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Eddy covariance measurements of turbulent fluxes in the surf zone

Acta Oceanologica Sinica 2020年第3期39卷 63-72页

作者： Yongfeng Qi Xiaodong Shang Guiying Chen linghui yu State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Turbulent eddies play a critical role in oceanic flows. Direct measurements of turbulent eddy fluxes beneath the sea surface were taken to study the direction of flux-carrying eddies as a means of supplementing our understanding of vertical fluxes exchange processes and their relationship to tides. The observations were made at 32 Hz at a water depth of ~1.5 m near the coast of Sanya, China, using an eddy covariance system, which mainly consists of an acoustic doppler velocimeter(ADV) and a fast temperature sensor. The cospectra-fit method-an established semi-empirical model of boundary layer turbulence to the measured turbulent cospectra at frequencies below those of surface gravity waves-was used in the presence of surface gravity waves to quantify the turbulent eddy fluxes(including turbulent heat flux and Reynolds stress). As much as 87% of the total turbulent stress and 88% of the total turbulent heat flux were determined as being at band frequencies below those of surface gravity waves. Both the turbulent heat flux and Reynolds stress showed a daily successive variation;the former peaked during the low tide period and the later peaked during the ebb tide *** of roll-off wavenumbers, k0, and roll-off wavelengths, λ0(where λ0=2π/k0), which were estimated as the horizontal length scales of the dominant flux-carrying turbulent eddies, indicated that the λ0 of the turbulent heat flux was approximately double that of the Reynolds stress. Wavelet analysis showed that both the turbulent heat flux and the Reynolds stress have a close relationship to the semi-diurnal and diurnal tides, and therefore indicate the energy that is transported from tides to turbulence.

关键词： eddy covariance turbulent fluxes surface gravity waves cospectrum tides

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A comparative study on polypropylene separators coated with different inorganic materials for lithium-ion batteries

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 346-352页

作者： linghui yu Jiansong Miao Yi Jin Jerry Y.S. Lin School for Engineering of Matter Transport and Energy Arizona State University Tempe AZ 85287 USA State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing 100192 China

Coating commercial porous polyolefin separators with inorganic materials can improve the thermal stability of the polyolefin separators and hence improve the safety of lithium-ion batteries. Several different inorganic materials have been studied for the coating. However, there lacks a study on how different the properties of separators, in inorganic materials affect terms of thermal stability and cell performance. Herein, we present such a study on coating a commercial polypropylene separator with four inorganic materials, i.e., Al2O3, SiO2, ZrO2 and zeolite. All inorganic coatings have improved thermal stability of the separators although with differences. The coating layers add 28%-45% of electrical resistance compared with the pure polypropylene separator, but all the cells prepared with the coated polypropylene separators have the same electrical chemical performance as the uncoated separator in terms of rate capability and capacities at different temperatures.

关键词： lithium-ion battery battery safety composite separator porosity tortuosity

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Electrodeposited Sulfur and CoxS Electrocatalyst on Buckypaper as High-Performance Cathode for Li-S Batteries

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Nano-Micro Letters 2020年第10期12卷 263-275页

作者： Yi Zhan Andrea Buffa linghui yu Zhichuan JXu Daniel Mandler School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Chemistry The Hebrew University of Jerusalem9190401 JerusalemIsrael Campus for Research Excellence and Technological Enterprise(CREATE) Singapore-HUJ Alliance for Research and Enterprise(SHARE)Singapore 138602Singapore

Lithium-sulfur batteries(LSBs)are considered as the next generation of advanced rechargeable batteries because of their high energy *** this study,sulfur and CoxS electrocatalyst are deposited on carbon nanotube buckypaper(S/CoxS/BP)by a facile electrodeposition method and are used as a binder-free high-performance cathode for *** sulfur is deposited on buckypaper by electrooxidation of a polysulfide solution(-S6^2-).This approach substantially increased the current and time efficiency of sulfur electrochemical deposition on conductive material for LSBs.S/CoxS/BP cathode could deliver an initial discharge capacity as high as 1650 mAh g^-1 at 0.1 C,which is close to the theoretical capacity of *** current rate of 0.5 C,the S/CoxS/BP has a capacity of 1420 mAh g^-1 at the first cycle and 715 mAh g^-1 after 500 cycles with a fading rate of 0.099%per *** high capacity of S/CoxS/BP is attributed to both the homogeneous dispersion of nanosized sulfur within BP and the presence of CoxS *** sodium dodecyl sulfate(SDS)pretreatment of BP renders it polarity to bind polysulfides and thus facilitates the good dispersibility of nanosized sulfur within *** catalyst accelerates the kinetics of polysulfide conversion and reduces the presence of polysulfide in the cathode,which suppresses the polysulfide diffusion to anode,i.e.,the shuttle *** mitigation of the active material loss improves not only the capacity but also the cyclability of S/CoxS/BP.

关键词： Electrodeposition Lithium sulfur batteries Buckypaper Electrocatalysts

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Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea

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Acta Oceanologica Sinica 2020年第11期39卷 69-81页

作者： Yongfeng Qi Chenjing Shang Huabin Mao Chunhua Qiu Changrong Liang linghui yu Jiancheng yu Xiaodong Shang State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science College of Life Science and OceanographyShenzhen UniversityShenzhen 518060China Ocean College Zhejiang UniversityZhoushan 316021China The Center for Coastal Ocean Science and Technology School of Marine SciencesSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China

Upper turbulent mixing in the interior and surrounding areas of an anticyclonic eddy in the northern South China Sea(SCS)was estimated from underwater glider data(May 2015)in the present study,using the Gregg-HenyeyPolzin parameterization and the Thorpe-scale *** observations revealed a clear asymmetrical spatial pattern of turbulent mixing in the anticyclonic eddy *** diffusivity(in the order of 10–3 m2/s)was found at the posterior edge of the anticyclonic mesoscale eddy;on the anterior side,diffusivity was one order of magnitude lower on *** asymmetrical pattern was highly correlated with the eddy kinetic *** shear variance on the posterior side,which is conducive to the triggering of shear instability,may be the main mechanism for the elevated *** addition,the generation and growth of sub-mesoscale motions that are fed by mesoscale eddies on their posterior side may also promote the occurrence of strong mixing in the studied *** results of this study help improve our knowledge regarding turbulent mixing in the northern SCS.

关键词： mesoscale eddy turbulent mixing South China Sea GHP parameterization Thorpe-scale method

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Effects of catalyst mass loading on electrocatalytic activity:An example of oxygen evolution reaction

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Fundamental Research 2021年第4期1卷 448-452页

作者： linghui yu Shengnan Suna Haiyan Li Zhichuan JXu School of Materials Science and Engineering Nanyang Technological UniversityBlock N4.150 Nanyang Avenue639798Singapore Singapore-HUJ Alliance for Research and Enterprise Campus for Research Excellence and Technological Enterprise(CREATE)NEW-CREATE Phase II138602Singapore Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT) Beijing Key Laboratory for Magnetoelectric Materials and Devices(BKL-MMD)School of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China Energy Research Institute@NTU ERI@NInterdisciplinary Graduate SchoolNanyang Technological University639798Singapore

The evaluation of the intrinsic activity of catalysts is the most basic in searching energy-and cost-efficient catalyst materials for various *** accurate determination of the intrinsic activity is essential for identifying efficient *** a huge number of studies of electrocatalysis for various applications have been reported,the effects of electrode loading on the apparent intrinsic activity obtained experimentally have been rarely *** a high mass loading on the electrode,not all the catalyst surfaces can be electrochemically active because not all the surfaces can be wetted by the *** loading also affects the transport of electrons over the electrode as well as the transport of ions in the electrolyte,and thus affects the *** lead to the derivations of the apparent intrinsic activity from the real intrinsic ***,for better understanding the derivations,we evaluate and discuss the effects of electrode mass loading using oxygen evolution reaction as an example.

关键词： Electrocatalysis Water splitting Oxygen reduction reaction Electrode loading

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Loss of the ubiquitin-conjugating enzyme Rad6B disturbs mitochondrial function and cellular homeostasis in mouse skin

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BIOCELL 2021年第3期45卷 761-772页

作者： linghui yu RONG SHEN YANAN GUO YANXUAN GUO CHEN LI YANFENG SONG DEGUI WANG Department of Anatomy and Histology School of Basic Medical SciencesLanzhou UniversityLanzhou730000China

Various factors can induce cell degeneration by altering the phenotype and metabolism of *** play an essential role in cellular homeostasis and function,rendering aging processes highly associated with mitochondrial function and ***,we describe an aging-prone phenotype of murine skin cells caused by depletion of Rad6B(Ube2b),an E2 ubiquitin-conjugating *** this study,using Masson’s trichrome,we showed that loss of Rad6B causes physiological structure changes in mouse skin with *** addition,a combination of western blotting experiments,transmission electron microscopy and employment of immunofluorescence staining revealed that depletion of Rad6B was characterized by an abnormal mitochondrial metabolic profile,including decreased mitochondrial biosynthesis and mitochondrial complex activities,increased ROS production and suppressed mitophagy resulting in metabolic *** together,these results highlight an important relationship between Rad6B and skin senescence,suggesting that Rad6B plays an indispensable role in maintaining a healthy mitochondrial network and intracellular homeostasis.

关键词： Rad6B Skin Mitochondria Respiratory chain Senescence

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Mg2+-Triggered and pH-Tuned in vitro Assembly of Trehalose-6-Phosphate Synthase

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Wuhan University Journal of Natural Sciences 2018年第5期23卷 396-402页

作者： ZHANG Shanshan YANG Fan ZHANG yuping LIU Zaiman yu linghui CHEN Ximing XIAO Jianxi College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 Gansu China School of Chemical and Biological Engineering Lanzhou Jiaotong University Lanzhou 730070 Gansu China School of Stomatology Lanzhou University Lanzhou 730000 Gansu China Key Laboratory of Desert & Desertification Cold & Arid Regions Environmental & Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 Gansu China

The enzyme Ots A（trehalose-P synthase） plays a critical role in the biosynthesis of trehalose, which is a nonreducing disaccharide that plays important functions in many organisms. By using light scattering technique, we discovered that Ots A in Arthrobacter strain A3 polymerized in the presence of divalent metal ions（Mg2＋ or Ca2＋）, and the kinetics of the assembly was dependent on their concentrations. We identified potential compounds that can affect the kinetics of the polymerization, particularly, heparin, which acts as a very promising inhibitor of the polymerization. The Ots A assembly turns out to be a very delicate process that is finely regulated by p H. Ots A may be in the polymerized form at physiological pH in vivo, suggesting a more complicated mechanism of the enzyme. These unique properties of Ots A provide novel insights into the molecular mechanism of the biosynthesis of trehalose.

关键词： OtsA(trehalose-P synthase) trehalose polymerization light scattering

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敏捷卫星动中成像自主任务规划算法

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宇航学报 2023年第11期44卷 1693-1705页

作者：陈雄姿谢松蔡熙于灵慧杨芳航天东方红卫星有限公司北京100094

针对敏捷卫星动中成像(APBI)自主任务规划所涉及的关键算法进行了研究。首先,基于载荷幅宽和卫星轨道设计了区域目标斜条带拼幅成像垂轨条带划分算法;其次,建立了描述观测点位置与成像时间关系的连续可导的斜条带成像轨迹模型,进而推导... 详细信息

针对敏捷卫星动中成像(APBI)自主任务规划所涉及的关键算法进行了研究。首先,基于载荷幅宽和卫星轨道设计了区域目标斜条带拼幅成像垂轨条带划分算法;其次,建立了描述观测点位置与成像时间关系的连续可导的斜条带成像轨迹模型,进而推导出了敏捷卫星动中成像的三轴姿态规划算法;再次,为了发挥出卫星的最大机动能力,提出了一种基于六阶多项式姿态机动模型的动中成像任务间最短姿态机动时间求解算法;然后,设计了兼顾观测效率与质量的两级任务优化调度算法,包括基于分支定界算法与两种裁剪枝规则的及早观测搜索和观测队列最佳窗口倒序平移,在最大化观测目标数量的基础上将成像质量调整到最优;最后,在星载处理器上进行了仿真实验,仿真结果证明了本文所提算法的正确性和有效性。

关键词：敏捷卫星动中成像自主任务规划姿态机动成像质量

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跨国公司在华投资扩张的时空演化与双重嵌入特征

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地理科学 2023年第5期43卷 869-878页

作者：于灵慧袁丰吴頔吴加伟中国科学院南京地理与湖泊研究所/中国科学院流域地理学重点实验室江苏南京210008 中国科学院大学北京100049 中国科学院大学南京学院江苏南京211135

中国是全球最大的外资流入国之一,解析跨国公司在华(再)投资过程有助于认识外资在东道国本地化扩展的策略和行为。在刻画世界500强企业在华初次投资进入路径和再投资网络扩张的基础上,基于双重嵌入和动态演化视角,构建来源国、东道国和... 详细信息

中国是全球最大的外资流入国之一,解析跨国公司在华(再)投资过程有助于认识外资在东道国本地化扩展的策略和行为。在刻画世界500强企业在华初次投资进入路径和再投资网络扩张的基础上,基于双重嵌入和动态演化视角,构建来源国、东道国和企业自身因素的分析框架,并利用负二项回归模型探讨在华(再)投资的多尺度、多维度、多机制过程。研究表明,不同国别的跨国公司进入中国的路径存在差异,与中国制度等距离较大的北美、西欧国家的跨国公司更倾向于从跳板城市进入中国,而日韩公司更倾向于直接在中国设立分支机构。跨国公司在华再投资呈现双重嵌入特征:一方面,来源国与中国制度距离对跨国公司再投资具有促进作用,但经济等距离的影响不显著;另一方面,再投资行为也受制于在华初次投资区位及中国城市间的网络关系。此外,再投资过程表现出路径依赖和动态演化特征,对投资城市认知和投资行业经验的积累有利于拓展再投资的空间选择范围。

关键词：跨国公司投资网络企业扩张东道国中国

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长江经济带经济韧性空间分异与驱动因素

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地理科学进展 2023年第2期42卷 249-259页

作者：袁丰熊雪蕾徐紫腾于灵慧中国科学院南京地理与湖泊研究所中国科学院流域地理学重点实验室南京210008 河南大学黄河文明与可持续发展研究中心暨黄河文明省部共建协同创新中心河南开封475001 中国科学院大学北京100049

2008年金融危机对中国实体经济造成了巨大冲击,考察危机后区域经济恢复过程的不平衡性和差异化机制,有利于为推动区域高质量和可持续发展提供参考借鉴。论文基于多维韧性测度框架,全面考察国际金融危机后长江经济带经济韧性动态演变过程... 详细信息

2008年金融危机对中国实体经济造成了巨大冲击,考察危机后区域经济恢复过程的不平衡性和差异化机制,有利于为推动区域高质量和可持续发展提供参考借鉴。论文基于多维韧性测度框架,全面考察国际金融危机后长江经济带经济韧性动态演变过程,重点分析了抵抗力、恢复力的时序变化特征和空间分异格局。在此基础上,采用固定效应面板回归模型,重点考察经济结构特征对不同阶段区域经济韧性的影响。研究发现:从总体层面来看,长江经济带遭受冲击后的抵抗力呈先上升后下降的趋势,整体表现为高水平抵抗力,而恢复力呈明显的波动特征;出口韧性的抵抗力和恢复力的波动远大于GDP、工业、消费、就业维度的波动;回归模型表明,多样化和相关多样化、区域创新能力等因素,虽然在危机初期抵御风险的过程中作用有限,但有利于区域在危机过后尽快实现恢复增长。研究有助于探索建立适应中国高质量发展的经济韧性测度框架,可以为推动长江经济带高质量发展提供参考。

关键词：区域经济韧性抵抗力恢复力相关多样化非相关多样化长江经济带

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