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绿色单体二氧化碳参与的新型聚合反应

化学学报 2020年第1期78卷 9-22页

作者：宋波秦安军唐本忠华南理工大学发光材料与器件国家重点实验室广东省分子聚集发光重点实验室聚集诱导发光研究中心香港科技大学化学系国家人体组织功能重建工程技术研究中心香港分中心

二氧化碳（CO;）是一种丰富、廉价、无毒以及可再生的一碳资源,也是一种可用于聚合的绿色单体.基于CO;的聚合是近年来的研究热点之一.目前广泛报道的是CO;和环氧单体的聚合反应,经过几十年的发展已经成功实现工业化生产.最近几年,一些CO... 详细信息

二氧化碳（CO;）是一种丰富、廉价、无毒以及可再生的一碳资源,也是一种可用于聚合的绿色单体.基于CO;的聚合是近年来的研究热点之一.目前广泛报道的是CO;和环氧单体的聚合反应,经过几十年的发展已经成功实现工业化生产.最近几年,一些CO;参与的新型聚合反应被陆续报道,这些工作大都通过两种途径实现从CO;到高分子材料的转变.第一个途径是先将CO;转化为可以聚合的单体,例如:内酯、环状碳酸酯和2,5-二呋喃甲酸等,再利用开环或者逐步聚合将单体转化为聚合物;另一个途径是直接以CO;为单体和其他类型单体共聚得到聚合物.这两种途径对于发展CO;参与的新型聚合反应,拓展CO;基聚合物种类都具有重要意义.本综述按照CO;直接还是间接参与聚合反应分类总结了近年来在CO;制备高分子材料方面的进展,并对未来发展方向进行了简单阐述.

关键词：二氧化碳(CO ) 炔类单体环状碳酸酯内酯 2,5-二呋喃甲酸

Effect of inlet volute wrap angle on the flow field and performance of double inlet gas cyclones

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Particuology 2023年第6期77卷 29-36页

作者： Zetao Wang Guogang Sun Zhengyuan song Shiwei Yuan Zhen Qian College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China

In response to the divergent understanding of double inlet cyclone performance in the literature,the effect of inlet volute wrap angle on the performance and flow field of double inlet cyclone separator was studied by Computational Fluid Dynamic(CFD)*** results showed that the inlet volute wrap angle can affect the comparison results of the single and double inlet gas cyclones with the same total inlet cross-sectional area and velocity.0°and 90°volute double inlet improved the efficiency mainly by separating particles below 10μm,while 180°volute double inlet had no separation advantage for any particles,so the symmetrical double inlet does not always improve the efficiency,and the appropriate inlet volute wrap angle should be selected according to the actual situation,otherwise,the expected performance requirements of the symmetrical double inlet cyclone cannot be *** with the flow field,it is found that the inlet volute wrap angle changed the tangential velocity of the sym-metrical double inlet cyclone separator,thus changing the performance.

关键词： Cyclone separator Inlet volutewrapangle Efficiency Pressure drop Double inlet

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钻孔导致孔边木材残余变形和弹塑性损伤研究

建筑结构学报 2023年第10期44卷 114-122页

作者：唐践扬宋晓滨郭宇宋胤恺同济大学建筑工程系上海200092 同济大学工程结构性能演化与控制教育部重点实验室上海200092 上海市建筑科学研究院有限公司上海市工程结构安全重点实验室上海200032

为研究胶合木钻孔加工产生的孔周塑性变形导致木材力学性能下降的问题,开展了木材钻孔损伤测试,通过数字图像相关法(digital image correlation,DIC)测量了木材钻孔导致的孔周残余应变,并基于木材弹塑性损伤本构模型得到了钻孔损伤因子... 详细信息

为研究胶合木钻孔加工产生的孔周塑性变形导致木材力学性能下降的问题,开展了木材钻孔损伤测试,通过数字图像相关法(digital image correlation,DIC)测量了木材钻孔导致的孔周残余应变,并基于木材弹塑性损伤本构模型得到了钻孔损伤因子,分析了转速、孔径和木材种类等参数对孔周木材损伤的分布宽度和角度的影响。结果表明:木材孔周残余应变分布区域、残余压应变最大值和损伤相对分布宽度、分布角度等均受转速的影响较大,而受孔径大小及木材种类的影响较小;低转速时,顺纹残余应变主要分布在1#和3#象限内,横纹残余应变主要分布在2#和4#象限内,剪切应变均匀分布在孔周,而高转速时残余应变在木材孔周分布较均匀;孔周最大残余压应变随转速增加而增加,最大增加282%;所测试的三种树种中,云杉的最大损伤相对分布宽度最大,花旗松的最大损伤相对分布宽度最小,且云杉-松-铁杉和花旗松的最大损伤相对宽度随孔径增加而减小最多达75%。

关键词：木材钻孔损伤数字图像相关法残余应变损伤因子

Local linear estimator for stochastic diferential equations driven by α-stable Lvy motions

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Science China Mathematics 2014年第3期57卷 609-626页

作者： LIN ZhengYan song YuPing YI JiangSheng Department of Mathematics Zhejiang University

We study tile local linear estimator for tile drift coefficient of stochastic differential equations driven by α-stable Levy motions observed at discrete instants. Under regular conditions, we derive the weak consis- tency and central limit theorem of the estimator. Compared with Nadaraya-Watson estimator, the local linear estimator has a bias reduction whether the kernel function is symmetric or not under different schemes. A silnu- lation study demonstrates that the local linear estimator performs better than Nadaraya-Watson estimator, especially on the boundary.

关键词： local linear estimator stable Levy motion drift coefficient bias reduction consistency centrallimit theorem

Resonance Active Damping and PCC Voltage Quality Improvement of DFIG System Connected to Parallel Compensated Grid

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Chinese Journal of Electrical Engineering 2018年第4期4卷 33-40页

作者： Yipeng song Nian Heng Frede Blaabjerg Department of Energy Technology Aalborg UniversityAalborg East 9220Denmark College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

Under the connection to a weak grid,the Doubly Fed Induction Generator(DFIG)based wind power system has potential risk from two operational *** first issue is the High Frequency Resonance(HFR)mode due to the impedance interaction between the DFIG system and the weak *** order to ensure safe and reliable operation of the DFIG system,it is necessary to implement effective active damping strategies to mitigate the *** second issue is low order voltage harmonic distortion at the Point of Common Coupling(PCC),where consequently the performance of other grid-connected devices may *** could be advantageous that the DFIG system is able to improve the voltage quality at PCC by eliminating the low order harmonic *** this paper,both of the above mentioned DFIG operational characters,i.e.,active damping of HFR and the improvement of voltage quality at PCC,will be achieved by implementing advanced control strategies in the Rotor Side Converter(RSC)and the Grid Side Converter(GSC)*** are provided to verify the proposed control strategies for DFIG system connected to a weak grid.

关键词： DFIG system weak grid High Frequency Resonance(HFR) harmonic distortion active damping

Gravity-capillary waves modulated by linear shear flow in arbitrary water depth

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Chinese Physics B 2020年第12期29卷 346-355页

作者： Shaofeng Li Jinbao song Anzhou Cao Ocean College Zhejiang UniversityZhoushan 316000China

Considering that the fluid is inviscid and incompressible and the flow is irrotational in a fixed frame of reference and using the multiple scale analysis method, we derive a nonlinear Schrodinger equation(NLSE) describing the evolution dynamics of gravity-capillary wavetrains in arbitrary constant depth. The gravity-capillary waves(GCWs) are influenced by a linear shear flow(LSF) which consists of a uniform flow and a shear flow with constant vorticity. The modulational instability(MI) of GCWs with the LSF is analyzed using the NLSE. The MI is effectively modified by the LSF. In infinite depth, there are four asymptotes which are the boundaries between MI and modulational stability(MS) in the instability diagram. In addition, the dimensionless free surface elevation as a function of time for different dimensionless water depth,surface tension, uniform flow and vorticity is exhibited. It is found that the decay of free surface elevation and the steepness of free surface amplitude change over time, which are greatly affected by the water depth, surface tension, uniform flow and vorticity.

关键词： gravity-capillary waves nonlinear Schrodinger equation linear shear flow modulational instability

Systems pharmacology-based investigation of Sanwei Ganjiang Prescription:related mechanisms in liver injury

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Chinese Journal of Natural Medicines 2018年第10期16卷 756-765页

作者： LUO Yun-Xia WANG Xin-Yue HUANG Yu-Jie FANG Shu-Huan WU Jun ZHANG yong-Bin XIONG Tian-Qin YANG Cong SHEN Jian-Gang SANG Chuan-Lan WANG Qi FANG Jian-song Institute of Clinical Pharmacology Guangzhou University of Chinese Medicine Cancer Center Sun Yat-sen University School of Chinese Medicine Li Ka Shing Faculty of MedicineThe University of Hong Kong

Liver injury remains a significant global health problem and has a variety of causes,including oxidative stress(OS),inflammation,and apoptosis of liver *** is currently no curative therapy for this *** Ganjiang Prescription(SWGJP),derived from traditional Chinese medicine(TCM),has shown its effectiveness in long-term liver damage therapy,although the underlying molecular mechanisms are still not fully *** explore the underlining mechanisms of action for SWGJP in liver injury from a holistic view,in the present study,a systems pharmacology approach was developed,which involved drug target identification and multilevel data integration *** a comprehensive systems approach,we identified 43 candidate compounds in SWGJP and 408 corresponding potential *** further deciphered the mechanisms of SWGJP in treating liver injury,including compound-target network analysis,target-function network analysis,and integrated pathways *** deduced that SWGJP may protect hepatocytes through several functional modules involved in liver injury integrated-pathway,such as Nrf2-dependent anti-oxidative stress ***,systems pharmacology provides an alternative way to investigate the complex action mode of TCM.

关键词： Systems pharmacology Traditional Chinese Medicine Sanwei Ganjiang Prescription Liver injury Oxidative stress

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企业集成模式组合建模方法

计算机集成制造系统 2011年第5期17卷 1096-1103页

作者：陈皓梁英唐皓虎嵩林中国科学院计算技术研究所北京100190 中国科学院研究生院北京100049

针对先进制造领域中业务系统集成和服务快速封装问题,提出了一种企业集成模式的组合建模方法。定义企业集成模式单元以描述企业集成模式,支持业务系统功能的调用和模式化的消息处理;采用企业集成模式组合方法实现业务系统间的消息路由功... 详细信息

针对先进制造领域中业务系统集成和服务快速封装问题,提出了一种企业集成模式的组合建模方法。定义企业集成模式单元以描述企业集成模式,支持业务系统功能的调用和模式化的消息处理;采用企业集成模式组合方法实现业务系统间的消息路由功能;使用Petri网描述模式组合,并给出组合的正确性验证算法;实现了企业集成模式建模工具MixEIP,支持以配置的方式构建企业集成模式组合。实验结果表明,该方法不仅提高了集成系统的建模效率,还具有较快的消息处理速度。

关键词：企业集成模式消息处理组合建模方法企业服务总线建模

Asymmetrical response of summer rainfall in East Asia to CO_(2)forcing

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Science Bulletin 2022年第2期67卷 213-222,M0004页

作者： Se-yong song Sang-Wook Yeh Soon-Il An Jong-Seong Kug Seung-Ki Min Seok-Woo Son Jongsoo Shin Department of Marine Sciences and Convergence Technology Hanyang UniversityAnsan 15588South Korea Department of Atmospheric Sciences/Irreversible Climate Change Research Center Yonsei UniversitySeoul 03722South Korea Division of Environmental Science and Engineering Pohang University of Science and TechnologyPohang 37673South Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversityIncheon 21983South Korea School of Earth and Environmental Science Seoul National UniversitySeoul 08826South Korea

Understanding the regional hydrological response to varying CO_(2)concentration is critical for cost-benefit analysis of mitigation and adaptation polices in the near future. To characterize summer monsoon rainfall change in East Asia in a changing CO_(2)pathway, we used the Community Earth System Model(CESM) with28 ensemble members in which the CO_(2)concentration increases at a rate of 1% per year until its quadrupling peak, i.e., 1468 ppm(ramp-up period), followed by a decrease of 1% per year until the present-day climate conditions, i.e., 367 ppm(ramp-down period). Although the CO_(2)concentration change is symmetric in time, the amount of summer rainfall anomaly in East Asia is increased 42% during a rampdown period than that during a ramp-up period when the two periods of the same CO_(2)concentration are compared. This asymmetrical rainfall response is mainly due to an enhanced El Ni?o-like warming pattern as well as its associated increase in the sea surface temperature in the western North Pacific during a ramp-down period. These sea surface temperature patterns enhance the atmospheric teleconnections and the local meridional circulations around East Asia, resulting in more rainfall over East Asia during a ramp-down period. This result implies that the removal of CO_(2)does not guarantee the return of regional rainfall to the previous climate state with the same CO_(2)concentration.

关键词： CO_(2)concentration East Asian summer monsoon Asymmetric rainfall El Ni?o-like warming