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Service Restoration of Distribution Systems Under Distributed Generation Scenarios

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CSEE Journal of Power and Energy Systems 2016年第3期2卷 43-50页

作者： xianchao Huang Yu Yang Gareth A.Taylor North China Electric Power University Beijing 102206China Huadian Electric Power Research Institute Hangzhou 310030China Brunel Institute of Power Systems Brunel UniversityUKUB83PH

A novel extended network for service restoration optimization problem under distributed generation scenarios is presented in which the main network restoration and DG island restoration problems are integrated into a unified spanning-tree *** proposed technique is aimed to realize synchronous optimization of both main network and island restorations,and thus ensure the algorithms that are used find the global optimization solution.A fast loop-breaking technique is also proposed in this *** on the circuit-branch correlation matrix,the proposed technique can break the loops in the distribution systems through matrix operations that significantly improve calculation *** results verify the correctness and advantage of the proposed algorithms:the proposed integrated optimization strategy based on the extended network has better performance compared with a two-step restoration strategy;also,the proposed loop-breaking technique has faster calculation speed compared with prim algorithm and DFS based on adjacentmatrix.

关键词： Distributed generation distribution system extended network load shedding service restoration

面向临床医学专业的社会适应性教育实践体系探索

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科教文汇 2025年第1期 73-77页

作者：亓英国李昌玉李刚孟宪超山东第一医科大学附属人民医院脊柱外科山东济南271100 山东第一医科大学附属人民医院科教科山东济南271100 莱芜职业技术学院教务处山东济南271100

高等院校人才培养的适应性主要指社会适应性,即高等院校通过改革创新人才培养模式、课程体系等途径,使学生在面对复杂的社会环境时,通过调整自身以及顺应、利用和改造环境,增强自我与社会互动的能力,成为能够适应社会、与社会和他人和... 详细信息

高等院校人才培养的适应性主要指社会适应性,即高等院校通过改革创新人才培养模式、课程体系等途径,使学生在面对复杂的社会环境时,通过调整自身以及顺应、利用和改造环境,增强自我与社会互动的能力,成为能够适应社会、与社会和他人和谐相处的人。以山东第一医科大学跟岗与实习学生为研究样本,开展高等院校社会适应性教育实践,分析出相应的实践经验,形成具有推广价值的社会适应性教育课程体系,为增强新时代我国高等院校人才培养的社会适应性提供实践支撑。研究能为高职院校乃至普通本科院校开展社会适应性教育提供参考和借鉴,可以为当前高等院校人才培养模式改革、课程思政建设提供有益启示,还可以为教育主管部门制定政策文本提供参考。

关键词：社会适应性教育临床医学教学改革社会意义

Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces

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International Journal of Extreme Manufacturing 2022年第1期4卷 133-141页

作者： Tun Cao Meng Lian Kuan Liu xianchao Lou Yaoming Guo Dongming Guo School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalianPeople’s Republic of China Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China

Efficient thermal radiation in the mid-infrared(M-IR)region is of supreme importance for many applications including thermal imaging and sensing,thermal infrared light sources,infrared spectroscopy,emissivity coatings,and *** ability to control light makes metasurfaces an attractive platform for infrared ***,different metamaterials have been proposed to achieve high thermal *** date,broadening the radiation bandwidth of a metasurface emitter(meta-emitter)has become a key goal to enable extensive *** experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric(Si;N;)–metal(Au)stacks.A high thermal radiation can be obtained by engineering the geometry of nanocavity *** a meta-emitter provides wideband and broad angular absorptance of both p-and s-polarized light,offering a wideband thermal radiation with an average emissivity of more than 80%in the M-IR atmospheric window of 8–14μ*** experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters,which,as anticipated,will initiate a promising avenue to M-IR sources.

关键词： mid-infrared wideband perfect thermal radiation surface plasmon resonance metasurface nanocavity

Ladder Time Stepwise Inertia Coordinated Control Method of Multiple Wind Farms to Suppress System Frequency Secondary Drop

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Energy Engineering 2024年第8期121卷 2293-2311页

作者： He Li xianchao Liu Jidong Li Yuchen Qiu Tongliao PowerSupply Company State Grid East Inner Mongolia Electric Power CompanyTongliao028000China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Northeast Electric Power UniversityJilin132012China

Currently,both regulated and deregulated power trading exist in China’s power system,which has caused imbalanced funds in the electricity *** this paper,a simulation analysis of the electricity market with wind energy resources is conducted,and the calculation methods of unbalanced funds are investigated *** detail,the calculation formulas of unbalanced funds are illustrated based on their definition,and a two-track electricity market clearing model is ***,the concept of the dual-track system is explained,and the specific calculation formulas of various types of unbalanced funds are ***,considering the renewable energy consumption,the market clearing model based on DC power flow is constructed and solved;by combining fitting methods of mid-and long-term curves,the unbalanced funds are calculated based on clearing results and formulas.

关键词： Wind power stepwise inertial frequency control secondary drop

Effects of Heat Treatment and Nitrogen on Microstructure and Mechanical Properties of 1Cr12NiMo Martensitic Stainless Steel

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Journal of Materials Science & Technology 2012年第11期28卷 1059-1066页

作者： Ruicheng Fan Ming Gao Yingche Ma Xiangdong Zha xianchao Hao Kui Liu Institute of Metal Research Chinese/kcademy of SciencesShenyang 110016China

A series of heat treatments using the orthogonal experiment method were performed to study the microstruc- ture and mechanical properties of 1Cr12NiMo martensitic stainless steel containing various nitrogen content addition. The results indicate that the optimal heat treatment is annealing at 830 ℃ for 1 h, austenitizing at 985 ℃ for 1 h followed by oil quenching, and tempering at 630 ℃ for 4 h followed by air cooling, Nitrogen addition to 1Cr12NiMo steel can effectively hinder the austenite grain growth, refine the martensite lath, and increase the strength and hardness. The impact toughness of this steel only shows a minor decrease as the nitrogen content increases.

关键词： 1Cr12NiMo martensitic stainless steel Heat treatment Orthogonal design Nitrogen Mechanical properties

Effects of microstructure evolution on the deformation mechanisms and tensile properties of a new Ni-base superalloy during aging at 800℃

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Journal of Materials Science & Technology 2021年第9期68卷 40-52页

作者： Kunlei Hou Min Wang Meiqiong Ou Haoze Li xianchao Hao Yingche Ma Kui Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Tensile properties at room temperature of a new casting Ni-base superalloy during aging at 800℃ for0-1000 h were *** aging,granular M23C6 carbides presented at grain boundaries and kept growing from dispersed particles to continuous *** γ’ phase significantly coarsened,with the morphology of some γ’ phase changed from spherical to rounded cubic shape after 1000 *** deformation mechanisms in relation to the γ’ diameter(dγ’) were identified:(ⅰ) weakly coupled dislocations(WCD) connected by anti-phase boundary(APB) traveled in pair across the γ/γ’ structure when dγ’ was small in the under-aged alloys;(ⅱ) strongly coupled dislocations(SCD) with reduced spacing compared to(ⅰ) sheared γ’ phase when dγ’ increased in the over-aged alloys;(ⅲ) dislocations occasionally by-passed γ’ phase when dγ’ was larger than 97 nm after aging for more than 300 *** alloy obtained the peak strength when 20 h-aged with dγ’=44 nm which was in the transition between(ⅰ) and(ⅱ).The aginginduced variation in yield strength was correlated to the coarsening of γ’ phase using a theoretical model of precipitation strengthening in terms of the formation of *** calculated results suggested that the γ’ phase with a volume fraction of 23% contributed more than 61% of the peak-aged yield *** after fracture revealed that the alloys usually fractured at grain *** stress concentration around carbides resulted in cracks by carbides self-cracking and the initiation of *** undesirable agglomeration of M23C6 at grain boundaries was harmful to the properties of the overaged alloys.

关键词： Ni-base superalloy Aging γ’size Yield strength Deformation mechanism Fracture behavior

带径向进气腔室的轴流透平导叶周向非均匀分布研究

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储能科学与技术 2025年第1期14卷 203-218页

作者：许彬朱阳历王星熊军潘现超徐玉杰陈海生中国科学院工程热物理研究所北京100190 中国科学院大学北京100049 中科南京未来能源系统研究院江苏南京211135 毕节高新技术产业开发区国家能源大规模物理储能技术研发中心贵州毕节551712 江苏大学能源与动力工程学院江苏镇江212013

压缩空气储能系统透平径向进气腔室结构的存在会造成透平入口进气周向不均匀,导致透平性能下降。因此对压缩空气储能系统耦合径向进气腔室的单级轴流透平进行数值模拟,探究了导叶周向非均匀分布对透平等熵效率及其内部流场的影响机理。... 详细信息

压缩空气储能系统透平径向进气腔室结构的存在会造成透平入口进气周向不均匀,导致透平性能下降。因此对压缩空气储能系统耦合径向进气腔室的单级轴流透平进行数值模拟,探究了导叶周向非均匀分布对透平等熵效率及其内部流场的影响机理。以拉丁超立方采样方法获得大量样本方案,通过参数化处理及软件交互实现三维模型、网格的动态更新及模拟,实现采用正弦调制函数周向布置的非均匀导叶全过程自动化模拟。结果表明,导叶周向非均匀度小于10%时,透平等熵效率、膨胀比及质量流量等总体性能参数与初始均匀分布方案相比变化小于0.1%;导叶周向非均匀度超过15%时,会对透平内部流场产生明显的负面影响,造成导叶段压损增大,透平总体膨胀比下降,质量流量增大,等熵效率呈下降趋势,最高下降约1%。

关键词：压缩空气储能轴流透平径向进气腔室非均匀导叶自动化模拟

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Exploration and implementation of commonality valuation method in commercial aircraft family design

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Chinese Journal of Aeronautics 2019年第8期32卷 1828-1846页

作者： Yongjie ZHANG Zheng YANG xianchao MA Wenjun DONG Dayong DONG Zhaoguang TAN Shuai ZHANG School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Shanghai Aircraft Design and Research Institute Shanghai 200232China Beijing Aeronautical Science&Technology Research Institute Beijing 102211China

Commercial aircraft family design can reduce development costs, shorten development cycles, and expand the market coverage of aircraft. Commercial aircraft family development has become one of the most important features of modern aircraft design. This paper explores the effects of commonality on different aircraft models in a commercial aircraft family. The existing product commonality indexes are summarized and their limitations in the application to aircraft design are discussed. Then a new component commonality index is proposed based on the component decomposition structure. A model for calculating the aircraft program value is established,which considers development costs, manufacturing costs, sale price, operation costs and residual costs. The effects of aircraft commonality on time and economic costs of both development and manufacturing, and on sale price, are analyzed and quantified. The commonality evaluation strategy is obtained, which features comprehensive consideration of the aircraft program value and time costs. The break-even analysis of aircraft is proceeded on the basis of costs and price data. By using a real option method, the strategy considers the uncertainty of the aircraft program and the flexibility of the manufacturer. This strategy proves to be rational and applicable to aircraft design based on the calculation of three examples and the analysis of parameter sensitivity.

关键词： Aircraft cost Aircraft family Aircraft program value Commonality index Real option method

An improved spectral clustering algorithm based on random walk

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Frontiers of Materials Science 2011年第3期5卷 268-278页

作者： xianchao ZHANG Quanzeng YOU School of Software Dalian University of TechnologyDalian 116623China

The construction process for a similarity matrix has an important impact on the performance of spectral clustering algorithms. In this paper, we propose a random walk based approach to process the Gaussian kernel similarity matrix. In this method, the pair-wise similarity between two data points is not only related to the two points, but also related to their neighbors. As a result, the new similarity matrix is closer to the ideal matrix which can provide the best clustering result. We give a theoretical analysis of the similarity matrix and apply this similarity matrix to spectral clustering. We also propose a method to handle noisy items which may cause deterioration of clustering performance. Experimental results on real-world data sets show that the proposed spectral clustering algorithm significantly outperforms existing algorithms.

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