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Laser-driven programmable non-contact transfer printing of objects onto arbitrary receivers via an active elastomeric microstructured stamp

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National Science Review 2020年第2期7卷 296-304页

作者： Hongyu Luo chengjun wang Changhong Linghu Kaixin Yu Chao wang Jizhou Song Department of Engineering Mechanics Soft Matter Research Center and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University

Transfer printing, as an important assembly technique, has attracted much attention due to its valuable merits to develop novel forms of electronics such as stretchable inorganic electronics requiring the heterogeneous integration of inorganic materials with soft elastomers. Here, we report on a laser-driven programmable non-contact transfer printing technique via a simple yet robust design of active elastomeric microstructured stamp that features cavities filled with air and embedded under the contacting surface, a micro-patterned surface membrane that encapsulates the air cavities and a metal layer on the inner-cavity surfaces serving as the laser-absorbing layer. The micro-patterned surface membrane can be inflated dynamically to control the interfacial adhesion, which can be switched from strong state to weak state by more than three orders of magnitude by local laser heating of the air in the cavity with a temperature increase below 100℃. Theoretical and experimental studies reveal the fundamental aspects of the design and fabrication of the active elastomeric microstructured stamp and the operation of non-contact transfer printing. Demonstrations in the programmable transfer printing of micro-scale silicon platelets and micro-scale LED chips onto various challenging receivers illustrate the extraordinary capabilities for deterministic assembly that are difficult to address by existing printing schemes, thereby creating engineering opportunities in areas requiring the heterogeneous integration of diverse materials such as curvilinear electronics and Micro LED displays.

关键词： tunable adhesion transfer printing heterogeneous integration laser-driven

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Transfer printing techniques for flexible and stretchable inorganic electronics

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npj Flexible Electronics 2018年第1期2卷 199-212页

作者： Changhong Linghu Shun Zhang chengjun wang Jizhou Song Department of Engineering Mechanics Soft Matter Research Centerand Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang University310027 HangzhouChina

Transfer printing is an emerging deterministic assembly technique for micro-fabrication and nano-fabrication,which enables the heterogeneous integration of classes of materials into desired functional *** creates engineering opportunities in the area of flexible and stretchable inorganic electronics with equal performance to conventional wafer-based devices but the ability to be deformed like a rubber,where prefabricated inorganic semiconductor materials or devices on the donor wafer are required to be transfer-printed onto unconventional flexible *** paper provides a brief review of recent advances on transfer printing techniques for flexible and stretchable inorganic *** basic concept for each transfer printing technique is *** performances of these transfer printing techniques are summarized and compared followed by the discussions of perspectives and challenges for future developments and applications.

关键词： printing inorganic discussions

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Real-Time Detection and Instance Segmentation of Strawberry in Unstructured Environment

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Computers, Materials & Continua 2024年第1期78卷 1481-1501页

作者： chengjun wang Fan Ding Yiwen wang Renyuan Wu Xingyu Yao Chengjie Jiang Liuyi Ling School of Artificial Intelligence Anhui University of Science and TechnologyHuainan232001China School of Mechanical Engineering Anhui University of Science and TechnologyHuainan232001China

The real-time detection and instance segmentation of strawberries constitute fundamental components in the development of strawberry harvesting ***-time identification of strawberries in an unstructured envi-ronment is a challenging *** instance segmentation algorithms for strawberries suffer from issues such as poor real-time performance and low *** this end,the present study proposes an Efficient YOLACT(E-YOLACT)algorithm for strawberry detection and segmentation based on the YOLACT *** key enhancements of the E-YOLACT encompass the development of a lightweight attention mechanism,pyramid squeeze shuffle attention(PSSA),for efficient feature ***,an attention-guided context-feature pyramid network(AC-FPN)is employed instead of FPN to optimize the architecture’s ***,a feature-enhanced model(FEM)is introduced to enhance the prediction head’s capabilities,while efficient fast non-maximum suppression(EF-NMS)is devised to improve non-maximum *** experimental results demonstrate that the E-YOLACT achieves a Box-mAP and Mask-mAP of 77.9 and 76.6,respectively,on the custom ***,it exhibits an impressive category accuracy of 93.5%.Notably,the E-YOLACT also demonstrates a remarkable real-time detection capability with a speed of 34.8 *** method proposed in this article presents an efficient approach for the vision system of a strawberry-picking robot.

关键词： YOLACT real-time detection instance segmentation attention mechanism strawberry

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Research on Solidification Structure of Billet for Bearing Steel

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稀有金属材料与工程 2011年第S3期40卷 220-223页

作者： Liu chengjun, wang Hongpo, Jiang Maofa Northeastern University, Shenyang 110004, China Northeastern Univ Coll Mat & Met Shenyang 110004 Peoples R China

Secondary dendrite arm spacing (SDAS), which is an important parameter for solidification structure, has a significant effect on the level of segregation and the time for dispelling micro-segregation. The solidification structure of billets, poured under different drawing speeds for high-carbon chromium continuous casting and etched by saturated water solution of picric acid, was investigated by OLYMPUS BX51 optical microscope; and the indexes of carbon and sulfur segregation were also determined. It is concluded that the solidification structure consists of fine grain region, columnar region, cross dendrite region and central equiaxed grain region. In the columnar grain region, the SDAS at outer arc of billet is about 30 μm bigger than that of inner arc; the SDAS increases with the increasing drawing speed and the indexed of carbon and sulfur segregation change from positive segregation to the negative with the increasing SDAS. The SDAS can be used as an important parameter not only to establish reasonable secondary cooling system and drawing speed but also to judge the level of segregation in the unidirectional solidification region.

关键词： bearing steel solidification structure secondary dendrite arm spacing drawing speed segregation

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Transient thermo-mechanical analysis for bimorph soft robot based on thermally responsive liquid crystal elastomers

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Applied Mathematics and Mechanics(English Edition) 2019年第7期40卷 943-952页

作者： Yun CUI Yafei YIN chengjun wang K. SIM Yuhang LI Cunjiang YU Jizhou SONG Institute of Solid Mechanics Beihang University Beijing 100191 China Department of Engineering Mechanics Soft Matter Research Center Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Hangzhou 310027 China Materials Science and Engineering Program University of Houston Houston TX 77204 U. S.A. State Key Laboratory of Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical Engineering University of Houston Houston TX 77204 U. S.A. Department of Electrical and Computer Engineering University of Houston Houston TX 77204 U. S.A. Department of Biomedical Engineering Texas Center for Superconductivity University of Houston Houston TX 77204 U. S.A.

Thermally responsive liquid crystal elastomers (LCEs) hold great promise in applications of soft robots and actuators because of the induced size and shape change with temperature. Experiments have successfully demonstrated that the LCE based bimorphs can be effective soft robots once integrated with soft sensors and thermal actuators. Here, we present an analytical transient thermo-mechanical model for a bimorph structure based soft robot, which consists of a strip of LCE and a thermal inert polymer actuated by an ultra-thin stretchable open-mesh shaped heater to mimic the unique locomotion behaviors of an inchworm. The coupled mechanical and thermal analysis based on the thermo-mechanical theory is carried out to underpin the transient bending behavior, and a systematic understanding is therefore achieved. The key analytical results reveal that the thickness and the modulus ratio of the LCE and the inert polymer layer dominate the transient bending deformation. The analytical results will not only render fundamental understanding of the actuation of bimorph structures, but also facilitate the rational design of soft robotics.

关键词： transient thermo-mechanical analysis soft robot thermal-responsive liq- uid crystal elastomer (LCE)

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An Efficient Method for Identifying Lower Limb Behavior Intentions Based on Surface Electromyography

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Computers, Materials & Continua 2023年第12期77卷 2771-2790页

作者： Liuyi Ling Yiwen wang Fan Ding Li Jin Bin Feng Weixiao Li chengjun wang Xianhua Li School of Artificial Intelligence Anhui University of Science and TechnologyHuainan232001China Institute of Environment-Friendly Materials and Occupational Health Anhui University of Science and TechnologyWuhu241003China School of Electrical&Information Engineering Anhui University of Science and TechnologyHuainan232001China School of Mechanical Engineering Anhui University of Science and TechnologyHuainan232001China

Surface electromyography(sEMG)is widely used for analyzing and controlling lower limb assisted exoskeleton *** intention recognition based on sEMG is of great significance for achieving intelligent prosthetic and exoskeleton *** highly efficient recognition while improving performance has always been a significant *** address this,we propose an sEMG-based method called Enhanced Residual Gate Network(ERGN)for lower-limb behavioral intention *** proposed network combines an attention mechanism and a hard threshold function,while combining the advantages of residual structure,which maps sEMG of multiple acquisition channels to the lower limb motion ***,continuous wavelet transform(CWT)is used to extract signals features from the collected sEMG ***,a hard threshold function serves as the gate function to enhance signals quality,with an attention mechanism incorporated to improve the ERGN’s performance *** results demonstrate that the proposed ERGN achieves extremely high accuracy and efficiency,with an average recognition accuracy of 98.41%and an average recognition time of only 20 ms-outperforming the state-of-the-art research *** research provides support for the application of lower limb assisted exoskeleton robots.

关键词： sEMG movement intention efficient network convolutional neural network

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Nitrogen monoxide vector of ultrasonic atomizing inhalation improves vertebro-basilar artery insufficiency Hemodynamic changes are detected by transcranial Doppler test

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Neural Regeneration Research 2007年第8期2卷 506-509页

作者： Donghong Xu Jinfeng Liu Zhaohui Li Ailing wang chengjun Zhao Fourth People＇s Hospital of Jinan Jinan 250031 Shandong Province China

BACKGROUND： Latest researches at home and abroad indicate that glycerol trinitrate plays its function because it can metabolize into nitrogen monoxide （NO） in vivo. OBJECTIVE： To study the therapeutic effects of NO vector of ultrasonic atomizing inhalation on vertebro-basilar artery insufficiency （VBI） through transcranial Doppler （TCD） detection and serum NO content and indirect effect of TCD on cerebral blood flow changes. DESIGN： Randomized grouping and controlled clinical study. SETTING： Department of Neurology, the Fourth People＇s Hospital of Jinan. PARTICIPANTS： A total of 130 patients who were diagnosed as VBI were selected from Department of Neurology, the Fourth People＇s Hospital of Jinan from December 2001 to December 2005. The involved inpatients were checked by CT and MRI, and met the VBI diagnostic standard enacted by the Fourth National Academic Meeting of Cerebrovascular Disease in 1995. All patients and their relatives provided the confumed consent. They were randomly divided into low-dose treatment group （n =60）, high-lose treatment group （n =30） and control group （n =40）. METHODS： Patients in the low-dose and high-dose treatment groups were given ultrasonic atomizing inhalation of 3 mg and 5 mg glycerol trinitrate, respectively, for 20 minutes, once a day. In addition, ligustrazine and energy mixture were used once a day for three days in a course. Cases in the control group were only given ligustrazine and energy mixture. All selected cases accepted TCD, blood NO content was checked at the time of beginning, after the first time and after a period of treatment. According to the TCD test, VBI patients were divided into two groups （high-low flow velocity）. The vertebral artery （VA） and basal artery （BA） of left or right sides were detected by 2 Hz detector via occipital window. MAIN OUTCOME MEASURES： ①Blood flow velocity of systolic phase, blood flow velocity of diastole phase and vascular resistance in left and right VA and BA detected by using TCD

关键词： ultrasonic atomizing inhalation nitroglyceride vertebro-basilar artery insufficiency nitricoxide ultrasonography, Doppler, transcranial

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基于TRIZ理论的回水阀开口挡圈装配机创新设计

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山东理工大学学报（自然科学版） 2025年第1期39卷 65-72页

作者：何涛刘龙王成军李文君龚宝春罗刚安徽理工大学机电工程学院安徽淮南232001 安徽理工大学安徽省创新方法推广应用与示范基地安徽淮南232001 安徽理工大学数学与大数据学院安徽淮南232001

为解决地暖回水阀开口挡圈装配效率低的问题,基于TRIZ理论对回水阀开口挡圈装配机进行创新设计。通过九屏幕分析法提出了解决问题的方向,通过功能分析法得到了系统存在的问题,采用因果分析法得出了问题产生的根本原因。运用技术矛盾法... 详细信息

为解决地暖回水阀开口挡圈装配效率低的问题,基于TRIZ理论对回水阀开口挡圈装配机进行创新设计。通过九屏幕分析法提出了解决问题的方向,通过功能分析法得到了系统存在的问题,采用因果分析法得出了问题产生的根本原因。运用技术矛盾法、物理矛盾法、物-场模型法解决了装配开口挡圈效率低的问题,并提出了11条解决方案,进而设计出一种回水阀开口挡圈装配机。通过ANSYS软件进行压环装置的应力应变仿真,验证了装置强度的可靠性;通过ADAMS软件进行传动过程的运动仿真,验证了设计方案的合理性。本研究为回水阀开口挡圈装配机的创新设计提供了新思路。

关键词： TRIZ理论开口挡圈装配 ANSYS ADAMS

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More International Cooperation for Better Buildings

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International Understanding 2017年第2期 28-32页

作者： wang chengjun wang Shan Beijing Municipal Commission of Housing and Urban-rural Development

*** cooperation in building consultancy&design in Beijing Generally,developed countries such as the UK,France,USA and Australia are leading in the world in building consultancy & design,as some landmark buildings in B... 详细信息

关键词： for on more In it of More International Cooperation for Better Buildings mode in than is that TFP have

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Characteristics and source attribution of PM2.5 during 2016 G20 Summit in Hangzhou: Efficacy of radical measures to reduce source emissions

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Journal of Environmental Sciences 2021年第8期33卷 47-65页

作者： Ke Chen Sarah E.Metcalfe Huan Yu Jingsha Xu Honghui Xu Dongsheng Ji chengjun wang Hang Xiao Jun He Department of Chemical and Environmental Engineering University of Nottingham Ningbo ChinaNingbo315100China School of Geography University of NottinghamNottinghamNG72RDUK Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan430074China School of Geography Earth and Environmental SciencesUniversity of BirminghamEdgbastonBirminghamB152TTUnited Kingdom Zhejiang Institute of Metrological Sciences Hangzhou310008China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China College of Resources and Environmental Science South-Central University for NationalitiesWuhan430074China Centre for Excellence in Regional Atmos.Environ.Institute of Urban Environment Chinese Academy SciencesXiamen361021China Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province University of Nottingham Ningbo ChinaNingbo315100China

A field campaign was conducted to study the PM2.5 and atmospheric gases and aerosol’s components to evaluate the efficacy of radical measures implemented by the Chinese government to improve air quality during the 2016 G20 Summit in Hangzhou *** lower level of PM2.5(32.48±11.03μg/m3)observed during the control period compared to precontrol and post-control periods showed that PM2.5 was alleviated by control *** on the mass concentrations of particulate components,the emissions of PM2.5 from local sources including fossil fuel,coal combustion,industry and construction were effectively reduced,but non-exhaust emission was not reduced as effectively as *** accumulation of SNA(SO42-,NO3-,NH4+)was observed during the control period,due to the favourable synoptic weather conditions for photochemical reactions and heterogeneous *** of transboundary transport during the control period,air masses from remote areas contributed significantly to local ***,secondary organic carbon(OCsec)exhibited more sensitivity than primary organic carbon(OCpri)to control measures,and the increased nitrogen oxidation ratio(NOR)implied the regional transport of aged sec-ondary aerosols to the study ***,the results from various approaches revealed that local pollution sources were kept under control,indicating that the implementation of mitigation measures were helpful in improving the air quality of Hangzhou during G20 *** reduce ambient levels of PM2.5 further in Hangzhou,regional control policies may have to be taken so as to reduce the impact of long-range transport of air masses from inland China.

关键词： G20 Summit PM2.5 Long-range transport CMB model

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