrophysics Vol 523, page 21, and Clowe et al, 2011 to be submitted). Guennou et al have validated that the necessary accuracy can be achieved with photometric redshifts for our purposes. Clowe et al titled "The DAFT/FADA survey. II. Tomographic weak lensing signal from 10 high redshift clusters," have shown that for the **first time** via this purely geometrical technique, which does not assume a standard rod or candle, that a cosmological constant is **required** for flat cosmologies. The intent of this project is not to produce the best constraint on the value of the dark energy equation of state, w. Rather, this project is to carry out a sustained effort of weak lensing tomography that will naturally feed into the near term Dark Energy Survey (DES) and to provide invaluable mass calibration for that project. These results will greatly advance a key cosmological method which will be applied to the top-rated ground-based project in the Astro2020 decadal survey, LSST. Weak lensing tomography is one of the key science drivers behind LSST. CO-I Clowe is on the weak lensing LSST committee, and senior scientist on this project, at FNAL James Annis, plays a leading role in the DES. This project has built on successful proposals to obtain ground-based imaging for the cluster sample. By 1 Jan, it is anticipated the project will have accumulated complete 5-color photometry on 30 (or about 1/3) of the targeted cluster sample (public webpage for the survey is available at http://cencos.oamp.fr/DAFT/ and has a current summary of the observational status of various clusters). In all, the project has now been awarded the equivalent of over 60 nights on 4-m class telescopes, which gives concrete evidence of strong community support for this project. The WLT technique is based on the dependence of the gravitational shear signal on the angular diameter distances between the observer, the lens, and the lensed galaxy to measure cosmological parameters. By taking the ratio of measured shears of galaxies with different redshifts around the same lens, one obtains a measurement of the ratios of the angular diameter distances involved. Making these observations over a large range of lenses and background galaxy redshifts will measure the history of the expansion rate of the universe. Because this is a purely geometric measurement, it is insensitive to any form of evolution of objects or the necessity to understand the physics in the early universe. Thus, WLT was identified by the Dark Energy Task Force as perhaps the best method to measure the evolution of DE. To date, however, the conjecture of the DETF has not been experimentally verified, but will be by the proposed project. The primary reason for the lack of tomography measurements is that one must have an exceptional data-set to attempt the measurement. One needs both extremely good seeing (or space observations) in order to minimize the point spread function smearing corrections on weak lensing shear measurements and deep, multi-color data, from B to z, to measure reliable photometric redshifts of the background galaxies being lensed (which are typically too faint to obtain spectroscopic redshifts). Because the entire process from multi-drizzling the HST images, and then creating shear maps, to gathering the necessary ground based observations, to generating photo-zs and then carrying out the tomography is a complicated task, until the creation of our team, nobody has taken the time to connect all the levels of expertise necessary to carry out this project based on HST archival data. Our data are being used in 2 Ph.D. theses. Kellen Murphy, at Ohio University, is using the tomography data along with simulations in a thesis expected to be completed in Jun

  5. Current Understanding and Remaining Challenges in Modeling Long-Term Degradation of Borosilicate Nuclear Waste Glasses

    SciTech Connect (OSTI)

    Vienna, John D. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Ryan, Joseph V. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Gin, Stephane [CEA Marcoule, DTCD SECM, Bagnols-sur-Ceze (France); Inagaki, Yaohiro [Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoda (Japan)

    2013-12-01T23:59:59.000Z

    Chemical durability is not a single material property that can be uniquely measured. Instead it is the response to a host of coupled material and environmental processes whose rates are estimated by a combination of theory, experiment, and modeling. High-level nuclear waste (HLW) glass is perhaps the most studied of any material yet there remain significant technical gaps regarding their chemical durability. The phenomena affecting the long-term performance of HLW glasses in their disposal environment include surface reactions, transport properties to and from the reacting glass surface, and ion exchange between the solid glass and the surrounding solution and alteration products. The rates of these processes are strongly influenced and are coupled through the solution chemistry, which is in turn influenced by the reacting glass and also by reaction with the near-field materials and precipitation of alteration products. Therefore, those processes must be understood sufficiently well to estimate or bound the performance of HLW glass in its disposal environment over geologic time-scales. This article summarizes the current state of understanding of surface reactions, transport properties, and ion exchange along with the near-field materials and alteration products influences on solution chemistry and glass reaction rates. Also summarized are the remaining technical gaps along with recommended approaches to fill those technical gaps.

  6. Lubrication Oil Condition Monitoring and Remaining Useful Life Prediction with Particle Filtering

    E-Print Network [OSTI]

    Junda Zhu; Jae M. Yoon; David He; Yongzhi Qu; Eric Bechhoefer

    In order to reduce the costs of wind energy, it is necessary to improve the wind turbine availability and reduce the operational and maintenance costs. The reliability and availability of a functioning wind turbine depend largely on the protective properties of the lubrication oil for its drive train subassemblies such as the gearbox and means for lubrication oil condition monitoring and degradation detection. The wind industry currently uses lubrication oil analysis for detecting gearbox and bearing wear but cannot detect the functional failures of the lubrication oils. The main purpose of lubrication oil condition monitoring and degradation detection is to determine whether the oils have deteriorated to such a degree that they no longer fulfill their functions. This paper describes a research on developing online lubrication oil condition monitoring and remaining useful life prediction using particle filtering technique and commercially available online sensors. It first introduces the lubrication oil condition monitoring and degradation detection for wind turbines. Viscosity and dielectric constant are selected as the performance parameters to model the degradation of lubricants. In particular, the lubricant performance evaluation and remaining useful life prediction of degraded lubrication oil with viscosity and dielectric constant data using particle filtering are presented. A simulation study based on lab verified models is provided to demonstrate the effectiveness of the developed technique. 1.

  7. Economies of size and other factors influencing costs and returns on major U.S. crop farms with implications for debt repayment capacity

    E-Print Network [OSTI]

    McDonald, Sandra Kay

    1978-01-01T23:59:59.000Z

    in Partial fu]fillment. of the requirement for the degree of MASTER OF SCIENCE August 1978 Major Subject: Ag icultural Economics ECONOMIES OF SIZE AND OTHER FACTORS INFLUENCING COSTS AND RETURNS ON MAJOR U. S. CROP FAIbMS WITH IMPLICATIONS FOR DEBT... REPAYMENT CAPACITY A Thesis by Sandra Kay McDonald Approved a, to style and content by: r hairm- Cor mit te (Head oI Department) (Member) (Member) August 1978 ABSTRACT Economies of Size and Other Factors Influencing Costs and Returns on Major U...

  8. Weak gravitational lensing with the Square Kilometre Array

    E-Print Network [OSTI]

    Brown, M L; Camera, S; Harrison, I; Joachimi, B; Metcalf, R B; Pourtsidou, A; Takahashi, K; Zuntz, J A; Abdalla, F B; Bridle, S; Jarvis, M; Kitching, T D; Miller, L; Patel, P

    2015-01-01T23:59:59.000Z

    We investigate the capabilities of various stages of the SKA to perform world-leading weak gravitational lensing surveys. We outline a way forward to develop the tools needed for pursuing weak lensing in the radio band. We identify the key analysis challenges and the key pathfinder experiments that will allow us to address them in the run up to the SKA. We identify and summarize the unique and potentially very powerful aspects of radio weak lensing surveys, facilitated by the SKA, that can solve major challenges in the field of weak lensing. These include the use of polarization and rotational velocity information to control intrinsic alignments, and the new area of weak lensing using intensity mapping experiments. We show how the SKA lensing surveys will both complement and enhance corresponding efforts in the optical wavebands through cross-correlation techniques and by way of extending the reach of weak lensing to high redshift.

  9. Why does Low-Luminosity AGN Fueling Remain an Unsolved Problem?

    E-Print Network [OSTI]

    Paul Martini

    2004-04-21T23:59:59.000Z

    Despite many years of effort, observational studies have not found a strong correlation between the presence of any proposed fueling mechanism and low-luminosity AGN. After a discussion of the mass requirements for fueling, I summarize this observational work and provide a number of hypotheses for why the nature of AGN fueling has remained unresolved. In particular, I stress the potential importance of the increasing number of candidate fueling mechanisms with decreasing mass accretion rate, the relevant spatial scales for different fueling mechanisms, and the lifetime of an individual episode of nuclear accretion. The episodic AGN lifetime is a particularly relevant complication if it is comparable to or shorter than the time that the responsible fueling mechanisms are observationally detectable. I conclude with a number of relatively accessible areas for future investigation.

  10. Weak nuclear forces cause the strong nuclear force

    E-Print Network [OSTI]

    E. L. Koschmieder

    2007-12-11T23:59:59.000Z

    We determine the strength of the weak nuclear force which holds the lattices of the elementary particles together. We also determine the strength of the strong nuclear force which emanates from the sides of the nuclear lattices. The strong force is the sum of the unsaturated weak forces at the surface of the nuclear lattices. The strong force is then about ten to the power of 6 times stronger than the weak force between two lattice points.

  11. Mean and covariance matrix adaptive estimation for a weakly ...

    E-Print Network [OSTI]

    2011-01-25T23:59:59.000Z

    AMS 2000 subject classification: Primary: 62G05, 62M10; Secondary: 90C15. Key words and phrases: Adaptive estimation, weakly stationary process, stochastic ...

  12. Study atom-vacuum interaction by the weak measurement technique

    E-Print Network [OSTI]

    M. Zhang; S. Y. Zhu

    2014-10-27T23:59:59.000Z

    Quantum weak measurement attracts much interests recently [Rev. Mod. Phys. 86, 307 (2014)], as it could amplify some weak signals and provide a technique to observe the nonclassical phenomenons. Here, we apply this technique to study the interaction between the free atoms and the vacuum in a cavity. Due to the gradient field in the vacuum cavity, the external orbital motions and the internal electronic states of the atoms can be weakly coupled via the atom-field electric-dipole interaction. We show an interesting phenomenon that, within the properly post-selected internal states, the weak atom-vacuum interaction could generate a large change to the external motions of atoms.

  13. Reversing the Weak Quantum Measurement for a Photonic Qubit

    E-Print Network [OSTI]

    Yong-Su Kim; Young-Wook Cho; Young-Sik Ra; Yoon-Ho Kim

    2009-03-18T23:59:59.000Z

    We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of a qubit which is subsequently reversed to the original state after a successful reversing operation. Both the weak measurement and the reversal operation are implemented linear optically. The state recovery fidelity, determined by quantum process tomography, is shown to be over 94% for partial-collapse strength up to 0.9. We also experimentally study information gain due to the weak measurement and discuss the role of the reversing operation as an information erasure.

  14. Strengths and Weaknesses of Quantum Fingerprinting

    E-Print Network [OSTI]

    Dmitry Gavinsky; Julia Kempe; Ronald de Wolf

    2006-03-20T23:59:59.000Z

    We study the power of quantum fingerprints in the simultaneous message passing (SMP) setting of communication complexity. Yao recently showed how to simulate, with exponential overhead, classical shared-randomness SMP protocols by means of quantum SMP protocols without shared randomness ($Q^\\parallel$-protocols). Our first result is to extend Yao's simulation to the strongest possible model: every many-round quantum protocol with unlimited shared entanglement can be simulated, with exponential overhead, by $Q^\\parallel$-protocols. We apply our technique to obtain an efficient $Q^\\parallel$-protocol for a function which cannot be efficiently solved through more restricted simulations. Second, we tightly characterize the power of the quantum fingerprinting technique by making a connection to arrangements of homogeneous halfspaces with maximal margin. These arrangements have been well studied in computational learning theory, and we use some strong results obtained in this area to exhibit weaknesses of quantum fingerprinting. In particular, this implies that for almost all functions, quantum fingerprinting protocols are exponentially worse than classical deterministic SMP protocols.

  15. Atomic Inference from Weak Gravitational Lensing Data

    SciTech Connect (OSTI)

    Marshall, Phil; /KIPAC, Menlo Park

    2005-12-14T23:59:59.000Z

    We present a novel approach to reconstructing the projected mass distribution from the sparse and noisy weak gravitational lensing shear data. The reconstructions are regularized via the knowledge gained from numerical simulations of clusters, with trial mass distributions constructed from n NFW profile ellipsoidal components. The parameters of these ''atoms'' are distributed a priori as in the simulated clusters. Sampling the mass distributions from the atom parameter probability density function allows estimates of the properties of the mass distribution to be generated, with error bars. The appropriate number of atoms is inferred from the data itself via the Bayesian evidence, and is typically found to be small, reecting the quality of the data. Ensemble average mass maps are found to be robust to the details of the noise realization, and succeed in recovering the demonstration input mass distribution (from a realistic simulated cluster) over a wide range of scales. As an application of such a reliable mapping algorithm, we comment on the residuals of the reconstruction and the implications for predicting convergence and shear at specific points on the sky.

  16. Graphene transparency in weak magnetic fields

    E-Print Network [OSTI]

    David Valenzuela; Saúl Hernández-Ortiz; Marcelo Loewe; Alfredo Raya

    2014-10-20T23:59:59.000Z

    We carry out an explicit calculation of the vacuum polarization tensor for an effective low-energy model of monolayer graphene in the presence of a weak magnetic field of intensity $B$ perpendicularly aligned to the membrane. By expanding the quasiparticle propagator in the Schwinger proper time representation up to order $(eB)^2$, where $e$ is the unit charge, we find an explicitly transverse tensor, consistent with gauge invariance. Furthermore, assuming that graphene is radiated with monochromatic light of frequency $\\omega$ along the external field direction, from the modified Maxwell's equations we derive the intensity of transmitted light and the angle of polarization rotation in terms of the longitudinal ($\\sigma_{xx}$) and transverse ($\\sigma_{xy}$) conductivities. Corrections to these quantities, both calculated and measured, are of order $(eB)^2/\\omega^4$. Our findings generalize and complement previously known results reported in literature regarding the light absorption problem in graphene from the experimental and theoretical points of view, with and without external magnetic fields.

  17. An Assessment of Uncertainty in Remaining Life Estimation for Nuclear Structural Materials

    SciTech Connect (OSTI)

    Ramuhalli, Pradeep; Griffin, Jeffrey W.; Fricke, Jacob M.; Bond, Leonard J.

    2012-12-01T23:59:59.000Z

    In recent years, several operating US light-water nuclear power reactors (LWRs) have moved to extended-life operations (from 40 years to 60 years), and there is interest in the feasibility of extending plant life to 80 years. Operating experience suggests that material degradation of structural components in LWRs (such as the reactor pressure vessel) is expected to be the limiting factor for safe operation during extended life. Therefore, a need exists for assessing the condition of LWR structural components and determining its remaining useful life (RUL). The ability to estimate RUL of degraded structural components provides a basis for determining safety margins (i.e., whether safe operation over some pre-determined time horizon is possible), and scheduling degradation management activities (such as potentially modifying operating conditions to limit further degradation growth). A key issue in RUL estimation is calculation of uncertainty bounds, which are dependent on current material state, as well as past and future stressor levels (such as time-at-temperature, pressure, and irradiation). This paper presents a preliminary empirical investigation into the uncertainty of RUL estimates for nuclear structural materials.

  18. Neutron measurements of the fuel remaining in the TMI II once-through steam generators (OTSG'S)

    SciTech Connect (OSTI)

    Geelhood, B.D.; Abel, K.H.

    1989-02-01T23:59:59.000Z

    Polypropylene tubes containing a string of 18 copper rods were inserted into the lower head region and each J-leg of the two once-through steam generators (OTSG) of the unit two reactor at Three Mile Island. The object was to measure the neutron flux present in those regions and estimate the amount of residual fuel remaining in each OTSG. The neutron flux from any residual fuel induces a radioisotope, /sup 64/Cu, in the copper coupons. The /sup 64/Cu activity is detected by coincidence counting the two 511-keV gamma rays produced by the annihilation of the positron emitted in the decay of /sup 64/Cu. The copper coupons were placed between two 6-inch diameter, 6-inch long NaI(Tl) crystals and the electronics produced a coincidence count whenever the two gamma rays were uniquely detected. The net coincidence count is proportional to the amount of /sup 64/Cu activity in the coupon. This document discusses calculation methods, statistical methods, and results of this research. 3 figs., 30 tabs.

  19. Weakly Terminal Objects in Quasicategories of SET Endofunctors

    E-Print Network [OSTI]

    Barto, Libor

    Weakly Terminal Objects in Quasicategories of SET Endofunctors Libor Barto # Mathematical Institute and mappings) and all natural transformations has a terminal object -- the constant functor C1 . We construct here the terminal (or at least the smallest weakly terminal object, which is rigid) in some important

  20. Weakly Terminal Objects in Quasicategories of SET Endofunctors

    E-Print Network [OSTI]

    Barto, Libor

    Weakly Terminal Objects in Quasicategories of SET Endofunctors Libor Barto Mathematical Institute and mappings) and all natural transformations has a terminal object ­ the constant functor C1. We construct here the terminal (or at least the smallest weakly terminal object, which is rigid) in some important

  1. Modeling active electrolocation in weakly electric fish Habib Ammari

    E-Print Network [OSTI]

    Garnier, Josselin

    Modeling active electrolocation in weakly electric fish Habib Ammari Thomas Boulier Josselin in weakly electric fishes. We first investigate the forward complex conductivity problem and derive the approx- imate boundary conditions on the skin of the fish. Then we provide a dipole approximation

  2. PLM OPPORTUNITIES AND WEAKNESSES TO SUPPORT COLLABORATIVE ENGINEERING

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    PLM OPPORTUNITIES AND WEAKNESSES TO SUPPORT COLLABORATIVE ENGINEERING VALERY MERMINOD CERAM is to discuss the opportunities and the weaknesses of Product Lifecycle Management (PLM) technology to support is based on a 3 years analysis of a PLM system project in a large French company, int the sector of small

  3. Large Deviations in the Superstable Weakly Imperfect Bose Gas 1 Large Deviations in the Superstable Weakly Imperfect Bose Gas

    E-Print Network [OSTI]

    of the condensate. More interesting for our analysis is a discontinuity of the particle density from #- > 0Large Deviations in the Superstable Weakly Imperfect Bose Gas 1 Large Deviations in the Superstable Weakly Imperfect Bose Gas J.­B. Bru a and V.A. Zagrebnov b a FakultË?at fË?ur Physik, UniversitË?at Wien

  4. Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants – Interim Study FY13

    SciTech Connect (OSTI)

    Simmons, Kevin L.; Fifield, Leonard S.; Westman, Matthew P.; Ramuhalli, Pradeep; Pardini, Allan F.; Tedeschi, Jonathan R.; Jones, Anthony M.

    2013-09-27T23:59:59.000Z

    The most important criterion for cable performance is its ability to withstand a design-basis accident. With nearly 1000 km of power, control, instrumentation, and other cables typically found in an NPP, it would be a significant undertaking to inspect all of the cables. Degradation of the cable jacket, electrical insulation, and other cable components is a key issue that is likely to affect the ability of the currently installed cables to operate safely and reliably for another 20 to 40 years beyond the initial operating life. The development of one or more nondestructive evaluation (NDE) techniques and supporting models that could assist in determining the remaining life expectancy of cables or their current degradation state would be of significant interest. The ability to nondestructively determine material and electrical properties of cable jackets and insulation without disturbing the cables or connections has been deemed essential. Currently, the only technique accepted by industry to measure cable elasticity (the gold standard for determining cable insulation degradation) is the indentation measurement. All other NDE techniques are used to find flaws in the cable and do not provide information to determine the current health or life expectancy. There is no single NDE technique that can satisfy all of the requirements needed for making a life-expectancy determination, but a wide range of methods have been evaluated for use in NPPs as part of a continuous evaluation program. The commonly used methods are indentation and visual inspection, but these are only suitable for easily accessible cables. Several NDE methodologies using electrical techniques are in use today for flaw detection but there are none that can predict the life of a cable. There are, however, several physical and chemical ptoperty changes in cable insulation as a result of thermal and radiation damage. In principle, these properties may be targets for advanced NDE methods to provide early warning of aging and degradation. Examples of such key indicators include changes in chemical structure, mechanical modulus, and dielectric permittivity. While some of these indicators are the basis of currently used technologies, there is a need to increase the volume of cable that may be inspected with a single measurement, and if possible, to develop techniques for in-situ inspection (i.e., while the cable is in operation). This is the focus of the present report.

  5. Weak chimeras in minimal networks of coupled phase oscillators

    E-Print Network [OSTI]

    Peter Ashwin; Oleksandr Burylko

    2014-12-10T23:59:59.000Z

    We suggest a definition for a type of chimera state that appears in networks of indistinguishable phase oscillators. Defining a "weak chimera" as a type of invariant set showing partial frequency synchronization, we show that this means they cannot appear in phase oscillator networks that are either globally coupled or too small. We exhibit various networks of four, six and ten indistinguishable oscillators where weak chimeras exist with various dynamics and stabilities. We examine the role of Kuramoto-Sakaguchi coupling in giving degenerate (neutrally stable) families of weak chimera states in these example networks.

  6. Strong and weak gravitational field in $R+?^4/R$ gravity

    E-Print Network [OSTI]

    Kh. Saaidi; A. Vajdi; S. W. Rabiei; A. Aghamohammadi; H. Sheikhahmadi

    2012-01-18T23:59:59.000Z

    We introduce a new approach for investigating the weak field limit of vacuum field equations in $f(R)$ gravity and we find the weak field limit of $f(R)=R+\\mu ^4/R$ gravity. Furthermore, we study the strong gravity regime in $R+\\mu^{4}/R$ model of $f(R)$ gravity. We show the existence of strong gravitational field in vacuum for such model. We find out in the limit $\\mu\\rightarrow 0$, the weak field limit and the strong gravitational field can be regarded as a perturbed Schwarzschild metric.

  7. Ultra-weak sector, Higgs boson mass, and the dilaton

    E-Print Network [OSTI]

    Kyle Allison; Christopher T. Hill; Graham G. Ross

    2014-04-24T23:59:59.000Z

    The Higgs boson mass may arise from a portal coupling to a singlet field $\\sigma$ which has a very large VEV $f \\gg m_\\text{Higgs}$. This requires a sector of "ultra-weak" couplings $\\zeta_i$, where $\\zeta_i \\lesssim m_\\text{Higgs}^2 / f^2$. Ultra-weak couplings are technically naturally small due to a custodial shift symmetry of $\\sigma$ in the $\\zeta_i \\rightarrow 0$ limit. The singlet field $\\sigma$ has properties similar to a pseudo-dilaton. We engineer explicit breaking of scale invariance in the ultra-weak sector via a Coleman-Weinberg potential, which requires hierarchies amongst the ultra-weak couplings.

  8. Violation of the Weak Equivalence Principle in Bekenstein's theory

    E-Print Network [OSTI]

    L. Kraiselburd; H. Vucetich

    2009-02-24T23:59:59.000Z

    Bekenstein has shown that violation of Weak Equivalence Principle is strongly supressed in his model of charge variation. In this paper, it is shown that nuclear magnetic energy is large enough to produce observable effects in Eotvos experiments.

  9. Nuclear Constraints on the Weak Nucleon-Nucleon Interaction

    E-Print Network [OSTI]

    W. C. Haxton

    2008-02-21T23:59:59.000Z

    I discuss the current status of efforts to constrain the strangeness-conserving weak hadronic interaction, which can be isolated in nuclear systems because of the associated parity violation.

  10. Earth's Core Reveals an Inner Weakness | Advanced Photon Source

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    their results to core conditions and found that the strength of iron deep within the Earth is lower than previously thought. This weakness may explain how the crystal structure...

  11. Interaction of vortices in weakly viscous planar flows Thierry Gallay

    E-Print Network [OSTI]

    Gallay, Thierry

    Interaction of vortices in weakly viscous planar flows Thierry Gallay Universit´e de Grenoble I Institut Fourier, UMR CNRS 5582 B.P. 74 F-38402 Saint-Martin-d'H`eres, France Thierry.Gallay

  12. Interaction of vortices in weakly viscous planar flows Thierry Gallay

    E-Print Network [OSTI]

    Gallay, Thierry

    Interaction of vortices in weakly viscous planar flows Thierry Gallay Universitâ??e de Grenoble I Institut Fourier, UMR CNRS 5582 B.P. 74 F­38402 Saint­Martin­d'Hâ??eres, France Thierry.Gallay

  13. Ultra-weak sector, Higgs boson mass, and the dilaton

    SciTech Connect (OSTI)

    Allison, Kyle [University of Oxford; Hill, Christopher T. [FNAL; Ross, Graham G. [University of Oxford

    2014-11-01T23:59:59.000Z

    The Higgs boson mass may arise from a portal coupling to a singlet field $\\sigma$ which has a very large VEV $f \\gg m_\\text{Higgs}$. This requires a sector of "ultra-weak" couplings $\\zeta_i$, where $\\zeta_i \\lesssim m_\\text{Higgs}^2 / f^2$. Ultra-weak couplings are technically naturally small due to a custodial shift symmetry of $\\sigma$ in the $\\zeta_i \\rightarrow 0$ limit. The singlet field $\\sigma$ has properties similar to a pseudo-dilaton. We engineer explicit breaking of scale invariance in the ultra-weak sector via a Coleman-Weinberg potential, which requires hierarchies amongst the ultra-weak couplings.

  14. Weak value measurement with an incoherent measuring device

    E-Print Network [OSTI]

    Young-Wook Cho; Hyang-Tag Lim; Young-Sik Ra; Yoon-Ho Kim

    2009-11-05T23:59:59.000Z

    In the Aharonov-Albert-Vaidman (AAV) weak measurement, it is assumed that the measuring device or the pointer is in a quantum mechanical pure state. In reality, however, it is often not the case. In this paper, we generalize the AAV weak measurement scheme to include more generalized situations in which the measuring device is in a mixed state. We also report an optical implementation of the weak value measurement in which the incoherent pointer is realized with the pseudo-thermal light. The theoretical and experimental results show that the measuring device under the influence of partial decoherence could still be used for amplified detection of minute physical changes and are applicable for implementing the weak value measurement for massive particles.

  15. Power-recycled weak-value-based metrology

    E-Print Network [OSTI]

    Lyons, Kevin; Jordan, Andrew N; Howell, John C; Kwiat, Paul G

    2015-01-01T23:59:59.000Z

    We improve the precision of the interferometric weak-value-based beam deflection measurement by introducing a power recycling mirror, creating a resonant cavity. This results in \\emph{all} the light exiting to the detector with a large deflection, thus eliminating the inefficiency of the rare postselection. The signal-to-noise ratio of the deflection is itself magnified by the weak value. We discuss ways to realize this proposal, using a transverse beam filter and different cavity designs.

  16. Power-recycled weak-value-based metrology

    E-Print Network [OSTI]

    Kevin Lyons; Justin Dressel; Andrew N. Jordan; John C. Howell; Paul G. Kwiat

    2015-04-30T23:59:59.000Z

    We improve the precision of the interferometric weak-value-based beam deflection measurement by introducing a power recycling mirror, creating a resonant cavity. This results in \\emph{all} the light exiting to the detector with a large deflection, thus eliminating the inefficiency of the rare postselection. The signal-to-noise ratio of the deflection is itself magnified by the weak value. We discuss ways to realize this proposal, using a transverse beam filter and different cavity designs.

  17. Effective Field Theory for Top and Weak Boson Physics

    E-Print Network [OSTI]

    Scott Willenbrock

    2012-05-21T23:59:59.000Z

    Effective field theory is the ideal framework for discussing top and weak boson properties. We discuss the application of this framework to top physics at both tree level and one loop. We consider weak boson pair production within an effective field theory framework, and argue that one need not be concerned with the violation of unitarity bounds at energies beyond the region where there are data.

  18. Do bark beetle remains in lake sediments correspond to severe outbreaks? A review of published and ongoing research

    E-Print Network [OSTI]

    Anderson, R. Scott

    Watt e , Kelly Derr a , Michael F.J. Pisaric f , R. Scott Anderson g , Andrea R. Brunelle d outbreak episodes. Our synthesis suggests that the remains of pri- mary attack beetles are rarely preserved

  19. An analysis of the lithic remains from several ring middens in Crockett County, Texas: A study in site function

    E-Print Network [OSTI]

    Moore, Bill

    1980-01-01T23:59:59.000Z

    AN ANALYSIS OF THE LITHIC REMAINS FROM SEVERAL RING MIDDENS IN CROCKETT COUNTY, TEXAS: A STUDY IN SITE FUNCTION A Thesis by WILLIAM EDWARD MOORE Submitted to the Graduate College of Texas AKIM University in partial fulfillment... of the requirements for the degree of MASTER OF ARTS May 1980 Major Subject: Anthropology AN ANALYSIS OF THE LITHIC REMAINS FROM SEVERAL RING MIDDENS IN CROCKETT COUNTY, TEXAS: A STUDY IN SITE FUNCTION A Thesis by WILLIAM EDWARD MOORE Approved as to style...

  20. Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56

    E-Print Network [OSTI]

    Marusa Bradac; Douglas Clowe; Anthony H. Gonzalez; Phil Marshall; William Forman; Christine Jones; Maxim Markevitch; Scott Randall; Tim Schrabback; Dennis Zaritsky

    2006-08-18T23:59:59.000Z

    The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction of the mass distribution from both strong and weak gravitational lensing data. Multi-color, high-resolution HST ACS images allow detection of many more arc candidates than were previously known, especially around the subcluster. Using the known redshift of one of the multiply imaged systems, we determine the remaining source redshifts using the predictive power of the strong lens model. Combining this information with shape measurements of "weakly" lensed sources, we derive a high-resolution, absolutely-calibrated mass map, using no assumptions regarding the physical properties of the underlying cluster potential. This map provides the best available quantification of the total mass of the central part of the cluster. We also confirm the result from Clowe et al. (2004,2006a).

  1. A New Weak Lensing Analysis of MS1224.7+2007

    E-Print Network [OSTI]

    Philippe Fischer

    1999-01-29T23:59:59.000Z

    Galaxy cluster mass distributions are useful probes of Omega_0 and the nature of the dark matter. Large clusters will distort the observed shapes of background galaxies through gravitational lensing allowing the measurement of the cluster mass distributions. For most cases, the agreement between weak lensing and radial velocity mass measurements of clusters is reasonably good. There is, however, one significant exception, the z=0.32 cluster MS1224.7+2007, which has a lensing mass substantially larger than the virial mass and also a very high mass-to-light ratio. Since this controversial object might be an unusually dark mass a follow-up study is definitely warranted. In this paper we study the mass and light distributions of MS1224+2007 out to a projected radius of 800/h kpc by measuring the gravitationally-induced distortions of background galaxies. We detect a shear signal in the background galaxies in the radial range 27.5 arcsec < r < 275 arcsec at the 5.5 sigma level. The resultant mass map exhibits a peak centered on the dominant cluster galaxy and strong evidence for substructure which is even more strongly seen in the galaxy distribution. Assuming all the detected shear is due to mass at z=0.32 we find cluster mass-to-light ratio of M/L_R = 640 +/- 150. The mass profile is quite flat compared to other clusters, disagreeing with a pseudo-singular isothermal sphere at the 95% confidence level. Our mass and M/L estimates are consistent with the previous weak lensing result. The discrepancy between the lensing and virial mass remains although it might be partially explained by subclustering and infall perpendicular to the line-of-site. This cluster remains a candidate dark object deficient in baryons and as such severely tests cosmological models.

  2. V-234: EMC RSA Archer GRC Open Redirection Weakness and Security...

    Energy Savers [EERE]

    4: EMC RSA Archer GRC Open Redirection Weakness and Security Bypass Security Issue V-234: EMC RSA Archer GRC Open Redirection Weakness and Security Bypass Security Issue September...

  3. Apparatus for determining past-service conditions and remaining life of thermal barrier coatings and components having such coatings

    DOE Patents [OSTI]

    Srivastava, Alok Mani (Niskayuna, NY); Setlur, Anant Achyut (Niskayuna, NY); Comanzo, Holly Ann (Niskayuna, NY); Devitt, John William (Clifton Park, NY); Ruud, James Anthony (Delmar, NY); Brewer, Luke Nathaniel (Rexford, NY)

    2004-05-04T23:59:59.000Z

    An apparatus for determining past-service conditions and/or remaining useful life of a component of a combustion engine and/or a thermal barrier coating ("TBC") of the component comprises a radiation source that provides the exciting radiation to the TBC to excite a photoluminescent ("PL") material contained therein, a radiation detector for detecting radiation emitted by the PL material, and means for relating a characteristic of an emission spectrum of the PL material to the amount of a crystalline phase in the TBC, thereby inferring the past-service conditions or the remaining useful life of the component or the TBC.

  4. Resurgence and Holomorphy: From Weak to Strong Coupling

    E-Print Network [OSTI]

    Aleksey Cherman; Peter Koroteev; Mithat Ünsal

    2014-12-18T23:59:59.000Z

    We analyze the resurgence properties of finite-dimensional exponential integrals which are prototypes for partition functions in quantum field theories. In these simple examples, we demonstrate that perturbation theory, even at arbitrarily weak coupling, fails as the argument of the coupling constant is varied. It is well-known that perturbation theory also fails at stronger coupling. We show that these two failures are actually intimately related. The formalism of resurgent transseries, which takes into account global analytic continuation properties, fixes both problems, and provides an arbitrarily accurate description of exact result for any value of coupling. This means that strong coupling results can be deduced by using merely weak coupling data. Finally, we give another perspective on resurgence theory by showing that the monodromy properties of the weak coupling results are in precise agreement with the monodromy properties of the strong-coupling expansions, obtained using analysis of the holomorphy structure of Picard-Fuchs equations.

  5. Dark Sectors and New, Light, Weakly-Coupled Particles

    E-Print Network [OSTI]

    Essig, R; Wester, W; Adrian, P Hansson; Andreas, S; Averett, T; Baker, O; Batell, B; Battaglieri, M; Beacham, J; Beranek, T; Bjorken, J D; Bossi, F; Boyce, J R; Cates, G D; Celentano, A; Chou, A S; Cowan, R; Curciarello, F; Davoudiasl, H; deNiverville, P; De Vita, R; Denig, A; Dharmapalan, R; Dongwi, B; Döbrich, B; Echenard, B; Espriu, D; Fegan, S; Fisher, P; Franklin, G B; Gasparian, A; Gershtein, Y; Graham, M; Graham, P W; Haas, A; Hatzikoutelis, A; Holtrop, M; Irastorza, I; Izaguirre, E; Jaeckel, J; Kahn, Y; Kalantarians, N; Kohl, M; Krnjaic, G; Kubarovsky, V; Lee, H-S; Lindner, A; Lobanov, A; Marciano, W J; Marsh, D J E; Maruyama, T; McKeen, D; Merkel, H; Moffeit, K; Monaghan, P; Mueller, G; Nelson, T K; Neil, G R; Oriunno, M; Pavlovic, Z; Phillips, S K; Pivovaroff, M J; Poltis, R; Pospelov, M; Rajendran, S; Redondo, J; Ringwald, A; Ritz, A; Ruz, J; Saenboonruang, K; Schuster, P; Shinn, M; Slatyer, T R; Steffen, J H; Stepanyan, S; Tanner, D B; Thaler, J; Tobar, M E; Toro, N; Upadye, A; Van de Water, R; Vlahovic, B; Vogel, J K; Walker, D; Weltman, A; Wojtsekhowski, B; Zhang, S; Zioutas, K

    2013-01-01T23:59:59.000Z

    Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark sectors, each with their own beautiful structure, distinct particles, and forces. This review summarizes the physics motivation for dark sectors and the exciting opportunities for experimental exploration. It is the summary of the Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" of the Community Summer Study 2013 (Snowmass). We discuss axions, which solve the strong CP problem and are an excellent dark matter candidate, and their generalization to axion-like particles. We also review dark photons and other dark-sector particles, including sub-GeV dark matter, which are theoretically natural, provide for dark matter candidates or new dark matter interactions, and could resolve outstanding puzzles in particle and astro-particle physics. In many cases, the explorat...

  6. Weak Measurement and Feedback in Superconducting Quantum Circuits

    E-Print Network [OSTI]

    K. W. Murch; R. Vijay; I. Siddiqi

    2015-07-16T23:59:59.000Z

    We describe the implementation of weak quantum measurements in superconducting qubits, focusing specifically on transmon type devices in the circuit quantum electrodynamics architecture. To access this regime, the readout cavity is probed with on average a single microwave photon. Such low-level signals are detected using near quantum-noise-limited superconducting parametric amplifiers. Weak measurements yield partial information about the quantum state, and correspondingly do not completely project the qubit into an eigenstate. As such, we use the measurement record to either sequentially reconstruct the quantum state at a given time, yielding a quantum trajectory, or to close a direct quantum feedback loop, stabilizing Rabi oscillations indefinitely.

  7. Proceedings: EPRI Workshop on Condition and Remaining Life Assessment of Hot Gas Path Components of Combustion Turbines

    SciTech Connect (OSTI)

    None

    2000-05-01T23:59:59.000Z

    The severity of modern combustion turbine operation is a reflection of industry competition to achieve higher thermal efficiency. This competitive stance has resulted in new turbine designs and material systems that have at times outpaced condition and remaining life assessment (CARLA) technology. These proceedings summarize a two-day workshop on CARLA technology for hot section components of large combustion turbines.

  8. Volume rendering at interactive frame rates remains a chal-lenge, especially with today's increasingly large datasets. We pro-

    E-Print Network [OSTI]

    Crawfis, Roger

    Abstract Volume rendering at interactive frame rates remains a chal- lenge, especially with today's increasingly large datasets. We pro- pose a framework, using concepts from Image-Based Rendering (IBR), that decreases the required framerate for the volume ren- derer significantly. All the volume renderer needs

  9. Volume rendering at interactive frame rates remains a chal-lenge, especially with today's increasingly large datasets. We pro-

    E-Print Network [OSTI]

    Mueller, Klaus

    1 Abstract Volume rendering at interactive frame rates remains a chal- lenge, especially with today's increasingly large datasets. We pro- pose a framework, using concepts from Image-Based Rendering (IBR), that decreases the required framerate for the volume ren- derer significantly. All the volume renderer needs

  10. of hydrogen-powered cars," he says. But a major hurdle remains: the cost of platinum metal

    E-Print Network [OSTI]

    of hydrogen-powered cars," he says. But a major hurdle remains: the cost of platinum metal needed to make fuel cells efficient. Fuel cells work by combining hydrogen gas with oxygen from the air for hydrogen-powered cars in mass production facilities," says SFU chemistry professor Steve Holdcroft, who

  11. eleCTriCAl AnD CoMPUTer engineering 31 foundation needed to remain effective,

    E-Print Network [OSTI]

    Bigelow, Stephen

    eleCTriCAl AnD CoMPUTer engineering · 31 foundation needed to remain effective, take on new fundamental areas of mathematics, science, and electrical engineering that are required to support specialized-the-art specialty areas in electrical engineering. This is implemented through our senior electives. Students

  12. A Joint Programme of: "Water will remain a strategic resource for countries worldwide, and the quest for water

    E-Print Network [OSTI]

    Chaudhuri, Sanjay

    the distinction between water as a resource and water as a service and thus lack the necessary institutionalA Joint Programme of: "Water will remain a strategic resource for countries worldwide, and the quest for water sustainability will become increasingly intricate and delicate. A keen understanding

  13. Job Postings The question was raised about the minimum time a position should remain posted before it

    E-Print Network [OSTI]

    Martinez, Tony R.

    Job Postings 121610 The question was raised about the minimum time a position should remain: EXTERNAL JOB POSTINGS1, 2 · Staff ­ one week minimum · Administrative ­ two weeks minimum · Faculty ­ two weeks minimum 1 The recruitment process for EXTERNAL job postings may be opened to: all

  14. First Determination of the Weak Charge of the Proton

    E-Print Network [OSTI]

    Balewski, Jan T.

    The Q[subscript weak] experiment has measured the parity-violating asymmetry in e? p elastic scattering at Q[superscript 2] = 0.025?(GeV/c)[superscript 2], employing 145???A of 89% longitudinally polarized electrons on a ...

  15. Weak Order Equivalence for Logic Programs with Preferences

    E-Print Network [OSTI]

    Schaub, Torsten

    Weak Order Equivalence for Logic Programs with Preferences Kathrin Konczak Institut f¨ur Informatik, notions of equivalence for Answer Set Programming have been stud- ied intensively and were shown to be beneficial for modular programming and automated optimization. In [9], the novel notion of strong equivalence

  16. Sound wave propagation in weakly polydisperse granular materials

    E-Print Network [OSTI]

    Luding, Stefan

    Sound wave propagation in weakly polydisperse granular materials O. Mouraille, S. Luding NSM/DCT/TUDelft, Julianalaan 136, 2628 BL Delft, Netherlands Abstract Dynamic simulations of wave propagation are performed. A small perturbation is created on one side of a static packing and its propagation, for both P- and S-waves

  17. Coupled S waves in inhomogeneous weakly anisotropic media

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    media. The new proce- dure can be used to compute S waves propagating in smooth inhomogeneous isotropicCoupled S waves in inhomogeneous weakly anisotropic media using first-order ray tracing V or anisotropic media. In isotropic media, it reduces to standard S-wave ray tracing. In anisotropic media, it can

  18. Enhancing entanglement trapping by weak measurement and quantum measurement reversal

    E-Print Network [OSTI]

    Ying-Jie Zhang; Wei Han; Heng Fan; Yun-Jie Xia

    2015-01-13T23:59:59.000Z

    In this paper, we propose a scheme to enhance trapping of entanglement of two qubits in the environment of a photonic band gap material. Our entanglement trapping promotion scheme makes use of combined weak measurements and quantum measurement reversals. The optimal promotion of entanglement trapping can be acquired with a reasonable finite success probability by adjusting measurement strengths.

  19. Higgs Production by Gluon initiated Weak Boson Fusion

    E-Print Network [OSTI]

    M. M. Weber

    2007-09-17T23:59:59.000Z

    The gluon-gluon induced terms for Higgs production through weak-boson fusion are calculated. They form a finite and gauge-invariant subset of the NNLO corrections in the strong coupling constant. This is also the lowest order with sizeable t-channel colour exchange contributions, leading to additional hadronic activity between the outgoing jets.

  20. Tachyon warm inflationary universe model in the weak dissipative regime

    E-Print Network [OSTI]

    Sergio del Campo; Ramon Herrera; Joel Saavedra

    2008-12-05T23:59:59.000Z

    Warm inflationary universe model in a tachyon field theory is studied in the weak dissipative regime. We develop our model for an exponential potential and the dissipation parameter $\\Gamma=\\Gamma_0$=constant. We describe scalar and tensor perturbations for this scenario.

  1. Weakly dispersive hydraulic flows in a contraction --Nonlinear stability analysis

    E-Print Network [OSTI]

    Ee, Bernard Kuowei

    Weakly dispersive hydraulic flows in a contraction -- Nonlinear stability analysis Bernard K. Ee hydraulic solutions of the forced Korteweg de-Vries equation is investigated here. For numerical convenience is destabilized by a hydraulic instability in which superexponential growth occurs prior to satura- tion

  2. ION BEAM MACHINING OF NIOBIUM WEAKLY SUPERCONDUCTING MICROBRIDGES

    E-Print Network [OSTI]

    Boyer, Edmond

    179 ION BEAM MACHINING OF NIOBIUM WEAKLY SUPERCONDUCTING MICROBRIDGES R. ADDE, P. CROZAT, S réduite représentant la structure à usiner. Les propriétés de microponts Josephson en niobium sont ensuite to be machin- ed. We describe and discuss the superconducting properties of niobium Josephson microbridges

  3. Periodic Orbits in Triaxial Galaxies with Weak Cusps

    E-Print Network [OSTI]

    Tema Fridman; David Merritt

    1997-05-19T23:59:59.000Z

    The orbital structure of triaxial models with weak central density cusps, $\\rho\\propto r^{-\\gamma}, gamma fish boxlets in the $x-z$ (long axis-short axis) plane are stable over a wide range of model parameters. The boxlets in the $x-y$ and $y-z$ planes are generally vertically unstable.

  4. Perturbations of Weakly Resonant Power System Electromechanical Modes

    E-Print Network [OSTI]

    instability. Index Terms-- power system dynamic stability, oscillations, resonance, root loci, eigenvalues of the system linearization and its associated eigenvector. Since the modes determine the power system stability1 Perturbations of Weakly Resonant Power System Electromechanical Modes Ian Dobson, Senior Member

  5. Early Results from the Q{sub weak} Experiment

    SciTech Connect (OSTI)

    Androic, D.; Armstrong, D.S.; Asaturyan, A.; Averett, T.; Balewski, J.; Beaufait, J.; Beminiwattha, R.S.; Benesch, J.; Benmokhtar, F.; Birchall, J.; Carlini, R.D.; Cates, G.D.; Cornejo, J.C.; Covrig, S.; Dalton, M.M.; Davis, C.A.; Deconinck, W.; Diefenbach, J.; Dowd, J.F.; Dunne, J.A.; Dutta, D.; Duvall, W.S.; Elaasar, M.; Falk, W.R.; Finn, J.M.; Forest, T.; Gaskel, D.; Gericke, M.T.W.; Grames, J.; Gray, V.M.; Grimm, K.; Guo, F.; Hoskins, J.R.; Johnston, K.; Jones, D.; Jones, M.; Jones, R.; Kargiantoulakis, M.; King, P.M.; Korkmaz, E.; Kowalski, S.; Leacock, J.; Leckey, J.; Lee, A.R.; Lee, J.H.; Lee, L.; MacEwan, S.; Mack, D.; Magee, J.A.; Mahurin, R.; Mammei, J.; Martin, J.; McHugh, M.J.; Meekins, D.; Mei, J.; Michaels, R.; Micherdzinska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Morgan, N.; Myers, K.E.; Narayan, A.; Ndukum, L.Z.; Nelyubin, V.; W T H, Nuruzzaman; Oers, van; Opper, A.K.; Page, S.A.; Pan, J.; Paschke, K.; Phillips, S.K.; Pitt, M.L.; Poelker, M.; Rajotte, J.F.; Ramsay, W.D.; Roche, J.; Sawatzky, B.; Seva, T.; Shabestari, M.H.; Silwal, R.; Simicevic, N.; Smith, G.R.; Solvignon, P.; Spayde, D.T.; Subedi, A.; Subedi, R.; Suleiman, R.; Tadevosyan, V.; Tobias, W.A.; Tvaskis, V.; Waidyawansa, B.; Wang, P.; Wells, S.P.; Wood, S.A.; Yang, S.; Young, R.D.; Zhamkochyan, S.

    2014-03-01T23:59:59.000Z

    A subset of results from the recently completed Jefferson Lab Q{sub weak} experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic {vector e}p scattering to provide the first determination of the protons weak charge Q{sub w}{sup p}. The experiment employed a 180 {micro}A longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q{sup 2} of 0.025 GeV{sup 2} were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Q{sub w}{sup p} to 4.2 percent (combined statistical and systematic error), which implies a measure of sin2(thetaw) at the level of 0.3 percent, and to help constrain the vector weak quark charges C{sub 1u} and C{sub 1d}. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH{sub 2} target. The new constraints on C{sub 1u} and C{sub 1d} provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron.

  6. Weak interactions of quarks and leptons: experimental status

    SciTech Connect (OSTI)

    Wojcicki, S.

    1984-09-01T23:59:59.000Z

    The present experimental status of weak interactions is discussed with emphasis on the problems and questions and on the possible lines of future investigations. Major topics include; (1) the quark mixing matrix, (2) CP violation, (3) rare decays, (4) the lepton sector, and (5) right handed currents. 118 references. (WHK)

  7. Weakly-Private Secret Sharing Schemes Amos Beimel1

    E-Print Network [OSTI]

    Beimel, Amos

    Weakly-Private Secret Sharing Schemes Amos Beimel1 and Matthew Franklin2 1 Department of Computer. Abstract. Secret-sharing schemes are an important tool in cryptogra- phy that is used in the construction of many secure protocols. However, the shares' size in the best known secret-sharing schemes realizing gen

  8. WILD POLYOMINO WEAK (1,2)-ACHIEVEMENT GAMES

    E-Print Network [OSTI]

    Sieben, Nándor

    WILD POLYOMINO WEAK (1,2)-ACHIEVEMENT GAMES N´andor Sieben Department of Mathematics, Northern cells at each move. A wild polyomino is a finite set of cells that are connected through an edge or through a corner. All wild polyominos on an infinite 2-dimensional rectangular board are characterized

  9. Lyapunov Exponents and Uniform Weak Normally Repelling Invariant Sets

    E-Print Network [OSTI]

    Smith, Hal

    Lyapunov Exponents and Uniform Weak Normally Repelling Invariant Sets Paul Leonard Salceanu and Hal repelling in directions normal to the boundary in which M resides provided all normal Lyapunov exponents that Lyapunov exponents can be used to establish the requisite repelling properties for both discrete

  10. Investigations of late archaic coprolites: pollen and macrofossil remains from Hinds Cave (41VV456), Val Verde County, Texas

    E-Print Network [OSTI]

    Edwards, Sherrian Kay

    1990-01-01T23:59:59.000Z

    KAY EDWARDS Approved as to style and content by: aughn M. Bryant, J (+air of Comm' te r &) Merrill H. Sweet (Member) p' Vaughn M. Br ant, J (Head of Department) May 1990 ABSTRACT Investigations of Late Archaic Coprolites: Pollen... and Macrofossil Remains from Hinds Cave (41VV456), Val Verde County, Texas. (May 1990) Sherrian Ray Edwards, B. A. , University of Texas Chair of Advisory Committee: Dr. Vaughn M. Bryant, Jr. The analysis of desiccated human fecal material (coprolites) left...

  11. Old Socorro Mission: an osteobiological analysis of the skeletal remains from the 1982-1985 field excavations

    E-Print Network [OSTI]

    Raisor, Michelle Jeanette

    1993-01-01T23:59:59.000Z

    . 119 Skull 38 exhibiting "saddle nose". 122 FIGURE Page 19 20 Cranial deformation of Burial 18. Bifid sacral hiatus of Burial 36. 126 129 21 Asymmetry of mandibular condyles (Burial 20). 132 22 Congenital absence of the left transverse process... River, it remained in constant use until A. D. 1829 when the church was severely damaged by flood waters and abandoned (Figure 1). Originally the small mission was built to administer to the Spanish families and the Piro Indians that accompanied...

  12. Remaining Sites Verification Package for 132-DR-1, 1608-DR Effluent Pumping Station, Waste Site Reclassification Form 2005-035

    SciTech Connect (OSTI)

    R. A. Carlson

    2005-09-22T23:59:59.000Z

    Radiological characterization, decommissioning and demolition of the 132-DR-1 site, 1608-DR Effluent Pumping Station was performed in 1987. The current site conditions achieve the remedial action objectives and the corresponding remedial action goals established in the Remaining Sites ROD. Residual concentrations support future land uses that can be represented by a rural-residential scenario and pose no threat to groundwater or the Columbia River based on RESRAD modeling.

  13. Weak and strong wave turbulence spectra for elastic thin plate

    E-Print Network [OSTI]

    Naoto Yokoyama; Masanori Takaoka

    2013-02-15T23:59:59.000Z

    Variety of statistically steady energy spectra in elastic wave turbulence have been reported in numerical simulations, experiments, and theoretical studies. Focusing on the energy levels of the system, we have performed direct numerical simulations according to the F\\"{o}ppl--von K\\'{a}rm\\'{a}n equation, and successfully reproduced the variability of the energy spectra by changing the magnitude of external force systematically. When the total energies in wave fields are small, the energy spectra are close to a statistically steady solution of the kinetic equation in the weak turbulence theory. On the other hand, in large-energy wave fields, another self-similar spectrum is found. Coexistence of the weakly nonlinear spectrum in large wavenumbers and the strongly nonlinear spectrum in small wavenumbers are also found in moderate energy wave fields.

  14. Sensitivity studies for the weak r process: neutron capture rates

    SciTech Connect (OSTI)

    Surman, R., E-mail: surmanr@union.edu [Department of Physics and Astronomy, Union College, Schenectady, NY 12308 (United States); Mumpower, M. [Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)] [Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States); Sinclair, R.; Jones, K. L. [Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996 (United States)] [Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996 (United States); Hix, W. R. [Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996 (United States) [Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996 (United States); Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States); McLaughlin, G. C. [Department of Physics, North Carolina State University, Raleigh, NC 27695 (United States)] [Department of Physics, North Carolina State University, Raleigh, NC 27695 (United States)

    2014-04-15T23:59:59.000Z

    Rapid neutron capture nucleosynthesis involves thousands of nuclear species far from stability, whose nuclear properties need to be understood in order to accurately predict nucleosynthetic outcomes. Recently sensitivity studies have provided a deeper understanding of how the r process proceeds and have identified pieces of nuclear data of interest for further experimental or theoretical study. A key result of these studies has been to point out the importance of individual neutron capture rates in setting the final r-process abundance pattern for a ‘main’ (A ? 130 peak and above) r process. Here we examine neutron capture in the context of a ‘weak’ r process that forms primarily the A ? 80 r-process abundance peak. We identify the astrophysical conditions required to produce this peak region through weak r-processing and point out the neutron capture rates that most strongly influence the final abundance pattern.

  15. Homotopy Theory of Strong and Weak Topological Insulators

    E-Print Network [OSTI]

    Ricardo Kennedy; Charles Guggenheim

    2014-09-08T23:59:59.000Z

    We use homotopy theory to extend the notion of strong and weak topological insulators to the non-stable regime (low numbers of occupied/empty energy bands). We show that for strong topological insulators in d spatial dimensions to be "truly d-dimensional", i.e. not realizable by stacking lower-dimensional insulators, a more restrictive definition of "strong" is required. However, this does not exclude weak topological insulators from being "truly d-dimensional", which we demonstrate by an example. Additionally, we prove some useful technical results, including the homotopy theoretic derivation of the factorization of invariants over the torus into invariants over spheres in the stable regime, as well as the rigorous justification of replacing $T^d$ by $S^d$ and $T^{d_k}\\times S^{d_x}$ by $S^{d_k+d_x}$ as is common in the current literature.

  16. Weak Gravity Strongly Constrains Large-Field Axion Inflation

    E-Print Network [OSTI]

    Ben Heidenreich; Matthew Reece; Tom Rudelius

    2015-06-10T23:59:59.000Z

    Models of large-field inflation based on axion-like fields with shift symmetries can be simple and natural, and make a promising prediction of detectable primordial gravitational waves. The Weak Gravity Conjecture is known to constrain the simplest case in which a single axion descends from a gauge field in an extra dimension. By supplementing the Weak Gravity Conjecture with considerations of how the mass spectrum of the theory varies across the axion moduli space, we obtain more powerful constraints that apply to a variety of multi-axion theories including N-flation and alignment models. In every case that we consider, plausible assumptions lead to field ranges that cannot be parametrically larger than the Planck scale. Our results are strongly suggestive of a general inconsistency in models of large-field inflation based on axions, and possibly of a more general principle forbidding super-Planckian field ranges.

  17. Constraints on Axion Inflation from the Weak Gravity Conjecture

    E-Print Network [OSTI]

    Rudelius, Tom

    2015-01-01T23:59:59.000Z

    We derive constraints facing models of axion inflation based on decay constant alignment from a string-theoretic and quantum gravitational perspective. In particular, we investigate the prospects for alignment and `anti-alignment' of $C_4$ axion decay constants in type IIB string theory, deriving a strict no-go result in the latter case. We discuss the relationship of axion decay constants to the weak gravity conjecture and demonstrate agreement between our string-theoretic constraints and those coming from the `generalized' weak gravity conjecture. Finally, we consider a particular model of decay constant alignment in which the potential of $C_4$ axions in type IIB compactifications on a Calabi-Yau three-fold is dominated by contributions from $D7$-branes, pointing out that this model evades some of the challenges derived earlier in our paper but is highly constrained by other geometric considerations.

  18. Weak Gravity Strongly Constrains Large-Field Axion Inflation

    E-Print Network [OSTI]

    Heidenreich, Ben; Rudelius, Tom

    2015-01-01T23:59:59.000Z

    Models of large-field inflation based on axion-like fields with shift symmetries can be simple and natural, and make a promising prediction of detectable primordial gravitational waves. The Weak Gravity Conjecture is known to constrain the simplest case in which a single axion descends from a gauge field in an extra dimension. By supplementing the Weak Gravity Conjecture with considerations of how the mass spectrum of the theory varies across the axion moduli space, we obtain more powerful constraints that apply to a variety of multi-axion theories including N-flation and alignment models. In every case that we consider, plausible assumptions lead to field ranges that cannot be parametrically larger than the Planck scale. Our results are strongly suggestive of a general inconsistency in models of large-field inflation based on axions, and possibly of a more general principle forbidding super-Planckian field ranges.

  19. The cause of the weak solar cycle 24

    E-Print Network [OSTI]

    Jiang, Jie; Schuessler, Manfred

    2015-01-01T23:59:59.000Z

    The ongoing 11-year cycle of solar activity is considerably less vigorous than the three cycles before. It was preceded by a very deep activity minimum with a low polar magnetic flux, the source of the toroidal field responsible for solar magnetic activity in the subsequent cycle. Simulation of the evolution of the solar surface field shows that the weak polar fields and thus the weakness of the present cycle 24 are mainly caused by a number of bigger bipolar regions emerging at low latitudes with a `wrong' (i.e., opposite to the majority for this cycle) orientation of their magnetic polarities in the North-South direction, which impaired the growth of the polar field. These regions had a particularly strong effect since they emerged within $\\pm10^\\circ$ latitude from the solar equator.

  20. Anomalous skin effects in a weakly magnetized degenerate electron plasma

    SciTech Connect (OSTI)

    Abbas, G., E-mail: gohar.abbas@gcu.edu.pk; Sarfraz, M. [Department of Physics, GC University Lahore, Katchery Road, Lahore 54000 (Pakistan); Shah, H. A. [Forman Christian College University, Farozpur Road, Lahore 54600 (Pakistan)

    2014-09-15T23:59:59.000Z

    Fully relativistic analysis of anomalous skin effects for parallel propagating waves in a weakly magnetized degenerate electron plasma is presented and a graphical comparison is made with the results obtained using relativistic Maxwellian distribution function [G. Abbas, M. F. Bashir, and G. Murtaza, Phys. Plasmas 18, 102115 (2011)]. It is found that the penetration depth for R- and L-waves for degenerate case is qualitatively small in comparison with the Maxwellian plasma case. The quantitative reduction due to weak magnetic field in the skin depth in R-wave for degenerate plasma is large as compared to the non-degenerate one. By ignoring the ambient magnetic field, previous results for degenerate field free case are salvaged [A. F. Alexandrov, A. S. Bogdankevich, and A. A. Rukhadze, Principles of Plasma Electrodynamics (Springer-Verlag, Berlin/Heidelberg, 1984), p. 90].

  1. Torsion-balance tests of the weak equivalence principle

    E-Print Network [OSTI]

    T. A. Wagner; S. Schlamminger; J. H. Gundlach; E. G. Adelberger

    2012-07-10T23:59:59.000Z

    We briefly summarize motivations for testing the weak equivalence principle and then review recent torsion-balance results that compare the differential accelerations of beryllium-aluminum and beryllium-titanium test body pairs with precisions at the part in $10^{13}$ level. We discuss some implications of these results for the gravitational properties of antimatter and dark matter, and speculate about the prospects for further improvements in experimental sensitivity.

  2. Constructive Dimension and Weak Truth-Table Degrees

    E-Print Network [OSTI]

    Doty, David

    dimension dimH(S) and constructive packing dimension dimP(S) is weak truth-table equivalent to a sequence R with dimH(R) dimH(S)/dimP(S) - , for arbitrary > 0. Furthermore, if dimP(S) > 0, then dimP(R) 1H(S) = dimP(S)) such that dimH(S) > 0, the wtt degree of S has constructive Hausdorff and packing dimension

  3. Effective Supergravity from the Weakly Coupled HeteroticString

    SciTech Connect (OSTI)

    Gaillard, Mary K.

    2005-05-01T23:59:59.000Z

    The motivation for Calabi-Yau-like compactifications of the weakly coupled E{sub 8} {circle_times} E{sub 8} heterotic string theory, its particle spectrum and the issue of dilaton stabilization are briefly reviewed. Modular invariant models for hidden sector condensation and supersymmetry breaking are described at the quantum level of the effective field theory. Their phenomenological and cosmological implications, including a possible origin for R-parity, are discussed.

  4. Relativistic description of weak decays of $B_s$ mesons

    E-Print Network [OSTI]

    R. N. Faustov; V. O. Galkin

    2014-11-26T23:59:59.000Z

    The branching fractions of the semileptonic and rare $B_s$ decays are calculated in the framework of the QCD-motivated relativistic quark model. The form factors of the weak $B_s$ transitions are expressed through the overlap integrals of the initial and final meson wave functions in the whole accessible kinematical range. The momentum transfer dependence of the form factors is explicitly determined without additional model assumptions and extrapolations. The obtained results agree well with available experimental data.

  5. Weakly screened thermonuclear reactions in astrophysical plasmas: Improving Salpeter's model

    E-Print Network [OSTI]

    Theodore E. Liolios

    2003-06-23T23:59:59.000Z

    This paper presents a detailed study of the electron degeneracy and nonlinear screening effects which play a crucial role in the validity of Salpeter's weak-screening model. The limitations of that model are investigated and an improved one is proposed which can take into account nonlinear screening effects. Its application to the solar pp reaction derives an accurate screening enhancement factor and provides a very reliable estimation of the associated neutrino flux uncertanties.

  6. Collective transport of weakly interacting molecular motors with Langmuir kinetics

    E-Print Network [OSTI]

    Sameep Chandel; Abhishek Chaudhuri; Sudipto Muhuri

    2015-01-09T23:59:59.000Z

    Filament based intracellular transport involves the collective action of molecular motor proteins. Experimental evidences suggest that microtubule (MT) filament bound motor proteins such as {\\it kinesins} weakly interact among themselves during transport and with the surrounding cellular environment. Motivated by these observations we study a driven lattice gas model for collective unidirectional transport of molecular motors on open filament, which incorporates the short-range interactions between the motors on filaments and couples the transport process on filament with surrounding cellular environment through adsorption-desorption Langmuir (LK) kinetics of the motors. We analyse this model within the framework of a Mean Field (MF) theory in the limit of {\\it weak} interactions between the motors. We point to the mapping of this model with the non-conserved version of Katz-Lebowitz-Spohn (KLS) model. The system exhibits rich phase behavior with variety of inhomogeneous phases including localized shocks in the bulk of the filament. We obtain the steady state density and current profiles and analyse their variation as function of the strength of interaction. We compare these MF results with Monte Carlo simulations and find that the MF analysis shows reasonably good agreement as long as the motors are weakly interacting. We also construct the non-equilibrium MF phase diagram.

  7. First Determination of the Weak Charge of the Proton

    SciTech Connect (OSTI)

    Androic, D; Armstrong, D S; Asaturyan, A; Averett, T; Balewski, J; Beaufait, J; Beminiwattha, R S; Benesch, J; Benmokhtar, F; Birchall, J; Carlini, R D [JLAB; Cates, G D; Cornejo, J C; Covrig, S; Dalton, M M; Davis, C A; Deconinck, W; Diefenbach, J; Dowd, J F; Dunne, J A; Dutta, D; Duvall, W S; Elaasar, M; Falk, W R; Finn, J M; Forest, T; Gaskell, D; Gericke, M T. W.; Grames, J; Gray, V M; Grimm, K; Guo, F; Hoskins, J R; Johnston, K; Jones, D; Jones, M; Jones, R; Kargiantoulakis, M; King, P M; Korkmaz, E; Kowalski, S; Leacock, J; Leckey, J; Lee, A R; Lee, J H; Lee, L; MacEwan, S; Mack, D; Magee, J A; Mahurin, R; Mammei, J; Martin, J W; McHugh, M J; Meekins, D; Mei, J; Michaels, R; Micherdzinska, A; Mkrtchyan, A; Mkrtchyan, H; Morgan, N; Myers, K E; Narayan, A; Ndukum, L Z; Nelyubin, V; van Oers, W T H; Nuruzzaman,; Opper, A K; Page, S A; Pan, J; Paschke, K D; Phillips, S K; Pitt, M L; Poelker, M; Rajotte, J F; Ramsay, W D; Roche, J; Sawatzky, B; Seva, T; Shabestari, M H; Silwal, R; Simicevic, N; Smith, G R; Solvignon, P; Spayde, D T; Subedi, A; Subedi, R; Suleiman, R; Tadevosyan, V; Tobias, W A; Tvaskis, V; Waidyawansa, B; Wang, P; Wells, S P; Wood, S A; Yang, S; Young, R D; Zhamkochyan, S

    2013-10-01T23:59:59.000Z

    The Qweak experiment has measured the parity-violating asymmetry in polarized e-p elastic scattering at Q^2 = 0.025(GeV/c)^2, employing 145 microamps of 89% longitudinally polarized electrons on a 34.4cm long liquid hydrogen target at Jefferson Lab. The results of the experiment's commissioning run are reported here, constituting approximately 4% of the data collected in the experiment. From these initial results the measured asymmetry is A_e_p = -279 +- 35 (statistics) +- 31 (systematics) ppb, which is the smallest and most precise asymmetry ever measured in polarized e-p scattering. The small Q^2 of this experiment has made possible the first determination of the weak charge of the proton, Q^p_W, by incorporating earlier parity-violating electron scattering (PVES) data at higher Q^2 to constrain hadronic corrections. The value of Q^p_W obtained in this way is Q^p_W(PVES) = 0.064 +- 0.012, in good agreement with the Standard Model prediction of Q^p_W(SM) = 0.0710 +- 0.0007. When this result is further combined with the Cs atomic parity violation (APV) measurement, significant constraints on the weak charges of the up and down quarks can also be extracted. That PVES+APV analysis reveals the neutron's weak charge to be Q^n_W(PVES+APV) = -0.975 +- 0.010.

  8. Turbulent Angular Momentum Transport in Weakly-Ionized Accretion Disks

    E-Print Network [OSTI]

    Bryan Mark Johnson

    2005-09-13T23:59:59.000Z

    Understanding the mechanism that drives accretion has been the primary challenge in accretion disk theory. Turbulence provides a natural means of dissipation and the removal of angular momentum, but firmly establishing its presence in disks proved for many years to be difficult. The realization in the 1990s that a weak magnetic field will destabilize a disk and result in a vigorous turbulent transport of angular momentum has revolutionized the field. Much of accretion disk research now focuses on understanding the implications of this mechanism for astrophysical observations. At the same time, the success of this mechanism depends upon a sufficient ionization level in the disk for the flow to be well-coupled to the magnetic field. Many disks, such as disks around young stars and disks in binary systems that are in quiescence, are too cold to be sufficiently ionized, and so efforts to establish the presence of turbulence in these disks continues. This dissertation focuses on several possible mechanisms for the turbulent transport of angular momentum in weakly-ionized accretion disks: gravitational instability, radial convection and vortices driving compressive motions. It appears that none of these mechanisms are very robust in driving accretion. A discussion is given, based on these results, as to the most promising directions to take in the search for a turbulent transport mechanism that does not require magnetic fields. Also discussed are the implications of assuming that no turbulent transport mechanism exists for weakly-ionized disks.

  9. THE SUB-SUPERSOLUTION METHOD FOR WEAK SOLUTIONS MARCELO MONTENEGRO AND AUGUSTO C. PONCE

    E-Print Network [OSTI]

    Ponce, Augusto

    THE SUB-SUPERSOLUTION METHOD FOR WEAK SOLUTIONS MARCELO MONTENEGRO AND AUGUSTO C. PONCE Abstract; weak solutions. 1 #12;2 MARCELO MONTENEGRO AND AUGUSTO C. PONCE (i) u L1 (); (ii) f(·, u)0 L1

  10. Remote Methodology used at B Plant Hanford to Map High Radiation and Contamination Fields and Document Remaining Hazards

    SciTech Connect (OSTI)

    SIMMONS, F.M.

    2000-01-01T23:59:59.000Z

    A remote radiation mapping system using the Gammacam{trademark} (AIL Systems Inc. Trademark) with real-time response was used in deactivating the B Plant at Hanford to produce digitized images showing actual radiation fields and dose rates. Deployment of this technology has significantly reduced labor requirements, decreased personnel exposure, and increased the accuracy of the measurements. Personnel entries into the high radiation/contamination areas was minimized for a dose savings of 30 Rem (.3 Seivert) and a cost savings of $640K. In addition, the data gathered was utilized along with historical information to estimate the amount of remaining hazardous waste in the process cells. The B Plant facility is a canyon facility containing 40 process cells which were used to separate cesium and strontium from high level waste. The cells and vessels are contaminated with chemicals used in the separation and purification processes. Most of the contaminants have been removed but the residual contamination from spills in the cells and heels in the tanks contribute to the localized high radioactivity. The Gammacam{trademark} system consists of a high density terbium-activated scintillating glass detector coupled with a digitized video camera. Composite images generated by the system are presented in pseudo color over a black and white image. Exposure times can be set from 10 milliseconds to 1 hour depending on the field intensity. This information coupled with process knowledge is then used to document the hazardous waste remaining in each cell. Additional uses for this radiation mapping system would be in support of facilities stabilization and deactivation activities at Hanford or other DOE sites. The system is currently scheduled for installation and mapping of the U Plant in 1999. This system is unique due to its portability and its suitability for use in high dose rate areas.

  11. Weak and strong chaos in FPU models and beyond

    E-Print Network [OSTI]

    Marco Pettini; Lapo Casetti; Monica Cerruti-Sola; Roberto Franzosi; E. G. D. Cohen

    2004-10-12T23:59:59.000Z

    We briefly review some of the most relevant results that our group obtained in the past, while investigating the dynamics of the Fermi-Pasta-Ulam (FPU) models. A first result is the numerical evidence of the existence of two different kinds of transitions in the dynamics of the FPU models: i) a Stochasticity Threshold (ST), characterized by a value of the energy per degree of freedom below which the overwhelming majority of the phase space trajectories are regular (vanishing Lyapunov exponents). It tends to vanish as the number N of degrees of freedom is increased. ii) a Strong Stochasticity Threshold (SST), characterized by a value of the energy per degree of freedom at which a crossover appears between two different power laws of the energy dependence of the largest Lyapunov exponent, which phenomenologically corresponds to the transition between weakly and strongly chaotic regimes. It is stable with N. A second result is the development of a Riemannian geometric theory to explain the origin of Hamiltonian chaos. The starting of this theory has been motivated by the inadequacy of the approach based on homoclinic intersections to explain the origin of chaos in systems of arbitrarily large N, or arbitrarily far from quasi-integrability, or displaying a transition between weak and strong chaos. Finally, a third result stems from the search for the transition between weak and strong chaos in systems other than FPU. Actually, we found that a very sharp SST appears as the dynamical counterpart of a thermodynamic phase transition, which in turn has led, in the light of the Riemannian theory of chaos, to the development of a topological theory of phase transitions.

  12. WEAK BIALGEBRAS AND MONOIDAL CATEGORIES G. BOHM, S. CAENEPEEL, AND K. JANSSEN

    E-Print Network [OSTI]

    Caenepeel, Stefaan

    functor HM kM is strongly monoidal. Weak bialgebras are more general than bialgebras. The axioms (1) = 11

  13. Semiclassical suppression of weak anisotropies of a generic Universe

    E-Print Network [OSTI]

    Marco Valerio Battisti; Riccardo Belvedere; Giovanni Montani

    2009-06-11T23:59:59.000Z

    A semiclassical mechanism which suppresses the weak anisotropies of an inhomogeneous cosmological model is developed. In particular, a wave function of this Universe having a meaningful probabilistic interpretation is obtained that is in agreement with the Copenhagen School. It describes the evolution of the anisotropies with respect to the isotropic scale factor which is regarded as a semiclassical variable playing an observer-like role. Near the cosmological singularity the solution spreads over all values of the anisotropies while, when the Universe expands sufficiently, the closed Friedmann-Robertson-Walker model appears to be the favorite state.

  14. Measurement of the Proton's Neutral Weak Magnetic Form Factor

    E-Print Network [OSTI]

    B. Mueller; D. H. Beck; E. J. Beise; E. Candell; L. Cardman; R. Carr; R. C. DiBari; G. Dodson; K. Dow; F. Duncan; M. Farkhondeh; B. W. Filippone; T. Forest; H. Gao; W. Korsch; S. Kowalski; A. Lung; R. D. McKeown; R. Mohring; J. Napolitano; D. Nilsson; M. Pitt; N. Simicevic; B. Terburg; S. P. Wells

    1997-02-26T23:59:59.000Z

    We report the first measurement of the parity-violating asymmetry in elastic electron scattering from the proton. The asymmetry depends on the neutral weak magnetic form factor of the proton which contains new information on the contribution of strange quark-antiquark pairs to the magnetic moment of the proton. We obtain the value $G_M^Z= 0.34 \\pm 0.09 \\pm 0.04 \\pm 0.05$ n.m. at $Q^2=0.1$ (GeV/c)${}^2$.

  15. Utilizing weak pump depletion to stabilize squeezed vacuum states

    E-Print Network [OSTI]

    Timo Denker; Dirk Schütte; Maximilian H. Wimmer; Trevor A. Wheatley; Elanor H. Huntington; Michèle Heurs

    2015-03-10T23:59:59.000Z

    We propose and demonstrate a pump-phase locking technique that makes use of weak pump depletion (WPD) - an unavoidable effect that is usually neglected - in a sub-threshold optical parametric oscillator (OPO). We show that the phase difference between seed and pump beam is imprinted on both light fields by the non-linear interaction in the crystal and can be read out without disturbing the squeezed output. Our new locking technique allows for the first experimental realization of a pump-phase lock by reading out the pre-existing phase information in the pump field. There is no degradation of the detected squeezed states required to implement this scheme.

  16. Axions, strong and weak CP, and KNP inflation

    E-Print Network [OSTI]

    Kim, Jihn E

    2015-01-01T23:59:59.000Z

    I review the ideas leading to the QCD axion and also comment on the Jarlskog determinant describing the observed weak CP violation, and the axion-related Kim-Nilles-Peloso inflation. All of these use pseudoscalars, and the underlying principle is the discrete gauge symmetry either in the bottom-up or top-down approaches. Here, the effects of gravity are required to be unimportant in the low energy effective theory. String compactification is safe from the gravity spoil of global symmetries and some examples from string compactification are commented.

  17. Linear and nonlinear wave propagation in weakly relativistic quantum plasmas

    SciTech Connect (OSTI)

    Stefan, Martin; Brodin, Gert [Department of Physics, Umea University, SE-901 87 Umea (Sweden)

    2013-01-15T23:59:59.000Z

    We consider a recently derived kinetic model for weakly relativistic quantum plasmas. We find that that the effects of spin-orbit interaction and Thomas precession may alter the linear dispersion relation for a magnetized plasma in case of high plasma densities and/or strong magnetic fields. Furthermore, the ponderomotive force induced by an electromagnetic pulse is studied for an unmagnetized plasma. It turns out that for this case the spin-orbit interaction always gives a significant contribution to the quantum part of the ponderomotive force.

  18. Signatures of quantum behavior in single-qubit weak measurements

    E-Print Network [OSTI]

    Rusko Ruskov; Alexander N. Korotkov; Ari Mizel

    2005-09-30T23:59:59.000Z

    With the recent surge of interest in quantum computation, it has become very important to develop clear experimental tests for ``quantum behavior'' in a system. This issue has been addressed in the past in the form of the inequalities due to Bell and those due to Leggett and Garg. These inequalities concern the results of ideal projective measurements, however, which are experimentally difficult to perform in many proposed qubit designs, especially in many solid state qubit systems. Here, we show that weak continuous measurements, which are often practical to implement experimentally, can yield particularly clear signatures of quantum coherence, both in the measured correlation functions and in the measured power spectrum.

  19. Coherent state of a weakly interacting ultracold Fermi gas

    E-Print Network [OSTI]

    Arnab Ghosh; Sudarson Sekhar Sinha; Deb Shankar Ray

    2013-04-04T23:59:59.000Z

    We examine the weakly interacting atoms in an ultracold Fermi gas leading to a state of macroscopic coherence, from a theoretical perspective. It has been shown that this state can be described as a fermionic coherent state. These coherent states are the eigenstates of fermionic annihilation operators, the eigenvalues being anti-commuting numbers or Grassmann numbers. By exploiting the simple rules of Grassmann algebra and a close kinship between relations evaluated for more familiar bosonic fields and those for fermionic fields, we derive the thermodynamic limit, the spontaneous symmetry breaking and the quasi-particle spectrum of the fermionic system.

  20. Evidence for a Weak Iron Core at Earth's Center

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField8,Dist. Category UC-l 1, 13Evacuation248 EvaluationMAYEvidence for a Weak

  1. Tsung-Dao Lee, Weak Interactions, and Nonconservation of Parity

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del SolStrengthening a solidSynthesisAppliancesTrending:ScheduleTsung-Dao Lee, Weak

  2. Proton's Weak Charge Determined for First Time | Jefferson Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah47,193.70 HgPromisingProtectingSciTechProton DrippingWeak Charge

  3. Construction of suitable weak solutions for the 3D incompressible NSEs

    E-Print Network [OSTI]

    Guermond, Jean-Luc

    Construction of suitable weak solutions for the 3D incompressible NSEs Jean-Luc Guermond Department-Luc Guermond Construction of suitable weak solutions for the 3D NSEs #12;Outline 1 BASIC FACTS ABOUT THE 3D NSE Jean-Luc Guermond Construction of suitable weak solutions for the 3D NSEs #12;Outline 1 BASIC FACTS

  4. Construction of suitable weak solutions for the 3D incompressible NSEs

    E-Print Network [OSTI]

    Guermond, Jean-Luc

    Construction of suitable weak solutions for the 3D incompressible NSEs Jean-Luc Guermond Department Univ. October 24, 2008 Jean-Luc Guermond Construction of suitable weak solutions for the 3D NSEs #12;Outline 1 BASIC FACTS ABOUT THE 3D NSE Jean-Luc Guermond Construction of suitable weak solutions for the 3

  5. Recap Weak Normal EC Strong Normal EC Robustness Combined with WCT Equivalence Class Testing

    E-Print Network [OSTI]

    Mousavi, Mohammad

    Recap Weak Normal EC Strong Normal EC Robustness Combined with WCT Equivalence Class Testing: Equivalence Class Testing #12;Recap Weak Normal EC Strong Normal EC Robustness Combined with WCT Outline Recap Weak Normal EC Strong Normal EC Robustness Combined with WCT Mousavi: Equivalence Class Testing #12

  6. Weak-Key Analysis of POET Mohamed Ahmed Abdelraheem, Andrey Bogdanov, and Elmar Tischhauser

    E-Print Network [OSTI]

    Weak-Key Analysis of POET Mohamed Ahmed Abdelraheem, Andrey Bogdanov, and Elmar Tischhauser,anbog,ewti}@dtu.dk Abstract. We evaluate the security of the recently proposed authenticated encryption scheme POET. We give explicit constructions for weak key classes not covered by POET's weak key testing strategy

  7. Weakly Uniformly Rotund Banach spaces A. Molto, V. Montesinos, J. Orihuela and S. Troyanski

    E-Print Network [OSTI]

    Montesinos Santalucía, Vicente

    are equivalent: 1. C(K) is weakly K-analytic. 2. There is an increasing mapping S from ININ (endowed, such that {S : ININ } separates points of K. Remark 1 In [1] the validity of the previous theorem that (W, weak) is K-analytic if and only if W = {S : ININ } and every S is weakly compact

  8. Revealing strengths and weaknesses of methods for gene network inference

    E-Print Network [OSTI]

    Floreano, Dario

    -performing method failed to accu- rately infer multiple regulatory inputs (combinatorial regulation) of genes MDM2, its key regulator (1). Indeed, the map- ping of biological interactions in the intracellular realm remains the bottleneck in the pipeline to produce biological knowledge from high-throughput data

  9. How the Weak Variance of Momentum Can Turn Out to be Negative

    E-Print Network [OSTI]

    M. R. Feyereisen

    2015-03-25T23:59:59.000Z

    Weak values are average quantities,therefore investigating their associated variance is crucial in understanding their place in quantum mechanics. We develop the concept of a position-postselected weak variance of momentum as cohesively as possible, building primarily on material from Moyal (Mathematical Proceedings of the Cambridge Philosophical Society, Cambridge University Press, Cambridge, 1949) and Sonego (Found Phys 21(10):1135, 1991) . The weak variance is defined in terms of the Wigner function, using a standard construction from probability theory. We show this corresponds to a measurable quantity, which is not itself a weak value. It also leads naturally to a connection between the imaginary part of the weak value of momentum and the quantum potential. We study how the negativity of the Wigner function causes negative weak variances, and the implications this has on a class of `subquantum' theories. We also discuss the role of weak variances in studying determinism, deriving the classical limit from a variational principle.

  10. How the Weak Variance of Momentum Can Turn Out to be Negative

    E-Print Network [OSTI]

    Feyereisen, M R

    2015-01-01T23:59:59.000Z

    Weak values are average quantities,therefore investigating their associated variance is crucial in understanding their place in quantum mechanics. We develop the concept of a position-postselected weak variance of momentum as cohesively as possible, building primarily on material from Moyal (Mathematical Proceedings of the Cambridge Philosophical Society, Cambridge University Press, Cambridge, 1949) and Sonego (Found Phys 21(10):1135, 1991) . The weak variance is defined in terms of the Wigner function, using a standard construction from probability theory. We show this corresponds to a measurable quantity, which is not itself a weak value. It also leads naturally to a connection between the imaginary part of the weak value of momentum and the quantum potential. We study how the negativity of the Wigner function causes negative weak variances, and the implications this has on a class of `subquantum' theories. We also discuss the role of weak variances in studying determinism, deriving the classical limit from...

  11. Strong and Weak Lensing United III: Measuring the Mass Distribution of the Merging Galaxy Cluster 1E0657-56

    SciTech Connect (OSTI)

    Bradac, Marusa; Clowe, Douglas; Gonzalez, Anthony H.; Marshall, Phil; Forman, William; Jones, Christine; Markevitch, Maxim; Randall, Scott; Schrabback, Tim; Zaritsky,; /KIPAC, Menlo Park /Bonn, Inst. Astrophys. /Arizona U., Astron. Dept. - Steward Observ. /Florida U. /Harvard-Smithsonian Ctr. Astrophys.

    2006-09-27T23:59:59.000Z

    The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction of the mass distribution from both strong and weak gravitational lensing data. Multi-color, high-resolution HST ACS images allow detection of many more arc candidates than were previously known, especially around the subcluster. Using the known redshift of one of the multiply imaged systems, we determine the remaining source redshifts using the predictive power of the strong lens model. Combining this information with shape measurements of ''weakly'' lensed sources, we derive a high-resolution, absolutely-calibrated mass map, using no assumptions regarding the physical properties of the underlying cluster potential. This map provides the best available quantification of the total mass of the central part of the cluster. We also confirm the result from Clowe et al. (2004, 2006a) that the total mass does not trace the baryonic mass.

  12. Weakly interacting Bose gas in a random environment 

    E-Print Network [OSTI]

    Falco, G. M.; Nattermann, T.; Pokrovsky, Valery L.

    2009-01-01T23:59:59.000Z

    - ization transition remains beyond the frameworks of the theory. The metal-insulator transition in two dimensions was observed in experiments9 suggesting the decisive role of in- teraction. The physical picture changes drastically for bosons.... The noninteracting bosons condense at a single-particle state with the lowest energy. In a homogeneous system it leads to a coherent quantum state known as the Bose-Einstein conden- sate #1;BEC#2;. Examples are superfluid phases of He,10 superconductors,11 BEC...

  13. Buoyancy Instabilities in a Weakly Collisional Intracluster Medium

    E-Print Network [OSTI]

    Kunz, Matthew W; Reynolds, Christopher S; Stone, James M

    2012-01-01T23:59:59.000Z

    The intracluster medium of galaxy clusters is a weakly collisional, high-beta plasma in which the transport of heat and momentum occurs primarily along magnetic-field lines. Anisotropic heat conduction allows convective instabilities to be driven by temperature gradients of either sign, the magnetothermal instability (MTI) in the outskirts of non-isothermal clusters and the heat-flux buoyancy-driven instability (HBI) in their cooling cores. We employ the Athena MHD code to investigate the nonlinear evolution of these instabilities, self-consistently including the effects of anisotropic viscosity (i.e. Braginskii pressure anisotropy), anisotropic conduction, and radiative cooling. We highlight the importance of the microscale instabilities that inevitably accompany and regulate the pressure anisotropies generated by the HBI and MTI. We find that, in all but the innermost regions of cool-core clusters, anisotropic viscosity significantly impairs the ability of the HBI to reorient magnetic-field lines orthogonal...

  14. Weak-strong clustering transition in renewing compressible flows

    E-Print Network [OSTI]

    Ajinkya Dhanagare; Stefano Musacchio; Dario Vincenzi

    2014-11-01T23:59:59.000Z

    We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.

  15. Quasielastic electron-deuteron scattering in the weak binding approximation

    SciTech Connect (OSTI)

    Ethier, Jacob J. [William and Mary College, JLAB; Doshi, Nidhi P. [Carnegie Mellon University; Malace, Simona P. [JLAB; Melnitchouk, Wally [JLAB

    2014-06-01T23:59:59.000Z

    We perform a global analysis of all available electron-deuteron quasielastic scattering data using Q^2-dependent smearing functions that describe inclusive inelastic e-d scattering within the weak binding approximation. We study the dependence of the cross sections on the deuteron wave function and the off-shell extrapolation of the elastic electron-nucleon cross section, which show particular sensitivity at x >> 1. The excellent overall agreement with data over a large range of Q^2 and x suggest a limited need for effects beyond the impulse approximation, with the exception of the very high-x or very low-Q^2 regions, where short-distance effects in the deuteron become more relevant.

  16. Multiphase weakly nonlinear geometric optics for Schrodinger equations

    E-Print Network [OSTI]

    Rémi Carles; Eric Dumas; Christof Sparber

    2009-02-17T23:59:59.000Z

    We describe and rigorously justify the nonlinear interaction of highly oscillatory waves in nonlinear Schrodinger equations, posed on Euclidean space or on the torus. Our scaling corresponds to a weakly nonlinear regime where the nonlinearity affects the leading order amplitude of the solution, but does not alter the rapid oscillations. We consider initial states which are superpositions of slowly modulated plane waves, and use the framework of Wiener algebras. A detailed analysis of the corresponding nonlinear wave mixing phenomena is given, including a geometric interpretation on the resonance structure for cubic nonlinearities. As an application, we recover and extend some instability results for the nonlinear Schrodinger equation on the torus in negative order Sobolev spaces.

  17. The Weak-Coupling Limit of Simplicial Quantum Gravity

    E-Print Network [OSTI]

    G. Thorleifsson; P. Bialas; B. Petersson

    1998-12-23T23:59:59.000Z

    In the weak-coupling limit, kappa_0 going to infinity, the partition function of simplicial quantum gravity is dominated by an ensemble of triangulations with the ratio N_0/N_D close to the upper kinematic limit. For a combinatorial triangulation of the D--sphere this limit is 1/D. Defining an ensemble of maximal triangulations, i.e. triangulations that have the maximal possible number of vertices for a given volume, we investigate the properties of this ensemble in three dimensions using both Monte Carlo simulations and a strong-coupling expansion of the partition function, both for pure simplicial gravity and a with a suitable modified measure. For the latter we observe a continuous phase transition to a crinkled phase and we investigate the fractal properties of this phase.

  18. Absolute Dynamical Limit to Cooling Weakly-Coupled Quantum Systems

    E-Print Network [OSTI]

    X. Wang; Sai Vinjanampathy; Frederick W. Strauch; Kurt Jacobs

    2012-05-15T23:59:59.000Z

    Cooling of a quantum system is limited by the size of the control forces that are available (the "speed" of control). We consider the most general cooling process, albeit restricted to the regime in which the thermodynamics of the system is preserved (weak coupling). Within this regime, we further focus on the most useful control regime, in which a large cooling factor, and good ground-state cooling can be achieved. We present a control protocol for cooling, and give clear structural arguments, as well as strong numerical evidence, that this protocol is globally optimal. From this we obtain simple expressions for the limit to cooling that is imposed by the speed of control.

  19. Weak-strong clustering transition in renewing compressible flows

    E-Print Network [OSTI]

    Dhanagare, Ajinkya; Vincenzi, Dario

    2014-01-01T23:59:59.000Z

    We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.

  20. Can weakly nonlinear theory explain Faraday wave patterns near onset?

    E-Print Network [OSTI]

    Skeldon, A C

    2015-01-01T23:59:59.000Z

    The Faraday problem is an important pattern-forming system that provides some middle ground between systems where the initial instability involves just a single mode and in which complexity then results from mode interactions or secondary bifurcations, and cases where a system is highly turbulent and many spatial and temporal modes are excited. It has been a rich source of novel patterns and of theoretical work aimed at understanding how and why such patterns occur. Yet it is particularly challenging to tie theory to experiment: the experiments are difficult to perform; the parameter regime of interest (large box, moderate viscosity) along with the technical difficulties of solving the free boundary Navier--Stokes equations make numerical solution of the problem hard; and the fact that the instabilities result in an entire circle of unstable wavevectors presents considerable theoretical difficulties. In principle, weakly nonlinear theory should be able to predict which patterns are stable near pattern onset. ...

  1. Dynamics of vortices in weakly interacting Bose-Einstein condensates

    E-Print Network [OSTI]

    Alexander Klein; Dieter Jaksch; Yanzhi Zhang; Weizhu Bao

    2007-10-03T23:59:59.000Z

    We study the dynamics of vortices in ideal and weakly interacting Bose-Einstein condensates using a Ritz minimization method to solve the two-dimensional Gross-Pitaevskii equation. For different initial vortex configurations we calculate the trajectories of the vortices. We find conditions under which a vortex-antivortex pair annihilates and is created again. For the case of three vortices we show that at certain times two additional vortices may be created, which move through the condensate and annihilate each other again. For a noninteracting condensate this process is periodic, whereas for small interactions the essential features persist, but the periodicity is lost. The results are compared to exact numerical solutions of the Gross-Pitaevskii equation confirming our analytical findings.

  2. Session 35 - Panel: Remaining US Disposition Issues for Orphan or Small Volume Low Level and Low Level Mixed Waste Streams

    SciTech Connect (OSTI)

    Blauvelt, Richard [Navarro Engineering Research Inc. (United States); Small, Ken [Doe Nevada (United States); Gelles, Christine [DOE EM HQ (United States); McKenney, Dale [Fluor Hanford (United States); Franz, Bill [LATA Portsmouth (United States); Loveland, Kaylin [Energy Solutions Inc. (United States); Lauer, Mike [Waste Control Specialists (United States)

    2006-07-01T23:59:59.000Z

    Faced with closure schedules as a driving force, significant progress has been made during the last 2 years on the disposition of DOE mixed waste streams thought previously to be problematic. Generators, the Department of Energy and commercial vendors have combined to develop unique disposition paths for former orphan streams. Recent successes and remaining issues will be discussed. The session will also provide an opportunity for Federal agencies to share lessons learned on low- level and mixed low-level waste challenges and identify opportunities for future collaboration. This panel discussion was organized by PAC member Dick Blauvelt, Navarro Research and Engineering Inc who served as co-chair along with Dave Eaton from INL. In addition, George Antonucci, Duratek Barnwell and Rich Conley, AFSC were invited members of the audience, prepared to contribute the Barnwell and DOD perspective to the issues as needed. Mr. Small provide information regarding the five year 20K M3 window of opportunity at the Nevada Test Site for DOE contractors to dispose of mixed waste that cannot be received at the Energy Solutions (Envirocare) site in Utah because of activity levels. He provided a summary of the waste acceptance criteria and the process sites must follow to be certified to ship. When the volume limit or time limit is met, the site will undergo a RCRA closure. Ms. Gelles summarized the status of the orphan issues, commercial options and the impact of the EM reorganization on her program. She also announced that there would be a follow-on meeting in 2006 to the very successful St. Louis meeting of last year. It will probably take place in Chicago in July. Details to be announced. Mr. McKenney discussed progress made at the Hanford Reservation regarding disposal of their mixed waste inventory. The news is good for the Hanford site but not good for the rest of the DOE complex since shipment for out of state of both low level and low level mixed waste will continue to be prohibited until the completion of a new NEPA study. This is anticipated to take several years. Bill Franz from Portsmouth and Dave Eaton representing the INL provided the audience with information regarding some of the problematic mixed waste streams at their respective sites. Portsmouth has some unique radiological issues with isotopes such as Tc-99 while the INL is trying to deal with mixed waste in the 10-100 nCi/g range. Kaylin Loveland spoke of the new,Energy Solutions organization and provided information on mixed waste treatment capabilities at the Clive site. Mike Lauer described the licensing activities at the WCS site in Texas where they are trying to eventually have disposal capabilities for Class A, B and C mixed waste from both DOE and the commercial sector. The audience included about 75 WM'06 attendees who asked some excellent questions and provided an active and informative exchange of information on the topic. (authors)

  3. Practical measurement of joint weak values and their connection to the annihilation operator

    E-Print Network [OSTI]

    J. S. Lundeen; K. J. Resch

    2005-01-13T23:59:59.000Z

    Weak measurements are a new tool for characterizing post-selected quantum systems during their evolution. Weak measurement was originally formulated in terms of von Neumann interactions which are practically available for only the simplest single-particle observables. In the present work, we extend and greatly simplify a recent, experimentally feasible, reformulation of weak measurement for multiparticle observables [Resch and Steinberg (2004, Phys. Rev. Lett., 92, 130402)]. We also show that the resulting ``joint weak values'' take on a particularly elegant form when expressed in terms of annihilation operators.

  4. The $N-?$ Weak Axial-Vector Amplitude $C_{5}^a(0)$

    E-Print Network [OSTI]

    Milton Dean Slaughter

    1999-03-01T23:59:59.000Z

    The weak $N-\\Delta$ axial-vector transition amplitude $$ - important in $N^{*}$ production processes in general and in isobar models describing $\

  5. Perpendicular propagating modes for weakly magnetized relativistic degenerate plasma

    SciTech Connect (OSTI)

    Abbas, Gohar; Bashir, M. F. [Salam Chair in Physics, G. C. University Lahore, Punjab 54000 (Pakistan); Department of Physics, G. C. University Lahore, Punjab 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G. C. University Lahore, Punjab 54000 (Pakistan)

    2012-07-15T23:59:59.000Z

    Using the Vlasov-Maxwell system of equations, the dispersion relations for the perpendicular propagating modes (i.e., X-mode, O-mode, and upper hybrid mode) are derived for a weakly magnetized relativistic degenerate electron plasma. By using the density (n{sub 0}=p{sub F}{sup 3}/3{pi}{sup 2} Planck-Constant-Over-Two-Pi {sup 3}) and the magnetic field values for different relativistic degenerate environments, the propagation characteristics (i.e., cutoff points, resonances, dispersions, and band widths in k-space) of these modes are examined. It is observed that the relativistic effects suppress the effect of ambient magnetic field and therefore the cutoff and resonance points shift towards the lower frequency regime resulting in enhancement of the propagation domain. The dispersion relations of these modes for the non-relativistic limit (p{sub F}{sup 2} Much-Less-Than m{sub 0}{sup 2}c{sup 2}) and the ultra-relativistic limit (p{sub F}{sup 2} Much-Greater-Than m{sub 0}{sup 2}c{sup 2}) are also presented.

  6. Physical component analysis of galaxy cluster weak gravitational lensing data

    E-Print Network [OSTI]

    Phil Marshall

    2007-10-30T23:59:59.000Z

    We present a novel approach for reconstructing the projected mass distribution of clusters of galaxies from sparse and noisy weak gravitational lensing shear data. The reconstructions are regularised using knowledge gained from numerical simulations of clusters: trial mass distributions are constructed from N physically-motivated components, each of which has the universal density profile and characteristic geometry observed in simulated clusters. The parameters of these components are assumed to be distributed \\emph{a priori} in the same way as they are in the simulated clusters. Sampling mass distributions from the components' parameters' posterior probability density function allows estimates of the mass distribution to be generated, with error bars. The appropriate number of components is inferred from the data itself via the Bayesian evidence, and is typically found to be small, reflecting the quality of the simulated data used in this work. Ensemble average mass maps are found to be robust to the details of the noise realisation, and succeed in recovering the input mass distribution (from a realistic simulated cluster) over a wide range of scales. We comment on the residuals of the reconstruction and their implications, and discuss the extension of the method to include strong lensing information.

  7. Energy flux of Alfven waves in weakly ionized plasma

    E-Print Network [OSTI]

    J. Vranjes; S. Poedts; B. P. Pandey; B. De Pontieu

    2008-05-29T23:59:59.000Z

    The overshooting convective motions in the solar photosphere are frequently proposed as the source for the excitation of Alfv\\'en waves. However, the photosphere is a) very weakly ionized, and, b) the dynamics of the plasma particles in this region is heavily influenced by the plasma-neutral collisions. The purpose of this work is to check the consequences of these two facts on the above scenario and their effects on the electromagnetic waves. It is shown that the ions and electrons in the photosphere are both un-magnetized; their collision frequency with neutrals is much larger than the gyro-frequency. This implies that eventual Alfv\\'en-type electromagnetic perturbations must involve the neutrals as well. This has the following serious consequences: i) in the presence of perturbations, the whole fluid (plasma + neutrals) moves; ii) the Alfv\\'en velocity includes the total (plasma + neutrals) density and is thus considerably smaller compared to the collision-less case; iii) the perturbed velocity of a unit volume, which now includes both plasma and neutrals, becomes much smaller compared to the ideal (collision-less) case; and iv) the corresponding wave energy flux for the given parameters becomes much smaller compared to the ideal case.

  8. The effect of weak lensing on distance estimates from supernovae

    SciTech Connect (OSTI)

    Smith, Mathew; Maartens, Roy [Department of Physics, University of the Western Cape, Cape Town 7535 (South Africa); Bacon, David J.; Nichol, Robert C.; Campbell, Heather; D'Andrea, Chris B. [Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom); Clarkson, Chris [Astrophysics, Cosmology and Gravity Centre (ACGC), Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701 (South Africa); Bassett, Bruce A. [South African Astronomical Observatory, P.O. Box 9, Observatory 7935 (South Africa); Cinabro, David [Wayne State University, Department of Physics and Astronomy, Detroit, MI 48202 (United States); Finley, David A.; Frieman, Joshua A. [Center for Particle Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); Galbany, Lluis [CENTRA Centro Multidisciplinar de Astrofísica, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon (Portugal); Garnavich, Peter M. [Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States); Olmstead, Matthew D. [Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 (United States); Schneider, Donald P. [Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States); Shapiro, Charles [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, La Canada Flintridge, CA 91109 (United States); Sollerman, Jesper, E-mail: matsmith2@gmail.com [The Oskar Klein Centre, Department of Astronomy, AlbaNova, SE-106 91 Stockholm (Sweden)

    2014-01-01T23:59:59.000Z

    Using a sample of 608 Type Ia supernovae from the SDSS-II and BOSS surveys, combined with a sample of foreground galaxies from SDSS-II, we estimate the weak lensing convergence for each supernova line of sight. We find that the correlation between this measurement and the Hubble residuals is consistent with the prediction from lensing (at a significance of 1.7?). Strong correlations are also found between the residuals and supernova nuisance parameters after a linear correction is applied. When these other correlations are taken into account, the lensing signal is detected at 1.4?. We show, for the first time, that distance estimates from supernovae can be improved when lensing is incorporated, by including a new parameter in the SALT2 methodology for determining distance moduli. The recovered value of the new parameter is consistent with the lensing prediction. Using cosmic microwave background data from WMAP7, H {sub 0} data from Hubble Space Telescope and Sloan Digital Sky Survey (SDSS) Baryon acoustic oscillations measurements, we find the best-fit value of the new lensing parameter and show that the central values and uncertainties on ? {sub m} and w are unaffected. The lensing of supernovae, while only seen at marginal significance in this low-redshift sample, will be of vital importance for the next generation of surveys, such as DES and LSST, which will be systematics-dominated.

  9. A sample of weak blazars at milli-arcsecond resolution

    E-Print Network [OSTI]

    Mantovani, F; Mack, K -H; Alef, W; Ros, E; Zensus, J A

    2015-01-01T23:59:59.000Z

    We started a follow-up investigation of the Deep X-ray Radio Blazar Survey objects with declination >-10 deg. We undertook a survey with the EVN at 5GHz to make the first images of a complete sample of weak blazars, aiming at a comparison between high- and low-power samples of blazars. All of the 87 sources observed were detected. Point-like sources are found in 39 cases, and 48 show core-jet structure. According to the spectral indices previously obtained, 58 sources show a flat spectral index, and 29 sources show a steep spectrum or a spectrum peaking at a frequency around 1-2 GHz. Adding to the DXRBS objects we observed those already observed with ATCA in the southern sky, we found that 14 blazars and a SSRQ, are associated to gamma-ray emitters. We found that 56 sources can be considered blazars. We also detected 2 flat spectrum NLRGs. About 50% of the blazars associated to a gamma-ray object are BL Lacs, confirming that they are more likely detected among blazars gamma-emitters. We confirm the correlatio...

  10. Disentangling dark sector models using weak lensing statistics

    E-Print Network [OSTI]

    Giocoli, Carlo; Baldi, Marco; Meneghetti, Massimo; Moscardini, Lauro; Petkova, Margarita; -,; Astronomia, Dipartimento di Fisica e; di Bologna, Alma Mater Studiorum Università; di Bologna, INAF - Osservatorio Astronomico; di Bologna, INFN - Sezione; Université, Aix Marseille; CNRS,; LAM,; France,; Laboratory, Jet Propulsion; Physics, Department of; Ludwig-Maximilians-Universitaet),

    2015-01-01T23:59:59.000Z

    We perform multi-plane ray-tracing using the GLAMER gravitational lensing code within high-resolution light-cones extracted from the CoDECS simulations: a suite of cosmological runs featuring a coupling between Dark Energy and Cold Dark Matter. We show that the presence of the coupling is evident not only in the redshift evolution of the normalisation of the convergence power spectrum, but also in differences in non-linear structure formation with respect to {\\Lambda}CDM. Using a tomographic approach under the assumption of a {\\Lambda}CDM cosmology, we demonstrate that weak lensing measurements would result in a {\\sigma}8 value that changes with the source redshift if the true underlying cosmology is a coupled Dark Energy one. This provides a generic null test for these types of models. We also find that different models of coupled Dark Energy can show either an enhanced or a suppressed correlation between convergence maps with differing source redshifts as compared to {\\Lambda}CDM. This would provide a direc...

  11. Magnetic Catalysis and Quantum Hall Ferromagnetism in Weakly Coupled Graphene

    E-Print Network [OSTI]

    Gordon W. Semenoff; Fei Zhou

    2011-04-25T23:59:59.000Z

    We study the realization in a model of graphene of the phenomenon whereby the tendency of gauge-field mediated interactions to break chiral symmetry spontaneously is greatly enhanced in an external magnetic field. We prove that, in the weak coupling limit, and where the electron-electron interaction satisfies certain mild conditions, the ground state of charge neutral graphene in an external magnetic field is a quantum Hall ferromagnet which spontaneously breaks the emergent U(4) symmetry to U(2)XU(2). We argue that, due to a residual CP symmetry, the quantum Hall ferromagnet order parameter is given exactly by the leading order in perturbation theory. On the other hand, the chiral condensate which is the order parameter for chiral symmetry breaking generically obtains contributions at all orders. We compute the leading correction to the chiral condensate. We argue that the ensuing fermion spectrum resembles that of massive fermions with a vanishing U(4)-valued chemical potential. We discuss the realization of parity and charge conjugation symmetries and argue that, in the context of our model, the charge neutral quantum Hall state in graphene is a bulk insulator, with vanishing longitudinal conductivity due to a charge gap and Hall conductivity vanishing due to a residual discrete particle-hole symmetry.

  12. Solar weak currents, neutrino oscillations, and time variations

    SciTech Connect (OSTI)

    Haxton, W.C.; Zhang, W. (Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195 (USA) Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (USA))

    1991-04-15T23:59:59.000Z

    The effective neutrino mass in the presence of matter depends on both the charge and three-current weak densities. The effect of solar current loops on neutrino conversion need not be small if the scale of the eddies'' is comparable to the local oscillation length. This would seem to offer a mechanism for temporal variations in the neutrino flux that requires neither neutrino magnetic moments nor large solar density fluctuations. The effect of sinusoidally varying currents (or, alternatively, density fluctuations) is explored analytically and numerically. The analytic result we develop is based on the uniform approximation, and reduces to the adiabatic and Landau-Zener results in the appropriate limits. Despite the very interesting effects that may arise, we conclude that this mechanism for temporal variations in the solar-neutrino flux, like others suggested before, appears to require somewhat contrived solar conditions. However, it is quite likely that the influence of currents on neutrino effective masses is important and natural in other astrophysical settings, such as supernovas.

  13. Greenwood, Foster, and Romani: Archaeological Study of CA-VEN-110, California; and Roeder: Archaeological Study of CA-VEN-110, Ventura, California: Fish Remains

    E-Print Network [OSTI]

    Johnson, John R.

    1991-01-01T23:59:59.000Z

    procedures had been followed by Ventura County, the Corps ofStudy of CA-VEN-110, Ventura, California: Fish Remains. MarkLemos, and Jamie Karl V, Ventura County, et al,. Central

  14. Vertebrate remains from the Wilson-Leonard site (41WM235), Williamson County, Texas: Holocene animal exploitation in central Texas prehistory

    E-Print Network [OSTI]

    Baker, Barry Wayne

    1994-01-01T23:59:59.000Z

    VERTEBRATE REMAINS FROM THE WILSON-LEONARD SITE (41WM235L WILLIAMSON COUNTY, TEXAS: HOLOCENE ANIMAL EXPLOITATION IN CENTRAL TEXAS PREHISTORY A Thesis by BARRY WAYNE BAKER Submitted to the Office of Graduate Studies of Texas A&M University... in partial fulfillment of the requirements for the degree of MASTER OF ARTS May 1994 Major Subject: Anthropology VERTEBRATE REMAINS FROM THE WILSON-LEONARD SITE (41WM235), WILLIAMSON COUNTY, TEXAS: HOLOCENE ANIMAL EXPLOITATION IN CENTRAL TEXAS...

  15. A Hybrid Strong/Weak Coupling Approach to Jet Quenching

    E-Print Network [OSTI]

    Jorge Casalderrey-Solana; Doga Can Gulhan; José Guilherme Milhano; Daniel Pablos; Krishna Rajagopal

    2014-06-26T23:59:59.000Z

    We propose and explore a new hybrid approach to jet quenching in a strongly coupled medium. The basis of this phenomenological approach is to treat physics processes at different energy scales differently. The high-$Q^2$ processes associated with the QCD evolution of the jet from production as a single hard parton through its fragmentation, up to but not including hadronization, are treated perturbatively. The interactions between the partons in the shower and the deconfined matter within which they find themselves lead to energy loss. The momentum scales associated with the medium (of the order of the temperature) and with typical interactions between partons in the shower and the medium are sufficiently soft that strongly coupled physics plays an important role in energy loss. We model these interactions using qualitative insights from holographic calculations of the energy loss of energetic light quarks and gluons in a strongly coupled plasma, obtained via gauge/gravity duality. We embed this hybrid model into a hydrodynamic description of the spacetime evolution of the hot QCD matter produced in heavy ion collisions and confront its predictions with jet data from the LHC. The holographic expression for the energy loss of a light quark or gluon that we incorporate in our hybrid model is parametrized by a stopping distance. We find very good agreement with all the data as long as we choose a stopping distance that is comparable to but somewhat longer than that in ${\\cal N}=4$ supersymmetric Yang-Mills theory. For comparison, we also construct alternative models in which energy loss occurs as it would if the plasma were weakly coupled. We close with suggestions of observables that could provide more incisive evidence for, or against, the importance of strongly coupled physics in jet quenching.

  16. Surfactant-enhanced alkaline flooding with weak alkalis

    SciTech Connect (OSTI)

    French, T.R.; Josephson, C.B.

    1991-02-01T23:59:59.000Z

    The objective of Project BE4B in FY90 was to develop cost-effective and efficient chemical flooding formulations using surfactant-enhanced, lower pH (weak) alkaline chemical systems. Chemical systems were studied that mitigate the deleterious effects of divalent ions. The experiments were conducted with carbonate mixtures and carbonate/phosphate mixtures of pH 10.5, where most of the phosphate ions exist as the monohydrogen phosphate species. Orthophosphate did not further reduce the deleterious effect of divalent ions on interfacial tension behavior in carbonate solutions, where the deleterious effect of the divalent ions is already very low. When added to a carbonate mixture, orthophosphate did substantially reduce the adsorption of an atomic surfactant, which was an expected result; however, there was no correlation between the amount of reduction and the divalent ion levels. For acidic oils, a variety of surfactants are available commercially that have potential for use between pH 8.3 and pH 9.5. Several of these surfactants were tested with oil from Wilmington (CA) field and found to be suitable for use in that field. Two low-acid crude oils, with acid numbers of 0.01 and 0.27 mg KOH/g of oil, were studied. It was shown that surfactant-enhanced alkaline flooding does have merit for use with these low-acid crude oils. However, each low-acid oil tested was found to behave differently, and it was concluded that the applicability of the method must be experimentally determined for any given low-acid crude oil. 19 refs., 10 figs. 4 tabs.

  17. Mapping the 3-D Dark Matter potential with weak shear

    E-Print Network [OSTI]

    D. J. Bacon; A. N. Taylor

    2002-12-11T23:59:59.000Z

    We investigate the practical implementation of Taylor's (2002) 3-dimensional gravitational potential reconstruction method using weak gravitational lensing, together with the requisite reconstruction of the lensing potential. This methodology calculates the 3-D gravitational potential given a knowledge of shear estimates and redshifts for a set of galaxies. We analytically estimate the noise expected in the reconstructed gravitational field, taking into account the uncertainties associated with a finite survey, photometric redshift uncertainty, redshift-space distortions, and multiple scattering events. In order to implement this approach for future data analysis, we simulate the lensing distortion fields due to various mass distributions. We create catalogues of galaxies sampling this distortion in three dimensions, with realistic spatial distribution and intrinsic ellipticity for both ground-based and space-based surveys. Using the resulting catalogues of galaxy position and shear, we demonstrate that it is possible to reconstruct the lensing and gravitational potentials with our method. For example, we demonstrate that a typical ground-based shear survey with redshift limit z=1 and photometric redshifts with error Delta z=0.05 is directly able to measure the 3-D gravitational potential for mass concentrations >10^14 M_\\odot between 0.1

  18. Nonmesonic Weak Decay Dynamics from proton spectra of $?$-Hypernuclei

    E-Print Network [OSTI]

    Franjo Krmpotic; Cláudio De Conti

    2015-03-06T23:59:59.000Z

    A novel comparison between the data and the theory is proposed for the nonmesonic (NM) weak decay of hypernuclei. Instead of confronting the primary decay rates, as is usually done, we focus attention on the effective decay rates that are straightforwardly related with the number of emitted particles. Proton kinetic energy spectra of $^5_\\Lambda$He, $^7_\\Lambda$Li, $^9_\\Lambda$Be, $^{11}_\\Lambda$B, $^{12}_{\\Lambda}$C, $^{13}_\\Lambda$C, $^{15}_{\\Lambda}$N and $^{16}_{\\Lambda}$O, measured by FINUDA, are evaluated theoretically. The Independent Particle Shell Model (IPSM) is used as the nuclear structure framework, while the dynamics is described by the One-Meson-Exchange (OME) potential. Only for the $^{5}_{\\Lambda}$He, $^{7}_{\\Lambda}$Li, and $^{12}_{\\Lambda}$C hypernuclei is it possible to make a comparison with the data, since for the rest there is no published experimental information on number of produced hypernuclei. Considering solely the one-nucleon-induced ($1N$-NM) decay channel, the theory reproduces correctly the shapes of all three spectra at medium and high energies ($E_p \\geq 40 $ MeV). Yet, it greatly overestimates their magnitudes, as well as the corresponding transition rates when the full OME ($\\pi+K+ \\eta+\\rho+\\omega+K^*$) model is used. The agreement is much improved when only the $\\pi+K$ mesons with soft dipole cutoff parameters participate in the decay process. We find that the IPSM is a fair first order approximation to disentangle the dynamics of the $1N$-NM decay, the knowledge of which is indispensable to inquire about the baryon-baryon strangeness-flipping interaction. It is shown that the IPSM provides very useful insights regarding the determination the $2N$-NM decay rate. In a new analysis of the FINUDA data, we derive two results for this quantity with one of them close to that obtained previously.

  19. Blind source separation in the presence of weak sources J.-P. Nadala

    E-Print Network [OSTI]

    Aires, Filipe

    Blind source separation in the presence of weak sources J.-P. Nadala , E. Korutchevab,*, F. Airesa" as compared to the other ones, the "weak" sources. We find that it is preferable to perform blind source simulations. 2000 Elsevier Science Ltd. All rights reserved. Keywords: Independent component analysis; Blind

  20. Analysis of Biological Effects and Limits of Exposure to Weak Magnetic Fields

    E-Print Network [OSTI]

    Halgamuge, Malka N.

    to weak magnetic fields and geomagnetic field to elucidate the main points of contention. Most of the weak excitation and cardio stimulation can be caused due to the current induced in the body from high power fields [2]. The energy absorption rate of these high power magnetic fields is measured by the specific

  1. Equivalence Principle Violation in Weakly Vainshtein-Screened Systems Alexander V. Belikov1

    E-Print Network [OSTI]

    Hu, Wayne

    Equivalence Principle Violation in Weakly Vainshtein-Screened Systems Alexander V. Belikov1-dependent interactions cause apparent equivalence principle vi- olations. In the weakly-screened regime violations can [17­23]. In these models, all bodies accelerate equivalently in the total field of the fifth force

  2. Weak charge form factor and radius of 208Pb through parity violation in electron scattering

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Horowitz, C J; Jen, C -M; Rakhman, A; Souder, P A; Dalton, M M; Liyanage, N; Paschke, K D; Saenboonruang, K; Silwal, R; Franklin, G B; Friend, M; Quinn, B; Kumar, K S; McNulty, D; Mercado, L; Riordan, S; Wexler, J

    2012-03-26T23:59:59.000Z

    We use distorted wave electron scattering calculations to extract the weak charge form factor FW(q?), the weak charge radius RW, and the point neutron radius Rn, of 208Pb from the PREX parity violating asymmetry measurement. The form factor is the Fourier transform of the weak charge density at the average momentum transfer q? = 0.475 fm-1. We find FW(q?) = 0.204 ± 0.028(exp) ± 0.001(model). We use the Helm model to infer the weak radius from FW(q?). We find RW = 5.826 ± 0.181(exp) ± 0.027(model) fm. Here the exp error includes PREX statistical and systematic errors, while the model error describes the uncertainty in RW from uncertainties in the surface thickness ? of the weak charge density. The weak radius is larger than the charge radius, implying a 'weak charge skin' where the surface region is relatively enriched in weak charges compared to (electromagnetic) charges. We extract the point neutron radius Rn = 5.751 ± 0.175 (exp) ± 0.026(model) ± 0.005(strange) fm, from RW. Here there is only a very small error (strange) from possible strange quark contributions. We find Rn to be slightly smaller than RW because of the nucleon's size. Finally, we find a neutron skin thickness of Rn-Rp = 0.302 ± 0.175 (exp) ± 0.026 (model) ± 0.005 (strange) fm, where Rp is the point proton radius.

  3. Weak charge form factor and radius of 208Pb through parity violation in electron scattering

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Horowitz, C J; Jen, C -M; Rakhman, A; Souder, P A; Dalton, M M; Liyanage, N; Paschke, K D; Saenboonruang, K; Silwal, R; Franklin, G B; et al

    2012-03-01T23:59:59.000Z

    We use distorted wave electron scattering calculations to extract the weak charge form factor FW(q?), the weak charge radius RW, and the point neutron radius Rn, of 208Pb from the PREX parity violating asymmetry measurement. The form factor is the Fourier transform of the weak charge density at the average momentum transfer q? = 0.475 fm-1. We find FW(q?) = 0.204 ± 0.028(exp) ± 0.001(model). We use the Helm model to infer the weak radius from FW(q?). We find RW = 5.826 ± 0.181(exp) ± 0.027(model) fm. Here the exp error includes PREX statistical and systematic errors, while the modelmore »error describes the uncertainty in RW from uncertainties in the surface thickness ? of the weak charge density. The weak radius is larger than the charge radius, implying a 'weak charge skin' where the surface region is relatively enriched in weak charges compared to (electromagnetic) charges. We extract the point neutron radius Rn = 5.751 ± 0.175 (exp) ± 0.026(model) ± 0.005(strange) fm, from RW. Here there is only a very small error (strange) from possible strange quark contributions. We find Rn to be slightly smaller than RW because of the nucleon's size. Finally, we find a neutron skin thickness of Rn-Rp = 0.302 ± 0.175 (exp) ± 0.026 (model) ± 0.005 (strange) fm, where Rp is the point proton radius.« less

  4. A Dynamic Dendritic Refractory Period Regulates Burst Discharge in the Electrosensory Lobe of Weakly Electric Fish

    E-Print Network [OSTI]

    Turner, Ray

    of Weakly Electric Fish Liza Noonan,1* Brent Doiron,2* Carlo Laing,2* Andre Longtin,2 and Ray W. Turner1 1 other voltage-dependent currents (Yuste et al., 1994; Golding et al., 1999; Magee and Car- ruth, 1999 lateral line lobe (ELL) of weakly electr

  5. INTRODUCTION The electric sense of mormyrid weakly electric fish is generally

    E-Print Network [OSTI]

    Grant, Kirsty

    921 INTRODUCTION The electric sense of mormyrid weakly electric fish is generally regarded to be the dominant sense for orientation and communication in these animals. Weakly electric fish explore their environment by the aid of active electrolocation. They generate electric fields and analyze the distortions

  6. Weak-Axis Behavior of Wide Flange Columns Subjected to Blast

    E-Print Network [OSTI]

    Bruneau, Michel

    the effect of blast loading on wide flange columns loaded perpendicular to the weak axis of bending field detonations. Furthermore, past studies investigating the effect of blast load- ing on wide flangeWeak-Axis Behavior of Wide Flange Columns Subjected to Blast Nagarjun Krishnappa1 ; Michel Bruneau

  7. The Lyons Creek boat remains

    E-Print Network [OSTI]

    Neyland, Robert Stephen

    1990-01-01T23:59:59.000Z

    transportation. Only a few other American colonial-era small craft have as yet been studied, some of which are the Brown's P*y 1 'S*thC1', thEm'Lk Champlain, the Hart's Cove wzeck in New Hampshire, the J R' b t 1 V' g' ', d tl* ~Sk Massachusetts (Albright..., beginning at its mouth, is 9ust over a mile, while the drainage system extends for several miles east of Maryland Route 4. Near the mouth of Lyons Creek, the northern shore is a wetland that is reduced to a grassy mudflat at ebb tide. Only a slender...

  8. Diesel prices remain fairly stable

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContract Management FermiDavidDiesel prices continueU.S.DieselDiesel

  9. Method and apparatus for evaluating structural weakness in polymer matrix composites

    DOE Patents [OSTI]

    Wachter, E.A.; Fisher, W.G.

    1996-01-09T23:59:59.000Z

    A method and apparatus for evaluating structural weaknesses in polymer matrix composites is described. An object to be studied is illuminated with laser radiation and fluorescence emanating therefrom is collected and filtered. The fluorescence is then imaged and the image is studied to determine fluorescence intensity over the surface of the object being studied and the wavelength of maximum fluorescent intensity. Such images provide a map of the structural integrity of the part being studied and weaknesses, particularly weaknesses created by exposure of the object to heat, are readily visible in the image. 6 figs.

  10. DEWEK Wind Energy Conference 2012 Category: 4. Simulation models BACKWARD EXTRAPOLATION OF SHORT-TIME MEASUREMENT DATA FOR A REMAINING SERVICE LIFE ESTIMATION OF WIND

    E-Print Network [OSTI]

    Berlin,Technische Universität

    DEWEK Wind Energy Conference 2012 Category: 4. Simulation models 1 BACKWARD EXTRAPOLATION OF SHORT-TIME MEASUREMENT DATA FOR A REMAINING SERVICE LIFE ESTIMATION OF WIND TURBINES Dipl.-Ing. René Kamieth, Prof. Dr, Germany, Tel.: +49-(0)30-314-23603, Fax: +49-(0)30-314-26131 Summary Wind turbines built in the last

  11. Remaining FY13 Compensatory (COMP) Bank Balances in ITAMS This is to remind you that compensatory (COMP) hours may not be carried over from

    E-Print Network [OSTI]

    Almor, Amit

    Remaining FY13 Compensatory (COMP) Bank Balances in ITAMS This is to remind you that compensatory week that Fiscal Year 2013 COMP hours can be used via ITAMS. Approved timesheets for the June 9-15th University policy, hours may not be recorded in units of less than one-quarter hour. ITAMS only allows work

  12. Remaining FY14 Compensatory (COMP) Bank Balances in ITAMS This is to remind you that compensatory (COMP) hours may not be carried over from

    E-Print Network [OSTI]

    Almor, Amit

    Remaining FY14 Compensatory (COMP) Bank Balances in ITAMS This is to remind you that compensatory week that Fiscal Year 2014 COMP hours can be used via ITAMS. Approved timesheets for the June 8-14th that per University policy, hours may not be recorded in units of less than one-quarter hour. ITAMS only

  13. NATURE CLIMATE CHANGE | VOL 3 | FEBRUARY 2013 | www.nature.com/natureclimatechange 105 ossil fuels are expected to remain the dominant source of energy

    E-Print Network [OSTI]

    Haszeldine, Stuart

    fuels are expected to remain the dominant source of energy for decades to come1 (Fig. 1). Capturing, the International Energy Agency (IEA) Blue Map scenario2 envis- ages a 19% CO2 reductions contribution from CCS (ref. 4.) The IEA World Energy Outlook 20111 forecasts that existing energy facilities will account

  14. http://www.swissinfo.org/eng/search/detail/Bird_flu_ban_remains_despite_migration_shift.html?siteSect=881& sid=7420407&cKey=1168586962000

    E-Print Network [OSTI]

    Alvarez, Nadir

    , warmer than average temperatures in the Atlantic and Mediterranean ­ all pumping heat into the atmosphere_flu_ban_remains_despite_migration_shift.html?siteSect=881& sid=7420407&cKey=1168586962000 Monday 05.03.2007 Climate warning resonates in Switzerland weather heralded a bumper year for bugs and ticks. He said a cold snap in February or March would still

  15. BRST quantization of SU(2/1) electro-weak theory in the superconnection approach - and the Higgs meson mass

    E-Print Network [OSTI]

    Hwang, D S; Ne'eman, Yuval

    1994-01-01T23:59:59.000Z

    BRST quantization of SU(2/1) electro-weak theory in the superconnection approach - and the Higgs meson mass

  16. Determination of the semi-leptonic weak interaction pseudoscalar coupling constant , g$_{P}$, using the reaction $\\mu^{-}$p --> $\

    E-Print Network [OSTI]

    Hasinoff, M D; Azuelos, Georges; Bertl, W; Blecher, M; Chen, C Q; Depommier, P; Doyle, B; Von Egidy, T; Gorringe, T P; Gumplinger, P; Henderson, R; Jonkmans, G; Larabee, A J; MacDonald, J A; McDonald, S C; Munro, M H; Poutissou, J M; Poutissou, R; Robertson, B C; Sample, D G; Schott, W; Taylor, G N; Veillette, S; Wright, D H

    1992-01-01T23:59:59.000Z

    Determination of the semi-leptonic weak interaction pseudoscalar coupling constant , g$_{P}$, using the reaction $\\mu^{-}$p --> $\

  17. A weak-value interpretation of the Schwinger mechanism of massless/massive pair productions

    E-Print Network [OSTI]

    Kazuhiro Yokota; Nobuyuki Imoto

    2015-04-28T23:59:59.000Z

    According to the Schwinger mechanism, a uniform electric field brings about pair productions in vacuum; the relationship between the production rate and the electric field is different, depending on the dimension of the system. In this paper, we make an offer of another model for the pair productions, in which weak values are incorporated: energy fluctuations trigger the pair production, and a weak value appears as the velocity of a particle there. Although our model is only available for the approximation of the pair production rates, the weak value reveals a new aspect of the pair production. Especially, within the first order, our estimation approximately agrees with the exponential decreasing rate of the Landau-Zener tunneling through the mass energy gap. In other words, such tunneling can be associated with energy fluctuations via the weak value, when the tunneling gap can be regarded as so small due to the high electric field.

  18. On death ground : why weak states resist great powers explaining coercion failure in asymmetric interstate conflict

    E-Print Network [OSTI]

    Haun, Phil M

    2010-01-01T23:59:59.000Z

    Great Powers often adopt coercive strategies, threatening or using limited force to convince weak states to comply with their demands. While coercive strategies have succeeded in just over half of asymmetric crises since ...

  19. Weak formulations and solution multiplicity of equilibrium configurations with Coulomb friction

    E-Print Network [OSTI]

    Bostan, Mihai

    Weak formulations and solution multiplicity of equilibrium configurations with Coulomb friction configurations of elastic struc- tures in contact with Coulomb friction. We obtain a variational formulation configurations with arbitrary small friction coefficients. We illustrate the result in two space dimensions

  20. On the maintenance of weak meridional temperature gradients during warm climates

    E-Print Network [OSTI]

    Korty, Robert Lindsay

    2005-01-01T23:59:59.000Z

    This thesis examines the dynamics of equable climates. The underlying physics of two mechanisms by which weak meridional temperature gradients might be maintained are studied. First, I examine the evolution of stratospheric ...

  1. Exploring the Environmental Preference of Weak Interactions in ( / )8 Barrel Proteins

    E-Print Network [OSTI]

    Babu, M. Madan

    Exploring the Environmental Preference of Weak Interactions in ( / )8 Barrel Proteins S of Biotechnology and Chemical Engineering, Vellore Institute of Technology, Vellore, India 2 MRC Laboratory of Molecular Biology, Cambridge, United Kingdom 3 National Center for Biotechnology Information, National

  2. RECTANGULAR POLYOMINO SET WEAK (1,2)-ACHIEVEMENT GAMES EDGAR FISHER AND NNDOR SIEBEN

    E-Print Network [OSTI]

    Sieben, Nándor

    RECTANGULAR POLYOMINO SET WEAK (1,2)-ACHIEVEMENT GAMES EDGAR FISHER AND NÁNDOR SIEBEN Abstract Classi#28;cation. 05B50, 91A46. Key words and phrases. achievement games, polyomino. 1 #12; 2 EDGAR

  3. Observation of Weak C-H...O Hydrogen Bonding by Unactivated Alkanes...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    structures at low temperatures due to weak C-H…O hydrogen bonding between the terminal CH3 and CO2- groups for n?5. Temperature-dependent studies showed that the folding...

  4. Phase shift of a weak coherent beam induced by a single atom

    E-Print Network [OSTI]

    Syed Abdullah Aljunid; Meng Khoon Tey; Brenda Chng; Timothy Liew; Gleb Maslennikov; Valerio Scarani; Christian Kurtsiefer

    2009-05-22T23:59:59.000Z

    We report on a direct measurement of a phase shift on a weak coherent beam by a single Rb-87 atom in a Mach-Zehnder interferometer. A maximum phase shift of about 1 degree is observed experimentally.

  5. Efficient weakly-radiative wireless energy transfer: An EIT-like approach

    E-Print Network [OSTI]

    Hamam, Rafif E.

    Inspired by a quantum interference phenomenon known in the atomic physics community as electromagnetically induced transparency (EIT), we propose an efficient weakly radiative wireless energy transfer scheme between two ...

  6. On the construction and properties of weak solutions describing dynamic cavitation

    E-Print Network [OSTI]

    Miroshnikov, Alexey

    On the construction and properties of weak solutions describing dynamic cavitation (In: Journal associated with dynamically cavitating solutions coincides with the critical stretching in the bifurcation with contents. Keywords: Cavitation, Shock wave, Polyconvex elasticity Mathematics Subject Classification: 35L67

  7. Immersive audiomotor game play enhances neural and perceptual salience of weak signals in noise

    E-Print Network [OSTI]

    Hancock, Kenneth E.

    All sensory systems face the fundamental challenge of encoding weak signals in noisy backgrounds. Although discrimination abilities can improve with practice, these benefits rarely generalize to untrained stimulus dimensions. ...

  8. Weak and electromagnetic mechanisms of neutrino-pair photoproduction in a strongly magnetized electron gas

    SciTech Connect (OSTI)

    Borisov, A. V.; Kerimov, B. K.; Sizin, P. E., E-mail: borisov@phys.msu.ru [Moscow State University (Russian Federation)

    2012-11-15T23:59:59.000Z

    Expressions for the power of neutrino radiation from a degenerate electron gas in a strong magnetic field are derived for the case of neutrino-pair photoproduction via the weak and electromagnetic interaction mechanisms (it is assumed that the neutrino possesses electromagnetic form factors). It is shown that the neutrino luminosity of a medium in the electromagnetic reaction channel may exceed substantially the luminosity in the weak channel. Relative upper bounds on the effective neutrino magnetic moment are obtained.

  9. The Difficulty of the Heating of Cluster Cooling Flows by Sound Waves and Weak Shocks

    E-Print Network [OSTI]

    Yutaka Fujita; Takeru Ken Suzuki

    2006-10-23T23:59:59.000Z

    We investigate heating of the cool core of a galaxy cluster through the dissipation of sound waves and weak shocks excited by the activities of the central active galactic nucleus (AGN). Using a weak shock theory, we show that this heating mechanism alone cannot reproduce observed temperature and density profiles of a cluster, because the dissipation length of the waves is much smaller than the size of the core and thus the wave energy is not distributed to the whole core.

  10. Analytic Expression of the Genus in Weakly Non-Gaussian Field Induced by Gravity

    E-Print Network [OSTI]

    T. Matsubara

    1994-05-16T23:59:59.000Z

    The gravitational evolution of the genus of the density field in large-scale structure is analytically studied in a weakly nonlinear regime using second-order perturbation theory. Weakly nonlinear evolution produces asymmetry in the symmetric genus curve for Gaussian initial density field. The effect of smoothing the density field in perturbation theory on the genus curve is also evaluated and gives the dependence of the asymmetry of the genus curve on spectra of initial fluctuations.

  11. Nuclear magnetic absorption line widths in weak magnetic fields with a Robinson oscillator

    E-Print Network [OSTI]

    Flugum, Timothy Lee

    1987-01-01T23:59:59.000Z

    NUCLEAR MAGNETIC ABSORPTION LINE WIDTHS IN WEAK MAGNETIC FIELDS WITH A ROBINSON OSCILLATOR A Thesis by TIMOTHY LEE FLUGUM Subnntted to the Graduate College of Texas ARM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 19SI Major Subject: Physics NUCLEAR MAGNETIC ABSORPTION LINE WIDTHS IN WEAK MAGNETIC FIELDS WITH A ROBINSON OSCILLATOR A Thesis TIMOTHY LEE FLUGUM Approved as to style and content by: Nelson M. Duller (Chairman...

  12. Remaining Sites Verification Package for the 118-C-3:3, 105-C French Drains, Waste Site Reclassification Form 2006-016

    SciTech Connect (OSTI)

    R. A. Carlson

    2006-04-24T23:59:59.000Z

    The 118-C-3:3 french drains received condensate from the steam heating system in the 105-C Reactor Building. The 118-C-3:3 french drain meets the remedial action objectives specified in the Remaining Sites ROD. The results demonstrate that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  13. Phased Construction Completion Report for Bldg. K-1401 of the Remaining Facilities Demolition Project at the East Tennessee Technology Park, Oak Ridge, Tennessee

    SciTech Connect (OSTI)

    Bechtel Jacobs

    2008-10-01T23:59:59.000Z

    This Phased Construction Completion Report documents the demolition of Bldg. K-1401, Maintenance Building, addressed in the Action Memorandum for the Remaining Facilities Demolition Project at East Tennessee Technology Park, Oak Ridge, Tennessee (DOE 2003a) as a Comprehensive Environmental Response, Compensation, and Liability Act of 1980 non-time-critical removal action. The objectives of the removal action (DOE 2003a) - to eliminate the source of potential contamination, to eliminate the threat of potential future releases, and/or to eliminate the threats to the general public and the environment - were met. The end state of this action is for the slab to remain with all penetrations sealed and grouted or backfilled. The basement and pits remain open. There is residual radiological and polychlorinated biphenyl contamination on the slab and basement. A fixative was applied to the area on the pad contaminated with polychlorinated biphenyls. Interim land-use controls will be maintained until final remediation decisions are made under the Zone 2 Record of Decision (DOE 2005a).

  14. Phased Construction Completion Report for Building K-1401 of the Remaining Facilities Demolition Project at the East Tennessee Technology Park Oak Ridge, Tennessee

    SciTech Connect (OSTI)

    Garland S.

    2008-03-01T23:59:59.000Z

    This Phased Construction Completion Report documents the demolition of Bldg. K-1401, Maintenance Building, addressed in the Action Memorandum for the Remaining Facilities Demolition Project at East Tennessee Technology Park, Oak Ridge, Tennessee (DOE 2003a) as a Comprehensive Environmental Response, Compensation, and Liability Act of 1980 non-time-critical removal action. The objectives of the removal action (DOE 2003a) - to eliminate the source of potential contamination, to eliminate the threat of potential future releases, and/or to eliminate the threats to the general public and the environment - were met. The end state of this action is for the slab to remain with all penetrations sealed and grouted or backfilled. The basement and pits remain open. There is residual radiological and polychlorinated biphenyl contamination on the slab and basement. A fixative was applied to the area on the pad contaminated with polychlorinated biphenyls. Interim land-use controls will be maintained until final remediation decisions are made under the Zone 2 Record of Decision (DOE 2005a).

  15. Potential sources of contamination to weak lensing measurements: constraints from N-body simulations

    E-Print Network [OSTI]

    Catherine Heymans; Martin White; Alan Heavens; Chris Vale; Ludovic Van Waerbeke

    2006-06-16T23:59:59.000Z

    We investigate the expected correlation between the weak gravitational shear of distant galaxies and the orientation of foreground galaxies, through the use of numerical simulations. This shear-ellipticity correlation can mimic a cosmological weak lensing signal, and is potentially the limiting physical systematic effect for cosmology with future high-precision weak lensing surveys. We find that, if uncorrected, the shear-ellipticity correlation could contribute up to 10% of the weak lensing signal on scales up to 20 arcminutes, for lensing surveys with a median depth z=1. The most massive foreground galaxies are expected to cause the largest correlations, a result also seen in the Sloan Digital Sky Survey. We find that the redshift dependence of the effect is proportional to the lensing efficiency of the foreground, and this offers prospects for removal to high precision, although with some model dependence. The contamination is characterised by a weakly negative B-mode, which can be used as a diagnostic of systematic errors. We also provide more accurate predictions for a second potential source of error, the intrinsic alignment of nearby galaxies. This source of contamination is less important, however, as it can be easily removed with distance information.

  16. Stacked Weak Lensing Mass Calibration: Estimators, Systematics, and Impact on Cosmological Parameter Constraints

    SciTech Connect (OSTI)

    Rozo, Eduardo; /U. Chicago /Chicago U., KICP; Wu, Hao-Yi; /KIPAC, Menlo Park; Schmidt, Fabian; /Caltech

    2011-11-04T23:59:59.000Z

    When extracting the weak lensing shear signal, one may employ either locally normalized or globally normalized shear estimators. The former is the standard approach when estimating cluster masses, while the latter is the more common method among peak finding efforts. While both approaches have identical signal-to-noise in the weak lensing limit, it is possible that higher order corrections or systematic considerations make one estimator preferable over the other. In this paper, we consider the efficacy of both estimators within the context of stacked weak lensing mass estimation in the Dark Energy Survey (DES). We find that the two estimators have nearly identical statistical precision, even after including higher order corrections, but that these corrections must be incorporated into the analysis to avoid observationally relevant biases in the recovered masses. We also demonstrate that finite bin-width effects may be significant if not properly accounted for, and that the two estimators exhibit different systematics, particularly with respect to contamination of the source catalog by foreground galaxies. Thus, the two estimators may be employed as a systematic cross-check of each other. Stacked weak lensing in the DES should allow for the mean mass of galaxy clusters to be calibrated to {approx}2% precision (statistical only), which can improve the figure of merit of the DES cluster abundance experiment by a factor of {approx}3 relative to the self-calibration expectation. A companion paper investigates how the two types of estimators considered here impact weak lensing peak finding efforts.

  17. Q{sub weak} experiment update and applications/opportunities at lower energies

    SciTech Connect (OSTI)

    Pitt, Mark L. [Center for Neutrino Physics and Department of Physics, Virginia Tech, Blacksburg, VA 24061 (United States); Collaboration: Qweak Collaboration

    2013-11-07T23:59:59.000Z

    The Q{sub weak} experiment has recently completed data-taking at Jefferson Lab. The primary focus of the experiment is to perform a precision measurement of the proton's neutral weak charge. The Standard Model gives a definite prediction for the weak charge. Any deviation from that can be interpreted as evidence for new physics beyond the Standard Model. This precision, low energy measurement is sensitive to new physics signatures at energy scales up to 2 TeV. The experiment measures the parity-violating asymmetry in the scattering of 1.165 GeV longitudinally polarized electrons on the proton at low momentum transfer (Q{sup 2} ? 0.025 (GeV/c){sup 2}). This paper provides a brief status report on the experiment with a focus on instrumentation and techniques that are applicable to lower beam energy realizations of parity-violating electron scattering measurements. Estimates of anticipated errors on the proton's weak charge expected if the Q{sub weak} apparatus were used at a lower beam energy are also discussed.

  18. Remaining Sites Verification Package for the 600-233 Waste Site, Vertical Pipe Near 100-B Electrical Laydown Area, Waste Site Reclassification Form 2005-041

    SciTech Connect (OSTI)

    R. A. Carlson

    2005-12-08T23:59:59.000Z

    The 600-233 waste site consisted of three small-diameter pipelines within the 600-232 waste site, including previously unknown diesel fuel supply lines discovered during site remediation. The 600-233 waste site has been remediated to achieve the remedial action objectives specified in the Remaining Sites ROD. The results of verification sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  19. Remaining Sites Verification Package for the 100-F-33, 146-F Aquatic Biology Fish Ponds, Waste Site Reclassification Form 2006-021

    SciTech Connect (OSTI)

    L. M. Dittmer

    2006-08-25T23:59:59.000Z

    The 100-F-33, 146-F Aquatice Biology Fish Ponds waste site was an area with six small rectangular ponds and one large circular pond used to conduct tests on fish using various mixtures of river and reactor effluent water. The current site conditions achieve the remedial action objectives specified in the Remaining Sites ROD. The results of verification and applicable confirmatory sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  20. Remaining Sites Verification Package for the 1607-F7, 141-M Building Septic Tank, Waste Site Reclassification Form 2006-040

    SciTech Connect (OSTI)

    L. M. Dittmer

    2006-10-19T23:59:59.000Z

    The 1607-F7, 141-M Building Septic Tank waste site was a septic tank and drain field that received sanitary sewage from the former 141-M Building. Remedial action was performed in August and November 2005. The results of verification sampling demonstrate that residual contaminant concentrations support future unrestricted land uses that can be represented by a rural-residential scenario. These results also show that residual concentrations support unrestricted future use of shallow zone soil and that contaminant levels remaining in the soil are protective of groundwater and the Columbia River.

  1. Anomalous skin effects in relativistic parallel propagating weakly magnetized electron plasma waves

    SciTech Connect (OSTI)

    Abbas, Gohar; Bashir, M. F. [Salam Chair in Physics, G. C. University, Lahore 54000 (Pakistan); Department of Physics, G. C. University, Lahore 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G. C. University, Lahore 54000 (Pakistan)

    2011-10-15T23:59:59.000Z

    Fully relativistic analysis of anomalous skin effects for parallel propagating waves in a weakly magnetized electron plasma is presented and general expressions for longitudinal and transverse permittivites are derived. It is found that the penetration depth for R- and L-waves increases as we move from non-relativistic to highly relativistic regime. The ambient magnetic field reduces/enhances the skin effects for R-wave/L-wave as the strength of the field is increased. In general, the weak magnetic field effects are pronounced for the weakly relativistic regime as compared with other relativistic cases. The results are also graphically illustrated. On switching off the magnetic field, previous results for field free case are retrieved [A. F. Alexandrov, A. S. Bogdankevich, and A. A. Rukhadze, Priniples of Plasma Electrodynamics (Springer-Verlag, Berlin, Heidelberg, 1984), Vol. 9, p. 106].

  2. Review Article: The weak interactive characteristic of resonance cells and broadband effect of metamaterials

    SciTech Connect (OSTI)

    Zhao, Xiaopeng, E-mail: xpzhao@nwpu.edu.cn; Song, Kun [Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710129 (China)

    2014-10-15T23:59:59.000Z

    Metamaterials are artificial media designed to control electromagnetic wave propagation. Due to resonance, most present-day metamaterials inevitably suffer from narrow bandwidth, extremely limiting their practical applications. On the basis of tailored properties, a metamaterial within which each distinct unit cell resonates at its inherent frequency and has almost no coupling effect with the other ones, termed as weak interaction system, can be formulated. The total response of a weak interaction system can be treated as an overlap of the single resonance spectrum of each type of different unit cells. This intriguing feature therefore makes it possible to accomplish multiband or broadband metamaterials in a simple way. By introducing defects into metamaterials to form a weak interaction system, multiband and broadband electromagnetic metamaterials have first been experimentally demonstrated by our group. The similar concept can also be readily extended to acoustic and seismic metamaterials.

  3. ATMOSPHERIC COMPOSITION OF WEAK G BAND STARS: CNO AND Li ABUNDANCES

    SciTech Connect (OSTI)

    Adamczak, Jens; Lambert, David L., E-mail: adamczak@astro.as.utexas.edu [McDonald Observatory, University of Texas, Austin, TX 78712 (United States)

    2013-03-10T23:59:59.000Z

    We determined the chemical composition of a large sample of weak G band stars-a rare class of G and K giants of intermediate mass with unusual abundances of C, N, and Li. We have observed 24 weak G band stars with the 2.7 m Harlan J. Smith Telescope at the McDonald Observatory and derived spectroscopic abundances for C, N, O, and Li, as well as for selected elements from Na-Eu. The results show that the atmospheres of weak G band stars are highly contaminated with CN-cycle products. The C underabundance is about a factor of 20 larger than for normal giants and the {sup 12}C/{sup 13}C ratio approaches the CN-cycle equilibrium value. In addition to the striking CN-cycle signature the strong N overabundance may indicate the presence of partially ON-cycled material in the atmospheres of the weak G band stars. The exact mechanism responsible for the transport of the elements to the surface has yet to be identified but could be induced by rapid rotation of the main sequence progenitors of the stars. The unusually high Li abundances in some of the stars are an indicator for Li production by the Cameron-Fowler mechanism. A quantitative prediction of a weak G band star's Li abundance is complicated by the strong temperature sensitivity of the mechanism and its participants. In addition to the unusual abundances of CN-cycle elements and Li, we find an overabundance of Na that is in accordance with the NeNa chain running in parallel with the CN cycle. Apart from these peculiarities, the element abundances in a weak G band star's atmosphere are consistent with those of normal giants.

  4. Weak interaction rates for Kr and Sr waiting-point nuclei under rp-process conditions

    E-Print Network [OSTI]

    P. Sarriguren

    2009-10-06T23:59:59.000Z

    Weak interaction rates are studied in neutron deficient Kr and Sr waiting-point isotopes in ranges of densities and temperatures relevant for the rp-process. The nuclear structure is described within a microscopic model (deformed QRPA) that reproduces not only the half-lives but also the Gamow-Teller strength distributions recently measured. The various sensitivities of the decay rates to both density and temperature are discussed. Continuum electron capture is shown to contribute significantly to the weak rates at rp-process conditions.

  5. Weak Gravitational Field in Finsler-Randers Space and Raychaudhuri Equation

    E-Print Network [OSTI]

    P. Stavrinos

    2012-09-13T23:59:59.000Z

    The linearized form of the metric of a Finsler - Randers space is studied in relation to the equations of motion, the deviation of geodesics and the generalized Raychaudhuri equation are given for a weak gravitational field. This equation is also derived in the framework of a tangent bundle. By using Cartan or Berwald-like connections we get some types "gravito - electromagnetic" curvature. In addition we investigate the conditions under which a definite Lagrangian in a Randers space leads to Einstein field equations under the presence of electromagnetic field. Finally, some applications of the weak field in a generalized Finsler spacetime for gravitational waves are given.

  6. Reversing the weak measurement of an arbitrary field with finite photon number

    E-Print Network [OSTI]

    Sun, Qingqing; Al-Amri, M.; Zubairy, M. Suhail.

    2009-01-01T23:59:59.000Z

    this weak measurement does not totally collapse the system, the infor- mation of the initial state is passed over to the final state. If such retained information is complete, it would be possible to recover the initial state with some operations... between the unsharpness of the measurement and the best efficiency of the reversing operation #3;10#4;. In a recent experiment #3;11#4;, based on a proposal by Korotkov and Jordan #3;12#4;, the rever- sal of a weak measurement on a superconducting...

  7. Light Water Reactor Sustainability (LWRS) Program – Non-Destructive Evaluation (NDE) R&D Roadmap for Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants

    SciTech Connect (OSTI)

    Simmons, Kevin L.; Ramuhalli, Pradeep; Brenchley, David L.; Coble, Jamie B.; Hashemian, Hash; Konnik, Robert; Ray, Sheila

    2012-09-14T23:59:59.000Z

    The purpose of the non-destructive evaluation (NDE) R&D Roadmap for Cables is to support the Materials Aging and Degradation (MAaD) R&D pathway. The focus of the workshop was to identify the technical gaps in detecting aging cables and predicting their remaining life expectancy. The workshop was held in Knoxville, Tennessee, on July 30, 2012, at Analysis and Measurement Services Corporation (AMS) headquarters. The workshop was attended by 30 experts in materials, electrical engineering, U.S. Nuclear Regulatory Commission (NRC), U.S. Department of Energy (DOE) National Laboratories (Oak Ridge National Laboratory, Pacific Northwest National Laboratory, Argonne National Laboratory, and Idaho National Engineering Laboratory), NDE instrumentation development, universities, commercial NDE services and cable manufacturers, and Electric Power Research Institute (EPRI). The motivation for the R&D roadmap comes from the need to address the aging management of in-containment cables at nuclear power plants (NPPs).

  8. Light Water Reactor Sustainability (LWRS) Program – Non-Destructive Evaluation (NDE) R&D Roadmap for Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants

    SciTech Connect (OSTI)

    Simmons, K.L.; Ramuhali, P.; Brenchley, D.L.; Coble, J.B.; Hashemian, H.M.; Konnick, R.; Ray, S.

    2012-09-01T23:59:59.000Z

    Executive Summary [partial] The purpose of the non-destructive evaluation (NDE) R&D Roadmap for Cables is to support the Materials Aging and Degradation (MAaD) R&D pathway. A workshop was held to gather subject matter experts to develop the NDE R&D Roadmap for Cables. The focus of the workshop was to identify the technical gaps in detecting aging cables and predicting their remaining life expectancy. The workshop was held in Knoxville, Tennessee, on July 30, 2012, at Analysis and Measurement Services Corporation (AMS) headquarters. The workshop was attended by 30 experts in materials, electrical engineering, and NDE instrumentation development from the U.S. Nuclear Regulatory Commission (NRC), U.S. Department of Energy (DOE) National Laboratories (Oak Ridge National Laboratory, Pacific Northwest National Laboratory, Argonne National Laboratory, and Idaho National Engineering Laboratory), universities, commercial NDE service vendors and cable manufacturers, and the Electric Power Research Institute (EPRI).

  9. Remaining Sites Verification Package for the 100-C-9:1 Main Process Sewer Collection Line, Waste Site Reclassification Form 2004-012

    SciTech Connect (OSTI)

    L. M. Dittmer

    2007-06-11T23:59:59.000Z

    The 100-C-9:1 main process sewer pipeline, also known as the twin box culvert, was a dual reinforced process sewer that collected process effluent from the 183-C and 190-C water treatment facilities, discharging at the 132-C-2 Outfall. For remedial action purposes, the 100-C-9:1 waste site was subdivided into northern and southern sections. The 100-C-9:1 subsite has been remediated to achieve the remedial action objectives specified in the Remaining Sites ROD. The results of verification sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  10. Remaining Sites Verification Package for the 100-F-44:2, Discovery Pipeline Near 108-F Building, Waste Site Reclassification Form 2007-006

    SciTech Connect (OSTI)

    J. M. Capron

    2008-05-30T23:59:59.000Z

    The 100-F-44:2 waste site is a steel pipeline that was discovered in a junction box during confirmatory sampling of the 100-F-26:4 pipeline from December 2004 through January 2005. The 100-F-44:2 pipeline feeds into the 100-F-26:4 subsite vitrified clay pipe (VCP) process sewer pipeline from the 108-F Biology Laboratory at the junction box. In accordance with this evaluation, the confirmatory sampling results support a reclassification of this site to No Action. The current site conditions achieve the remedial action objectives and the corresponding remedial action goals established in the Remaining Sites ROD. The results of confirmatory sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  11. Remaining Sites Verification Package for the 100-D-9 Boiler Fuel Oil Tank Site, Waste Site Reclassification Form 2006-030

    SciTech Connect (OSTI)

    L. M. Dittmer

    2006-08-10T23:59:59.000Z

    The 100-D-9 site is the former location of an underground storage tank used for holding fuel for the 184-DA Boiler House. Results of soil-gas samples taken from six soil-gas probes in a rectangle around the site the tank had been removed from concluded that there were no volatile organic compounds at detectable levels in the area. The 100-D-9 Boiler Fuel Oil Tank Site meets the remedial action objectives specified in the Remaining Sites ROD. The results demonstrated that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  12. Remaining Sites Verification Package for the 1607-B2 Septic System and 100-B-14:2 Sanitary Sewer System, Waste Site Reclassification Form 2006-055

    SciTech Connect (OSTI)

    L. M. Dittmer

    2007-03-21T23:59:59.000Z

    The 1607-B2 waste site is a former septic system associated with various 100-B facilities, including the 105-B, 108-B, 115-B/C, and 185/190-B buildings. The site was evaluated based on confirmatory results for feeder lines within the 100-B-14:2 subsite and determined to require remediation. The 1607-B2 waste site has been remediated to achieve the remedial action objectives specified in the Remaining Sites ROD. The results of verification sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.

  13. An evaluation of known remaining oil resources in the state of Kansas: Project on advanced oil recovery and the states. Volume 4

    SciTech Connect (OSTI)

    NONE

    1993-11-01T23:59:59.000Z

    The Interstate Oil and Gas Compact Commission (IOGCC) has conducted a series of studies to evaluate the known, remaining oil resource in twenty-three (23) states. The primary objective of die IOGCC`s effort is to examine the potential impact of an aggressive and focused program of research, development, and demonstration (RD&D) and technology transfer on future oil recovery in the United States. As part of a larger effort by the IOGCC, this report focuses on the potential economic benefits of improved oil recovery in the state of Kansas. Individual reports for seven other oil producing states and a national report have been separately published by the IOGCC. Several major technical insights for state and Federal policymakers and regulators can be reached from this analysis. Overall, well abandonments and more stringent environmental regulations could limit economic access to the nation`s known, remaining oil resource. The high risk of near-term abandonment and the significant benefits of future application of improved oil recovery technoloy, clearly point to a need for more aggressive transfer of currently available technologies to domestic oil producers. Development and application of advanced oil recovery technologies could leave even greater benefits to the nation. A collaborative, focused RD&D effort, integrating the resources and expertise of industry, state and local governments, and the Federal government, is clearly warranted. With effective RD&D and a program of aggressive technology transfer to widely disseminate its results, Kansas oil production could be maximized. The resulting increase in production rates, employment, operator profits, state and Federal tax revenues, energy security will benefit the state of Kansas and the nation as a whole.

  14. An evaluation of known remaining oil resources in the state of Kansas and Oklahoma. Volume 5, Project on Advanced Oil Recovery and the States

    SciTech Connect (OSTI)

    Not Available

    1994-11-01T23:59:59.000Z

    The Interstate Oil and Gas Compact Commission (IOGCC) has conducted a series of studies to evaluate the known, remaining oil resource in twenty-three (23) states. The primary objective of the IOGCC`s effort is to examine the potential impact of an aggressive and focused program of research, development, and demonstration (RD&D) and technology transfer on future oil recovery in the United States. As part of a larger effort by the IOGCC, this report focuses on the potential economic benefits of improved oil recovery in the states of Kansas, Illinois and Oklahoma for five other oil producing states and a national report have been separately published by the IOGCC. The analysis presented in this report is based on the databases and models available in the Tertiary Oil Recovery Information System (TORIS). Overall, well abandonments and more stringent environmental regulations could limit economic access to Kansas` known, remaining oil resource. The high risk of near-term abandonment and the significant benefits of future application of improved oil recovery technology, clearly point to a need for more aggressive transfer of currently available technologies to domestic oil producers. Development and application of advanced oil recovery technologies could have even greater benefits to the state and the nation. A collaborative, focused RD&D effort, integrating the resources and expertise of industry, state and local governments, and the Federal government, is clearly warranted. With effective RD&D and a program of aggressive technology transfer to widely disseminate its results, oil production could be maximized. The resulting increase in production rates, employment, operator profits, state and Federal tax revenues, and energy security will benefit both the state of Kansas, Illinois and Oklahoma and the nation as a whole.

  15. An evaluation of known remaining oil resources in the state of Oklahoma: Project on advanced oil recovery and the states. Volume 7

    SciTech Connect (OSTI)

    NONE

    1993-11-01T23:59:59.000Z

    The Interstate Oil and Gas Compact Commission (IOGCC) has conducted a series of studies to evaluate the known, remaining oil resource in twenty-three (23) states. The primary objective of die IOGCC`s effort is to examine the potential impact of an aggressive and focused program of research, development, and demonstration (RD&D) and technology transfer on future oil recovery in the United States. As part of a larger effort by the IOGCC, this report focuses on the potential economic benefits of improved oil recovery in the state of Oklahoma. Individual reports for seven other oil producing states and a national report have been separately published by the IOGCC. Several major technical insights for state and Federal policymakers and regulators can be reached from this analysis. Overall, well abandonments and more stringent environmental regulations could limit economic access to Oklahoma`s known, remaining oil resource. The high risk of near-term abandonment and the significant benefits of future application of improved oil recovery technoloy, clearly point to a need for more aggressive transfer of currently available technologies to domestic oil producers. Development and application of advanced oil recovery technologies could leave even greater benefits to the nation. A collaborative, focused RD&D effort, integrating the resources and expertise of industry, state and local governments, and the Federal government, is clearly warranted. With effective RD&D and a program of aggressive technology transfer to widely disseminate its results, Oklahoma oil production could be maximized. The resulting increase and improvement in production rates, employment, operator profits, state and Federal tax revenues, energy security will benefit both the state of Oklahoma and the nation as a whole.

  16. An evaluation of known remaining oil resources in the United States: Project on advanced oil recovery and the states. Volume 1

    SciTech Connect (OSTI)

    NONE

    1993-11-01T23:59:59.000Z

    The Interstate Oil and Gas Compact Commission (IOGCC) has conducted a series of studies to evaluate the known, remaining oil resource in twenty-three (23) states. The primary objective of die IOGCC`s effort is to examine the potential impact of an aggressive and focused program of research, development, and demonstration (RD&D) and technology transfer on future oil recovery in the United States. As part of a larger effort by the IOGCC, this report focuses on the potential economic, social, and political benefits of improved oil recovery to the nation as a whole. Individual reports for major oil producing states have been separately published. The individual state reports include California, Illinois, Kansas, Louisiana, New Mexico, Oklahoma, Texas, and Wyoming. Overall, well abandonments and more stringent environmental regulations could limit economic access to the nation`s known, remaining oil resource. The high risk of near-term abandonment and the significant benefits of future application of improved oil recovery technoloy, clearly point to a need for more aggressive transfer of currently available technologies to domestic oil producers. Development and application of advanced oil recovery technologies could leave even greater benefits to the nation. A collaborative, focused RD&D effort, integrating the resources and expertise of industry, state and local governments, and the Federal government, is clearly warranted. With effective RD&D and a program of aggressive technology transfer to widely disseminate its results, domestic oil production could be maximized. The resulting increase and improvement in production rates, employment, operator profits, state and Federal tax revenues, energy security will benefit the nation as a whole.

  17. Weak turbulence and collapses in the Majda-Mc-Laughlin-Tabak equation: Fluxes in wavenumber and in amplitude space

    E-Print Network [OSTI]

    Benno Rumpf Laura Biven

    2005-03-04T23:59:59.000Z

    The turbulent energy flow of the onedimensional Majda-McLaughlin-Tabak equation is studied numerically. The system exhibits weak turbulence for weak driving forces, while weak turbulence coexists with strongly nonlinear intermittent collapses when the system is strongly driven. These two types of dynamics can be distinguished by their energy and particle fluxes. The weakly turbulent process can be characterized by fluxes in wavenumber space, while additional fluxes in amplitude space emerge in the intermittent process. The particle flux is directed from low amplitudes towards high amplitudes, and the energy flows in the opposite direction.

  18. Cloud-integrated Storage What & Why 2StoreSimple White Pages: Shoring Up Infrastructure Weaknesses with Cloud Storage

    E-Print Network [OSTI]

    Chaudhuri, Surajit

    Cloud-integrated Storage ­ What & Why #12;2StoreSimple White Pages: Shoring Up Infrastructure Weaknesses with Cloud Storage Overview..........................................................................................................3 Enterprise-class storage platform

  19. Volume 50, Number 4 2009 361 Weakly electric fishes have been an important model system

    E-Print Network [OSTI]

    Chacron, Maurice

    Volume 50, Number 4 2009 361 Abstract Weakly electric fishes have been an important model system in behavioral neuroscience for more than 40 years. These fishes use a specialized electric organ to produce an electric field that is typically below 1 volt/cm and serves in many be- haviors including social

  20. Numerical Modeling of Hydro-acoustic Waves In Weakly Compressible Fluid Ali Abdolali1,2

    E-Print Network [OSTI]

    Kirby, James T.

    Numerical Modeling of Hydro-acoustic Waves In Weakly Compressible Fluid Ali Abdolali1,2 , James T of Civil Engineering, University of Roma Tre Low-frequency hydro-acoustic waves are precursors of tsunamis. Detection of hydro-acoustic waves generated due to the water column compression triggered by sudden seabed

  1. Energetic, 590 keV neutral atom imaging of a weak substorm with STEREO/STE

    E-Print Network [OSTI]

    California at Berkeley, University of

    then, ENAs have been used to remotely image the ring current during geomagnetic storms and substorms [eV neutral atoms (ENA) of a weak geomagnetic substorm (Dst > -8 nT and AE ] 200 nT), made by the Suprathermal spectrum consistent with in situ proton measurements at geosynchronous orbit, and a spatial asymmetry

  2. On Facebook, Most Ties are Weak The emergence of pervasive socio-technical networks brings new

    E-Print Network [OSTI]

    Ferrara, Emilio

    On Facebook, Most Ties are Weak Abstract The emergence of pervasive socio-technical networks brings's theory can be extended to online social networks like Facebook, suggesting to use interaction data requires knowledge of the topology of the social network, e.g., who is friend with whom on Facebook. Our

  3. The role of strong and weak ties in Facebook: a community structure perspective

    E-Print Network [OSTI]

    Ferrara, Emilio

    The role of strong and weak ties in Facebook: a community structure perspective Emilio Ferrara of the well-known Facebook network. In particular, we discuss the quantitative assessment of the strength-scale online social network such as Facebook. Complex networks, Social network analysis, Community structure

  4. Emergence of temporal-pattern sensitive neurons in the midbrain of weakly electric fish Gymnarchus niloticus

    E-Print Network [OSTI]

    Kawasaki, Masashi

    Emergence of temporal-pattern sensitive neurons in the midbrain of weakly electric fish Gymnarchus fish, Gymnarchus niloticus, to two stimulus parameters that are critical for its behavior the jamming frequencies of fish's own electric organ and that of a neighbor's. The second parameter is the spatial

  5. On the Storage Capacity of Hopfield Models with Weakly Correlated Patterns

    E-Print Network [OSTI]

    Bielefeld, University of

    On the Storage Capacity of Hopfield Models with Weakly Correlated Patterns Matthias L¨owe Universit@mathematik.uni­bielefeld.de Keywords: Hopfield model, neural networks, storage capacity, Markov chains, large deviations AMS Subject Classification: 82C32, 82B44, 60K35 Abstract We analyze the storage capacity of different forms of the Hopfield

  6. Computation of Weakly-Compressible Highly-Viscous Polymeric Liquid Flows

    E-Print Network [OSTI]

    Grant, P. W.

    such circumstances, the speed of sound is much larger than the velocity of the liquid, resulting in fast pressure, the ratio of fluid velocity to the speed of sound ( cuMa /= ), characterises the influence1 Computation of Weakly-Compressible Highly-Viscous Polymeric Liquid Flows M. F. Webster 1*, I. J

  7. Weak Data Secrecy via Obfuscation in Network Coding Based Content Distribution

    E-Print Network [OSTI]

    Battiti, Roberto

    Weak Data Secrecy via Obfuscation in Network Coding Based Content Distribution Roberto G. Cascella of California Los Angeles, 3732F Boelter Hall, CA 90095 Los Angeles Email: {cascella, crispo, battiti in terms of error/loss protection and faster dissemination at the cost of exposing the data to intermediate

  8. Analytical study of the propagation of acoustic waves in a 1D weakly disordered lattice

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Analytical study of the propagation of acoustic waves in a 1D weakly disordered lattice O. Richoux of the propagation of an acoustic wave through a normally distributed disordered lattice made up of Helmholtz propagation in random media, waveguide, scattering of acoustic waves. PACS 11.80.La ; 42.25.Dd ; 43.20.Mv ; 43

  9. Hamming embedding and weak geometric consistency for large scale image search

    E-Print Network [OSTI]

    Verbeek, Jakob

    Hamming embedding and weak geometric consistency for large scale image search Herve Jegou, Matthijs improves recent methods for large scale image search. State-of-the-art methods build on the bag large datasets. Exper- iments performed on a dataset of one million of images show a signifi- cant

  10. Voltage and Frequency Stability of Weak Power Distribution Networks with Droop-Controlled

    E-Print Network [OSTI]

    Lemmon, Michael

    Voltage and Frequency Stability of Weak Power Distribution Networks with Droop analysis, because of coupled network dynamics. Additionally, droop controlled rotational and electronic DG distribution network coupled with droop-controlled DG's, which are based on both fast inverters and SG

  11. Local deformations and incommensurability of high quality epitaxial graphene on a weakly interacting transition metal

    E-Print Network [OSTI]

    parameter mismatch when cooling down the sample from the graphene preparation temperature to the measurement to the preparation conditions. All these effects are consistent with initial growth and subsequent pining of grapheneLocal deformations and incommensurability of high quality epitaxial graphene on a weakly

  12. Adsorption of comb copolymers on weakly attractive solid surfaces A. Strioloa

    E-Print Network [OSTI]

    Jayaraman, Arthi

    Adsorption of comb copolymers on weakly attractive solid surfaces A. Strioloa Department In this work continuum and lattice Monte Carlo simulation methods are used to study the adsorption of linear. At infinite dilution the presence of short side chains promotes the adsorption of polymers favoring both

  13. Physica D 159 (2001) 3557 Wave group dynamics in weakly nonlinear long-wave models

    E-Print Network [OSTI]

    Pelinovsky, Dmitry

    Physica D 159 (2001) 35­57 Wave group dynamics in weakly nonlinear long-wave models Roger Grimshawa Communicated by A.C. Newell Abstract The dynamics of wave groups is studied for long waves, using the framework reserved. Keywords: Wave group dynamics; Korteweg­de Vries equation; Nonlinear Schr¨odinger equation 1

  14. INTRODUCTION Weakly electric knifefish have been studied for several decades to

    E-Print Network [OSTI]

    Curet, Oscar M.

    of South American electric fish (family Gymnotidae) swim by using a ribbon fin positioned along the ventral the mechanical principles of force generation by the ribbon fin in the context of the South American weakly direction rapidly (in 100ms) (MacIver et al., 2001) is integral to several behaviors. Previous work by Mac

  15. Weakly Turbulent Magnetohydrodynamic Waves in Compressible Low-Plasmas Benjamin D. G. Chandran

    E-Print Network [OSTI]

    Chandran, Ben

    evolve due to nonlinearities. If j!kjk ) 1, then the turbulence is weak, the fluctuations can perturbation theory [3,4]. On the other hand, if j!kjk & 1, then the fluctuations are not wavelike of the velocity fluctuation at scale kÃ?1 . Thus, the condition j!kjk ) 1 is satisfied provided j!kj ) kvk

  16. Combining the Ultra-Weak Variational Formulation and the Multilevel Fast Multipole Method

    E-Print Network [OSTI]

    Boyer, Edmond

    Combining the Ultra-Weak Variational Formulation and the Multilevel Fast Multipole Method Eric fast multipole method we obtain an efficient volume based solver with an exact auxiliary boundary ­ Integral Representation ­ Multilevel Fast Multipole Method 1 Introduction At progressively higher

  17. Plasma-wall transition in weakly coUisional G. Manfredi* and S. Devaux^

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Plasma-wall transition in weakly coUisional plasmas G. Manfredi* and S. Devaux^ *Institut de Abstract. This paper reviews some theoretical and computational aspects of plasma-wall interac- tions model, and are subsequently tested with kinetic simulations. The various regions com- posing the plasma

  18. Weakly-coupled systems in quantum control Nabile Boussaid, Marco Caponigro, and Thomas Chambrion

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , is a real function modeling a laser l, and ul,1 l p, usually called control, is a real function the existence of controls steering a given source to a given target or a neighborhood of it. B. Finite1 Weakly-coupled systems in quantum control Nabile Boussa¨id, Marco Caponigro, and Thomas Chambrion

  19. Weak Temperature Dependence of the Free Energy Surface and Folding Pathways of Structured Peptides

    E-Print Network [OSTI]

    Caflisch, Amedeo

    Weak Temperature Dependence of the Free Energy Surface and Folding Pathways of Structured Peptides a thermodynamic description of minima and transi- tion states on the free energy surface, which is determined near equilibrium by counting popula- tions. The free energy surface, plotted as a function of two-order parameters

  20. Applied Radiation and Isotopes 64 (2006) 6062 Weak energy dependence of EBT gafchromic film dose

    E-Print Network [OSTI]

    Yu, K.N.

    2006-01-01T23:59:59.000Z

    , radiation-sensi- tive, polymer between two protective layers of polyester, which allows the filmApplied Radiation and Isotopes 64 (2006) 60­62 Weak energy dependence of EBT gafchromic film dose are common in radiation therapy. r 2005 Elsevier Ltd. All rights reserved. Keywords: Radiochromic film

  1. Measurement of friction noise versus contact area of rough surfaces weakly loaded

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    contact area. The friction-induced vibration is generated by the sliding of two rough surfaces. The normal load is low leading to a weak contact. The normal load and the sliding velocity are maintained constant], friction noises can be classified in two types depending on the contact pressure. When the contact pressure

  2. Evaluation of geogrids for stabilising weak pavement subgrade Xiaochao Tang1

    E-Print Network [OSTI]

    Palomino, Angelica M.

    Evaluation of geogrids for stabilising weak pavement subgrade Xiaochao Tang1 , Ghassan R. Chehab to their effectiveness in the stabilisation of pavement subgrade. Geogrid properties, including aperture size, wide-scale interface test results, including direct shear and pull-out, and accelerated pavement testing (APT) results

  3. Lessons Learned From Previous SSL/TLS Attacks A Brief Chronology Of Attacks And Weaknesses

    E-Print Network [OSTI]

    Lessons Learned From Previous SSL/TLS Attacks A Brief Chronology Of Attacks And Weaknesses in 1994 the Secure Socket Layer (SSL) protocol (later renamed to Transport Layer Security (TLS)) evolved to the de facto standard for securing the transport layer. SSL/TLS can be used for ensuring data

  4. EVN+MERLIN Observations of Radio-Intermediate Quasars: Evidence for Boosted Radio-Weak Quasars

    E-Print Network [OSTI]

    Heino Falcke; Alok Patnaik; William Sherwood

    1996-10-08T23:59:59.000Z

    We present VLBI (EVN+MERLIN) observations of a sample of three low-redshift radio-intermediate PG quasars (RIQ) with flat and variable radio spectrum (III Zw 2, PG 1309+355, PG 2209+184). Their radio-to-optical flux ratio (R) is slightly lower than the average R for steep-spectrum quasars, but their radio spectral properties are those of core-dominated quasars. It was proposed previously that these sources might be relativistically boosted jets in radio-weak quasars. Our VLBI observations now indeed confirm the presence of a high brightness temperature core in all three of these objects --- two of them have lower limits on T_B well in excess of 10^10 Kelvin. Moreover, we find no ``missing-flux'' which means that basically all the flux of these quasars is concentrated in the compact radio core. As the total radio flux is already at the low end for radio-loud quasars, we can place a strong limit on the presence of any extended emission. This limit is consistent with the extended emission in radio-weak quasars, but excludes that the flat-spectrum RIQ reside in typical radio-loud quasars. The observations therefore strongly support the idea that relativistic jets are present in radio-weak quasars and hence that radio-loud and radio-weak quasars have very similar central engines.

  5. Weak law of large numbers for some Markov chains along non homogeneous genealogies

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Weak law of large numbers for some Markov chains along non homogeneous genealogies Vincent Bansaye goes to infinity. It is described by a discrete genealogy which may be time non-homogeneous and we pay of the trait of each individual along this genealogy and may also be time non- homogeneous. Such models

  6. QCD Corrections to Vector Boson Pair Production via Weak Boson Fusion

    E-Print Network [OSTI]

    B. Jager; C. Oleari; D. Zeppenfeld

    2006-08-24T23:59:59.000Z

    NLO-QCD corrections to vector boson pair production via weak boson fusion have recently been calculated and implemented into flexible parton-level Monte-Carlo programs. These allow for the computation of cross sections and kinematical distributions within realistic experimental cuts. We summarize the basic elements of the calculation and review phenomenological results for the LHC.

  7. RECTANGULAR POLYOMINO SET WEAK (1,2)-ACHIEVEMENT GAMES EDGAR FISHER AND NNDOR SIEBEN

    E-Print Network [OSTI]

    Sieben, Nándor

    RECTANGULAR POLYOMINO SET WEAK (1,2)-ACHIEVEMENT GAMES EDGAR FISHER AND NÁNDOR SIEBEN Abstract. achievement games, polyomino. #12;2 EDGAR FISHER AND NÁNDOR SIEBEN P1,1 P2,1 P3,1 P3,2 P4,1 P4,2 P4,3 P4,4 P4

  8. CBER-DETR Nevada Coincident and Leading Employment Weak National Recovery Lengthens Nevada's Employment Recession

    E-Print Network [OSTI]

    Ahmad, Sajjad

    CBER-DETR Nevada Coincident and Leading Employment Indexes1 Weak National Recovery Lengthens Nevada's Employment Recession The Nevada Coincident Employment Index measures the ups and downs of the Nevada economy using an index of employment variables. The Nevada Leading Employment Index also measures the ups

  9. Voltage Stability and Frequency Synchronization of Weak Power Distribution Networks with Inverter-Based

    E-Print Network [OSTI]

    Lemmon, Michael

    a part of microgrids, are incorporated to improve power quality and reliability when disruptions happen of microgrids [13], together with oth- er generation, storage and load units. These microgrid- s are installedVoltage Stability and Frequency Synchronization of Weak Power Distribution Networks with Inverter

  10. Weakly Dispersive Hydraulic Flows in a Contraction -Parametric Solutions and Linear Stability

    E-Print Network [OSTI]

    Ee, Bernard Kuowei

    Weakly Dispersive Hydraulic Flows in a Contraction - Parametric Solutions and Linear Stability typically results is a transition of flow characteristics within the contraction yielding hydraulic flows of the contraction. As considered here, a hydraulic solution is generally one where the fluid response is a function

  11. Systematic Derivation of the Weakly Non-Linear Theory of Thermoacoustic Devices

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Systematic Derivation of the Weakly Non-Linear Theory of Thermoacoustic Devices P.H.M.W. in 't Eindhoven P.O. Box 513, 5600 MB Eindhoven, The Netherlands Abstract Thermoacoustics is the field concerned of thermoacoustic devices: the ther- moacoustic prime mover and the thermoacoustic heat pump or refrigerator. Two

  12. Structural response of nematic liquid crystals to weak transient shear flows

    E-Print Network [OSTI]

    Mather, Patrick T.

    dynamic director response of nematics to oscillatory shearand step shear strain. In oscillation, the ratioStructural response of nematic liquid crystals to weak transient shear flows P. T. Matherajpb is presentedfor director field relaxationfollowing distortion induced by a step strain. Step strainexperimentson 5

  13. Subaru Weak Lensing Measurements of Four Strong Lensing Clusters: Are Lensing Clusters Over-Concentrated?

    SciTech Connect (OSTI)

    Oguri, Masamune; Hennawi, Joseph F.; Gladders, Michael D.; Dahle, Haakon; Natarajan, Priyamvada; Dalal, Neal; Koester, Benjamin P.; Sharon, Keren; Bayliss, Matthew

    2009-01-29T23:59:59.000Z

    We derive radial mass profiles of four strong lensing selected clusters which show prominent giant arcs (Abell 1703, SDSS J1446+3032, SDSS J1531+3414, and SDSS J2111-0115), by combining detailed strong lens modeling with weak lensing shear measured from deep Subaru Suprime-cam images. Weak lensing signals are detected at high significance for all four clusters, whose redshifts range from z = 0.28 to 0.64. We demonstrate that adding strong lensing information with known arc redshifts significantly improves constraints on the mass density profile, compared to those obtained from weak lensing alone. While the mass profiles are well fitted by the universal form predicted in N-body simulations of the {Lambda}-dominated cold dark matter model, all four clusters appear to be slightly more centrally concentrated (the concentration parameters c{sub vir} {approx} 8) than theoretical predictions, even after accounting for the bias toward higher concentrations inherent in lensing selected samples. Our results are consistent with previous studies which similarly detected a concentration excess, and increases the total number of clusters studied with the combined strong and weak lensing technique to ten. Combining our sample with previous work, we find that clusters with larger Einstein radii are more anomalously concentrated. We also present a detailed model of the lensing cluster Abell 1703 with constraints from multiple image families, and find the dark matter inner density profile to be cuspy with the slope consistent with -1, in agreement with expectations.

  14. Policy Research Working Paper 4844, World Bank, Washington DC, April 2009 Weakly Relative Poverty

    E-Print Network [OSTI]

    Krivobokova, Tatyana

    Policy Research Working Paper 4844, World Bank, Washington DC, April 2009 Weakly Relative Poverty, 20433, USA Abstract: Prevailing measures of relative poverty are unchanged when all incomes grow that relax these assumptions. On calibrating our measures to national poverty lines and survey data, we find

  15. Global weak solutions to magnetic fluid flows with nonlinear Maxwell-Cattaneo heat transfer law

    E-Print Network [OSTI]

    Boyer, Edmond

    Global weak solutions to magnetic fluid flows with nonlinear Maxwell-Cattaneo heat transfer law F transfer in a magnetic fluid flow under the action of an applied magnetic field. Instead of the usual heat-Cattaneo law, heat transfer, magnetic field, magnetization AMS subject classifications: 76N10, 35Q35. 1

  16. Shock Wave Impact on Weak Concrete , K.D. Gardner1

    E-Print Network [OSTI]

    Texas at Arlington, University of

    . The major effect of a terrorist-type bomb is from the blast, particularly from blast wave reflection when. This paper reports on the use of a shock wave to simulate the effect of a blast wave on weak concrete. A high/19, Moscow, Russia Abstract. A blast wave front possesses characteristics similar to a shock wave created

  17. WEAK SIGNAL DETECTION IN HYPERSPECTRAL IMAGERY USING SPARSE MATRIX TRANSFORM (SMT) COVARIANCE ESTIMATION

    E-Print Network [OSTI]

    WEAK SIGNAL DETECTION IN HYPERSPECTRAL IMAGERY USING SPARSE MATRIX TRANSFORM (SMT) COVARIANCE. In this paper, we describe the sparse matrix transform (SMT) and investigate its utility for estimating the covariance matrix from a limited number ofsamples. The SMT is formed by a product of pairwise coordinate

  18. WeaklyPrivate Secret Sharing Schemes # Amos Beimel 1 and Matthew Franklin 2

    E-Print Network [OSTI]

    Beimel, Amos

    Weakly­Private Secret Sharing Schemes # Amos Beimel 1 and Matthew Franklin 2 1 Department. Abstract. Secret­sharing schemes are an important tool in cryptogra­ phy that is used in the construction of many secure protocols. However, the shares' size in the best known secret­sharing schemes realizing gen

  19. The full weak charge density distribution of 48Ca from parity violating electron scattering

    E-Print Network [OSTI]

    Lin, Z

    2015-01-01T23:59:59.000Z

    Background: The ground state neutron density of a medium mass nucleus contains fundamental nuclear structure information and is at present relatively poorly known. Purpose: We explore if parity violating elastic electron scattering can provide a feasible and model independent way to determine not just the neutron radius but the full radial shape of the neutron density $\\rho_n(r)$ and the weak charge density $\\rho_W(r)$ of a nucleus. Methods: We expand the weak charge density of $^{48}$Ca in a model independent Fourier Bessel series and calculate the statistical errors in the individual coefficients that might be obtainable in a model parity violating electron scattering experiment. Results: We find that it is feasible to determine roughly six Fourier Bessel coefficients of the weak charge density of 48Ca within a reasonable amount of beam time. However, it would likely be much harder to determine the full weak density of a significantly heavier nucleus such as 208Pb. Conclusions: Parity violating elastic elec...

  20. Generation of strong mesoscale eddies by weak ocean gyres by Michael A. Spall1

    E-Print Network [OSTI]

    Generation of strong mesoscale eddies by weak ocean gyres by Michael A. Spall1 ABSTRACT The generation of strong mesoscale variability through instability of the large-scale circulation in the interior with the scaling theory. 1. Introduction It is now well recognized that the kinetic energy of the mesoscale

  1. Weak solutions to the Landau-Lifshitz-Maxwell system with nonlinear Neumann boundary

    E-Print Network [OSTI]

    Boyer, Edmond

    ferromagnetic body when super-exchange and sur- face anisotropy interactions are present in the spacer in prove, in three dimensions, the existence of global weak solutions to the Landau-Lifshitz-Maxwell sys2 norm over a measurable set A, we use instead the · L2(A) notation. 2 Geometry of spacers

  2. Evolving a robust signal transduction pathway from weak cross-talk

    E-Print Network [OSTI]

    Siryaporn, Albert

    We have evolved a robust two?component signal transduction pathway from a sensor kinase (SK) and non?partner response regulator (RR) that show weak cross?talk in vitro and no detectable cross?talk in vivo in wild?type ...

  3. Evolving a robust signal transduction pathway from weak cross-talk

    E-Print Network [OSTI]

    Siryaporn, Albert

    We have evolved a robust two-component signal transduction pathway from a sensor kinase (SK) and non-partner response regulator (RR) that show weak cross-talk in vitro and no detectable cross-talk in vivo in wild-type ...

  4. Video Object Discovery and Co-segmentation with Extremely Weak Supervision

    E-Print Network [OSTI]

    Cortes, Corinna

    Video Object Discovery and Co-segmentation with Extremely Weak Supervision Le Wang , Gang Hua of Technology Google Research Abstract. Video object co-segmentation refers to the problem of simultaneous- ly segmenting a common category of objects from multiple videos. Most existing video co-segmentation methods

  5. Focal mechanisms produced by shear faulting in weakly transversely isotropic crustal rocks

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    . The formulas for percentages of the ISO and CLVD are simplified under the assumption of weak transverse mechanisms can be determined for microearthquakes in- duced in reservoirs during gas or oil production computed and inter- preted under the assumption of an isotropic medium. The geologic structures

  6. BP Texas City accident: weak signais or sheer power? Jean Christophe Le Coze,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BP Texas City accident: weak signais or sheer power? Jean Christophe Le Coze, Research the interprétation of the BP Texas City accident. While bringing a lot of empirical data on a wide range for sensitising the data. It however clearly indicated a référence to the Columbia Accident Investigation Board

  7. An evaluation of known remaining oil resources in the United States: Project on advanced oil recovery and the states. Volume 1

    SciTech Connect (OSTI)

    Not Available

    1994-10-01T23:59:59.000Z

    The Interstate Oil and Gas Compact Commission (IOGCC) has conducted a series of studies to evaluate the known, remaining oil resource in twenty-three (23) states. The primary objective of the IOGCC`s effort is to examine the potential impact of an aggressive and focused program of research, development, and demonstration (RD&D) and technology transfer on future oil recovery in the United States. As part of a larger effort by the IOGCC, this report focuses on the potential economic, social, and political benefits of improved oil recovery to the nation as a whole. Individual reports for major oil producing states have been separately published. The individual state reports include California, Illinois, Kansas, Louisiana, New Mexico, Oklahoma, Texas, and Wyoming. The analysis presented in this report is based on the databases and models available in the Tertiary Oil Recovery Information System (TORIS). TORIS is a tested and verified system maintained and operated by the Department of Energy`s Bartlesville Project Office. The TORTS system was used to evaluate over 2,300 major reservoirs in a consistent manner and on an individual basis, the results of which have been aggregated to arrive at the national total.

  8. Energy-Constrained Scheduling for Weakly-Hard Real-Time Systems Tarek A. AlEnawy and Hakan Aydin

    E-Print Network [OSTI]

    Aydin, Hakan

    a different type of problem. In the energy-constrained settings, the energy is more than an important designEnergy-Constrained Scheduling for Weakly-Hard Real-Time Systems Tarek A. AlEnawy and Hakan Aydin energy budget during an operation/mission. We adopt the weakly-hard real- time scheduling paradigm

  9. A Continuous-State Coalescent and the Impact of Weak Selection on the Structure of Gene Genealogies

    E-Print Network [OSTI]

    Adler, Fred

    A Continuous-State Coalescent and the Impact of Weak Selection on the Structure of Gene Genealogies for understanding the shape of gene genealogies and resulting patterns of genetic diversity. However, the coalescent words: coalescent, weak selection, gene genealogies, interference,multisite selection. Researcharticle

  10. A Primer for Electro-Weak Induced Low Energy Nuclear Reactions

    E-Print Network [OSTI]

    Y. N. Srivastava; A. Widom; L. Larsen

    2008-10-01T23:59:59.000Z

    In a series of papers, cited in the main body of the paper below, detailed calculations have been presented which show that electromagnetic and weak interactions can induce low energy nuclear reactions to occur with observable rates for a variety of processes. A common element in all these applications is that the electromagnetic energy stored in many relatively slow moving electrons can -under appropriate circumstances- be collectively transferred into fewer, much faster electrons with energies sufficient for the latter to combine with protons (or deuterons, if present) to produce neutrons via weak interactions. The produced neutrons can then initiate low energy nuclear reactions through further nuclear transmutations. The aim of this paper is to extend and enlarge upon various examples analyzed previously, present simplified order of magnitude estimates for each and to illuminate a common unifying theme amongst all of them.

  11. An ultra-weak sector, the strong CP problem and the pseudo-Goldstone dilaton

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Allison, Kyle; Hill, Christopher T.; Ross, Graham G.

    2015-02-01T23:59:59.000Z

    In the context of a Coleman–Weinberg mechanism for the Higgs boson mass, we address the strong CP problem. We show that a DFSZ-like invisible axion model with a gauge-singlet complex scalar field S, whose couplings to the Standard Model are naturally ultra-weak, can solve the strong CP problem and simultaneously generate acceptable electroweak symmetry breaking. The ultra-weak couplings of the singlet S are associated with underlying approximate shift symmetries that act as custodial symmetries and maintain technical naturalness. The model also contains a very light pseudo-Goldstone dilaton that is consistent with cosmological Polonyi bounds, and the axion can be themore »dark matter of the universe. We further outline how a SUSY version of this model, which may be required in the context of Grand Unification, can avoid introducing a hierarchy problem.« less

  12. Experimental Investigation of Weak Non-Mesonic Decay of 10Be(Lambda)Hypernuclei at CEBAF

    E-Print Network [OSTI]

    S. Majewski; L. Majling; A. Margaryan; L. Tang

    2005-08-05T23:59:59.000Z

    Hypernuclei are convenient laboratory to study the baryon-baryon weak interaction and associated effective Hamiltonian. The strangeness changing process, in which a Lambda hyperon converts to a neutron with a release up to 176 MeV, provides a clear signal for a conversion of an s-quark to a d-quark. We propose to perform a non-mesonic weak decay study of 10Be(Lambda)hypernuclei using the (e,eK) reaction. These investigations will fully utilize the unique parameters of the CEBAF CW electron beam and RF system and are enabled by (1) the use of new detector for alpha particles based on the recently developed RF timing technique with picosecond resolution and (2) the small angle and large acceptance kaon spectrometer-HKS in Hall C.

  13. Triggered single photon emitters based on stimulated parametric scattering in weakly nonlinear systems

    E-Print Network [OSTI]

    Kyriienko, Oleksandr

    2014-01-01T23:59:59.000Z

    We introduce a scheme of single photon emission based on four-wave mixing in a three mode system with weak Kerr-type nonlinearity. A highly populated lower energy mode results in strong stimulated scattering of particle pairs out of the central mode, which consequently limits the central mode occupation. Thus, the system can be reduced to a $\\chi^{(2)}$ nonlinear medium with greatly enhanced interaction constant. As a model setup we consider dipolaritons in semiconductor microcavities. Using the master equation approach we show strong antibunching under continuous wave pump, which largely exceeds the conventional blockade mechanism. Finally, using a pulsed excitation we demonstrate theoretically an on-demand single photon emitter in a weakly nonlinear system.

  14. What are the Hidden Quantum Processes In Einstein's Weak Principle of Equivalence?

    E-Print Network [OSTI]

    Ostoma, T; Ostoma, Tom; Trushyk, Mike

    2000-01-01T23:59:59.000Z

    We provide a quantum derivation of Einstein's Weak Equivalence Principle (WEP) of general relativity using a new quantum gravity theory proposed by the authors called Electro-Magnetic Quantum Gravity or EMQG (ref. 1). Newtonian Inertia is a property of matter due to the strictly local electrical force interactions contributed by each of the (electrically charged) elementary particles of the mass with the surrounding (electrically charged) virtual particles (virtual masseons) of the quantum vacuum. The sum of all the tiny electrical forces (photon exchanges with the vacuum particles) originating in each charged elementary particle of the accelerated mass is the source of the total inertial force of a mass which opposes accelerated motion in Newton's law 'F = MA'. We found that gravity also involves the same 'inertial' electromagnetic force component that exists in inertial mass. We propose that Einstein's general relativistic Weak Equivalence Principle (WEP) originates from common 'lower level' quantum vacuum ...

  15. Quasicollapse of oblique solitons of the weakly dissipative derivative nonlinear Schroedinger equation

    SciTech Connect (OSTI)

    Sanchez-Arriaga, G.; Laveder, D.; Passot, T.; Sulem, P. L. [Departamento de Fisica Aplicada, Escuela Tecnica Superior de Ingenieros Aeronauticos, Universidad Politecnica de Madrid, Plaza de Cardenal Cisneros 3, 28040 Madrid (Spain); Universite de Nice-Sophia Antipolis, CNRS, Observatoire de la Cote d'Azur, BP 4229, 06304 Nice Cedex 4 (France)

    2010-07-15T23:59:59.000Z

    Numerical integrations of the derivative nonlinear Schroedinger equation for Alfven waves, supplemented by a weak dissipative term (originating from diffusion or Landau damping), with initial conditions in the form of a bright soliton with nonvanishing conditions at infinity (oblique soliton), reveal an interesting phenomenon of 'quasicollapse': as the dissipation parameter is reduced, larger amplitudes are reached and smaller scales are created, but on an increasing time scale. This process involves an early bifurcation of the initial soliton toward a breather that is analyzed by means of a numerical inverse scattering technique. This evolution leads to the formation of persistent dark solitons that are only weakly affected when crossed by the decaying breather which has the form of either a localized structure or an extended wave packet.

  16. Test of weak and strong factorization in nucleus-nucleuscollisions atseveral hundred MeV/nucleon

    SciTech Connect (OSTI)

    La Tessa, Chiara; Sihver, Lembit; Zeitlin, Cary; Miller, Jack; Guetersloh, Stephen; Heilbronn, Lawrence; Mancusi, Davide; Iwata,Yoshiuki; Murakami, Takeshi

    2006-06-21T23:59:59.000Z

    Total and partial charge-changing cross sections have been measured for argon projectiles at 400 MeV/nucleon in carbon, aluminum, copper, tin and lead targets; cross sections for hydrogen were also obtained, using a polyethylene target. The validity of weak and strong factorization properties has been investigated for partial charge-changing cross sections; preliminary cross section values obtained for carbon, neon and silicon at 290 and 400 MeV/nucleon and iron at 400 MeV/nucleon, in carbon, aluminum, copper, tin and lead targets have been also used for testing these properties. Two different analysis methods were applied and both indicated that these properties are valid, without any significant difference between weak and strong factorization. The factorization parameters have then been calculated and analyzed in order to find some systematic behavior useful for modeling purposes.

  17. Gravitational ultrarelativistic spin-orbit interaction and the weak equivalence principle

    E-Print Network [OSTI]

    Roman Plyatsko

    2005-07-07T23:59:59.000Z

    It is shown that the gravitational ultrarelativistic spin-orbit interaction violates the weak equivalence principle in the traditional sense. This fact is a direct consequence of the Mathisson-Papapetrou equations in the frame of reference comoving with a spinning test particle. The widely held assumption that the deviation of a spinning test body from a geodesic trajectory is caused by tidal forces is not correct

  18. A spherically symmetric and stationary universe from a weak modification of general relativity

    E-Print Network [OSTI]

    Christian Corda; Herman J. Mosquera Cuesta

    2009-04-01T23:59:59.000Z

    It is shown that a weak modification of general relativity, in the linearized approach, renders a spherically symmetric and stationary model of the universe. This is due to the presence of a third mode of polarization in the linearized gravity in which a "curvature" energy term is present. Such an energy can, in principle, be identified as the Dark Energy. The model can also help to a better understanding of the framework of the Einstein-Vlasov system.

  19. Sources of contamination to weak lensing three-point statistics: constraints from N-body simulations

    E-Print Network [OSTI]

    Elisabetta Semboloni; Catherine Heymans; Ludovic van Waerbeke; Peter Schneider

    2008-02-27T23:59:59.000Z

    We investigate the impact of the observed correlation between a galaxies shape and its surrounding density field on the measurement of third order weak lensing shear statistics. Using numerical simulations, we estimate the systematic error contribution to a measurement of the third order moment of the aperture mass statistic (GGG) from three-point intrinsic ellipticity correlations (III), and the three-point coupling between the weak lensing shear experienced by distant galaxies and the shape of foreground galaxies (GGI and GII). We find that third-order weak lensing statistics are typically more strongly contaminated by these physical systematics compared to second-order shear measurements, contaminating the measured three-point signal for moderately deep surveys with a median redshift z_m ~ 0.7 by ~ 15%. It has been shown that accurate photometric redshifts will be crucial to correct for this effect, once a model and the redshift dependence of the effect can be accurately constrained. To this end we provide redshift-dependent fitting functions to our results and propose a new tool for the observational study of intrinsic galaxy alignments. For a shallow survey with z_m ~ 0.4 we find III to be an order of magnitude larger than the expected cosmological GGG shear signal. Compared to the two-point intrinsic ellipticity correlation which is similar in amplitude to the two-point shear signal at these survey depths, third order statistics therefore offer a promising new way to constrain models of intrinsic galaxy alignments. Early shallow data from the next generation of very wide weak lensing surveys will be optimal for this type of study.

  20. Forward Compton Scattering with weak neutral current: constraints from sum rules

    E-Print Network [OSTI]

    Gorchtein, Mikhail

    2015-01-01T23:59:59.000Z

    We generalize forward real Compton amplitude to the case of the interference of the electromagnetic and weak neutral current, formulate a low-energy theorem, relate the new amplitudes to the interference structure functions and obtain a new set of sum rules. We address a possible new sum rule that relates the product of the axial charge and magnetic moment of the nucleon to the 0th moment of the structure function $g_5(\

  1. Relative contributions of the weak, main and fission-recycling r-process

    E-Print Network [OSTI]

    S. Shibagaki; T. Kajino; G. J. Mathews; S. Chiba; S. Nishimura; G. Lorusso

    2015-05-09T23:59:59.000Z

    There has been a persistent conundrum in attempts to model the nucleosynthesis of heavy elements by rapid neutron capture (the $r$-process). Although the location of the abundance peaks near nuclear mass numbers 130 and 195 identify an environment of rapid neutron capture near closed nuclear shells, the abundances of elements just above and below those peaks are often underproduced by more than an order of magnitude in model calculations. At the same time there is a debate in the literature as to what degree the $r$-process elements are produced in supernovae or the mergers of binary neutron stars. In this paper we propose a novel solution to both problems. We demonstrate that the underproduction of elements above and below the $r$-process peaks characteristic in the main or weak $r$-process events (like magnetohydrodynamic jets or neutrino-driven winds in core-collapse supernovae) can be supplemented via fission fragment distributions from the recycling of material in a neutron-rich environment such as that encountered in neutron star mergers. In this paradigm, the abundance peaks themselves are well reproduced by a moderately neutron rich, main $r$-process environment such as that encountered in the magnetohydrodynamical jets in supernovae supplemented with a high-entropy, weakly neutron rich environment such as that encountered in the neutrino-driven-wind model to produce the lighter $r$-process isotopes. Moreover, we show that the relative contributions to the $r$-process abundances in both the solar-system and metal-poor stars from the weak, main, and fission-recycling environments required by this proposal are consistent with estimates of the relative Galactic event rates of core-collapse supernovae for the weak and main $r$-process and neutron star mergers for the fission-recycling $r$-process.

  2. Self-Calibration for 3-point Intrinsic Alignment Auto-Correlations in Weak Lensing Surveys

    E-Print Network [OSTI]

    M. A. Troxel; Mustapha Ishak

    2012-03-09T23:59:59.000Z

    The weak lensing signal (cosmic shear) has been shown to be strongly contaminated by the various types of galaxy intrinsic alignment (IA) correlations, which poses a barrier to precision weak lensing measurements. The redshift dependence of the IA signal has been used at the 2-point level to reduce this contamination by only measuring cross-correlations between large redshift bins, which significantly reduces the galaxy intrinsic ellipticity - intrinsic ellipticity (II) correlation. A self-calibration technique based on the redshift dependences of the IA correlations has also been proposed as a means to remove the 2-point IA contamination from the lensing signal. We explore here the redshift dependences of the IA and lensing bispectra in order to propose a self-calibration of the IA auto-correlations at the 3-point level (i.e. GGI, GII, and III), which can be well understood without the assumption of any particular IA model. We find that future weak lensing surveys will be able to measure the distinctive IA redshift dependence over ranges of $|\\Delta z^P|\\le 0.2$. Using conservative estimates of photo-z accuracy, we describe the 3-point self-calibration technique for the total IA signal, which can be accomplished through lensing tomography of photo-z bin size $\\sim 0.01$. We find that the 3-point self-calibration can function at the accuracy of the 2-point technique with modest constraints in redshift separation. This allows the 3-point IA auto-correlation self-calibration technique proposed here to significantly reduce the contamination of the IA contamination to the weak lensing bispectrum.

  3. Interaction of impurity ions with a weakly non-Maxwellian simple hydrogenic plasma

    SciTech Connect (OSTI)

    Terry, W.K.

    1988-08-01T23:59:59.000Z

    The average acceleration of an ensemble of ''test particles'' in a plasma is called the ''dynamical friction''; the average rate at which their velocity vectors spread out in velocity space is expressed in a velocity-space diffusion-rate tensor. These quantities are derived for impurity ions interacting with a weakly non-Maxwellian simple hydrogenic plasma. The distribution functions for the plasma ions and electrons are written explicitly. 5 refs., 3 figs.

  4. Generalized strong curvature singularities and weak cosmic censorship in cosmological space-times

    E-Print Network [OSTI]

    W. Rudnicki; R. J. Budzynski; W. Kondracki

    2006-06-01T23:59:59.000Z

    This paper is a further development of the approach to weak cosmic censorship proposed by the authors in Ref. 5. We state and prove a modified version of that work's main result under significantly relaxed assumptions on the asymptotic structure of space--time. The result, which imposes strong constraints on the occurrence of naked singularities of the strong curvature type, is in particular applicable to physically realistic cosmological models.

  5. Next-to-leading order QCD corrections to photon production via weak-boson fusion

    E-Print Network [OSTI]

    B. Jager

    2010-04-06T23:59:59.000Z

    We present a calculation of next-to-leading order QCD corrections to gamma jj production via weak-boson fusion at a hadron collider in the form of a flexible parton-level Monte Carlo program which allows us to study cross sections and distributions within experimentally relevant selection cuts. The radiative corrections are found to be moderate with residual scale uncertainties being considerably improved beyond tree level. The sensitivity of the reaction to anomalous W+ W- gamma couplings is investigated.

  6. Modeling nuclear weak-interaction processes with relativistic energy density functionals

    E-Print Network [OSTI]

    Paar, N; Vale, D; Vretenar, D

    2015-01-01T23:59:59.000Z

    Relativistic energy density functionals have become a standard framework for nuclear structure studies of ground-state properties and collective excitations over the entire nuclide chart. We review recent developments in modeling nuclear weak-interaction processes: charge-exchange excitations and the role of isoscalar proton-neutron pairing, charged-current neutrino-nucleus reactions relevant for supernova evolution and neutrino detectors, and calculation of beta-decay rates for r-process nucleosynthesis.

  7. Parity violation in neutron capture on the proton: determining the weak pion-nucleon coupling

    E-Print Network [OSTI]

    de Vries, J; Meißner, Ulf-G; Nogga, A; Epelbaum, E; Kaiser, N

    2015-01-01T23:59:59.000Z

    We investigate the parity-violating analyzing power in neutron capture on the proton at thermal energies in the framework of chiral effective field theory. By combining this analysis with a previous analysis of parity violation in proton-proton scattering, we are able to extract the size of the weak pion-nucleon coupling constant. The uncertainty is significant and dominated by the experimental error which is expected to be reduced soon.

  8. The Formation and Structure of a Strongly Magnetized Corona above Weakly Magnetized Accretion Disks

    E-Print Network [OSTI]

    K. A. Miller; J. M. Stone

    1999-12-07T23:59:59.000Z

    We use three-dimensional magnetohydrodynamical (MHD) simulations to study the formation of a corona above an initially weakly magnetized, isothermal accretion disk. We also describe a modification to time-explicit numerical algorithms for MHD which enables us to evolve highly stratified disks for many orbital times. We find that MHD turbulence driven by the magnetorotational instability (MRI) produces strong amplification of weak fields within two scale heights of the disk midplane in a few orbital times. About 25 % of the magnetic energy generated by the MRI within two scale heights escapes due to buoyancy, producing a strongly magnetized corona above the disk. Most of the buoyantly rising magnetic energy is dissipated between 3 and 5 scale heights, suggesting the corona will also be hot. The average vertical disk structure consists of a weakly magnetized turbulent core below a strongly magnetized corona which is stable to the MRI. The largescale field structure in both the disk and corona is toroidal. The functional form of the stress is flat within two scale heights, but proportional to the density above two scale heights. For initially weak uniform vertical fields, we find the exponential growth of magnetic field via axisymmetric vertical modes of the MRI produces strongly buoyant sheets of magnetic energy which break the disk apart into horizontal channels. These channels rise several scale heights vertically before the onset of the Parker instability distorts the sheets and allows matter to flow back towards the midplane and reform a disk. We suggest this evolution may be relevant to the dynamical processes which disrupt the inner regions of a disk when it interacts with a strongly magnetized central object.

  9. Rheology of weakly wetted granular materials - a comparison of experimental and numerical data

    E-Print Network [OSTI]

    Ruediger Schwarze; Anton Gladkyy; Fabian Uhlig; Stefan Luding

    2014-09-12T23:59:59.000Z

    Shear cell simulations and experiments of weakly wetted particles (a few volume percent liquid binders) are compared, with the goal to understand their flow rheology. Application examples are cores for metal casting by core shooting made of sand and liquid binding materials. The experiments are carried out with a Couette-like rotating viscometer. The weakly wetted granular materials are made of quartz sand and small amounts of Newtonian liquids. For comparison, experiments on dry sand are also performed with a modified configuration of the viscometer. The numerical model involves spherical, monodisperse particles with contact forces and a simple liquid bridge model for individual capillary bridges between two particles. Different liquid content and properties lead to different flow rheology when measuring the shear stress-strain relations. In the experiments of the weakly wetted granular material, the apparent shear viscosity $\\eta_g$ scales inversely proportional to the inertial number $I$, for all shear rates. On the contrary, in the dry case, an intermediate scaling regime inversely quadratic in $I$ is observed for moderate shear rates. In the simulations, both scaling regimes are found for dry and wet granular material as well.

  10. Mg II Selected Absorbers: Ionization structures and a Survey of Weak Systems

    E-Print Network [OSTI]

    Christopher W. Churchill

    1997-09-12T23:59:59.000Z

    First results from a study of high ionization absorption properties in roughly 30 Mg II absorption selected galaxies are presented. We have tested for correlations of Mg II, C IV, Si IV, N V, and O VI equivalent widths with the galaxy properties and Mg II gas kinematics. The results are suggestive of multi-phase halos with little to no global ionization gradient with impact parameter. C IV may arise in both the Mg II - Lyman alpha clouds and a high ionization "halo" traced by O VI. We also report on an unbiased survey for weak Mg II systems using HIRES/Keck spectra. At = 0.9, we find dN/dz = 1.6 +/- 0.1 for 0.02 = -0.3 +/- 0.4 measured for the sample. We suggest that weak Mg II absorbers comprise a substantial yet-to-be explored population. If weak systems select the LSB and/or dwarf galaxy population, then the weakest Mg II absorbers may provide one of the most sensitive tracers of chemical enrichment and evolution of the UV background from z = 2 to z = 0.

  11. Qweak: First Direct Measurement of the Weak Charge of the Proton

    SciTech Connect (OSTI)

    Nuruzzaman, NFN [Hampton University, JLAB

    2014-04-01T23:59:59.000Z

    The Qweak experiment at Hall C of Thomas Jefferson National Accelerator Facility has made the first direct measurement of the weak charge of the proton, QWp, through a precision measurement of the parity-violating asymmetry in elastic e-p scattering at low momentum transfer Q2= 0.025 (GeV/c)2 with incident electron beam energy of 1.155 GeV. The Qweak experiment, along with earlier results of parity violating elastic scattering experiments, is expected to determine the most precise value of QWp which is suppressed in the Standard Model. If this result is further combined with the 133Cs atomic parity violation (APV) measurement, significant constraints on the weak charge of the up quark, down quark, and neutron can be extracted. This data will also be used to determine the weak-mixing angle, sin2 ?W, with a relative uncertainty of < 0.5% that will provide a competitive measurement of the running of sin2 ?W to low Q2. An overview of the experiment and its results using the commissioning dataset, constituting approximately 4% of the data collected in the experiment, are reported here.

  12. Thermodynamics of large-$N$ gauge theories on a sphere: weak versus strong coupling

    E-Print Network [OSTI]

    Fen Zuo; Yi-Hong Gao

    2015-05-08T23:59:59.000Z

    Recently lattice simulation in pure Yang-Mills theory exposes significant quadratic corrections for both the thermodynamic quantities and the renormalized Polyakov loop in the deconfined phase. These terms are previously found to appear naturally for ${\\mathcal N}=4$ Super Yang-Mills~(SYM) on a sphere at strong coupling, through the gauge/gravity duality. Here we extend the investigation to the weak coupling regime, and for general large-$N$ gauge theories. Employing the matrix model description, we find some novel behavior in the deconfined phase, which is not noticed in the literature. Due to the non-uniform eigenvalue distribution of the holonomy around the time circle, the deviation of the Polyakov loop from one starts from $1/T^3$ instead of $1/T^2$. Such a power is fixed by the space dimension and do not change with different theories. This statement is also true when perturbative corrections to the single-particle partition functions are included. The corrections to the Polyakov loop and higher moments of the distribution function combine to give a universal term, $T/4$, in the free energy. These differences between the weak and strong coupling regime could be easily explained if a strong/weak coupling phase transition occurs in the deconfined phase of large-$N$ gauge theories on a compact manifold.

  13. The Effect of the Cosmic Web on Cluster Weak Lensing Mass Estimates

    E-Print Network [OSTI]

    Christopher A. Metzler; Martin White; Chris Loken

    2001-03-08T23:59:59.000Z

    In modern hierarchical theories of structure formation, rich clusters of galaxies form at the vertices of a weblike distribution of matter, with filaments emanating from them to large distances and with smaller objects forming and draining in along these filaments. The amount of mass contained in structure near the cluster can be comparable to the collapsed mass of the cluster itself. As the lensing kernel is quite broad along the line of sight around cluster lenses with typical redshifts near z=0.5, structures many Mpc away from the cluster are essentially at the same location as the cluster itself, when considering their effect on the cluster's weak lensing signal. We use large-scale numerical simulations of structure formation in a Lambda-dominated cold dark matter model to quantify the effect that large-scale structure near clusters has upon the cluster masses deduced from weak lensing analysis. A correction for the scatter in possible observed lensing masses should be included when interpreting mass functions from weak lensing surveys.

  14. Weak bonding of alumina coatings on Ni(1 1 1) Emily A.A. Jarvis, Asbjorn Christensen, Emily A. Carter *

    E-Print Network [OSTI]

    Carter, Emily A.

    Weak bonding of alumina coatings on Ni(1 1 1) Emily A.A. Jarvis, Asbjorn Christensen, Emily A a marked decrease in the work of adhesion for thicker alumina coatings. This provides a new atomic

  15. Search for Supersymmetry Using Weak Boson Fusion Processes in Proton-Proton Collisions at the Large Hadron Collider 

    E-Print Network [OSTI]

    Flanagan, Will

    2014-08-08T23:59:59.000Z

    various Standard Model processes as well as searching for Beyond the Standard Model processes through a plethora of distinct projects. This dissertation searches for Supersymmetry using weak boson fusion processes. These processes provide a unique...

  16. Electron temperature fluctuations associated with the weakly coherent mode in the edge of I-mode plasmas

    E-Print Network [OSTI]

    Phillips, P.

    New measurements of electron temperature fluctuations associated with the weakly coherent mode (WCM) during improved mode, or I-mode plasmas (Whyte et al 2010 Nucl. Fusion. 50 105005) at Alcator C-Mod (Marmar et al 2007 ...

  17. Weakly relativistic quantum kinetic theory for electrostatic wave modes in magnetized plasmas

    SciTech Connect (OSTI)

    Hussain, Azhar [Department of Physics, GC University Lahore, 54000 Lahore (Pakistan)] [Department of Physics, GC University Lahore, 54000 Lahore (Pakistan); Stefan, Martin; Brodin, Gert [Department of Physics, Umeå University, SE-901 87 Umeå (Sweden)] [Department of Physics, Umeå University, SE-901 87 Umeå (Sweden)

    2014-03-15T23:59:59.000Z

    We have derived the electrostatic dispersion relation in a magnetized plasma using a recently developed quantum kinetic model based on the Dirac equation. The model contains weakly relativistic spin effects such as Thomas precession, the polarization currents associated with the spin and the spin-orbit coupling. It turns out that for strictly electrostatic perturbations the non-relativistic spin effects vanish, and the modification of the classical dispersion relation is solely associated with the relativistic terms. Several new wave modes appear due the electron spin effects, and an example for astrophysical plasmas are given.

  18. Imaging the 3-D cosmological mass distribution with weak gravitational lensing

    E-Print Network [OSTI]

    A. N. Taylor

    2001-11-30T23:59:59.000Z

    I show how weak gravitational lensing can be used to image the 3-D mass distribution in the Universe. An inverse relation to the lensing equation, relating the lensing potential evaluated at each source to the full 3-D Newtonian potential, is derived. I consider the normal modes of the lensing problem and clarify the equations using a small-angle approximation. Finally I consider the prospects of using this method to estimate the 3-D matter distribution from a realistic galaxy lensing survey.

  19. Energy band structure and intrinsic coherent properties in two weakly linked Bose Einstein Condensates

    E-Print Network [OSTI]

    Wei-Dong Li; Yunbo Zhang; J. -Q. Liang

    2003-05-21T23:59:59.000Z

    The energy band structure and energy splitting due to quantum tunneling in two weakly linked Bose-Einstein condensates were calculated by using the instanton method. The intrinsic coherent properties of Bose Josephson junction were investigated in terms of energy splitting. For $E_{C}/E_{J}\\ll 1$, the energy splitting is small and the system is globally phase coherent. In the opposite limit, $E_{C}/E_{J}\\gg 1$, the energy splitting is large and the system becomes a phase dissipation. Our reslults suggest that one should investigate the coherence phenomna of BJJ in proper condition such as $E_{C}/E_{J}\\sim 1$.

  20. Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

    E-Print Network [OSTI]

    UCNA Collaboration; J. Liu; M. P. Mendenhall; A. T. Holley; H. O. Back; T. J. Bowles; L. J. Broussard; R. Carr; S. Clayton; S. Currie; B. W. Filippone; A. Garcia; P. Geltenbort; K. P. Hickerson; J. Hoagland; G. E. Hogan; B. Hona; T. M. Ito; C. -Y. Liu; M. Makela; R. R. Mammei; J. W. Martin; D. Melconian; C. L. Morris; R. W. Pattie Jr.; A. Perez Galvan; M. L. Pitt; B. Plaster; J. C. Ramsey; R. Rios; R. Russell; A. Saunders; S. J. Seestrom; W. E. Sondheim; E. Tatar; R. B. Vogelaar; B. VornDick; C. Wrede; H. Yan; A. R. Young

    2010-09-25T23:59:59.000Z

    A precise measurement of the neutron decay $\\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0 = -0.11966 \\pm 0.00089_{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V = -1.27590_{-0.00445}^{+0.00409}$.

  1. Determination of the Axial-Vector Weak Coupling Constant with Polarized Ultracold Neutrons

    E-Print Network [OSTI]

    Liu, J; Holley, A T; Back, H O; Bowles, T J; Broussard, L J; Carr, R; Clayton, S; Currie, S; Filippone, B W; Garcia, A; Geltenbort, P; Hickerson, K P; Hoagland, J; Hogan, G E; Hona, B; Ito, T M; Liu, C -Y; Makela, M; Mammei, R R; Martin, J W; Melconian, D; Morris, C L; Pattie, R W; Galvan, A Perez; Pitt, M L; Plaster, B; Ramsey, J C; Rios, R; Russell, R; Saunders, A; Seestrom, S; Sondheim, W E; Tatar, E; Vogelaar, R B; VornDick, B; Wrede, C; Yan, H; Young, A R

    2010-01-01T23:59:59.000Z

    A precise measurement of the neutron decay $\\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0 = -0.11966 \\pm 0.00089 _{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V = -1.27590 _{-0.00445}^{+0.00409}$.

  2. Perturbative analysis of sheared flow Kelvin-Helmholtz instability in a weakly relativistic magnetized electron fluid

    SciTech Connect (OSTI)

    Sundar, Sita; Das, Amita; Kaw, Predhiman [Institute for Plasma Research, Bhat, Gandhinagar-382428 (India)

    2012-05-15T23:59:59.000Z

    In the interaction of intense lasers with matter/plasma, energetic electrons having relativistic energies get created. These energetic electrons can often have sheared flow profiles as they propagate through the plasma medium. In an earlier study [Phys. Plasmas 17, 022101 (2010)], it was shown that a relativistic sheared electron flow modifies the growth rate and threshold condition of the conventional Kelvin-Helmholtz instability. A perturbative analytic treatment for the case of weakly relativistic regime has been provided here. It provides good agreement with the numerical results obtained earlier.

  3. Search for Low-Mass Weakly Interacting Massive Particles with SuperCDMS

    SciTech Connect (OSTI)

    Agnese, R.; Anderson, Alan J.; Asai, M.; balakishiyeva, D.; Basu Thakur, R.; Bauer, D. A.; Beaty, John; Billard, J.; Borgland, A.; Bowles, M. A.; Brandt, D.; Brink, P. L.; Bunker, R.; Cabrera, B.; Caldwell, D. O.; Cerdeno, D. G.; Chagani, H.; Chen, Y.; Cherry, M.; Cooley, J.; Cornell, B.; Crewdson, C. H.; Cushman, Priscilla B.; Daal, M.; DeVaney, D.; DeStefano, PC F.; Do Couto E Silva, E.; Doughty, T.; Esteban, L.; Fallows, S.; Figueroa-Feliciano, E.; Godfrey, G. L.; Golwala, S. R.; Hall, Jeter C.; Hansen, S.; Harris, Harold R.; Hertel, S. A.; Hines, B. A.; Hofer, T.; Holmgren, D.; Hsu, L.; Huber, M. E.; Jastram, A.; Kamaev, O.; Kara, B.; Kelsey, M. H.; Kenany, S.; Kennedy, A.; Kiveni, M.; Koch, K.; Leder, A.; Loer, B.; Lopez Asamar, E.; Mahapatra, R.; Mandic, V.; Martinez, C.; McCarthy, K. A.; Mirabolfathi, M.; Moffatt, R. A.; Nelson, R. H.; Novak, L.; Page, K.; Partridge, R.; Pepin, M.; Phipps, A.; Platt, M.; Prasad, K.; Pyle, M.; Qiu, H.; Rau, W.; Redl, P.; Reisetter, A.; Resch, R. W.; Ricci, Y.; Ruschman, M.; Saab, T.; Sadoulet, B.; Sander, J.; Schmitt, R.; Schneck, K.; Schnee, Richard; Scorza, A.; Seitz, D.; Serfass, B.; Shank, B.; Speller, D.; Tomada, A.; Upadhyayula, S.; Villano, A. N.; Welliver, B.; Wright, D. H.; Yellin, S.; Yen, J. J.; Young, B. A.; Zhang, J.

    2014-06-01T23:59:59.000Z

    We report a first search for weakly interacting massive particles (WIMPs) using the background rejection capabilities of SuperCDMS. An exposure of 577 kg-days was analyzed for WIMPs with mass < 30 GeV/c2, with the signal region blinded. Eleven events were observed after unblinding. We set an upper limit on the spin-independent WIMP-nucleon cross section of 1:2 10-42cm2 at 8 GeV/c2. This result is in tension with WIMP interpretations of recent experiments and probes new parameter space for WIMP-nucleon scattering for WIMP masses < 6 GeV/c2.

  4. A quantum weak energy inequality for the Dirac field in two-dimensional flat spacetime

    E-Print Network [OSTI]

    S. P. Dawson

    2005-12-14T23:59:59.000Z

    Fewster and Mistry have given an explicit, non-optimal quantum weak energy inequality that constrains the smeared energy density of Dirac fields in Minkowski spacetime. Here, their argument is adapted to the case of flat, two-dimensional spacetime. The non-optimal bound thereby obtained has the same order of magnitude, in the limit of zero mass, as the optimal bound of Vollick. In contrast with Vollick's bound, the bound presented here holds for all (non-negative) values of the field mass.

  5. Search for Light Higgs Boson at LHC via Production Through Weak Boson Fusion

    E-Print Network [OSTI]

    K. Mazumdar

    2003-08-29T23:59:59.000Z

    The LHC potential for observing a light Higgs boson produced through Weak Boson Fusion mode, ${\\rm qq}\\to {\\rm qqH}$, is presented. For non-hadronic decays modes of the Higgs boson the process is identified with a final state containing two energetic forward-backward jets, separated with a large rapidity and a hadronically quiet central region. The use of these properties, combined with special features of some of the decay modes enhances the potential of an early discovery of a light Higgs boson both in the Standard Model and beyond. The recent studies done in the context of CMS experiment are discussed.

  6. Semiclassical treatment of fusion processes in collisions of weakly bound nuclei

    E-Print Network [OSTI]

    L. F. Canto; R. Donangelo; H. D. Marta

    2005-09-23T23:59:59.000Z

    We describe a semiclassical treatment of nuclear fusion reactions involving weakly bound nuclei. In this treatment, the complete fusion probabilities are approximated by products of two factors: a tunneling probability and the probability that the system is in its ground state at the strong absorption radius. We investigate the validity of the method in a schematic two-channel application, where the channels in the continuum are represented by a single resonant state. Comparisons with full coupled-channels calculations are performed. The agreement between semiclassical and quantal calculations isquite good, suggesting that the procedure may be extended to more sophisticated discretizations of the continuum.

  7. Nuclear Matter Incompressibility Effect on the Cross Section of Fusion Reactions with a weakly bound projectile

    E-Print Network [OSTI]

    S. A. Seyyedi; H. Golnarkar

    2015-01-19T23:59:59.000Z

    Fusion reactions with a weakly bound projectile are studied using the double-folding model along with a repulsive interaction modifying term. Using this modified potential, including nuclear matter incompressibility effects, the fusion reaction cross sections and suppression parameters are calculated for 9Be +209Bi,208Pb,29Si and 27Al reactions. The results show that applying these effects at energies near the Coulomb barrier improves the agreement between the calculated and experimental cross sections, and modifies the mean values of the suppression parameter.

  8. Nuclear Matter Incompressibility Effect on the Cross Section of Fusion Reactions with a weakly bound projectile

    E-Print Network [OSTI]

    Seyyedi, S A

    2015-01-01T23:59:59.000Z

    Fusion reactions with a weakly bound projectile are studied using the double-folding model along with a repulsive interaction modifying term. Using this modified potential, including nuclear matter incompressibility effects, the fusion reaction cross sections and suppression parameters are calculated for 9Be +209Bi,208Pb,29Si and 27Al reactions. The results show that applying these effects at energies near the Coulomb barrier improves the agreement between the calculated and experimental cross sections, and modifies the mean values of the suppression parameter.

  9. Frequency response of an atomic resonance driven by weak free-electron-laser fluctuating pulses

    E-Print Network [OSTI]

    G M Nikolopoulos; P Lambropoulos

    2014-01-20T23:59:59.000Z

    Motivated by recent experiments pertaining to the interaction of weak SASE-FEL pulses with atoms and molecules, we investigate the conditions under which such interactions can be described in the framework of a simple phase-diffusion model with decorrelated atom-field dynamics. The nature of the fluctuations that are inevitably present in SASE-FEL pulses is shown to play a pivotal role in the success of the decorrelation. Our analysis is performed in connection with specific recent experimental results from FLASH in the soft X-ray regime.

  10. Why do we observe a weak force? The hierarchy problem in the multiverse

    E-Print Network [OSTI]

    Oram Gedalia; Alejandro Jenkins; Gilad Perez

    2011-06-27T23:59:59.000Z

    Unless the scale of electroweak symmetry breaking is stabilized dynamically, most of the universes in a multiverse theory will lack an observable weak nuclear interaction. Such "weakless universes" could support intelligent life based on organic chemistry, as long as other parameters are properly adjusted. By taking into account the seemingly-unrelated flavor dynamics that address the hierarchy of quark masses and mixings, we show that such weakless (but hospitable) universes can be far more common than universes like ours. The gauge hierarchy problem therefore calls for a dynamical (rather than anthropic) solution.

  11. Testing the Standard Model by precision measurement of the weak charges of quarks

    SciTech Connect (OSTI)

    Ross Young; Roger Carlini; Anthony Thomas; Julie Roche

    2007-05-01T23:59:59.000Z

    In a global analysis of the latest parity-violating electron scattering measurements on nuclear targets, we demonstrate a significant improvement in the experimental knowledge of the weak neutral-current lepton-quark interactions at low-energy. The precision of this new result, combined with earlier atomic parity-violation measurements, limits the magnitude of possible contributions from physics beyond the Standard Model - setting a model-independent, lower-bound on the scale of new physics at ~1 TeV.

  12. Shear Viscosity in Weakly Coupled N-Component Scalar Field Theories

    E-Print Network [OSTI]

    Jiunn-Wei Chen; Mei Huang; Chang-Tse Hsieh; Han-Hsin Lin

    2010-11-18T23:59:59.000Z

    The rich phenomena of the shear viscosity (eta) to entropy density (s) ratio, eta/s, in weakly coupled N-component scalar field theories are studied. eta/s can have a "double dip" behavior due to resonances and the phase transition. If an explicit goldstone mass term is added, then eta/s can either decrease monotonically in temperature or, as seen in many other systems, reach a minimum at the phase transition. We also show how to go beyond the original variational approach to make the Boltzmann equation computation of eta systematic.

  13. Field theory and weak Euler-Lagrange equation for classical particle-field systems

    SciTech Connect (OSTI)

    Qin, Hong [PPPL; Burby, Joshua W [PPPL; Davidson, Ronald C [PPPL

    2014-10-01T23:59:59.000Z

    It is commonly believed that energy-momentum conservation is the result of space-time symmetry. However, for classical particle-field systems, e.g., Klimontovich-Maxwell and Klimontovich- Poisson systems, such a connection hasn't been formally established. The difficulty is due to the fact that particles and the electromagnetic fields reside on different manifolds. To establish the connection, the standard Euler-Lagrange equation needs to be generalized to a weak form. Using this technique, energy-momentum conservation laws that are difficult to find otherwise can be systematically derived.

  14. A Lorentz-Poincaré type interpretation of the Weak Equivalence Principle

    E-Print Network [OSTI]

    Jan; Broekaert

    2007-03-22T23:59:59.000Z

    The validity of the Weak Equivalence Principle relative to a local inertial frame is detailed in a scalar-vector gravitation model with Lorentz-Poincar\\'e type interpretation. Given the previously established first Post-Newtonian concordance of dynamics with General Relativity, the principle is to this order compatible with GRT. The gravitationally modified Lorentz transformations, on which the observations in physical coordinates depend, are shown to provide a physical interpretation of \\emph{parallel transport}. A development of ``geodesic'' deviation in terms of the present model is given as well.

  15. Estimation of temporal separation of slow light pulses in atomic vapors by weak measurement

    E-Print Network [OSTI]

    Pardeep Kumar; Shubhrangshu Dasgupta

    2015-03-16T23:59:59.000Z

    We show how two circular polarization components of a linearly polarized pulse, propagating through a coherently driven dilute atomic vapor, can be well resolved in time domain by weak measurement. Slower group velocity of one of the components due to electromagnetically induced transparency leads to a differential group delay between the two components. For low number density, this delay may not be large enough to temporally resolve the two components. We show how this can be enhanced in terms of mean time of arrival of the output pulse through a post-selected polarizer. We demonstrate the idea with all the analytical and numerical results, with a specific example of alkali atoms.

  16. Neutral weak-current two-body contributions in inclusive scattering from {sup 12}C

    SciTech Connect (OSTI)

    Lovato, Alessandro [ANL; Gandolfi, Stefano [LANL; Carlson, Joseph [LANL; Pieper, S. C. [ANL; Schiavilla, Rocco [JLAB, ODU

    2014-05-01T23:59:59.000Z

    An {\\it ab initio} calculation of the sum rules of the neutral weak response functions in $^{12}$C is reported, based on a realistic Hamiltonian, including two- and three-nucleon potentials, and on realistic currents, consisting of one- and two-body terms. We find that the sum rules of the response functions associated with the longitudinal and transverse components of the (space-like) neutral current are largest and that a significant portion ($\\simeq 30$\\%) of the calculated strength is due to two-body terms. This fact may have implications for the MiniBooNE and other neutrino quasi-elastic scattering data on nuclei.

  17. Common Correlated Effects Estimation of Heterogeneous Dynamic Panel Data Models with Weakly Exogenous Regressors

    E-Print Network [OSTI]

    Pesaran, Hashem; Chudik, Alexander

    2013-05-16T23:59:59.000Z

    ; , xi` = x` + #17;i; x`, #17;i; x` #24; IIDN #0; 0; #27;2 x` #1; , gi` = g` + #17;i; g`, #17;i; g` #24; IIDN #0; 0; #27;2 g` #1; for ` = 1; 2; ::;m; and i = 1; 2; :::; N . Also, without loss of generality, the factor loadings are calibrated so that V... , are generated to be heteroskedastic and weakly cross- sectionally dependent. Speci?cally, we adopt the following spatial autoregressive model (SAR) to generate "t = ("1t; "2t; :::; "Nt)0: "t = a"S""t + e"t, (39) 19 where the elements of e"t are drawn as IIDN #0...

  18. EMTP modeling of CIGRE benchmark based HVDC transmission system operating with weak AC systems

    SciTech Connect (OSTI)

    Sood, V.K. [Hydro-Quebec, Varennes, Quebec (Canada); Khatri, V.; Jin, H. [Concordia Univ., Montreal, Quebec (Canada). Dept. of Electrical and Computer Engineering

    1995-12-31T23:59:59.000Z

    An EMTP based study of a CIGRE benchmark based HVDC system operating with weak ac systems is carried out. The modeled system provides a starting point for (a) educators teaching HVDC transmission courses and (b) for utility planners to develop their own low-cost dedicated digital simulators for training purposes. In this paper, modeling details of the ac-dc system, dc converters and control are presented. To validate the control schemes presented, the HVDC system is tested under ac-dc fault conditions. Results obtained from an EMTP-based study under these fault conditions are also presented in this paper.

  19. Dynamic performance of a STATCON at an HVDC inverter feeding a very weak AC system

    SciTech Connect (OSTI)

    Zhuang, Y.; Menzies, R.W. [Univ. of Manitoba, Winnipeg, Manitoba (Canada)] [Univ. of Manitoba, Winnipeg, Manitoba (Canada); Nayak, O.B. [HVDC Research Centre, Winnipeg, Manitoba (Canada)] [HVDC Research Centre, Winnipeg, Manitoba (Canada); Turanli, H.M. [Manitoba Hydro, Winnipeg, Manitoba (Canada)] [Manitoba Hydro, Winnipeg, Manitoba (Canada)

    1996-04-01T23:59:59.000Z

    This paper investigates the dynamic performance of the advanced static var compensator or STATCON at a high voltage direct current (HVDC) converter terminal where the ac system has a very low short circuit ratio (SCR). The STATCON is based on a nine-level GTO thyristor inverter. The studies include operating characteristics of the STATCON under various ac and dc disturbances. The simulation results are compared with other types of reactive power compensation options available for such applications. It is shown that the STATCON has clear advantages over the other compensators, in areas such as; fault response time, voltage support ability, and dc recovery, while operating with very weak ac systems.

  20. Hard Thermal Loops, Weak Gravitational Fields and The Quark Gluon Energy Momentum Tensor

    E-Print Network [OSTI]

    E. A. Gaffney

    1994-09-13T23:59:59.000Z

    We use an auxiliary field construction to discuss the hard thermal loop effective action associated with massless thermal SU(N) QCD interacting with a weak gravitational field. It is demonstrated that the previous attempt to derive this effective action has only been partially successful and that it is presently only known to first order in the graviton coupling constant. This is still sufficient to enable a calculation of a symmetric traceless quark gluon plasma energy momentum tensor. Finally, we comment on the conserved currents and charges of the derived energy momentum tensor.

  1. CP-odd Weak Basis Invariants for Neutrino Mass Matrices with a Texture Zero and a Vanishing Minor

    E-Print Network [OSTI]

    S. Dev; Shivani Gupta; Radha Raman Gautam

    2010-10-19T23:59:59.000Z

    We construct the $CP$-odd weak basis invariants in the flavor basis for all the phenomenologically viable neutrino mass matrices with a texture zero and a vanishing minor and, also, find the necessary and sufficient conditions for $CP$ invariance . We examine the interrelationships between different $CP$-odd weak basis invariants for these texture structures and investigate their implications for Dirac- and Majorana-type $CP$ violation.

  2. CP-odd Weak Basis Invariants for Neutrino Mass Matrices with a Texture Zero and a Vanishing Minor

    E-Print Network [OSTI]

    Dev, S; Gautam, Radha Raman

    2010-01-01T23:59:59.000Z

    We construct the $CP$-odd weak basis invariants in the flavor basis for all the phenomenologically viable neutrino mass matrices with a texture zero and a vanishing minor and, also, find the necessary and sufficient conditions for $CP$ invariance . We examine the interrelationships between different $CP$-odd weak basis invariants for these texture structures and investigate their implications for Dirac- and Majorana-type $CP$ violation.

  3. Fourier-Transform infrared study of weak adsorption of hydrogen on Pt/SiO sub 2

    SciTech Connect (OSTI)

    Szilagyi, T. (Institute of Isotopes, Budapest (Hungary))

    1990-02-01T23:59:59.000Z

    Infrared spectra of weakly bound hydrogen were studied between 300 and 400 K and 1 to 10{sup 5} Pa. A Temkin-type isotherm was found, indicative of surface heterogeneity. Asymmetric infrared band shapes show that several kinds of weakly bonded hydrogen coexist on the surface, having essentially the same kind of bonding but differing slightly in bond strength. The type of interaction between adsorbed hydrogen and carbon monoxide in the surface layer is also discussed.

  4. X-ray Emission from the Weak-lined T Tauri Binary System KH 15D

    E-Print Network [OSTI]

    William Herbst; Edward C. Moran

    2005-06-08T23:59:59.000Z

    The unique eclipsing, weak-lined T Tauri star KH 15D has been detected as an X-ray source in a 95.7 ks exposure from the Chandra X-ray Observatory archives. A maximum X-ray luminosity of 1.5 x 10^{29} erg s$^{-1}$ is derived in the 0.5--8 keV band, corresponding to L_{X}/L_bol = 7.5 x 10^{-5}. Comparison with samples of stars of similar effective temperature in NGC 2264 and in the Orion Nebula Cluster shows that this is about an order of magnitude low for a typical star of its mass and age. We argue that the relatively low luminosity cannot be attributed to absorption along the line of sight but implies a real deficiency in X-ray production. Possible causes for this are considered in the context of a recently proposed eccentric binary model for KH 15D. In particular, we note that the visible component rotates rather slowly for a weak-lined T Tauri star and has possibly been pseudosynchronized by tidal interaction with the primary near periastron.

  5. Statistical properties of the convergence due to weak gravitational lensing by non-linear structures

    E-Print Network [OSTI]

    P. Valageas

    2000-05-12T23:59:59.000Z

    Density fluctuations in the matter distribution lead to distortions of the images of distant galaxies through weak gravitational lensing effects. This provides an efficient probe of the cosmological parameters and of the density field. In this article, we investigate the statistical properties of the convergence due to weak gravitational lensing by non-linear structures (i.e. we consider small angular windows $\\theta \\la 1'$). Previous studies have shown how to relate the second and third order moments of the convergence to those of the density contrast while models based on the Press-Schechter prescription provide an estimate of the tail of $P(\\kappa)$. Here we present a method to obtain an estimate of the full p.d.f. of the convergence $P(\\kappa)$. It is based on a realistic description of the density field which applies to overdense as well as underdense regions. We show that our predictions agree very well with the results of N-body simulations for the convergence. This could allow one to derive the cosmological parameters $(\\Omega_m,\\Omega_{\\Lambda})$ as well as the full p.d.f. $P(\\delta_R)$ of the density contrast itself in the non-linear regime from observations. Hence this gives a very powerfull tool to constrain scenarios of structure formation.

  6. Gravitational Lensing by Kerr-Sen Dilaton-Axion Black Hole in the Weak Deflection Limit

    SciTech Connect (OSTI)

    Gyulchev, G. N. [Department of Physics, Biophysics and Roentgenology, Faculty of Medicine, St. Kliment Ohridski, University of Sofia, 1 Kozyak str., 1407 Sofia (Bulgaria); Yazadjiev, S. S. [Department of Theoretical Physics, Faculty of Physics, St. Kliment Ohridski University of Sofia, 5 James Bourchier Blvd., 1164 Sofia (Bulgaria)

    2010-11-25T23:59:59.000Z

    We investigate analytically gravitational lensing by charged, stationary, axially symmetric Kerr-Sen dilaton-axion black hole in the weak deflection limit. Approximate solutions to the lightlike equations of motion are present up to and including third-order terms in M/b, a/b and r{sub {alpha}}/b, where M is the black hole mass, a is the angular momentum, r{sub {alpha}}= Q{sup 2}/M,Q being the charge and b is the impact parameter of the light ray. We compute the positions of the two weak field images up to post-Newtonian order. The shift of the critical curves as a function of the lens angular momentum is found, and it is shown that they decrease slightly with the increase of the charge. The lensing observables are compared to these characteristics for particular cases as Schwarzschild and Kerr black holes as well as the Gibbons-Maeda-Garfinkle-Horowitz-Strominger black hole.

  7. Measuring the axial form factor of {sup 3}He using weak capture of polarized electrons

    SciTech Connect (OSTI)

    Dutta, D. [Mississippi State University, Mississippi State, MS 39762 (United States)

    2013-11-07T23:59:59.000Z

    A low energy, high intensity polarized electron beam could enable the extraction of the A=3 weak axial form factors F{sub A} using the reaction ?e+{sup 3}He?{sup 3}H+?. These form factors have never been measured before. We discuss the feasibility of such an experiment using a small toroidal magnet and a radial low energy recoil detector to tag the recoil tritons. A moderately high intensity polarized electron beam (>500 ?A) with beam energies between 50 - 150 MeV is necessary for the cross section measurement and to provides a free clean measurement of the background. Moreover, in addition to the cross section, by measuring the electron spin and recoil triton correlation coefficient it may be possible to search for second class currents and to extract the ratio of the axial to the vector form factor of the nucleon. Such novel electron scattering based measurements would have a completely different set of systematic uncertainties compared to polarized neutron beta decay, neutrino scattering and muon capture experiments which are typically used to extract the weak form-factors.

  8. Searching for the metal-weak thick disc in the solar neighbourhood

    E-Print Network [OSTI]

    Bacham E. Reddy; David L. Lambert

    2008-09-05T23:59:59.000Z

    An abundance analysis is presented of 60 metal-poor stars drawn from catalogues of nearby stars provided by Ariyanto et al. (2005) and Schuster et al. (2006). In an attempt to isolate a sample of metal-weak thick disc stars, we applied the kinematic criteria $V_{\\rm rot} \\geq 100$ km s$^{-1}$, $|U_{LSR}| \\leq 140$ km s$^{-1}$, and $|W_{LSR}| \\leq 100$ km s$^{-1}$. Fourteen stars satisfying these criteria and having [Fe/H] $\\leq -1.0$ are included in the sample of 60 stars. Eight of the 14 have [Fe/H] $\\geq -1.3$ and may be simply thick disc stars of slightly lower than average [Fe/H]. The other six have [Fe/H] from -1.3 to -2.3 and are either metal-weak thick disc stars or halo stars with kinematics mimicking those of the thick disc. The sample of 60 stars is completed by eight thick disc stars, 20 stars of a hybrid nature (halo or thick disc stars), and 18 stars with kinematics distinctive of the halo.

  9. The MOLLER Experiment: An Ultra-Precise Measurement of the Weak Mixing Angle Using Møller Scattering

    E-Print Network [OSTI]

    MOLLER Collaboration; J. Benesch; P. Brindza; R. D. Carlini; J-P. Chen; E. Chudakov; S. Covrig; M. M. Dalton; A. Deur; D. Gaskell; A. Gavalya; J. Gomez; D. W. Higinbotham; C. Keppel; D. Meekins; R. Michaels; B. Moffit; Y. Roblin; R. Suleiman; R. Wines; B. Wojtsekhowski; G. Cates; D. Crabb; D. Day; K. Gnanvo; D. Keller; N. Liyanage; V. V. Nelyubin; H. Nguyen; B. Norum; K. Paschke; V. Sulkosky; J. Zhang; X. Zheng; J. Birchall; P. Blunden; M. T. W. Gericke; W. R. Falk; L. Lee; J. Mammei; S. A. Page; W. T. H. van Oers; K. Dehmelt; A. Deshpande; N. Feege; T. K. Hemmick; K. S. Kumar; T. Kutz; R. Miskimen; M. J. Ramsey-Musolf; S. Riordan; N. Hirlinger Saylor; J. Bessuille; E. Ihloff; J. Kelsey; S. Kowalski; R. Silwal; G. De Cataldo; R. De Leo; D. Di Bari; L. Lagamba; E. NappiV. Bellini; F. Mammoliti; F. Noto; M. L. Sperduto; C. M. Sutera; P. Cole; T. A. Forest; M. Khandekar; D. McNulty; K. Aulenbacher; S. Baunack; F. Maas; V. Tioukine; R. Gilman; K. Myers; R. Ransome; A. Tadepalli; R. Beniniwattha; R. Holmes; P. Souder; D. S. Armstrong; T. D. Averett; W. Deconinck; W. Duvall; A. Lee; M. L. Pitt; J. A. Dunne; D. Dutta; L. El Fassi; F. De Persio; F. Meddi; G. M. Urciuoli; E. Cisbani; C. Fanelli; F. Garibaldi; K. Johnston; N. Simicevic; S. Wells; P. M. King; J. Roche; J. Arrington; P. E. Reimer; G. Franklin; B. Quinn; A. Ahmidouch; S. Danagoulian; O. Glamazdin; R. Pomatsalyuk; R. Mammei; J. W. Martin; T. Holmstrom; J. Erler; Yu. G. Kolomensky; J. Napolitano; K. A. Aniol; W. D. Ramsay; E. Korkmaz; D. T. Spayde; F. Benmokhtar; A. Del Dotto; R. Perrino; S. Barkanova; A. Aleksejevs; J. Singh

    2014-12-03T23:59:59.000Z

    The physics case and an experimental overview of the MOLLER (Measurement Of a Lepton Lepton Electroweak Reaction) experiment at the 12 GeV upgraded Jefferson Lab are presented. A highlight of the Fundamental Symmetries subfield of the 2007 NSAC Long Range Plan was the SLAC E158 measurement of the parity-violating asymmetry $A_{PV}$ in polarized electron-electron (M{\\o}ller) scattering. The proposed MOLLER experiment will improve on this result by a factor of five, yielding the most precise measurement of the weak mixing angle at low or high energy anticipated over the next decade. This new result would be sensitive to the interference of the electromagnetic amplitude with new neutral current amplitudes as weak as $\\sim 10^{-3}\\cdot G_F$ from as yet undiscovered dynamics beyond the Standard Model. The resulting discovery reach is unmatched by any proposed experiment measuring a flavor- and CP-conserving process over the next decade, and yields a unique window to new physics at MeV and multi-TeV scales, complementary to direct searches at high energy colliders such as the Large Hadron Collider (LHC). The experiment takes advantage of the unique opportunity provided by the upgraded electron beam energy, luminosity, and stability at Jefferson Laboratory and the extensive experience accumulated in the community after a round of recent successfully completed parity-violating electron scattering experiments

  10. Positron impact excitations of hydrogen atom embedded in weakly coupled plasmas: Formation of Rydberg atoms

    SciTech Connect (OSTI)

    Rej, Pramit; Ghoshal, Arijit, E-mail: aghoshal@math.buruniv.ac.in [Department of Mathematics, Burdwan University, Golapbag, Burdwan 713 104, West Bengal (India)

    2014-09-15T23:59:59.000Z

    Formation of Rydberg atoms due to 1s?nlm excitations of hydrogen, for arbitrary n, l, m, by positron impact in weakly coupled plasma has been investigated using a distorted-wave theory in the momentum space. The interactions among the charged particles in the plasma have been represented by Debye-Huckel potentials. Making use of a simple variationally determined wave function for the hydrogen atom, it has been possible to obtain the distorted-wave scattering amplitude in a closed analytical form. A detailed study has been made on the effects of plasma screening on the differential and total cross sections in the energy range 20–300?eV of incident positron. For the unscreened case, our results agree nicely with some of the most accurate results available in the literature. To the best of our knowledge, such a study on the differential and total cross sections for 1s?nlm inelastic positron-hydrogen collisions for arbitrary n, l, m in weakly coupled plasmas is the first reported in the literature.

  11. The CERN Resonant Weakly Interacting Sub-eV Particle Search (CROWS)

    E-Print Network [OSTI]

    Betz, Michael; Gasior, Marek; Thumm, Manfred

    The subject of this thesis is the design, implementation and first results of the ``CERN Resonant WISP Search'' (CROWS) experiment, which probes the existence of Weakly Interacting Sub-eV Particles (WISPs) using microwave techniques. Axion Like Particles and Hidden Sector Photons are two well motivated members of the WISP family. Their existence could reveal the composition of cold dark matter in the universe and explain a large number of astrophysical phenomena. Particularly, the discovery of an axion would solve a long standing issue in the standard model, known as the ``strong CP problem''. Despite their strong theoretical motivation, the hypothetical particles have not been observed in any experiment so far. One way to probe the existence of WISPs is to exploit their interaction with photons in a ``light shining through the wall'' experiment. A laser beam is guided through a strong magnetic field in the ``emitting region'' of the experiment. This provides photons, which can convert into hypothetical Axi...

  12. Storage and recall of weak coherent optical pulses with an efficiency of 25%

    E-Print Network [OSTI]

    M. Sabooni; F. Beaudoin; A. Walther; N. Lin; A. Amari; M. Huang; S. Kröll

    2009-12-14T23:59:59.000Z

    We demonstrate experimentally a quantum memory scheme for the storage of weak coherent light pulses in an inhomogeneously broadened optical transition in a Pr^{3+}: YSO crystal at 2.1 K. Precise optical pumping using a frequency stable (about 1kHz linewidth) laser is employed to create a highly controllable Atomic Frequency Comb (AFC) structure. We report single photon storage and retrieval efficiencies of 25%, based on coherent photon echo type re-emission in the forward direction. The coherence property of the quantum memory is proved through interference between a super Gaussian pulse and the emitted echo. Backward retrieval of the photon echo emission has potential for increasing storage and recall efficiency.

  13. Electron density and temperature measurement by continuum radiation emitted from weakly ionized atmospheric pressure plasmas

    SciTech Connect (OSTI)

    Park, Sanghoo; Choe, Wonho, E-mail: wchoe@kaist.ac.kr [Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Youn Moon, Se [High-enthalpy Plasma Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756 (Korea, Republic of); Park, Jaeyoung [5771 La Jolla Corona Drive, La Jolla, CA 92037 (United States)

    2014-02-24T23:59:59.000Z

    The electron-atom neutral bremsstrahlung continuum radiation emitted from weakly ionized plasmas is investigated for electron density and temperature diagnostics. The continuum spectrum in 450–1000?nm emitted from the argon atmospheric pressure plasma is found to be in excellent agreement with the neutral bremsstrahlung formula with the electron-atom momentum transfer cross-section given by Popovi?. In 280–450?nm, however, a large discrepancy between the measured and the neutral bremsstrahlung emissivities is observed. We find that without accounting for the radiative H{sub 2} dissociation continuum, the temperature, and density measurements would be largely wrong, so that it should be taken into account for accurate measurement.

  14. Electron-electron interaction, weak localization and spin valve effect in vertical-transport graphene devices

    SciTech Connect (OSTI)

    Long, Mingsheng; Gong, Youpin; Wei, Xiangfei; Zhu, Chao; Xu, Jianbao; Liu, Ping; Guo, Yufen; Li, Weiwei; Liu, Liwei, E-mail: lwliu2007@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Liu, Guangtong [Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2014-04-14T23:59:59.000Z

    We fabricated a vertical structure device, in which graphene is sandwiched between two asymmetric ferromagnetic electrodes. The measurements of electron and spin transport were performed across the combined channels containing the vertical and horizontal components. The presence of electron-electron interaction (EEI) was found not only at low temperatures but also at moderate temperatures up to ?120?K, and EEI dominates over weak localization (WL) with and without applying magnetic fields perpendicular to the sample plane. Moreover, spin valve effect was observed when magnetic filed is swept at the direction parallel to the sample surface. We attribute the EEI and WL surviving at a relatively high temperature to the effective suppress of phonon scattering in the vertical device structure. The findings open a way for studying quantum correlation at relatively high temperature.

  15. Large-scale weakly nonlinear perturbations of convective magnetic dynamos in a rotating layer

    E-Print Network [OSTI]

    Chertovskih, Roman

    2015-01-01T23:59:59.000Z

    We present a new mechanism for generation of large-scale magnetic field by thermal convection which does not involve the alpha-effect. We consider weakly nonlinear perturbations of space-periodic steady convective magnetic dynamos in a rotating layer that were identified in our previous work. The perturbations have a spatial scale in the horizontal direction that is much larger than the period of the perturbed convective magnetohydrodynamic state. Following the formalism of the multiscale stability theory, we have derived the system of amplitude equations governing the evolution of the leading terms in expansion of the perturbations in power series in the scale ratio. This asymptotic analysis is more involved than in the cases considered earlier, because the kernel of the operator of linearisation has zero-mean neutral modes whose origin lies in the spatial invariance of the perturbed regime, the operator reduced on the generalised kernel has two Jordan normal form blocks of size two, and simplifying symmetri...

  16. Radio emission from weak spherical shocks in the outskirts of galaxy clusters

    E-Print Network [OSTI]

    Kang, Hyesung

    2015-01-01T23:59:59.000Z

    In Kang (2015) we calculated the acceleration of cosmic-ray electrons and the ensuing radio synchrotron emission at weak spherical shocks that are expected to form in the outskirts of galaxy clusters.There we demonstrated that, at decelerating spherical shocks, the volume integrated spectra of both electrons and radiation deviate significantly from the test-particle power-laws predicted for constant planar shocks, because the shock compression ratio and the flux of injected electrons decrease in time. In this study, we consider spherical blast waves propagating into a constant density core surrounded by an isothermal halo with a decreasing density profile in order to explore how the deceleration rate of the shock speed affects the radio emission from accelerated electrons. The surface brightness profile and the volume-integrated radio spectrum of the model shocks are calculated by assuming a ribbon-like shock surface on a spherical shell and the associated downstream region of relativistic electrons. If the p...

  17. Crossover of phase qubit dynamics in presence of negative-result weak measurement

    E-Print Network [OSTI]

    Rusko Ruskov; Ari Mizel; Alexander N. Korotkov

    2006-11-11T23:59:59.000Z

    Coherent dynamics of a superconducting phase qubit is considered in the presence of both unitary evolution due to microwave driving and continuous non-unitary collapse due to negative-result measurement. In the case of a relatively weak driving, the qubit dynamics is dominated by the non-unitary evolution, and the qubit state tends to an asymptotically stable point on the Bloch sphere. This dynamics can be clearly distinguished from conventional decoherence by tracking the state purity and the measurement invariant (``murity''). When the microwave driving strength exceeds certain critical value, the dynamics changes to non-decaying oscillations: any initial state returns exactly to itself periodically in spite of non-unitary dynamics. The predictions can be verified using a modification of a recent experiment.

  18. Precision muon decay measurements and improved constraints on the weak interaction

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Hillairet, A.; Bayes, R.; Bueno, J. F.; Davydov, Yu. I.; Depommier, P.; Faszer, W.; Gagliardi, C. A.; Gaponenko, A.; Gill, D. R.; Grossheim, A.; Gumplinger, P.; Hasinoff, M. D.; Henderson, R. S.; Hu, J.; Koetke, D. D.; MacDonald, R. P.; Marshall, G. M.; Mathie, E. L.; Mischke, R. E.; Olchanski, K.; Olin, A.; Openshaw, R.; Poutissou, J.-M.; Poutissou, R.; Selivanov, V.; Sheffer, G.; Shin, B.; Stanislaus, T. D. S.; Tacik, R.; Tribble, R. E.; TWIST Collaboration

    2012-05-01T23:59:59.000Z

    The TWIST Collaboration has completed its measurement of the three muon decay parameters ? , ? , and P? ? . This paper describes our determination of ? , which governs the shape of the overall momentum spectrum, and ? , which controls the momentum dependence of the parity-violating decay asymmetry. The results are ?=0.749?77±0.000?12(stat)±0.000?23(syst) and ?=0.750?49±0.000?21(stat)±0.000?27(syst) . These are consistent with the value of 3/4 given for both parameters in the standard model, and each is over a factor of 10 more precise than the measurements published prior to TWIST. Our final results on ? , ? , and P? ? have been incorporated into a new global analysis of all available muon decay data, resulting in improved model-independent constraints on the possible weak interactions of right-handed particles.

  19. Mass and Weak Field Limit of Boson Stars in Brans Dicke Gravity

    E-Print Network [OSTI]

    A. W. Whinnett

    1999-06-14T23:59:59.000Z

    We study boson stars in Brans Dicke gravity and use them to illustrate some of the properties of three different mass definitions: the Schwarzschild mass, the Keplerian mass and the Tensor mass. We analyse the weak field limit of the solutions and show that only the Tensor mass leads to a physically reasonable definition of the binding energy. We examine numerically strong field $\\omega=-1$ solutions and show how, in this extreme case, the three mass values and the conserved particle number behave as a function of the central boson field amplitude. The numerical studies imply that for $\\omega=-1$, solutions with extremal Tensor mass also have extremal particle number. This is a property that a physically reasonable definition of the mass of a boson star must have, and we prove analytically that this is true for all values of $\\omega$. The analysis supports the conjecture that the Tensor mass uniquely describes the total energy of an asymptotically flat solution in BD gravity.

  20. Electromagnetic and neutral-weak response functions of 4He and 12C

    E-Print Network [OSTI]

    A. Lovato; S. Gandolfi; J. Carlson; Steven C. Pieper; R. Schiavilla

    2015-01-08T23:59:59.000Z

    Ab initio calculations of the quasi-elastic electromagnetic and neutral-weak response functions of 4He and 12C are carried out for the first time. They are based on a realistic approach to nuclear dynamics, in which the strong interactions are described by two- and three-nucleon potentials and the electroweak interactions with external fields include one- and two-body terms. The Green's function Monte Carlo method is used to calculate directly the Laplace transforms of the response functions, and maximum-entropy techniques are employed to invert the resulting imaginary-time correlation functions with associated statistical errors. The theoretical results, confirmed by experiment in the electromagnetic case, show that two-body currents generate excess transverse strength from threshold to the quasi-elastic to the dip region and beyond. These findings challenge the conventional picture of quasi-elastic inclusive scattering as being largely dominated by single-nucleon knockout processes.

  1. Electromagnetic and neutral-weak response functions of 4He and 12C

    E-Print Network [OSTI]

    Lovato, A; Carlson, J; Pieper, Steven C; Schiavilla, R

    2015-01-01T23:59:59.000Z

    Ab initio calculations of the quasi-elastic electromagnetic and neutral-weak response functions of 4He and 12C are carried out for the first time. They are based on a realistic approach to nuclear dynamics, in which the strong interactions are described by two- and three-nucleon potentials and the electroweak interactions with external fields include one- and two-body terms. The Green's function Monte Carlo method is used to calculate directly the Laplace transforms of the response functions, and maximum-entropy techniques are employed to invert the resulting imaginary-time correlation functions with associated statistical errors. The theoretical results, confirmed by experiment in the electromagnetic case, show that two-body currents generate excess transverse strength from threshold to the quasi-elastic to the dip region and beyond. These findings challenge the conventional picture of quasi-elastic inclusive scattering as being largely dominated by single-nucleon knockout processes.

  2. Determination of the weak charge of the proton through parity violating asymmetry measurements in the elastic e+p scattering

    SciTech Connect (OSTI)

    Subedi, Adesh [Mississippi State University

    2014-12-01T23:59:59.000Z

    The Qweak experiment has taken data to make a 2.5% measurement of parity violating elastic e+p asymmetry in the four momentum transfer region of 0.0250 (GeV/c)^2. This asymmetry is proportional to the weak charge of the proton, which is related to the weak mixing angle, sin^2(theta_W). The final Qweak measurement will provide the most precise measurement of the weak mixing angle below the Z^0 pole to test the Standard Model prediction. A description of the experimental apparatus is provided in this dissertation. The experiment was carried out using a longitudinally polarized electron beam of up to 180 microampere on a 34.5 cm long unpolarized liquid hydrogen target. The Qweak target is not only the world's highest cryogenic target ever built for a parity experiment but also is the least noisy target. This dissertation provides a detailed description of this target and presents a thorough analysis of the target performance. Statistical analysis of Run 1 data, collected between Feb - May 2011, is done to extract a blinded parity violating asymmetry of size -299.7 ± 13.4 (stat.) ± 17.2 (syst.) ± 68 (blinding) parts-per-billion. This resulted in a preliminary proton's weak charge of value 0.0865 ± 0.0085, a 9% measurement. Based on this blinded asymmetry, the weak mixing angle was determined to be sin^2(theta_W) = 0.23429 ± 0.00211.

  3. Weak chaos detection in the Fermi-Pasta-Ulam-$?$ system using $q$-Gaussian statistics

    E-Print Network [OSTI]

    Chris G. Antonopoulos; Helen Christodoulidi

    2011-05-07T23:59:59.000Z

    We study numerically statistical distributions of sums of orbit coordinates, viewed as independent random variables in the spirit of the Central Limit Theorem, in weakly chaotic regimes associated with the excitation of the first ($k=1$) and last ($k=N$) linear normal modes of the Fermi-Pasta-Ulam-$\\alpha$ system under fixed boundary conditions. We show that at low energies ($E=0.19$), when the $k=1$ linear mode is excited, chaotic diffusion occurs characterized by distributions that are well approximated for long times ($t>10^9$) by a $q$-Gaussian Quasi-Stationary State (QSS) with $q\\approx1.4$. On the other hand, when the $k=N$ mode is excited at the same energy, diffusive phenomena are \\textit{absent} and the motion is quasi-periodic. In fact, as the energy increases to $E=0.3$, the distributions in the former case pass through \\textit{shorter} $q$-Gaussian states and tend rapidly to a Gaussian (i.e. $q\\rightarrow 1$) where equipartition sets in, while in the latter we need to reach to E=4 to see a \\textit{sudden transition} to Gaussian statistics, without any passage through an intermediate QSS. This may be explained by different energy localization properties and recurrence phenomena in the two cases, supporting the view that when the energy is placed in the first mode weak chaos and "sticky" dynamics lead to a more gradual process of energy sharing, while strong chaos and equipartition appear abruptly when only the last mode is initially excited.

  4. Fractal Dimensions of a Weakly Clustered Distribution and the Scale of Homogeneity

    E-Print Network [OSTI]

    J. S. Bagla; Jaswant Yadav; T. R. Seshadri

    2008-08-04T23:59:59.000Z

    Homogeneity and isotropy of the universe at sufficiently large scales is a fundamental premise on which modern cosmology is based. Fractal dimensions of matter distribution is a parameter that can be used to test the hypothesis of homogeneity. In this method, galaxies are used as tracers of the distribution of matter and samples derived from various galaxy redshift surveys have been used to determine the scale of homogeneity in the Universe. Ideally, for homogeneity, the distribution should be a mono-fractal with the fractal dimension equal to the ambient dimension. While this ideal definition is true for infinitely large point sets, this may not be realised as in practice, we have only a finite point set. The correct benchmark for realistic data sets is a homogeneous distribution of a finite number of points and this should be used in place of the mathematically defined fractal dimension for infinite number of points (D) as a requirement for approach towards homogeneity. We derive the expected fractal dimension for a homogeneous distribution of a finite number of points. We show that for sufficiently large data sets the expected fractal dimension approaches D in absence of clustering. It is also important to take the weak, but non-zero amplitude of clustering at very large scales into account. In this paper we also compute the expected fractal dimension for a finite point set that is weakly clustered. Clustering introduces departures in the Fractal dimensions from D and in most situations the departures are small if the amplitude of clustering is small. Features in the two point correlation function, like those introduced by Baryon Acoustic Oscillations (BAO) can lead to non-trivial variations in the Fractal dimensions where the amplitude of clustering and deviations from D are no longer related in a monotonic manner.

  5. WEAK LENSING MEASUREMENT OF GALAXY CLUSTERS IN THE CFHTLS-WIDE SURVEY

    SciTech Connect (OSTI)

    Shan Huanyuan; Tao Charling [Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing, 100084 (China); Kneib, Jean-Paul; Jauzac, Mathilde; Limousin, Marceau [Laboratoire d'Astrophysique de Marseille, CNRS-Universite de Provence, 38 rue Frederic Joliot-Curie, F-13388 Marseille Cedex 13 (France); Fan Zuhui [Department of Astronomy, Peking University, Beijing, 100871 (China); Massey, Richard [Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom); Rhodes, Jason [California Institute of Technology, MC 350-17, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Thanjavur, Karun [Canada France Hawaii Telescope, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743 (United States); McCracken, Henry J., E-mail: shanhuany@gmail.com [Institude d'Astrophysique de Paris, UMR 7095, 98 bis Boulevard Arago, F-75014 Paris (France)

    2012-03-20T23:59:59.000Z

    We present the first weak gravitational lensing analysis of the completed Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We study the 64 deg{sup 2} W1 field, the largest of the CFHTLS-Wide survey fields, and present the largest contiguous weak lensing convergence 'mass map' yet made. 2.66 million galaxy shapes are measured, using the Kaiser Squires and Broadhurst Method (KSB) pipeline verified against high-resolution Hubble Space Telescope imaging that covers part of the CFHTLS. Our i'-band measurements are also consistent with an analysis of independent r'-band imaging. The reconstructed lensing convergence map contains 301 peaks with signal-to-noise ratio {nu} > 3.5, consistent with predictions of a {Lambda}CDM model. Of these peaks, 126 lie within 3.'0 of a brightest central galaxy identified from multicolor optical imaging in an independent, red sequence survey. We also identify seven counterparts for massive clusters previously seen in X-ray emission within 6 deg{sup 2} XMM-LSS survey. With photometric redshift estimates for the source galaxies, we use a tomographic lensing method to fit the redshift and mass of each convergence peak. Matching these to the optical observations, we confirm 85 groups/clusters with {chi}{sup 2}{sub reduced} < 3.0, at a mean redshift (z{sub c} ) = 0.36 and velocity dispersion ({sigma}{sub c}) = 658.8 km s{sup -1}. Future surveys, such as DES, LSST, KDUST, and EUCLID, will be able to apply these techniques to map clusters in much larger volumes and thus tightly constrain cosmological models.

  6. Breakdown of the Equivalence between Energy Content and Weight in a Weak Gravitational Field for a Quantum Body

    E-Print Network [OSTI]

    Andrei Lebed

    2012-05-14T23:59:59.000Z

    It is shown that weight operator of a composite quantum body in a weak external gravitational field in the post-Newtonian approximation of the General Relativity does not commute with its energy operator, taken in the absence of the field. Nevertheless, the weak equivalence between the expectations values of weight and energy is shown to survive at a macroscopic level for stationary quantum states for the simplest composite quantum body - a hydrogen atom. Breakdown of the weak equivalence between weight and energy at a microscopic level for stationary quantum states can be experimentally detected by studying unusual electromagnetic radiation, emitted by the atoms, supported and moved in the Earth gravitational field with constant velocity, using spacecraft or satellite. For superpositions of stationary quantum states, a breakdown of the above mentioned equivalence at a macroscopic level leads to time dependent oscillations of the expectation values of weight, where the equivalence restores after averaging over time procedure.

  7. Accounting for Remaining Injected Fracturing Fluid 

    E-Print Network [OSTI]

    Zhang, Yannan

    2013-12-06T23:59:59.000Z

    The technology of multi-stage fracturing of horizontal wells made the development of shale gas reservoirs become greatly successful during the past decades. A large amount of fracturing fluid, usually from 53,000 bbls to 81,400 bbls, is injected...

  8. Accounting for Remaining Injected Fracturing Fluid

    E-Print Network [OSTI]

    Zhang, Yannan

    2013-12-06T23:59:59.000Z

    The technology of multi-stage fracturing of horizontal wells made the development of shale gas reservoirs become greatly successful during the past decades. A large amount of fracturing fluid, usually from 53,000 bbls to 81,400 bbls, is injected...

  9. Animal representations and animal remains at Çatalhöyük

    E-Print Network [OSTI]

    Russell, Nerissa; Meece, Stephanie

    2006-01-01T23:59:59.000Z

    (Level VII). Volcano above town plan, leopard skin above geometric design, or other representations? Level VI paintings lack fully convinc­ ing animal depictions. A patch of painting on the east wall of building VIA.66 includes a number of geomet­ ric... the centrepieces of the north walls of two rather similar buildings. In a sense they parallel the situation in the faunal assemblage, where cattle are not terribly common, but figure prominently in cer­ emonial consumption (see Russell & Martin, Volume 4...

  10. TIPS TO REMAIN SLIM * Set realistic goals.

    E-Print Network [OSTI]

    Srivastava, Kumar Vaibhav

    a week. * Aerobic exercise like jogging, swimming, cycling, running accelerates weight loss. Consult in the morning. * Go for skimmed milk. * As far as possible avoid weight loss supplements. * When you have a physician before starting any weight loss program. Aerobic exercise combined with healthy eating

  11. Geothermal developers remain optimistic | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaefer To: CongestionDevelopment of a downhole wireline tool toEnergyWhile

  12. Los Alamos supercomputer remains fastest in world

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublicexceedsScientists monitorNano 50

  13. Reversing the weak measurement of an arbitrary field with finite photon number 

    E-Print Network [OSTI]

    Sun, Qingqing; Al-Amri, M.; Zubairy, M. Suhail.

    2009-01-01T23:59:59.000Z

    phase qubit was performed. A general procedure for N-dimensional sys- tem was also proposed in #3;12#4;, which requires 2N steps. An important question remains: can we reverse a multidi- mensional state in a simpler way? In Sec. II, we address... is the conclusion. II. SCHEMES The state of interest is an arbitrary cavity field with finite photon number #5;n,m=0nmax #1;nm#6;n#7;#8;m#6;, which is continuously monitored by an ideal photon detector outside. If there is no click, the field evolves into #5;n...

  14. [The Journal of Geology, 2004, volume 112, p. 91110] No copyright is claimed for this article. It remains in the public domain. Geochemical Discrimination of Five Pleistocene Lava-Dam Outburst-

    E-Print Network [OSTI]

    Poreda, Robert J.

    . It remains in the public domain. 91 Geochemical Discrimination of Five Pleistocene Lava-Dam Outburst- Flood@usgs.gov) A B S T R A C T Pleistocene basaltic lava dams and outburst-flood deposits in the western Grand Canyon outburst-flood deposit came from a common source, a lava dam. With these data, it is possible

  15. ON THE WEAK-WIND PROBLEM IN MASSIVE STARS: X-RAY SPECTRA REVEAL A MASSIVE HOT WIND IN ? COLUMBAE

    E-Print Network [OSTI]

    Huenemoerder, David P.

    ? Columbae is a prototypical weak-wind O star for which we have obtained a high-resolution X-ray spectrum with the Chandra LETG/ACIS instrument and a low-resolution spectrum with Suzaku. This allows us, for the first time, ...

  16. MECHANICS OF WEAK LAYER SNOW UNDER CYCLIC LOADING STUDIED BY FEM Evgeny A. Podolskiy * , Guillaume Chambon, Mohamed Naaim, Johan Gaume

    E-Print Network [OSTI]

    Boyer, Edmond

    : The mechanical behavior of snow weak layers is a crucial element in dry snow slab avalanche forecasting. Here, we of reproducing the experiments; (ii) suggest that the Mohr- Coulomb failure criterion (controlled by tension strength and angle of friction) is sufficient to describe experiments; and (iii) highlight the complexity

  17. Mechanisms for Acoustic Absorption in Dry and Weakly Wet Granular Media Th. Brunet, X. Jia,* and P. Mills

    E-Print Network [OSTI]

    Paris 7 - Denis Diderot, Université

    of a linear viscoelastic loss and a nonlinear frictional one is observed in dry media. The Mindlin model the Coulomb frictional sliding be- tween cracks and grain boundary contacts and the linear mechanism dominatedMechanisms for Acoustic Absorption in Dry and Weakly Wet Granular Media Th. Brunet, X. Jia,* and P

  18. Theory of spiral wave dynamics in weakly excitable media: Asymptotic reduction to a kinematic model and applications

    E-Print Network [OSTI]

    Hakim, Vincent

    Theory of spiral wave dynamics in weakly excitable media: Asymptotic reduction to a kinematic model of an isolated broken plane wave ~wave tip! can either rotate ~steadily or unsteadily! around a large excitable core, thereby producing a spiral pattern, or retract, causing the wave to vanish at boundaries

  19. Version: 6/16/98 Keywords: wavy surface flow, finite element, longwave analysis, weakly-nonlinear analysis

    E-Print Network [OSTI]

    McCready, Mark J.

    Version: 6/16/98 Keywords: wavy surface flow, finite element, longwave analysis, weakly and drag are found, from finite element calculations, to increase as amplitude to approximately the third wavelength problem is solved numerically with a finite element formulation providing qualitative trends

  20. Strong quantum violation of the gravitational weak equivalence principle by a non-Gaussian wave-packet

    E-Print Network [OSTI]

    P. Chowdhury; D. Home; A. S. Majumdar; S. V. Mousavi; M. R. Mozaffari; S. Sinha

    2011-12-27T23:59:59.000Z

    The weak equivalence principle of gravity is examined at the quantum level in two ways. First, the position detection probabilities of particles described by a non-Gaussian wave-packet projected upwards against gravity around the classical turning point and also around the point of initial projection are calculated. These probabilities exhibit mass-dependence at both these points, thereby reflecting the quantum violation of the weak equivalence principle. Secondly, the mean arrival time of freely falling particles is calculated using the quantum probability current, which also turns out to be mass dependent. Such a mass-dependence is shown to be enhanced by increasing the non-Gaussianity parameter of the wave packet, thus signifying a stronger violation of the weak equivalence principle through a greater departure from Gaussianity of the initial wave packet. The mass-dependence of both the position detection probabilities and the mean arrival time vanish in the limit of large mass. Thus, compatibility between the weak equivalence principle and quantum mechanics is recovered in the macroscopic limit of the latter. A selection of Bohm trajectories is exhibited to illustrate these features in the free fall case.

  1. Existence and stability of superconducting solutions for the Ginzburg-Landau equations in the presence of weak electric currents

    E-Print Network [OSTI]

    Yaniv Almog; Leonid Berlyand; Dmitry Golovaty; Itai Shafrir

    2014-09-07T23:59:59.000Z

    For a reduced Ginzburg-Landau model in which the magnetic field is neglected, we prove, for weak electric currents, the existence of a steady-state solution in a vicinity of the purely superconducting state. We further show that this solution is linearly stable.

  2. Effect of gas velocity on the weakly nonlinear instability of a planar viscous sheet

    SciTech Connect (OSTI)

    Yang, Li-Jun, E-mail: yanglijun@buaa.edu.cn; Chen, Pi-Min; Wang, Chen [School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China)

    2014-07-15T23:59:59.000Z

    A weakly nonlinear spatial instability of a two-dimensional planar viscous sheet for sinuous disturbances in a co-flowing inviscid gas stream is investigated theoretically, with an emphasis on the effect of the surrounding gas velocity. The solutions of the second-order interface disturbances are derived and the wave deformation has been computed. The results indicate that the second-order surface disturbance of the fundamental sinuous mode is varicose, which causes the thinning and the subsequent breakup of the liquid sheet. The nonlinear behaviors of the planar sheet are quite sensitive to variations in gas-to-liquid velocity ratio. The deviation of the velocity ratio from the value of unity leads to a larger growth rate, a larger second-order initial amplitude, and a shorter breakup length, and therefore enhances the instability. The growth rates predicted by the present nonlinear analysis according to the shortest breakup length are generally smaller than the linear predictions and can better conform to the experimental measures of Barreras et al. [“Linear instability analysis of the viscous longitudinal perturbation on an air-blasted liquid sheets,” Atomization Sprays 11, 139 (2001)]. Furthermore, the wave deformations of the most unstable disturbances are presented. The nonlinear instability of the planar sheet for a fixed velocity difference is performed. An equal increase of the gas and liquid velocity reduces the spatial growth rate and increases the breakup length, but generally has no influences on the second-order initial amplitude and the wavelength of the disturbance.

  3. Shear and magnification angular power spectra and higher-order moments from weak gravitational lensing

    E-Print Network [OSTI]

    Andrew J. Barber; A. N. Taylor

    2003-06-06T23:59:59.000Z

    We present new results on the gravitational lensing shear and magnification power spectra obtained from numerical simulations of a flat cosmology with a cosmological constant. These results are of considerable interest since both the shear and the magnification are observables. We find that the power spectrum in the convergence behaves as expected, but the magnification develops a shot-noise spectrum due to the effects of discrete, massive clusters and symptomatic of moderate lensing beyond the weak-lensing regime. We find that this behaviour can be suppressed by "clipping" of the largest projected clusters. Our results are compared with predictions from a Halo Model-inspired functional fit for the non-linear evolution of the matter field and show excellent agreement. We also study the higher-order moments of the convergence field and find a new scaling relationship with redshift. In particular, the statistic $S_3$ is found to vary as $z_s^{-2.00\\pm 0.08}$ (where $z_s$ is the source redshift) for the cosmology studied, which makes corrections for different median redshifts in different observational surveys particularly simple to apply.

  4. Relative contributions of the weak, main and fission-recycling r-process

    E-Print Network [OSTI]

    Shibagaki, S; Mathews, G J; Chiba, S; Nishimura, S; Lorusso, G

    2015-01-01T23:59:59.000Z

    There has been a persistent conundrum in attempts to model the nucleosynthesis of heavy elements by rapid neutron capture (the $r$-process). Although the location of the abundance peaks near nuclear mass numbers 130 and 195 identify an environment of rapid neutron capture near closed nuclear shells, the abundances of elements just above and below those peaks are often underproduced by more than an order of magnitude in model calculations. At the same time there is a debate in the literature as to what degree the $r$-process elements are produced in supernovae or the mergers of binary neutron stars. In this paper we propose a novel solution to both problems. We demonstrate that the underproduction of elements above and below the $r$-process peaks characteristic in the main or weak $r$-process events (like magnetohydrodynamic jets or neutrino-driven winds in core-collapse supernovae) can be supplemented via fission fragment distributions from the recycling of material in a neutron-rich environment such as that ...

  5. Weak-triplet, color-octet scalars and the CDF dijet excess

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dobrescu, Bogdan A.; Krnjaic, Gordan Z.

    2012-04-24T23:59:59.000Z

    We extend the standard model to include a weak-triplet and color-octet scalar. This 'octo-triplet' field consists of three particles, two charged and one neutral, whose masses and renormalizable interactions depend only on two new parameters. The charged octo-triplet decay into a W boson and a gluon is suppressed by a loop factor and an accidental cancellation. Thus, the main decays of the charged octo-triplet may occur through higher-dimensional operators, mediated by a heavy vectorlike fermion, into quark pairs. For an octo-triplet mass below the tb? threshold, the decay into Wb b? through an off-shell top quark has a width comparable to that into cs? or cb?. Pair production with one octo-triplet decaying to two jets and the other decaying to a W and two soft b jets may explain the dijet-plus-W excess reported by the CDF Collaboration. The same higher-dimensional operators lead to CP violation in Bs-B?s mixing.

  6. Nonmesonic Weak Decay Dynamics from proton spectra of $\\Lambda$-Hypernuclei

    E-Print Network [OSTI]

    Krmpotic, Franjo

    2015-01-01T23:59:59.000Z

    A novel comparison between the data and the theory is proposed for the nonmesonic (NM) weak decay of hypernuclei. Instead of confronting the primary decay rates, as is usually done, we focus attention on the effective decay rates that are straightforwardly related with the number of emitted particles. Proton kinetic energy spectra of $^5_\\Lambda$He, $^7_\\Lambda$Li, $^9_\\Lambda$Be, $^{11}_\\Lambda$B, $^{12}_{\\Lambda}$C, $^{13}_\\Lambda$C, $^{15}_{\\Lambda}$N and $^{16}_{\\Lambda}$O, measured by FINUDA, are evaluated theoretically. The Independent Particle Shell Model (IPSM) is used as the nuclear structure framework, while the dynamics is described by the One-Meson-Exchange (OME) potential. Only for the $^{5}_{\\Lambda}$He, $^{7}_{\\Lambda}$Li, and $^{12}_{\\Lambda}$C hypernuclei is it possible to make a comparison with the data, since for the rest there is no published experimental information on number of produced hypernuclei. Considering solely the one-nucleon-induced ($1N$-NM) decay channel, the theory reproduces...

  7. Importance of Compton scattering for radiation spectra of isolated neutron stars with weak magnetic fields

    E-Print Network [OSTI]

    V. Suleimanov; K. Werner

    2007-02-15T23:59:59.000Z

    Emergent model spectra of neutron star atmospheres are widely used to fit the observed soft X-ray spectra of different types of isolated neutron stars. We investigate the effect of Compton scattering on the emergent spectra of hot (T_eff > 10^6 K) isolated neutron stars with weak magnetic fields. In order to compute model atmospheres in hydrostatic and radiative equilibrium we solve the radiation transfer equation with the Kompaneets operator. We calculate a set of models with effective temperatures in the range 1 - 5 * 10^6 K, with two values of surface gravity (log g = 13.9 and 14.3) and different chemical compositions. Radiation spectra computed with Compton scattering are softer than those computed without Compton scattering at high energies (E > 5 keV) for light elements (H or He) model atmospheres. The Compton effect is more significant in H model atmospheres and models with low surface gravity. The emergent spectra of the hottest (T_eff > 3 * 10^6 K) model atmospheres can be described by diluted blackbody spectra with hardness factors ~ 1.6 - 1.9. Compton scattering is less important in models with solar abundance of heavy elements.

  8. Constraints on warm dark matter from weak lensing in anomalous quadruple lenses

    E-Print Network [OSTI]

    Kaiki Taro Inoue; Ryuichi Takahashi; Tomo Takahashi; Tomoaki Ishiyama

    2015-02-12T23:59:59.000Z

    We investigate the weak lensing effect by line-of-sight structures with a surface mass density of solar mass/arcsec^2 in QSO-galaxy quadruple lens systems. Using high-resolution N-body simulations in warm dark matter (WDM) models and observed four quadruple lenses that show anomalies in the flux ratios, we obtain constraints on the mass of thermal WDM, m_WDM>= 1.3keV(95%CL) assuming that the density of the primary lens is described by a singular isothermal ellipsoid (SIE). The obtained constraint is consistent with those from Lyman-$\\alpha$ forests and the number counts of high-redshift galaxies at z>4. Our results show that WDM with a free-streaming comoving wavenumber k_{fs} <= 27 h/Mpc is disfavored as the major component of cosmological density at redshifts 0.5 <~ z <~ 4 provided that the SIE models describe the gravitational potentials of the primary lenses correctly.

  9. Hyperaccretion during tidal disruption events: Weakly bound debris envelopes and jets

    SciTech Connect (OSTI)

    Coughlin, Eric R.; Begelman, Mitchell C., E-mail: eric.coughlin@colorado.edu, E-mail: mitch@jila.colorado.edu [Also at Department of Astrophysical and Planetary Sciences, University of Colorado, UCB 391, Boulder, CO 80309, USA. (United States)

    2014-02-01T23:59:59.000Z

    After the destruction of the star during a tidal disruption event (TDE), the cataclysmic encounter between a star and the supermassive black hole (SMBH) of a galaxy, approximately half of the original stellar debris falls back onto the hole at a rate that can initially exceed the Eddington limit by orders of magnitude. We argue that the angular momentum of this matter is too low to allow it to attain a disk-like configuration with accretion proceeding at a mildly super-Eddington rate, the excess energy being carried away by a combination of radiative losses and radially distributed winds. Instead, we propose that the infalling gas traps accretion energy until it inflates into a weakly bound, quasi-spherical structure with gas extending nearly to the poles. We study the structure and evolution of such 'zero-Bernoulli accretion' flows as a model for the super-Eddington phase of TDEs. We argue that such flows cannot stop extremely super-Eddington accretion from occurring, and that once the envelope is maximally inflated, any excess accretion energy escapes through the poles in the form of powerful jets. We compare the predictions of our model to Swift J1644+57, the putative super-Eddington TDE, and show that it can qualitatively reproduce some of its observed features. Similar models, including self-gravity, could be applicable to gamma-ray bursts from collapsars and the growth of SMBH seeds inside quasi-stars.

  10. Calculating exclusion limits for Weakly Interacting Massive Particle direct detection experiments without background subtraction

    E-Print Network [OSTI]

    Anne M Green

    2001-10-04T23:59:59.000Z

    Competitive limits on the weakly interacting massive particle (WIMP) spin-independent scattering cross section are currently being produced by 76Ge detectors originally designed to search for neutrinoless double beta decay, such as the Heidelberg-Moscow and IGEX experiments. In the absence of background subtraction, limits on the WIMP interaction cross section are set by calculating the upper confidence limit on the theoretical event rate, given the observed event rate. The standard analysis technique involves calculating the 90% upper confidence limit on the number of events in each bin, and excluding any set of parameters (WIMP mass and cross-section) which produces a theoretical event rate for any bin which exceeds the 90% upper confidence limit on the event rate for that bin. We show that, if there is more than one energy bin, this produces exclusion limits that are actually at a lower degree of confidence than 90%, and are hence erroneously tight. We formulate criteria which produce true 90% confidence exclusion limits in these circumstances, including calculating the individual bin confidence limit for which the overall probability that no bins exceeds this confidence limit is 90% and calculating the 90% minimum confidence limit on the number of bins which exceed their individual bin 90% confidence limits. We then compare the limits on the WIMP cross-section produced by these criteria with those found using the standard technique, using data from the Heidelberg-Moscow and IGEX experiments.

  11. Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Liu, Jia [Department of Astronomy and Astrophysics, Columbia University, New York, NY, (United States); May, Morgan [Physics Department, Brookhaven National Laboratory, Upton, NY, (United States); Petri, Andrea [Department of Physics, Columbia University, New York, NY, (United States); Haiman, Zoltan [Department of Astronomy and Astrophysics, Columbia University, New York, NY, (United States); Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), Columbia University, New York, (United States); Hui, Lam [Department of Physics, Columbia University, New York, NY, (United States); Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), Columbia University, New York, (United States); Kratochvil, Jan M. [Astrophysics and Cosmology Research Unit, University of KwaZulu-Natal, Westville, Durban, (South Africa)

    2015-03-01T23:59:59.000Z

    Lensing peaks have been proposed as a useful statistic, containing cosmological information from non-Gaussianities that is inaccessible from traditional two-point statistics such as the power spectrum or two-point correlation functions. Here we examine constraints on cosmological parameters from weak lensing peak counts, using the publicly available data from the 154 deg2 CFHTLenS survey. We utilize a new suite of ray-tracing N-body simulations on a grid of 91 cosmological models, covering broad ranges of the three parameters ?m, ?8, and w, and replicating the galaxy sky positions, redshifts, and shape noise in the CFHTLenS observations. We then build an emulator that interpolates the power spectrum and the peak counts to an accuracy of ? 5%, and compute the likelihood in the three-dimensional parameter space (?m, ?8, w) from both observables. We find that constraints from peak counts are comparable to those from the power spectrum, and somewhat tighter when different smoothing scales are combined. Neither observable can constrain w without external data. When the power spectrum and peak counts are combined, the area of the error “banana” in the (?m, ?8) plane reduces by a factor of ? two, compared to using the power spectrum alone. For a flat ? cold dark matter model, combining both statistics, we obtain the constraint ?8(?m/0.27)0.63 = 0.85+0.03-0.03.

  12. Loss-tolerant hybrid measurement test of CHSH inequality with weakly amplified N00N states

    E-Print Network [OSTI]

    Falk Töppel; Magdalena Stobi?ska

    2015-02-18T23:59:59.000Z

    Although our understanding of Bell's theorem and experimental techniques to test it have improved over the last 40 years, thus far all Bell tests have suffered at least from the detection or the locality loophole. Most photonic Bell tests rely on inefficient discrete-outcome measurements, often provided by photon counting detection. One possible way to close the detection loophole in photonic Bell tests is to involve efficient continuous-variable measurements instead, such as homodyne detection. Here, we propose a test of the Clauser-Horne-Shimony-Holt (CHSH) inequality that applies photon counting and homodyne detection on weakly amplified two-photon N00N states. The scheme suggested is remarkably robust against experimental imperfections and suits the limits of current technology. As amplified quantum states are considered, our work also contributes to the exploration of entangled macroscopic quantum systems. Further, it may constitute an alternative platform for a loophole-free Bell test, which is also important for quantum-technological applications.

  13. Ionization distances of Rydberg atoms approaching solid surfaces in the presence of weak electric fields

    SciTech Connect (OSTI)

    Nedeljkovic, N.N.; Nedeljkovic, Lj.D. [Faculty of Physics, University of Belgrade, P.O. Box 368, Belgrade (Serbia and Montenegro)

    2005-09-15T23:59:59.000Z

    The ionization distances R{sub c}{sup I} of slow hydrogenlike Rydberg atoms approaching solid surfaces in the presence of a weak external electric field are calculated. The ionization is treated as resonant electron tunneling in the very vicinity of the top of the potential barrier, created between the ionic core and polarized solid. We obtain both the complex energies and the ionization distances by solving the energy eigenvalue problem under the outgoing wave boundary condition towards the solid. The eigenvalue problem is studied in parabolic coordinates within the framework of an etalon equation method adapted to include the confluence of turning points. It is demonstrated that in a critical region R{approx_equal}R{sub c}{sup I}>>1 a.u. of ion-surface distances R, parabolic quantum numbers n{sub 1}, n{sub 2}, and m can serve as approximate, but 'sufficiently good' quantum numbers, at least for lower n{sub 1} values. The method offers asymptotically exact analytical expressions for the ionization rates and energies, which follow the theoretical predictions of the complex scaling method (CSM). It is also found that the resulting ionization distances R{sub c}{sup I} are in very good agreement with the results of CSM. The implications of using obtained results in analyzing the recent xenon experimental data for R{sub c}{sup I} are briefly discussed.

  14. Phonons and magnetic excitation correlations in weak ferromagnetic YCrO{sub 3}

    SciTech Connect (OSTI)

    Sharma, Yogesh; Sahoo, Satyaprakash, E-mail: satya504@gmail.com, E-mail: guptaraj@iitk.ac.in, E-mail: rkatiyar@hpcf.upr.edu; Perez, William; Katiyar, Ram S., E-mail: satya504@gmail.com, E-mail: guptaraj@iitk.ac.in, E-mail: rkatiyar@hpcf.upr.edu [Department of Physics, University of Puerto Rico, Puerto Rico 00936-8377 (United States); Mukherjee, Somdutta [Department of Physics, Indian Institute of Technology, Kanpur (India); Gupta, Rajeev, E-mail: satya504@gmail.com, E-mail: guptaraj@iitk.ac.in, E-mail: rkatiyar@hpcf.upr.edu [Department of Physics, Indian Institute of Technology, Kanpur (India); Department of Materials Science Programme, Indian Institute of Technology, Kanpur (India); Garg, Ashish [Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur (India); Chatterjee, Ratnamala [Department of Physics, Indian Institute of Technology, Delhi (India)

    2014-05-14T23:59:59.000Z

    Here, we report the temperature dependent Raman spectroscopic studies on orthorhombically distorted perovskite YCrO{sub 3} over a temperature range of 20–300?K. Temperature dependence of DC-magnetization measurements under field cooled and zero field cooled protocols confirmed a Néel transition at T{sub N}???142?K. Magnetization isotherms recorded at 125?K show a clear loop opening without any magnetization saturation up to 20?kOe, indicating a coexistence of antiferromagnetic (AFM) and weak ferromagnetic (WFM) phases. Estimation of exchange constants using mean-field approximation further confirm the presence of a complex magnetic phase below T{sub N}. Temperature evolution of Raman line-shape parameters of the selected modes (associated with the octahedral rotation and A(Y)-shift in the unit-cell) reveal an anomalous phonon shift near T{sub N}. An additional phonon anomaly was identified at T{sup *}???60?K, which could possibly be attributed to the change in the spin dynamics. Moreover, the positive and negative shifts in Raman frequencies between T{sub N} and T{sup *} suggest competing WFM and AFM interactions. A close match between the phonon frequency of B{sub 3g} (3)-octahedral rotation mode with the square of sublattice magnetization between T{sub N} and T{sup *} is indicative of the presence of spin-phonon coupling in multiferroic YCrO{sub 3}.

  15. Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Liu, Jia; May, Morgan; Petri, Andrea; Haiman, Zoltan; Hui, Lam; Kratochvil, Jan M.

    2015-03-01T23:59:59.000Z

    Lensing peaks have been proposed as a useful statistic, containing cosmological information from non-Gaussianities that is inaccessible from traditional two-point statistics such as the power spectrum or two-point correlation functions. Here we examine constraints on cosmological parameters from weak lensing peak counts, using the publicly available data from the 154 deg2 CFHTLenS survey. We utilize a new suite of ray-tracing N-body simulations on a grid of 91 cosmological models, covering broad ranges of the three parameters ?m, ?8, and w, and replicating the galaxy sky positions, redshifts, and shape noise in the CFHTLenS observations. We then build an emulator thatmore »interpolates the power spectrum and the peak counts to an accuracy of ? 5%, and compute the likelihood in the three-dimensional parameter space (?m, ?8, w) from both observables. We find that constraints from peak counts are comparable to those from the power spectrum, and somewhat tighter when different smoothing scales are combined. Neither observable can constrain w without external data. When the power spectrum and peak counts are combined, the area of the error “banana” in the (?m, ?8) plane reduces by a factor of ? two, compared to using the power spectrum alone. For a flat ? cold dark matter model, combining both statistics, we obtain the constraint ?8(?m/0.27)0.63 = 0.85+0.03-0.03.« less

  16. Systematic Errors in Future Weak Lensing Surveys: Requirements and Prospects for Self-Calibration

    E-Print Network [OSTI]

    Dragan Huterer; Masahiro Takada; Gary Bernstein; Bhuvnesh Jain

    2005-06-02T23:59:59.000Z

    We study the impact of systematic errors on planned weak lensing surveys and compute the requirements on their contributions so that they are not a dominant source of the cosmological parameter error budget. The generic types of error we consider are multiplicative and additive errors in measurements of shear, as well as photometric redshift errors. In general, more powerful surveys have stronger systematic requirements. For example, for a SNAP-type survey the multiplicative error in shear needs to be smaller than 1%(fsky/0.025)^{-1/2} of the mean shear in any given redshift bin, while the centroids of photometric redshift bins need to be known to better than 0.003(fsky/0.025)^{-1/2}. With about a factor of two degradation in cosmological parameter errors, future surveys can enter a self-calibration regime, where the mean systematic biases are self-consistently determined from the survey and only higher-order moments of the systematics contribute. Interestingly, once the power spectrum measurements are combined with the bispectrum, the self-calibration regime in the variation of the equation of state of dark energy w_a is attained with only a 20-30% error degradation.

  17. Polynomial-time algorithm for simulation of weakly interacting quantum spin systems

    E-Print Network [OSTI]

    Sergey Bravyi; David DiVincenzo; Daniel Loss

    2007-07-12T23:59:59.000Z

    We describe an algorithm that computes the ground state energy and correlation functions for 2-local Hamiltonians in which interactions between qubits are weak compared to single-qubit terms. The running time of the algorithm is polynomial in the number of qubits and the required precision. Specifically, we consider Hamiltonians of the form $H=H_0+\\epsilon V$, where H_0 describes non-interacting qubits, V is a perturbation that involves arbitrary two-qubit interactions on a graph of bounded degree, and $\\epsilon$ is a small parameter. The algorithm works if $|\\epsilon|$ is below a certain threshold value that depends only upon the spectral gap of H_0, the maximal degree of the graph, and the maximal norm of the two-qubit interactions. The main technical ingredient of the algorithm is a generalized Kirkwood-Thomas ansatz for the ground state. The parameters of the ansatz are computed using perturbative expansions in powers of $\\epsilon$. Our algorithm is closely related to the coupled cluster method used in quantum chemistry.

  18. Large-scale weakly nonlinear perturbations of convective magnetic dynamos in a rotating layer

    E-Print Network [OSTI]

    Roman Chertovskih; Vladislav Zheligovsky

    2015-04-26T23:59:59.000Z

    We present a new mechanism for generation of large-scale magnetic field by thermal convection which does not involve the alpha-effect. We consider weakly nonlinear perturbations of space-periodic steady convective magnetic dynamos in a rotating layer that were identified in our previous work. The perturbations have a spatial scale in the horizontal direction that is much larger than the period of the perturbed convective magnetohydrodynamic state. Following the formalism of the multiscale stability theory, we have derived the system of amplitude equations governing the evolution of the leading terms in expansion of the perturbations in power series in the scale ratio. This asymptotic analysis is more involved than in the cases considered earlier, because the kernel of the operator of linearisation has zero-mean neutral modes whose origin lies in the spatial invariance of the perturbed regime, the operator reduced on the generalised kernel has two Jordan normal form blocks of size two, and simplifying symmetries of the perturbed state are now missing. Numerical results for the amplitude equations show that a perturbation, periodic in slow horizontal variable, either decays in time, or blows up at a finite time with amplitudes turning into a periodically-replicated delta-function moving at a constant speed.

  19. Winding out of the Swamp: Evading the Weak Gravity Conjecture with F-term Winding Inflation?

    E-Print Network [OSTI]

    Hebecker, Arthur; Rompineve, Fabrizio; Witkowski, Lukas T

    2015-01-01T23:59:59.000Z

    We present a new model of large field inflation along a winding trajectory in the field space of two axionic fields, where the 'axions' originate from the complex structure moduli sector of a Calabi-Yau 3-fold at large complex structure. The winding trajectory arises from fixing one combination of axions by bulk fluxes and allows for a transplanckian effective field range. The inflaton potential arises from small 'instantonic' corrections to the geometry and realises natural inflation. By working in a regime of large complex structure for two complex structure moduli the inflaton potential can be made subdominant without severe tuning. We also discuss the impact of the recent 'no-go theorems' for transplanckian axion periodicities on our work. Interestingly, our setup seems to realise a loophole pointed out in arXiv:1503.04783: our construction is a candidate for a string theory model of large field inflation which is consistent with the mild form of the weak gravity conjecture for axions.

  20. Weak-triplet, color-octet scalars and the CDF dijet excess

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dobrescu, Bogdan A.; Krnjaic, Gordan Z.

    2012-04-24T23:59:59.000Z

    We extend the standard model to include a weak-triplet and color-octet scalar. This 'octo-triplet' field consists of three particles, two charged and one neutral, whose masses and renormalizable interactions depend only on two new parameters. The charged octo-triplet decay into a W boson and a gluon is suppressed by a loop factor and an accidental cancellation. Thus, the main decays of the charged octo-triplet may occur through higher-dimensional operators, mediated by a heavy vectorlike fermion, into quark pairs. For an octo-triplet mass below the tb? threshold, the decay into Wb b? through an off-shell top quark has a width comparablemore »to that into cs? or cb?. Pair production with one octo-triplet decaying to two jets and the other decaying to a W and two soft b jets may explain the dijet-plus-W excess reported by the CDF Collaboration. The same higher-dimensional operators lead to CP violation in Bs-B?s mixing.« less

  1. A dimension-breaking phenomenon for water waves with weak surface tension

    E-Print Network [OSTI]

    Mark D. Groves; Shu-Ming Sun; Erik Wahlén

    2014-11-10T23:59:59.000Z

    It is well known that the water-wave problem with weak surface tension has small-amplitude line solitary-wave solutions which to leading order are described by the nonlinear Schr\\"odinger equation. The present paper contains an existence theory for three-dimensional periodically modulated solitary-wave solutions which have a solitary-wave profile in the direction of propagation and are periodic in the transverse direction; they emanate from the line solitary waves in a dimension-breaking bifurcation. In addition, it is shown that the line solitary waves are linearly unstable to long-wavelength transverse perturbations. The key to these results is a formulation of the water wave problem as an evolutionary system in which the transverse horizontal variable plays the role of time, a careful study of the purely imaginary spectrum of the operator obtained by linearising the evolutionary system at a line solitary wave, and an application of an infinite-dimensional version of the classical Lyapunov centre theorem.

  2. Weak chaos and the 'melting transition' in a confined microplasma system

    SciTech Connect (OSTI)

    Antonopoulos, Chris; Basios, Vasileios [Interdisciplinary Center for Nonlinear Phenomena and Complex Systems (CeNoLi), Service de Physique des Systemes Complexes et Mecanique Statistique, Universite Libre de Bruxelles, 1050 Brussels (Belgium); Bountis, Tassos [Center for Research and Applications of Nonlinear Systems (CRANS), Department of Mathematics, University of Patras, 26500 Patras (Greece)

    2010-01-15T23:59:59.000Z

    We present results demonstrating the occurrence of changes in the collective dynamics of a Hamiltonian system which describes a confined microplasma characterized by long-range Coulomb interactions. In its lower energy regime, we first detect macroscopically the transition from a 'crystallinelike' to a 'liquidlike' behavior, which we call the 'melting transition'. We then proceed to study this transition using a microscopic chaos indicator called the smaller alignment index (SALI), which utilizes two deviation vectors in the tangent dynamics of the flow and is nearly constant for ordered (quasiperiodic) orbits, while it decays exponentially to zero for chaotic orbits as exp[-(lambda{sub 1}-lambda{sub 2})t], where lambda{sub 1}>lambda{sub 2}>0 are the two largest Lyapunov exponents. During the melting phase, SALI exhibits a peculiar stairlike decay to zero, reminiscent of 'sticky' orbits of Hamiltonian systems near the boundaries of resonance islands. This alerts us to the importance of the DELTAlambda=lambda{sub 1}-lambda{sub 2} variations in that regime and helps us identify the energy range over which 'melting' occurs as a multistage diffusion process through weakly chaotic layers in the phase space of the microplasma. Additional evidence supporting further the above findings is given by examining the GALI{sub k} indices, which generalize SALI (=GALI{sub 2}) to the case of k>2 deviation vectors and depend on the complete spectrum of Lyapunov exponents of the tangent flow about the reference orbit.

  3. Cross-correlation of Planck CMB Lensing and CFHTLenS Galaxy Weak Lensing Maps

    E-Print Network [OSTI]

    Liu, Jia

    2015-01-01T23:59:59.000Z

    We cross-correlate cosmic microwave background (CMB) lensing and galaxy weak lensing maps using the Planck 2013 and 2015 data and the 154 deg^2 Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS). This measurement probes large-scale structure at intermediate redshifts ~0.9, between the high- and low-redshift peaks of the CMB and CFHTLenS lensing kernels, respectively. Using the noise properties of these data sets and standard Planck 2015 LCDM cosmological parameters, we forecast a signal-to-noise ratio ~4.6 for the cross-correlation. We find that the noise level of our actual measurement agrees well with this estimate, but the amplitude of the signal lies well below the theoretical prediction. The best-fit amplitudes of our measured cross-correlations are $A_{2013}=0.48\\pm0.26$ and $A_{2015}=0.44\\pm0.22$ using the 2013 and 2015 Planck CMB lensing maps, respectively, where $A=1$ corresponds to the fiducial Planck 2015 LCDM prediction. Due to the low measured amplitude, the detection significance is modera...

  4. The impact of spurious shear on cosmological parameter estimates from weak lensing observables

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Petri, Andrea [Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States); May, Morgan [Brookhaven National Laboratory (BNL), Upton, NY (United States); Haiman, Zoltan [Columbia Univ., New York, NY (United States); Kratochvil, Jan M. [Univ. of KwaZulu-Natal, Durban (South Africa)

    2014-12-01T23:59:59.000Z

    Residual errors in shear measurements, after corrections for instrument systematics and atmospheric effects, can impact cosmological parameters derived from weak lensing observations. Here we combine convergence maps from our suite of ray-tracing simulations with random realizations of spurious shear. This allows us to quantify the errors and biases of the triplet (?m,w,?8) derived from the power spectrum (PS), as well as from three different sets of non-Gaussian statistics of the lensing convergence field: Minkowski functionals (MFs), low-order moments (LMs), and peak counts (PKs). Our main results are as follows: (i) We find an order of magnitude smaller biases from the PS than in previous work. (ii) The PS and LM yield biases much smaller than the morphological statistics (MF, PK). (iii) For strictly Gaussian spurious shear with integrated amplitude as low as its current estimate of ?sys2?10-7, biases from the PS and LM would be unimportant even for a survey with the statistical power of Large Synoptic Survey Telescope. However, we find that for surveys larger than ?100 deg2, non-Gaussianity in the noise (not included in our analysis) will likely be important and must be quantified to assess the biases. (iv) The morphological statistics (MF, PK) introduce important biases even for Gaussian noise, which must be corrected in large surveys. The biases are in different directions in (?m,w,?8) parameter space, allowing self-calibration by combining multiple statistics. Our results warrant follow-up studies with more extensive lensing simulations and more accurate spurious shear estimates.

  5. EFFECT OF AMBIPOLAR DIFFUSION ON THE NONLINEAR EVOLUTION OF MAGNETOROTATIONAL INSTABILITY IN WEAKLY IONIZED DISKS

    SciTech Connect (OSTI)

    Bai Xuening; Stone, James M., E-mail: xbai@astro.princeton.edu, E-mail: jstone@astro.princeton.edu [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

    2011-08-01T23:59:59.000Z

    We study the role of ambipolar diffusion (AD) on the nonlinear evolution of the magnetorotational instability (MRI) in protoplanetary disks using the strong coupling limit, which applies in very weakly ionized gas with electron recombination time much shorter than the orbital time so that a single-fluid treatment is sufficient. The effect of AD in this limit is characterized by the dimensionless number Am, the frequency at which neutral particles collides with ions normalized to the orbital frequency. We perform three-dimensional unstratified shearing-box simulations of the MRI over a wide range of Am as well as different magnetic field strengths and geometries. The saturation level of the MRI turbulence depends on the magnetic geometry and increases with the net magnetic flux. There is an upper limit to the net flux for sustained turbulence, corresponding to the requirement that the most unstable vertical wavelength be less than the disk scale height. Correspondingly, at a given Am, there exists a maximum value of the turbulent stress {alpha}{sub max}. For Am {approx}< 1, the largest stress is associated with a field geometry that has both net vertical and toroidal flux. In this case, we confirm the results of linear analyses that show the fastest growing mode has a non-zero radial wavenumber with a growth rate exceeding that of the pure vertical field case. We find there is a very tight correlation between the turbulent stress {alpha} and the plasma ({beta}) {identical_to} P{sub gas}/P{sub mag} {approx} 1/2{alpha} at the saturated state of the MRI turbulence regardless of field geometry, and {alpha}{sub max} rapidly decreases with decreasing Am. In particular, we find {alpha}{sub max} {approx} 7 x 10{sup -3} for Am = 1 and {alpha}{sub max} {approx} 6 x 10{sup -4} for Am = 0.1.

  6. Soot formation in weakly buoyant acetylene-fueled laminar jet diffusion flames burning in air

    SciTech Connect (OSTI)

    Sunderland, P.B.; Koeylue, U.O.; Faeth, G.M. (Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering)

    1995-01-01T23:59:59.000Z

    The structure and soot properties of weakly buoyant, acetylene-fueled, laminar jet diffusion flames were studied experimentally for combustion in air at pressures of 0.125--0.250 atm. The following measurements were made: soot volume fractions using laser extinction, temperatures using both thermocouples and multiline emission, soot structure using thermophoretic sampling and analysis by transmission electron microscopy, concentrations of major gas species using sampling and analysis by gas chromatography, and velocities using laser velocimetry. As distance increased along the axis of the present acetylene-fueled flames, significant soot formation began when temperatures exceeded roughly 1250 K, and ended when fuel-equivalence ratios decreased to roughly 1.7, where the concentration of acetylene became small. This behavior allowed observations of soot growth and nucleation for acetylene concentrations of 6 [times] 10[sup [minus]6]--1 [times] 10[sup [minus]3] and temperatures of 1,000--2,100 K. Over this range of conditions, soot growth rates were comparable to past observations of new soot in premixed flames, and after correction for effects of soot oxidation yielded essentially first-order growth with respect to acetylene concentrations with a negligible activation energy, and an acetylene/soot collision efficiency of 0.53%. Present measurements of soot nucleation rates also suggested first-order behavior with respect to acetylene concentrations but with an activation energy of 32 kcal/gmol and with rates that were significantly lower than earlier estimates in the literature. Nevertheless, uncertainties about the effects of soot oxidation and age on soot growth, and about effects of surface area estimates and translucent objects on soot nucleation, must be resolved in order to adequately define soot formation processes in diffusion flames.

  7. Future asymptotics and geodesic completeness of polarized T2-symmetric spacetimes with weak regularity

    E-Print Network [OSTI]

    Philippe G. LeFloch; Jacques Smulevici

    2014-08-09T23:59:59.000Z

    We investigate the late-time asymptotics of future expanding, polarized vacuum Einstein spacetimes with T2-symmetry on T3, which, by definition, admit two spacelike Killing fields. Our main result is the existence of a stable asymptotic regime within this class, that is, we provide here a full description of the late-time asymptotics of the solutions to the Einstein equations when the initial data set is close to the asymptotic regime. Our proof is based on several energy functionals with lower order corrections (as is standard for such problems) and the derivation of a simplified model which we exhibit here. Roughly speaking, the Einstein equations in the symmetry class under consideration consists of a system of wave equations coupled to constraint equations plus a system of ordinary differential equations. The unknowns involved in the system of ordinary equations are blowing up in the future timelike directions. One of our main contributions is the derivation of novel effective equations for suitably renormalized unknowns. Interestingly, this renormalization is not performed with respect to a fixed background, but does involve the energy of the coupled system of wave equations. In addition, we construct an open set of initial data which are arbitrarily close to the expected asymptotic behavior. We emphasize that, in comparison, the class of Gowdy spacetimes exhibits a very different dynamical behavior to the one we uncover in the present work for general polarized T2-symmetric spacetimes. Furthermore, all the conclusions of this paper are valid within the framework of weakly T2-symmetric spacetimes previously introduced by the authors.

  8. The impact of spurious shear on cosmological parameter estimates from weak lensing observables

    SciTech Connect (OSTI)

    Petri, Andrea [Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States); May, Morgan [Brookhaven National Laboratory (BNL), Upton, NY (United States); Haiman, Zoltan [Columbia Univ., New York, NY (United States); Kratochvil, Jan M. [Univ. of KwaZulu-Natal, Durban (South Africa)

    2014-12-01T23:59:59.000Z

    Residual errors in shear measurements, after corrections for instrument systematics and atmospheric effects, can impact cosmological parameters derived from weak lensing observations. Here we combine convergence maps from our suite of ray-tracing simulations with random realizations of spurious shear. This allows us to quantify the errors and biases of the triplet (?m,w,?8) derived from the power spectrum (PS), as well as from three different sets of non-Gaussian statistics of the lensing convergence field: Minkowski functionals (MFs), low-order moments (LMs), and peak counts (PKs). Our main results are as follows: (i) We find an order of magnitude smaller biases from the PS than in previous work. (ii) The PS and LM yield biases much smaller than the morphological statistics (MF, PK). (iii) For strictly Gaussian spurious shear with integrated amplitude as low as its current estimate of ?sys2?10-7, biases from the PS and LM would be unimportant even for a survey with the statistical power of Large Synoptic Survey Telescope. However, we find that for surveys larger than ?100 deg2, non-Gaussianity in the noise (not included in our analysis) will likely be important and must be quantified to assess the biases. (iv) The morphological statistics (MF, PK) introduce important biases even for Gaussian noise, which must be corrected in large surveys. The biases are in different directions in (?m,w,?8) parameter space, allowing self-calibration by combining multiple statistics. Our results warrant follow-up studies with more extensive lensing simulations and more accurate spurious shear estimates.

  9. Testing a phenomenologically extended DGP model with upcoming weak lensing surveys

    SciTech Connect (OSTI)

    Camera, Stefano; Diaferio, Antonaldo [Dipartimento di Fisica Generale ''A. Avogadro'', Università di Torino, via P. Giuria 1, 10125 Torino (Italy); Cardone, Vincenzo F., E-mail: camera@ph.unito.it, E-mail: diaferio@ph.unito.it, E-mail: winnyenodrac@gmail.com [Dipartimento di Scienze e Tecnologie per l'Ambiente e il Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (Italy)

    2011-01-01T23:59:59.000Z

    A phenomenological extension of the well-known brane-world cosmology of Dvali, Gabadadze and Porrati (eDGP) has recently been proposed. In this model, a cosmological-constant-like term is explicitly present as a non-vanishing tension ? on the brane, and an extra parameter ? tunes the cross-over scale r{sub c}, the scale at which higher dimensional gravity effects become non negligible. Since the Hubble parameter in this cosmology reproduces the same ?CDM expansion history, we study how upcoming weak lensing surveys, such as Euclid and DES (Dark Energy Survey), can confirm or rule out this class of models. We perform Monte Carlo Markov Chain simulations to determine the parameters of the model, using Type Ia Supernovæ, H(z) data, Gamma Ray Bursts and Baryon Acoustic Oscillations. We also fit the power spectrum of the temperature anisotropies of the Cosmic Microwave Background to obtain the correct normalisation for the density perturbation power spectrum. Then, we compute the matter and the cosmic shear power spectra, both in the linear and non-linear régimes. The latter is calculated with the two different approaches of Hu and Sawicki (2007) (HS) and Khoury and Wyman (2009) (KW). With the eDGP parameters coming from the Markov Chains, KW reproduces the ?CDM matter power spectrum at both linear and non-linear scales and the ?CDM and eDGP shear signals are degenerate. This result does not hold with the HS prescription. Indeed, Euclid can distinguish the eDGP model from ?CDM because their expected power spectra roughly differ by the 3? uncertainty in the angular scale range 700?

  10. The impact of spurious shear on cosmological parameter estimates from weak lensing observables

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Petri, Andrea; May, Morgan; Haiman, Zoltan; Kratochvil, Jan M.

    2014-12-01T23:59:59.000Z

    Residual errors in shear measurements, after corrections for instrument systematics and atmospheric effects, can impact cosmological parameters derived from weak lensing observations. Here we combine convergence maps from our suite of ray-tracing simulations with random realizations of spurious shear. This allows us to quantify the errors and biases of the triplet (?m,w,?8) derived from the power spectrum (PS), as well as from three different sets of non-Gaussian statistics of the lensing convergence field: Minkowski functionals (MFs), low-order moments (LMs), and peak counts (PKs). Our main results are as follows: (i) We find an order of magnitude smaller biases from themore »PS than in previous work. (ii) The PS and LM yield biases much smaller than the morphological statistics (MF, PK). (iii) For strictly Gaussian spurious shear with integrated amplitude as low as its current estimate of ?sys2?10-7, biases from the PS and LM would be unimportant even for a survey with the statistical power of Large Synoptic Survey Telescope. However, we find that for surveys larger than ?100 deg2, non-Gaussianity in the noise (not included in our analysis) will likely be important and must be quantified to assess the biases. (iv) The morphological statistics (MF, PK) introduce important biases even for Gaussian noise, which must be corrected in large surveys. The biases are in different directions in (?m,w,?8) parameter space, allowing self-calibration by combining multiple statistics. Our results warrant follow-up studies with more extensive lensing simulations and more accurate spurious shear estimates.« less

  11. Atmospheric PSF Interpolation for Weak Lensing in Short Exposure Imaging Data

    SciTech Connect (OSTI)

    Chang, C.; Marshall, P.J.; Jernigan, J.G.; Peterson, J.R.; Kahn, S.M.; Gull, S.F.; AlSayyad, Y.; Ahmad, Z.; Bankert, J.; Bard, D.; Connolly, A.; Gibson, R.R.; Gilmore, K.; Grace, E.; Hannel, M.; Hodge, M.A.; Jones, L.; Krughoff, S.; Lorenz, S.; Marshall, S.; Meert, A.

    2012-09-19T23:59:59.000Z

    A main science goal for the Large Synoptic Survey Telescope (LSST) is to measure the cosmic shear signal from weak lensing to extreme accuracy. One difficulty, however, is that with the short exposure time ({approx_equal}15 seconds) proposed, the spatial variation of the Point Spread Function (PSF) shapes may be dominated by the atmosphere, in addition to optics errors. While optics errors mainly cause the PSF to vary on angular scales similar or larger than a single CCD sensor, the atmosphere generates stochastic structures on a wide range of angular scales. It thus becomes a challenge to infer the multi-scale, complex atmospheric PSF patterns by interpolating the sparsely sampled stars in the field. In this paper we present a new method, psfent, for interpolating the PSF shape parameters, based on reconstructing underlying shape parameter maps with a multi-scale maximum entropy algorithm. We demonstrate, using images from the LSST Photon Simulator, the performance of our approach relative to a 5th-order polynomial fit (representing the current standard) and a simple boxcar smoothing technique. Quantitatively, psfent predicts more accurate PSF models in all scenarios and the residual PSF errors are spatially less correlated. This improvement in PSF interpolation leads to a factor of 3.5 lower systematic errors in the shear power spectrum on scales smaller than {approx} 13, compared to polynomial fitting. We estimate that with psfent and for stellar densities greater than {approx_equal}1/arcmin{sup 2}, the spurious shear correlation from PSF interpolation, after combining a complete 10-year dataset from LSST, is lower than the corresponding statistical uncertainties on the cosmic shear power spectrum, even under a conservative scenario.

  12. Nonunique Stationary States in Driven Systems; The Weakly Ionized Plasma E. Carlen 1 , R. Esposito 2 , J.L. Lebowitz 3 , R. Marra 4 and A. Rokhlenko 3

    E-Print Network [OSTI]

    dynamic simulations of Hamiltonian systems of particles (Ÿ 10 6 ) interacting via simple pair potentials distribution f(v; t) in a weakly ionized spatially homogeneous plasma in an external electric field E. f recognizable, model of a weakly ionized plasma in the presence of an external electric field. A more realistic

  13. Thermal Distributions, Saha Equation, Weak Interactions This chapter deals with some background issues important to modeling the BBN as well as

    E-Print Network [OSTI]

    Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

    Chapter 3 Thermal Distributions, Saha Equation, Weak Interactions This chapter deals with some · the Saha equation · low-energy weak interactions 3.1 Thermal distributions The thermal distributions to be considered: the Saha equation discussion will il- lustrate this.) The parameter µ, the chemical potential

  14. Collisions induced by halo and weakly bound nuclei around the Coulomb barrier: Results at INFN-LNS Catania

    SciTech Connect (OSTI)

    Figuera, Pierpaolo [INFN Laboratorio Nazionale del Sud, Via S.Sofia 62, I95123 Catania (Italy)

    2012-10-20T23:59:59.000Z

    The study of collisions around the Coulomb barrier induced by halo and/or weakly bound nuclei has been the object of many publications in the last years, since the peculiar structure of such nuclei can strongly affect the reaction dynamics. In this paper we will summarize some results on the above topic obtained by our group at INFN-LNS Catania. Results concerning the study of elastic scattering and different reaction mechanisms in collisions induced by the halo nuclei {sup 11}Be and {sup 6}He and by the weakly bound stable nuclei {sup 6,7}Li on a {sup 64}Zn target, at energies around the Coulomb barrier, will be presented. The conclusions of our studies will be compared with the ones of other authors, in order to show if clear systematic conclusions can be drawn from the different papers published in the literature so far.

  15. On the transfer of energy towards infinity in the theory of weak turbulence for the nonlinear Schrödinger equation

    E-Print Network [OSTI]

    A. H. M. Kierkels; J. J. L. Velázquez

    2014-10-08T23:59:59.000Z

    We study the mathematical properties of a kinetic equation which describes the long time behaviour of solutions to the weak turbulence equation associated to the cubic nonlinear Schr\\"odinger equation. In particular, we give a precise definition of weak solutions and prove global existence of solutions for all initial data with finite mass. We also prove that any nontrivial initial datum yields the instantaneous onset of a condensate, i.e. a Dirac mass at the origin for any positive time. Furthermore we show that the only stationary solutions with finite total measure are Dirac masses at the origin. We finally construct solutions with finite energy, which is transferred to infinity in a self-similar manner.

  16. Verification, optimization and refinement of a direct-inverse transonic wing design method including weak viscous interaction

    E-Print Network [OSTI]

    Ratcliff, Robert R.

    1989-01-01T23:59:59.000Z

    as weak or nonexistent shock waves, a slowly increasing adverse pressure gradient to limit boundary layer separation, a center of pressure loca, tion giving a desirable pitch- ing moment, or an efficient spanwise loa. ding. The designer may also use wind...-tunnel tests of successful airfoils as an aid in picking a desirable pressure distribution. The direct-inverse technique has been successfully used in stretched and sheared Carte- sian coordinate systems' ' '' and most recently by Gaily ' in a curvilinear...

  17. Electric and Weak Electric Dipole Form Factors for Heavy Fermions in a General Two Higgs Doublet Model

    E-Print Network [OSTI]

    Daniel Gomez-Dumm; G. A. Gonzalez-Sprinberg

    1999-05-03T23:59:59.000Z

    The electric and weak electric dipole form factors for heavy fermions are calculated in the context of the most general two-Higgs-doublet model (2HDM). We find that the large top mass can produce a significant enhancement of the electric dipole form factor in the case of the b and c quarks. This effect can be used to distinguish between different 2HDM scenarios.

  18. Intercept-resend attacks in the Bennett-Brassard 1984 quantum key distribution protocol with weak coherent pulses

    E-Print Network [OSTI]

    Marcos Curty; Norbert Lütkenhaus

    2005-02-20T23:59:59.000Z

    Unconditional security proofs of the Bennett-Brassard protocol of quantum key distribution have been obtained recently. These proofs cover also practical implementations that utilize weak coherent pulses in the four signal polarizations. Proven secure rates leave open the possibility that new proofs or new public discussion protocols obtain larger rates over increased distance. In this paper we investigate limits to error rate and signal losses that can be tolerated by future protocols and proofs.

  19. Constraining primordial non-Gaussianity with cosmological weak lensing: shear and flexion

    SciTech Connect (OSTI)

    Fedeli, C. [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055 (United States); Bartelmann, M. [Zentrum für Astronomie, Universität Heidelberg, Albert-Überle-Straße 2, 69120 Heidelberg (Germany); Moscardini, L., E-mail: cosimo.fedeli@astro.ufl.edu, E-mail: bartelmann@uni-heidelberg.de, E-mail: lauro.moscardini@unibo.it [Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, 40127 Bologna (Italy)

    2012-10-01T23:59:59.000Z

    We examine the cosmological constraining power of future large-scale weak lensing surveys on the model of the ESA planned mission Euclid, with particular reference to primordial non-Gaussianity. Our analysis considers several different estimators of the projected matter power spectrum, based on both shear and flexion. We review the covariance and Fisher matrix for cosmic shear and evaluate those for cosmic flexion and for the cross-correlation between the two. The bounds provided by cosmic shear alone are looser than previously estimated, mainly due to the reduced sky coverage and background number density of sources for the latest Euclid specifications. New constraints for the local bispectrum shape, marginalized over ?{sub 8}, are at the level of ?f{sub NL} ? 100, with the precise value depending on the exact multipole range that is considered in the analysis. We consider three additional bispectrum shapes, for which the cosmic shear constraints range from ?f{sub NL} ? 340 (equilateral shape) up to ?f{sub NL} ? 500 (orthogonal shape). Also, constraints on the level of non-Gaussianity and on the amplitude of the matter power spectrum ?{sub 8} are almost perfectly anti-correlated, except for the orthogonal bispectrum shape for which they are correlated. The competitiveness of cosmic flexion constraints against cosmic shear ones depends by and large on the galaxy intrinsic flexion noise, that is still virtually unconstrained. Adopting the very high value that has been occasionally used in the literature results in the flexion contribution being basically negligible with respect to the shear one, and for realistic configurations the former does not improve significantly the constraining power of the latter. Since the shear shot noise is white, while the flexion one decreases with decreasing scale, by considering high enough multipoles the two contributions have to become comparable. Extending the analysis up to l{sub max} = 20,000 cosmic flexion, while being still subdominant, improves the shear constraints by ? 10% when added. However on such small scales the highly non-linear clustering of matter, the impact of baryonic physics, and the non-Gaussian part of the covariance matrix make any error estimation uncertain. By considering lower, and possibly more realistic, values of the flexion intrinsic shape noise results in flexion constraining power being a factor of ? 2 better than that of shear, and the bounds on ?{sub 8} and f{sub NL} being improved by a factor of ? 3 upon their combination.

  20. The production of Tsallis entropy in the limit of weak chaos and a new indicator of chaoticity

    E-Print Network [OSTI]

    G. Lukes-Gerakopoulos; N. Voglis; C. Efthymiopoulos

    2008-01-09T23:59:59.000Z

    We study the connection between the appearance of a `metastable' behavior of weakly chaotic orbits, characterized by a constant rate of increase of the Tsallis q-entropy (Tsallis 1988), and the solutions of the variational equations of motion for the same orbits. We demonstrate that the variational equations yield transient solutions, lasting for long time intervals, during which the length of deviation vectors of nearby orbits grows in time almost as a power-law. The associated power exponent can be simply related to the entropic exponent for which the q-entropy exhibits a constant rate of increase. This analysis leads to the definition of a new sensitive indicator distinguishing regular from weakly chaotic orbits, that we call `Average Power Law Exponent' (APLE). We compare the APLE with other established indicators of the literature. In particular, we give examples of application of the APLE in a) a thin separatrix layer of the standard map, b) the stickiness region around an island of stability in the same map, and c) the web of resonances of a 4D symplectic map. In all these cases we identify weakly chaotic orbits exhibiting the `metastable' behavior associated with the Tsallis q-entropy.