检索结果-南通市图书馆

Performance of RegCM4 over Major River Basins in China

Advances in Atmospheric Sciences 2017年第4期34卷 441-455页

作者： Xuejie GAO Ying SHI zhenyu han Meili WANG Jia WU Dongfeng ZhanG Ying XU Filippo GIORGI Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China National Climate Center China Meteorological AdministrationBeijing 100081China China Meteorological News Press China Meteorological AdministrationBeijing 100081China Shanxi Climate Center Taiyuan 030006China The Abdus Salam International Centre for Theoretical Physics Trieste 34100Italy

A long-term simulation for the period 1990–2010 is conducted with the latest version of the International Centre for Theoretical Physics＇ Regional Climate Model（RegCM4）, driven by ERA-Interim boundary conditions at a grid spacing of 25 km. The Community Land Model（CLM） is used to describe land surface processes, with updates in the surface parameters,including the land cover and surface emissivity. The simulation is compared against observations to evaluate the model performance in reproducing the present day climatology and interannual variability over the 10 main river basins in China,with focus on surface air temperature and precipitation. Temperature and precipitation from the ERA-Interim reanalysis are also considered in the model assessment. Results show that the model reproduces the present day climatology over China and its main river basins, with better performances in June–July–August compared to December–January–February（DJF）.In DJF, we find a warm bias at high latitudes, underestimated precipitation in the south, and overestimated precipitation in the north. The model in general captures the observed interannual variability, with greater skill for temperature. We also find an underestimation of heavy precipitation events in eastern China, and an underestimation of consecutive dry days in northern China and the Tibetan Plateau. Similar biases for both mean climatology and extremes are found in the ERA-Interim reanalysis, indicating the difficulties for climate models in simulating extreme monsoon climate events over East Asia.

关键词： regional climate model RegCM4 China river basin CLM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

引用

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 833-841页

作者： Haibo Feng Shaohua Li Kexiao Wang Junheng Gao Shuize Wang Haitao Zhao zhenyu han Yong Deng Yuhe Huang Xinping Ma Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute for Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Pangang Group Panzhihua Iron and Steel Research Institute Co.Ltd. Panzhihua 617000China

Understandings of the effect of hot deformation parameters close to the practical production line on grain refinement are crucial for enhancing both the strength and toughness of future rail *** this work,the austenite dynamic recrystallization(DRX)behaviors of a eutectoid pearlite rail steel were studied using a thermo-mechanical simulator with hot deformation parameters frequently employed in rail production *** single-pass hot deformation results reveal that the prior austenite grain sizes(PAGSs)for samples with different deformation reductions decrease initially with an increase in deformation ***,once the deformation temperature is beyond a certain threshold,the PAGSs start to *** can be attributed to the rise in DRX volume fraction and the increase of DRX grain with deformation temperature,***-pass hot deformation results show that the accumulated strain generated in the first and second deformation passes can increase the extent of *** the case of complete DRX,PAGS is predominantly determined by the deformation temperature of the final *** suggests a strategic approach during industrial production where part of the deformation reduction in low temperature range can be shifted to the medium temperature range to release rolling mill loads.

关键词： eutectoid pearlite rail steel prior austenite grain size dynamic recrystallization single-pass hot deformation three-pass hot deformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Human Activities on Wintertime Haze-Related Meteorological Conditions over the Jing–Jin–Ji Region

引用

Engineering 2021年第8期7卷 1185-1192页

作者： Ying Xu Yanju Liu zhenyu han Botao Zhou Yihui Ding Jie Wuc Tongfei Tian Rouke Li Jing Wang National Climate Center China Meteorological AdministrationBeijing 100081China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Geography and Environmental Engineering Gannan Normal UniversityGanzhou 341000China Camford Royal School Beijing 100093China Climate and Environment Modeling Lab Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China

This work analyzes and discusses the influence of human activities on the meteorological conditions related to winter haze events in Beijing,Tianjin,and Hebei(i.e.,the Jing-Jin-Ji region)during 1961-2016,using the results of two numerical simulation experiments based on the Community Atmosphere Model version 5.1.1(http://***/models/cesm1.0/cam/docs/ug5_1_1/***)used in the international Climate Variability and Predictability Programme(CLIVAR)Climate of the 20th Century Detection and Attribution Project(C20C+D&A).The results show that,under the influence of human activities,the changes in dynamical and thermal meteorological conditions related to winter haze events in the Jing–Jin–Ji region are conducive to the formation and accumulation of haze,and prevent the diffusion of *** dynamical conditions mainly include the obvious weakening of the East Asian winter monsoon(EAWM)and the enhancement of the near-surface anomalous southerly *** thermal conditions include the obvious increase in surface temperature,and the enhancement of water vapor transport and near-surface *** relative contribution of dynamical and thermal conditions to the variation of haze days in the Jing-Jin-Ji region is analyzed using statistical *** results show that the contribution of human activities to the increase of haze days in the Jing-Jin-Ji region is greater than that of natural forcing for the study *** be specific,the dynamical meteorological factors contribute more to the haze days than the thermal meteorological *** contribution of thermal meteorological factors is basically the same in both scenarios.

关键词： Meteorological conditions Human activities Haze Jing-Jin-Ji region

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Abnormal Shape Mould Winding

引用

Chinese Journal of Aeronautics 2007年第6期20卷 552-558页

作者： Fu Hongya Wang Xianfeng han zhenyu Fu Yunzhong School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China

A theory of composite material patch winding is proposed to determine the winding trajectory with a meshed data model. Two different conditions are considered in this study. One is Bridge condition on the concave surface and the other is Slip line condition in the process of patch winding. This paper presents the judgment principles and corresponding solutions by applying differential geometry theory and space geometry theory. To verify the feasibility of the patch winding method, the winding control code is programmed. Furthermore, the winding experiments on an airplane inlet and a vane are performed. From the experiments, it shows that the patch winding theory has the advantages of flexibility, easy design and application.

关键词： filament winding fiber technology composite material airplane inlet vane

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation and Analysis on the Efficiency of Urbanization in China:From the Perspective of Environment and Resource Efficiency

引用

Chinese Journal of Urban and Environmental Studies 2018年第2期6卷 6-19页

作者： WEI Houkai SU Hongjian han zhenyu The Rural Development Institute Chinese Academy of Social Sciences Institute of Urban Economy Guizhou Academy of Social Sciences

The efficiency of urbanization is one of the important dimensions of urbanization quality. From the perspective of environment and resource efficiency, it mainly includes four aspects: land use efficiency, energy use efficiency, water use efficiency and environmental efficiency. This paper,through a review of previous studies and based on the connotations of the four aspects, builds an input–output indicator system with the 2013 data of Chinese cities at prefecture and above levels and evaluates the efficiency of urbanization comprehensively with a single-input and multi-output DEA-BCC model. According to the evaluation results, all indicators including the overall technical efficiency, pure technical efficiency, scale efficiency and the efficiencies of the four elements(land, energy, water and environment) present certain scale and regional characteristics; the indicators of technical efficiency and the urbanization rate show a significant U-shaped relationship; and other indicators also show a certain correlation with the urbanization rate.

关键词： Efficiency of urbanization environment and resource efficiency evaluation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Application of Union of Fuzzy Automata on Target Tracking

引用

Journal of Intelligent Learning Systems and Applications 2017年第4期9卷 47-54页

作者： Qinggang Wu zhenyu han Qinge Wu School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou China Engineering Training Center Zhengzhou University of Light Industry Zhengzhou China School of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou China

For better applications of fuzzy automata on target tracking, this paper presents an associated method of fuzzy automata by discussing the relation between fuzzy automata. The equivalence is mainly discussed regarding these fuzzy automata. The target tracking based on the associated method of fuzzy automata is given. Moreover, the simulation result shows that the associated method is better than single fuzzy automaton relatively. The development of these researches in this paper in turn can quicken the applications of the fuzzy automata in various fields.

关键词： Finite-State Deterministic Fuzzy Automaton Finite-State Non-Deterministic Fuzzy Automaton Fuzzy Finite-State Automaton Target Tracking

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Enlarged-end tool for friction stir lap welding towards hook defect controlling

引用

China Welding 2020年第1期29卷 1-7页

作者： LüZongliang han zhenyu Zhu Dong Huang Tifang Huang Yongxian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shanghai Lingyun Automobile R&D Branch Company Lingyun Industrial Corporation LimitedShanghai 201708China

Hook defect is one of the trickiest issues for friction stir lap welding,which remains to be *** this study,a designed pin with an enlarged-end was proposed to control the interfacial hook defect by optimizing its morphology *** insert aduncous structure at the advancing side is dissected by multilayer metallographic observation,which is the main character to terminate the inner-ward extension of the *** application of this tool was verified practical with a varied plunge depth of pin into the lower plate from 0.1 mm to 1.6 *** angle of the hook was small and terminated at the insert-structure or oriented toward the material convergence *** joint fractured along the hook line and the highest joint efficiency reached 86%of the parent 6082-T4 aluminum alloy.

关键词： friction stir welding welding tool hook defect microstructures mechanical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Feature Extraction to Polar Image

引用

Journal of Computer and Communications 2017年第11期5卷 16-26页

作者： Donghua Gu zhenyu han Qinge Wu Engineering Training Center Zhengzhou University of Light Industry Zhengzhou China College of Electric and Information Engineering Zhengzhou University of Light Industry Zhengzhou China

Some algorithms of feature extraction in existing literature studied for image processing was the gray image with one-dimensional parameter. However, some feature points’ extraction for three-dimensional color of polar image, such as the color edge extraction, inflection points, and so on, was urgently to be solved a polar color problem. For achieving quickly and accurately the color feature extraction to polar image, this paper proposed a similar region of color algorithm. The algorithm was compared to polar image, and the effect to color extraction was also described by the combination of the proposed and existing algorithms. Moreover, this paper gave the comparison of the proposed algorithm and an existing classical algorithm to extraction of color feature. These researches in this paper provided a powerful tool for polar image classification, color feature segmentation, precise recognition, and so on.

关键词： Similar Region of Color Algorithm Polar Image Edge Detection Corner Point Extraction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of FRS on Target Recognition

引用

Open Journal of Applied Sciences 2017年第10期7卷 503-510页

作者： Donghua Gu zhenyu han Qing’e Wu Engineering Training Center Zhengzhou University of Light Industry Zhengzhou China School of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou China

In order to let machine better imitate thinking method of people to perform recognition and classification for fuzzy and uncertain thing, this paper puts forward a fuzzy and rough association method to deal with the problem. However, the application of fuzzy rough sets (FRS) will be introduced mainly on pattern recognition. Some related theories on FRS would be discussed, and some fuzzy rough mathematical methods on pattern-recognition will be given. Then, concrete applications of FRS on image processing and recognition will be introduced. Simulation result signifies that this fuzzy and rough association method is not only fast but also closer to nature attribute of thing for processing and recognizing image by comparing with the single neural network and other recognition device. The recognition rate is about 95.78%.

关键词： FR Proximity Maximum Principle of Membership Principle of Proximity Target Recognition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of Fuzzy Automata Decision-Making System in Target Control

引用

Journal of Computer and Communications 2017年第10期5卷 16-25页

作者： Qinggang Wu zhenyu han Qing E. Wu School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou China Engineering Training Center Zhengzhou University of Light Industry Zhengzhou China College of Electric and Information Engineering Zhengzhou University of Light Industry Zhengzhou China

In order to perform better in target control, this paper proposed a decision-making system method based on fuzzy automata. The decision-making system first preprocessed the signal and then performed a two-level decision on the target to achieve optimal control. The system consisted of four parts: signal preprocessing, contrast decision-making, comprehensive judgment of decision-making and decision-making result. These decision algorithms in target control were given. A concrete application of this decision-making system in target control was described. Being compared with other existing methods, this paper used both global features and local features of target, and used the decision-making system of fuzzy automata for the target control. Simulation results showed that the control effect based on the decision-making system was better than that of the other existing methods. Not only it was faster, but also its correct control rate was higher to be 95.18% for the target control. This research on the control system not only developed the FA theory, but also strengthened its application scope in the field of control engineering.

关键词： Decision-Making System Comprehensive Judgment Fuzzy Automata Target Control

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：