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Temperature and velocity dependent friction of a microscale graphite-DLC heterostructure

Friction 2020年第2期8卷 462-470页

作者： Yujie GONGYANG Wengen OUYANG Cangyu QU Michael URBAKH baogang quan Ming MA quanshui ZHENG Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Center for Nano and Micro Mechanics Tsinghua UniversityBeijing 100084China School of Chemistry and The Sackler Center for Computational Molecular and Materials Science Tel Aviv UniversityTel Aviv 69978Israel The Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv UniversityTel Aviv 69978Israel Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite *** we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon,a commercially available material with a ultra-flat *** interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than I *** an integrated approach,which includes Argon plasma irradiation of diamond-like carbon surfaces,X-ray photoelectron spectroscopy analysis and Langmuir adsorption modeling,we found that while the velocity dependence of friction follows a thermally activated sliding mechanism,its temperature dependence is due to the desorption of chemical groups upon *** observations indicate that the edges have a significant contribution to the *** results highlight potential factors affecting this type of emerging friction junctions and provide a novel approach for tuning their friction properties through ion irradiation.

关键词： friction graphite diamond like carbon irradiation desorption

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A universal route to efficient non-linear response via Thomson scattering in linear solids

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National Science Review 2023年第7期10卷 203-212页

作者： Yongzheng Wen Flavio Giorgianni Igor Ilyakov baogang quan Sergey Kovalev Chen Wang Carlo Vicario Jan-Christoph Deinert Xiaoyu Xiong Joe Bailey Min Chen Alexey Ponomaryov Nilesh Awari Andrea Rovere Jingbo Sun Roberto Morandotti Luca Razzari Gabriel Aeppli Junjie Li Ji Zhou State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Paul Scherrer Institut Helmholtz-Zentrum Dresden-Rossendorf Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Institut de Physique école Polytechnique Fédérale de Lausanne (EPFL) Institut National de la Recherche Scientifique (INRS) Centreénergie Matériaux et Télécommunications (EMT) Department of Physics and quantum Center ETH Zürich

Non-linear materials are cornerstones of modern optics and *** dependence on the intrinsic properties of particular materials,however,inhibits the at-will extension of demanding non-linear effects,especially those second-order ones,to widely adopted centrosymmetric materials(for example,silicon) and te chnologically important burgeoning spectral domains(for example,terahertz frequencies).Here we introduce a universal route to efficient non-linear responses enabled by exciting non-linear Thomson scattering,a fundamental process in electrodynamics that was known to occur only in relativistic electrons in metamaterial composed of linear *** a mechanism modulates the trajectory of charges,either intrinsically or extrinsically provided in solids,at twice the driving frequency,allowing second-harmonic generation at terahertz frequencies on crystalline silicon with extremely large non-linear susceptibility in our proof-of-concept *** offering a substantially material-and frequency-independent platform,our approach opens new possibilities in the fields of on-demand non-linear optics,terahertz sources,strong field light-solid interactions and integrated photonic circuits.

关键词： non-linear optical materials terahertz harmonic generation Thomson scattering magneto-electric coupling metamaterial

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Polarization multiplexing for double images display

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Opto-Electronic Advances 2019年第7期2卷 1-6页

作者： Jinying Guo Teng Wang baogang quan Huan Zhao Changzhi Gu Junjie Li Xinke Wang Guohai Situ Yan Zhang Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Capital Normal University Beijing Key Laboratory of Metamaterials and Devices Key Laboratory of Terahertz Optoelectronics Ministry of Education and Beijing Advanced Innovation Centre for Imaging Technology Beijing 100048 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Metasurface provides subwavelength structures for manipulating wavefronts of light. The benefits of subwavelength components offer a continuous modulation of amplitude, phase, and polarization, thus eliminating the production of higher-order images and improving the utilization of light intensity. Despite the rapid progress in this field, multiparameter control of light using single layer metasurface is rarely reported. In fact, multiparameter control of light helps to improve information storage capacity and image fidelity. With simultaneous manipulation of polarization and amplitude at each pixel, it is possible to encode two separate images into one metasurface and reconstruct them under proper conditions. In a proof of concept experiment, we demonstrate an independent display of two binary images at the same position with polarization de-multiplexing from a single metasurface. This unique technology of encoding two images through amplitude and polarization manipulation provides a new opportunity for various applications in, such as encryption, information storage, polarization holograms, optical communications and fundamental physics.

关键词： metasurface multiparameter polarization encoding

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独立分充式大豆双排毛刷高速精量排种器设计与试验

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农业机械学报 2024年第6期55卷 101-110页

作者：李玉环赵烁杨丽宋泉李宝刚杨发展青岛理工大学机械与汽车工程学院青岛266520 中国农业大学工学院北京100083

为解决机械式大豆排种器高速播种质量差的问题,设计了一种独立分充式大豆双排毛刷高速精量排种器,采用双排种盘结构增加型孔数量,独立分充避免种群积压互扰,实现高速精量排种作业。通过理论分析,明确了充种、投种性能的影响因素,并确定... 详细信息

为解决机械式大豆排种器高速播种质量差的问题,设计了一种独立分充式大豆双排毛刷高速精量排种器,采用双排种盘结构增加型孔数量,独立分充避免种群积压互扰,实现高速精量排种作业。通过理论分析,明确了充种、投种性能的影响因素,并确定了型孔与导流槽相关参数。以作业速度、型孔倾角、导流槽倾角为试验因素进行了正交试验,试验结果表明:在大豆株距为8cm、排种器作业速度为9km/h时,较优组合为型孔倾角54°、导流槽倾角39°,此时合格指数为95.5%,漏播指数为2.0%,株距变异系数为13.1%。对比试验结果表明:作业速度为8~12km/h时,独立分充式排种器合格指数比常规毛刷式排种器至少提升1.3个百分点,漏播指数至少减少0.8个百分点,株距变异系数至少减少2个百分点。窄行密植农艺适应性试验结果表明:在作业速度8~12km/h的条件下,独立分充式排种器合格指数达到90.1%,漏播指数不高于4.6%,株距变异系数不大于20.1%,窄行密植种植农艺适应性较高。

关键词：大豆精量排种器独立分充双排高速

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先驱体法制备纳米SiBON陶瓷粉体

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稀有金属材料与工程 2008年第A1期37卷 709-712页

作者：张晓东温广武全保刚黄小萧韩兆祥张宝友哈尔滨工业大学材料学院黑龙江哈尔滨150001 哈尔滨工业大学(威海) 山东威海264209 国家纳米科学中心北京100080

采用一种成本低廉、操作简便的新工艺成功制备出纳米SiBON陶瓷粉体。首先以硼酸、无水乙醇和四氯化硅为原料合成SiBO先驱体,获得具有Si-O-B结构的先驱体凝胶;然后在氨气流中对先驱体凝胶进行热分解氮化处理,即获得具有B-N结构的SiBON纳... 详细信息

采用一种成本低廉、操作简便的新工艺成功制备出纳米SiBON陶瓷粉体。首先以硼酸、无水乙醇和四氯化硅为原料合成SiBO先驱体,获得具有Si-O-B结构的先驱体凝胶;然后在氨气流中对先驱体凝胶进行热分解氮化处理,即获得具有B-N结构的SiBON纳米粉体。粉体呈现非晶态,粒径大约为30 nm。

关键词： SiBON陶瓷 SiBO先驱体热分解氮化纳米粉体

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Silicon micropillar electrodes of lithiumion batteries used for characterizing electrolyte additives

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Chinese Physics B 2021年第6期30卷 648-656页

作者：胡放荣张铭扬起文斌郑杰允孙悦康剑宇俞海龙王其钰陈世娟孙新华全保刚李俊杰顾长志李泓 Guangxi Key Laboratory of Automatic Detecting Technology and Instrument Guilin University of Electronic TechnologyGuilin 541004China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 10049China Songshan Lake Materials Laboratory DongguanChina Tianjin Jinniu Power Sources Material Co. LtdTianjin 300400China Cenertech Tianjin Chemical Research and Design Institute Co. LtdTianjin 300131China

The 100 crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the purpose of electrolyte additive identification. The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate(FEC), vinyl ethylene carbonate(VEC), ethylene sulfite(ES), and vinyl carbonate(VC) electrolyte additives in the LiPF_6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles, electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, and x-ray photoelectron spectroscopy. The results show that the silicon pillar morphology displays cross-shaped expansion after lithiation/delithiation, the inorganic lithium salt keeps the silicon pillar morphology intact, and the organic lithium salt content promotes a rougher silicon pillar surface. The presence of poly-(VC) components on the surface of FEC and VC electrodes allows the silicon pillar to accommodate greater volume expansion while remaining intact. This work provides a standard, fast, and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.

关键词： lithium-ion batteries solid electrolyte interphases electrolyte additives silicon micropillar electrodes

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空中应急通信网络中基于多属性的关键节点识别

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无线电工程 2022年第5期52卷 904-910页

作者：权治李艳冠李保罡焦利彬中国电子科技集团公司第五十四研究所河北石家庄050081 华北电力大学电子与通信工程系河北保定071003 通信网信息传输与分发技术重点实验室河北石家庄050081

基于无人机的空中应急通信网具有高空立体侦察、灵活性高、部署方便和操作简单等特点,在保障救援、紧急救助和必要通信等方面起着十分重要的作用。针对空中应急通信网非同质结构的特点,对网络中关键节点识别问题进行了研究,通过构建包... 详细信息

基于无人机的空中应急通信网具有高空立体侦察、灵活性高、部署方便和操作简单等特点,在保障救援、紧急救助和必要通信等方面起着十分重要的作用。针对空中应急通信网非同质结构的特点,对网络中关键节点识别问题进行了研究,通过构建包括节点属性和节点拓扑指标的评价体系,提出了基于多属性决策的关键节点评价算法,通过数值仿真实验验证了所提算法的有效性。

关键词：无人机应急通信关键节点多属性决策

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三角洲前缘储层非均质性及剩余油挖潜研究

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海洋石油 2015年第2期35卷 66-71,90页

作者：党胜国黄保纲王惠芝权勃郑浩中海石油(中国)有限公司天津分公司天津300452

锦州9-3油田主要含油层系为三角洲前缘相储层，多期砂体叠置，平面非均质性强，目前已进入中高含水阶段，生产矛盾突出，剩余油富集且复杂。通过研究油田小层平面分布特征、夹层分布规律、层内渗透率非均质性、层间沉积旋回的差异性和... 详细信息

锦州9-3油田主要含油层系为三角洲前缘相储层，多期砂体叠置，平面非均质性强，目前已进入中高含水阶段，生产矛盾突出，剩余油富集且复杂。通过研究油田小层平面分布特征、夹层分布规律、层内渗透率非均质性、层间沉积旋回的差异性和粒度韵律等参数，对油田主力油层三角洲前缘相储层非均质性进行综合表征。研究认为油田主力油层整体上属于强非均质性储层，造成储层强非均质性的主要因素为原始沉积环境下沉积旋回差异性和粒度韵律的差异性。结合各小层的水淹程度分析认为剩余油较富集的区域主要在Ⅰ2、Ⅰ4、Ⅱ11、Ⅱ12、Ⅱ2、Ⅲ1、Ⅲ2七个主力小层和油田的西侧、东部裙边带井控程度较低的区域。综合考虑造成剩余油分布差异的储层非均质性因素，制定了合理的总体调整方案和注采井网调整策略。

关键词：储层非均质性中高含水期小层分布夹层渗透率沉积旋回剩余油调整策略

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Effects of platelet-rich plasma on in vitro proliferation and migration of fibroblasts from human chronic refractory wound granulation tissue

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Discussion of Clinical Cases 2021年第1期8卷 24-28页

作者： Tie-ning Zhang quan Li Te Ba Tian-xi Shao Fang Li Ling-feng Wang Baotou Medical College of Inner Mongolia University of Science and Technology BaotouInner MongoliaChina Department of Burns Baogang HospitalBaotouInner MongoliaChina

Objective:To observe the effects of platelet-rich plasma(PRP)on in vitro proliferation and migration of fibroblasts from human chronic refractory wound granulation ***:Fibroblasts were separated from human chronic refractory wound granulation tissue and then were *** obtained fibroblasts were divided into fetal bovine serum(FBS)group,hydrogel group and PRP group,and the three groups were cultured with culture mediums containing FBS,hydrogel and PRP respectively,in order to observe the growth of *** wound scratch assay was used to observe the migration of ***:PRP group had more fibroblasts than FBS group and hydrogel group since Day 5 of culture,and exhibited greater fibroblast scratch migration area than FBS group on 48 h and 72 h of wound scratch assay(all p<.05).Conclusions:Compared with FBS,human fibroblasts cultured by PRP can more effectively promote the proliferation and migration of fibroblasts.

关键词： Fibroblast Chronic refractory wound Granulation tissue Platelet-rich plasma Cell proliferation Cell migration In vitro

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重轨线纹成因的研究

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包钢科技 2003年第1期29卷 17-21,29页

作者：王权包钢(集团)公司技术中心钢研院内蒙古包头014010

包钢轨梁厂生产的50kg/m、60kg/m重轨,在厂家及线路使用中发现轨头踏面存在线纹。线纹长短不等,且沿轨长度方向呈现断续分布。本文通过对线纹轨检验及现场工业试验基本上搞清了线纹产生的原因,并相应地提出了减少线纹产生的有效措施。

关键词：重轨表面线纹产生原因裂纹

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