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Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

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Frontiers of Mechanical Engineering 2017年第1期12卷 33-45页

作者： shaolin xu Tsunemoto KURIYAGAWA Keita SHIMADA Masayoshi MIZUTANI Division of Biomechanical Engineering Graduate School of BiomedicalEngineering Tohoku University Sendai 980-8579 Japan Department of Mechanical Systems Engineering Graduate School ofEngineering Tohoku University Sendai 980-8579 Japan

In this paper, the state of art of ultrasonic- assisted machining technologies used for fabrication of micro/nano-textured surfaces is reviewed. Diamond machining is the most widely used method in industry for manufacturing precision parts. For fabrication of fine structures on surfaces, conventional diamond machining methods are competitive by considering the precision of structures, but have limitations at machinable structures and machining efficiency, which have been proved to be partly solved by the integration of ultrasonic vibration motion. In this paper, existing ultrasonic-assisted machin- ing methods for fabricating fine surface structures are reviewed and classified, and a rotary ultrasonic texturing （RUT） technology is mainly introduced by presenting the construction of vibration spindles, the texturing principles, and the applications of textured surfaces. Some new ideas and experimental results are presented. Finally, the challenges in using the RUT method to fabricate micro/ nano-textured surfaces are discussed with respect to texturing strategies, machinable structures, and tool wear.

关键词： ultrasonic-assisted machining textured sur-face micro/nano-structures functional performance

Laser-induced microjet-assisted ablation for high-quality microfabrication

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International Journal of Extreme Manufacturing 2022年第3期4卷 122-130页

作者： Yang Guo Pei Qiu shaolin xu Gary J Cheng School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906United States of America

Liquid-assisted laser ablation has the advantage of relieving thermal effects of common laser ablation processes, whereas the light scattering and shielding effects by laser-induced cavitation bubbles, suspended debris, and turbulent liquid flow generally deteriorate laser beam transmission stability, leading to low energy efficiency and poor surface quality. Here, we report that a continuous and directional high-speed microjet will form in the laser ablation zone if laser-induced primary cavitation bubbles asymmetrically collapse sequentially near the air-liquid interface under a critical thin liquid layer. The laser-induced microjet can instantaneously and directionally remove secondary bubbles and ablation debris around the laser ablation region, and thus a very stable material removal process can be obtained. The shadowgraphs of high-speed camera reveal that the average speed of laser-induced continuous microjet can be as high as 1.1 m sin its initial 500 μm displacement. The coupling effect of laser ablation, mechanical impact along with the collapse of cavitation bubbles and flushing of high-speed microjet helps achieve a high material removal rate and significantly improved surface quality. We name this uncovered liquid-assisted laser ablation process as laser-induced microjet-assisted ablation(LIMJAA) based on its unique characteristics. High-quality microgrooves with a large depth-to-width ratio of 5.2 are obtained by LIMJAA with a single-pass laser scanning process in our experiments. LIMJAA is capable of machining various types of difficult-to-process materials with high-quality arrays of micro-channels, square and circle microscale through-holes. The results and disclosed mechanisms in our work provide a deep understanding of the role of laser-induced microjet in improving the processing quality of liquid-assisted laser micromachining.

关键词： liquid-assisted laser ablation laser-induced microjet cavitation bubbles laser microfabrication

Laser-Constructing 3D Copper Current Collector with Crystalline Orientation Selectivity for Stable Lithium Metal Batteries

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Energy & Environmental Materials 2024年第6期7卷 129-139页

作者： Hui Li Gang Wang Jin Hu Jun Li Jiaxu Huang shaolin xu Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518000China

The practical application of lithium(Li)metal anodes in high-capacity batteries is impeded by the formation of hazardous Li *** address this challenge,this research presents a novel methodology that combines laser ablation and heat treatment to precisely induce controlled grain growth within laser-structured grooves on copper(Cu)current ***,this approach enhances the prevalence of Cu(100)facets within the grooves,effectively lowering the overpotential for Li nucleation and promoting preferential Li *** approaches that modify the entire surface of collectors,our work focuses on selectively enhancing lithiophilicity within the grooves to mitigate the formation of Li dendrites and exhibit exceptional performance *** half-cell with these collectors maintains a remarkable Coulombic efficiency of 97.42%over 350 cycles at 1 mA cm^(−2).The symmetric cell can cycle stably for 1600 h at 0.5 mA cm^(−2).Furthermore,when integrated with LiFePO4 cathodes,the full-cell configuration demonstrates outstanding capacity retention of 92.39%after 400 cycles at a 1C discharge *** study introduces a novel technique for fabricating selective lithiophilic three-dimensional(3D)Cu current collectors,thereby enhancing the performance of Li metal *** insights gained from this approach hold promise for enhancing the performance of all laser-processed 3D Cu current collectors by enabling precise lithiophilic modifications within complex structures.

关键词： copper current collector heat treatment laser processing lithium metal battery selective crystalline orientation

The Hospital Outpatient Process Mining Algorithm based on Improved Chaos Genetic Algorithm

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The Hospital Outpatient Process Mining Algorithm based on Im...

广东流溪河水库盔型溞(Daphnia galeata)休眠种群与现生种群的单倍型多样性和遗传分化

第32届中国控制与决策会议

作者： Zhanguo Chai Lichao Ding shaolin xu Northern Theater Command General Hospital Noncommissioned Officer Academy Army Artillery and Air Defense Forces Academy

A process mining algorithm based on improved chaos genetic algorithm is proposed by optimizing the outpatient treatment process and combining information technology with management *** randomness and ergodicity of chaos are used to make up for the slow evolution speed and poor gene diversity of genetic *** algorithm can make full use of the log data resources generated by the medical information system to mine out the optimized *** efficiency of hospital operation is *** correctness and validity of the proposed method are verified by the process of outpatient and the corresponding data of the hospital information system.

关键词： process mining medical data treatment procedures chaos genetic algorithm

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湖泊科学 2017年第5期29卷 1209-1216页

作者：黄琦徐少林徐磊韩博平暨南大学生态学系广州510632

休眠卵库作为淡水枝角类生物与遗传信息的储藏库,从沉积物休眠卵库中萌发的枝角类对现生种群的数量与种群遗传结构有着直接的影响.分别采集流溪河水库盔型溞的现生种群和沉积物表层(0~10 cm)的休眠卵,扩增现生种群与休眠卵的线粒体细胞... 详细信息

休眠卵库作为淡水枝角类生物与遗传信息的储藏库,从沉积物休眠卵库中萌发的枝角类对现生种群的数量与种群遗传结构有着直接的影响.分别采集流溪河水库盔型溞的现生种群和沉积物表层(0~10 cm)的休眠卵,扩增现生种群与休眠卵的线粒体细胞色素C氧化酶亚基I基因,构建了单倍型网络.休眠种群相比现生种群有着较高的单倍型多样性和核酸多样性,初期现生种群分别为0.562、0.00104,末期现生种群分别为0.726、0.00331,休眠种群分别为0.815、0.00761.流溪河盔型溞现生种群与休眠种群存在双向基因流,现生种群到休眠种群的有效迁移率为490.9,休眠种群到现生种群的有效迁移率为527.5.通过构建贝叶斯系统树验证了休眠种群和现有种群中并不存在隐种或者亚种的分化,休眠种群与现生种群之间没有出现较大的遗传分化,现生种群遗传多样性来自于休眠种群,水库的休眠种群更能反映种群真实的遗传多样性.休眠种群与现生种群之间的基因流与休眠卵库大小无关,与休眠卵的萌发有关.

关键词：流溪河水库休眠卵库线粒体细胞色素C氧化酶亚基I基因基因流盔型溞

Pulse Doppler Radar based on Micro Variation Chaos Genetic Algorithm

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Pulse Doppler Radar based on Micro Variation Chaos Genetic A...

Optically anisotropic,electrically tunable microlens arrays formed via single-step photopolymerization-induced phase separation in polymer/liquid-crystal composite materials

第30届中国控制与决策会议

作者： Tang Jiansheng Pan Wei Sun Jian xu shaolin Noncommissioned Officer Academy Army Artillery and Air Defense Forces Academy

The micro variation chaos genetic algorithm designed as a general optimization method was applied to the ambiguity resolution of pulse Doppler（PD） *** fitness,based on squared error for multi-PRF（pulse repeat frequency） consecutive ordered ranges,was *** crossover operator and the conditions of ending in GA were *** relations among the probability of ambiguity resolution of this algorithm,the measurement error and the computational efficiency were *** results show the ambiguity resolution algorithm does better than the sliding window algorithm on the probability of ambiguity resolution.

关键词： micro variation chaos genetic algorithm PD radar ambiguity resolution sliding window clustering

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Light(Advanced Manufacturing) 2023年第4期4卷 21-33页

作者： Wenfeng Cai Delai Kong Zongjun Ma Mengjia Cen Jiawei Wang Dandan Yuan Ke Li Ming Cheng shaolin xu Dan Luo Yanqing Lu Yanjun Liu Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Engineering Research Center for High Resolution Light Field Display and Technology Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210093China

Microlenses or arrays are key elements in many ***,their construction methods involve multiple fabrication processes,thereby increasing the complexity and cost of *** this study,we demonstrate an optically anisotropic,electrically tunable liquid crystal(LC)microlens array using a simple,one-step fabrication *** microlens array is formed via photopolymerization-induced phase separation inside a polymer/LC *** possesses both polarization-dependent and electrically tunable focusing and imaging *** applying voltage,the microlens array has a natural focal length of 8 mm,which is a result of its inherent gradient refractive index *** applying voltage above the threshold,the LC molecules reorient along the electric field direction and the focal length of the microlens array gradually *** on its superior properties,the microlens array is further used for integral imaging applications,demonstrating electrically tunable central depth *** LC microlens arrays could find numerous potential applications owing to their advantageous features of being flat,ultra-thin,and tunable,including 3D displays,optical interconnects,and more.

关键词： Photopolymerization Phase separation Microlens array Electro-optical properties Integral imaging

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金刚石砂轮磨粒微观出刃形貌的研究进展

金刚石与磨料磨具工程 2010年第3期30卷 36-40页

作者：徐少林段隆臣岩土钻掘与防护教育部工程研究中心武汉430074 中国地质大学工程学院武汉430074

本文从表征参数和检测方法两个方面,对金刚石砂轮磨粒微观出刃形貌的研究现状进行了综述,分析了各种检测方法的基本原理和优缺点,探讨了当前金刚石砂轮磨粒微观出刃形貌研究工作中存在的问题,并对以后的研究工作提出了建议和展望。

关键词：金刚石砂轮微出刃形貌表征参数检测方法

激光诱导薄膜材料二维图案化纳米加工技术(特邀)

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光子学报 2023年第7期52卷 13-20页

作者：黄佳旭李峻邱佩徐少林南方科技大学机械与能源工程系深圳518055

激光诱导周期性表面结构(Laser-Induced Periodic Surface Structures,LIPSS)是一种在激光辐照下自发生成的超衍射极限结构,但其结构类型较为单一。提出了一种新型的二维图案化激光纳米加工方法,通过同时利用激光诱导的热效应及表面等... 详细信息

激光诱导周期性表面结构(Laser-Induced Periodic Surface Structures,LIPSS)是一种在激光辐照下自发生成的超衍射极限结构,但其结构类型较为单一。提出了一种新型的二维图案化激光纳米加工方法,通过同时利用激光诱导的热效应及表面等离激元干涉,在正交的两个方向上分别形成褶皱和LIPSS两种周期性结构。这种方法仅通过单步辐照就能在薄膜材料表面生成二维褶皱LIPSS,从而丰富LIPSS的结构类型。同时,通过调整加工材料的膜厚或基底,以及改变入射激光波长或角度,可以分别调制二维纳米结构在两个正交方向上的周期。此外,通过激光偏振也可以调控该结构的取向。该方法能够进一步拓宽基于LIPSS的可加工表面纳米结构的种类及应用。

关键词：超快激光激光诱导周期性表面结构激光诱导褶皱薄膜材料二维纳米结构飞秒激光