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Experiment and modelling of texture and sliding direction dependence on finger friction behavior

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Friction 2024年第9期12卷 1955-1968页

作者： Yuanzhe LI xue zhou Pengpeng BAI Zhonghuan XIANG Yonggang MENG Liran MA Yu TIAN State Key Laboratory of Tribology in Advanced Equipment School of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Humans rely on their fingers to sense and interact with external *** the tribological behavior between finger skin and object surface is crucial for various fields,including tactile perception,product appearance design,and electronic skin *** describing finger frictional behavior is always challenging,given the complex structure of the *** this study,the texture and sliding direction dependence of finger skin friction was quantified based on explicit mathematic *** proposed double-layer model of finger skin effectively described the nonlinear elastic response of skin and predicted the scaling-law of effective elastic modulus with contact ***,the skin friction model on textured surface considering adhesion and deformation factors was *** revealed that adhesive term dominated finger friction behavior in daily life,and suggested that object texture size mainly influenced friction-induced vibrations rather than the average friction *** with digital image correlation(DIC)technique,the effect of sliding direction on finger friction was *** was found that the anisotropy in finger friction was governed by the finger’s ratchet pawl structure,which also contributes to enhanced stick-slip vibrations in the distal sliding *** proposed friction models can offer valuable insights into the underlying mechanism of skin friction under various operating conditions,and can provide quantitative guidance for effectively encoding friction into haptics.

关键词： finger friction tactile perception tribological model textured surface sliding direction

Manipulating d-d orbital hybridization induced by Mo-doped Co_(9)S_(8) nanorod arrays for high-efficiency water electrolysis

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Journal of Energy Chemistry 2024年第6期93卷 592-600,I0015页

作者： xue zhou Jing Li Guangyao zhou Weiran Huang Yucan Zhang Jun Yang Huan Pang Mingyi Zhang Dongmei Sun Yawen Tang Lin Xu Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina 'College of Science Jinling Institute of TechnologyNanjing 211169JiangsuChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Nanjing IPE Institute of Green Manufacturing Industry Nanjing 211100JiangsuChina School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009JiangsuChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina

Precisely refining the electronic structure of electrocatalysts represents a powerful approach to further optimize the electrocatalytic ***,we demonstrate an ingenious d-d orbital hybridization concept to construct Mo-doped Co_(9)S_(8) nanorod arrays aligned on carbon cloth(CC)substrate(abbreviated as Mo-Co_(9)S_(8)@CC hereafter)as a high-efficiency bifunctional electrocatalyst toward water *** has experimentally and theoretically validated that the 4d-3d orbital coupling between Mo dopant and Co site can effectively optimize the H_(2)O activation energy and lower H^(*)adsorption energy barrier,thereby leading to enhanced hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)*** to the unique electronic and geometrical advantages,the optimized Mo-Co_(9)S_(8)@CC with appropriate Mo content exhibits outstanding bifunctional performance in alkaline solution,with the overpotentials of 75 and 234 mV for the delivery of a current density of 10 mA cm^(-2),small Tafel slopes of 53.8 and 39.9 mV dec~(-1)and long-term stabilities for at least 32 and 30 h for HER and OER,*** impressively,a water splitting electrolylzer assembled by the self-supported Mo-Co_(9)S_(8)@CC electrode requires a low cell voltage of 1.53 V at 10 mA cm^(-2)and shows excellent stability and splendid reversibility,demonstrating a huge potential for affordable and scalable electrochemical H_(2) *** innovational orbital hybridization strategy for electronic regulation herein provides an inspirable avenue for developing progressive electrocatalysts toward new energy systems.

关键词： d-d orbital hybridization Transition metal sulfides Nanorods arrays Water electrolysis

政府补助规模对技术创新的非线性影响效应——基于探索式和利用式技术创新的比较分析

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经济问题 2024年第6期 10-17,F0003页

作者：赵全厚周学腾中国财政科学研究院北京100142

进入21世纪以来,中国及世界其他主要发达国家都越来越重视采取政府补助手段来激励企业进行技术创新,但是政府补助如何影响企业的技术创新,现有文献并没有得出一致的研究结论。将技术创新划分为探索式和利用式技术创新,在成本和收益分析... 详细信息

进入21世纪以来,中国及世界其他主要发达国家都越来越重视采取政府补助手段来激励企业进行技术创新,但是政府补助如何影响企业的技术创新,现有文献并没有得出一致的研究结论。将技术创新划分为探索式和利用式技术创新,在成本和收益分析框架下比较了政府补助对两种不同类型技术创新的差异化影响效应,并运用中国上市公司的数据对所提出的假设关系进行了实证检验。研究结果表明:政府补助规模对企业探索式技术创新具有“S”型影响效应,而对利用式技术创新则具有倒“U”型影响效应。这表明政府补助对探索式技术创新有先促进、后阻碍、再促进的三阶段影响效应,而对于利用式技术创新则起着先促进、后阻碍的两段式影响效应。研究结论为制定合理的政府补助政策提供了理论借鉴。

关键词：政府补助规模探索式技术创新利用式技术创新非线性关系

Influencing Factors of Communicative Language Teaching:A Student Perspective from English Majors

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Journal of Educational Theory and Management 2024年第2期8卷 50-53页

作者： xue zhou Capital Normal University Beijing100048China

Nowadays,the Communicative Language Teaching Approach has gained significant popularity in the field of foreign language ***,there appears to be a stagnation in its application ***,this thesis aims to investigate the present state of CLT implementation and identify the factors influencing its execution within English major classrooms at Chinese universities from a student perspective.30 students responded to the questionnaire and 5 students participated in interviews to provide detailed *** analysis,it was observed that CLT has been widely used in English classes and received positive feedback from *** including the Test-oriented Educational system,teacher factors,student factors,and the Chinese traditional Confucius idea about teaching have an important impact on its ***,this article offers potential recommendations aimed at reconciling the CLT Approach with the Chinese educational context.

关键词： EFL Foreign language teaching Communicative language teaching Confucianism

Efficacy of Chinese Medicine Treatment Based on Syndrome Differentiation for Primary Insomnia:A Randomized Placebo Controlled Triple-Blinded Trial

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Chinese Journal of Integrative Medicine 2024年第10期30卷 867-876页

作者： XIONG Zhi-yi LU Ying HE Li-yun ZHANG Run-shun zhou xue-zhong LI Peng LIU Yan-jiao ZHU Jian-gui YAN Shi-yan LIU Bao-yan International Acupuncture and Moxibustion Innovation Institute School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine Department of Biomedical Data Science Stanford University School of Medicine Institute of Basic Research in Clinical Medicine China Academy of Chinese Medical Sciences Guang'anmen Hospital China Academy of Chinese Medical Sciences Beijing Jiaotong University School of Computer and Information Technology Beijing Xicheng District Community Healthcare Center China Academy of Chinese Medical Sciences

Objective: To assess efficacy of Chinese medicine(CM) on insomnia considering characteristics of treatment based on syndrome differentiation. Methods: A total of 116 participants aged 18 to 65 years with moderate and severe primary insomnia were randomized to the placebo(n=20) or the CM group(n=96) for a 4-week treatment and a 4-week follow-up. Three CM clinicians independently prescribed treatments for each patient based on syndromes differentiation. The primary outcome was change in total sleep time(TST) from baseline. Secondary endpoints included sleep onset latency(SOL), wake time after sleep onset(WASO), sleep efficiency, Pittsburgh Sleep Quality Index(PSQI) and CM symptoms. Results: The CM group had an average 0.6 h more(95% confidence interval(CI): 0.3–0.9, P<0.001) TST and 34.1%(10.3%–58.0%, P=0.005) more patients beyond 0.5 h TST increment than that of the placebo group. PSQI was changed –3.3(–3.8 to –2.7) in the CM group, a –2.0(–3.2 to –0.8, P<0.001) difference from the placebo group. The CM symptom score in the CM group decreased –2.0(–3.3 to –0.7, P=0.003) more than the placebo group. SOL and WASO changes were not significantly different between groups. The analysis of prescriptions by these clinicians revealed blood deficiency and Liver stagnation as the most common syndromes. Prescriptions for these clinicians displayed relative stability, while the herbs varied. All adverse events were mild and were not related to study treatment. Conclusions: CM treatment based on syndrome differentiation can increase TST and improve sleep quality of primary insomnia. It is effective and safe for primary insomnia. In future studies, the long-term efficacy validation and the exploratory of eutherapeutic clinicians' fixed herb formulas should be addressed.(Registration No. NCT01613183)

关键词： Chinese medicine primary insomnia randomized controlled trial syndrome differentiation

ZIF衍生的中空NiS_(2)/CoS_(2)@HNC的制备及储锂性能

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科学通报 2024年第3期69卷 464-472页

作者：周雪陈平刘莹孙晓杰大连理工大学化工学院精细化工国家重点实验室大连116024

过渡金属硫化物是石墨负极材料的优异替代品,但其导电性差、充放电过程中体积膨胀严重.针对这些问题,本文从组成和结构设计的角度出发,通过自模板法简单高效地合成中空十二面体结构的NiS_(2)/CoS_(2)@HNC复合材料.研究表明,NiS_(2)/CoS_... 详细信息

过渡金属硫化物是石墨负极材料的优异替代品,但其导电性差、充放电过程中体积膨胀严重.针对这些问题,本文从组成和结构设计的角度出发,通过自模板法简单高效地合成中空十二面体结构的NiS_(2)/CoS_(2)@HNC复合材料.研究表明,NiS_(2)/CoS_(2)@HNC复合材料用于锂电池负极时显示出良好的电化学性能,在0.2 A g^(−1)电流密度下循环100圈能达到828 mA h g^(−1)的高可逆容量,还具有优异的倍率性能.这主要得益于材料中不同成分间的协同作用以及结构优势,中空氮碳层封装NiS_(2)、CoS_(2)纳米颗粒,缩短了Li+的传输路径,增强了材料的导电性,同时很好地缓解了Li+脱嵌过程中体积膨胀造成的容量衰减.

关键词：锂离子电池负极材料过渡金属硫化物中空结构

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单分子胶束的制备及应用研究进展

化学研究与应用 2024年第1期36卷 10-27页

作者：王燕周应学西安汽车职业大学陕西西安710600 西安工程大学陕西西安710048

单分子胶束由单个分子构成且有核-壳结构的胶束,这种独特的结构,使其显示出优异的稳定性,在稀释的条件下,不会发生解离。单分子胶束因其在复杂多变的微环境中具有良好的热力学稳定性和尺寸分布均匀性,使得单分子胶束在药物运输、靶向释... 详细信息

单分子胶束由单个分子构成且有核-壳结构的胶束,这种独特的结构,使其显示出优异的稳定性,在稀释的条件下,不会发生解离。单分子胶束因其在复杂多变的微环境中具有良好的热力学稳定性和尺寸分布均匀性,使得单分子胶束在药物运输、靶向释放、染料去除、荧光标记、无机纳米颗粒模板的制备、能量收集和储存等方面都有重要应用。本文从不同聚合物结构及功能方向,综述了单分子胶束制备及应用的研究进展。

关键词：单分子胶束结构和功能制备及应用

龙山文化建筑技艺初探:以藤花落和两城镇遗址典型房址复原为例

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东南文化 2024年第1期 92-96,97-101页

作者：李俨周学鹰南京大学历史学院江苏南京210023

藤花落和两城镇遗址包含大量地面房址遗存。对比两地房址的空间体量与营建技术,可以发现藤花落房址规模呈现出明显等级差异,而两城镇房址的营造理念与技艺均领先于藤花落。从两处遗址的建筑特征考量文化类型,两城镇与尧王城遗址的房址... 详细信息

藤花落和两城镇遗址包含大量地面房址遗存。对比两地房址的空间体量与营建技术,可以发现藤花落房址规模呈现出明显等级差异,而两城镇房址的营造理念与技艺均领先于藤花落。从两处遗址的建筑特征考量文化类型,两城镇与尧王城遗址的房址高度相似,而藤花落遗址的房址特征无法证明其属于尧王城类型。

关键词：藤花落遗址两城镇遗址龙山文化建筑考古考古学建筑史学

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基于混合动态模型的居民收入分布的演变研究

数理统计与管理 2024年第4期43卷 684-704页

作者：周雪娇张宝学李群山东财经大学统计与数学学院山东济南250014 首都经济贸易大学统计学院北京100070

自改革开放后随着时间的推移,居民收入分布的位置及形状随之呈现多元化发展趋势,收入分布格局经历了深刻曲折的变迁过程。对收入分布的收敛情况和演变历程的研究多数基于静态的分析视角,或用非参数核密度探究某时间段内分布形式的动态... 详细信息

自改革开放后随着时间的推移,居民收入分布的位置及形状随之呈现多元化发展趋势,收入分布格局经历了深刻曲折的变迁过程。对收入分布的收敛情况和演变历程的研究多数基于静态的分析视角,或用非参数核密度探究某时间段内分布形式的动态趋势。本文选用1989-2015年CHNS中居民收入数据从动态视角拟合混合收入分布及其演变趋势,认识到收入分布不断右移且离散程度在持续恶化及其客观存在的事实性,目的是探究两分量混合分布函数随着时间变化的动态演变路径及估算衡量收入差距的基尼系数,研究发现收入分布呈现两阶段的发展趋势,即1989-2006年,2009-2015年。结果表明,随着时间的推移,居民收入水平和收入差距呈逐年递增且存在显著地阶段性发展态势,从动态视角更详细的反映出收入分布的演变过程。

关键词：混合动态模型收入分布演变过程基尼系数