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Flexible and transparent triboelectric nanogenerator based on high performance well-ordered porous PDMS dielectric film

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Nano Research 2016年第12期9卷 3714-3724页

作者： Xianming He Xiaojing Mu Quan wen Zhiyu wen jun Yang Chenguo hu Haofei Shi Department of Applied Physics Chongqing University Chongqing 400044 China Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing 400044 China Microsystem Research Center Chongqing University Chongqing 400044 China Key Laboratory of Multi-Scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China

A flexible and transparent triboelectric nanogenerator （FT-TENG） has great potential for application in self-powered biosensor systems, electronic skin and wearable electronic devices. However, improving the output performance with little damage to its optical properties is challenging. Herein, we have developed an FT-TENG that has a well-ordered nest-like porous polydimethylsiloxane （NP-PDMS） film and graphene transparent electrodes. The NP-PDMS film with ordered pores is fabricated by hydrochloric acid etching of 500 nm sized ZnO spheres made of aggregated nanoparticles, having a light transmittance of 81.8% and a water contact angle of 118.62°. The FT-TENG based on the NP-PDMS film with a porosity of 12%, gives a maximum output of 271 V and 7.8 μA, which are respectively, 3.7 and 2.1-fold of those of a TENG with a flat PDMS film. The peak output power reaches 0.39 mW with a load resistance of 9.01 MΩ. The dielectric constant and effective thickness of the NP-PDMS film and the capacitance and charge transfer of the FT-TENG are systematically investigated. This work provides a novel and effective method to enhance the performance of FT-TENGs with little damage to their optical properties.

关键词： porouspolydimethylsiloxane(PDMS) surface charge density nanogenerator flexibility transparent electrode

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基于羧甲基纤维素包裹铜纳米颗粒复合材料电化学传感器检测牛奶中诺氟沙星

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食品科学 2025年第1期46卷 184-191页

作者：李胜男胡民康秦伯扬杨文冯俊杜海军贵州民族大学化学工程学院贵州贵阳550025 贵州省农业科学院茶叶研究所贵州贵阳550006 伊犁师范大学化学化工学院新疆伊宁835000

以羧甲基纤维素(carboxymethyl cellulose,CMC)包覆的铜纳米颗粒(copper nanoparticles,Cu NPs)和碳黑(carbon black,CB)为原料,制备CMC@Cu/CB复合材料,构建检测诺氟沙星(norfloxacin,NFX)的高灵敏度电化学传感器。基于扫描电子显微镜、X射线光电子能谱和X射线衍射等手段对CMC@Cu/CB结构和形貌进行表征,在玻碳电极(glassy carbon electrode,GCE)表面滴铸复合材料悬浮液,制备CMC@Cu/CB/GCE传感器。结果表明:CMC@Cu/CB/GCE呈均匀分散球状,传感器对NFX具有良好的电流响应,线性范围为0.4~100.0μmol/L,检出限为0.24μmol/L(R_(SN)=3),此外,该修饰电极对实际样品中NFX的测定具有良好的灵敏度和稳定性,对牛奶提取物中NFX的加标回收率为98.8%~112.5%。同时,由于实验过程中原材料价格低廉,传感器的制备成本极低,在实际检测中具有良好的应用前景。

关键词：电化学传感器诺氟沙星铜纳米颗粒羧甲基纤维素

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On the Markov-dependent risk model with tax

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Applied Mathematics(A Journal of Chinese Universities) 2015年第2期30卷 187-196页

作者： PENG Xing-chun WANG wen-yuan hu Yi-jun Department of Statistics Wuhan University of Technology School of Mathematical Sciences Xiamen University School of Mathematics and Statistics Wuhan University

In this paper we consider the Markov-dependent risk model with tax payments in which the claim occurrence, the claim amount as well as the tax rate are controlled by an irreducible discrete-time Markov chain. Systems of integro-differential equations satisfied by the expected discounted tax payments and the non-ruin probability in terms of the ruin probabilities under the Markov-dependent risk model without tax are established. The analytical solutions of the systems of integro-differential equations are also obtained by the iteration method.

关键词： Compound Poisson risk model Markov-dependent risk model non-ruin probability expecteddiscounted tax payments

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On the generalized risk measures

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Applied Mathematics(A Journal of Chinese Universities) 2012年第3期27卷 281-289页

作者： ZHANG Ai-li WANG wen-yuan hu Yi-jun School of Mathematics and Statistics Nanjing Audit UniversityNanjing 211815China School of Mathematics and Statistics Wuhan UniversityWuhan 430072China

In this paper, new risk measures are introduced, tation results are also given. These newly introduced risk introduced by Song and Yan （2009） and Karoui （2009）. and the corresponding represen- measures are extens... 详细信息

关键词： risk measure distortion cash subadditivity robust representation.

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Size effect of lattice material and minimum weight design

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Acta Mechanica Sinica 2014年第2期30卷 191-197页

作者： jun Yan wen-Bo hu Zhen-hua Wang Zun-Yi Duan Dalian University of Technology

The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method（EMsFEM） in the paper. With the same volume of base material and configuration, the structural displacement and maximum axial stress of micro-rod of lattice structures with different sizes of microstructure are analyzed and *** is pointed out that different from the traditional mathematical homogenization method, EMsFEM is suitable for analyzing the structures which is constituted with lattice materials and composed of quantities of finite-sized *** minimum weight design of structures composed of lattice material is studied with downscaling calculation of EMsFEM under stress constraints of micro-rods. The optimal design results show that the weight of the structure increases with the decrease of the size of basic sub-unit cells. The paper presents a new approach for analysis and optimization of lattice materials in complex engineering constructions.

关键词： Lattice material Light weight design Size ef-fect Extented multiscale finite element method

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Large Eddy Simulation of Vertical Structure and Size Density of Deep Layer Clouds

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Advances in Atmospheric Sciences 2024年第8期41卷 1629-1642,1668-1670页

作者： Bangjun CAO Xianyu YANG jun wen Qin hu Ziyuan Zhu School of Atmospheric Sciences Chengdu University of Information TechnologyChengdu 610225China Institute for Geophysics and Meteorology University of CologneCologne 50923Germany

In a convective scheme featuring a discretized cloud size density, the assumed lateral mixing rate is inversely proportional to the exponential coefficient of plume size. This follows a typical assumption of-1, but it has unveiled inherent uncertainties, especially for deep layer clouds. Addressing this knowledge gap, we conducted comprehensive large eddy simulations and comparative analyses focused on terrestrial regions. Our investigation revealed that cloud formation adheres to the tenets of Bernoulli trials, illustrating power-law scaling that remains consistent regardless of the inherent deep layer cloud attributes existing between cloud size and the number of clouds. This scaling paradigm encompasses liquid, ice, and mixed phases in deep layer clouds. The exponent characterizing the interplay between cloud scale and number in the deep layer cloud, specifically for liquid, ice, or mixed-phase clouds, resembles that of shallow convection,but converges closely to zero. This convergence signifies a propensity for diminished cloud numbers and sizes within deep layer clouds. Notably, the infusion of abundant moisture and the release of latent heat by condensation within the lower atmospheric strata make substantial contributions. However, this role in ice phase formation is limited. The emergence of liquid and ice phases in deep layer clouds is facilitated by the latent heat and influenced by the wind shear inherent in the middle levels. These interrelationships hold potential applications in formulating parameterizations and post-processing model outcomes.

关键词： deep layer cloud cloud spatial structure cloud size density large eddy simulation

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Parameter Sensitivities of the Community Land Model at Two Alpine Sites in the Three-River Source Region

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Journal of Meteorological Research 2020年第4期34卷 851-864页

作者： Qi LUO jun wen Zeyong hu Yaqiong LU Xianyu YANG Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000 University of Chinese Academy of Sciences Beijing 100049 Chengdu University of Information Technology Chengdu 610025 Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041

The three-river source region plays an important role on China’s ecological security and Asia’s water supply. Historically, the region has experienced severe ecological degradation due to climate change and human activities. Reasonable simulations of the energy and water cycles are essential to predict the responses of land surface processes to future climate change. Current land surface models involve empirical functions that are associated with many parameters. These parameter uncertainties will largely affect the simulation when applied to a new domain. The Community Land Model(CLM) is a widely used land surface model, and version 5.0 is the newest version. Compared to the prior version CLM4.5, CLM5.0 has largely updated plant hydraulic and stomatal conductance schemes. How these changes affect parameter sensitivities is unknown. In our work, we tested 17 key parameters in CLM4.5 and 19 parameters in CLM5.0 at two eddy flux sites in the three-river source region: the Maqu and Maduo sites. We adopted the simplest one-at-a-time changes on each parameter and quantified their sensitivities by the parameter effect(PE).We found that the Maqu site was more sensitive to vegetation parameters, while the Maduo site was more sensitive to the initial soil water content in both CLM4.5 and CLM5.0. This is because Maduo grid cell has wetland that does not respond to vegetation parameters in CLM, which may not reflect the reality. Further model development on wetland vegetation parameterization is important. Our validation on the default simulation showed CLM5.0 did not always improve the simulations. The largest difference between CLM5.0 and CLM4.5 was that soil moisture(SM) showed a much stronger decrease in response to a higher leaf area index(LAI) in CLM5.0 than in CLM4.5, suggesting that SM is more sensitive to vegetation changes in CLM5.0.

关键词： parameter sensitivities Community Land Model(CLM) three-river source region

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Polymer Features in Crystallization

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Chinese Journal of Polymer Science 2022年第6期40卷 545-555页

作者： wen-Bing hu State Key Lab of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

This review firstly gives an overview on the importance of crystallization in natural and synthetic polymers/*** it introduces the typical features that have been raised by chain-like macromolecules in crystallization,including anisotropic interactions in the thermodynamic driving forces,chain folding in the crystal morphologies,chemical confinement in the copolymer crystallization,and mechanical enhancement in the stretching *** features separately cover the thermodynamics and the kinetics of polymer crystallization,as well as the crystallinity and the mechanical properties of semicrystalline *** review ends up with how these features enhance specific functions of crystalline polymers,which demonstrates polymer crystallization as a challenging yet promising field in the future.

关键词： Crystallization Macromolecules Property Function

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A New HPLC Method to Determine Carbonyl Compounds in Air

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Chinese Chemical Letters 2002年第12期13卷 1199-1202页

作者： Qing Tao PENG wen Xiang hu Xue jun HOU Institute of Military Medicine Headquarters of General EquipmentBeijing 100101

In this paper, a new HPLC method was established to determine the carbonyl compounds in air. As the absorbent, 2, 4-dinitrophenylhydrazine (2, 4-DNPH) reacted with carbonyls specifically, which form the corresponding 2,4-dinitrophenylhydrazones, then analyzed by HPLC. The chromatographic conditions, the recovery rate, stability of samples, reagent blank, sampling efficiency were all studied systematically. The results showed that this established method had high sensitivity and good selectivity compared with other analytical methods, and it can determine ten carbonyl compounds in air in 26 min simultaneously.

关键词： Carbonyl compounds HPLC 2,4-dinitrophenylhydrazine.

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Global identification of chemical constituents and rat metabolites of Si-Miao-Wan by liquid chromatography-electrospray ionization/ quadrupole time-of-flight mass spectrometry

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Chinese Journal of Natural Medicines 2017年第7期15卷 550-560页

作者： LU Jin-Jin hu Xue-wen LI Ping CHEN jun State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China

Si-Miao-Wan(SMW), a tradiational Chinese medicinal formula consisting of Atractylodis Rhizoma, Phellodendri Chinensis Cortex, Coicis Semen, and Achyranthis Bidentatae Radix, has been used for the treatment of gout and gouty arthritis for many years. In the present study, a liquid chromatography quadrupole-time-of-flight mass spectrometry(LC-Q-TOF/MS) method was established to identify the multiple constituents of SMW and its metabolites in rat biological samples after oral administration. A total of 48 compounds in SMW, including 21 alkaloids, 12 organic acids, 2 terpenes, 3 lactones, 2 phytosterols, and 8 other compounds, were tentatively characterized with the diagnostic-ion filtering strategy. Based on the diagnostic ions applied to identify compounds in SMW, 28 prototype compounds and 10 metabolic compounds were detected in the biological samples. This was the first comprehensive drug metabolism investigation of SMW in rats. The developed method could be a useful means for identifying the multi-components in SMW and the metabolic components. The results may help explore the possible metabolic processes and mechanism of action for SMW in vivo.

关键词： Si-Miao-Wan LC-Q-TOF/MS Chemical constituents Metabolites

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