查询词典 quaternary

The results also show that this is suitable method to collect quaternary ammonium compounds from seaweeds.

分析结果表明，海藻中季铵化合物的含量很丰富；绿藻特别是浒苔中的季铵化合物含量最高可达到1.31 %。

The main target coal seam of Xieqiao Mine is directly covered with the Quaternary bottom gravels, whose impermeability affects the reasonable retainment of waterproof pillar .

第四纪底砾层直接覆盖在谢桥煤矿煤系地层之上，其隔水性能影响到防水煤柱的合理留设。

From Yungui Plateau, Dabie Mountains and Funiu Mountains, and West Tianmu Mountain in China to determine the Genetic structure of Ginkgo populations, and to infer the glacial refugia of Ginkgo survived Quaternary ice ages.

种群进行了系统地理学研究，分析了银杏的遗传多样性格局，并探讨了银杏冰期避难所在和冰期后的扩散情况。

Although many researchers have studied the synthesis of allyl phenyl ether by phase-transfer catalysis, no studies have used it in membrane reactor up to now. The purpose of this paper is to combine the studies of membrane reactor and phase-transfer catalysis. The membrane was used to stabilize the aqueous/organic interface at a fixed position, also the quaternary ammonium ion in the membrane was used as the catalyst to partake in the reaction system directly, and so it can also separate the product and reactants at the same time. A theoretical model is also presented.

中文摘要对於利用相间转移触媒催化技术来合成丙烯基苯基醚的反应，已有不少专家学者研究过，而至今还无在薄膜反应器中进行此反应之研究，本研究则是要结合薄膜反应器与相间转移触媒两者之特性，固定水油两相之界面，并且利用薄膜上的四级铵离子为触媒，直接在反应系统中参与反应，并同时分离产物及反应物，进而推导出相关之理论模型。

The Yao' an station was installed on the Quaternary allurium in the Yao' an basin and has a site amplification factor of 3 to 4 for S-waves and that of 6 to 7 for coda relative to the rock reference station Pila in the frequency range of 3 to 6 Hz.

姚安台位于姚安盆地第四系冲积层上，对应苤拉基岩台，在3~6Hz低频段S波有3~4倍的放大因子，尾波有6~7倍的放大因子。

In background of drying palaeoclimate in Quaternary, a short-term development of freshwater biota such as ostracods and charophytes is resulted from the effects of local tectonic movement on the sedimentary environment.

在第四纪逐步干旱的古气候背景下，介形虫和轮藻等淡水生物群的阶段性发育是局部构造运动影响沉积环境的结果。

Huge thickness of lake facies deposit of Quaternary is developed in eastern Qaidam basin, in which the abundant microfossils such as ostracods, charophytes and gastropods are important evidences for analysis of stratigraphy and sedimentary environment.

柴达木盆地东部发育了巨厚的第四系湖相沉积，介形类、轮藻和腹足类等微体化石发育，是地层和沉积环境演化分析的重要依据。

ACQ-DB is a water-based wood preservative that contains copper and Quaternary Ammonium Salts and boron-containing compounds.

ACQ-DB 是一种水溶性木材防腐剂，其主要活性成分包含铜、季铵盐、硼化合物。

The improved method selects the absorbing wavelength of 618 nm and the reaction time of 40 min, uses the NH4Cl-NH3 buffer solution (pH=8.0) and BTB alcohol solution (0.4 g/L) respectively of 5 ml and 1.5 ml in the 50 ml volumetric flask, and can test the concentration of imidazolinyl-quaternary-ammonium-salts in range of 0 mg/L to 80 mg/L.

利用改进的显色反应法检测时，吸收波长选择618 nm，显色时间40 min， 5 ml容量瓶中NH4Cl-NH：缓冲液(pH=8.0)和BTB乙醇溶液(0.4 g/L)的添加量分别为 5 ml、15 ml，适用检测的咪唑啉季铵盐浓度为0~80 mg/L。

Aluminum gallium indium nitride quaternary epilayers were prepared by metalorganic chemical vapor deposition on c -plane sapphire （α-Al2O3） substrates.

利用金属有机物化学气相沉积方法在 c 面蓝宝石（α-Al2O3）衬底上外延生长了铝镓铟氮四元合金薄膜。

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。