网上教学支持系统的设计与研究

介绍了网上教学支持系统的主要功能模块,提出了网上教学支持系统实施过程中网上考试子系统、网上实验管理智能化子系统、网上作业子系统和网上答疑子系统等需要考虑的几个关键问题.     

飞行签派员执照计算机化考核网络系统设计

对民航飞行签派员执照考试计算机化网络系统的结构和功能设计进行了研究。该系统采用资源管理层、应用服务器层和表示层3层体系结构，网络通信采用TCP／IP网络协议，应用层通信协议采用自己定义的二进制数据包协议，程序设计采用Delphi语言，使用ClOD。该系统框架包括考试管理子系统、考试服务器子系统、考生考试子系统和考生自测子系统。     

基于WEB的考试模型探讨

基于Web的考试系统是考试的发展方向，是远程教育的一个重要组成部分，它采用B/S模型，分析了基于Web系统的考试模型及功能，研究了考试系统实现的关键技术，并在具体系统中做了实现。     

基于网络环境下测试问题的研究

介绍几种考试方式,重点研究分析了网络无纸化考试系统和各个子系统,以及子系统的相应结构和应该实现的功能,介绍了网络无纸化考试系统的主要考试流程和各个流程中相应问题及其解决方法。通过这种考核方式可以更好的促进学生的学习。     

基于Web的计算机考试系统设计与实现

文章介绍了一种基于Web方式的计算机上机考试系统,由考试前端、题库管理和阅卷存档子系统等部分组成,主观性试题与客观性试题可以灵活组合.并详细介绍了系统的功能结构、抽题模型、安全机制及存档试卷生成技术.     

基于Web在线考试系统的设计与研究

介绍了基于Web在线考试系统各个子系统的功能与组成，论述了ASP与ADO结合访问数据库技术在基于Web网上考试系统的应用以及利用ASP实现的系统功能。     

金工实习在线考试系统的设计

简述利用ASP技术开发了金工实习理论考试试题库与在线考试系统。设计的考试系统功能比较全面，基本满足网上考试系统中的考生参加考试所需要的条件。本系统能够与数据库相连接，网页能够动态显示数据库中的内容，学生考试子系统具有良好的交互性。     

飞行签派员执照计算机化考核网络系统设计

对民航飞行签派员执照考试计算机化网络系统的结构和功能设计进行了研究。该系统采用资源管理层、应用服务器层和表示层3层体系结构,网络通信采用TCP/IP网络协议,应用层通信协议采用自己定义的二进制数据包协议,程序设计采用Delphi语言,使用OOD。该系统框架包括考试管理子系统、考试服务器子系统、考生考试子系统和考生自测子系统。     

基于Web的网络辅助教学系统的设计与实现

基于Web的网络辅助教学系统是基于B/S模式开发的典型的管理信息系统,它使用方便、操作简单,效率很高。系统主要包括在线学习和在线考试两个子系统,教师可以通过在线学习子系统轻松实现网上教学,学生也可以自由选择学习内容;在线考试子系统真正实现了无纸化出卷、考试以及阅卷的全过程,大大地减轻了教师出卷、阅卷的负担。     

拓扑系统的子系统

给出了拓扑系统的子系统、开子系统与闭子系统的定义.证明了在拓扑系统范畴中，拓扑系统的任意子系统都是正则单子对象.最后证明了一个拓扑系统D的全部子系统所构成的集合S(D)在包含序下是一个完备的Heyting代数.     

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).     

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.     

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.