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Cucurbit[7]uril-threaded flexible organic frameworks: Quantitative polycatenation through dynamic covalent chemistry

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Chinese Chemical Letters 2022年第4期33卷 1988-1992页

作者： Qian Li Jian-Da Sun Bo Yang Hui Wang dan-wei Zhang Da Ma Zhan-Ting Li Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

A three-dimensional flexible organic framework FOF-1 has been synthesized from the condensation of a tetratopic acylhydrazine and a rigid 4,4-diphenyl-4,4-bipyridinium dialdehyde in water through the quantitative formation of hydrazone bond. FOF-1 is further applied to construct a polycatenane framework FOF-pc-1 through the quantitative cucurbit[7]uril encapsulation for the diphenylbipyridinium subunits of the framework by making use of the dynamic nature of the hydrazone bond in water. The bipyridinium subunits in both frameworks can be reduced their radical cation counterparts to produce conjugated radical cation-linked dynamic organic frameworks rc-FOF-1 or rc-FOF-pc-1. Polycatenation is revealed to enhance the stability of the dynamic frameworks in water, whereas depolycatenation can be reached for both FOF-pc-1 and rc-FOF-pc-1 by using a ferrocene guest to form a more stable complex with CB[7].

关键词： Polycatenation Flexible organic framework Dynamic covalent chemistry Cucurbituril Bipyridinium Radical cation

Equilibrium Reinsurance Strategy and Mean Residual Life Function

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 758-777页

作者： dan-ping LI Lv CHEN Lin-yi QIAN wei WANG School of Statistics Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOEEast China Normal UniversityShanghai 200062China Academy of Statistics and Interdisciplinary Sciences Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOEEast China Normal UniversityShanghai 200062China School of Mathematics and Statistics Ningbo UniversityNingbo 315211China

In this paper,we analyze the relationship between the equilibrium reinsurance strategy and the tail of the distribution of the *** Mean Residual Life(MRL)has a close relationship with the tail of the distribution,we consider two classes of risk distributions,Decreasing Mean Residual Life(DMRL)and Increasing Mean Residual Life(IMRL)distributions,which can be used to classify light-tailed and heavy-tailed distributions,*** assume that the underlying risk process is modelled by the classical CramérLundberg model *** the mean-variance criterion,by solving the extended Hamilton-Jacobi-Bellman equation,we derive the equilibrium reinsurance strategy for the insurer and the reinsurer under DMRL and IMRL,***,we analyze how to choose the reinsurance premium to make the insurer and the reinsurer agree with the same reinsurance *** find that under the case of DMRL,if the distribution and the risk aversions satisfy certain conditions,the insurer and the reinsurer can adopt a reinsurance premium to agree on a reinsurance strategy,and under the case of IMRL,the insurer and the reinsurer can only agree with each other that the insurer do not purchase the reinsurance.

关键词： mean residual life excess-of-loss reinsurance insurer reinsurer stochastic control

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A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

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Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingming Wen Jiayun dan Youyuan Jiang Guangchao wei Jiaxin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Schoolof Transportation and Vehicle Enginering Shandong University of TechnologyZibo255000China

Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex phase change process of iron ore particles in this zone is still not well *** this study,a novel one-dimensional(1D)unsteady phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore *** model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was *** results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption ***,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movement of the phase interface and pro-longing the melting duration of the *** the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting *** the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4%and 8.3%,*** the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve *** the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Cohesive zone Heat transfer Phase change

A cucurbit[8]uril-stabilized 3D charge transfer supramolecular polymer with a remarkable confinement effect for enhanced photocatalytic proton reduction and thioether oxidation

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Organic Chemistry Frontiers 2022年第5期9卷 1327-1335页

作者： Zhuo Lei Qian Li Jian-Da Sun Ze-Kun Wang Hui Wang Zhan-Ting Li dan-wei Zhang Department of Chemistry Shanghai Key Laboratory of Molecular CatalysisFudan UniversityShanghai 200438China

A highly water-soluble tetrahedral compound T1 that contains one tetraphenylmethane core and four 2-oxynaphthelene-CH_(2)-4,4’-bipyridinium(NP-CH_(2)-DIPY)side arms has been *** experi-ments reveal that NP-CH_(2)-BIPY undergoes antiparallel dimerization which is stabilized by two charge transfer interactions with NP as an electron-rich donor and BIPY as an electron-deficient acceptor.

关键词： stabilized charge transfer

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陶粒窑协同处置重金属污染土实例研究分析

砖瓦 2024年第1期 43-46页

作者：何汇洲张宪芝刘松韦丹丰夏惠承浙江寰龙环境科技有限公司浙江衢州324400

针对本研究中污染土项目的土壤主要是以砷、镍、六价铬等重金属污染物超标为主的基本情况,结合各污染物热力学平衡的特性,专门制定了烧成制度,以最大化固化重金属。通过生产过程和结果监测表明:三大重金属取得了良好的固化效果,固化率... 详细信息

针对本研究中污染土项目的土壤主要是以砷、镍、六价铬等重金属污染物超标为主的基本情况,结合各污染物热力学平衡的特性,专门制定了烧成制度,以最大化固化重金属。通过生产过程和结果监测表明:三大重金属取得了良好的固化效果,固化率均达到90%以上。同时,生产出筒压强度1.2MPa、堆积密度394kg/m3的超轻陶粒,为陶粒窑协同处置污染土积累了实践经验,为今后污染土的资源化利用提供了陶粒窑协同处置的新出路。

关键词：陶粒窑协同处置重金属污染土壤

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Relationship of Retinal Nerve Fiber Layer Thickness and Retinal Vessel Calibers with Cognitive Impairment in the Asymptomatic Polyvascular Abnormalities Population

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Biomedical and Environmental Sciences 2024年第2期37卷 196-203页

作者： WANG dan dan WANG An Xin ZHANG Xiao Li wei Wen Bin WU Shou Ling ZHAO Xing Quan Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China China National Clinical Research Center for Neurological Diseases Beijing 100070China Beijing Tongren Eye Center Beijing Key Laboratory of Ophthalmology and Visual ScienceBeijing Tongren HospitalCapital Medical UniversityBeijing 100005China Department of Cardiology Kailuan HospitalTangshan 063001HebeiChina

Objective Cognitive impairment(CI)in older individuals has a high morbidity rate worldwide,with poor diagnostic methods and susceptible population *** study aimed to investigate the relationship between different retinal metrics and CI in a particular population,emphasizing polyvascular *** We collected information from the Asymptomatic Polyvascular Abnormalities Community Study on retinal vessel calibers,retinal nerve fiber layer(RNFL)thickness,and cognitive function of 3,785participants,aged 40 years or *** regression was used to analyze the relationship between retinal metrics and cognitive *** stratified by different vascular statuses were also *** RNFL thickness was significantly thinner in the CI group(odds ratio:0.973,95%confidence interval:0.953–0.994).In the subgroup analysis,the difference still existed in the non-intracranial arterial stenosis,non-extracranial carotid arterial stenosis,and peripheral arterial disease subgroups(P<0.05).Conclusion A thin RNFL is associated with CI,especially in people with non-large vessel *** underlying small vessel change in RNFL and CI should be investigated in the future.

关键词： Retinal nerve fiber layer Cognitive impairment Polyvascular abnormality

Analysis of orthogonal multi-matching pursuit under restricted isometry property

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Science China Mathematics 2014年第10期57卷 2179-2188页

作者： dan wei School of Mathematics and Statistics Guangdong University of Finance & Economics

Orthogonal multi-matching pursuit(OMMP)is a natural extension of orthogonal matching pursuit(OMP)in the sense that N(N≥1)indices are selected per iteration instead of *** this paper,the theoretical performance of OMMP under the restricted isometry property(RIP)is *** demonstrate that OMMP can exactly recover any K-sparse signal from fewer observations y=φx,provided that the sampling matrixφsatisfiesδKN-N+1+(K/N)^(1/2)θKN-N+1,N<***,the performance of OMMP for support recovery from noisy observations is also *** is shown that,for l_2 bounded and l_∞bounded noisy cases,OMMP can recover the true support of any K-sparse signal under conditions on the restricted isometry property of the sampling matrixφand the minimum magnitude of the nonzero components of the signal.

关键词：匹配追踪等距性正交采样矩阵 OMP RIP 信号性能

Micro-sized nanoaggregates:Spray-drying-assisted fabrication and applications

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Particuology 2024年第2期85卷 22-48页

作者： dan-Lei Yang Rong-Kun Liu Yan wei Qian Sun Jie-Xin Wang School of Life Sciences and Chemical Engineering Jiangsu Second Normal UniversityNanjing210013China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning530004China

The applications of nanoparticles suffer from their extremely small size and intrinsic trend of *** nanoparticles to form micro-sized nanoaggregates(MNAs)with increased size,ordered structure,as well as controllable size,shape,and morphology is a crucial step in various fields of science and technology to maintain the unique characteristics of nanoparticles while obtaining greatly enhanced or new performance at the *** structure of MNAs prominently affects their functionality,which is determined by the arrangement of nanoparticles and the interaction between primary *** methods have been proposed to prepare the MNAs,in which spray-drying technology stands out considering the feasibility,scalability for industry,cost,and *** assembly of nanoparticles through spray-drying under tunable process parameters yields diverse physical properties and structural arrangements of nanoparticles of the MNAs,they therefore exhibit enormous potential in a wide range of application *** review presents the construction and applications of spray-dried *** factors that influence the size,morphology,and structure of the MNAs are discussed in *** addition,the outstanding application performance resulting from the tightly packed nanoparticles in regular-shaped MNAs obtained by the spray-drying process is illustrated.

关键词： Spray-drying Micro-sized nanoaggregates Applications

Application of StrucGP in medical immunology:site-specific N-glycoproteomic analysis of macrophages

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Frontiers of Medicine 2023年第2期17卷 304-316页

作者： Pengfei Li Zexuan Chen Shanshan You Yintai Xu Zhifang Hao Didi Liu Jiechen Shen Bojing Zhu wei dan Shisheng Sun College of Life Sciences Northwest UniversityXi’an 710069China

The structure of N-glycans on specific proteins can regulate innate and adaptive immunity via sensing environmental ***,the structural diversity of N-glycans poses analytical challenges that limit the exploration of specific glycosylation *** this work,we used THP-1-derived macrophages as examples to show the vast potential of a N-glycan structural interpretation tool StrucGP in N-glycoproteomic *** intact glycopeptides of macrophages were enriched and analyzed using mass spectrometry(MS)-based glycoproteomic approaches,followed by the large-scale mapping of site-specific glycan structures via *** revealed that bisected GlcNAc,core fucosylated,and sialylated glycans(e.g.,HexNAc4Hex5Fuc1Neu5Ac1,N4H5F1S1)were increased in M1 and M2 macrophages,especially in the *** findings indicated that these structures may be closely related to macrophage *** addition,a high level of glycosylated PD-L1 was observed in M1 macrophages,and the LacNAc moiety was detected at Asn-192 and Asn-200 of PD-L1,and Asn-200 contained Lewis *** precision structural interpretation of site-specific glycans and subsequent intervention of target glycoproteins and related glycosyltransferases are of great value for the development of new diagnostic and therapeutic approaches for different diseases.

关键词： macrophage glycoproteome glycopeptides N-glycan structures PD-L1