地下渗滤系统对直链烷基苯磺酸盐(LAS)的去除研究

直链烷基苯磺酸盐的广泛运用,使其成为环境中最常见的具有代表性的一类有机污染物,其环境行为与环境效应也受到普遍的关注。以生活污水中直链烷基苯磺酸盐为对象,研究了地下渗滤系统对其去除效果以及对其他污染物去除和基质微生物量的影响。结果表明:污水中直链烷基苯磺酸盐浓度在0.56~40mg/L,地下渗滤系统对直链烷基苯磺酸盐的去除率达到90%以上;直链烷基苯磺酸盐去除率随着其浓度的增加而增加。随着直链烷基苯磺酸盐浓度的升高,COD、TN、TP和IP的去除率下降,而NH+4-N的去除率几乎没有变化;基质中细菌、真菌、放线菌的数量均出现下降,硝化菌数量变化很小,反硝化菌数量先增加后减少。     

烷基苯同分异构体结构与其沸点的定量关系研究

在有机化合物的结构与性能关系研究中，拓扑指数的应用极其广泛，构造方法各异，并通过回归分析得到相应的定量关系式．目前有许多关于对烷烃、烯烃、炔烃、卤代烃等物化性质与结构间关系的研究报导，对烷基苯的研究报道相对较少．有人［１］对直链烷基苯的沸点作过研究，...     

碳氢化合物性质的计算Ⅵ、直链烷基苯同分异构体的沸点

本文用拓朴方法探讨了直链烷基苯同分异构体的沸点与其分子结构之间的关系，提出了一种直接根据分子结构计算沸点的新方法，结果表明，沸点计算值都接近实验值，平均误差仅0．1395计算精度优于文献上其它方法。     

负载磷钨酸催化剂合成直链烷基苯工艺条件的研究

考察了固定床反应条件下负载磷钨酸合成直链烷基苯的工艺条件。结果表明：它有两种酸中心,在150～160℃预处理后活性高,对原料中的水敏感;低温活性高,2位产物异构体选择性好,并且在实验室中具有较好的活性稳定性。     

碳原子数估算有机物的热力学函数

以文献报道的部分正烷烃、正烯烃、正炔烃、正烷基苯、正烷硫醇２９８Ｋ下气态化合物标准生成焓、标准生成自由能、标准熵的数据为基础，通过计算机进行回归分析，得到了这些有机物的标准生成焓，标准生成自由能，标准熵均与碳原子数（ｎ）呈良好的线性关系．即据这些关系式分别计算了一系列直链有机物的，其结果与文献值相吻合．     

汾江河水LAS降解特性研究

对汾江河本底LAS(直链烷基苯磺酸盐)静态降解情况进行了实验测定，讨论了LAS生物降解影响因素计算确定了河水LAS降解系数。研究测定结果表明，前12h的降解速率与LAS的初始浓度关系十分密切，LAS的初始浓度越低，前12h的降解速率越高。天然水中微生物对高浓度LAS的降解动力有所削弱。     

烷烃中少量芳烃的固定床和模拟移动床吸附

在实验研究烷烃中少量芳烃的固定床吸附动态过程和模拟移动床吸附动态过程的基础上，用固定床和模拟移动床线性推动力模型进行了模拟计算，可得到如下结论：在本文的实验条件下，固定床吸附动态模型和模拟移动床吸附动态模型拟合的结果均与实验值相符；但从技术性能指标和技术经济指标两个角度都反映出对脱除烷烃中的少量芳烃的吸附分离过程，用固定床吸附过程比模拟移动床吸附过程更具有可行性。这些结果为在直链烷基苯的生产过程中，附低循环烷烃中芳构化物的含量，实现延长脱氢催化剂的寿命，提高烷基苯的产量提供了技术基础。     

烷基苯磺酸盐急性毒性的QSAR研究

以均阶指数(I),Wiener指数(W)和极性指数(P)作为烷基苯磺酸盐的分子结构描述符,并用I,W,P与烷基苯磺酸盐对蓝鳃鱼的急性毒性(lg LD50)进行关联,所得方程的相关系数为0.999 9,计算值与实验值很好地吻合,平均误差仅为0.007,结果明显优于文献方法.     

烷基苯分子结构与分配系数间定量关系的研究

应用Benson基团加和法，对烷基苯分子结构与分配系数间的关系进行了研究。对部分烷基苯的正辛醇／水分配系数做了估算，估算结果表明烷基苯分配系数的对数值具有良好的基团加和性，预测值与测量值吻合很好。     

烷基苯同分异构体结构与摩尔折射度的关系

根据分子结构的特点，用拓扑方法探讨了烷基苯同分异构体摩尔折射度与分子结构的关系，提出了１个既能合理表征烷基苯的结构性能关系，又能预测其摩尔折射度的定量关系式．对１１４种烷基苯的计算结果表明，摩尔折射度预测值接近实验值，平均误差０．２０３％．     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to