1,921 research outputs found
Sinus rhythm mimicking atrial fibrillation recurrence
No full text© 2007 Elsevier Inc.Thomas Rostock, Prashanthan Sanders, Martin Rotter and Michel Haïssaguerr
Sinus node region as an ultimate source driving chronic atrial fibrillation
No full textThe definitive version is available at www.blackwell-synergy.comYoshihide Takahashi, Prashanthan Sanders, Martin Rotter, Thomas Rostock, Michel Haïssaguerr
Techniques for curative treatment of atrial fibrillation
No full textThe definitive version is available at www.blackwell-synergy.comMélèze Hocini, Prashanthan Sanders, Pierre Jaîs, Li-Fern Hsu, Yoshihide Takahashi, Martin Rotter, Jacques Clémenty, Michel Haîssaguerr
Narratives of Bombing: Tokyo and Hiroshima, 1945
No full textThe University Archives has determined that this item is of continuing value to OSU's history.The media can be accessed here: http://streaming.osu.edu/knowledgebank/mershon10/051310.mp4Andy Rotter is Charles A. Dana Professor of History at Colgate College. He is a specialist in U.S. diplomatic history, recent U.S. history, and the Vietnam War. His research interests focus on U.S.-Asia relations, the Cold War, and history of the senses. Rotter is the author of Hiroshima: The World's Bomb (Oxford University Press, 2008), Comrades at Odds: Culture and Indo-U.S. Relations, 1947-1964 (Cornell University Press, 2000), and The Path to Vietnam (Cornell University Press, 1987). He is the editor of Light at the End of the Tunnel: A Vietnam War Anthology (Rowman and Littlefield, 2010) now in its third edition. His numerous distinctions include President of the Society for Historians of American Foreign Relations, Gandhi Peace Foundation Fellowship, Harry S Truman Library Institute grant, and American Council of Learned Societies Senior Fellowship. Before joining the faculty at Colgate, Rotter taught at St. Mary’s College and Vanderbilt University. He received his M.A. and Ph.D. from Stanford University and his B.A. from Cornell University.Ohio State University. Mershon Center for International Security Studie
Disconnection of the left atrial appendage for elimination of foci maintaining atrial fibrillation
No full textThe definitive version is available at www.blackwell-synergy.comWe report a case with paroxysmal atrial fibrillation, in whom multiple foci were identified in the left atrial appendage after pulmonary vein isolation. The patient was successfully treated by catheter ablation to disconnect this structure.Yoshihide Takahashi, Prashanthan Sanders, Martin Rotter, Michel Haïssaguerr
The Behaviour of Steel-Framed Composite Structures in Fire Conditions
No full textOver the last decade it has become increasingly clear that the traditional methods of fire safety design can be unnecessarily conservative and therefore expensive. In 1995 a series of fire tests were carried out at Cardington, UK on a full-scale eight storey steel-concrete composite building. These tests produced an extensive body of data about the response of such structures to fire conditions and it is intended that this data be used to develop a clearer understanding of the structural behaviour involved. This thesis presents a method of analysing the behaviour of structures such as the Cardington frame using the commercial finite element package ABAQUS, with the addition of user defined subroutines; applies the method to two of the Cardington tests and analyses the results.
FEAST, a suite of computer programmes that defines the behaviour of shell finite elements using a stress-resultant approach, was programmed for use with ABAQUS. The FEAST suite consists of two main programmes. The first, SRAS, is designed to model the behaviour of orthotropic plate sections at elevated temperatures. The second, FEAI, interfaces with the finite element package ABAQUS and allows realistic models of the behaviour of whole structures in fire conditions to be obtained. Phenomena modelled by FEAST include non-linear thermal gradients, non-linear material behaviour and coupling between membrane and bending forces.
FEAST was used to analyse the behaviour of the Cardington Restrained Beam Test and the Cardington Corner Test. In both cases it was possible to produce a comprehensive set of results showing the variation of forces, moments and deflections in the structure under fire conditions. In addition, a number of parametric studies were performed to determine the effect of factors such as slab temperature and coefficient of thermal expansion on the behaviour of the structure. Special attention was given to the role of tensile mebrane action.
The results showed that the behaviour of the heated structure was very different to that of an unheated structure. The response of the structure was shown to be very strongly governed by restrained thermal expansion and by thermal gradients. Degradation of material properties were found to have only a secondary effect on the structural behaviour
An approach to noncavotricuspid isthmus dependent flutter
No full textPierre Jaïs, Mélèze Hocini, Prashanthan Sanders, Li-Fern Hsu, Martin Rotter, Fréderic Sacher, Yoshihide Takahashi, Thomas Rostock, Philippe Le Metayer, Jacques Clémenty, Michel Haïssaguerr
Magnetic and magnetoelastic properties of cobalt ferrite
No full textKobaltferrit (CoFe2O4) ist ein interessantes Material als Sensor und Aktuator aufgrund seiner hohen Korrosionsbeständigkeit, hohen Magnetostriktion und - im Vergleich zu seltenen Erden basierenden Sensoren - niedrigen Herstellungskosten. Darüber hinaus machen die hohe Magnetfeld-Sensitivität der Magnetostriktion und die hohe Empfindlichkeit der Magnetisierung auf externen Druck Kobaltferrit zu einem idealen Kandidaten für die industrielle Anwendung als Sensor und Aktuator.Obwohl Kobaltferrit seit über sechzig Jahren untersucht wird, gibt es noch immer viele offene Fragen und Probleme. Eine sehr fundamentale Fragestellung, die in dieser Arbeit diskutiert wird, ist die Bestimmung der ``echten'' Magnetostriktionswerte bei Proben mit nicht vernachlässigbarer Remanenz. Zusätzlich hat Guillot (CNRS, Grenoble) 1988 einen Sprung in der magnetfeldabhängigen Magnetisierung entlang harten Magnetisierungsachse bei Kobaltferrit und Cadmium substituiertem Kobaltferrit gefunden. Dieser Sprung wurde durch ``Spin-Flip'' Verhalten erklärt, was aufgrund der geringen Feldstärke nicht überzeugend ist.Daher wurde im Rahmen dieser Arbeit dieser Übergang mit Hilfe von Magnetisierungs- und Magnetostriktionsmessungen als Funktion von Temperatur und Magnetfeld untersucht. Wir haben herausgefunden, dass dieser Übergang als Magnetisierungsprozess erster Ordnung (FOMP) klassifiziert werden kann, der sehr oft in uni-axialen, hartmagnetischen Materialien wie Nd2Fe14B oder PrCo5 vorkommt. Hingegen wird in kubischen, auf 3d Elementen basierenden Materialien - wie Kobaltferrit - ein FOMP sehr selten beobachtet. Der dem FOMP zugrunde liegende Prozess ist ein Sprung des Magnetisierungsvektors über eine Energiebarriere, die durch magnetische Anisotropie verursacht wird. Dieser Sprung wird auch in der Magnetostriktion beobachtet, da diese von der Spin-Bahn-Kopplung verursacht wird. Daher wurde auch die magnetische Anisotropie als Funktion der Temperatur bestimmt und deren verschiedene Beiträge in Abhängigkeit der Temperatur analysiert. Zusammenfassend wurde eine sehr detaillierte und systematische Untersuchung der magnetischen und magnetostriktiven Eigenschaften von einkristallinem und vielkristallinem Kobaltferrit durchgeführt und diese Ergebnisse mit Theorie und Literatur verglichen.Cobalt ferrite (CoFe2O4) is interesting as magnetostrictive sensor and actuator material because of a high corrosion resistance, a high value of magnetostriction and very low costs compared to rare-earth based magnetostrictive sensor materials. Moreover the large strain derivative and the high sensitivity of magnetization to applied stress make it a perfect candidate for industrial applications as sensor and actuator.Although cobalt ferrite is under examination for more than sixty years, there are still quite a lot of open questions and problems. One very fundamental problem is the determination of the ``true'' magnetostriction value of a material with a non negligible remanence which will be discussed here. Additionally in 1988 Guillot (CNRS, Grenoble) observed a jump in the field dependence of the magnetization along the magnetic hard axis in pure cobalt ferrite and also cadmium substituted cobalt ferrite. This jump was explained as a spin-flip.Because of the rather low critical field this explanation was not conclusive.Therefore within this work this transition was studied by measuring the magnetization as well as the magnetostriction as function of temperature and applied magnetic field. We found out that this transition can be classified as a first order magnetization process (FOMP), which is quite often observed for uniaxial, hard magnetic materials like compounds for permanent magnets Nd2Fe14B or PrCo5. Whereas in cubic 3d based materials - as cobalt ferrite - a FOMP is not very often seen. The underlying process of a FOMP is a jump of the magnetization vector over an energy barrier caused by the magnetic anisotropy energy. This jump is also clearly visible in the magnetic field dependence of the magnetostriction due to spin orbit coupling. In the case of cobalt ferrite we measured the change of the magnetic anisotropy as function of temperature and analyzed the effect of different anisotropy contributions with respect to their temperature dependence.Summarizing, a very concise study of the magnetic and magnetostrictive properties of single- as well as polycrystalline cobalt ferrites was performed and compared with theory and literature
Mitral isthmus ablation for atrial fibrillation
No full textThe definitive version is available at www.blackwell-synergy.comPierre Jaîs, Li-Fern Hsu, Martin Rotter, Prashanthan Sanders, Yoshihide Takahashi, Thomas Rostock, Fréderic Sacher, Mélèze Hocini, Jacques Clémenty, and Michel Haîssaguerr
Pulmonary and thoracic vein sources: the focal theory of atrial fibrillation
No full textThe definitive version is available at www.blackwell-synergy.comPrashanthan Sanders, Mélèze Hocini, Pierre Jaïs, Yoshihide Takahashi, Thomas Rostock, Fréderic Sacher, Anders Jonsson, Martin Rotter, Li-Fern Hsu and Michel Haïssaguerrehttp://www.blackwellpublishing.com/contents.asp?ref=978140514032
- …
