查询词典 quaternary

This paper reviews the mechanism of the phase transfer catalytic reaction according to the different compositions of catalytists, including quaternary ammonium salts,polyethylene glycols and grown ethers as well as application of the PTC in Organic synthesis , such as the reaction of,nucleophilic substitution,addition,condensation,oxidation-reduction and so on.

综述了在不同催化剂结构下所遵循的相转移催化反应机理，包括季铵盐类、聚乙二醇类及冠醚类催化机理，以及相转移催化在有机合成中的应用，如亲核取代反应、加成反应、缩合反应、氧化还原反应

Pliocene-Quaternary faulting in grabens around the Ordos block displays predominantly normaldip slip displacements with a right-lateral or left-lateral slip component,indicating a NW-trending extension.

鄂尔多斯周缘地堑系上新世～第四纪的断裂作用表征为以正向倾滑活动为主，同时具有右旋或左旋走滑分量的运动型式，指示了NW-SE向地壳引张作用。

In the previous work,a conformational rule was proposed for Hofmann elimination of quaternary ammonium hydroxides.

本文合成了12种含环戊基或环己基的第四级铵碱，使之发生Hofmann消除反应。

A new polyelectrolyte complex was synthesized from quaternary salt of poly(N,N-dimethyamino ethyl methacrylate) and metanil yellow in water.

运用聚甲基丙烯酸二甲胺基乙酯的季胺盐在水溶液中与酸性金黄进行了组装，并制得相应的组装产物。

It has been found that the Sanweishan fault is a Quaternary active fault which had intensely moved in the way of thrusting during the early to mid-Pleistocene and has ceased its movement since the late Pleistocene. Field investigation shows tha...

研究结果表明，敦煌三危山断层是一条晚更新世以来无强震的第四纪活动断层，早、中更新世曾发生过比较强烈的倾滑逆冲运动，晚更新世以来停止活动，代之以包括三危山断层在内的间歇性区域抬升运动。

Refer to the research findings of CHengDu Research Institute of Geosciences and Minerals(1990) and Nanjing Research Institute of Geography and Lake of Chinese Academy of Sciences(1989), according to the Guidebook of China Stratum(2000), the chronostratigraphy of Kunming Basin is divided into 4 age: the bottom of the Quaternary corresponding to M/G Boundary, age is 2.6Ma;the Bottom of the Mid-Pleistocene corresponding to B/M Boundary, age is 0.78Ma;the Bottom of the Upper-Pleistocene corresponding to the Blake event, age is 0.128Ma;the Bottom of the Holocene corresponding to the Gothenburg event,age is 0.012Ma.

本次研究获得了大量的测年数据，参考成都地质矿产研究所(1990)及中科院南京地理与湖泊研究所(1989)等的研究成果，按照中国地层指南(2000)的方案，厘定了昆明盆地第四纪年代地层划分：第四系底界对应古地磁松山反向期与高斯正向期界线处，年龄为2.6Ma；更新统中部底界对应古地磁布容正向期与松山反向期界线，年龄为0.78Ma；更新统上部底界对应古地磁布莱克事件附近，年龄约0.128Ma：全新统底界对应古地磁哥德堡事件附近，年龄约0.012ma。

The two types of animals: mammoths and smilodons vanished from the earth stood for the end of Quaternary Period.

猛犸象和剑齿虎从地球上的消失标志了第四纪冰川的结束。

The paper introduced serious sand production actuality of the quaternary gas reservoir located in Sebei Gas Field,which consists of unconsolidated fine siltstone formations with high content of shale.

介绍了涩北气田第四系高泥质疏松粉细砂岩气藏的出砂现状，通过多年的室内基础理论研究和现场防砂先导性试验成果总结，形成了适合涩北气田的高压一次充填防砂工艺。

After complete regional analogue, it is discovered that the palaeoclimate and palaeoenvironment in Tontso is entirely comparative and consistent with the synchronous lakewater retreating of Zhaduixiong spits in Zabuye Lake basin, with palaeoclimate changes recorded by pollen in adjacent Zhabuye Lake, with Holocene palaeoclimate environment indicated by drilling-hole in Bangong Co, with palaeoclimate significance traced by δ〓O value in Qinghai Lake and Siling Co, with pollen- and diatom-inferred climatic change in Longmu Co and Sumxi Co, and with the palaeoclimate framework during the 5〓 Level Arid Extension Period of Quaternary arid center of Western China.

对比研究发现，洞错的古气候环境，与同期相邻的扎布耶湖湖水退缩遗迹和花粉记录的古气候变化、班戈湖钻孔所揭示的全新世古气候环境、色林错δ〓O值所揭示的气候意义、龙木—松西错的孢粉和硅藻提供的古气候古环境信息以及第四纪西部干旱中心在第5级干旱扩张期中的古气候格局，它们的气候环境变化总体上均有可对比性和一致性。

Only very few of the quaternary metal selenides KxMyMy(Sez M(=Zn,Cd,Hg have been reported except K2Hg3Sn2Se, K2Hg3Ge2Se8, K6ZnSn5Se17 ect.

据文献报道，已经合成的KxMyMy(Sez M(=Zn，Cd，Hg体系的化合物很少，例如：K2Hg3Sn2Se8，K2Hg3Ge2Se8，K6ZnSn5Se17等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。