C＋＋运算符重载教学和编程中易被忽视的问题

对运算符重载教学和编程中常见的、易被忽视的问题进行了深入探讨和分析，并给出了有效的解决方法。对运算符重载时如何考虑用户使用习惯、使用的方便性和继承性也作了阐述。     

对C＋＋几个运算符重载设计的研究

从几个运算符重载的设计出发,对设计的主要方法进行了讨论。澄清了运算符重载设计中对一些问题的模糊认识,对教学有借鉴和参考价值。     

基于.NET的大整数类设计与实现

在研究.NET框架的内核、CLS规范和运算符重载的实质功能的基础上,运用面向对象技术,提出基于.NET的具有精确运算、支持运算符计算和跨语言调用能力的大整数类BigInteger的设计方案,并用C#语言实现.     

C语言自增自减运算符的解析与应用

自增自减是C语言运算符里比较有特色的运算符,也是在使用时最容易出错的运算符.结合教学和使用经验对Turbo C 2.0中的自增自减运算符进行研究,根据自增自减运算符的特点和不同使用形式,剖析自增自减运算符的使用规则,总结各种解题技巧和使用方法,以便更好地帮助初学者学习和使用自增自减运算符.     

C++中verylong的数据抽象分析和扩展

在C 中扩展整型类型,使该种类型定义的数据在操作上不受数据范围的限制.采用的原理是面向对象技术,用字符串存放数据,运算符重载来提供运算,并将数据和操作进行封装,以标准的接口提供服务.最终用户可以象使用基本类型一样的使用它,同时在计算机代数中广泛使用.     

讲解Turbo C程序中++和--运算符的若干方法

C程序设计语言中提供了两个特有的运算符 ,即自增运算符 ( ++ )和自减运算符 ( - - ) ,用于对变量加 1、减 1正确理解并使用这两个运算符对于编写C程序是很重要的 .本文介绍了讲解分析TurboC程序中的自增运算符 ++和自减运算符 - -的 3种方法 ,即语句分解法、表达式独立求值法和变量存储示意图法     

对C语言教学中学生易出错的运算符及表达式的解析

C语言功能强大,运算符丰富,表达式使用灵活,在教学过程中,学生对有些运算符及表达式的使用感到困惑,出错率比较高,进而导致程序无法得出正确的结果.本文就运算符及表达式易出错的问题进行了较全面的归纳与分析.     

基于容器的面向对象技术的多态性实现及应用

多态性是面向对象技术的重要特性之一,C++语言支持静态多态性和动态多态性.静态多态性主要通过函数重载和运算符重载来实现,动态多态性主要通过虚函数和动态联编来实现.多态性使程序设计更加灵活、易维护和易扩展.介绍了动态多态性在C++语言中的实现机制,提出基于容器的动态多态性实现技术,结合VC++6.0中绘图软件开发实例,描述基于容器的绘图过程及动态多态性应用.     

C/C++语言中“&”运算符的用法

"&"运算符是C/C++语言中使用比较灵活的运算符之一,根据使用功能和在上下文中的含义详细阐述其用法.     

灵活应用C语言中的++/——运算符

在C语言中,经常使用 /--运算符,它使用灵活,不容易掌握.本文结合实例归纳了 /--运算符在解题过程中常碰到的七个方面的应用,是对教材的补充,既有利于教师的教学,也有利于同学的自学.     

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.     

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.     

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.