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, an automatic recognition technique was discussed. Spectrum images of defects can be got by fast Fourier transform (FFT) and sum of valid pixels (SVP), and its optimized center region, which concentrates nearly......
高碳钢中珠光体片层与先共析铁素体对断裂韧性的影响魏泽民1,2,梁宇1,2,梁益龙1,2,熊虎1,2,韦贤毅1,21. 贵州大学材料与冶金学院2. 贵州省材料结构与强度重点实验室摘 要:以珠光体钢为研究对象,在不同盐浴温度下等温获得不同特征的珠光体组织.进行了力学性能测试与准静态断裂韧性(J0.2BL)测试,在扫描电子显微镜(SEM)下观察了微观组织与裂纹扩展路径.研究结果表明,珠光体片层间距与铁素体量对断裂韧性具有显著影响,裂纹扩展阻力由珠光体片层间距以及先共析铁素体含量共同决定,根据不同组织对裂纹扩展阻力的贡献值珠光体钢裂纹扩展总阻力可用表达式δ(SUM)=k’δ(P)+kδ(F)来进行描述,随着等温温度的增加,珠光体片层间距与先共析铁素体量增加,珠光体钢裂纹扩展总阻力呈先上升后下降的趋势,与......
of model sorbents derived from temperature programmed desorption (TPD) approach reaches 1.72 mmol·g-1 that is much higher than the sum of adsorption capacity of bare mesoporous silica and free polymers......
矿物学文献中未定名矿物的编码系统:国际矿物学协会新矿物与命名和分类委员会"未定名矿物"小组报告杨主明33. 中国科学院地质与地球物理研究所摘 要:国际矿物学协会新矿物与命名和分类委员会(IMA-CNMMN)的未定名矿物小组(SUM),开发了一个编码系统,对已经发表但尚未定名的矿物进行编码.在文献中存在两类未定名矿物.一是"有效"未定名矿物,是指未定名矿物没有对应的已知矿物种,但如果它们有其他产地或能够在其他样品中被发现,那么已发表的相关矿物描述允许得到认可.二是"无效"未定名矿物,是指未定名矿物已经有对应的已知矿物种;或者相关矿物描述不足以获得认可.未定名矿物的名单是由IMA保管.该编码系统提供了一个永久的UM号码.中国的矿物学文献的数量和重要性有必要用中文阐述未定名矿物的编码系统.关键......
strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness......
of polymor-phous silicon (pm-Si:H) films were investigated. The decays can be fit fairly well bya sum of two exponential decay functions, which indicates that there arc two kindsof traps contributing......
agent concentration, leaching temperature, leaching cumulative time and solid-to-liquid ratio. The thermodynamics and kinetics of the zinc leaching process were also analyzed. The results show.... With the increase of concentration of NaOH and the cumulative time, zinc leaching will be significantly increased. The kinetics study demonstrates that the leaching reaction is chemically controlled......
; Abstract: AZ61Mg alloy was multi directionally forged (MDFed) during decreasing temperature condition from 643 K to 483 K at a true strain rate of 3×10-3 s-1 up to cumulative strain of ∑?ε=4.0 at maximum. A pass strain of ?ε=0.8 was employed. While average grain size decreased gradually with increasing cumulative strain, the evolution of fine-grained structure strongly depended on the MDF......
formed during laser cladding.Volume faction of multiple ceramic particles increases with the increasing of Y2 O3.The cumulative oxidation mass of the coating with 2 wt% Y2 O3 is decreased by one......
and grows into metallic iron grains. Most of the metallic iron grains exist in the quasi-spherical shape and inlaid in the slag matrix. The cumulative frequency of metallic iron grain size is markedly......
