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A Novel Maximum Resolved Shear Stress Gradient Criterion and Its Application for Crack Deflection Behavior in Polycrystalline Silicon Materials

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Acta Mechanica Solida Sinica 2022年第3期35卷 518-526页

作者： Yangbo Zhang Qida Liu Qun Li Yangdong Ni Yuanjie Yu jean-nicolas jaubert Eric Lajoie-Mazenc Emmanuel Boyere Metais Thomas Hong Zuo State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Key Laboratory of Environment and Control for Flight VehicleSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China Canadian Solar Inc Guelph OntarioCanada R&D Centre EDF China Tianrun Fortune Center Tower AFI 8Rm.807No.58 Dongzongbu HutongDongcheng DistrictBeijing 100005China

In this paper,a development of new resolved shear stress gradient criteria is performed for the study of crack propagation behavior in polycrystalline materials with an emphasis on the effect of slip plane and slip *** prediction of crack deflection behavior by the maximum resolved shear stress gradient criterion shows good agreement with the experimental *** study for the prediction of crack propagation behavior in poly crystalline materials by other criteria demonstrates that the maximum resolved shear stress gradient criterion is superior to other fracture *** suggests that the new criterion could be further applied for predicting the crack deflection behavior in other polycrystalline materials.

关键词： Resolved shear stress gradient Crystal plasticity Crack deflection Polycrystalline silicon

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A robust scheduling algorithm for space telescopes with unpredictable tasks

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Science China(Technological Sciences) 2021年第3期64卷 571-584页

作者： LI DaLin GU YanFeng jaubert jean LIU YuRong BAI Meng FENG Zhun School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China National Space Science Center Chinese Academy of SciencesBeijing 100190China Centre National d’Etudes Spatiales Toulouse31401France

The original preset schedule of space telescopes can be disrupted when they receive ultra-high-priority unpredictable *** main objective of this study is to observe such unpredictable tasks,the instability of which leads to failures in delivering the promises *** paper proposes a method for retaining the robustness of the original *** use space-based multi-band variable objects monitor(SVOM)mission as an example to introduce the proposed ***,the reasons for instability are discussed in *** proactive strategies are proposed to promote the robustness of the *** proactive strategies use the available windows of a given list of ***,the realistic problem of SVOM is analysed using a rescheduling algorithm based on NSGA-II experiments with SVOM scenarios showing that the two proposed strategies are effective in reducing the instability caused by unpredictable interruption.

关键词： multi-objective scheduling rescheduling robustness SVOM telescope

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一种面向动态需求的多优先级天文观测卫星任务重规划方法

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空间科学学报 2020年第3期40卷 401-407页

作者：刘勇 jaubert jean 吴海燕冯准李虎中国科学院国家空间科学中心北京100190 中国科学院大学北京100049 Centre National d'Etudes Spatiales Toulouse 31401

针对多优先级天文观测卫星任务动态规划问题,分析了高优先级任务动态插入以及未知事件中断原任务规划方案执行的情况,研究了原任务规划方案相应的动态规划问题.在关于SVOM (Space multi-band Variable Object Monitor)卫星任务规划系统... 详细信息

针对多优先级天文观测卫星任务动态规划问题,分析了高优先级任务动态插入以及未知事件中断原任务规划方案执行的情况,研究了原任务规划方案相应的动态规划问题.在关于SVOM (Space multi-band Variable Object Monitor)卫星任务规划系统的研究中,针对单星机遇目标任务重规划问题,提出一种基于滚动优化策略的任务重规划求解方案.在每个滚动周期内,优先安排高优先级动态到达任务,回滚处理原方案中受未知事件和高优先级机遇目标影响的任务,或者删除原方案中受影响的任务.目标函数综合考虑了全年卫星任务规划总时长和机遇目标的规划总时长.仿真验证结果表明,本文设计方法对于快速响应高优先级机遇目标以及提高服务质量具有一定意义.

关键词：任务规划动态需求机遇目标滚动优化策略多优先级

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Sharp Expansion of Intensive Groundwater Irrigation,Semi-Arid Environment at the Northern Bekaa Valley Lebanon

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Natural Resources 2015年第6期6卷 381-390页

作者： Ihab Jomaa Myriam Saade Sbeih Ronald jaubert Department of Irrigation and Agrometeorology Lebanese Agriculture Research InstituteZahleLebanon Graduate Institute of Geneva GenevaSwitzerland

This research focuses on the sharp expansion of groundwater irrigation in the Northern Beqaa, using Landsat satellite images and other auxiliary GIS relevant data sources. Topographic maps were used to assess the location and size of the irrigated area in the early 1960s as the initial years of agriculture expansion analysis. The first available Landsat image of the area was of the year 1972 followed with a series of accessible Landsat images until 2009. In the 1960s, agricultural practices were only limited to areas of surface water resources and open channels next to urban settlements. In the Early 1980s, farmers discovered the agricultural potential of the area. Only 3% of the area was cultivated before the 1970s. The cultivated area reached about the 20% in late 1990s. Weather conditions, shallowness of groundwater tables, low fuel costs and market opportunities have led to an agricultural boom in the area considered as prone to desertification and of low productivity by national authorities. The area is however poorly understood from its hydro geological characteristics and exposed to intensive and unsustainable use of its natural resources.

关键词： Northern Bekaa Agriculture Expansion Landsat NDVI Surface Irrigation Surface Water Sources Groundwater

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高空间分辨力3D全心脏MRI T2 mapping对心肌炎的定量评估

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国际医学放射学杂志 2021年第3期44卷 351-351页

作者： A.Bustin A.Hua G.Milotta O.jaubert R.Hajhosseiny T.F.Ismail 俞翔

摘要临床指南推荐应用T2mapping序列识别和定量心肌炎和水肿,但T2mapping为2D序列,在范围覆盖和重复屏气方面有不足之处。目的评估应用快速自由呼吸3D全心脏

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