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Strain sensor on a chip for quantifying the magnitudes of tensile stress on cells

Microsystems & Nanoengineering 2024年第3期10卷 305-315页

作者： Yuyin Zhang Yue Wang Hongze Yin Jiahao Wang Na Liu songyi zhong Long Li Quan Zhang Tao Yue School of Mechatronics Engineering and Automation Shanghai UniversityShanghaiChina School of Future Technology Shanghai UniversityShanghaiChina Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhouChina Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai UniversityShanghaiChina Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghaiChina

During cardiac development,mechanotransduction from the in vivo microenvironment modulates cardiomyocyte growth in terms of the number,area,and arrangement ***,the response of cells to different degrees of mechanical stimuli is ***-on-a-chip,as a platform for investigating mechanical stress stimuli in cellular mimicry of the in vivo microenvironment,is limited by the lack of ability to accurately quantify externally induced ***,previous technology lacks the integration of external stimuli and feedback sensors in microfluidic platforms to obtain and apply precise amounts of external ***,we designed a cell stretching platform with an in-situ *** in-situ liquid metal sensors can accurately measure the mechanical stimulation caused by the deformation of the vacuum cavity exerted on *** platform was applied to human cardiomyocytes(AC16)under cyclic strain(5%,10%,15%,20 and 25%),and we found that cyclic strain promoted cell growth induced the arrangement of cells on the membrane to gradually unify,and stabilized the cells at 15%amplitude,which was even more effective after 3 days of *** platform’s precise control and measurement of mechanical forces can be used to establish more accurate in vitro microenvironmental models for disease modeling and therapeutic research.

关键词： stress deformation arrangement

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基于循环神经网络的2-DOF软体机械臂运动建模与控制

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上海大学学报（自然科学版） 2024年第3期30卷 522-531页

作者：丁卫郑云钟宋义杨扬上海大学机电工程与自动化学院上海200444

因现有软体机械臂材料刚度小、模量不稳定,导致建模与控制难度大.提出一种基于循环神经网络(recurrentneuralnetwork,RNN)的方法,用于二自由度(two-degree-of-freedom,2-DOF)软体机械臂的运动建模与控制.使用动作捕捉仪采集不同气压、... 详细信息

因现有软体机械臂材料刚度小、模量不稳定,导致建模与控制难度大.提出一种基于循环神经网络(recurrentneuralnetwork,RNN)的方法,用于二自由度(two-degree-of-freedom,2-DOF)软体机械臂的运动建模与控制.使用动作捕捉仪采集不同气压、负载下的位置坐标,并将其导入门控循环单元(gated recurrentunit,GRU)神经网络模型进行训练.当调节超参数至网络结构最优时,测试集准确度可达98.87%.在此基础上,构建气压与负载到末端位置的映射函数.实验结果表明,本方法可将机械臂的控制精度提升至6»8 mm,显著降低了软体机器人的控制与建模难度.

关键词：循环神经网络门控循环单元模型软体机械臂建模与控制

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Influence of Interfacial Bonding between Metal Droplets on Tensile Properties of 7075 Aluminum Billets by Additive Manufacturing Technique

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Journal of Materials Science & Technology 2016年第5期32卷 485-488页

作者： Hansong Zuo Hejun Li Lehua Qi songyi zhong State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 7100721China

7075 aluminum billets were fabricated by micro droplet deposition manufacturing technique, and the influence of interracial bonding between metal droplets on the tensile properties was studied. Three sets of samples were manufactured under different temperature conditions, and their mechanical properties were compared. The results show that the temperature of the metal droplets and substrate significantly affect the tensile strength of the sample. Moreover, with proper temperature setting, the 7075 aluminum billets manufactured by micro metal droplet deposition could achieve very good mechanical properties with a tensile strength of 373 MPa and an elongation of 9.95%, which are very similar to those of an ex truded sample. Moreover, a metallurgical bonding diagram based on numerical calculations of interfacial temperature was established to predict the interfacial bonding state. In addition, the fracture morphologies of these specimens were observed. It is indicated that there was a significant transformation of failure mechanism with the improvement of metallurgical bonding, which agreed well with the numerical results.

关键词： Aluminum alloys Mechanical properties Fracture behavior Interfacial bonding Additive manufacturing

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Effect of gas pressure on ionization of ambient gas

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原子与分子物理学报 2002年第3期19卷 272-276页

作者： SONGGuang－le songyi－zhong DepartmentofPhysics LinyiTeachersUniversityLinyi276005 BiomaterialsLab DepartmentofmaterielsciencethesouthernzoneShandongUniversityJinan250061

An Nd: YAG pulsed laser (145 mJ) was used to ablate aluminum target and Ar was used as protecting gas. Time-and space-resolved spectra of the plasmas under pressure 100 Pa, 1 kPa, 10 kPa and 100 kPa were acquired with time- and space-resolved technique. The characteristics of the plasma radiating under each pressure were briefly described, and the laws of Ar characteristical radiaton were analyzed in detail. Based on the profile of Ar characteristical radiation under these pressure, the relation between protecting gas pressure and its ionization was briefly discussed, and explained with quantum theory. Farther more, the mechanism of ambient gas ionization was investigated. As the result, it was suggested that the main mechanism inducing protecting gas to ionize should be the absorption of the plasma continuum radiation by the gas.

关键词：环境气体激光烧蚀气压激光发射光谱电离过程量子理论

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基于复合油雾喷射润滑的飞机钛合金蒙皮原位钻削技术研究

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机械工程学报 2015年第15期51卷 198-204页

作者：高昆齐乐华郁大照罗俊钟宋义西北工业大学机电学院西安710172 空军第一航空学院信阳464000 海军航空工程学院烟台264001

针对传统钻孔技术难以满足新机钛合金蒙皮损伤修理要求，高能技术无法适应战伤抢修等问题，在分析复合雾滴喷射（Combined mist-jet, CMJ）润滑作用机理及其对钻削力影响的基础上，设计开发了便携式纯气动CMJ发生装置和钛合金蒙皮原位... 详细信息

针对传统钻孔技术难以满足新机钛合金蒙皮损伤修理要求，高能技术无法适应战伤抢修等问题，在分析复合雾滴喷射（Combined mist-jet, CMJ）润滑作用机理及其对钻削力影响的基础上，设计开发了便携式纯气动CMJ发生装置和钛合金蒙皮原位钻孔工具，并用其开展了无润滑干切削、最小量润滑（Minimum quantity lubrication, MQL）和CMJ润滑等三种条件下的钛合金Ti6Al4V（TC4）钻孔试验。结果表明：微量润滑是实现钛合金结构损伤原位切削润滑的有效技术途径，其中，CMJ 润滑效果更佳，在钻削2 mm厚度的TC4板材时，用油量为80～100 mL/h，用水量为200～400 mL/h时，与同等用油量的MQL润滑相比，其轴向钻削力减少24%，出口端毛刺高度降低29%，在钻头寿命内，可钻孔数提高42%；所设计的润滑装置及钻孔工具能够提高钻孔质量和抢修效率，为提升新机钛合金结构损伤外场修复及战伤抢修能力奠定了基础。

关键词：结构修理微量润滑复合雾滴喷射 TC4钛合金钻削

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基于单元生死技术的微熔滴沉积成形温度场模拟与试验研究

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稀有金属材料与工程 2013年第2期42卷 282-287页

作者：晁艳普齐乐华钟宋义罗俊杨方西北工业大学现代设计与集成制造技术教育部重点实验室陕西西安710072

采用有限单元法和单元生死技术,建立了气动按需熔滴沉积成形温度场计算模型,模拟了7075铝合金薄壁件微熔滴沉积过程温度场的演变规律。结果表明:薄壁件成形温度场随熔滴沉积位置的移动而呈现周向动态变化,不同位置熔滴单元节点的热循环... 详细信息

采用有限单元法和单元生死技术,建立了气动按需熔滴沉积成形温度场计算模型,模拟了7075铝合金薄壁件微熔滴沉积过程温度场的演变规律。结果表明:薄壁件成形温度场随熔滴沉积位置的移动而呈现周向动态变化,不同位置熔滴单元节点的热循环曲线存在不同个数的温度峰值和谷值;随着沉积层高度的增加,1～10层相邻搭接层间熔滴的冷却速率降低,熔滴所在沉积层中的高温区域逐渐扩大,使零件在成形方向上呈现变化的温度梯度,并导致1～10层相邻层间熔滴结合处的晶粒尺寸发生变化。模拟结果与7075铝合金薄壁件微熔滴沉积试验结果基本吻合,较好反映了实际成形过程中零件的温度场变化规律。

关键词：熔滴成形计算模型单元生死温度场

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基于均匀金属微滴喷射的3D打印技术

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中国科学：信息科学 2015年第2期45卷 212-223页

作者：齐乐华钟宋义罗俊西北工业大学机电学院西安710072 西北工业大学现代设计与集成制造技术教育部重点实验室西安710072

均匀金属微滴喷射技术是基于喷墨打印的原理,于20世纪90年代初提出并发展起来的一种3D打印技术.它是以均匀金属微滴为基本成型单元,依据零件形状特征逐点、逐层"堆积"而实现三维结构的快速打印技术,具有喷射材料范围广、无约束自由成形... 详细信息

均匀金属微滴喷射技术是基于喷墨打印的原理,于20世纪90年代初提出并发展起来的一种3D打印技术.它是以均匀金属微滴为基本成型单元,依据零件形状特征逐点、逐层"堆积"而实现三维结构的快速打印技术,具有喷射材料范围广、无约束自由成形和无需昂贵专用设备等优点,在微小复杂金属件制备、电路打印与电子封装以及结构功能一体化制造等领域具有广泛应用前景.由于金属材料具有熔点高、易氧化、粘性和表面张力大等特点,与非金属材料喷射沉积有很大差异.本文分析了金属微滴喷射方式及其机理,概述了此领域国内外研究现状,并结合笔者研究实践,阐述了金属微滴喷射沉积需要解决的关键技术及实例,如微滴喷射装置开发、喷射成型参数优化等,并对该技术的重点研究方向进行了展望.

关键词：金属液滴喷射均匀微滴连续式喷射按需式喷射 3D打印

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Summer extreme precipitation patterns and synoptic-scale circulation precursors over the Tibetan Plateau

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Science China Earth Sciences 2024年第5期67卷 1625-1638页

作者： Zhiyuan DING Yao HA zhong zhong College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key Laboratory for Virtual Geographic Environment School of Geography ScienceNanjing Normal UniversityNanjing 210023China Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing 210023China

In the context of global warming,the extreme summer precipitation over the Tibetan Plateau(TP)has changed *** this study,the summer(June–August)extreme precipitation on the TP was classified into three spatial types by applying the K-means clustering method to the Third Pole Region long time-series high-resolution(1/30°)precipitation dataset(TPHi Pr,1979–2020).The characteristics of the circulation anomalies and precursors corresponding to the extreme precipitation on the TP in summer during 1979–2020 were *** results showed that the summer extreme precipitation of the TP can be categorized into northwestern(NW),southeastern(SE),and southern Himalayan(HS)types based on extreme precipitation *** NW and SE types are mainly influenced by anomalous signals in the mid-to-high latitude regions upstream of them,whereas the HS type is controlled by the localized subtropical anomalous *** the 8th day before the onset of the NW type,an anomalous cyclone was observed in the western Atlantic Ocean(60°W,50°N),which triggered the west-to-east quasi-latitudinal propagation of Rossby *** the onset day of the NW type,the upper troposphere showed positive-negative-positive geopotential height anomalies along the latitudinal 40°N from the Caspian Sea,the western part of Xinjiang,to the northeastern *** entered from the Arabian Sea along the southeastern edge of the anomalous cyclone on the southwestern TP and converged in the northwestern *** to the NW type,the precursors of the SE type appeared at higher latitudes and were more *** the 8th day before the onset of the SE type,an anomalous cyclone occurred near Greenland(60°W,70°N)and excited Rossby waves propagating *** the onset day of the SE type,the upper troposphere showed negative-positive-negative geopotential height anomalies across Eurasia from the Ural Mountains and the Iranian Plateau to the northern TP in the northwest-southeast directi

关键词： Tibetan Plateau Summer extreme precipitation Atmospheric circulation anomaly Precursor Teleconnection wave train

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Complete Universal Scaling in First-Order Phase Transitions

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Chinese Physics Letters 2024年第10期41卷 8-13页

作者： Fan zhong School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

Phase transitions and critical phenomena are among the most intriguing phenomena in nature and *** are classified into first-order phase transitions(FOPTs)and continuous *** the latter shows marvelous phenomena of scaling and universality,whether the former behaves similarly is a long-standing controversial *** we definitely demonstrate complete universal scaling in field driven FOPTs for Langevin equations in both zero and two spatial dimensions by rescaling all parameters and subtracting nonuniversal contributions with singular dimensions from an effective temperature and a special field according to an effective *** offers a perspective different from the usual nucleation and growth but conforming to continuous phase transitions to study FOPTs.

关键词： theory. transitions scaling

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Key issues on magnetic reconnection at Mercury

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Earth and Planetary Physics 2024年第5期8卷 673-685页

作者： Jun zhong Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

Magnetic reconnection processes and their impact on planetary magnetospheric dynamics exhibit significant differences due to differences in upstream solar wind conditions and internal planetary environments. Current understanding of reconnection phenomena at Mercury is rooted in the MESSENGER mission. However, direct detection of reconnection remains rare. Here, we aim to assess the limitations of MESSENGER in detecting reconnection in Mercury's space and to discuss key issues of reconnection that will be addressed by BepiColombo, including the dynamics of magnetic flux ropes, particle acceleration, density asymmetric reconnection,IMF-driven near-tail structures, and potential modes of magnetospheric convection.

关键词： magnetic reconnection Mercury MESSENGER BepiColombo

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