福州市内河浮游动物群落生态周年研究

2000年9月至2001年8月，在福州市内河的主干道设置12个采样点进行为期一周年的浮游动物群落生态研究，共检出浮游动物263种，其中原生动物139种，轮虫95种，枝角类22种，桡足类7种．确定了内河的常见种和优势种，主要有绿眼虫、梨形四膜虫、多小核草履虫、瓶累枝虫、螅状独缩虫、红眼旋轮虫、懒轮虫、长足轮虫、萼花臂尾轮虫、角突臂尾轮虫和发头裸腹淹等．分析了内河12个采样点浮游动物数量和质量浓度的周年变化，没有得出明显的季节变化规律，但浮游动物出现的种类数和水温密切相关．浮游动物的优势种多以耐污种类为主，这表明福州内河的水质没有得到改善，甚至比10年前有所恶化．     

武汉东湖底泥中轮虫休眠卵萌发的研究

将１９９３年１２月～１９９４年９月间武汉东湖底泥样品依次在１０．Ｃ、２０．Ｃ和３０．Ｃ下进行萌发，并鉴定所孵出的轮虫种类及其数量．结果表明底泥中轮虫休眠卵年平均数量为（６．１５±４．１７）ｉｎｄ／ｍｌ；休眠卵总数量及臂尾轮虫属（Ｂｒａｃｈｉｏｎｕｓ）、疣毛轮虫属（Ｓｙｎｃｈａｅｔａ）、龟纹轮虫属（Ａｎｕｒａｅｏｐｓｉｓ）、异尾轮虫属（Ｔｒｉｃｈｏｃｅｒｏａ）、多肢轮虫属（Ｐｏｌｙａｒｔｈｒａ）及多肢拟前翼轮虫属（Ｐｒｏａｌｉｄｅｓ）等主要轮虫属休眠卵数量均呈由表层向层逐渐递减的趋势．同时，各属轮虫休眠卵数量变有明显的季节变动．疣尾轮虫属，龟纹轮虫属、多肢轮虫属休眠卵的数量均以夏季最高，而臂尾轮虫属休眠卵数量高峰出现在秋季，多须拟前翼轮虫属则在春季     

广州城市河段和湖泊轮虫群落结构的研究

2005年12月-2006年11月,对珠江广州河段及天河、流花公园内湖泊轮虫群落结构进行了初步研究.经鉴定,共发现轮虫21属77种(包括亚种).其中湖泊的优势种分别为暗小异尾轮虫(Trichocerca pusilla)、微型多突轮虫(Liliferotrocha subtilis)、裂痕龟纹轮虫(Anuraeopsis fissa)和剪形臂尾轮虫(Brachionus forficula),而广州河段则是微型多突轮虫(Liliferotrocha subtilis)、裂痕龟纹轮虫(Anuraeopsis fissa)、暗小异尾轮虫(Trichocerca pusilla)、角突臂尾轮虫(Brachionus angularis)和尾突臂尾轮虫(Brachionus caudatus).轮虫数量的两次高峰分别出现在春末夏初和8月份.全年最高密度为5 494 ind./L(中大采样点,2005年12月),最低密度为117 ind./L(中大采样点,2006年7月).枯水期,轮虫密度较高,丰水期,轮虫密度较低.4个采样点轮虫年平均密度以天河采样点最高(1 260 ind./L),中大采样点次之(1 123 ind./L),黄埔采样点再次(737 ind./L),流花采样点最低(718 ind./L).径流量、盐度、温度是造成河口和湖泊轮虫密度以及种类组成区别的重要因素.研究结果表明轮虫在河流和湖泊生态系统中具有重要作用.     

东昌湖轮虫种群的初步研究

1999年4～5月期间,采用筛绢过滤法和拖网法,对聊城东昌湖三个主要湖区的轮虫进行了初步研究,共检出轮虫8种,平均生物数量为610个/L,优势种为壶状臂尾轮虫(Brachionus urceus)和萼花臂尾轮虫(Brachionus calyciflorus).     

上海滴水湖浮游动物研究初报

在2006年2月～2007年2月对滴水湖进行调查采样,研究了该湖泊中的浮游动物群落结构及其季节变化．通过调查共鉴定浮游动物39种：轮虫27种,桡足类10种,枝角类2种．优势种有中华窄腹剑水蚤（Limnoithona sinensis）、褶皱臂尾轮虫（Brachionusrotundiformis complex）、中型六腕轮虫（Hexarthra intermedia）、角突臂尾轮虫（Brachionus angularis）和疣毛轮虫（Synchaetasp．）,不同季节浮游动物优势种类不同．浮游动物生物量7月份最高,2月份最低．     

宁波高教园区人工河夏季轮虫及与水质关系

研究了宁波高教园区人工河2004-2005年夏季轮虫的种类组成、数量、生物量和多样性指数的水平变化和年间变化,并用轮虫污染指示种类和生物多样性指数评价人工河水质污染及水质营养状况.在两个夏季调查中,共发现轮虫35种,其中污染指示轮虫18种.根据平均密度,优势种分别为剪形臂尾轮虫(Brachionusforficula)、针簇多肢轮虫(Polyarthratrigla)和奇异巨腕轮虫(Pedaliamira),占轮虫总数量的54%.人工河中钱湖桥边轮虫的数量、生物量和多样性指数均高于横省桥边;2005年人工河轮虫的数量和生物量均显著低于2004年.高教园区人工河属于中污偏寡污、中度营养型水体.     

十种臂尾轮虫12S rDNA基因序列的PCR扩增及分析

通过对角突臂尾轮虫、尾突臂尾轮虫、裂足臂尾轮虫、剪形臂尾轮虫、方形臂尾轮虫、壶状臂尾轮虫、红臂尾轮虫、镰形臂尾轮虫、萼花臂尾轮虫和十指臂尾轮虫等十种臂尾轮虫和矩形龟甲轮虫的12S rDNA基因进行扩增和序列测序,结合Genbank中两种褶皱臂尾轮虫的125rDNA序列,使用MEGA软件构建这13种轮虫系统发生树(NJ树),探讨了12种臂尾轮虫之间的系统关系.结果表明:本研究所涉及的轮虫12S rDNA序列差异百分比均值为34.41%,可作为分子标记应用于轮虫属内种间系统关系研究;系统树支持将十指臂尾轮虫、裂足臂尾轮虫归属于臂尾轮属;壶状臂尾轮虫和红臂尾轮虫是两个独立的种.     

太原市河道轮虫群落结构特征及水质评价

调查了太原市河道三个不同营养状态水体的轮虫群落及理化因子,检测到轮虫73种,录属于18科29属,螺形龟甲轮虫(Keratella cochlearis)、曲腿龟甲轮虫(Keratella valga)、广布多肢轮虫(Polyarthra vulgaris)、萼花臂尾轮虫(Brachionus calyciflorus)、角突臂尾轮虫(Brachionus angularis)及长圆疣毛轮虫(Synchaeta oblonga)为优势种.应用污染指示种、EO指数及物种多样性指数方法,并结合综合营养状态指数对水质进行了初步评价,结果表明上兰段属于中营养类型,南内环段为轻度富营养,温南社段中度富营养,轮虫群落结构特征评价的水质状况结果与理化因子的评价基本一致.     

福建淡水轮虫新资料

记述了臂尾轮科淡水轮虫一种析种及二个国内新记录种：锚孔臂尾轮虫（新种）Ｂｒａｈｉｏｎｕｓ ａｎｃｈｏｒｐｏｒａ ｓｐ．ｎｏｖ腔龟纹轮虫（瓣记录）Ａｎｕｒａｅｏｐｓｉｓ ｃｏｅｌａｔａ及棘剌臂尾水轮虫（新记录）Ｅｐｉｐｈａｎｅｓ ｂｒａｃｈｉｏｎｕｓ ｓｐｉｎｏｓｕｓ。还将新种与其相近种：壶状臂尾轮虫Ｂ．ｕｒｃｅｕｓ。和褶皱臂尾轮虫Ｂ．ｐｌｉｃａｔｉｌｉｓ进行了比较，并提出讨论。     

基于浮游动物群落特征的渭河橡胶坝景观河流水质生物学评价

为了解城市景观河流浮游动物群落结构以及水生态环境状况，于2018年对渭河关中段4个城市景观河流开展季节性采样.共计鉴定出浮游动物78种，其中轮虫46种，枝角类和桡足类分别为14和18种.全年浮游动物总密度介于0.452～7.482×10³ ind./L,轮虫密度占总密度的83.51%.全年浮游动物总生物量介于0.207～6.834 mg/L,以枝角类、桡足类为主，占总生物量的74.05%.全年浮游动物优势种属17个，萼花臂尾轮虫（Brachionus calyciflorus）、蒲达臂尾轮虫（Branchionus budapestiensis）、针簇多肢轮虫（Polyarthra trigla）、矩形龟甲轮虫（Keratella quadrata）等优势度较高，优势种多为中污染或富营养水体的指示种.Shannon-Wiener多样性指数（H′）春、夏、秋、冬季均值为2.27,2.72,2.06,2.13;Margalef丰富度指数（d）均值分别为0.990,0.069,0.020,0.830;Pielou均匀度指数（J）均值分别为0.32,0.02,0.01,0...     

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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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.     

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。     

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