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Numerical Investigation of Flutter stability in Subsonic Space Turbine Blisk with Emphasis on Cut-on/Cut-off Modes and Interblade Phase Angles

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Journal of Thermal Science 2012年第6期21卷 492-499页

作者： Hakim Ferria Pascal Ferrand Franois Pacull stéphane aubert Laboratoire de Mécanique des Fluides et d'Acoustique CNRS UMR 5509 Université de LyonUniversité Claude Bernard Lyon 1INSA Lyon 36avenue Guy de Collongue69134 EcullyFrance Fluorem 64 chemin des Mouilles69134 EcullyFrance

The so-called blisks,*** bladed disks,are characterized by very low viscous material damping and make the flutter prediction much more *** that framework,a two-dimensional numerical study of a space turbine blisk featuring complex deformation of blades and high eigenfrequency(>40kHz)is *** simulations are based on unsteady Reynolds Averaged Navier stokes computations linearized in the frequency domain and consist in the superposition of an unsteady linear(in time)pressure field,generated by a harmonic perturbation,upon a steady nonlinear(in space)*** aerodynamic damping coefficient is calculated over a range of nodal diameters,and the blades are predicted aeroelastically ***,violent changes occur and are rather critical since sudden and large deviations in stability *** that context,the nature of the waves propagating from the cascade are *** an approach provides fundamental knowledge about the perturbations which can either propagate to the far-field(cut-on mode)or decay(cut-off mode).It is expected that the ability of the flow to damp or to amplify the blade motion is strongly affected by the way unsteady perturbations are transferred from the cascade to the *** nature of the waves are first assessed from the aforementioned linearized results,then they are evaluated analytically and finally compared.A good agreement is found despite the strong assumptions of the analytical *** results show a clear correlation between the cut-on/cut-off conditions and *** least stable configuration corresponds to cut-off mode at the inlet and no wave at the *** outgoing waves from the cascade,the blade is prone to be less stable:the energy from the blades vibration is necessarily dissipated or sent out by the cascade.

关键词： subsonic flutter LRANS blisk cut-on/cut-off mode interblade phase angle nodal diameter.

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Geophysical evidence of large-scale silica-rich fluid flow above the continental subduction interface

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Science China Earth Sciences 2024年第9期67卷 2796-2809页

作者： Yuantong MAO Liang ZHAO Marco G.MALUSA stefano SOLARINO Silvia PONDRELLI Baolu SUN Coralie aubert Simone SALIMBENI Elena EVA stéphane GUILLOT state Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Earth and Environmental Sciences University of Milano-BicoccaMilan 20126Italy Istituto Nazionale di Geofisica e Vulcanologia Osservatorio Nazionale TerremotiGenova 16145Italy Istituto Nazionale di Geofisica e Vulcanologia Sezione di BolognaBologna 40127Italy Université Grenoble Alpes Université Savoie Mont BlancCNRSIRDUGEISTerreGrenoble 38000France

Fluids in subduction zones can have major effects on subduction ***,geophysical constraints on the scale and impact of fluid flow during continental subduction are still *** we analyze the VP/VS ratios in the Western Alpine region,hosting one of the best-preserved fossil continental subduction zones worldwide,to investigate the impact of fluid flow during continental *** found a belt of high VP/VS ratios>1.9 on the upper-plate side of the subduction zone,consistent with a partially serpentinized upper-plate mantle,and a belt of unusually low VP/VS ratiosst fluid flow along the continental subduction *** results suggest that past fluid flow may have reduced the effective stress along the subduction interface thus favoring continental subduction.

关键词： Western Alps Crustal structure Receiver function Vp/Vs ratio Silica enrichment

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The therapeutic potential of nerve growth factor combined with blood-brain barrier modulation by focused ultrasound for neurodegenerative disorders

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Neural Regeneration Research 2021年第9期16卷 1783-1785页

作者： Kristiana Xhima Isabelle aubert Department of Laboratory Medicine and Pathobiology University of TorontoTorontoONCanada Hurvitz Brain Sciences Research Program Sunnybrook Research InstituteTorontoONCanada Biological Sciences Sunnybrook Research InstituteTorontoONCanada

Nerve growth factor(NGF) is a neurotrophic factor critical for cholinergic neuronal survival, phenotypic maintenance and plasticity in the mammalian brain. NGF has been implicated in the pathogenesis of neurodegenerat... 详细信息

关键词： degenerative disorders therapeutic

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First seismic evidence for continental subduction beneath the Western Alps

First seismic evidence for continental subduction beneath th...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Liang Zhao Anne Paul stéphane Guillot stefano Solarino Marco G. Malusà Tianyu Zheng Coralie aubert Simone Salimbeni Thierry Dumont stéphane Schwartz Rixiang Zhu Qingchen Wang state Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Université Grenoble Alpes Institut des Sciences de la Terre (ISTerre) CNRS Institut des Sciences de la Terre (ISTerre)

The first discovery of ultrahigh-pressure coesite in the European Alps 30 years ago led to the inference that a positively buoyant continental crust can be subducted to mantle depth;this had been considered impossible since the advent of the plate tectonics concepts. Although continental subduction is now widely accepted, there remains debate because there is little direct(geophysical) evidence of a link between exhumed coesite at the surface and subducted continental crust at depth. Here we provide the first seismic evidence for continental crust at 75 km depth that is clearly connected with the European crust exactly along the transect where coesite was found at the surface. Our data also provide evidence for a thick suture zone with downward-decreasing seismic velocities, demonstrating that the European lower crust underthrusts the Adriatic mantle. These findings, from one of the best-preserved and long-studied ultrahigh-pressure orogens worldwide, shed decisive new light on geodynamic processes along convergent continental margins.

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大陆俯冲界面之上大规模硅富集流体的地球物理学证据

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中国科学：地球科学 2024年第9期54卷 2848-2863页

作者：毛元彤赵亮 Marco G.MALUSÀ stefano SOLARINO Silvia PONDRELLI 孙宝璐 Coralie aubert Simone SALIMBENI Elena EVA stéphane GUILLOT 中国科学院地质与地球物理研究所岩石圈演化与环境演变全国重点实验室北京100029 中国科学院大学地球与行星科学学院北京100049 Department of Earth and Environmental Sciences University of Milano-BicoccaMilan 20126Italy Istituto Nazionale di Geofisica e Vulcanologia Osservatorio Nazionale TerremotiGenova 16145Italy Istituto Nazionale di Geofisica e Vulcanologia Sezione di BolognaBologna 40127Italy UniversitéGrenoble Alpes UniversitéSavoie Mont BlancCNRSIRDUGEISTerreGrenoble 38000France

俯冲带中的流体可能对俯冲过程产生重要影响.然而,关于大陆俯冲期间流体规模及其作用的地球物理约束仍然有限.西阿尔卑斯造山带是全球保存最完好的大陆俯冲带之一,为认识大陆俯冲过程中流体作用的影响提供了重要的参考.本文综合多种地... 详细信息

俯冲带中的流体可能对俯冲过程产生重要影响.然而,关于大陆俯冲期间流体规模及其作用的地球物理约束仍然有限.西阿尔卑斯造山带是全球保存最完好的大陆俯冲带之一,为认识大陆俯冲过程中流体作用的影响提供了重要的参考.本文综合多种地球物理方法分析了西阿尔卑斯造山带地区的V_(P)/V_(S)比值,发现在俯冲区的上盘侧存在高V_(P)/V_(S)(>1.9)带,与部分蛇纹岩化的上覆地幔楔位置一致;而在下盘侧存在异常低的V_(P)/V_(S)(<1.7)带,异常深度浅于30km.本文认为,观测到的低V_(P)/V_(S)比值异常是由地壳内广泛分布的富硅岩脉导致,指示了在俯冲时期大陆俯冲界面之上可能存在的富硅流体流动.本文的结果暗示俯冲时期的流体流动可能降低了俯冲界面的有效应力,从而促进了大陆俯冲.

关键词：西阿尔卑斯造山带地壳精细结构接收函数 V_(P)/V_(S)波速比硅富集

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The CIFALPS seismic experiment: first high-resolution data on the crust and upper mantle structures of the western Alps

The CIFALPS seismic experiment: first high-resolution data o...

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2014年中国地球科学联合学术年会——专题9：深部地幔物质成分与结构探测

作者： Liang Zhao Anne Paul stefano Solarino Tianyu Zheng Coralie aubert Simone Salimbeni stéphane Guillot Rixiang Zhu Qingchen Wang CIFALPS team state Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Institut des Sciences de la Terre (Isterre) CNRS Université Joseph FourierGrenoble France

One classical model of continent-continent collisions is characterized by a series of continental subduction,high-pressure(HP)to ultra high-pressure(UHP)metamorphism of rocks and traveling back of HP(UHP)units to the *** plate subduction was proposed to can be subducted to a depth>100 km based upon the discoveries of UHP rocks in many continental-continental *** best-known and one of the youngest example is the Alpine orogeny,which may have formed by the Europe-Adria continental collision in the *** a Cenozoic orogeny,its structural and metamorphic features well recorded the subduction and exhumation process of orogeny as demonstrated by the surface geological investigations.

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Quantum dot lasing from a waterproof and stretchable polymer film

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Light(Science & Applications) 2022年第10期11卷 2435-2443页

作者： Mohammad Mohammadimasoudi Pieter Geiregat Frederik Van Acker Jeroen Beeckman Zeger Hens Tangi aubert Kristiaan Neyts Nano-Bio-Photonics Lab Faculty of New Sciences and TechnologiesUniversity of TehranTehranIran Liquid Crystals and Photonics Group ELIS DepartmentGhent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium Physics and Chemistry of Nanostructures Department of ChemistryGhent UniversityGhentBelgium Center for Nano-and Biophotonics(NB-Photonics) Ghent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium

Colloidal quantum dots(QDs)are excellent optical gain materials that combine high material gain,a strong absorption of pump light,stability under strong light exposure and a suitability for solution-based *** integration of QDs in laser cavities that fully exploit the potential of these emerging optical materials remains,however,a *** this work,we report on a vertical cavity surface emitting laser,which consists of a thin film of QDs embedded between two layers of polymerized chiral liquid *** directed,circularly polarized defect mode lasing under nanosecond-pulsed excitation is demonstrated within the photonic band gap of the chiral liquid *** and long-term narrow-linewidth lasing of an exfoliated free-standing,flexible film under water is obtained at room ***,we show that the lasing wavelength of this flexible cavity shifts under influence of pressure,strain or *** such,the combination of solution processable and stable inorganic QDs with high chiral liquid crystal reflectivity and effective polymer encapsulation leads to a flexible device with long operational lifetime,that can be immersed in different protic solvents to act as a sensor.

关键词： lasing film polymer

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Rectal ulcer:Due to ketoprofen, argon plasma coagulation and prostatic brachytherapy

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World Journal of Gastroenterology 2014年第45期20卷 17244-17246页

作者： Thibaud Koessler Vincent Servois Pascale Mariani Emilie aubert Wulfran Cacheux Department of Oncology H?pitaux universitaires de Genève Department of Radiology Institut Curie75248 Paris France epartment of Surgical Oncology Institut Curie 75248 Paris France Department of Surgical Oncology Institut Curie 75248 Paris France

Prostatic brachytherapy with permanent seed implants is a recent and safe radiation therapy technique associated with radiation-induced digestive *** plasma coagulation procedure is a validated modality in the management of haemorrhagic radiation proctitis,which is known to occasionally induce chronic rectal *** report here an original case report of an acute painful rectal ulcer as a consequence of the combination of shortterm therapy with non-steroidal anti-inflammatory drugs therapy,prostatic brachytherapy with malposition of seed implants and argon plasma coagulation procedure in a patient with haemorrhagic radiation *** description of this clinical observation is essential to recommend the discontinuation of non-steroidal anti-inflammatory drugs therapy and the control of the position of seed implants in case of prostatic brachytherapy before argon plasma coagulation for radiation-induced proctitis.

关键词： Radiation proctitis Prostatic brachytherapy Argon plasma coagulation Non-steroidal anti-inflammatory drugs

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配方组分和混炼顺序对白炭黑和炭黑填充胶料流变性能和加工性能的影响

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轮胎工业 2001年第7期21卷 418-424页

作者： stéphane schaal aubert Y.Coran Syed K.Mowdood 黄向前 InstituteofPolymerEngineering PirelliTireLLC

能劣化的表现 )的增长比全部一次混炼胶料要慢得多 ,而且 ,白炭黑中的水分含量较低和在混炼阶段高温热处理一样。

关键词：橡胶白炭黑炭黑填充胶料配方混炼流变性能加工性能

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Valorization of AZ91 by the hydrolysis reaction for hydrogen production(Electrochemical approach)

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Journal of Magnesium and Alloys 2021年第6期9卷 1942-1953页

作者： S.Al Bacha I.aubert M.Zakhour M.Nakhl J.L.Bobet LCPM/PR2N(EDst) Lebanese UniversityFaculty of Science II90656 Jdeidet El MetnLebanon Universitéde Bordeaux ICMCBCNRSUMR 5026F-33600 PessacFrance University of Bordeaux CNRSArts et MétiersInstitute of technologyBordeaux INPINRAEI2M BordeauxF-33400 TalenceFrance

The hydrolysis of Mg-based materials appears to be an ideal solution for clean energy *** hydrogen was produced by the hydrolysis reaction of a"standard"AZ91 alloy(called AZ91 in the following)in"model"seawater *** milling speeds(i.e.250 rpm and 350 rpm)were tested to enhance the reactivity of *** and AlCl_(3)were used as ball milling *** at higher rotational speed is more energetic,hence it ameliorates the most the hydrolysis performance of *** both milling additives,AlCl_(3)enhances the most the hydrolysis of AZ91 with a generation of 65%of its theoretical H_(2)generation *** best material was obtained by milling AZ91 at 350 rpm with graphite for 2 h followed by a further milling with AlCl_(3)for 2h-a yield of 75%of its theoretical H_(2)generation capacity was reached within a few *** corrosion behavior of milled AZ91 was investigated by anodic polarization and electrochemical impedance spectroscopy(EIS).The calculated electrochemical parameters from EIS fitting of two materials milled under different conditions but with the same milling additive are approximately the *** suggests that,in order to fully evaluate the reactivity of AZ91,hydrolysis,anodic polarization and EIS must be considered.

关键词： Ball milling AZ91 Mg_(17)Al_(12) Corrosion Hydrogen Electrochemical impedance spectroscopy

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