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An ultra-narrow linewidth solution-processed organic laser

Light(Science & Applications) 2016年第1期5卷 660-664页

作者： Oussama Mhibik sebastien Forget Dan Ott George Venus Ivan Divliansky Leonid Glebov sebastien chénais UniversitéParis 13 Sorbonne Paris CitéLaboratoire de Physique des LasersF-93430 VilletaneuseFrance CNRS UMR 7538LPLF-93430 VilletaneuseFrance CREOL College of Optics and PhotonicsUniversity of Central FloridaP.O.Box 162700OrlandoFL 32816-2700USA

Optically pumped lasers based on solution-processed thin-film gain media have recently emerged as low-cost,broadly tunable,and versatile active photonics components that can fit any substrate and are useful for,e.g.,chemo-or biosensing or visible *** single-mode operation has been demonstrated in various resonator architectures with a large variety of gain media-including dye-doped polymers,organic semiconductors,and,more recently,hybrid perovskites-the reported linewidths are typically on the order of a fraction of a nanometer or broader,i.e.,the coherence lengths are no longer than a few millimeters,which does not enable high-resolution spectroscopy or coherent *** linewidth is fundamentally constrained by the short photon cavity lifetime in the standard resonator *** demonstrate here a novel structure for an organic thin-film solid-state laser that is based on a vertical external cavity,wherein a holographic volume Bragg grating ensures both spectral selection and output coupling in an otherwise very compact(,cm3)*** short-pulse(0.4 ns)pumping,Fourier-transform-limited laser pulses are obtained,with a full width at half-maximum linewidth of 900 MHz(1.25 pm).Using 20-ns-long pump pulses,the linewidth can be further reduced to 200 MHz(0.26 pm),which is four times above the Fourier limit and corresponds to an unprecedented coherence length of *** concept is potentially transferrable to any type of thin-film laser and can be ultimately made tunable;it also represents a very compact alternative to bulky grating systems in dye lasers.

关键词： narrow linewidth organic lasers VECSEL volume Bragg grating

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Suitability of three Ostrinia species as hosts for Macrocentrus cingulum： A comparison of their encapsulation abilities

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Insect Science 2014年第1期21卷 93-102页

作者： sebastien Havard Universit de Toulouse INP UPS EcoLab 31062 Toulouse CNRS EcoLab 31062 Toulouse France ENFA UMR5174 Laboratoire Evolution and DiversiteBiologique Universit de Toulouse CNRS UMR5174 Laboratoire Evolution and Diversit Biologique Universit Paul Sabatier Toulouse France

Two cornborer species, Ostrinia furnacalis （Lepidoptera： Crambidae） and O. nubilalis, are major corn pests in Asia and Europe, respectively. In both continents, the larval endoparasitoid Macrocentrus cingulum （Hymenoptera： Braconidae） develops on another, closely related stemborer, O. scapulalis, which feeds on mugwort and other dicotyledons. M. cingulum also emerges from O. furnacalis in Asia and （9. nubilalis in North America, but not from O. nubilalis in Europe. We assessed the ability of three populations of each of the three Ostrinia species to encapsulate foreign bodies of a size similar to that of a M. cingulum egg. We conclude that variations in encapsulation ability alone cannot account for the differences observed in the field between parasite emergence rates in these different host species and geographic areas.

关键词： cornborer encapsulation host/parasitoid Macrocentrus cingulum Ostriniaspp.

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Geochronology of the volcanic rocks in the Lu-Zong basin and its significance

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Science china Earth Sciences 2008年第10期51卷 1470-1482页

作者： David COOKE sebastien MEFFRE Centre of Excellence in Ore Deposits (CODES) University of Tasmania

The Lu-Zong (Lujiang-Zongyang) basin is one of the most important volcanic basins in the middle and lower reaches of the Yangtze River area, china. It comprises four shoshonitic volcanic units, which are, in an ascending order, the Longmenyuan, Zhuanqiao, Shuangmiao and Fushan Groups. The LA-ICP MS U-Pb zircon ages of the four units are: 134.8±1.8 Ma for the Longmenyuan Group, 134.1±1.6 Ma for the Zhuanqiao Group, 130.5±0.8 Ma for the Shuangmiao Group, and 127.1±1.2 Ma for the Fushan Group. The results indicate that all volcanic rocks in the Lu-Zong basin were formed in the Early Cretaceous from about 135 Ma to 127 Ma, lasting 8-10 Ma. There were no Jurassic volcanic activities in all the volcanic basins including the Lu-Zong basin in the middle and lower reaches of the Yangtze River area. This work has provided new chronological results for the further study and understanding of the tec- tonic, magmatic and metallogenic processes of eastern china in the Mesozoic.

关键词： zircon LA-ICP MS dating volcanic rocks geochronologic age Lu-Zong basin

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Experimental investigation and numerical modeling of the hydration operation of date fruits

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 55-71页

作者： Atef Lakoud sebastien Curet Mnasser Hassouna Ecole Superieure des Industries Alimentaires de Tunis 58 Av.Alain Savary Tunis El Khadra1003Tunisia L’UNAM Universite ONIRISCNRSGEPEAUMR 6144 site de la GeraudiereNantesF-44322France Ecole Sup´erieure des Industries Alimentaires de Tunis 58 Av.Alain Savary Tunis El Khadra1003Tunisia

Hydration represents the main unit operation in the industrial thermal process of dry *** this work,Tunisian Deglet Nour dates were hydrated experimentally at a laboratory scale by using saturated air as it is commonly undertaken in *** study focuses on the modeling of this unit operation in order to control the moisture uptake phenomenon during processing.A physic-based simplified numerical model describing moisture transfer during hydration was implemented in COMSOL rMultiphysics soft*** model considers the real geometry of dates instead of approaching the fruits by simplified *** diffusivities of two types of Deglet Nour dry dates characterized by different maturation stages were *** showed a good agreement between experimental and numerically computed values of average moisture *** profile in dates flesh was computed numerically using estimated moisture dif*** numerical model proposed in this work could be therefore employed as a predictive tool to simulate and optimize the hydration operation of dates.

关键词： Moisture diffusivity convective coefficient moisture profile.

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PerfectlyMatched Layer withMixed Spectral Elements for the Propagation of LinearizedWaterWaves

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Communications in Computational Physics 2012年第2期11卷 285-302页

作者： Gary Cohen sebastien Imperiale INRIA Domaine de VoluceauRocquencourt-BP 10578153 Le Chesnay CedexFrance

After setting a mixed formulation for the propagation of linearized water waves problem,we define its spectral element ***,in order to take into account unbounded domains,we construct absorbing perfectly matched layer for the *** approximate these perfectly matched layer by mixed spectral elements and show their stability using the“frozen coefficient”***,numerical results will prove the efficiency of the perfectly matched layer compared to classical absorbing boundary conditions.

关键词： Linearized water waves perfectly matched layer mixed finite elements

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Importing Manganese into the chloroplast： Many Membranes to Cross

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Molecular Plant 2018年第9期11卷 1109-1111页

作者： Anja Krieger-Liszkay sebastien Thomine Institute for Integrative Biology of the Cell (12BC) CEA CNRS Universite Paris-Sud Universite Paris-Saclay Gif-sur-Yvette Cedex 91198 France

Manganese （Mn） plays a wealth of roles in living systems. It is ubiquitously involved in the antioxidant response because of its ability to catalyze the dismutation of superoxide anions. In eukaryotic cells, Mn also plays a role in protein glycosylation in the secretory system. However, arguably, in photosynthetic organisms, the most important role of Mn is in the oxygen evolving complex at photosystem IL （PS Ⅱ）. Atthe global level, atmospheric oxygen is derived from the splitting of water, a reaction that relies strictly on the tetra-manganese cluster （Mn405Ca） bound to photosystem II at the lumen side of the thylakoid membrane.

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High-Order Low Dissipation Conforming Finite-Element Discretization of the Maxwell Equations

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Communications in Computational Physics 2012年第3期11卷 863-892页

作者： sebastien Jund Stephanie Salmon Eric Sonnendrucker IRMA UMR 7501 Universite de Strasbourg and CNRSand CALVI project-teamINRIA Nancy Grand Est7 rue Rene DescartesF-67084 STRASBOURG Cedex Laboratoire de Mathematiques EA 4535 Universite de ReimsU.F.R.Sciences Exactes et NaturellesMoulin de la Housse-BP 1039F-51687 REIMS cedex 2

In this paper,we study high order discretization methods for solving the Maxwell equations on hybrid triangle-quad *** have developed high order finite edge element methods coupled with different high order time schemes and we compare results and efficiency for several *** introduce in particular a class of simple high order low dissipation time schemes based on a modified Taylor expansion.

关键词： Maxwell’s equations edge finite element method mass lumping time discretization schemes

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Fluidization and Transport of Vibrated Granular Matter:A Review of Landmark and Recent Contributions

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Fluid Dynamics & Materials Processing 2024年第1期20卷 1-29页

作者： Peter Watson sebastien Vincent Bonnieu Marcello Lappa Department of Mechanical and Aerospace Engineering University of StrathclydeGlasgowUK European Space Agency European Space Research and Technology CentreNoordwijkNetherland

We present a short retrospective review of the existing literature about the dynamics of(dry)granular matter under the effect of *** main objective is the development of an integrated resource where vital information about past findings and recent discoveries is provided in a single *** attention is paid to those works where successful synthetic routes to as-yet unknown phenomena were *** landmark results are analyzed,while smoothly blending them with a history of the field and introducing possible categorizations of the prevalent *** no classification is perfect,and it is hard to distillate general properties out of specific observations or realizations,two possible ways to interpret the existing results are defined according to the type of forcing or the emerging(ensuing)regime of *** particular,first results concerning the case where vibrations and gravity are concurrent(vertical shaking)are examined,then the companion situation with vibrations perpendicular to gravity(horizontal shaking)is *** classes are introduced as follows:(1)Regimes where sand self-organizes leading to highly regular geometrical“pulsating”patterns(thin layer case);(2)Regimes where the material undergoes“fluidization”and develops an internal multicellular convective state(tick layers case);(3)Regimes where the free interface separating the sand from the overlying gas changes inclination or develops a kind a patterned configuration consisting of stable valleys and mountains or travelling waves;(4)Regimes where segregation is produced,i.e.,particles of a given size tend to be separated from the other grains(deep containers).Where possible,an analogy or parallelism is drawn with respect to the companion field of fluid-dynamics for which the assumption of“continuum”can be applied.

关键词： Granular materials vibrations fluidization flowability symmetry breaking

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Directional H^(2) Compression Algorithm: Optimisations and Application to a Discontinuous Galerkin BEM for the Helmholtz Equation

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Communications in Computational Physics 2022年第5期31卷 1585-1635页

作者： Nadir-Alexandre Messaï sebastien Pernet Abdesselam Bouguerra ONERA/DTIS Universitéfédérale de Toulouse F-31000 Toulouse France Laboratoire de Physique de la Matière et du Rayonnement(LPMR) Département de Sciences de la MatièreUniversitéde Souk-AhrasBP 155341000 Souk-AhrasAlgeria

This study aimed to specialise a directional H^(2)(DH^(2))compression to matrices arising from the discontinuous Galerkin(DG)discretisation of the hypersingular equation in *** significantfinding is an algorithm that takes a DG stiffness matrix andfinds a near-optimal DH^(2) approximation for low and high-frequency *** introduced the necessary special optimisations to make this algorithm more efficient in the case of a DG stiffness ***,an automatic parameter tuning strategy makes it easy to use and *** comparisons with a classical Boundary Element Method(BEM)show that a DG scheme combined with a DH^(2) gives better computational efficiency than a classical BEM in the case of high-order finite elements and hp heterogeneous *** results indicate that DG is suitable for an auto-adaptive context in integral equations.

关键词： Integral equation boundary element method Helmholtz equation discontinuous Galerkin directional H^(2)-matrix low-rank approximation all frequency compression algorithm

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Impact of cavity symmetry on mode suppression and increase of free spectral range in solid-state dye microlaser

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chinese Optics Letters 2007年第11期5卷 651-653页

作者： Sergei Popov sebastien Ricciardi Ari T.Friberg Sergey Sergeyev Royal Institute of Technology Stockholm 16440 Sweden Waterford Institute of Technology Waterford Ireland

We describe modeling the solid-state dye laser with the microcavity size comparable to light wavelength. Certain symmetry in the allocation of gain material leads to depletion of odd longitudinal modes that, in turn, ... 详细信息

关键词： mode Impact of cavity symmetry on mode suppression and increase of free spectral range in solid-state dye microlaser free

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