4,260,032 research outputs found

    Description of Maternal Age, Parity, and Birth Spacing, in Infants with Low Birthweight in Karawang, West Java

    Full text link
    Background: Low birth weight (LBW) is a major public health problem in low income countries. LBW is associated with a range of both short and long term consequences. Maternal and fetal factors may determine the risk of LBW. This study aimed to describe the maternal age, parity, and birth spacing, ininfants with LBW, in Karawang, West Java. Subjects and Method: This was a descriptive cross-sectional study conducted at Citra Sari Husada hospital, Karawang, West Java. A sample of 70 infants with low birth weight was selected by simple random sampling. The study variables were age, parity, birth spacing, and history of delivery of previous LBW babies. The data were taken from medical records. The data of each variable were described in percent. Results: The cumulative incidence of LBW infantsin 2014 was 386 cases (20.29%) of the 1902 mothers who gave birth at Citra Sari Husada hospital, Karawang, West Java. Mothers who gave birth to LBW were mostly 20-35 years old (61.42%), 74.28% 2-3 parity, 81.42% ≥2 years birth spacing, and 92% had history of LBW baby in previous pregnancy. Conclusion: The incidence of LBW has been described by maternal age, parity, birth spacing, and history of LBW in previous pregnancy. Keywords: maternal age, parity, birth spacing, low birthweigh

    Path description of type B q-characters

    Get PDF
    We give a set of sufficient conditions for a Laurent polynomial to be the q-character of a finite-dimensional irreducible representation of a quantum affine group. We use this result to obtain an explicit path description of q-characters for a class of modules in type B. In particular, this proves a conjecture of Kuniba-Ohta-Suzuki.Comment: 32 pages, late

    Crystal Bases and Young Tableaux

    Full text link
    Let B be the crystal basis of the minus part of the quantized enveloping algebra of a semi-simple Lie algebra. Kashiwara has shown that B has a combinatorial description in terms of an embedding of B into the tensor product of B and k abstract crystals B_{i_j}, j=1,2,...,k, where the longest word in the Weyl group is s_{i_1}...s_{i_k}. We give an explicit description of the image of this embedding for classical Lie algebras of types A, B, C, D. This description is in terms of semi-standard Young tableaux of types A, B, C, D defined by Kashiwara and Nakashima.Comment: 23 pages, plain Te

    Heavy Quark Distribution Function in QCD and the AC2^2M2^2 Model

    Full text link
    We show that the phenomenological \ACM ansatz is consistent with QCD through order 1/mb1/m_b in the description of B\ra l\bar \nu_l+X_u and B\ra \gamma +X_s transitions, including their energy spectra and differential distributions. This suggests a concrete realization for the QCD distribution function, which we call the ``Roman'' function. On the other hand the \ACM model description of the end-point domain in B\ra l\bar \nu_l + X_c is incompatible with QCD: a different distribution function enters the description of b\ra c decays as compared to the transitions to the massless quarks. Both observations -- the validity of the {\ACM}-like description for heavy-to-light transitions and the emergence of the new distribution function in the b\ra c case -- are in contradiction to a recent claim in the literature. The intrinsic limitation of the \ACM model could reveal itself in different values of the effective bb quark mass from fits of the Λb\Lambda _b and BB decays.Comment: 15 pages, Latex, 2 figures are included (as 2 appended postscript files), CERN-TH.7159/94, TPI-MINN-94/2-T, UND-HEP-94-BIG02 (a few comments on the literature are added

    QCD-based description of one-particle inclusive B decays

    Get PDF
    We discuss one-particle inclusive B decays in the limit of heavy b and c quarks. Using the large-N_C limit we factorize the non-leptonic matrix elements, and we employ a short distance expansion. Modeling the remaining nonperturbative matrix elements we obtain predictions for various decay channels and compare them with existing data.Comment: LaTeX, 22 pages, 6 figures (eps); analytical and numerical results unchanged, misrepresentation of experimental data in Fig. 5 corrected, final published versio

    The world-sheet description of A and B branes revisited

    Get PDF
    We give a manifest supersymmetric description of A and B branes on Kahler manifolds using a completely local N=2 superspace formulation of the world-sheet nonlinear sigma-model in the presence of a boundary. In particular, we show that an N=2 superspace description of type A boundaries is possible, at least when the background is Kahler. This leads to an elegant and concrete setting for studying coisotropic A branes. Here, apgesan important role is played by the boundary potential, whose precise physical meaning remains to be fully understood. Duality transformations relating A and B branes in the presence of isometries are studied as well.Comment: LaTeX, 32 page
    corecore