2,586 research outputs found

    The Onset of Nuclear Structure Effects in Near-Barrier Elastic Scattering of Weakly-Bound Nuclei: 6^6He and 6^6Li Compared

    Full text link
    The elastic scattering of the halo nucleus 6^6He from heavy targets at incident energies near the Coulomb barrier displays a marked deviation from the standard Fresnel-type diffraction behavior. This deviation is due to the strong Coulomb dipole breakup coupling produced by the Coulomb field of the heavy target, a specific feature of the nuclear structure of 6^6He. We have performed Continuum Discretized Coupled Channels calculations for the elastic scattering of 6^{6}He and 6^6Li from 58^{58}Ni, 120^{120}Sn, 144^{144}Sm, 181^{181}Ta and 208^{208}Pb targets in order to determine the range of ZTZ_{\mathrm T} where this nuclear-structure specific coupling effect becomes manifest. We find that the strong Coulomb dipole breakup coupling effect is only clearly experimentally distinguishable for targets of ZT≈80Z_{\mathrm T} \approx 80.Comment: 10 pages with 3 figure

    Climate Ready Estuaries - COAST in Action: 2012 Projects from Maine and New Hampshire

    Get PDF
    In summer 2011 the US EPA’s Climate Ready Estuaries program awarded funds to the Casco Bay Estuary Partnership (CBEP) in Portland, Maine, and the Piscataqua Region Estuaries Partnership (PREP) in coastal New Hampshire, to further develop and use COAST (COastal Adaptation to Sea level rise Tool) in their sea level rise adaptation planning processes. The New England Environmental Finance Center worked with municipal staff, elected officials, and other stakeholders to select specific locations, vulnerable assets, and adaptation actions to model using COAST. The EFC then collected the appropriate base data layers, ran the COAST simulations, and provided visual, numeric, and presentation-based products in support of the planning processes underway in both locations. These products helped galvanize support for the adaptation planning efforts. Through facilitated meetings they also led to stakeholders identifying specific action steps and begin to determine how to implement them

    Cluster Model for Near-barrier Fusion Induced by Weakly Bound and Halo Nuclei

    Get PDF
    The influence on the fusion process of coupling transfer/breakup channels is investigated for the medium weight 6,7^{6,7}Li+59^{59}Co systems in the vicinity of the Coulomb barrier. Coupling effects are discussed within a comparison of predictions of the Continuum Discretized Coupled-Channels model. Applications to 6^{6}He+59^{59}Co induced by the borromean halo nucleus 6^{6}He are also proposed.Comment: 5 pages, 3 figures, FINUSTAR2 Conference, Aghios Nikolaus, Crete, Greece. 10-14 September 200

    Payout Policy in the 21st Century

    Get PDF
    We survey 384 CFOs and Treasurers, and conduct in-depth interviews with an additional two dozen, to determine the key factors that drive dividend and share repurchase policies. We find that managers are very reluctant to cut dividends, that dividends are smoothed through time, and that dividend increases are tied to long-run sustainable earnings but much less so than in the past. Rather than increasing dividends, many firms now use repurchases as an alternative. Paying out with repurchases is viewed by managers as being more flexible than using dividends, permitting a better opportunity to optimize investment. Managers like to repurchase shares when they feel their stock is undervalued and in an effort to affect EPS. Dividend increases and the level of share repurchases are generally paid out of residual cash flow, after investment and liquidity needs are met. Financial executives believe that retail investors have a strong preference for dividends, in spite of the tax disadvantage relative to repurchases. In contrast, executives believe that institutional investors as a class have no strong preference between dividends and repurchases. In general, management views provide at most moderate support for agency, signaling, and clientele hypotheses of payout policy. Tax considerations play only a secondary role. By highlighting where the theory and practice of corporate payout policy are consistent and where they are not, we attempt to shed new light on important unresolved issues related to payout policy in the 21st century.

    Final conversations: Overview and practical implications for patients, families, and healthcare workers

    Get PDF
    The current paper presents a summary of a 12-year body of research on final conversations, which will be useful for healthcare providers who work with patients and family nearing the end-of-life, as well as for patients and their family members. Final conversations encompass any and all conversations that occur between individuals with a terminal diagnosis and their family members (all participants are aware that their loved one is in the midst of the death journey). Final conversations take the family member’s perspective and highlights what are their memorable messages with the terminally ill loved one. In this paper the authors highlight the message themes present at the end-of-life for both adults and children, the functions each message theme serves for family members, and lastly, the communicative challenges of final conversations. Additionally, the authors discuss the current nature and future of final conversations research, with special attention paid to practical implications for healthcare providers, patients, and family members; also, scholarly challenges and future research endeavors are explored

    Climate Change in Northern New Hampshire: Past, Present and Future

    Get PDF
    EARTH’S CLIMATE CHANGES. It always has and always will. However, an extensive and growing body of scientific evidence indicates that human activities—including the burning of fossil fuel (coal, oil, and natural gas) for energy, clearing of forested lands for agriculture, and raising livestock—are now the primary force driving change in the Earth’s climate system. This report describes how the climate of northern New Hampshire has changed over the past century and how the future climate of the region will be affected by a warmer planet due to human activities

    Climate Change in Southern New Hampshire: Past, Present and Future

    Get PDF
    EARTH’S CLIMATE CHANGES. It always has and always will. However, an extensive and growing body of scientific evidence indicates that human activities—including the burning of fossil fuel (coal, oil, and natural gas) for energy, clearing of forested lands for agriculture, and raising livestock—are now the primary force driving change in the Earth’s climate system. This report describes how the climate of southern New Hampshire has changed over the past century and how the future climate of the region will be affected by a warmer planet due to human activities

    A COMPARISON OF YOUTH PITCHING KINEMATICS ACROSS PREPUBESCENT AND PUBESCENT PITCHERS

    Get PDF
    To reduce injuries in youth baseball pitchers coaches teach proper mechanics at a young age. Unfortunately, the mechanics taught to beginning pitchers are based on data from adolescent pitchers and may result in techniques that could injure younger pitchers. Thus, the purpose of this study was to identify differences between the pitching mechanics of prepubescent and pubescent baseball pitchers. Of the 20 parameters analyzed in the study, 7 were observed to be different between the two groups. The findings of this study indicate that the mechanics currently being taught to youth pitchers may not be appropriate for all ages and that furthur study is needed to help identify what mechanics are correct for all ages of pitchers. The data produced in this study may help clinicians appreciate the mechanical differences between pitchers of various ages and better understand the etiology of pitching injuries as they relate to age

    UPPER AND LOWER EXTREMITY MUSCLE FIRING PATTERNS DURING THE WINDMILL SOFTBALL PITCH

    Get PDF
    The purpose of this study was to describe the activity of both the upper and lower extremity muscles during the windmill softball pitch. Seven female post-pubescent softball pitchers volunteered for the study. Pitchers were analyzed with surface electromyography, and motion analysis software. The muscle firing patterns were described during five phases of the windmill softball pitch
    • 

    corecore