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The research progresses in degradation technologies of benzene or some of its derivatives in water are reviewed.The macroscopical reaction mechanism of HNO2(NO2-)and C6H5Br in aqueous solution has been studied.Different influence factors have been discussed,including different pH condition,initial concentration,irradiation time,different anions and the optimization of experimental conditions.By using liquid chromatography,the degradation rate of bromobenzene has been qualitatively analyzed.The concentration variations of Br~and NO2- have been analyzed by using ion chromatography.

本文介绍了苯及其衍生物对水环境所造成的污染和危害，研究了365nm光照下HNO2(NO2-)与C6H5Br混合溶液的宏观反应过程，初步考察了混合体系中溴苯的降解及衰减行为，较为系统地探讨了影响溴苯降解过程的各种影响因素，包括溶液的pH值、初始浓度、光照时间、不同离子的影响以及实验条件的优化，并利用液相色谱法进行定量研究溴苯的降解率，利用离子色谱法分析检测实验过程中溴离子和亚硝酸根离子的变化。

Using the static chamber and Chromatograph method, H2S and COS emission from the marsh meadow Calamagrostis angustifolia and typical meadow Calamagrostis angustifolia were measured during growth season (5-9 month). the results showed that the seasonal and diurnal variations of H2S and COS emission were both obvious, the mean emission of H2S and COS from the marsh meadow Calamagrostis angustifolia were 0.34μg?

利用静态箱／气相色谱法，观测了小叶章沼泽化草甸和小叶章典型草甸两种湿地类型中H2S和COS在生长季（5-9月）的释放动态，结果表明：在两种小叶章湿地中，H2S和COS的排放通量均具有明显的季节和日变化规律。

This thesis dedicated to research the investment control of BT project, researched the risk in the program construction, the compose portion and the factors effecting the investment. The research includes the conception and the character of the BT project; the actualize process and the questions should be pay attention to; the conditions of BT contract and the sector of the compose poison of the contract price. In this part researched the conception of the BT purchase price and concluded that the relation between the purchase price and the investment. Then studied the risk factors that effect the investment according to the character of the project and then brought forward several advices of the contract item about how to share the risk. Studied compose sector and it's calculatingly methods of the construction cost which is the main part of the investment, then studied how to control the cost during the construct process and analyzed project variations as well as how control that. In the end, researched the capital cost of BT program, the main content include the concept of the capital cost, the calculatingly methods using the engineering economic method, the method writer suggest in the thesis according to the project practice, how to control the capital cost, mainly through setting up an account and inspecting it, and regulating the program financing rate in reason.

本论文的研究重点即BT项目的投资控制，围绕该问题，本论文的主要研究内容有，从BT模式和BT项目的基本分析开始，研究了BT模式的基本概念、BT项目的运作过程、基本特征；研究了BT项目的合同条件和合同价款，该部分分析了BT项目的合同结构、BT项目的承发包工作范围、BT项目的回购价款组成和确定；根据项目建设特征分析了影响BT项目投资的风险因素，并且提出了在对风险进行分配和分担类合同条款制定时建议；建设工程费用是构成BT投资的主体费用，本文对其各组成部分的基本构成、计算方式进行了分析，研究了实施过程中管理控制和工程变更及变更控制的问题；文章的最后对构成BT项目投资的资金成本进行了探讨，分析了资金成本的概念和形成，运用工程经济学的基本理论分析了资金成本各部分的基本计算方式，依据现有的工程实践情况提出了本文建议的计算方式，最后分析了如何对资金成本进行控制――主要通过设立资金账户对其进行监管以及对项目融资的利率进行合理规定。

Trees growing close to their thermal limit of distribution, such as at high-latitude or high-altitude upper tree-line, react to variations in temperature through its influence on cambial activity. Tree growth was mainly influenced by temperature at the upper tree-line, so there was more temperature information in tree-ring width chronology in middle Qilianshan Mountains.

祁连山中部地区森林上限的树木生长主要受温度变化的影响，年轮宽指数序列中主要包含温度变化信息，对树轮生长影响最大的气候因子为前一年12月～当年4月平均温度。

Study on the Morphological Variations of Cerasus subhirtella var. ascendens in Different Populations

不同居群野生早樱形态变异研究，王贤荣；谢春平；伊贤贵；向其柏-66文免费论文库，大学生论文库

The study aimed to investigate horizontal variations in photosynthetic photon flux density and transmittances under a Taiwan red false cypress (Chamaecyparis formosensis Matsum) canopy as the basis for ecological and silvicultural researches.

本研究主要目的为探讨红桧人工林内光合光子流密度之空间变异，以及不同冠层密度下透光率之变化，作为生态学及育林学相关研究之基础。

This view shows color variations in bright layered deposits on a plateau near Juventae Chasma in the Valles Marineris region of Mars.

这个视图显示附近Juventae往前在火星水手谷地区高原明亮的色彩分层存款的变化。

Thisview shows color variations in bright layered deposits on a plateaunear Juventae Chasma in the Valles Marineris region of Mars.

这个视图显示附近Juventae往前在火星水手谷地区高原明亮的颜色分层存款的变化。

ITS2 and M8 DNA sequences with large variations were screened out of twelve DNA fragments (four nuclear, four chloroplastic and four mitochondrial) to identify tea varieties in Taiwan.

本研究由4个细胞核及8个细胞质（含4个叶绿体及4个粒线体）序列变异较大之片段筛选出具较大序列变异性之ITS2及M8片段，目前开发出ITS2序列与粒线体部分序列，其中品种间ITS2具有33个单一核苷酸多型性，而品种间之M8具有5个核苷酸缺失/插入及2个单一核苷酸多型性。

Blood samples were collected daily before and after infusion for assaying plasma IGF-1 levels and studying dynamic variations in plasma IGF-1, and effects of cholic acid on t...

在灌注前和灌注后每天定时采取血样，测定血浆IGF -1水平，研究绵羊围产期血浆IGF -1的动态变化及胆酸负荷对其的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。