应用分形几何学与小波理论对成像光谱数据进行地物识别的模型研究

以地物的混合光谱曲线为主要的研究目标，利用小波变换对混合的光谱曲线进行分解，将混合地物甚至地物内部组成成分的光谱特性曲线分解出来；根据已知的标准光谱特征曲线的自相似性指标，利用分形几何学方法将分解出来的不同光谱特性的曲线进行自相似性指标测量，以实现地物或者地物内部组成成分的识别。将分形几何学和小波变换理论有机地结合起来，为利用成像光谱数据进行地物识别，尤其是解决混合光谱的地物识别提供了一个值得进一步研究的方法。     

基于移位的递归子分割方法

自然景观的计算机三维模拟图形学研究的重要领域之一。本文在分析比较几种自然景观模拟方法之后，提出了一种模拟山水景观的基于移位的递归子分割方法。该方法不仅可以进行景观特征的局部控制，而且克服 景观模拟中的“折痕问题”，我们已用该方法在ＳＧＩＩＲＩＳ４Ｄ／２５图形工作站上实现了山水的三维模拟，得到了满意的效果。     

池塘对附近变电站接地电阻影响的分析

基于矩量法和边界元法分析了高阻地区的池塘对附近变电站接地网接地电阻的影响。结果表明:通常该影响较小,而利用池塘外引接地网则可有效降低接地电阻且外引接地体垂直于变电站一侧的岸边时效果较好。     

利用分形条件模拟和流线模型预测剩余油气饱和度分布

预测剩余油气饱和度分布是高含水期油田研究的重要内容,也是评价二次采油或三次采油方案的重要依据。认为预测剩余油气饱和度分布的有效方法是:首先充分利用井点测试资料,采用先进的随机建模技术进行精细油藏描述,建立精细的多种可能的地质模型;然后对多种可能的地质模型进行精细的油藏模拟,并将模拟结果与实际观测资料进行比较,挑选出理想的地质模型;最后利用优选的地质模型通过水驱油流线模型数值模拟来预测剩余油气饱和度分布。应用实例表明,该方法在满足精度的条件下,运算速度明显加快,具有广阔的应用前景。     

一种分形域基于内容的图像检索方法

基于内容的图像检索是多媒体、网络通信及计算机等应用研究领域的一项关键技术。该文提出了一种在分形压缩域直接进行基于内容的图像检索方法。该方法不需要对查询图像进行分形变换，因此可以提高检索速度，降低检索复杂度。仿真结果表明，使用该文提出的方法，能够有效地进行分形域基于内容的图像检索，比较大幅度地降低了检索时间，优于试验中其他3种方法。     

Effect of cooling rate on the structure and mechanical properties of milk fat and lard

The mechanical and thermal properties of a fat crystal network are determined by factors such as chemical composition, solid fat content (SFC), and crystal habit (polymorphism and microstructure). Processing conditions affect the crystallization of fats, thus having an effect on their functional properties. The effects of cooling rate on the macroscopic properties of a fat crystal network were studied by crystallizing anhydrous milk fat (AMF) and lard either rapidly (5 °C/min, Newtonian cooling) or slowly (0.1 °C/min, stepwise cooling). AMF crystallized rapidly was harder than AMF crystallized slowly and had a higher SFC. Moreover, its solid state was in a more metastable polymorphic form. Upon slow crystallization, AMF had a lower SFC and its solid state was in a more stable polymorphic form. AMF crystallized under fast cooling yielded a higher Avrami constant (k), and a lower Avrami exponent (n) than AMF crystallized under slow cooling. The microstructure was also different between the two treatments. When crystallized rapidly, crystallites were numerous and small, while a smaller number of larger crystallites were observed when crystallized slowly. Similar results were observed for lard crystallized under the same conditions. The mechanical properties of both AMF and lard, expressed as hardness, depend on a variety of factors, which include the SFC, polymorphism of the solid state as well as the microstructure of the fat crystal network.     

Structured-light Image Compression Based on Fractal Theory

The method of fractal image compression is introduced which is applied to compress the line structured light image. Based on the self similarity of the structured light image, we attain satisfactory compression ratio and higher peak signal to noise ratio (PSNR). The experimental results indicate that this method can achieve high performance.     

道器合一 ——基于分形理论的璧山规划展览馆设计解析

本文介绍了分形理论的概念,简述 其在建筑设计中的适用性和实践概况,并以 璧山规划展览馆项目为研究样本,探讨分形 理论在建筑设计多个环节中的具体运用过 程及策略。     

Percolative behavior of transient photoconductivity in metal-free phthalocyanine nanocrystals

Transient photoconductivity in metal-free phthalocyanine (H₂Pc) nanocrystals dispersed in a polyester matrix is investigated. The H₂Pc nanocrystals concentration dependence of transient photoconductivity is examined above the percolation threshold at different temperatures. It is found that the disorder parameter is independent of temperature and increases with concentration of H₂Pc nanocrystals. These findings can successfully be explained by percolative behavior of photocarriers on geometric fractals.     

A fractal conductivity-based approach to mobile sensor networks in a potential field

This paper presents the design of multi-robots or multiple mobile sensors and gives the results of the team behavior of them in a potential field in a collaborative manner. The aim is to prove the concept of the fractal conductivity-based approach to mobile sensor networks in a potential field. We attempted to create multi-robots having similar inherent nature, similar background knowledge, and the same mission as relevant bodies, the creation of some sort of attraction force between them is achieved with the application of fractal conductivity of belief functions. We attempted to develop multi-robots capable of carrying out an orchestrated movement in an environment having some kind of potential field such as a chemical substance contaminated into sea or lake water. The basis of the theory of behavior in a potential field is established. The fractal conductivity approach is explained. A mobile sensor structure having an input, output, and internal belief functions is designed. Internal structures of mobile sensors are implemented by software. A mobile sensor network composed of mobile sensor nodes is developed. Two communities of interest groups have been constituted. Collaborative behaviors of multi-robots in a potential field are investigated. The mobile sensors move towards a target by sensing the potential field at their locations, broadcasting the information composed of locally sensed intensity of the potential field around them and the infrastructure knowledge of themselves to other sensors and receiving the information of the potential field intensities together with the identity information that is being broadcasted from the other mobile sensors inside the potential field. The target is a source creating the potential field. A mobile sensor is a body incorporating a prior knowledge base that is the identity information in the form of a fractal belief function inside itself. After developing the theoretical basis for sensing potential field and movement, a fractal conductivity approach, which is based on fractal natures of the belief functions, is applied to this basic approach to obtain the movements of the multi-robots as a coordinated team, i.e., grouped as relevant bodies. The operation of mobile sensors based on time division multiple access method is achieved. The results of coordinated movement and obstacle avoidance have been demonstrated by the simulation results.