查询词典 SN

It is the basic reason of increase oxidation that the appetency of Sn-0.7Cu with oxygen is larger than Sn-37Pb and the surface film is loose.

指出Sn-0.7Cu合金与氧的亲和力大于Sn-37Pb，且表面氧化膜疏松，是造成氧化速度快的根本原因；提高表面膜的致密度，是降低氧化反应的根本措施。

When the molar fraction of SnO2 is 83%, the main component of the coating isO2 solid solution with rutile structure. When the molar fraction of SnO2 is 44%, the main components of coating are theO2 solid solution with rutile structure andO2 solid solution with fluorite structure. When the molar fraction of SnO2 is 17%, the main component of the coating isO2 solid solution with fluorite structure. Annealed at higher temperature than 450 ℃, CeO2 is found in the coating containing 83%Sn, and there is not SnO2 in the coating containing 83%Ce, which suggests that fluoriteO2 has higher thermal stability than rutileO2. When the molar fraction of SnO2 increases, the dispensability of the coatings is improved greatly.

结果表明：通过控制制备条件可获得具有纳米结构的钛阳极涂层；当Sn的摩尔分数为83%时，涂层主要为金红石相的O2固溶体；当Sn的摩尔分数为44%时，涂层中金红石相O2固溶体和萤石结构的O2固溶体共存；当Sn的摩尔分数为17%时，涂层由萤石结构的O2固溶体组成；高于450 ℃退火时，含83%Sn的涂层中出现CeO2相，而在含83%Ce的涂层中没有出现SnO2相，表明在相同的溶质浓度下，萤石结构的O2固溶体比锡基金红石相O2固溶体具有更好的热稳定性；而涂层中的SnO2具有明显改善涂层分散性的作用。

This name is very quickly popular, because it refers comes from these the country which is affected Spain moreover style each different music: Rumba music, Són Montuno, Guaracha, graceful wave music, exactly, Danzón, són, Guguanco, Cubop, melon Shirra dance music, Cumbia, Plena, Bomba, Festejo, plum Lunger dance music and so on.

这个名称很快流行起来，因为它指来自于那些受西班牙影响的国家而且风格各异的音乐：伦巴乐曲、Són Montuno、Guaracha、曼波音乐、恰恰、Danzón、són、Guguanco、Cubop、瓜希拉舞曲、Cumbia、Plena、Bomba、 Festejo、梅伦格舞曲等。

In this study the meadow brown soil in northeast China was picked up as the object, through the research of Sn, Hg, Sb, and Bi desorption kinetics behavior in single and combined polluted soils we explored the desorption characters and rules of Sn, Hg, Sb, and Bi in polluted soils.

文章以我国东北地区草甸棕壤作为研究对象，通过对Sn、Hg、Sb、Bi单一及复合污染土壤中Sn、Hg、Sb、Bi的解吸动力学行为的研究，探索污染土壤中重金属Sn、Hg、Sb、Bi的解吸特性与规律。

In chapter 2, we prove that sn—first countable spaces are preserved by the finite subsequence-covering mappings.By this result, we prove that the finite subsequence-covering, quotient mappings preserve g—metrizable spaces, also prove that the finite subsequence-covering, closed mappings preserve sn—metrizable spaces, g-metrizable spaces, metrizable spaces, point-countable bases.

在第二章中，我们主要证明了有限子序列覆盖映射保持sn-第一可数空间，作为它的应用，又证明了有限子序列覆盖、商映射保持g-第一可数空间，也证明了有限子序列覆盖闭映射保持sn-度量空间，g-度量空间，度量空间，点可数基。

In addition to, the thinness of the intermetallic layers of Sn-Ag-Cu with the copper plate are compared with that of Sn37Pb. The results show that Ag、Cu has influence on the solidus temperature, spreading property, electrical conductivity of alloy. The solder shows more favorable combination property as content of Ag is 3% and content of Cu is 2.8%.

在众多无铅焊锡合金中，Sn-Ag-Cu系无铅焊锡合金以其优良的润湿性能及力学性能已被普遍认为是最有潜力的含铅焊锡合金的替代品，一些大的科研机构和制造商纷纷推出自己所推崇的Sn-Ag-Cu合金成分，例如：美国AMES 实验室选用的合金成分为Sn-4.7Ag-1.7Cu[1]，Ericsson公司选用的合金成分为 Sn-3.8Ag-0.7Cu[2]。

The anode catalyst for direct methanol fuel cell is Pt-W-Sn/C, and it is prepared through dispersing carbon black in distilled water, adding H2PtCl6, tungstate and stannate, stirring to make the metal salt and H2PtCl6 adsorbed fully; dropping reductant to reduce and deposite until complete reaction; washing with distilled water, filtering and drying to obtain black C carried sanitary Pt-W-Sn catalyst. The catalyst has excellent methanol catalyzing activity and low cost, and its use can lower the cost of direct methanol fuel cell greatly and raise the performance/cost ratio of the cell.

一种直接甲醇燃料电池阳极催化剂是Pt-W-Sn/C；其制备方法是将碳黑分散在蒸馏水中，然后加入H2PtCl6、钨酸盐和锡盐，搅拌使得金属盐与H2PtCl6被充分吸附；逐滴加入还原剂使之还原沉积，待反应完全后，用蒸馏水洗涤，过滤，然后于干燥箱中干燥，便得到黑色的C负载Pt-W-Sn三元催化剂；该催化剂具有很好的甲醇催化活性，价格低廉，可以大大降低直接甲醇燃料电池的成本，提高电池的性能价格比和市场竞争能力。

The Pt-Sn/CCA and Pt-Sn/γ-Al2O3 catalysts were prepared by impreg nation method. The acti vity at 300 ℃ or 350 ℃ and the stability at 450 ℃ of the catalysts were evalu ated, and the structure of Pt-Sn/CCA catalyst was generally studied.

采用共浸法制备了Pt-Sn/CCA催化剂，利用在线色谱微反实验装置评价了此类催化剂对甲基环己烷脱氢反应的活性和抗炭性能，初步研究了Pt-Sn/CCA催化剂的物理化学结构。

The results show that Sb addition can diminish the crystal grain, but the content of segregative phase at crystal boundary increases, and the current efficiency of material is low. Compared with Sb addition, Sn addition can also diminish the crystal grain, the current efficiency increases, the content of segregative phase at crystal boundary reduces, but diffusional corrosion of the anode surface is not uniform. The cooperation of Sb and Sn can prevent Si from segregating effectively and enhance the current efficiency obviously. At the same time, anode materials have preferable surface dissolution characteristics.

结果表明： Sb具有细化晶粒的作用，但晶界存在较多偏析相，电流效率偏低；与Sb相比较， Sn也具有细化晶粒的作用，电流效率有所提高，晶界偏析相较少，但阳极的表面腐蚀溶解不均匀； Sn和Sb的协同作用在于能有效地抑制Si的偏析，显著提高阳极的电流效率，使得阳极表面具有良好的腐蚀溶解性。

In most animal fats the 16:0 acid is preferentially esterified at the sn - 1 position and the 14:0 at the sn- 2 position.

在大多数动物脂肪中，16：0酸优先在sn-l位酯化，而14：0在sn-2位。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失