检索结果-南通市图书馆

Development of rocking constraint device with vertical damping capacity for three-dimensional base-isolated frame structures

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

Frontiers of Structural and Civil Engineering 2023年第3期17卷 350-367页

作者： Yundong SHI qi wang Wenqing dong Bo ZHAO Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation (Ministry of Emergency Management)Harbin 150080China School of Civil Engineering Tianjin UniversityTianjin 300072China

A new rocking constraint device(RCD)is developed for three-dimensional(3D)base-isolated frame structures by connecting a custom-designed cylinder pair to provide vertical damping with replaceable damping components installed outside the cylinders when the superstructure undergoes translational motion,and rocking constraint capacity when the superstructure is susceptible to *** formulas for calculating the damping and rocking constraint stiffness of the RCD are *** series of sinusoidal loading tests are conducted at different loading frequencies and amplitudes to verify the damping and rocking constraint performance of the *** test results show that the cylinder without orifices on its piston can provide the desired damping with a replaceable damping component,and that the RCD can effectively suppress *** the vertical stiffness of an individual cylinder is affected by the location of the replaceable damping component and loading frequency,the average vertical stiffness of the two cylinders,which determines the rocking constraint stiffness of the RCD,is independent of the two *** of the test and theoretical results indicate that the errors of the proposed formulas for calculating the damping and rocking constraint stiffness of the RCD do not exceed 12.9%and 11.0%,respectively.

关键词： three-dimensional isolation rocking behavior rocking constraint device replaceable damping component sinusoidal test

在线全文

学校读者我要写书评

暂无评论

网络工程专业教学体系的创新与实践

计算机教育 2009年第19期 111-114,126页

作者：陈鸣胡谷雨王元元周雷齐望东中国人民解放军理工大学江苏南京210007

解放军理工大学于1999年起启动了网络工程本科专业教学体系的建设工作。我校面向高素质人才培养目标,注重专业建设的顶层设计,取得了如下成果:凝炼网络技术内涵,创立网络技术人才培养的课程体系;填补国内教材空白,建设系统完整的教材体... 详细信息

解放军理工大学于1999年起启动了网络工程本科专业教学体系的建设工作。我校面向高素质人才培养目标,注重专业建设的顶层设计,取得了如下成果:凝炼网络技术内涵,创立网络技术人才培养的课程体系;填补国内教材空白,建设系统完整的教材体系;注重实践知行合一,构建先进配套的实验体系;实践创新教学相长,锻造一流的师资队伍。本文详细总结了我院网络工程专业教学体系创新实践的经验教训,论述了为取得以上成果而具体采取的措施。

关键词：网络工程教学体系课程教材实验

Effect of Heat Flux Distribution on Entropy Generation and Irreversibility of Lead-Bismuth Eutectic(LBE)Forced Convective Heat Transfer

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第1期32卷 223-236页

作者： ZHANG dong ZHANG Haochun wang qi SUN Wenbo School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Investigations on entropy generation and thermal irreversibility analysis are conducted for liquid lead-bismuth eutectic(LBE)in an annular *** find better performance in convective heat transfer,the computational fluid dynamics(CFD)code based on the finite volume method(FVM)is adopted to solve this *** elevated temperature LBE flows in the annular pipe,and four types of heat flux,including constant,linear increase and decrease,and parabolic distributions are imposed at the inside wall of the annular *** investigations are conducted for the specific average heat input of 200 kW/m^(2),and the different Peclet number Pe is set from 1200 to *** SST k-ωturbulent model and Cheng-Tak Prt model are *** mesh independence validation and models verification are also conducted and the maximum Nu error is 5.43%compared with previous experimental *** results from the local and system scales,respectively,including volumetric dimensionless entropy generation,Ns,Be,and Ep,are *** results indicate that the viscous friction and heat transfer caused by entropy generation can be found in the viscous sub-layer and buffer layer *** transfer is the primary factor that leads to irreversible ***,the results show that the best thermodynamic performance occurs under parabolic distributed heat flux in the research scope.

关键词： liquid lead-bismuth eutectic entropy generation analysis annular pipe CFD

黄芩苷与苦参碱分子间相互作用的量子化学计算与验证

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第4期42卷 8-14页

作者：董志舒启江田爽王皎侯安国王文苹云南中医药大学中药学院云南省南药可持续利用重点实验室昆明650500

为探究苦参碱能极大增强黄芩苷在水中的溶解度的原因,采用量子计算对二者反应过程及共存状态进行分析,并使用单晶衍射和红外图谱验证计算结果.本研究表明,黄芩苷和苦参碱并非简单的以非共价作用相结合,二者存在质子转移现象,反应生成黄... 详细信息

为探究苦参碱能极大增强黄芩苷在水中的溶解度的原因,采用量子计算对二者反应过程及共存状态进行分析,并使用单晶衍射和红外图谱验证计算结果.本研究表明,黄芩苷和苦参碱并非简单的以非共价作用相结合,二者存在质子转移现象,反应生成黄芩苷阴离子和苦参碱阳离子,以静电作用为主导形成共无定型物,导致水溶性极大增加.

关键词：苦参碱黄芩苷质子转移离子共无定型物

Assessing the dynamics of O_(2) desorption from cobalt phthalocyanine by in situ electrochemical scanning tunneling microscopy

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第11期98卷 144-148页

作者： Yu-qi wang Yue Feng Xiang wang dong wang CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Science(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

We report here the in situ electrochemical scanning tunneling microscopy(ECSTM) study of cobalt phthalocyanine(CoPc)-catalyzed O_(2) evolution reaction(OER) and the dynamics of CoPc-O_(2) *** self-assembled CoPc monolayer is fabricated on Au(111) substrate and resolved by ECSTM in 0.1 M KOH *** OH^(-)adsorption on CoPc prior to OER is observed in ECSTM *** OER,the generated O_(2) adsorbed on Co Pc is observed in the CoPc *** step experiment is employed to monitor the desorption of OER-generated O_(2) from CoPc,which results in the decreasing surface coverage of CoPc-O_(2) with *** rate constant of O_(2) desorption is evaluated through data *** insights into the dynamics of Co-O_(2) dissociation at the molecular level via in situ imaging help understand the role of Co-O_(2) in oxygen reduction reaction(ORR) and OER.

关键词： Electrochemical scanning tunneling microscopy Oxygen evolution reaction Cobalt phthalocyanine

Passive control of Permanent Magnet Synchronous Motor chaotic system based on state observer

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第12期7卷 1979-1983页

作者： qi dong-lian wang qiao School of Electrical Engineering Zhejiang University Hangzhou 3 I0027. China

Passive system theory was applied to propose a new passive control method with nonlinear observer of the Permanent Magnet Synchronous Motor chaotic system. Through constructing a Lyapunov function, the subsystem of the Permanent Magnet Synchronous Motor chaotic system could be proved to be globally stable at the equilibrium point. Then a controller with smooth state feedback is designed so that the Permanent Magnet Synchronous Motor chaotic system can be equivalent to a passive system. To get the state variables of the controller, the nonlinear observer is also studied. It is found that the outputs of the nonlinear observer can approximate the state variables of the Permanent Magnet Synchronous Motor chaotic system if the system’s nonlinear function is a globally Lipschitz function. Simulation results showed that the equivalent passive system of Permanent Magnet Synchronous Motor chaotic system could be globally asymptotically stabilized by smooth state feedback in the observed parameter convergence condition area.

关键词： Permanent Magnet Synchronous Motor Passive system State observer

Surveying the electrocatalytic CO_(2)-to-CO activity of heterogenized metallomacrocycles via accurate clipping at the molecular level

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第12期15卷 10070-10077页

作者： Meng-Ke Hu Ning wang dong-dong Ma qi-Long Zhu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences(CAS)Fuzhou350002China College of Chemistry Fuzhou UniversityFuzhou350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou350108China

Heterogenized phthalocyanine-based molecular catalysts are the ideal electrocatalytic platforms for CO_(2)reduction reaction(CO_(2)RR)because of their well-defined structures and potential *** addition to the pursuit of catalytic performances at industrial potentials,it is equally important to explore experimental rules and design considerations behind activity and ***,we successfully developed a series of nickel phthalocyanines(NiPcs)with different alkyl chains immobilized on multi-walled carbon nanotubes(CNT)to unveil the structure-performance relationship for electrocatalytic CO_(2)RR in neutral ***,a volcano-type trend was found between the activity for CO_(2)-to-CO conversion and alkyl chain lengths of NiPcs on *** results further indicate that their electrocatalytic CO_(2)RR activities are highly related to the molecular dispersion and the heterointerfacial charge transfer capability adjusted by the alkyl ***,the optimized electrocatalyst via accurate clipping at the molecular level exhibits an ultrahigh activity with Faradaic efficiency of CO up to 99.52%.

关键词： nickel phthalocyanines carbon nanotubes CO_(2)reduction reaction alkyl chains structure-performance relationship

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

髌股关节CT测量参数的比较

实用放射学杂志 2005年第5期21卷 504-507页

作者：宦坚龚建平董启榕汪益钱铭辉苏州大学附属第二医院影像科苏州大学附属第二医院骨外科苏州大学附属第二医院影像科江苏苏州215004

目的探讨7个反映髌股关节排列关系参数的叠加法测量和单层法测量可信度。方法15名前膝疼痛患者的30个膝关节,在屈膝0°和30°股肌松弛状态下,分别用CT图像叠加法和单层法测量髌股关节紊乱的7个参数,测量采用盲法重复,并应用组内相关系数... 详细信息

目的探讨7个反映髌股关节排列关系参数的叠加法测量和单层法测量可信度。方法15名前膝疼痛患者的30个膝关节,在屈膝0°和30°股肌松弛状态下,分别用CT图像叠加法和单层法测量髌股关节紊乱的7个参数,测量采用盲法重复,并应用组内相关系数(ICC)评价测量可重复性。结果在屈膝0°和30°叠加测量法和单层测量法的外侧髌骨角(LPA)、髌骨倾斜角(PTA),以及叠加法的适合角(CA)、股骨滑车角(FTA)具有高可信度(ICC>0.9),单层法的CA在屈膝30°下可信度高(ICC>0.9)。结论CT图像叠加法测量LPA、PTA、CA、FTA有好的可重复性。

关键词：骨髌股关节体层摄影术,X线计算机

Mathematical Modelling and Numerical Simulation of the Non-isothermal In-mold Vulcanization of Natural Rubber

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2015年第3期33卷 395-403页

作者： Dan-hui wang qi dong 贾玉玺 Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education) Shandong University

According to the vulcanization kinetic equation of natural rubber （NR） established in the isothermal situation, the numerical computation expression of the degree of cure under non-isothermal condition is constructed by means of incremental method. The description of non-isothermal in-mold vulcanization process is carried out by the finite element method. The mold-opening time, the rubber and mold temperatures, the degree of rubber cure and its distribution characteristics are numerically analyzed, by changing the key formulas and parameters in the process including the temperature of curing medium, the concentration of 2-mercaptobenzothiazole, the heat transfer manner of mold side, and the convective heat transfer coefficient of heating boundary. The quantitative results will help engineers to design proper formulas and optimize processing conditions.

关键词： Natural rubber Non-isothermal vulcanization Degree of cure Processing conditions Finite element simulation.