共搜索到4155条信息,每页显示10条信息,共416页。用时:0小时0分0秒421毫秒
......
optimization problems, an infeasible solutions driven differential volution algorithm was proposed. A self-adaptive combination mutation operator, which can balance the exploration capability... optimization problem; self-adaptive combination mutation operator; probability selection rule; selection operator 约束优化问题是一类广泛存在于科学研究和工程实际中的难解数学规划问题,其一般形式如式(1)所示,对其研究具有十分重要的理论和实际意义. minimize f(x......
......
capacity of thick-walled cylinder.Key words:thick-walled cylinder; stress analytical solution; complex variable function; non-uniform distributed pressure; stress concentration; combination of different......
surface was deduced. Orthogonal rotation combination design with contrasting predictive value was used to select sampling points to obtain the optimal experimental area. Based on the principle of NSGA... optimization algorithm; orthogonal rotation combination design; optimization system 在结构优化设计领域中,采取样本点,建立代理模型(响应面),组建分析方法(优化算法)是三大关键环节.在对复杂的实际工程问题进行优化设计时常遇到以下阻碍:1) 试验设计样本点发生改变,常引起预测值方差发生改变,导致不同点间的预测值无法对比,难以得到最优试......
......
APPLICABILITY OF THE MASS ACTION LAW IN COMBINATION WITH THE COEXISTENCE THEORY OF METALLIC MELTS INVOLVING COMPOUND TO BINARY METALLIC MELTS J.Zhang1 (1.Metallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Abstract:Based on the atomicity and molecularity as well as the consistency of thermodynamicproperties and activities of metallic melts......
Fabrication and Characterization of Nanopillar-Like HA Coating on Porous Ti6Al4V Scaffold by a Combination of Alkali–Acid-Heat and Hydrothermal TreatmentsJun-Lei Li1,Shuai Wang1,Fang Cao1,Xiao Lin2,Xiao-Wei Wei1,Zhen-Hua Zhao1,Xiao-Jie Dou1,Wei-Ting Yu1,Ke Yang3,De-Wei Zhao11. Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University2. Orthopaedic Institute, Medical College......
dissolution pores), pores between organic and mineral. There are nine kinds of main existing crack combinations of configuration on Cross-section and section, and these configurations of crack combination... well; pores; crock; bedrock pores; combination of configuration; geological factors......
evaluation of fractured rate of shale was achieved by combining SEM technique and ImageJ. A mathematical model based on the combination weight method was established to quantitatively evaluate... to be fractured. It is better to choose shale with fracability index above 0.436 3. Key words: northwestern Hunan; shale gas reservoir; Lower Cambrian Niutitang; combination weight method; fracability......