查询词典 determine the chemical composition of a substance

Danba ; Sichuan ; platinoid mineral ; chemical composition ; ore ; deposit

四川丹巴； Pt族元素矿物；化学成分；矿石；矿床

The temperature effect on the oil yield was discussed at first. Then, analytical work was carried out as follows: the ultimate analysis and physi-chemical analysis of the pyrolytic oil comprised a sketch of the fuel properties of the oil; Then, through the distillation analysis of the oil, the fraction composition of the "unrefined"oil was known. After that, a general knowledge of the aromaticity and saturation of the hydrocarbons in the oil was provided by the outcome of the FT-IR functional group analysis. Also, from the analysis, the form of the polar functional groups and their distribution in different fractions of the oil were learned.

文中首先对不同热解温度下热解油产率进行分析讨论，然后，针对热解油品质进行了一系列分析：通过元素组成和理化特性的分析，对热解油作为燃料特性有了一个大致了解；通过实沸点蒸馏分析，得到热解油作为一种未提炼油的馏分分布，并为后续热解油馏分的细入分析提供了前提；通过对热解全油和各窄馏分的FT-IR官能团分析，对热解油的芳香性、不饱和性有了整体的了解，并且清楚了热解油中的极性官能团存在型式及其在热解油不同馏分中的分布。

Preparation method and chemical composition of water-solubility polysaccharide in corn silk were studied in this paper.

对玉米须中水溶性多糖的制备方法和化学组成进行了研究。

In present work, pyrolysis behavior of several preceramic polymers was studied, and various physical and chemical changes which took place while the preceramic polymer-filler systems were being reaction pyrolyzed were investigated, then phase composition, microstructure and properties of the multiphase ceramics were characterized

本论文在单独研究了几种聚合物先驱体的热解行为的基础上，对多个聚合物先驱体+充填剂体系的反应热解过程中的各种物理、化学变化作了深入探讨，继而研究了由此制备的复相陶瓷的相组成、显微结构和性能的形成和变化规律。

Through long-term monitoring of the change of the chemical composition of groundwater,a new kind of premonitory information for earthquake prediction may be provided.

通过长期监测地下水中水化学成分的变化，就有可能为预测预报地震提供一种新的前兆信息。

Chemical Composition More than 180 compounds have been identified in propolis, and many are biologically active.

蜂胶中含有超过180种化学成分，大多数是具有生物活性的成分。

An anti-sloughing drilling fluid system－PRT is developed, based on the analysis of clay mineral composition, structure, physical and chemical characteristics.

分析了该地区易塌层段的粘土矿物组分、结构特性和物理化学特性以及存在的钻井液技术难题，研究出PRT防塌钻井液体系。

A systematic study on the characteristics in distribution, chemical composition, crystal texture, crystal morphology and pyroelectricity of pyrite has been made in the Wulong gold deposit .

文章论述了五龙金矿床黄铁矿的分布特征、化学成分特征、晶体结构特征、晶体形态特征及热电性特征，为矿床的成因研究及深部远景评价提供矿物学依据。

Chemical composition of the pyroxmangite depends largely on Mn and Fe, which cause remarkable variation of its color.

化学成分除Si外主要为Mn和Fe，矿物化学式：Ca(下标 0.27~0.43Mg(下标 0.43~0.57)(下标0.75~1.00) Mn(下标 4.94~5.77Fe(下标 0.36~1.36)(下标 6.16~6.37)[Si(下标 6.86~7)O(下标 21)]。

In addition, Chinese herbs, such as Viola yedoensis, Andrographis, and so on, with strong grass Ranunculus the chemical composition of these components can play a role in the fight against AIDS.

另外，中草药如紫花地丁、穿心莲、猫爪草等均含有强有力的化学成分，这些成分可以起到一定防治艾滋病的作用。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。