检索结果-南通市图书馆

Transition metal-catalyzed conversion of aldehydes to ketones

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

Chinese Chemical Letters 2022年第3期33卷 1207-1226页

作者： zijuan yan Pan-Lin Shao Qing Qiang Feipeng Liu Xuchao Wang Yongjie Li Zi-Qiang Rong Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Institute of Biomedical Materials and Engineering(SIBME)Northwestern Polytechnical University(NPU)Xi'an 710072China College of Innovation and Entrepreneurship Southern University of Science and TechnologyShenzhen 518055China

Ketones are one of the most important classes of organic compounds, and widely present in various pharmacological compounds, biologically active molecules and functional materials. Over the past few decades, transition metal-catalyzed conversion of aldehydes has been found to be a powerful *** the continuous development in recent years, it has become an efficient and uncomplicated strategy for constructing ketones. There are four major mechanisms for transition metal-catalyzed ketone synthesis from aldehyde:(1) carbonyl-Heck reaction, that is 1,2-insertion of organometal species to aldehydic C=O double bond,(2) direct insertion of transition metal catalysts to aldehydic C-H bond,(3) aldehyde as acyl radical,(4) aldehyde as carbon radical acceptor. This article summarizes related reports on the transformations of aldehydes to generate corresponding ketones under different reaction conditions.

关键词： Homogeneous catalysis Transition metal catalysis Direct conversion Ketone synthesis C-H bond functionalization

在线全文

学校读者我要写书评

暂无评论

金鳟养殖中应重视的几个环节

河北渔业 2006年第11期 20-21页

作者：闫子娟青岛市城阳区海洋与渔业局山东青岛266109

金鳟(Oncorhynchus mykiss)是虹鳟的金黄色突变品系.由日本长野县水产试验场选育的品种.形体和虹鳟非常相似,体色为金黄色、体侧有红色的彩带、眼为玫瑰红色;由于肉色为橙红色,可以按卫生标准加工生鱼片,受消费者欢迎.是一个观赏和食用... 详细信息

金鳟(Oncorhynchus mykiss)是虹鳟的金黄色突变品系.由日本长野县水产试验场选育的品种.形体和虹鳟非常相似,体色为金黄色、体侧有红色的彩带、眼为玫瑰红色;由于肉色为橙红色,可以按卫生标准加工生鱼片,受消费者欢迎.是一个观赏和食用皆优的品种.

关键词：金鳟养殖突变品系卫生标准金黄色试验场长野县玫瑰红

在线全文

学校读者我要写书评

暂无评论

轻钢轻混凝土预制墙体抗剪性能研究

建筑结构 2024年第16期54卷 119-125页

作者：李东彬闫紫娟李伟龙中国建筑技术集团有限公司北京100013

为适应装配式低层住宅结构的发展要求,研发了装配式轻钢轻混凝土结构,该结构主要由轻钢轻混凝土预制墙体提供受剪能力。通过3片轻钢轻混凝土预制墙体的拟静力试验,研究了单侧模板及拼合墙体对轻钢轻混凝土预制墙体抗剪承载力、刚度和耗... 详细信息

为适应装配式低层住宅结构的发展要求,研发了装配式轻钢轻混凝土结构,该结构主要由轻钢轻混凝土预制墙体提供受剪能力。通过3片轻钢轻混凝土预制墙体的拟静力试验,研究了单侧模板及拼合墙体对轻钢轻混凝土预制墙体抗剪承载力、刚度和耗能能力的影响,结果表明:有单侧模板的预制墙体与无单侧模板的预制墙体抗剪承载力差异不大,初始刚度及刚度退化趋势基本相同。拼合预制墙体的抗剪承载力基本等同于单侧预制墙体,初始刚度及刚度退化趋势也基本相同。基于轻钢轻混凝土预制墙体试件的破坏特征提出了装配式轻钢轻混凝土预制墙体的区格等效斜压杆模型,建立了轻钢轻混凝土预制墙体的抗剪承载力计算公式。

关键词：装配式轻钢轻混凝土结构装配式低层住宅结构预制墙体抗剪承载力等效斜压杆模型

在线全文

学校读者我要写书评

暂无评论

免拆模板墙体技术发展现状与趋势

山西建筑 2022年第8期48卷 99-102页

作者：熊珍珍闫紫娟王飞中国建筑科学研究院有限公司北京100013 中国建筑技术集团有限公司北京100013 中建科技集团有限公司北京100195

免拆模板墙体技术作为一种施工简便、绿色环保,同时又能提高现浇混凝土结构工业化水平的技术,在工程中得到广泛应用。综述了国内外免拆模板墙体技术的发展现状,概述了国内相关标准的整体情况,对比分析了典型免拆模板墙体的产品构造、技... 详细信息

免拆模板墙体技术作为一种施工简便、绿色环保,同时又能提高现浇混凝土结构工业化水平的技术,在工程中得到广泛应用。综述了国内外免拆模板墙体技术的发展现状,概述了国内相关标准的整体情况,对比分析了典型免拆模板墙体的产品构造、技术特点等,展望了今后免拆模板墙体技术的发展趋势。

关键词：免拆模板外保温免拆模板空腔免拆模板

在线全文

学校读者我要写书评

暂无评论

魁蚶人工育苗及保苗的新探索

河北渔业 2007年第4期 38-39页

作者：毛雪英闫子娟邵雁群青岛市城阳区海洋与渔业局山东青岛266109

魁蚶是一种大型冷水性经济贝类，近几年随着出口量的急增，价格不断攀升，因此养殖量不断扩大，对优质苗种的需求也有增无减。基于工作经验，笔者在魁蚶人工育苗和中间保苗工作中，探索和发现了一些新问题。

关键词：人工育苗中间保苗魁蚶经济贝类工作经验出口量苗种优质

脑类器官培养技术进展及其在缺血性脑卒中损伤修复中的应用

在线全文

学校读者我要写书评

暂无评论

中华细胞与干细胞杂志（电子版） 2023年第2期13卷 121-128页

作者：赵子祯严紫娟王家传南京中医药大学附属深圳市中医院病理科深圳518033 中医院广州中医药大学第四临床医学院病理科深圳市518033

脑类器官在体外再现了部分大脑区域的生长和发育,并且在不涉及实验伦理问题的前提下,揭示了以往未知的中枢神经系统疾病机制。缺血性脑卒中的致残率和死亡率极高,目前尚无有效治疗手段。干细胞及其衍生的外泌体临床疗效局限,而脑类器官... 详细信息

脑类器官在体外再现了部分大脑区域的生长和发育,并且在不涉及实验伦理问题的前提下,揭示了以往未知的中枢神经系统疾病机制。缺血性脑卒中的致残率和死亡率极高,目前尚无有效治疗手段。干细胞及其衍生的外泌体临床疗效局限,而脑类器官展现出极大的治疗潜能。脑类器官移植治疗能够减少脑损伤面积,改善神经功能,并在一定程度上促进自身的生长。本文综述了脑类器官培养技术的最新进展,对优化其结构和功能复杂性以及延长脑类器官存活时间的培养方法进行归纳总结,探讨了脑类器官移植在缺血性脑卒中后治疗应用,为未来脑类器官的正式应用提供前临床评估。

关键词：类器官缺血性脑卒中神经修复移植再生医学

An Optimal CDG Framework for Energy Efficient WSNs

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

Chinese Journal of Electronics 2017年第1期26卷 137-144页

作者： yan Wenjie DONG Yongfeng ZHANG Suqi WANG zijuan School of Computer Science and Engineering Hebei University of Technology School of Information Engineering Tianjin University of Commerce School of Life Science Northeast Forestry University

Compressed sensing(CS) has been applied widely in Wireless sensor networks(WSNs) *** optimal Compressed data gathering(CDG) framework for energy efficient WSNs is proposed here. A novel Measurement matrix optimization algorithm(MMOA) is proposed for compressed data measurement in WSNs. Diffusion wavelet transform matrix(DWTM) is chosen for sparse representation of the compressed data. An Optimal data aggregation tree(ODAT) algorithm is presented based on CS and routing technology. MMOA is to reduce the data transmissions under the same data reconstruction ratio. DWTM is to make the original data become more sparse and to increase the compressed data reconstruction ratio. The main purpose of ODAT is to minimize the energy consumption of the whole WSNs through the CDG technology and the optimal route. We validate the efficiency of the proposed CDG framework based on MMOA, DWTM and ODAT through extensive experiments.

关键词： Wireless sensor networks(WSNs) Compressed sensing(CS) Measurement matrix Optimal data aggregation tree(ODAT)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

如意金黄散外用治疗毒虫咬伤24例

中国民族民间医药 2017年第5期26卷 97-98页

作者：陈思婷熊紫娟严张仁吴事仁王志强王万春江西中医药大学江西南昌330004 江西中医药大学附属医院江西南昌3300060

目的:观察如意金黄散外用治疗毒虫咬伤的临床疗效。方法:从我院门诊接诊的毒虫咬伤患者中,选取48例毒虫咬伤患者,随机分为治疗组和对照组各24例。治疗组用如意金黄散水调成糊状外用;对照组用季德胜蛇药片研末水调成糊状外用,观察两组肿... 详细信息

目的:观察如意金黄散外用治疗毒虫咬伤的临床疗效。方法:从我院门诊接诊的毒虫咬伤患者中,选取48例毒虫咬伤患者,随机分为治疗组和对照组各24例。治疗组用如意金黄散水调成糊状外用;对照组用季德胜蛇药片研末水调成糊状外用,观察两组肿胀、疼痛消除的时间及临床疗效。结果:治疗组愈显率为91.67%,对照组愈显率为66.67%,两组愈显率比较有统计学意义(P<0.05),且治疗组肿胀、疼痛消除时间均优于对照组(P<0.05)。结论:如意金黄散外用治疗毒虫咬伤见效快,疗效可靠,且操作简便,值得临床推广应用。

关键词：如意金黄散毒虫咬伤疗效观察

Tissue-engineered mesenchymal stem cell constructs alleviate tendinopathy by suppressing vascularization

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2024年第6期36卷 474-489页

作者： Dijun Li Jingwei Jiu Haifeng Liu Xiaojun yan Xiaoke Li Lei yan Jing Zhang zijuan Fan Songyan Li Guangyuan Du Jiao Jiao Li yanan Du Wei Liu Bin Wang Department of Orthopaedic Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou310006China Department of Orthopedics The Second Hospital of Shanxi Medical UniversityTaiyuan030001China Department of Orthopedics Affiliated Renhe Hospital of China Three Gorges UniversityYichangChina Department of Biomedical Engineering School of MedicineTsinghua-Peking Center for Life SciencesTsinghua UniversityBeijing100084China Beijing CytoNiche Biotechnology Co.Ltd Beijing10081China Department of Emergency Surgery The Affiliated Hospital of Guizhou Medical UniversityGuiyangGuizhou550001China Department of Health Statistics School of Public HealthShanxi Medical UniversityTaiyuan030001China School of Biomedical Engineering Faculty of Engineering and ITUniversity of Technology SydneySydneyNSW2007Australia

Tendinopathy leads to low-grade tissue inflammation and chronic damage,which progresses due to pathological imbalance in *** early path-ological vascularization may be a new approach in helping to regenerate tendon *** stem cell therapy and tissue engineering scaffolds have not been highly effective at treating *** this study,tissue engineered stem cells(TSCs)generated using human umbilical cord mesenchymal stem cells(hUC-MSCs)were combined with microcarrier scaffolds to limit excessive vascularization in *** preventing VEGF receptor activation through their paracrine function,TSCs reduced in vitro angiogenesis and the proliferation of vascular endothelial *** also decreased the inflammatory expression of tenocytes while promoting their anabolic and tenogenic ***,local injection of TSCs into rats with collagenase-induced tendinopathy substantially reduced early inflammation and ***,transcriptome sequencing revealed that TSCs could reduce the progression of pathological angiogenesis in tendon tissue,attributed to Rap1-mediated vascular *** may serve as a novel and practical approach for suppressing tendon vascularization,and provide a promising therapeutic agent for early-stage clinical tendinopathy.

关键词： inflammation injection vascular