Download or read book ELABORATION ET ETUDE PHYSIQUE DES FILMS DE GRENAT POUR MEMOIRES MAGNETIQUES A L ETAT SOLIDE written by OLIVIER.. NAVARRO and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CES TRAVAUX SUR L'ELABORATION ET L'ETUDE PHYSIQUE DE MATERIAUX POUR MEMOIRES MAGNETIQUES A L'ETAT SOLIDE SE DECOMPOSENT EN TROIS OBJECTIFS: LA RECHERCHE DE FILMS DE GRENATS FERRIMAGNETIQUES A HAUTE TEMPERATURE DE CURIE SUPPORTANT DES DOMAINES SUBMICRONIQUES, NOUS A CONDUIT A OPTIMISER LES CONDITIONS DE CROISSANCE AFIN DE CONTROLER LES PROPRIETES MAGNETIQUES DE BASE TELLES QUE L'ANISOTROPIE UNIAXIALE OU L'AIMANTATION A SATURATION; L'ETUDE, A PARTIR DE CONSIDERATIONS PHYSIQUES ET TECHNOLOGIQUES, DES PROPRIETES MAGNETIQUES DE NOMBREUSES COMPOSITIONS DE GRENAT POUR MEMOIRES A LIGNES DE BLOCH VERTICALES DE PREMIERE GENERATION A PERMIS L'OBTENTION D'UN MATERIAU IDEAL POUR CE TYPE D'APPLICATION; NOUS NOUS SOMMES PARTICULIEREMENT INTERESSES AUX PROBLEMES DE COERCIVITE ET DE REPRODUCTIBILITE. NOUS AVONS PARTICIPE A L'IDENTIFICATION, A PARTIR DES TESTS DE LA FONCTION LECTURE, D'UN CRITERE DE LECTURE PREDICTIBLE RELIE AU RAPPORT ENTRE L'EPAISSEUR DU FILM ET LA LARGEUR D'UNE LIGNE DE BLOCH; L'ELABORATION DE FILMS DE GRENAT POUR ETUDIER L'OBSERVABILITE DES LIGNES DE BLOCH VERTICALES PAR VISUALISATION DIRECTE NOUS A AMENE A IDENTIFIER LE PARAMETRE PHYSIQUE RESPONSABLE D'UN BON CONTRASTE DE LIGNE: LE COEFFICIENT DE QUALITE DU MATERIAU. L'ETUDE DE LA DYNAMIQUE DES LIGNES DANS UNE PAROI ISOLEE RIGIDE A NECESSITE UN AJUSTEMENT PARTICULIER DES PARAMETRES DES FILMS EPITAXIES POSSEDANT UNE ROTATION FARADAY MINIMALE INDISPENSABLE POUR LA VISUALISATION D'UNE PAROI ET REPONDANT A QUATRE CRITERES: UN GRADIENT DE CHAMP POUR STABILISER LA PAROI, UNE LONGUEUR CARACTERISTIQUE SUFFISANTE TOUT EN EVITANT DES DOMAINES MAGNETIQUES INSTABLES, UNE STRUCTURE DE PAROI DEPENDANT DE L'EPAISSEUR DU FILM ET SURTOUT UN FACTEUR DE QUALITE SUFFISAMMENT FAIBLE POUR L'OBTENTION D'UN BON CONTRASTE DE LIGNE. MEME SI LA COMBINAISON DE CES CONTRAINTES REDUIT CONSIDERABLEMENT LE CHAMP D'INVESTIGATION, NOUS AVONS PU ELABORER DES ECHANTILLONS A HAUTE TEMPERATURE DE CURIE PRESENTANT UNE FAIBLE COERCIVITE ET DIFFERENTS COEFFICIENTS D'AMORTISSEMENT
Download or read book ELABORATION ET ETUDE PHYSIQUE DE FILMS DE GRENAT FERRIMAGNETIQUE APPLICATION A LA LECTURE OPTIQUE DE BANDES MAGNETIQUES A HAUTES DENSITES written by YVES.. TOUIZER and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA FAISABILITE D'UN TRANSDUCTEUR MAGNETO-OPTIQUE (FILM DE GRENAT POLYSUBSTITUE) POUR LA LECTURE OPTIQUE DE BANDES MAGNETIQUES ENREGISTREES A HAUTE DENSITE A ETE OBTENUE. L'OPTIMISATION DES CONDITIONS D'ELABORATION A PERMIS D'AJUSTER LA COMPOSITION ET D'ADAPTER LES PROPRIETES PHYSIQUES DE CES COUCHES MINCES EPITAXIEES A L'APPLICATION ENVISAGEE. LA DEPENDANCE DE L'ANISOTROPIE INDUITE PAR CROISSANCE AVEC LA VITESSE DE CROISSANCE A ETE DEMONTREE. DES FILMS DE GRENAT SOUS FORME DE BI-COUCHE ONT ETE ELABORES ET ETUDIES. CES GRENATS ONT ETE UTILISES EN IMAGERIE MAGNETIQUE; LES CONDITIONS LIANT LES PROPRIETES DU MATERIAU A CELLES DU MEDIA A LIRE ONT ETE ETABLIES AFIN D'OPTIMISER LE TRANSFERT D'INFORMATIONS A HAUT RYTHME
Download or read book Elaboration de films de grenat magn tique par pitaxie en phase liquide et caract risation des films pour m moires bulles de grande capacit bulles microniques written by Hubert Moriceau and published by . This book was released on 1981 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: EXISTENCE ET STABILITE DES DOMAINES MAGNETIQUES, MODELE THEORIQUE APPLIQUE AU CALCUL DE L'AIMANTATION A SATURATION ET DE LA LONGUEUR CARACTERISTIQUE DU MATERIAU. CHOIX ET ELABORATION DU MATERIAU POUR MEMOIRES A BULLES MAGNETIQUES. CARACTERISATION DES FILMS MAGNETIQUES. CROISSANCE DES COUCHES MINCES. RESULTATS DES SUBSTITUTIONS DE FERRITES GRENATS SUR LES SITES TETRAEDRIQUES (GA, GE, SI) ET SUR LES SITES DODECAEDRIQUES (SM, Y, LU)
Download or read book laboration de films de grenat magn tique par pitaxie en phase liquide et caract risation des films pour m moires bulles de grande capacit bulles microniques written by Hubert Moriceau (auteur d'une thèse de sciences.) and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Films Ni Mn Ga et m moire de forme magn tique written by Jérémy Tillier (auteur en physique des matériaux).) and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les matériaux actifs appliqués actuellement, comme les piézoélectriques et les magnétostrictifs, peuvent respectivement changer leur forme par l'application d'un champ électrique, et d'un champ magnétique. La portée des allongements relatifs de ces matériaux, est typiquement de l'ordre de 0,1%. En 1996, un nouveau mécanisme fondamental d'actionnement a été découvert dans la phase martensite d'alliages magnétiques à mémoire de forme. Dans les monocristaux d'alliages Ni-Mn-Ga, l'optimisation de ce nouvel effet mémoire de forme a conduit, en 2002, à l'observation d'allongements relatifs qui atteignent 10%. De telles déformations sont liées au réarrangement, induit magnétiquement, de la structure martensitique maclée. De plus, elles ont été observées sous des champs magnétiques relativement faibles, inférieurs au tesla. Grâce à la combinaison unique d'une très grande déformation, d'une haute densité d'énergie, et d'une fréquence d'actionnement magnétique qui est relativement élevée, les alliages magnétiques à mémoire de forme ouvrent la porte à de nouvelles applications, qui ne peuvent pas être réalisées avec les matériaux actifs classiques. En collaboration avec Schneider Electric, et dans le but d'utiliser le potentiel élevé de miniaturisation de l'effet mémoire de forme magnétique, les recherches se sont concentrées sur la réalisation de films Ni-Mn-Ga dans ce travail de thèse. Les recherches menées se sont articulées autour de deux grands axes. L'étude s'est dans un premier temps focalisée sur la recherche d'un procédé, qui permet la libération de films Ni-Mn-Ga, avant le recuit à haute température. Une deuxième part des investigations s'est concentrée sur l'obtention et l'étude de films Ni-Mn-Ga déposés épitaxiallement. Une solution innovante, directement inspirée des techniques de la micro-électronique, a été développée pour libérer des films Ni-Mn-Ga. Un travail d'élaboration conséquent a été réalisé et a abouti à l'obtention de films libres polycristallins à texture de fibre, qui possèdent des propriétés magnétiques comparables aux massifs, et qui présentent des transformations martensitiques réversibles. Un deuxième axe de recherche s'est concentré sur l'élaboration et l'étude de films Ni-Mn-Ga déposés épitaxiallement. Là encore, un travail important d'élaboration a dû être mené. Afin de contrôler précisément la composition des films déposés épitaxiallement sur MgO (001), un procédé de copulvérisation a été développé. L'effet mémoire de forme magnétique des alliages Ni-Mn-Ga, se produit uniquement dans certaines phases martensites modulées, dont la nature est encore énormément débattue aujourd'hui. Nous verrons que l'analyse détaillée des structures et textures de nos films déposés épitaxiallement, a permis de mieux comprendre la nature des martensites modulées des alliages Ni-Mn-Ga. De plus, dans nos films, les champs d'activation du réarrangement de la martensite maclée sont de seulement quelques centièmes de tesla, nettement inférieurs à ceux rapportés dans les matériaux massifs. Ce résultat relance fortement l'intérêt d'utiliser des films dans la réalisation d'actionneurs utilisant l'effet mémoire de forme magnétique.
Download or read book FILMS MINCES DE GRENAT FERRIMAGNETIQUES POUR ENREGISTREMENT THERMOMAGNETOOPTIQUE written by YAZID.. BRAIK and published by . This book was released on 1992 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES TRAVAUX DE CE MEMOIRE SE SITUENT DANS LE CADRE DE RECHERCHES INTENSES POUR DEFINIR DES MATERIAUX MAGNETIQUES INTERESSANTS TANT SUR LE PLAN FONDAMENTAL QUE SUR LE PLAN DES APPLICATIONS POUR REPONDRE AUX NECESSITES TECHNOLOGIQUES FUTURES, ESSENTIELLEMENT DANS LE DOMAINE DE L'ENREGISTREMENT MAGNETOOPTIQUE RE-INSCRIPTIBLE A HAUTE DENSITE. C'EST DANS CETTE PERSPECTIVE QU'UNE ETUDE EN PROFONDEUR DES GRENATS FERRIMAGNETIQUES POLYCRISTALLINS DE COMPOSITION BIGA-DYIG A ETE CONSIDEREE, LAISSANT ENTREVOIR LA POSSIBILITE D'ELABORER DES FILMS MINCES DE COMPOSITION STCHIOMETRIQUE ET DE PHASE GRENAT OFFRANT DES FACTEURS DE MERITE AUX COURTES LONGUEURS D'ONDES FAVORABLES AUX GRANDES DENSITES DE STOCKAGE, AINSI QU'UNE RESISTANCE A LA CORROSION NETTEMENT SUPERIEURE A CELLE DES ALLIAGES TERRE RARE-METAUX DE TRANSITION. A CET EFFET, UNE ETUDE APPROFONDIE DES CORRELATIONS EXISTANT ENTRE LES PARAMETRES INTRINSEQUES MAGNETIQUES ET MAGNETOOPTIQUES, LA STRUCTURE ET LA MICROSTRUCTURE, LA COMPOSITION ET LA STCHIOMETRIE, LES CONDITIONS DE DEPOT ET DE TRAITEMENT THERMIQUE POST-DEPOT DES FILMS D'OXYDES MAGNETIQUES DE PHASE GRENAT, A ETE EFFECTUEE. DANS UNE PREMIERE PHASE, LES CONDITIONS REQUISES POUR ELABORER PAR TECHNIQUE DE FRITTAGE DES CIBLES DE COMPOSITIONS ET TEXTURES APPROPRIEES SONT PRESENTEES. DANS UNE SECONDE PARTIE, ON PROCEDE A UNE ETUDE SYSTEMATIQUE DES CONDITIONS TECHNOLOGIQUES DE DEPOT DE FILMS MINCES DE GRENATS FERRIMAGNETIQUES PAR PULVERISATION CATHODIQUE RF. ON MONTRE QUE L'OPTIMISATION DES FILMS DE GRENAT MAGNETIQUES POUR LES MEDIAS D'ENREGISTREMENT MAGNETOOPTIQUE RE-INSCRIPTIBLE DE SECONDE GENERATION IMPLIQUE DES CONDITIONS TRES RESTRICTIVES DE DEPOT ET DE TRAITEMENT THERMIQUE POST-DEPOT
Download or read book Twilight written by Stephenie Meyer and published by Little, Brown Books for Young Readers. This book was released on 2007-07-18 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fall in love with the addictive, suspenseful love story between a teenage girl and a vampire with the book that sparked a "literary phenomenon" and redefined romance for a generation (New York Times). Isabella Swan's move to Forks, a small, perpetually rainy town in Washington, could have been the most boring move she ever made. But once she meets the mysterious and alluring Edward Cullen, Isabella's life takes a thrilling and terrifying turn. Up until now, Edward has managed to keep his vampire identity a secret in the small community he lives in, but now nobody is safe, especially Isabella, the person Edward holds most dear. The lovers find themselves balanced precariously on the point of a knife -- between desire and danger. Deeply romantic and extraordinarily suspenseful, Twilight captures the struggle between defying our instincts and satisfying our desires. This is a love story with bite. It's here! #1 bestselling author Stephenie Meyer makes a triumphant return to the world of Twilight with the highly anticipated companion, Midnight Sun: the iconic love story of Bella and Edward told from the vampire's point of view. "People do not want to just read Meyer's books; they want to climb inside them and live there." -- Time "A literary phenomenon." -- The New York Times
Download or read book A Phonetic Dictionary of the English Language written by Hermann Michaelis and published by . This book was released on 1913 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quaternary Vegetation Dynamics written by Jürgen Runge and published by CRC Press. This book was released on 2021-11-28 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book celebrates the relaunch of the African Pollen Database, presents state-of-the-art of modern and ancient pollen data from sub-Saharan Africa, and promotes Open Access science. Pollen grains are powerful tools for the study of past vegetation dynamics because they preserve well within sedimentary deposits and have a huge diversity in ornamentation that allows different taxa to be determined. The reconstruction of past vegetation from the examination of ancient pollen records thus can be used to characterize the nature of past landscapes (e.g. abundance of forests vs. grasslands), provide insights into changes in biodiversity, and gain empirical evidence of vegetation response to climatic change and human activity. In this, the 35th Volume of "Palaeoecology of Africa", we bring together new data and extensive synthetic reviews to provide novel insights into the relationships between human evolution, human activity, climate change and vegetation dynamics during the Quaternary, the last 2.6 million years. Current and ongoing climate and land-use change is exerting pressure on modern vegetation formations and threatening the livelihoods and wellbeing of many peoples in Africa. In this book the focus is on the Quaternary because it is during this geological period that the modern vegetation formations developed into their current configurations against a backdrop of high magnitude global climate change (glacial-interglacial cycles), human evolution, and a growing human land-use footprint. In this book the latest information is presented and collated from around the African continent to parameterize past vegetation states, identify the drivers of vegetation change, and assess the vegetation resilience to change. To achieve this research from two broad themes are covered: (i) the present is the key to the past (i.e. studies which improve our understanding of modern environments so that we can better interpret evidence from the past), and (ii) the past is the key to the future (i.e. studies which unlock information on how and why vegetation changed in the past so one can better anticipate trajectories of future change). This Open Access book will provide a strong foundation for future research exploring past ecological, environmental and climatic change within Africa and the surrounding islands. The book is organized regionally (covering western, eastern, central, and southern Africa) and it contains specialized articles focused on particular topics (such as modern pollen-vegetation relationships and fire as a driver of vegetation change), as well as regional and pan-African syntheses drawing together decades of research to assess key scientific questions (including the role of climate in driving vegetation change and the role of vegetation change in human evolution). These articles will be useful to students and teachers from high school to the highest level of university who are interested in the origins and dynamics of vegetation in Africa. Furthermore, it is also meant to provide societally relevant information that can act as an inspiration for the development of sustainable management practices for the future.
Download or read book The Acharnians written by Aristophanes and published by BoD – Books on Demand. This book was released on 2019-09-25 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reproduction of the original: The Acharnians by Aristophanes
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 Realism Rationalism Surrealism written by Fer and published by Yale University Press. This book was released on 1993-01-01 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book begins by considering responses by French artists to the First World War, showing how Purism, Dada, and early Surrealism are related to the ethos of post-war reconstruction. The authors then discuss the language of construction in places as dissimilar as France, Germany, and the Soviet Union; the contrasting demands of the utility and decoration of objects and paintings; and the relationship of surrealism to questions of sexuality and gender and to Freudian theory. The book concludes by addressing the widespread debate over realism in art: whether it represents an alternative to the elitism of the avant-garde or whether avant-garde art should play a role in the development of a modern realism.
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 Notes on the Minor Prophets written by Henry Allan Ironside and published by . This book was released on 1955 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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."
Download or read book Artists Under Vichy written by Michèle C. Cone and published by . This book was released on 1992 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: While France endured one of the darkest hours of its entire history, from the occupation of Paris in June 1940 to the liberation of the city four years later, the French art world displayed an astonishing burst of creativity, an atmosphere of laissez-faire and pluralism that seems at odds with the repressive nature of culture under authoritarian regimes. So reveals Michle Cone in this provocative work on the art of Vichy and occupied France. But, as Cone also discloses, Vichy xenophobia and Nazi racism kept many artists from participating in this bonanza of artistic activity. In Artists under Vichy, both narrative and illustrations demonstrate in full detail the contrast between the "haves" and the "have-nots" during a vital but until now little explored artistic period. The first section of the work analyzes the lavish attention paid to both academic and nonacademic art by the official French press, by Vichy, and by German observers. Cone hypothesizes that the German strategy in Vichy France was to allow the display of nonconformist art, outlawed as "degenerate" in Germany, in order to distract the public from the secret seizure of museum pieces and Jewish art collections--and from other, far greater Nazi crimes. Neither among the "haves" nor the "have-nots," Picasso, forbidden to exhibit, lived through this period in Paris, quietly but productively. The second section of this book considers his production and that of the true "have-nots"--persecuted artists, including resisters and Jews, in hiding or self-imposed exile from Paris in the free zone. Among the "have-nots" discussed here are Arp, Sophie Taeuber-Arp, Sonia Delaunay, Alberto Magnelli, Otto Freundlich, Victor Brauner, and Hans Bellmer. With increasing public interest focused on art branded "degenerate" by Hitler, Cone's text provides exciting new insights into creativity, collaboration, and resistance in artists' milieux under a repressive regime.
Download or read book Paris Under the Occupation written by Jean-Paul Sartre and published by Now and Then Reader LLC. This book was released on 2011-11-15 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: As Hitler armed in the mid-1930s, Europe prepared for war. With its sophisticated series of fortifications called the Maginot Line, France expected to thwart any rapid German advance from the east so that, with England, the countries could fight an updated version of their World War I experience. But Hitler's blitzkrieg ("lightning war") tactics, based upon rapid tank and troop movements, overran the powerful French army. In 1940 France fell in just six weeks. Churchill's anticipated bulwark against Nazi aggression on the continent disappeared as Hitler marched into Paris, the city largely intact. For more than four years, France lived under a German occupation that reinforced its shame and sapped its energies. Afterward, the renowned French philosopher Jean-Paul Sartre attempted to explain France's experience under the occupation and repair the nation's now tarnished reputation.
