酸性

Therefore, the previous data of heats of formation of polynitrocubanes estimated from groupadditivity method are corrected.3. Calculations indicate that, for polynitrocubanes, there are parallel relationships between their experimental kinetic acidities pKa, the average s characters in the exocyclic carbon orbital used for the C-H bonds within each molecule, and the average C-H stretching frequencies within each molecule.

计算结果表明，多硝基立方烷的实验动力学酸性pK_a、分子内用于形成C-H键的环外碳轨道平均s成分和分子内的平均C-H伸缩频率之间，存在平行的递变关系，这对基于s_a或v_a的数值预估动力学酸性pK_a、进而指导多硝基立方烷和其它相关化合物的合成有助。

Therefore, the previous data of heats of formation of polynitrocubanes estimated from groupadditivity method are corrected.3. Calculations indicate that, for polynitrocubanes, there are parallel relationships between their experimental kinetic acidities pKa, the average s characters in the exocyclic carbon orbital used for the C-H bonds within each molecule, and the average C-H stretching frequencies within each molecule.

计算结果表明，多硝基立方烷的实验动力学酸性pK_a、分子内用于形成C-H键的环外碳轨道平均s成分和分子内的平均C-H伸缩频率(来源：AB0eC论文网www.abclunwen.com)之间，存在平行的递变关系，这对基于s_a或v_a的数值预估动力学酸性pK_a、进而指导多硝基立方烷和其它相关化合物的合成有助。

To explore the expression of neuron specific enolaes, S protein(S100) and glial fibrillary acidic protein in retinoblastoma and its clinical significance.

目的探讨神经元特异性烯醇化酶、酸性钙结合蛋白(S100)及胶质纤维酸性蛋白在视网膜母细胞瘤中的表达及临床意义。

Altogether 26 kinds of proteolytic enzymes were found in the digestive system of Grus grus in all pH value conditions.

灰鹤消化系统蛋白水解酶的活性受pH值的影响和制约，在中性条件下酶活性最强，酸性条件下最弱，总的酶活性表现为中性〉碱性〉酸性；3。

In acidic aquatic environment, hydrotalcite and its calcined product can also play a role in neutralizing H(superscript +) ions and sorbing anions.

在酸性环境下，水滑石及其焙烧产物在对阴离子的吸附过程中都有中和酸性溶液的作用。

The early stage of the Yanshan movement generated an Early Jurassic downfaulted basin and a Middle Jurassic compressional-downwarped coalaccumulating basin.In the middle stage,the Mid-Late Jurassic witnessed the formation of a volcanic downfaulted basin bounded by NW and NE deep faults,intermediate-basic and acid volcanic eruption and hypabyssal and near-sur...

燕山运动早期形成早侏罗世断陷盆地和中侏罗世挤压坳陷型聚煤构造盆地；中期中晚侏罗世形成被NW、NE向深大断裂围限的火山断陷盆地，中基性—酸性火山喷发和浅成、超浅成中酸性岩浆侵入，晚侏罗世末形成了一系列NNE向褶皱和逆冲推覆构造带；晚期早白垩世再次形成断陷盆地和开阔平缓褶皱，义县组不整合在火山岩之上，晚白垩世处于挤压造山后的山体隆升阶段，左云组不整合在义县组之上，伴随有壳源型花岗岩侵入，NW、NE向断裂复活，形成地堑、地垒式断裂组合，导致山体隆升。

Acidic ion-acidic resin can also be used as a catalyst for organic synthesis, it's used instead of concentrated sulfuric acid can be catalyzed synthesis of dihydro-coumarin compounds [1], High purity isopropenyl acetate [2] and other organic compounds.

酸性离子酸性树脂也可作为一种有机合成催化剂，用它替代浓硫酸可催化合成二氢香豆素类化合物[1]，乙酸异丙烯酯[2]等有机化合物。

By study of the medium-acid plutonic rock and its maric microgranular enclaves of the middle Gangdis〓 belt, this dissertation will discuss the characteristics of the Gangdis〓 medium-acid plutonie magmatism and the crust/mantle dynamics during uplifting of Tibetan Plateau from the sight of material and energy, and use'lithoprobe'to connect crust and mantle interaction and other geologic events.

中、新生代青藏高原岩浆活动强烈，沿雅鲁藏布江缝合带形成了著名的冈底斯构造—岩浆带，本篇博士论文以冈底斯带中酸性侵入岩及其中铁镁质微粒包体为研究重点，探讨冈底斯带中酸性侵入岩浆活动特征，从物质和能量的角度论述了高原隆升过程中的壳/幔动力学过程，利用&岩石探针&将壳/幔之间的相互作用和地质事件有机地结合起来。

The proton affinity calculations showed that the acidity of isomorphously substituted mordenite increases in the order:BMORGaMORAlMOR.

质子亲合势分析表明与硅铝丝光沸石相比， B和Ga进入骨架导致丝光沸石分子筛的Brnsted酸性有所减弱，其酸性依次为：BZSM5GaZSM5AlZSM5。

In order to discover acid-tolerant Rhizobium meliloti that can nodulate alfalfa high-effectively on acidic soil, researches were explored to isolate rhizobia from alfalfa nodules on acidic soil (pH5.2), methods based on the thesis of adaptive acid-tolerance response of the Rhizobia were adopted, six strains were isolated, which could grow on solid medium with pH4.8 steadily. In addition, the nodulation characteristics, growth curves and mean generation time under different acidity of the strains were examined.

为获得能够使紫花苜蓿在酸性土壤中高效结瘤的耐酸根瘤菌，该研究从酸性土（pH5.2）上生长的紫花苜蓿根瘤中分离到若干菌株，利用根瘤菌对酸的适应性耐受反应筛选到六株能够在pH4.8的固体培养基上稳定生长的菌株，并检测了这六株菌的结瘤特征、不同酸度下的生长曲线和平均代时。

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。