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Polymer-to-Monomers Chemically Recyclable Poly(imide-imine)Plastics with Extreme-Condition Resistance and Flame Retardancy

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Chinese Journal of Polymer Science 2024年第10期42卷 1525-1535,I0012页

作者： zhen-yu wang Xiao-Kong liu State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun130012China

Polyimides are a family of high-tech plastics that have irreplaceable applications in the fields of aerospace,defense,and opto-electronics,but polyimides are difficult to be reprocessed and recycled at the end of their service life,resulting in a significant waste of ***,it is of great significance to develop recyclable polyimides with comparable properties to the commercial ***,we report a novel polymer-to-monomers chemically recyclable poly(imide-imine)(PtM-CR-PII)plastic,synthesized by cross-linking the amine-terminated aromatic bisimide monomer and the hexa-vanillin terminated cyclophosphazene monomer via dynamic imine *** PtM-CR-PII plastic exhibits comparable mechanical and thermal properties as well as chemical stability to the commercial *** PtM-CR-PII plastic possesses a high Young’s modulus of≈3.2 GPa and a tensile strength as high as≈108 MPa,which also exhibits high thermal stability with a glass transition temperature of≈220℃.Moreover,the PtM-CR-PII plastic exhibits outstanding waterproofness,acid/alkali-resistance,and solvent-resistance,its appearance and mechanical properties can be well maintained after long-term soaking in water,highly concentrated acid and base,and various organic ***,the cyclophosphazene moieties endow the PtM-CR-PII plastic with excellent flame *** PtM-CR-PII plastic exhibits the highest UL-94 flame-retarding rating of V-0 and a limiting oxygen index(LOI)value of 45.5%.Importantly,the PtM-CR-PII plastic can be depolymerized in an organic solvents-acid mixture medium at room temperature,allowing easy separation and recovery of both monomers in high *** recovered pure monomers can be used to regenerate new PtM-CR-PII plastics,enabling sustainable polymer-monomers-polymer circulation.

关键词： Chemical recyclability Polyimides Polyimines Dynamic imine bonds Mechanical properties Chemical stability

Enhanced quality of Al2O3/SiC gate stack via microwave plasma annealing

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Rare Metals 2024年第10期43卷 5362-5371页

作者： Nan-Nan You Xin-yu liu Qian Zhang zhen wang Jia-yi wang Yang Xu Xiu-Yan Li yu-zheng guo Sheng-Kai wang High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of Microelectronics of the Chinese Academy of Sciences School of Integrated Circuits University of Chinese Academy of Sciences School of Electrical Engineering and Automation Wuhan University Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University

The high-quality gate dielectric on silicon carbide （SiC） surface is critical to fabricate high-performance SiC metal-oxide-semiconductor field-effect transistors（MOSFETs）.This research employs microwave plasma annealing （MPA） to obtain high-quality Al2O3/SiC gate *** designing MPA atmosphere and optimizing the plasma power,the SiC MOS capacitor with a Al2O3dielectric film shows the enhanced *** interface state density is reduced by 1 order of magnitude to 6×1011cm-2·eV-1,the breakdown electric field is increased,and the voltage shift is effectively suppressed Besides,the mechanism of MPA process is discussed in terms of the thermal effect and reactant species.X-ray photoelectron spectroscopy （XPS） results unveil oxygen plasma plays the main *** plasma power during the MPA process results in defect repairs of the firstneighbor Al-O bonding and partial removal of Al-O-H bond from the interface *** study demonstrates that MPA process is an effective option to realize highquality dielectric and interface on SiC.

关键词： Al2O3 Defect repairs Metal–oxide–semiconductor Microwave plasma annealing Silicon carbide X-ray photoelectron spectroscopy

Decentralized Primary Frequency Regulation for Hybrid Multi-terminal Direct Current Power Systems Considering Multi-source Enhancement

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 958-970页

作者： Jialiang Wu zhen wang Ruixu liu yu Shan Chenxuan wang the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Economic Research Institute of State Grid Zhejiang Electric Power Co. Ltd.Hangzhou 310016China

Hybrid multi-terminal direct current(MTDC)transmission technology has been a research focus,and primary frequency regulation(FR)improvement in the receiving-end system is one of the problems to be *** paper presents a decentralized primary FR scheme for hybrid MTDC power systems considering multi-source enhancement to help suppress frequency disturbance in the receiving-end *** the converters only need local frequency or DC voltage signal input to respond to system disturbance without communication or a control center,i.e.,a decentralized control *** proposed scheme can activate appropriate power sources to assist in FR in various system disturbance severities with fine-designed thresholds,ensuring sufficient utilization of each power *** better balance FR performance and FR resource participation,an evaluation index is proposed and the parameter optimization problem is further ***,the validity of the proposed scheme is verified by simulations in MATLAB/Simulink.

关键词： Decentralized control scheme primary frequency regulation(FR) rate of change of frequency(ROCOF) system frequency disturbance

Monotonic mechanical behaviour of compacted completely decomposed granite with various inclusion levels of incineration bottom ash

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第8期25卷 670-679页

作者： Han-Lin wang Cheng-Shuang yiN Qian-yi ZHANG Qi-Wei liu zhen-yu yiN dong-Xing XUAN Askar KHASANOV Research Center for Advanced Underground Space Technologies of Hunan University Changsha 410082China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha 410082China College of Civil Engineering Hunan UniversityChangsha 410082China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Applied and Theoretical Mechanics Samarkand State UniversitySamarkandUzbekistan

1 Introduction Completely decomposed granite(CDG)is widely distributed in South China(Xu et al.,2022;wang et al.,2023).The parent granite rock mass gradually loses features during the weathering process,and thus needs to be reinforced when used(Lan et al.,2003;Dassekpo et al.,2017;Alamanis et al.,2021).On the other hand,considering the huge demand for construction materials and limited natural resources,it is increasingly important to fully utilize solid waste(Gruhler et al.,2019;Anagnostopoulos et al.,2020;Jiang et al.,2022,2023a,2023b).With high strength and environment-friendly characteristics,incineration bottom ash(IBA)seems to be a suitable reinforcement material for CDG(Ahmed and Khalid,2011;Alhassan and Tankó,2012;Toraldo et al.,2013;Lynn et al.,2017;Xuan et al.,2018;Tang et al.,2020).

关键词： incineration behaviour utilize

Selenopeptide nanomedicine ameliorates atherosclerosis by reducing monocyte adhesions and inflammations

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Nano Research 2024年第7期17卷 6332-6341页

作者： zhen Luo yuxing Jiang Zimo liu Lamei guo Li Zhang Hongtao Rong Zhongyu Duan Hongwen Liang Aili Zhang Lei wang yu yi Hao wang CAS Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology(NCNST)No.11 BeiyitiaoZhongguancunBeijing 100190China School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China Tianjin Medical University General Hospital Tianjin 300052China University of Chinese Academy of Sciences Beijing 100049China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China College of Pharmacy Chongqing Medical UniversityChongqing 400016China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Atherosclerosis is an inflammatory disease that may cause severe heart disease and *** pharmacotherapy for atherosclerosis shows limited *** the progression of atherosclerosis,monocyte adhesions and inflammatory macrophages play vital ***,precise regulations of inflammatory immune microenvironments in pathological tissues remain ***,we report an atherosclerotic plaque-targeted selenopeptide nanomedicine for inhibiting atherosclerosis progression by reducing monocyte adhesions and inflammation of *** targeted nanomedicine has 2.2-fold enhancement in atherosclerotic lesion *** oxidation-responsibility of selenopeptide enables eliminations of reactive oxygen species and specific release of anti-inflammatory drugs,thereby reducing inflammation responses of ***,we find the oxidative metabolite of selenopeptide,octadecyl selenite,can bind to P-selectin in a high affinity with a dissociation constant of 1.5μ*** in situ generated active seleno-species further inhibit monocyte adhesions for anti-inflammation in *** local regulations of monocyte adhesions and inflammations,the selenopeptide nanomedicine achieves 2.6-fold improvement in atherosclerotic plaque inhibition compared with simvastatin in the atherosclerosis mouse ***,the selenopeptide nanomedicine also displays excellent biological safety in both mice and rhesus *** study provides a safe and effective platform for regulating inflammatory immune microenvironments for inflammatory diseases such as atherosclerosis.

关键词： selenopeptide self-assembly atherosclerosis monocyte adhesion anti-inflammation

A novel strategy of tannery sludge disposal–converting into biochar and reusing for Cr(Ⅵ)removal from tannery wastewater

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Journal of Environmental Sciences 2024年第4期138卷 637-649页

作者： Zhiwei Li Di yu Xingdong wang Xuejiao liu zhen Xu yin wang CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in BeilunNingbo 315830China Key Laboratory of Urban Environment and Health Ningbo Observatio

Tannery sludge with high chromium content has been identified as hazardous solid waste due to its potential toxic *** safety disposal and valorization of the tannery sludge remains a *** this study,the chromium stabilization mechanism was systematically investigated during chromium-rich tannery sludge was converted to biochar and the removal performance of the sludge biochar(SBC)for Cr(Ⅵ)from tannery wastewater was also *** results showed that increase in pyrolysis temperature was conductive to the stabilization of Cr and significant reduction of the proportion of Cr(Ⅵ)in *** was confirmed that the stabilization of chromium mainly was attributed to the embedding of chromium in the C matrix and the transformation of the chromium-containing substances from the amorphous Cr(OH)_(3)to the crystalline state,such as(FeMg)Cr_(2)O_(5).The biochar presented high adsorption capacity of Cr(Ⅵ)at low pH and the maximal theoretical adsorption capacity of SBC produced at 800°C can reach 352 mg Cr(Ⅵ)/g,the process of which can be well expressed by Langmuir adsorption isotherm and pseudo second order *** electrostatic effect and reduction reaction were dominantly responsible for the Cr(Ⅵ)adsorption by ***,this study provided a novel strategy for the harmless disposal and resource utilization for the solid waste containing chromium in leather industry.

关键词： Chromium-rich tannery sludge Pyrolysis Biochar Stabilizationmechanisms Cr(Ⅵ)adsorption

Track-Pattern-Based Characteristics of Extratropical Transitioning Tropical Cyclones in the Western North Pacific

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Advances in Atmospheric Sciences 2024年第6期41卷 1251-1263页

作者： Hong HUANG Dan WU yuan wang zhen wang yu liu College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410000China No.31631 Army of PLA Huizhou 516000China School of Atmospheric Sciences and Key Laboratory of Mesoscale Severe Weather/Ministry of Education Nanjing 210023China No.93721 Army of PLA Shuozhou 038300China

Based on the Regional Specialized Meteorological Center(RSMC)Tokyo-Typhoon Center best-track data and the NCEP-NCAR reanalysis dataset,extratropical transitioning(ET)tropical cyclones(ETCs)over the western North Pacific(WNP)during 1951–2021 are classified into six clusters using the fuzzy c-means clustering method(FCM)according to their track *** characteristics of the six hard-clustered ETCs with the highest membership coefficient are *** tropical cyclones(TCs)that were assigned to clusters C2,C5,and C6 made landfall over eastern Asian countries,which severely threatened these *** landfalling TCs,93.2%completed their ET after landfall,whereas 39.8%of ETCs completed their transition within one *** frequency of ETCs over the WNP has decreased in the past four decades,wherein cluster C5 demonstrated a significant decrease on both interannual and interdecadal timescales with the expansion and intensification of the western Pacific subtropical high(WPSH).This large-scale circulation pattern is favorable for C2 and causes it to become the dominant track pattern,owning to it containing the largest number of intensifying ETCs among the six clusters,a number that has increased insignificantly over the past four *** surface roughness variation and three-dimensional background circulation led to C5 containing the maximum number of landfalling TCs and a minimum number of intensifying *** results will facilitate a better understanding of the spatiotemporal distributions of ET events and associated environment background fields,which will benefit the effective monitoring of these events over the WNP.

关键词： Western North Pacific tropical cyclone extratropical transition fuzzy c-means clustering method

NSUN2 mediates distinct pathways to regulate enterovirus 71 replication

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Virologica Sinica 2024年第4期39卷 574-586页

作者： Lishi liu zhen Chen Kui Zhang Haojie Hao Li Ma Haizhou liu Baocheng yu Shuang Ding Xueyan Zhang Miao Zhu Xiang guo yi liu Haibin liu fang Huang Ke Peng Wuxiang Guan Center for Emerging Infectious Diseases Wuhan Institute of VirologyCenter for Biosafety Mega-ScienceChinese Academy of SciencesWuhanHubei430071China University of Chinese Academy of Sciences Beijing100049China Hubei Jiangxia Laboratory WuhanHubei430200China

Increasing evidences suggest that the methyltransferase NSUN2 catalyzes 5-methylcytosine(m5C)modifications on viral RNAs,which are essential for the replication of various *** the function of m5C deposition is well characterized,other potential roles of NSUN2 in regulating viral replication remain largely *** this study,the m5C modified residues catalyzed by NSUN2 on enterovirus 71(EV71)RNAs were ***2,along with m5C modifications,played multiple roles during the EV71 life *** m5C modified nucleotides increased the translational efficiency and stability of EV71 ***,NSUN2 was found to target the viral protein VP1 for binding and promote its stability by inhibiting the ***,both viral replication and pathogenicity in mice were largely attenuated when functional m5C residues were *** together,this study characterizes distinct pathways mediated by NSUN2 in regulating EV71 replication,and highlights the importance of its catalyzed m5C modifications on EV71 RNAs for the viral replication and pathogenicity.

关键词： NSUN2 5-methylcytosine Enterovirus 71 Ubiquitination Pathogenicity

Hotspots and trends of risk factors in gastric cancer: A visualization and bibliometric analysis

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 2200-2218页

作者： Meng Li Ning Gao Shao-Li wang yu-Feng guo zhen liu Department of Gastroenterology Guang'anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China Department of Acupuncture and Moxibustion Guang'anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China

BACKGROUND The lack of specific symptoms of gastric cancer(GC)causes great challenges in its early *** it is essential to identify the risk factors for early diagnosis and treatment of GC and to improve the survival *** To assist physicians in identifying changes in the output of publications and research hotspots related to risk factors for GC,constructing a list of key risk factors,and providing a reference for early identification of patients at high risk for *** Research articles on risk factors for GC were searched in the Web of Science core collection,and relevant information was extracted after *** literature was analyzed using Microsoft Excel 2019,CiteSpace V,and VOSviewer *** A total of 2514 papers from 72 countries and 2507 research institutions were ***(n=1061),National Cancer Center(n=138),and Shoichiro Tsugane(n=36)were the most productive country,institution,or author,*** research hotspots in the study of risk factors for GC are summarized in four areas,namely:Helicobacter pylori(***)infection,single nucleotide polymorphism,bio-diagnostic markers,and GC risk prediction *** In this study,we found that *** infection is the most significant risk factor for GC;single-nucleotide polymorphism(SNP)is the most dominant genetic factor for GC;bio-diagnostic markers are the most promising diagnostic modality for *** risk prediction models are the latest current research *** conclude that the most important risk factors for the development of GC are *** infection,SNP,smoking,diet,and alcohol.

关键词： Gastric cancer Risk factor Bibliometric Research hotspots VOSviewer