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Global Probabilistic Voltage Sensitivity Analysis of Active Distribution Networks Based on the Compound Gaussian Mixture Model

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Dianwang Jishu/Power System Technology 2025年第1期49卷 295-305页

作者： Zhang, Ren Wang, Jian Shang, Jie hai, chen Liu, Haoming School of Electrical and Power Engineering Hohai University Jiangsu Province Nanjing 211100 China College of Artificial Intelligence and Automation Hohai University Jiangsu Province Nanjing 211100 China

The stochasticity of the high penetration of distributed generations (DGs) exacerbates the voltage fluctuation of the active distribution networks (ADNs) and complicates its voltage safety analysis. Therefore, this paper proposes a global probability voltage sensitivity analysis method based on the compound Gaussian mixture model (GMM). Firstly, a shared node path impedance-based global voltage sensitivity analytical model of ADN is derived to quantify the impact of global power fluctuations on node voltage. Considering that the voltage fluctuation has the non-Gaussian characteristic under the superposition influence of power uncertainty injected by multiple nodes, the GMM is used to characterize the probability characteristics of DG and load forecasting errors. Then, based on the affine transformation of the global sensitivity matrix to the GMM of DG and load forecasting error, the probability analytic expression of the voltage fluctuation is constructed, which is caused by the uncertainty of DG and load. Finally, based on the GMM characteristic function, the compound GMM characteristic function of the combined influence of the uncertainty of DG and load on voltage fluctuation is derived, and the global probabilistic voltage sensitivity analysis model based on the compound GMM is established. The case study results show that the proposed method can reflect the probability characteristics of the impact of all node power fluctuations on node voltage, and can quickly and accurately calculate the probability of over-voltage in ADNs. © 2025 Power System Technology Press. All rights reserved.

关键词： Affine transforms

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自旋-轨道耦合作用下极化激元凝聚中的调制不稳定性

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原子与分子物理学报 2025年第6期42卷 136-143页

作者：陈海军陇东学院物理系庆阳745000

利用线性稳定性分析方法,对存在自旋-轨道耦合(SOS)作用的二维极化激元玻色-爱因斯坦凝聚(BEC)系统中的调制不稳定性(MI)进行了研究.分析了组分内部,组分之间以及SOC相互作用对系统调制不稳定性的影响.结果显示,当系统内部不存在SOC作用... 详细信息

利用线性稳定性分析方法,对存在自旋-轨道耦合(SOS)作用的二维极化激元玻色-爱因斯坦凝聚(BEC)系统中的调制不稳定性(MI)进行了研究.分析了组分内部,组分之间以及SOC相互作用对系统调制不稳定性的影响.结果显示,当系统内部不存在SOC作用,组分之间的相互作用为0,组分内部存在排斥作用时,不会出现调制不稳定性,组分内部存在吸引作用时,会出现调制不稳定性,并且调制不稳定性区间长度随吸引作用的增强而增加;组分之间相互作用不为0时,组分之间的相互作用以平方形式出现,其正负不会对调制不稳定性产生实质性影响.存在SOC相互作用时,SOC相互作用会引起增益谱曲线的不规则振荡,破坏原来的调制不稳定性区间.

关键词：极化激元凝聚调制不稳定性自旋-轨道耦合双分量

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Metastable seed-crystals: epitaxial growth of branched-array organic heterostructure nanowires

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Science China Chemistry 2025年

作者： Jin Feng Zhen-Yu Geng Ting-Yao Song Ying-Xin Ma Chuan-Zeng Wang Wei Zhang Hong-Tao Lin Jin Zhou Shu-Ping Zhuo Shu-hai chen Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University College of Chemistry and Chemical Engineering Hunan Normal University

Tunable light–matter interactions are exhibited by organic low-dimensional crystals, making these crystals a promising platform for organic photonics. However, the precise synthesis of organic low-dimensional crystals remains challenging due to the stochastic nature of molecular nucleation processes. Herein, the directed nucleation process is driven by the introduction of metastable seed-crystals as the trunk, which ultimately leads to branched-array organic heterostructures. The successful formation of organic heterostructures with high-density branched arrays is attributed to the highest attachment energy (Eatt（023）=-104.25 kcal mol-1) of the exposed （023） crystal plane during the seed-crystal growth route. Significantly, these as-prepared heterostructures inherently have an ultralow lattice mismatch ratio η of 0.7%between trunk and branch, which contributes to the multi-channel photon transportation. Therefore, this work provides valuable insights into a versatile synthetic strategy for accessing low-dimensional heterostructures for integrated optoelectronics.

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替罗非班在急性脑梗死介入治疗中的应用效果

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中国医药指南 2025年第1期23卷 138-140页

作者：陈海松原市中心医院神经内科吉林松原138000

目的分析急性脑梗死(CI)患者实施介入治疗期间应用替罗非班的效果。方法将2022年11月至2023年11月本院50例符合介入治疗指征的CI患者,采取随机数字表法分组的方式,将患者划分至对照组(25例,仅实施介入治疗)与试验组(25例,于对照组基础... 详细信息

目的分析急性脑梗死(CI)患者实施介入治疗期间应用替罗非班的效果。方法将2022年11月至2023年11月本院50例符合介入治疗指征的CI患者,采取随机数字表法分组的方式,将患者划分至对照组(25例,仅实施介入治疗)与试验组(25例,于对照组基础上予以替罗非班治疗),对比两组治疗效果、神经功能、日常生活能力、炎症因子水平、血液流变学指标、血管内皮功能指标、并发症总发生率等研究数据。结果治疗后,试验组低切全血黏度与纤维蛋白原水平,美国国立卫生研究院卒中量表评分以及并发症总发生率均低于对照组(均P<0.05)。治疗后,生活能力评估表评分和治疗总有效率均高于对照组(均P<0.05)。治疗后,试验组肿瘤坏死因子α、白细胞介素6、白细胞介素8、内皮素1指标水平均低于对照组,一氧化氮水平高于对照组(均P<0.05)。结论罗非班治有助于改善CI患者的整体预后,避免因脑神经功能缺损等情况以降低生活能力,降低炎症因子水平,改善血液流变学及血管内皮指标,减少并发症发生。

关键词：急性脑梗死介入治疗替罗非班治疗总有效率

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Possibility of Searching for Accreting White Dwarfs with the Chinese Space Station Telescope

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Research in Astronomy and Astrophysics 2022年第5期22卷 21-27页

作者： Wei Xie hai-Liang chen Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of the Chinese Academy of Sciences Beijing 100049China

Accreting WDs are very important for the studies of binary evolution,binary population synthesis and accretion *** far,there are a lot of accreting WD binaries with low accretion rates,such as cataclysmic variables,detected by different ***,few accreting WD binaries with high accretion rates have been *** this paper,we studied the spectrum properties of accreting WD binaries and investigated whether accreting WD binaries with high accretion rates can be detected by the Chinese Space Station Telescope(CSST).We found that some accreting WD binaries with high accretion rates can be distinguishable from other types of stars with(NUV-y,u-y),(NUV-r,u-g),(NUV-i,u-g),(NUV-z,u-g)and(NUV-y,u-g)color-color ***,some accreting WD binaries with high accretion rates can be detected by the CSST.

关键词： white dwarf stars whitedwarfs-binarystars close binarystars-low massstars low-massstar

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PSG： a two-layer graph model for document summarization

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Frontiers of Computer Science 2014年第1期8卷 119-130页

作者： Heng chen hai JIN Feng ZHAO Service Computing Technology and System Lab & Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Graph model has been widely applied in docu- ment summarization by using sentence as the graph node, and the similarity between sentences as the edge. In this paper, a novel graph model for document summarization is presented, that not only sentences relevance but also phrases relevance information included in sentences are utilized. In a word, we construct a phrase-sentence two-layer graph structure model （PSG） to summarize document（s） . We use this model for generic document summarization and query-focused sum- marization. The experimental results show that our model greatly outperforms existing work.

关键词： relationship graph Markov random walk doc-ument summarization

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Characterization of thermal-induced distorted face-centered cubic structure in pure titanium

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Journal of Iron and Steel Research International 2019年第6期26卷 653-658页

作者： hai-chen Wu Xiao-fang Bi School of Materials Science and Engineering Beihang University Beijing 100191 China

After 900 ℃ high-vacuum annealing and air cooling, a special band was observed in pure titanium. Energy-dispersive spectrum showed that the composition of the band and the matrix is the same. By tilting the band to different zone axes and taking selected-area electron diffraction (SAED) patterns, we found that the structure of the band is distorted face-centered cubic (fcc) with the lattice constants a, b, and c deviating slightly from each other on the basis of the analyses of the SAED patterns together with the tilting angles. The lattice constants a, b, and c are calculated based on the measurement of interplanar spacing according to high-resolution transmission electron microscopy (HRTEM) images. The orientation relation between the hexagonal-close-packed (hcp) matrix and the distorted fcc band is [11(2)0]hcp//[110]fcc and (0001)hcp//(1(1)1)fcc according to SAED analysis. The phase boundary between the matrix and the band was observed to demonstrate serrated configuration composed of two kinds of micro-steps: ((1)11)//(0002) and ((1)11)//(10(1)1) on the basis of Cs-corrected HRTEM characterization. The distorted fcc band is deduced to be a thermal-induced metastable phase transformed from the high-temperature body-centered cubic (bcc) structure during the allotropic transformation from bcc to hcp based on orientation relation analysis.

关键词： Titanium Transmission electron microscopy Distorted fee Phase boundary Formation mechanism

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Dual-wavelength dual-indicator catalytic kinetic spectrophotometry for determination of trace Ru(Ⅲ)

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Rare Metals 2013年第6期32卷 605-608页

作者： hai-Yan chen Yu-Jing chen Ming Zhang School of Chemistry and Chemical Engineering Yangzhou University Department of Chemical Engineering Yangzhou Polytechnic InstituteYangzhou 225127 China School of Chemistry and Materials Science Ludong University

A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace Ru(III)was *** method was based on Ru(III)-catalyzing oxidation of Arsenazo I and indigo carmine by potassium bromate in sulfuric *** absorbances of the catalytic and noncatalytic systems were measured at 510 and610 nm,*** the optimum conditions,the linear range of determination is 0–0.12 lgáml-1and the detection limit is 1.21 9 10-4lgá*** method was applied for the determination of trace Ru(III)in ore samples with satisfactory results.

关键词： Dual-wavelength Catalytic spectrophotometry Ru(III) Arsenazo I Indigo carmine

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A wideband fast multipole boundary element method for half-space/plane-symmetric acoustic wave problems

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Acta Mechanica Sinica 2013年第2期29卷 219-232页

作者： Chang-Jun Zheng hai-Bo chen Lei-Lei chen Department of Modern Mechanics University of Science and Technology of China

This paper presents a novel wideband fast multipole boundary element approach to 3D half-space/planesymmetric acoustic wave *** half-space fundamental solution is employed in the boundary integral equations so that the tree structure required in the fast multipole algorithm is constructed for the boundary elements in the real domain ***,a set of symmetric relations between the multipole expansion coefficients of the real and image domains are derived,and the half-space fundamental solution is modified for the purpose of applying such relations to avoid calculating,translating and saving the multipole/local expansion coefficients of the image *** wideband adaptive multilevel fast multipole algorithm associated with the iterative solver GMRES is employed so that the present method is accurate and efficient for both lowand high-frequency acoustic wave *** for exterior acoustic problems,the Burton-Miller method is adopted to tackle the fictitious eigenfrequency problem involved in the conventional boundary integral equation *** on the implementation of the present method are described,and numerical examples are given to demonstrate its accuracy and efficiency.

关键词： Helmholtz equation·Boundary element method·Half-space/plane-symmetric problem·Wideband fast multipole method·Noise barrier

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A Light-Weight Opportunistic Forwarding Protocol with Optimized Preamble Length for Low-Duty-Cycle Wireless Sensor Networks

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Journal of Computer Science & Technology 2017年第1期32卷 168-180页

作者： hai-Ming chen Li Cui Gang Zhou Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Computer Science College of William and Mary Williamsburg VA 23185 U.S.A.

In wireless sensor networks, sensed information is expected to be reliably and timely delivered to a sink in an ad-hoc way. However, it is challenging to achieve this goal because of the highly dynamic topology induced from asynchronous duty cycles and temporally and spatially varying link quality among nodes. Currently some opportunistic forwarding protocols have been proposed to address the challenge. However, they involve complicated mechanisms to determine the best forwarder at each hop, which incurs heavy overheads for the resource-constrained nodes. In this paper, we propose a light-weight opportunistic forwarding （LWOF） scheme. Different from other recently proposed opportunistic forwarding schemes, LWOF employs neither historical network information nor a contention process to select a forwarder prior to data transmissions. It confines forwarding candidates to an optimized area, and takes advantage of the preamble in low-power-listening （LPL） MAC protocols and dual-channel communication to forward a packet to a unique downstream node towards the sink with a high probability, without making a forwarding decision prior to data transmission. Under LWOF, we optimize LPL MAC protocol to have a shortened preamble （LWMAC）, based on a theoretical analysis on the relationship among preamble length, delivery probability at each hop, node density and sleep duration. Simulation results show that LWOF, along with LWMAC, can achieve relatively good performance in terms of delivery reliability and latency, as a receiver-based opportunistic forwarding protocol, while reducing energy consumption per packet by at least twice.

关键词： wireless sensor network low duty cycle low power listening opportunistic forwarding

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