15,847 research outputs found

    It\u27s George Washington\u27s Birthday

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    Mapping Ocean Wealth

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    This document describes a major new initiative to develop detailed and spatially explicit accounting of the value of marine ecosystem services at different scales. This information will inform key decision-makers in sectors ranging from international development to insurance and extractive industries to engineering. The Nature Conservancy's vision is to change perception and utilization of marine and coastal ecosystems. Working with stakeholders, it will catalyse a transformation in ocean management toward a paradigm based on explicit understanding of how and where "ocean wealth" is built, stored and generated

    Managing an arts institutional repository

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    The article describes the background to UCA Research Online which originated from the Kultur project of 2007-2009 and then goes onto detail the management of the institutional repository at UCA

    Changing places: some practical outcomes from a reclassification project using DDC22

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    Abstract: Want to know about the practical steps involved in reclassifying an area of stock? What about some recommnedations before undertaking such a task? This is the article for you as it provides answers developed from lessons learned during a real experience, in 2005, when the author completed a reclassification project during a six-month temporary contract at the Surrey Institute of Art and Design

    Early Excitation of Spin-Orbit Misalignments in Close-in Planetary Systems

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    Continued observational characterization of transiting planets that reside in close proximity to their host stars has shown that a substantial fraction of such objects posses orbits that are inclined with respect to the spin axes of their stars. Mounting evidence for the wide-spread nature of this phenomenon has challenged the conventional notion that large-scale orbital transport occurs during the early epochs of planet formation and is accomplished via planet-disk interactions. However, recent work has shown that the excitation of spin-orbit misalignment between protoplanetary nebulae and their host stars can naturally arise from gravitational perturbations in multi-stellar systems as well as magnetic disk-star coupling. In this work, we examine these processes in tandem. We begin with a thorough exploration of the gravitationally-facilitated acquisition of spin-orbit misalignment and analytically show that the entire possible range of misalignments can be trivially reproduced. Moreover, we demonstrate that the observable spin-orbit misalignment only depends on the primordial disk-binary orbit inclination. Subsequently, we augment our treatment by accounting for magnetic torques and show that more exotic dynamical evolution is possible, provided favorable conditions for magnetic tilting. Cumulatively, our results suggest that observed spin-orbit misalignments are fully consistent with disk-driven migration as a dominant mechanism for the origin of close-in planets.Comment: 12 pages, 6 pdf figures, Accepted to The Astrophysical Journal (2014

    The Dominican Republic-- After the Caudillos

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    The Dominican Republic played a major role in the early history of NACLA, and it is therefore fitting that the country be re-examined in one of NACLA\u27s thirtieth anniversary issues. It was largely in response to the 1965 U.S. invasion and occupation of the island that a group of academics, clergy and radical activists organized a 1966 conference called the North American Congress on Latin America. The congress stayed together beyond the conference, and in February, 1967, began publishing the NACLA Newsletter, which evolved into today\u27s NACLA Report on the Americas

    A Secular Resonant Origin for the Loneliness of Hot Jupiters

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    Despite decades of inquiry, the origin of giant planets residing within a few tenths of an astronomical unit from their host stars remains unclear. Traditionally, these objects are thought to have formed further out before subsequently migrating inwards. However, the necessity of migration has been recently called into question with the emergence of in-situ formation models of close-in giant planets. Observational characterization of the transiting sub-sample of close-in giants has revealed that "warm" Jupiters, possessing orbital periods longer than roughly 10 days more often possess close-in, co-transiting planetary companions than shorter period "hot" Jupiters, that are usually lonely. This finding has previously been interpreted as evidence that smooth, early migration or in situ formation gave rise to warm Jupiter-hosting systems, whereas more violent, post-disk migration pathways sculpted hot Jupiter-hosting systems. In this work, we demonstrate that both classes of planet may arise via early migration or in-situ conglomeration, but that the enhanced loneliness of hot Jupiters arises due to a secular resonant interaction with the stellar quadrupole moment. Such an interaction tilts the orbits of exterior, lower mass planets, removing them from transit surveys where the hot Jupiter is detected. Warm Jupiter-hosting systems, in contrast, retain their coplanarity due to the weaker influence of the host star's quadrupolar potential relative to planet-disk interactions. In this way, hot Jupiters and warm Jupiters are placed within a unified theoretical framework that may be readily validated or falsified using data from upcoming missions such as TESS.Comment: 9 pages, 4 figures. Accepted for publication in the Astronomical Journa
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