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Nano Research 2023年第1期16卷 999-1008页

作者： yixiao li Shaohua Qu Yumeng Xue lianbing Zhang li Shang School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China School of life Sciences Northwestern Polytechnical UniversityXi’an 710072China Northwestern Polytechnical University Chongqing Technology Innovation Center Chongqing 400000China

A thorough understanding of antimicrobial mechanism is of great importance for developing novel,efficient antibacterial *** cationic nanoparticles,such as metal nanoclusters(NCs),represent an attractive type of antibacterial nanoagents,their interactions with bacteria remains largely ***,we report the synthesis of cationic bovine serum albuminprotected AuAgNCs(cBSA-AuAgNCs),which exhibit both near-infrared(NIR)fluorescence properties and significant antimicrobial *** *** and *** as the representative bacteria,we investigated the antimicrobial process of cBSAAuAgNCs in real-time based on their intrinsic fluorescence properties via fluorescence *** results showed that these cBSA-AuAgNCs exert their antimicrobial effects primarily by attaching on the outer membrane of bacteria without obvious internalization,which is significantly different from the antibacterial process of negatively-charged metal *** mechanistic investigation showed that these cationic NCs will cause serious disruption to the bacterial membrane due to strong electrostatic interactions,which then leads to over accumulation of reactive oxygen species(ROS)that finally causes the bactericidal *** study demonstrates the great potential of cationic luminescent metal NCs as novel,traceable antimicrobial agents,which also provides new tools for further understanding microbial interactions of nanomedicines.

关键词： metal nanoclusters antimicrobial agents bacterial imaging near-infrared fluorescence

An abnormal carbody swaying of intercity EMU train caused by low wheel-rail equivalent conicity and damping force unloading of yaw damper

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Railway Engineering Science 2023年第3期31卷 252-268页

作者： yixiao li Maoru Chi Zhaotuan Guo Shulin liang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Low-frequency carbody swaying phenomenon often occurs to railway vehicles due to hunting instability,which seriously deteriorates the ride comfort of *** paper investigates low-frequency carbody swaying through experimental analysis and numerical *** the tests,the carbody acceleration,the wheel-rail profiles,and the dynamic characteristics of dampers were measured to understand the characteristics of the abnormal carbody vibration and to find out its primary *** and nonlinear numerical simulations on the mechanism and optimization measures were carried out to solve this carbody swaying *** results showed that the carbody swaying is the manifest of carbody hunting *** low equivalent conicity and the decrease of dynamic damping of the yaw damper are probably the cause of this *** optimization measures to increase the equivalent conicity and dynamic damping of the yaw damper were put forward and verified by on-track *** results of this study could enrich the knowledge of carbody hunting and provide a reference for solving abnormal carbody vibrations.

关键词： Low-frequency carbody swaying Intercity EMU Equivalent conicity Damping characteristics Test verification

Kinetically regulated one-pot synthesis of cationic gold nanoparticles and their size-dependent antibacterial mechanism

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Journal of Materials Science & Technology 2023年第31期162卷 145-156页

作者： Chenqiang Shen Yumeng Xue yixiao li Mengying Wei Mengyao Wen lianbing Zhang li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072China NPU-QMUL Joint Research Institute of Advanced Materials and Structures(JRI-AMAS) Northwestern Polytechnical UniversityXi’an 710072China School of life Sciences Northwestern Polytechnical UniversityXi’an 710072China

Cationic gold nanoparticles(cAuNPs)have been regarded as promising candidates for antibacterial applications due to their high surface charge density,favorable biocompatibility,and controllable surface ***,the complicated fabrication process and unclear antibacterial mechanism have greatly hindered the further biomedical application of ***,we have developed a simple and controllable strategy for synthesizing cAuNPs with tailored size and antibacterial behavior by kinetically modulating the reaction ***,a functional ligand,(11-mercaptoundecyl)-N,N,Ntrimethylammonium bromide(MUTAB),was chosen to chemically manipulate the positive surface charge of cAuNPs via a one-step *** size of cAuNPs could be flexibly adjusted from 1.1 to 14.8 nm by simply elevating the stirring speed of the reaction from 0 to 1500 *** studies revealed that the antibacterial effect of cAuNPs was strongly correlated with the particle ***-protected ultrasmall gold nanoclusters(MUTAB-AuNCs)were able to eradicate *** at a concentration as low as 1.25μg mL^(-1),while the minimum inhibitory concentration of MUTAB-AuNPs with a large size for *** was 5μg mL^(-1).Mechanistic investigation revealed that MUTAB-AuNPs were able to damage the bacterial membrane and stimulate the production of reactive oxygen species more effectively than ***,MUTAB-AuNCs were more active in inducing membrane depolarization in contrast to MUTAB-AuNPs,suggesting the unique size-dependent antibacterial manner of *** study presents a new strategy for the controlled preparation of cAuNPs with distinct sizes and antibacterial behavior,laying a valuable foundation for developing efficient cationic NP-based bactericidal agents.

关键词： Gold nanoparticles Size effect Antibacterial mechanism Reactive oxygen species Positive charge

Analysis of Geographically Anomalous 2019 Novel Coronavirus Transmission in China

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Journal of Geographic Information System 2020年第2期12卷 96-111页

作者： yixiao li Zhaoxin Dai Chinese Academy of Surveying and Mapping Beijing China Beijing No.4 High School International Campus Beijing China

Approximately in the late-December of 2019, the coronavirus disease outbreak took place in China. COVID-19 (Coronavirus Disease 2019) is contagious and detrimental to the human body, which can even lead to death. As a result, the understanding of COVID-19 has become especially important. This paper studies four cases of anomalous disease-spreading in China (Guangdong Province, Heilongjiang province, Tianjin municipality, and Guizhou province) and analyzes four influencing factors of the transmission (temperature, transportation and passenger traffic volume, household size and distribution, and awareness). Major conclusions in this paper are as follows. Transportation and passenger traffic volume and the number of larger households are positively related to the extent of disease-spreading;the degree of awareness is negatively associated with the extent of disease-spreading. Provinces, municipalities, and autonomous regions with a more urbanized distribution of households are prone to experience a greater extent of disease transmission. Although the novel coronavirus prefers colder environment, temperature appears to be a secondary influencing factor, as regions with negative temperatures have fewer diagnoses. Disease transmission in Guangdong province is caused by a high volume of passenger traffic, large and urbanized households, and low awareness. Heilongjiang province is mainly a result of high passenger traffic volume, long travelling trips, and low public awareness. Guizhou province is benefited from high awareness, limited passenger volume, and scattered households. Tianjin municipality is protected from the severe disease-spreading owe to its beneficial temperature, low land transportation volume, and high public and government awareness.

关键词： COVID-19 Disease Transmission Geographically Anomalous Cases Factor Analysis

Revealing the correlation between structure evolution and electrochemical performance of high-voltage lithium cobalt oxide

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Journal of Energy Chemistry 2021年第3期30卷 786-794页

作者： Jiajia Wan Jianping Zhu Yuxuan Xiang Guiming Zhong Xiangsi liu yixiao li Kelvin H.L.Zhang Chaoyu Hong Jianming Zheng Kai Wang Yong Yang Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory for Physical Chemistry of Solid SurfaceCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021FujianChina Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Ningde Amperex Technology Ltd Ningde 352100FujianChina School of Energy Xiamen UniversityXiamen 361005FujianChina

lithium cobalt oxide(LCO)is the dominating cathode materials for lithium-ion batteries(liBs)deployed in consumer electronic devices for its superior volumetric energy density and electrochemical *** constantly increasing demands of higher energy density urge to develop high-voltage LCO via a variety of ***,the corresponding modification mechanism,especially the influence of the long-and short-range structural transitions at high-voltage on electrochemical performance,is still not well understood and needs further *** on ss-NMR,in-situ X-ray diffraction,and electrochemical performance results,it is revealed that the H3 to H1-3 phase transition dictates the structural reversibility and stability of LCO,thereby determining the electrochemical *** introduction of La and Al ions could postpone the appearance of H1-3 phase and induce various types of local environments to alleviate the volume variation at the atomic level,leading to better reversibility of the H1-3 phase and smaller lattice strain,and significantly improved cycle *** a comprehensive long-range,local,and electronic structure characterization enables an in-depth understanding of the structural evolution of LCO,providing a guiding principle for developing high-voltage LCO for high energy density liBs.

关键词： lithium cobalt oxide High-voltage In-situ XRD Solid-state NMR Structure change

蒙自彝族尼苏、姆基和壮族土僚女性日常服饰的融合嬗变

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丝绸 2024年第6期61卷 120-128页

作者：李轶潇吴波清华大学美术学院北京100084

蒙自彝族尼苏、姆基和壮族土僚女性的日常服饰在民族交往、交流和交融中不断变迁,呈现外界难以分辨的同一化趋势。本文以田野调研为基础,结合图像资料、服饰实物、古籍文献等多维印证对三者日常着装的演变脉络和成因进行分析。研究表明... 详细信息

蒙自彝族尼苏、姆基和壮族土僚女性的日常服饰在民族交往、交流和交融中不断变迁,呈现外界难以分辨的同一化趋势。本文以田野调研为基础,结合图像资料、服饰实物、古籍文献等多维印证对三者日常着装的演变脉络和成因进行分析。研究表明:三个族群的日常服饰经历了由相异到趋同的演变过程,在共性的基础上又存在个性化的族群特征,与其地域分布、生产生活方式和风俗习惯的变迁融合等息息相关;当前,蒙自坝区的彝族尼苏女性服饰在传承创新中保存较好,山区的姆基女性服饰则依附于尼苏服饰而变化,坝区壮族的土僚女性服饰鲜有人穿着并呈现明显的“彝化”倾向。

关键词：蒙自尼苏蒙自姆基蒙自土僚女性日常服饰文化交融服饰变迁

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使用新型物态方程的超高速碰撞物质点法模拟

爆炸与冲击 2019年第10期39卷 143-149页

作者：李依潇王生捷中国航天科工集团第二研究院研究生院北京100854 北京机械设备研究所北京100854

为更准确地对超高速碰撞进行数值模拟、获得与实验结果相似度更高的碎片云形态,利用分子动力学方法求解材料的冷能、冷压,并结合Grover定标律方程,建立了一种表达形式简洁、可处理相变影响的新型物态方程,并代入自编柱坐标物质点法计算... 详细信息

为更准确地对超高速碰撞进行数值模拟、获得与实验结果相似度更高的碎片云形态,利用分子动力学方法求解材料的冷能、冷压,并结合Grover定标律方程,建立了一种表达形式简洁、可处理相变影响的新型物态方程,并代入自编柱坐标物质点法计算程序,使用新型物态方程计算所得的碎片云与使用Mie-Grüneisen、Tillotson等传统物态方程的计算结果相比,在尺寸、形态方面均能够与实验结果更好地吻合,证明了新型物态方程的有效性。

关键词：超高速碰撞物质点法物态方程分子动力学

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弹体材料在超高速碰撞过程中的物相演化

高压物理学报 2019年第6期33卷 75-83页

作者：李依潇王生捷中国航天科工集团第二研究院研究生院北京100854 北京机械设备研究所北京100854

在碰撞速度大于10 km/s的超高速碰撞问题中,弹体材料大部分发生液化、汽化,以现有技术手段对此类问题进行实验研究存在一定难度。为深入了解超高速碰撞过程中材料物相的演化规律,揭示不同密度、熔点的材料在超高速碰撞过程中的物相演化... 详细信息

在碰撞速度大于10 km/s的超高速碰撞问题中,弹体材料大部分发生液化、汽化,以现有技术手段对此类问题进行实验研究存在一定难度。为深入了解超高速碰撞过程中材料物相的演化规律,揭示不同密度、熔点的材料在超高速碰撞过程中的物相演化特征,采用物质点法,结合GRAY三相物态方程,对铜、镍、铝3种金属材料的超高速碰撞问题进行数值模拟研究,得到不同碰撞速度下弹体材料物相分布随时间变化曲线,并总结出材料特性和碰撞速度对物相演化的影响规律,为开展超高速碰撞等效实验提供参考。

关键词：超高速碰撞物质点法物相演化碰撞速度

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周代华夏族贵族阶层男性婚服类型辨析

纺织高校基础科学学报 2023年第5期36卷 62-69页

作者：李轶潇吴波清华大学美术学院北京100084

针对周代华夏族贵族阶层男性婚服类型的问题,结合相关历史文献和图绘资料,对周代华夏族上层社会的男性婚服进行了推导和梳理。结果表明:从文化背景和形成条件的角度,婚服是在周代逐步完善且在儒家思想影响之下逐渐构建而成的一种礼仪服... 详细信息

针对周代华夏族贵族阶层男性婚服类型的问题,结合相关历史文献和图绘资料,对周代华夏族上层社会的男性婚服进行了推导和梳理。结果表明:从文化背景和形成条件的角度,婚服是在周代逐步完善且在儒家思想影响之下逐渐构建而成的一种礼仪服饰文化,其形成和发展与当时的冠服制度和祭祀文化息息相关;从服饰类型的角度,周代华夏族贵族阶层的男性要依据其身份地位服用不同样式的婚服,士以上阶层亲迎时身穿冕服,头戴冕冠,足蹬赤舄,其身衣纹样和冕冠旒数随穿着者身份等级递增;而士人新婿则着爵弁服行礼,头戴爵弁,足配纁屦,其衣身并无章彩。

关键词：男性婚服华夏族爵弁服冕服足服

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仪式系统视角下二里头遗址占卜活动再研究

华夏考古 2024年第5期 128-135页

作者：张飞李怡晓中国社会科学院考古研究所北京市100710 北京大学考古文博学院北京市100871

仪式活动是早期国家礼制的重要表现形式,也是全面理解国家政治经济特征与发展历程的关键。本文通过对二里头遗址占卜遗存的空间分析,展示了占卜活动与手工业经济的密切联系。对占卜用材及占卜方式的空间分析则说明,二里头遗址内占卜活... 详细信息

仪式活动是早期国家礼制的重要表现形式,也是全面理解国家政治经济特征与发展历程的关键。本文通过对二里头遗址占卜遗存的空间分析,展示了占卜活动与手工业经济的密切联系。对占卜用材及占卜方式的空间分析则说明,二里头遗址内占卜活动具有开放性与共享性。仪式系统视角下对占卜活动与祭祀活动的对比研究,不仅揭示了不同仪式活动作为一个整体在功能属性与表现特征上具有同质性,且进一步表明仪式系统的历时性变化与重大社会变迁之间具有同步联动性。

关键词：二里头遗址占卜空间分析祭礼仪式系统