海南岛林区发展棕榈科藤类植物种植业的研究

笔者对海南岛的棕榈科藤类植物野生资源及其开发利用进行了调查研究。海南岛的棕榈科藤类植物共有3属12种。这些植物资源中有6种是海南岛有发展前途的人工种植的藤种。本岛林区(系指天然林区)是天然林的分布中心,也是棕榈科藤类植物的主要产地,适于多种棕榈科藤类植物的繁衍和人工种植,发展人工种藤业具有得天独厚的自然条件,是发展棕榈科藤类植物种植业的理想基地。     

海南岛的棕榈科藤本植物资源

笔者对海南岛的棕榈科藤本植物资源进行了调查。海南岛分布有3属12种棕榈科藤本植物。这些植物资源中有5种是海南岛有发展前途的人工种植的藤种;有4种是海南岛的特有种。为有效地保护和发展海南岛的棕榈科藤本植物资源提供了科学的依据。     

夏威夷椰子的引种栽培

棕榈科植物以其特有的热带风情，深受人们的喜爱，随着经济的发展，生产水平的提高，环境意识的增强，我国许多大、中城市纷纷采用棕榈科植物进行环境的绿化、美化。甚至不远万里从澳大利亚及东南亚引进各种棕榈植物。由于地理、气候条件的限制，目前国内棕榈科植物引种驯化和生产基地主要在广东。福建虽然地理及气候条件也能适合部份棕榈科植物的生长，但由于缺乏对一些棕榈科新品种的认识及种植经验。我省非但不能对外提供棕榈科植物，就是本省室内外绿化及房地产项目中的景观绿化苗木，均要由广东引进。     

海南山地雨林访棕榈

棕榈科植物共有约2600种，主要分布在热带、亚热带地区，其中既有高耸人云的乔木，也不乏身材俊秀的灌木．当然更少不了身形纤细的藤本。其实．人们对棕榈科植物并不陌生．很多有特色的棕榈科成员早已被当做观赏植物在世界各地栽种，如常见的散尾葵等；还有一些种类具有很高的经济价值，如油棕和椰子。     

棕榈科植物在海口市园林绿化上应用的探讨

针对棕榈科植物在海口市园林绿化上应用的现状，结合其自然地理条件及棕榈科植物应用于园林绿化的优势，对海口市今后发展种植棕相科植物的前景进行了初步的探讨，并提出了以种类丰富的棕榈科植物作为海口市园林绿化的基调树种，营造富有热带风光的滨海城市．     

董棕

正董棕是2000多种棕榈科植物中的一员,在我国应用十分广泛,除了是漂亮的景观绿化植物外,还可作为粮食食用。董棕可制成很多防潮防雨的生活用品,甚至有药用功效。近些年,随着人们的建设开发,董棕的数量正在逐渐减少。在"一带一路"沿线的国家里,有的国家把棕榈科植物印在了国旗上,如东南亚的文莱,棕榈植物对于热带、亚热带地区人民的重要性可见一斑。     

椰风蕉雨总关情——棕榈趣谈

棕榈科植物是世界上最重要的园林观赏植物和经济树种之一,其树形优美独特、婀娜多姿,具有浓郁的热带韵味。一提到棕榈人们就会想起清沏碧蓝的海水、明媚的阳光、金黄的沙滩、净洁清新的空气,海天一色、椰子、海枣成群的海滨美景,人们常用“椰风蕉雨”来形容南国风情,足见棕榈科植物在热带风光中举足轻重的重要地位。古老的家族成员根据古植物学研究记载,棕榈科古植物大化石及化石孢粉最早见于距今7000万年前的白垩纪,当被子植物出现于地球上不久就有了棕裥科植物,棕榈科的祖先与被称之为“活化石”的苏铁类的祖先     

棕榈科植物探秘

棕榈科植物大约有210属、2800种,分布于热带、亚热带地区,以热带亚洲和美洲为主。“满腹经纶”的贝叶棕贝叶棕有多种名称,如贝多罗、树头棕、贝多罗叶、行李叶椰子树等等,属于棕榈科贝叶棕属。     

棕榈科植物绿化施工养护要点

近几年棕榈科植物以其独特的形态和亚热带风韵,成为世界上众多城市十分喜爱的植物,同时在园林景观中得到了广泛应用,但也引发一系列问题。本文就结合实践,在了解棕榈科植物基本特点的基础上,探讨棕榈植物在绿化施工及养护中的技术要点。     

棕榈植物的特点及在佛山园林上的应用

棕榈科植物是华南地区重要的园林植物资源，全科约210属3000余种，在园林应用方面具有多种用途，尤其是景观设计方面。本文根据棕榈植物的特点和造景功能，对在佛山市恰当运用棕榈科植物，形成地方特色作一探讨。     

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…     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.