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茂金属催化剂催化烯烃聚合反应的研究 ——聚合物的聚集行为和热性能 Letter
吴长江, Minqiao Ren, Liping Hou, Shuzhang Qu, Xinwei Li, Cui Zheng, Jian Chen, 王伟
《工程(英文)》 2023年 第30卷 第11期 页码 93-99 doi: 10.1016/j.eng.2023.07.001
Olefin solution polymerization can be used to obtain high-performance polyolefin materials that cannot be obtained via other polymerization processes. Polyolefin elastomers (POE) are a typical example. Due to cost, only a few linear α-olefins (e.g., 1-butene, 1-hexene, and 1-octene) are used as comonomers in solution polymerization in industry. However, α-olefin comonomers with other structures may have different effects on polymerization in comparison with common linear ones. Moreover, the properties of the corresponding materials may differ significantly. In this work, copolymers of ethylene with linear and end-cyclized α-olefins are synthesized using a metallocene catalyst. The copolymerization of ethylene with linear α-olefins results in a higher turn-over frequency (TOF) and lower incorporation than copolymerization with end-cyclized α-olefins, which may indicate that end-cyclized α-olefins have a higher coordination probability and lower insertion rate. In this reaction, the comonomer is distributed randomly in the polymer chain and efficiently destroys crystallization. End-cyclized α-olefins exhibit a much stronger crystallization destructive capacity (CDC) in the copolymer than linear α-olefins, possibly because linear α-olefins act mainly in the radial direction of the main chain of the polymer, while end-cyclized α-olefins act mainly in the axial direction of the main chain.
关键词: Metallocene catalyst Ethylene copolymerization Comonomer distribution Crystallization destructive capacity
Tianxiang XIA, Xuehua LIU
《环境科学与工程前沿(英文)》 2011年 第5卷 第2期 页码 236-242 doi: 10.1007/s11783-010-0218-8
Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.
《化学科学与工程前沿(英文)》 2022年 第16卷 第6期 页码 985-995 doi: 10.1007/s11705-021-2126-y
关键词: microalgae hydrothermal liquefaction biocrude nitrogen distribution
Xiyan GUO, Yongping YANG
《能源前沿(英文)》 2011年 第5卷 第1期 页码 69-74 doi: 10.1007/s11708-010-0117-7
关键词: thermodynamic model energy distribution boiler unsteady conditions
Xuewei QI,Ke LI,Walter D. POTTER
《环境科学与工程前沿(英文)》 2016年 第10卷 第2期 页码 341-351 doi: 10.1007/s11783-015-0776-z
关键词: particle swarm optimization (PSO) diversity control estimation of distribution algorithm (EDA) water distribution network (WDN) premature convergence hybrid strategy
Hazard and vulnerability evaluation of water distribution system in cases of contamination intrusion
Kunlun XIN, Tao TAO, Yong WANG, Suiqing LIU
《环境科学与工程前沿(英文)》 2012年 第6卷 第6期 页码 839-848 doi: 10.1007/s11783-012-0409-8
关键词: water distribution network hazard vulnerability contaminant accident
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 241-248 doi: 10.1007/s11465-011-0219-x
This paper presents a new calculation method that can calculate the load distribution on pipe threaded connections under tension load. On the basis of elastic mechanics, the new method was developed by analyzing each thread tooth, and a new deformation and covariant equation by making a mechanics analysis on each thread tooth was obtained. Compared with the traditional method proposed by the previous references, the new deformation and covariant equation could be used to describe the relation between the previous and the next thread tooth. By applying the new method on the sample of P-110S pipe threaded connection, the obtained results show that the load on thread tooth mainly concentrates on the four or five threads engaged and the middle teeth were not utilized well to bear the loads. The model offers a new way to calculate the loads carried on the thread teeth under tension load.
关键词: load distribution calculation method pipe threaded connections tension load
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
《能源前沿(英文)》 2011年 第5卷 第1期 页码 98-103 doi: 10.1007/s11708-010-0019-8
关键词: solar cavity receiver Monte Carlo method heat flux distribution
《环境科学与工程前沿(英文)》 2021年 第15卷 第3期 doi: 10.1007/s11783-020-1356-4
•Bacterial concentrations from eight stages were 104–105copies/m3.
关键词: Size distribution Airborne bacteria Biological diversity Human pathogenic bacteria Composting plants
Reactive power deployment and cost benefit analysis in DNO operated distribution electricity markets
Atma Ram GUPTA,Ashwani KUMAR
《能源前沿(英文)》 2019年 第13卷 第1期 页码 86-98 doi: 10.1007/s11708-017-0456-8
关键词: unbalanced distribution system D-STATCOM voltage sensitivity index load models load growth distribution network operator (DNO)
《能源前沿(英文)》 2023年 第17卷 第3期 页码 446-446 doi: 10.1007/s11708-022-0851-7
关键词: distributed optimization energy management networked microgrids three-phase distribution network distributed energy resources
K Sathish KUMAR,S NAVEEN
《能源前沿(英文)》 2014年 第8卷 第4期 页码 434-442 doi: 10.1007/s11708-014-0313-y
关键词: distribution system reconfiguration (DFR) power loss reduction catfish particle swarm optimization (catfish PSO) radial structure
Chung Nguyen VAN; Hai TRAN THANH; Thuc Nhu NGUYEN; Jianchun LI
《结构与土木工程前沿(英文)》 2022年 第16卷 第11期 页码 1424-1435 doi: 10.1007/s11709-022-0870-9
关键词: ECC fiber orientation distribution casting direction casting position
Soot size distribution in lightly sooting premixed flames of benzene and toluene
Wang LIU, Jiaqi ZHAI, Baiyang LIN, He LIN, Dong HAN
《能源前沿(英文)》 2020年 第14卷 第1期 页码 18-26 doi: 10.1007/s11708-020-0663-6
关键词: premixed flame soot particle size distribution function benzene toluene
标题 作者 时间 类型 操作
茂金属催化剂催化烯烃聚合反应的研究 ——聚合物的聚集行为和热性能
吴长江, Minqiao Ren, Liping Hou, Shuzhang Qu, Xinwei Li, Cui Zheng, Jian Chen, 王伟
期刊论文
Copper and zinc interaction on water clearance and tissue metal distribution in the freshwater mussel
Tianxiang XIA, Xuehua LIU
期刊论文
Thermodynamic models and energy distribution of single-phase heated surface in a boiler under unsteady
Xiyan GUO, Yongping YANG
期刊论文
Estimation of distribution algorithm enhanced particle swarm optimization for water distribution network
Xuewei QI,Ke LI,Walter D. POTTER
期刊论文
Hazard and vulnerability evaluation of water distribution system in cases of contamination intrusion
Kunlun XIN, Tao TAO, Yong WANG, Suiqing LIU
期刊论文
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
期刊论文
Nikos Hatziargyrio:The Role of Data in Intelligent Distribution Grids(2022年6月6日)
2022年07月07日
会议视频
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
期刊论文
The size distribution of airborne bacteria and human pathogenic bacteria in a commercial composting plant
期刊论文
Reactive power deployment and cost benefit analysis in DNO operated distribution electricity markets
Atma Ram GUPTA,Ashwani KUMAR
期刊论文
Distributed energy management for networked microgrids in a three-phase unbalanced distribution network
期刊论文
Power system reconfiguration and loss minimization for a distribution systems using “Catfish PSO” algorithm
K Sathish KUMAR,S NAVEEN
期刊论文
Numerical investigation of the influence of casting techniques on fiber orientation distribution in ECC
Chung Nguyen VAN; Hai TRAN THANH; Thuc Nhu NGUYEN; Jianchun LI
期刊论文