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Countering microplastics pollution with photocatalysis: Challenge and prospects

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Progress in Natural Science:Materials International 2023年第3期33卷 251-266页

作者： Runjing Xu Lifeng Cui shifei Kang School of Environment and Architecture University of Shanghai for Science and Technology College of Smart Energy Shanghai Jiao Tong University Institute of Photochemistry and Photofunctional Materials (IPPM) University of Shanghai for Science and Technology

The rapid increase in plastic production and disposal worldwide has adversely and significantly impacted the global environment and biology. Traditional treatment methods are not appropriate for microplastics(MPs) due to their highly polymerized, stable, and complex chemical structure. Photocatalytic degradation of MPs is a relatively new and environmentally friendly approach. This review summarizes the common sources and types of MPs, and covers the various strategies and methods for degrading MPs. It describes the recent developments in the photocatalytic degradation of MPs by transition metals catalysts as well as noble metal catalysts, and discusses the characteristics and limitations of each type of catalyst. It was found out that some photo-catalysts showed very good performance for degradation of MPs, but many of the literature failed to clarify the bond-breaking mechanism during photocatalytic reaction. This review tries to elucidate the bond-breaking mechanisms of various types of MP in photocatalytic process. Advice for future research directions is proposed by investigating the knowledge gaps between those reported literature. The main purpose of this review is to provide a comprehensive summarization for the current research status of photocatalytic degradation of MPs. This work may help researchers explore new photocatalytic methods for future MP control.

关键词： Bond break mechanism Microplastics Photocatalysts Photocatalytic degradation

VIRAL DYNAMICS IN A DISTRIBUTED TIME DELAYED HCV PATHOGENESIS MODEL

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International Journal of Biomathematics 2012年第6期5卷 141-155页

作者： shifei WANG DINGYU ZOU Department of Mathematics Xi ' an jiao Tong UniversityXi'An 710049 P. R. China Department of Physics and Mathematics Changzhou University Chang'zhou 213016 P. R. China Department of Physics and MathematicsChangzhou University Chang ' zhou 213016 Department of Physics and MathematicsChangzhou University Chang ' zhou 213016 P. R. China

In this paper, we investigate global dynamics for a distributed time delayed HCV infection model. Our model admits two possible equilibria, an uninfected equilibrium and infected equilibrium depending on the basic reproduction number. By employing the method of Lyapunov functional, we prove that the uninfected equilibrium is global asymptotically stable if the basic reproduction number is less than one, it is unstable and the infected equilibrium is global asymptotically stable if the basic reproduction number is larger than one. The simulations results are in good accordance with our analytic results.

关键词：机理模型时间延迟分布式丙型肝炎 Lyapunov泛函动力学全局渐近稳定发病

2.5维自愈合C/SiC复合材料弹性性能预测

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固体力学学报 2013年第2期34卷 181-187页

作者：梁仕飞矫桂琼西北工业大学力学与土木建筑学院西安710129

通过试验研究了2.5维自愈合C/SiC复合材料(2.5D-C/SiC)的面内弹性性能.基于复合材料的细观结构,建立了2.5D-C/SiC的弹性模量预测模型.预测结果与试验值吻合较好,证明了模型及计算方法的正确性.研究发现,随着纤维束中纤维数的增大,经纱... 详细信息

通过试验研究了2.5维自愈合C/SiC复合材料(2.5D-C/SiC)的面内弹性性能.基于复合材料的细观结构,建立了2.5D-C/SiC的弹性模量预测模型.预测结果与试验值吻合较好,证明了模型及计算方法的正确性.研究发现,随着纤维束中纤维数的增大,经纱方向纤维的体积含量和拉压模量均增大,面内剪切模量几乎无变化,纬纱方向纤维的体积含量和其余模量均降低.随着经纱编织角度的增加,经纱方向纤维的体积含量和拉压模量均降低,面内剪切模量变化很小,纬纱方向纤维的体积含量和其余模量均增大.保持碳化硅与碳化硼体积分数的总和不变,随着碳化硼与碳化硅体积比的增加,弹性模量均逐渐降低,降低幅度很小.

关键词： 2 5维自愈合C SiC复合材料弹性性能纤维体积分数

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三维机织C/C-SiC复合材料弹性性能预测

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复合材料学报 2011年第1期28卷 138-142页

作者：梁仕飞矫桂琼王波西北工业大学力学与土木建筑学院西安710129

试验研究了三维机织C/C-SiC复合材料的弹性性能,基于复合材料的扫描电镜(SEM)照片,分析了材料的细观结构的特点,并提出了一系列的假设,建立了三维机织C/C-SiC复合材料的细观力学模型,利用均匀化方法预测了复合材料的弹性常数,分析了材... 详细信息

试验研究了三维机织C/C-SiC复合材料的弹性性能,基于复合材料的扫描电镜(SEM)照片,分析了材料的细观结构的特点,并提出了一系列的假设,建立了三维机织C/C-SiC复合材料的细观力学模型,利用均匀化方法预测了复合材料的弹性常数,分析了材料的弹性性能随经纱倾斜角的变化规律。结果表明:预测结果与试验结果吻合较好,表明该预测模型和方法的正确性;随着经纱倾斜角的增加,经纱方向的弹性模量降低,其它方向的弹性模量均增大,但面内剪切模量和厚度方向的弹性模量增幅很小。

关键词：三维机织C/C-SiC复合材料弹性性能预测均匀化方法

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A Lithium-Ion Battery Fractional Order State Space Model and its Time Domain System Identification

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A Lithium-Ion Battery Fractional Order State Space Model and...

FISITA 2012 World Automotive Congress--Volume 3:Future Automotive Powertrains

作者： Hongjie Wu shifei Yuan Chengliang Yin National Engineering Laboratory for Automotive Electronic Control Technology Shanghai Jiao Tong University

This paper deals with a fractional order state space model for the lithium-ion battery and its time domain system identification method.Currently the equivalent circuit models are the most popular model which was frequently used to simulate the performance of the battery.But as we know,the equivalent circuit model is based on the integer differential equations,and the accuracy is limited.And the real processes are usually of fractional order as opposed to the ideal integral order models.So here we propose a lithium-ion battery fractional order state space model,and compare it with the equivalent circuit models,to see which model fit with the experiment results best.Then the hybrid pulse power characterization（HPPC） test has been implemented in the lithium-ion battery during varied state-of-charge（SOC）.Based on the Levenberg-Marquardt algorithm,the parameters for each model have been obtained using the time-domain test data.Experimental results show that the proposed lithium-ion fractional order state space model has a better fitness than the classical equivalent circuit models.Meanwhile,five other cycles are adopt here to validate the prediction error of the two models,and final results indicate that the fractional model has better generalization ability.

关键词： Fractional order state space model Equivalent circuit model Time domain system identification HPPC test Lithium-ion modelling

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黄芫花黄酮提取物的制备及抗氧化活性研究

山西大学学报(自然科学版) 2021年第6期 1178-1185页

作者：王雯皓梁雪焦莹莹李石飞张立伟山西大学分子科学研究所化学生物学与分子工程教育部重点实验室山西大学中医药现代研究中心

从黄芫花甲醇提取液中制备获得一富含8个黄酮的黄芫花提取物。8个黄酮经NMR分析结构鉴定为:isoorientin,orientin,vitexin,isovitexin,quercetin 3-O-β-glucopyranoside,cynaroside,astragalin和luteolin-4′-O-glucoside。进一步构建了同时测定该提取物中8个黄酮含量的HPLC方法,方法学考察表明8个黄酮化合物有很好的分离效果,线性关系、稳定性、重复性较好。3批黄芫花黄酮提取物中含量测定结果显示提取物中8个黄酮化合物总含量为(55.19±0.32)%。FRAP和DPPH抗氧化测定结果显示8个黄酮合物及总黄酮提取物FRAP值为0.19μmol/mL～0.84μmol/mL,DPPH·清除率的IC值4.03μg/mL～149.56μg/mL。文章不仅揭示了黄芫花中一类重要的药效物质,更重要的是所获得的黄芫花黄酮提取物制备容易、含量稳定、抗氧化能力强,具有广泛的应用前景。

关键词：黄芫花黄酮提取物含量测定抗氧化活性提取分离

基于单向流固耦合方法的循环肿瘤细胞捕获特性仿真与分析

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医用生物力学 2021年第5期36卷 783-789页

作者：王检耀庄淳齐世霏王鸿东上海交通大学海洋工程国家重点实验室上海200240 上海交通大学海洋智能装备与系统教育部重点实验室上海200240 上海交通大学医学院附属仁济医院胃肠外科上海200240 上海交通大学生物医学工程学院上海200120

目的研究循环肿瘤细胞(circulating tumor cells,CTC)在血液中的运动过程以及Cell Collector取样针对CTC的捕获机理,揭示CTC检出数量与体内实际浓度的关系。方法基于Fluent和EDEM软件,应用单向流固耦合的两相流计算方法,建立血流动力学... 详细信息

目的研究循环肿瘤细胞(circulating tumor cells,CTC)在血液中的运动过程以及Cell Collector取样针对CTC的捕获机理,揭示CTC检出数量与体内实际浓度的关系。方法基于Fluent和EDEM软件,应用单向流固耦合的两相流计算方法,建立血流动力学模型及CTC组分运输模型,开展不同CTC浓度工况下的捕获特性仿真。结果 Cell Collector取样针的CTC捕获数量与体内CTC浓度呈明显正相关。CTC浓度较低时,只能在少数时间区间内捕获到CTC颗粒,捕获有一定的偶然性;随着浓度增加,CTC捕获数在时间上的均匀性变好,同时捕获总数也随之增加。结论通过拟合仿真结果,初步获得CTC捕获数量与体内浓度的量化解析关系,为Cell Collector的临床使用提供理论依据及力学机制阐释。

关键词：循环肿瘤细胞单向流固耦合两相流数值仿真

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