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采用薄液膜装置研究了7A04铝合金在1mol·L-1硫酸钠溶液(pH=5)中的腐蚀行为,用扫描电镜(SEM)观察了腐蚀产物的微观形貌,用光电子能谱分析了腐蚀产物的组成,测试了试样在不同液膜厚度下腐蚀不同时间的交流阻抗曲线.结果表明:7A04铝合金在薄液膜下腐蚀不均匀,中心部位腐蚀轻微,而边沿腐蚀相对严重;腐蚀产物主要为Al(OH)3和硫酸铝;电化学阻抗谱显示在腐蚀前期(0~96h),110μm液膜下7A04铝合金的腐蚀速率最大,而在腐蚀后期(96~168h),材料在本体溶液中腐蚀速率最大
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Definition of a project and its attributes Key constraints within which a project must be managed How a project is “born” Life of a project Steps involved in the project management process Implications of global project management Benefits of project management
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一. 选择题: 1.(B) 2.(B ) 3.(A) 4 .(D) 5.(C) 6.(A) 7.(C) 8.(A) 9.(A) 10.(B) 11.(D) 二. 填空题: 1.自然光或(和)圆偏振光 、线偏振光(完全偏振光) 2.2 、1/4
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本文研究了Fe73.5Nb3Cu1Si13.5B9新型高性能铁基超微晶软磁合金的性能与结构特征。结果表明,该合金的最佳退火温度为535℃,其起始磁导率μ(0.08A/m)=14.8×104,矫顽力Hc=0.6A/m,饱和磁感B(800A/m)=1.22T。最佳铁损分另为P5·10k=5.6W/kg,P5·20k=17.4W/kg,P5·50k=80W/kg,P5·100k=270W/kg。且在相当宽的频率范围内具有高有效磁导率μ'1X射线衍射分析表明.合金中主相为xFe-Si固溶体,晶粒尺寸约为11nm,点阵参数a0为0.2837nm
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一、平面极坐标( Plane polar coordinate) 设一质点在Oxy平面内1y 运动,某时刻它位于点A. A(x,y) 矢径r与x轴之间的夹角为 0.于是质点在点A的位置 可由A(r,)来确定 以(r,)为坐标的参考系为 平面极坐标系. 它与直角坐标系之x=rcosθr=x 间的变换关系为:
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Legal History for a Dummy: A Comment on the Role of History in Judicial Interpretation of the Confrontation Clause by Peter Tillers* I struggled quite a bit over what I should talk about today. I know a little bit about exploratory fact investigation1 and about related matters such as induction and what philosophers of science call the logic of discovery.2 I thought about discussing the worrisome implications of Crawford v. Washington3
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一.测试线插孔 (1) 此万用表有四个测试线插孔,其中COM为黑表笔插孔。在左边有两个测试电流的红表笔插孔,“10A”和“mA–A”分别用来测量大电流(0~10A)和小电流(0~400mA)。最右边的红表笔插孔用来测量电流以外的其他量
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I At about this point, a feeling of loneliness may begin to overtake us__ an \epistemic loneliness.\ For the egocentric predicament is really an epistcmologica1 condition: isolation within a world of our own making. We live in a shell, so to speak, a private, personal shell inside which takes place an immense variety of experiences
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I At about this point, a feeling of loneliness may begin to overtake us__ an \epistemic loneliness.\ For the egocentric predicament is really an epistcmologica1 condition: isolation within a world of our own making. We live in a shell, so to speak, a private, personal shell inside which takes place an immense variety of experiences
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一、选择题 (1)B) (2)D) (3)A) (4)C) (5)D) (6)C) (7)A) (8)B) (9)C) (10)A) (11)D) (12)D) (13)B) (14)C) (15)B) (16)A)
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