Study on the isotherms of the interaction between suspended particles and Cu (II) in the Huanghe River

The isotherms of the interaction between the suspended particles and Cu²⁺, and the effects of lysine and asparaginic acid on the isotherms in the Huanghe (Yellow) River were studied by applying the theory and method of interfacial stepwise ion/coordination particle exchange. We obtained a new stepped river isotherm, formed by two curves joined together with a “plateau” in the middle. The adsorption equilibrium constantsK ₁ andK ₂ were calculated by using the isothermal equation of surface stepwise ion exchange. Amino acid in small amount promotes exchange adsorption of the suspended particles with Cu²⁺. The degree of promotive action relates to the isoelectric point of amino acid. The promotive effect of lysine is bigger than that of asparaginic acid. Project 29361001 supported by NSFC.     

Embankment deformation analyzed by elastoplastic damage model coupling consolidation theory

The deformation, of embankment has serious influences on neighboring structure and infrastructure. A trial embankment is reanalyzed by elastoplastic damage model coupling Blot＇ s consolidation theory. With the increase in time of loading, the damage accumulation becomes larger. Under the centre and toe of embankment, damage becomes serious. Under the centre of embankment, vertical damage values are bigger than horizontal ones. Under the toe of embankment, horizontal damage values are bigger than vertical ones.     

一种新的水面蒸发计算方法

本文应用相似理论,提出一个考虑自由对流和强迫对流相结合的水面蒸发模式,并用实测资料对蒸发模式作了检验。     

1995年康定城区洪灾成因分析

分析洪灾成因 :长时间连续降雨和随后而至的暴雨 ,是山洪成灾主要因素 ;特殊的水系结构使洪峰流量在城区河流汇合处叠加 ;山洪的动能大 ,挟带泥沙和冲蚀能力强 ;泥石流、滑坡、崩塌强烈活动 ,为山洪提供大量泥沙、推移质 ;人类经济活动不当 ,加大了灾害损失     

西安城市化对气温变化趋势的影响

利用1951-2006年西安及周围3站点的气象数据分析了城市气温变化和周围台站温度变化的差异,给出了4个测站不同阶段、不同季节城市化影响气温变化的趋势系数及线性变化趋势。结果表明：城市化对气温的影响具有明显的阶段性和季节性。1980年以前,无论平均气温还是月最低气温和最高气温,西安与其周围站点的线性趋势系数及线性变化趋势相差不大;但在1980年以后,城市站的线性趋势系数明显大于周围站点的趋势系数,特别是在1993年以后,西安站的平均气温、最高和最低气温线性趋势系数远大于其周围站点的趋势系数,是周围站点的1.6~3.5倍,说明城市的热岛效应不但提高了城市的温度同时也改变城市的增温率,使得城市气温增温率加大。西安及其周围站的线性增暖趋势在春季最大,其中西安达到2.20 ^oC/10a,是其它季节的2~4倍;秋季的线性增暖幅度次之,夏季最小。热岛效应对最高气温的最大贡献在春季,对最低气温的最大贡献在冬季。     

油源对比常规方法的使用误区

通过采用不同方法得出不同认识的三个实例 ,说明油气地球化学研究中较常采用的正相关系数法、分布指纹对比法以及碳同位素类型曲线法存在误区与使用不当之处 ,应该提倡采用多参数、多指标的散点图法以及多元统计分析等来进行油源综合对比     

利用目标区域拓扑关系图提取建筑物点云

以激光点云数据和倾斜多视影像为研究对象,提出了一种结合机载点云、地面点云及倾斜多视纹理的融合多源特征的建筑物三维模型重建方法。该方法结合点云面元以及影像边界特征,利用倾斜影像的线特征对顶面及立面模型进行边界规则约束,实现了面元自动拓扑重建;通过交互编辑完成不同复杂程度的建筑模型重建,并对模型进行纹理映射。实验结果表明,该方法能够有效提升城市建筑物三维模型重建的效率和边界精度,为利用多源数据的空地联合建筑物三维精细重建提供了一套切实可行的解决方案。     

一种基于特征子空间的多用户盲分离算法

提出了一种基于特征子空间的多用户盲分离算法。算法首先估计出信号源的导向矢量,然后再利用ESB算法进行波束形成,解决了当存在多个用户时权值收敛于单一用户的问题,可以在不知道信号先验知识的情况下对来自不同方向上的独立信号进行有效的分离。算法不需要进行繁琐的Gram—Schmidt正交化处理,并且在盲分离信号的基础上还可以估计出信号的波达方向。计算机仿真结果表明,分离出来的信号与源信号的相关系数均大于0．99,证实了算法的有效性。     

The Impact of Irrigation on Bacterial Community Composition and Diversity in Liaohe Estuary Wetland

In this study, the sequencing of 16S ribosomal DNA was used to characterize the soil bacterial community composition and diversity in Liaohe estuarine wetland. Soil samples were taken from different locations in the wetland dominated by reed. Moreover, the soil quality parameters were evaluated (pH, moisture, organic matter, total nitrogen, available nitrogen, total phosphorus, available phosphorus). The results showed that the organic matter and nutrient contents were significantly higher in irrigated wetland than those in natural wetland. Major phylogenic groups of bacteria in soil samples including Proteobacteria, Acidobacteria, Gemmatimonadetes, Actinobacteria and Cyanobacteria were analyzed and we found that Proteobacteria was the most abundant in the community, and the phylum Acidobacteria was more abundant in irrigated wetland. Beta diversity analyses indicated that the soil bacterial community was mainly affected by sampling sites rather than seasons. In general, the bacterial community in natural wetland was not significantly different with that in artificial irrigated wetland. Artificial hydraulic engineering irrigated according to the water requirement rule of reed, increased the production of reeds, changed the way of wetland soil material input, but the diversity of bacterial community kept stable relatively.