1,645 research outputs found
Palynofacies classification of the depositional elements of confined turbidite systems : Examples from the Gres d'Annot, SE France
Acknowledgements We thank BG Brasil for financial support for this project and permission to publish. BG Group is a wholly owned subsidiary of Royal Dutch Shell. McArthur is grateful to the Coordenação de Aperfeiçoamento de Pessoal de NĂvel Superior (CAPES) for the scholarship 049/2012. The AgĂȘncia Nacional do PetrĂłleo (ANP) are thanked for supporting this project. Massimo Zecchin is thanked for handling this paper and Roberto Tinterri is thanked for his constructive review, in addition to an anonymous reviewer.Peer reviewedPostprin
Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
Radial velocity measurements of stellar reflex motion have revealed many
extrasolar planets, but gaps in the observations produce aliases, spurious
frequencies that are frequently confused with the planets' orbital frequencies.
In the case of Gl 581 d, the distinction between an alias and the true
frequency was the distinction between a frozen, dead planet and a planet
possibly hospitable to life (Udry et al. 2007; Mayor et al. 2009). To improve
the characterization of planetary systems, we describe how aliases originate
and present a new approach for distinguishing between orbital frequencies and
their aliases. Our approach harnesses features in the spectral window function
to compare the amplitude and phase of predicted aliases with peaks present in
the data. We apply it to confirm prior alias distinctions for the planets GJ
876 d and HD 75898 b. We find that the true periods of Gl 581 d and HD 73526
b/c remain ambiguous. We revise the periods of HD 156668 b and 55 Cnc e, which
were afflicted by daily aliases. For HD 156668 b, the correct period is 1.2699
days and minimum mass is (3.1 +/- 0.4) Earth masses. For 55 Cnc e, the correct
period is 0.7365 days -- the shortest of any known planet -- and minimum mass
is (8.3 +/- 0.3) Earth masses. This revision produces a significantly improved
5-planet Keplerian fit for 55 Cnc, and a self-consistent dynamical fit
describes the data just as well. As radial velocity techniques push to
ever-smaller planets, often found in systems of multiple planets,
distinguishing true periods from aliases will become increasingly important.Comment: Accepted by ApJ (in press); 19 pages, 22 figures. Fixed typos;
improved wording; added more extensive discussion of orbital eccentricity;
improved figure captions; additional reference
SPEAM-II experiment for the measurement of stratospheric NO2, O3 and aerosols
Following the success of the Sunphotometer Earth Atmosphere Measurement (SPEAM-I) experiment, a more involved experiment was developed to fly as part of the second set of Canadian Experiments (CANEX-2) which will fly on the US Space Shuttle in the fall of 1992. The instrument complement includes an IBM-PC compatible control computer, a hand-held diode array spectrophotometer, and an interference-filter, limb imaging radiometer for the measurement of the atmospheric airglow. The hand-held spectrometer will measure nitrogen dioxide, ozone and aerosols. The limb imaging radiometer will observe emissions from the O2(1 DELTA) and O2(1 SIGMA) airglow bands. Only the spectrophotometer will be discussed here
Darboux Transformations for Supersymmetric Korteweg - de Vries Equations
\hspace{.2in}We consider the Darboux type transformations for the spectral
problems of supersymmetric KdV systems. The supersymmetric analogies of Darboux
and Darboux-Levi transformations are established for the spectral problems of
Manin-Radul-Mathieu sKdV and Manin-Radul sKdV. Several B\"acklund
transformations are derived for the MRM sKdV and MR sKdV systems.Comment: Latex, 8 pages AS-ITP-94-4
Effective Average Action in N=1 Super-Yang-Mills Theory
For N=1 Super-Yang-Mills theory we generalize the effective average action
Gamma_k in a manifest supersymmetric way using the superspace formalism. The
exact evolution equation for Gamma_k is derived and, introducing as an
application a simple truncation, the standard one-loop beta-function of N=1 SYM
theory is obtained.Comment: 17 pages, LaTeX, some remarks added, misprints corrected, to appear
in Phys. Rev.
Endogenous annexin A1 is a novel protective determinant in nonalcoholic steatohepatitis in mice
Macrophage-derived AnxA1 plays a functional role in modulating hepatic inflammation and fibrogenesis during NASH progression, suggesting the possible use of AnxA1 analogs for therapeutic control of this disease
The Distance to the Hyades Cluster Based on Hubble Space Telescope Fine Guidance Sensor Parallaxes
Trigonometric parallax observations made with the Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) 3 of seven Hyades members in six ïŹelds of view have been analyzed along with their proper motions to determine the distance to the cluster. Knowledge of the convergent point and mean proper motion of the Hyades is critical to the derivation of the distance to the center of the cluster. Depending on the choice of the proper-motion system, the derived cluster center distance varies by 9%. Adopting a reference distance of 46.1 pc or m ÏȘ M Ï 3.32, which is derived from the ground-based parallaxes in the General Catalogue of Trigonometric Stellar Parallaxes (1995 edition), the FK5/PPM proper-motion system yields a distance 4% larger, while the Hanson system yields a distance 2% smaller. The HST FGS parallaxes reported here yield either a 14% or 5% larger distance, depending on the choice of the proper-motion system. Orbital parallaxes (Torres et al.) yield an average distance 4% larger than the reference distance. The variation in the distance derived from the HST data illustrates the importance of the proper-motion system and the individual proper motions to the derivation of the distance to the Hyades center; therefore, a full utilization of the HST FGS parallaxes awaits the establishment of an accurate and consistent proper-motion system
Wess-Zumino Terms in Supersymmetric Gauge Theories
The Wess-Zumino term is constructed for supersymmetric QCD with two colors
and flavors, and is shown to correctly reproduce the anomalous Ward identities.
Supersymmetric QCD is also shown not to have topologically stable skyrmion
solutions because of baryon flat directions, which allow them to unwind. The
generalization of these results to other supersymmetric theories with quantum
modified constraints is discussed.Comment: 4 pages (revtex
Dreaming of drams: Authenticity in Scottish whisky tourism as an expression of unresolved Habermasian rationalities
In this paper, the production of whisky tourism at both independently owned and corporately owned distilleries in Scotland is explored by focusing on four examples (Arran, Glengoyne, Glenturret and Bruichladdich). In particular, claims of authenticity and Scottishness of Scottish whiskies through commercial materials, case studies, website-forum discussions and 'independent' writing about such whisky are analysed. It is argued that the globalisation and commodification of whisky and whisky tourism, and the communicative backlash to these trends typified by the search for authenticity, is representative of a Habermasian struggle between two irreconcilable rationalities. This paper will demonstrate that the meaning and purpose of leisure can be understood through such explorations of the tension between the instrumentality of commodification and the freedom of individuals to locate their own leisure lives in the lifeworld that remains. © 2011 Taylor & Francis
The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements
We have obtained high resolution images of the central regions of 14
reverberation-mapped active galactic nuclei (AGN) using the Hubble Space
Telescope Advanced Camera for Surveys High Resolution Camera to account for
host-galaxy starlight contamination of measured AGN luminosities. We measure
the host-galaxy starlight contribution to the continuum luminosity at 5100 A
through the typical ground-based slit position and geometry used in the
reverberation-mapping campaigns. We find that removing the starlight
contribution results in a significant correction to the luminosity of each AGN,
both for lower luminosity sources, as expected, but also for the higher
luminosity sources such as the PG quasars. After accounting for the host galaxy
starlight, we revisit the well-known broad-line region radius--luminosity
relationship for nearby AGN. We find the power-law slope of the relationship
for the H beta line to be 0.518 +/- 0.039, shallower than previously reported
and consistent with the slope of 0.5 expected from the naive theoretical
assumption that all AGN have, on average, the same ionizing spectrum and the
same ionization parameter and gas density in the H beta line-emitting region.Comment: 27 pages, 5 tables, 4 figures, accepted to ApJ; full resolution
figures available at
http://www.astronomy.ohio-state.edu/~bentz/astroph0602412.htm
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