15,847 research outputs found
Mapping Ocean Wealth
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
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
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
An analysis of the case records at the Boston University speech clinic from 1948 through 1950
Thesis (Ed.M.)--Boston Universit
Early Excitation of Spin-Orbit Misalignments in Close-in Planetary Systems
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
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
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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