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Fabrication of Waterproof Artificial Compound Eyes with Variable Field of View Based on the Bioinspiration from Natural Hierarchical Micro–Nanostructures

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Nano-Micro Letters 2020年第12期12卷 13-28页

作者： Peilin Zhou Haibo yu Ya Zhong Wuhao Zou Zhidong wang Lianqing Liu State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016People’s Republic of China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110169People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Department of Advanced Robotics Chiba Institute of TechnologyChiba 275‑0016Japan

Planar and curved microlens arrays(MLAs)are the key components of miniaturized microoptical *** order to meet the requirements for advanced and multipurpose applications in microoptical field,a simple manufacturing method is urgently required for fabricating MLAs with unique properties,such as waterproofness and variable field-of-view(FOV)*** properties are beneficial for the production of advanced artificial compound eyes for the significant applications in complex microcavity environments with high humidity,for instance,miniature medical ***,the simple and effective fabrication of advanced artificial compound eyes still presents significant *** this paper,bioinspired by the natural superhydrophobic surface of lotus leaf,we propose a novel method for the fabrication of waterproof artificial compound *** jet printing was used to fabricate hierarchical MLAs and nanolens arrays(NLAs)on polydimethylsiloxane *** flexible film of MLAs hybridized with NLAs exhibited excellent superhydrophobic property with a water contact angle of 158°.The MLAs film was deformed using a microfluidics chip to create artificial compound eyes with variable FOV,which ranged from 0°to 160°.

关键词： Bioinspired Hierarchical MLAs and NLAs Waterproof artificial compound eyes E-jet printing Microfluidics chip

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Molecular Dynamics Study of Star Polymer Melts under Start-up Shear

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Chinese Journal of Polymer Science 2022年第7期40卷 807-816页

作者： Dong-Dong wang Kai-Feng yu Xiao-Lei Xu Wen-Sheng Xu Key Laboratory of Automobile Materials Ministry of Education and College of Materials Science and EngineeringJilin UniversityChangchun130025China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

It has been established that star polymers with a large number of arms display both the conventional chain relaxation and a slower interchain relaxation due to the formation of hard cores,which is called the local structural ***,we demonstrate that this unique relaxation property of multi-arm stars leads to unusual rheological *** study the response of star polymer melts with various arm numbers to start-up shear flow via nonequilibrium molecular dynamics *** simulation results indicate that the stress-strain response of multi-arm star polymer melts differs from that of star polymers with a small number of arms in both quantitative and qualitative *** the multi-arm star polymer melts exhibit an overshoot peak in the stress-strain curve both at relatively small and sufficiently large shear rates,two overshoot peaks appear when the flow strength is comparable to the relaxation time of the star *** double stress overshoot is absent in linear polymers and star polymers with a small number of arms and is evidently related to the presence of the local structural relaxation in star polymers with a large number of *** present a detailed analysis of the conformational and dynamical properties of star polymer melts under start-up shear to gain a molecular understanding of their stress response.

关键词： Simulation Star polymer Start-up shear

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A Bayesian belief-rule-based inference multivariate alarm system for nonlinear time-varying processes

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Science China(Information Sciences) 2021年第10期64卷 194-205页

作者： Xiaobin XU Zhuochen yu Jiusun ZENG Wanqi XIONG Yanzhu HU Guodong wang School of Automation Hangzhou Dianzi University College of Metrology and Measurement Engineering China Jiliang University College of Engineering Peking University School of Automation Beijing University of Posts and Telecommunications Institute of Computer Engineering Vienna University of Technology

This study considers the multivariate alarm design problem of nonlinear time-varying systems by a Bayesian belief-rule-based(BRB) method. In the method, the series of belief rules are constructed to approximate the relationship between input and output variables. Hence, the method does not require an explicit model structure and is suitable for capturing nonlinear causal relationships between *** the purpose of online application, this study further introduces sequential Monte Carlo(SMC) sampling to update the BRB model parameters, which is a fast and efficient method for approximately inferring nonlinear sequence models. Using the model parameters obtained by SMC sampling, the series of output variable tracking errors can be estimated and employed for multivariate alarm design. The case study of a condensate pump verifies the effectiveness of the proposed method.

关键词： multivariate alarm design belief-rule-based method nonlinear time-varying process sequential Monte Carlo

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Investigating the impacts of spatial-temporal variation features of air density on assessing wind power generation and its fluctuation in China

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Science China(Technological Sciences) 2023年第6期66卷 1797-1814页

作者： REN GuoRui wang Wei WAN Jie HONG Feng YANG Ke yu DaRen School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Xi’an Thermal Power Research Institute Co. Ltd.Xi’an 710054China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Air density plays an important role in assessing wind *** density significantly fluctuates both spatially and *** literature typically used standard air density or local annual average air density to assess wind *** present study investigates the estimation errors of the potential and fluctuation of wind resource caused by neglecting the spatial-temporal variation features of air density in *** air density at 100 m height is accurately calculated by using air temperature,pressure,and *** spatial-temporal variation features of air density are firstly *** the wind power generation is modeled based on a 1.5 MW wind turbine model by using the actual air density,standard air densityρst,and local annual average air densityρsite,***ρstoverestimates the annual wind energy production(AEP)in 93.6%of the study *** significantly affects AEP in central and southern China *** more than 75%of the study area,the winter to summer differences in AEP are underestimated,but the intra-day peak-valley differences and fluctuation rate of wind power are ***ρsitesignificantly reduces the estimation error in *** AEP is still overestimated(0-8.6%)in summer and underestimated(0-11.2%)in *** for southwest China,it is hard to reduce the estimation errors of winter to summer differences in AEP by usingρ***ρsitedistinctly reduces the estimation errors of intra-day peak-valley differences and fluctuation rate of wind power,but these estimation errors cannot be ignored as *** impacts of air density on assessing wind resource are almost independent of the wind turbine types.

关键词： air density spatial-temporal variation power curve wind resource assessment fluctuation ERA-5

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Half space object classification via incident angle based fusion of radar and infrared sensors

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Journal of Systems Engineering and Electronics 2022年第5期33卷 1025-1031页

作者： HE Zhenyu ZHUGE Xiaodong wang Junxiang yu Shihao XIE Yongjun ZHAO yuxiong School of Electronic Information and Engineering Beihang UniversityBeijing 100191China Beijing Institute of Electronic System Engineering Beijing 100854China Beijing Institute of Astronautical Systems Engineering Beijing 100076China Shenzhen Institute of Beihang University Shenzhen 518038China School of Software Beihang UniversityBeijing 100191China

In this paper,we introduce an incident angle based fusion method for radar and infrared sensors to improve the recognition rate of complex targets under half space scenarios,e.g.,vehicles on the ground in this *** radar sensors,convolutional operation is introduced into the autoencoder,a“winner-take-all(WTA)”convolutional autoencoder(CAE)is used to improve the recognition rate of the radar high resolution range profile(HRRP).Moreover,different from the free space,the HRRP in half space is more *** order to get closer to the real situation,the half space HRRP is simulated as the *** recognition rate has a growth more than 7%com-pared with the traditional CAE or denoised sparse autoencoder(DsaE).For infrared sensor,a convolutional neural network(CNN)is used for infrared image ***,we com-bine the two results with the Dempster-Shafer(D-S)evidence theory,and the discounting operation is introduced in the fusion to improve the recognition *** recognition rate after fusion has a growth more than 7%compared with a single *** the discounting operation,the accuracy rate has been improved by 1.5%,which validates the effectiveness of the proposed method.

关键词： convolutional autoencoder(CAE) half space high-resolution range profile(HRRP) incident angle based fusion tar-get recognition

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Hot cracking behavior of large size GH4742 superalloy vacuum induction melting ingot

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Journal of Iron and Steel Research International 2022年第9期29卷 1505-1512页

作者： Liang Zhang Lei wang Yang Liu Xiu Song Teng yu Ran Duan Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheasternUniversityShenyang 110819LiaoningChina High Temperature Materials Division Fushun Special Steel Co.Ltd.Fushun 113001LiaoningChina Gaona Aero Material Co. Ltd.Beijing 100081China

The developing of large size superalloy vacuum induction melting(VIM)ingots is limited owing to hot cracking,The hot cracking behavior of the large size GH4742 superalloy VIM ingot was investigated via experiment and *** microstructure was examined by optical microscopy,and element segregation was investigated by electron probe *** solidification temperature range and yield strength at high temperature(YSHT)were calculated by JMatPro *** results show that the variations of microstructure and element segregation in different locations are caused by different cooling ***,the larger secondary dendrite arm spacing and serious element segregation of Nb accelerate hot cracking of the VIM *** addition,the solidification temperature range is wider,and YSHT is lower in center than at edge of the ***,the hot cracking susceptibility is the highest in the center of the GH4742 superalloy VIM *** critical criterion of element segregation for hot cracking is that the partition coeffcient of Nb should be larger than 0.5.

关键词： Hot cracking Large size-Superlloy Vacuum induction melting ingot Element segregation

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Intraocular lens optic capture in pediatric cataract surgery

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International Journal of Ophthalmology(English edition) 2018年第8期11卷 1403-1410页

作者： Ying-Bin Xie Mei-yu Ren Qi wang Li-Hua wang Department of Ophthalmology Shandong Provincial Hospital Affiliated to Shandong University

Posterior capsule opacification（PCO） remains the most common complication of pediatric cataract surgery despite continuous efforts to reduce its incidence. For this reason, pediatric cataract surgeons have expended considerable effort into preventing and mitigating PCO. The intraocular lens（IOL） optic capture technique has been used for the prevention of PCO after pediatric cataract surgery for more than 20 y, but there is still no professional consensus. However, recent research has shown encouraging results. The IOL optic capture technique can be performed without anterior vitrectomy to prevent PCO, even in younger children. The type and characteristics of IOLs used for optic capture technique, the location of IOL and the complications of IOL optic capture in children are here reviewed.

关键词： cataract pediatric lens intraocular surgery

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Harmonic Circulating Current Injection Based Power Loss Optimization Control of Bottom Switch/Diodes for Modular Multilevel Converters

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CSEE Journal of Power and Energy Systems 2021年第6期7卷 1213-1226页

作者： Jifeng Zhao Fujin Deng Chengkai Liu Qiang yu Qingsong wang Jianzhong Zhang School of Electrical Engineering and Jiangsu Key Laboratory of Smart Grid Technology and EquipmentSoutheast UniversityNanjing 210096China

Power loss management is one of the most significant challenges for reliability improvement of modular multilevel converters(MMCs).In the MMC,the bottom switch/diode in each submodule(SM)normally takes the maximum power *** this paper,a power loss optimization control(PLOC)for MMCs is proposed,where the maximum power losses in the bottom switch/diode of each SM can be effectively reduced through injecting optimum second-order harmonic current into the circulating current of MMCs,and accordingly the reliability of MMCs can be improved by the proposed *** results with PSCAD software and experimental results with a 1 kW MMC platform are provided to confirm the validity of the proposed PLOC for MMCs.

关键词： Circulating current injection modular multilevel converters optimization power losses reliability

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Preparation of nitrogen and sulfur co-doped ultrathin graphitic carbon via annealing bagasse lignin as potential electrocatalyst towards oxygen reduction reaction in alkaline and acid media

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Journal of Energy Chemistry 2019年第7期28卷 33-42页

作者： Yixing Shen Feng Peng Yonghai Cao Jianliang Zuo Hongjuan wang Hao yu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou Key Laboratory for New Energy and Green Catalysis School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006GuangdongChina

Renewable lignin used for synthesizing materials has been proven to be highly potential in specific ***,we report a simple method to synthesize nitrogen and sulfur co-doped carbon nanosheets by using bagasse lignin,denoted as lignin-derived carbon(LC).By adjusting the ratio of nitrogen source and annealing temperature,we obtained the ultrathin graphitic lignin carbon(LC-4-1000)with abundant wrinkles with high surface area of 1208 m2g_1 and large pore volume of 1.40 cm3g_*** alkaline medium,LC-4-1000 has more positive half-wave potential and nearly current density compared to commercial Pt/C for oxygen reduction reaction(ORR).More importantly,LC-4-1000 also exhibits comparable activity and superior stability for ORR in acid medium due to its high graphitic N ratio and a direct four electron pathway for *** study develops a cost-effective and highly efficient method to prepare biocarbon catalyst for ORR in fuel cells.

关键词： Electrocatalyst Biocarbon Lignin Nitrogen and sulfur co-doped carbon Oxygen reduction reaction

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Novel Sc-doped Bi_(3)TiNbO_(9) ferroelectric nanofibers prepared by electrospinning for visible-light photocatalysis

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Journal of Rare Earths 2023年第3期41卷 365-373,I0002页

作者： Zhixiong Song Shuwen yu Kaixian wang Zhengming Jiang Liyan Xue Fan Yang Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350002China Xiamen Institute of Rare Earth Materials Haixi InstituteChinese Academy of SciencesXiamen 361021China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Chinese Academy of SciencesXiamen 361021China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341001China

In this work,a novel Sc-doped Bi_(3)TiNbO_(9) ferroelectric nanofiber was first prepared by *** nanofibers are approximately 100 nm level in *** photocatalytic activity analysis reveals that the Bi_(3)TiNbO_(9) nanofibers synthesized by electrospinning are superior to powders prepared by the solid-state method,which is mainly attributed to the high specific surface area and high surface activity of the *** addition,doping Sc can reduce the band gap of Bi_(3)TiNbO_(9) and further improve the photocatalytic ***_(3)TiNbO_(9) nanofibers containing 5 mol%Sc have the highest photocatalytic activity,which can degrade 98.55%of RhB under 405 nm light irradiation for 120 *** addition,the catalytic mechanism of the catalyst was obtained by scavenger tests,active species capture tests and band structure *** three cycles of photocatalytic experiment,the degradation rate is decreased by only 2.42%,proving that the nanofibers catalyst has excellent *** work provides good prospects for the practical application of electrospinning technology in the field of photocatalysis.

关键词： Nanofibers Ferroelectric Scandium Visible-light photocatalysis Rare earths

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