Download or read book MORPHOLOGIE ET DYNAMIQUE DES GALAXIES BARRES DE TYPE PRECOCE written by Hervé Wozniak and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LES BARRES STELLAIRES VISIBLES DANS PLUS D'UN TIERS DES GALAXIES A DISQUE POSENT DE NOMBREUX PROBLEMES, NOTAMMENT CONCERNANT LEUR STRUCTURE DYNAMIQUE. LEURS PROPRIETES GLOBALES, TELLES QUE LEUR LUMINOSITE, LEUR MASSE, ETC., SONT TRES MAL CONNUES CE QUI GENE CONSIDERABLEMENT LA CONSTRUCTION DE MODELES DYNAMIQUES REALISTES ET AUTO-CONSISTANTS. NOUS AVONS DONC PORTE NOTRE EFFORT SUR DES GALAXIES BARREES DE TYPE PRECOCE (CLASSEES SBO) DE FACON A N'ETUDIER QUE DES BARRES DEBARRASSEES DE STRUCTURES ACCOMPAGNATRICES TELS LES BRAS SPIRAUX, LES BANDES DE POUSSIERES, ETC. LA RELATIVE SIMPLICITE DE CES OBJETS (BULBE, BARRE, DISQUE) N'EMPECHE EN RIEN UNE GRANDE VARIETE MORPHOLOGIQUE. AUSSI, NOUS AVONS CONSTRUIT UN ECHANTILLON CONTENANT 17 GALAXIES DE TYPE SBO PARMI UN ENSEMBLE D'UNE TRENTAINE DE GALAXIES OBSERVEES AU 60 CM D'HAWAII PAR M.J. PIERCE (D.A.O.), AU 1.54 M DANOIS DE L'ESO PAR A. BOSMA (OBSERVATOIRE DE MARSEILLE) ET AU 120 CM DE L'OHP PAR NOUS-MEME. DANS UN PREMIER TEMPS, NOUS AVONS ETUDIE LA MORPHOLOGIE DES BARRES. LES ISOPHOTES DES BARRES AYANT UN ASPECT PLUS RECTANGULAIRE QU'ELLIPTIQUE, NOUS AVONS CHERCHE A CARACTERISER DE MANIERE OBJECTIVE L'ECART ENTRE L'ISOPHOTE REELLE ET L'ELLIPSE QU'ON LUI AJUSTE. POUR CELA, UN PARAMETRE DE FORME (C) A ETE INTRODUIT DANS L'EQUATION DE L'ELLIPSE AFIN D'AJUSTER DES FORMES ALLANT DU LOSANGE (C TENDANT VERS 1) AU RECTANGLE (C TENDANT VERS L'INFINI) EN PASSANT PAR L'ELLIPSE (C EGALE 2). IL A ETE AINSI MONTRE QUE LE PARAMETRE DE FORME ATTEINT UN MAXIMUM PRES DE LA FIN DE LA BARRE, CE MAXIMUM VALANT POUR NOTRE ECHANTILLON ENTRE 2,5 ET 5,5. APRES SOUSTRACTION DU BULBE, L'EXCENTRICITE DE LA BARRE DECROIT AVEC LE RAYON. SUR UN CINQUIEME DE LA LONGUEUR DE LA BARRE, L'EXCENTRICITE PEUT DECROITRE DE 0,7-0,9 A 0,5 VERS LA FIN DE LA BARRE. DES RESULTATS SIMILAIRES ONT ETE OBTENUS SUR DES BARRES ISSUES DE SIMULATIONS NUMERIQUES. CES ECARTS A L'ELLIPTICITE PRESENTS DANS LA DISTRIBUTION DE MASSE DOIVENT EVIDEMMENT AVOIR DES REPERCUSSIONS SUR LA DYNAMIQUE INTERNE DES ETOILES ET DU GAZ DE LA BARRE. TOUTEFOIS, JUSQU'A PRESENT, AUCUN MODELE N'A SERIEUSEMENT PRIS EN COMPTE L'ASPECT REEL DES BARRES, ADOPTANT GENERALEMENT UNE DISTRIBUTION ELLIPTIQUE DE MASSE (NOTAMMENT LES ELLIPSOIDES DE FERRERS) OU UNE EXPRESSION DU POTENTIEL NE CONTENANT QU'UNE PERTURBATION DE SYMETRIE D'ORDRE 2. AUSSI, PLUTOT QU'INTRODUIRE ARBITRAIREMENT UNE COMPOSANTE QUADRUPOLAIRE OU D'ORDRE SUPERIEURE DANS LE POTENTIEL, NOUS AVONS CHOISI DE MESURER DIRECTEMENT LES COMPOSANTES DE FOURIER DU POTENTIEL SUR DES IMAGES CORRIGEES DE L'INCLINAISON SUR LE PLAN DU CIEL. DANS LA MESURE OU, SELON DIFFERENTS ARGUMENTS INDEPENDANTS, LES BARRES SEMBLENT ETRE DES STRUCTURES DE FAIBLE EPAISSEUR, IL SUFFIT DE RESOUDRE L'EQUATION DE POISSON DANS LE PLAN DE L'IMAGE. LE RAPPORT MASSE-LUMINOSITE EST SUPPOSE CONSTANT DANS LE BULBE ET LA BARRE, CE QUI EST COMPATIBLE AVEC NOS MESURES DE GRADIENT D'INDICE DE COULEUR. LES POTENTIELS AINSI CALCULES ONT PERMIS DE METTRE EN EVIDENCE CERTAINES LACUNES DES MODELES TRADITIONNELS. ON RETROUVE EVIDEMMENT LE FAIT QUE LES MODELES NE PRENNENT PAS EN COMPTE LA RECTANGULARITE DE LA DISTRIBUTION DE MASSE. D'AUTRE PART, IL APPARAIT QUE LA VARIATION DE L'EXCENTRICITE DE LA BARRE JOUE UN ROLE TRES IMPORTANT QUI NE PEUT ETRE ENTIEREMENT REPRODUIT PAR DES MODELES A EXCENTRICITE CONSTANTE. PAR EXEMPLE, NOUS AVONS ESSAYE D'AJUSTER PAR UNE METHODE DE MOINDRES CARRES LE POTENTIEL D'UN ELLIPSOIDE DE FERRERS A CELUI CALCULE POUR NGC 936. IL S'AVERE QU'IL EST IMPOSSIBLE D'AJUSTER LES COMPOSANTES M=2 ET M=4 AVEC UN SEUL ET MEME MODELE. LE POTENTIEL DE L'UNE DES GALAXIES DE L'ECHANTILLON (NGC 936) A ETE ETUDIE PLUS EN DETAIL. LES EQUATIONS DU MOUVEMENT ONT ETE INTEGREES AFIN DE TROUVER LES FAMILLES D'ORBITES PERIODIQUES ET DE CONSTRUIRE DES DIAGRAMMES CARACTERISTIQUES. LA SERIE DE FOURIER DU POTENTIEL A ETE TRONQUEE AFIN D'ETUDIER LES CHANGEMENTS QU'INTRODUISENT CHACUNE DES COMPOSANTES. AINSI, TROIS CONFIGURATIONS DE POTENTIEL ONT ETE UTILISEES: UN POTENTIEL COMPOSE UNIQUEMENT DE LA PARTIE AXISYMETRIQUE (M=0), L'AJOUT DE LA COMPOSANTE M=2 ET ENFIN, L'ADDITION DE LA COMPOSANTE M=4. LES DIAGRAMMES CARACTERISTIQUES ONT ETE COMPLETES PAR DES SURFACES DE SECTIONS CALCULEES DANS LES MEMES CONFIGURATIONS AFIN D'EVALUER L'IMPORTANCE DES REGIONS DE L'ESPACE DES PHASES OCCUPEES PAR LES ORBITES PIEGEES, SEMI-ERGODIQUES OU ERGODIQUES. LES ORBITES PERIODIQUES CALCULEES MONTRENT QUE NI CELLES DE LA FAMILLE X1, NI CELLES DE LA FAMILLE 4/1, DEUX FAMILLES SUR LESQUELLES ON PEUT CONSTRUIRE LA FORME RECTANGULAIRE DE LA DENSITE DE MASSE DANS LES MODELES TRADITIONNELS, NE PEUVENT, DANS NOTRE CAS, CONTRIBUER AU SQUELETTE DE LA BARRE. EN EFFET, CES ORBITES SONT GENERALEMENT INSTABLES OU N'ONT PAS LA BONNE GEOMETRIE. AUSSI, AFIN DE REPRODUIRE LA FORME RECTANGULAIRE, IL SEMBLE NECESSAIRE D'INVOQUER SOIT LA SUPERPOSITION D'ORBITES ASYMETRIQUES DE LA FAMILLE 3/1, SOIT DES ORBITES SEMI-ERGODIQUES CONFINEES PAR UN CANTORI AUTOUR DE LA X1, SOIT DES OR
Download or read book Morphologie Et Dynamique Des Galaxies Barr es de Type Pr coce written by Hervé Wozniak and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Download or read book Montreal Metropolis 1880 1930 written by Centre canadien d'architecture and published by . This book was released on 1998 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Routledge International Handbook of Ignorance Studies written by Matthias Gross and published by Routledge. This book was released on 2015-05-15 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once treated as the absence of knowledge, ignorance today has become a highly influential topic in its own right, commanding growing attention across the natural and social sciences where a wide range of scholars have begun to explore the social life and political issues involved in the distribution and strategic use of not knowing. The field is growing fast and this handbook reflects this interdisciplinary field of study by drawing contributions from economics, sociology, history, philosophy, cultural studies, anthropology, feminist studies, and related fields in order to serve as a seminal guide to the political, legal and social uses of ignorance in social and political life. Chapter 33 of this book is freely available as a downloadable Open Access PDF under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license available here: https://tandfbis.s3-us-west-2.amazonaws.com/rt-files/docs/Open+Access+Chapters/9780415718967_oachapter33.pdf
Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spaces and Identities in Border Regions written by Christian Wille and published by transcript Verlag. This book was released on 2015-11-30 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatial and identity research operates with differentiations and relations. These are particularly useful heuristic tools when examining border regions where social and geopolitical demarcations diverge. Applying this approach, the authors of this volume investigate spatial and identity constructions in cross-border contexts as they appear in everyday, institutional and media practices. The results are discussed with a keen eye for obliquely aligned spaces and identities and relinked to governmental issues of normalization and subjectivation. The studies base upon empirical surveys conducted in Germany, France, Belgium and Luxembourg.
Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.
Download or read book The Routledge Research Companion to Border Studies written by Professor Doris Wastl-Walter and published by Ashgate Publishing, Ltd.. This book was released on 2012-11-28 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume brings together a multidisciplinary team of leading scholars to provide an authoritative, state-of-the-art review of all aspects of borders and border research. It is global in scope and embraces the more traditional strands of the field including geopolitics, migration and territorial identities, and also recently emerging topics such as the role of borders in a seemingly borderless world; creating neighbourhoods, and border enforcement in the post-9/11 era.
Download or read book On Adam s House in Paradise written by Joseph Rykwert and published by Mit Press. This book was released on 1981-01-01 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of On Adam's House in Paradise (first published by the Museum of Modern Art) incorporates all the original illustrations and several new ones, as well as additional text by the author.On Adam's House in Paradise "takes off backward through history hunting for Adam's house, the original image. En route, with wry wit and charm, Rykwert singes every generation of architectural theoreticians back to Vitruvius, but he manages to illuminate their efforts and their immolations." ;Charles Moore, Progressive Architecture
Download or read book Flexible Housing written by Jeremy Till and published by Routledge. This book was released on 2016-09-19 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexible housing is housing that can adjust to the changing needs of the user and accommodate new technologies as they emerge. Flexible Housing by Jeremy Till and Tatjana Schneider examines the past, present and future of this important subject through over 160 international examples. Specially commissioned plans, printed to scale, together with over 200 illustrations and diagrams provide fascinating detail and allow direct visual comparisons to be made. Combining history, theory and design the book explains the social and economic benefits that can be achieved and shows the various ways it has been and can be delivered. The book ends with an accessible guide to how flexible housing might be designed and constructed today to achieve adaptable and ultimately sustainable buildings. Housing designers, housing managers and students of architecture, construction and housing will find this book of immense value both as a comprehensive reference and design manual.
Download or read book Cambridge Yearbook of European Legal Studies Vol 13 2010 2011 written by Catherine Barnard and published by Bloomsbury Publishing. This book was released on 2011-12-15 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cambridge Yearbook of European Legal Studies provides a forum for the scrutiny of significant issues in EU Law, the law of the European Convention on Human Rights, and Comparative Law with a 'European' dimension, and particularly those issues which have come to the fore during the year preceding publication. The contributions appearing in the collection are commissioned by the Centre for European Legal Studies (CELS) Cambridge, a research centre in the Law Faculty of the University of Cambridge specialising in European legal issues. The papers presented are at the cutting edge of the fields which they address, and reflect the views of recognised experts drawn from the University world, legal practice, and the institutions of both the EU and its Member States. Inclusion of the comparative dimension brings a fresh perspective to the study of European law, and highlights the effects of globalisation of the law more generally, and the resulting cross fertilisation of norms and ideas that has occurred among previously sovereign and separate legal orders. The Cambridge Yearbook of European Legal Studies is an invaluable resource for those wishing to keep pace with legal developments in the fast moving world of European integration. INDIVIDUAL CHAPTERS Please click on the link below to purchase individual chapters from Volume 13 through Ingenta Connect: www.ingentaconnect.com SUBSCRIPTION TO SERIES To place an annual online subscription or a print standing order through Hart Publishing please click on the link below. Please note that any customers who have a standing order for the printed volumes will now be entitled to free online access. www.hartjournals.co.uk/cyels/subs Editorial Advisory Board: Albertina Albors-Llorens, John Bell, Alan Dashwood, Simon Deakin, David Feldman, Richard Fentiman, Angus Johnston, John Spencer Founding Editors: Alan Dashwood and Angela Ward Ius Commune Prize 2012 Alexandre Saydé wrote Chapter 15 in this volume entitled: 'One Law, Two Competitions: An Enquiry into the Contradictions of Free Movement Law' and we are delighted to announce that he has been awarded the Ius Commune Prize 2012.
Download or read book A History of Pisa written by William Heywood and published by Cambridge University Press. This book was released on 2010-08-26 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heywood's 1921 history of Pisa is a valuable addition to the study of the historiography of medieval Italy.
Download or read book Medieval Libraries of Great Britain written by Neil Ripley Ker and published by London : Offices of the Royal Historical Society. This book was released on 1941 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Betrifft die Handschrift Cod. 69 der Burgerbibliothek Bern (S. 82, 126).
Download or read book Socialism Perestroika and the Dilemmas of Soviet Economic Reform written by John E Tedstrom and published by Routledge. This book was released on 2021-12-13 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights that Soviet economic planners and politicians must come to recognize the need to make fundamental changes, not simply incremental refinements, in the failing Soviet system. It examines the dynamics of the process of perestroika and the complexity of individual economic issues.
Download or read book The Ladybird Illustrated written by D H Lawrence and published by . This book was released on 2020-11-09 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Ladybird is a long tale or novella by D. H. Lawrence. It was first drafted in 1915 as a short story entitled The Thimble. Lawrence rewrote and extended it under a new title in December 1921 and sent the final version to his English agent on 9 January 1922. It was collected with two other tales, The Captain's Doll and The Fox, and the three novellas were then published in London by Martin Secker in March 1923 under the title The Ladybird and in New York by Thomas Seltzer as The Captain's Doll in April 1923."
