检索结果-南通市图书馆

Science China Chemistry 2009年第8期52卷 1090-1096页

作者： cai huaqiang ZHAO DongYuan Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Advanced Materials LaboratoryFudan UniversityShanghai 200433China

Ordered mesoporous aluminosilicate Al-SBA-15 materials with cage-like macropores have been synthesized by using micrometer-sized aluminum balls as an Al source,tetraethyl orthosilicate(TEOS) as a silica source,and triblock copolymer Pluronic P123 as a *** resulting materials were fully characterized by XRD,N2 adsorption,SEM,TEM,ICP-AES,and 27Al *** products(Al-SBA-15) have ordered two-dimensional(2-D) hexagonal mesostructures(space group p6mm).The calcined Al-SBA-15 materials exhibit disordered macropores with diameters of about 70―80 nm and ordered mesopores with a diameter of ～5 nm,a BET surface area of about 500 m2/g,Si/Al ratio of 40―80,and a ratio of tetrahedral Al to octahedral Al sites of about 2:*** combination of properties gives these materials potential applications in areas such as adsorption,catalysis and separation.

关键词： synthesis mesoporous materials aluminum balls templating Al-SBA-15

Texture of AZ31B magnesium alloy sheets produced by differential speed rolling technologies

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第5期31卷 415-419页

作者： LIU huaqiang TANG Di cai Qingwu LI Zhen National Engineering Research Center of Advanced Rolling Technology University of Science & Technology Beijing Beijing 100083 China

The effects of differential speed rolling (DSR) on the texture of AZ31B magnesium alloy sheets were investigated, which were achieved by tailoring deformation temperature, reduction, and speed ratio. The results show that the intensity of basal texture weakens with DSR. With the increase of the rolling temperature, the intensity of basal texture decreased first and then increased, which had a relation with the change of the orientation of the new grains of dynamic recrystallization during rolling. The effect of the reduction on the basal texture was made with the changing degree of sharp point of texture. With increasing the deformation at the same rolling temperature, the intensity of basal texture decreased, and the extending of contour lines decreased in the transverse direction, which was close to the circular distribution. Differential speed ratio has a greater impact on the intensity of the basal texture and has a less effect on the basal deflection. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2012.

关键词： Crystallization Deformation Dynamic recrystallization Magnesium alloys Speed

Ionization of a covalent organic framework for catalyzing the cycloaddition reaction between epoxides and carbon dioxide

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2020年第3期41卷 485-493页

作者： Yan Zhang Hui Hu Jia Ju Qianqian Yan Vasanthakumar Arumugam Xuechao Jing huaqiang cai Yanan Gao Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900SichuanChina Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources Hainan UniversityHaikou 570228HainanChina Liaocheng Luxi Polycarbonate Co.Ltd Liaocheng 252000ShandongChina

Covalent organic frameworks(COFs),with two dimensional(2D-)or three dimensional(3D-)structures,have accessible open channels or nanopores,with uniform sizes ranging from angstroms to nanometers and have emerged as an excellent and promising platform for designing catalysts or catalyst ***,a 2 D-COF grafted with a 1-alkyl-3-methylimidazolium-based ionic liquid(AMIMBr@H2 P-DHPh COF)on the channel walls was synthesized and utilized as a highly efficient heterogeneous catalyst for the chemical fixation of CO2 via a reaction with epoxides under solvent-free and co-catalyst-free *** as-synthesized AMIMBr@H2 P-DHPh COF shows excellent catalytic activity in promoting the cycloaddition reactions between epoxide and CO2;the excellent catalytic activity was maintained for up to five *** like high porosity,functional versatility,easy modification of COFs,and high catalytic activity of ionic liquids,have been realized in a single material.

关键词： Covalent organic framework Ionization CO2 Cycloaddition Heterogeneous catalyst

Dynamic intrauterine crosstalk promotes porcine embryo implantation during early pregnancy

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第8期67卷 1676-1696页

作者： Xupeng Zang Shengchen Gu Wenjing Wang Junsong Shi Jianyu Gan Qun Hu Chen Zhou Yue Ding Yanjuan He Lei Jiang Ting Gu Zheng Xu Sixiu Huang huaqiang Yang Fanming Meng Zicong Li Gengyuan cai Linjun Hong Zhenfang Wu State Key Laboratory of Swine and Poultry Breeding Industry National Engineering Research Center for Breeding Swine IndustryCollege of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642China Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding South China Agricultural UniversityGuangzhou 510642China Yunfu Subcenter of Guangdong Laboratory for Lingnan Modern Agriculture Yunfu 527300China Guangdong Key Laboratory of Animal Breeding and Nutrition Institute of Animal ScienceGuangdong Academy of Agricultural SciencesGuangzhou 510640China Key Laboratory of South China Modern Biological Seed Industry Ministry of Agriculture and Rural AffairsGuangzhou 510520China

Dynamic crosstalk between the embryo and mother is crucial during ***,we comprehensively profile the single-cell transcriptome of pig peri-implantation embryos and corresponding maternal endometrium,identifying 4 different lineages in embryos and 13 cell types in the ***-specific gene expression characterizes 4 distinct trophectoderm subpopulations,showing development from undifferentiated trophectoderm to polar and mural *** expression of genes in different types of endometrial cells illustrates their molecular response to embryos during ***,we developed a novel tool,ExtraCellTalk,generating an overall dynamic map of maternal-foetal crosstalk using uterine luminal proteins as *** cross-species comparisons,we identified a conserved RBP4/STRA6 pathway in which embryonic-derived RBP4 could target the STRA6 receptor on stromal cells to regulate the interaction with other endometrial *** results provide insight into the maternal-foetal crosstalk during embryo implantation and represent a valuable resource for further studies to improve embryo implantation.

关键词： endometrial remodeling ExtraCellTalk implantation maternal-foetal crosstalk trophoblast

Generation of 84-fs pulses from a mode-locked Tm：CNNGG disordered garnet crystal laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2018年第8期6卷 800-804页

作者： ZHONGBEN PAN YICHENG WANG YONGGUANG ZHAO HUALEI YUAN XIAOJUN DAI huaqiang cai JI EUN BAE SUN YOUNG CHOI FABIAN ROTERMUND XAVIER MATEOS JOSEP MARIA SERRES PAVEL LOIKO UWE GRIEBNER VALENTIN PETROV Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Bom-Str. 2a D-12489 Berlin Germany Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Normal University Xuzhou 221116 China Department of Physics Korea Advanced Institute of Science and Technology (KAIST) 34141 Daejeon South Korea Fisica i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS Departament de Quimica Fisica i Inorganica Universitat Rovira i Virgili (URV) Campus Sescelades E-43007 Tarragona Spain ITMO University 49 Kronverkskiy Pr. 197101 St. Petersburg Russia

A mode-locked laser based on a Tm:CNNGG disordered crystal as an active medium and a single-walled carbon nanotube saturable absorber is demonstrated, operating at a central wavelength of 2018 nm. Transformlimited 84 fs pulses are generated with an average output power of 22 mW at a repetition rate of ~90 MHz.A maximum output power of 98 mW is obtained at a slightly longer pulse duration of 114 fs.

关键词：无序晶体纳米管通讯技术发展现状

经典引领,紫气远传--“寿珍掇球”艺术创作研究

在线全文

学校读者我要写书评

暂无评论

陶瓷 2021年第6期 88-89页

作者：蔡华强蔡华强紫砂工作室江苏宜兴214200

“寿珍掇球”是民国初期制壶名家程寿珍先生的代表作品之一,也是紫砂壶经典款式“掇球壶”中的代表作品之一,对紫砂壶艺术的发展具有重要意义,深得人们喜爱。本文将通过这件由蔡华强先生制作的“寿珍掇球”具体说明这一壶型的特征,体会... 详细信息

“寿珍掇球”是民国初期制壶名家程寿珍先生的代表作品之一,也是紫砂壶经典款式“掇球壶”中的代表作品之一,对紫砂壶艺术的发展具有重要意义,深得人们喜爱。本文将通过这件由蔡华强先生制作的“寿珍掇球”具体说明这一壶型的特征,体会经典之美。

关键词：紫砂壶寿珍掇球经典艺术特征

在线全文

学校读者我要写书评

暂无评论

中职体育教学中学生足球运动兴趣培养的措施

当代教研论丛 2020年第5期7卷 115-115,136页

作者：蔡华强福州机电工程职业技术学校福建福州350009

我国在长期发展中比较注重体育事业的发展,体育教学也成为当前教育体系中不可忽视的一项内容,在中国教育体系内中职教育尤为重要,全面推动学生发展,关注学生多方面技能的提升和发展,关注足球授课。为此,本文主要针对中职体育教学中学生... 详细信息

我国在长期发展中比较注重体育事业的发展,体育教学也成为当前教育体系中不可忽视的一项内容,在中国教育体系内中职教育尤为重要,全面推动学生发展,关注学生多方面技能的提升和发展,关注足球授课。为此,本文主要针对中职体育教学中学生足球运动兴趣培养的措施展开深入探讨,希望能够对中职教育的发展带来积极影响。

关键词：中职体育教学足球运动兴趣培养措施

在线全文

学校读者我要写书评

暂无评论

新的场地确认方法——参考场地法

安全与电磁兼容 2008年第3期 75-77页

作者：崔强蔡华强中国电子技术标准化研究所

首先分析了归一化场地衰减法用于场地确认的缺点。为了克服这些缺点,CISPR 引入了新的场地确认方法——参考场地法(归一化场地衰减法的替换方法)。给出了参考场地法的原理和分析了其用于场地确认的优点。

关键词：归一化场地衰减双天线系数法参考场地法场地确认

MIL-STD-461F中拉杆天线试验布置变化对测量结果的影响

在线全文

学校读者我要写书评

暂无评论

安全与电磁兼容 2008年第5期 22-24页

作者：崔强蔡华强中国电子技术标准化研究所

给出 MIL-STD-461F 中拉杆天线试验布置的变化,然后选取有代表性的4个样品进行试验来分析拉杆天线试验布置的变化对测量结果的影响。测量结果表明,在大约5 MHz 以上频段的多个频点,依据 F 版的测量布置得到的测量结果明显小于依据 D 版... 详细信息

给出 MIL-STD-461F 中拉杆天线试验布置的变化,然后选取有代表性的4个样品进行试验来分析拉杆天线试验布置的变化对测量结果的影响。测量结果表明,在大约5 MHz 以上频段的多个频点,依据 F 版的测量布置得到的测量结果明显小于依据 D 版和 E 版的测量布置得到的结果。而对于5MHz 以下的频段,在某些频点上,依据 F 版的测量布置得到的测量结果明显大于依据 D 版和 E 版的测量布置得到的结果。

关键词：电场辐射发射试验布置测量结果 RE102

无金属、温和条件下唑的选择性N-烯基化（英文）

在线全文

学校读者我要写书评

暂无评论

有机化学 2018年第6期38卷 1493-1499页

作者：李爽向恒姜瑞航居佳焦鹏冲苑华磊孙宏滨蔡华强东北大学理学院沈阳110819 中国工程物理研究院化工材料研究所绵阳621900 四川省新材料中心成都610000

N-乙烯基唑化合物因其优异的生物活性,是医药、农药等领域中重要的活性中间体.以唑类化合物为原料,2,3-二溴丙酸甲酯为Michael受体,近室温无金属催化合成了22种具有反式烯烃基团的N-乙烯基唑化合物,其中包括15种新化合物.研究表明,该反... 详细信息

N-乙烯基唑化合物因其优异的生物活性,是医药、农药等领域中重要的活性中间体.以唑类化合物为原料,2,3-二溴丙酸甲酯为Michael受体,近室温无金属催化合成了22种具有反式烯烃基团的N-乙烯基唑化合物,其中包括15种新化合物.研究表明,该反应条件温和,普适性好,能够高效合成立体选择性的N-乙烯基唑化合物.

关键词：无金属 C-N偶联烯基化唑类立体选择性