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Behaviour of the Stokes operators under domain perturbation Dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China Mathematics 2019年第6期62卷 1167-1174页

作者： Sylvie Monniaux aix marseille Université CNRS Centrale Marseille

Depending on the geometry of the domain, one can define—at least—three different Stokes operators with Dirichlet boundary conditions. We describe how the resolvents of these Stokes operators converge with respect to... 详细信息

关键词： domain perturbation Stokes operator Dirichlet boundary conditions

On the Contribution of Wu Wen-Tsün to Algebraic Topology

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Journal of Systems Science & Complexity 2019年第1期32卷 3-36页

作者： BRASSELET Jean-Paul I2M (CNRS)-aix-marseille university

The aim of this article is to present the contribution of Wu Wen-Tsün to Algebraic Topology and more precisely to the theory of characteristic classes. Several papers provide complete and welldocumented biography and academic career of Wu Wen-Tsün, in particular, Hudecek, 2014; O'Connor and Robertson, 2006; Wen-Tsün Wu's Academic Career, 2006; Selected works of Wen-Tsun Wu, *** author does not repeat the details provided in these papers concerning the Wu Wen-Tsün's bibliography, we will just mention people involved in the Wu Wen-Tsün's period in *** addition to Wu Wen-Tsün's papers, the Dieudonné's book(Dieudonné, 1960) provides an excellent presentation of main results of Wu Wen-Tsün in Algebraic and Differential Topology. The author will use and abuse of this book(and refer to) when *** the introduction, the author recalls mainly historical facts concerning the contribution of Wu Wen-Tsün to Algebraic Topology. The second section shows speci?cally the contribution of Wu WenTsün to the Stiefel-Whitney classes and introduces the third section, dealing with the(real) Wu *** author provides de?nition, properties as well as further developments and generalizations of the Wu classes. The fourth and ?fth sections are devoted to recent applications: In Cobordism theory and in Mathematical Physics. The author notices that Wu classes have been used as well in other domains,in particular surgery theory(Madsen and Milgram, 1979). The last section concerns the complex Wu classes and shows that the more recent Mather classes coincide with the previously de?ned complex Wu classes, that is a result from Zhou(1994)(see also Liu, 1996).This article is devoted to the contribution of Wu Wen-Tsün to the theory of Characteristic Classes,which coincides with his "French period"(1947–1951). However, speaking of Algebraic Topology, it is worthwhile to mention the important contribution of Wu Wen-Tsün to the Theory of realization of complexes or manifolds in Eucl

关键词： Algebraic topology characteristic class cobordism theory mathematical physics Wu Class

SUSY searches at ATLAS

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Frontiers of physics 2013年第3期8卷 248-256页

作者： Pascal Pralavoriot CPPM University Aix-Marseille and CNRS/IN2P3 Marseille France

Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. The ATLAS experiment at the LHC searches for signs of supersymmetry in a large variety of signatures involving events with abnormal production of missing transverse momentum, jets, leptons, third generation fermions, gauge bosons or massive long-lived particles. A summary of the most recent results obtained in these searches is presented.

关键词： supersymmetry (SUSY) ATLAS LHC

Biomimetic Autopilot Based on Minimalistic Motion Vision for Navigating along Corridors Comprising U-shaped and S-shaped Turns

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Journal of Bionic Engineering 2015年第1期12卷 47-60页

作者： Julien R. Serres Franck Ruffier aix-marseille university CNRS ISM UMR 7287 Biorobotics Lab 13288 Marseille Cedex 09 France

A bioinspired autopilot is presented, in which body saccadic and intersaceadic systems are combined. This autopilot en- ables a simulated hovercraft to travel along corridors comprising L-junctions, U-shaped and S-shaped turns, relying on mini- realistic motion vision cues alone without measuring its speed or distance from walls, in much the same way as flies and bees manage their flight in similar situations. The saccadic system responsible for avoiding frontal collisions triggers yawing body saccades with appropriately quantified angles based simply on a few local optic flow measurements, giving the angle of inci- dence with respect to a frontal wall. The simulated robot negotiates stiff bends by triggering body saccades to realign its tra- jectory, thus traveling parallel with the wall along a corridor comprising sharp turns. Direct comparison shows that the per- formance of this new body saccade-based autopilot closely resembles the behavior of a fly using similar body saccade strategy when flying along a corridor with an S-shaped turn, despite the huge differences in terms of the inertia.

关键词： optic flow collision avoidance body saccades insect flight biorobotics biomimetics

Fluorescence polarization modulation super-resolution imaging provides refined dynamics orientation processes in biological samples Sophie Brasselet

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Light(Science & Applications) 2022年第11期11卷 2564-2566页

作者： Sophie Brasselet aix marseille Univ CNRSCentrale MarseilleInstitut FresnelF-13013 MarseilleFrance

Combining polarization modulation Fourier analysis and spatial information in a joint reconstruction algorithm for polarization-resolved fluorescence imaging provides not only a gain in spatial resolution but also a s... 详细信息

关键词： polarization resolution Fluorescence

Burst mode enabled ultrafast laser inscription inside gallium arsenide

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International Journal of Extreme Manufacturing 2022年第4期4卷 179-187页

作者： Andong Wang Pol Sopeña David Grojo aix-marseille university CNRSLP3UMR734113009 MarseilleFrance

Ultrafast laser inscription(ULI)inside semiconductors offers new perspectives for 3D monolithic structures to be fabricated and new functionalities to be added in electronic and photonic ***,important challenges remain because of nonlinear effects such as strong plasma generation that distort the energy delivery at the focal point when exposing these materials to intense infrared *** to now,the successful technological demonstrations have primarily concentrated on silicon(Si).In this paper,we target at another important semiconductor:gallium arsenide(GaAs).With nonlinearities higher than those of Si,3D-machining of GaAs with femtosecond pulses becomes even ***,we show that the difficulty can be circumvented by burst-mode *** generate and apply trains of pulses at terahertz repetition rates for efficient pulse-to-pulse accumulation of laser-induced free carriers in the focal region,while avoiding an overdose of prefocal *** superior performance of burst-mode irradiation is confirmed by a comparative study conducted with infrared luminescence *** results indicate a successful reduction of the plasma density in the prefocal region so that higher pulse energy reaches the focal *** same method is applied to identify optimum irradiation conditions considering particular cases such as asymmetric pulse trains and aberrated *** 64-pulse trains,we successfully manage to cross the writing threshold providing a solution for ULI inside *** application potential is finally illustrated with a stealth dicing demonstration by taking benefit of the burst *** irradiation method opens wide possibilities for 3D structuring inside GaAs by ULI.

关键词： laser processing ultrafast laser inscription THz-repetition-rate burst semiconductors gallium arsenide

An adaptive microscope for the imaging of biological surfaces

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Light(Science & Applications) 2021年第11期10卷 2195-2206页

作者： Faris Abouakil Huicheng Meng Marie-Anne Burcklen Herve Rigneault Frederic Galland Loïc LeGoff aix marseille Univ CNRSCentrale MarseilleInstitut FresnelTuring Center for Living SystemsMarseilleFrance

Scanning fluorescence microscopes are now able to image large biological samples at high spatial and temporal *** comes at the expense of an increased light dose which is detrimental to fluorophore stability and cell *** highly reduce the light dose,we designed an adaptive scanning fluorescence microscope with a scanning scheme optimized for the unsupervised imaging of cell sheets,which underly the shape of many embryos and *** surface of the tissue is first delineated from the acquisition of a very small subset(~0.1%)of sample space,using a robust estimation *** alternative scanning strategies are then proposed to image the tissue with an improved photon budget,without loss in *** first strategy consists in scanning only a thin shell around the estimated surface of interest,allowing high reduction of light dose when the tissue is *** second strategy applies when structures of interest lie at the cell periphery(*** junctions).An iterative approach is then used to propagate scanning along cell *** demonstrate the benefit of our approach imaging live epithelia from Drosophila *** the examples shown,both approaches yield more than a 20-fold reduction in light dose-and up to more than 80-fold-compared to a full scan of the *** smart-scanning strategies can be easily implemented on most scanning fluorescent imaging *** dramatic reduction in light exposure of the sample should allow prolonged imaging of the live processes under investigation.

关键词： image curved smart

The role of plasmacytoid dendritic cells(pDCs)in immunity during viral infections and beyond

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Cellular & Molecular Immunology 2024年第9期21卷 1008-1035页

作者： Clémence Ngo Clémence Garrec Elena Tomasello Marc Dalod aix-marseille university CNRSINSERMCIMLCentre d’Immunologie de Marseille-LuminyTuring Center for Living SystemsMarseilleFrance

Type I and III interferons(IFNs)are essential for antiviral immunity and act through two different but complimentary ***,IFNs activate intracellular antimicrobial programs by triggering the upregulation of a broad repertoire of viral restriction ***,IFNs activate innate and adaptive *** of IFN production can lead to severe immune system *** is thus crucial to identify and characterize the cellular sources of IFNs,their effects,and their regulation to promote their beneficial effects and limit their detrimental effects,which can depend on the nature of the infected or diseased tissues,as we will *** dendritic cells(pDCs)can produce large amounts of all IFN subtypes during viral *** are resistant to infection by many different viruses,thus inhibiting the immune evasion mechanisms of viruses that target IFN production or their downstream ***,pDCs are considered essential for the control of viral infections and the establishment of protective immunity.A thorough bibliographical survey showed that,in most viral infections,despite being major IFN producers,pDCs are actually dispensable for host resistance,which is achieved by multiple IFN sources depending on the ***,primary innate and adaptive antiviral immune responses are only transiently affected in the absence of *** surprisingly,pDCs and their IFNs can be detrimental in some viral infections or autoimmune *** makes the conservation of pDCs during vertebrate evolution an enigma and thus raises outstanding questions about their role not only in viral infections but also in other diseases and under physiological conditions.

关键词： Interferon Plasmacytoid dendritic cells Viral infection Tissue Homeostasis

Small bowel entrapment and ureteropelvic junction disruption associated with L3 Chance fracture-dislocation

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World Journal of Clinical Cases 2016年第9期4卷 264-268页

作者： Sebastien Pesenti Benjamin Blondel Alice Faure Emilie Peltier Franck Launay Jean-Luc Jouve Pediatric Orthopaedics Hopital d'Enfants de la TimoneAix Marseille University Spine Unit Aix Marseille University Pediatric Surgery H?pital NordAix-Marseille University

Paediatric Chance fracture are rare lesions but often associated with abdominal injuries. We herein present the case of a seven years old patient who sustained an entrapment of small bowel and an ureteropelvic disruption associated with a Chance fracture and spine dislocation following a traffic accident. Initial X-rays and computed tomographic(CT) scan showed a Chance fracture with dislocation of L3 vertebra, with an incarceration of a small bowel loop in the spinal canal and a complete section of the left lumbar ureter. Paraplegia was noticed on the initial neurological examination. A posterior L2-L4 osteosynthesis was performed firstly. In a second time she underwent a sus umbilical laparotomy to release the incarcerated jejunum loop in the spinal canal. An end-toend anastomosis was performed on a JJ probe to suture the left injured ureter. One month after the traumatism, she started to complain of severe headaches related to a leakage of cerebrospinalis fluid. Three months after the traumatism there was a clear regression of the leakage. One year after the trauma, an anterior intervertebral fusion was done. At final follow-up, no neurologic recovery was noticed. In case of Chance fracture, all physicians should think about abdominal injuries even if the patient is asymptomatic. Initial abdominal CT scan and magnetic resonance imaging provide in such case crucial info for management of the spine and the associated lesions.

关键词： Chance fracture Uretero-pelvic disruption Small bowel injuries Seatbelt Dural tear