共搜索到7044条信息,每页显示10条信息,共705页。用时:0小时0分0秒355毫秒
DOI: 10.11817/j.issn.1672-7207.2020.08.006 (1) 式中:Z为粗糙表面的垂直坐标;x为粗糙表面的水平坐标;D为粗糙表面的分形维数,对于二维W-M函数,1 三维W-M函数是在二维W-M函数的基础上发展得来 (2) 式中:为随机部数;An与Bn为独立同分布的随机变量,共同服从[0,2π]的均匀分布;y为垂直于x的水平坐标,2 以W-M分形函数为理论基础,通过Python编程模拟出基于W-M分形函数的粗糙表面.在本文中,模拟一块轨道板(长为4.8 m,宽为2.4 m)的粗糙表面,参考文献[17]关于采样频率的取值,在轨道板长度和宽度方向采样间隔均为0.0......
焦化工序水流图构建及其应用分析董辉1,喻志强1,肖圣雁1,杜涛1,蔡九菊1(1.辽宁省沈阳市东北大学国家环境保护生态工业重点实验室)摘 要:运用物质流分析理论中的跟踪观察法(即拉格朗日法),借鉴系统节能分析方法中的中小循环理论,根据焦化工序的工艺流程特点构建了钢铁企业焦化工序水流图及其用水评价指标,在此基础上对钢铁企业焦化工序的用水情况进行了分析.并通过对某钢铁企业焦化厂2008年数据的调研与分析,构建了该厂焦化工序的水流图和用水评价指标,借助水流图和评价指标对其用水情况进行分析评价,指出其用水现状和存在的不足......
......
Article ID: 1003-6326(2005)02-0243-04 Machinability evaluation of machinable ceramics with fuzzy theory YU Ai-bing(于爱兵)1, ZHONG Li-jun(钟利军)1, TAN Ye-fa(谭业发)2 (1. Key Laboratory of Advanced...) Abstract: The property parameters and machining output parameters were selected for machinability evaluation of machinable ceramics. Based on fuzzy evaluation theory, two-stage fuzzy evaluation approach......
J. Cent. South Univ. (2012) 19: 1364-1369 DOI: 10.1007/s11771-012-1151-x Ecological suitability evaluation for urban growth boundary in red soil hilly areas based on fuzzy theory JIAO Sheng(焦胜... exists in spatial distribution of geographic data of land suitability evaluation processes, which makes it difficult to quantify land boundaries by using traditional binary logic-based overlay model......
J. Cent. South Univ. Technol. (2011) 18: 1248-1255 DOI: 10.1007/s11771-011-0829-9 Performance index limits of high reinforced concrete shear wall components LAO Xiao-chun(劳晓春)1, 2, HAN Xiao-lei(韩... University of Technology, Guangzhou 510640, China ? Central South University Press and Springer-Verlag Berlin Heidelberg 2011 Abstract: The deformation performance index limits of high reinforced......
the index system of synthetical evaluation. Based on the effect degree of each selected index on soil fertility, a judgment matrix was built, and the weight coefficient was determined by the method... have done some studies related with quantitative mathematics method of soil fertility evaluation, and put forward many valuable evaluation methods, including AHP method [12], integrated fertility index......
Evaluation of reclamation land productivity in mining districtsWU Xue-qun, ZUO Xiao-qing, FANG Yuan-min(Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming... and Delphi method. According to membership grades and combined weights of all factors, integrated fertility index (IFI) of every land was calculated to reflect levels of the productivity of reclamation lands......
J. Cent. South Univ. (2016) 23: 2321-2328 DOI: 10.1007/s11771-016-3290-y Experiment study of optimization on prediction index gases of coal spontaneous combustion NIU Hui-yong(牛会永)1, 2, DENG Xiang... tested in laboratory. The data obtained from laboratory determination were initialized for the value which was defined as "K". The ratio of each index gas and value of "K", and the ratio of combination......
:In order to find a parameter as the evaluation index that can capture the effect of the interaction between asphalt and aggregate, the rheological properties... physical meaning is finally selected as the evaluation index for interaction ability of asphalt and aggregate.关键词:......