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Controlled cationic ring-opening polymerization of L-lactide by organic ion pair: novel approach to isotactic-rich and crystalline polylactide

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Science China Chemistry 2025年第1期68卷 394-402页

作者： Zhiqiang ding Mingqian Wang Zijing Zhou bin Wang Yuesheng Li Tianjin Key Laboratory of Composite & Functional Materials School of Materials Science and Engineering Tianjin University

Living/controlled cationic ring-opening polymerization （ROP） of L-lactide is a promising approach to isotactic-rich and crystalline poly（L-lactide）.In contrast with the unsubstituted lactones,L-LA can not be polymerized by organic Lewis acids or carbenium ions,and the state of the art in this field is the cationic ROP of L-LA catalyzed by Br?nsted acid/alcohol system via activated monomer ***,we reported the first example of controlled cationic ROP of L-LA by using Meerweintype ion pair[Me3O]+[B（C6F5）4]-as the catalyst.[Me3O]+[B（C6F5）4]-promoted rapid L-LA cationic polymerization in the absence of alcohol,producing isotactic-rich and crystalline PLLA without transesterification and epimerization side *** activated chain end mechanism,involving twice SN2 substitution and configuration-inversion （S→R→S） with the assistance of released Me2O,was proposed and further verified by density functional theory and control *** work expands the catalytic toolbox of isotactic-rich and crystalline polylactide *** represents a unique example of cationic-controlled polymerization of L-LA catalyzed by an organic ion pair.

关键词： organic ion pair controlled cationic ring-opening polymerization activated chain end mechanism isotactic-rich polylactide

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完善渔船登记办法保障申请人合法权利

中国渔业经济 2011年第4期29卷 12-17页

作者：丁国斌江苏渔港监督局浏河分局

论文以案例为出发点,分析了申请人寻求法律救济的可能渠道以及行不通的原因。权益得不到维护的原因在于法律规定的不明确。在分析了《中华人民共和国渔业船舶登记办法》诸多不足之后,论文认为只有完善了该办法,才能保障申请人的合法权益... 详细信息

论文以案例为出发点,分析了申请人寻求法律救济的可能渠道以及行不通的原因。权益得不到维护的原因在于法律规定的不明确。在分析了《中华人民共和国渔业船舶登记办法》诸多不足之后,论文认为只有完善了该办法,才能保障申请人的合法权益,并对该办法中需要修改和完善的方面进行了论述。

关键词：登记办法复议决定权利

关于船舶所有权登记与国籍登记的探讨——兼谈船舶国籍登记持证人的确定

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中国渔业经济 2010年第4期28卷 98-105页

作者：丁国斌江苏渔港监督局浏河分局

《船舶登记条例》和《渔业船舶登记办法》把船舶所有权登记作为船舶国籍登记的前提,船舶所有权登记也就成为了强制登记。作者从船舶物权是动产物权,其转移所有权的公示方式是交付,船舶物权登记不是强制登记,在法律上产生的是对抗善意第... 详细信息

《船舶登记条例》和《渔业船舶登记办法》把船舶所有权登记作为船舶国籍登记的前提,船舶所有权登记也就成为了强制登记。作者从船舶物权是动产物权,其转移所有权的公示方式是交付,船舶物权登记不是强制登记,在法律上产生的是对抗善意第三人的效力人手,论述了所有权登记应实行国家引导船东自主决定的原则;从行政许可角度,本文论述了国籍登记(初始)是行政许可,确认的权利主体即持证人应当是船长,国家基于行政管理的需要对国籍登记应实行强制登记;作者从理论上和实务上对船舶所有权与国籍分别登记进行了阐述。

关键词：国籍登记所有权登记分别登记确定持证人

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关于加强渔船登记工作的探讨

中国渔业经济 2010年第1期28卷 40-46页

作者：丁国斌江苏渔港监督局浏河分局

当渔船发生所有权转让时,原所有权人要办理注销登记,新所有权人要申请新登记。实务中,渔船登记机关因没有仔细区分渔船国籍注销登记和所有权注销登记的性质,《登记办法》对渔船注销登记规定不明确,不时发生登记渔船权属争议,导致登记机... 详细信息

当渔船发生所有权转让时,原所有权人要办理注销登记,新所有权人要申请新登记。实务中,渔船登记机关因没有仔细区分渔船国籍注销登记和所有权注销登记的性质,《登记办法》对渔船注销登记规定不明确,不时发生登记渔船权属争议,导致登记机关工作处于被动状态。本文作者通过陈述渔船不按规定办理注销登记的情形,分析了渔船不按规定办理注销登记的主、客观原因,论述了渔船不办理注销登记的法律后果,并就如何加强渔船注销登记工作,实现对渔船登记的全程监管,提出了具体的设想。

关键词：渔船登记监管探讨

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《环境污染损害责任保险法》之法律构架

中国渔业经济 2009年第4期27卷 28-36页

作者：丁国斌江苏渔港监督局浏河分局江苏太仓浏河渔港浏河分局

生产经营者在生产经营过程中因意外事故、安全生产事故、过量地向外界排放"三废"而发生环境污染事故,导致人身伤害和环境破坏,在清理污染过程中又会产生清污费用和污染扩大等后果,为此生产经营者要承担赔偿责任。本文探讨了我国应当实... 详细信息

生产经营者在生产经营过程中因意外事故、安全生产事故、过量地向外界排放"三废"而发生环境污染事故,导致人身伤害和环境破坏,在清理污染过程中又会产生清污费用和污染扩大等后果,为此生产经营者要承担赔偿责任。本文探讨了我国应当实行强制污染损害责任保险制度和强制征收污染损害赔偿基金制度,建立污染损害赔偿体系的问题;阐述了立法目的、研究对象、保险范围、法律的基本原则、当事人权利义务、保险形式、损失范围的审定、赔偿范围、归责原则和政府的责任。

关键词：环境污染损害责任保险法律构架

对船舶物权强制登记的探讨——兼谈船舶登记与保险承保的关系

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中国渔业经济 2011年第6期29卷 66-71页

作者：丁国斌江苏渔港监督局浏河分局

船舶物权到底是动产物权还是不动产物权,它的设立、变更、转让、消灭(以下称船舶物权转移)是否需要强制登记,理论界、实务界认识不一,笔者从理论和法律的角度对船舶物权是动产物权进行了详尽的论述,揭示了船舶物权转移的公示形式是"交... 详细信息

船舶物权到底是动产物权还是不动产物权,它的设立、变更、转让、消灭(以下称船舶物权转移)是否需要强制登记,理论界、实务界认识不一,笔者从理论和法律的角度对船舶物权是动产物权进行了详尽的论述,揭示了船舶物权转移的公示形式是"交付",它的登记不是强制的;中国渔业互助保险的"渔船保险条款"规定了渔船登记是保险人承保船舶险的要件,笔者通过对船舶登记性质的证成,阐述了船舶适航才是船舶保险的必要条件,无论是作为国家行政管理手段的国籍登记,还是对船舶物权确认的所有权登记,均不是保险承保的要件。

关键词：船舶物权转移登记保险

Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi ding Zhe Sui Hong Su Xu guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

Satellite-assisted 6G wide-area edge intelligence:dynamics-aware task offloading and resource allocation for remote IoT services

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Science China(Information Sciences) 2025年

作者： Di ZHAO Rui ding bin SONG State Key Laboratory of Integrated Services Networks Xidian University Hangzhou Institute of Technology Xidian University China Satellite Network Group Co. Ltd.

Future 6G networks will integrate non-terrestrial communication with mobile edge computing to enable wide-area edge intelligence, providing ubiquitous communication and computation services for everyone and everything. In this paper, we introduce the intelligent cloud-edge-device architecture into low Earth orbit (LEO) satellite-supported remote Internet of Things(IoT) networks to facilitate latency-sensitive and compute-intensive IoT applications. However, the dynamic spatio-temporal characteristics inherent in LEO satellite networks, such as the high volatility of task traffic and the high mobility of space nodes, pose severe challenges. For efficient task execution, we investigate the joint optimization of cross-region task offloading and cross-domain resource allocation, and innovatively propose a spatio-temporal attention-based proximal policy optimization(STA-PPO) algorithm. Specifically, the temporal attention-based actor network analyzes the timing dependencies of task arrival and makes time-variant decisions. Simultaneously, the spatial attention-based critic network captures the spatial variations of satellite motion and evaluates the topology-related value. We verify the effectiveness of the cloud-edge-device collaboration through extensive simulations. Numerical results demonstrate that the STA-PPO algorithm outperforms benchmarks, showing the lowest system delay and the highest link throughput.

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Experimental Study on Energy Storage Characteristics of Sintered Ore Particle Packed Beds

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Journal of Thermal Science 2025年第1期34卷 242-253页

作者： LAI Zhenya ding Liwei LYU Hongkun HOU Chenglong CHEN Jiaying guo Xutao HAN Gaoyan ZHANG Kang State Grid Zhejiang Electric Power Research Institute State Key Laboratory of Clean Energy Utilization Zhejiang University

The particle packed bed energy storage system has advantages such as low costs and wide temperature ranges,which can be combined with solar thermal power generation systems to solve the inherent volatility and discontinuity of renewable *** new materials with low costs and excellent storage performances is one of the eternal research hotspots in the field of energy *** paper innovatively uses sintered ore particles as energy storage material and studies the effect of particle size on the airflow resistance characteristics,energy storage characteristics,and thermocline evolution characteristics of the packed bed through thermal energy storage *** results indicate that for the particles in the macro scale,the smaller the particle,the lower the absolute permeability of the bed and the greater the airflow *** packed bed with smaller particles has a larger specific surface area,larger bulk mass,and smaller bed ***,the packed beds with smaller particles have better thermocline characteristics,less irreversible loss,and can achieve higher thermal efficiency and higher exergy efficiency in the heat storage *** cycle thermal efficiency in packed beds with 25-40 mm,16-25 mm,and 10-16 mm particles is 53.58%,56.27%,and 57.60%,respectively,and the cycle exergy efficiency is 61.81%,69.25%,and 74.13%,***,this paper also studies the effect of discharging airflow rates on thermal storage *** experimental results indicate that suitable discharging strategies should be selected based on different heat demands.

关键词： airflow resistance particle packed bed thermal energy storage thermocline evolution