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and lose the safety and use function, and ultimately lose the possibility of artificial stability. Key words: model test; joint density and angle; broken rock zone; convergence percent; roadway... joint angles and joint densities were quantitatively studied in deep stress field. The results show that joint density affects largely the carrying capacity of the rock mass and has full control......
Relationship between fatigue life of asphalt concrete and polypropylene/polyester fibers using artificial neural network and genetic algorithmMorteza Vadood1, Majid Safar Johari1, Ali Reza Rahai2(1... using polypropylene and polyester fibers was evaluated and two models namely regression and artificial neural network (ANN) were used to predict the fatigue life based on the fibers parameters. As ANN......
Joint analysis of urban shopping destination and travel mode choice accounting for potential spatial correlation between alternativesLIN Yao-yu(林姚宇)1, DING Chuan(丁川)1, 2, WANG Yao-wu(王耀武)1, LIU Chao... States;4. Department of Civil Engineering, University of Memphis, Memphis 38152, United States)Abstract:In recent years, there have been important developments in the joint analysis of the travel behavior......
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in deciding the weld quality. Two methods, response surface methodology and artificial neural network were used to predict the tensile strength of friction stir welded AA7039 aluminium alloy. The experiments... out to identify critical parameters. The results obtained through response surface methodology were compared with those through artificial neural networks. Key words: friction stir welding; aluminium......
STUDY ON DYNAMIC J-INTEGRAL OF MECHANICAL HETEROGENEOUS WELDED JOINT D.Zhang1,X.Y.Li2,F.Q.Tian1,Y.W.Shi2,D.Y.He2 (1.Institute of Composite Materials, Shanghai Jiaotong University, Shanghai 200030, China;2.School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, China) Abstract:Welded joint is a mechanical heterogeneous body, and mechanical heterogeneity has......
of the IEEE International Joint Conference on Neural Networks, Anchorage: IEEE, 1998: 2396-2401. [16] Sadik K, Bekir H A, Halife K, et al. Medical application of information gain-based artificial immune...一种用于乳腺癌诊断的免疫分类算法 邓泽林1, 2,谭冠政1,叶吉祥1, 2,范必双1, 2 (1. 中南大学 信息科学与工程学院,湖南 长沙,410083； 2. 长沙理工大学 计算机与通信工程学院,湖南 长沙,410076) 摘 要:基于人工免疫识别系统AIRS(Artificial immune recognition system)和核函数提出免疫分类算法Kernel......
with non-persistent joints are governed by cracking process of the rock bridges. The dependence of cracking process of jointed rock masses on the two important geometrical parameters, joint orientation and joint persistence, was studied systematically by carrying out a series of uniaxial compression tests on gypsum specimens with regularly arranged multiple parallel pre-existing joints. According......
,与文献对比可知,这些析出相为相与相[14],析出相长度在90~120 nm之间,厚度为10~15 nm.与人工时效母材相比,析出相的整体密度增大,相占比明显增加；相比相更难以被剪切,可以为材料提供更为有效的强化,从而使蠕变时效后板材母材性能更高. 图5 人工时效和蠕变时效母材TEM微观组织照片 Fig. 5 TEM images of base metal after artificial...,从图6(d)可以看到,晶界附近有一定的位错结构.经对比分析可知,蠕变时效板材焊接后强度相对母材也出现明显下降,但由于基体内仍存在少量析出相和位错,强度比人工时效板材焊后的略高. 图6 人工时效和蠕变时效板材焊接接头TEM微观组织照片 Fig. 6 TEM images of welded joints after artificial aging and creep aging 综合上述分析可......
