单片机系统中软件WATCHDOG的应用

结合系统程序设计针对８０９８单片机给出了两种软件ＷＡＴＣＨＤＯＧ的使用方法，对于片内没有软件ＷＡＴＣＨＤＯＧ系统的单片机（如８０３１）介绍了如何建立软件ＷＡＴＣＨＤＯＧ及兼职ＷＡＴＣＨＤＯＧ的使用方法。     

系统化的机械产品计算机辅助设计（SCAD）方法的研究

通过将系统化的工程设计方法与ＣＡＤ技术相结合，提出系统化的计算机辅助设计（ＳＣＡＤ）方法。并研究了ＳＣＡＤ所包含的四个阶段－计算机辅助产品规划（ＣＡＰＲＰ）、计算机辅助概念设计（ＣＡＣＤ）、计算机辅助具体化设计（ＣＡＥＤ）和计算机辅助详细设计（ＣＡＤＤ）的一些具体实施方案，形成了ＳＣＡＤ技术的基本理论框架。     

计算机辅助公差设计及与AUTOCAD的接口

本文提出了一种机械零件公差的计算机辅助设计、选用原理和方法，并提出了选用数据与ＡＵＴＯＣＡＤ软件包接口的方法．根据上述原理和方法，开发了常用零件的“计算机辅助公差设计软件包”，并编制了其与ＡＵＴＯＣＡＤ的接口软件。应用表明：原理正确，符合国家有关标准．使用方便，对推广机械ＣＡＤ有重要意义。     

含环成二烯基的丙烯酸衍生物的合成和表征

以丙烯酸（ＡＡ）和环戊二烯（ＣＰＤ）为起始原料，首先合成了丙烯酰氯（ＡＣ）和环戊二烯基乙醇（ＣＰＤＥ）两种中间体，通过酰氯与醇或活泼氢化合物之间典型的消除反应．合成了丙烯酸环戊二烯基乙酯（ＣＥＡ）和环戊二烯－丙烯酸加合物（ＣＰＤ－ＡＡ）．并对其结构进行了表征．     

机械制造中CAD／CAM软件的联合应用

以机械制造业中的计算机辅助设计软件ＡｕｔｏＣＡＤ和辅助制造软件ＳｍａｒｔＣＡＭ、ＭａｓｔｅｒＣＡＭ为例，研究了两种软件在联合应用过程中应注意的问题，提出技术处理方法．利用这些处理方法，实现了两种软件的联合应用．     

AutoCAD R13 中清角功能的实现

在总结机械、建筑ＣＡＤ工作实践的基础上，针对ＡｕｔｏＣＡＤ通用绘图软件，归纳提出了清角的图线处理功能，研究了清角功能的算法，讨论了ＡｕｔｏＣＡＤＲ１３中各种直线类图元的关系及其清角的处理方法。完善并丰富了ＡｕｔｏＣＡＤ实用绘图功能，提高了ＡｕｔｏＣＡＤ绘制工程图的效率。     

直接生成DWG图形文件的图形代真法

介绍了一种不经Ａｕｔｏ ＣＡＤ绘图软件，采用汇编语言，通过哑图直接生成ＤＷＧ图形文件的新方法。该方法在ＣＡＤ软件开发中有很大的应用价值。     

成套电器面板计算机辅助设计与制造系统

成套电器面板计算机辅助设计与制造系统ＪＤＰ－ＣＡＤＡＭ是一个ＣＡＤ与ＣＡＭ集成数控自动编程系统，在ＣＡＤ部分，利用人工神经网络，输入细表，可以实现面板的自动布置，并自动形成开孔图，在ＣＡＭ部分，读取面板开孔图后，系统自动选择加工刀具和确定加工路线，自动生成ＮＣ程序并用动画模拟的方法校核其正确性，文章在总体概括ＪＤＰ－ＣＡＤＡＭ系统的基础上，重点介绍了数控自动编程部分的功能及实现方法。     

全数字高清晰度电视（HDTV）传输方式—16QAM

本文概述了频道兼容Ｄｉｇｉｃｉｐｈｅｒ ＨＤＴＶ（ＣＣＤＣ ＨＤＴＶ）系统中采用的传输方式１６ＱＡＭ的调制与解调原理，同时对１６ＱＡＭ的两种不同实现方法－正交调幅法和ＱＰＳＫ迭加法作了比较，说明四相迭加法是较好的方案。     

基于特征约束的CAD技术研究

特征设计是当前解决ＣＡＤ／ＣＡＭ集成的重要方法之一。但目前特征的描述及特征建模的方法还不能解决ＣＡＤ／ＣＡＭ集成过程中提出的问题，这些问题包括特征库中特征类的简化、特征灵活性与变化性，设计特征映射成加工特征的困难等等。现提出一种特殊约束建模的方法，能较好地解决上述问题，并给出基于这种建模的ＣＡＤ系统的结构。     

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