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The Stereocomplex Crystallites Improve the Stability of Biodegradable Poly(L-lactic acid)/Poly(D-lactic acid)Melt-Blown nonwovens

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Chinese Journal of Polymer Science 2025年第2期43卷 368-379页

作者： Jin-Shuo Yu Yue-wei Huan Hong-wei Pan Zhi-gang Liu Yan Zhao Zhi-Yong Tan Jun-Jia Bian Hui-Li Yang Hui-Liang zhang Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China College of Material and Engineering School of Chemical EngineeringEngineering Research Center of Synthetic Resin and Special FiberMinistry of EducationChangchun University of TechnologyChangchun130012China Shandong Fufeng Fermentation Co. Ltd.Shandong276600China national Engineering Research Center of Corn Deep Processing Jilin COFCO Biochemistry Co.Ltd.Changchun130033China

Poly(lactic acid)(PLA)is a biodegradable and eco-friendly polymer that is increasingly being incorporated into various applications in contemporary ***,the limited stability of PLA-based products remains a significant challenge for their broader use in various *** this study,poly(L-lactic acid)(PLLA)/poly(D-lactic acid)(PDLA)melt-blown nonwovens were prepared by melt *** structure,thermal properties,thermal stability,biodegradability and crystalline morphology of the melt-blown nonwovens were *** and wAXD confirmed the formation of stereocomplex(SC)crystallites in the PLLA *** storage modulus(G′),loss modulus(G″),and complex viscosity(∣η^(*)∣)of the PLLA/PDLA blend increased with an increase in SC crystallite *** thermal degradation temperatures of PLLA/PDLA melt-blown nonwovens increased with the incorporation of SC crystallites,and the maximum rate of decomposition increased to 385.5℃,thus enhancing the thermal *** with neat PLLA melt-blown nonwovens,the hydrophobicity of PLLA/PDLA melt-blown nonwovens was improved,and wCA increased to 139.7°.The SC crystallites were more resistant to degradation by proteinase K compared to neat ***,the degradation rate of PLLA/PDLA melt-blown nonwovens remained at a high *** work provides an effective strategy to obtain high-performance PLLA melt-blown nonwovens.

关键词： PLLA PDLA Melt-blown nonwovens Stereocomplex crystallites Thermal stability Enzymatic degradation

槽式聚光和纳米流体分频PVT系统设计与分析

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工程热物理学报 2025年第1期46卷 35-41页

作者：王刚张震姜铁骝东北电力大学能源与动力工程学院吉林132012

本文提出了一种基于槽式聚光器和氧化铟锡/乙二醇纳米流体分频器的新型太阳能光伏/光热系统。制备了氧化铟锡/乙二醇纳米流体并进行了性能测试。结果表明在全波长范围内,氧化铟锡/乙二醇纳米流体的平均透射率和平均吸收率分别为69.1%和3... 详细信息

本文提出了一种基于槽式聚光器和氧化铟锡/乙二醇纳米流体分频器的新型太阳能光伏/光热系统。制备了氧化铟锡/乙二醇纳米流体并进行了性能测试。结果表明在全波长范围内,氧化铟锡/乙二醇纳米流体的平均透射率和平均吸收率分别为69.1%和30.9%。对光伏/光热系统的光学性能进行分析,结果表明,PVT系统的总体光学效率约为89.38%。当南北方向的对日跟踪误差增加到0.2°时,光伏/光热系统的光学效率为84.14%。对光伏/光热系统进行了运行性能分析,结果表明,光伏子系统的光电转换效率为29.1%,光伏/光热系统整体的理论光电转换效率和系统的热效率分别为19.1%和19%。变参数分析的结果表明,提高光伏/光热系统的热效率可以通过适当增大纳米流体的入口流速、减小纳米流体的入口温度以及减小外部对流换热系数来实现。

关键词：太阳能氧化铟锡纳米流体槽式聚光器光伏/光热系统

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Self-reporting hypoxia-responsive supramolecular phototheranostic nanomaterials based on AIEgen and azocalixarene

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关键词： Hypoxia is a significant feature in most of solid tumors. Hence, developing hypoxia-responsive phototheranostic system is still a challenge. In this contribution, a supramolecular assembly strategy based on sulfonate-functionalized azocalixarene(SAC4A)and cationic aggregation-induced emission photosensitizer(namely TPA-H) was proposed for hypoxia-responsive bioimaging and photodynamic therapy(PDT). Upon supramolecular complexation of TPA-H and SAC4A through electrostatic interaction,the fluorescence and reactive oxygen species(ROS) generation of TPA-H were largely inhibited. In hypoxic tumors, the azo group of SAC4A can be reduced to aniline derivative and release the included TPA-H to recover its pristine fluorescence and ROS. Interestingly, the free TPA-H undergoes cell membrane-to-mitochondria translocation during cell imaging, achieving a real-time self-reporting PDT system. In vivo tumor imaging and therapy reveal that this as-prepared supramolecular complexes have good biosafety and efficient antitumor activity under hypoxia. Such hypoxia-responsive supramolecular photosensitizer system will enrich image-guided photodynamic therapy.

Science China Chemistry 2025年

作者： Xiao-w.n Han Guo-Ling zhang Pu Chen Jing zhang Guo-gang Shan Chun-Xuan Qi Ben-Zhong Tang Hai-Tao Feng AIE Research Center Shaanxi Key Laboratory of Phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences national & Local United Engineering Laboratory for Power Batteries Department of Chemistry Northeast Normal University School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong KongShenzhen (CUHK-Shenzhen)

Hypoxia is a significant feature in most of solid tumors. Hence, developing hypoxia-responsive phototheranostic system is still a challenge. In this contribution, a supramolecular assembly strategy based on sulfonate-functionalized azocalix[4]arene(SAC4A)and cationic aggregation-induced emission photosensitizer(namely TPA-H) was proposed for hypoxia-responsive bioimaging and photodynamic therapy(PDT). Upon supramolecular complexation of TPA-H and SAC4A through electrostatic interaction,the fluorescence and reactive oxygen species(ROS) generation of TPA-H were largely inhibited. In hypoxic tumors, the azo group of SAC4A can be reduced to aniline derivative and release the included TPA-H to recover its pristine fluorescence and ROS. Interestingly, the free TPA-H undergoes cell membrane-to-mitochondria translocation during cell imaging, achieving a real-time self-reporting PDT system. In vivo tumor imaging and therapy reveal that this as-prepared supramolecular complexes have good biosafety and efficient antitumor activity under hypoxia. Such hypoxia-responsive supramolecular photosensitizer system will enrich image-guided photodynamic therapy.

饱和地基多排孔列近场主动隔振问题的半解析BEM并行优化算法分析

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振动工程学报 2025年第1期38卷 54-67页

作者：时刚张浩郜新军郑州大学土木工程学院河南郑州450001

人工振动污染在国际上已被列入“七大环境公害”之一,多排孔列隔振是振动污染治理的一种方式。针对饱和地基中多排孔列近场主动隔振问题,基于饱和土半解析边界元法(BEM),分别建立了动力机器基础的环境振动影响和多排孔列近场隔振的边界... 详细信息

人工振动污染在国际上已被列入“七大环境公害”之一,多排孔列隔振是振动污染治理的一种方式。针对饱和地基中多排孔列近场主动隔振问题,基于饱和土半解析边界元法(BEM),分别建立了动力机器基础的环境振动影响和多排孔列近场隔振的边界元方程。为提高BEM计算效率,构建了饱和土半解析BEM的SPMD(单程序多数据)并行算法,同时利用孔列间在空间上的对应关系提出了边界元影响系数矩阵快速生成的优化算法。在此基础上,深入研究了多排孔列的近场主动隔振效果,分析了布孔方式、几何参数和多排孔距振源距离对其隔振效果的影响。结果表明:饱和土半解析BEM的SPMD并行算法结合影响系数矩阵生成的优化算法可显著提升多排孔列隔振问题的计算效率。多排孔列的布孔方式对隔振效果基本无影响;增加排孔孔数和孔径、降低孔间净距均能取得更好的隔振效果,而多排孔的排数和排间距对隔振效果影响相对不大;随着多排孔距振源距离增加,多排孔隔振效果先提高后趋于稳定。在实际工程设计时,建议多排孔排数宜为两排,排孔孔径取0.15λR(λR为Rayleigh波波长)、孔深取λR、孔间净距取0.1λR,单排孔数宜根据所需屏蔽区域的面积合理确定。

关键词：饱和地基动力机器基础地面振动多排孔 SPMD 隔振效果

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Selenate oxyanion-intercalated niFeOOH for stable water oxidation via lattice oxygen oxidation mechanism

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Journal of Energy Chemistry 2025年第2期101卷 676-684页

作者： Yijie zhang weiyi zhang Xiaow.n zhang Jinping Li Guang Liu Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization College of Chemical Engineering and Technology Taiyuan University of Technology Shanxi Research Institute of Huai Rou Laboratory

Transition metal-based compounds can serve as pre-catalysts to obtain genuine oxygen evolution reaction（OER） electrocatalysts in the form of oxyhydroxides through electrochemical ***,the role and existence form of leached oxygen anions are still ***,we selected iron selenite-wrapped hydrated nickel molybdate（denoted as niMoO/FeSeO） as a pre-catalyst to study the oxyanion *** is surprising to find that SeO2-exists in the catalyst in the form of intercalation,which is different from previous studies that suggest that anions are doped with residual elements after electrochemical activation,or adsorbed on the catalyst *** experiment and theoretical calculations show that the existence of SeO42-intercalation effectively adjusts the electronic structure of niFeOOH,promotes intramolecular electron transfer and O-O release,and thus lowers the reaction energy *** expected,the synthesized niFeOOH-SeO only needs 202 and 285 mV to attain 100 and 1000 mA cm-2in 1 M ***,the anion exchange membrane water electrolyzer（AEMwE） consisting of niFeOOHSeO anode and Pt/C cathode can reach 1 A cm-2at 1.70 V and no significant attenuation within 300 *** findings provide insights into the mechanism,by which the intercalated oxyanions enhance the OER performance of niFeOOH,thereby facilitating large-scale hydrogen production through AEMwE.

关键词： Anion exchange membrane electrolyzer Industrial current densities Lattice oxygen oxidation Oxyanion intercalation water splitting

Modulation of Bessel-like vector vortex beam using the resonant magneto-optical effect in rubidium vapor

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Chinese Physics B 2025年第2期34卷 274-280页

作者： Yan Ma Xin Yang Hong Chang Ming-Tao Cao Xiao-Fei zhang Rui-Fang Dong Shou-gang zhang Key Laboratory of Time Reference and Applications National Time Service CenterChinese Academy of Sciences(CAS)Xi’an 710600China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Ministry of Education Key Laboratory for nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic DevicesSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Department of Physics Shaanxi University of Science and TechnologyXi’an 710021China Hefei national Laboratory Hefei 230088China

The Bessel-like vector vortex beam(BlVVB)has gained increasing significance across numerous ***,its practical application is restricted by manufacturing difficulties and polarization ***,the ability to manipulate its degrees of freedom is highly *** this paper,the full-domain polarization modulation of BlVVB within a hot atomic ensemble has been *** begin with the theoretical analysis of the resonant magneto-optical effect of atoms with a horizontal linear-polarized beam and experimentally demonstrate precise manipulation of the polarization state across the entire domain of the BlVVB,achieving an error margin of less than 3°at various cross-sectional *** study provides a novel approach for the modulation of BlVVB based on atomic media,which holds potential applications in sensitive vector magnetometers,optical communications,and signal processing.

关键词： Bessel-like vector vortex beam resonant magneto-optical effect polarization modulation Rb atomic ensemble

How sediment dredging alters phosphorus dynamics in a lowland rural river?

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Journal of Environmental Sciences 2025年第1期147卷 189-199页

作者： Qimou zhang Jiacong Huang Yulai Ji Jing zhang Shuai zhang Junfeng Gao Key Laboratory of watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 10094China

China’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic ***,quantifying P dynamics in a lowland rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this *** modelwas coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynamics under the impact of dredging in a lowland rural *** on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,China,the coupled model was calibrated and achieved a model performance(R^(2)>0.59,RMSEn the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was~300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23%after dredging.(2)Dredging significantly reduced P release from sediment by 98%,while increased P resuspension and settling capacities by 16%and 46%,respectively.(3)The sediment-water interface(SwI)plays a critical role in P transfer within the river,as resuspension accounts for 16%of TP imports,and settling accounts for 47%of TP *** the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promising approaches to enhance P retention *** study provides valuable insights for local environmental departments,allow.ng a comprehensive understanding of P dynamics in lowland rural *** enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.

关键词： Lowland rural river Phosphorus Sediment dredging Model ensemble Retention capacity

A Brief Review on Mean Field Optimal Control Problem from a Linear Quadratic Perspective

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Journal of Systems Science & Complexity 2025年第01期 390-420页

作者： JIAnG Xiushan HO Daniel.w.C. zhang weihai College of new Energy China University of Petroleum (East China) Department of Mathematics City University of Hong Kong College of Electrical Engineering and Automation Shandong University of Science and Technology

This paper reviews the mean field social(MFS) optimal control problem for multi-agent dynamic systems and the mean-field-type(MFT) optimal control problem for single-agent dynamic systems within the linear quadratic(LQ) framework. For the MFS control problem, this review discusses the existing conclusions on optimization in dynamic systems affected by both additive and multiplicative noises. In exploring MFT optimization, the authors first revisit researches associated with single-player systems constrained by these dynamics. The authors then extend the proposed review to scenarios that include multiple players engaged in nash games, Stackelberg games, and cooperative Pareto games. Finally, the paper concludes by emphasizing future research on intelligent algorithms for mean field optimization, particularly using reinforcement learning method to design strategies for models with unknown parameters.

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Analyzing carbon emissions and influencing factors in Chengdu-Chongqing urban agglomeration counties

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Journal of Environmental Sciences 2025年第5期151卷 640-651页

作者： zhang Heng Lu w.nfu Peng Lindan zhang Key Laboratory of the Evaluation and Monitoring of Southwest Land Resources(Ministry of Education) Sichuan Normal UniversityChengdu 610068China The Institute of Geography and Resources Science Sichuan Normal UniversityChengdu 610068China

Majority of carbon emissions originate from fossil energy consumption,thus necessitating calculation and monitoring of carbon emissions from energy *** this study,we utilized energy consumption data from Sichuan Province and Chongqing Municipality for the years 2000 to 2019 to estimate their statistical carbon *** then employed nighttime light data to downscale and infer the spatial distribution of carbon emissions at the county level within the Chengdu-Chongqing urban ***,we analyzed the spatial pattern of carbon emissions at the county level using the coefficient of variation and spatial autocorrelation,and we used the Geographically and Temporally weighted Regression(GTwR)model to analyze the influencing factors of carbon emissions at this *** results of this study are as follows:(1)from 2000 to 2019,the overall carbon emissions in the Chengdu-Chongqing urban agglomeration showed an increasing trend followed by a decrease,with an average annual growth rate of 4.24%.However,in recent years,it has stabilized,and 2012 was the peak year for carbon emissions in the Chengdu-Chongqing urban agglomeration;(2)carbon emissions exhibited significant spatial clustering,with high-high clustering observed in the core urban areas of Chengdu and Chongqing and low-low clustering in the southern counties of the Chengdu-Chongqing urban agglomeration;(3)factors such as GDP,population(Pop),urbanization rate(Ur),and industrialization structure(Ic)all showed a significant influence on carbon emissions;(4)the spatial heterogeneity of each influencing factor was evident.

关键词： Carbon emissions Chengdu-Chongqing urban agglomeration Spatial autocorrelation Geographically and temporally weighted regression