查询词典 quaternary

The natural thermoluminescence in Quaternary sediment has stored accumulated irradiated dose since the sediment deposited.

第四纪沉积物的天然热释光中储存有自沉积以来的累积辐射剂量。

He Youngest Toba Tuff eruption was the greatest single volcanic event which occuned in the Quaternary, dated back to 74 ± 2 ka., and bad important impacts on global environmental and climatic changes.

oba火山活动是第四纪最大的火山事件，其中最年轻的约0.074Ma的火山活动被称为YTT事件。

Transuranic waste; uranium; radioactivity; nuclear waste; geology; rocks; hydrogeology; Quaternary; stratigraphy; ground water; hydrochemistry; UK; Cumbria

关键词：超铀元素废弃物；铀；放射能；原子能工业废料；地质；岩石；水文地质；第四纪；地层学；地下水；水质化学；英国；坎布里亚郡

In this paper uranyl sulphate species adsorbed on quaternary ammonium resin are studied with infrared spectrometry.

本文用红外光谱研究了季铵树脂吸附的硫酸铀酰络合物。

It is distributed only in Yuanbaoshan mountain in northern Guangxi. Abies yuanbaoshanensis having survived the Quaternary Period Ice-age is significant not only to studying the occurrence and evolution of the Chinese ancient south plant flora but also to the ancient climate and geography.

元宝山冷杉是第四纪冰期幸存下来的濒危物种，在广西的发现，对于研究我国南方古代植物区系的发生和演变，以及古气候、古地理有重要意义，特别是对第四纪冰期气候的探讨有学术价值，它是研究气候变化和植物变迁的依据，是活化石。

The synthetic application of the multi-stereocenter β-bromo aldehyde 7a with quaternary carbon was demonstrated in the total synthesis of Amaryllidaceae alkaloid Lycoramine.

四、含有季碳的多立体中心β-溴代醛7a在天然石蒜科生物碱-Lycor--amine全合成中的应用研究。

The difference of ammonia, amido, amino group and quaternary ammonium salt, some common wrong expressions on them, and the valence state of phosphorus in some of its oxyacid were pointed out.

指出了氨、氨基、胺基及季铵盐的区别及其常见错误表述，以及磷的几种含氧酸中磷的价态，并着重指出没有&次亚磷酸&的叫法。

Five preservatives,based on different formulas of Ammoniacal copper quaternary,were selected to treat bamboo to evaluate their performance of decay and leaching resistance.

比较了5种ACQ防腐剂处理竹材的防腐性能和抗流失性。

The invention relates to a preparation and purification method of bicaudal gemellus quaternary ammonium salt type cationic surfactant.

本发明涉及一种双尾双子季铵盐型阳离子表面活性剂的制备及纯化方法。

Then VIII reacted with hydrochloric acid and bromoethlane respectively to get tertiary ammonium chloride and quaternary ammonium bromide cationic surfactants, and the properties of cations were detected by the method of bromophenol blue.

然后再与盐酸和溴乙烷反应，合成铵盐和季铵盐型含氟阳离子表面活性剂，利用酸、碱性溴酚兰实验和铁氰化钾法分别对表面活性剂进行了定性和定量分析。

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。