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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Studies on exposure status of inhabitants to water-arsenic valence states in areas with endemic arsenism in the Datong basin in
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This study aimed to describe the distribution of water-arsenic (As) valence states and its relationship to areas with endemic arsenism in the Datong basin.
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The most common type of drinking water arsenic valence state was As(III) in the endemic disease-areas.
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This led us to conclude that the fraction of each water-arsenic valence state should be studied when determining the arsenic content of drinking water.
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The valence of atoms was determined by X-ray photoelectron spectroscopy.
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| | The eguilibrium constant K11 in WSM's ( Whitewey, Smith and Masson) model is a characteristic number of polymerization degree of binary silicate melts. In this paper, the relationship between some parameters and K11 are discussed. Also, the corresponding relations between K11 and following values such as the ratio of Z/γk which means the ratio of effective nucleus charges to radius of metallic ions,the second ionization energy I2,the Slater's potential energy function of second valence electron C(Z"-σ... | | WSM(whitewey,Smith和Masson)模型的平衡常数K_(11)是二元硅酸盐熔体聚合度的表征。本文讨论了某些键参数Z/r_k(金属离子的有效核电荷与离子半径比)、I_2(第二电离能)、[(Z″-σ)/n]~2(形成二价离子的Slater电子位能函数)、x_A(Allred-Rochow电负性)与K_(11)的对应关系。其中用lgK_(11)对X~3A作图得到直线关系,其经验方程可整理为:lgK_(11)=-3.75+0.845X~3A-(Z/r_k)△X~(1/3)×lg(1600/T℃)。根据该方程可以计算二元硅酸盐熔体聚合的K_(11)值。计算结果与实验结果基本相符。 | | 文摘来源 | | The titanium loss during electroslag remelting superalloys A286 and V57 has been studied. It was shown that TiO_2 becomes the predominant oxidant causing the titanium loss of the superalloys when the concentration of TiO_2 in slag used is higher enough, and that the oxide of lower valence titanium which may be kept in eqilibrium with titanium in molten superalloy seems mainly to be Ti_3O_5. The controlling factor for the rate of titanium loss may be the speed of mass transfer of Ti~(4+) across metal/s... | | 研究A286和V57合金电渣重熔过程中钛烧损时,发现渣中TiO_2浓度较高时,TiO_2是钛烧损的主要氧化剂。与合金中的钛相平衡的渣中低价钛氧化物主要是Ti_3O_5.决定钛烧损速率的主要因素是Ti~(4+)在钢/渣界面层的传质速度。传质速度随渣中TiO_2浓度的增加而增大。降低Ti~(3+)向渣/气界面的扩散速度是减少合金中钛烧损的关键。研究了CaF_2-Al_2O_3-TiO_2渣系中Ti~(4+)在电极/熔渣和金属熔池/熔渣界面在1700±10℃的传质系数与渣中TiO_2含量的关系,测定了Ti~(3+)向渣/气界面的传质系数为2.2×10~(-1)cm/s(1500℃)。 | | 文摘来源 | | The XPS has been used to study the composition and structure of the oxide film on stainless steel. The film was formed in the transpassive region during the anodic polarization in H_2SO_4 and after a treatment with Na_2MoO_4. It has been found that the ratio of Cr to Fe in the film is about three times higher than that in the bulk. The analysis of the valence states showed that the distribution of each constituent in the film is not uniform. The film has a three-layer structure.The outer layer is rich... | | 用XPS研究了1Cr18Ni9不锈钢表面氧化膜的组分与结构。实验表明膜中的Cr/Fe约为体内的3倍,并在组分和价态上具有不均匀的三层结构;表面层的主要成分为Cr,Fe的含氧氢氧化物;中间层的主要成分为Cr,Fe的氧化物;而过渡层则主要由金属状的Fe和少量Fe,Cr的氧化物组成。当阳极氧化膜用Na_2MoO_4溶液处理后,发现在整个氧化膜中都有Mo存在,其含置约为2%。表面层与中间层统称为阻挡层,它是不锈钢抗腐蚀的主要壁垒。过渡层介于阻挡层和基体之间,在这区域中有透过阻挡层进来的少量的氧存在。根据氧化膜中间层中Cr,Fe的氧化程度和过渡层中氧的含量与透入深度,讨论了阳极氧化膜与其它钝化膜(硝酸钝化膜和自然钝化膜)在抗腐蚀性能上差异的原因。 | | 文摘来源 | |   | | << 更多相关文摘 |
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