检索结果-南通市图书馆

Theoretical & Applied Mechanics Letters 2020年第4期10卷 241-248页

作者： Guodong Gai Abdellah Hadjadj Sergey Kudriakov Olivier Thomine DEN-DM2S-STMF CEAUniversitéParis-SaclayFrance University of normandy INSACORIA UMR-6614 CNRS76000 RouenFrance

The presence of solid particles or water droplets in continuous fluid flow can either induce turbulence attenuation or amplification. The modification of the state of the turbulence depends on the characteristics of the particles, such as volume fraction, mean diameter, mass density, or carrier phase flow properties. In this brief review, the main physical concepts related to the most important physical aspects of turbulence modulation are summarized. Different criteria used to distinguish the enhancement or the attenuation effects of the particles on the carrier phase flows are recalled. For the interest of large-scale industrial applications, several theoretical,experimental and empirical approaches are discussed, which provides an interesting framework for the study of the effect of particles on turbulence behavior modification.

关键词： Particle-induced turbulence Turbulence modulation Physical and numerical modeling

维普期刊数据库

Cu-2.0Fe合金等温处理过程中富Fe析出相的形态演变

在线全文

学校读者我要写书评

暂无评论

金属学报 2023年第12期59卷 1665-1674页

作者：陈凯旋李宗烜王自东 Gilles Demange 陈晓华张佳伟吴雪华 Helena Zapolsky 北京科技大学、材料科学与工程学院北京100083 北京科技大学、新金属材料国家重点实验室北京100083 Group of Materials Science University of Rouen Normandy76801 Saint-Etienne du RouvrayFrance

研究了Cu-2.0Fe(质量分数,%)合金中富Fe析出相形态的演变行为及其与等温温度和保温时间的关系。结果表明,Cu-2.0Fe合金在Fe相fcc温区内的924、964和984℃保温时,富Fe相粗化并伴随着球状(纳米级)→立方状(亚微米级)→四分支花瓣状(亚微米... 详细信息

研究了Cu-2.0Fe(质量分数,%)合金中富Fe析出相形态的演变行为及其与等温温度和保温时间的关系。结果表明,Cu-2.0Fe合金在Fe相fcc温区内的924、964和984℃保温时,富Fe相粗化并伴随着球状(纳米级)→立方状(亚微米级)→四分支花瓣状(亚微米级)→多分支花瓣状(微米级)的形态演变。随着等温温度和保温时间的增加,多分支花瓣状颗粒的尺寸逐步增大,分支数量逐步增加。多分支花瓣状颗粒的长大需要吞噬周边的小颗粒,导致温度升高时纳米~亚微米级富Fe颗粒的数量密度下降。基于相场模拟的分析表明,界面能、弹性能和化学驱动力的综合作用诱发富Fe相的多重形态演变,其中四分支花瓣状颗粒长大过程中,在弹性应变能和化学驱动力相互角逐作用下,从一次分支上生长出二次分支,进而产生了多分支花瓣状的形态。

关键词：铜合金析出相形态演变材料表征相场模拟

维普期刊数据库

Diffusion and catalyst efficiency in hierarchical zeolite catalysts

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第11期7卷 1726-1742页

作者： Peng Peng Xiong-Hou Gao Zi-Feng Yan Svetlana Mintova State Key Laboratory of Heavy Oil Processing China University of Petroleum Laboratory of Catalysis and Spectrochemistry (LCS) Normandy University National Graduate School of Engineering of Caen (ENSICAEN)University of Caen (UNICAEN) French National Center for Scientific Research (CNRS) Petrochemical Research Institute China National Petroleum Company

The preparation of hierarchical zeolites with reduced diffusion limitation and enhanced catalyst efficiency has become a vital focus in the field of zeolites and porous materials chemistry within the past decades. This review will focus on the diffusion and catalyst efficiency of hierarchical zeolites and industrial catalysts. The benefits of diffusion and catalyst efficiency at two levels of hierarchies (zeolitic component level and industrial catalyst level) from a chemical reaction engineering point of view will be analysed. At zeolitic component level, three types of mesopores based on the strategies applied toward enhancing the catalyst effectiveness factor are presented:(i)‘functional mesopores’(raising effective diffusivity);(ii)‘auxiliary mesopores’(decreasing diffusion length); and (iii)‘integrated mesopores’(a combination thereof). At industrial catalyst level, location and interconnectivity among the constitutive components are *** hierarchical pore interconnectivity in multi-component zeolite based industrial catalysts is exemplified by fluid catalytic cracking and bi-functional hydroisomerization catalysts. The rational design of industrial zeolite catalysts at both hierarchical zeolitic component and catalyst body levels can be fully comprehended using the advanced in situ and/or operando spectroscopic, microscopic and diffraction techniques.

关键词： diffusion effectiveness factor pore connectivity hierarchical zeolite industrial catalyst advanced characterization

Asymmetric Hydrogen Atom Transfer Reaction of Prostereogenic Trifluoromethylated Compounds

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asymmetric Hydrogen Atom Transfer Reaction of Prostereogenic...

A Novel Technique for Evaluating Failure Probability of Random Structure

中国化学会第十四届全国氟化学会议

作者： Dominique CAHARD CNRS UMR 6014 C.O.B.R.A. Normandy University

＜正＞The synthesis of enantiopure molecules featuring a fluorine atom or a fluorinated motif at a stereogenic carbon centre has stimulated considerable *** subtle effects of fluorine atom（s）on the course of asymmet...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Mechanics 2015年第8期5卷 139-150页

作者： Seifedine Kadry Abdelkhalak El Hami American University of the Middle East Egaila Kuwait INSA of Rouen Institute Normandy University St. Etienne du Rouvray France

The purpose of this article is to develop a new methodology to evaluate the statistical characteristic of the response of structures subjecting to random excitation, by combining the Finite Element Method (FEM) with the Transforming Density Function (TDF). Uncertainty modeling of structure with random variables encourages the coupling of advanced TDF for reliability analysis to analyze problems of stochastic mechanical systems. The TDF is enthusiastically applicable in the situation where the relationship between input and output of structures is available in explicit analytical form. However, the situation is much more involved when it is necessary to perform the evaluation of implicit expression between input and output of structures through numerical models. For this aim, we propose a new technique that combines the FEM software, and the TDF method to evaluate the most important statistical parameter the Probability Density Function (PDF) of the response where the expression between input and output of structures is implicit. Once the PDF is evaluated, all other statistical parameters are derived easily. This technique is based on the numerical simulations of the FEM and the TDF by making a middleware between Finite Element software and Matlab. Some problems, range from simple to complex, of structures are analyzed using our proposed technique. Its accuracy is validated through Monte-Carlo simulation.

关键词： Random Parameter Uncertainty Transforming Density Function Finite Element Method Finite Element Software Matlab Structures

Magnesium sulfate and fetal neuroprotection: overview of clinical evidence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第12期13卷 2044-2049页

作者： Clément Chollat Stéphane Marret Institut National de la Santé et de la Recherche Médicale U1245 Genetics and Pathophysiology of Neurodevelopmental Disorders Team 4Neovasc Institute of Research and Innovation in Biomedicine Rouen School of Medicine Normandy University Department of Neonatal Intensive Care Port Royal University Hospital Department of Neonatal Pediatrics and Intensive Care and Neuropediatrics Charles-Nicolle University Hospital

Antenatal administration of magnesium sulfate is an important part of the neuroprotective strategy for preterm infants. Strong evidence from five randomized controlled trials and five meta-analyses has demonstrated that magnesium sulfate, when administered before preterm delivery, significantly reduces the risk of cerebral palsy at two years. Through secondary analyses of randomized controlled trials and other original clinical studies, this state-of-the-art review highlights the absence of serious adverse effects in both pregnant women and neonates, as well as the impact of maternal body mass index and preeclamptic status on the maternal and neonatal magnesium levels, which could influence the magnitude of the neuroprotective effect. Although antenatal magnesium sulfate is a cost-effective strategy, some practice surveys have demonstrated that the use of magnesium sulfate is not sufficient and that its use is heterogeneous, differing among different maternity wards. Since 2010, an increasing number of obstetrical societies have recommended its use to improve the neurological outcomes of preterm infants, especially the International Federation of Gynecology and Obstetrics and World Health Organization in 2015, and France in 2017. Considering the neuroprotective impact of magnesium sulfate when administered before delivery, postnatal administration should be considered, and its effects should be assessed using randomized controlled trials.

关键词： magnesium sulfate preterm birth neuroprotection cerebral palsy neurodevelopment international recommendations clinical studies meta-analysis preeclampsia cost-effectiveness

维普期刊数据库

Recent advancement in nanosized zeolites

在线全文

学校读者我要写书评

暂无评论

Recent advancement in nanosized zeolites

Sustained activation of P2X7 induces MMP-2- evoked cleavage and functional purinoceptor inhibition

第19届全国分子筛学术大会

作者： Svetlana Mintova Laboratory of Catalysis and Spectrochemistry CNRSENSICAENNormandy University School of Chemical Engineering China University of PetroleumQingdaoChina

＜正＞This presentation will review the progress made in the field of nanosized zeolites.1 A great effort has been dedicated in recent years to improving the fundamental understanding of zeolite synthesis process, with the overall aim of increasing control over the zeolite properties and structure. The latest studies on zeolite crystallization in colloidal （clear） suspensions prepared by addition of organic

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2018年第3期10卷 229-242页

作者： Christopher N. J. Young Natalia Chira Justyna Róg Rasha Al-Khalidi Magalie Benard Ludovic Galas Philippe Chan David Vaudry Krzysztof Zablocki Dariusz C. Górecki School of Allied Health Sciences Faculty of Health and Life Sciences De Montfort University Leicester LE1 5RR UK Molecular Medicine Laboratory Institute of Biomedical and Biomolecular Sciences School of Pharmacy and Biomedical Sciences University of Portsmouth Portsmouth PO1 2DT UK Laboratory of Cellular Metabolism Department of Biochemistry Nencki Institute of Experimental Biology of the Polish Academy of Sciences Pasteur Str. 02- 093 Warsaw Poland PRIMACEN Cell Imaging Platform of Normandy Inserm IBiSA and PISSARO Proteomic Platform Institute for Research and Innovation in Biomedicine University of Rouen 76821 Mont-Saint-Aignan France

P2X7 purinoceptor 支持幸存或 cytotoxicity 取决于细胞外的腺苷 triphosphate (ATP ) 刺激紧张控制它的离子隧道或 P2X7 依赖的大毛孔(LP ) 工作。管理这运作的分叉和功能的特质的机制是听说病的。在 P2X7 的持续激活触发活跃矩阵 met... 详细信息

P2X7 purinoceptor 支持幸存或 cytotoxicity 取决于细胞外的腺苷 triphosphate (ATP ) 刺激紧张控制它的离子隧道或 P2X7 依赖的大毛孔(LP ) 工作。管理这运作的分叉和功能的特质的机制是听说病的。在 P2X7 的持续激活触发活跃矩阵 metalloproteinase 的版本的地方，我们发现了一个反馈环 2 (MMP-2 ) ，它经由 MMP-2-dependent 受体劈开停止离子隧道和 LP 回答。这机制在象巨噬细胞， dystrophic myoblasts， P2X7-transfected HEK293，和人的瘤房间一样多样的房间操作。给也堵住的那项浆液出生的 MMP-2 活动受体功能，在 vivo 的 P2X7 回答可以与可渗透的 capillaries 在机关减少。因此，这机制代表 P2X7 功能的重要调整，依赖房间自治、体外的因素。确实，它与高 P2X7 表示层次在巨噬细胞和人的癌症房间从导致 ATP 的 cytotoxicity 允许避免。最后，我们证明那 P2X7 脱离在 vivo 在煽动的 dystrophic 肌肉消除了 gelatinase 活动。因此， P2X7 对手能在煽动性的疾病和癌症的治疗被用作高度有毒的 MMP 禁止者的一种选择。

关键词： P2X7 激活 MMP-2 HEK293 巨噬细胞 vivo 机制反馈环

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Preface

International Journal of Sediment Research 2021年第6期36卷 683-686页

作者： Kim Dan Nguyen Sylvain Guillou Hitoshi Tanaka Damien Pham-Van-Bang GIS HED~2 LUSAC University of Caen-Normandy Department of Civil and Environmental Engineering Tohoku University LHE-INRS Université Du Quéebec

Introduction This Special Issue of the International Journal of Sediment Research compiles 8 papers selected among more than 110 manuscripts from 15 countries presented and discussed at the 6 thInternational Conference on Estuaries and Coasts(ICEC-2018) which was held August 20-23, 2018, in Caen, *** ICEC conferences were held in 2003 in Hangzhou/China(1 st), 2006 in Guangzhou/China(2 nd), 2009 in Sendai, Japan(3 rd), 2012 in Hanoi/Vietnam(4 th),

关键词：

A Novel Dataset For Intelligent Indoor Object Detection Systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Artificial Intelligence Advances 2019年第1期1卷 52-58页

作者： Mouna Afif Riadh Ayachi Yahia Said Edwige Pissaloux Mohamed Atri Laboratory of Electronics and Microelectronics(EμE) Faculty of Sciences of MonastirUniversity of MonastirTunisia Electrical Engineering Department College of EngineeringNorthern Border UniversityArarSaudi Arabia LITIS EA4108&CNRS FR 3638University of Rouen Normandy RouenFrance

Indoor Scene understanding and indoor objects detection is a complex high-level task for automated systems applied to natural ***,such a task requires huge annotated indoor images to train and test intelligent computer vision *** of the challenging questions is to adopt and to enhance technologies to assist indoor navigation for visually impaired people(VIP)and thus improve their daily life *** paper presents a new labeled indoor object dataset elaborated with a goal of indoor object detection(useful for indoor localization and navigation tasks).This dataset consists of 8000 indoor images containing 16 different indoor landmark objects and *** originality of the annotations comes from two new facts taken into account:(1)the spatial relationships between objects present in the scene and(2)actions possible to apply to those objects(relationships between VIP and an object).This collected dataset presents many specifications and strengths as it presents various data under various lighting conditions and complex image background to ensure more robustness when training and testing objects *** proposed dataset,ready for use,provides 16 vital indoor object classes in order to contribute for indoor assistance navigation for VIP.

关键词： Indoor object detection and recognition Indoor image dataset Visually Impaired People(VIP) Idoor navigation