查询词典 first-order reaction

The optimum hydrolytic conditions of razor clam for neutral protease were : enzyme concentration 2.4%, hydrolysis temperature 50癈, substrate concentration 1:3, pH 7 and reaction time 6 hrs with the degree of hydrolysis and extraction rate of total nitrogen 42.46% and 83.04% respectively; and foracid protease they were: en/yme concentration 6.0%, hydrolysis temperature 50癈, substrate concentration 1:4, pH3.5 and reaction time 5 hrs with the degree of hydrolysis and extraction rate of total nitrogen 46.37% and 87.94% respectively, the hydrolysate being clear light yellow. For the combination of two kinds of proteases they were: first hydrolyzing with 2.6% f 1 avouryme for 3 hrs, then hydrolyzing with 2.4% neutral protease for 3 hrs with the degree of hydrolysis and extraction rtiie of total nitrogen 4-1.57% and 86.95% respectively.

最后综合考虑了水解率、总氮回收率和水解液的色泽、澄清度等指标，得出了较适宜的酶种为单酶以枯草杆菌中性蛋白酶和酸性蛋白酶效果较好，双酶以风味蛋白酶与枯草杆菌中性蛋白酶双酶组合水解效果较好，其适宜的水解工艺条件分别为：枯草杆菌中性蛋白酶加酶量为2.4%，水解温度50℃，料水比1：3，pH值中性条件下水解6h，绕蛙蛋白质的水解率和总氮回收率分别为42.46%和83.04%；酸性蛋白酶水解编蛙肉的适宜的工艺条件为加酶量6.0%、水解温度50℃，料水比l：4，pH值3.5条件下水解sh，水解率为46.37%，总氮回收率为87.94%，水解液呈较清澈的淡黄色；双酶采用先用2.6%风味酶水解3h后，再加入2.4%中性蛋白酶水解3h，水解率达44.57%，总氮回收率为86.95%。

We also found for the first time that the reaction between ketone and alcohol to ketal was catalyzed by benzamide and their derivatives, and the related mechanism is proposed. Furthermore, under the same irradiation condition, the photo-reaction of succimide with alcohol as well as the photolysis of benzene sulfonamide was also found and studied.

并首次发现在紫外光激发下，苯甲酰胺对酮和醇生成缩酮的反应有一定的催化作用，进而对一系列芳酰胺类化合物作了对比实验，发现芳酰胺类化合物均能对缩酮的生成有催化作用，并对芳酰胺的作用机理进行了初步探讨。

DTA analysis results showed that the first reaction was a thermite reaction of MoO3 and Al in the milling process, followed by a series of reactions to form Mo3Si and Mo5Si3 in the Mo-Si system.

DTA分析表明，复合粉体在机械化学反应过程中首先发生MoO3和Al之间的铝热反应，之后将发生一系列Mo和Si之间的反应，生成Mo5Si3和Mo3Si。

Produce the basic conditions for thermonuclear reaction, first nuclear fuel must be heated to a temperature high enough (several tens of millions of degrees), this time the nuclear fuel has been ionized into a mixture of electrons and ions, namely plasma; Second, we must binding them together so that they have conducted nuclear reaction time.

产生热核反应的基本条件，一是核燃料必须加热到足够高的温度，此时核燃料已被电离成电子和离子的混合体，即等离子体；二是要将它们约束起来使它们有进行核反应的时间。

The E-TOF will also be feasible and practical to assist chemists in screening the optimal reaction condition or evaluating the overall efficiency of different catalytic systems for a specific asymmetric reaction.4.For the first time,we explored chiralγ-hydroxy-α,β-acetylenic esters,which were prepared via asymmetric alkynylation,as key intermediates to the synthesis of chiralγ-butyrolactones. This convergent and enantioselective approach to chiralγ-butyrolactones is practical and easily handled with protecting group free.

这一概念包括反应产率、对映选择性、配体用量以及反应时间四个重要反应参数，不仅适用同一反应不同催化体系的横向综合性评价，而且适用于某一特定反应催化体系的优化过程，有助于研究人员选择最佳的反应条件。4、我们发展了以手性γ-羟基-α，β-炔酸酯为关键中间体完成了手性γ-丁内酯类天然产物的对映立体选择性全合成，该关键中间体能够以我们的催化体系方便的对映选择性合成，之后的官能团转换方法成熟，易于操作，无需进行繁琐的官能团保护和脱保护过程，绿色经济。

Analysis based on the experimental results demonstrated the plausible reaction mechanism is that vit C first converts Cu(superscript 2+) to its reduced state and vit C becomes vit C radical itself, thereby stimulating the formation of peroxyl and alkoxyl radicals, and bimolecular reaction of peroxyl radicals results in (superscript 1)O2 production in the systems studied.

根据实验观察的结果，分析了这一体系中(上标 1)O2形成的可能途迳，认为首先是维生素C将Cu(上标 2+)转变为还原态，而自身失去一个电子转变为维生素C自由基，从而刺激了过氧自由基和烷氧自由基的形成，过氧自由基的双分子反应很可能就是体系内(上标 1)O2产生的反应机制。

The activated or leached process and their influence elements are studied by 1DREACT software package of coupled mass/heat transfer and chemical reaction dynamics of water-rock interaction, according to the geological and geochemical characters of fine disseminated gold deposits.(1) Water-rock reaction time is not the important influence element of activating gold;(2) At first, activating capability of hydrothermal solution increases with the increasing of total sulfur activity; after lga〓≥-4, the content of activated gold in solution is mainly related to original content of gold in wall rock, and does not visibly dependent on total sulfur activity.(3) It is a complicated nonlinear process of influence of activating gold capacity of hydrothermal solution with the change of temperature, in general, 220 ℃ is most favorable to gold activation.(4) The influence of oxygen fugacity on gold activation has a multiple functions coupling nonlinear effect, in general, Igfo〓=-41 is most favorable to gold activation.(5) Solubility of gold in fluid decreases with the increasing of velocity of flow, the product of velocity and aurous solubility reaches maximum when velocity is 0.2～0.5m〓m〓. yr〓, i. e. this scope of velocity is most favorable to gold activation.

利用1DREACT水-岩相互作用反应-输运耦合动力学软件包，根据微细浸染型金矿床地质地球化学特征，计算机模拟研究了金的活化、浸取过程及其影响因素，发现：(1)金活化过程中水-岩反应时间不是其主要制约因素；(2)热液对金的活化能力开始随总硫活度的增高而增高，当lg a〓≥-4后，热液中活化金的含量将主要与围岩中金的初始丰度有关，而对总硫活度无明显依赖关系；(3)温度对热液浸金能力的影响是一个复杂的非线性过程，总体而言，220℃最有利于金的活化；(4)氧逸度对金活化的影响呈现出一种多因素叠加的非线性效应，总体而言，lgfo〓＝-41最有利于金的活化与浸取；(5)流体中金的浓度随流体流速的加快而降低，流速与金浓度的乘积在流速为0.2～0.5m〓m〓。yr〓时达到极大，即0.2～0.5m〓m〓。yr〓的流速范围最有利于本类矿床的金的活化。

The molar extinction coefficient, maximum absorption wavelength, reaction rate constants of trans-cis photochemical isomerization, thermal back-isomerization and photochemical back-isomerization and equilibrium constant of photochemical back-isomerization reaction of a novel photochromic liquid crystalline dendrimer G1 of the first generation containing nitroazophenyl groups on its periphery and small molecular azophenyl moiety M1 in solution were described.

张其震*1，盛昕1，李爱香1，王艳2摘要：研究了树外围含12个硝基偶氮苯基元新型一代碳硅烷光致变色液晶树枝状大分子G1和基元小分子M1在溶液中的最大吸收波长、摩尔消光系数、反-顺光化学异构化反应速率常数、热回复异构化反应速率常数、光化学回复异构化反应平衡常数及速率常数。

The experimental results from cyclic voltammetry and constant-potential electrolysis show that the mechanism of the reaction was two molecules and three steps electrochemical process with eight-electrons transferred: anion radical arose in the first step; two-electrons were transferred in the second step and accompanied with coupling reaction of radicals and protonation and dehydrate, the main product was azoxybenzene; two-electrons were transferred in the third step, and azobenzene was achieved.

研究结果表明，硝基苯在铂电极上的电还原反应为双分子八电子三步骤电化学过程：第一步反应为准可逆单电子转移步骤，产生阴离子自由基；第二步为二电子转移步骤，并伴有随后的双分子不可逆自由基偶合反应和快速质子化及脱水反应，主要产物为氧化偶氮苯；第三步是二电子转移产生偶氮苯的过程。

The thermodynamics quantities were calculated based on the first relaxation process. The results indicated that active enthalpy△H and active entropy △S all decreased with the increase of decrystallization extent. And, it was concluded that the relaxation process of untreated wood is for endothermic reaction and that of treated wood for exothermic reaction.

并通过计算获得了第一个松弛过程的各个热力学量，活化焓△H和活化熵△S都随着非晶化处理程度的增加而减小，未处理木材的松弛过程为吸热反应，而处理木材的松弛过程为放热反应。

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。