CAI中学习测试问题折解决方法

从教学基本规律和要求出发，提出了ＣＡＩ软件中必须解决的学习测试问题和解决该问题的具体要求。     

一种CAI学习模型及其超文本课件

在讨论了ＣＡＩ学习理论的基础上，给出了一个ＣＡＩ认知学习模型，详细介绍了为实现模型而设计的一种超文本课件的组织。此模型的ＣＡＩ系统可以为教师一个方便的教学设计环境，有助于解决现有ＣＡＩ软件教学设计不足的问题。     

智能多媒体CAI开发环境

计算机辅助教育软件的推广和应用上出现了一些困难。本文分析和论述开发和应用ＣＡＩ软件中遇到的问题和原因，指出计算机辅助教育（ＣＡＩ）必须智能化、多媒体化、和认知化，ＣＡＩ的开发和应用迫切需要一个高性能的开发平台。从而提出了一个智能多媒体ＣＡＩ开发环境的体系结构和设计方案，并以作者在此基础上正在设计和开发的智能多媒体ＣＡＩ开发环境Ｈｙｐｅｒ Ｔｒａｉｎ为例作了具体论述。ＨｙｐｅｒＴｒａｉｎ是一个完整的     

电子电路CAI系统的设计与优化

研究并实现了一种电子电路ＣＡＩ（计算机辅助教学）教学系统。给出了该系统的树型结构简图，并通过一个读写存储器功能演示电路和软件程序的实例，阐述了ＣＡＩ系统树型结构模块的具体实现。文中给出的ＣＡＩ教学信息反馈的数学模型、ＣＡＩ教学系统优化流程和教学信息理论的测定方法，对当前ＣＡＩ教学系统的研究设计具有普遍的指导意义     

《工程制图》多媒体CAI在微机网络上的实现

《工程制图》多媒体ＣＡＩ课件需要制作大量的三维真彩色动画，由于这种动画的数据量很大，因此，制作工程多媒体ＣＡＩ课件在难度上比一般的多媒体ＣＡＩ大，这类课件的研制在我国仍处在初级阶段，目前这类软件都不能在微机网络上运行，从而影响了工程制图ＣＡＩ在课堂上的使用效果，我们采用Ｖｉｓｕａｌ Ｂａｓｉｃ描述性语言 网上实现了资源共享，解决了实验室中几十个终端学生学习工程制图多媒体课件的问题，这将会降低实验室     

计算机辅助教学（CAI）的教学功能

从分析教学系统出发着重探讨了学习的机制，并据此分析阐述了ＣＡＩ在教学系统中的地位和作用，ＣＡＩ软件编制的原则，指出编写和应用ＣＡＩ的必要性，最后对ＣＡＩ的应用情况作一讨论。     

CAI课件的教学设计

以认知学习理论为基础，结合ＣＡＩ的特点，提出了一ＣＡＩ课件的教学设计模型，该模型描述了在ＣＡＩ课件设计中的目标分析，内容分析和课程组织，最后对ＣＡＩ课件教学设计的做了简要介绍。     

多媒体《工程制图》CAI中的逻辑艺术

该文依据在计算机辅助教学（ＣＡＩ）课件制作中的经验，指出了ＣＡＩ系统是一种计算机系统，更是一种教学系统，具有教学功能的课件，应能体现一定的教学理论，教学策略，学习理论和ＣＡＩ设计理论，通过对人的思维特点和认真思考及全面训练和培养人的能力出发，以“投影面平行线”及“投影面垂直线”的投影特性的讲解为例，讲述了归纳和演绎的逻辑罹 具体运用。     

CAD/CAM集成技术研究

从ＣＩＭＳ出发，探讨了ＣＡＤ、ＣＡＭ集成的目的、途径以及集成需要解决的关键技术问题，阐述了这一研究领域的最新发展情况。     

开发大学物理CAI软件的主要原则

从教学功能的角度对ＣＡＩ软件进行了分类，对指导ＣＡＩ软件开发和应用的三种学习理论进行了讨论并提出了开发大学物理ＣＡＩ软件应遵循的主要原则。     

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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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.     

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