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6篇 您的检索式:作者名="Alexander Kara"
    题名 作者 年代 出处 被引量
1Global kinematics of tectonic plates and subduction zones since the late Paleozoic Era显示文摘Detailed global plate motion models that provide a continuous description of plate boundaries through time are an effective tool for exploring processes both at and below the Earth's surface. A new generation of numerical models of mantle dynamics pre-and post-Pangea timeframes requires global kinematic descriptions with full plate reconstructions extending into the Paleozoic(410 Ma). Current plate models that cover Paleozoic times are characterised by large plate speeds and trench migration rates because they assume that lowermost mantle structures are rigid and fixed through time. When used as a surface boundary constraint in geodynamic models, these plate reconstructions do not accurately reproduce the present-day structure of the lowermost mantle. Building upon previous work, we present a global plate motion model with continuously closing plate boundaries ranging from the early Devonian at 410 Ma to present day.We analyse the model in terms of surface kinematics and predicted lower mantle structure. The magnitude of global plate speeds has been greatly reduced in our reconstruction by modifying the evolution of the synthetic Panthalassa oceanic plates, implementing a Paleozoic reference frame independent of any geodynamic assumptions, and implementing revised models for the Paleozoic evolution of North and South China and the closure of the Rheic Ocean. Paleozoic(410-250 Ma) RMS plate speeds are on average ~8 cm/yr, which is comparable to Mesozoic-Cenozoic rates of ~6 cm/yr on average.Paleozoic global median values of trench migration trend from higher speeds(~2.5 cm/yr) in the late Devonian to rates closer to 0 cm/yr at the end of the Permian(~250 Ma), and during the Mesozoic-Cenozoic(250-0 Ma) generally cluster tightly around ~1.1 cm/yr. Plate motions are best constrained over the past 130 Myr and calculations of global trench convergence rates over this period indicate median rates range between 3.2 cm/yr and 12.4 cm/yr with a present day median rate estimated at~5 cm/yr. For Paleozoic times(410-251 Ma) our model results in median convergence rates largely~5 cm/yr. Globally,~90% of subduction zones modelled in our reconstruction are determined to be in a convergent regime for the period of 120-0 Ma. Over the full span of the model, from 410 Ma to 0 Ma,~93% of subduction zones are calculated to be convergent, and at least 85% of subduction zones are converging for 97% of modelled times. Our changes improve global plate and trench kinematics since the late Paleozoic and our reconstructions of the lowermost mantle structure challenge the proposed fixity of lower mantle structures, suggesting that the eastern margin of the African LLSVP margin has moved by as much as ~1450 km since late Permian times(260 Ma). The model of the plate-mantle system we present suggests that during the Permian Period, South China was proximal to the eastern margin of the African LLSVP and not the western margin of the Pacific LLSVP as previous thought.Alexander Young Nicolas Flament Kayla Maloney Simon Williams Kara Matthews Sabin Zahirovic R.Dietmar Müller 2019Geoscience Frontiers2019,10,3:10
2动态电压恢复装置及其特性显示文摘介绍了动态电压恢复装置的组成,及其快速控制响应,减缓电压突降的特性,还提出了该装置设计时要考虑的因素。Kevin Chan Alexander Kara 1998国际电力1998,2,2:3
3Behaviors that predict personality components in adult free-ranging Tibetan macaques Macaca thibetana显示文摘Alexander J. PRITCHARD Lori K. SHEERAN Kara I. GABRIEL Jin-Hua LI Ronald S. WAGNER 2014Current Zoology2014,60,3:2
4Non-compliant and compliant balloons for endovascular rescue therapy of cerebral vasospasm after spontaneous subarachnoid haemorrhage: experiences of a single- centre institution with radiological follow- up of the treated vessel segments显示文摘Background For endovascular rescue therapy(ERT)of cerebral vasospasm(CVS)due to spontaneous subarachnoid haemorrhage(sSAH),non-compliant(NCB)and compliant(CB)balloons are used with both balloon types bearing the risk of vessel injury due to specific mechanical properties.Although severe delayed arterial narrowing after transluminal balloon angioplasty(TBA)for CVS has sporadically been described,valid data concerning incidence and relevance are missing.Our aim was to analyse the radiological follow-up(RFU)of differently TBA-treated arteries(CB or NCB).Methods Twelve patients with utilisation of either NCB or CB for CVS were retrospectively analysed for clinical characteristics,ERT,functional outcome after 3 months and RFU.Compared with the initial angiogram,we classified delayed arterial narrowing as mild,moderate and severe(<30%,30%-60%,respectively>60% calibre reduction).Results Twenty-three arteries were treated with CB,seven with NCB.The median first RFU was 11 months after TBA with CB and 10 after NCB.RFU was performed with catheter angiography in 18 arteries(78%)treated with CB and in five(71%)after NCB;magnetic resonance angiography was acquired in five vessels(22%)treated with CB and in two(29%)after NCB.Mild arterial narrowing was detected in three arteries(13%)after CB and in one(14%)after NCB.Moderate or severe findings were neither detected after use of CB nor NCB.Conclusion We found no relevant delayed arterial narrowing after TBA for CVS after sSAH.Despite previous assumptions that CB provides for more dilatation in segments adjacent to CVS,we observed no disadvantages concerning long-term adverse effects.Our data support TBA as a low-risk treatment option.Alexander Neumann Jan Küchler Claudia Ditz Kara Krajewski Jan Leppert Peter Schramm Hannes Schacht 2021Stroke & Vascular Neurology2021,6,1:1
5The role of clinical care pathways: an experience with distal pancreatectomy显示文摘Daniel P. Nussbaum Kara Penne Paul J. Speicher Sandra S. Stinnett Alexander Perez Rebekah R. White Bryan M. Clary Douglas S. Tyler Dan G. Blazer 2014Journal of Surgical Research2014,,:1
6Accretion in strong field gravity with eXTP显示文摘In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry(eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced 'spectral-timing-polarimetry' techniques to analyze the rapid variations with three orthogonal diagnostics of the flow and its geometry, yielding unprecedented insight into the inner accreting regions, the effects of strong field gravity on the material within them and the powerful outflows which are driven by the accretion process.Alessandra De Rosa Phil Uttley LiJun Gou Yuan Liu Cosimo Bambi Didier Barret Tomaso Belloni Emanuele Berti Stefano Bianchi Ilaria Caiazzo Piergiorgio Casella Marco Feroci Valeria Ferrari Leonardo Gualtieri Jeremy Heyl Adam Ingram Vladimir Karas FangJun Lu Bin Luo Giorgio Matt Sara Motta Joseph Neilsen Paolo Pani Andrea Santangelo XinWen Shu JunFeng Wang Jian-Min Wang YongQuan Xue YuPeng Xu WeiMin Yuan YeFei Yuan Shuang-Nan Zhang Shu Zhang Ivan Agudo Lorenzo Amati Nils Andersson Cristina Baglio Pavel Bakala Altan Baykal Sudip Bhattacharyya Ignazio Bombaci NiccolóBucciantini Fiamma Capitanio Riccardo Ciolfi Wei K.Cui Filippo D'Ammando Thomas Dauser Melania Del Santo Barbara De Marco Tiziana Di Salvo Chris Done Michal Dovciak Andrew C.Fabian Maurizio Falanga Angelo Francesco Gambino Bruce Gendre Victoria Grinberg Alexander Heger Jeroen Homan Rosario Iaria JiaChen Jiang ChiChuan Jin Elmar Koerding Manu Linares Zhu Liu Thomas J.Maccarone Julien Malzac Antonios Manousakis Frédéric Marin Andea Marinucci Missagh Mehdipour Mariano Méndez Simone Migliari Cole Miller Giovanni Miniutti Emanuele Nardini Paul T.O'Brien Julian P.Osborne Pierre Olivier Petrucci Andrea Possenti Alessandro Riggio Jerome Rodriguez Andrea Sanna LiJing Shao Malgosia Sobolewska Eva Sramkova Abigail L.Stevens Holger Stiele Giulia Stratta Zdenek Stuchlik Jiri Svoboda Fabrizio Tamburini Thomas M.Tauris Francesco Tombesi Gabriel Torok Martin Urbanec Frederic Vincent QingWen Wu Feng Yuan Jean J.M.in't Zand Andrzej A.Zdziarski XinLin Zhou 2019Science China(Physics,Mechanics & Astronomy)2019,62,2:1
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