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Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures

Acta Oceanologica Sinica 2020年第11期39卷 21-32页

作者： zhehao zheng Wei Zhuang Jianyu Hu Zelun Wu Changjian Liu State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Joint Center for Ocean Remote Sensing University of Delaware-Xiamen UniversityNewarkDE 19716USA South China Sea Marine Survey and Technology Center Ministry of Natural ResourcesGuangzhou 510300China

This study presents a Lagrangian view of upper water exchanges across the Luzon Strait based on the finite-time Lyapunov exponents(FTLE)fields computed from the surface geostrophic *** Lagrangian coherent structures(LCSs)extracted from the FTLE fields well identify the typical flow patterns and eddy activities around the Luzon *** addition,they reveal the intricate transport paths and fluid domains,which are validated by the tracks of satellite-tracked surface drifters and cannot be visually recognized in the velocity *** FTLE fields indicate that there are mainly four types of transport patterns near the Luzon Strait;among them,the Kuroshio northward-flowing"leaping"pattern and the clockwise rotating"looping"pattern occur more frequently than the"leaking"pattern of the direct Kuroshio branch into the SCS and the"outflowing"pattern from the SCS to the *** eddy shedding events of the Kuroshio at the Luzon Strait are further analyzed,and the importance of considering LCSs in estimating transport by eddies is *** anticyclonic eddy(ACE)shedding cases reveal that ACEs mainly originate from the looping paths of Kuroshio and thus could effectively trap the Kuroshio water before eddy *** provide useful information to predict the positions of the upstream waters that finally enter the *** contrast,LCS snapshots indicate that during the formation of cyclonic eddies(CEs),most CEs are not connected with the pathways of Kuroshio ***,the contribution of CEs to the surface water exchanges from the Pacific into the SCS is tiny.

关键词： Lagrangian coherent structures(LCSs) Kuroshio Luzon Strait transport pathways particle tracking

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教学语言对体育教学幼小衔接的促进作用

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当代家庭教育 2021年第14期 179-180页

作者：郑哲浩福建省漳州市实验小学古雷开发区分校

幼小衔接阶段,培养幼儿的语言能力是十分重要的一项任务。这项能力对于每个人而言都不可或缺。在幼儿阶段,他们的主要任务是以娱乐为主,但是到了小学则需要拥有更多的学习时间,这其中也包括体育课程的学习。在这一过渡时期,很多刚刚步... 详细信息

幼小衔接阶段,培养幼儿的语言能力是十分重要的一项任务。这项能力对于每个人而言都不可或缺。在幼儿阶段,他们的主要任务是以娱乐为主,但是到了小学则需要拥有更多的学习时间,这其中也包括体育课程的学习。在这一过渡时期,很多刚刚步入小学的孩子会存在一定的心理落差。在体育教学过程中采用合适的教学语言可以帮助学生更好地度过这个阶段。本文简单阐述了教学语言在幼小衔接中存在的问题及解决对策以及相关的语言教学对体育教学幼小衔接的促进作用,希望能给广大教师工作者一定的启发。

关键词：教学语言体育教学幼小衔接促进

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柱状晶生长取向对定向凝固Mg-Gd合金拉伸和压缩性能的影响

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中国有色金属学报 2024年第8期34卷 2615-2626页

作者：连永强房大然张航林小娉张金玉郑哲浩东北大学材料科学与工程学院沈阳110819 东北大学秦皇岛分校资源与材料学院秦皇岛066004

利用定向凝固技术,制备了生长取向为〈2110〉的柱状多晶Mg-6.3Gd合金和生长取向为〈3214〉的柱状多晶Mg-8.2Gd合金,并研究加载方式(拉伸、压缩)、柱状晶取向与力学性能之间的相关性。结果表明:拉伸载荷下,〈2110〉取向柱状晶的基面〈a... 详细信息

利用定向凝固技术,制备了生长取向为〈2110〉的柱状多晶Mg-6.3Gd合金和生长取向为〈3214〉的柱状多晶Mg-8.2Gd合金,并研究加载方式(拉伸、压缩)、柱状晶取向与力学性能之间的相关性。结果表明:拉伸载荷下,〈2110〉取向柱状晶的基面〈a〉滑移Schmid因子(Fs)低于0.051、柱状晶内启动{1011}压缩孪生协调应变,因此,Mg-6.3Gd合金屈服强度较高(为176 MPa),但伸长率仅8%;〈3214〉取向柱状晶的基面〈a〉滑移Fs高于0.46、柱状晶内启动{1012}拉伸孪生协调应变,因此,Mg-6.3Gd合金屈服强度较低(为57 MPa),但伸长率达到22%。压缩载荷下,两种取向合金启动{1121}和{1012}两种拉伸孪生协调应变,具有较高的形变硬化能力,抗压强度(分别为309 MPa和301 MPa)较屈服强度分别提高214 MPa和219 MPa,且具有较高的塑性。

关键词：镁合金柱状晶取向加载方式拉伸孪生压缩孪生

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微波-超声波协同辅助提取紫苏精油工艺优化及抑菌活性的研究

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中国粮油学报 2022年第1期37卷 115-121,141页

作者：郑哲浩禹宸邱林燕江苏萱吴晓蓉毛晓锐包陈洁韩晓祥修丽丽浙江工商大学应用化学系杭州310018

采用微波-超声波协同方式辅助同时蒸馏萃取法提取紫苏叶中挥发性精油,考察料液比、超声波功率、微波功率、提取时间及提取温度等因素对紫苏精油提取率的影响。在单因素实验的基础上采用响应面分析法优化紫苏精油提取工艺,并利用气相色... 详细信息

采用微波-超声波协同方式辅助同时蒸馏萃取法提取紫苏叶中挥发性精油,考察料液比、超声波功率、微波功率、提取时间及提取温度等因素对紫苏精油提取率的影响。在单因素实验的基础上采用响应面分析法优化紫苏精油提取工艺,并利用气相色谱质谱(GC-MS)分析紫苏精油组成。结果表明:在料液比1∶6,微波功率933 W,超声功率245 W,微波-超声温度50℃,微波-超声时间4.5 min条件下,紫苏精油提取率为2.34%。GC-MS分析表明紫苏精油主要成分为紫苏醛和柠檬烯。抑菌活性研究表明紫苏精油对金黄色葡萄球菌、大肠杆菌和希瓦氏菌都有较强的抑菌活性,MBC都为10μL/mL,可作为天然抑菌保鲜剂使用。

关键词：微波-超声波协同萃取紫苏精油响应面法抑菌活性

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Biomimetic lubricant-grafted surfaces on laser-textured microwell arrays with multifunctionality

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Friction 2024年第12期12卷 2707-2725页

作者： Xiaorui SONG Zhiqiang HOU zhehao GAN Yuyao HU Hongyu zheng Yongling WU Mingming LIU Centre for Advanced Laser Manufacturing(CALM) School of Mechanical EngineeringShandong University of TechnologyZibo 255000China School of Environmental and Material Engineering Yantai UniversityYantai 264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Recently,various slippery liquid-infused porous surfaces(SLIPS)have been fabricated for the protection of various ***,these SLIPSs are limited by their underlying storage structure and superficial lubricant layer,showing poor ***,inspired by the high-strength structure of Shell nacre’s“brick-mud”layer,we fabricated an all-inorganic composite coating by using wet chemically etched MXene as a brick and an aluminum phosphate binder(AP)as ***,a series of microwell-array structures were designed and prepared on the coating via nanosecond ultrafast laser writing ablation ***,the textured surface was modified by a silane coupling ***-terminated polydimethylsiloxane(PDMS)was tightly grafted onto the porous surface through a thiol-ene click reaction to obtain lubricant grafted texture surface(LGTS).The prepared LGTS showed good lubrication properties for multiple phases,including various liquids,ice crystals,and *** exhibits excellent chemical stability and mechanical durability under deionized water impact,centrifugal test,strong acid solutions,anti/de-icing cycles,and high-intensity ***,the proposed strategy for constructing robust LGTS will greatly promote theoretical research on super wetting interfacial materials and their applications in the fields of antifouling,anti/de-icing,and lubricating protection.

关键词： laser texture lubricant covalent grafting omniphobicity anti-icing

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Inherent mass transfer engineering of a Co,N co-doped carbon material towards oxygen reduction reaction

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Journal of Energy Chemistry 2021年第7期30卷 391-396页

作者： Yanzhi Wang Bin Wang Haitao Yuan Zuozhong Liang zhehao Huang Yuye Zhou Wei Zhang Haoquan zheng Rui Cao Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina Department of Materials and Environmental Chemistry Stockholm UniversityStockholm SE-10691Sweden KTH Royal Institute of Technology School of Engineering Sciences in ChemistryBiotechnology and HealthDepartment of ChemistryDivision of Applied Physical ChemistryAnalytical ChemistryStockholm SE-10044Sweden

Oxygen reduction reaction (ORR) is an important process for the conversion and utilization of a wide range of renewable energy sources, and is critical for the shape of future energy scenario [1–10]. However, ORR is a complex four-electron transfer process and is kinetically sluggish. It is urgent to develop high-efficient electrocatalysts to solve this problem [11–15]. Up to now, precious metal-based catalysts such as Pt-based electrocatalysts have been widely studied and found to be one of the most efficient electrocatalysts for ORR. However, the high price and the small reserves limit their large-scale commercialization [10,16–23]. Therefore, in order to fulfill needs for the practical applications, it is necessary to develop low-cost electrocatalysts, also with high activity and great stability [19,24–28].

关键词： Co,N co-doped porous carbon Electrocatalysis Oxygen reduction reaction Zn-air battery

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First-principles analysis of phonon thermal transport properties of two-dimensional WS2/WSe2 heterostructures

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Chinese Physics B 2021年第3期30卷 25-35页

作者： zheng Chang Kunpeng Yuan zhehao Sun Xiaoliang Zhang Yufei Gao Xiaojing Gong Dawei Tang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024China Institute of Materials Science and Engineering National Experimental Demonstration Center for Materials Science and EngineeringChangzhou UniversityChangzhou 213164China

The van der Waals(vdW)heterostructures of bilayer transition metal dichalcogenide obtained by vertically stacking have drawn increasing attention for their enormous potential applications in semiconductors and ***,by using the first-principles calculations and the phonon Boltzmann transport equation(BTE),we studied the phonon transport properties of WS2/WSe2 bilayer heterostructures(WS2/WSe2-BHs).The lattice thermal conductivity of the ideal WS2/WSe2-BHs crystals at room temperature(RT)was 62.98 W/mK,which was clearly lower than the average lattice thermal conductivity of WS2 and WSe2 single *** interesting finding is that the optical branches below 4.73 THz and acoustic branches have powerful coupling,mainly dominating the lattice thermal ***,we also noticed that the phonon mean free path(MFP)of the WS2/WSe2-BHs(233 nm)was remarkably attenuated by the free-standing monolayer WS2(526 nm)and WSe2(1720 nm),leading to a small significant size effect of the WS2/*** results systematically demonstrate the low optical and acoustic phonon modes-dominated phonon thermal transport in heterostructures and give a few important guidelines for the synthesis of van der Waals heterostructures with excellent phonon transport properties.

关键词： WS2/WSe2 bilayer heterostructures thermal transport first-principles Boltzmann transport equation

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First-principles investigation of the significant anisotropy and ultrahigh thermoelectric efficiency of a novel two-dimensional Ga_(2)I_(2)S_(2) at room temperature

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International Journal of Extreme Manufacturing 2022年第2期4卷 100-112页

作者： zheng Chang Ke Liu zhehao Sun Kunpeng Yuan Shuwen Cheng Yufei Gao Xiaoliang Zhang Chen Shen Hongbin Zhang Ning Wang Dawei Tang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024People’s Republic of China Research Office of Propulsion Technology Expace Technology Corporation LimitedBeijing 100176People’s Republic of China Research School of Chemistry Australian National UniversityCanberraACT 2601Australia School of Metallurgy Northeastern UniversityShenyang 100819People’s Republic of China Institut fur Materialwissenschaft Technische Universitat DarmstadtDarmstadt 64283Germany School of Physics University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China

Two-dimensional(2D)thermoelectric(TE)materials have been widely developed;however,some 2D materials exhibit isotropic phonon,electron transport properties,and poor TE performance,which limit their application ***,exploring excellent anisotropic and ultrahigh-performance TE materials are very ***,we first investigate the phonon thermal and TE properties of a novel 2D-connectivity ternary compound named *** paper comprehensively studies the phonon dispersion,phonon anharmonicity,lattice thermal conductivity,electronic structure,carrier mobility,Seebeck coefficient,electrical conductivity,and the dimensionless figure of merit(ZT)versus carrier concentration for 2D Ga_(2)I_(2)S_(2).We conclude that the in-plane lattice thermal conductivities of Ga_(2)I_(2)S_(2) at room temperature(300 K)are found to be 1.55 W mK^(−1) in the X-axis direction(xx-direction)and 3.82 W mK^(−1)in the Y-axis direction(yy-direction),which means its anisotropy ratio reaches ***,the TE performance of p-type and n-type doping 2D Ga2I2S2 also shows significant anisotropy,giving rise to the ZT peak values of p-type doping in xx-and yy-directions being 0.81 and 1.99,respectively,and those of n-type doping reach ultrahigh values of 7.12 and 2.89 at 300 K,which are obviously higher than the reported values for p-type and n-type doping ternary compound Sn2BiX(ZT∼1.70 and∼2.45 at 300 K)(2020 Nano Energy 67104283).This work demonstrates that 2D Ga_(2)I_(2)S_(2) has high anisotropic TE conversion efficiency and can also be used as a new potential room-temperature TE material.

关键词： thermoelectricity strong anisotropy two-dimensional materials room temperature first-principles calculation

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Research on Management Innovation and Development for Railway Passenger Station Construction

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Chinese Railways 2022年第1期 32-37页

作者： WANG zhehao GAN Bojie Construction Management Department China State Railway Group Co.Ltd.

Based on the general high-quality development requirements for railway construction in the new era,combined with the new concept of railway passenger stations of China State Railway Group ***,namely"being well-connected,fully-integrated,environmeni-friendlypassenger-oriented,economically-efficient,culturally-rich,intelligent and convenient"and aiming at the construction of exemplary passenger station projects,this paper summarizes the construction experience in construction,decoration furnishing culture and art expression of railway passenger stations,proposes the working patterns of formulating the implementation plans of exemplary railway passenger station projects and the expert reviews in innovative way studies and forms 6 special-subject designs such as for colorshape,space,environment,art and culture,as wellas the specific design requirements for 13 key areas including waiting hall entrance and exit corridor;VIP room,etc.,and summarizes and puts forward the construction management system of railway passenger stations in the new era,so as to ensure the expected exemplary project quality of railway passenger stations.

关键词： high-quality development railway passenger station exemplary project new concept culture and art

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用于列车地板结构减振的动力吸振器设计

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噪声与振动控制 2023年第2期43卷 265-271页

作者：李哲豪郑辉中铁第一勘察设计院集团有限公司西安710043

动力吸振器作为一种振动控制的主要手段,很少被用于铁道车辆车体结构的振动控制。通过仿真分析发现车辆在33.6 Hz处存在地板局部振动放大现象。为解决该问题,建立地板-多重动力吸振器系统运动方程,推导得到动力放大系数函数,并提出一种... 详细信息

动力吸振器作为一种振动控制的主要手段,很少被用于铁道车辆车体结构的振动控制。通过仿真分析发现车辆在33.6 Hz处存在地板局部振动放大现象。为解决该问题,建立地板-多重动力吸振器系统运动方程,推导得到动力放大系数函数,并提出一种基于偏导数的数值搜索方法,计算多重动力吸振器的最优参数。利用仿真方法提取地板目标模态的振型函数,并计算模态质量,最终得到地板最优多重动力吸振器参数。将动力吸振器建入车体仿真模型对其振动控制效果进行验证。结果表明,目标频率33.6 Hz处的地板振动加速度峰值下降23.98%,且33.6 Hz附近的振动传递率也有所下降,所设计的地板多重动力吸振器具有良好的减振效果。

关键词：振动与波地板振动控制多重动力吸振器动力放大系数

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