硫化物

The influence of promoters La and Ce on 〓 and CoS〓-TiO〓 catalyst is further analyzed.

重点分析了助剂La和Ce对氧化物催化剂〓和硫化物催化剂CoS〓-TiO〓的性能影响。

The preparation method of sulfide standard solution was studied with improved elthylene blue method and total differential spectrophotometric method .

用改进的乙基蓝法和用全差示光度法，研究了硫化物标准溶液的配制方法。

Its beneficial widespread effect on health is attributed to sulphur compounds and particularly to thiosulfinates. Odorless and stable, alliin is the most abundant sulfur compound in whole, unbruised Garlic. When the clove of garlic is cut or crushed, the enzyme alliinase is released from its compartment and transforms S-allyl-L-cysteine sulfoxide or alliin into diallyl thiosulfinate allicin, the characteristic compound of garlic flavor. This very unstable thiosulfinate is rapidly degraded to related organosulfur compounds. Allicin is often thought of as the "active ingredient" in Garlic, and has been the subject of numerous scientific studies, but its a fairly unstable compound that likes to react with itself.

蒜氨酸(S-烯丙基-L-半胱氨酸亚砜，alliin)是完整、未受损大蒜里面含量最丰富的硫化物，并且非常稳定，它存在于大蒜的细胞质里；当细胞受损时，蒜氨酸酶从细胞液向细胞质释放，蒜氨酸和蒜氨酸酶接触被迅速转化为一系列新的化合物—蒜辣素及其相似物，蒜辣素(双烯丙基硫代亚磺酸酯，allicin)被认为是大蒜中最重要的活性成分，但它相当不稳定，易于自身反应。

It exists uncombined in two stable allotropes, one gray and one yellow, but is more often found in nature as the sulfide or oxide.

它存在两种稳定同素异性体，即灰砷和黄砷，但大多发现于自然界的硫化物和氧化物中。

At present,the rate laws and reaction mechanisms of pyrite oxidation,pyrite and chalcopyrite formation,uraninite and magnetite dissolution in aqueous solutions are mainly studied,and it is discovered that (1)oxidation rate of pyrite controlled by surface reaction assume fractional dependence on Fe3+ and O2 molalities in acid solutions;(2)Pyrite cannot nucleate directly from solutions below 300 ℃,it can only form initially through sulfidation of a FeS precursor. The rate equation of reaction between FeS and H2S to form pyrite is of the second order;(3)Chalcopyrite is formed by reactions of pyrrhotite or pyrite with Cu2+,the former proceeds via a series of mediate metastable phases of Cu-Fe sulfide,whereas the rate equation of the latter is apparently of the first order which is controlled by surface reaction;(4)The nonlinear behavior of magnetite dissolution at acid pH can be represented by a shrinking core model coupling with surface reaction and diffusion transport.

目前主要研究了水溶液中黄铁矿氧化、黄铁矿和黄铜矿形成、晶质铀矿和磁铁矿溶解的速率定律和反应机理，发现：(1)酸性溶液中黄铁矿的氧化速率对Fe3+和O2浓度呈分数依赖并受表面反应的控制；(2)低于300 ℃时黄铁矿不能从溶液中直接成核，而需初始地通过FeS先驱物的硫化生成，FeS与H2S反应形成黄铁矿的速率方程为二级；(3)磁黄铁矿或黄铁矿与Cu2+反应均可形成黄铜矿，前者经历了一系列准稳的Cu-Fe硫化物的中间物，后者的速率方程为表观一级并受表面反应的控制；(4)酸性pH时磁铁矿的非线性溶解行为可采用表面反应扩散输运耦合的收缩核模型来描述。

The density of quartz-sulphide veining was also a determining factor on the grade of the gold.

密度石英硫化物成脉络也是一个决定因素在金子的等级。

The influences of various reductive organic impurities, such as amines, phenols and sulfur compounds on the stability of HPAM aqueous solution have been studied by viscosimetry.

对各种还原性有机杂质如胺、酚和硫化物对 HPAM水溶液稳定性的影响进行了研究。

ABSTRACT :The influences of various reductive organic impurities , such as amines , phenols and sulfur compounds on the stability of HPAM aqueous solution have been studied by viscosimetry .

对各种还原性有机杂质如胺，酚和硫化物对HPAM水溶液稳定性的影响进行了研究。

Based on the previous research, this article discussed the sulphide, the nitrate, organic pollution heavy metal and volcanic dust, etc., which tie up to the human activity.

本文在总结前人研究的基础上，重点讨论了硫化物、碳黑、氮氧化物及硝酸盐、有机污染物以及重金属等大气中与人类活动密切相关的微粒物质

Zine'.'' pyrithione or selenium sulphide, and even stronger shampoos containing tar or salicylic acid.

锌'。''的硫化铁矿物质或含有硒的硫化物，甚至含有焦油和水杨酸的强力洗发精。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。