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High-elevation hypoxia impacts perinatal physiology and performance in a potential montane colonizer

Integrative Zoology 2020年第6期15卷 544-557页

作者： Jérémie SOUCHET Eric J.GANGLOFF Gaëlle MICHELI Coralie BOSSU Audrey TROCHET Romain BERTRAND Jean CLOBERT Olivier CALVEZ Albert MARTINEZ-SILVESTRE Elodie DARNET hugo le chevalier Olivier GUILLAUME Marc MOSSOLL-TORRES Laurent BARTHE Gilles POTTIER HervéPHILIPPE Fabien AUBRET Station d’Ecologie Théorique et Expérimentale du Centre National de la Recherche Scientifique MoulisFrance Department of Zoology Ohio Wesleyan UniversityDelawareOhioUSA Catalonia Reptile and Amphibian Rescue Center(CRARC) MasquefaBarcelonaSpain Bomosa Pl.Parc de la MolaLes EscaldesAndorra Pirenalia EncampAndorra Nature En Occitanie ToulouseFrance Département de Biochimie Centre Robert-CedergrenUniversitéde MontréalMontréalCanada

Climate change is generating range shifts in many organisms,notably along the elevational gradient in mountainous ***,moving up in elevation exposes organisms to lower oxygen availability,which may reduce the successful reproduction and development of oviparous *** test this possibility in an upwardcolonizing species,we artificially incubated developing embryos of the viperine snake(Natrix maura)using a split-clutch design,in conditions of extreme high elevation(hypoxia at 2877 m above sea level;72%sea-level equivalent O2 availability)or low elevation(control group;*** at 436 m above sea level).Hatching success did not differ between the two *** developing at extreme high elevation had higher heart rates and hatched earlier,resulting in hatchlings that were smaller in body size and slower swimmers compared to their siblings incubated at lower ***,post-hatching reciprocal transplant of juveniles showed that snakes which developed at extreme high elevation,when transferred back to low elevation,did not recover full performance compared to their siblings from the low elevation incubation *** results suggest that incubation at extreme high elevation,including the effects of hypoxia,will not prevent oviparous ectotherms from producing viable young,but may pose significant physiological challenges on developing offspring in *** early-life performance limitations imposed by extreme high elevation could have negative consequences on adult phenotypes,including on fitness-related traits.

关键词： developmental plasticity embryonic metabolism high-elevation hypoxia locomotor performance Natrix maura

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Diversity considerations in wideband radar detection of migrating targets in clutter

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Science China(Information Sciences) 2019年第4期62卷 31-40页

作者： Franois le chevalier Nikita PETROV Department Microwave Sensing Signals and Systems (MS3) Delft University of Technology

Wideband radars have been proposed for detection of moving targets, with unique capability of non-ambiguous detection due to range migration. Moreover, frequency diversity has long been used for mitigating the fading effects caused by target and clutter fluctuations. The real benefits of wideband radars are difficult to analyze, since they derive from the combined effects of target resolution in range, migration over successive cells of clutter, Doppler resolution and instantaneous bandwidth, and residual ambiguities in Doppler. In order to contribute to a better understanding of the benefits of agile transmissions for detection of moving targets, clutter cancelling performances of wideband radars are examined, demonstrating clear benefits from diversity on clutter and target, primarily – but not only – obtained through target migration effects. Special attention is given to long-range surveillance and tracking, and new results on detection of moving targets in clutter will be provided to demonstrate the effectiveness of these new architectures for small targets detection at long range, in difficult environments. Finally, recommendations for system designs that improve the discrimination of moving targets against fixed and diffuse clutter are presented.

关键词： radar extended target frequency diversity wideband detection target migration clutter cancelling

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Simulation and Visualisation of Functional Landscapes:Effects of the Water Resource Competition Between Plants

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Journal of Computer Science & Technology 2007年第6期22卷 835-845页

作者： Vincent le chevalier Marc Jaeger 梅兴 Paul-Henry Cournède Ecole Centrale Paris Laboratory of Applied Mathematics and Systems Grande Voie des Vignes 92295 Chatenay-MalabryFrance INRIA Futurs DigiPlante TeamCIRAD AMAPTA A-51/PS2 34398 Montpellier Cedex 5France Sino-French Laboratory LIAMA Institute of AutomationChinese Academy of Sciences

Vegetation ecosystem simulation and visualisation are challenging topics involving multidisciplinary aspects. In this paper, we present a new generic frame for the simulation of natural phenomena through manageable and interacting models. It focuses on the functional growth of large vegetal ecosystems, showing coherence for scales ranging from the individual plant to communities and with a particular attention to the effects of water resource competition between plants. The proposed approach is based on a model of plant growth in interaction with the environmental conditions. These are deduced from the climatic data （light, temperature, rainfall） and a model of soil hydrological budget. A set of layers is used to store the water resources and to build the interfaces between the environmental data and landscape components： temperature, rain, light, altitude, lakes, plant positions, biomass, cycles, etc. At the plant level, the simulation is performed for each individual by a structural-functional growth model, interacting with the plant＇s environment. Temperature is spatialised, changing according to altitude, and thus locally controls plant growth speed. The competition for water is based on a soil hydrological model taking into account rainfalls, water runoff, absorption, diffusion, percolation in soil. So far, the incoming light radiation is not studied in detail and is supposed constant. However, competition for light between plants is directly taken into account in the plant growth model. In our implementation, we propose a simple architecture for such a simulator and a simulation scheme to synchronise the water resource updating （on a temporal basis） and the plant growth cycles （determined by the sum of daily temperatures）. The visualisation techniques are based on sets of layers, allowing both morphological and functional landscape views and providing interesting tools for ecosystem management. The implementation of the proposed frame leads to encouraging resu

关键词： landscape visualisation plant growth models natural phenomena simulation water cycle models

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The Sino-French 2012 Conference in Thoracic Oncology:an international academic platform for in-depth exchange on comprehensive research

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Chinese Journal of Cancer 2013年第2期32卷 53-58页

作者： Dong-Rong Situ Philippe Dartevelle Thierry le chevalier Lan-Jun Zhang State Key Laboratory of Oncology in South China Department of Thoracic Surgery Sun Yat-sen University Cancer Center Department of Thoracic and Vascular Surgery and Heart-Lung Transplantation Marie Lannelongue Hospital Department of Lung Oncology Institute Gustave-Roussy

The Sino-French 2012 Conference in Thoracic Oncology, held November 17-18, 2012, was hosted by the Department of Thoracic Surgery at Sun Yat-sen University Cancer Center and organized in collaboration with two prestigious French hospitals: Institute Gustave Roussy and Marie Lannelongue Hospital. The conference was established by leading experts from China and France to serve as an international academic platform for sharing novel findings in basic research and valuable clinical practice experiences. Hot topics including innovation in surgical techniques, diagnosis and staging of early-stage lung cancer, minimally invasive surgery, multidisciplinary treatment of lung cancer, and progress in radiotherapy for lung cancer were explored. Highlights of the conference presentations are summarized in this report.

关键词：交换平台国际性学术肿瘤胸部中山大学外科技术实践经验

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STAP Processing without noise-only reference:requirements and solutions

STAP Processing without noise-only reference:requirements an...

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2006 CIE International Conference on Radar

作者： F. le chevalier S. Maria Scientific Director THALES Aerospace DivisionElancourtFRANCE IRISA/Universite de Rennes I RennesFRANCE

In presence of non-stationary clutter or jamming,estimation of the characteristics of noise from signals received

关键词： Adaptivity noise reference MTI STAP clutter airborne radar radar signal processing

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Isolation and Characterization of Enterococci Bacteriocinic Strains from Tunisian Fish Viscera

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Food and Nutrition Sciences 2013年第6期4卷 701-708页

作者： Migaw Sarra Ghrairi Taoufik le chevalier Patrick Brillet Benjamin Fleury Yannick Hani Khaled Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882) IFR148 ScInBioS Université de Brest Université Européenne de Bretagne IUT de Quimper 6 Rue de l’Université Quimper Cedex France. U12-ES03 Department of Biochemistry Faculty of Medicine Ibn El Jazzar University of Sousse Sousse Tunisia

A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as Enterococcus feacium species using molecular methods. Partial Amplified rDNA Restriction Analysis (partial ARDRA) with restriction enzyme HaeIII separated these isolates into distinctive group which suggest genotypic variability within enterococci strains isolated from fish viscera. The three strains GM1, GM2 and GM3 exhibited antimicrobial activity. Indeed strains have been shown to produce bacteriocins with inhibitory effect against food spoilage bacteria and pathogenic fish including Carnobacterium maltaromaticum. The molecular mass of bacteriocin, as calculated by tricine-SDS-PAGE, was found to be 4.5 kDa. All isolates were tested positive upon PCR amplification of enterocin A structural gene. Investigations of antibiotic resistance show that the isolates were mostly sensitive to several antibiotics (ampicillin, penicillin, tetracycline, gentamycine) and resistance to rifampicin. All isolates grow in esculin azide agar as a selective medium for enumeration of probiotic enterococci. This study suggests that our strains can be employed as probiotic or to improve the safety of food products.

关键词： Bacteriocins Fish Viscera Enterococcus Listeria Carnobacterium Probiotic

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CLUTTER CALIBRATION FOR SPACE-TIME AIRBORNE MTI RADARS

CLUTTER CALIBRATION FOR SPACE-TIME AIRBORNE MTI RADARS

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1996 CIE International Conference of Radar(ICR’96)

作者： F.le chevalier L.Savy F.Durniez THOMSON TCAR（THOMSON CSF Applications Radar）6 rue Nieuport78140-Velizy-Villacoublay FRANCE

＜正＞For slow target detection with airborne array radars,the ground clutter Doppler spreading due to the platform movement is a limiting factor, especially for long wavelength *** this paper,it will be shown that two procedures for slow target detection（Doppler-angle imaging or space-time processing,and movement compensation）are equivalent[2],[3],and that an original real-time procedure for antenna array calibration using clutter returns can be combined with these detection techniques to increase subclutter visibility in presence of high clutter returns.

关键词： Calibration Airborne radar Radar clutter Spaceborne radar Doppler radar Radar imaging Object detection Radar antennas Antenna arrays Radar detection

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机载雷达的空时发射与编码(英文)

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雷达科学与技术 2008年第6期6卷 411-421页

作者：弗朗索瓦.勒舍瓦利耶 Thales Aerospace Division Scientific Director Elancourt

论述远程机载雷达,阐明了宽带波形和多通道的同时需求开通了走向新的空时自适应信号与处理技术的道路,从而改进对多个地面和空中目标的探测与分类。

关键词：机载雷达空时自适应处理空时发射与编码数字波束形成

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空时自适应处理导论：雷达环境与支柱(英文)

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雷达科学与技术 2012年第4期10卷 341-351页

作者：费朗索瓦·施瓦利艾马克·蒙德哥洛享·撒威 Thales Air Operations France Thales Systèmes Aéroportés France ONERA the French Aerospace LabFrance

主要是为了说明机载雷达环境下,空时自适应处理(STAP)对于不同任务(或雷达功能)的作用与影响,包括用于地面动目标探测的空对地任务或用于探测空中目标空对空任务。特别关注的是距离多普勒域内的杂波定位,它将为STAP需求提供基准,且也用... 详细信息

主要是为了说明机载雷达环境下,空时自适应处理(STAP)对于不同任务(或雷达功能)的作用与影响,包括用于地面动目标探测的空对地任务或用于探测空中目标空对空任务。特别关注的是距离多普勒域内的杂波定位,它将为STAP需求提供基准,且也用于解释特定应用间的关键差别。由真实信号获取的典型结果用于说明预期优势。

关键词：雷达空时自适应处理地面动目标显示空对空前或后多普勒自适应性

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高分辨雷达专题简介

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中国科学：信息科学 2019年第4期49卷 505-506页

作者：龙腾刘泉华 Francois le chevalier Pramod K VARSHNEY Aly E FATHY 北京理工大学信息与电子学院 Department Microwave Sensing Signals and Systems(MS3) Delft University of Technology Department of Electrical Engineering and Computer Science Syracuse University ECE Department University of Tennessee

高分辨雷达采用宽带信号获得高距离分辨力,利用合成孔径获得高角度分辨力,可探测和精确定位目标,提供目标多维度高分辨图像及目标特征信息,用于目标分类和精细识别.在杂波和干扰环境下,高分辨雷达在目标检测、跟踪等方面具有独特优势.... 详细信息

高分辨雷达采用宽带信号获得高距离分辨力,利用合成孔径获得高角度分辨力,可探测和精确定位目标,提供目标多维度高分辨图像及目标特征信息,用于目标分类和精细识别.在杂波和干扰环境下,高分辨雷达在目标检测、跟踪等方面具有独特优势.然而这种优势受限于雷达探测威力减小、信号处理算法复杂、数据量急剧增加等因素,迫切需要通过理论和方法的创新来解决这些难题.

关键词：高分辨杂波背景

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