一个实用的地图着色算法

给出一种计算机实现地图四色着色的算法,并以Ｐａｓｃａｌ语言编制了程序．该程序稍作改动,即可成为分块图形实现四色着色的通用程序．     

终周期双峰映射拓扑熵的计算

利用符号动力学的揉理论,讨论双峰映射拓扑熵的计算．对于具有重要意义的终周期揉序列对,给出了决定其拓扑熵的揉行列式的解析表达式．     

关于凸过程的有界性和可测性*

设Ｘ是实序列完备的局部凸拓扑向量空间,Ｙ是拓扑向量空间．设Ｔ：Ｘ→２Ｙ是凸过程（ＣｏｎｖｅｘＰｒｏｃｅｓｓ）,且它的定义域Ｄｏｍ（Ｔ）是Ｘ的闭子空间．本文证明了若对Ｘ上的每一可分子空间Ｍ,Ｔ在Ｍ上的限制是绝对可测的,则Ｔ是有界的．     

构造 TCM 好码的动态规划算法

提出了一种构造ＴＣＭ好码的动态规划算法（ＤＰ）．ＤＰ算法在建立了ＴＣＭ好码规则、编码器及信号网格图间的对应关系的基础上,采用动态规划算法进行寻优,从而获得ＴＣＭ好码．与常规ＴＣＭ好码构造算法［４,５］相比,本算法在精度、计算复杂度和灵活性上均有所改进．     

THE FINITE AUTOMATA OF EVENTUALLY PERIODIC UNIMODAL MAPS ON THE INTERVAL

For unimodal maps on the interval we prove that, if the kneading sequences (KS) are eventually periodic, then their formal languages are regular ones. The finite automata for such languages are constructed. Comparing with the languages generated by periodic KS, it is shown that the languages here are not finite complement languages.     

GPS技术在水利工程中的应用

使用GPS技术进行测量工作,速度快精度高,具有传统测量方法无法比拟的优点,该项技术在安徽省长江防汛、河道治理、水资源合理开发利用过程中发挥着重要作用。     

ArcGIS在武夷山保护区林业有害生物分布电子地图制作中的应用

本文详细介绍了利用ArcG IS 9.0制作林业有害生物分布电子地图的方法,包括创建要素图层,建立连接,数据符号化以及图层标注。     

一类特殊的LF-网空间

本文研究了LF-网空间和它的几个子空间类,考虑了LF-k-网空间与几类广义度量化空间的关系,并且给出了LF-k-网空间的一个等价条件.     

磁浮轴承转子系统的稳定性研究

针对非线性磁浮轴承转子系统的具体特点，用数值积分和庞加莱映射方法对刚性磁浮轴承转子系统进行稳定性研究，得到了系统在某些参数域中的时域波形、频谱图、相图、轴心轨迹以及庞加莱映射图，并给出了系统产生混沌运动诱发失稳的参数域。为更好控制磁浮轴承转子系统运行状态提供理论参考。     

Pattern formation in Rayleigh-Bénard convection: Numerical simulation with a coupled-map-lattice model

The various patterns formed in Rayleigh-Bénard convection under different conditions are numerically simulated with a coupled-map-lattice model. In the case of a lower aspect ratio (L/d=5), the simulations vividly depicted the main features of the transition process from a laminar state to a soft turbulence and then to a hard turbulence. In this case, the cellular structure in a horizontal section is also reproduced. In the case of a larger aspect ratio (L/d=30), the simulations successfully reproduced the spiral-defect chaos and target chaos in the initial stage of the pattern evolution which were recently found in experiments. In this case, for a fluid ofPr=1, it is verified in simulations that both the ideal straight rolls and spiral-defect chaos are stable attractors in the same parameter regime, and that the initial condition is a decisive factor for which one of the two is formed. In the same case, for a fluid ofPr=4, the target patterns are dominant instead of the spirals, the sizes and distributions of the target are also notably dependent on the initial condition.