定向爆破拆除高危烟囱的实践

通过对已产生纵向裂缝、倾斜和基部风化剥蚀严重的高危烟囱的定向（向倾斜相反方向）倒塌爆破实践表明：设计中选用爆破参数及施工措施是有效的。     

复参数最大熵图像重建的剑桥算法

本文将正实参数的最大熵图像重建的剑桥算法推广到复参数，此算法能较好的地恢复复参数“图像”。文中还给出了此算法在逆散射成像中应用的计算机模拟实验结果。     

光纤传感器的标定曲线拟合与误差分析

本文介绍了一种求取实际光纤传感器标定曲线及函数的有效方法。以压电式光纤电压传感器实测数据为例，详细患解出了其标定函数和曲线，并进行了误差分析。     

一种混沌信号去噪方法的研究

以Takens嵌入定理和影子定理为理论依据，提出一种能对混沌信号去噪的局部投影方法。该方法不需潜在动力学系统的先验知识，符合工程实用的要求。通过实验结果表明这种方法对混沌信号去噪很有效。     

非均匀有耗媒质部分参数的重建

在高频部分，通过用Ｗｅｎｔｚｅｌ—Ｋｒａｍｅｒｓ—Ｂｒｉｌｌｏｕｉｎ—Ｊｅｆｆｅｒｙｓ（ＷＫＢＪ）解作为内场近似，本文证明了有耗非均匀媒质的反射系数在复平面上的轨迹是个圆。根据不同入射角度、不同极化的高频反射系数圆的圆心与半径，可以重建出有耗媒质的部分关键参数。本文方法同时适用于已知复反射系数谱和仅知反射系数振幅情况。文中给出具体重建实例。     

带有给定切线多边形的保形有理三次B样条曲线

本文给出了带有给定切线多边形的保形有理三次Ｂ样条曲线，其部分权因子可通过选取切点的位置来确定，由此方法还导出了保形有理三次Ｂ样条插值曲线，最后，给出了两个例子。     

EDA介质快慢横波时差和振幅-方位曲线的实验分析

在含垂直定向裂隙的各向异性（EDA）介质中，地震快、慢横波传播的时差及振幅随裂隙（缝）方位变化曲线能反映裂缝的密度、走向和介质的性质，这对多波地震资料的处理、解释有着重要意义。但受观测条件限制以及噪声的影响，在横波分裂记录上，同相轴往往会出现扭曲、倾斜和不规则抖动等现象，给快、慢横波时差的求取和振幅-方位曲线的绘制带来误差。设计了EDA介质物理模型，并利用岩石超声波测量系统获得了快、慢横波记录；分析记录可知，在相同传播方向的分裂横波具有走时和传播速度不随裂缝方位变化的恒定性特征；以此为基础，提出了利用平均法和瞬时振幅法来计算快、慢横波的走时时差和绘制振幅-方位曲线，以提高精度。利用物理模型实验得到的2个正交横波（S1波与S2波）的快、慢横波记录，分别用平均法和瞬时振幅法计算了快、慢横波走时的平均值、时差和均方差，并绘制了相应的振幅一方位曲线。结果表明，采用上述2种方法，消除了同相轴扭曲、倾斜和不规则抖动等对计算结果的影响，时差的计算是可靠的，振幅一方位曲线的绘制是合理的。     

Phase equilibria of quasi-binary systems consisting of multicomponent polymers 1 and 2. IV: Poly(ethylene oxide)/poly(propylene oxide) systems

To confirm the reliability of the theory of phase equibria of multicomponent polymer 1/multicomponent polymer 2 systems (i.e. quasi-binary systems) and the method of computer experiment based on this theory (Brit. Polym. J., 23 (1990)285; 23 (1990)299; Polym. Int., 29 (1992)219), could point curves (CPC), two-phase volume ratios ( R ) and critical solution points (CSP) have been determined experimentally for the quasi-binary mixtures of poly(ethylene oxide) (M¯_w = 647, M¯_w/M¯_n = 1.15; M¯_w and M¯_n, the weight-average and numberaverage molecular weights, respectively) and poly(propylene oxide) (M¯_w = 2028, M¯_w/M¯_n = 1.08; and M_w = 2987, M_w/M_n = 1.13). The hydroxyl end groups of both polymers were methoxylated in advance by the Cooper & Booth method (Polymer, 18 (1977)164). The thermodynamic interaction parameter between both polymers, χ₁₂, and the concentration dependence parameters for the above quasi-binary systems were determined by the method proposed in a previous paper (Brit. Polym. J., 23 (1990)299). CPC, R and CSP values calculated on the basis of the theory are in good agreement with the values determined experimentally.     

Geometry-Dependent R-Curve for Quasi-Brittle Materials

Fracture of quasi-brittle materials such as ceramics and cement-based materials can be described by an R -curve, defined as fracture resistance. The R -curve can be constructed as the envelope of the strain energy release rates ( G ). In this study, R -curve is defined as an envelope of G -curves obtained by varying the dimensions of identical specimens, while keeping the geometry and the initial flaw size constant. By approximating the G -curve with a second-order function of the crack length, a simple formulation of the R -curve is derived by solving a differential equation. Three parameters are needed for the proposed R -curve. These parameters can be obtained by testing a notched-beam specimen and using linear elastic fracture mechanics. The proposed R -curve simulates well the geometry dependency as well as other characteristics of the fracture response of quasi-brittle materials.     

渐变填充的性质和算法

本文着重研究了Jordan数字流形上的渐变填充,设计了紧缩渐变填充算法和分裂渐变填充算法;并证明:如果D是离散网格空间上的Jordan凸集,那么存在O(|D||D|)时间的紧缩算法去做渐变填充.最后,我们对Jordan正方形区域、三角域和圆盘,分别给出了它们各自的O(|D|log_2|D|)时间的分裂渐变填充算法.