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Uncertainty Evaluation of Anticipated Transient without Scram plant Response in the Monju Reactor Considering Reactivity Coefficients within the Design Range

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Journal of Energy and power Engineering 2019年第11期13卷 393-403页

作者： Masutake Sotsu Taira Hazama Prototype Fast Reactor Knowledge Data group Fast Reactor Plant Technology Development DepartmentTsuruga Comprehensive Research and Development CenterJapan Atomic Energy AgencyShirakiTsurugaFukui 919-1279Japan

This paper describes the methods and results of an uncertainty evaluation of a significant plant response analysis of reactor trip failure events,specifically anticipated transients without scram in the Japanese prototype fast breeder reactor *** loss of heat sink(ULOHS)has a relatively large contribution to the core damage frequency due to reactor trip *** uncertainty in the allowable time to core damage in this event has so far been estimated by considering the range of reactivity *** are some cases where it is considered that core damage will be ***,if the primary heat transport system(PHTS)pump inlet sodium temperature stays below 650℃for 1 h,the avoidance of core damage due to a ULOHS event is *** is the temperature at which the probability of cavitation in the static pressure bearing begins to *** this study,a success scenario was investigated in two aspects:identification of influential input parameters and estimation of the probability of *** the parameter identification,input parameters that satisfy the pump inlet temperature being below 650°C are clarified by treating the reactivity coefficients and reactor kinetics parameters as variables that can be taken to be within the design *** the probability estimation,the results are fitted to a lognormal distribution function,from which the output variable was found to fall between 640 and 679℃with a probability of 90%,the probability of the temperature being 650℃or lower was 0.23,and the average and mode value was 659℃.

关键词： FBR Monju ATWS uncertainty

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Investigation of Thermal Expansion Model for Evaluation of Core Support Plate Reactivity in ATWS Event

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Journal of Energy and power Engineering 2020年第8期14卷 251-258页

作者： Masutake Sotsu Prototype Fast Reactor Knowledge Data group Fast Reactor Plant Technology Development DepartmentTsuruga Comprehensive Research and Development CenterJapan Atomic Energy AgencyShirakiTsurugaFukui 919-1279Japan

Thermal expansion behavior was investigated in detail for evaluation of the core support plate expansion reactivity in the ULOHS(Unprotected Loss of Heat Sink)reactor trip failure *** core support plate expansion reactivity plays an important role in the safety evaluation of the ULOHS *** this paper,a possibility of mechanical restraint was investigated in thermal expansion of the core structure for the prototype FBR(Fast Breeder Reactor)*** reactor core expansion was simulated in a three-dimensional FEA(Finite Element Analysis)model of the RV(Reactor Vessel)considering detailed temperature distribution of the sodium coolant based on the thermal-hydraulic analysis result of the whole core *** was found that the thermal expansion of the core was not restrained in the ULOHS event,although part of the core structure is mechanically restrained.

关键词： FBR Monju ATWS(Anticipated Transient without Scram) reactivity modeling

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Distribution Characteristics and Controlling Factors of Heavy Metals in Surface Sediments from the Bay-Island-Estuary System(BIES):A Case Study in Coastal Waters of Fujian Province,China

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中国海洋大学学报:英文版 2023年第5期22卷 1253-1268页

作者： LIU Bo HU Rijun WANG Yonghong LI Yi ZHU Longhai ZHANG Xiaodong YUAN Xiaodong College of Marine Geosciences Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 26610China Huaneng Xiapu Nuclear power Co.Ltd. Ningde 352000China

Based on the contents of six heavy metal elements in surface sediments from coastal areas of Fujian Province,the distribution characteristics and controlling factors of six heavy metals in a bay-island-estuary system(BIES)were *** paper focuses on the influence of the hydrodynamic environment,and systematically discusses how grain size compositions,chemical environment,tidal current,ocean circulation and human activities influence the distribution and transportation of the heavy *** results indicated that the distribution and migration of Cu,Pb,Zn and Cr elements were mainly controlled by natural factors such as regional geological background,grain size compositions,and tidal residual *** contrast,As and Hg was mainly affected by human factors such as agriculture and industrial *** the BIES,where the chemical environment exerted limited influence,the accumulation and migration of heavy metals are mainly influenced by human activities and enhanced by estuary processes as well as the complex sedimentary dynamic environment caused by many bays and islands.

关键词： heavy metals sediments source to sink controlling factors hydrodynamic environment

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Effect of Cold Plasma Treatment on Seed Germination and Growth of Wheat

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Plasma Science and Technology 2014年第1期16卷 54-58页

作者：蒋佳峰何昕李玲李建刚邵汉良徐启来叶仁宏董元华 Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of Sciences University of Chinese Academy of Sciences Changzhou Zhongke Changtai Plasma Technology Corporation Jiangsu Provincial Agricultural Reclamation and development Corporation Agricultural Center of Jiangsu Xinyang Farm

This study investigated the effect of cold helium plasma treatment on seed germina- tion, growth and yield of wheat. The effects of different power of cold plasma on the germination of treated wheat seeds were studied. We found that the treatment of 80 W could significantly improve seed germination potential （6.0%） and germination rate （6.7%） compared to the control group. Field experiments were carried out for wheat seeds treated with 80 W cold plasma. Com- pared with the control, plant height （20.3%）, root length （9.0%） and fresh weight （21.8%） were improved significantly at seedling stage. At booting stage, plant height, root length, fresh weight, stem diameter, leaf area and leaf thickness of the treated plant were respectively increased by 21.8%, 11.0%, 7.0%, 9.0%, 13.0% and 25.5%. At the same time, the chlorophyll content （9.8%）, nitrogen （10.0%） and moisture content （10.0%） were higher than those of the control, indicating that cold plasma treatment could promote the growth of wheat. The yield of treated wheat was 7.55 t-ha-1, 5.89% more than that of the control. Therefore, our results show that cold plasma has important application prospects for increasing wheat yield.

关键词： cold plasma seed treatment wheat seed germination plant growth increasedyield

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development of Carbon Dioxide Capture Technologies in Coal-Fired power plants

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Electricity 2010年第4期21卷 50-54页

作者： Gao Shiwang, Xu Shisen, Liu Lianbo, Niu Hongwei and Cai Ming Xi’an Thermal power Research Institute Co., Ltd. Liu Lianbo Xi'an Thermal power Research Institute Co. Ltd.

With a particular reference to China Huaneng group's practices in CO_2 capture, this article presents a brief ing on the current development of CO_2 capture technologies in coal-fired power plants both in China and abroad. Sooner or later, the integration of CO_2 capture and storage (CCS) facility with coal-fired power plant will be inevitably put on the agenda of developers.

关键词： coal-fired power plant emission control carbon dioxide capture

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Level of Detail Technique for plants

Level of Detail Technique for Plants

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第十一届中国体视学与图像分析学术会议

作者： Marc JAEGER Department of plant modelling AMAP CIRAD MontpellierFrance

Realistic modelling and interactive rendering of forestry and landscape is a challenge in computer graphics and virtual reality. A new development in plant growth modelling, simulation, visualization and application is plant models faithful to botanical knowledge, which represent the complex structures of a real plant and the function inside a real plant. Complex geometry and material of a large group of plants is a big burden to a high quality computer, and they often overwhelm the numerical calculation power and graphic rendering power. In order to accelerate the rendering speed of a group of plants, software techniques are often developed. For plant sparse organs, i. e. leaves, flowers or fruits, our approach is simplification of all sparse organs at the same time, i. e. , LOD and multi-resolution models for plants. In this paper, the principle and construction of plant simplification are explained, and they are used to construct LOD and multi-resolution models of sparse organs of big trees. This is the technique of plant LOD models, deduced from the basic knowledge of plant architecture. One example on a big poplar tree is shown of the effect of the LOD technique for a single big tree. Another example on a sweeping willow tree is used to show the application of LOD technique for view-dependent models. The last example is on virtual environment of 184 trees to prove the effect of LOD models with realistic rendering of virtual scenery. All these show that LOD can be an efficient technique to simplify the date complexity but to keep original visual complexity of plant community.

关键词： plant LOD multiresolution plant community

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Global leaf nitrogen and phosphorus stoichiometry and their scaling exponent

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National Science Review 2018年第5期5卷 728-739页

作者： Di Tian Zhengbing Yan Karl J.Niklas Wenxuan Han Jens Kattge Peter B.Reich Yongkai Luo Yahan Chen Zhiyao Tang Huifeng Hu Ian J.Wright Bernhard Schmid Jingyun Fang Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking University Max-Planck-Institute for Biogeochemistry State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences College of Life Sciences Capital Normal University Department of plant Biology Cornell University Department of Forest Resources University of Minnesota Department of Biological Sciences Macquarie UniversitySydneyNSW 2109Australia10 Department of Evolutionary Biology and Environmental StudiesUniversity of Zurich Hawkesbury Institute for the Environment Western Sydney University Key Laboratory of plant-Soil Interactions Ministry of EducationCollege of Resources and Environmental SciencesChina Agricultural University

Leaf nitrogen(N) and phosphorus(P) concentrations constrain photosynthetic and metabolic processes,growth and the productivity of plants. Their stoichiometry and scaling relationships regulate the allocation of N and P from subcellular to organism, and even ecosystem levels, and are crucial to the modelling of plant growth and nutrient cycles in terrestrial ecosystems. Prior work has revealed a general biogeographic pattern of leaf N and P stoichiometric relationships and shown that leaf N scales roughly as two-thirds the power of P. However, determining whether and how leaf N and P stoichiometries, especially their scaling exponents, change with functional groups and environmental conditions requires further verification. In this study, we compiled a global data set and documented the global leaf N and P concentrations and the N:P ratios by functional group, climate zone and continent. The global overall mean leaf N and P concentrations were 18.9 mg gand 1.2 mg g, respectively, with significantly higher concentrations in herbaceous than woody plants(21.72 mg gvs. 18.22 mg gfor N; and 1.64 mg gvs. 1.10 mg gfor P). Both leaf N and P showed higher concentrations at high latitudes than low latitudes. Among six continents, Europe had the highest N and P concentrations(20.79 and 1.54 mg g) and Oceania had the smallest values(10.01 and 0.46 mg g). These numerical values may be used as a basis for the comparison of other individual studies. Further, we found that the scaling exponent varied significantly across different functional groups,latitudinal zones, ecoregions and sites. The exponents of herbaceous and woody plants were 0.659 and0.705, respectively, with significant latitudinal patterns decreasing from tropical to temperate to boreal zones. At sites with a sample size ≥10, the values fluctuated from 0.366 to 1.928, with an average of *** factors including the intrinsic attributes of different life forms, P-related growth rates and relative nutrient availa

关键词： leaf nitrogen phosphorus stoichiometry scaling exponent functional group biogeography

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HeteroMeth： A Database of Cell-to-cell Heterogeneity in DNA Methylation

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Genomics, Proteomics & Bioinformatics 2018年第4期16卷 234-243页

作者： Qing Huan Yuliang Zhang Shaohuan Wu Wenfeng Qian State Key Laboratory of plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101China Key Laboratory of Genetic Network Biology Institute of Genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

DNA methylation is an important epigenetic mark that plays a vital role in gene expression and cell differentiation. The average DNA methylation level among a group of cells has been extensively documented. However, the cell-to-cell heterogeneity in DNA methylation, which reflects the differentiation of epigenetic status among cells, remains less investigated. Here we established a gold standard of the cell-to-cell heterogeneity in DNA methylation based on single-cell bisulfite sequencing （BS-seq） data. With that, we optimized a computational pipeline for estimating the heterogeneity in DNA methylation from bulk BS-seq data. We further built HeteroMeth, a database for searching, browsing, visualizing, and downloading the data for heterogeneity in DNA methylation for a total of 141 samples in humans, mice, Arabidopsis, and rice. Three genes are used as examples to illustrate the power of HeteroMeth in the identification of unique features in DNA methylation. The optimization of the computational strategy and the construction of the database in this study complement the recent experimental attempts on single-cell DNA methylomes and will facilitate the understanding of epigenetic mechanisms underlying cell differentiation and embryonic development. HeteroMeth is publicly available at http：//***/HeteroMeth.

关键词： Cell-to-cell heterogeneity DNA methylation Bisulfite sequencing Single cell Shannon entropy

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developments of power system protection and control

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Protection and Control of Modern power Systems 2016年第1期1卷 1-8页

作者： Z.Q.Bo X.N.Lin Q.P.Wang Y.H.Yi F.Q.Zhou XUJI group Corporation XuchangChina Huazhong University of Science and Technology WuhanChina.

Synchronized wide area communication has become a mature technology,which makes the real-time interaction between the substations and the wide area protection and control system ***,the present protection and control system to handle this real-time data has been recognized to be *** paper begins by reviewing the development history of power system protection,with special attention paid to the recent development in the field of wide-area and integrated protections,in order to look into the future development of protection and control *** the concept of integrated wide area protection and control is introduced,where it can be shown that a hierarchical protection and control system provides the protection and control for wide area or regional power substations/plants and their associated power *** system is mainly divided into three levels:the local,the substation/plant,and the wide area/*** integrated functions at each level are described in details with an aim to develop an optimal coordination mechanism between each *** key element in the proposed system is the wide area real-time protection and control information platform,which not only enables the merger of three lines of defence for power system protection and control,but also provides a perfect tool for the application of cloud computing in substations and power networks.

关键词： power system protection Wide area protection Integrated protection and control Information platform

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Investigation and Mitigation of Transformer Inrush Current during Black Start of an Independent power Producer plant

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Energy and power Engineering 2013年第1期5卷 1-7页

作者： Salman Kahrobaee Marcelo C. Algrain Sohrab Asgarpoor Department of Electrical Engineering University of Nebraska-Lincoln Lincoln USA Electric power Division Caterpillar Inc. Peoria USA

The energizing of large power transformers has long been considered a critical event in the operation of an electric power system. When a transformer is energized by the utility, a typical inrush current could be as high as ten times its rated current. This could cause many problems from mechanical stress on transformer windings to harmonics injection, and system protection malfunction. There have been numerous researches focusing on calculation and mitigation of the transformer inrush current. With the development of smart grid, distributed generation from independent power producers (IPPs) is growing rapidly. This paper investigates the inrush current due to black start of an IPP system with several parallel transformers, through a simulation model in DIgSILENT power Factory software. The study demonstrates that a single genset is capable of energizing a group of transformers since the overall inrush current is slightly above the inrush of the transformer directly connected to the generator. In addition, a simple method is proposed to mitigate the inrush current of the transformers using an auxiliary transformer.

关键词： Black Start Distributed Generation Inrush Current Mitigation Independent power Producer Transformer Energizing

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