重庆市渝北区耕地整理潜力研究

通过划分潜力评价单元、构建评价指标体系、指标值标准化处理，加权求和得到渝北区耕地整理潜力综合指数Fi及潜力分区，提出耕地整理的促进措施，以期有助于实现渝北区耕地保护和耕地总量动态平衡．     

延吉市市地整理潜力宏观评价研究

在探讨市地整理潜力的基本理论问题的基础上,从宏观层面对延吉市城区土地进行潜力评价,对延吉市城区土地利用现状进行了分析,通过确定评价技术路线、建立指标体系、确立评价方法、构建潜力等级体系、计算可整理潜力值5个步骤对延吉市市地整理潜力进行综合评价,并给出相应的整理建议.     

基于PATTERN的土地整理潜力评价

土地整理潜力评价是编制土地整理专项规划的依据,是科学划定土地整理区的基础工作。本文将土地整理潜力划分为本底潜力和环境潜力,据此建立土地整理潜力评价指标体系,确定基于关联树(PATTERN)法的土地整理潜力评价方法,并对湖南省临湘市土地整理潜力进行区域分级,从而为该市土地整理专项规划的编制提供参考。     

模糊数学在土地开发整理新增耕地质量评价中的应用

主要从土地开发整理新增耕地质量验收的角度出发，应用模糊数学综合评判法对土地开发整理新增耕地质量评价做了探索性研究，通过对陕西省卤泊滩土地开发项目新增耕地质量的应用分析，结果表明，该方法的评价结果与其他方法的实际情况是一致的，且步骤严谨简便，易于操作。     

土地开发整理项目中耕地自然质量评价研究

阐明了土地开发整理的内涵、目标,通过对土地开发整理项目管理中耕地自然质量影响因素控制标准和耕地自然质量评价标准的分析,提出土地开发整理后耕地自然质量评价方法。     

山地丘陵区农村居民点整治潜力测算——以陕西省旬阳县为例

基于户均建设用地标准法测算陕西省旬阳县农村居民点土地整理的理论潜力,选取自然、经济、社会因素构建修正指标体系,利用修正系数计算耕地潜力和当前可开发潜力,继而确定农村居民点整理分区。结果表明:旬阳县土地整理理论潜力总计225.414hm~2;各乡镇耕地潜力修正系数为0.267~0.810,耕地潜力总计124.168hm~2;可开发潜力修正系数为0.305~0.810,可开发潜力总计73.896hm~2。对整理潜力进行分区,其中一级潜力区有4个,可开发潜力40.988hm~2;二级潜力区有4个,可开发潜力15.49hm~2;其余镇属于三级潜力区,可开发潜力17.419hm~2。农村居民点土地整治潜力受自然因素影响较大,社会、经济因素次之。     

耕地整理潜力评价--以三峡重庆库区为例

耕地整理潜力评价作为耕地整理的一项基础工作,目前缺乏统一的评价指标体系。从三峡重庆库区的实际出发,依据耕地整理目标和潜力评价的原则,指出了评价工作应从多指标综合考虑,提出了耕地潜力评价体系应包括增加耕地系数、耕地产出提高率、投入产出比、林地面积比重提高率等方面,以期在评价工作中做到社会效益、经济效益和生态环境效益的统一。     

川西北高山高原区土地开发整理补充耕地质量等级评价——以康定县新都桥镇土地整理项目为例

土地开发整理补充耕地质量等级是实现耕地占补平衡的基础.通过选择川西北高山高原区典型土地整理项目,运用层次分析法确定了补充耕地质量评价指标体系,并对补充耕地质量等级进行了模糊综合评价.结果表明,项目区补充耕地普遍属于＂良好＂等级,但不同坡度级之间耕地质量有明显差异,土地质量随坡度的增大而降低.     

模糊数学在土地开发整理新增耕地质量评价中的应用

主要从土地开发整理新增耕地质量验收的角度出发,应用模糊数学综合评判法对土地开发整理新增耕地质量评价做了探索性研究,通过对陕西省卤泊滩土地开发项目新增耕地质量的应用分析,结果表明,该方法的评价结果与其他方法的实际情况是一致的,且步骤严谨简便,易于操作。     

综合评价指标体系和评价方法

综合评价指标体系建立及评价方法的选择是综合评价工作的中心环节。在前人研究成果基础上，提出了一套较为完整、实用的指标体系的建立方法，并提出了评价方法的选择原则．指出了当前综合评价工作中尚待研究的问题。     

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