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Lunar Impact Crater Identification and Age Estimation with Chang’E
ARTICLE https://doi.org/10.1038/s41467-020-20215-y OPEN Lunar impact crater identification and age estimation with Chang’E data by deep and transfer learning ✉ Chen Yang 1,2 , Haishi Zhao 3, Lorenzo Bruzzone4, Jon Atli Benediktsson 5, Yanchun Liang3, Bin Liu 2, ✉ ✉ Xingguo Zeng 2, Renchu Guan 3 , Chunlai Li 2 & Ziyuan Ouyang1,2 1234567890():,; Impact craters, which can be considered the lunar equivalent of fossils, are the most dominant lunar surface features and record the history of the Solar System. We address the problem of automatic crater detection and age estimation. From initially small numbers of recognized craters and dated craters, i.e., 7895 and 1411, respectively, we progressively identify new craters and estimate their ages with Chang’E data and stratigraphic information by transfer learning using deep neural networks. This results in the identification of 109,956 new craters, which is more than a dozen times greater than the initial number of recognized craters. The formation systems of 18,996 newly detected craters larger than 8 km are esti- mated. Here, a new lunar crater database for the mid- and low-latitude regions of the Moon is derived and distributed to the planetary community together with the related data analysis. 1 College of Earth Sciences, Jilin University, 130061 Changchun, China. 2 Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, 100101 Beijing, China. 3 Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education, College of Computer Science and Technology, Jilin University, 130012 Changchun, China. 4 Department of Information Engineering and Computer ✉ Science, University of Trento, I-38122 Trento, Italy. -
No. 40. the System of Lunar Craters, Quadrant Ii Alice P
NO. 40. THE SYSTEM OF LUNAR CRATERS, QUADRANT II by D. W. G. ARTHUR, ALICE P. AGNIERAY, RUTH A. HORVATH ,tl l C.A. WOOD AND C. R. CHAPMAN \_9 (_ /_) March 14, 1964 ABSTRACT The designation, diameter, position, central-peak information, and state of completeness arc listed for each discernible crater in the second lunar quadrant with a diameter exceeding 3.5 km. The catalog contains more than 2,000 items and is illustrated by a map in 11 sections. his Communication is the second part of The However, since we also have suppressed many Greek System of Lunar Craters, which is a catalog in letters used by these authorities, there was need for four parts of all craters recognizable with reasonable some care in the incorporation of new letters to certainty on photographs and having diameters avoid confusion. Accordingly, the Greek letters greater than 3.5 kilometers. Thus it is a continua- added by us are always different from those that tion of Comm. LPL No. 30 of September 1963. The have been suppressed. Observers who wish may use format is the same except for some minor changes the omitted symbols of Blagg and Miiller without to improve clarity and legibility. The information in fear of ambiguity. the text of Comm. LPL No. 30 therefore applies to The photographic coverage of the second quad- this Communication also. rant is by no means uniform in quality, and certain Some of the minor changes mentioned above phases are not well represented. Thus for small cra- have been introduced because of the particular ters in certain longitudes there are no good determi- nature of the second lunar quadrant, most of which nations of the diameters, and our values are little is covered by the dark areas Mare Imbrium and better than rough estimates. -
PDF of Manuscript and Figures
The triple origin of whales DAVID PETERS Independent Researcher 311 Collinsville Avenue, Collinsville, IL 62234, USA [email protected] 314-323-7776 July 13, 2018 RH: PETERS—TRIPLE ORIGIN OF WHALES Keywords: Cetacea, Mysticeti, Odontoceti, Phylogenetic analyis ABSTRACT—Workers presume the traditional whale clade, Cetacea, is monophyletic when they support a hypothesis of relationships for baleen whales (Mysticeti) rooted on stem members of the toothed whale clade (Odontoceti). Here a wider gamut phylogenetic analysis recovers Archaeoceti + Odontoceti far apart from Mysticeti and right whales apart from other mysticetes. The three whale clades had semi-aquatic ancestors with four limbs. The clade Odontoceti arises from a lineage that includes archaeocetids, pakicetids, tenrecs, elephant shrews and anagalids: all predators. The clade Mysticeti arises from a lineage that includes desmostylians, anthracobunids, cambaytheres, hippos and mesonychids: none predators. Right whales are derived from a sister to Desmostylus. Other mysticetes arise from a sister to the RBCM specimen attributed to Behemotops. Basal mysticetes include Caperea (for right whales) and Miocaperea (for all other mysticetes). Cetotheres are not related to aetiocetids. Whales and hippos are not related to artiodactyls. Rather the artiodactyl-type ankle found in basal archaeocetes is also found in the tenrec/odontocete clade. Former mesonychids, Sinonyx and Andrewsarchus, nest close to tenrecs. These are novel observations and hypotheses of mammal interrelationships based on morphology and a wide gamut taxon list that includes relevant taxa that prior studies ignored. Here some taxa are tested together for the first time, so they nest together for the first time. INTRODUCTION Marx and Fordyce (2015) reported the genesis of the baleen whale clade (Mysticeti) extended back to Zygorhiza, Physeter and other toothed whales (Archaeoceti + Odontoceti). -
Thewissen Et Al. Reply Replying To: J
NATURE | Vol 458 | 19 March 2009 BRIEF COMMUNICATIONS ARISING Hippopotamus and whale phylogeny Arising from: J. G. M. Thewissen, L. N. Cooper, M. T. Clementz, S. Bajpai & B. N. Tiwari Nature 450, 1190–1194 (2007) Thewissen etal.1 describe new fossils from India that apparentlysupport fossils, Raoellidae or the raoellid Indohyus is more closely related to a phylogeny that places Cetacea (that is, whales, dolphins, porpoises) as Cetacea than is Hippopotamidae (Fig. 1). Hippopotamidae is the the sister group to the extinct family Raoellidae, and Hippopotamidae exclusive sister group to Cetacea plus Raoellidae in the analysis that as more closely related to pigs and peccaries (that is, Suina) than to down-weights homoplastic characters, althoughin the equallyweighted cetaceans. However, our reanalysis of a modified version of the data set analysis, another topology was equally parsimonious. In that topology, they used2 differs in retaining molecular characters and demonstrates Hippopotamidae moved one node out, being the sister group to an that Hippopotamidae is the closest extant family to Cetacea and that Andrewsarchus, Raoellidae and Cetacea clade. In neither analysis is raoellids are the closest extinct group, consistent with previous phylo- Hippopotamidae closer to the pigs and peccaries than to Cetacea, the genetic studies2,3. This topology supports the view that the aquatic result obtained by Thewissen et al.1. In all our analyses, pachyostosis adaptations in hippopotamids and cetaceans are inherited from their (thickening) of limb bones and bottom walking, which occur in hippo- common ancestor4. potamids9,10, are interpreted to have evolved before the pachyostosis of To conduct our analyses, we started with the same published matrix the auditory bulla, as seen in raoellids and cetaceans1. -
Secondary Craters on Europa and Implications for Cratered Surfaces
Vol 437|20 October 2005|doi:10.1038/nature04069 LETTERS Secondary craters on Europa and implications for cratered surfaces Edward B. Bierhaus1, Clark R. Chapman2 & William J. Merline2 For several decades, most planetary researchers have regarded the craters were typically not spatially random, but instead appeared in impact crater populations on solid-surfaced planets and smaller clumps and clusters16 even at distances far (several hundred kilo- bodies as predominantly reflecting the direct (‘primary’) impacts metres) from the nearest large primary crater. This clustered spatial of asteroids and comets1. Estimates of the relative and absolute distribution contrasts with primary impacts, which are spatially ages of geological units on these objects have been based on this random. The low spatial density and unusual non-random spatial assumption2. Here we present an analysis of the comparatively distribution of Europa’s small craters enabled us to achieve what has sparse crater population on Jupiter’s icy moon Europa and suggest been previously difficult, namely unambiguous identification and that this assumption is incorrect for small craters. We find that quantification of the contribution of distant secondary craters to the ‘secondaries’ (craters formed by material ejected from large total crater SFD. This, in turn, allows us to re-examine the overall primary impact craters) comprise about 95 per cent of the small crater age-dating methodology. We discuss the specifics of the craters (diameters less than 1 km) on Europa. We therefore con- Europa data first. clude that large primary impacts into a solid surface (for example, We measured more than 17,000 craters in 87 low-compression, ice or rock) produce far more secondaries than previously low-sun, high-resolution Europa images (scales ,60 m pixel21), believed, implying that the small crater populations on the which cover nine regions totalling 0.2% of Europa’s surface (a much Moon, Mars and other large bodies must be dominated by larger percentage of Europa has been imaged at lower resolutions), secondaries. -
Member Magazine Summer 2013 Vol. 38 No. 3 2 News at the Museum 3
Member Magazine Summer 2013 Vol. 38 No. 3 2 News at the Museum 3 From the For many people, summer means vacations cultural points of view, presenting the roles, both Ancient Mariners: New Initiative Makes and precious time away from professional positive and negative, that poison has played and President responsibilities. At the Museum, summer continues to play in nature and human history. At Rare Display of Trilobites Membership Card Count is a time of tremendous activity! the same time, scientists, computer engineers, and Ellen V. Futter Field season kicks into high gear and many visualization experts in the Rose Center for Earth The Museum’s Grand Gallery recently became home to a remarkable case of of our scientists head to locations around the and Space are putting the finishing touches on trilobites. Called “butterflies of the sea,” “frozen locusts,” or simply “bugs” by world to further their research. Of course, field a thrilling new Hayden Planetarium Space Show, the researchers who study them, these ancient arthropods are distant relatives expeditions are a long-standing tradition at the which will reveal dramatic recent discoveries in of modern lobsters, horseshoe crabs, and spiders. Museum—part of our DNA, if you will. Museum the fast-moving field of astrophysics and forecast The temporary exhibition, overseen by Neil Landman, curator in the scientists now undertake some 120 expeditions what’s in store in cosmology in the years ahead. Museum’s Division of Paleontology, includes 15 fossils of various trilobite species each year, and that work advances not only The Space Show will premiere on October 5 and from the Museum’s permanent collection. -
History of Earth
History of Earth The history of Earth concerns the development of planet Earth from its formation to the present day.[1][2] Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution. The geological time scale (GTS), as defined by international convention,[3] depicts the large spans of time from the beginning of the Earth to the present, and its divisions chronicle some definitive events of Earth history. (In the graphic: Ga means "billion years ago"; Ma, "million years ago".) Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.[4][5][6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen. Much of the Earth was molten because of frequent collisions with other bodies which led to extreme volcanism. While the Earth was in its earliest stage (Early Earth), a giant impact collision with a planet-sized body named Theia is thought to have formed the Moon. Over time, the Earth cooled, causing the formation of a solid crust, and allowing liquid water on the surface. The Hadean eon represents the time before a reliable (fossil) record of life; it began with the formation of the planet and ended 4.0 billion years ago. The following Archean and Proterozoic eons produced the beginnings of life on Earth and its earliest evolution. The succeeding eon is the Phanerozoic, divided into three eras: the Palaeozoic, an era of arthropods, fishes, and the first life on land; the Mesozoic, which spanned the rise, reign, and climactic extinction of the non-avian dinosaurs; and the Cenozoic, which saw the rise of mammals. -
1946 ~ Former Ref: Second Series M
University Museums and Special Collections Service MAC C C C., H.S. ~ 1878 ~ former ref: 6/60 MAC C&A C&A C. & A. Trading Agencies ~ 1946 ~ former ref: Second series MAC CAB CAB Cabahe, Michael ~ 1909 ~ former ref: 52/58 Caball, John ~ 1953 ~ former ref: Second series Cabaud, Jacques M. ~ 1957 ~ former ref: Second series Cabaut & Cia ~ 1907 ~ former ref: 57/162 Cabaut & Cia ~ 1907 ~ former ref: 203/245 Cabbon, James ~ 1900 ~ former ref: 23/88 Cabburn, John ~ 1945 ~ former ref: Second series University Museums and Special Collections Service Cabell, H.F. ~ 1961 ~ former ref: Second series Cabell, Harold F. ~ 1915 ~ former ref: 69/213 Cabell, William L. ~ 1855 ~ former ref: 224/28 Cable and Wireless Limited ~ 1946, 1956 ~ former ref: Second series Cable, George C. ~ 1947, 1951 ~ former ref: Second series Cable, Herbert ~ 1942 ~ former ref: Second series Cable, John A. ~ 1958 ~ former ref: Second series Cable, Lindsay W. ~ 1942 ~ former ref: Second series Cabran, Auguste ~ 1925 ~ former ref: 88/110 MAC CAC CAC Cachia, Frank ~ 1933 ~ former ref: 152/141 Cacoulides, Libraire C. ~ 1948-61 ~ Booksellers Re: A Greek edition of Composition Excercises in Everyday English by AS Hornby [qv] ~ former ref: Second series University Museums and Special Collections Service MAC CAD CAD Cadbury Bros. Ltd. ~ 1946-62 ~ Chocolate manufacturers Re: The supply of illustrative material for Macmillan titles including The Co-operative Movement at Home and Overseas by Spaull and Kay; Living in Communities Bk II and History Class Pictures; also a request to Macmillan from Cadbu ~ former ref: Second series Cadbury, Geraldine S. ~ 1937 ~ former ref: 179/137 Cadbury, Henry J. -
Resolving the Relationships of Paleocene Placental Mammals
Biol. Rev. (2015), pp. 000–000. 1 doi: 10.1111/brv.12242 Resolving the relationships of Paleocene placental mammals Thomas J. D. Halliday1,2,∗, Paul Upchurch1 and Anjali Goswami1,2 1Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, U.K. 2Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, U.K. ABSTRACT The ‘Age of Mammals’ began in the Paleocene epoch, the 10 million year interval immediately following the Cretaceous–Palaeogene mass extinction. The apparently rapid shift in mammalian ecomorphs from small, largely insectivorous forms to many small-to-large-bodied, diverse taxa has driven a hypothesis that the end-Cretaceous heralded an adaptive radiation in placental mammal evolution. However, the affinities of most Paleocene mammals have remained unresolved, despite significant advances in understanding the relationships of the extant orders, hindering efforts to reconstruct robustly the origin and early evolution of placental mammals. Here we present the largest cladistic analysis of Paleocene placentals to date, from a data matrix including 177 taxa (130 of which are Palaeogene) and 680 morphological characters. We improve the resolution of the relationships of several enigmatic Paleocene clades, including families of ‘condylarths’. Protungulatum is resolved as a stem eutherian, meaning that no crown-placental mammal unambiguously pre-dates the Cretaceous–Palaeogene boundary. Our results support an Atlantogenata–Boreoeutheria split at the root of crown Placentalia, the presence of phenacodontids as closest relatives of Perissodactyla, the validity of Euungulata, and the placement of Arctocyonidae close to Carnivora. Periptychidae and Pantodonta are resolved as sister taxa, Leptictida and Cimolestidae are found to be stem eutherians, and Hyopsodontidae is highly polyphyletic. -
WILKINSON COLLEGE of Arts, Humanities, and Social Sciences
2014 – 2015 WILKINSON COLLEGE of Arts, Humanities, and Social Sciences ANNUAL REPORT 2 Table of Contents Opening Statement ..........................................................................................................................................2-3 International Reach ........................................................................................................................................ 4-5 CRASsH and BURN .......................................................................................................................................6-7 Collections in Wilkinson ..................................................................................................................................8 Creative Industries .............................................................................................................................................9 Arts and Humanities................ ...................................................................................................................10-25 Art ....................................................................................................................................................10-11 English .............................................................................................................................................12-13 World Languages & Cultures .......................................................................................................14-15 Religious Studies ............................................................................................................................16-17 -
Board Certified Fellows
AMERICAN BOARD OF MEDICOLEGAL DEATH INVESTIGATORS Certificant Directory As of September 30, 2021 BOARD CERTIFIED FELLOWS Addison, Krysten Leigh (Inactive) BC2286 Allmon, James L. BC855 Travis County Medical Examiner's Office Sangamon County Coroner's Office 1213 Sabine Street 200 South 9th, Room 203 PO Box 1748 Springfield, IL 62701 Austin, TX 78767 Amini, Navid BC2281 Appleberry, Sherronda BC1721 Olmsted Medical Examiner's Office Adams and Broomfield County Office of the Coroner 200 1st Street Southwest 330 North 19th Avenue Rochester, MN 55905 Brighton, CO 80601 Applegate, MD, David T. BC1829 Archer, Meredith D. BC1036 Union County Coroner's Office Mohave County Medical Examiner 128 South Main Street 1145 Aviation Drive Unit A Marysville, OH 43040 Lake Havasu, AZ 86404 Bailey, Ted E. (Inactive) BC229 Bailey, Sanisha Renee BC1754 Gwinnett County Medical Examiner's Office Virginia Office of the Chief Medical Examiner 320 Hurricane Shoals Road, NE Central District Lawrenceville, GA 30046 400 East Jackson Street Richmond, VA 23219 Balacki, Alexander J BC1513 Banks, Elsie-Kay BC3039 Montgomery County Coroner's Office Maine Office of the Chief Medical Examiner 1430 Dekalb Street 30 Hospital Street PO Box 311 Augusta, ME 04333 Norristown, PA 19404 Bautista, Ian BC2185 Bayer, Lindsey A. BC875 New York City Office of Chief Medical Examiner District 5 and 24 Medical Examiner Office 421 East 26th Street 809 Pine Street New York, NY 10016 Leesburg, FL 34756 Beck, Shari L BC327 Beckham, Phinon Phillips BC2305 Sedgwick Co Reg. Forensic Science Center Virginia Office of the Chief Medical Examiner 1109 N. Minneapolis Northern District Wichita, KS 67214 10850 Pyramid Place, Suite 121 Manassas, VA 20110 Bednar Keefe, Gale M. -
Issue 112, November 2007
Return to the Moon: A New Perspective RETURN TO THE MOON: A NEW PERSPECTIVE Sometimes history does repeat itself. Just as 40 years ago as the United States prepared to land the fi rst humans on the Moon, several nations are now beginning their own precursor robotic exploration of the Moon with an eye to the future. Japan and China have both launched advanced orbital mapping missions to the Moon in the past three months, with India and the United States to follow in 2008. Both Asian missions are successfully in orbit and conducting instrument checkouts and calibrations before full-scale mapping begins. They bring a wide variety of scientifi c investigations across a broad reach of the electromagnetic spectrum to bear on our nearest neighbor, hoping to unlock its secrets. At stake are knowledge of lunar resources, including whether ice exists at the poles, and a clearer understanding of the origins and earliest history of the Moon. The United States has a strong interest in returning to the Moon with astronauts, and the fl eet of orbiting robots, including Lunar Reconaissance Orbiter to launch next summer, will aid in guiding those explorers to the right location. To further aid those who are planning those future expeditions, several groups are digging into the old Apollo records, including planning charts, reports, and images. Many of these resources are now Lonline, including at the Lunar and Planetary Institute, available for all lunar afi cionados. The next decade promises to be an exciting one for lunar research. With the new missions underway, we feature in this issue several related reports on these new initiatives and the restoration of the historic records and archives.