检索结果-南通市图书馆

Promotion effect of epoxy group neighboring single-atom Cu site on acetylene hydrochlorination

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 258-262页

作者： Junchen Peng Xue Yin Dandan Dong Zhongyuan guo Qinqin Wang Minmin Liu fei He Bin Dai Chaofeng Huang School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832000China College of Chemistry&Chemical Engineering Yantai UniversityYantai 264010China School of Material Science and Engineering University of JinanJi’nan 250022China

Carbon materials have been used as the support for catalysts in the field of acetylene hydrochlorination,the influence of inevitable oxygen-containing moieties on the reaction is often ignored and the mechanism of the oxygen-doping structure remains ***,we explored the effect of the oxygen-containing group(C-O-C)in the support on the activity of single-atom dispersed Cu *** immersing the Cu single-atom catalyst in an alkaline solution,the epoxy species on the carbon support was cleaved to obtain a pure ether species while the Cu site was modified to a more electron-deficient *** turnover frequency value of Cu/O-FLP catalyst with epoxy groups was 1.6-fold higher than that of alkaline treated *** result indicated that the epoxy groups could assist adjacent single-atom Cu sites to synergistically promote the adsorption and cleavage of the reactant hydrogen chloride toward form C-OH and Cu-Cl bonds,and reduce the reaction energy *** presence of electron deficient Cu sites and ether species could induce competitive adsorption of the acetylene and hydrogen chloride,thereby reducing the activity of the *** study highlights the influence of surface oxygen species and the tunability of the support,providing the foundation for the fabrication of higher-activity Cu catalysts for acetylene hydrochlorination.

关键词： Epoxy group Acetylene hydrochlorination Single-atom Cu catalyst Synergistic dissociation

Supramolecular systems for bioapplications:recent research progress in China

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第5期67卷 1397-1441页

作者： Yue-Yang Liu xiao-Yong Yu Yu-Chen Pan Hang Yin Shuang Chao Yujie Li He Ma Minzan Zuo Kun-Xu Teng Jun-Li Hou Yong Chen Dong-Sheng guo Ruibing Wang Yuxin Pei Zhichao Pei Jiang-fei Xu xiao-Yu Hu Chunju Li Qing-Zheng Yang Leyong Wang Yu Liu Zhan-Ting Li State Key Laboratory of Organometallic Chemistry Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional MoleculesShanghai Institute of Organic ChemistryChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 200032China Department of Chemistry Fudan UniversityShanghai 200438China College of Chemistry State Key Laboratory of Elemento-Organic ChemistryCollaborative Innovation Center of Chemical Science and EngineeringNankai UniversityTianjin 300071China State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao 999078China College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China Key Lab of Organic Optoelectronics&Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Radiopharmaceuticals Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China Tianjin Key Laboratory of Structure and Performance for Functional Molecules College of ChemistryTianjin Normal UniversityTianjin 300387China State Key Laboratory of Analytical Chemistry for Life Science Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Supramolecular systems feature dynamic,reversible and stimuli-responsive characteristics,which are not easily achieved by molecular *** last decade has witnessed tremendous advances in the investigations of supramolecular systems for various bioapplications,which include drug delivery,anticancer therapy,antibacterial therapy,photodynamic therapy,photothermal therapy,combination therapy,antidotes for residual drugs or toxins,and bioimaging and ***-guest chemistry has played a key role in the development of such bioactive supramolecular systems,and natural macrocycles(such as cyclodextrins),synthetic macrocycles(such as calixarenes,cucurbit[n]urils,and pillararenes),and porous framework polymers(such as supramolecular organic frameworks and flexible organic frameworks)have been most successfully used as hosts to build different kinds of host-guest systems for attaining designed *** self-assembly of rationally designed amphiphilic molecules,macromolecules and polymers represent another important approach for the construction of supramolecular architectures with advanced *** this review,we summarize the important contributions made by Chinese researchers in this field,with emphasis on those reported in the past five years.

关键词： host-guest chemistry drug delivery anticancer and antibacterial photodynamic therapy photothermal therapy antidote transmembrane channel bioimaging and biosensing

Combination of Ultrasonic Suction and Holmium Laser for Treatment of Complicated Renal Calculi by F24 or F26 Percutaneous Renal Tract (Report of 45 cases)

在线全文

学校读者我要写书评

暂无评论

Combination of Ultrasonic Suction and Holmium Laser for Trea...

第十五届全国泌尿外科学术会议

作者： ZHANG Shu-dong, xiao Chun-lei, MA Lu-lin,HUANG Yi, WANG guo-liang, HOU xiao-fei , LU Jian, ZHAO Lei, TIAN xiao-jun 北京大学第三医院泌尿外科

Objective: To evaluate the efficacy and safety of ultrasonic suction and holmium laser for treatment of complicated renal calculi by F24 or F26 percutaneous renal tract. Methods: The study included 45 cases(26 males,1...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于多源信息融合的天然气管网风险评价

消防科学与技术 2019年第10期38卷 1470-1472页

作者：李红霞郭小飞西安科技大学管理学院

为科学客观地评价城市天然气管网的运行风险,提出基于多因素信息融合的风险评价方法。运用HAZOP识别城市天然气管网的风险因素,确定评价指标并计算指标权重;采用改进后的证据理论的加权融合算法进行计算,确定城市天然气管网的风险等级;... 详细信息

为科学客观地评价城市天然气管网的运行风险,提出基于多因素信息融合的风险评价方法。运用HAZOP识别城市天然气管网的风险因素,确定评价指标并计算指标权重;采用改进后的证据理论的加权融合算法进行计算,确定城市天然气管网的风险等级;以某市天然气管网为例验证该方法。结果显示,该市管网处于中等风险状态,而管道腐蚀与设计缺陷处于较大风险状态,应该有针对性地进行维护和管理。

关键词：信息融合风险评价证据理论天然气管网应急管理

在线全文

学校读者我要写书评

暂无评论

马克斯·韦伯的新教伦理观及探析

南京航空航天大学学报（社会科学版） 2014年第1期16卷 24-27页

作者：郭小飞南京林业大学人文与社会科学院江苏南京210037

马克斯·韦伯是德国著名的社会学家、经济学家、历史学家,也是经济伦理学的创始人之一,社会学学界视他为"社会学学科的主要奠基人之一"。韦伯有众多涉及各个学术领域的著作,其中宗教社会学是韦伯社会学的核心部分之一。研究宗教伦理对... 详细信息

马克斯·韦伯是德国著名的社会学家、经济学家、历史学家,也是经济伦理学的创始人之一,社会学学界视他为"社会学学科的主要奠基人之一"。韦伯有众多涉及各个学术领域的著作,其中宗教社会学是韦伯社会学的核心部分之一。研究宗教伦理对经济行为的影响是马克斯·韦伯的宗教社会学思想中影响最为著名,也最为透彻的。本文就韦伯新教伦理形成脉络,探讨了新教伦理与资本主义精神、资本主义发展之间的关系,并从马克思主义理论视角进行探析。

关键词：马克斯·韦伯资本主义精神新教伦理

A possible probe to neutron-skin thickness by fragment parallel momentum distribution in projectile fragmentation reactions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第6期35卷 114-119页

作者： Chun-Wang Ma Yi-Jie Duan Ya-fei guo Chun-Yuan Qiao Yu-Ting Wang Jie Pu Kai-Xuan Cheng Hui-Ling Wei College of Physics Henan Normal UniversityXinxiang 453007China Institute of Nuclear Science and Technology Henan Academy of SciencesZhengzhou 450015China

Neutron-skin thickness is a key parameter for a neutron-rich nucleus;however,it is difficult to *** the framework of the Lanzhou Quantum Molecular Dynamics(LQMD)model,a possible probe for the neutron-skin thickness(δ_(np))of neutron-rich ^(48)Ca was studied in the 140A MeV ^(48)Ca+^(9)Be projectile fragmentation reaction based on the parallel momentum distribution(p∥)of the residual fragments.A Fermi-type density distribution was employed to initiate the neutron density distributions in the LQMD simulations.A combined Gaussian function with different width parameters for the left side(Γ_(L))and the right side(Γ_(R))in the distribution was used to describe the p∥of the residual *** neutron-rich sulfur isotopes as examples,Γ_(L) shows a sensitive correlation withδ_(np) of ^(48)Ca,and is proposed as a probe for determining the neutron skin thickness of the projectile nucleus.

关键词： Neutron-skin thickness Projectile fragmentation Parallel momentum distribution Neutron-rich nucleus Quantum molecular dynamics model

Creep property and microstructural evolution of DD11 alloy under high temperature and low stress

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 810-816页

作者： Yan-fei Liu Jiang-Bo Sha Yun-Song Zhao Chen-Guang Liu Yuan-Yuan guo Jian Zhang Yu-Shi Luo School of Materials Science and Engineering Beihang UniversityBeijing100191China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing100095China

In this paper,the interrupted and ruptured creep tests were carried out in a novel second generation single crystal superalloy named DD11 at 1100℃/130 *** alloy exhibited typical creep curve including primary,steady,and tertiary three creep *** microstructural evolution at different stages of the creep were analyzed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that theγ′phases transform into rafted structure at the early stage of the steady creep and keep stable during the steady creep *** the creep goes on,the rafted structure further coarsens and the topological inversion *** addition,at the primary creep,the dislocations mainly move in theγmatrix and pile up in theγ/γ′interface since the matrix channels widen *** formation of the regular interfacial dislocation networks occurs at the early stage of the steady *** the low stress,the dominated deformation mechanism during steady creep stage is the climbing of the〈010〉type edge ***,the effect of the deformation mechanism on creep property was discussed in detail.

关键词： DD11 alloy Creep property Interrupted creep test Rafted structure Deformation mechanism

Fast X-ray imaging beamline at SSRF

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第09期 110-123页

作者： Ke Li Hong-Lan Xie Ya-Nan Fu fei-Xiang Wang guo-Hao Du Jian-Feng ji Biao Deng Ti-Qiao xiao Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences

The fast X-ray imaging beamline(BL16U2) at Shanghai Synchrotron Radiation Facility(SSRF) is a new beamline that provides X-ray micro-imaging capabilities across a wide range of time scales, spanning from 100 ps to μs and ms. This beamline has been specifically designed to facilitate the investigation of a wide range of rapid phenomena, such as the deformation and failure of materials subjected to intense dynamic loads. In addition, it enables the study of high-pressure and high-speed fuel spray processes in automotive engines. The light source of this beamline is a cryogenic permanent magnet undulator(CPMU) that is cooled by liquid nitrogen. This CPMU can generate X-ray photons within an energy range of 8.7–30 *** beamline offers two modes of operation: monochromatic beam mode with a liquid nitrogen-cooled double-crystal monochromator(DCM) and pink beam mode with the first crystal of the DCM out of the beam path. Four X-ray imaging methods were implemented in BL16U2: single-pulse ultrafast X-ray imaging, microsecond-resolved X-ray dynamic imaging, millisecond-resolved X-ray dynamic micro-CT, and high-resolution quantitative micro-CT. Furthermore, BL16U2 is equipped with various in situ impact loading systems, such as a split Hopkinson bar system, light gas gun, and fuel spray chamber. Following the completion of the final commissioning in 2021 and subsequent trial operations in 2022, the beamline has been officially available to users from 2023.

关键词：

Inversely engineered metasurfaces for independent manipulation of transmitted and reflected light fields

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 97-106页

作者： Yongjian Liu Yu Luo fei Zhang Mingbo Pu Hanlin Bao Mingfeng Xu Yinghui guo Lanting Li Xiong Li xiaoliang Ma Xiangang Luo National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of SciencesChengdu 610209China State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Tianfu Xinglong Lake Laboratory Chengdu 610299China

Independent manipulation of transmitted and reflected light fields is a key technology for the realization of multifunctional optical applications,which can be implemented based on multilayered plasmonic or supercell subwavelength ***,the former is not suitable for the optical bands,while the latter is insufficient in generating large phase ***,an adjoint-optimization-based inverse design methodology is proposed,which utilizes the polarization-selective local interference between individual meta-atoms and enables monolayer dielectric metasurfaces to decouple the wavefront of transmitted and reflected optical ***,this methodology serves to mitigate the aperiodic electromagnetic crosstalk inherent between adjacent meta-atoms,consequently leading to a significant enhancement in the performance of *** analyzed the physical mechanism of adjoint optimization and proposed the concept of phase factors,highlighting their importance in the rapid inverse design of meta-devices—an aspect often overlooked in previous *** demonstrate the feasibility and robustness of our method,we optimize monolayer metasurfaces with different initial *** devices efficiently focus and deflect x-linearly and y-linearly polarized incident light in transmission and reflection spaces,***,this methodology holds immense potential for designing multifunctional,high-performing metasurfaces that meet multiple constraints,opening up broad prospects for applications.

关键词： full-space metasurfaces adjoint optimization inverse design