检索结果-南通市图书馆

Facile synthesis of Zn（Ⅱ）-doped g-C3N4 and their enhanced photocatalytic activity under visible light irradiation

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

Rare Metals 2019年第5期38卷 459-467页

作者： zhao-tian wang Jun-Li Xu Hui Zhou Xia Zhang College of Science Northeastern University

Zn(Ⅱ)-doped graphitic carbon nitride(g-C3N4)with high photodegradation activity was prepared by one facile *** morphology and structure of the prepared Zn(Ⅱ)-doped g-C3N4 were investigated,and the results showed that Zn(Ⅱ)could self-disperse during the pyrolysis process and Zn–N bond was formed between g-C3N4 and *** dope of Zn(Ⅱ)influenced the structure of *** performance of photocatalytic activity of Zn(Ⅱ)-doped g-C3 N4 series indicated that the doped g-C3N4 with a small quantity of Zn(0.10 wt%)exhibits the best photocatalytic *** photodegradation activity for methyl orange was 2 times higher than that of pure ***,the photocatalytic activity decreased with the further increased content of Zn,which may be attributed to the structure change of g-C3N4 and the interaction of Zn–N bond between Zn and ***,Zn(Ⅱ)-doped g-C3N4 showed good recycling photocatalytic stability.

关键词： Zn(Ⅱ)dope g-C3N4 Visible light irradiation Photodegradation Photocatalytic stability

Anilido-imine Zinc Complexes： Efficient Catalysts for Ring-opening Polymerization ofL-Lactide

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第1期29卷 48-50页

作者： YAO Wei CUI Ning XUE Ying-zhao LIU tian-tian wang Yan School of Resources and Environment University of Jinan Jinan 250022 P. R. China

A series of anilido-imine zinc complexes ortho-C6H4（CH：NAr）（NAr）ZnEt[Ar=2,6-Me2C6H3（2a）; Ar=2,6-Et2C6H3（2b）] was synthesized, characterized and used as catalysts for the ring-opening polymerization of L-lactide in the presence of benzyl alcohol. The effects of the structures of catalysts and reaction conditions on the reactivity were investigated. The polymerization of L-lactide initiated by each of these complexes was found to take place with a controlled manner.

关键词： Anilido-imine ligand Zinc complex Ring-opening polymerization Lactide

Diversity and dynamics of microbial communities in brown planthopper at different developmental stages revealed by high-throughput amplicon sequencing

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

Insect Science 2020年第5期27卷 883-894页

作者： Zheng-Liang wang tian-zhao wang Hang-Feng Zhu Hai-Bo Pan Xiao-Ping Yu Zhejiang Provincial Key Laboratory of Biometrology and Inspection and Quarantine College of Life SciencesChina Jiliang UniversityHangzhouChina

The microbiome associated with brown planthopper(BPH)plays an important role in mediating host health and *** of the microbial community and its structure is prerequisite for understanding the intricate symbiotic relationships between microbes and host ***,we investigated the bacterial and fungal communities of BPH at different developmental stages using high-throughput amplicon *** results revealed that both the bacterial and fungal communities were diverse and dynamic during BPH *** bacterial communities were generally richer than fungi in each developmental *** 97%similarly,19 phyla and 278 genera of bacteria were an-notated,while five fungal phyla comprising 80 genera were *** highest species richness for the bacterial communities was detected in the nymphal *** taxonomic diversity of the fungal communities in female adults was generally at a relatively higher level when compared to other developmental *** most dominant phylum of bacteria and fungi at each developmental stage all belonged to Proteobacteria and Ascomycota,re-spectively.A significantly lower abundance of bacterial genus Acinetobacter was recorded in the egg stage when compared to other developmental stages,while the dominant fun-gal genus Wallemia was more abundant in the nymph and adult stages than in the egg ***,the microbial composition differed between male and female adults,suggesting that the microbial communties In BPH were ***,our study enriches our knowledge on the microbial communities associated with BPH and will provide clues to develop potential biocontrol techniques against this rice pest.

关键词： amplicon sequencing brown planthopper dynamics microbial diversity microbiome

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

高校智慧图书馆功能结构模型构建

情报科学 2017年第8期35卷 56-61页

作者：马捷赵天缘王思吉林大学管理学院吉林长春130022 吉林大学信息资源研究中心吉林长春130022

【目的/意义】智慧服务是图书馆新型服务能力的重要构成,智慧图书馆的功能结构需要系统化分析和构建。高校图书馆服务具有鲜明的知识化、专业化特征,其智慧化建设也具有独特性,明确定位其智慧功能结构对高校智慧图书馆发展具有重要意义... 详细信息

【目的/意义】智慧服务是图书馆新型服务能力的重要构成,智慧图书馆的功能结构需要系统化分析和构建。高校图书馆服务具有鲜明的知识化、专业化特征,其智慧化建设也具有独特性,明确定位其智慧功能结构对高校智慧图书馆发展具有重要意义。【方法/过程】结合高校图书馆的服务对象及业务特点,从智慧服务、智慧建筑、智慧管理三个维度对高校智慧图书馆的功能结构进行整体设计和构建。【结果/结论】有助于高校图书馆智慧功能的整体提升,并推动高校智慧图书馆深入、系统化地发展。

关键词：高校图书馆智慧图书馆智慧功能功能构建

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

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 380-390页

作者： Yishuang Yu Jingxiao zhao Xuelin wang Hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

在线全文

学校读者我要写书评

暂无评论

电光调Q脉冲激光外差研究

中国激光 2001年第2期28卷 130-132页

作者：王春晖田兆硕王骐哈尔滨工业大学可调谐激光技术国家级重点实验室哈尔滨150001

采用高斯函数模拟电光调Q射频激励波导CO2 激光器输出脉冲激光的波形 ,在理论上研究了脉冲激光外差的波形及其傅里叶变换频谱成分 ,并在实验上测量了脉冲激光外差的波形及其傅里叶变换频谱 ,理论分析与实验结果一致。

关键词：脉冲激光外差电光调Q 射频激励波导二氧化碳激光器

Flexible molecules dedicate to release strain of inverted inorganic perovskite solar cell

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 87-93页

作者： Hongrui Sun Sanlong wang Pengyang wang Yali Liu Shanshan Qi Biao Shi Ying zhao Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center State Key Laboratory of Photovoltaic Materials and CellsNankai University Key Laboratory of Photoelectronic Thin Film Devices and Technology of tianjin Haihe Laboratory of Sustainable Chemical Transformations Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (tianjin)

The tensile strain in inorganic perovskite films induced by thermal annealing is one of the primary factors contributing to the inefficiency and instability of inorganic perovskite solar cells （IPSCs）,which reduces the defect formation ***,a flexible molecule 5-maleimidovaleric acid （5-MVA） was introduced as a strain buffer to release the residual strain of *** anhydride and carboxyl groups in 5-MVA interact strongly with the uncoordinated Pb2+through Lewis acid-base reaction,thus tightly“pull”the perovskite *** in-between soft carbon chain increased the structural flexibility of CsPbI2.85Br0.15perovskite materials,which effectively relieved the intrinsic internal strain of CsPbI2.85Br0.15,resisted the corrosion of external strain,and also reduced the formation of defects such as VIand *** addition,the introduction of 5-MVA improved crystal quality,passivated residual defects,and narrowed energy level ***,power conversion efficiency （PCE） of NiOxbased inverted IPSCs increased from 19.25% to 20.82% with the open-circuit voltage enhanced from 1.164 V to 1.230 *** release of strain also improved the stability of CsPbI2.85Br0.15perovskite films and devices.

关键词： Inverted inorganic perovskite solar cells Flexible molecules Strain release Crystallization Energy barrier High PCE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于加权1范数稀疏信号重建的DoA估计

北京邮电大学学报 2016年第5期39卷 33-36,66页

作者：赵季红马兆恬曲桦王伟华李雷雷西安邮电大学通信与信息工程学院西安710121 西安交通大学电子与信息工程学院西安710054

针对l1范数下奇异值分解的l1-SVD稀疏信号重建的波达方向估计方法存在求解量的稀疏性较差且空间谱中存在较多的伪峰,不能准确估计波达方向的问题,对接收信号矩阵进行预处理,并使用信号子空间设计权值矢量得到更好的稀疏性和更好地逼近l... 详细信息

针对l1范数下奇异值分解的l1-SVD稀疏信号重建的波达方向估计方法存在求解量的稀疏性较差且空间谱中存在较多的伪峰,不能准确估计波达方向的问题,对接收信号矩阵进行预处理,并使用信号子空间设计权值矢量得到更好的稀疏性和更好地逼近l0范数,利用得到的权值矢量对l1-SVD算法中解矢量的各个元素进行加权,以得到的加权l1范数作为最小化的目标函数进行优化.仿真结果表明,提出的算法在快拍数、正则化参数和信噪比等条件改变的情况下能有效抑制伪峰,并准确稳定地估计出波达方向.

关键词：波达方向估计矩阵预处理稀疏重构凸优化

Review of precipitation strengthening in ultrahigh-strength martensitic steel

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 256-269页

作者： Zhihao tian Chunlei Shang Chaolei Zhang Xiaoye Zhou Honghui Wu Shuize wang Guilin Wu Junheng Gao Jiaming Zhu Xinping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China

Martensite is an important microstructure in ultrahigh-strength steels,and enhancing the strength of martensitic steels often involves the introduction of precipitated phases within the martensitic *** considerable research efforts devoted to this area,a systematic summary of these advancements is *** review focuses on the precipitates prevalent in ultrahigh-strength martensitic steel,primarily carbides(e.g.,MC,M_(2)C,and M_(3)C)and intermetallic compounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).The precipitation-strengthening effect of these precipitates on ultrahigh-strength martensitic steel is discussed from the aspects of heat treatment processes,microstructure of precipitate-strengthened martensite matrix,and mechanical ***,a perspective on the development of precipitation-strengthened martensitic steel is presented to contribute to the advancement of ultrahigh-strength martensitic *** review highlights significant findings,ongoing challenges,and opportunities in the development of ultrahigh-strength martensitic steel.

关键词： ultrahigh-strength martensitic steel precipitation strengthening mechanical property carbide intermetallic compound