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Integrating single Ni site and PtNi alloy on two-dimensional porous carbon nanosheet for efficient catalysis in fuel cell

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Nano Research 2024年第8期17卷 6916-6921页

作者： Fangyao Zhou Yaner Ruan Feng Li Lin Tian mengzhao Zhu Wenan Tie Xiaoyan Tian Bo Wang Peigen Liu Jie Xu Xiaoping Gao Peng Li Huang Zhou Yuen Wu Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Shanxi Yanchang Petroleum(Group)Co.Ltd. Xian 710065China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035China

The performance of catalyst depends on the intrinsic activity of active sites and the structural characteristics of the ***,we simultaneously integrate single nickel(Ni)sites and platinum-nickel(PtNi)alloy nanoparticles(NPs)on a two-dimensional(2D)porous carbon nanosheet,demonstrating remarkable catalytic performance in the oxygen reduction reaction(ORR).The single Ni sites can activate the oxygen molecules into key oxygen-containing intermediate that is further efficiently transferred to the adjacent PtNi alloy NPs and rapidly reduced to H_(2)O,which establishes a relay catalysis between active *** porous structure on the carbon nanosheet support promotes the transfer of active intermediates between these active sites,which assists the relay catalysis by improving mass ***,the obtained catalyst demonstrates a half-wave potential of up to 0.942 V,a high mass activity of 0.54 A·mgPt^(−1),and negligible decay of activity after 30,000 cycles,which are all superior to the commercial Pt/C catalysts with comparable loading of *** theoretical calculation results reveal that the obtained catalyst with defect structure of carbon support presents enhanced relay catalytic effect of PtNi alloy NPs and single Ni sites,ultimately realizing improved catalytic *** work provides valuable inspiration for developing low platinum loading catalyst,integrating single atoms and alloy with outstanding performance in fuel cell.

关键词： two-dimensional porous carbon nanosheet Pt-based alloy single atom catalysts relay effect proton-exchange membrane fuel cells

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SVM结合模糊方法在遥感图像分类中的应用

计算机工程与应用 2005年第36期41卷 79-82页

作者：许磊李朝峰杨蒙召江南大学信息工程学院江苏无锡214122

提出一种支持向量机(SVM)结合模糊方法的遥感图像分类算法。首先介绍了SVM基本算法及其在遥感图像分类中应用情况,然后针对SVM多类判别存在混分和漏分的缺陷,对混分和漏分样本采用模糊方法判决分类。实验证明该方法的分类精度优于单一的... 详细信息

提出一种支持向量机(SVM)结合模糊方法的遥感图像分类算法。首先介绍了SVM基本算法及其在遥感图像分类中应用情况,然后针对SVM多类判别存在混分和漏分的缺陷,对混分和漏分样本采用模糊方法判决分类。实验证明该方法的分类精度优于单一的SVM方法、模糊方法或神经网络方法。

关键词：支持向量机模糊隶属度遥感图像分类

基于改进凸包算法的船舶巡航预警快速监测研究

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计算机应用研究 2018年第11期35卷 3243-3245,3258页

作者：黄冬梅杨建郑小罗杨蒙召上海海洋大学信息学院上海201306

海洋维权巡航执法已成为维护我国海洋主权的常规手段。为避免大风、大浪对船舶造成损失,在维权保障平台建设中,提出了一种基于改进凸包算法的船舶巡航预警快速监测方法。根据每日更新的监测数据,筛选出危险点集,利用改进的凸包算法将所... 详细信息

海洋维权巡航执法已成为维护我国海洋主权的常规手段。为避免大风、大浪对船舶造成损失,在维权保障平台建设中,提出了一种基于改进凸包算法的船舶巡航预警快速监测方法。根据每日更新的监测数据,筛选出危险点集,利用改进的凸包算法将所有预警点参与危险区域的构建。实验结果表明,该方法能够高效、精确地标志出船舶未来可能航行到的危险区域。提高了船舶巡航监测在航率,保证巡航的安全和监测任务的有效进行。

关键词：船舶巡航预警凸包算法在航率

Vibration properties of Paulownia wood for Ruan sound quality using machine learning methods

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JOURNAL OF FORESTRY RESEARCH 2024年第1期35卷 1-7页

作者： yang, yang Harbin Univ Coll Art & Design Harbin 150076 Peoples R China Northeast Forestry Univ Coll Mech & Elect Engn Harbin 150040 Peoples R China

As an important material for manufacturing resonant components of musical instruments, Paulownia has an important influence on the sound quality of Ruan. In this paper, a model for evaluating the sound quality of Ruan based on the vibration characteristics of wood is developed using machine learning methods. Generally, the selection of materials for Ruan manufacturing relies primarily on manually weighing, observing, striking, and listening by the instrument technician. Deficiencies in scientific theory have hindered the quality of the finished Ruan. In this study, nine Ruans were manufactured, and a prediction model of Ruan sound quality was proposed based on the raw material information of Ruans. Out of a total of 180 data sets, 145 and 45 sets were chosen for training and validation, respectively. In this paper, typical correlation analysis was used to determine the correlation between two single indicators in two adjacent pairwise combinations of the measured objects in each stage of the production process in Ruan. The vibration characteristics of the wood were tested, and a model for predicting the evaluation of Ruan's acoustic qualities was developed by measuring the vibration characteristics of the resonating plate material. The acoustic quality of the Ruan sound board wood was evaluated and predicted using machine learning model generalized regression neural network. The results show that the prediction of Ruan sound quality can be achieved using Matlab simulation based on the vibration characteristics of the soundboard wood. When the model-predicted values were compared with the traditional predicted results, it was found that the generalized regression neural network had good performance, achieving an accuracy of 93.8% which was highly consistent with the experimental results. It was concluded that the model can accurately predict the acoustic quality of the Ruan based on the vibration performance of the soundboards.

关键词： Sound quality Wood vibration performance Paulownia wood Machine learning methods YOUNGS MODULUS INTERNAL-FRICTION PREDICTION

Fresh-Keeping Decision and Coordination of Fresh Agricultural Product Supply Chain Considering Carbon Cap-and-Trade under Different Dominance

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Journal of Systems Science and Systems Engineering 2024年第1期33卷 30-51页

作者： yang yang Guanxin Yao China Institute for Agricultural Equipment Industrial Development Jiangsu UniversityZhenjiang212013China Jiangsu Modern Logistics Research Base Yangzhou UniversityYangzhou225009China

In the context of low carbon,this paper discussed the impact of the carbon cap-and-trade policy on the fresh-keeping decision-making of two-echelon fresh agricultural product supply chains under different dominance,and designed cost-sharing contracts to coordinate the supply chain of fresh agricultural products dominated by suppliers and retailers *** results showed that:dominance has no effect on the fresh-keeping decision and total revenue of fresh agricultural product supply chain,but it affects the internal income distribution,and dominance does not always bring more benefits;the implementation of carbon cap-and-trade reduces the fresh-keeping decision-making of fresh agricultural products supply chain and reduces the free-rider income of followers;the role of higher carbon trading price is twofold,which not only brings about the speculation of leading enterprises,but also promotes the application of low-carbon technologies;consumers’high preference for freshness,low-cost and high-efficiency low-carbon technology are all conducive to improving the fresh-keeping efforts and benefits of the supply chain;cost-sharing contracts can coordinate the supply chain of fresh agricultural products.

关键词： Dominant power carbon cap-and-trade policy fresh agricultural product supply chain fresh-keeping decision-making

Overview of radar detection methods for low altitude targets in marine environments

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Journal of Systems Engineering and Electronics 2024年第1期35卷 1-13页

作者： yang Yong yang Boyu School of Electronic Science National University of Defense TechnologyChangsha 410073China

In this paper,a comprehensive overview of radar detection methods for low-altitude targets in maritime environments is presented,focusing on the challenges posed by sea clutter and multipath *** performance of the radar detection methods under sea clutter,multipath,and combined conditions is categorized and summarized,and future research directions are outlined to enhance radar detection performance for low-altitude targets in maritime environments.

关键词： radar sea clutter multipath scattering detection low altitude target

基于HVS和模糊隶属度函数的卫星图像融合算法

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测绘信息与工程 2011年第1期36卷 34-36页

作者：陈晓梅李朝锋杨蒙召江南大学商学院江南大学信息工程学院无锡市蠡湖大道1800号214122

提出了一种基于人类视觉系统和模糊隶属度函数的小波卫星图像融合新算法,利用小波域的人类视觉系统经验模型,刻画图像的边缘、纹理及高亮区域,采用模糊隶属度函数自适应地计算权系数,在小波域上通过加权平均实现了图像融合。

关键词：小波变换人类视觉系统模糊隶属度卫星图像融合

Selective nano-buckling improves the performance of graphene logic transistors

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National Science Review 2024年第2期11卷 95-96页

作者： Tong yang Ming yang Department of Applied Physics The Hong Kong Polytechnic University Research Centre for Nanoscience and Nanotechnology The Hong Kong Polytechnic University

The massive integration of silicon-based transistors into modern electronic devices greatly increases power consumption and heat generation/dissipation[1]. In this concern, transistors based on atomically-thin graphene that exhibit high electric and thermoelectric conductivities with negligible contact resistance,

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Design Optimization and Operating Performance of S-CO_(2) Brayton Cycle under Fluctuating Ambient Temperature and Diverse Power Demand Scenarios

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Journal of Thermal Science 2024年第1期33卷 190-206页

作者： yang Jingze yang Zhen DUAN Yuanyuan Key Laboratory for Thermal Science and Power Engineering of MOE Beijing Key Laboratory for CO_(2) Utilization and Reduction TechnologyTsinghua UniversityBeijing 100084China

The supercritical CO_(2)(S-CO_(2)) Brayton cycle is expected to replace steam cycle in the application of solar power tower system due to the attractive potential to improve efficiency and reduce *** the concentrated solar power plant with thermal energy storage is usually located in drought area and used to provide a dispatchable power output,the S-CO_(2) Brayton cycle has to operate under fluctuating ambient temperature and diverse power demand *** addition,the cycle design condition will directly affect the off-design *** this work,the combined effects of design condition,and distributions of ambient temperature and power demand on the cycle operating performance are analyzed,and the off-design performance maps are proposed for the first time.A cycle design method with feedback mechanism of operating performance under varied ambient temperature and power demand is introduced *** show that the low design value of compressor inlet temperature is not conductive to efficient operation under low loads and sufficient output under high ambient *** average yearly efficiency is most affected by the average power demand,while the load cover factor is significantly influenced by the average ambient *** multi-objective optimization,the optimal solution of designed compressor inlet temperature is close to the minimum value of35℃ in Delingha with low ambient temperature,while reaches 44.15℃ in Daggett under the scenario of high ambient temperature,low average power demand,long duration and large value of peak load during the peak temperature *** the cycle designed with compressor inlet temperature of 35℃ instead of 44.15℃ in Daggett under light industry power demand,the reduction of load cover factor will reach 0.027,but the average yearly efficiency can barely be improved.

关键词： supercritical CO_(2)Brayton cycle ambient temperature fluctuating power demand scenarios design optimization off-design performance