查询词典 first order reaction

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。

Consecutive first-order reaction ; the ratio of the rate coefficient ; steady-state approximation ; computer simulation

一级连续反应；速率系数比值；稳态近似法；计算机模拟

The result showed that the degradation of polyitaconic anhydride in phosphate buffer solutions was the first-order reaction, and its degradation apparent constants were 0.0498, 0.0576 and 0. 1382h~(-1) in ph...

结果表明，聚衣康酸酐在磷酸缓冲溶液中的降解符合一级反应动力学规律，在pH值为5、7.4和8.8的缓释溶液中的表观速率常数分别为0.0498、0.0576和0.1382h~(-1)。

During the process of consecutive first-order reaction, the trend of the intermediate is largely determined by the ratio of the rate coefficient; therefore this case leads to an important method:steady-state approximation.

在连续反应中，速率系数的比值很大程度上决定了中间产物浓度的走向，并由此引出了一个重要的方法：稳态近似法。

The experimental results indicated that SDBS could increase the degradation rate and the first-order reaction rate constant was positively related to the logarithm of concentration of SDBS.

实验表明：涕灭威在表层土壤中的降解速率明显快于深层土壤，在未灭菌土壤中的降解速率明显快于灭菌土壤，微生物在涕灭威的降解代谢中起重要作用。

The Relationship of Peak Temperatures of DTG, DTA and DSC Curves in a First-Order Reaction

篇名 Ⅰ级反应DTG，DTA与DSC曲线峰顶温度关系的研究

Results The decrease in the molecular weight of HA and its solutions at different pH when heating was complied with the first-order reaction of kinetics.

结果 加热法促使透明质酸钠粉末、溶液及不同pH值溶液的相对分子质量的降解反应为一级反应。

The kinetics for degradation of HCB by UV/Fenton oxidation conforms to pseudo first-order reaction equation.

UV辐射与Fenton氧化对HCB的降解具有协同效应。

The results of the experiments show that the photocatalytic activation of T-ZnO whiskers accords with the rule of first-order reaction,and the optimal concentration of T-ZnO whiskers is 2g/L.

研究了四针状氧化锌晶须在紫外光照射条件下对甲基橙的降解活性，考查了甲基橙溶液初始浓度、催化剂浓度及种类等对光催化降解的影响，并初步探讨了其反应动力学。

Mg and 18.41 mg, respectively. Absorption of ginsenosides in the ginsenosides liquor basically followed first-order reaction of kinet-ics.

结果与讨论在3小时中每只大鼠吸收的人参皂甙平均值分别为21.79mg和平共处8.41mg。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。