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
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01 Jan 1995TL;DR: A street history of El Barrio can be found in this paper, where the authors discuss addiction, discipline, and dignity of crackhouse management, and 'Goin' legit': disrespect and resistance at work.
Abstract: Acknowledgments Introduction 1. Violating apartheid in the United States 2. A street history of El Barrio 3. Crackhouse management: addiction, discipline, and dignity 4. 'Goin' legit': disrespect and resistance at work 5. School days: learning to be a better criminal 6. Redefining gender on the street 7. Families and children in pain 8. Vulnerable fathers 9. Conclusion Epilogue.
1,825 citations
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TL;DR: In this paper, the authors identify a subset of 850 stars that have Doppler observations sufficient to detect uniformly all planets with radial velocity semiamplitudes K > 30 m s-1 and orbital periods shorter than 4 yr, and determine that fewer than 3% of stars with -0.5 + 0.3 dex, 25% of observed stars have detected gas giant planets.
Abstract: We have recently carried out spectral synthesis modeling to determine Teff, log g, v sin i, and [Fe/H] for 1040 FGK-type stars on the Keck, Lick, and Anglo-Australian Telescope planet search programs. This is the first time that a single, uniform spectroscopic analysis has been made for every star on a large Doppler planet search survey. We identify a subset of 850 stars that have Doppler observations sufficient to detect uniformly all planets with radial velocity semiamplitudes K > 30 m s-1 and orbital periods shorter than 4 yr. From this subset of stars, we determine that fewer than 3% of stars with -0.5 +0.3 dex, 25% of observed stars have detected gas giant planets. A power-law fit to these data relates the formation probability for gas giant planets to the square of the number of metal atoms. High stellar metallicity also appears to be correlated with the presence of multiple-planet systems and with the total detected planet mass. This data set was examined to better understand the origin of high metallicity in stars with planets. None of the expected fossil signatures of accretion are observed in stars with planets relative to the general sample: (1) metallicity does not appear to increase as the mass of the convective envelopes decreases, (2) subgiants with planets do not show dilution of metallicity, (3) no abundance variations for Na, Si, Ti, or Ni are found as a function of condensation temperature, and (4) no correlations between metallicity and orbital period or eccentricity could be identified. We conclude that stars with extrasolar planets do not have an accretion signature that distinguishes them from other stars; more likely, they are simply born in higher metallicity molecular clouds.
1,624 citations
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United States Environmental Protection Agency1, University of Maryland Center for Environmental Science2, North Carolina State University3, Woods Hole Oceanographic Institution4, San Francisco State University5, National Oceanic and Atmospheric Administration6, Stony Brook University7, University of South Florida St. Petersburg8, Delaware Department of Natural Resources and Environmental Control9, University of South Carolina10, South Carolina Department of Natural Resources11, Maryland Department of Natural Resources Police12, Old Dominion University13, Chesapeake Research Consortium14, University of Alaska Fairbanks15
TL;DR: In January 2003, the US Environmental Protection Agency sponsored a "roundtable discussion" to develop a consensus on the relationship between eutrophication and harmful algal blooms, specifically targeting those relationships for which management actions may be appropriate.
1,622 citations
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TL;DR: In this article, the authors presented a catalog of stellar properties for 1040 nearby F, G, and K stars that have been observed by the Keck, Lick, and AAT planet search programs.
Abstract: We present a uniform catalog of stellar properties for 1040 nearby F, G, and K stars that have been observed by the Keck, Lick, and AAT planet search programs. Fitting observed echelle spectra with synthetic spectra yielded effective temperature, surface gravity, metallicity, projected rotational velocity, and abundances of the elements Na, Si, Ti, Fe, and Ni, for every star in the catalog. Combining V-band photometry and Hipparcos parallaxes with a bolometric correction based on the spectroscopic results yielded stellar luminosity, radius, and mass. Interpolating Yonsei-Yale isochrones to the luminosity, effective temperature, metallicity, and α-element enhancement of each star yielded a theoretical mass, radius, gravity, and age range for most stars in the catalog. Automated tools provide uniform results and make analysis of such a large sample practical. Our analysis method differs from traditional abundance analyses in that we fit the observed spectrum directly, rather than trying to match equivalent widths, and we determine effective temperature and surface gravity from the spectrum itself, rather than adopting values based on measured photometry or parallax. As part of our analysis, we determined a new relationship between macroturbulence and effective temperature on the main sequence. Detailed error analysis revealed small systematic offsets with respect to the Sun and spurious abundance trends as a function of effective temperature that would be inobvious in smaller samples. We attempted to remove these errors by applying empirical corrections, achieving a precision per spectrum of 44 K in effective temperature, 0.03 dex in metallicity, 0.06 dex in the logarithm of gravity, and 0.5 km s-1 in projected rotational velocity. Comparisons with previous studies show only small discrepancies. Our spectroscopically determined masses have a median fractional precision of 15%, but they are systematically 10% higher than masses obtained by interpolating isochrones. Our spectroscopic radii have a median fractional precision of 3%. Our ages from isochrones have a precision that varies dramatically with location in the Hertzsprung-Russell diagram. We plan to extend the catalog by applying our automated analysis technique to other large stellar samples.
1,571 citations
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University College London1, University of Texas at Austin2, Goethe University Frankfurt3, Goddard Space Flight Center4, Utrecht University5, University of Rennes6, James Cook University7, University of California, Irvine8, University of Oxford9, United States Geological Survey10, United States Department of Agriculture11, Sun Yat-sen University12, British Geological Survey13, Rutgers University14, Colorado School of Mines15, San Francisco State University16, Simon Fraser University17, University of East Anglia18, Cranfield University19
TL;DR: In this paper, the authors critically review recent research assessing the impacts of climate on ground water through natural and human-induced processes as well as through groundwater-driven feedbacks on the climate system, and highlight the possible opportunities and challenges of using and sustaining groundwater resources in climate adaptation strategies.
Abstract: As the world's largest distributed store of fresh water, ground water plays a central part in sustaining ecosystems and enabling human adaptation to climate variability and change. The strategic importance of ground water for global water and food security will probably intensify under climate change as more frequent and intense climate extremes (droughts and floods) increase variability in precipitation, soil moisture and surface water. Here we critically review recent research assessing the impacts of climate on ground water through natural and human-induced processes as well as through groundwater-driven feedbacks on the climate system. Furthermore, we examine the possible opportunities and challenges of using and sustaining groundwater resources in climate adaptation strategies, and highlight the lack of groundwater observations, which, at present, limits our understanding of the dynamic relationship between ground water and climate.
1,536 citations
Authors
Showing all 5744 results
Name | H-index | Papers | Citations |
---|---|---|---|
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 |