一类退化的线性规则模型构造

本文构造了一类退化的线性规划模型，它是文^[1]中循环实例的推广，利用所得结论可以快速地求出此类模型的最优解。     

语法里的歧义现象

歧义是比较常见的语法现象.最普通的歧义由多义词引起.另外,句子构造层次、语法关系、成分的类型不同,也会造成句法歧义.词汇以外的原因引起的歧义是语境歧义.这三种歧义现象使语言的运用更加丰富多彩.     

浅谈中学数学教学中的反例

在新的<数学课程标准>中,要证明一个命题正确,必须经过严密的推论,而要否定一个命题,却只需要能举出一个与结论相矛盾的例子就行,这个与命题相矛盾的例子便称为反例.反例是简明有力的否定方法;反例是加深理解的重要手段;反例是纠正错误解答的常用办法;反例可以发现问题;构造反例是活跃思维的一种途径.     

蚕食鲸吞

不同的进食方式一个细嚼慢咽,一个大口吞食,这是蚕和鲸不同的吃饭方式。想一想,造成这种差异的原因是什么?没错,主要原因就是它们的身体构造不同。     

添加梯形辅助线方法探索

辅助线对处理复杂的图形问题非常重要．通过构造辅助线，复杂的图形可以分解成简单的图形．现以求解梯形问题为例与同学们共同研究．     

构造全等三角形解四边形问题

全等三角形和四边形知识联系非常紧密，四边形的许多性质、定理都是用全等三角形知识导出的．因此，运用几何转换，适当构造全等三角形，有助于四边形问题的解决。     

Fuzzy Comprehensive Assessment Method to Determine Tectonic Stress Patterns

The tectonic stress patterns were determined by a fuzzy comprehensive assessment method. Data of in-situ survey and fault information were utilized in the method. First, by making pressure and tension in the directions of along-river, cross-river, shear clockwise, and shear counterclockwise , 26 types of tectonic stress patterns were presented. And the stress vector of each pattern was obtained with FE software by taking unit displacement as boundary load. Then, by taking the 26 types of tectonic stress patterns as index set and 3 main stresses as factor set and choosing various operators, comparison of directions of computational stress vector and survey stress vector was made and the most possible tectonic stress pattern was obtained. Taking the 26 types of tectonic stress patterns as index set and strike angle as factor set, comparison of relationships between formation of fault and tectonic stress was made,and the tectonic stress patterns were assessed with known fault information. By summarizing the above assessment results, the most impossible tectonic stress pattern was obtained . Finally an engineering case was quoted to validate that the method is more feasible and reliable than traditional empirical method.     

同源词浅论

汉字中有不少字有同一来源，即先有一个字，后来出现意义相同或相近的概念，就造一个语音相同或相近的字来表示，这就是同源字。如枯、涸、竭音义都有联系，是同源字。决、块、缺、阙都有“缺”的意思（玉缺为块，水缺为决，器缺为缺，门缺为阙），语音也相似或相同，也是同源字。有的同源字在古代意义相同或相近，由于意义长期演变，现在已看不出联系，但从古籍或一些合成词里仍然看得出联系，它们仍然是同源字。如“迫”和“薄”，在现代汉语中完全没有意义联系，但成语“日薄西山”里，“薄”还保留了“迫”（逼近）的意义。本文不称同源…     

构造三元齐次线性方程组解题

本文介绍构造三元齐次线性方程组,应用其有非零解的充要条件是它的系数行列式为零的定理,对部分代数、几何、三角问题和著名的牛顿“牛吃草”问题进行巧思妙解。