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Coupling Effects of A Deep-Water Drilling Riser and the Platform and the Discharging Fluid Column in An Emergency Disconnect Scenario

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China Ocean Engineering 2020年第1期34卷 21-29页

作者： meng shuai CHEN Yong CHE Chi-dong State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-sea ExplorationShanghai Jiao Tong UniversityShanghai 200240China Shanghai Marine Diesel Engine Research Institute Shanghai 200240China

As drilling operations move into remote locations and extreme water depths, recoil analysis requires more careful considerations and the incidence of emergency disconnect is increased inevitably. To accurately capture the recoil dynamics of a deep-water riser in an emergency disconnect scenario, researchers typically focus on modelling the influential subsystems (e.g., the tensioner, the mud discharge and seawater refilling process) which can be solved in the preprocessing, and then the determined parameters are transmitted into an existing global riser analysis software. Distinctively, the current study devotes efforts into the coupling effects resulting from that the suspended riser reacts the platform heave motion via the tensioner system in the course of recoil and the discharging fluid column follows the oscillation of the riser in the mud discharge process. Four simulation models are established based on lumped mass method employing different formulas for the top boundary condition of the riser and the discharging flow acceleration. It demonstrates that the coupling effects discussed above can significantly affect the recoil behavior during the transition phase from initial disconnect to the final hang-off state. It is recommended to develop a fully- coupled integrated model for recoil analysis and anti-recoil control system design before extreme deep-water applications.

关键词： recoil analysis emergency disconnect coupling effect platform excitation

Putative Phosphatase UvPsr1 Is Required for Mycelial Growth, Conidiation, Stress Response and Pathogenicity in Ustilaginonidea virens

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Rice science 2020年第6期27卷 529-536页

作者： Xiong meng meng shuai Qiu Jiehua Shi Huanbin Shen Xiangling Kou Yanjun Key Laboratory of Three Gorges Regional Plant Genetics&Germplasm Enhancement/Biotechnology Research Center China Three Gorges UniversityYichang 443000China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China

Ustilaginoidea virens is the causal agent of rice false smut,which can be a highly destructive disease of *** plasma membrane phosphatase Psr1 proteins,which act as a regulator of the salinity stress response in yeast,are widely distributed across fungi,but their functional characterization is *** this study,we characterized the functions of Psr1 protein,UvPsr1,in *** of the AUvpsr1 and its complementation strain showed that UvPsr1 is required for normal mycelial growth,conidiation and tolerance to oxidative,osmotic and cell wall *** rice panicles were inoculated with the AUvpsr1 strains,no symptoms of false smut disease developed,showing that UvPSR1 also contributes to the pathogenicity of the *** deletion mutant of UvPSR1 also appeared to produce a smaller titer of toxic compounds able to inhibit elongation of the germinated *** conclusion,our results indicated that UvPsr1 is a new pathogenic factor of ***.

关键词： Psr1 rice false smut disease pathogenic factor clavicipitaceae Ustilaginoidea virens

Study of the Dynamic Characteristics of A Cone-Shaped Recovery System on Submarines for Recovering Autonomous Underwater Vehicle

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China Ocean Engineering 2020年第3期34卷 387-399页

作者： meng Ling-shuai LIN Yang GU Hai-tao SU Tsung-Chow State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Florida Atlantic University Boca RatonFL 33431USA

National navies equip their submarines with Autonomous Underwater Vehicle(AUV)*** has become an important component of submarine development in technologically-advanced *** advanced and reliable recovery systems directly improves the safety and operational efficiency of submarines equipped with *** this paper,based on aerial refueling technology,a cone-shaped recovery system with two different guiding covers(closed structure and frame structure)is applied to the *** taking the Suboff model as the research object,STAR-CCM was used to study the influence of the installation position of the recovery system,and the length of the rigid rod,on the Suboff *** was found that when the recovery system is installed in the middle and rear of the Suboff model at the same velocity and the same length of the rigid rod,the Suboff model has the good stability and less *** experiences the largest drag when being installed in the front of the rigid ***,when the recovery system is installed in the front and middle of the rigid rod,the drag increases as its length increases,and the lift decreases as its length *** with the closed structure guiding cover,the Suboff model will have less drag and better stability when the recovery system uses the frame structure guiding ***,the deflection and vibration of the rigid rod were also analyzed via mathematical theory.

关键词： cone-shaped recovery system submarine computational fluid dynamics(CFD) hydrodynamics deflection vibration

Ustilaginoidea virens: A Fungus Infects Rice Flower and Threats World Rice Production

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Rice science 2019年第4期26卷 199-206页

作者： QIU Jiehua meng shuai DENG Yizhen HUANG Shiwen KOU Yanjun State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China Guangdong Province Key Laboratory of Microbial Signals and Disease Control/Integrative Microbiology Research Centre South China Agricultural University Guangzhou 510642China

Rice false smut disease, which is caused by the fungus Ustilaginoidea virens, is currently one of the most devastating rice fungal diseases in the world. Rice false smut disease not only causes severe yield loss and grain quality reduction, but also threatens food safety due to its production of mycotoxins. In this review, the most recent progresses regarding the life cycle, infection processes, genome and genetic diversity, pathogenic gene and disease resistance in rice were summarized in order to provide theoretical basis for the control of U. virens. We also proposed some future directions and key questions that need to be addressed for a better understanding of the molecular mechanism that leads to rice false smut disease and the prospects for sustainable control of rice false smut.

关键词： Ustilaginoidea virens rice false smut disease life cycle infection process pathogenesis gene disease resistance

Heterogeneity in top management teams and outward foreign direct investment: evidenee from Chinese listed companies

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Frontiers of Business Research in China 2019年第3期13卷 344-371页

作者： shuai meng Jiayan Yan Xuebing Cao Business School Renmin University of ChinaBeijing 100872China School of Business Nanjing Audit UniversityNanjing 211815China Keele Management School Keele UniversityStaffordshire ST55BGUK

Drawing upon the knowledge-based view and team learning,we investigated how heterogeneity in top man agement teams(TMTs)in China in flue nces global expansi on *** panel data from Chinese listed firms from 2008 to 2014,we found that TMT functional background heterogeneity could positively affect firms'commitment to outward foreign direct investment(OFDI),as the diversification of TMT members can enrich the team's knowledge,facilitate efficient team learning,and enhance the decision-making capacity on overseas expansi ***,tenure heterogeneity may hinder knowledge acquisition and team learning among TMT members,hence undermining firms/OFDI commitment.

关键词： Top management teams(TMTs) Tenure heterogeneity Outward foreign direct investment(OFDI) Knowledge-based view(KBV) Team learning Multinational enterprise(MNE)

The rapid assembling of oligosaccharides by the developed HASP strategy

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Chinese Chemical Letters 2018年第1期29卷 69-72页

作者： Yunhe Wang shuai meng Tingting Yue Shuchun Li Zhongjun Li State Key Laboratory of Natural and Biomimetic Drugs Department of Chemical Biology School of Pharmaceutical Sciences Peking University

A new carrier containing three hydrophobic octadecyls was employed to improve the yield and purity of the synthesized oligosaccharides, and the applicability of hydrophobic carrier for HASP （hydrophobically assisted switching phase） was also explored. High performance liquid chromatography （HPLC） was used to analyze the purity of oligosaccharides and improve the elution efficiency. Elution system was optimized and replaced by isopropyl alcohol and water, in which the excess donor and other impurities had a better solubility than that in methanol.

关键词： Hydrophobically assisted switching phaseRapid oligosaccharide assemblyHPLCElution system

UvWhi2 Is Required for Stress Response and Pathogenicity in Ustilaginoidea virens

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Rice science 2022年第1期29卷 47-54,I0018-I0023页

作者： meng shuai QIU Jiehua XIONG meng LIU Zhiquan Jane Sadhna JAGERNATH LIN Fucheng SHI Huanbin KOU Yanjun State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 311400China Key Laboratory of Horticultural Plant Biology Ministry of Education/College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products Institute of Plant Protection and MicrobiologyZhejiang Academy of Agricultural SciencesHangzhou 310021China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products Institute of BiotechnologyZhejiang UniversityHangzhou 310058China

Some stress response-related genes have been identified in Ustilaginoidea virens,but it is not clear whether and how defects of stress responses affect the pathogenesis processes of *** this study,we identified a general stress response factor UvWHI2 as a homolog of Saccharomyces cerevisiae Whi2 in *** relative expression level of Uv Whi2 was significantly up-regulated during infection,suggesting that UvWHI2 may be involved in ***,knockout of Uv Whi2 showed decreased mycelial growth,increased conidiation in the potato sucrose medium and a defect in *** addition,the RNA-Seq and phenotypic analysis showed that UvWHI2 was involved in response to oxidative,hyperosmotic,cell wall stress and nutrient *** studies revealed that the defects of stress responses of the?Uvwhi2 mutant affected the formation of secondary spores on the nutrient limited surface and the rice surface,resulting in a significant reduction of pathogenicity of *** results suggest that UvWHI2 is necessary for fungal growth,stress responses and the formation of secondary spores in *** addition,the defects of stress responses can affect the formation of secondary spores on the rice surface,and then compromise the pathogenicity of ***.

关键词： Whi2 rice false smut Ustilaginoidea virens pathogenesis secondary spore

GaP-Based High-Efficiency Elliptical Cylinder Metasurface in Visible Light

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Chinese Physics Letters 2020年第5期37卷 98-101页

作者： shuai-meng Wang Xiao-Hong Sun De-Li Chen Fan Wu Henan Key Laboratory of Laser and Opto-electric Information Technology School of Information EngineeringZhengzhou UniversityZhengzhou 450052

Compared with the metal antenna metasurface,the dielectric metasurface has better optical characteristics and smaller ohmic loss in the optical band,which makes it *** elliptical cylindrical nanostructured antenna is designed using GaP with excellent transmission characteristics in the visible *** structure has a transmjssion efficiency of up to 0.96 in the visible light *** on the Pancharatnam-Berry(PB)phase control principle,the metasurface structure composed of the antennas is studied,and its abnormal refraction metasurface and focusing meta-lens are *** is a highly ef Rcient sub-wavelength structure,and promises great potential for the applications of circular polarization optics,nanolithography,dense storage and biophotonics.

关键词： visible cylindrical Berry

基于智能手机识别的薄层色谱法快速检测油菜籽中的叶绿素

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中国油料作物学报 2025年第1期47卷 217-225页

作者：郭梦帅李泽一肖华明吕昕梅德圣王丹姚旋郭亮胡琼陈洪魏芳中国农业科学院油料作物研究所农业农村部油料加工重点实验室湖北省油料脂质化学与营养重点实验室湖北武汉430062 华中农业大学作物遗传改良国家重点实验室湖北武汉430070 农业农村部油料作物生物学与遗传育种重点实验室湖北武汉430062 湖北洪山实验室湖北武汉430070

为高效鉴定油菜籽品质,建立一种操作简单、成本低、耗时短的油菜籽中叶绿素含量的快速检测方法。采用乙醇(95%)提取样品中的叶绿素,以石油醚(60~90℃)-丙酮-甲苯(体积比2∶1.5∶2)为展开剂,紫外线分析仪(365 nm)激发叶绿素荧光显色,用... 详细信息

为高效鉴定油菜籽品质,建立一种操作简单、成本低、耗时短的油菜籽中叶绿素含量的快速检测方法。采用乙醇(95%)提取样品中的叶绿素,以石油醚(60~90℃)-丙酮-甲苯(体积比2∶1.5∶2)为展开剂,紫外线分析仪(365 nm)激发叶绿素荧光显色,用智能手机采集荧光斑点图像,Image J软件进行荧光斑点自动识别,得到斑点面积,实现叶绿素a和叶绿素b的快速定性定量分析。该方法定量检测叶绿素a和b的线性范围为0.04~1.00 mg/m L,叶绿素a的决定系数R^(2)为0.9965,日内精密度为5.9%,日间精密度为8.6%。叶绿素b的决定系数R^(2)为0.9925,日内精密度为6.1%,日间精密度为5.6%。油菜籽中叶绿素a和叶绿素b的加标回收率分别为90.00%~91.67%和92.00%~113.00%。结果表明该方法线性关系较好,准确度良好,能快速测定油菜籽中叶绿素含量。

关键词：叶绿素薄层色谱法 Image J 智能手机定量分析