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Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River

Journal of Oceanology and Limnology 2020年第4期38卷 1138-1152页

作者： WANG Jianfeng YU fei ren Qiang WEI Chuanjie CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

Based on field hydrological,microstructural,and shipboard Acoustic Doppler Current Profiler data,we quantified the spatial and temporal variability of turbulent mixing in the near-field Changjiang(Yangtze)River *** surface dissipation rate(ε)changed by three orders of magnitude from near-field(10^-4 W/kg)to far-field(10^-7 W/kg)plumes,indicating a decrease with distance from the river *** the river plume,εchanged with depth to 10^-8 W/kg,and increased to 10^-6 W/kg at the layer where the Taiwan Warm Current(TWC)***,εin the near-field plume showed three layers:surface layer in the river plume,middle layer,and lower TWC *** the river plume,the strongestεand turbulent diffusivity(Kz)were greater than 10^-4 W/kg and 10^-2 m^2/s,respectively,during strong ebb tides.A three-orders-of-magnitude change inεand Kz was observed in the tidal *** depth of the halocline changed with tidal cycles,and stratification(N 2)varied by one order of *** in the TWC layer followed the distribution of the halocline,which is opposite to the dissipation *** currents led to intrusion and turbulent mixing in the TWC *** ebb tides,εand Kz were as strong as those measured in the river plume,but did not last as *** structure of the velocity shear was similar to the dissipation rate in both the river plume and TWC layer,whereas the velocity shear in the TWC layer did not match the stratification *** the high dissipation rate area,the gradient Richardson number was smaller than the critical value(Ri grent.

关键词： Changjiang River near-field plume turbulent mixing observation microstructure

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Universal cooling patterns of the butterfly wing scales hierarchy deduced from the heterogeneous thermal and structural properties of Tirumala limniace(Lepidoptera:Nymphalidae,Danainae)

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Insect Science 2022年第6期29卷 1761-1772页

作者： Chu-fei Tang fan-fan Li Ye Cao Huai-Jian Liao Institute of Leisure Agriculture Jiangsu Academy of Agricultural SciencesNanjingChina Key Laboratory of Urban Agriculture Ministry of Agriculture and Rural AffairsShanghaiChina

The radiative cooling of butterfly wing scales hierarchy has great value in understanding how poikilotherms adapt to the environment and developing bionic ***,it remains unclear what the cooling system is like and how the vari-ation of hierarchy affects the cooling ***,the correlation between the variations of the structure and emissivity of scale hierarchy is thoroughly investigated in Tirumala limniace(Cramer,1775),whose thermal properties are highly heteroge-neous among different wings and regions but similar between males and ***-terns were deduced from the biological and model simulation *** scale hierarchy varies at the micro-to nanolevel on both surface and section,correspond-ing to the variating *** on wing veins and margins have large nanostruc-tured units with small lumens and are distinctly thickened,which bring extraordinarily high *** variations of light and dark scales,respectively,lead to the high emissivity of the middle region of wings and the front ***,the elevation of the inner surface area and the thickness of the chitin is the key to enhancing the cooling *** the first time,the effects of the variation of hierarchy toward emissivity of the mid-infrared spectrum are systematically *** is demonstrated that wing scales integrally differentiate in coping with the heterogeneous cooling needs,which may benefit in balancing multifunctions and the development toward the adap-tation to the abiotic *** study provides insights into the comprehensive thermoregulation system of butterflies and the further development of radiative cooling materials.

关键词： butterfly emissivity heterogeneous hierarchy radiative cooling wing scales

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An assessment of surrogate fuel using Bayesian multiple kernel learning model in sight of sooting tendency

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Frontiers in Energy 2022年第2期16卷 277-291页

作者： Lei ZHU Zhan GAO Xiaogang CHENG fei ren Zhen HUANG Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200030China

An integrated and systematic database of sooting tendency with more than 190 kinds of fuels was obtained through a series of experimental investigations. The laser-induced incandescence (LII) method was used to acquire the 2D distribution of soot volume fraction, and an apparatus-independent yield sooting index (YSI) was experimentally obtained. Based on the database, a novel predicting model of YSI values for surrogate fuels was proposed with the application of a machine learning method, named the Bayesian multiple kernel learning (BMKL) model. A high correlation coefficient (0.986) between measured YSIs and predicted values with the BMKL model was obtained, indicating that the BMKL model had a reliable and accurate predictive capacity for YSI values of surrogate fuels. The BMKL model provides an accurate and low-cost approach to assess surrogate performances of diesel, jet fuel, and biodiesel in terms of sooting tendency. Particularly, this model is one of the first attempts to predict the sooting tendencies of surrogate fuels that concurrently contain hydrocarbon and oxygenated components and shows a satisfying matching level. During surrogate formulation, the BMKL model can be used to shrink the surrogate candidate list in terms of sooting tendency and ensure the optimal surrogate has a satisfying matching level of soot behaviors. Due to the high accuracy and resolution of YSI prediction, the BMKL model is also capable of providing distinguishing information of sooting tendency for surrogate design.

关键词： sooting tendency yield sooting index Bayesian multiple kernel learning surrogate assessment surrogate formulation

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Cooperative transport strategy for formation control of multiple mobile robots

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第12期11卷 931-938页

作者： fan YANG Shi-rong LIU fei LIU Institute of Automation East China University of Science and Technology Shanghai 200237 China Institute of Automation Hangzhou Dianzi University Hangzhou 310018 China

This paper addresses a box transport problem that requires the cooperation of multiple mobile robots. A geometric-based distributed formation control strategy is proposed for robots to push the box to the target, which might be static or dynamic. Velocity and hardware constraints are considered in the advanced planning of the trajectory. Information sharing is included because the robots used as box pushers cannot acquire the required environmental information from their local sensors. Simulation results show the effectiveness of the proposed distributed cooperation strategy.

关键词： Multiple mobile robots Cooperative transport Formation control Information sharing Box transport

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Consideration on aircraft tire spray when running on wet runways

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Chinese Journal of Aeronautics 2020年第2期33卷 520-528页

作者： Xianpeng ZHANG fei XU Xuanqi ren Xiangyang GAO rengang CAO School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Commercial Aircraft Corporation of China Ltd.Shanghai 200126China

The tire spray produced by aircraft running on wet runways may enter the intake of engines,which may lead to the compressor stall,surge,or even combustion ***,it is necessary to do some research work on the tire spray to help to solve this ***,the mechanism of tire spray is analyzed,and some parameters are defined to describe the spray ***,the numerical model of tire spray is established by coupled Smoothed Particle Hydrodynamics(SPH)and Finite Element Method(FEM)in LS-DYNA software,and the model is validated by a simplified water spray *** some influence factors on the spray pattern are studied by numerical ***,some suggestions are proposed on different types of aircraft to avoid too much tire spray being ingested into the engine intakes.

关键词： Aircraft tires Engine ingestion SPH Spray pattern Wet runway

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Promoting effect of super absorbent polymer on hydrate formation

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Journal of Natural Gas Chemistry 2010年第3期19卷 251-254页

作者： fei Long Shuanshi fan Yanhong Wang Xuemei Lang The Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of Education School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China

The effect of super absorbent polymer（SAP） on the formation of tetrahydrofuran（THF） hydrate was studied by the successional cooling *** was found that THF solution samples with 0.004 wt% and 0.03 wt% of SAP formed THF hydrate completely during the same cooling *** corresponding induction time was 16-29 min,14-31 min,respectively,which was obviously shorter than that of THF solution samples without SAP（25-62 min）.It indicated that SAP accelerated the formation of THF *** the same time,the pictures of hydrate formation with and without SAP had been *** was found that SAP did not change the morphology of the ***,the mechanism of SAP promoting effect on the formation of THF hydrate was suggested.

关键词： super absorbent polymer tetrahydrofuran hydrate promoting effect

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Subtropical Air-Sea Interaction and Development of Central Pacific El Nio

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Journal of Ocean University of China 2013年第2期12卷 260-271页

作者： XIE Ruihuang HUANG fei ren Hongli Department of Marine Meteorology Physical Oceanography Laboratory and Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of ShandongOcean University of China Department of Meteorology School of Ocean and Earth Science and TechnologyUniversity of Hawaii Laboratory for Climate Studies National Climate CenterChina Meteorological Administration

The standard deviation of the central Pacific sea surface temperature anomaly （SSTA） during the period from October to February shows that the central Pacific SSTA variation is primarily due to the occurrence of the Central Pacific E1 Nifio （CP-E1 Nifio） and has a connection with the subtropical air-sea interaction in the northeastern Pacific. After removing the influence of the Eastern Pacific E1 Nifio, an S-EOF analysis is conducted and the leading mode shows a clear seasonal SSTA evolving from the subtropical northeastern Pacific to the tropical central Pacific with a quasi-biennial period. The initial subtropical SSTA is generated by the wind speed decrease and surface heat flux increase due to a north Pacific anomalous cyclone. Such subtropical SSTA can further influence the establishment of the SSTA in the tropical central Pacific via the wind-evaporation-SST （WES） feedback. After established, the central equatorial Pacific SSTA can be strengthened by the zonal advective feedback and thermocline feedback, and develop into CP-E1 Nifio. However, as the thermocline feedback increases the SSTA cooling after the mature phase, the heat flux loss and the reversed zonal advective feedback can cause the phase transition of CP-EI Nifio. Along with the wind stress variability, the recharge （discharge） process occurs in the central （eastern） equatorial Pacific and such a process causes the phase consistency between the thermocline depth and SST anomalies, which presents a contrast to the original recharge/discharge theory.

关键词： CP-E1 Nifio subtropical forcing recharge/discharge process phase consistency thermocline depth

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Nonparametrie Quantile Inference for Cause-specific Residual Life Function Under Length-biased Sampling

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Acta Mathematicae Applicatae Sinica 2020年第4期36卷 902-916页

作者： fei-Peng ZHANG Cai-Yun fan Yong ZHOU School of Economics and Finance Xi'an Jiaotong UniversityXi'an 710049China School of Statistics and Information Shanghai University of International Business and EconomicsShanghai 201620China Key Laboratory of Advanced Theory and Application in Statistics and Data Science MOE&Academy of Statistics and Interdisciplinary SciencesEast China Normal UniversityShanghai 200062China

This paper considers a competing risks model for right-censored and length-biased survival data from prevalent *** propose a nonparametric quantile inference procedure for cause-specific residual life distribution with competing risks *** also derive the asymptotic properties of the proposed estimators of this quantile *** studies and the unemployment data demonstrate the practical utility of the methodology.

关键词： Length-biased data competing risks quantile residual life estimating equation

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基于碳排放核算范围视角下城市社区实现绿色繁荣的规划策略行动

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国土与自然资源研究 2025年第1期 55-59页

作者：费凡肖越李晓晖广州市城市规划勘测设计研究院广州510060 广州市资源规划和海洋科技协同创新中心广州510060 广东省城市感知与监测预警企业重点实验室广州510060

社区作为现代城市管理和社会生活的重要基础单元,是碳排放的重点也是低碳发展的重要载体。在梳理“绿色繁荣”社区的目标与内涵基础上,结合相关技术标准与理论实践,以碳排放核算的视角进行切入,将国际碳排放核算标准中的“范围”概念应... 详细信息

社区作为现代城市管理和社会生活的重要基础单元,是碳排放的重点也是低碳发展的重要载体。在梳理“绿色繁荣”社区的目标与内涵基础上,结合相关技术标准与理论实践,以碳排放核算的视角进行切入,将国际碳排放核算标准中的“范围”概念应用到社区层面,建立社区碳排放的范围分类,识别社区减碳的关键维度,并提出实现绿色繁荣社区的规划设计策略与具体行动,研究结果可为城市、区域乃至国家实现低碳高质量发展目标提供经验借鉴。

关键词：碳排放核算绿色繁荣低碳社区碳排放范围规划策略

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Three-Dimensional Discrete Observability Analysis for Air-to-Air Missile Target Tracking

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Journal of Beijing Institute of Technology 2017年第4期26卷 548-556页

作者： fei Liu Zhang ren Yuan Liang School of Autonomous Science and Electrical Engineering Beihang University Department of General Aviation Civil Aviation Management Institute of China

The interception information of infrared（ IR）-guided air-to-air missiles（ AAM） is mainly estimated only using the basic bearing measurements. In order to intercept highly maneuverable targets,it is essential to study the system observability to improve the target tracking system *** uniqueness of this paper is that the observability analysis is derived based on a discrete three-dimensional （3D） system model. During the maneuvering scenario,the system is approximated by a segment-by-segment system. The relationship between missile-target motion and observability is given by direct and dual approaches. Meanwhile sufficient observability conditions are derived. Moreover,a numerical simulation is conducted and an alternate method is provided to reinforce the proposed observability analysis results.

关键词： air-to-air missile (AAM) 3D discrete system target tracking observability analysis

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