检索结果-南通市图书馆

An enantioselective formal synthesis of (-)-thujopsene

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第3期19卷 256-258页

作者： Chen Xi zhang Li jing Fang fu Qiang Bi Yu Lin Li State Key Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou University Lanzhou 730000 China

Dihydromayurone （3）, a key intermediate to synthesize （-）-thujopsene （1）, was efficient enantiocontrolled synthesized from （＋）-dihydrocarvone through 9 steps in an overall yield of 19.3%. The key step was the... 详细信息

关键词： Thujopsene Dihydromayurone Synthesis Dihydrocarvone Simmons-Smith reaction

在线全文

学校读者我要写书评

暂无评论

基于户外照明灯罩的自清洁复合膜研制

光子学报 2016年第12期45卷 90-95页

作者：付秀华范家晨张静熊仕富张于帅长春理工大学光电工程学院长春130022

根据户外照明系统自清洁功能的需求,基于光学薄膜理论,对复合膜折射率和质量配比进行了理论分析与模拟,采用电子束共蒸发技术镀制TiO_2/Al_2O_3复合膜,并对其做真空退火处理.在单晶控系统中,通过控制左右两电子枪的束流,镀制了不同质量... 详细信息

根据户外照明系统自清洁功能的需求,基于光学薄膜理论,对复合膜折射率和质量配比进行了理论分析与模拟,采用电子束共蒸发技术镀制TiO_2/Al_2O_3复合膜,并对其做真空退火处理.在单晶控系统中,通过控制左右两电子枪的束流,镀制了不同质量配比复合膜.亲水性测试和甲基橙实验表明,复合膜中TiO_2的质量配比越高,自清洁效果越好,但亲水性和可见光透过率会降低.对不同质量配比的复合膜进行了检测和分析,并通过调整质量配比来优化试验方案,结果表明,TiO_2/Al_2O_3质量配比为9:1时,该薄膜既具有自清洁亲水作用,又具较高的可见光透过率.

关键词：薄膜户外照明灯罩电子束共蒸发退火自清洁折射率质量比

Highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 50-58页

作者： Gaozhan Liu jing zhang jing Yang jinghui Chen Xingyue Xiao Xiayin Yao Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,Li5.4PS4.4Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m S cm-1and improved chemical stability is synthesized by iodine *** ultra-thin Li5.4PS4.4Cl1.4I0.2membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 mS cm-1and low areal resistance of 1.17Ω***,iodine doping could in-situ form LiI at the lithium/electrolyte interface and improve the critical current density of Li5.4PS4.4Cl1.6from 0.8 to 1.35 mA *** resultant LiCoO2/Li5.4PS4.4Cl1.4I0.2/Li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g-1and a retention of 80.5% after 1000 *** addition,the assembled LiCoO2/Li5.4PS4.4Cl1.4I0.2membrane/Li pouch cell delivers an initial discharge capacity of 110.4 mA h g-1and 80.5% capacity retention after 100 cycles.

关键词： Argyrodite electrolytes Iodine doping Ionic conductivity Stability All-solid-state lithium battery

图书信息检索中读者兴趣偏好挖掘模型的建立仿真

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

沈阳工业大学学报 2017年第2期39卷 188-192页

作者：冯静张福泉新疆师范大学图书馆乌鲁木齐830054 北京理工大学软件学院北京100081

针对传统挖掘模型对图书信息检索中读者兴趣偏好数据进行挖掘时,存在的挖掘效率低、耗时长等问题,提出基于聚类分析的读者兴趣偏好挖掘模型.采用分类索引分布树法对图书相似度与读者兴趣距离进行计算,通过兴趣因子对兴趣偏好度进行度量... 详细信息

针对传统挖掘模型对图书信息检索中读者兴趣偏好数据进行挖掘时,存在的挖掘效率低、耗时长等问题,提出基于聚类分析的读者兴趣偏好挖掘模型.采用分类索引分布树法对图书相似度与读者兴趣距离进行计算,通过兴趣因子对兴趣偏好度进行度量,并以此为基础,采用相关反馈模型Rocchio算法对读者兴趣图书检索进行扩展,引入聚类分析法建立图书信息检索中读者兴趣偏好挖掘模型.实验仿真结果表明,采用改进模型时,其挖掘效率、时间及误差均优于传统模型.

关键词：图书信息检索读者兴趣偏好挖掘模型兴趣因子兴趣距离图书相似度扩展

Dielectric-ion-conductive ZnNb2O6 layer enabling rapid desolvation and diffusion for dendrite-free Zn metal batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 693-701页

作者： Haifeng Yang Jian Wang Panpan zhang Xiaomin Cheng Qinghua Guan jing Dong Bixian Chen Lujie Jia jing zhang Yongzheng zhang Yunjian Liu Hongzhen Lin School of Materials Science and Engineering Jiangsu University i-Lab & CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Helmholtz Institute Ulm (HIU) Karlsruhe Institute of Technology (KIT) School of Materials Science and Engineering Xi'an University of Technology State Key Laboratory of Chemical Engineering East China University of Science and Technology

Rechargeable aqueous zinc-metal batteries （AZMBs） are promising candidates for large-scale energy storage systems due to their low cost and high ***,their performance and sustainability are significantly hindered by the sluggish desolvation kinetics at the electrode/electrolyte interface and the corresponding hydrogen evolution reaction where active water molecules tightly participate in the Zn（H2O）62+solvation ***,learnt from self-generated solid electrolyte interphase （SEI） in anodes,the dielectric but ion-conductive zinc niobate nanoparticles artificial layer is constructed on metallic Zn surface （ZNB@Zn）,acting as a rapid desolvation *** zincophilic and dielectric-conductive properties of ZNB layer accelerate interfacial desolvation/diffusion and suppress surface corrosion or dendrite formation,achieving uniform Zn plating/stripping behavior,as confirmed by electronic/optical microscopies and interface spectroscopical measurements together with theoretical ***,the as-prepared ZNB@Zn electrode exhibits excellent cycling stability of over 2000 h and robust reversibility （99.54%） even under high current density and depth of discharge ***,the assembled ZNB@Zn-based full cell displays high capacity-retention rate of 80.21%after 3000 cycles at 5 A g-1and outstanding rate performance up to 10 A *** large-areal pouch cell is stabilized for hundreds of cycles,highlighting the bright prospects of the dielectric but ion-conductive layer in further application of AZMBs.

关键词： Zn metal battery Dielectric artificial layer Rapid ion diffusion Zincophilic diffusion Active water inhibition

The interaction between KIF21A and KANK1 regulates dendritic morphology and synapse plasticity in neurons

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 209-223页

作者： Shi-Yan Sun Lingyun Nie jing zhang Xue Fang Hongmei Luo Chuanhai fu Zhiyi Wei Ai-Hui Tang Hefei National Research Center for Physical Sciences at the Microscale CAS Key Laboratory of Brain Function and DiseaseMinistry of Education Key Laboratory for Membrane-less Organelles and Cellular DynamicsDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina CAS Center for Excellence in Molecular Cell Sciences Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina Department of Neurobiology School of Life SciencesSouthern University of Science and TechnologyShenzhenGuangdong ProvinceChina Brain Research Center Southern University of Science and TechnologyShenzhenGuangdong ProvinceChina

Morphological alterations in dendritic spines have been linked to changes in functional communication between neurons that affect learning and ***-4 KIF21A helps organize the microtubule-actin network at the cell cortex by interacting with KANK1;however,whether KIF21A modulates dendritic structure and function in neurons remains *** this study,we found that KIF21A was distributed in a subset of dendritic spines,and that these KIF21A-positive spines were larger and more structurally plastic than KIF21A-negative ***,the interaction between KIF21A and KANK1 was found to be critical for dendritic spine morphogenesis and synaptic *** of either KIF21A or KANK1 inhibited dendritic spine morphogenesis and dendritic branching,and these deficits were fully rescued by coexpressing full-length KIF21A or KANK1,but not by proteins with mutations disrupting direct binding between KIF21A and KANK1 or binding between KANK1 and *** down KIF21A in the hippocampus of rats inhibited the amplitudes of long-term potentiation induced by high-frequency stimulation and negatively impacted the animals’cognitive *** together,our findings demonstrate the function of KIF21A in modulating spine morphology and provide insight into its role in synaptic function.

关键词： actin cytoskeleton dendrite KANK1 KIF21A microtubule spine morphology spine synaptic plasticity talin1

Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou zhang Shuo Li fu Tang jingkai zhang Yuetong Kang Hean zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

在线全文

学校读者我要写书评

暂无评论

马蔺子素在抗肿瘤方面的研究现状

中国临床药理学杂志 2017年第8期33卷 757-759页

作者：李雅静张富赓天津医科大学肿瘤医院药学部国家肿瘤临床医学研究中心天津市“肿瘤防治”重点实验室天津市恶性肿瘤临床医学研究中心天津300060 天津市环湖医院药剂科天津300350

马蔺子素是从马蔺子中提取的醌类化合物,其具有高效低毒等优点,对肺癌、头颈癌等有很好的疗效。马蔺子素是针对乏氧细胞的一类放射增敏剂,还能加速病灶的缩小,增加肿瘤全消率,降低肿瘤复发率,提高患者生存率。本文旨在通过对马蔺子素的... 详细信息

马蔺子素是从马蔺子中提取的醌类化合物,其具有高效低毒等优点,对肺癌、头颈癌等有很好的疗效。马蔺子素是针对乏氧细胞的一类放射增敏剂,还能加速病灶的缩小,增加肿瘤全消率,降低肿瘤复发率,提高患者生存率。本文旨在通过对马蔺子素的化学成分及药理作用研究情况的作一综述,为扩大该药的适应证和老药新用提供科学依据。

关键词：马蔺子素肺癌肿瘤增敏剂

在线全文

学校读者我要写书评

暂无评论

基层负担实证研究的知识图景与理论基础

党政研究 2024年第5期 105-115,M0006,M0007页

作者：张精富王玉马亮中国人民大学公共管理学院北京100872 中国人民大学国家发展与战略研究院北京100872

基层政府工作人员在政策执行中的繁重经历是社会治理中的热点话题。基于中英文期刊2001—2022年相关文献,本文对基层负担的研究特征、概念类型和理论基础进行总结分析。研究表明:基层负担研究快速增长,已有研究侧重于乡镇和村级行政组... 详细信息

基层政府工作人员在政策执行中的繁重经历是社会治理中的热点话题。基于中英文期刊2001—2022年相关文献,本文对基层负担的研究特征、概念类型和理论基础进行总结分析。研究表明:基层负担研究快速增长,已有研究侧重于乡镇和村级行政组织的负担,更为关注扶贫、乡村政策、环保、机关事务等政策领域的负担;基层负担涉及职能扩张、中心工作、内部管理多种类型;理论解释更为多元和精细,研究设计更为完善,国家与社会关系、技术治理和制度逻辑构成基层负担解释的理论基础。已有研究很好解释了基层政府负担普遍偏重的现象,但在概念的清晰性、负担表现差异化的解释等方面存在一些不足。未来的研究应当清晰界定负担的概念内涵、建构不同基层政府负担差异的理论解释,将“时间”视角带入基层负担的研究之中。

关键词：基层负担政策执行理论基础文献计量内容分析

维普期刊数据库博看期刊