21,345 research outputs found

    Toward Understanding Philippine Trade in Services: A Demand Approach

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    This article investigates the determinants of Philippine trade in commercial services, and makes an attempt to explain the historical trends and movements in aggregated services exports and imports in relation to variables such as income, relative price, merchandise trade, services sector size and investor sentiment.services sector, income, trade in services

    Baryogenesis in Lorentz-violating gravity theories

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    Lorentz-violating theories of gravity typically contain constrained vector fields. We show that the lowest-order coupling of such vectors to U(1)\mathrm{U}(1)-symmetric scalars can naturally give rise to baryogenesis in a manner akin to the Affleck-Dine mechanism. We calculate the cosmology of this new mechanism, demonstrating that a net B−LB-L can be generated in the early Universe, and that the resulting baryon-to-photon ratio matches that which is presently observed. We discuss constraints on the model using solar system and astrophysical tests of Lorentz violation in the gravity sector. Generic Lorentz-violating theories can give rise to the observed matter-antimatter asymmetry without violating any current bounds.Comment: Five pages, two figures, submitted to PL

    Toward Understanding Philippine Trade in Services: A Demand Approach

    Get PDF
    This article investigates the determinants of Philippine trade in commercial services, and makes an attempt to explain the historical trends and movements in aggregated services exports and imports in relation to variables such as income, relative price, merchandise trade, services sector size and investor sentiment.services sector, income, trade in services

    Evaluating Lossy Collections for Java Applications

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    We propose to remove live objects from near-full heaps to reduce memory pressure. We modify Java Collections to enable lossy behavior. Some DaCapo benchmarks tolerate an amount of live data loss

    Monoclonal antibodies to the cells of a regenerating limb

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    Monoclonal antibodies were raised against differentiated cells, and blastemal cells from regenerating limbs of adult newts (Notophthalmus viridescens) and screened for specific staining by immunocytochemistry. In addition to antibodies that identify muscle, Schwann cells and cartilage, two reagents were specific for subpopulations of blastemal cells. One of these latter antibodies, termed 22/18, has provided new evidence about the origin of blastemal cells from Schwann cells and rnyofibres, and also identifies blastemal cells whose division is persistently dependent on the nerve supply

    Change-point model on nonhomogeneous Poisson processes with application in copy number profiling by next-generation DNA sequencing

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    We propose a flexible change-point model for inhomogeneous Poisson Processes, which arise naturally from next-generation DNA sequencing, and derive score and generalized likelihood statistics for shifts in intensity functions. We construct a modified Bayesian information criterion (mBIC) to guide model selection, and point-wise approximate Bayesian confidence intervals for assessing the confidence in the segmentation. The model is applied to DNA Copy Number profiling with sequencing data and evaluated on simulated spike-in and real data sets.Comment: Published in at http://dx.doi.org/10.1214/11-AOAS517 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org

    High-Resolution Spectroscopy of Ursa Major Moving Group Stars

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    We use new and extant literature spectroscopy to address abundances and membership for UMa moving group stars. We first compare the UMa, Coma, and Hyades H-R diagrams via a homogeneous set of isochrones, and find that these three aggregates are essentially coeval. Our spectroscopy of cool UMa dwarfs reveals striking abundance anomalies--trends with Teff, ionization state, and excitation potential--like those recently seen in young cool M34, Pleaides, and Hyades dwarfs. In particular, the trend of rising 7774 Ang-based OI abundance with declining Teff is markedly subdued in UMa compared to the Pleiades, suggesting a dependence on age or metallicity. Despite disparate sources of Li data,our homogeneous analysis indicates that UMa members evince remarkably small scatter in the Li-Teff plane for Teff>5200 K. Significant star-to-star scatter suggested by previous studies is seen for cooler stars. Comparison with the consistently determined Hyades Li-Teff trend reveals differences qualitatively consistent with this cluster's larger [Fe/H] (and perhaps slightly larger age). However, quantitative comparison with standard stellar models indicates the differences are smaller than expected, suggesting the action of a fourth parameter beyond age, mass, and [Fe/H] controlling Li depletion.Comment: To appear in Publ. Astron. Soc. Pacif. (September 2005
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