化学

A quantitative appraisal of the prospect of uranium mineralization is completed based on a set of hydrochemical data acquired from the known in-situ leachable sandstone-type uranium, including radon content, acid-alkali ratio, oxidized and reduced electronic potential, hydrocarbonate radical and uranium content in water.

但是在找铀过程中仅用水化学成份、氡含量、酸碱度和氧化还原电位等数值进行描述，说明它们与铀矿化的关系，这种单一因素的描述不能综合反映与铀矿化的联系程度，以定量评价铀矿化与上述因素的关系，从而影响了水化学找矿的效果。

The determination of hydrochemical facies type is a tool to control groundwater from pollution any deviation from background water facies can be related to pollution.

水化学类型的确定是研究地下水污染的有效方法，当某一地区的地下水化学含量与环境背景值相差较大时，即可以看作地下水受到了某种程度的污染。

Urban soil bodies generally exist in the hydrochemistry environment of normal temperature, atmospheric pressure and slow variation. Under this kind of conditions, the chemical components in soil, which are an essential factor affecting the stability of soil, play an important role in this kind of environment, and also have an important influence on surface subsidence, production of earth holes and so on.

城市区域的土体环境一般是处在常态即常温、常压、缓变异的水化学环境中，在这种环境中，影响土体稳定的要素－土体中的化学组份扮演著重要的角色，而其对诸如地面沉降、土洞的产生都有重要影响。

River hydrochemistry change may reflect human influence on water environment in a certain degree,and the grasp of river hydrochemistry characteristic and distribution rule is helpful to reasonable use and protect water resources.

河流水化学的变化可以从一定程度上反映出人类活动对水环境的影响，掌握河流水化学特征及其分布规律有助于合理利用和保护宝贵的水资源。

On the other hand, Cu, Co and Ni are all present in manganese phase in the hydrogenic nodules.

这些过渡金属元素在成岩作用形成的结核中的存在与铁锰结核中锰矿物和铁的氧化物、氢氧化物的晶体化学特征密切相关，而在水成作用形成的铁锰结核中的富集与锰矿物和铁的氧化物、氢氧化物的晶体化学特征关系不大。

In this study, the amount of ethylene and its key biosynthesis genes expression, typical allelochemical hydroxamic acid concentration and the key regulation genes (BX1 and BX9), as well as the dynamic expression and time of relevant defense key genes of secondary substance metabolism processes were compared in ethephon treatments of different concentration and duration.

为探明外源乙烯利对玉米化学防御作用诱导的浓度和时间效应，本文采用化学和分子生物学相结合的方法，研究了不同浓度乙烯利处理玉米后，叶片乙烯释放量及其合成调控关键基因ACS和ACO表达的变化，典型化感物质丁布的含量及其关键调控基因BX1和BX9表达的变化，以及其他调控次生代谢物的关键基因表达的时间动态。

In this thesis, two classes nonquaternary Cholinesterase Reactivators (1,2,4-oxadiazole and a -ketothio Hydroximic Acids derivatives ) and some clinical therapy used reactivators added to almost 40 cases have been caculated by using Comparative Molecular Field Analysis,ab initio and molecular mechanism methods. The characteristics of the molecular orbitals and the quantitative structure-activity relationship have been investigated.

本文利用比较分子力场法，量子化学从头算法，分子力学及计算化学回归分析等方法，对1，2，4-oxadiazole类非季铵肟胆碱酯酶复能剂，α—酮硫代异羟肟酸酯复能剂及部分现临床使用的复能剂，近40个化合物进行了计算，分析和研究了其电子结构和几何结构特征，建立了定量构效关系方程，得到了以下一些有意义的结果。

Results showed the hygrothermal ageing of the composites lied in the combination of hydrolysis and damage of the interface.

其老化因素由物理因素和化学因素构成：前者主要包括热、光、电、高能辐射和机械应力等，后者则包括氧化作用和化学介质如水、酸、碱的作用。

The hypogeal insect pests of eucalyptus are a group of special insect pests, having made serious damages to the young plantation. To solve the problem, it is necessary to use chemicals to control the population of those insect pests. The selection of chemicals and the methods of chemical application must be appropriate so as to lighten and minimize the negative impacts of chemicals on the ecological environment.

桉树地下害虫是一类特殊的害虫群体，在造林初期的危害比较严重，此时应针对不同的害虫选用不同的化学药剂来控制其种群密度，施药时要考虑减轻化学药剂对生态环境的不利影响，应采用毒饵诱杀、根部施药等方式。

Keywords structural chemistry;IChO competition;the senior middle school's;chemistry teaching;application

Article From 辽宁师范大学；课程与教学论硕士论文 2005年度结构化学； IChO竞赛；高中化学教学；应用

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。