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Learning Objectives Pre-Class Activities In-class Learning After-class Learning
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TEM in situ tensile tests of 310 stainless steel show that a dislocation free zone (DFZ) forms if the displacement keeps constant after dislocations are emitted from a crack tip. The elastic DFZ is gradually thinned and the stress in the DFZ will reach the cohesive strength, resulting in nucleation of nanocracks in it and their bluntness into voids. If continuously tensioning, the inhomogeneously thinning ahead of the crack tip, initiat-ing and connecting of microcracks or microvoids will be observed rather than a DFZ, nanocracks' initiation and bluntness into voids. The inverse pile-up ahead of a loaded crack tip can move back to the crack tip when unloading
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It is shown that the average [O] in the steel can be decreased to 12.86 ppm and there is an optimal [%Si] at the end of melting as 0.11%, at which [O] after vacuum carbon deoxidation (VCD) is minimum. A kinetical model has been deduced to simulate the VCD process. The results show that adding Si before Al is superior to the adding Al before Si with respect to the final [O] in the steel. It is suggested that the melting point of covering slag should be lower than 1550℃, and (FeO+MnO) should be less than 1%, so as to effectively refine GCr15 steel
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High temperature corrosion tests in 75%Na2SO4-25%. NaCl molten salt have been conducted on waspalloy specimens plasma sprayed with Co-Cr-B-Si, Ni-Cr-B-Si-hCr3C2, X-40, X-40 + TiC and Ni/Al + Al2O3 coatings, test coupons were exposed isothermally at 750℃up to 200 h. After the corrosion tests, each sample was examined by OM, SEM and EMPA. It was found that X-40, X-40 + TiC and Ni/Al + Al2O3 were violently corroded by the molten salt due to cracking and spalling of the coatings, whereas Co-Cr-B-Si and Ni-Cr-B-Si + Cr3C2 exhibited superior corrosion resistance, which were thought to be related to the formation of chromium and silicon oxide film. A possible corrosion mechanism had been proposed and it is suggested that the excellent corrosion resistance and high hot-hardness of the two B-Si containing coatings may be of significance for applications in petroleum refining industry as
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▪ 致盲眼病(首位、可逆性) ▪ 发病率 ▪ 现状 ▪ 任务 ▪ 大小及形状 ▪ 与周围的关系 ▪ 晶体纤维 ▪ 晶体囊膜(上皮细胞) ▪ 悬韧带 ▪ 生化组成 蛋白变性的因素 先天性白内障 (congenital cataract) 后发性白内障 (after cataract) 白内障手术后的视力矫正 白内障手术技术及并发症的处理 ◆视网膜脱离 ◆眼内炎 ◆上睑下垂
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I. General principles of drug absorption II. Dissolution and drug absorption III. Bioavailability and bioequivalence IV. Routes of drug administration V. Fate of drug after absorption VI. Pharmacokinetic principles
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《国外马克思主义 Western Marxism》阅读文献与材料:Marxism after Marx
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1. Compartmentalization in Eukaryotic Cells; 2. The structural and functional relationship between the ER, Golgi complexes, lysosomes and plasma membranes of eukaryotic cells; 3. The pathways of proteins targeting and sorting, and its mechanisms; 4. The ways of protein modifications and intracellular sites after they are synthesized; 5. Types of vesicle transport and their functions
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复旦大学:《材料失效分析 Materials Failure Analysis》课程教学资源(教学案例)52. Damage and residual life assessment of bends for X20CrMoV12.1 main steam pipe after long term service
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1. Genetic Counselors 2. Who Should See One 3. What to Expect During a Visit 4. After Counseling
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