沉积层是指惰性膜沉积在石英砂粒外围的物质。沉积层有细粒物质、死粘土和灰分,牢固地聚集在砂粒上形成一层不平的外表层,使砂粒流动性能降低,型砂传递能量的效率减小,砂型紧实度不匀。 沉积层来源有大小河流携带到海中的土壤和基岩物质。在冰川溶化期,这种基岩物质就被带入大海,或者被风吹送到海中去。沉积层的其他来源是火山灰与熔岩、贝壳与生物骨骼、在海水中形成的化学沉积物以及宇宙尘埃等。
... acclimatized band 沉积层 not acclimatized 不服水土 acclimatized copse 风化材 ...
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The appearance,adhesion,hardness and corrosion resistance of the coating were tested by weighting,as well as the cross-sectional method to calculate the average thickness of sedimentary layers.
同时,对镀层进行了外观测试、结合力、硬度以及耐蚀性试验,用重量法以及横截面法计算了沉积层的平均厚度。
参考来源 - 基于SLA原型的低温化学镀镍工艺研究Tests show that the hardness and wearing resistance of the deposit layer are much higher than that of the matrix materials.
沉积工件的硬度和耐磨性能实验表明,沉积层的硬度和耐磨性显著高于工件基体。
参考来源 - 电火花沉积及其合金化The addition of acetonitrile, glycol (EG) and glycerin increased the electrolyte conductivity apparently. Simultaneously, glycol can enhance the quality of the deposit.
在EMIC-NiCl2溶盐中加入乙腈、乙二醇(EG)、丙三醇、N,N-二甲基甲酰胺后,能够显著地提高电解液的导电性,乙二醇还具有改善金属沉积层质量的作用。
参考来源 - 离子液体中以PAA为模板电沉积镍的研究·2,447,543篇论文数据,部分数据来源于NoteExpress
1980年,科学家首次在从尘云中沉淀下来的全球范围的沉积层中识别出这种撞击,这些尘云在撞击后围绕着地球。
Scientists first identified this impact in 1980 from the worldwide layer of sediment deposited from the dust cloud that enveloped the planet after the impact.
作为地质学家,我们研究地球表面的沉积层以估算过去地质时期的年代。
As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.
不同沉积层中保存的壳有不同的含量比例,显示出更新代海洋温度的变化。
Different ratios in the shells preserved in various layers of sediment reveal the temperature changes in the oceans during the Pleistocene epoch.
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