4,128 research outputs found

    Method of Studying Ξ›b0\Lambda_b^0 decays with one missing particle

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    A new technique is discussed that can be applied to Ξ›b0\Lambda_b^0 baryon decays where decays with one missing particle can be discerned from background and their branching fractions determined, along with other properties of the decays. Applications include measurements of the CKM elements ∣Vub∣|V_{ub}| and ∣Vcb∣|V_{cb}|, selected charmless decays, and detection of any exotic objects coupling to bβ†’sb\to s decays, such as the inflaton.Comment: 6 pages, 2 figures, updated for referees comments on July 16, 201

    Generators of simple modular Lie superalgebras

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    Let XX be one of the finite-dimensional simple graded Lie superalgebras of Cartan type W,S,H,K,HO,KO,SHOW, S, H, K, HO, KO, SHO or SKOSKO over an algebraically closed field of characteristic p>3p>3. In this paper we prove that XX can be generated by one element except the ones of type W,W, HOHO, KOKO or SKOSKO in certain exceptional cases, in which XX can be generated by two elements. As a subsidiary result, we also prove that certain classical Lie superalgebras or their relatives can be generated by one or two elements

    Land-use change simulation and assessment of driving factors in the loess hilly region - a case study as Pengyang County

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    The main objective of this study is to evaluate the land-use change and its relationship with its driving factors in the loess hilly region. In this study, a case study was carried out in Pengyang County. We set two land-use demand scenarios (a baseline scenario (scenario 1) and a real land-use requirement scenario (scenario 2)) during year 2001-2005 via assuming the effect of driving factors on land-use change keeps stable from 1993 to 2005. Two simulated land-use patterns of 2005 are therefore achieved accordingly by use of the conversion of land use and its effects model at small regional extent. Kappa analyses are conducted to compare each simulated land-use pattern with the reality. Results show that (1) the associated kappa values were decreased from 0.83 in 1993-2000 to 0.27 (in scenario 1) and 0.23 (in scenario 2) in 2001-2005 and (2) forest and grassland were the land-use types with highest commission errors, which implies that conversion of both the land-use types mentioned above is the main determinant of change of kappa values. Our study indicates the land-use change was driven by the synthetic multiply factors including natural and social-economic factors (e.g., slope, aspect, elevation, distance to road, soil types, and population dense) in 1993-2000 until "Grain for Green Project" was implemented and has become the dominant factor in 2001-2005
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