检索结果-南通市图书馆

Breaking the symmetry of colloidal 2D nanoplatelets:Twist induced quantum coupling

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 10522-10529页

作者： Zahid Nazir Yingzhuo lun Jialu Li Gaoling yang Mingrui liu Shuqi Li Gang Tang Guofeng Zhang Jiawang Hong Liantuan Xiao Haizheng Zhong MIIT Key Laboratory for Low-dimensional Quantum Structure and Devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China MIIT Key Laboratory for Low-dimensional Quantum Structure and Devices School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Twist provides a new degree of freedom for nanomaterial modifications,which can provide novel physical ***,colloidal two-dimensional(2D)twisted CdSe nanoplatelets(NPLs)are successfully fabricated and their morphology can change from totally flat to edge-twisted,and then to middle-twisted with prolonged reaction *** combining experiments and corresponding theoretical analyses,we have established the length-dependent relationships between the surface energy and twist,with a critical lateral dimension of 30 *** found that the defects formed during the synthesis process play a vital role in generating intense stress that develops a strong torsion tensor around the edges,resulting in edge-twisted and final middletwisted ***,due to the geometric asymmetry of twisted NPLs,the dissymmetry factor of single particle NPLs can reach up to ***,quantum coupling occurs in middle-twisted NPLs by twisting one parent NPL into two daughter NPLs,which are structurally and electronically *** work not only further deepens our understanding of the twist mechanism of 2D NPLs during colloidal synthesis,but also opens a pathway for applications using twistronics and quantum technology.

关键词： nanoplatelets CdSe twist circular dichroism quantum coupling

基于变刚度复杂曲面模糊路径策略的飞机座舱自动化磨抛

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

工具技术 2024年第7期58卷 97-102页

作者：刘其广孙晓楠魏锦辉李论赵吉宾北京航空材料研究院股份有限公司中国航发北京航空材料研究院北京市先进运载系统结构透明件工程技术中心中国科学院沈阳自动化研究所中国科学院机器人与智能制造创新研究院辽宁科技大学机械工程与自动化学院

飞机座舱罩作为典型的复杂曲面弱刚性薄壁零件,是军用与民用飞机的重要部件,其安全与否直接关系到飞机和飞行员的安全。针对飞机座舱盖研磨抛光过程的曲面形状复杂以及刚性弱等问题,本文基于机器人自动化磨抛系统提出了一种基于自适应... 详细信息

飞机座舱罩作为典型的复杂曲面弱刚性薄壁零件,是军用与民用飞机的重要部件,其安全与否直接关系到飞机和飞行员的安全。针对飞机座舱盖研磨抛光过程的曲面形状复杂以及刚性弱等问题,本文基于机器人自动化磨抛系统提出了一种基于自适应阻抗控制策略的复杂曲面模糊路径的生成方法,并对磨抛过程的接触力进行建模与分析,引进主被动相结合的磨抛方法,对某型飞机座舱盖进行了仿真及磨抛试验分析。试验结果表明,所提出的主被动相结合的磨抛方法结合自适应阻抗控制策略能较好的适应复杂曲面模糊路径的磨抛过程,力控制精度可达±1N;提出的复杂曲面模糊路径能够满足某型飞机座舱罩的自动化磨抛工艺需求,在保证磨抛结果一致性的同时提高了磨抛效率。

关键词：飞机座舱盖研磨抛光主被动柔顺控制力控制

在线全文

学校读者我要写书评

暂无评论

我国社会应急力量的现状分析与发展思考

广东开放大学学报 2024年第2期33卷 103-111页

作者：朱海伦黄刘文静清华大学合肥公共安全研究院安徽合肥230031 安徽建筑大学安徽合肥230041

目前,我国社会应急力量已经成为国家应急救援队伍体系中的一支辅助力量。“十四五”期间,如何引导社会应急力量有序发展是学术界和实践工作者所关注的一个问题。本文采取文献研究方法,对我国社会应急力量早期研究的历史进程和主要主题... 详细信息

目前,我国社会应急力量已经成为国家应急救援队伍体系中的一支辅助力量。“十四五”期间,如何引导社会应急力量有序发展是学术界和实践工作者所关注的一个问题。本文采取文献研究方法,对我国社会应急力量早期研究的历史进程和主要主题进行了归纳总结,对最近五年的研究所形成的研究方向进行了主题归类;对国内现有社会应急力量三种主要建设模式的特点与存在问题进行了分析,并对今后我国社会应急力量的发展提出了几点思考。

关键词：社会应急力量建设模式现状分析发展思考

A compact ultra-wideband crossed-dipole antenna for 2G/3G/4G/IMT/5G customer premise equipment applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2022年第2期23卷 339-345页

作者： Jingli GUO lun CUI Ying liu Baohua SUN Xiaofeng LI Key Laboratory of Antennas and Microwave Technologies Xidian UniversityXi'an 710071China Huawei Technologies Co. Ltd.Xi’an 710075China

1 Introduction A compact ultra-wideband crossed-dipole antenna is proposed for 2G/3G/4G/IMT/5G customer premise equipment(CPE)*** arms of the crossed-dipole antenna are formed by step-shaped patches,and a wideband operation can be realized by properly selecting the order of the step-shaped patches;its bandwidth can be further enhanced by extending the end of crossed dipole *** dipole is excited by a microstrip stub that is directly connected to a coaxial ***,a slotted rectangular parasitic patch is added beneath the crossed dipoles to further support a 5G sub-6-GHz band without additional space cost.

关键词： antenna wideband dipole

在线全文

学校读者我要写书评

暂无评论

山城地区框剪结构群楼安全高效爆破拆除

爆破 2024年第1期41卷 98-105页

作者：贾永胜刘桂勇黄小武刘伦志伍岳陈港江汉大学精细爆破国家重点实验室武汉430056 武汉爆破有限公司武汉430056 重庆市公安局治安总队重庆401147 云阳县公安局治安大队云阳404500

山城地区的房屋大多依山而建,具有地势高低不平、建筑布置错落和周边环境复杂等特点。重庆市某地区有10栋框剪结构违章建筑需要拆除,因施工安全、进度等要求,确定选用单切口定向爆破拆除方式。结合爆破拆除工程实践,根据10栋违建群楼的... 详细信息

山城地区的房屋大多依山而建,具有地势高低不平、建筑布置错落和周边环境复杂等特点。重庆市某地区有10栋框剪结构违章建筑需要拆除,因施工安全、进度等要求,确定选用单切口定向爆破拆除方式。结合爆破拆除工程实践,根据10栋违建群楼的平面位置、空间分布特点和周边环境,提出了相应的总体爆破方案,优化施工组织,在15 d内分3次安全高效地完成了群楼爆破拆除任务。针对影响楼房倒塌及爆破效果的高陡岩质边坡、山谷和陡坎等环境因素,通过优化爆破切口、预留缓冲层,合理设计爆破孔网参数等技术手段,可靠保证了楼房的定向倒塌。通过合理设计起爆网路的分区和延时,并高效地组织组网连接操作,实现了大规模工业电子雷管同网延时可靠起爆。最终有效控制了楼房的倒塌堆积范围和爆破有害效应,各楼房倒塌解体充分,爆堆集中,周边各类保护对象均安然无恙。工程实践结果表明:工业电子雷管起爆网路可满足多单元、多层次的大规模起爆网路需求,为类似工程提供了重要借鉴。

关键词：爆破拆除框剪结构工业电子雷管爆破效果

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

丙烯酸基高吸水性树脂的研究进展

应用化工 2024年第1期53卷 150-155页

作者：王昆伦汤建伟刘咏刘鹏飞丁俊祥王保明郑州大学化工学院河南郑州450001 郑州大学生态与环境学院河南郑州450001 国家钙镁磷复合肥技术研究推广中心河南郑州450001 河南省减污降碳协同工程技术研究中心河南郑州450001

介绍了高吸水性树脂的制备方法以及各种方法的优缺点。概述了不同的改性材料对高吸水性树脂吸水保水性能的影响,并给出了增加比表面积、分子量、活性基团数量、适当的中和度和交联度等方法来提高吸水保水能力。总结了高吸水性树脂在环... 详细信息

介绍了高吸水性树脂的制备方法以及各种方法的优缺点。概述了不同的改性材料对高吸水性树脂吸水保水性能的影响,并给出了增加比表面积、分子量、活性基团数量、适当的中和度和交联度等方法来提高吸水保水能力。总结了高吸水性树脂在环境治理、建筑材料和农林业三个领域的应用。对高吸水性树脂性能的进一步改善进行了展望,开发低成本、可降解的高吸水性树脂仍是亟需解决的难题。

关键词：丙烯酸钠高吸水树脂保水剂聚合物材料

A practical technique of reverse orbicularis oculi muscle resection with preserved subcutaneous capillary network for double eyelid blepharoplasty

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Plastic and Reconstructive Surgery 2022年第3期4卷 115-118页

作者： Bin yang Jinhua Xu Enjing Wang Xinghai Gao lun liu Bin Xu Department of Plastic Surgery Yangzhong People’s HospitalYangzhou University School of MedicineYangzhong 212200ZhenjiangJiangsuChina

Background: Traditional full-incision double eyelid blepharoplasty has several significant disadvantages, including slow recovery and bilateral asymmetry, which results in high rates of patient dissatisfaction. These problems can be minimized using improved surgical techniques aimed at reducing tissue damage and bleeding, decreasing operation time, and especially at protecting the subcutaneous capillary network during the operation. We therefore aimed to guard the capillary network and reduce intraoperative bleeding using the practical technique of reverse orbicularis oculi muscle ***: Fifty cases of double eyelid blepharoplasty with traditional full-incision(group A) and 61 cases of reverse double eyelid blepharoplasty with a preserved capillary network(group B) were divided into two groups from October 1 to December 31, 2021 and from March 1 to May 31, 2022, respectively. The orbicularis oculi muscle was removed reversely from the front of the tarsal plate using double eyelid blepharoplasty, and the muscular membrane and subcutaneous capillary network were preserved. The operation time recorded in previous medical records was checked and compared with that of our novel technique. The recovery of double eyelid blepharoplasty was determined at 1, 4, and 12 weeks after the operation and patient satisfaction was also compared with that in previous medical records of patients in group ***: The reverse double eyelid blepharoplasty procedure was less complicated and easier to control than the traditional full-incision double eyelid blepharoplasty methodology. The average operation time of the double eyelid blepharoplasty cases with traditional full-incision was significantly greater than that of the cases of reverse double eyelid blepharoplasty with the capillary network preserved(45.68 ± 5.27 min and 31.11 ± 5.58 min,respectively;t=14.018 9, P=0.000 0). Patient satisfaction was 42% and 78.69%, respectively, at 1 week postoperation(χ~2=15.724 8, P=0.0

关键词： Double eyelid blepharoplasty Subcutaneous capillary network Orbicularis oculi muscle Postoperative satisfaction

在线全文

学校读者我要写书评

暂无评论

新疆油田打造年轻干部队伍的实践与思考

北京石油管理干部学院学报 2024年第2期31卷 33-38页

作者：谢玉银刘乃瑜何轮马良刘在功宫海岩杨彦东中国石油新疆油田公司党委组织部/人力资源部领导人员管理科中国石油新疆油田公司党委组织部/人力资源部培训科中国石油新疆油田公司新港公司人事(组织)科中国石油新疆油田公司党委

年轻干部是关乎企业未来发展的关键力量,中国石油新疆油田公司立足抓好后继有人根本大计,创新年轻干部培养方式方法,奋力打好责任协同落实、年轻干部储备、多维赋能锻造、选拔平台搭建“组合拳”,持续建强适应油田未来发展的战略接替力... 详细信息

年轻干部是关乎企业未来发展的关键力量,中国石油新疆油田公司立足抓好后继有人根本大计,创新年轻干部培养方式方法,奋力打好责任协同落实、年轻干部储备、多维赋能锻造、选拔平台搭建“组合拳”,持续建强适应油田未来发展的战略接替力量。在总结新疆油田以往经验的基础上,结合新时代面临的新形势新任务,深入剖析年轻干部队伍建设存在的问题,并围绕年轻干部“选育管用”全链条管理,提出对策建议。

关键词：年轻干部选育管用干部储备

Regulating the interfacial charge transfer and constructing symmetry-breaking sites for the enhanced N_(2) electroreduction activity

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2023年第2期5卷 193-200页

作者： Xiaoxue Zhang Yuehan Cao Zhen-Feng Huang Shishi Zhang Chengguang liu lun Pan Chengxiang Shi Xiangwen Zhang Ying Zhou Guidong yang Ji-Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjinChina Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) TianjinChina Zhejiang Institute of Tianjin University NingboZhejiangChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of New Energy and MaterialsInstitute of Carbon NeutralitySouthwest Petroleum UniversityChengduSichuanChina XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'anShaanxiChina

The Haber-Bosch process for industrial NH_(3) production is energy-intensive with heavy CO_(2) *** N_(2) reduction reaction(NRR)is an attractive carbon-neutral alternative for NH_(3) synthesis,while the challenge associated with N_(2) activation highlights the demand for efficient ***,we demonstrate that PdCu nanoparticles with different Pd/Cu ratios anchored on boron nanosheet(PdCu/B)behave as efficient NRR electrocatalysts toward NH_(3) *** and experimental results confirm that the highly efficient NH_(3) synthesis can be achieved by regulating the charge transfer between interfaces and forming a symmetry-breaking site,which not only alleviates the hydrogen evolution but also changes the adsorption configuration of N_(2) and thus optimizes the reaction pathway of NRR over the separated Pd *** with monometallic Pd/B and Cu/B,the PdCu/B with the optimized Pd/Cu ratio of 1 exhibits superior activity and selectivity for NH_(3) *** study provides new insight into developing efficient catalysts for small energy molecule catalytic conversion via regulating the charge transfer between interfaces and constructing symmetry-breaking sites.

关键词： catalyst design electrochemical N_(2)reduction interfacial charge transfer reaction mechanism symmetry-breaking sites