查询词典 quaternary

Quaternary ammonium salt was used as catalyst for transporting phenoxide ion between two phases to give benzyl phenyl ether and its derivatives in multiphase system.

在多相体系中，以铵盐为催化剂合成苄苯醚及其衍生物，产率高达91%，转化率达到98 3%。

The results show that the quaternary ammonium cations C12 TA(superscript + and C14 TA(superscript +) with short alkyl chain only react with the hydration cation in the interlamerllar space of hydrobiotite, while those with long chain C16 TA(superscript + and C18 TA(superscript +) first react with the hydration cation, then with the kalium cation in phlogopite interlayer.

结果表明：较短链长的季铵盐阳离子C12TA(上标+， C14TA只与水黑云母蛭石晶层中的水合阳离子发生反应；而长链季铵盐阳离子C16TA(上标+， C18TA先同蛭石晶层的水合阳离子交换反应，再与云母晶层中的钾离子发生交换反应。

Na-montmorillonite was modified with different quaternary phosphonium salts using ion-exchange method,and the structures and property of modified montmorillonite were studied.

采用离子交换法将不同的季鏻盐交换到钠基蒙脱土的层间得到改性蒙脱土，并对改性蒙脱土的结构和性能进行了研究。

The purpose of this paper is to synthesize some phosphonium salts with PPh3 and some chiral quaternary ammonium salts with L-Valine. And we also use L-Valine and L-Phe-OMe to synthesize a new type catalyst —2,5-diketopiperazine , the simplest compound of cyclo-peptide.

本文利用廉价易得的三苯基磷和手性L-缬氨酸作为起始原料，合成了几种普通季鏻盐和手性季铵盐，并且利用L-缬氨酸与L-苯丙氨酸甲酯反应，合成了一种新型的相转移催化剂——2，5-二酮哌嗪环类的化合物。

The results indicated that the area of SOC increase after 20 years was 621.3 km2 and the increase was 0~5 g/kg and 5~10 g/kg, but that of decrease was 38.4 km2 .The areas of SOC changes in soils derived from phyllite, granite, red sandstone, Quaternary red clay and purple shale were 361.7 km2, 144.7 km2, 76.5 km2, 48.7 km2 and 27.8 km2, respectively. The areas of SOC changes in soils with elevations below 300 m, 300~500m, 500~800m and above 800 m were 358.9 km2, 200.2 km2, 62.9 km2 and 28.0 km2, respectively.

结果表明， 20 a来，兴国县农田土壤中土壤有机碳增加的面积为621.3 km2，减少的面积为38.4 km2，增幅主要在0~5 g/kg和5~10 g/kg；千枚岩、花岗岩、红砂岩、第四纪红粘土和紫色砂页岩发育的土壤中有机碳变化量分布的面积分别为361.7 km2、 144.7 km2、 76.5 km2、 48.7 km2和18.0 km2，海拔在300 m以下、 300~500 m、 500~800 m和800 m以上的土壤中有机碳变化量分布的面积分别为358.9 km2、 200.2 km2、 62.9 km2、 28.0 km2。

The Quaternary and Pliocene layers are suitable for stable exitence of gas hydrate.

适合水合物稳定赋存的地层主要是第四纪（1.8km/s、2.2km/s）和上新世的地层（2.8km/s）。

In Asia, from the Quaternary to the present diversity of a large porcupine, is also very rich in fossils.

在亚洲，从第四纪到现在豪猪的分异很大，化石也很丰富。

After that the fractures in the right dam foundation slope were stretched at the beginning of the Quaternary Period because in the period Yakouhoushan mountain quaquaversal dome was blowups quickly. At the same time, the valley trenching of Lancang River reach to 800-1000 meter in altitude at the right bank in Nuozadu dam site. This two reason accelerated the groundwater infiltration in the right bank slope. So, the weathering agency could have invaded deeply in the right bank slope.

导致右岸岩体复杂化的成因是，右岸岩体在早期遭受了多期构造作用和岩体蚀变的基础上，第四纪早期丫口后山穹隆的快速隆起与当时河谷下切至800m～1000m高程这一特殊因素组合引起了右岸岩体沿原有的断裂张开，使地下水等风化营力能够到达坡体较深部位，经过长期的风化卸荷作用，形成了右岸复杂岩体。

Therefore, the deep study of quaternary environment of this area is of great importance in science and realism.

因此，对这一地区的第四纪环境进行深入的研究，不仅具有较高的科学价值，还具有深远的现实意义。

Quaternary sector of the economy : Involves the research and development needed to produce products from natural resources.

第四纪的经济部门：涉及的研究和发展生产所需的自然资源。

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。