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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. -
Thursday, April 03, 2014 the Winter 2014
The BYU-Idaho Research and Creative Works Council Is Pleased to Sponsor The Winter 2014 Thursday, April 03, 2014 Conference Staff Hayden Coombs Conference Manager Caroline Baker Conference Logistics Michael Stoll Faculty Support Meagan Pruden Faculty Support Cory Daley Faculty Support Blair Adams Graphic Design Kyle Whittle Assessment Jordan Hunter Assessment Jarek Smith Outreach Blaine Murray Outreach Advisory Committee Hector A. Becerril Conference Chair Jack Harrell Faculty Advisor Jason Hunt Faculty Advisor Tammy Collins Administrative Support Greg Roach Faculty Advisor Brian Schmidt Instructional Development Jared Williams Faculty Advisor Alan K. Young Administrative Support Brady Wiggins Faculty Advisor Lane Williams Faculty Advisor Agricultural and Biological Sciences Biological & Health Sciences, Oral Presentations SMI 240, 04:30 PM to 06:30 PM Comparison of Embryonic Development and the Association of Aeration on Rate of Growth in Pacific Northeastern Nudibranchs Elysa Curtis, Daniel Hope, Mackenzie Tietjen, Alan Holyoak (Mentor) Egg masses of six species of nudibranchs were kept and observed in a laboratory saltwater table with a constant flow of water directly from the ocean, from the time the eggs were laid to the time they hatched. The egg masses were kept in the same relative place in which they were laid, and protected by plastic containers with two mesh sides to let the water flow freely past the eggs. Samples of the egg masses were collected and observed under a microscope at regular intervals while temperature, salinity, width of eggs and stage of development were recorded. It was found that each embryo developed significantly faster compared to previous studies conducted on the respective species’ egg masses, including studies with higher water temperatures. -
Tweetstorming in the Language Classroom: Impact on EFL Tertiary Students’ Ideational Fluency and Syntactic Complexity
كلية التربية المجلة التربوية *** Tweetstorming in the Language Classroom: Impact on EFL Tertiary Students’ Ideational Fluency and Syntactic Complexity Abdullah Mahmoud Ismail Ammar Assistant Professor of TEFL Sohag Faculty of Education . اجمللة الرتبوية ـ العدد السادس واﻷربعون ـ أكتوبر 1026م ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ العدد )46( أكتوبر6106م ABSTRACT The last few years have witnessed a paradigm shift in educational settings where language educators and practitioners have turned their focus from traditional face-to-face classroom practices to more hybrid and virtual language teaching/learning methodologies. This paradigm shift gained momentum with the introduction of Web 2.00 tools and social media applications and the increased tendency in education and workplace towards more technology-driven practices and solutions. The current study reports on an experimental treatment to employ Tweetstorming in writing classes of tertiary students and studying the impact on their ideational fluency and syntactic complexity. Participants were EFL tertiary students enrolled in Writing I course of the English Study program of Abu Dhabi University. Results of the study indicate that using Tweetstorming in the writing classes of tertiary EFL students brought about significant gains in their ideational fluency and syntactic complexity. Details of the instructional -
A Little Birdie Told Me About Agriculture: Best Practices and Future Uses of Twitter in Agriculutral Communications
Journal of Applied Communications Volume 94 Issue 3 Nos. 3 & 4 Article 2 A Little Birdie Told Me About Agriculture: Best Practices and Future Uses of Twitter in Agriculutral Communications Katie Allen Katie Abrams Courtney Meyers See next page for additional authors Follow this and additional works at: https://newprairiepress.org/jac This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Recommended Citation Allen, Katie; Abrams, Katie; Meyers, Courtney; and Shultz, Alyx (2010) "A Little Birdie Told Me About Agriculture: Best Practices and Future Uses of Twitter in Agriculutral Communications," Journal of Applied Communications: Vol. 94: Iss. 3. https://doi.org/10.4148/1051-0834.1189 This Professional Development is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Journal of Applied Communications by an authorized administrator of New Prairie Press. For more information, please contact [email protected]. A Little Birdie Told Me About Agriculture: Best Practices and Future Uses of Twitter in Agriculutral Communications Abstract Social media sites, such as Twitter, are impacting the ways businesses, organizations, and individuals use technology to connect with their audiences. Twitter enables users to connect with others through 140-character messages called “tweets” that answer the question, “What’s happening?” Twitter use has increased exponentially to more than five million active users but has a dropout rate of more than 50%. Numerous agricultural organizations have embraced the use of Twitter to promote their products and agriculture as a whole and to interact with audiences in a new way. -
Twitter: a Uses and Gratifications Approach
University of Kentucky UKnowledge University of Kentucky Master's Theses Graduate School 2011 “WHAT’S HAPPENING” @TWITTER: A USES AND GRATIFICATIONS APPROACH Corey Leigh Ballard University of Kentucky, [email protected] Right click to open a feedback form in a new tab to let us know how this document benefits ou.y Recommended Citation Ballard, Corey Leigh, "“WHAT’S HAPPENING” @TWITTER: A USES AND GRATIFICATIONS APPROACH" (2011). University of Kentucky Master's Theses. 155. https://uknowledge.uky.edu/gradschool_theses/155 This Thesis is brought to you for free and open access by the Graduate School at UKnowledge. It has been accepted for inclusion in University of Kentucky Master's Theses by an authorized administrator of UKnowledge. For more information, please contact [email protected]. ABSTRACT OF THESIS “WHAT’S HAPPENING” @TWITTER: A USES AND GRATIFICATIONS APPROACH The uses and gratifications approach places power in the hands of the audience and is a helpful perspective when trying to understand media usage, exposure, and effects. However, while the uses and gratifications approach has been applied regularly to traditional media, research explaining why people use new social media networks as well as the gratifications they obtain from them is scarce at best. This thesis provides a comprehensive overview of the uses and gratifications approach as well as the current literature about social media networks. An argument is built within the thesis to study Twitter as one social media network through the uses and gratifications theoretical lens. Research questions are provided and a survey of 216 college undergraduates was conducted. Results show that people use a variety of Twitter functions, that the gratifications sought from Twitter are not the gratifications obtained from Twitter, and that people are careful about the types of information they share on the social media network. -
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. -
Twitter and Society
TWITTER AND SOCIETY Steve Jones General Editor Vol. 89 The Digital Formations series is part of the Peter Lang Media and Communication list. Every volume is peer reviewed and meets the highest quality standards for content and production. PETER LANG New York Washington, D.C./Baltimore Bern Frankfurt Berlin Brussels Vienna Oxford TWITTER AND SOCIETY Edited by Katrin Weller, Axel Bruns, Jean Burgess, Merja Mahrt, & Cornelius Puschmann PETER LANG New York Washington, D.C./Baltimore Bern Frankfurt Berlin Brussels Vienna Oxford Library of Congress Cataloging-in-Publication Data Twitter and society / edited by Katrin Weller, Axel Bruns, Jean Burgess, Merja Mahrt, Cornelius Puschmann. pages cm. ----- (Digital formations; vol. 89) Includes bibliographical references and index. 1. Twitter. 2. Online social networks. 3. Internet-----Social aspects. 4. Information society. I. Weller, Katrin, editor of compilation. HM743.T95T85 2 006.7’54-----dc23 2013018788 ISBN 978-1-4331-2170-8 (hardcover) ISBN 978-1-4331-2169-2 (paperback) ISBN 978-1-4539-1170-9 (e-book) ISSN 1526-3169 Bibliographic information published by Die Deutsche Nationalbibliothek. Die Deutsche Nationalbibliothek lists this publication in the ‘‘Deutsche Nationalbibliografie’’; detailed bibliographic data is available on the Internet at http://dnb.d-nb.de/. Cover art: Klee, Paul (1879---1940): Twittering Machine (Zwitscher-Maschine), 1922. New York, Museum of Modern Art (MoMA). Watercolor, and pen and ink on oil transfer drawing on paper, mounted on cardboard. DIGITAL IMAGE ©2012, The Museum of Modern Art/Scala, Florence. The paper in this book meets the guidelines for permanence and durability of the Committee on Production Guidelines for Book Longevity of the Council of Library Resources. -
Harmonic Dualism and the Origin of the Minor Triad
45 Harmonic Dualism and the Origin of the Minor Triad JOHN L. SNYDER "Harmonic Dualism" may be defined as a school of musical theoretical thought which holds that the minor triad has a natural origin different from that of the major triad, but of equal validity. Specifically, the term is associated with a group of nineteenth and early twentieth century theo rists, nearly all Germans, who believed that the minor harmony is constructed in a downward ("negative") fashion, while the major is an upward ("positive") construction. Al though some of these writers extended the dualistic approach to great lengths, applying it even to functional harmony, this article will be concerned primarily with the problem of the minor sonority, examining not only the premises and con clusions of the principal dualists, but also those of their followers and their critics. Prior to the rise of Romanticism, the minor triad had al ready been the subject of some theoretical speculation. Zarlino first considered the major and minor triads as en tities, finding them to be the result of harmonic and arith metic division of the fifth, respectively. Later, Giuseppe Tartini advanced his own novel explanation: he found that if one located a series of fundamentals such that a given pitch would appear successively as first, second, third •.• and sixth partial, the fundamentals of these harmonic series would outline a minor triad. l Tartini's discussion of combination tones is interesting in that, to put a root un der his minor triad outline, he proceeds as far as the 7:6 ratio, for the musical notation of which he had to invent a new accidental, the three-quarter-tone flat: IG. -
Understanding the Twitter Usage of Humanities and Social Sciences Academic Journals
Understanding the Twitter Usage of Humanities and Social Sciences Academic Journals Aravind Sesagiri Raamkumar Edie Rasmussen Nanyang Technological University, Singapore. University of British Columbia, Canada. [email protected] [email protected] Mojisola Erdt Yin-Leng Theng Nanyang Technological University, Singapore. Nanyang Technological University, Singapore. [email protected] [email protected] Harsha Vijayakumar Nanyang Technological University, Singapore. [email protected] ABSTRACT Scholarly communication has the scope to transcend the limitations of the physical world through social media’s extended coverage and shortened information paths. Accordingly, publishers have created profiles for their journals in Twitter to promote their publications and to initiate discussions with public. This paper investigates the Twitter presence of humanities and social sciences (HSS) journal titles obtained from mainstream citation indices, by analysing the interaction and communication pat- terns. This study utilizes webometric data collection, descriptive analysis, and social network analysis. Findings indicate that the presence of HSS journals in Twitter across disciplines is not yet substantial. Sharing of general websites appears to be the key activity performed by HSS journals in Twitter. Among them, web content from news portals and magazines are highly disseminated. Sharing of research articles and retweeting was not majorly observed. Inter-journal communication is apparent within the same citation index, but it is very minimal with journals from the other index. However, there seems to be an effort to broaden communication beyond the research community, reaching out to connect with the public. KEYWORDS Social media, twitter, microblogs, journals, social network analysis, humanities, social sciences. INTRODUCTION Twitter can be considered as one of the contemporary and popular online social networks. -
Multiphonics of the Grand Piano – Timbral Composition and Performance with Flageolets
Multiphonics of the Grand Piano – Timbral Composition and Performance with Flageolets Juhani VESIKKALA Written work, Composition MA Department of Classical Music Sibelius Academy / University of the Arts, Helsinki 2016 SIBELIUS-ACADEMY Abstract Kirjallinen työ Title Number of pages Multiphonics of the Grand Piano - Timbral Composition and Performance with Flageolets 86 + appendices Author(s) Term Juhani Topias VESIKKALA Spring 2016 Degree programme Study Line Sävellys ja musiikinteoria Department Klassisen musiikin osasto Abstract The aim of my study is to enable a broader knowledge and compositional use of the piano multiphonics in current music. This corpus of text will benefit pianists and composers alike, and it provides the answers to the questions "what is a piano multiphonic", "what does a multiphonic sound like," and "how to notate a multiphonic sound". New terminology will be defined and inaccuracies in existing terminology will be dealt with. The multiphonic "mode of playing" will be separated from "playing technique" and from flageolets. Moreover, multiphonics in the repertoire are compared from the aspects of composition and notation, and the portability of multiphonics to the sounds of other instruments or to other mobile playing modes of the manipulated grand piano are examined. Composers tend to use multiphonics in a different manner, making for differing notational choices. This study examines notational choices and proposes a notation suitable for most situations, and notates the most commonly produceable multiphonic chords. The existence of piano multiphonics will be verified mathematically, supported by acoustic recordings and camera measurements. In my work, the correspondence of FFT analysis and hearing will be touched on, and by virtue of audio excerpts I offer ways to improve as a listener of multiphonics. -
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