检索结果-南通市图书馆

Preparation of Dendritic Carbosilane-supported Palladium Catalyst and Its Catalytic Activity in Hydrogenation of Organic Compounds

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第10期16卷 1389-1392页

作者： chun fang li Dong Xiang li Zhi Jie ZHANG Sheng Yu FENG School of Chemistry and Chemical Engineering Shandong University Jinan 250100 School of Chemistry Chemical Engineering and Materials Shandong Normal University Jinan 250014 Institute of Chemistry Chinese Academy of Sciences Beijing 100080

The preparation of palladium complex from PdCl2·2H2O and carbosilane dendrimers with pelripheral aminopropyl groups was described. The compound obtained was characterized by IR, H NMR, X-ray photoelectron spectroscopy （XPS） and inductively coupled plasma atomic emission spectrometric （ICP-AES） spectroscopy respectively. The metal complex was employed as catalyst in hydrogenation of organic compounds. The high activity of the complex was probably due to the formation of the coordinatively unsaturated palladium.

关键词： Dendrimer complex catalysis.

Laser cladding of Ni-based alloy on stainless steel

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第z1期14卷 296-300页

作者： XUE chun-fang TIAN Xin-li TAN Yong-sheng WU Zhi-yuan Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China Key Laboratory for High Energy Density Beam Processing TechnologyGeneral Company of Aeronautics Industry Beijing 100024 China Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China

The coatings on a stainless steel substrate were conducted by laser cladding of Ni-based alloy, using a 5 kW continuous wave CO2 flow transverse laser. SEM, EDX and X-ray diffraction were used to analyze the microstructure and constituent phases of the obtained coatings by laser cladding with direct injection of the powder into the melt pool. Solidification planar, cellular and dendrite structures were observed in Ni-based alloy coating. There exists an optimum metallurgical bond between Ni-based laser cladding layer and the base material. The high hardness of the Ni-based alloy coating is attributed to the presence of M7C3-type carbides (essentially chromium-riched carbide) dispersed in the γ(Ni,Fe) phase matrix.

关键词： laser cladding Ni-based alloy microstructure

From Zn-Al layered double hydroxide to ZnO nanostructure:Gradually etching by sodium hydroxide

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 2012年第12期23卷 1415-1418页

作者： Gang Qiang Wan Dong Xiang li chun fang li Jie Xu Wan Guo Hou State Key Laboratory Base of Eco-chemical Engineering Lab of Colloids and Functional NanostructuresCollege of Chemistry and Molecular EngineeringQingdao University of Science and Technology Key Laboratory of Colloid and Interface Chemistry of Ministry of Education Shandong University

Zn-Al layered double hydroxide （LDH） was used as precursor to produce ZnO nanostructures through dissolution of aluminum hydroxide in caustic soda. The Zn-Al LDH could transform into different nanostructures of ZnO on LDH nanosheets and even pure ZnO nanorods under various NaOH concentration. The formed ZnO nanorods vertically aligned on both LDH sides. UV-vis diverse reflectance spectra show that the obtained ZnO nanorods have a band gap of approximately 3.05 eV. Such ZnO/LDH nanostructures might be used as photocatalyst in the organic pollutant decomposition.

关键词： Layered double hydroxide (LDH) ZnO Nanostructure

Synthesis and Biological Evaluation of Novel Tricyclic Oximino Derivatives as Antitumor Agents

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第1期24卷 47-53页

作者： GUO Shu-chun ZHAO Yan-fang li Rong-dong XIE li-jun YANG You-bin GONG Ping School of Pharmaceutical Engineering Shenyang Pharmaceutical University Shenyang 110016 P. R. China

A series of novel alkylthio/sulfinyl-8H-thieno[2,3-b]pyrrolizin-8-oximino derivatives Ⅴ1--Ⅷ15 were designed and synthesized as antitumor agents. Their structures were confirmed using IR, ^1H NMR, elemental analysis, and MS. The antitumor activities of all the target compounds were tested by the MTT method in vitro against Bel-7402, HT-1080, SGC-7901, and A549 Cell lines. Among them, compound Ⅵ9 displayed a promising antitumor activity superior to that of Cisplatin.

关键词： Thieno[2,3-b] pyrrolizine Synthesis Antitumor activity

Quasi-two dimensional Ruddlesden−Popper halide perovskites for laser applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第2期19卷 53-71页

作者： Kun Chen Qianpeng Zhang Yin liang Jiepeng Song chun li Shi Chen fang li Qing Zhang School of Mechanical and Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China School of Materials Science and Engineering Peking UniversityBeijing 100871China Institute of Applied Physics and Materials Engineering Macao UniversityMacao 999078China

Quasi-two-dimensional(2D)Ruddlesden‒Popper(RP)halide perovskites,as a kind of emerged two-dimensional layered materials,have recently achieved great attentions in lasing materials field owing to their large exciton binding energy,high emission yield,large optical gain,and wide-range tuning of optical *** review will introduce research progresses of RP halide perovskites for lasing applications in aspects of materials,photophysics,and devices with emphasis on emission and lasing properties tailored by the molecular composition and *** materials,structures and fabrications are introduced in the first ***,the optical transitions and amplified spontaneous emission properties are discussed from the aspects of electronic structure,exciton,gain dynamics,and interface ***,the research progresses on lasing devices are summarized and several types of lasers including VCSEL,DFB lasers,microlasers,random lasers,plasmonic lasers,and polariton lasers are *** last,the challenges and perspectives would be provided.

关键词： two-dimensional materials metal halide perovskite Ruddlesden−Popper halide perovskites lasing emission

Development and Application of lightning Protection Technologies in Power Grids of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高电压技术 2013年第10期39卷 2329-2343页

作者： GU Shanqiang CHEN Jiahong FENG Wanxing ZHAO chun fang Yuhe li Tao State Grid Electric Power Research Institute Wuhan 430074 China

In recent years,along with the rapid expansion of power grids,the increasing complication of grid structures,and the development of smart grids and energy technologies,the lightning protection of power grids becomes increasingly *** grids of China have acquired significant achievements on lightning protection technologies,which are reviewed in this paper.A technical route of lightning protection is introduced in detail; it allows us to find problems through detection and measurement of lightning,to analyze problems through evaluation and simulation of lightning,to solve problems through lightning protection measures,and to prevent problems through hazard risk warning of *** the route,the technical breakthroughs of these four aspects in China are presented,including the chinese lightning detection network(CLDN),natural lightning observations,lightning faults detection at transmission lines,lightning current measurements,progresses in lightning distribution maps,lightning fault replays,lightning hazard risk evaluations,and lightning simulated experiments,as well as novel lightning protection *** practical devices and systems corresponding to the technologies mentioned above are also introduced and *** to the progress of lightning protection technologies in recent years,despite the rapidly growing length of transmission lines in China,the lightning accident rate is controlled at a certain level.

关键词：防雷技术电网结构中国灾害风险评估电模拟实验应用技术路线防雷措施

Planning an adaptive reuse development of underutilized urban underground infrastructures:A case study of Qingdao,China

在线全文

学校读者我要写书评

暂无评论

Underground Space 2024年第1期14卷 18-33页

作者： Yong-Kang Qiao fang-Le Peng Yun-Hao Dong chun-fang Lu Research Center for Underground Space&Department of Geotechnical Engineering Tongji UniversityShanghai 200092China

Urban underground infrastructures(UUIs)are a vital component of built capital for urban ***,many cities are now home to a multitude of disused or underutilized UUIs,not least aged purpose-built underground facilities,causing a waste of valuable underground space resource *** the process of urban renewal,adaptive reuse can be an attractive solution to breathe new life into underutilized UUIs,while addressing some of the modern problems of the built environment by an economically feasible ***,there is a prevalent absence in the current literature of the overarching planning and decision-making approaches for an adaptive reuse development of underutilized *** the intention of addressing this shortfall,this paper first lays out development strategies,then sets the generic patterns for adaptive reuse of disused or underutilized *** the city of Qingdao,China as a case study,detailed planning and decision-making approaches with the aid of multi-source data and spatial analysis tools are *** is anticipated that the findings of this research will assist the adaptive reuse development of UUIs in providing theoretical guidance and empirical evidence,thereby enhancing the role of urban underground space use in contributing to urban revitalization and urban sustainability.

关键词： Urban underground infrastructures Underutilized Adaptive reuse Planning Urban renewal

Constructing highly safe and long-life calcium ion batteries based on hydratedvanadium oxide cathodes featuring a pillar structure

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 2024年第6期43卷 2597-2612页

作者： chun-fang Wang Shi-Wei Zhang Lan Huang Yuan-Min Zhu Feng liu Jian-Chuan Wang li-Ming Tan chun-Yi Zhi Cui-Ping Han Powder Metallurgy Research Institute Central South UniversityChangsha410083China Songshan Lake Materials Laboratory Dongguan 523808China Research Institute of Interdisciplinary Science and School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Calcium-ion batteries(CIBs)have generated intense interest due to the growing demand for safer,cheaper,and large-scale energy storage ***,their development is still in its infancy,owing to the lack of suitable cathodes for sustaining reversiblc Ca^(2+)intercalation/***,layered H_(2)V_(3)O_(8)(HVO)with Zn^(2+)pre-insertion(ZHVO)is reported as a high-rate and highly durable cathode material for *** existence of Zn^(2+)and H_(2)O pillars could expand the interlayer spacing up to 1.8 nm,which is favorable for the diffusion of bulky Ca^(2+).The formation of Zn-O bonds facilitates electron transfer and enhances electrical ***,the ZHVO cathode achieves superior capacity performance(213.9 mAh·g^(-1)at 0.2 A·g^(-1))and long lifespan(78.3%for 1,000 cycles at 5 A·g^(-1))compared to pristine *** functional theory(DFT)calculations revealed that Zn^(2+)moved during Ca^(2+)intercalation,thereby reducing the diffusion energy barrier and facilitating Ca^(2+)***,a safe aqueous calcium ion cell was successfully assembled.

关键词： Multivalent batteries Calcium-ion batteries Layered structure Vanadium oxide Cathode materials

Effect of hyperbaric oxygen therapy on SAS and SDS in children with ischemic encephalopathy

在线全文

学校读者我要写书评

暂无评论

Journal of Hainan Medical University 2017年第15期23卷 126-128页

作者： Pei-Yun li chun-fang li li Sun Department of Hyperbaric Oxygen Haikou People's Hospital570208

Objective: To study and analyze the effect of early psychological intervention on the scores of SAS and SDS in children with hypoxic-ischemic encephalopathy undergoing hyperbaric oxygen therapy. Methods: A total of 64 children with hypoxic - ischemic encephalopathy enrolled in our hospital from July 2015 to July 2016 and their parents were selected as study subjects. The patients were treated with hyperbaric oxygen therapy, while their parents were given early psychological intervention. By the way of increasing parents' awareness of the disease, helping parents build confidence in their children's treatment and encouraging them to participate in daily training for their children to relieve their anxiety and depression. The parents' knowledge of the disease before and during treatment, the treatment of hyperbaric oxygen therapy and the change of SAS and SDS were observed. Results: After effective intervention, the scores of SAS and SDS of 64 patients' parents were significantly lower than those before treatment. After 1 courses of intervention, the score of SAS was (43.36 ± 1.27) points, and the score of SDS was (45.22 ± 8.13) points. After 2 courses of intervention, the score of SAS was (41.07 ± 1.21) and the score of SDS was (42.35 ± 7.44) points, and parents' awareness of hypoxic-ischemic encephalopathy was significantly increased, and the differences between the two groups were statistically significant. Conclusion: Early psychological intervention on parents of children with hypoxic-ischemic encephalopathy can effectively improve the awareness of parents on the disease, so as to improve their acceptance of hyperbaric oxygen therapy;significantly reduce the parents' SAS, SDS score. It is beneficial to build a good doctor-patient and nurse-patient relationship, improve the treatment effect and shorten the treatment time.

关键词： Parents Early psychological intervention Hypoxic-ischemic encephalopathy Hyperbaric oxygen therapy The score of SAS and SDS