查询词典 glacial

Bromo-2′,4′-dichloroacetophenone was synthesized in three steps,w hich were bromization ,chlorination and acylation,from glacial acetic acid and m -dichlorobenzene.

以冰乙酸和间二氯苯为原料，经溴化、氯化、酰化三个步骤，制得 2—溴- 2′，4′-二氯苯乙酮，产率达 70 %。

Pyruvaldehyde was synthesized with acetone or 1,2 propanediol as starting material respectively.With n∶n=1 00∶0 79,3 0-4 0 g potassium chlorate as catalyst,and water and glacial acetic acid as solvent,refluxing on water bath of 60-75 ℃ for 4 h,bromoacetone was obtained in 63 5% yield.

分别用丙酮和 1，2 丙二醇做原料合成了丙酮醛。n∶n =1 0 0∶0 79，加入 3 0～4 0g氯酸钾做催化剂，水和冰醋酸做溶剂，水浴温度为 6 0～ 75℃，回流 4h ，制得产率为 6 3 5 %的溴丙酮。V∶V =11 9∶1 0 ，通入空气，在 6 5～ 70℃反应 5～ 8h ，制得产率为 5 9 6 %的丙酮醛。

In Antarctica, these losses are in the form of icebergs calved from ice shelves formed by glacial movements on the mainland.

南极洲的这些海冰是以冰山碎裂的形式消失的。这些冰山是大陆上的冰川运动形成的。

The accumulation rates of terrigenous long-chain compounds peaked at H3, paralleling those of the algae biomarkers, demonstrate that the enhancement of Eustigmatophceae and coccolithophorid productivity at H3 is caused by an increased terrigenous nutrient supply from the Sunda Shelf. This interpretation coincides with Sunda Shelf laid bare, the low sea level and river flood due to the abundant monsoon precipitation in southern South China Sea in the last glacial.

同时这些化合物的堆积速率在H3都出现了极大值，与水生生物来源的生物标志物的变化一致，反映出在南海海平面降低，巽它陆架出露背景下这一时期丰富的季风降雨导致河流洪水泛滥，从而引起南沙海区输入的陆源营养元素增多，黄绿藻、颗石藻海洋表层生产力的增高。

Cosmogenic isotopes 〓Be was used to date the glacial geomorphic surface of Qinghai-Xizang Plateau in this paper.

本文应用宇生核素〓Be对青藏高原冰川地貌面的年代进行计算。

A new technology process of sodium diacetate production with glacial acetic acid and sodium carbonate in one reactor.

研究了以冰醋酸和碳酸钠一步合成双乙酸钠的工艺和反应设备，使双乙酸钠生产工艺更为简单合理，经济易行，而且产率达 97%以

This is not surprising, given the closer proximity of Pengyang to the Asian inland dust sources; The average content of calcium carbonateis of Pengyang section is not only higher than that of central loess plateau, but also higher the west of Chinese Loess Plateau, which reflected Pengyang loess had been deposited by near Liupanshan\'s substances that contained more calcium carbonateis; The content of diffluent element of 10m depth in the section increased fast, which indicated that the modern eluviation and the leaching depth of loess may be stronger than our guess; The soil growth index can reflect the intensity of soil forming and the climatic changes; The "abrupt chang" of glacial and interglacial period was caused by strong soil-forming processes that enlarged the discrepancy of granularity between loess and paleosol. However, the magnetic susceptibility nearly cannot reflect the existence of S_8 and the magnetic susceptibility of S_7 is highest in the whole section, which is inconsistent with other studies that S_5 has the highest magnetic susceptibility.Thin-section examination shows that the micro-texture of the soil layers is divided into both cementing texture in S_7, S_5 and S_1, and granular texture in all others.

与其它剖面相比，彭阳剖面粒度总体上要比东部的洛川、西安，甚至西部的兰州、新疆东湾要粗；CaCO_3平均含量不仅高于黄土高原中部，也高于高原西部，反映出本剖面富含碳酸盐的六盘山近源沉积起到了很重要的作用；易溶元素含量在剖面10m处快速升高，淀积特征明显，反映出黄土受现代淋溶成土作用影响较大，黄土直立、疏松、多孔特性和高温与多雨组合的气候特点，使得元素淋溶、淀积的强度和深度超出了传统的认识和判断；烧失量与其它指标相比，不仅能区分冰期、间冰期；而且能够区分出次一级的冰阶、间冰阶，有较高的分辨率；土壤发育指数、红度能够反映土壤强度差异，是反映气候波动的较好指标；然而，磁化率不能反映古土壤S_8的存在，且S_7的磁化率在全剖面中最高，这与大多剖面S_5磁化率最高的特点不一致。4。

As the latest abrupt climate event with temperature decrease from the transition of the last glacial period to the Holocene, the Younger Dryas event that occurred approximately between 12.9 to 11.6 ka BP at north Atlantic is very important on the study of abrupt climate change, while there are still many debates on its trigger site, trigger time, trigger mechanism, as well as whether it is a global event.

大约发生在12.9～11.6 ka BP的新仙女木事件在气候突变的研究中占有重要地位，然而对其触发时间、触发地点、触发机制以及YD事件是否是一个全球性的事件一直存在很大争议，并且该事件触发机制的研究对目前全球温度快速升高背景下未来气候变化的预测也有很大的意义。

; 3 younger Dryas Only has reflection in the hundred-year-scales climatic curve, it is not evident in the curve of long period; 4 in the hundred-year-scales climatic curve, the last glacial maximum fluctuation as frequuently and 18-28KaBP was the stage in which the frequency fluctuation was the largest.

；（3）新仙女木事件仅反映在百年尺度的气候曲线上，在较长周期的饿曲线上不明显；（4）在百年尺度的气候曲线中，末次冰盛期气候波动频繁，其中18-28KaBP 是频率波动的最大阶段，但随着周期尺度的加大，气候的波动频率逐渐趋于均匀。

10Be records in the Okinawa Trough sediment during the last glacial, the Younger Dryas cold period, and the Holocene show that the main part of the fluctuations in 10Be content in the sediment can be attributed to variations in the 1°Be production rate.

表层沉积物中的10Be，9Be和Pb三者表现出完全不同的分布特征。10Be的分布主要受黑潮及其支流黄海暖流所支配；10Be的分布受黄河陆源物质输入的影响，主要集中在南黄海泥质区；Pb则主要分布在长江口和琉球群岛附近，反映了人类活动的影响。

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。