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Fast processing of foreign fiber images by image blocking

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Information Processing in Agriculture 2014年第1期1卷 2-13页

作者： yutao wu Daoliang Li Zhenbo Li Wenzhu Yang Beijing Engineering&Technology Research Center for Internet of Things in Agriculture China-EU Center for Information and Communication Technologies in Agriculture of China Agriculture UniversityBeijing100083PR China Key Lab of Machine Learning and Computational Intelligence College of Mathematics and Computer ScienceHebei UniversityBaoding071002PR China

In the textile industry,it is always the case that cotton products are constitutive of many types of foreign fibers which affect the overall quality of cotton *** the foundation of the foreign fiber automated inspection,image process exerts a critical impact on the process of foreign fiber *** paper presents a new approach for the fast processing of foreign fiber *** approach includes five main steps,image block,image predecision,image background extraction,image enhancement and segmentation,and image *** first,the captured color images were transformed into gray-scale images;followed by the inversion of gray-scale of the transformed images;then the whole image was divided into several ***,the subsequent step is to judge which image block contains the target foreign fiber image through image *** we segment the image block via OSTU which possibly contains target images after background eradication and image ***,we connect those relevant segmented image blocks to get an intact and clear foreign fiber target *** experimental result shows that this method of segmentation has the advantage of accuracy and speed over the other segmentation *** the other hand,this method also connects the target image that produce fractures therefore getting an intact and clear foreign fiber target image.

关键词： Cotton Foreign fibers Fast image processing Image block Image pre-decision Image connection

Neural Modified Extended State Observer for Autonomous Maritime Transportation Vehicles with Actuator Faults and Unmatched Nonlinearities

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Guidance, Navigation and Control 2024年第1期4卷 41-61页

作者： yutao wu Zehui Mao Bin Jiang College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R.China

This paper investigates extended state observer design problem for autonomous maritime transportation vehicles consisting of multiple unmanned aerial vehicles(UAVs)and unmanned surface vehicles(USVs)via the cooperation–competition *** two coordinate transformations,the dynamic model of UAVs and USVs is transformed into a standard secondorder heterogeneous multi-agent system in unified earth-fixed *** order to recover the unavailable velocities,unpredictable fault,total disturbance as well as to estimate the heterogeneous match/unmatched nonlinearities,neural network(NN)is incorporated into the design process of the modified distributed extended state observer(MESO).Based on the Lyapunov stability analysis,it is proved that all the error signals are uniformly ultimately bounded(UUB)and the bounds could be arbitrarily small by choosing appropriate *** results verify the effectiveness of the proposed method.

关键词： UAVs-USVs neural network extended state observer signed graph

An updated view on the differentiation of stem cells into endothelial cells

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Science China(Life Sciences) 2014年第8期57卷 763-773页

作者： ZHOU YiJiang YANG Feng CHEN Ting wu yutao YANG Mei ZHU JianHua ZHANG Li Department of Cardiology the First Affiliated Hospital of Zhejiang UniversitySchool of Medicine

Endothelial cells form the internal barrier between circulating blood and the vessel *** regulate arterial activity and mediate pathological reactions to vascular injuries such as atherosclerosis and balloon *** development and differentiation of endothelial cells is a complex and coordinated process involving multiple levels of signaling and transcriptional and post-transcriptional *** the mechanism of endothelial differentiation will not only enhance our understanding of vascular disease pathogenesis,but also facilitate our ability to produce vessels cells from pluripotent stem cells for regeneration *** this review,we discuss the current understanding of how stem cells differentiate into endothelial cells at the level of signaling,transcription and microRNA regulation.

关键词： stem cells endothelial cells differentiation signaling transcription microRNA

Macroporous 3D MXene architecture for solar-driven interfacial water evaporation

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Journal of Advanced Dielectrics 2019年第6期9卷 36-41页

作者： Maomao Ju Yawei Yang Jianqiu Zhao Xingtian Yin yutao wu Wenxiu Que Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049P.R.China Shaanxi Engineering Research Center of Advanced Energy Materials and Devices School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049P.R.China Hangzhou Joy Energy Technology Co.Ltd.83 Hongken Road Xiaoshan Economic Development Zone Hangzhou Zhejiang 311200P.R.China

Interfacial water evaporation through solar heating with photothermal materials is a promising strategy for seawater desalination and wastewater *** packed 2D membranes with high reflection losses and limited vapor escape channels result in a low evaporation *** this work,3D MXene architecture was fabricated by dropping the delaminated Ti_(3)C_(2)(d-Ti_(3)C_(2))nanosheets onto the carbonized melamine foam(CMF)*** to the macroporous 3D architecture,more effective broadband solar absorption and vapor escaping were *** a result,the 3D CMF@d-Ti_(3)C_(2)-based evaporator delivers a water evaporation rate of 1.60 kg/m2·h with a solar-to-vapor conversion efficiency of up to 84.6%.

关键词： 3D Ti_(3)C_(2) carbonized melamine foam solar vapor generation

Optimal Apparoch for Replacement Intervals of Warm Standby System

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Journal of Donghua University(English Edition) 2018年第1期35卷 82-85页

作者： YU Xinfeng wu yutao QIU Hualei WEN Liang China Satellite Maritime Tracking and Controlling Department Jiangyin 214413China 65185 Unit of PLA Tieling 112611China Department of Management Engineering Mechanical Engineering CollegeShijiazhuang 050003China

The protection device with low price and high maintenance cost can be used for a long *** order to improve availability of protection system,a method of increasing redundancy and periodic replacement is ***,the equivalent model of cumulative failure probability was ***,the wasting time of the spare part is converted into the working time of the using *** the optimization objective,under the strategy of block replacement,the availability model in infinite period with the maximum availability and the cost model in finite period with the minimum cost are established *** this case,we seek out the optimum replacement interval and verify the applicability and validity of the model through contrast and ***,the paper gives a brief discussion of future research area about warm standby system maintenance.

关键词： mathematical model warm standby system block replacement preventive maintenance

Efficient and cost-effective method to synthesize highly purified Ti_(4)AlN_(3) and Ti_(2)AlN

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Journal of Advanced Dielectrics 2019年第1期9卷 55-58页

作者： Muhammad Faraz Ud Din Chenhui Yang Yi Tang* Yapeng Tian Yangyang Luo yutao wu Wenxiu Que Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research and Shaanxi Engineering Research Center of Advanced Energy Materials and Devices School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049P.R.China Hangzhou Joy Energy Technology Ltd Co. 83 Hongken Road Xiaoshan Economic Development Zone Hangzhou 311200ZhejiangP.R.China

Nitrides MAX have attracted ever-growing interest owing to its unique metallic and ceramic characteristics and ***,we report on the synthesis of highly purified Ti_(2)AlN and Ti_(4)AlN_(3) powders from Ti,Al and TiN powders by a facile atmosphere sintering *** obtained nitrides show highly pure phase and excellent layered *** for the composition difference of raw materials,both the nitrides can be sintered and obtained by same sintering temperature and holding time,which thus makes less processing time and less usage of synthesis parameters as compared to previously synthesis *** our knowledge,present work is one of the few reports on synthesis of Ti_(4)AlN_(3) and Ti_(2)AlN using atmosphere sintering ***,the lattice changes of the layered structure of Ti_(2)AlX(X/C=N)were studied by changing the composition of X position from the synthesis of Ti_(2)AlCN and Ti_(2)AlC,and the optimal formulation and synthesis mechanism of Ti_(4)AlN_(3) were also studied.

关键词： Ti_(4)AlN_(3) Ti_(2)AlN atmosphere sintering method nitrides MAX

Operating speed models for curved segments of highways in plateau regions

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Journal of Southeast University(English Edition) 2022年第1期38卷 85-91页

作者： Wang Chenzhu Chen Fei Xu Wensheng wu yutao Zhang Yunlong Bo wu Zhang Ping School of Transportation Southeast UniversityNanjing 211189China National Experimental Teaching Demonstration Center of Road Traffic Engineering Southeast UniversityNanjing 211189China China Harbour Engineering Co. Ltd.Beijing 100027China Zachry Department of Civil Environmental Engineering Texas A&M University 3136 TAMUCollege StationUSA School of Engineering Tibet UniversityLasa 850000China

To examine the influence of the harsh environment in plateau areas on the operating speed of vehicles,advanced speed prediction models for curved segments are established based on observed actual speed ***,the speed characteristics at the starting,mid,and end points of a plane curve were observed on Lalin Highway and China National Highway 318 with Bushnell s handheld radar speedometer ***,the stepwise regression method was proposed to determine the significant parameters and propose the prediction models of the operating speed of cars and large vehicles for the two ***,reserved test group data were utilized to prove the validity and practicality of the proposed *** with traditional methods,the established models can produce more accurate prediction results and deeply examine the nonlinear relationships between parameters and the predicted operating *** study provides a considerate direction and basis for the operating speed prediction model for other segments in plateau regions.

关键词： plateau areas operating speed stepwise regression method prediction model

碳等离子体诱导柔性PET薄膜表面原位生长非晶碳薄膜

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中国表面工程 2023年第1期36卷 168-178页

作者：李玥王永欣王莹吴于涛中国科学院宁波材料技术与工程研究所海洋新材料与应用技术重点实验室宁波315201 常州大学江苏省光伏科学与工程协同创新中心常州213164

等离子体改性由于效果持久、环境友好而备受关注,其中碳等离子体改性不仅具有轰击效应,同时还具有沉积效应,然而碳等离子体对柔性聚对苯二甲酸乙二醇酯(PET)薄膜改性研究较少.柔性PET薄膜在使用过程中常因磨损和降解等原因,其光学透过... 详细信息

等离子体改性由于效果持久、环境友好而备受关注,其中碳等离子体改性不仅具有轰击效应,同时还具有沉积效应,然而碳等离子体对柔性聚对苯二甲酸乙二醇酯(PET)薄膜改性研究较少.柔性PET薄膜在使用过程中常因磨损和降解等原因,其光学透过性能以及力学性能受到影响.研究不同碳等离子体轰击电流(0.5A、1.0A、1.5A、2.0A)对柔性PET薄膜结构及性能的影响.通过FTIR、Raman光谱、双光束扫描电子显微镜(FIB-SEM)、扫描探针显微镜(SPM)、接触角测量仪、UV-Vis、氙灯老化试验箱、多功能摩擦磨损试验机等分析手段对薄膜的表截面结构、润湿性能、透光性、耐老化性、耐磨防护性及柔性的变化进行表征,并分析其生长机理.结果表明:低电流(0.5 A)下碳等离子体主要起到轰击效应,使得PET薄膜表面有机碳质结构发生断裂重排,样品透光率与基底相比仅下降0.439%,同时该电流下制得的样品具有疏水性、耐老化性及韧性.而高电流下制得的样品的硬度显著提升,具有良好的耐磨性能,表面薄膜在弯曲过程中因应力的释放出现裂纹,但薄膜并未剥落.非晶碳薄膜与柔性PET薄膜具有良好结合力.通过碳等离子体诱导法生长的非晶碳薄膜可以有效延缓柔性PET薄膜在使用过程中的降解并提高其力学性能.

关键词：柔性PET薄膜碳等离子体原位生长

污染源位置对圆柱形水工建筑下游污染物浓度分布的影响

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水利水电科技进展 2017年第3期37卷 49-54页

作者：武玉涛任华堂夏建新中央民族大学生命与环境科学学院北京100081

利用雷诺方程和RNG k-ε紊流模型,对排放源在圆柱形水工建筑上游和下游两种工况下的尾流浓度场进行数值模拟,从污染物时均浓度、浓度脉动强度和浓度半宽度3个方面比较了污染源位置对圆柱形水工建筑下游污染物浓度分布特性的影响。结果表... 详细信息

利用雷诺方程和RNG k-ε紊流模型,对排放源在圆柱形水工建筑上游和下游两种工况下的尾流浓度场进行数值模拟,从污染物时均浓度、浓度脉动强度和浓度半宽度3个方面比较了污染源位置对圆柱形水工建筑下游污染物浓度分布特性的影响。结果表明:随流程的增大,两种工况下污染物时均浓度横向断面分布先后经历双峰结构、过渡阶段和高斯分布3个阶段;排放源在上游时,浓度脉动强度先增大后减小;排放源在下游时,浓度脉动强度一直减小;两种工况的浓度半宽度变化规律一致,当1≤x/D<15时浓度半宽度呈非线性增长,当15≤x/D≤30时呈线性增长。

关键词：圆柱绕流雷诺方程数值模拟浓度分布尾流