查询词典 carbonate

In this dissertation, two series of rare earth initiators: rare earth tri (2, 6-di-tert-butyl4-methylphenolate) and rare earth calixarene complex have been developed to ring-opening polymerize 2, 2-dimethyltrimethylene carbonate, trimethylene carbonate and ε-caprolactone at mild conditions. Both the polymerization features and mechanisms are discussed in details.

本论文为环碳酸酯、内酯的开环聚合开发了两类新型低毒性稀土催化剂：三(2，6-二叔丁基-4-甲基苯氧基)稀土配合物和对叔丁基杯芳烃稀土配合物，都可以在温和的反应条件下单组分引发2，2-二甲基三亚甲基环碳酸酯、三亚甲基环碳酸酯和ε-己内酯聚合，合成各种分子量的均聚和共聚材料，考察了催化剂结构、聚合条件等对聚合的影响，深入研究了聚合机理。

Sequential leaching experiments indicate fluorine in carbonate rock, phosphorite and Mo-Ni ore layer occurs principally in dissolvable forms: water-soluble, associated with carbonate or phosphorite, so fluorine in which rocks have high chemical mobility at surface conditions. Fluorine in siliceous rock, black shale and carbonaceous slate mainly occurs in undissolvable forms, which are inert at surface conditions.

氟在碳酸盐岩、磷块岩、钼、镍等多元素富集层及部分硅质岩中主要以水溶态、碳酸盐结合态等易溶形式存在，其在自然条件下的化学活动性强；而氟在碳质板岩、黑色页岩及大部分硅质岩中主要存在于难溶矿物中，其化学活动性较弱。

The invention relates to a preparation method of vinylene carbonate, which comprises halogenated ethylene carbonate and dehydrohalogenation agent which are subject to contact reaction. The dehydrohalogenation agent is ammonia with a purity of not less than 99.9 percent.

一种碳酸亚乙烯酯的制备方法，该方法包括将一卤代碳酸乙烯酯与脱卤化氢剂进行接触反应，其中，所述脱卤化氢剂为纯度不低于99.9％的氨气。

Compared with LREEs, HREEs would preferentially be eluviated during weathering of tailing; the HREEs would preferentially be complexed with carbonate ions and coprecipited with carbonate minerals.

矿渣堆的风化作用中HREE优先淋滤出来，优先与碳酸盐离子络合，又优先与碳酸钙质同沉淀。

The results show that 42.86% topsoil samples are polluted by Cadmium, soil synthesis pollution index is moderate, Cadmium pollution degree of topsoil correlate with the environment of sampling sites. The results also show that exchangeable Cd, carbonate-bound Cd, organic-bound Cd and residual Cd are found in all soil samples except for Fe-Mn oxide-bound Cd. Furthermore, the concentration of exchangeable Cd and carbonate-bound Cd, both which have high biological validity, is high. Humus has a certain correlation with exchangeable Cd, organic-bound Cd and residual Cd, and has no obvious correlation with other chemical speciations. Any chemical speciation of Cd has no obvious correlation with pH and total Fe of soil samples. Cadmium in topsoil can be eluviated by acid solution, the quantity of Cadmium eluviated by redistilled water is little. With the rise of pH of eluviating solution, eluviated Cadmium quantity decrease. For the same soil sample, the lower pH value of eluviating solution is, the more fast the Cadmium is eluviated, and the more thequantity of Cadmium is eluviated.

研究结果表明：成都市表生土壤样中有42.86%受镉污染，镉综合污染水平达中度污染，成都市表生土壤镉污染程度与采样点周围环境表现出一定的相关性；除铁锰氧化物结合态镉在部分土壤样中未检出外，所有土壤样均含有可交换态镉、碳酸盐结合态镉、有机结合态镉、残留态镉，且生物有效性较高的可交换态镉和碳酸盐结合态镉占总镉量比例较高；成都市表生土壤中的腐殖质与可交换态镉、有机结合态镉、残留态镉有一定相关性，与碳酸盐结合态镉、铁锰氧化物结合态镉相关性不显著；各形态镉与土壤pH值和全铁的相关性均不显著；土壤中的镉可被酸溶液淋出，重蒸馏水淋出镉量十分微小；随着淋滤液pH值的升高，土壤样的镉淋出量下降，且0～5小时时段的镉淋出量占镉总淋出量比例下降，5～30小时时段的镉淋出量占镉总淋出量的比例上升，对同一土壤样而言，酸度大的淋滤液比酸度小的淋滤液淋出镉速度更快，淋出镉量更大。

Lithium perfluoroalkylphosphonate was synthesized by LiF and perfluoroalkylphosphonate acid obtained by electrochemically fluorinating chlorodiisopropylphosphine. Some properties of a kind of electrolyte that was made from dissolving the lithium perfluoroalkylphosphonate in the mixed solvent with ethylene carbonate and dimethyl carbonate mass ratio 1∶1 were investigated, such as conductivity, stability toward hydrolysis and oxidative decomposition potential, and so on.

选取氯代二异丙基膦(C6H14PCl)为原料，利用电化学氟化方法，得到全氟烷基膦酸[(C3F7)2PF3]，(C3F7)2PF3与氟化锂反应得到全氟烷基膦酸锂Li[(C3F72PF4]，将其溶于碳酸乙烯酯和碳酸二甲酯质量比为1∶1的混合溶剂中得到电解液，考察电解液的电导率、抗水性及氧化分解电位。

Carbonate content is a mature and effective index for paleo-oceanography, but carbonate contents are commonly low in Arctic and so the study value is rebated largely.

在古海洋学研究中常用碳酸盐含量作为古海洋学研究的指标，但是北冰洋西部地区由于特殊的自然环境条件，使得沉积物中的碳酸盐含量特别低，以至于碳酸盐指标的应用价值受到了一定的影响。

The back extraction of Am 3+,Pu,UO 2+ 2 and TcO - 4 with high concentration nitric acid, oxalic acid, sodium carbonate, ammonium carbonate respectively from different 30% TRPO/kerosene systems are studied.

研究了硝酸、草酸、碳酸钠和碳酸铵对 4种不同来源的TRPO/煤油中Am3 +，Pu ，UO2 2 +和TcO-4的反萃，观察了碳酸钠溶液反萃铀时的乳化现象，比较了上述 4种TRPO的红外光谱、裂解色谱。

Content of the project: utilize CO2 resource, to set up production lines of methyl carbonate, granular dry ice powder, salicylic acid, sodium carbonate and ethylene urea etc.

项目介绍：项目内容：利用二氧化碳资源，新建碳酸二甲酯、颗粒干冰粉、水杨酸、轻质氧化鲜、碳酸钠、乙撑脲生产线。

Content of the project: utilize CO2 resource, to set up production lines of methyl carbonate, granular dry ice powder, salicylic acid, sodium carbonate and ethylene urea etc.

项目内容：利用二氧化碳资源，新建碳酸二甲酯、颗粒干冰粉、水杨酸、轻质氧化鲜、碳酸钠、乙撑脲生产线。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。