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Executive Branch
EXECUTIVE BRANCH THE PRESIDENT BARACK H. OBAMA, Senator from Illinois and 44th President of the United States; born in Honolulu, Hawaii, August 4, 1961; received a B.A. in 1983 from Columbia University, New York City; worked as a community organizer in Chicago, IL; studied law at Harvard University, where he became the first African American president of the Harvard Law Review, and received a J.D. in 1991; practiced law in Chicago, IL; lecturer on constitutional law, University of Chicago; member, Illinois State Senate, 1997–2004; elected as a Democrat to the U.S. Senate in 2004; and served from January 3, 2005, to November 16, 2008, when he resigned from office, having been elected President; family: married to Michelle; two children: Malia and Sasha; elected as President of the United States on November 4, 2008, and took the oath of office on January 20, 2009. EXECUTIVE OFFICE OF THE PRESIDENT 1600 Pennsylvania Avenue, NW., 20500 Eisenhower Executive Office Building (EEOB), 17th Street and Pennsylvania Avenue, NW., 20500, phone (202) 456–1414, http://www.whitehouse.gov The President of the United States.—Barack H. Obama. Special Assistant to the President and Personal Aide to the President.— Anita Decker Breckenridge. Director of Oval Office Operations.—Brian Mosteller. OFFICE OF THE VICE PRESIDENT phone (202) 456–1414 The Vice President.—Joseph R. Biden, Jr. Assistant to the President and Chief of Staff to the Vice President.—Bruce Reed, EEOB, room 276, 456–9000. Deputy Assistant to the President and Chief of Staff to Dr. Jill Biden.—Sheila Nix, EEOB, room 200, 456–7458. -
2016-2017 Year Book Www
1 2016-2017 YEAR BOOK WWW. C A R N E G I E S C I E N C E . E D U Department of Embryology 3520 San Martin Dr. / Baltimore, MD 21218 410.246.3001 Geophysical Laboratory 5251 Broad Branch Rd., N.W. / Washington, DC 20015-1305 202.478.8900 Department of Global Ecology 260 Panama St. / Stanford, CA 94305-4101 650.462.1047 The Carnegie Observatories 813 Santa Barbara St. / Pasadena, CA 91101-1292 626.577.1122 Las Campanas Observatory Casilla 601 / La Serena, Chile Department of Plant Biology 260 Panama St. / Stanford, CA 94305-4101 650.325.1521 Department of Terrestrial Magnetism 5241 Broad Branch Rd., N.W. / Washington, DC 20015-1305 202.478.8820 Office of Administration 1530 P St., N.W. / Washington, DC 20005-1910 202.387.6400 2 0 1 6 - 2 0 1 7 Y E A R B O O K The President’s Report July 1, 2016 - June 30, 2017 C A R N E G I E I N S T I T U T I O N F O R S C I E N C E Former Presidents Daniel C. Gilman, 1902–1904 Robert S. Woodward, 1904–1920 John C. Merriam, 1921–1938 Vannevar Bush, 1939–1955 Caryl P. Haskins, 1956–1971 Philip H. Abelson, 1971–1978 James D. Ebert, 1978–1987 Edward E. David, Jr. (Acting President, 1987–1988) Maxine F. Singer, 1988–2002 Michael E. Gellert (Acting President, Jan.–April 2003) Richard A. Meserve, 2003–2014 Former Trustees Philip H. Abelson, 1978–2004 Patrick E. -
Eminescu and the Transition to Peak-Ring Basins on Mercury
41st Lunar and Planetary Science Conference (2010) 1263.pdf EMINESCU AND THE TRANSITION TO PEAK-RING BASINS ON MERCURY. S. C. Schon,1 J. W. Head,1 L. M. Prockter2, and the MESSENGER Science Team.3 1Dept. of Geological Sciences, Brown University, Providence, RI 02906 USA; 2JHU/APL, Laurel, MD; 3http://messenger.jhuapl.edu/who_we_are/science_team.html. Introduction: The MESSENGER [1] flybys have yielded a range of new scientific findings for Mercury [2] including evidence of embayment relationships indicative of volcanic plains activity [3,4] and an im- proved size estimate for the Caloris basin [5]. These new data reveal a broad continuum of Mercurian crater morphologies [6] in greater detail than prior studies that relied on Mariner 10 or Earth-based radar observa- tions [7]. This study focuses on mapping the interior deposits of Eminescu, a central peak-ring basin, and is part of a larger comparative analysis of transitional crater morphologies observed on Mercury and the Moon in new data sets [8]. Impacts on Mercury occur at much higher veloci- ties than lunar impacts and correspondingly generate more impact melt. Cintala [9] estimated that for a given projectile, the velocity difference will lead to twice as much impact melt on Mercury than on the Moon. Here we examine images at ~150 m/pixel reso- Figure 1: Eminescu Crater, ~125-km in diameter (10.8°N, lution of the fresh impact crater Eminescu to document 114.1°E), imaged during the first MESSENGER flyby. the nature of fresh crater interiors on Mercury at the transition from complex to peak-ring morphology. -
Mercury's Low-Reflectance Material: Constraints from Hollows
Mercury’s low-reflectance material: Constraints from hollows Rebecca Thomas, Brian Hynek, David Rothery, Susan Conway To cite this version: Rebecca Thomas, Brian Hynek, David Rothery, Susan Conway. Mercury’s low-reflectance material: Constraints from hollows. Icarus, Elsevier, 2016, 277, pp.455-465. 10.1016/j.icarus.2016.05.036. hal-02271739 HAL Id: hal-02271739 https://hal.archives-ouvertes.fr/hal-02271739 Submitted on 27 Aug 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Accepted Manuscript Mercury’s Low-Reflectance Material: Constraints from Hollows Rebecca J. Thomas , Brian M. Hynek , David A. Rothery , Susan J. Conway PII: S0019-1035(16)30246-9 DOI: 10.1016/j.icarus.2016.05.036 Reference: YICAR 12084 To appear in: Icarus Received date: 23 February 2016 Revised date: 9 May 2016 Accepted date: 24 May 2016 Please cite this article as: Rebecca J. Thomas , Brian M. Hynek , David A. Rothery , Susan J. Conway , Mercury’s Low-Reflectance Material: Constraints from Hollows, Icarus (2016), doi: 10.1016/j.icarus.2016.05.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. -
Stellar Tidal Streams As Cosmological Diagnostics: Comparing Data and Simulations at Low Galactic Scales
RUPRECHT-KARLS-UNIVERSITÄT HEIDELBERG DOCTORAL THESIS Stellar Tidal Streams as Cosmological Diagnostics: Comparing data and simulations at low galactic scales Author: Referees: Gustavo MORALES Prof. Dr. Eva K. GREBEL Prof. Dr. Volker SPRINGEL Astronomisches Rechen-Institut Heidelberg Graduate School of Fundamental Physics Department of Physics and Astronomy 14th May, 2018 ii DISSERTATION submitted to the Combined Faculties of the Natural Sciences and Mathematics of the Ruperto-Carola-University of Heidelberg, Germany for the degree of DOCTOR OF NATURAL SCIENCES Put forward by GUSTAVO MORALES born in Copiapo ORAL EXAMINATION ON JULY 26, 2018 iii Stellar Tidal Streams as Cosmological Diagnostics: Comparing data and simulations at low galactic scales Referees: Prof. Dr. Eva K. GREBEL Prof. Dr. Volker SPRINGEL iv NOTE: Some parts of the written contents of this thesis have been adapted from a paper submitted as a co-authored scientific publication to the Astronomy & Astrophysics Journal: Morales et al. (2018). v NOTE: Some parts of this thesis have been adapted from a paper accepted for publi- cation in the Astronomy & Astrophysics Journal: Morales, G. et al. (2018). “Systematic search for tidal features around nearby galaxies: I. Enhanced SDSS imaging of the Local Volume". arXiv:1804.03330. DOI: 10.1051/0004-6361/201732271 vii Abstract In hierarchical models of galaxy formation, stellar tidal streams are expected around most galaxies. Although these features may provide useful diagnostics of the LCDM model, their observational properties remain poorly constrained. Statistical analysis of the counts and properties of such features is of interest for a direct comparison against results from numeri- cal simulations. In this work, we aim to study systematically the frequency of occurrence and other observational properties of tidal features around nearby galaxies. -
Chemo-Kinematics of the Milky Way from the SDSS-III MARVELS Survey
MNRAS 000,1–22 (2018) Preprint 6 October 2020 Compiled using MNRAS LATEX style file v3.0 Chemo-kinematics of the Milky Way from the SDSS-III MARVELS Survey Nolan Grieves,1¢ Jian Ge,1 Neil Thomas,2 Kevin Willis,1 Bo Ma,1 Diego Lorenzo-Oliveira,3,4 A. B. A. Queiroz,5,4 Luan Ghezzi,6 Cristina Chiappini,7,4 Friedrich Anders,7,4 Letícia Dutra-Ferreira,5,4 Gustavo F. Porto de Mello,8,4 Basílio X. Santiago,5,4 Luiz N. da Costa,6,4 Ricardo L. C. Ogando,6,4 E. F. del Peloso,4 Jonathan C. Tan,9,1 Donald P. Schneider,10,11 Joshua Pepper,12 Keivan G. Stassun,13 Bo Zhao,1 Dmitry Bizyaev,14,15 and Kaike Pan14 1Department of Astronomy, University of Florida, Gainesville, FL 32611, USA 2Department of Astronautical Engineering, United States Air Force Academy, CO 80840, USA 3Universidade de São Paulo, Departamento de Astronomia IAG/USP, Rua do Matão 1226, Cidade Universitária, São Paulo, SP 05508-900, Brazil 4Laboratório Interinstitucional de e-Astronomia-LIneA, Rua Gereral José Cristino 77, São Cristóvão, Rio de Janeiro, RJ 20921-400, Brazil 5Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051,Porto Alegre, RS - 91501-970, Brazil 6Observatório Nacional, Rua General José Cristino 77, São Cristóvão, Rio de Janeiro, RJ 20921-400, Brazil 7Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany 8Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antônio 43, Rio de Janeiro, RJ 20080-090, Brazil 9Department of Astronomy, University of Virginia, Charlottesville, VA 22904 10Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 11Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, University Park, PA 16802 12Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA, 18015, USA 13Vanderbilt University, Physics & Astronomy Department, 6301 Stevenson Center Ln., Nashville, TN 37235 14Apache Point Observatory and New Mexico State University, P.O. -
Asilomar Conference on Laboratory Precautions When Conducting Recombinant DNA Research – Case Summary M.J
International Dimensions of Ethics Education in Science and Engineering Case Study Series Asilomar Conference on Laboratory Precautions When Conducting Recombinant DNA Research – Case Summary M.J. Peterson with research assistance from Paul White Version 1, June 2010 Safe laboratory practices are an important element in the responsible conduct of research. They protect scientists, research assistants, laboratory technicians, and others from hazards that can arise during experimentation. The particular hazards that might arise vary according to the type of experimentation: the explosions or toxic gases that could result from chemical experiments are prevented or contained by different kinds of measures then are used to limit the health hazards posed by working with radioactive isotopes. In most areas, scientists are allowed – and even encouraged – to decide for themselves what experiments to undertake and how to construct and run their labs. In 1970, there were three main exceptions, and they applied more to questions of how to carry out research than to selecting topics for research: use of radioactive materials, use of tumor-causing viruses, and use of human subjects. In these areas, levels of risk to persons inside and outside the lab were perceived as great enough to justify having the government, either through the regular bureaucracy or through scientific agencies, set and enforce mandatory safety standards. When genetics was poised at the threshold of recombinant DNA research and genetic manipulation techniques in the 1960s, the hazards such work might pose to lab personnel or to others were unknown. Many scientists and others believed they were likely to be significant. The primary concern in public discussion was whether hybrid organisms bred from recombinant DNA would cause new diseases or create varieties of plants or animals that would overwhelm and irretrievably change the natural environment. -
Table of Contents
AAS Newsletter September/October 2012, Issue 166 - Published for the Members of the American Astronomical Society Table of Contents 2 President’s Column 17 Committee on the Status of Women in 4 From the Executive Office Astronomy 5 What Makes an Astronomy Story 18 News from NSF Division of Astronomical Newsworthy? Sciences (AST) 6 Journals Update 20 JWST Update 9 Secretary's Corner 21 HAD News 9 Council Actions 21 Honored Elsewhere 10 The AAS Heeds the Call of the Wild 22 Announcements 16 Committee on Employment 23 Calendar of Events 25 Washington News A A S American Astronomical Society AAS Officers President's Column David J. Helfand, President Debra M. Elmegreen, Past President David J. Helfand, [email protected] Nicholas B. Suntzeff, Vice-President Edward B. Churchwell, Vice-President Paula Szkody, Vice-President Hervey (Peter) Stockman, Treasurer G. Fritz Benedict, Secretary Anne P. Cowley, Publications Board Chair Edward E. Prather, Education Officer At 1:32AM Eastern time on 6 Councilors August, the Mars Science Laboratory Bruce Balick Nancy S. Brickhouse and its charmingly named rover, Eileen D. Friel Curiosity, executed a perfect landing Edward F. Guinan Todd J. Henry in Gale Crater. President Obama Steven D. Kawaler called the highly complex landing Patricia Knezek Robert Mathieu procedure “an unprecedented feat of Angela Speck technology that will stand as a point Executive Office Staff of pride far into the future.” While Kevin B. Marvel, Executive Officer we certainly hope Curiosity’s lifetime Tracy Beale, Registrar & Meeting Coordinator Chris Biemesderfer, Director of Publishing on Mars is a long one, we must all Sherri Brown, Membership Services continue to make the case that we Coordinator Kelly E. -
Introduction
Introduction ”They say the sky is the limit, but to me, it is only the beginning. I look to the stars, and I count them, imagining every one of them as the centre of a solar system, even more wondrous than our own. We now know they are out there. Planets. Millions of them - just waiting to be discovered. What are they like, these distant spinning worlds? How did they come to be? And finally - before I close my eyes and go to sleep, one question lingers. Like the echo of a whisper : Is anyone out there...” The study of exoplanets is a quest to understand our place in the universe. How unique is the solar system? How extraordinary is the Earth? Is life on Earth an unfathomable coincidence, or is the galaxy teeming with life? Only 25 years ago the first extrasolar planets were discovered, two of them, orbiting the millisecond pulsar PSR1257+12 (Wolszczan and Frail, 1992), and this was followed three years later by the discovery of the first exoplanet orbiting a solar-type star (51 Pegasi, Mayor and Queloz, 1995). In the subsequent years, multiple techniques were developed to find and study these new worlds. Each detection method has its own advantages, limitations and biases, and they have complimented each other to form the picture of exoplanets that we have today: The galaxy is brimming with planetary systems, and the exoplanets are more diverse, than we could ever have imagined. The diversity of planets presents a challenge to the theories of formation designed to match the solar system, and any modern theories must strive to explain the full observed range of architectures of planetary systems. -
A Basic Requirement for Studying the Heavens Is Determining Where In
Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short). -
Astronomy 2008 Index
Astronomy Magazine Article Title Index 10 rising stars of astronomy, 8:60–8:63 1.5 million galaxies revealed, 3:41–3:43 185 million years before the dinosaurs’ demise, did an asteroid nearly end life on Earth?, 4:34–4:39 A Aligned aurorae, 8:27 All about the Veil Nebula, 6:56–6:61 Amateur astronomy’s greatest generation, 8:68–8:71 Amateurs see fireballs from U.S. satellite kill, 7:24 Another Earth, 6:13 Another super-Earth discovered, 9:21 Antares gang, The, 7:18 Antimatter traced, 5:23 Are big-planet systems uncommon?, 10:23 Are super-sized Earths the new frontier?, 11:26–11:31 Are these space rocks from Mercury?, 11:32–11:37 Are we done yet?, 4:14 Are we looking for life in the right places?, 7:28–7:33 Ask the aliens, 3:12 Asteroid sleuths find the dino killer, 1:20 Astro-humiliation, 10:14 Astroimaging over ancient Greece, 12:64–12:69 Astronaut rescue rocket revs up, 11:22 Astronomers spy a giant particle accelerator in the sky, 5:21 Astronomers unearth a star’s death secrets, 10:18 Astronomers witness alien star flip-out, 6:27 Astronomy magazine’s first 35 years, 8:supplement Astronomy’s guide to Go-to telescopes, 10:supplement Auroral storm trigger confirmed, 11:18 B Backstage at Astronomy, 8:76–8:82 Basking in the Sun, 5:16 Biggest planet’s 5 deepest mysteries, The, 1:38–1:43 Binary pulsar test affirms relativity, 10:21 Binocular Telescope snaps first image, 6:21 Black hole sets a record, 2:20 Black holes wind up galaxy arms, 9:19 Brightest starburst galaxy discovered, 12:23 C Calling all space probes, 10:64–10:65 Calling on Cassiopeia, 11:76 Canada to launch new asteroid hunter, 11:19 Canada’s handy robot, 1:24 Cannibal next door, The, 3:38 Capture images of our local star, 4:66–4:67 Cassini confirms Titan lakes, 12:27 Cassini scopes Saturn’s two-toned moon, 1:25 Cassini “tastes” Enceladus’ plumes, 7:26 Cepheus’ fall delights, 10:85 Choose the dome that’s right for you, 5:70–5:71 Clearing the air about seeing vs. -
Impact Melt Emplacement on Mercury
Western University Scholarship@Western Electronic Thesis and Dissertation Repository 7-24-2018 2:00 PM Impact Melt Emplacement on Mercury Jeffrey Daniels The University of Western Ontario Supervisor Neish, Catherine D. The University of Western Ontario Graduate Program in Geology A thesis submitted in partial fulfillment of the equirr ements for the degree in Master of Science © Jeffrey Daniels 2018 Follow this and additional works at: https://ir.lib.uwo.ca/etd Part of the Geology Commons, Physical Processes Commons, and the The Sun and the Solar System Commons Recommended Citation Daniels, Jeffrey, "Impact Melt Emplacement on Mercury" (2018). Electronic Thesis and Dissertation Repository. 5657. https://ir.lib.uwo.ca/etd/5657 This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of Scholarship@Western. For more information, please contact [email protected]. Abstract Impact cratering is an abrupt, spectacular process that occurs on any world with a solid surface. On Earth, these craters are easily eroded or destroyed through endogenic processes. The Moon and Mercury, however, lack a significant atmosphere, meaning craters on these worlds remain intact longer, geologically. In this thesis, remote-sensing techniques were used to investigate impact melt emplacement about Mercury’s fresh, complex craters. For complex lunar craters, impact melt is preferentially ejected from the lowest rim elevation, implying topographic control. On Venus, impact melt is preferentially ejected downrange from the impact site, implying impactor-direction control. Mercury, despite its heavily-cratered surface, trends more like Venus than like the Moon.