Institution
San Francisco State University
Education•San Francisco, California, United States•
About: San Francisco State University is a education organization based out in San Francisco, California, United States. It is known for research contribution in the topics: Population & Planet. The organization has 5669 authors who have published 11433 publications receiving 408075 citations. The organization is also known as: San Francisco State & San Francisco State Normal School.
Topics: Population, Planet, Poison control, Exoplanet, Planetary system
Papers published on a yearly basis
Papers
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TL;DR: A noninvasive PCR sampling technique is described that can be used to screen museum specimens from other amphibian decline sites around the world and finds evidence of a historical “Bd epidemic wave” that began in Mexico and subsequently spread to Central America.
Abstract: Amphibians highlight the global biodiversity crisis because ∼40% of all amphibian species are currently in decline. Species have disappeared even in protected habitats (e.g., the enigmatic extinction of the golden toad, Bufo periglenes, from Costa Rica). The emergence of a fungal pathogen, Batrachochytrium dendrobatidis (Bd), has been implicated in a number of declines that have occurred in the last decade, but few studies have been able to test retroactively whether Bd emergence was linked to earlier declines and extinctions. We describe a noninvasive PCR sampling technique that detects Bd in formalin-preserved museum specimens. We detected Bd by PCR in 83–90% (n = 38) of samples that were identified as positive by histology. We examined specimens collected before, during, and after major amphibian decline events at established study sites in southern Mexico, Guatemala, and Costa Rica. A pattern of Bd emergence coincident with decline at these localities is revealed—the absence of Bd over multiple years at all localities followed by the concurrent emergence of Bd in various species at each locality during a period of population decline. The geographical and chronological emergence of Bd at these localities also indicates a southbound spread from southern Mexico in the early 1970s to western Guatemala in the 1980s/1990s and to Monteverde, Costa Rica by 1987. We find evidence of a historical “Bd epidemic wave” that began in Mexico and subsequently spread to Central America. We describe a technique that can be used to screen museum specimens from other amphibian decline sites around the world.
264 citations
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Harvard University1, San Jose State University2, Ames Research Center3, Las Cumbres Observatory Global Telescope Network4, Niels Bohr Institute5, NASA Exoplanet Science Institute6, Lowell Observatory7, University of Florida8, California Institute of Technology9, Space Telescope Science Institute10, San Francisco State University11, University of California, Berkeley12, Villanova University13, Fermilab14, San Diego State University15
TL;DR: In this article, a procedure (BLENDER) is described to model the photometry in terms of a "blend" rather than a planet orbiting a star, where a blend may consist of a background or foreground eclipsing binary (or star-planet pair) whose eclipses are attenuated by the light of the candidate and possibly other stars within the photometric aperture.
Abstract: Light curves from the Kepler Mission contain valuable information on the nature of the phenomena producing the transit-like signals. To assist in exploring the possibility that they are due to an astrophysical false positive, we describe a procedure (BLENDER) to model the photometry in terms of a “blend” rather than a planet orbiting a star. A blend may consist of a background or foreground eclipsing binary (or star–planet pair) whose eclipses are attenuated by the light of the candidate and possibly other stars within the photometric aperture. We apply BLENDER to the case of Kepler-9 (KIC 3323887), a target harboring two previously confirmed Saturn-size planets (Kepler-9 b and Kepler-9 c) showing transit timing variations, and an additional shallower signal with a 1.59 day period suggesting the presence of a super-Earth-size planet. Using BLENDER together with constraints from other follow-up observations we are able to rule out all blends for the two deeper signals and provide independent validation of their planetary nature. For the shallower signal, we rule out a large fraction of the false positives that might mimic the transits. The false alarm rate for remaining blends depends in part (and inversely) on the unknown frequency of small-size planets. Based on several realistic estimates of this frequency, we conclude with very high confidence that this small signal is due to a super-Earth-size planet (Kepler-9 d) in a multiple system, rather than a false positive. The radius is determined to be 1.64 +0.19 −0.14 R⊕, and current spectroscopic observations are as yet insufficient to establish its mass.
264 citations
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TL;DR: In this article, the authors compared emotional display rules of Canadian, US Americans, and Japanese across cultures regarding the specific emotion, the type of interaction partner, and gender, finding that Japanese display rules permit the expression of powerful (anger, contempt, and disgust) significantly less than those of the two North American samples.
Abstract: This study investigates emotional display rules for seven basic emotions. The main goal was to compare emotional display rules of Canadians, US Americans, and Japanese across as well as within cultures regarding the specific emotion, the type of interaction partner, and gender. A total of 835 university students participated in the study. The results indicate that Japanese display rules permit the expression of powerful (anger, contempt, and disgust) significantly less than those of the two North American samples. Japanese also think that they should express positive emotions (happiness, surprise) significantly less than the Canadian sample. Furthermore, Japanese varied the display rules for different interaction partners more than the two North American samples did only for powerful emotions. Gender differences were similar across all three cultural groups. Men expressed powerful emotions more than women and women expressed powerless emotions (sadness, fear) and happiness more than men. Depending on the type of emotion and interaction partner some shared display rules occurred across culture and gender. The implications of these findings are discussed in relation to cultural dimensions and other cultural characteristics.
262 citations
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TL;DR: The analysis suggests that particular crackdown tactics, notably frequent police searches of participants' bodies and elevated surveillance of the precinct's public spaces, reconfigured participants' experiences of their bodies and the public spaces comprising the precinct in ways that adversely affected their capacity to engage in harm reduction.
262 citations
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University of California, Santa Cruz1, University of Florida2, Fermilab3, Search for extraterrestrial intelligence4, Ames Research Center5, Harvard University6, San Jose State University7, University of Copenhagen8, University of Texas at Austin9, Yale University10, San Francisco State University11, University of Hertfordshire12, University of California, Berkeley13, Tel Aviv University14, Las Cumbres Observatory Global Telescope Network15, University of California, Santa Barbara16
TL;DR: In this article, the authors present four sets of light curves from the Kepler spacecraft, each of which shows multiple planets transiting the same star, and report dynamical fits to the transit times, yielding possible values for the planets' masses and eccentricities.
Abstract: Eighty planetary systems of two or more planets are known to orbit stars other than the Sun. For most, the data can be sufficiently explained by non-interacting Keplerian orbits, so the dynamical interactions of these systems have not been observed. Here we present four sets of light curves from the Kepler spacecraft, each which of shows multiple planets transiting the same star. Departure of the timing of these transits from strict periodicity indicates that the planets are perturbing each other: the observed timing variations match the forcing frequency of the other planet. This confirms that these objects are in the same system. Next we limit their masses to the planetary regime by requiring the system remain stable for astronomical timescales. Finally, we report dynamical fits to the transit times, yielding possible values for the planets' masses and eccentricities. As the timespan of timing data increases, dynamical fits may allow detailed constraints on the systems' architectures, even in cases for which high-precision Doppler follow-up is impractical.
261 citations
Authors
Showing all 5744 results
Name | H-index | Papers | Citations |
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Yuri S. Kivshar | 126 | 1845 | 79415 |
Debra A. Fischer | 121 | 567 | 54902 |
Sandro Galea | 115 | 1129 | 58396 |
Vijay S. Pande | 104 | 445 | 41204 |
Howard Isaacson | 103 | 575 | 42963 |
Paul Ekman | 99 | 235 | 84678 |
Russ B. Altman | 91 | 611 | 39591 |
John Kim | 90 | 406 | 41986 |
Santi Cassisi | 89 | 471 | 30757 |
Peng Zhang | 88 | 1578 | 33705 |
Michael D. Fayer | 84 | 537 | 26445 |
Raymond G. Carlberg | 84 | 316 | 28674 |
Geoffrey W. Marcy | 83 | 550 | 82309 |
Ten Feizi | 82 | 381 | 23988 |
John W. Eaton | 82 | 298 | 26403 |