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Study on HOBEM Based on Analytical Panel Integrals Related to Translating-Pulsating Source for Hydrodynamic Responses of Vessels Sailing in Waves

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China Ocean Engineering 2022年第3期36卷 348-362页

作者： YANG Yun-tao ZHU Ren-chuan LI Yu-long School of Naval Architecture and Civil Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea ExplorationSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Technology Centre for Offshore and Marine Singapore(TCOMS)Singapore

A higher-order boundary element method(HOBEM)incorporated with analytical panel integrals related to translat-ing-pulsating source Green’s function is proposed for the hydrodynamic response prediction of ships advancing in *** this method,the 9-node bi-quadratic curvilinear elements employed to discretize the mixed-source/dipole boundary integral equation are mapped into the parametric plane through a coordinate *** in order to ease the numerical instability problem,a novel analytical quadrature is derived to calculate the influence coefficients by changing the integral order and using integration by *** singularity caused by infinite discontinuity is analyzed and eliminated by adopting some mathematical *** the calculations of panel integrals of Green’s function and its x-derivative,the analytical integral method is proved to be always accurate even for field points approaching the free surface,where numerical quadrature is impossible to give reasonable *** on this,a higher-order seakeeping program is developed and applied in the motion response prediction of two different types of ships(i.e.,a wall-sided ship Wigley III and a non-wall-sided ship S175).By comparing the computed results with the corresponding experimental data and numerical solutions of the translating-pulsating and higher-order Green’s function methods based on traditional Gauss quadrature,it is found that the HOBEM based on analytical quadrature is of better accuracy and *** the non-wall-sided ship,only the present method can produce reasonable pre-diction of motion responses,while obvious oscillatory phenomenon is observed in the results of the other two numerical methods based on Gauss quadrature.

关键词： HOBEM translating-pulsating Green’s function analytical quadrature seakeeping forward speed

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Surface Engineered Ru_(2)Ni Multilayer Nanosheets for Hydrogen Oxidation Catalysis

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CCS Chemistry 2023年第8期5卷 1931-1941页

作者： Juntao Zhang Xing Fan Suling Wang Maofeng Cao Lingzheng Bu Yong Xu Haiping Lin Xiaoqing Huang College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005 Institute of Functional Nano and Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123 Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006 School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119

The hydrogen oxidation reaction(HOR)in alkaline conditions is of great importance for the application of anion exchange membrane fuel cells(AEMFCs).However,the electrocatalysts for alkaline HOR generally suffer from the disadvantage of sluggish ***,we have fabricated Ru2Ni multilayered nanosheets(Ru2Ni MLNSs)in the layer-by-layer manner and engineered the surface properties via postannealing for efficient alkaline *** investigations reveal that such annealing at different temperatures can alter the surface properties of Ru2Ni MLNSs and thus regulate their adsorption abilities toward*H and**** particular,the optimal catalyst exhibits a mass activity of 4.34 A mgRu−1 at an overpotential of 50 mV,which is 18.1 and 13.2 times higher than those of Ru/C(0.24 A mgRu−1)and Pt/C(0.33 A mgPt−1),*** calculations indicate that the presence of surface O atoms can facilitate the HOR activity while the excessive coverage of O atoms on Ru2Ni surface leads to the strengthened H binding and the decay of HOR *** work not only provides an efficient catalyst for alkaline HOR,but it also may shed new light on the design of high-performance catalysts for electrocatalysis and *** have fabricated Ru2Ni multilayer nanosheets(Ru2Ni MLNSs)and realized the surface engineering via an annealing *** investigations show that such surface engineering can regulate the surface properties and thus promote the alkaline HOR ***,the optimal catalyst exhibits a much higher activity than those of commercial Ru/C and Pt/C and is a promising catalyst for alkaline HOR.

关键词： surface engineering Ru2Ni multilayered nanosheet synergy surface O atom hydrogen oxidation catalysis

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Dislocation-strained MoS_(2)nanosheets for high-efficiency hydrogen evolution reaction

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Nano Research 2022年第6期15卷 4996-5003页

作者： Shihao Wang Longlu Wang Lingbin Xie Weiwei Zhao Xia Liu Zechao Zhuang YanLing Zhuang Jing Chen Shujuan Liu Qiang Zhao College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)and Institute of Flexible Electronics(Future Technology)Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Department of Chemistry Tsinghua UniversityBeijing 100084China

Defect engineering is one of the effective strategies to optimize the physical and chemical properties of molybdenum disulfide(MoS_(2))to improve catalytic hydrogen evolution reaction(HER)***,as a typical defect structure,are worthy of further investigation due to the versatility and sophistication of structures and the influence of local strain effects on the catalytic ***,this study adopted a low-temperature hydrothermal synthesis strategy to introduce numerous dislocation-strained structures into the in-plane and out-of-plane of MoS_(2)*** HER catalytic activity of 5.85 mmol·g^(−1)·h^(−1)under visible light was achieved based on the high-density dislocations and the corresponding strain *** work paves a new pathway for improving the catalytic activity of MoS_(2)via a dislocation-strained synergistic modulation strategy.

关键词： molybdenum disulfide dislocation strain hydrogen evolution reaction

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Evaluation of Continual Learning Methods for Object Hardness Recognition

Evaluation of Continual Learning Methods for Object Hardness...

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Liu, Yiwen Fang, Senlin Liu, Chengliang Wang, Jingnan Mai, Ke Zhang, Yupo Yi, Zhengkun Wu, Xinyu Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China Shenzhen Institute of Artificial Intelligence and Robotics for Society Siat Branch Shenzhen518055 China City University of Macau Faculty of Data Science 999078 China

ISBN: (纸本)9798350327182

How to solve the problem of continual learning of robotic tactile perception in an open, dynamic environment is a pressing task. Although continual learning has been extensively studied in computer vision, the evaluation of those algorithms does not provide insights on whether their solutions may help continual learning in the context of tactile robotics. In this paper, we propose a continual learning scenario in the robotic tactile domain, and design experiments with tactile hardness dataset that allow us to compare the performance of many continual learning algorithms in the tactile domain. We examine the performance of regularization-based and replay methods in the tactile domain and discuss the effect of replay number on model performance. We show that regularization-based methods do not perform well on the tactile dataset. On the contrary, replay methods can maintain better anti-forgetting performance, but the number of model parameters will be larger, and the training time will be longer. We also found that the replay ratio should be higher than 0.2 to maintain the performance of the replay method on the tactile hardness dataset. © 2023 IEEE.

关键词： robotics

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Dissolvable temporary barrier:a novel paradigm for flexible hydrogel patterning in organ-on-a-chip models

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Bio-Design and Manufacturing 2024年第2期7卷 153-166页

作者： Ding Wang Qinyu Li Chenyang Zhou Zhangjie Li Kangyi Lu Yijun Liu Lian Xuan Xiaolin Wang Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Ophthalmology LKS Faculty of MedicineThe University of Hong KongHong Kong 999077China Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Shanghai Jiao Tong UniversityShanghai 200240China National Center for Translational Medicine(Shanghai)SHU Branch Shanghai UniversityShanghai 200444China

A combination of hydrogels and microfluidics allows the construction of biomimetic three-dimensional(3D)tissue models in vitro,which are also known as *** hydrogel patterningwith awell-controlled spatial distribution is typically achieved by embedding sophisticated microstructures to act as a ***,these physical barriers inevitably expose cells/tissues to a less physiologically relevant microenvironment than in vivo ***,we present a novel dissolvable temporary barrier(DTB)strategy that allows robust and flexible hydrogel patterning with great freedom of design and desirable flow stimuli for cellular *** key aspect of this approach is the patterning of a water-soluble rigid barrier as a guiding path for the hydrogel using stencil printing technology,followed by a barrier-free medium perfusion after the dissolution of the *** and multiple tissue compartments with different geometries can be established using either straight or curved DTB *** effectiveness of this strategy is further validated by generating a 3D vascular network through vasculogenesis and angiogenesis using a vascularized microtumor *** a new proof-of-concept in vasculature-on-a-chip,DTB enables seamless contact between the hydrogel and the culture medium in closed microdevices,which is an improved protocol for the fabrication ofmultiorgan ***,we expect it to serve as a promising paradigm for organ-on-a-chip devices for the development of tumor vascularization and drug evaluation in the future preclinical studies.

关键词： Dissolvable temporary barrier Hydrogel patterning Microfluidics Organ-on-a-chip Vascularization

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Nerve function restoration following targeted muscle reinnervation after varying delayed periods

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Neural Regeneration Research 2023年第12期18卷 2762-2766页

作者： Yuanheng Li Jiangping Huang Yuling Chen Shanshan Zhu Zhen Huang Lin Yang Guanglin Li Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong ProvinceChina Department of Rehabilitation Medicine Guangzhou University of Chinese MedicineGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine Yibin Hospital of Traditional Chinese MedicineYibinSichuan ProvinceChina

Targeted muscle reinnervation has been proposed for reconstruction of neuromuscular function in ***,it is unknown whether performing delayed targeted muscle reinnervation after nerve injury will affect restoration of *** this rat nerve injury study,the median and musculocutaneous nerves of the forelimb were *** proximal median nerve stump was sutured to the distal musculocutaneous nerve stump immediately and 2 and 4 weeks after surgery to reinnervate the biceps *** targeted muscle reinnervation,intramuscular myoelectric signals from the biceps brachii were *** amplitude gradually increased with *** brachii myoelectric signals and muscle fiber morphology and grooming behavior did not significantly differ among rats subjected to delayed target muscle innervation for different *** muscle reinnervation delayed for 4 weeks can acquire the same nerve function restoration effect as that of immediate reinnervation.

关键词： biceps brachii delayed nerve repair delayed targeted muscle reinnervation functional reconstruction grooming test implanted electrode intramuscular myoelectric signals median nerve motor function nerve transfer

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Lawn weed recognition based on fused feature fuzzy C-means clustering algorithm

Lawn weed recognition based on fused feature fuzzy C-means c...

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第42届中国控制会议

作者： Yetao Yao Chunjian Hua Airong Zhang School of Mechanical Engineering Jiangnan University Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology

For lawn,weeds are one of the important factors that cause its degradation and endanger agricultural *** order to achieve accurate application of herbicides for lawn weed management,aiming at the problem that weeds are difficult to be segmented due to the similar color between weeds and lawns in natural environment,this paper proposed an improved fuzzy C-means(FCM) clustering segmentation ***,the region of interest was extracted by extra-green segmentation and converted to HSV space for multi-channel difference fusion for image preprocessing to expand the feature difference between weeds and ***,the median filtering was carried out under the constraint of area area to remove the lawn background noise in the preprocessed image while maintaining the details of weed ***,an anisotropic detection operator of difference of gray distribution(DGD) was proposed,which introduces the features of different directions of gray distribution around pixels in the clustering process to achieve lawn weed ***,one versus rest support vector machines(OVR SVMs) were constructed to solve the multi classification problem of lawn *** solve the problem that weeds overlap and occlude each other,which leads to the reduction of local area identification,an optimization method of extracting feature information from image blocks is *** experimental results show that,compared with the traditional FCM algorithm,the algorithm in this paper has a better suppression effect on most noise areas,can effectively segment and identify weeds in the natural environment,which has practical application value.

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Design of a Novel Autonomous Docking System With a Supporting Robotic Fish

Design of a Novel Autonomous Docking System With a Supportin...

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Dong, Huijie Zhao, Chunyang Qiao, Tiezhu Wang, Jian Chen, Di Meng, Yan Yu, Junzhi Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan030024 China Chinese Academy of Sciences Laboratory of Cognitive and Decision Intelligence for Complex System Institute of Automation Beijing100190 China Peking University State Key Laboratory for Turbulence and Complex Systems Department of Advanced Manufacturing and Robotics College of Engineering Beijing100871 China Guangdong Ocean University College of Electronics and Information Engineering Zhanjiang524088 China

ISBN: (纸本)9798350327182

Underwater supporting robots serving as a relay of energy supplements and communication for other underwater equipment are promising for ocean exploration, development, and protection. This paper proposes a novel autonomous docking system centered on a designed supporting robotic fish named 'CourierFish'. Specifically, CourierFish is capable of docking with a surface dock station for supplying itself and docking with a seafloor platform for supporting equipment in the platform. A visual navigation scheme integrating LED and ArUco markers is presented for accurate localization. The control approach for docking motion is also illustrated. Simulations and aquatic experiments are performed to verify the feasibility of the proposed docking system. The obtained results lay a solid foundation for the construction of various underwater equipment and robot networks. © 2023 IEEE.

关键词： Fish

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Recognition of Citrus on Trees in Different Growth Periods

Recognition of Citrus on Trees in Different Growth Periods

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第42届中国控制会议

作者： Guangze Chen Chunjian Hua Zijun Zhang School of Mechanical Engineering Jiangnan University Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology

Aiming at the problem of citrus identification in different growth periods,this paper proposes a detection method improved manifold ranking based on graph to realize the status monitoring and yield evaluation of green citrus in growth periods;to realize target recognition of mature yellow citrus and help automatic ***,aiming at the problem of uneven image brightness,this paper uses a method combining fuzzy set theory and local contrast to enhance the ***,to solve the problem of inaccurate detection caused by the traditional manifold ranking algorithm relying on the prior edge,a method combining the relative total variation and local complexity is used to extract the foreground to remove the boundary foreground hyperpixel *** manifold ranking,the saliency map is ***,the saliency map is merged with the foreground and then the final saliency map is obtained by manifold ranking *** addition,experiments have found that there is a problem of edge information loss during citrus ***,this paper proposes a segmentation optimization method that combines Otsu method and hyperpixel segmentation *** experimental results show that the algorithm can effectively recognize green and yellow citrus regions,and the recognition accuracy of yellow citrus is slightly higher than that of green citrus,in which the segmentation accuracy of green and yellow citrus is 94.87% and 97.08% respectively.

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Clarifying stress corrosion cracking behavior of biomedical Mg-Gd-Zn-Zr alloy

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Journal of Magnesium and Alloys 2024年

作者： Dong, Qiangsheng Jiang, Jiahao Zhang, Jinghuai Hu, Zhi Zhang, Xiaobo Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and Engineering Nanjing Institute of Technology Nanjing211167 China Jiangsu Key Laboratory for Light Metal Alloys Baowu Magnesium Technology Co. LTD Nanjing211211 China Key Laboratory of Superlight Material and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China School of Advanced Manufacturing Nanchang University Nanchang330031 China

Implants are inevitably subjected to stress corrosion, bringing serious challenges to the controlled degradation of biomedical Mg alloys. It is worth studying the stress corrosion cracking (SCC) behavior of Mg alloy and exploring Mg alloy with good SCC resistance for wide biomedical applications. In this work, the as-cast and as-extruded Mg-3Gd-1Zn-0.4Zr (GZ31K) alloys with uniform corrosion were used to investigate SCC behavior. The as-extruded GZ31K alloy exhibited better corrosion resistance and mechanical properties than the as-cast one mainly owing to grain refinement and uniformly distributed fine precipitates, and possessed superior SCC resistance. To clarify the SCC mechanism, the slow strain rate tests were assisted with applied constant potentials via an electrochemical workstation. Accelerated anodic dissolution at anodic polarization deteriorated SCC resistance due to the initiation of corrosion pits and micro-cracks. However, cathodic polarization had no obvious effects on SCC resistance, along with both retarded corrosion and accelerated hydrogen evolution. Stacking faults in GZ31K alloy were hydrogen capture containers to reduce the effect of hydrogen on SCC resistance during cathodic polarization. These findings provide new insights into the evaluation of SCC mechanism, and offer more opportunities to explore Mg alloys with good SCC resistance by regulating anodic dissolution. © 2024

关键词： Corrosion resistance

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