基于马尔可夫随机场的遥感图像分割和描述

讨论了基于马尔可夫随机场的遥感图像分割．根据卫星遥感图像的特点,建立了相应的基于马尔可夫随机场的图像分割模型．由此将图像分割问题转化成图像标记问题, 并进一步转化成求图像的最大后验概率估计的问题． 本文引进了一种基于博弈理论的决定性退火算法, 可以用该算法对图像进行标记, 该算法收敛于局部最大, 在实验中取得了很好的效果．     

谱分析方法在经济波动分析中的应用研究

针对我国经济序列较短的特点,将加窗周期图谱估计与最大熵谱估计相结合的谱估计方法用于经济周期波动的分析,并用各隐周期分量单独分辨的办法通过对数据进行三角叠加拟合来确定隐周期长度的准确值。     

功率放大实验电路分析

纵观许多高校的模拟电子技术实验指导书，在OTL功率放大电路这一基本实验中，由于某些器件选型欠妥，致使实测数据与希望值相差悬殊，影响实验效果。文章就这一问题作一点分析讨论，并确定出较适合该的实验电路的相关器件。     

动态最优税率设计问题:一个Stackelberg微分对策模型

利用微分对策理论，定量地探讨动态最优税率的设计问题。首先在一定的假设条件下建立描述动态最优税率设计的Stackelberg微分对策模型，政府在此模型中充当对策的“主者(1eader)”，企业充当对策的“从者(fol-lower)”。然后利用极大值原理及倒向微分方程，分析当政府考虑到企业潜在的理性反应时，如何制定出最优的税率，使税收在考察时期里最大化，最后给出不同均衡解的经济含义以及模型可能的扩展。     

CaO颗粒脱硫反应动力区最大粒径的实验研究

为了最大限度地降低CaO颗粒表面的脱硫产物层对二氧化硫以及氧气分子扩散过程的负面影响,用TGA-2100热重分析仪对3种自制钙基脱硫剂颗粒的脱硫反应过程进行了系列实验研究.实验结果表明 当脱硫反应温度为800 ℃时,经过水合反应的脱硫剂的动力区直径达到最大值77～150 nm; 分析纯CaO和工业级石灰的动力区直径在900 ℃达到最大值; 在反应温度和颗粒直径相同的条件下,工业级石灰的动力区直径大于分析纯CaO的动力区直径.     

An improved double-threshold method based on gradient histogram

This paper analyzes the characteristics of the output gradient histogram and shortages of several traditional automatic threshold methods in order to segment the gradient image better. Then an improved double-threshold method is proposed, which is combined with the method of maximum classes variance, estimatingarea method and double-threshold method. This method can automatically select two different thresholds to segment gradient images. The computer simulation is performed on the traditional methods and this algorithm and proves that this method can get satisfying result.     

Prediction of solar cycle based on the invariant

A new method of predicting solar activities has been introduced in this paper. The method can predict both the occurrence time and the maximum number of sunspot at the same time. By studying the variation of sunspot, we find that the combination of the several variables was nearly invariable during the entire solar cydes, as called invariant. And just only by determining the start time of a cycle, we can predict the occurrence time of cycle‘s peak value accurately. Furthermore, according to observational data of the sunspot cycles, it showed that the sunspot maximum number has correlation not only with the prophase variety of the number in the cycle but also with the anaphase of the previous period. So we can introduce an equivalent regression coefficient, which can dynamically self-adapt to different cycle lengths, and effectively solve the inconsistency between the accuracy and the lead-time of the forecast. It can guarantee the satisfied accuracy and effectively increases the lead-time of the forecast. This method can predict the maximum sunspot number for solar cycle at the approximate half rise of the period. This method predicts that the occurrence time of the maximum sunspot number for cycle 24 will be in January 2011.     

Effect of bromization on the propertises of a series of substituted 1,8,15,22—tetra（2,4—ditertbutylphenoxy） phthalocyanines

A series of 1,8,15,22-tetra(2,4-ditertbutylphen-oxy) phthalocyanines [α-（oAr）4PcM,M1=(H)2,M2=Pd,M3=Cu,M4=Zn,M5=Pb] were synthesized in this study.Each compound was bromized in two kinds of solvent.One is the solvent mixture of 1,1,2-trichloroethane and water,the other is 1,1,2-trichloroethane alone.The effects of solvent,bromine excess added and reaction duration on the bromization reaction were studied.The shift of maximum absorbance wave-length both is solution and in solid thin film was investigated comparatively,discovering that both were bathochromism but the former was more.TG data showed that the temperature of thermal decomposition decreased continuously with the increase of numbers of bromine.Finally,the fragments produced during the bromization of (OAr)4PcPb in 1,1,2-trichloroethane were characterized by GC/MS.Based on the electronic structure,the possible mechanism of decomposition of these compounds was presented and discussed.     

基于双尺度连续小波变换的二相编码信号识别

针对信号和噪声小波变换的模极大值在不同尺度上表现出截然不同的性质,提出一种利用粗细定位相结合的思想对二相编码信号奇异点实现精确定位的方法。该方法采用大尺度上的模极值点进行粗略定位奇异点出现的范围,并据此去除小尺度上的伪极值点,用小尺度上的模极值点精确定位奇异点出现的时刻。实验仿真比较了几种不同小波基函数下的算法性能,结果表明,该方法在采用db3小波基下对二相编码信号突变点的识别具有很好的效果。     

基于预期机制的供应链产品转移价格混沌预测研究

将供应链管理系统中与原材料和产品流动过程有关的产品转移价格作为上游企业基于提前期内下游企业对产品的反馈信息作出的预期价格.提出了预期机制下供应链产品的非线性、非均衡转移定价模型,研究了供应链管理系统产品转移价格决策的混沌动力行为,并基于最大Lyapunov指数对供应链产品转移价格进行预测.最后,通过实例进行分析其应用价值.