化学元素

ABSTRACT The content of constituents in YongAn middlings and Zhongliang shan middlings has been calculated in light of the results of ultimate analysis and X-ray diffraction, and the structure of middlings has been studied by means of polarizing microscope.

本文以高灰低硫的永安中煤（Ad=51.11%，St=0.35%）和低灰高硫的中梁山中煤（Ad=32.29%，St=3.02%）为研究对象，首先利用中煤灰成分化学元素分析和X射线粉末晶体衍射的矿物成分分析结果，通过计算求出了中煤中各组成成分的含量，并借助偏光显微镜对中煤矿物质的赋存状态进行了研究。

The element of Ca has the strongest migrational ability, and Mg, Sr, Zn, K, Na, etc. have relatively strong migrational abilities.

富集系数、富集分异系数等指标的分析表明，化学元素存在不同程度的富集、迁移。

The actual chemical make-up of rocks is complex, so the conventions of petrological analysis pretend that these metals are present in basalt as their oxides.

然而构成这种岩石的化学元素十分的复杂，因此根据常规的岩石分析得出出现在玄武岩里的金属都是其氧化产物。

New government research shows that tomatoes should not be considered our only major source of lycopene, the phytochemical that could help prevent certain cancers and other health problems.

新的政府调查表明西红柿可能不是能够提供番茄红素（一种能够帮助抵御癌症以及其他生理疾病的植物化学元素）的唯一来源。

Previous studies indicate two possibilities of the formation of the greigite: 1 the seepage of seawater during the postglacial transgression provides sulfate and makes the reducing diagenetic conditions; 2 it may be precipitated as the authengenic mineral in marine or lacustrine sediments during the low sea-level stand of the Late Pleistocene.

本研究在前期工作基础上，针对已发现的硫复铁矿富集区选择典型柱状样6根(深约1.5-2.5m，长柱样；B436、B437、B439、B459、B483、B484)，同时于扬子浅滩前缘新获取柱状样4根(深约0.3-0.5m，短柱样；ST9、ST13、ST15、ST23)，进行了U系测年，粒度分析、磁性测量、X—射线衍射分析、微体古生物鉴定分析、粘土矿物和化学元素含量测试，试图揭示东海外陆架浅部地层结构、揭露硫复铁矿在地层中的分布规律及成因机制，从而探讨该区晚更新世以来海平面波动模式及其控制下的地层发育。

Based on the analysis results of surficial sediment elements from 134 stations east of the Ryukyu Islands and other mineralogical data,the geochemical characteristics of surficial sediment elements from the study area were analyzed.

对琉球群岛以东海域134个站位表层沉积物的化学元素含量进行了系统测试，结合矿物学资料等，对研究区的表层沉积物元素地球化学特征进行了分析。

The results show a remarkable change in the chemical properties of rainfall after passing through the forest canopies. There is an observed decrease in pH and DO, obvious increase in TURB and TDS, and different degrees of increase in other chemical elements.

结果表明：大气降水经过林冠层后，其水化学特征发生了明显变化，pH和DO降低，TURB和TDS明显增加，化学元素含量均不同程度增加。

Irritants are usually chemical elements that may be present in the environment or may be unsuspectingly used by the individual.

刺激物通常是化学元素可能存在于环境中或可信任所使用的个人。

Chemical elements (for example, silicon and selenium )doped for use in electronics are to be classified in this Chapter,provided that they are in forms unworked as drawn, or in the form of cylinders or rods.

八、经掺杂用于电子工业的化学元素，如果拉制后未经加工或呈圆筒形、棒形，应归入本章；如果已切成圆片、薄片或类似形状，则归入品目38.18。

Chemical elements and their compounds, excluding the hydrocarbons and their derivatives (except carbides, carbonates, cyanides, cyanates and carbon disulfide).

不含除碳化物，碳酸盐，氰化物，氰酸盐及二硫化碳外的烃基及烃基衍生物的化学元素及其化合物。

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。