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Mill scale structure and damp heat corrosion performance of four 510L hot-rolled strips

Baosteel Technical Research 2011年第2期5卷 46-52页

作者： QI Huibin WANG Wei QIAN Yuhai DONG Chaofang LI Xiaogang Welding ＆ Surface Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China

In this study, the matrix structure, state and composition of the mill scales of four typical domestically made 510L hot-rolled strips were observed and analyzed by means of optical microscopy （OM） ,scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The corrosion behavior of the steels with and without mill scales were investigated by means of hot-humid corrosion tests under the condition of relative humidity （ RH ） of 95% at 50℃ and 70℃, respectively. The results show that the matrix structures, state, composition and thickness of mill scales vary in the strips. The rusting starting time of the specimens with scales is generally a bit longer than that of the specimens without scales, but their corrosion mass-gain is higher. For these two kinds of specimens ,their corrosion rate increases significantly with the increase of temperature. The rusting behavior of the 510L strips produced by various plants is different due to the variations of hot-rolling processes and designed chemical compositions. Various relevant aspects should be taken into account in the evaluation of the corrosion behavior of hot-rolled strips.

关键词： 510L hot-rolled strip steel matrix structure scale structure corrosion behavior

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Physical Mechanism of Formation of the Bimodal structure in the Meiyu Front System

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Chinese Physics Letters 2005年第12期22卷 3218-3220页

作者：崔晓鹏高守亭宗志平刘文明李小凡 Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 National Meteorological Centre China Meteorological Administration Beijing 100081 Liaoning Meteorological Observatory Liaoning Meteorological Bureau Shenyang 110016 joint Center for Satellite Data Assimilation and NOAA/NESDIS/Office of Research and Applications Camp Springs Maryland 21029 USA

The bimodal structure of the Meiyu front system is readdressed after Zhou et al.（2005）. The physical mechanism of the formation of the bimodal distribution is discussed. The bimodal structure of the Melyu front system considerably results from atmospheric moisture gradients, though atmospheric temperature gradients are also not negligible. According to the definition of equivalent potential temperature, and by scale analysis, we find that atmospheric equivalent potential temperature gradients, which could be regarded as an indicator of the Meiyu front system, could be mainly attributed to the variations of atmospheric potential temperature gradients with a scaling factor of 1 and moisture gradients multiplied by a scaling factor of an order of about 2.5 × 10^3, which means that small variations of atmospheric moisture gradients could lead to large variations of equivalent potential temperature gradients, and thus large variations of the Meiyu front system. Quantitative diagnostics with a mesoscale simulation data in the vicinity of the Meiyu front system show that moisture gradients contribute to equivalent potential temperature gradients more than potential temperature gradients.

关键词： SLANTWISE VORTICITY DEVELOPMENT MOIST POTENTIAL VORTICITY ASIANSUMMER MONSOON EAST CHINA SEA scale structure PART II REGION CONVERGENCE TRANSPORT FEATURES

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Evolutionary model of the central place hierarchical system

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Science China Earth Sciences 2011年第10期54卷 1614-1626页

作者： LU YuQi YUAN LinWang ZHONG YeXi Key Laboratory of VGE Ministry of Education Nanjing Normal University Nanjing 210046 China

Central place theory is one of the two theoretical cornerstones of geography, yet it cannot be connected with other spatial structure models, fails to provide definite time-space parameter conditions, lacks an evolutionary process model, and does not easily enable construction of a complete theoretical system of regional spatial structure. This paper gives an in-depth analysis of the process and mechanism for production and evolution of central places of different grades, and constructs an evolutionary model of the central place hierarchical system. The results of deduction, analysis and simulation show that production and evolution of the central place hierarchical system may be divided into five stages. These stages are the embryonic, formative, improvement, maturation, and advancement stages. Affected by spatial location and centricity, central places have obvious differences in scale and functional structures. There are great differences in the scale of same-grade central places. However, low-grade central places could have larger scales than high-grade central places, and the central places of a central location may form the agglomeration area of central places. Based on the hypothesis condition of an isotropic plain, the research shows that it is possible not only to form proportional functional structures of central places, but also to produce non-proportional scale structures of central places, and thus to complete the transformation from rationalistic deduction of spatial equilibrium mode to an explanation and demonstration of an unbalanced practical model.

关键词： central place theory hierarchical system evolutionary model functional structure scale structure

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Regional structure and Spatial Morphology Characteristics of Oasis Urban Agglomeration in Arid Area——A Case of Urban Agglomeration in Northern Slope of Tianshan Mountains,Northwest China

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Chinese Geographical Science 2009年第4期19卷 341-348页

作者： ZHANG Yufang YANG Degang ZHANG Xinhuan DONG Wen ZHANG Xiaolei Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

It is great important to the health development of urban agglomeration to correctly understand the formation and development law of regional structure of urban *** the analysis methods like fractal theory and quantitative statistics,coupling with the use of remote sensing images and other spatial data,this article discusses the urban agglomeration of oasis on the northern slope of the Tianshan Mountains in an arid area,and conducts the researches on its city scale,spatial distribution and individual form from 1990 to *** result shows that it has loose hierarchical scale structure and polarization trend of population distribution while its hierarchical scale structure tends to *** the influence of natural conditions,the spatial layout of urban agglomeration of oasis has macro characteristics that suggest cities distributed along oasis edges(dense or sparse),spatially expand along rivers,and cluster around traffic *** connectivity among the cities is high and shows an internal organization form of a banding *** whole spatial shape of the internal structure of cities presents a "dumbbell" form,with mononuclear phenomenon receding and multi-nuclear appearing *** cities spatially expand along rivers,portraying a long strip *** indicates that the urban agglomeration of oasis shows regular and close structure but with a tendency to be complicated form and the loose *** the development of urban agglomeration,the authors recommend that the development of the city with good economic development conditions should be strengthened,and more attention be put into regional planning.

关键词： fractal theory scale structure urban agglomeration of oasis Tianshan Mountains

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什么是研究型大学合理的学生规模结构：基于跨国的院校比较

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高等教育 2016年第9期 8-15页

作者：王传毅吕晓泓严会芬

学生规模和结构是影响院校培养质量、办学效益的重要因素。世界一流大学和一流大学中美国公立大学相关指标数值的分布特征显示：合理的规模结构为在校本科生介于18583人至26928人，在校研究生介于6994人至11513人，生师比介于16至18，... 详细信息

学生规模和结构是影响院校培养质量、办学效益的重要因素。世界一流大学和一流大学中美国公立大学相关指标数值的分布特征显示：合理的规模结构为在校本科生介于18583人至26928人，在校研究生介于6994人至11513人，生师比介于16至18，博士学位授予数占研究生层次学位授予数的比例介于0.24至0.33。

关键词：世界一流大学学生规模结构 world-class universities students scale structure

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生产社会化理论的本源与分析框架

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政治经济学评论 2017年第6期

作者：高泽华

本文对马克思主义经典作家关于生产社会化的相关论述较之前研究进行了更加全面系统的梳理。对生产社会化的主要内容、特征、作用、发展趋势、与经典社会主义经济模式形成的关系，及其特征和趋势的形成原因和判断依据等方面进行总结和阐... 详细信息

本文对马克思主义经典作家关于生产社会化的相关论述较之前研究进行了更加全面系统的梳理。对生产社会化的主要内容、特征、作用、发展趋势、与经典社会主义经济模式形成的关系，及其特征和趋势的形成原因和判断依据等方面进行总结和阐释。初步提出了生产社会化理论的研究思路和分析框架，重点阐述了生产社会化趋势形成的影响因素和作用机制，生产社会化如何通过企业分工协作和社会分工协作两种形式、社会化的劳动过程与社会化生产组织的规模结构两个方面及其相互作用推动资本主义生产关系和资源配置方式的形成与演变。最后结合时代发展，认为经典作家们对于生产社会化内涵、特征的认识及其分析方法在当下仍然具有重要的理论和现实意义。

关键词：生产社会化分工协作劳动过程规模结构基本经济模式 socialization of production labor division and cooperation labor process scale structure basic economic model

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