构成的化学元素
Elemental composition can vary within the same copper-ore lode, usually because of varying admixtures of other elements, especially iron, lead, zinc, and arsenic.
即使在同一铜矿矿脉中，元素构成也会发生差异，这一般是因为其它元素，尤其是 铁、铅、锡、和砷等程度不同的混合。
Elemental composition and BET surface area of pyrolysis carbon were investigated. X-ray diffraction pattern and constant-current charge-discharge properties of pyrolysis carbon were stu***d.
元素分析、氮气物理吸附和X射线衍射分别考察了裂解炭的元素组成、BET比表面积以及微晶结构变化；
The mass concentration, water-soluble ions and elemental composition of fine particles were detected by the weighing method, ion chromatography, inductively coupled plasma chromatography separately.
用称重法、离子色谱法和电感耦合等离子质谱法分别测得细颗粒物的质量浓度、水溶性离子和元素组成。
But when it comes to our elemental composition, we're not a carbon copy.
然而，要说到地球上的另外一个主要组成元素——碳，则全部来自地球，非常纯正。
It has been found that the new elemental composition in extrusion moulding is epoxy and paraffin. and the precision zirconia ceramic ferrules have been obtained.
获得了环氧树脂和石蜡两种新的二氧化锆成型配方。
The relative atomic percent contents (A. C. %) of the golden film calculated at the constant elemental composition section on the AES profile curves were O 56.9%;
从AES深度分布曲线的组成恒定区求得各组成元素的相对原子百分浓度（A.C。%）为：O 56.9%；
Elemental composition analysis, proximate fuel analysis and fuel composition analysis of sawdust briquette fuel were done in the experiment.
试验分别对木屑致密成型燃料进行了元素分析、工业分析和燃料组成分析。
The caustic extract of Jinan FCC LCO was found to comprise over 70 phenols by elemental composition, IR and GC/MS analyses.
采用元素组成、IR和GC/MS等方法对济南炼油厂的催化裂化柴油碱洗出物进行分析 ，鉴定出70多个酚类化合物。
Surface elemental composition was analyzed qualitatively by X-ray photoelectron spectroscopy (XPS). Surface heparin content was detected by toluidine blue O(TBO).
采用水接触角、X射线光电子能谱（XPS）、*********蓝法（TBO）对所修饰的材料进行了表征。
A sample of a single compound may be analyzed to establish its elemental composition or molecular structure;
单一化合物的样品，可藉由化学分析以明了其元素组成或分子结构；
Firstly, they were identified by authors as ultra microfossils instead of ultra microbes based on their morphology, structure and elemental composition.
首先，它们是笔者根据形态、结构和元素成分作为超微生物化石进行鉴定的。
The PET fibers are treated by cold plasma technology and the elemental composition and the type of functional groups of the surface of PET was analyzed by ESCA.
采用冷等离子体技术处理涤纶纤维，利用ESCA分析了冷等离子体处理前后的纤维表面元素组成、官能团类型的变化。
Thus the training samples were established using the elemental composition of the frictional pair materials as the inputs of ANN and the corresponding frictional parts as the outputs of ANN.
将机械摩擦副材质的元素含量作为神经网络输入，将材质所对应的部件作为神经网络输出，建立了相应的神经网络训练样本；
Objective: To evaluate the influence of air oxidation, anodizing and TiN coating sample on elemental composition and thickness of surface film of cast pure titanium.
目的：评价大气热氧化、阳极氧化和氮化钛镀膜对铸造纯钛表面膜组成和厚度的影响。
The elemental composition and valence state of the elements and their changes with the variation of depth were investigated by mains of XPS.
用XPS研究了渗硼层磨损表面的成分、元素价态及其随深度的变化。
The elemental composition and the temperature of thermal explosion are principal factors to influence the reactions and morphology of the products.
体系成分和热爆温度是影响反应及产物形态的主要因素。
Analysed the bulk elemental composition, the surface elemental distribution and chemical structure of the CBp. The results show that CBp has more inorganic components and volatile components.
较为全面地分析得到了再生炭黑的整体组成、元素构成以及表面化学特性。
The paper describes in detail the system consisting of network architecture, elemental composition, method of realization, software module and modular function etc. The application of the syst…
本文详细介绍该系统网络结构、基本构成、实现方法、软件模块和模块功能等。
Trace elements in soil of Tumotezuoqi were similar to the background levels of elemental composition of soil in the world.
土壤中微量元素的含量与世界土壤背景值相似。
The elemental composition and concentrations of trace elements in seawater, suspended matters, and marine rain are presented for samples collected at the Western Pacific Regions.
本工作测定了西太平洋海域中海水、海水悬浮物和海面上雨水的元素组成和浓度。
The elemental composition, properties and main uses of the wollastonite short fiber were described. The wollastonite short fiber fiberglass epoxy resin EMI 2.4 composite was stu***d.
本文叙述了硅灰石短纤维的组成、性质及主要作用，重点研究硅灰石短纤维—玻璃纤维—环氧树脂—咪唑缠绕增强体系。
Combined with the results of INAA and glaze study, this change in elemental composition should be caused by the change in porcelain raw materials or body-****** crafts.
结合中子活化分析及瓷釉研究的结果来看，这种改变应是因其制瓷原料或胎料配方发生变化引起的。
The choreography of composite services defines their flow and composition from elemental services.
组合服务的编排通过基本服务定义其流程和组成。
Using XPS and imaging XPS analyses, we have investigated the surface chemical composition and elemental distribution of PCL/PVC films.
用XPS和成象XPS分析技术，对PCL/PVC膜的表面化学组成和元素分布情况进行了研究。
The composition and structure were analyzed through elemental analysis, molar conductance, IR, UV-Vis and X-ray powder diffraction.
通过元素分析、摩尔电导、红外光谱、紫外-可见光谱、X-射线粉末衍射对三元配合物的组成和结构进行了分析。
The monomer reactivity ratios of NPMI with StAN in radical copolymerization are determined at 60 in benzene solution, and the composition of the terpolymer is calculated by elemental analysis.
测定了60℃下N-苯基马来酰亚胺在苯溶剂中分别与*********、丙烯腈共聚的二元竞聚率，并据此估算其三元共聚物组成。
Elemental and TG analysis confirmed the purity, The composition and structure of DBC-chlorophosphonazo were also determined.
并用元素分析和热重分析确证了其纯度。对DBC-偶氮氯膦的组成和结构也进行了测定。
Lanthnide complexes of diacethyldioxime were synthesed. The composition and structure of the complexes were determined by elemental analysis, IR, UV-Vis and mole-conductivity.
合成了*********二肟的稀土金属配合物，并通过元素分析、红外光谱、紫外光谱及摩尔电导测定，初步确定了配合物的结构。
元素组成（Elemental Composition） 指物质中所有化学元素的种类及其相对比例（通常以质量百分比、原子百分比或摩尔分数表示）。它描述了构成该物质的基本化学元素是什么，以及每种元素所占的分量，是物质化学本质的核心特征之一。
核心含义解析：
测量与重要性：
应用领域举例：
总结来说，元素组成是描述物质由哪些基本化学元素构成以及它们之间定量关系的核心概念，是连接物质的微观构成与其宏观性质、行为和应用的关键桥梁。
“Elemental composition”（元素组成）指物质中不同化学元素的种类及其相对含量，通常以质量百分比、原子百分比或摩尔比的形式表示。这一概念广泛应用于化学、地质学、材料科学和环境科学等领域。
元素种类
指物质包含的化学元素，例如水的元素组成是氢（H）和氧（O），而空气主要由氮（N）、氧（O）、氩（Ar）等元素构成。
相对比例
各元素在物质中的占比，例如二氧化碳（CO₂）中碳和氧的原子比为1:2，质量比为12:(16×2)=3:8。
分析方法
应用场景
若某化合物分子式为C₆H₁₂O₆（葡萄糖），其元素组成的质量百分比可计算为：
$$
text{碳占比} = frac{6 times 12}{6 times 12 + 12 times 1 + 6 times 16} times 100% approx 40%
$$
同理可得氢和氧的占比。
若需进一步了解具体分析方法或案例，建议参考化学教材或专业文献。
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