查询词典 sulfur

The calculational results are in good agreement with the X-ray data and show that different substitute group results in different charge distribution, the exocyclic sulfur atom has the biggest negative charge value and this site is the most likely site of protonation and methylation as well as the potential coordination site with metallic ions.

计算结果与X-射线衍射数据相符合，并显示虽然不同的取代基导致了不同的电荷分布，但四唑环外的硫原子总是具有最大的负电荷分布，从而使其成为最有可能的质子化、甲基化及与金属离子进行反应的点位。

High sulfur gas reservoir;natural gas hydrate;formational mechanism;prediction methods;prevention

高含硫气藏；天然气水合物；生成机理；预测方法；防治

Among them,the major transformations what against the sulfur flotation include: concentrating of zinc tailings,adding acid,non-featured operations,using 11# oil as frother ,the remodelling of flotator,etc.

其中，针对硫浮选进行的改造主要有锌尾浓缩、加酸、无精选作业、起泡剂11#油的应用以及浮选机改型等等，取得了显著的效果。

He sample is dissolved in a mixture of nitric acid and potassium chlorate.The determinations of Te,Bi,Fe and Cu are performed on a flame atomic absorption spectrophotometer.The selenium is determined photormetrically with 3,3'-diaminobenzidine,and the sulfur is determined gravimetrically as barium sulfate,precipitated frorm an EDTA-citric acid medium.

辉碲铋矿物经HNO＿3－KCIO＿3溶解，用火焰原子吸收法或乙二胺四乙酸二钠络合滴定法测定Bi，火焰原子吸收法测定Te、Fe、Cu，3，3＇二氨基联苯胺光度法测定Se，硫酸钡重量法测定S。

The photocatalytic degradation rate of heptene increased with increasing the initial concentration of sulfur dioxide, but maintained almost a constant beyond a certain concentration.

同时研究了庚烯和二氧化硫的初始浓度、氧气和水蒸气的不同含量及光强等因素对其光催化氧化降解的影响。

When the concentration of sulfur dioxide was fixed, the reaction rate increased separately with increasing oxygen content and water vapor content, when oxygen content was 20%, the reaction rate was the highest, while water vapor content was 444μmol/L, there was an optimum value for the photocatalytic degradation rate of heptene.

庚烯的降解速率随着二氧化硫浓度的增加而增加，最终趋于稳定。在二氧化硫浓度一定时，庚烯的反应速率分别随着氧气和水分子含量的增加而不断增大，氧含量为20%时速率最大；水分子含量为444μmol/L时速率最大。

Hexahydroxy N-containing heterocyclic compound without sulfur and phosphorus was synthesized and its structure was characterized.

欧阳平，陈国需，李华峰，无硫、磷的六元含氮杂环化合物用作润滑油多效添加剂的研究

Wherein X is an oxygen atom or a sulfur atom; C*, C** and C*** are asymmetric carbons; R 1 , R 2 , R 4 , R 5 , R 8 , R 9 and R 10 are each a lower alkyl group optionally having substituent and the like, or R 4 and R 5 and the like in combination optionally form a homocyclic ring optionally having substituent and the like; R 3 is an aryl group optionally having substituent and the like; R 6 and R 7 are each a hydrogen atom and the like; Nu is -CR 16 (COR 17 )(COR 18 ) wherein R 16 , R 17 and R 18 are each a lower alkyl group optionally having substituent and the like, and the like; and EWG is an electron withdrawing group.

通式中，X代表氧或硫；C *、C **和C ***分别表示不对称碳；R 1 、R 2 、R 4 、R 5 、R 8 、R 9 和R 10 分别代表任选取代的低级烷基等，条件是例如R 4 和R 5 可以相互结合形成任选取代的同素环等；R 3 代表任选取代的芳基等；R 6 和R 7 分别代表氢原子等；Nu表示-CR 16 (COR 17 )(COR 18 )(其中R 16 、R 17 和R 18 分别代表任选取代的低级烷基等)等；并且EWG表示吸电子基团。

Antimony samples were dissolved by aqua regia, hydrobromic acid, and hydrochloric acid step wisely, converting sulfur in the samples into sulfate.

方法采用王水，氢溴酸，浓HCl等试剂将锑样溶解，并使锑样中的硫转化为SO42-，低温加热蒸干，使锑完全挥发。

This article introduces the EH-3 medium-temperature sulfur-resistant hydrolyst and ambient-temperature fine desulfurization and their application in Texaco water gas.

介绍了EH-3中温耐硫水解催化剂及常温精脱硫的流程及在德士古水煤气中的运行情况，各项指标工艺要求，值得推广使用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。