栓皮栎种群的年龄动态与稳定性研究

对河南省内不同干扰程度下栓皮栎种群的年龄动态进行分析，结果表明较大干扰下其幼龄个体数量多，但死亡率较高，为增长型种群；而干扰较小时相反。     

朱鹮的环志情况及其生命表的分析研究

采用环志的方法，对朱野外种群进行了６年研究，编制了生命表；并对其繁殖地点变动、繁殖情况及各年龄组的存活情况等现状做了分析，发现洋县朱种群中，当年幼鸟死亡率比较高。增加种群数量的关键是保护１龄幼鸟。     

紫金山南麓枫香种群结构与动态特征

【目的】明晰自然演替下枫香(Liquidambar formosana)种群的数量动态特征，为南京紫金山地区森林的可持续经营提供参考。【方法】以南京紫金山南麓受人为干扰较小的固定样地中枫香种群为研究对象，记录样地内所有枫香个体的胸径、树高、冠幅等指标；根据调查样地内枫香个体胸径的大小，划分为9个径级(以0～7.5 cm径阶为径级Ⅰ,后每间隔5 cm划分径级直至径级Ⅸ),用径级来对应种群个体的龄级，绘制枫香种群年龄结构图，并用结构动态指数定量描述种群数量动态。通过编制植物种群静态生命表，绘制种群存活率、死亡率和消失率曲线，利用生存分析函数和线性平稳时间序列对该种群的结构特征现状及未来变化趋势进行分析和预测。【结果】(1)枫香种群个体年龄结构为“金字塔”型，在干扰下种群整体的龄级结构数量变化指数为0.02,表明种群个体数量在当前演替阶段能够维持正增长。(2)种群存活曲线趋于Deevey-Ⅰ型，种群个体生存率逐渐下降，死亡率、消失率、累积死亡率和危险率总体上逐渐上升，死亡密度则趋于稳定。(3)时间序列模型的预测结果表明枫香种群能够在未来较长的演替时间内仍呈增长趋势。(4)枫香树在胸径达到≥3...     

环志朱Huan生命表及繁殖情况的分析研究

在１９８７￣１９９７年的１１年里，采用鸟类环志的方法研究了野生朱Ｈｕａｎ的存活和死亡状况编制了动态生命表；并对其繁殖地，繁殖情况及年龄组的存活数量等做了分析，发现洋县野生朱Ｈｕａｎ种群中，当年幼鸟死亡率比较高，增加种群数量的关键是保护当年的幼鸟。     

朱Huan的环志情况及其生命表的分析研究

采用环志的方法，对朱Ｈｕａｎ野外种群进行了６年研究，编制了生命表；并对其繁殖地点变动、繁殖情况及各年龄组的存活情况等现状做了分析，发现洋县朱Ｈｕａｎ种群中，当年幼鸟死亡率比较高。增加种群数量的关键是保护１龄幼鸟。     

斑苦竹无性系种群的数量统计

应用生命表和生存曲线对缙云山斑苦竹无性系种群的数量进行统计分析，结果表明，①斑苦竹竹笋－幼竹无性系种群的生存曲线介于Ｂ型与Ｃ型之间，是一条较为平缓的凹形曲线，其死亡率为４０％，②斑苦竹无性系种群的年龄结构比较稳定，但已表现出轻度的衰退迹象。③生存曲线呈波状曲折的Ｃ型，各龄级竹子构件的死亡率不同，幼龄和老龄竹死亡率较中龄竹子大．     

冬夜赴辽运麋鹿

“何日相将去，千山麋鹿群。”2012年初，一批麋鹿被输出到千山国家鹿类辽阳马家庄呈龙鹿业基地（下面简称千山基地），成为再现“千山麋鹿群”意境的希望之种。这一工作的完成标志着一个新的麋鹿迁地种群的建立及辽河平原麋鹿种群恢复的开始。     

四川冶勒自然保护区垂枝香柏年龄结构研究

调查分析了四川省冶勒自然保护区内垂枝香柏的年龄结构.编制了静态生命表；绘制了存活曲线、死亡率曲线和消失率曲线；并探讨了垂枝香柏的更新.结果表明：①该树种平均年龄较大，约为277年.②存活曲线处于Deevey-Ⅱ型和Deevey-Ⅲ型之间，死亡率与消失率变化趋势一致.种群生存率呈单调下降趋势，生存率下降趋势前期相对稳定，中期逐渐增大，后期又趋向于稳定，说明垂枝香柏种群相对稳定，并有一定的更新能力.③保护区内垂枝香柏整个生长期中，200年以前，死亡率变化相对平缓，200年以后，死亡率急剧上升，在320年～44     

蝉联王位的野生麋鹿

江苏大丰麋鹿国家级自然保护区(后面简称:大丰麋鹿)是国际重要湿地,地处亚洲东方、太平洋西岸美丽的黄海滩涂。在这广袤无垠的湿地上生活着近1500多种野生动植物,麋鹿家族就生活在这片物种丰富、气候适宜的土地上。1986年从英国回归的39头麋鹿已增长到现在的1618头。目前,这里是全球面积最大、麋鹿种群数量最多并建立了最大麋鹿基因库的保护区。     

消息

2010年7月20日，首届“中国麋鹿保护奖”新闻发布会在国家林业局隆重召开。2010年是麋鹿回归中国25周年。江苏大丰麋鹿国家级自然保护区遵循“拯救、保护、科研、发展”的科学定位，使麇鹿种群由当年回归时的39头发展成目前的1618头，建立了世界上最大的糜鹿种群。     

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