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elimination mechanisms
相关语句
  淘汰机制
     The Study on Establishing and Practising the Elimination Mechanisms in Postgraduates-cultivating
     建立并实施研究生培养淘汰机制的研究
短句来源
     The postgraduate education in China has got boomingly developed recently, meanwhile, people becomes more and more concerned about the qualities of the postgraduates-cultivating. One of the effective measures to safeguard the educational quality is to establish the elimination mechanisms in the postgraduate educational system and implement them.
     我国研究生教育蓬勃发展的同时,研究生教育的质量也日益引起人们的关注,在研究生培养中建立并实行淘汰机制是保障研究生教育质量的一个有效途径。
短句来源
     This paper starts from the history of the Chinese postgraduates education, illustrating the thought-provoking phenomena existing in the postgraduate education and analyzing the causing factors profoundly, then it demonstrates the necessity and feasibility of establishing the elimination mechanisms not only from the basis of the theory, but from the practice.
     本文回顾了我国研究生教育的历史,剖析了我国研究生教育中现存的问题,从教育生态学的胜汰原理等理论和中外淘汰实践两个方面论述了建立研究生培养淘汰机制的必要性和可行性,并指出研究生淘汰机制建立应该遵循系统性、动态性以及灵活性原则。
短句来源
     To make a summary: 1 .It is indispensable to introduce the elimination mechanisms into the post-graduates-cultivating;
     本文最后的结论:1.我国研究生培养中应该积极引入淘汰机制以保障研究生教育质量;
短句来源
     3.The elimination mechanisms are innovation and concepting to our administration of Chinese postgraduates, owing to its establishment will play great influence on the tutor system and the estimation system and so on.
     3.研究生淘汰机制是对我国研究生教育管理制度的完善、发展和创新,它的建立必将促进导师制、完全学分制、研究生质量评估制的创新和改革。
短句来源
  “elimination mechanisms”译为未确定词的双语例句
     Ab Initio Studies on the Thermal Elimination Mechanisms of Two Groups of Carboxylic Acids and Substituted Pyruvic Acids
     取代羧酸和酮酸热消除机理的从头算研究(英)
短句来源
  相似匹配句对
     On Mechanisms
     机制论
短句来源
     The Study on Establishing and Practising the Elimination Mechanisms in Postgraduates-cultivating
     建立并实施研究生培养淘汰机制的研究
短句来源
     HARMONICS AND ELIMINATION
     谐波与抑制
短句来源
     Fluorosis and its Elimination
     氟中毒及其治理
短句来源
     Mechanisms of immunotolerance
     免疫耐受的形成机制
短句来源
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  elimination mechanisms
The reactions which result in carbon-halogen bond cleavage include substitutive, reductive, oxygenative, and gem-elimination mechanisms.
      
Drug clearance was independent of the dose given and equal to 109±65 l/h, indicating no possible saturation of metabolism and elimination mechanisms at these high-dose levels.
      
Gadolinium based MRI contrast agents are considered very safe due to their well known pharmacologic properties and elimination mechanisms.
      
The location of probenecid-sensitive elimination mechanisms of monoamine metabolites from the cerebrospinal fluid of the cat was determined with ventriculo-cisternal or ventriculo-lumbar perfusion techniques.
      
The aim was to understand better the relationship between drug elimination mechanisms and interpatient variation in drug exposure.
      
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The oxidation of pyridinecarbinols and its acetate with pyridine N-oxide has been studied. The reaction between the N-oxide group and the alcoholic group can be intramolecular or intermolecular, the resulting aldehyde can be obtained by heating the reactants at about 200~220℃ under pressure. A nucleophilic elimination mechanism is proposed.

应用吡啶类N-氧化物将一系列吡啶甲醇氧化成相应的醛,醇基和N→0基可处在或不处在同一分子中,提出了亲核消除的反应机制。

It is known that there are many examples of the thermal elimination of quaternary ammonium hydroxides which do not follow the Hofmann rule. Ye Xiulin et al. proposed the "conformation rule" for the elimination of quaternary ammonium hydroxides, and then, eight quaternary ammonium hydroxides were synthesised and subjected to the elimination. The results show that the conformational rule is superior and acceptable.DPCILO and CNDO/2 methods were used to calculate the conformational energy of some...

It is known that there are many examples of the thermal elimination of quaternary ammonium hydroxides which do not follow the Hofmann rule. Ye Xiulin et al. proposed the "conformation rule" for the elimination of quaternary ammonium hydroxides, and then, eight quaternary ammonium hydroxides were synthesised and subjected to the elimination. The results show that the conformational rule is superior and acceptable.DPCILO and CNDO/2 methods were used to calculate the conformational energy of some quaternary ammonium cations with different conformations and the distribution of charge for studying the mechanism of Hofmann elimination reaction.The results show that the conformational rule, based on the conformational energy, can be used to explain the Hofmann elimination reaction well, but the elimination of straight chain alkyl groups other than the ethylic groups should follow cis-E2 elimination mechanism instead of trans-E2 one proposed by Ye Xiulin.

本文用DPCILO,CNDO程序分别计算了一些第四级铵离子不同构象的能量及电荷密度,探讨Hofmann消除反应的机理,结果表明构象规则能较好地说明Hofmann消除反应的机理,只是“直链型”烷基的消除反应应按顺式E2机理进行。

A composile HZSM-5 zeolite/asbestos catalyst, tiny HZSM-5 zeolite particles embedded in the asbestos fiber remnants, was Synthesized by hydrothermal method with asbestos as silicon resource, tetrabulylammonium bromide as a template, sodium aluminatc, sodium hydroxide and water. Their crystalline phase, morphology, composition, acid and base properties and so on were characterized by XRD, SEM, IR, TPD, BET gravimetric adsorption and activity evaluation. The results showed that the high selectivity of the composite...

A composile HZSM-5 zeolite/asbestos catalyst, tiny HZSM-5 zeolite particles embedded in the asbestos fiber remnants, was Synthesized by hydrothermal method with asbestos as silicon resource, tetrabulylammonium bromide as a template, sodium aluminatc, sodium hydroxide and water. Their crystalline phase, morphology, composition, acid and base properties and so on were characterized by XRD, SEM, IR, TPD, BET gravimetric adsorption and activity evaluation. The results showed that the high selectivity of the composite catalyst for low er olefins in methanol conversion was due to the synergistic effect of acid sites on the external surface of zeolite and the basic sites of MgO on asbestos remnants. Olefin formation was explained by an α-elimination mechanism, the scission of the methanol bond was facilitated by the cooperation action of acidic and basic sites on the boundary between zeolite and asbestos.

以石棉为硅源,四丁基溴化铵为模板剂以及铝酸钠、氢氧化钠和水,用水热法合成了一种ZSM-5沸石嵌入石棉的复合HZSM-5沸石/石棉催化剂。在287℃下,该复合催化剂上的甲醇转化反应仍有着较高的低碳烯烃(C_2~=—C_4~=)选择性,是与它的表面上有酸中心(沸石的外表面上)和碱中心(石棉上的MgO)共同存在有关。甲醇分子价键在这种沸石和石棉交界处的酸、碱中心协同作用下易于断裂,以α-消去反应的机理生成烯烃。

 
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