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Non-linear Radical Additions-Coupling Polymerization of Monovinyl Monomers towards Polymer Networks: Theory, Tunability and Heritable Architecture

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Chinese Journal of Polymer Science 2022年第12期40卷 1623-1630,I0008页

作者： Li-mei Ren Cheng-lin Li Qi Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science&Engineering Zhejiang UniversityHangzhou 310027China Current address:Zhejiang University-University of Edinburgh Institute Zhejiang University School of Medicineand Key Laboratory of Tissue Engineering and Regenerative Medicine of Zhejiang ProvinceZhejiang University School of MedicineHangzhou 310027China

Exploring new polymerization strategy for current available monomers is a big challenge in polymer science. Here we re-investigate radical polymerization of monovinyl monomer(MVM) initiated by uniform branched polyfunctional initiator(PFI), which is termed non-linear radical additions-coupling polymerization(NLRAs CP). In NLRAs CP, both addition and coupling reactions of radical contribute to the construction of the polymer chains, which leads to continuous growth of branch topology. Theoretical analysis of NLRAs CP predicts that the gelation is determined by the functionality of PFI(a), the extent of initiation of the PFI(q) and the termination factor of radical(φ). NLRAs CPs of styrene and methyl methacrylate promoted by Cu(0)/MeTREN or Mn_(2)(CO)_(10)/visible light were conducted. After the cleavage of incorporated PFI fragment or junctions in the network, the network was transformed to linear chains having almost the same structure as segmental chains in the precursor network. This allows the reverse deducing the network structure from its cleaved products. It has been proven that NLRAs CP includes stepwise initiation of PFI, chain-growth of segmental chains and successive endlinking of macroradicals derived from PFI. The three parameters related to the gelation process, a, q and φ, were adjusted via binary PFI, the feed ratio of [Mn_(2)(CO)_(10)]/[PFI] and addition of non-homopolymerizable comonomer respectively. The minimum values of a and q, and the minimum amount of comonomer required for gelation were determined,which can be applied to estimate φ of various macroradicals. NLRAs CP opens a general and facile strategy for synthesis of a variety of polymer networks with heritable architecture by one-pot polymerization of various MVMs.

关键词： Non-linear radical additions-coupling polymerization Monovinyl monomer Polyfunctional initiator Polymer network Theory

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Study on the mechanism of hydrodesulfurization of tetrahydrothiophene catalyzed by nickel phosphide

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Petroleum Science 2022年第3期19卷 1390-1400页

作者： Chuan-Tao Zhu Li-Qiang Zhang mei-ling Zhou Xin-Wei Wang zheng-Da Yang Ri-Yi lin De-Wei Yang College of New Energy China University of PetroleumQingdao266580China

Hydrodesulfurization(HDS)reaction can significantly reduce the viscosity and sulfur content of heavy oil,while the HDS reaction mechanism of tetrahydrothiophene as the main sulfide in heavy oil is still *** HDS experiment of tetrahydrothiophene catalyzed by nickel phosphide(Ni_(2)P)is carried out at 200-300°*** results indicate that the H_(2)S production under the catalysis of Ni_(2)P increases obviously within 200-250°*** main gas products of HDS reaction are butane,butene and H_(2)***,the mechanism of tetrahydrothiophene catalyzed by Ni_(2)P is analyzed based on Density Functional Theory(DFT).It is revealed that the adsorption model is most stable when tetrahydrothiophene is vertically adsorbed on the V-Ni-Hcp1 site of Ni_(2)P(001).The C-S bond is elongated and the C-C bond is shortened after ***(HYD)is the most possible reaction route of tetrahydrothiophene on Ni_(2)P(001)*** are two routes with the lowest activation energy,which are C_(4)H_(8)S→C_(4)H_(8)SH^(*)→C_(4)H_(9)SH^(*)→C_(4)H_(10)+H_(2)S and C_(4)H_(8)S→C_(4)H9S^(*)→C_(4)H_(9)^(*)+SH^(*)→C_(4)H_(10)+H_(2)*** and H_(2)S are produced in the reaction,corresponding to the experimental *** study provides a basis for understanding of the HDS mechanism of tetrahydrothiophene catalyzed by Ni_(2)P.

关键词： Tetrahydrothiophene Nickel phosphide Hydrodesulfurization Hydrogen sulfide DFT

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Field experiments of NR-PSS for large synchronous generators on a 300MW machine in Baishan Hydro Plant

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Science China(Technological Sciences) 2007年第4期50卷 516-520页

作者： LU Qiang mei ShengWei zheng ShaoMing State Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

To verify the performance of NR-PSS (Nonlinear Robust Power System Stabilizer) for large synchronous generators, field experiments were carried out on a 300 MW generator in Baishan Hydro Plant of Northeast China Power Grid. The experiment results show that NR-PSS can improve the generator damping and enhance system stability remarkably.

关键词： nonlinear robust power system stabilizer large synchronous generators field experiment

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虫草素通过抑制氧化应激与铁死亡减轻庆大霉素诱导的肾损伤

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中国药理学通报 2025年第1期41卷 65-70页

作者：岳琳徐草梅钱敏燕张雯婷郑晓陈陆俊蒋敬庭胡楠苏州大学附属第三医院/常州市第一人民医院药学部江苏常州213003 苏州大学附属第三医院肿瘤生物诊疗中心江苏常州213003

目的探讨虫草素(cordycepin,COR)减轻庆大霉素(gentamicin,GEN)肾毒性的作用及其抑制GEN诱导的氧化应激和细胞铁死亡的分子机制。方法将SD大鼠分为对照组、GEN组与GEN+COR组3组,动物模型构建成功后,检测各组大鼠血清肌酐和尿素氮水平,H... 详细信息

目的探讨虫草素(cordycepin,COR)减轻庆大霉素(gentamicin,GEN)肾毒性的作用及其抑制GEN诱导的氧化应激和细胞铁死亡的分子机制。方法将SD大鼠分为对照组、GEN组与GEN+COR组3组,动物模型构建成功后,检测各组大鼠血清肌酐和尿素氮水平,HE染色评价肾脏组织损伤程度。另外,检测各组SD大鼠肾脏组织中丙二醛和谷胱甘肽含量,并通过Western blot的方法分析细胞铁死亡标志蛋白GPX4、SLC7A11表达。结果与对照组相比,GEN组大鼠血清肌酐、尿素氮明显升高(P<0.01),同时给予50 mg·kg-1 COR后有效降低肌酐与尿素氮水平,HE结果也显示COR能够缓解GEN造成的肾脏组织损伤;COR可逆转GEN造成的大鼠肾脏组织中丙二醛水平升高与谷胱甘肽水平下降。同时,COR能够恢复GEN诱导的GPX4、SLC7A11蛋白水平下降。结论COR能够通过减轻细胞氧化应激与铁死亡缓解GEN造成的肾损伤。

关键词：庆大霉素肾损伤虫草素氧化应激铁死亡 GPX4

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Quantitative Proteomics Analysis Identifies the Potential Mechanism Underlying Yellow-Green Leave Mutant in Wheat

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Phyton-International Journal of Experimental Botany 2021年第4期90卷 1147-1159页

作者： Wei zheng zheng Shi mei Long Yuncheng Liao College of Agronomy Northwest A&F UniversityYangling712100China

Enhancing photosynthesis efficiency is considered as one of the most crucial targets during wheat ***,the molecular basis underlying high photosynthesis efficiency is not well understood up to *** this study,we investigated the protein expression profile of wheat Jimai5265yg mutant,which is a yellow-green mutant with chlorophylls b deficiency but high photosynthesis *** TMT-labeling quantitative proteomics analysis,a total of 72 differential expressed proteins(DEPs)were obtained between the mutant and wild type(WT).GO analysis found that they significantly enriched in thylakoid membrane,pigment binding,magnesium chelatase activity and response to light *** analysis showed that they involved in photosynthesis-antenna protein as well as porphyrin and chlorophyll ***,118 RNA editing events were found between mutant and WT *** A to C editing in the 3-UTR of TraesCS6D02G401500 lead to its high expression in mutant through removing the inhibition of tae-miR9781,which might have vital role in regulating the yellow-green *** study provided some useful clues about the molecular basis of Jimai5265yg mutant as well as chlorophylls metabolism in wheat.

关键词： Wheat photosynthesis yellow-green mutant quantitative proteomics

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Chinese multi-document personal name disambiguation

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High Technology Letters 2005年第3期11卷 280-283页

作者： Wang Houfeng（王厚峰） mei zheng Department of Computer Science and Technology Peking University Beijing 100871 P. R. China

This paper presents a new approach to determining whether an interested personal name across doeuments refers to the same entity. Firstly,three vectors for each text are formed： the personal name Boolean vectors denoting whether a personal name occurs the text the biographical word Boolean vector representing title, occupation and so forth, and the feature vector with real values. Then, by combining a heuristic strategy based on Boolean vectors with an agglomeratie clustering algorithm based on feature vectors, it seeks to resolve multi-document personal name coreference. Experimental results show that this approach achieves a good performance by testing on ＂Wang Gang＂ corpus.

关键词： personal name disambiguation Chinese multi-document heuristic strategy. agglomerative clustering

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Nitrogen removal from sludge dewatering effluent through anaerobic ammonia oxidation process

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Journal of Environmental Sciences 2005年第6期17卷 1030-1033页

作者： ZHANG Shao-hui zheng Ping HUA Yu-mei Department of Environmental Engineering Zhejiang University Hangzhou 310029 China

Anaerobic ammonia oxidation（Anammox） process is a novel and promising wastewater nitrogen removal process. The feasibility of transition of Anammox from denitrification and the performance of lab-scale Anammox biofilm reactor were investigated with sludge dewatering effluent. The results showed that Anammox process could be successfully started up after cultivation of denitrification biofilm and using it as inoculum. The transition of Anammox from denitrification was accomplished within 85 d. Anammox process was found suitable to remove ammonia from sludge dewatering effluent. The effluent ammonia concentration was detected to be 23.11 mgN/L at HRT of 28 h when influent ammonia concentration was fed 245 mgN/L, which was less than that for the national discharge standard Ⅱ （25 rngN/L） of China. Volumetric total nitrogen loading rate was up to 584.99 mg TN/（L. d） at HRT of 17 h, while influent concentrations were kept 243.25 mg NH4＊ -N/L and 288.31 mg NO2^- -N/L.

关键词： denitrification Anammox sludge dewatering effluent nitrogen removal

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Synthesis and Water Uptake of Sulfonated Poly (phthalazinone ether sulfone ketone)/Polyacrylic Acid Proton Exchange Membranes

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Chinese Chemical Letters 2006年第7期17卷 965-968页

作者： Xue mei WU Gao Hong HE lin GAO Shuang GU zheng Wen HU Ping Jing YAO State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012

Novel SPPESK/PAA composite proton exchange membranes with semi-interpenetrating polymer network （sIPN） structure have been synthesized through the in-situ polymerization of acrylic acid （AA） in the presence of sulfonated poly （phthalazinone ether sulfone ketone）（SPPESK）. The composite membranes were identified by FT-IR analysis. Water uptake of the composite membranes was as high as 89.7% at 90℃, nearly one time higher than that of the corresponding SPPESK membrane.

关键词： Proton exchange membranes interpenetrating polymer network in-situ polymerization.

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PRMT5 determines the pattern of polyploidization and prevents liver from cirrhosis and carcinogenesis

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Journal of Genetics and Genomics 2023年第2期50卷 87-98页

作者： Jincheng Wang Xiang Huang Daoshan zheng Qiuling Li mei mei Shilai Bao State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China School of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

Human hepatocellular carcinoma(HCC)occurs almost exclusively in cirrhotic ***,we report that hepatic loss of protein arginine methyltransferase 5(PRMT5)in mice is sufficient to cause cirrhosis and HCC in a clinically relevant ***,pathological polyploidization induced by hepatic loss of PRMT5 promotes liver cirrhosis and hepatic tumorigenesis in aged *** loss of PRMT5 leads to hyperaccumulation of P21 and endoreplication-dependent formation of pathological mono-nuclear polyploid ***5 and symmetric dimethylation at histone H4 arginine 3(H4R3me2s)directly associate with chromatin of P21 to suppress its *** importantly,loss of P21 rescues the pathological mono-nuclear polyploidy and prevents PRMT5-deficiency-induced liver cirrhosis and ***,our results indicate that PRMT5-mediated symmetric dimethylation at histone H4 arginine 3(H4R3me2s)is crucial for preventing pathological polyploidization,liver cirrhosis and tumorigenesis in mouse liver.

关键词： Pathological polyploidizaion Hepatocellular carcinoma Cirrhosis PRMT5 Aging

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User association and resource allocation in green mobile edge networks using deep reinforcement learning

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The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 1-10,27页

作者： zheng Ying Sun Siyuan Wei Yifei Song mei School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

In order to meet the emerging requirements for high computational complexity, low delay and energy consumption of the 5 th generation wireless systems(5 G) network, ultra-dense networks(UDNs) combined with multi-access edge computing(MEC) can further improve network capacity and computing capability. In addition, the integration of green energy can effectively reduce the on-grid energy consumption of system and realize green computation. This paper studies the joint optimization of user association(UA) and resource allocation(RA) in MEC enabled UDNs under the green energy supply pattern, users need to perceive the green energy status of base stations(BSs) and choose the one with abundant resources to associate. To minimize the computation cost for all users, the optimization problem is formulated as a mixed integer nonlinear programming(MINLP) which is NP-hard. In order to solve the problem, a deep reinforcement learning(DRL)-based association and optimized allocation(DAOA) scheme is designed to solve it in two stages. The simulation results show that the proposed scheme has good performance in terms of computation cost and time out ratio, as well achieve load balancing potentially.

关键词： multi-access edge computing(MEC) ultra-dense networks(UDNs) deep reinforcement learning(DRL) user association(UA) resource allocation(RA) green energy

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