Institution
Saint Mary's University
Education•Halifax, Nova Scotia, Canada•
About: Saint Mary's University is a education organization based out in Halifax, Nova Scotia, Canada. It is known for research contribution in the topics: Population & Stars. The organization has 1931 authors who have published 4993 publications receiving 143226 citations.
Topics: Population, Stars, Galaxy, Volcanic rock, Basalt
Papers published on a yearly basis
Papers
More filters
••
TL;DR: The meaning of land and land policies is diverse and contested across and within local and (inter)national settings as mentioned in this paper, and the meaning of policies that have anything to do with land may be convenient, but it masks the actual complexity of issues.
Abstract: The meaning of land and land policies is diverse and contested across and within local and (inter)national settings.The phrase ‘land policy’, used to refer to all policies that have anything to do with land, may be convenient, but it masks the actual complexity of issues. Meanwhile, concern for ‘pro-poor’ land policy has coincided with the mainstream promotion of efficient administration of land policies, leading to the concept of ‘land governance’. Such concepts have enriched discussion on land issues, but they also complicate further an already complex terrain. In response, this paper offers possible analytical signposts, rather than an actual in-depth and elaborated analytical exploration of this terrain. It hopes to be a modest step forward and towards a better understanding of contemporary policy discourses and political contestations around land and land governance. _JOAC 1..32
175 citations
••
Kavli Institute for Theoretical Physics1, Centre national de la recherche scientifique2, University of Birmingham3, Paris Diderot University4, Saint Mary's University5, Tata Institute of Fundamental Research6, University of Sydney7, Aarhus University8, University of Porto9, Yale University10, University of Amsterdam11, University of La Laguna12, Spanish National Research Council13, University of Nice Sophia Antipolis14, University of Toulouse15, High Altitude Observatory16, Max Planck Society17, Pennsylvania State University18, Ames Research Center19
TL;DR: In this article, the authors used a time series of nine months of data for each star and classified them into three groups: simple, F-like, and mixed-mode.
Abstract: Context. Solar-like oscillations have been observed by Kepler and CoRoT in several solar-type stars, thereby providing a way to probe the stars using asteroseismology Aims. We provide the mode frequencies of the oscillations of various stars required to perform a comparison with those obtained from stellar modelling. Methods. We used a time series of nine months of data for each star. The 61 stars observed were categorised in three groups: simple, F-like, and mixed-mode. The simple group includes stars for which the identification of the mode degree is obvious. The F-like group includes stars for which the identification of the degree is ambiguous. The mixed-mode group includes evolved stars for which the modes do not follow the asymptotic relation of low-degree frequencies. Following this categorisation, the power spectra of the 61 main-sequence and subgiant stars were analysed using both maximum likelihood estimators and Bayesian estimators, providing individual mode characteristics such as frequencies, linewidths, and mode heights. We developed and describe a methodology for extracting a single set of mode frequencies from multiple sets derived by different methods and individual scientists. We report on how one can assess the quality of the fitted parameters using the likelihood ratio test and the posterior probabilities. Results. We provide the mode frequencies of 61 stars (with their 1-σ error bars), as well as their associated echelle diagrams.
175 citations
••
Aarhus University1, Space Science Institute2, University of Paris3, High Altitude Observatory4, National Center for Atmospheric Research5, University of Sydney6, University of Birmingham7, National Institute of Standards and Technology8, University of Tokyo9, Kavli Institute for Theoretical Physics10, University of Wisconsin-Madison11, Florida Gulf Coast University12, Ege University13, University of Porto14, University of Toulouse15, Centre national de la recherche scientifique16, Konkoly Thege Miklós Astronomical Institute17, Eötvös Loránd University18, INAF19, Paris Diderot University20, Los Alamos National Laboratory21, Homi Bhabha Centre for Science Education22, University of Liège23, Spanish National Research Council24, Polish Academy of Sciences25, Romanian Academy26, Saint Mary's University27, University of Colorado Boulder28, University of Göttingen29
TL;DR: In this article, the authors used previously published asteroseismic and spectroscopic data sets to provide a uniform analysis of 42 solar-type Kepler targets, and found that fitting the individual frequencies typically doubled the precision of the asterosityismic radius, mass, and age compared to grid-based modeling of the global oscillation properties, and improved the radius and mass by about a factor of three over empirical scaling relations.
Abstract: Recently the number of main-sequence and subgiant stars exhibiting solar-like oscillations that are resolved into individual mode frequencies has increased dramatically. While only a few such data sets were available for detailed modeling just a decade ago, the Kepler mission has produced suitable observations for hundreds of new targets. This rapid expansion in observational capacity has been accompanied by a shift in analysis and modeling strategies to yield uniform sets of derived stellar properties more quickly and easily. We use previously published asteroseismic and spectroscopic data sets to provide a uniform analysis of 42 solar-type Kepler targets from the Asteroseismic Modeling Portal. We find that fitting the individual frequencies typically doubles the precision of the asteroseismic radius, mass, and age compared to grid-based modeling of the global oscillation properties, and improves the precision of the radius and mass by about a factor of three over empirical scaling relations. We demonstrate the utility of the derived properties with several applications.
174 citations
••
TL;DR: In this paper, a review of the activation, aggregation and degradation of white phosphorus by molecules containing reactive p-block centers has been presented, where the chemistry has been divided into a number of reaction types and possible mechanisms are used to aid in the understanding of these reactions.
174 citations
••
TL;DR: In this article, the authors conducted a multi-wavelength survey of 42 radio loud narrow-1ine Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources of this type and omitting those with steep radio spectra.
Abstract: We have conducted a multiwavelength survey of 42 radio loud narrow-1ine Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources of this type and omitting those with steep radio spectra. We analyse data from radio frequencies to X-rays, and supplement these with information available from online catalogues and the literature in order to cover the full electromagnetic spectrum. This is the largest known multiwavelength survey for this type of source. We detected 90% of the sources in X-rays and found 17% at γ rays. Extreme variability at high energies was also found, down to timescales as short as hours. In some sources, dramatic spectral and flux changes suggest interplay between a relativistic jet and the accretion disk. The estimated masses of the central black holes are in the range ~106−8 M ⊙ , lower than those of blazars, while the accretion luminosities span a range from ~0.01 to ~0.49 times the Eddington limit, with an outlier at 0.003, similar to those of quasars. The distribution of the calculated jet power spans a range from ~1042.6 to ~1045.6 erg s-1 , generally lower than quasars and BL Lac objects, but partially overlapping with the latter. Once normalised by the mass of the central black holes, the jet power of the three types of active galactic nuclei are consistent with each other, indicating that the jets are similar and the observational differences are due to scaling factors. Despite the observational differences, the central engine of RLNLS1s is apparently quite similar to that of blazars. The historical difficulties in finding radio-loud narrow-line Seyfert 1 galaxies might be due to their low power and to intermittent jetactivity.
173 citations
Authors
Showing all 1958 results
Name | H-index | Papers | Citations |
---|---|---|---|
Scott Chapman | 118 | 579 | 46199 |
Michael J. Zaworotko | 97 | 519 | 44441 |
Brad K. Gibson | 94 | 564 | 38959 |
Christine D. Wilson | 90 | 528 | 39198 |
Peter A. Cawood | 87 | 362 | 27832 |
Mark D. Fleming | 81 | 433 | 36107 |
Julian Barling | 75 | 262 | 22478 |
Winslow R. Briggs | 74 | 269 | 19375 |
Ian G. McCarthy | 71 | 204 | 17912 |
Tomislav Friščić | 70 | 294 | 18307 |
Nico Eisenhauer | 66 | 400 | 15746 |
Warren E. Piers | 64 | 217 | 14555 |
Amanda I. Karakas | 63 | 321 | 12797 |
Yuichi Terashima | 59 | 259 | 11994 |
Colin Mason | 58 | 236 | 12490 |