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纤维状聚苯胺/不锈钢复合电极的制备及其电化学性能研究

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化工新型材料 2024年第6期52卷 164-169页

作者：景钇淇杨禄伟王瑞娟徐卓辉裴苑娇广西农产资源化学与生物技术重点实验室玉林师范学院玉林537000

聚苯胺具有低廉的价格、简单的制备方法、良好的环境稳定性、特殊的掺杂/去掺杂特性和良好的化学稳定性等特点,是一种良好的电化学传感材料。采用循环伏安法在含苯胺的硫酸电解液中合成了不同段数的纤维状聚苯胺(PANI)/不锈钢复合电极,... 详细信息

聚苯胺具有低廉的价格、简单的制备方法、良好的环境稳定性、特殊的掺杂/去掺杂特性和良好的化学稳定性等特点,是一种良好的电化学传感材料。采用循环伏安法在含苯胺的硫酸电解液中合成了不同段数的纤维状聚苯胺(PANI)/不锈钢复合电极,通过扫描电子显微镜、X射线衍射仪和傅里叶变换红外光谱仪对材料的形貌和结构进行表征,探讨了合成条件对材料形貌和结构的影响;通过循环伏安法、恒电流充放电和差分脉冲伏安法对制备的复合电极的电化学性能和传感性能进行测试。结果表明:50段合成的PANI/不锈钢复合电极与60段合成的复合电极比电容相差不大;合成段数为50段和60段的PANI/不锈钢复合电极所构建的无酶传感器检测葡萄糖的线性范围分别为0.5~3.3mmol/L和3.9~10.5mmol/L,线性相关系数R 2分别为0.99287和0.99203,灵敏度分别为590.3μA/[(mmol·L^(-1))·cm^(2)]和157.6μA/[(mmol·L^(-1))·cm^(2)]。

关键词：聚苯胺循环伏安法电化学性能葡萄糖

Thermal Performance Analysis of PCM Capsules Packed-Bed System with Biomimetic Leaf Hierarchical Porous Structure

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Journal of Thermal Science 2021年第5期30卷 1559-1571页

作者： DONG Yan WANG Fuqiang yang luwei SHI Xuhang ZHANG Guoliang SHUAI Yong School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

As an efficient natural selection nutrient transport system,biomimetic leaf hierarchical porous structure has unique advantages in material transportation and energy *** leaf hierarchical porous structure has been widely used in solar thermochemical reactions,photocatalysis,and energy *** improve the thermal efficiency and reduce the power consumption,the authors introduce the idea of bionic leaf hierarchical porous structure packed-bed latent heat thermal energy storage(LHTES)*** the same porosity,the diameter of the PCM capsules is designed to change along the flow direction to optimize the thermal *** effects of velocity on temperature distribution,pressure drop,liquid fraction,and thermal storage capacity of the conventional uniform model and bionic leaf hierarchical porous model are *** results show that the bionic leaf hierarchical porous structure can thin the thickness of the thermocline,reduce the pressure drop,increase the heat transfer area,and improve the thermal response of the packed-bed compared with the conventional uniform *** maximum increases of liquid fraction and completion rate are 36.6%and 20.3%with pressure drop reduction of 25 Pa,*** maximum decrease of the above-melting point(MP)thermocline is 51.7%as *** results provide suggestions to optimize the packed-bed LHTES system and improve its thermal performance under practical conditions.

关键词： solar energy thermal energy storage packed bed biomimetic phase change hierarchical porous structure

Two－Phase　Critical　Discharge　of　Initially　Saturated　or　Subcooled　Water　Flowing　in　Sharp－Edged　Tubes　at　High　Pressure

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Journal of Thermal Science 1995年第3期4卷 193-199页

作者： Jinliang Xu Tingkuan Chen luwei yang Institue of Nuclear Energy Technology Tsinghua University Beijing China National Lab. on Multiphase Flow Xi’an Jiaotong University China

The transient critical flow experiment with sharp-edged tubes as the break geometries is conducted in high pressure convective circulation test loop of Xi'an Jiaotong University. The initial steady operation pressure is up to ***. An empirical correlation was made to obtain the critical mass flow rates, the critical pressure ratio and the thermal nonequilibrium number were correlated as the functions of the tube length to tube diameter ratio L/D. The predicted critical mass now rate gets a higher accuracy for short tubes with L/D 12.

关键词： critical flow thermal nonequilibrium sharp-edged tubes.

Performance analysis of a single-stage scroll compressor used in a drying heat pump over a wide condensing temperature range(30–80°C)

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Science China(Technological Sciences) 2014年第11期57卷 2131-2137页

作者： WEI Juan yang luwei ZHANG ZhenTao LIN XueJun ZHANG Chong LI Bo Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

This study presents the performance of a new single-stage scroll compressor used for the heat pump drying of thermally sensitive materials over a wide temperature range. The performance of the new compressor was predicted by an ARI standard 540 map-based compressor model and verified by a semi-open drying heat pump system constructed for this purpose. A comparison of the experimental data with the predicted data proved that the new scroll compressor used in the drying heat pump works well, can supply a wide range of condensing temperatures （30--80℃）（without auxiliary heating）, and has a minimum coeffi- cient of performance （COP） above 2.0, even in the worst condition.

关键词： drying scroll compressor performance wide temperature range

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变路径微创机器人智能化集成控制设计

中国高新科技 2024年第16期 70-71,74页

作者：王冠斌孙椰望曹安林杨鲁伟中国科学院理化技术研究所北京100190 中国科学院大学北京100190

针对高效精准微创困难的问题,文中重点采用“集成+局部功能”的自适应耦合控制系统,研制了变路径微创机器人的多电机宏微耦合并行运动和多尺度传感集成控制系统。利用上位机集成控制系统实现协作机器人系统、线控微细变路径机器人和内... 详细信息

针对高效精准微创困难的问题,文中重点采用“集成+局部功能”的自适应耦合控制系统,研制了变路径微创机器人的多电机宏微耦合并行运动和多尺度传感集成控制系统。利用上位机集成控制系统实现协作机器人系统、线控微细变路径机器人和内外视觉传感导航系统的集成智能化伺服控制。通过样机的功能实验,验证了该控制系统具有实现设计方案提出的高效变路径穿刺能力,功能满足设计要求。

关键词：线控变路径机器人智能化集成控制内外视觉

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盾构渣土制浆装备技术研究及应用

建筑机械化 2024年第6期45卷 60-63页

作者：杨露伟刘作威张宏达石富明中铁隧道局集团有限公司广东广州511400 中铁隧道局集团有限公司设备分公司广东广州511400

为解决基础建设过程中资源浪费和环境破坏问题,提出了利用盾构渣土进行制浆的技术方案。通过试验验证了这种制浆技术在不同土质条件下的性能表现,发现盾构渣土制备的同步注浆材料在强度、耐久性等方面满足设计要求。还探讨了制浆工艺流... 详细信息

为解决基础建设过程中资源浪费和环境破坏问题,提出了利用盾构渣土进行制浆的技术方案。通过试验验证了这种制浆技术在不同土质条件下的性能表现,发现盾构渣土制备的同步注浆材料在强度、耐久性等方面满足设计要求。还探讨了制浆工艺流程以及实际应用场景下的性能对比,强调了该技术在工程中的可行性和优势。总结指出,这种技术能降低成本、减少资源浪费,对环境友好,对基建行业发展和生态文明建设具有积极意义。

关键词：盾构渣土设备原状土同步制浆

Optimization of environmental maintenance system used in a refuge chamber

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International Journal of Coal Science & Technology 2015年第4期2卷 312-317页

作者： Junling yang luwei yang Chong Zhang Zhentao Zhang Xiaojiang Li Technical Institute of Physics and Chemistry of CAS Beijing 100190 China Changzhou Boruijieneng Energy and EnvironmentCorporation Changzhou 213031 China Xinjiang Coal Scientific Research Institute Urumqi 830091China

Mine refuge chambers are used to shield miners who fail to escape from the mine when incidents occur. Environment maintaining system plays a key role in stabilizing thermal environment of a mine refuge chamber against heat emitted from metabolism and transferred from outside. The safety and comfort of refugees are closely related to the environment maintaining system design. In order to improve the comfort of refugees, optimization on the environment maintaining system has been done based on the previous work. To evaluate the environment of the chamber, eight volunteers were involved into the experiment. Under close observation and safety protection, they lived in a heat-isolated test chamber for 106 hours. The volunteers were asked to maintain low level of activities to simulate refugees＇ situation. It shows that the environment maintaining system worked well and the temperature, relative humidity and emitted harmful air content such as CO2 and CO were all kept in the safety level, and no discomfort was felt by volunteers at all.

关键词： Environment maintaining system Mine refuge chamber Temperature Relative humidity CO2 concentration CO concentration

Interregional Value-Added Tax in the Era of E-Commerce: Tax Policy Design Based on Big Data from Online Retailing

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Journal of Social Computing 2024年第1期5卷 46-57页

作者： Yu Chen luwei Xiang Hu yang School of Public Finance and Taxation Central University of Finance and EconomicsBeijing 100008China School of Management and Economics The Chinese University of Hong KongShenzhen 518172China School of Information Central University of Finance and EconomicsBeijing 100008China

The value-added tax(VAT)in China is levied and allocated based on the origin *** the background of the increasing substitution of online retail for traditional offline retail,this mechanism will exacerbate the disparity of regional tax revenue,and intensify tax competition among local ***,reconsidering the allocation mechanism of value-added tax in China can be an important policy decision,and it is influenced by various economic and social ***,we utilize large-scale retail transaction data from an e-commerce platform to measure regional disparities in retail and consumption among different regions and then reveals present tax policy results in revenue imbalance in different ***,we establish a model based on game theory to illustrate how the origin principle leads to fierce tax competition among ***,by establishing and solving tax allocation models between local governments and the central government,this study simulates and calculates the degree of revenue imbalance under different scenarios and attempts to propose policy *** results indicate that implementing the destination principle will reduce regional tax ***,adjusting the allocation ratio between the central government and local governments based on city levels is advantageous for further reducing regional tax revenue disparities.

关键词： value-added tax e-commerce destination principle origin principle

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基于增材再制造的盾构扩径改造技术分析

建筑机械化 2024年第6期45卷 147-149,153页

作者：刘作威石富明张宏达李怀杨露伟中铁隧道局集团有限公司设备分公司广东广州511400 中铁隧道局集团有限公司广东广州511400

以6m管片盾构采用增材方式扩径为6.2m管片盾构为例,对盾体增材扩径再制造进行技术分析。盾体按照相关角度分布进行弧形钢板+相关筋板拼焊以实现包壳,达到扩径目的。有效地实现闲置盾构资源盘活,对发展绿色循环经济、打造制造业竞争新优... 详细信息

以6m管片盾构采用增材方式扩径为6.2m管片盾构为例,对盾体增材扩径再制造进行技术分析。盾体按照相关角度分布进行弧形钢板+相关筋板拼焊以实现包壳,达到扩径目的。有效地实现闲置盾构资源盘活,对发展绿色循环经济、打造制造业竞争新优势具有重要意义。

关键词：盾构扩径再制造包壳拼焊