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to pit formation and pit growth was studied by applying potentiodynamic polarisation tests. The results of scanning electron microscopy (SEM/EDS) showed that the size of pits formed in naturally aged..., and in later phases of testing of artificially aged alloy. The synergistic effect of the inhibitor mixture was not noticed on pit formation and pit growth. Key words: aluminium alloy; pitting corrosion......
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was effectively used to study the defects of SiC. Etch pit shapes of defects and their origins were discussed. Most of the defects originate in the initial growth stage. Thus to optimize the early......
-pit 图3 典型剖面图及监测点布置 Fig. 3 Typical profile and monitoring points arrangement 图4 各工况下边坡监测点水平位移历程曲线 Fig. 4 Curves of horizontal displacement of monitoring points under different...[J]. Mining Technology, 2008, 8(5): 13-16. [5] 薛 涛. 基于突变理论的露天矿复杂采空区稳定性研究[D]. 长沙: 中南大学, 2012. XUE Tao. Research on goaf stability of open pit mines based on catastrophe theory[D]. Changsha: Central......
TiC掺杂12芯MgB2线材微观结构以及超导电性刘国庆1,孙昱艳2,王庆阳1,冯建清1,贾佳林1,闫果3,李成山11. 西北有色金属研究院2. 东北大学3. 西部超导材料科技有限公司摘 要:采用PIT工艺,以分步法粉末为装管前驱粉,选用中心铜铌复合棒增强的导体结构制备了TiC掺杂MgB2多芯线材,研究了不同热处理温度对于粉末相组成,线材的微观结构以及超导电性的影响,结果表明分步法粉末能够有效提高C原子的取代水平,同时芯丝中MgB2晶粒尺寸达到亚微米级,MgB2晶粒连结性较好,制备多芯线材在4.2K,5T时,其Jc仍高达3×104A/cm2.关键词:微观结构;超导电性;TiC掺杂;MgB2多芯线材;......
corrosion.Based on the evolution of electrical parameters of the equivalent electrical circuit,it is suggested that the most probable mechanism of pit creation is the film breaking model.The result demonstrates......
with tunable micro-architecture of Pb I2crystals are prepared via solution processable crystal engineering.The perovskite film,prepared by optimized pit spacing in gas pumped Pb I2film at 1000 Pa,shows the highest film quality,including no residual Pb I2phase,compact morphology,and improved photoluminescence intensity.A transformation kinetics shows that the pit spacing strongly influences both the mass......
, and the sand gravel soil with strong permeability is at the bottom, the mechanism of the dewatering-induced land subsidence around the pit in binary-structure soil was analyzed, the determination... subsidence around the pit was obtained by the delamination summation-method. The results show that the calculated land subsidences agree well with those monitored, which shows that the proposed settlement......
: length of diaphragm wall, thickness of jet-grouting reinforcement layer, ways of subsoil reinforcement, sequence of pit excavation, connection between slabs and diaphragm wall or column and width of pit... -16.6 to -43 m in pit is reinforced through jet-grouting. But, as excavation proceeds to a lower level, benefit from soil reinforcement diminishes. During the process applying vertical load, the larger......
