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Tetris-Style Stacking Process to Tailor the Orientation of Carbon Fiber Scaffolds for Efficient Heat Dissipation

Nano-Micro Letters 2023年第9期15卷 310-324页

作者： Shida Han Yuan Ji Qi Zhang Hong Wu shaoyun guo Jianhui Qiu Fengshun Zhang The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065People’s Republic of China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural University015-0055AkitaJapan Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900People’s Republic of China

As the miniaturization of electronic devices and complication of electronic packaging,there are growing demands for thermal interfacial materials with enhanced thermal conductivity and the capability to direct the heat toward heat sink for highly efficient heat dissipation.Pitch-based carbon fiber(CF)with ultrahigh axial thermal conductivity and aspect ratios exhibits great potential for developing thermally conductive composites as TIMs.However,it is still hard to fabricate composites with aligned carbon fiber in a general approach to fully utilize its excellent axial thermal conductivity in specific direction.Here,three types of CF scaffolds with different oriented structure were developed via magnetic field-assisted Tetris-style stacking and carbonization process.By regulating the magnetic field direction and initial stacking density,the self-supporting CF scaffolds with horizontally aligned(HCS),diagonally aligned and vertically aligned(VCS)fibers were constructed.After embedding the polydimethylsiloxane(PDMS),the three composites exhibited unique heat transfer properties,and the HCS/PDMS and VCS/PDMS composites presented a high thermal conductivity of 42.18 and 45.01 W m^(−1)K^(−1)in fiber alignment direction,respectively,which were about 209 and 224 times higher than that of PDMS.The excellent thermal conductivity is mainly ascribed that the oriented CF scaffolds construct effective phonon transport pathway in the matrix.In addition,fishbone-shaped CF scaffold was also produced by multiple stacking and carbonization process,and the prepared composites exhibited a controlled heat transfer path,which can allow more versatility in the design of thermal management system.

关键词： Carbon fiber Magnetic field Thermal management Thermally conductive composites

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Fabrication of wear-resistant PA6 composites with superior thermal conductivity and mechanical properties via constructing highly oriented hybrid network of SiC-packed BN platelets

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Journal of Materials Science & Technology 2023年第15期146卷 200-210页

作者： Jing Chen Jiaming Zhu Yang Pan Hong Wu shaoyun guo Jianhui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of PlasticRubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065China Jiangsu Industrial Technology Research Institute of Advanced Polymer Materials Nanjing 211899China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 composites.Results show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,respectively.It is attributed to the highly oriented hybrid network that facilitates the formation of efficient thermal conductivity pathways.Temperature monitoring results during friction confirm that high TC favors the friction heat dissipation performance.Meanwhile,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。

关键词： Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties

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温度和疲劳共同作用对溴化丁基橡胶气体阻隔性能的影响

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高分子材料科学与工程 2024年第2期40卷 134-140页

作者：张帆张力伟熊英郭少云成都理工大学商学院四川成都610059 四川大学高分子研究所四川成都610065

溴化丁基橡胶(BIIR)因其出色的气体阻隔性能成为轮胎内衬层首选材料,但轮胎使用过程中因摩擦生热产生的高温和滚动过程中的屈挠疲劳作用,其性能和使用寿命将会受到很大的影响,因此,探索温度和疲劳作用对BIIR气体阻隔性能的影响具有重要... 详细信息

溴化丁基橡胶(BIIR)因其出色的气体阻隔性能成为轮胎内衬层首选材料,但轮胎使用过程中因摩擦生热产生的高温和滚动过程中的屈挠疲劳作用,其性能和使用寿命将会受到很大的影响,因此,探索温度和疲劳作用对BIIR气体阻隔性能的影响具有重要意义。文中对比研究了温度和屈挠疲劳单因素作用以及双因素作用下,BIIR气体阻隔性能的变化情况;通过交联密度测试、动态力学热分析及透射电镜等手段,探寻了BIIR在温度和疲劳双因素作用下其分子交联网络和填料分布情况的变化。结果表明,热老化作用使BIIR交联度增加,气体阻隔性能提高;疲劳作用对其气体阻隔性能的影响也较小;但温度和疲劳共同作用下,BIIR在较高温度下形成的交联网络又经屈挠疲劳的作用,更易发生裂解,并带动填料粒子的“移动”,导致了BIIR橡胶气体阻隔性能的大幅降低。

关键词：溴化丁基橡胶热老化屈挠疲劳气体阻隔性能

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基于分布鲁棒优化的车-站-网日前能量管理与交易

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电力系统自动化 2024年第5期48卷 11-20页

作者：葛少云杜咏梅郭玥崔凯刘洪李俊锴智能电网教育部重点实验室(天津大学) 天津市300072 国网经济技术研究院有限公司北京市102209

为考虑上级电网电价、光伏出力等多重多层级不确定性对车-站-网互动博弈模型的影响,且充分体现配电网主动管理技术支撑效果,文中提出了一种基于分布鲁棒优化的车-站-网能量管理与交易方法。首先,针对主动配电网内多元主体能量管理与交... 详细信息

为考虑上级电网电价、光伏出力等多重多层级不确定性对车-站-网互动博弈模型的影响,且充分体现配电网主动管理技术支撑效果,文中提出了一种基于分布鲁棒优化的车-站-网能量管理与交易方法。首先,针对主动配电网内多元主体能量管理与交易问题,建立了配电网运营商、充电站和电动汽车的日前市场互动框架。其次,融合主动网络管理技术和网络约束,在配电网运营商与聚合了电动汽车的多个充电站之间构建了以多主体各自利益最大为目标的双层Wasserstein分布鲁棒互动博弈模型。然后,提出了结合Karush-Kuhn-Tucker条件、对偶原理和大M法的化简方法以解决多层级不确定性造成的求解难题,将双层Wasserstein分布鲁棒模型转化为单层混合整数二阶锥规划模型,并利用商业求解器YALMIP/GUROBI进行了求解。最后,通过算例仿真验证了所提模型和方法的有效性。

关键词：分布鲁棒优化能量管理与交易主动配电网互动博弈多层级不确定性

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基于人文医院建设思维打造公立医院志愿服务品牌的实践与探索

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现代医院 2024年第3期24卷 356-359页

作者：罗丽凤萧少云陆巧葱郭泳仪梁蒙娜华南理工大学附属第六医院//佛山市南海区人民医院广东佛山528200

随着社会的发展和公民意识的觉醒,医院志愿服务已成为现代医疗卫生体系中不可或缺的组成部分,对提升服务模式、提高患者就医体验、树立医院社会公益性形象等方面发挥着重要的作用。文章通过基于人文医院建设思维,结合人文医院建设的内... 详细信息

随着社会的发展和公民意识的觉醒,医院志愿服务已成为现代医疗卫生体系中不可或缺的组成部分,对提升服务模式、提高患者就医体验、树立医院社会公益性形象等方面发挥着重要的作用。文章通过基于人文医院建设思维,结合人文医院建设的内涵与目标,致力于打造医院志愿服务品牌,对志愿者管理体系、服务内容和流程等方面进行梳理总结,以期为医院志愿服务品牌建设规范化及系统化提供理论参考和指导。

关键词：医院建设人文关怀志愿服务服务品牌建设路径

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An efficient bifunctional Ni-Nb_(2)O_(5)nanocatalysts for the hydrodeoxygenation of anisole

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Chinese Journal of Chemical Engineering 2022年第9期35卷 187-197页

作者： Juan Xu Ping Zhu Islam HEl Azab Ben Bin Xu Zhanhu guo Ashraf YElnaggar Gaber AMMersal Xiangyi Liu Yunfei Zhi Zhiping Lin Hassan Algadi shaoyun Shan Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China College of Chemical Engineering Southwest Forestry UniversityKunming 650224China Yunnan Province Special Equipment Safety Inspection and Research Institute Kunming 650228China Department of Food Science and Nutrition College of ScienceTaif UniversityTaif 21944Saudi Arabia Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Lab(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Department of Chemistry College of ScienceTaif UniversityTaif 21944Saudi Arabia Taizhou University Taizhou 31800China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran 11001Saudi Arabia

The Ni-Nb_(2)O_(5)nanocatalysts have been prepared by the solgel method,and the catalytic hydrodeoxygenation(HDO)performance of anisole as model compound is studied.The results show that Nb exists as amorphous Nb_(2)O_(5)species,which can promote Ni dispersion.The addition of Nb_(2)O_(5)increases the acidity of the catalyst.However,when the content of niobium is high,there is an inactive Nb-Ni-O mixed phase.The size and morphology of Ni grains in catalysts are different due to the difference of Nb/Ni molar ratio.The Ni_(0.9)Nb_(0.1)sample has the largest surface area of 170.8 m^(2)·g^(-1)among the catalysts prepared in different Nb/Ni molar ratios,which is mainly composed of spherical nanoparticles and crack pores.The HDO of anisole follows the reaction route of the hydrogenation HYD route.The Ni_(0.9)Nb_(0.1)catalyst displayed a higher HDO performance for anisole than Ni catalyst.The selectivity to cyclohexane over the Ni_(0.9)Nb_(0.1)sample is about 10 times that of Ni catalyst at 220℃and 3 MPa H_(2).The selectivity of cyclohexane is increased with the increase of reaction temperature.The anisole is almost completely transformed into cyclohexane at 240℃,3 MPa H_(2)and 4 h.

关键词： Hydrodeoxygenation(HDO) Catalysts Ni-Nb_(2)O_(5) Solgel method Anisole

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Peptides-modified polystyrene-based polymers as high-performance substrates for the growth and propagation of human embryonic stem cells

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Chinese Chemical Letters 2022年第6期33卷 2901-2905页

作者： Fen Yang Da Zhang Quanming Zhou Mengchu Li Chengliang Xie shaoyun Li Xuan Wang Wei Wang Ying guo Qicai Xiao Yong Wang Liqian Gao School of Pharmaceutical Sciences(Shenzhen) Sun Yat-sen UniversityShenzhen 518107China Institute of Bioengineering and Bioimaging Singapore 138669Singapore

As human stem cells with the special pluripotency play important roles in the innovative drug discovery and regenerative medicine,development of extracellular matrix(ECM)mimetics or functional materials that can support stem cell growth and propagation is of high significance.Despite numerous efforts spent,one major limitation restricting the wide applications of stem cells to the clinical translation is the lack of efficient strategies for low cost and large-scale stem cell production under xeno-free culture conditions.Herein,we reported a new strategy with peptides-modified polystyrene-based polymers coated onto the surface of coverslips for the growth and reproduction of human embryonic stem cells(h ESCs).The modified peptides are the active parts of proteins which has been shown to contribute to the pluripotent stem cell attachment or proliferation.The peptides were linked to the glass coverslips coated by the polymer materials via chemical crosslinking,and the composite substrates successfully maintain the longterm growth of HUES-7,H7 and DF699.Our study shows that the coating of polystyrene-derived polymer modified by our developed peptides is a good matrix for long-term growth and reproduction of stem cells.This polystyrene-derived polymer substrate can be produced in large scale and stored for a long time.The most important thing is that it can support the growth of undifferentiated human pluripotent stem cells(h PSCs)for more than ten passages,which could provide a new and relatively easy way to amplify h ESCs in vitro.

关键词： Extracellular matrix Stem cell Peptide Coverslip Polystyrene

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An optimization strategy of controlled electric vehicle charging considering demand side response and regional wind and photovoltaic

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 232-239页

作者： Hong LIU Pingliang ZENG Jianyi guo Huiyu WU shaoyun GE Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electric Power Research Institute of China Beijing 100192China University of Wisconsin Madison MadisonWI 53706USA

Renewable energy,such as wind and photovoltaic(PV),produces intermittent and variable power output.When superimposed on the load curve,it transforms the load curve into a‘load belt’,i.e.a range.Furthermore,the large scale development of electric vehicle(EV)will also have a significant impact on power grid in general and load characteristics in particular.This paper aims to develop a controlled EV charging strategy to optimize the peak-valley difference of the grid when considering the regional wind and PV power outputs.The probabilistic model of wind and PV power outputs is developed.Based on the probabilistic model,the method of assessing the peak-valley difference of the stochastic load curve is put forward,and a two-stage peak-valley price model is built for controlled EV charging.On this basis,an optimization model is built,in which genetic algorithms are used to determine the start and end time of the valley price,as well as the peak-valley price.Finally,the effectiveness and rationality of the method are proved by the calculation result of the example.

关键词： Renewable energy Electric vehicle Controlled electric vehicle(EV)charging Demand side response Peak-valley price

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Polyamines and antioxidant defense system are associated with cold tolerance in centipedegrass

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Frontiers of Agricultural Science and Engineering 2018年第1期5卷 129-138页

作者： Jingjing CHEN Junyang FANG Zhenfei guo shaoyun LU College of Life Sciences Guangdong Engineering Research Center for Grassland Science/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural University Key Laboratory of Tropical Fruit Biology of Ministry of Agriculture/South Subtropical Crops Research Institute Chinese Academy of Tropical Agricultural Science College of Grassland Science Nanjing Agricultural University

Physiological responses to low temperature were analyzed in a chilling-tolerant centipedegrass(Eremochloa ophiuroides) accession, Shao Guan(SG), in comparison to the commercial cultivar, Common. Lower levels of ion leakage and higher chlorophyll(Chl)concentration were observed in SG than in Common during chilling stress. The maximum photochemical efficiency, the actual photosystem Ⅱ(PSII) efficiency,photochemical quenching efficiency, and net photosynthetic rate were decreased during chilling stress in both genotypes, with higher levels of these parameters shown by SG than Common. In addition, higher activities of superoxide dismutase(SOD), catalase(CAT), ascorbateperoxidase(APX) and glutathione reductase(GR), and higher concentrations of ascorbic acid(AsA) and glutathione(GSH) were observed in SG than in Common.Moreover, higher concentrations of putrescine(Put),spermidine(Spd), and spermine(Spm) were observed in SG than in Common. Correlation analysis indicated that SOD, CAT, APX and GR activities, and As A and GSH concentrations showed high correlation to Put, while APX,GR, and As A concentrations were correlated to Spd.Exogenous Put or Spd increased antioxidant enzyme activities and chilling tolerance. The results suggested that polyamine-regulated antioxidants are important for chilling tolerance in centipedegrass and protect plants against chilling induced oxidative damage.

关键词： antioxidants centipedegrass chilling photosynthesis polyamines

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干法球磨原位剥离石墨对聚苯乙烯复合材料导热和力学性能的影响

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高分子材料科学与工程 2022年第9期38卷 80-87,94页

作者：王红莲郭英健张阳吴宏郭少云高分子材料工程国家重点实验室(四川大学)四川大学高分子研究所四川省橡塑材料复合成型技术工程实验室四川成都610065

相较于传统的湿法球磨,干法球磨剥离石墨(GT)制备石墨纳米片耗时更短,且无需任何溶剂,环保低能耗。文中选用与GT具有较强界面相互作用的聚苯乙烯(PS)和氢化苯乙烯-丁二烯嵌段共聚物接枝马来酸酐(SEBS-g-MAH)为固态分散介质,原位干法球... 详细信息

相较于传统的湿法球磨,干法球磨剥离石墨(GT)制备石墨纳米片耗时更短,且无需任何溶剂,环保低能耗。文中选用与GT具有较强界面相互作用的聚苯乙烯(PS)和氢化苯乙烯-丁二烯嵌段共聚物接枝马来酸酐(SEBS-g-MAH)为固态分散介质,原位干法球磨剥离GT得到了石墨纳米片,通过密炼加工和微型注塑成型制备了PS复合材料。分析了填料在基体中的形态结构和分散状态对PS复合材料导热和力学性能的影响。实验结果表明,与未球磨GT相比,石墨纳米片与基体界面相互作用更强,分散更均匀且呈取向排列,PS复合材料的导热性能提高了27.5%、缺口冲击强度提高了14.9%。

关键词：石墨聚苯乙烯干法球磨导热力学性能

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