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Silver-catalyzed three-component reaction of phenyldiazoacetate with arylamine and imine

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Chinese Journal of Catalysis 2018年第10期39卷 1594-1598页

作者： bai‐Ling chen Zhen Wang You‐Can Zhang Zhi‐Gang Zhao Zili chen Department of Chemistry Renmin University of ChinaBeijing 100872China College of Chemistry&Environment Protection Engineering Southwest University for NationalitiesChengdu 610041SichuanChina

A new method was developed to diastereoselectively synthesize polysubstituted 1,2‐diamine compounds from the reaction of diazoesters with arylamines and diaryl imines by using the dioxazoline ligand L2‐ligated silver *** Lewis acidity of the silver catalyst affected the different types of substrate diastereoselectivities;It also led to the formation of amine‐exchange side products.

关键词： Silver catalysis Carbene transfer reaction Three‐component reaction Ammonium ylide Diamine compouds

A Simplified Model for the Effect of Weld-Induced Residual Stresses on the Axial Ultimate Strength of Stiffened Plates

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Journal of Marine Science and Application 2018年第1期17卷 57-67页

作者： bai-Qiao chen C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TecnicoUniversidade de Lisboa1049-001 LisbonPortugal

The present work investigates the compressive axial ultimate strength of fillet-welded steel-plated ship structures subjected to uniaxial compression,in which the residual stresses in the welded plates are calculated by a thermo-elasto-plastic finite element analysis that is used to fit an idealized model of residual stress *** numerical results of ultimate strength based on the simplified model of residual stress show good agreement with those of various methods including the International Association of Classification Societies(IACS)Common Structural Rules(CSR),leading to the conclusion that the simplified model can be effectively used to represent the distribution of residual stresses in steel-plated structures in a wide range of engineering *** is concluded that the widths of the tension zones in the welded plates have a quasi-linear behavior with respect to the plate *** effect of residual stress on the axial strength of the stiffened plate is analyzed and discussed.

关键词： Fillet weld Finite element analysis Residual stress Ultimate strength

包容性发展视域下新时代中国基本公共服务均等化理论分析

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教学与研究 2020年第3期 46-53页

作者：白晨中国人民大学劳动人事学院北京100872

基本公共服务均等化是新时代中国政府为践行“以人民为中心”的共享发展理念而全力推进的一项重大民生工程。从全球所倡导的“包容性发展”道路来看,中国基本公共服务均等化在十多年的政策实践与创新的历程中,逐步形成了以“社会公正”... 详细信息

基本公共服务均等化是新时代中国政府为践行“以人民为中心”的共享发展理念而全力推进的一项重大民生工程。从全球所倡导的“包容性发展”道路来看,中国基本公共服务均等化在十多年的政策实践与创新的历程中,逐步形成了以“社会公正”、“财政权责”与“协同治理”为基本面向的理论架构,它为在坚持政府主责前提下,通过构建基本公共服务的央地财政共担与多元协同供给机制,切实推进基本公共服务均等化提供了重要的理论与实践指导。

关键词：包容性发展基本公共服务均等化社会公正财政权责协同治理

Disturbance Attenuation State-Feedback Control for Uncertain Interconnected Systems

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Journal of Systems Engineering and Electronics 2002年第4期13卷 66-72页

作者： chen Qi, bai Jingfeng & chen Yazhu Biomedical Instrument Institute, Shanghai Jiaotong University, Shanghai 200030, P. R. China Biomedical Instrument Institute Shanghai Jiaotong University Shanghai 200030 P. R. China

This paper studies the problem of robust H∞ control design for a class of uncertain interconnected systems via state feedback. This class of systems are described by a state space model, which contains unknown nonlinear interaction and time-varying norm-bounded parametric uncertainties in state equation. Using the Riccati-equation-based approach we design state feedback control laws, which guarantee the decentralized stability with disturbance attenuation for the interconnected uncertain systems. A simple example of an interconnected uncertain linear system is presented to illustrate the results.

关键词： Interconnected system State feedback Internal stability H~∞ control.

Scanning Tunneling Microscopy Studies of Agal Polysaccharide: Gelation of Carrageenan

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电子显微学报 1997年第6期 22-25页

作者： Lee Imshik,bai Chunli,Wang chen(Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080)

ＳｃａｎｎｉｎｇＴｕｎｎｅｌｉｎｇＭｉｃｒｏｓｃｏｐｙＳｔｕｄｉｅｓｏｆＡｇａｌＰｏｌｙｓａｃｃｈａｒｉｄｅ：ＧｅｌａｔｉｏｎｏｆＣａｒｒａｇｅｅｎａｎTXＳｃａｎｎｉｎｇＴｕｎｎｅｌｉｎｇＭｉｃｒｏｓｃｏｐｙＳｔｕｄ... 详细信息

ＳｃａｎｎｉｎｇＴｕｎｎｅｌｉｎｇＭｉｃｒｏｓｃｏｐｙＳｔｕｄｉｅｓｏｆＡｇａｌＰｏｌｙｓａｃｃｈａｒｉｄｅ：ＧｅｌａｔｉｏｎｏｆＣａｒｒａｇｅｅｎａｎTXＳｃａｎｎｉｎｇＴｕｎｎｅｌｉｎｇＭｉｃｒｏｓｃｏｐｙＳｔｕｄｉｅｓｏｆＡｇａｌＰｏｌｙｓａｃｃ...

关键词： aggregation helix polyanions chain arrangement

Terahertz generation and detection of LT-GaAs thin film photoconductive antennas excited by lasers of different wavelengths

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Chinese Physics B 2022年第2期31卷 677-680页

作者： Xin Liu Qing-Hao Meng Jing Ding Zhi-chen bai Jia-Hui Wang Cong Zhang Bo Su Cun-Lin Zhang Beijing Advanced Innovation Center for Imaging Theory and Technology Beijing Key Laboratory for Terahertz Spectroscopy and Imaging Key Laboratory of Terahertz Optoelectronics Ministry of EducationDepartment of PhysicsCapital Normal UniversityBeijing 100048China

A new method of generating and detecting terahertz waves is ***-temperature-grown gallium arsenide(LT-Ga As)thin films are prepared by etching a sacrificial layer(Al As)in a four-layer epitaxial structure constituted with LT-Ga As,Al As,Ga As,and semi-insulating gallium arsenide(SI-Ga As).The thin films are then transferred to clean silicon for fabricating the LT-Ga As thin film *** quality and transmission characteristics of the films are analyzed by an800-nm asynchronous ultrafast time domain spectroscopy system,and the degree of bonding between the film and silicon wafer is *** LT-Ga As thin film antennas for generating and detecting the terahertz waves are tested with a1550-nm femtosecond *** terahertz signal is successfully detected,proving the feasibility of this home-made LTGa As photoconductive *** work lays a foundation for studying the mechanism of terahertz wave generation in Ga As photoconductive antennas below the semiconductor band gap.

关键词： terahertz low-temperature-grown GaAs photoconductive antenna 1550-nm laser

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一种绳驱动主动介入导管研究

仪器仪表学报 2012年第11期33卷 2466-2472页

作者：陈柏张健陈笋黄震机器人技术与系统国家重点实验室哈尔滨150080 南京航空航天大学江苏省精密与微细制造技术重点实验室南京210016 上海交通大学医学院附属新华医院上海200092

针对现有介入导管能动性差、操作困难、盲区多的问题,提出了一种驱动模块外置的绳驱动主动弯曲导管设计方案,制作了主动导管样机。利用D-H参数法及几何分析法建立了导管主动弯曲头端通用正反运动学模型,分析了连续弯曲头端各个关节的工... 详细信息

针对现有介入导管能动性差、操作困难、盲区多的问题,提出了一种驱动模块外置的绳驱动主动弯曲导管设计方案,制作了主动导管样机。利用D-H参数法及几何分析法建立了导管主动弯曲头端通用正反运动学模型,分析了连续弯曲头端各个关节的工作空间,并对主动导管通过岔口的过程进行仿真分析。基于仿真分析结果,对主动导管原型样机通过岔口的过程进行实验,结果表明,该导管能依预期实现位姿调整并顺利通过岔口。表明所提出的导管主动位姿控制方案可行,数学模型正确。

关键词：主动导管绳驱动介入诊疗运动学工作空间

Zircon U-Pb age of Fengxian acid pyroclastic rocks and its enlightenment to the existence of Pan-African orogeny in the West Qinling Orogenic Belt, China

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China Geology 2019年第4期2卷 557-559页

作者： Yong Wang Yong-hong Shi bai-lin chen Ren-wen Tan Yun Gao Jing-hui Shen Laboratory of Dynamic Digenesis and Metallogenesis Institute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China China University of Geoscience(Beijing) Beijing 100083China China University of Geoscience Wuhan 430074China

*** The formation of East Gondwana and its combination with West Gondwana is a result of a series of complex orogenic events,known as Pan-African *** Northern Qinling Mountain is a microcontinent that formed on the ancient oceanic crust in the northern of Yangtze craton before *** is likely that the North Qinling,even the Yangtze craton and its surrounding oceanic crust belong to the ancient Gondwana tectonic domain and be a part of East Gondwana supercontinent(chen Q,2007).

关键词： Qinling Yangtze orogeny

Overexpression of PvWOX3a in switchgrass promotes stem development and increases plant height

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Horticulture Research 2021年第1期8卷 3506-3519页

作者： Ruijuan Yang Zhenying Wu chen bai Zhichao Sun Mengqi Wang Yuzhu Huo Hailing Zhang Yamei Wang Huapeng Zhou Shaojun Dai Wenwen Liu Chunxiang Fu Shandong Provincial Key Laboratory of Energy Genetics and CAS Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences266101 QingdaoShandongChina University of Chinese Academy of Sciences 100049 BeijingChina Shanghai Normal University 201418 ShanghaiChina Grass and Science Institute of Heilongjiang Academy of Agricultural Sciences HarbinHeilongjiangChina Key Laboratory of Bio-resource and Eco-environment of Ministry of Education College of Life SciencesSichuan University610064 ChengduChina

Switchgrass(Panicum virgatum L.)is an important perennial,noninvasive,tall ornamental grass that adds color and texture to gardens and ***,switchgrass has been considered a forage and bioenergy crop because of its vigorous growth,low-input requirements,and broad ***,we identified PvWOX3a from switchgrass,which encodes a WUSCHEL-related homeobox transcription *** overexpression of PvWOX3a in switchgrass increased stem length,internode diameter,and leaf blade length and width,all of which contributed to a 95%average increase in dry weight biomass compared with control *** one-hybrid and transient dual-luciferase assays showed that PvWOX3a can repress the expression of gibberellin 2-oxidase and cytokinin oxidase/dehydrogenase through apparently direct interaction with their promoter *** results suggested that overexpression of PvWOX3a could increase gibberellin and cytokinin levels in transgenic switchgrass plants,which promotes cell division,elongation,and vascular bundle *** also overexpressed PvWOX3a in a transgenic miR156-overexpressing switchgrass line that characteristically exhibited more tillers,thinner internodes,and narrower leaf *** transgenic switchgrass plants displayed significant increases in internode length and diameter,leaf blade width,and plant height but retained a tiller number comparable to that of plants expressing miR156 ***,the double transgenic switchgrass plants produced 174%more dry-weight biomass and 162%more solubilized sugars on average than control *** findings indicated that PvWOX3a is a viable potential genetic target for engineering improved shoot architecture and biomass yield of horticulture,fodder,and biofuel crops.

关键词： expressing blade landscape