树中珍品--羊奶果

羊奶果又名密花胡颓子、南胡颓子、藤胡颓子,云南西双版纳叫大果胡颓子,是胡颓子科胡颓子属多年生常绿攀缘植物,茎无刺,圆形,幼枝略扁,密被银白色鳞片;叶纸质,椭圆形,全缘,叶面幼时被银白色鳞片,干燥后深绿色,叶背密被鳞片,侧脉5～7对,两面均明显;叶柄淡黄色,长8～10mm.伞形短总状花序,小花银白色,花梗长约1mm;果实长椭圆形,长20～40mm,熟时红色,果梗粗短.     

四川省杜鹃属植物大数据的分析及园林推广优先应用种类的筛选

四川省是我国杜鹃属植物三大自然分布中心之一.为更好了解四川省杜鹃属植物概况,本研究构建了四川大学植物标本馆(SZ)杜鹃属植物标本信息数据库,并以此为基础,分别从种类、采集地、海拔等方面进行了统计和分析.结果表明,SZ有16077份杜鹃属植物腊叶标本,分别隶属于6个亚属14个组29个亚组260种(包含11亚种、29变种),其中有85种3亚种9变种为四川特有.模式标本158份,隶属于2亚属17种;新增四川省杜鹃属植物地理分布新记录16种.四川省15个市(州)75个县有杜鹃属植物分布,以凉山州、甘孜州、阿坝州、雅安市和乐山市分布种类最多,利用最大熵模型(MaxEnt)并结合园林应用价值筛选出四川省园林推广6个优先应用种类:黄花杜鹃、亮叶杜鹃、绒毛杜鹃、秀雅杜鹃、腋花杜鹃、凹叶杜鹃.     

植物标本馆纵横

植物标本馆是运用各种技术将植物标本进行分类保管的专门馆室.植物标本包括腊叶标本(干标本)、浸制标本、实物标本、化石标本、玻璃(制片)标本等.植物标本馆是一个综合信息库,每一份标本均含有大量信息,包括植物本身的特征及附属     

陕北菊科植物一种新纪录

报道了产于陕西甘泉县的菊科(Compositae),蓍属(Achillea L)新纪录植物齿叶蓍Achillea acuminata(Ledeb.)Sch.-Bip.。此植物是陕北地区首次发现,引证标本现存于陕西省延安大学植物标本馆。     

味美可口的胡颓子

胡颓子(Elaeagnus pungens)为常绿灌木,茎上有刺,小枝褐锈色,叶互生,椭圆形或长椭圆形,长4～6厘米,正面绿色,背面银白色或灰白色。花银白色,管状下垂,簇生于叶腋;果实椭圆形,长约1.5厘米,成熟时红色。10～11月开花结果,3～4月成熟。胡颓子通常生长于山地杂木林内或向阳沟谷旁,有时生     

铅胁迫对胡颓子幼苗生理特性的影响

以0、100、500、1000、2000mg/L的Pb(NO3)2溶液处理胡颓子幼苗,研究铅对胡颓子幼苗的生理生化效应.结果表明,叶片叶绿素含量下降,SOD活性下降,POD活性先上升后下降.表明高浓度铅胁迫导致胡颓子幼苗体内保护酶活性受到抑制,影响胡颓子幼苗的生长.     

我国独有的翅果油树

翅果油树(Elaegnus mollis)不仅是我国独有的树种,也是山西特有种,列为国家二级重点保护植物.翅果油树是一种稀有的优良油料树种,我国已有二百多年的栽培历史,但予以科学定名还是二十多年前的事情.1968年4月,李大章同志在山西省乡宁县首先发现,后经郑万钧先生鉴定,定名为"翅果油树",并列入《中国树木志》.翅果油树属胡颓子科,胡颓子属,是一种落叶亚乔木,高可达11米,胸径可达1米.其别名有泽绿旦、车勾子和柴胡等.翅     

番荔枝科糠秕鳞杜氏木群及其近缘种的修订(Ⅲ)——种的描述、分类定界及亲缘关系(英文)

本文是第一作者在荷兰鸟支大学系统植物学研究所进修期间完成的番茄枝科杜氏木属(Duguetia)中糠秕鳞杜氏木群及近缘种专著修订的第三部分.文中给出了属于糠秕鳞杜氏木群的下列四种:鳞斑杜氏木(D.lepidota)、芳香杜氏木(D.odorata)、光叶杜氏木(D.glabriuscula)、及披针叶杜氏木(D.lanceolata)的详尽形态描述、分类定界、地理分布、地方名、应用价值及相互亲缘关系.小叶披针叶杜氏木(D.lanceolata)var.parvifolia)被认为是披针叶杜氏木的极端变异,其分类等级不能被承认,芳香杜氏木不象R.E.Fries(1934.1959)认为那样与糠秕鳞杜氏木有直接亲缘,而是与鳞斑杜氏木亲缘关系极近.     

沙枣中铜锌铁钙金属元素分析方法研究——原子吸收光谱法

1 前言沙枣树(Elacagnus angustifolial)是胡颓子科胡颓子属的一种落叶灌木或小乔木。具有抗旱、耐寒、抗碱、抗风沙之特点,广泛分部于亚、欧、北美和我国西北、华北、东北及中原、西南等地。     

陕西富县一种植物新纪录

报道了产于陕西富县的报春花科Primulaceae报春花属Primula新纪录植物散布报春Primula conspersa Balf.f.et Purdom;并首次对该植物种子进行了形态描述。引证花期标本现存陕西子午岭国家级自然保护区标本馆(陕西富县);果期标本现存于延安大学生命科学学院标本室。     

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