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Unlocking the secrets behind liquid superlubricity:A state-ofthe-art review on phenomena and mechanisms

Friction 2022年第8期10卷 1137-1165页

作者： tianyi han Shuowen ZhanG Chenhui ZhanG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Superlubricity,the state of ultralow friction between two sliding surfaces,has become a frontier subject in ***,a state-of-the-art review of the phenomena and mechanisms of liquid superlubricity are presented based on our ten-year research,to unlock the secrets behind liquid superlubricity,a major approach to achieve *** overview of the discovery of liquid superlubricity materials is presented from five different categories,including water and acid-based solutions,hydrated materials,ionic liquids(ILs),two-dimensional(2D)materials as lubricant additives,and oil-based lubricants,to show the hydrodynamic and hydration contributions to liquid *** review also discusses four methods to further expand superlubricity by solving the challenge of lubricants that have a high load-carrying capacity with a low shear resistance,including enhancing the hydration contribution by strengthening the hydration strength of lubricants,designing friction surfaces with higher negative surface charge densities,simultaneously combining hydration and hydrodynamic contribution,and using 2D materials(e.g.,graphene and black phosphorus)to separate the contact of ***,uniform mechanisms of liquid superlubricity have been summarized for different liquid lubricants at the boundary,mixed,and hydrodynamic lubrication *** the best of our knowledge,almost all the immense progresses of the exciting topic,superlubricity,since the first theoretical prediction in the early 1990s,focus on uniform superlubricity *** review aims to guide the research direction of liquid superlubricity in the future and to further expand liquid superlubricity,whether in a theoretical research or engineering applications,ultimately enabling a sustainable state of ultra-low friction and ultra-low wear as well as transformative improvements in the efficiency of mechanical systems and human bodies.

关键词： liquid superlubricity hydrodynamic lubrication hydration lubrication surface potential surface forces

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Size effects in the uniaxial compressive properties of 3D printed models of rocks:an experimental investigation

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International Journal of Coal Science & Technology 2022年第6期9卷 1-12页

作者： Hao Wu Yang Ju Xin han Zhangyu Ren Yue Sun Yanlong Zhang tianyi han School of Mechanics&Civil Engineering China University of Mining&Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&Technology(Beijing)Beijing 100083China School of Emergency Management and Safety Engineering China University of Mining&Technology(Beijing)Beijing 100083China

Transparent physical models of real rocks fabricated using three-dimensional(3D)printing technology are used in photoelas-tic experiments to quantify the evolution of the internal stress and deformation fields of ***,they are rendered as an emerging powerful technique to quantitatively reveal the intrinsic mechanisms of rock *** mechanical behav-ior of natural rocks exhibits a significant size effect;however,limited research has been conducted on whether transparent physical models observe similar size *** this study,to make the transparent printed models accurately demonstrate the mechanical behavior of natural rocks and reveal the internal mechanism of the size effect in rock mechanical behavior,the size effect in 3D printed models of fractured and porous rocks under uniaxial compressive loading was *** cylindrical models with different sizes that contained different fractured and porous structures were printed using the fracture and porous characteristics extracted from natural coal and *** variation in uniaxial compres-sive strength and elastic modulus of fractured and porous models for increasing model sizes were obtained through uniaxial compression ***,the influence of internal discontinuous structural features,such as fractures and pores,on the size effect pertaining to the mechanical behavior of the model was analyzed and elaborated by comparing it with the mechanical properties of the continuous homogeneous model without fractures and *** findings provided support and reference to analyze the size effect of rock mechanical behavior and the effect of the internal discontinuous structure using 3D printed transparent models.

关键词： Size effect 3D printed model Rocks Mechanical property Fractures Pores

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Radio-frequency measurement in semiconductor quantum computation

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Science China(Physics,Mechanics & Astronomy) 2017年第5期60卷 36-48页

作者： tianyi han MingBo Chen Gang Cao HaiOu Li Ming Xiao GuoPing Guo Key Laboratory of Quantum Information Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Semiconductor quantum dots have attracted wide interest for the potential realization of quantum computation. To realize efficient quantum computation, fast manipulation and the corresponding readout are necessary. In the past few decades, considerable progress of quantum manipulation has been achieved experimentally. To meet the requirements of high-speed readout, radio-frequency （RF） measurement has been developed in recent years, such as RF-QPC （radio-frequency quantum point contact） and RF-DGS （radio-frequency dispersive gate sensor）. Here we specifically demonstrate the principle of the radio-frequency reflectometry, then review the development and applications of RF measurement, which provides a feasible way to achieve high-bandwidth readout in quantum coherent control and also enriches the methods to study these artificial mesoscopic quantum systems. Finally, we prospect the future usage of radio-frequency reflectometry in scaling-up of the quantum computing models.

关键词： quantum dot radio-frequency reflectometry RF-QPC RF-DGS

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Refined microstructure and enhanced mechanical properties of AlCrFe_(2)Ni_(2) medium entropy alloy produced via laser remelting

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Journal of Materials Science & Technology 2022年第4期99卷 18-27页

作者： tianyi han Yong Liu Mingqing Liao Danni Yang Nan Qu Zhonghong Lai Jingchuan Zhu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Center of Analysis and Measurement and Computing Harbin Institute of TechnologyHarbin 150001China

A Co-free as-cast AlCrAlCrFe_(2)Ni_(2)medium entropy alloy(MEA)with multi-phases was remelted by fiber laser in this *** effect of laser remelting on the microstructure,phase distribution and mechanical properties was investigated by characterizing the as-cast and the remelted AlCrAlCrFe_(2)Ni_(2)*** laser remelting process resulted in a significant decrease of grain size from about 780μm to 58.89μm(longitudinal section)and 15.87μm(transverse section)and an increase of hardness from 4.72±0.293 GPa to 6.40±0.147 GPa(longitudinal section)and 7.55±0.360 GPa(transverse section).It was also found that the long side plate-like microstructure composed of FCC phase,ordered B2 phase and disordered BCC phase in the as-cast alloy was transformed into nano-size weave-like microstructure consisting of alternating ordered B2 and disordered BCC *** mechanical properties were evaluated by the derived stressstrain relationship obtained from nano-indentation tests *** results showed that the yield stress increased from 661.9 MPa to 1347.6 MPa(longitudinal section)and 1647.2 MPa(transverse section)after *** individual contribution of four potential strengthening mechanisms to the yield strength of the remelted alloy was quantitatively evaluated,including grain boundary strengthening,dislocation strengthening,solid solution strengthening and precipitation *** calculation results indicated that dislocation and precipitation are dominant strengthening mechanisms in the laser remelted MEA.

关键词： Medium entropy alloy Laser remelting Microstructure Nano-indentation Strengthening mechanism

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Rational Design ofAg Nanocubes-Reduced Graphene Oxide Nanocomposites for High-performance Non-enzymatic H2O2 Sensing

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Chemical Research in Chinese Universities 2017年第6期33卷 946-950页

作者： JI Ye han tianyi ZhanG Yong WANG Ziying ZhanG Tong LENG Jiyan State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changehun 130012 P. R. China First Hospital of Jilin University Changchun 130021 P. R. China

Ag nanocubes-reduced graphene oxide（AgNCs-rGO） nanocomposite was successfully prepared by an in situ synthesis method, in which AgNCs were loaded onto the surface of rGO during the formation of AgNCs in an ethylene glycol solution. Characterization by X-ray diffraction, UV-Vis spectroscopy, and scanning electron microscopy indicated the successful preparation of the AgNCs-rGO nanocomposite. Most importantly, the AgNCs-rGO nanocomposite exhibited excellent electrocatalytic activity for the reduction of H2O2, leading to a high-performance non-enzymatic H2O2 sensor with a linear detection range and detection limit of approximately 0.1 mmol/L to 70 mmol/L（r=0.999） and 0.58 μmol/L, respectively. Our present work provides a new and highly efficient method for fabricating high-performance electrochemical sensors.

关键词： H2O2 sensor Ag nanocube Reduced graphene oxide

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A hybrid method to select morphometric features using tensor completion and F-score rank for gifted children identification

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Science China(Technological Sciences) 2021年第9期64卷 1863-1871页

作者： ZhanG Jin FENG Fan han tianyi DUAN Feng SUN Zhe CAIAFA Cesar F. SOLÉ-CASALS Jordi College of Computer Science Nankai UniversityTianjin 300350China Department of Artificial Intelligence Nankai UniversityTianjin 300350China Computational Engineering Applications Unit Head Office for Information Systems and CybersecurityRIKEN351-0198 SaitamaJapan Instituto Argentino de Radioastronomía-CCT La Plata CONICET/CIC-PBA/UNLP1894 V.ElisaArgentina Department of Psychiatry University of CambridgeCambridge CB20SZUnited Kingdom Data and Signal Processing Group University of Vic-Central University of Catalonia08500 VicCataloniaSpain

Gifted children are able to learn in a more advanced way than others, probably due to neurophysiological differences in the communication efficiency in neural pathways. Topological features contribute to understanding the correlation between the brain structure and intelligence. Despite decades of neuroscience research using MRI, methods based on brain region connectivity patterns are limited by MRI artifacts, which therefore leads to revisiting MRI morphometric features, with the aim of using them to directly identify gifted children instead of using brain connectivity. However, the small, high-dimensional morphometric feature dataset with outliers makes the task of finding good classification models challenging. To this end, a hybrid method is proposed that combines tensor completion and feature selection methods to handle outliers and then select the discriminative features. The proposed method can achieve a classification accuracy of 93.1%, higher than other existing algorithms, which is thus suitable for the small MRI datasets with outliers in supervised classification scenarios.

关键词： gifted children identification morphometric features tensor completion feature selection

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协同机制下农业科研院所创新管理模式探索与实践

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中国农机化学报 2023年第10期44卷 275-280页

作者：袁朗韩天怿刘钦江苏省农业科学院南京市210014 中共江苏省委党校(江苏行政学院) 南京市210009

协同创新是科研活动的重要组织模式。农业科研院所作为我国农业科技创新和全面推进乡村振兴的主战场之一,管理模式和管理水平对农业科研院所的科技创新高质量发展起着决定性作用。系统梳理农业科研院所现阶段管理模式和发展水平,深入分... 详细信息

协同创新是科研活动的重要组织模式。农业科研院所作为我国农业科技创新和全面推进乡村振兴的主战场之一,管理模式和管理水平对农业科研院所的科技创新高质量发展起着决定性作用。系统梳理农业科研院所现阶段管理模式和发展水平,深入分析还存在的管理模式不够优化、管理职能不够健全和评价机制不够完善等问题。探索在协调创新机制的高效管理模式下,通过创新行政管理体系、打造联合攻关格局、创新成果转化体系、建立人才奖励机制和创新开发体制,不断提升农业科研院所整体科研水平,助力农业强省建设。

关键词：协同机制科研院所创新发展模式探析管理效果

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吸湿剂、表面活性剂及催化剂对烟气循环流化床脱硫的增效机制

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化工学报 2018年第9期69卷 4044-4050页

作者：韩天义姚远徐珺齐立强李锦涛滕菲华北电力大学环境科学与工程系河北保定071000

为了解决烟气循环流化床脱硫效率偏低、烟气出口二氧化硫浓度不符合超低排放要求的问题,对在脱硫剂中添加增效剂进行了实验研究,得到了吸湿剂、表面活性剂和催化剂三种试剂添加量与脱硫效率间的关系。结果表明:单独添加吸湿剂氯化镁、... 详细信息

为了解决烟气循环流化床脱硫效率偏低、烟气出口二氧化硫浓度不符合超低排放要求的问题,对在脱硫剂中添加增效剂进行了实验研究,得到了吸湿剂、表面活性剂和催化剂三种试剂添加量与脱硫效率间的关系。结果表明:单独添加吸湿剂氯化镁、表面活性剂十二烷基苯磺酸钠及催化剂已二酸的质量分数分别为1.3%、0.03%和1.2%时,脱硫效率最高分别可达97.14%、97.70%和98.45%;吸湿剂、表面活性剂和催化剂共同添加质量分数分别为1.3%、0.03%和1.2%时,脱硫效率最佳,可高达99.19%;相较于未添加增效剂时95.37%的脱硫效率,提升效果明显。添加适量的吸湿剂、表面活性剂和催化剂能够使烟气二氧化硫排放浓度符合超低排放要求,是有效提高半干法烟气循环流化床脱硫效率的方法。

关键词：烟气循环流化床超低排放脱硫效率吸湿剂表面活性剂催化剂

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燃料抛撒初始阶段的蹿火现象

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科技导报 2015年第16期33卷 61-64页

作者：杜海文韩天一西安近代化学研究所西安710065

在燃料抛撒形成燃料空气炸药的过程中,燃料可能发生点火燃烧或爆燃现象,通称为蹿火。蹿火现象的发生,极大地降低了燃料空气炸药能量的输出。解决蹿火问题,对二次引爆型云爆战斗部的研制尤为重要。针对燃料抛撒初始阶段蹿火现象,通过数... 详细信息

在燃料抛撒形成燃料空气炸药的过程中,燃料可能发生点火燃烧或爆燃现象,通称为蹿火。蹿火现象的发生,极大地降低了燃料空气炸药能量的输出。解决蹿火问题,对二次引爆型云爆战斗部的研制尤为重要。针对燃料抛撒初始阶段蹿火现象,通过数值模拟和试验,获取爆轰气体产物、燃料和空气的时空分布,分析蹿火发生的因素。结果表明,爆轰气体产物量是影响抛撒初始阶段蹿火发生的主要因素,针对液固态燃料配方,最优的比药量范围为0.95%-1.70%。

关键词：燃料抛撒蹿火

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子图增强的实时同名消歧

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中文信息学报 2024年第1期38卷 45-56页

作者：韩天翼程欣宇张帆进陈波贵州大学公共大数据国家重点实验室贵州贵阳550025 贵州大学文本计算与认知智能教育部工程研究中心贵州贵阳550025 清华大学计算机科学与技术系北京100084

实时同名消歧旨在实时、准确地将具有歧义的作者姓名的新增论文关联到同名候选作者中的正确作者。当前同名消歧算法主要解决冷启动同名消歧问题,较少探索如何高效并有效地解决实时同名消歧问题。该文提出了子图增强的实时同名消歧模型RN... 详细信息

实时同名消歧旨在实时、准确地将具有歧义的作者姓名的新增论文关联到同名候选作者中的正确作者。当前同名消歧算法主要解决冷启动同名消歧问题,较少探索如何高效并有效地解决实时同名消歧问题。该文提出了子图增强的实时同名消歧模型RND-all,该模型通过高效地融合待消歧论文与候选作者之间的结构特征来提升模型的准确率。模型根据待消歧论文的属性与同名候选作者的档案分别构建子图,使用子图结构特征提取框架来计算图相关性特征,最后,通过特征工程以及文本嵌入方法计算语义匹配特征,并利用集成学习实现语义信息与结构信息的融合。实验结果表明,融入结构信息能够有效提升实时同名消歧任务的准确性,RND-all在百万级同名消歧基准WhoIsWho测试集上效果排名第一。

关键词：实时同名消歧图神经网络结构信息集成学习

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