楚雄州汛期极端降水时空分布特征

利用1961-2010年中国地面降水日值格点数据集,采用百分位阈值、小波分析和MK检验等方法,对楚雄州汛期极端降水的时空分布特征进行了分析.结果表明:1极端降水阈值、极端降水总量及极端降水强度的空间分布具有一致性,呈现由东北-西南连线分别向西北及东南部递减,东北-西南一线呈现由东北及西南两端向中部递减的趋势;极端降水日数呈现出由南部及东北部向北部及西北部递减的趋势.2极端降水总量及极端降水日数具有较为显著且一致的年际波动特征,而极端降水强度年际波动特征不明显.3极端降水总量及极端降水强度均呈不明显上升趋势,而极端降水日数无明显变化.4极端降水总量、极端降水日数及极端降水强度均存在25年左右的主震荡周期,且极端降水总量与极端降水日数周期变化较为一致.     

Theoretical study on photophysical property of C_(60)M(CO)_5 (M=Cr,Mo and W)

Configurations of three η2 models of transition-metal 60 fullerene derivatives C60M(CO)5(M=Cr,Mo and W) have been optimized at B3LYP/LanL2DZ level.On the basis of the optimized geometrical structures,their electronic spectra and the frequency dependence of third-order nonlinear optical polarizabilities γ in different optical processes of third-harmonic generation(THG),electric-field-induced sec-ond-harmonic generation(EFISHG) and degenerate four-wave mixing(DFWM) are calculated by using TDB3LYP model based on LanL2DZ level coupled with the SOS(sum-over-state) method.The obtained results show that their electronic spectra have a red shift compared with that of 60 fullerene and dif-ferent transition-metal functional groups added to C60 cage may result in different spectrum properties.For the three studied species,(η2-C60)Mo(CO)5 has the largest third-order nonlinear optical polarizability.     

Study on Optimizing Thermal Energy Storage Capacity for Heat Supply System

Thermal energy storage (TES) can increase the energetic efficiencies and, in many cases, the exergetic efficiencies of thermal energy systems. Steam boiler plant with a violently fluctuating load is a typical example when a steam accumulator is added to it. While the comparatively big first cost constitutes a barrier to the wide use of TES, the cost will notably be reduced through minimizing the necessary thermal capacity of it. The structure and illustrations are given for the computer program designed for performing the optimization. This program was applied to an existing boiler plant equipped with a steam accumulator. The results show that there would have been a big reduction in the necessary capacity, if the design of this steam accumulator had been optimized. Four conclusions have been reached.     

不夜城的快速繁殖

以不夜城幼茎为材料，经表面消毒后接种于诱导培养基上，4周左右出现不定芽不定芽在壮苗培养基上培养2周转至生根培养基上，又经3周长出完整根系，再生根株炼苗后移栽到基质中，移栽成活率为90％。     

AMSAA-BISE Model and Its Statistical Inference

In this paper the AMSAA model is generalized to the reliability growth testing of mul-ti -system simultaneous development, therefore it is named the AMSAA -BISE model . The MLE and unbiased estimates of the parameters for the system and a goodness of fit test from failure-truncated data and time truncated data are given.     

基于EIO-LCA模型的中国部门温室气体排放结构研究

基于中国2007年经济投入产出生命周期评价（EIO-LCA）模型,构建了部门温室气体排放矩阵,从生产和需求两个视角分析了温室气体排放在部门间的分布结构。此方法将两个分析视角整合在同一个框架内,能更好地认识温室气体排放与部门生产和最终需求的关系。结果表明：1）从生产角度看,电力、热力的生产和供应业的直接排放量最大,占20...     

多媒体教学在环境化学课程中的改革与实践

分析总结了多媒体在《环境化学》教学中的优点以及不足之处,提出了进一步改革和完善多媒体在《环境化学》教学中的方法和措施.     

基于GIS的城市地下管线综合信息系统

针对城市地下管线信息管理过程中涉及数据复杂、隐蔽等特点,将GIS引入地下管线信息管理中,搭建了基于组件式GIS的城市地下管线综合信息系统应用框架。分析了使用ArcEngine集成技术在城市地下管线综合应用过程中的优势,探讨了利用GIS集成技术在城市地下管线数据集成、信息采集、信息处理及空间分析等一系列操作过程。系统采用Visual C#2005与ArcEngine集成技术和Oracle 9i数据库平台,运用ArcSDE空间数据库引擎综合应用开发,不仅能够充分发挥GIS的矢量数据对城市地下管网分布情况的编辑、管理、分析等功能,还能够对地下管网受损受害地点的快速、精确定位管理具有一定的应用参考价值。     

两种制革废水生化处理组合工艺的效能比较

 借助于实际工程的运行,比较了水解酸化与序批式活性污泥法(SBR)组合工艺(H-SBR)和接触氧化与SBR组合工艺(O-SBR)两套设施处理制革废水的效能。结果表明,接触氧化与SBR组合工艺能有效处理制革废水,在接触氧化HRT 24h、SBR曝气5-7h的条件下,COD和氨氮平均去除率可分别达到83%和74%,出水平均浓度分别为273和42mg/L。采用水解酸化与SBR的组合工艺对预处理后的制革废水进行处理,在水解酸化HRT 24h、SBR曝气5-7h的条件下,COD和氨氮平均去除率分别仅为70%和5%,虽然COD可降低到500mg/L以下,但氨氮高达163mg/L左右,且需配套臭气处理设施。