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Variability of the Pacific subtropical cells under global warming in CMIP6 models

Journal of Oceanology and Limnology 2024年第1期42卷 24-40页

作者： Xue han Junqiao FENG Yunlong LU Dunxin hu Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The Pacific subtropical cells(STCs)are shallow meridional overturning circulations connecting the tropics and subtropics,and are assumed to be an important driver of the tropical Pacific decadal *** variability of STCs under global warming is investigated using multimodal outputs from the latest phase of the Coupled Model Inter-comparison Project(CMIP6)and ocean reanalysis ***,the volume transport diagnostic analysis is employed to evaluate how coupled models and ocean reanalysis products reproduce interior STC *** variation of heat transport by the interior STC under the high-emissions warming scenarios is also *** results show that the multimodal-mean linear trends of the interior STC transport along 9°S and 9°N are-0.02 Sv/a and 0.04 Sv/a under global warming,respectively,which is mainly due to the combined effect of the strengthened upper oceanic stratification and the weakening of wind *** is a compensation relationship between the interior STC and the western boundary transport in the future climate,and the compensation relationship of 9°S is more significant than that of 9°*** addition,compared with ocean reanalysis products,the coupled models tend to underestimate the variability of the interior STC transport convergence,and thus may lose some sea surface temperature(SST)driving force,which may be the reason for the low STC-SST correlation simulated by the *** future scenario simulation shows that the heat transport of interior STC is weakened under global warming,with a general agreement across models.

关键词： interior subtropical cell(STC) global warming Coupled Model Inter-comparison Project(CMIP6) western boundary transport

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Iron adsorption engineering facilitated by Cu doping on cobalt hydroxide host with enhanced oxygen evolution reaction

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Nano Research 2023年第2期16卷 2111-2118页

作者： Xinyu Zhang Yiwen Dong huiying Wang Ziyi Zhao Wenchun Jiang Bin Dong han hu Chenguang Liu Yongming Chai State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China College of New Energy China University of Petroleum(East China)Qingdao 266580China

Iron plays a crucial role in improving the oxygen evolution reaction(OER)activity of hydroxide *** the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER performance of catalysts but still ***,by systematic exploring the activity trends of M(OH)_(x)and Cu-M(OH)_(x)(M=Mn,Cu,Ni,Fe,and Co),we discover that the Cu doping can promote the deposition of Fe active sites on metal hydroxide and Cu-Co(OH)2 shows the most favorable iron adsorption *** loaded on a conductive substrate(cobalt foam(CF),the M-Cu-Co(OH)2/CF(Co(OH)_(2))prepared by molten salt method)exhibits an attractive low overpotential of 337 mV at 1,000 mA·cm^(−2).Using in anion exchange membrane(AEM)water electrolyzer,the single cell with M-Cu-Co(OH)_(2)/CF as anode catalyst performs a stable cell voltage of 2.02 V to reach 1,000 mA·cm^(−2)over 24 h,indicating a great application potential for actual electrolytic ***,the promoted adsorption of copper on iron provides a new perspective for further enhancing the OER activity of other metal hydroxides.

关键词： copper doping promoted Fe adsorption industrial-level current density anion exchange membrane water electrolyzer oxygen evolution reaction

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A non-probabilistic reliability topology optimization method based on aggregation function and matrix multiplication considering buckling response constraints

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Applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 321-336页

作者： Lei WANG Yingge LIU Juxi hu Weimin CHEN Bing han Institute of Solid Mechanics School of Aeronautic Science and EngineeringBeihang UniversityBeijing 100191China Aircraft and Propulsion Laboratory Ningbo Institute of TechnologyBeihang UniversityNingbo 315100Zhejiang ProvinceChina State Key Laboratory of Navigation and Safety Technology Shanghai Ship and Shipping Research InstituteShanghai 200135China National Engineering Research Center of Ship&Shipping Control System Shanghai Ship and Shipping Research InstituteShanghai 200135China

A non-probabilistic reliability topology optimization method is proposed based on the aggregation function and matrix *** expression of the geometric stiffness matrix is derived,the finite element linear buckling analysis is conducted,and the sensitivity solution of the linear buckling factor is *** a specific problem in linear buckling topology optimization,a Heaviside projection function based on the exponential smooth growth is developed to eliminate the gray *** aggregation function method is used to consider the high-order eigenvalues,so as to obtain continuous sensitivity information and refined structural *** cyclic matrix programming,a fast topology optimization method that can be used to efficiently obtain the unit assembly and sensitivity solution is *** maximize the buckling load,under the constraint of the given buckling load,two types of topological optimization columns are *** variable density method is used to achieve the topology optimization solution along with the moving asymptote optimization *** vertex method and the matching point method are used to carry out an uncertainty propagation analysis,and the non-probability reliability topology optimization method considering buckling responses is developed based on the transformation of non-probability reliability indices based on the characteristic ***,the differences in the structural topology optimization under different reliability degrees are illustrated by examples.

关键词： buckling topology optimization aggregation function uncertainty propagation analysis non-probabilistic reliability

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Polymer: Non-fullerene acceptor heterojunction-based phototransistor for short-wave infrared photodetection

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Nano Research 2024年第4期17卷 3087-3095页

作者： Jing Li Weigang Zhu Yang han Yanhou Geng Wenping hu Key Laboratory of Organic Integrated Circuits of Ministry of Education&Key Laboratory of Molecular Optoelectronic Sciences School of Science&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China Key Laboratory of Organic Integrated Circuits of Ministry of Education&Key Laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

It remains full of challenge for extending short-wave infrared(SWIR)spectral response and weak-light detection in the context of broad spectral responses for *** this work,a novel poly(2,5-bis(4-hexyldodecyl)-2,5-dihydro-3,6-di-2-thienyl-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-thiophene)(PDPPT3-HDO):COTIC-4F organic bulk-heterojunction is prepared as active layer for bulk heterojunction ***3-HDO serves as a hole transport material,while COTIC-4F enhances the absorption of SWIR light to 1020 *** a result,smooth and connected PDPPT3-HDO film is fabricated by blade coating method and exhibits high hole mobility up to 2.34 cm^(2)·V^(-1)·s^(-1) with a current on/off ratio of 4.72×10^(5) in organic thin film ***3-HDO:COTIC-4F heterojunction phototransistors exhibit high responsivity of 2680 A·W^(-1) to 900 nm and 815 A·W^(-1) to 1020 nm,with fast response time(rise time~20 ms and fall time~100 ms).The photosensitivity of the heterojunction phototransistor improves as the mass ratio of non-fullerene acceptors increases,resulting in an approximately two orders of magnitude enhancement compared to the bare polymer ***,the phototransistor exhibits decent responsivity even under ultra-weak light power of 43μW·cm^(-2) to 1020 *** work represents a highly effective and general strategy for fabricating efficient and sensitive SWIR light photodetectors.

关键词： photodetection phototransistor organic semiconductor heterojunction non-fullerene acceptor

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Ballistic target recognition based on multiple data representations and deep-learning algorithms

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Chinese Journal of Aeronautics 2024年第6期37卷 167-181页

作者： Lixun han Cunqian FENG Xiaowei hu Sisan HE Xuguang XU Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China College of Information and Communication National University of Defense TechnologyWuhan 430010China

Target recognition is a significant part of a Ballistic Missile Defense System(BMDS).However,most existing ballistic target recognition methods overlook the impact of data representation on recognition *** paper focuses on systematically investigating the influences of three novel data representations in the Range-Doppler(RD)***,the Radar Cross Section(RCS)and micro-Doppler(m-D)characteristics of a cone-shaped ballistic target are ***,three different data representations are proposed:RD data,RD sequence tensor data,and RD trajectory *** accommodate various data inputs,deep-learning models are designed,including a two-Dimensional Residual Dense Network(2D RDN),a three-Dimensional Residual Dense Network-Gated Recurrent Unit(3D RDN-GRU),and a Dynamic Trajectory Recognition Network(DTRN).Finally,an Electromagnetic(EM)computation dataset is collected to verify the performances of the networks.A broad range of experimental results demonstrates the effectiveness of the proposed ***,several key parameters of the proposed networks and datasets are extensively studied in this research.

关键词： Ballistic target Micro-Doppler Deep learning Range-Doppler Radar target recognition

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A Local-Global Attention Fusion Framework With Tensor Decomposition for Medical Diagnosis

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1536-1538页

作者： Peishu Wu han Li Liwei hu Jirong Ge Nianyin Zeng Department of Instrumental and Electrical Engineering Xiamen UniversityFujian 361005China Key Research Laboratory of Osteoporosis Syndrome Genomics Fujian Academy of Chinese Medical SciencesFuzhou 350003China

Dear Editor,In this letter,a novel hierarchical fusion framework is proposed to address the imperfect data property in complex medical image analysis(MIA)*** particular,by combining the strengths of convolutional neural networks(CNNs)and transformers,the enhanced feature extraction,spatial modeling,and sequential context learning are realized to provide comprehensive insights on the complex data *** of information in different level is enabled via a multi-attention fusion mechanism,and the tensor decomposition methods are adopted so that compact and distinctive representation of the underlying and high-dimensional medical image features can be accomplished[1].It is shown from the evaluation results that the proposed framework is competitive and superior as compared with some other advanced algorithms,which effectively handles the imperfect property of inter-class similarity and intra-class differences in diseases,and meanwhile,the model complexity is reduced within an acceptable level,which benefits the deployment in clinic *** has assumed a pivotal role in numerous critical clinical scenarios,where sophisticated image analysis techniques have proven instrumental in augmenting medical decision-making,facilitating individualized therapeutic interventions,and enhancing patient prognostication[2]−[4].

关键词： handle image property

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How the surface Cu layer affected the activity of Ni foil for alkaline hydrogen evolution

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Journal of Materials Science & Technology 2024年第2期169卷 11-18页

作者： Qingfeng hu Yuan Liu Xuerong Zheng Jinfeng Zhang Jiajun Wang Xiaopeng han Yida Deng Wenbin hu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China

Synthesizing bimetallic nanomaterials,with noble metals as the surface layers and inert metals as the substrates,has been proven to be an effective way to reduce the use of noble metals with maintained catalytic ***,an atomic diffusion from the inert substrate to the surface during the long-term operation has been reported to significantly decrease the *** this work,a series of catalysis-inert Cu-coated Ni foil were fabricated through electrodeposition and their activities for alkaline hydrogen evolution were ***,the Ni/Cu-60 sample showed a similar catalytic property with pure Ni foil and only a slight decrease in HER activity was *** X-ray photoelectron spectroscopy(XPS)results indicated a decreased electron concentration of Cu in Ni/Cu-60,and theoretical calculations further demonstrated the electron transfer between the Ni substrate and Cu *** results reveal that a specific composition or structure of an inert metal layer might not significantly decrease the electrocatalytic activity of active ***,there are more possibilities for the rational design of metal-based catalysts for electrocatalysis.

关键词： Bimetallic heterostructure Charge redistribution Water splitting Alkaline hydrogen evolution

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Exploring the correlation between temperature and crime:A case-crossover study of eight cities in America

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Journal of Safety Science and Resilience 2024年第1期5卷 13-36页

作者： Jinming hu Xiaofeng hu Xin’ge han Yan Lin huanggang Wu Bing Shen School of Information Technology and Cyber Security People’s Public Security University of ChinaBeijing 100038China Center for Capital Social Safety People’s Public Security University of ChinaBeijing 100038China China Association for Public Safety Beijing 100084China School of Emergency Management and Safety Engineering China University of Mining and TechnologyBeijing 100083China School of International Police Studies People’s Public Security University of ChinaBeijing 100038China

Recent years have seen increasing academic interest in exploring the correlation between temperature and ***,it is uncertain whether similar long-term trends or seasonality(rather than causal effect)of temper-ature and crime is the major reason for the observed correlation between *** explore whether there is still a correlation between temperature and crime when long-term trends and seasonal cycles are filtered out,we use the Kalman filter to decompose the time series of temperature and crimes,and then the fast Fourier transform is used to calculate the exact circle of their seasonality *** on that,the box-plot method and linear regression are used to explore the correlation between temperature residuals and crime *** results show that more than half of the crime types have similar seasonal cycles(approximately 1 year)to that of ***,the daily residual analyses show that temperature residuals have a positive correlation with assault and robbery residuals in all cities,whose average slopes are more than *** other four types of crimes vary greatly from case to *** temperature residuals show a weak correlation with the residuals of some crime types.

关键词： Time series decomposition Crime Temperature Kalman filter Fast fourier transform

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单节扩张抗式消声器声传输特性研究

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南阳理工学院学报 2024年第2期16卷 36-41页

作者：尹宗军苏蓉黄自成马学刚胡汉春安徽信息工程学院机械工程学院安徽芜湖241100

汽车消声器能降低管道系统内部噪声的传播,对于削弱汽车发动机排气噪声具有优越的效果。利用COMSOL软件建立单节扩张抗式消声器的三维模型,经过验证网格无关性,消除了网格参数对消声器传递损失的影响,运用控制变量原理分别对进出口位置... 详细信息

汽车消声器能降低管道系统内部噪声的传播,对于削弱汽车发动机排气噪声具有优越的效果。利用COMSOL软件建立单节扩张抗式消声器的三维模型,经过验证网格无关性,消除了网格参数对消声器传递损失的影响,运用控制变量原理分别对进出口位置偏移、长度比以及扩张比的参数进行赋值,得到不同的声压以及传递损失云图。研究表明:进出口管位置偏移在频率为0~1800 Hz时的消声能力一致,但当频率为中频1000~3000 Hz时,消声器进出口管位置偏移越大,其消音能力越好;当频率在0~3500 Hz时,随着膨胀腔长度的不断减小,消声器的传递损失曲线向着高频率移动,而传递损失的峰值没有明显变化。

关键词：传递损失抗式消声器声传输特性

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基于区块链技术的旅游服务及可视化分析系统设计

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长江信息通信 2024年第2期37卷 166-169页

作者：丁宇阳胡涵王莹露崔晓会罗瑞宋莺湖北经济学院信息工程学院湖北武汉430205

当前全球旅游业面临的信息安全、监管、信息透明度和服务质量等挑战。区块链技术的特性,如去中心化、分布式账本和智能合约,提供了解决这些问题的有效手段。本系统的设计采用了浏览器/服务器框架,关键技术包括多维度爬虫技术、基于区块... 详细信息

当前全球旅游业面临的信息安全、监管、信息透明度和服务质量等挑战。区块链技术的特性,如去中心化、分布式账本和智能合约,提供了解决这些问题的有效手段。本系统的设计采用了浏览器/服务器框架,关键技术包括多维度爬虫技术、基于区块链的数据管理、数据分析与可视化等关键模块。将区块链技术用于旅游服务系统的信息安全与监管,可提供高级加密和信息共享的解决方案,以应对旅游业中的不文明行为、虚假宣传和价格透明度等问题。该实验系统的搭建,为旅游部门提供更加安全、透明和高质量的服务。

关键词：区块链技术数据分析网络爬虫数据隐私及安全

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