查询词典 benzene

The Ea for the formation of ethoxide intermediate was 170.34 kJ/mol. Alkylation of benzene with ethylene occurred through both concerted mechanism and stepwise mechanism, and they were competitive to each other. These two paths were only slightly different in the activation energy.

而乙烯作为烷基化剂与苯反应时同时存在联合机理和分步机理，且二者之间存在一定程度的竞争，其中联合机理的活化能为167.24 kJ/mol，分步机理速控步骤的活化能为155.20 kJ/mol。

Results The five purified ginkgolic acid monomers were GA13:0.,GA15:0.,GA15:1 ,GA17:1 and GA17:2 ,with a side chain of 13,15,17 alkyl or ethylenic radicals respectively on their benzene loop.

结果纯化的银杏酸5个同系物单体为GA13：0、GA15：1、GA15：0、GA17：1和GA17：2，其母核苯环上分别有1个13、15及17烷基或烯基的侧链。

Two reasons can be explained the improvements of catalytic activities after the addition of Ce. One is the increase of the thermal stability of Ni-B and Ni-P nanoamorphous alloys, which retards the nanocrystalline Ni to aggregate during the exothermal reaction of benzene hydrogenation. The other is to make their grain sizes smaller, thus it increases the number of activity center in unit mass.

说明加入Ce提高催化活性的主要作用有两方面，一是提高Ni-B和Ni-P纳米非晶态合金的热稳定性，抑制催化苯加氢反应时大量放热促使纳米晶Ni的聚集长大；二是使生成的Ni-B和Ni-P纳米非晶态合金颗粒更为细小，从而增加单位质量样品的活性中心数量。

RESULTS: All aromatic anesthetics inhibited I at a holding potential which produce half-maximal current V(1/2; inhibition was modest with 1,3,5-trifluorobenzene (8%+/- 2%), pentafluorobenzene (13%+/- 2%), and hexafluorobenzene (13%+/- 2%), but greater with benzene (37%+/- 2%), fluorobenzene (39%+/- 2%), 1,2-difluorobenzene (48%+/- 2%), 1,4-difluorobenzene (31 +/- 3%), and 1,2,4-trifluorobenzene (33%+/- 1%).

结果：在最高电流的一半的控制电压下所有芳香族麻醉药都阻断钠电流；均苯三酚（8%+/- 2%）、戊苯(13%+/- 2%)、戌苯(13%+/- 2%)的抑制是适度的比苯(37%+/- 2%)、氟苯(39%+/- 2%)，1.2-二氟二苯(48%+/- 2%)，1，4-二氟二苯(31 +/- 3%)，和1，2，4三氟苯(33%+/- 1%)明显。

To test this hypothesis, we measured the effect of IV infusion of the NMDA blockers dizocilpine (MK-801) and-4-(3-phosphonopropyl) piperazine-2-carboxylic acid to decrease the MAC (the minimum alveolar concentration of anesthetic that prevents movement in 50% of subjects given a noxious stimulation) of 8 conventional anesthetics (cyclopropane, desflurane, enflurane, halothane, isoflurane, nitrous oxide, sevoflurane, and xenon) and 8 aromatic compounds (benzene, fluorobenzene, o-difluorobenzene, p-difluorobenzene, 1,2,4-trifluorobenzene, 1,3,5-trifluorobenzene, pentafluorobenzene, and hexafluorobenzene) and, for comparison, etomidate.

为了验证这个假说，我们检测静脉注射 NMDA 阻滞剂 MK-801和 CPP 来降低8种常规吸入麻醉药（环丙烷，地氟醚，安氟醚，氟烷，异氟醚，一氧化二氮，七氟醚和氙）和8种芳香族化合物（苯，氟苯，邻二氟苯，对二氟苯， 1，2，4-三氟苯， 1，3，5-三氟苯，五氟苯和六氟苯的 MAC 值，依托咪酯作为对照组。

Chapter 2 has analysized the conversly synthetic means of solanesol and designed novelly synthetic routes of solanesol and key intermediate Chapter 3 has summarized the preparation of trans-3-methyl-4-hydroxy (bromo-2-butenyl oxy methyl benzene In chapter 4 ,a novel technology of important intermediate(all trans-8-bromo geranyl acetate),which is suitable for industrial procedure , was found .meanwhile,an another new way has been invented ,of which the key intermediate (all trans-8-hydroxy geranyl acetate) has been produced.

第二部分分析了茄尼醇的逆合成方法，设计了一条适合于合成茄尼醇的合成路线及其重要中间体的合成路线。第三部分研究了重要中间体[Trans-3-甲基-4-羟基-2-丁烯基乙酰基(苄基，2，3-二氢吡喃基)醚]的合成新方法，找到了一条适合于工业化生产的制备反式-3-甲基-4-羟基-2-丁烯基苄基醚的新方法。第四部分研究了重要中间体[-3，7-二甲基-8-羟基-2，6-辛二烯-1-醇乙酸酯、-3，7-二甲基-8-溴-2，6-辛二烯-1-醇乙酸酯]的合成新方法，找到了一条适合于工业化生产的制备它们的新方法；同时研究了一条制备-3，7-二甲基-8-羟基-2，6-辛二烯-1-醇乙酸酯的另一新方法。

Xinjiang medicine's content of amino acid of fruit juice of mulberry fruit is concrete: 2,6-diaminocaproic acid 0.089, serine 0.044, histidine 0.025, glycine 0.049, ammonia 0.088, valine 0.057, 2-amino-5-guanidinovaleric acid 0.051, isoleucine 0.042, Radix Asparagi 0.068, 0.020, threonine 0.076, 0.022, 0.128, 0.069, third 0.048, benzene third 0.042 leucine glutaminic acid methionine hydroxyphenylaminopropionic acid.

新疆药桑椹果汁氨基酸含量具体为：赖氨酸0.089、丝氨酸0.044、组氨酸0.025、甘氨酸0.049、氨0.088、缬氨酸0.057、精氨酸0.051、异亮氨酸0.042、天门冬氨酸0.068、酪氨酸0.020、苏氨酸0.076、蛋氨酸0.022 、谷氨酸0.128、亮氨酸0.069、丙氨酸0.048、苯丙氨酸0.042。

This paperindicated that it was good for condensation reaction when benzene-ring bearingelectron-attaching groups. It also showed that and the 6-hydroxyl group could bereacted with acyl halide, haloid ether and halo alkene, but not with halo alkane. It wasnot only the first time to find that the reaction product of D-mannitol and aromaticaldehyde is tri-condensation derivatives, but also the first time to obtain thep-phthaldehyde-sorbitol derivatives containing eight hydroxyl groups.

研究发现：苯环上有吸电子基团时对缩合反应有利；多元醇缩醛衍生物6-羟基除与酰氯反应外，也能和卤代酸酯、溴代烯反应，但不与卤代烷反应；首次发现D-甘露醇与醛反应主要得到三缩合物；首次合成了含有8个羟基的对苯二甲醛和山梨醇的缩合物。

A suspension of carbon nanotubes as a nanofluids was prepared by dispersing carbon nanotubes into deionized water. The effects of several typical kinds of surfactants such as sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium bromide and emulsifying agent OP on the stability of the nanofluid were studied by stationary and centrifugal tests with sample morphologies characterized by SEM and TEM.

在水中加入碳纳米管制备了含碳纳米管悬浮液，研究了几种典型类型的表面活性剂：十二烷基苯磺酸钠、十六烷基三甲基溴化铵及乳化剂OP对纳米流体稳定性的影响，通过静置和离心分离等手段研究了其稳定性，并采用扫描电子显微镜和透射电子显微镜对样品的形貌进行了表征。

In this paper, using Liaoning\'s Ca-bentonite as matrices, modifying with sodium compound at first, organically modifying with Octadecyl/Hexadecyl ammonium chloride as the cover agent, based on hydrothermal process, and dispersing the modified bentonite into the dimethyl benzene-methyl alcohol system fully, we synthesized the high-grade organic bentonite gel with stable quality and excellent characteristics.

本文以辽宁钙基膨润土为原料，首先对其钠化提纯，然后以十八／十六烷基氯化铵为有机复合剂，采用水热合成技术对膨润土进行有机改性，将改性膨润土充分分散于二甲苯-甲醇体系中制备出产品质量稳定、性能国内领先的膨润土高档有机凝胶矿物材料。

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。