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6th International Conference on Electronics Technology, ICET 2023

作者： Zhen, Jiubao Huang, Shufan jia, xuwen Du, Haocheng China Agricultural University College of Information and Electrical Engineering Beijing100083 China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan250061 China

ISBN: (纸本)9798350337693

Virtual synchronous generator is used to control independent microgrid to provide inertia and damping support, but it often brings transient stability problems. Due to the large number of nonlinear and non-smooth characteristics of highly electronic independent microgrid, it is difficult to analyze it by the traditional transient stability analysis method. In this paper, the independent microgrid controlled by virtual synchronization is taken as the object. Firstly, we compare the impact of detailed modeling of energy storage and simplified modeling on the transient stability, and then discuss the impact of current limiting link of virtual synchronous machine on the transient stability. Secondary, combined with the idea of graph neural network, we propose an independent microgrid transient stability evaluation model based on message passing graph neural network. The information corresponding to bus and transmission lines in microgrid is aggregated and updated by message passing mechanism, so as to depict the topological connection relationship of microgrid, and then consider the influence of topology structure on transient stability evaluation. Last, a WSCC-9 system with virtual synchronous machine is taken as an example. The results show that considering the energy storage detailed model and current limiting link can effectively improve the accuracy of stability analysis. The proposed method has stronger generalization ability and is more applicable to the microgrid system with variable topological structure. © 2023 IEEE.

关键词： Stability

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Transient Stability Evaluation of Independent Microgrid based on Message Passing Graph Neural Network

Transient Stability Evaluation of Independent Microgrid base...

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International Conference on Electronics Technology (ICET)

作者： Jiubao Zhen Shufan Huang xuwen jia Haocheng Du College of Information and Electrical Engineering China Agricultural University Beijing China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

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Review of dataset and algorithms for distribution network pseudo measurement

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Energy Internet 2024年第0期

作者： Yuntao Ju xuwen jia Biqing Wang North China University of Technology Beijing China Shanxi Energy Internet Research Institute Taiyuan Shanxi China

Pseudo-measurement production of distribution networks is an important technology for ensuring the visibility of distribution networks. The paper discusses the concept of pseudo-metrics, databases, algorithms, and applications in practical engineering. Firstly, the basic concept of Pseudo-measurement of the distribution network is introduced. Subsequently, various pseudo-measurement databases and algorithms are discussed in detail, and the advantages and limitations of these methods in dealing with the historical and operational data of medium-voltage pseudo-measurement distribution networks are compared and analysed. Then, the main application of pseudo-measurement is analysed. Finally, the main challenges in the field of pseudo-measurement of the distribution networks are discussed, such as data quality, computational complexity, model accuracy, and feasibility in practical application. The development direction of future research is envisaged.

关键词： big data distribution networks energy Internet

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A CHARACTERIZATION OF CAPILLARY SPHERICAL CAPS BY A PARTIALLY OVERDETERMINED PROBLEM IN A HALF BALL

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PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY 2025年第1期153卷 161-170页

作者： jia, Xiaohan Lu, Zheng Xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing 211189 Peoples R China Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Albert Ludwigs Univ Freiburg Math Inst D-79104 Freiburg Germany Goethe Univ Inst Math D-60325 Frankfurt Germany Univ Freiburg Math Inst Ernst Zermelo Str1 D-79104 Freiburg Germany

In this paper, we study a Serrin-type partially overdetermined problem proposed by Guo-Xia [Calc. Var. Partial Differential Equations (2019), Paper No. 160, 15], and prove a rigidity result that characterizes capillar... 详细信息

关键词： Key words and phrases. Serrin's overdetermined problem mixed boundary value problem capillary hypersurfaces. capillary hypersurfaces

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Online analysis of iron ore slurry using PGNAA technology with artificial neural network

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NUCLEAR ENGINEERING AND TECHNOLOGY 2024年第7期56卷 2835-2841页

作者： Huang, Haolong Cai, Pingkun Liang, xuwen jia, Wenbao Nanjing Univ Aeronaut & Astronaut Dept Nucl Sci & Technol Nanjing 211106 Peoples R China Collaborat Innovat Ctr Radiat Med Jiangsu Higher E Suzhou 215000 Peoples R China

Real-time analysis of metallic mineral grade and slurry concentration is significant for improving flotation efficiency and product quality. This study proposes an online detection method of ore slurry combining the Prompt Gamma Neutron Activation Analysis (PGNAA) technology and artificial neural network (ANN), which can provide mineral information rapidly and accurately. Firstly, a PGNAA analyzer based on a D-T neutron generator and a BGO detector was used to obtain a gamma-ray spectrum dataset of ore slurry samples, which was used to construct and optimize the ANN model for adaptive analysis. The evaluation metrics calculated by leave-one-out cross-validation indicated that, compared with the weighted library least squares (WLLS) approach, ANN obtained more precise and stable results, with mean absolute percentage errors of 4.66% and 2.80% for Fe grade and slurry concentration, respectively, and the highest average standard deviation of only 0.0119. Meanwhile, the analytical errors of the samples most affected by matrix effects was reduced to 0.61 times and 0.56 times of the WLLS method, respectively.

关键词： Mineral grade Slurry concentration Online detection Prompt gamma neutron activation analysis Artificial neural network

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Willmore-type inequality in unbounded convex sets

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JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES 2025年第3期111卷

作者： jia, Xiaohan Wang, Guofang Xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing Peoples R China Univ Freiburg Math Inst Ernst Zermelo Str1 D-79104 Freiburg Germany Xiamen Univ Sch Math Sci Xiamen Peoples R China

In this paper, we prove the following Willmore-type inequality: on an unbounded closed convex set K subset of Rn+1$K\subset \mathbb {R}{n+1}$ (n >= 2$(n\geqslant 2$), for any embedded hypersurface Sigma subset of K...

In this paper, we prove the following Willmore-type inequality: on an unbounded closed convex set K subset of Rn+1$K\subset \mathbb {R}<^>{n+1}$ (n >= 2$(n\geqslant 2$), for any embedded hypersurface Sigma subset of K${\Sigma }\subset K$ with boundary partial derivative Sigma subset of partial derivative K$\partial {\Sigma }\subset \partial K$ satisfying a certain contact angle condition, there holds 1n+1 integral Sigma HndA >= AVR(K)|Bn+1|.$$\begin{equation*} {\frac{1}{n+1}\int _{{\Sigma }}{\left|{H}\right|}<^>n d A\geqslant \rm AVR}(K)\vert \mathbb {B}<^>{n+1}\vert . \end{equation*}$$Moreover, equality holds if and only if Sigma${\Sigma }$ a part of a sphere and K\Omega$K\setminus \Omega$ is a part of the solid cone determined by Sigma${\Sigma }$. Here, Omega$\Omega$ is the bounded domain enclosed by Sigma${\Sigma }$ and partial derivative K$\partial K$, H$H$ is the normalized mean curvature of Sigma${\Sigma }$, and AVR(K)${\rm AVR}(K)$ is the asymptotic volume ratio of K$K$. We also prove an anisotropic version of this Willmore-type inequality. As a special case, we obtain a Willmore-type inequality for anisotropic capillary hypersurfaces in a half-space.

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Rigidity and quantitative stability for partially overdetermined problems and capillary CMC hypersurfaces

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CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS 2024年第5期63卷 125-125页

作者： jia, Xiaohan Lu, Zheng Xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing 211189 Peoples R China Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Albert Ludwigs Univ Freiburg Math Inst D-79104 Freiburg Im Breisgau Germany Goethe Univ Inst Math D-60325 Frankfurt Germany

In this paper, we first prove a rigidity result for a Serrin-type partially overdetermined problem in the half-space, which gives a characterization of capillary spherical caps by the overdetermined problem. In the second part, we prove quantitative stability results for the Serrin-type partially overdetermined problem, as well as capillary almost constant mean curvature hypersurfaces in the half-space.

关键词： 35N25 53A10 35B35 35A23

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Microstructure, mechanical and neutron shielding properties of aluminum borate ceramics obtained from alumina and boric acid

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JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY 2024年第3期60卷 905-915页

作者： Lao, Dong Zhang, Yan Huang, Lingfeng Liang, xuwen jia, Wenbao Nanjing Univ Aeronaut & Astronaut NUAA Dept Nucl Sci & Technol Nanjing 211106 Peoples R China East China Univ Technol Engn Res Ctr Nucl Technol Applicat Minist Educ Nanchang 330013 Peoples R China Jiangsu Higher Educ Inst Collaborat Innovat Ctr Radiat Med Suzhou 215006 Peoples R China

In this study, a series of aluminum borate ceramics (ABCs) with needle-like whiskers were obtained using a low-cost, solid-state, pressureless sintering ceramic route, without any additives during the preparation process. The effects of different alumina/boric acid molar ratios and sintering temperatures on the phase composition, microstructure, mechanical properties, specific surface area, pore size distribution, and sub-cadmium neutron shielding properties of ABCs were studied using orthogonal experiments. It was observed that pure phase aluminum borate (Al18B4O33) ceramics could be obtained at 1100 degree celsius, forming a mass of needle-like whiskers. The whiskers' aspect ratio, fracture work, specific surface area, and pore size distribution of ABCs are maximized when ABCs are sintered at 1100 degree celsius with 9:6 alumina/boric acid molar ratio. In this condition, ABCs (0.5 cm) can shield 70% of sub-cadmium neutrons (E<0.4 eV). These findings demonstrate the great potential of aluminum borate ceramics for neutron shielding applications.

关键词： Aluminum borates ceramics (ABCs) Solid-state reaction synthesis Al18B4O33 whiskers Mechanical properties Sub-cadmium neutron shielding capacity

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一种基于Spark的公路裂缝图像处理方法

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计算机与数字工程 2022年第8期50卷 1795-1801页

作者：李杨刘庆华刘东华黄凯枫贾叙文江苏科技大学镇江212000

随着公路修建里程增长,为了更高效率地解决路面养护问题,对路面裂缝检测技术进行研究。论文将传统的图像分割处理与Spark结合,提出了一种基于Spark的路面裂缝图像分割处理方法。先将图像预处理转化为二进制文件,读入到分布式文件系统;... 详细信息

随着公路修建里程增长,为了更高效率地解决路面养护问题,对路面裂缝检测技术进行研究。论文将传统的图像分割处理与Spark结合,提出了一种基于Spark的路面裂缝图像分割处理方法。先将图像预处理转化为二进制文件,读入到分布式文件系统;然后通过传递函数,对裂缝进行图像分割来获得裂缝区域;最后,以局部自适应阈值算法结合Spark平台来进行图像的并行处理,完成裂缝的高效率提取。以在校园拍摄的路面图像数据为实验数据,分别在处理时间和检测准确率这两方面进行实验。由结果可知:利用Spark对数千张图像数据进行计算时,在确定千余张图像数据规模时,双节点比单节点处理时间更少,最多减少了20.4%。在图像分割的准确率方面,已经由之前方法的47.5%提高到了86.3%。实验结果表明,基于Spark的裂缝图像处理,结合局部自适应阈值分割算法进行数千张裂缝图像分割,能有效提升传统方法的处理效率,能实现大规模图像的并行处理。

关键词：公路裂缝图像处理 Spark 并行处理大数据局部自适应阈值分割

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Alexandrov's Theorem for Anisotropic Capillary Hypersurfaces in the Half-Space

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ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS 2023年第2期247卷 1-19页

作者： jia, Xiaohan Wang, Guofang Xia, Chao Zhang, xuwen Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Univ Freiburg Math Inst Ernst Zermelo Str 1 D-79104 Freiburg Germany

In this paper, we show that any embedded capillary hypersurface in the half-space with anisotropic constant mean curvature is a truncated Wulff shape. This extends Wente's result (Pac J Math 88:387-397, 1980. ) to the anisotropic case and He-Li-Ma-Ge's result (Indiana Univ Math J 58(2):853-868, 2009. ) to the capillary boundary case. The main ingredients in the proof are a new Heintze-Karcher inequality and a new Minkowski formula, which have their own interest.

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