7,174 research outputs found
The Institute of Archaeology & Siegfried H. Horn Museum Newsletter Volume 27.1
2005 ASOR Annual Meeting, Paul J. Ray, Jr.
Larsa Archive, Paul-Alain Beaulieu
Rainey Lecture, Darrell J. Rohl
Al-Maktába: The Bookstore
Random Surveyhttps://digitalcommons.andrews.edu/iaham-news/1025/thumbnail.jp
Institute of Archaeology & Horn Archaeological Museum Newsletter Volume 21.4
Tall Umayri 2000, Larry Herr, modified by Paul J. Ray, Jr.
Jalul 2000, Randall W. Younker and David Merling
Rendsburg at AU, Moise Isaac
Beaulieu Studies Tablets, Paul J. Ray, Jr.
Madaba Plains Project 4
Random Surveyhttps://digitalcommons.andrews.edu/iaham-news/1004/thumbnail.jp
Peter J. Smith Collection
Letters, typed copy of his family reminiscence entitled "Dakota days of years ago," (38 leaves) and a newspaper clipping. Reminiscence includes mention of his family homestead in Cavalier County, a blizzard, pioneer days near Pembina, N.D., people and equipment involved in threshing, digging water wells, Olga, Bathgate, Beaulieu, and Walhalla, N.D., country school, churches, hunting, horses and horse-drawn vehicles, and removing tree stumps
Repeated Evolution of Digital Adhesion in Geckos: A Reply to Harrington and Reeder
We published a phylogenetic comparative analysis that found geckos had gained and lost adhesive toepads multiple times over their long evolutionary history (Gamble et al., PLoS One, 7, 2012, e39429). This was consistent with decades of morphological studies showing geckos had evolved adhesive toepads on multiple occasions and that the morphology of geckos with ancestrally padless digits can be distinguished from secondarily padless forms. Recently, Harrington & Reeder (J. Evol. Biol., 30, 2017, 313) reanalysed data from Gamble et al. (PLoS One, 7, 2012, e39429) and found little support for the multiple origins hypothesis. Here, we argue that Harrington and Reeder failed to take morphological evidence into account when devising ancestral state reconstruction models and that these biologically unrealistic models led to erroneous conclusions about the evolution of adhesive toepads in geckos
Planetary mass function and planetary systems
With planets orbiting stars, a planetary mass function should not be seen as
a low-mass extension of the stellar mass function, but a proper formalism needs
to take care of the fact that the statistical properties of planet populations
are linked to the properties of their respective host stars. This can be
accounted for by describing planet populations by means of a differential
planetary mass-radius-orbit function, which together with the fraction of stars
with given properties that are orbited by planets and the stellar mass function
allows to derive all statistics for any considered sample. These fundamental
functions provide a framework for comparing statistics that result from
different observing techniques and campaigns which all have their very specific
selection procedures and detection efficiencies. Moreover, recent results both
from gravitational microlensing campaigns and radial-velocity surveys of stars
indicate that planets tend to cluster in systems rather than being the lonely
child of their respective parent star. While planetary multiplicity in an
observed system becomes obvious with the detection of several planets, its
quantitative assessment however comes with the challenge to exclude the
presence of further planets. Current exoplanet samples begin to give us first
hints at the population statistics, whereas pictures of planet parameter space
in its full complexity call for samples that are 2-4 orders of magnitude
larger. In order to derive meaningful statistics however, planet detection
campaigns need to be designed in such a way that well-defined
fully-deterministic target selection, monitoring, and detection criteria are
applied. The probabilistic nature of gravitational microlensing makes this
technique an illustrative example of all the encountered challenges and
uncertainties.Comment: 7 pages, MNRAS accepte
Towards A Census of Earth-mass Exo-planets with Gravitational Microlensing
Thirteen exo-planets have been discovered using the gravitational
microlensing technique (out of which 7 have been published). These planets
already demonstrate that super-Earths (with mass up to ~10 Earth masses) beyond
the snow line are common and multiple planet systems are not rare. In this
White Paper we introduce the basic concepts of the gravitational microlensing
technique, summarise the current mode of discovery and outline future steps
towards a complete census of planets including Earth-mass planets. In the
near-term (over the next 5 years) we advocate a strategy of automated follow-up
with existing and upgraded telescopes which will significantly increase the
current planet detection efficiency. In the medium 5-10 year term, we envision
an international network of wide-field 2m class telescopes to discover
Earth-mass and free-floating exo-planets. In the long (10-15 year) term, we
strongly advocate a space microlensing telescope which, when combined with
Kepler, will provide a complete census of planets down to Earth mass at almost
all separations. Such a survey could be undertaken as a science programme on
Euclid, a dark energy probe with a wide-field imager which has been proposed to
ESA's Cosmic Vision Programme.Comment: 10 pages. White Paper submission to the ESA Exo-Planet Roadmap
Advisory Team. See also "Inferring statistics of planet populations by means
of automated microlensing searches" by M. Dominik et al. (arXiv:0808.0004
Lexique de l’information, par J. Guilhaumou, Entreprise Moderne d’Édition, Paris, 1969, 121 pp.
- …