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Piezoelectric Drop-on-Demand Inkjet Printing with Ultra-High Droplet Velocity

Research 2024年第3期2023卷 123-137页

作者： Zhengjie Yang Hongmiao Tian chunhui wang Xiangming Li Xiaoliang Chen Xiaoming Chen Jinyou Shao State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’anShaanxi 710049China.

Improving droplet velocity as much as possible is considered as the key to improving both printing speed and printing distance of the piezoelectric drop-on-demand inkjet printing *** are 3 tough and contradictory issues that need to be addressed simultaneously,namely,the actuation pressure of the piezoelectric printhead,satellite droplets,and the air resistance,which seems almost impossible to achieve with classical ***,a novel solution is *** modulating the positive crosstalk effect inside and outside the printhead,self-tuning can be achieved,including self-reinforcing of the actuation pressure,self-restraining of satellite droplets,and self-weakening of the air resistance,thereby greatly improving droplet *** on these mechanisms,waveform design methods for different inks and printheads are *** results demonstrate that monodisperse droplet jetting with a maximum velocity of 27.53 m/s can be achieved,reaching 3 to 5 times that of the classical method(5 to 8 m/s).Correspondingly,the printing speed and distance can be simultaneously increased by almost 10 times,demonstrating an ability of direct printing on irregular ***,the compatibility of ink materials is expanded,as the Ohnesorge number and the viscosity of printable inks for the printhead used are increased from 0.36–0.72 to 0.03–1.18 and from 10–12 cp to 1–40.3 cp,respectively,even breaking the traditional limitations of the piezoelectric printing technology(Ohnesorge number of 0.1 to 1;viscosity of 1 to 25 cp).All the above provide a new perspective for improving droplet velocity and may even offer a game-changing choice for expanding the boundaries of the piezoelectric drop-on-demand inkjet printing technology.

关键词： piezoelectric viscosity thereby

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AstroPose:Astronaut pose estimation using a monocular camera during extravehicular activities

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Science China(Technological Sciences) 2024年第6期67卷 1933-1945页

作者： LIU ZiBin LI You wang chunhui LIU Liang GUAN BangLei SHANG Yang YU QiFeng College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China Key Laboratory of Human Factors Engineering China Astronaut Research and Training CenterBeijing100094China

With the completion of the Chinese space station,an increasing number of extravehicular activities will be executed by astronauts,which is regarded as one of the most dangerous activities in human space *** guarantee the safety of astronauts and the successful accomplishment of missions,it is vital to determine the pose of astronauts during extravehicular *** article presents a monocular vision-based pose estimation method of astronauts during extravehicular activities,making full use of the available observation ***,the camera is calibrated using objects of known structures,such as the spacesuit backpack or the circular handrail outside the space ***,the pose estimation is performed utilizing the feature points on the *** proposed methods are validated both on synthetic and semi-physical simulation experiments,demonstrating the high precision of the camera calibration and pose *** further evaluate the performance of the methods in real-world scenarios,we utilize image sequences of Shenzhou-13 astronauts during extravehicular *** experiments validate that camera calibration and pose estimation can be accomplished solely with the existing observation resources,without requiring additional complicated *** motion parameters of astronauts lay the technological foundation for subsequent applications such as mechanical analysis,task planning,and ground training of astronauts.

关键词： monocular camera astronaut pose estimation camera calibration

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International standard of Traditional Chinese Medicine techniques: the operating specifications for Chinese medicated bath(2022)

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Journal of Traditional Chinese Medicine 2024年第4期44卷 851-854页

作者： ZHANG Jing wang chunhui JIN Xinyan YU Miao FAN Yingyi HAN Xiaoli PEI Xiaohua Department of dermatology Beijing University of Chinese Medicine Third Affiliated HospitalBeijing 100029China Department of Chest and Breast Surgery Beijing University of Chinese Medicine Xiamen HospitalXiamen361001China Center for Evidence-Based Medicine Beijing University of Chinese MedicineBeijing 100029China Department of General surgery Beijing Hospital of Traditional Chinese Medicine affiliated to Capital Medical UniversityBeijing 100010China Department of Breast Surgery Beijing University of Chinese Medicine Third Affiliated HospitalBeijing 100029China

Chinese medicated bath is one of the external therapies in Traditional Chinese Medicine(TCM),which has been widely used ***“International Standard of Traditional Chinese Medicine Techniques:The Operating Specifications for Chinese Medicated Bath”is drawn up by the Beijing University of Chinese Medicine Third Affiliated Hospital and Beijing University of Chinese Medicine Xiamen Hospital in collaboration with domestic TCM universities and *** specification includes definition,operating process,points for attention and *** is targeted to provide reference for TCM providers at home and abroad with TCM background in clinical decision-making.

关键词： Chinese medicated bath international standard traditional Chinese medical technology operating specifications

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A Two-step Inverse Method for Quantitative Damage Evaluation of Plate-like Structures Using Vibration Approach

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Journal of Dynamics, Monitoring and Diagnostics 2024年第1期3卷 32-39页

作者： Shuai He Jiaxin Li Xuejing Wu chunhui wang Tianran Lin Qingdao Key Rail Transportation Laboratory for Noise and Vibration Control&Automated Fault Diagnostic Qingdao University of TechnologyQingdao 266520China School of Mechanical and Manufacturing Engineering The University of New South WalesKingston 2052Australia

This study presents a novel two-step approach to assess plate-like structural laminar damages,particularly for delamination damage detection of composite ***,a 2-D continuous wavelet transform is employed to identify the damage location and sizes from vibration curvature *** inverse method is subsequently then used to determine the bending stiffness reduction ratio along a specified direction,enabling the quantification of the delamination *** method employed in this study is an extension of the one-dimensional inverse method developed in a previous work of the *** applicability of the two-step inverse approach is demonstrated in a simulation analysis and by an experimental study on a cantilever composite plate containing a single *** inverse method is shown to have the capacity to reveal the detailed damage information of delamination within a constrained searching space and can be used to determine the effective flexural stiffness of composite plate structures,even in cases of complex delamination damage.

关键词： 2-D continuous wavelet transform damage quantification delamination damage inverse method vibration

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Ultra-thin robust CNT@GC film integrating effective electromagnetic shielding and flexible Joule heating

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Nano Research 2024年第5期17卷 3462-3471页

作者： Ding Zhang chunhui wang Meng Li Weixue Meng Shipeng Zhang Mengdan Yang Xinguang Huang Yingjiu Zhang Yuanyuan Shang Anyuan Cao Key Laboratory of Materials Physics(Ministry of Education) School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450052China Electron Microscopy Center Yunnan UniversityKunming650091China School of Materials Science and Engineering Peking UniversityBeijing100871China

The demand for lightweight,thin electromagnetic interference(EMI)shielding film materials with high shielding effectiveness(SE),excellent mechanical properties,and stability in complex environments is particularly pronounced in the realm of flexible and portable electronic ***,we developed an ultra-thin film(CNT@GC)in which the glassy carbon(GC)layer wrapped around and welded carbon nanotubes(CNTs)to form a core-shell network structure,leading to exceptional tensile strength(327.2 MPa)and electrical conductivity(2.87×10^(5) S·m^(−1)).The CNT@GC film achieved EMI SE of 60 dB at a thickness of 2µm after post-acid treatment and high specific SE of 3.49×10^(5) dB·cm^(2)·g^(−1),with comprehensive properties surpassing those of the majority of previous shielding ***,the CNT@GC film exhibited Joule heating capability,reaching a surface temperature of 135℃at 3 V with a fast thermal response of about 0.5 s,enabling anti-icing/de-icing *** work presented a methodology for constructing a robust CNT@GC film with high EMI shielding performance and exceptional Joule heating capability,demonstrating immense potential in wearable devices,defense,and aerospace applications.

关键词： core-shell structure ultra-thin lightweight film robust film electromagnetic shielding Joule heating

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Wide hybridizations reveal the robustness of functional centromeres in Triticum-Aegilops species complex lines

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Journal of Genetics and Genomics 2024年第5期51卷 570-573页

作者： Yuhong Huang Qinghua Shi Chen Zhou chunhui wang Yang Liu Congyang Yi Handong Su Fangpu Han State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Bejing 100049China National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhanHubei430070China

The Triticum-Aegilops complex groups demonstrated high cross-affinity with each other to overcome the barriers of distant hybridization(Loureiro et al.,2023).Distant hybridization involves two distinct yet closely related events:hybridization and genome *** studies have indicated that bursts of transposable elements(TEs)can occur as a consequence or concomitant to hybridization or genome duplication(Parisod et al.,2010).This raises an important scientific question regarding how the TEs-rich centromere region copes with genomic shock(McClintock,1984).The Triticum-Aegilops species complexes,particularly in the F1,So,and subsequent early generations resulting from successive selfcrossing,offer an opportunity to investigate whether the centromere environment undergoes reconstruction and the associated mechanisms that maintain genomic stability.

关键词： centromere Triticum complex

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Research on the High-Quality Development of Agricultural Supply Chain Financial Ecosystem Empowered by Science and Technology

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Proceedings of Business and Economic Studies 2024年第5期7卷 98-105页

作者： chunhui wang Qi’en Zhang School of Finance Jilin Business and Technology CollegeChangchun 130507China

A systematic perspective on agricultural supply chain finance can offer fresh insights into its *** high-quality development of the agricultural supply chain finance ecosystem is crucial for the comprehensive revitalization of rural areas and the realization of agricultural *** on the current state of development of this ecosystem,this paper identifies several bottlenecks,such as insufficient policy and technical support in the macro-environment system,weak incentives for independent circulation within the industrial environment system,and inadequate motivation for stakeholders to participate in the micro-environment *** address these issues,this paper proposes that the visualization,digitalization,and authenticity characteristics of the“blockchain+Internet of Things”technology architecture can effectively resolve these ***,targeted strategies are suggested to promote the high-quality development of the agricultural supply chain finance ecosystem.

关键词： Agricultural supply chain finance ecosystem High-quality development Blockchain+Internet of Things

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日本中文教育发展述评

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云南师范大学学报（哲学社会科学版） 2024年第4期56卷 46-56页

作者：王璐王春辉新乡医学院医学人文学院河南新乡453003 北京语言大学中国语言文字规范标准研究中心北京100089 首都师范大学语言治理研究中心北京100089

文章通过历时分析、对比分析、文本分析等方法考察了日本中文教育的具体情况,发现:中文是日本诸多领域中的第二外语,但与作为第一外语的英语间存在显著差距;日本中文线上教学实践中,对线上教学模式基本持有肯定态度,偏好使用YouTube等... 详细信息

文章通过历时分析、对比分析、文本分析等方法考察了日本中文教育的具体情况,发现:中文是日本诸多领域中的第二外语,但与作为第一外语的英语间存在显著差距;日本中文线上教学实践中,对线上教学模式基本持有肯定态度,偏好使用YouTube等视频教学资源。推进日本的中文教育发展,需要在客观把握当前中文教育发展实态的基础上,重视强化中文的领域语言价值,精准分析日本当下中文教育的本地化需求,大力推进中文教育的数字化发展。

关键词：日本中文教育领域语言价值本地化需求数字化二语习得

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二维弱可压缩黏性流体的近场动力学模拟

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华中科技大学学报（自然科学版） 2024年第1期52卷 78-84页

作者：王超张郭杨汪春辉高岩哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001 哈尔滨工程大学青岛创新发展基地山东青岛266000

基于近场动力学理论,采用近场动力学微分算子(PDDO)求解流体连续性方程与动量方程,建立了二维黏性流体运动的近场动力学模型,流体假设为弱可压缩形式.通过二维方腔驱动、溃坝及低雷诺数圆柱绕流三个经典算例验证所建立的流体计算模型在... 详细信息

基于近场动力学理论,采用近场动力学微分算子(PDDO)求解流体连续性方程与动量方程,建立了二维黏性流体运动的近场动力学模型,流体假设为弱可压缩形式.通过二维方腔驱动、溃坝及低雷诺数圆柱绕流三个经典算例验证所建立的流体计算模型在内部流动、自由表面流及绕流问题上的适用性,并与已有试验数据和数值结果进行对比分析.结果表明:建立的近场动力学微分算子流体计算模型能够有效地模拟流体运动的全过程,速度分布曲线的趋势及极值与已有结果具有较好的一致性,并且同样可以清晰地捕捉到流场中的特征.

关键词：近场动力学微分算子弱可压缩流体溃坝圆柱绕流数值模拟

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自然人、机器人、数字人“三人”共生时代的语言生活

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语言战略研究 2024年第3期9卷 7-16页

作者：王春辉首都师范大学语言治理研究中心北京100089

地球似乎正在加速进入一个自然人、机器人、数字人“三人”共生的新时代。总体上呈现出数字化、智能化、自动化的新形态和新特征,相应地,语言生活也正发生着广泛而深刻的变化。在语言运用方面,产生了“自然人-数字人”“数字人-数字人... 详细信息

地球似乎正在加速进入一个自然人、机器人、数字人“三人”共生的新时代。总体上呈现出数字化、智能化、自动化的新形态和新特征,相应地,语言生活也正发生着广泛而深刻的变化。在语言运用方面,产生了“自然人-数字人”“数字人-数字人”“机器人-数字人”“自然人-机器人-数字人”这4种新形态;在语言学习方面,“三人”各自的语言学习与机器人和数字人助力自然人学习遥相呼应;在语言研究方面,新数据、新方法、新思想星火萌发,语言资源学、数字语言学等新兴交叉方向似乎正在加速成形。未来的语言研究,需要把握时代发展趋势,依托整体性视角和系统性思维,为国家和社会发展提供更多更好的助力。

关键词：机器人数字人语言生活人工智能语言治理

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