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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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| | In this paper, the friction and wear tests of GCr15 steel-45# steel pairs were conducted on a "ball-on-disc" testing machine using stepwise loading method under drop-feed lubrication of 20# engine oil. The critical load showing the transition of friction and wear states were recorded under the condition of different sliding speed. Based on the test results a new P-V diagram was obtained. The structure of surface oxide film for different states was analysed by means of Scanning Auger Micro-probe (SAM). In or... | | 作者在球-盘式摩擦磨损试验机上采用阶梯式加载和20~#机油滴注式润滑进行了GCr15钢球对45~#钢盘的摩擦磨损试验。通过摩擦系数的变化记录了在不同滑动速度下摩擦磨损状态发生转化时的临界载荷,从而获得了反映摩擦副摩擦学特性的P-V图,并用扫描俄歇微探针仪(SAM)研究了该摩擦副处于不同状态时表面氧化膜的结构,提出了钢表面氧化膜的结构层次模型,论证了钢的摩擦磨损特性与氧化膜结构之间的关系。 | | 文摘来源 | | The antiwear properties of potassium borate as an oil additive, the effect of dispersant calcium sulfonate on the antiwear property of potassium borate was evaluated using a Four-ball Machine. Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) were used to examine the composition and the valence state of boron on the worn surfaces. | | 作者利用Shell-Seta四球试验机研究了白油中所含硼酸钾的抗磨特性,以及分散刘中性烷基苯磺酸钙对硼酸钾抗磨性能的影响,并且利用X-射线光电子能谱仪(XPS)和俄歇电子能谱仪(AES)考察了摩擦表面的元素组成及硼元素的价态。结果表明,含硼酸钾的白油能够在摩擦表面形成含硼酸钾的表面膜而具有较好的抗磨性,硼在摩擦表面膜中以硼酸钾的形式存在,分散剂烷基苯磺酸钙会影响硼酸钾沉积腆的形成及其与金属表面的结合强度而降低抗磨性能。 | | 文摘来源 | | Six organic borates with different molecular chain length were synthesized and the friction and wear properties of these borates as oil additives were evaluated using a Timken Tester. Gas Chromatography (GO was adopted to investigate the decomposition of the borates, whereas EPMA and XPS were used to study the surface composition and valence state of boron on the rubbed surfaces. | | 作者合成了6种烷基链长不同的直链有机硼酸酯,并且利用Titaken试验机考察了它们用作润滑油添加剂的摩擦磨损性能;利用气相色谱仪(GC)对摩擦后的硼酸酯及摩擦产生的气体进行了分析;利用X-光电子能潜仪(XPS)和电子探针(EPMA)对摩擦表面进行了分析。Timken试验表明,硼酸酯有优良的减摩抗磨性能及较高的失效负荷,而且它们的分子链越长,减摩抗磨性能越好,失效负荷越高;GC分析表明,硼酸脂在摩擦过程中发生了碳链的降解并产生了小分子的气体;XPS和EPMA分析表明,硼以降解的硼酸酯的形式吸附于摩擦表面,而且硼酸脂的分子链越短,吸附于摩擦表面上降解的硼酸酯的分子也越短,但没有B_2O_3和FeB产生。 | | 文摘来源 | |   | | << 更多相关文摘 |
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