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半封闭式车站列车风压极值分布规律研究

振动与冲击 2024年第12期43卷 1-8页

作者：郑华冬郑浩东王贞谢伟平吴斌武汉理工大学海南研究院海南三亚572025 武汉理工大学土木工程与建筑学院武汉430070

为了研究半封闭式车站内风压极值的分布规律,对高速列车通过高铁站时引起的列车风压进行数值模拟,并通过现场实测数据验证数值模型的准确性。基于验证的数值模型,研究列车分别以250 km/h、300 km/h和350 km/h的速度通过高铁站时,两个典... 详细信息

为了研究半封闭式车站内风压极值的分布规律,对高速列车通过高铁站时引起的列车风压进行数值模拟,并通过现场实测数据验证数值模型的准确性。基于验证的数值模型,研究列车分别以250 km/h、300 km/h和350 km/h的速度通过高铁站时,两个典型区域(临近站台区Ⅰ、远离站台区Ⅱ)的风压(头波、尾波的正压和负压)极值分布规律,并提出相应的风压极值经验公式。研究结果表明:风压极值与列车速度之间呈非线性关系;相同的车速下,区域Ⅰ和区域Ⅱ内列车风压极值随着水平距离的增加呈指数函数形式衰减,而衰减的速度与高度成反比;当水平距离小于15 m时,相同高度下区域Ⅰ的头波正压极值总是比区域Ⅱ的大,而区域Ⅰ的头波负压极值的绝对值又总比区域Ⅱ的小;当水平距离超过15 m时,车站内的风压极值逐渐趋于稳定,并且区域Ⅰ内趋于稳定的风压极值要强于区域Ⅱ;所提经验公式能够较为准确地描述半封闭式高铁站内列车风压极值分布规律。研究成果可为半封闭式车站的结构设计提供参考。

关键词：半封闭式高铁站现场实测列车风压力极值滑移网格

Scaling laws governing the elastic properties of 3D graphenes

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Science China(Technological Sciences) 2024年第6期67卷 1748-1756页

作者： LI Ming LU Guo YU haodong LI MengLei zheng FaWei Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing100081China Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing100081China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China Department of Physics Capital Normal UniversityBeijing100048China

In this study,we comprehensively investigated the scaling law for elastic properties of three-dimensional honeycomb-like graphenes(3D graphenes)using hybrid neural network potential-based molecular dynamics simulations and theoretical *** elastic constants were obtained as functions of honeycomb hole size,denoted by the graphene wall length *** five independent elastic constants in the large-L limit are proportional to L^(-1).The associated coefficients are combinations of elastic constants of two-dimensional ***-order terms including L^(-2)and L^(-3)emerge for finite L *** have three origins,the distorted areas close to the joint lines of 3D graphenes,the variation in solid angles between graphene plates,and the bending distortion of graphene ***,the chirality becomes essential with decreasing L because the joint line structures are different between the armchair and zigzag-type 3D *** findings provide insights into the elastic properties of graphene-based superstructures and can be used for further studies on graphene-based materials.

关键词： scaling law neural network elastic properties 3D graphene

A Sustainable Dual Cross‑Linked Cellulose Hydrogel Electrolyte for High‑Performance Zinc‑Metal Batteries

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Nano-Micro Letters 2024年第6期16卷 63-75页

作者： haodong Zhang Xiaotang Gan Yuyang Yan Jinping Zhou Hubei Engineering Center of Natural Polymers‑Based Medical Materials Key Laboratory of Biomedical Polymers of Ministry of EducationCollege of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072People’s Republic of China Zhongnan Hospital of Wuhan University Institute of Hepatobiliary Diseases of Wuhan UniversityTransplant Center of Wuhan UniversityWuhan 430072People’s Republic of China

Aqueous rechargeable Zn-metal batteries(ARZBs)are considered one of the most promising candidates for grid-scale energy ***,their widespread commercial application is largely plagued by three major challenges:The uncontrollable Zn dendrites,notorious parasitic side reactions,and sluggish Zn^(2+) ion *** address these issues,we design a sustainable dual crosslinked cellulose hydrogel electrolyte,which has excellent mechanical strength to inhibit dendrite formation,high Zn^(2+) ions binding capacity to suppress side reaction,and abundant porous structure to facilitate Zn^(2+) ions ***,the Zn||Zn cell with the hydrogel electrolyte can cycle stably for more than 400 h under a high current density of 10 mA cm^(−2).Moreover,the hydrogel electrolyte also enables the Zn||polyaniline cell to achieve high-rate and long-term cycling performance(>2000 cycles at 2000 mA g^(−1)).Remarkably,the hydrogel electrolyte is easily accessible and biodegradable,making the ARZBs attractive in terms of scalability and sustainability.

关键词： Cellulose Dual cross-linked Aqueous rechargeable Zn-metal batteries Hydrogel electrolyte

Dynamic performance and parameter optimization of a half-vehicle system coupled with an inerter-based X-structure nonlinear energy sink

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 85-110页

作者： Yong WANG Peili WANG haodong MENG Liqun CHEN .Automotive Engineering Research Institute Jiangsu UniversityZhenjiang 212013Jiangsu ProvinceChina Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and TechnologyLiuzhou 545006Guangxi Zhuang Autonomous RegionChina School of Automotive Engineering Changzhou Institute of TechnologyChangzhou 213032Jiangsu ProvinceChina Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China

Inspired by the demand of improving the riding comfort and meeting the lightweight design of the vehicle, an inerter-based X-structure nonlinear energy sink(IXNES) is proposed and applied in the half-vehicle system to enhance the dynamic performance. The X-structure is used as a mechanism to realize the nonlinear stiffness characteristic of the NES, which can realize the flexibility, adjustability, high efficiency, and easy operation of nonlinear stiffness, and is convenient to apply in the vehicle suspension, and the inerter is applied to replacing the mass of the NES based on the mass amplification characteristic. The dynamic model of the half-vehicle system coupled with the IX-NES is established with the Lagrange theory, and the harmonic balance method(HBM) and the pseudo-arc-length method(PALM) are used to obtain the dynamic response under road harmonic excitation. The corresponding dynamic performance under road harmonic and random excitation is evaluated by six performance indices, and compared with that of the original half-vehicle system to show the benefits of the IX-NES. Furthermore, the structural parameters of the IX-NES are optimized with the genetic algorithm. The results show that for road harmonic and random excitation, using the IX-NES can greatly reduce the resonance peaks and root mean square(RMS) values of the front and rear suspension deflections and the front and rear dynamic tire loads, while the resonance peaks and RMS values of the vehicle body vertical and pitching accelerations are slightly *** the structural parameters of the IX-NES are optimized, the vehicle body vertical and pitching accelerations of the half-vehicle system could reduce by 2.41% and 1.16%,respectively, and the other dynamic performance indices are within the reasonable ***, the IX-NES combines the advantages of the inerter, X-structure, and NES, which improves the dynamic performance of the half-vehicle system and provides an effective option for vibrati

关键词： inerter X-structure nonlinear energy sink(NES) half-vehicle system dynamic performance

1株猪源A型产气荚膜梭菌的分离鉴定及致病性研究

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中国畜牧兽医 2024年第6期51卷 2697-2706页

作者：吴钰兴邹潍力程子馨莫玉鹏张凌源纪宛彤陈思宇郑浩东麻润雯李珣李茂宁王晓晔广西大学动物科学技术学院广西壮族自治区兽用生物制品工程研究中心广西畜禽繁育与疾病防控重点实验室广西高校动物疫病预防与控制重点实验室南宁530004 广西桂林力源集团桂林541012 重庆市渝东卫生学校重庆408300 桂林市动物疫病预防控制中心桂林541000 东莞市动物疫病预防控制中心东莞523000

【目的】探究A型产气荚膜梭菌在仔猪腹泻中的致病性,为A型产气荚膜梭菌感染所致腹泻的诊断和治疗提供理论依据和参考。【方法】通过培养特性和革兰染色镜检对分离菌进行初步鉴定,通过生化试验、毒素基因PCR扩增、16S rRNA序列比对并构... 详细信息

【目的】探究A型产气荚膜梭菌在仔猪腹泻中的致病性,为A型产气荚膜梭菌感染所致腹泻的诊断和治疗提供理论依据和参考。【方法】通过培养特性和革兰染色镜检对分离菌进行初步鉴定,通过生化试验、毒素基因PCR扩增、16S rRNA序列比对并构建进化树对可疑菌株进一步鉴定,利用药敏试验和动物回归试验研究分离菌株的耐药性和致病性。【结果】分离菌株在TSN平板上呈黑色菌落,在血平板上呈α、β双溶血环,革兰染色呈紫色粗大杆菌。生化试验结果显示,分离菌株葡萄糖、麦芽糖、蔗糖、乳糖、还原性硝酸盐试验、H_2S试验和明胶液化均呈阳性,甘露醇、吲哚试验和水杨酸结果呈阴性。16S rRNA序列比对结果显示,分离菌与NCBI数据库中已公布的产气荚膜梭菌16S rRNA基因序列相似性均>99%,鉴定该菌株为产气荚膜梭菌。PCR扩增出plc及cpb2基因,表明该菌株为携带β2毒素的A型产气荚膜梭菌。药敏试验结果显示,分离菌株对青霉素G、庆大霉素、林可霉素、磺胺异噁唑、环丙沙星、诺氟沙星耐药。动物回归试验结果显示,攻菌后仔猪粪便中可检出大量产气荚膜梭菌,该菌株可引起仔猪腹泻,死亡率达50%;死亡仔猪剖检可见小肠充血、出血、鼓气,从脾脏、小肠中可分离出产气荚膜梭菌,且在损伤严重的空肠肠段中分离出高载量A型产气荚膜梭菌。【结论】本试验成功分离出1株A型产气荚膜梭菌,可引起新生仔猪发病,致病性较强,该研究结果为A型产气荚膜梭菌感染仔猪的诊断、流行病学调查、治疗提供了参考依据。

关键词： A型产气荚膜梭菌新生仔猪分离鉴定致病性

维普期刊数据库博看期刊

Hierarchically Structured Nb_(2)O_5 Microflowers with Enhanced Capacity and Fast-Charging Capability for Flexible Planar Sodium Ion Micro-Supercapacitors

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Nano-Micro Letters 2024年第4期16卷 97-109页

作者： Jiaxin Ma Jieqiong Qin Shuanghao zheng Yinghua Fu Liping Chi Yaguang Li Cong Dong Bin Li Feifei Xing haodong Shi Zhong‑Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China College of Science Henan Agricultural UniversityNo.63 Agricultural RoadZhengzhou 450002People’s Republic of China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China University of Chinese Academy of Sciences 19A Yuquan RoadShijingshan DistrictBeijing 100049People’s Republic of China Hebei Key Lab of Optic‑Electronic Information and Materials The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002People’s Republic of China

Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless, the development of NIMSCs are hugely impeded by the low capacity and sluggish Na ion kinetics in the negative ***, we demonstrate a novel carbon-coated Nb_(2)O_5 microflower with a hierarchical structure composed of vertically intercrossed and porous nanosheets, boosting Na ion storage performance. The unique structural merits, including uniform carbon coating, ultrathin nanosheets and abun-dant pores, endow the Nb_(2)O_5 microflower with highly reversible Na ion storage capacity of 245 mAh g^(-1) at 0.25 C and excellent rate *** from high capacity and fast charging of Nb_(2)O_5 microflower, the planar NIMSCs consisted of Nb_(2)O_5 negative electrode and activated car-bon positive electrode deliver high areal energy density of 60.7 μWh cm^(-2),considerable voltage window of 3.5 V and extraordinary cyclability. Therefore, this work exploits a structural design strategy towards electrode materials for application in NIMSCs, holding great promise for flexible microelectronics.

关键词： Nb_(2)O_5 nanosheets Microflowers Sodium ion micro-supercapacitors Flexibility Energy storage

A review on g-C_(3)N_(4)decorated with silver for photocatalytic energy conversion

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Chinese Chemical Letters 2024年第2期35卷 187-196页

作者： Ziyu Pan Wufan Ding Hanchun Chen haodong Ji Eco-environment and Resource Efficiency Research Laboratory School of Environment and EnergyPeking University Shenzhen Graduate SchoolShenzhen 518055China

Artificial photocatalytic energy conversion is considered as the most potential strategy for solving the increasingly serious energy crisis and environmental pollution problems by directly capturing solar ***,high efficiency photocatalyst has drawn significant research attention in recent *** to the excellent electronic,optical,structural,and physicochemical performances,silver-based g-C_(3)N_(4)have become promising *** review emphasizes the recent progresses and challenges on g-C_(3)N_(4)decorated with silver for photocatalytic energy *** extensive use of g-C_(3)N_(4)decorated with silver in diverse photocatalytic reactions,including hydrogen evolution,pollutant degradation and carbon dioxide reduction,is also fully *** addition,we propose the perspectives of g-C_(3)N_(4)decorated with silver on photocatalytic *** hope that this review will shed some light on the photocatalytic energy conversion of g-C_(3)N_(4)decorated with silver.

关键词： g-C_(3)N_(4) Silver-modified g-C_(3)N_(4) Photocatalytic energy conversion H_(2)evolution Pollutant degradation CO_(2)reduction

Underwater Image Classification Based on EfficientnetB0 and Two-Hidden-Layer Random Vector Functional Link

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Journal of Ocean University of China 2024年第2期23卷 392-404页

作者： ZHOU Zhiyu LIU Mingxuan JI haodong WANG Yaming ZHU Zefei School of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Key Laboratory of DDIMCCP Lishui UniversityLishui 323000China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

The ocean plays an important role in maintaining the equilibrium of Earth’s ecology and providing humans access to a wealth of *** obtain a high-precision underwater image classification model,we propose a classification model that combines an EfficientnetB0 neural network and a two-hidden-layer random vector functional link network(EfficientnetB0-TRVFL).The features of underwater images were extracted using the EfficientnetB0 neural network pretrained via ImageNet,and a new fully connected layer was trained on the underwater image dataset using the transfer learning *** learning ensures the initial performance of the network and helps in the development of a high-precision classification ***,a TRVFL was proposed to improve the classification property of the *** construction of the two hidden layers exhibited a high accuracy when the same hidden layer nodes were *** parameters of the second hidden layer were obtained using a novel calculation method,which reduced the outcome error to improve the performance instability caused by the random generation of parameters of ***,the TRVFL classifier was used to classify features and obtain classification *** proposed EfficientnetB0-TRVFL classification model achieved 87.28%,74.06%,and 99.59%accuracy on the MLC2008,MLC2009,and Fish-gres datasets,*** best convolutional neural networks and existing methods were stacked up through box plots and Kolmogorov-Smirnov tests,*** increases imply improved systematization properties in underwater image classification *** image classification model offers important performance advantages and better stability compared with existing methods.

关键词： underwater image classification EfficientnetB0 random vector functional link convolutional neural network

Simulation of an aircraft thermal management system based on vapor cycle response surface model

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Chinese Journal of Aeronautics 2024年第6期37卷 64-77页

作者： haodong LIU Hongsheng JIANG Sujun DONG Longxian XUE Yongji LIU Jianjun WU School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Chengdu Aircraft Design and Research Institute Aviation Industry Corporation of ChinaChengdu 610091China

The modern aircraft Thermal Management System(TMS)faces significant challenges due to increasing thermal loads and limited heat dissipation *** optimize TMS during the conceptual design stage,the development of a modeling and simulation tool is *** this study,a TMS simulation model library was created using MATLAB/*** simplify the complexity of the Vapor Cycle System(VCS)model,a Response Surface Model(RSM)was constructed using the Monte Carlo method and validated through simulation *** the F-22 fighter TMS as an example,a thermal dynamic simulation model was constructed to analyze the variation of thermal response parameters in key subsystems and elucidate their coupling ***,the impact of total fuel flow and ram air flow on the TMS was *** findings demonstrate the existence of an optimal total fuel flow that achieves a balance between maximizing fuel heat sink utilization and minimizing bleed air *** adaptive distribution of fuel and ram air flow was found to enhance aircraft thermal management *** study contributes to improving modeling efficiency and enhancing the understanding of the thermal dynamic characteristics of TMS,thereby facilitating further optimization in aircraft TMS design.

关键词： Thermal management sys-tem Vaporcycle Response surface model Dynamic simulation MonteCarlo