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Theoretical & Applied Mechanics Letters 2024年第1期14卷 27-34页

作者： zilan Zhang Yu Ao Shaofan li Grace X.Gu Department of Mechanical Engineering University of CaliforniaBerkeley 94720USA Department of Engineering Peking UniversityBeijing 100871China Department of Civil and Environmental Engineering University of CaliforniaBerkeley 94720USA

Conventional wing aerodynamic optimization processes can be time-consuming and imprecise due to the complexity of versatile flight missions.Plenty of existing literature has considered two-dimensional infinite airfoil optimization,while three-dimensional finite wing optimizations are subject to limited study because of high computational costs.Here we create an adaptive optimization methodology built upon digitized wing shape deformation and deep learning algorithms,which enable the rapid formulation of finite wing designs for specific aerodynamic performance demands under different cruise conditions.This methodology unfolds in three stages:radial basis function interpolated wing generation,collection of inputs from computational fluid dynamics simulations,and deep neural network that constructs the surrogate model for the optimal wing configuration.It has been demonstrated that the proposed methodology can significantly reduce the computational cost of numerical simulations.It also has the potential to optimize various aerial vehicles undergoing different mission environments,loading conditions,and safety requirements.

关键词： Aerodynamic optimization Computational fluid dynamics Radial basis function Finite wing Deep learning neural network

Controlled growth of vertically stacked In_(2)Se_(3)/WSe_(2) heterostructures for ultrahigh responsivity photodetector

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Nano Research 2024年第3期17卷 1856-1863页

作者： Cheng Zhang Biyuan Zheng Guangcheng Wu Xueying liu Jiaxin Wu Chengdong Yao Yizhe Wang zilan Tang Ying Chen lizhen Fang Luying Huang Dong li Shengman li Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Materials Science and EngineeringHunan UniversityChangsha 410082China

Transition metal dichalcogenides(TMDCs)are promising candidates for future optoelectronic devices accounting for their high carrier mobility and excellent quantum efficiency.However,the limited light absorption efficiency in atomically thin layers significantly hinders photocarrier generation,thereby impairing the optoelectronic performance and hindering practical applications.Herein,we successfully synthesized In_(2)Se_(3)/WSe_(2) heterostructures through a typical two-step chemical vapor deposition(CVD)method.The In_(2)Se_(3) nanosheet with strong light absorption capability,serving as the light absorption layer,was integrated with the monolayer WSe_(2),enhancing the photosensitivity of WSe_(2) significantly.Upon laser irradiation with a wavelength of 520 nm,the In_(2)Se_(3)/WSe_(2) heterostructure device shows an ultrahigh photoresponsivity with a value as high as 2333.5 A/W and a remarkable detectivity reaching up to 6.7×10^(12) Jones,which is the highest among almost the reported TMDCs-based heterostructures grown via CVD even some fabricated by mechanical exfoliation(ME).Combing the advantages of CVD method such as large scale,high yield,and clean interface,the In_(2)Se_(3)/WSe_(2) heterostructures would provide a novel path for future high-performance optoelectronic device.

关键词： transition metal dichalcogenides(TMDCs) In_(2)Se_(3) heterostructure photodetector ultrahigh responsivity

On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

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Plasma Science and Technology 2024年第4期26卷 101-113页

作者：陈星宇李孟琦王威逸张权治彭涛熊紫兰 State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

The discharge morphology of pulsed dielectric barrier discharge(PDBD) plays important roles in its applications. Here, we systematically investigated the effects of the voltage amplitude,discharge gap, and O_(2)content on the PDBD morphology, and revealed the possible underlying mechanism of the U-shaped formation. First, the morphological evolution under different conditions was recorded. A unique U-shaped region appears in the middle edge region when the gap is larger than 2 mm, while the entire discharge region remains columnar under a 2 mm gap in He PDBD. The width of the discharge and the U-shaped region increase with the increase in voltage, and decrease with the increase of the gap and O_(2)content. To explain this phenomenon,a two-dimensional symmetric model was developed to simulate the spatiotemporal evolution of different species and calculate the electric thrust. The discharge morphology evolution directly corresponds to the excited-state atomic reduction process. The electric thrust on the charged particles mainly determines the reaction region and strongly influences the U-shaped formation.When the gap is less than 2 mm, the electric thrust is homogeneous throughout the entire region,resulting in a columnar shape. However, when the gap is larger than 2 mm or O_(2)is added, the electric thrust in the edge region becomes greater than that in the middle, leading to the U-shaped formation. Furthermore, in He PDBD, the charged particles generating electric thrust are mainly electrons and helium ions, while in He/O_(2)PDBD those that generate electric thrust at the outer edge of the electrode surface are mainly various oxygen-containing ions.

关键词： low-temperature plasma dielectric barrier discharge discharge morphology particle distribution electric thrust

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双面叠合装配式管廊侧墙面外抗震性能试验

同济大学学报（自然科学版） 2024年第2期52卷 203-212页

作者：赵密石少华李广帆程小卫钟紫蓝北京工业大学城市建设学部北京100124

为研究采用螺旋箍筋套筒底节点连接的预制双面叠合式管廊侧墙在面外荷载作用下的受力变形性能,对2个采用该节点连接的足尺侧墙试件进行了不同轴压比下低周往复加载试验,并与对应2个现浇试件作对比,初步揭示了螺旋箍筋套筒底节点和竖向... 详细信息

为研究采用螺旋箍筋套筒底节点连接的预制双面叠合式管廊侧墙在面外荷载作用下的受力变形性能,对2个采用该节点连接的足尺侧墙试件进行了不同轴压比下低周往复加载试验,并与对应2个现浇试件作对比,初步揭示了螺旋箍筋套筒底节点和竖向轴压比对管廊侧墙面外抗震受力变形性能的影响。试验结果表明:两种试件滞回曲线均较为饱满,具有良好的抗震耗能能力,满足装配式结构抗震变形设计要求;叠合装配试件上部区域剪切变形均高于现浇试件,且裂缝遍布整个墙体高度范围,具有良好的面外变形能力。

关键词：双面叠合侧墙综合管廊拟静力试验面外加载螺旋箍筋套筒底节点

Sisyphus effects in hydrogen electrochemistry on metal silicides enabled by silicene subunit edge

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Science Bulletin 2019年第9期64卷 617-624页

作者： Zechao Zhuang Yong li Jiazhao Huang zilan li Kangning Zhao Yunlong Zhao lin Xu liang Zhou Lyudmila V. Moskaleva liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology University of Bremen Advanced Technology Institute University of Surrey Department of Chemistry University of the Free State

Nonmetal elements strictly govern the electrochemical performance of molybdenum compounds.Yet,the exact role played by nonmetals during electrocatalysis remains largely obscure.With intermetallic MoSi_2comprising silicene subunits,we present an unprecedented hydrogen evolution reaction(HER)behavior in aqueous alkaline solution.Under continuous operation,the HER activity of MoSi_2shows a more than one order of magnitude improvement in current density from 1.1 to 21.5 mA cm^(à2)at 0.4 V overpotential.Meanwhile,this activation behavior is highly reversible,such that voltage withdrawal leads to catalyst inactivation but another operation causes reactivation.Thus,the system shows dynamics strikingly analogous to the legendary Sisyphus’labor,which drops and recovers in a stepwise manner repeatedly,but never succeeds in reaching the top of the mountain.Isomorphic WSi_2behaves almost the same as MoSi_2,whereas other metal silicides with silicyne subunits,including CrSi_2and TaSi_2,do not exhibit any anomalous behavior.A thin amorphous shell of MoSi_2is observed after reaction,within which the Si remains partially oxidized while the oxidation state of Mo is basically unchanged.First-principles calculations further reveal that the adsorption of hydroxide ions on silicene subunit edges and the subsequent Si vacancy formation in MoSi_2jointly lead to the anomalous HER kinetics of the adjacent Mo active centers.This work demonstrates that the role of nonmetal varies dramatically with the electronic and crystallographic structures of silicides and that silicene structural subunit may serve as a promoter for boosting HER in alkaline media.

关键词： Sisyphus effect Electrochemistry Metal silicides Silicene subunit Hydrogen evolution reaction

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茭白病害及其病原菌名称的演变

植物保护 2024年第2期50卷 252-260,286页

作者：龚婉肖紫兰李斌郭得平张敬泽浙江大学农业与生物技术学院生物技术研究所杭州310058 浙江大学农业与生物技术学院蔬菜研究所杭州310058

茭白是我国重要的特色水生蔬菜之一,对于丰富菜篮子和提高农民收入起到重要作用。随着大规模的人工栽培,茭白病害日益成为影响茭白产业发展的严重问题。然而,生产中经常存在不能正确使用茭白病害及其病原菌名称的问题,影响了对病害的识... 详细信息

茭白是我国重要的特色水生蔬菜之一,对于丰富菜篮子和提高农民收入起到重要作用。随着大规模的人工栽培,茭白病害日益成为影响茭白产业发展的严重问题。然而,生产中经常存在不能正确使用茭白病害及其病原菌名称的问题,影响了对病害的识别与防治。这是由于不同研究者对病害认识的侧重点不同,导致同一病害在不同国家或地区具有不同的名称;而随着人们对病原菌认识的不断深入,引起病原菌分类地位的不断变化,也使同一种病原菌在分类史上出现不同的名称。正确使用病害及其病原菌名称,可提供病害特征及其病原菌生物学特性的信息,这对指导病害识别与防治尤为重要。本文系统介绍了茭白病害及其病原菌,尤其从病原菌分类史上说明病原菌名称演变的原因以及最新研究进展,为理解和正确使用病原菌名称提供了参考依据。同时,结合我们的研究工作,展望了茭白病害和病原菌未来研究和发展的趋势,提出了潜在病原菌可能传播的植物检疫问题。

关键词：美味黑粉菌稻平脐蠕孢冠单胞锈菌菠萝泛菌菰类腐霉研究进展

高龄与Ⅱ期结直肠癌患者预后不良的相关性研究

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中国癌症杂志 2024年第5期34卷 485-492页

作者：张若昕叶紫岚翁俊勇李心翔复旦大学附属肿瘤医院大肠外科复旦大学上海医学院肿瘤学系上海200032

背景与目的:随着人口老龄化,老年结直肠癌(colorectal cancer,CRC)患者日益增加。目前高龄Ⅱ期CRC患者在接受根治术后通常接受减弱的化疗方案或不化疗,而这是否会引起不良的肿瘤学结局目前仍不明确。本研究旨在通过多因素COX回归分析方... 详细信息

背景与目的:随着人口老龄化,老年结直肠癌(colorectal cancer,CRC)患者日益增加。目前高龄Ⅱ期CRC患者在接受根治术后通常接受减弱的化疗方案或不化疗,而这是否会引起不良的肿瘤学结局目前仍不明确。本研究旨在通过多因素COX回归分析方法探究去除偏倚后,高龄对于Ⅱ期CRC患者预后的影响。方法:回顾性收集3 314例2008—2019年在复旦大学附属肿瘤医院接受过手术治疗且术后病理学检查结果为Ⅱ期、无既往肿瘤史、术后5年内无第二原发肿瘤且术前未接受新辅助治疗的CRC患者。本研究通过复旦大学附属肿瘤医院医学伦理委员会的审查(伦理编号:050432-4-2108^(*))。使用R软件(version 3.0)的survminer包(surv_cutpoint算法)计算年龄相对于生存的最佳临界值为73岁。比较高龄组(年龄>73岁)和非高龄组(年龄≤73岁)的临床病理学特征、总生存期(overall survival,OS)和无病生存期(disease-free survival,DFS),并使用survival包和rms包绘制列线图预测模型。结果:高龄组和非高龄组在性别、肿瘤位置、分化、脉管侵犯、神经侵犯和pT分期等方面均衡可比。多因素COX回归分析显示,高龄是OS[风险比(hazard ratio,HR)=3.667(2.946~4.565),P <0.001]和DFS[HR=2.368(1.953~2.872),P<0.001]的独立预后危险因素。根据多因素COX回归分析构建的列线图预测模型可以有效地评估Ⅱ期CRC患者的预后。结论:在Ⅱ期CRC患者中,高龄与较短的OS及DFS相关。足够强度的辅助化疗或许是必要的。治疗决策可根据患者列线图预测模型得分进行调整。

关键词：结直肠癌高龄预后化疗方案预测模型

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不同场地条件下埋地腐蚀钢管地震易损性评价

岩土工程学报 2024年第4期46卷 774-783页

作者：韩俊艳李玉凤钟紫蓝缪惠全杜修力北京工业大学城市与工程安全减灾教育部重点实验室北京100124

为评估不同场地中埋地腐蚀管道的抗震性能,建立管-土非线性相互作用分析模型,基于增量动力时程分析方法,以埋地钢管结构应变为性能参数,对不同场地中埋地腐蚀管道的地震易损性进行了分析。结果表明:同一场地条件和服役龄期下,随地震动... 详细信息

为评估不同场地中埋地腐蚀管道的抗震性能,建立管-土非线性相互作用分析模型,基于增量动力时程分析方法,以埋地钢管结构应变为性能参数,对不同场地中埋地腐蚀管道的地震易损性进行了分析。结果表明:同一场地条件和服役龄期下,随地震动强度的增大,管道处于基本完好状态的概率逐渐降低,处于严重破坏状态的概率逐渐增加;同一场地条件下,随管道服役龄期的延长,中等损坏极限的曲线斜率增长明显大于基本完好极限的曲线斜率,但管道失效的速率在逐渐变小,软弱场地中服役龄期50a管道在抗震设防烈度8度时已发生中等损坏;同一地震动强度和服役龄期下,随场地等效剪切波速的减小,管道达到基本完好极限、中等损坏极限的失效概率逐渐增大,软弱场地中失效概率最大;同一服役龄期下,随场地等效剪切波速的减小,管道达到中等损坏、严重破坏的地震动峰值加速度明显降低,较低地震烈度下的软弱场地管道震害甚至高于较高地震烈度下的坚硬场地。本研究可为不同场地中埋地腐蚀管道的震害预测及灾后损失评估提供参考。

关键词：场地条件埋地腐蚀管道地震强度易损性

主动脉腔内全程重塑装置(AERD)治疗Stanford B型主动脉夹层术后远端残余夹层临床效果

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中华胸心血管外科杂志 2024年第6期40卷 331-334页

作者：张静隆陈佳李超孙子兰李子林左健空军军医大学西京医院心血管外科西安

目的评估主动脉腔内全程重塑装置(aortic endovascular remodeling device, AERD)在Stanford B型主动脉夹层术后远端残余夹层治疗中的安全性和有效性。方法采用前瞻性队列研究设计, 根据入排标准, 纳入2022年1月至2023年12月, 共60例Sta... 详细信息

目的评估主动脉腔内全程重塑装置(aortic endovascular remodeling device, AERD)在Stanford B型主动脉夹层术后远端残余夹层治疗中的安全性和有效性。方法采用前瞻性队列研究设计, 根据入排标准, 纳入2022年1月至2023年12月, 共60例Stanford B型主动脉夹层胸主动脉腔内修复术(TEVAR)术后患者, 利用AERD进行治疗, 收集术前术后CTA影像资料, 采用计算机三维重建流体力学进行分析, 评估术后远端主动脉重塑情况。结果术后30天内无主要不良事件发生, 无与主动脉夹层相关死亡。术后短期结果显示, 应用AERD治疗Stanford B型主动脉夹层术后远端残余夹层是安全的。AERD治疗明显增加夹层段真腔体积, 增幅达到88.44%, 同时AERD治疗明显减少夹层段假腔体积, 减幅达到61.04%, 效果显著。AERD治疗除对支架远端主动脉真腔最长径和肠系膜上动脉上缘主动脉真腔最长径无明显影响外, 相比于主动脉真腔最长径的变化, 主动脉真腔最短径的变化更为显著, 支架远端主动脉真腔最短径增幅32.29%, 主动脉短径最窄处真腔最短径增幅204.15%, 肠系膜上动脉上缘主动脉真腔最短径增幅80.76%, 肾动脉下缘主动脉真腔最短径增幅115.26%, 左髂动脉开口处真腔最短径增幅152.01%, 右髂动脉开口处真腔最短径增幅144.21%, AERD显著促进Stanford B型主动脉夹层术后远端主动脉良性重塑。结论 AERD在Stanford B型主动脉夹层术后远端残余夹层治疗中安全有效, 术后早期就能促进真腔扩张、假腔缩减, 促进Stanford B型主动脉夹层TEVAR术后主动脉远端良性重塑。

关键词： Stanford B型主动脉夹层残余夹层主动脉腔内重塑装置远端主动脉重塑

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强震作用下跨断层管道柔性接口抗震加固研究

世界地震工程 2024年第1期40卷 25-33页

作者：钟紫蓝赵鑫张亚波李锦强许成顺杜修力北京工业大学城市与工程安全减灾教育部重点实验室北京100124

强烈地震引起的地面永久性大变形是导致埋地供水管线损坏的主要威胁之一。该研究借鉴链式结构的设计思想,基于传统承插式管道接口形式,研发了一种新型管道抗震接口,其可支持一定的轴向伸缩自由变形。当接口变形量达至极限状态时,接口发... 详细信息

强烈地震引起的地面永久性大变形是导致埋地供水管线损坏的主要威胁之一。该研究借鉴链式结构的设计思想,基于传统承插式管道接口形式,研发了一种新型管道抗震接口,其可支持一定的轴向伸缩自由变形。当接口变形量达至极限状态时,接口发生自锁现象并能提供较高的抗拉承载力,进而带动相邻管道滑移,以抵消断层错动引起的变形量。针对新型抗震接口开展了轴向力学性能试验,并建立了跨断层下的管线数值模型;同时,数值结果与相关全尺寸试验进行对比验证。该研究以土体压实条件和断层穿越管道位置作为关键变量,研究了加固前后断层错动下承插式管道的力学响应。研究结果表明:提出的抗震接口能够有效地提高管道抵抗地面大变形能力,并且提高接口的轴向抗拉拔能力是提升管道抗断层错动能力的关键;对于松砂土跨断层下的承插式管道接口震损较为严重;断层穿越管道不同的位置会造成不同的接口变形规律;国内规范中管道接口的转角限值过于保守,不利于对跨断层承插式管道安全性能进行合理验算。

关键词：巨震作用跨断层球墨铸铁管抗震加固接口变形