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Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 772-777页

作者： Hao xiao Xianzhong duan Yi Zhang Department of Electrical and Computer Engineering University of ManitobaWinnipeg R3T 2N2ManitobaCanada State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key LaboratorySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina RTDS Technologies Inc. Winnipeg R3T 2E1ManitobaCanada

Distinction of weak and strong AC grids for emerging hierarchical-infeed LCC-UHVDC systems is important for planning and operation departments. However, accuracy of earlier distinction methods is limited as they were developed by empirical reasoning without rigorous theoretical analysis. Hence in this letter, hierarchical-infeed interactive effective short-circuit ratio (HIESCR) index is first used for strength evaluation of HIDC systems with complex inter-inverter interactions considered. Boundary HIESCR (BHIESCR) is also introduced in the proposed distinction method of weak and strong AC grids. That is, weak (or strong) AC grids are, respectively, identified when HIESCR is less (or greater) than BHIESCR. Second, it is shown BHIESCR remains almost unchanged as 3.0 versus various system parameters and rated operation variables based on rigorous theoretical analysis. This salient feature makes the proposed method more accurate than earlier methods. Finally, the proposed method is validated by simulations based on the PSCAD/EMTDC program.

关键词： Hierarchical-Infeedinteractive effective short-circuit ratio hierarchical-infeed LCC-UHVDC systems inter-inverter interactions strong AC grids weak AC grids

Green synthesis of functional metallic nanoparticles by dissimilatory metal-reducing bacteria“Shewanella”:A comprehensive review

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Journal of Materials Science & Technology 2023年第27期158卷 63-76页

作者： Jing Yang Peng Ju Xucheng dong Jizhou duan Hui xiao Xuexi Tang xiaofan Zhai Baorong Hou CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open studio for marine Corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Key Laboratory of Marine Eco-Environmental Science and Technology Marine Bioresource and Environment Research CenterFirst Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Sanya Institute of Ocean Eco-Environmental Engineering Sanya 572000China Institute of Marine Corrosion Protection Guangxi Key Laboratory of Marine Environmental ScienceGuangxi Academy of SciencesNanning 530007China

The biosynthesis strategy of nanoparticles has attracted much attention due to the mild synthesis condi-tions,environmental-friendly properties,and low *** nanoparticles(bio-NPs)not only show excellent physicochemical properties,but also exhibit high stability,enlarged specific surface area,and excellent biocompatibility,which are crucial for industrial,agricultural,and medical ***-wanella,a kind of dissimilatory metal-reducing bacteria,is regarded as a typical biosynthesis-functional bacteria class with wide distribution and strong ***,in this paper,functional bio-NPs by Shewanella were reviewed to provide a comprehensive view of current research *** biosynthetic mechanisms of Shewanella are summarized as the Mtr pathway(predominant),extracellular polymeric substance-induced pathway,and enzyme/protein-induced *** the biosynthesis process,bio-logical factors along with the physicochemical parameters highly influenced the properties of the resul-tant *** now,bio-NPs have been applied in various fields including environmental remediation,antibacterial applications,and microbial fuel ***,some challenging issues of bio-NPs by She-wanella remain unsolved,such as optimizing suitable bacterial strains,intelligently controlling bio-NPs,clarifying biosynthesis mechanisms,and expanding bio-NPs applications.

关键词： Shewanella strains Functional metallic nanoparticles Green biosynthesis Metal reduction

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食品4D打印技术在食品工业中的应用进展

食品工业科技 2025年第1期46卷 424-430页

作者：童强肖帅磊毕野吴豪董秀萍大连工业大学机械工程与自动化学院辽宁大连116034 海洋食品加工与安全控制全国重点实验室国家海洋食品工程技术研究中心辽宁省海产品精深加工产业共性技术创新平台大连市中式预制食品技术创新中心辽宁大连116034 大连工业大学食品交叉科学研究院辽宁大连116034

4D打印技术作为在3D打印的基础上增加了“时间”这个维度的新兴打印技术,不仅可以在三维空间内构建复杂结构,还能通过材料的预设形变来实现打印物体的自我组装和形态变化。4D打印技术作为新一代的增材制造技术,因演变过程完全可预测、... 详细信息

4D打印技术作为在3D打印的基础上增加了“时间”这个维度的新兴打印技术,不仅可以在三维空间内构建复杂结构,还能通过材料的预设形变来实现打印物体的自我组装和形态变化。4D打印技术作为新一代的增材制造技术,因演变过程完全可预测、可设计和可控制的特点,其潜力和影响力正在不断扩大。近年来,4D打印技术在现代食品加工领域也得到了广泛的研究和应用,通过4D打印实现食品结构、营养成分、口感等特性的精准控制。本文综述了食品4D打印技术原理、要素及优势,分析了食品4D打印在现代食品加工领域中的应用进展,包括4D打印材料特性、外界刺激等方面,并重点探讨了4D打印智能食品的微观结构控制与口感之间的关系,最后展望了食品4D打印技术发展趋势和挑战,旨在为现代食品加工领域提供参考借鉴。

关键词： 4D打印增材制造食品加工外界刺激微结构控制

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Testing of Seedborne Fungi in Wheat Germplasm Conserved in the National Crop Genebank of China

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Agricultural Sciences in China 2007年第6期6卷 682-687页

作者： duan Can-xing WANG xiao-ming ZHU Zhen-dong WU xiao-fei Institute of Crop Sciences Chinese Academy of Agricultural Sciences~The National Key Facilities for Crop Gene Resources and GeneticImprovement （NFCRI） Beijing 100081 P.R.China

There is a primary understanding of the dominant fungi in wheat seeds conserved in the National Crop Genebank of China （NCGB） and an evaluation of the healthy status of wheat germplasm propagated in different regions. A total of 1 465 wheat accessions were detected for seedbone fungi by blotter, agar plate, and wash tests. By blotter test, 17 genera of fungi, including more than 30 species, were detected in 712 wheat accessions from Shaanxi, Hebei, and Qinghai provinces, China. Alternaria was the most frequently detected in wheat seeds from Shaanxi Province, followed by Rhizopus, Penicillium, Aspergillus, Bipolaris, Cladosporium, Gonatobotrys, Chaetomium, and others. Seedborne fungi in wheat seeds from Hebei Province, with relatively high incidence were Alternaria, Rhizopus, Penicillium, Aspergillus, Bipolaris, Cladosporium, and Fusarium. In the seeds from Qinghai Province, Alternaria, Rhizopus, Bipolaris, Cladosporium, and Trichothecium are important seed-borne fungi. The seed germination was reduced substantially when seeds were infected by Fusarium verticillioides （syn. F. moniliforme）, Bipolaris nodulosa, and Cladosporium herbarum. Eighteen genera and 25 species of fungi were identified in 353 accessions from Shaanxi Province using the agar plate test. The dominant fungi were Alternaria, Aspergillus, Bipolaris, Gonatobotrys, Penicillium, and Fusarium. The smut fungi, Ustilago tritici, was detected by the wash test in 400 accessions, but it was low in incidence in 300 seed samples from Shaanxi Province （1.3%）, and in 100 samples from Hebei Province （2.0%）. Totally 19 genera of fungi were detected in wheat seed samples, and some seedborne fungi were saprophytic and others were biotrophic which could cause seedborne diseases in the field.

关键词： wheat gerrnplasm seedborne fungi seed health detection

Hybrid event-and time-triggered control for double-integrator heterogeneous networks

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Science China(Information Sciences) 2019年第2期62卷 73-84页

作者： Gaopeng duan Feng xiao Long WANG Center for Systems and Control College of Engineering Peking University Research Institute of Intelligent Control and Systems Harbin Institute of Technology

This paper investigates the state consensus for double-integrator networks under heterogeneous interaction topologies. For double-integrator networks, the setting of heterogeneous topologies means that position and velocity information flows are modeled by two different graphs. The corresponding protocol proposed in this paper is based on edge-event-triggered control. The events based on position information are irrelevant to velocity information and independent of the events based on velocity information. And for different edges, the corresponding events are activated independently of each other. Once an event occurs,the agents connected by the associated edge will sample their corresponding relative state information and update their corresponding controllers. Furthermore, under the presented event-triggering rules, the state consensus of double-integrator networks can be achieved by designing appropriate parameters. In addition,the proposed protocol with the event-triggering rules can effectively improve the system performance and avoid the occurrence of Zeno behaviors. Finally, a simulation example is worked out to verify the theoretical analysis.

关键词： consensus sampled-data control multi-agent systems edge-event-triggered control heterogeneous networks

SIMULATION OF THE ATOMIZED FLOW BY SLIT TYPE BUCKET ENERGY DISSIPATOR

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Journal of Hydrodynamics 2005年第6期17卷 758-763页

作者： LIU Shi-he duan Hong-dong School of Water Resource and Hydropower Wuhan University Wuhan 430072 China Water Resources and Hydropower Planning and Design general Institute MWR Beijing 100011 China

Slit type bucket is one kind of flip bucket for energy dissipation generally used in the hydraulic project. In this paper the atomized flow produced behind this energy dis sipator is analyzed, a numerical model for the aerated jet con sidering air entrainment and air resistance force is suggested, and simulation of the rain resulted by the atomized flow is also discussed. Furthermore, the prototype observation data for the atomized flow of dongjiang Hydropower Station is used to verify the model suggested.

关键词： two phase flow atomized flow slit type energy dissipator

A Gaussian copula regression model for movie box-office revenues prediction

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Science China(Information Sciences) 2017年第9期60卷 36-49页

作者： Junwen duan xiao DING Ting LIU Research Center for Social Computing and Information Retrieval Harbin Institute of Technology

In this article, we revisit the task of movie box-office revenues prediction using multi-type *** movie box-office revenues are affected by numerous factors. Previous work with discriminative models assumes these factors are identically and independently distributed. The correlations between these factors are rarely considered, which limited the performances of discriminative models in this task. To address these problems, we investigate a novel Gaussian copula regression model. Based on this model, we do not need to make any prior assumptions about the marginal distributions of the features. In particular, we perform a cumulative probability estimation on each of the smoothed features. The estimation learns the marginal distributions and maps all features into a uniform vector space. Sequentially, we bridge the marginal distributions with a copula function to create their joint distribution, and learn the dependency structure between them. Moreover, we propose a computational-efficient approximate algorithm for responsible variable inference. Experimental results on two movie datasets from Chinese and U.S. market show that our approach outperforms strong discriminative regression baselines.

关键词： Gaussian copula movie box-office revenue multi-variate regression text regression social media

Computing payment for ecosystem services in watersheds: An analysis of the Middle Route Project of South-to-North Water Diversion in China

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Journal of Environmental Sciences 2011年第12期23卷 2005-2012页

作者： Zhengju dong Yan Yan Jing duan xiao Fu Qingrong Zhou Xiang Huang Xiangen Zhu Jingzhu Zhao Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China North Research Center for Rural Wastewater Treatment Technology Ministry of Housing and Urban-Rural Development of China Beijing 100085 China Bureau of Water Conservancy and Hydroelectric Power of Shiyan City Hubei 442000 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Payment for ecosystem services （PES） has attracted considerable attention as an economic incentive for promoting natural resource management recently. As emphasis has been placed on using the incentive-based mechanism by the central government, rapid progress on PES research and practice has been achieved. However PES still faces many difficulties. A key issue is the lack of a fully-fledged theory and method to clearly define the design scope, accounting and feasibility of PES criteria. An improved watershed criteria model was developed in light of research on PES practices in China, investigations on the water source area for the Middle Route Project of South-to-North Water Diversion and ecosystem services outflows theory. The basic principle of assessment is the direct and opportunity cost for ecological conservation and environmental protection in the water source area deduct nationally-financed PES and internal effect. Then the scope and the criteria methods were determined, and internal effect was put forward to define benefits brought from water source area. Finally, Shiyan City, which is the main water source area for the Project of Water Diversion, was analyzed by this model and its payment was calculated. The results showed that：（1） during 2003–2050, the total direct cost and opportunity cost would reach up to 262.70 billion and 256.33 billion Chinese Yuan （CNY, 2000 constant prices）, i.e., 50.61% and 49.38% of total cost, respectively; （2） Shiyan City would gain 0.23, 0.06 and 0.03 CNY/m3 in 2014–2020, 2021–2030, and 2031–2050, respectively.

关键词： watershed payment for ecosystem services ecosystem services cost-benefit analysis Middle Route Project of South-to- North Water Diversion

ABO_3(A=R_(1-x)M_x;B=Mn)型锰氧化物材料中的磁卡效应

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内蒙古师范大学学报（自然科学汉文版） 2017年第3期46卷 341-345页

作者：孙晓东段玉梅云慧琴王婷曹凤泽田野吴鸿业赵建军鲁毅包头师范学院物理科学与技术学院内蒙古包头014030

一些锰氧化物具有独特的物理结构以及大的磁卡效应和较宽的磁制冷温区(80-375K),有望成为优秀的制冷工质.从理论和实验两个方面概述了ABO_3(A=R1-xMx;B=Mn)型锰氧化物材料中的磁卡效应,并介绍了典型的ABO_3型锰氧化物磁制冷材料的研究结果.

关键词：锰氧化物磁卡效应磁制冷材料