化学

In view of geological records preserved from different regions of the world are not identical, it's suggested that, when correlating the Ordovician-Silurian boundary, at the global boundary stratotype section, the FAD of N. persculptus be selected as the biomark, the transgression event identical to the FAD of N. persculptus as the auxiliary physical mark and the mass extinction and chemical anomaly events respectively as the auxiliary biomark and chemomark. In some regions with few graptolite, the Ordovician-Silurian boundary should be indicated by the auxiliary marks, such as the transgression event, mass extinction or chemical anomaly event, with the other fossil such as conodont nearest to other geological events as the provincial biomark for correlation. In other regions with much stratigraphic hiatus originated from the regression, the Ordovician-Silurian boundary should be marked by the regression-transgression event nearly relevant to the N. persculptus Zone.

鉴于不同地区留下的地质记录不完全相同，奥陶/志留系界线对比方法不同：在界线层型剖面上，以N.persculptus的首现为生物标志，以与之基本一致的海侵事件为辅助的物理标志，以生物集群绝灭事件和化学异常事件为辅助的生物和化学标志；在笔石极不发育的地区，则以海侵事件、生物绝灭事件或化学异常事件为辅助标志，以与其相距最近、并且具有区域对比性的其它门类化石作为界线对比的生物标志；对于由于海退事件所造成地层缺失很多的地区，则以海退/海侵事件作为划分界线的物理标志，并以相映的海侵事件的开始作为奥陶/志留系的分界。

Based on the development of the time and the actual conditions of Tibet, this paper discussed the importance of offering chemistry course, analyzed the current conditions and problems existed in chemical teaching in our college, gave advice on how to strengthen curriculum construction of chemistry, put forward the corresponding countermeasures according to the current situations of Tibet.

论述了开设化学课的重要性，针对西藏的实际，对培养具有高素质人才建设的战略性任务及目前我院化学教学的现状进行了分析，并对教学过程中存在的问题进行了探讨，提出了加强我院化学课程建设的建议，立足于时代的发展，依据当前西藏的新要求，结合西藏实际，提出相应的建设对策。

This paper is about the idea of green chemistry and how to express it in the choice, design and teaching of chemistry experiments.

本文介绍了绿色化学的思想，以及在化学实验的选择、设计和教学实施中如何体现绿色化学的理念。

We have observed gaseous diatomic molecule on the semiconductor surface with the chemical-physics dynamic mechanism of the chemical adsorption on the dangling bond. We explored on the phenomena in how gas molecules dissolve, how the atoms move, and on how they replace the bondings during the chemical adsorption process on the surface.

本论文主要在研究气态双原子分子化学吸附於半导体表面悬键上的化学物里动力学机制，并探讨气体分子在表面化学吸附过程中的分子裂解、原子移动、取代键结等现象。

However, it was difficult to determinate electron affinity by experimental methods.

在很多领域如基础化学、材料化学、环境化学，电子亲合势起着重要的作用。

Under the direction of modern education theories and using the experience of domestic and international vocational course reform for reference, the author ponders deeply over the structure theory and envisagement...

运用中等职业学校正在推广的"宽基础、活模块"的课程改革理论和课程综合化理论，针对学生的毕业去向，实施分层教学，提出了烹饪专业设立基础化学、烹饪基础化学和综合化学的课程方案。

And the application of chemometrics in complicated biochemical system can solve some problems and obtain the equilibrium concentration and pure spectra of each component. This thesis is divided into five parts: Part I In part one, firstly, the structures, functions and natures of proteins were introduced briefly.

本论文尝试将化学计量学方法多元曲线分辨-交替最小二乘法用于解析实验得到的光谱数据，讨论了方法的原理和实际应用，并探讨了化学计量学在复杂的生物化学体系中实现同时解析多组分平衡浓度和纯光谱的可行性。

By the way of using chemical analysis, FT-IR and ESCA, a comprehensive analysis have been focused on the bulk and the surface characters of Asplund defi bated wheat straw, which was the first trying in China.

利用化学分析法、傅立叶红外光谱、化学光电子能谱等手段研究了麦秆纤维的化学组成在不同处理条件下的变化规律以及麦秆纤维中纤维素、半纤维素、木素在不同处理条件下的结构变化等。

In this paper, the reviews of chemical weathering, global carbon cycling and the interrelation among their characteristics as well as the studies on fluvial hydro-chemistry at home and abroad are included.

本文综述了化学风化作用与全球碳循环的研究现状，着重介绍了化学风化作用与碳循环的特征之间的相互作用关系，详细阐明了在二者的影响下国内外河流水化学的研究成果。

Based on the data of aerosol chemical compositions obtained at WMO GAW (World Meteorological Organization Global Atmospheric Watch) station in eastern China－Lin'An regional background air pollution monitoring station, two methods (referred as Malm method and Stelson method) that were described by Malm (Malm et al.,1994) and Stelson (Stelson and Seinfeld, 1981) were used to study the mass closure of sampled aerosols.

本文通过在WMO GAW 区域大气本底污染监测站－临安大气本底污染监测站采集的气溶胶样品的化学成分的分析结果，分别用Malm（1994）和Stelson（1981）提出的方法（分别记为Malm方法和Stelson方法）重建气溶胶质量浓度，并与称重获得的质量浓度进行对比，发现虽然Stelson和Malm方法所考虑的物质组成及所使用的化学成分个数并不相同，其计算结果略有差异，但总的来说两种方法都能较好的反映绝大部分的气溶胶质量，在实际应用中可以根据所分析的化学成分数据情况和研究的目的采用不同的质量重建方法。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。