共查询到19条相似文献，搜索用时 93 毫秒
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氢解反应是有机合成中的一个重要反应,通过脱卤氢解、脱苄氢解、开环氢解、脱硫氢解、重氮盐氢解、醛酮氢解等,广泛应用于有机合成. 相似文献
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吴世旭 《绵阳师范学院学报》2009,28(8):17-21
F-展开法是近年提出的求非线性偏微分方程的精确解的一种简单而有效的方法.本文运用改进的F-展开法寻求Variant Boussinesq方程组的行波解,得到了该方程组多种类型的精确解,包括Jacobi椭圆函数解、孤立波解、三角函数解和有理函数解. 相似文献
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研究了KdV-mKdV方程的行波解求解的问题,利用双曲函数法和新的G展开法,获得了该方程的含有多个任意参数的新的行波解,分别为三角函数解、双曲函数解、有理函数解和指数函数解,扩大了该类方程的解的范围。 相似文献
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平红云 《数学学习与研究(教研版)》2010,(15):57-59
本文通过对不等式的研究和分析,对所学的知识归纳整理给出了解不等式的一些运算简便,操作灵活的方法,如零点定理解不等式,插值法解不等式,介质定理与区间法解不等式,构造法解不等式,分类讨论法解不等式,换元法解不等式,列表法解不等式,根轴法解不等式. 相似文献
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利用形变映射法,建立NLS方程与Klein-Gordon（NKG）非线性方程的一类特殊类型解的代数变换关系,根据NKG方程的已知解,获得NLS方程系统丰富的显式精确行波解,包括孤波解,周期波解,雅可比椭圆函数解. 相似文献
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上、下解与拟上下解的存在性 总被引：1，自引：0，他引：1
张骞 《西安文理学院学报》2011,14(1):8-10
利用上、下解与拟上下解方法讨论常微分方程问题时,文献均是假设上、下解与拟上下解是存在的,进而讨论方程的解.给出一阶常微分方程初值问题的上、下解与拟上下解的存在性定理,为利用上、下解与拟上下解方法讨论一阶常微分方程初值问题提供充分的依据. 相似文献
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《蒙自师范高等专科学校学报》2018,(2):122-128
本文采用Nevanlinna值分布理论知识求解带有Kerr law非线性项的扰动Schr?dinger方程的亚纯解.结果表明求解的亚纯行波解都是新的有理函数解、周期行波解和椭圆函数解。 相似文献
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利用变形映射法 ,建立Boussinesq方程与三次非线性Klein -Gordon(NKG)方程一类特殊类型解的代数变换关系。根据该关系以及NKG方程的已知解 ,获得Boussinesq方程系统丰富的显式精确行波解 ,包括孤波解、周期波解、雅可比椭圆函数解和其他精确解 相似文献
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从方程自身的特征出发,研究解的特性,引入方程的同组解、邻解、奇解与非奇解、互质解的概念,得出方程最简单的解和互质解谱树图,导出一系列解的性质的结论,且可由方程的最简单的解和互质解谱树图求出方程全部解的结果。 相似文献
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杨立波 《洛阳师范学院学报》2013,(11):9-11
对G'/G展开法进行了扩展,并将该方法应用到非线性差分微分方程的求解领域,通过借助符号计算系统Mathematica,得到了修正的Volterra格子方程的多组含参的新的精确解,包括双曲函数解、三角函数解和有理函数解. 相似文献
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Learning from worked examples is an effective learning method in well-structured domains. Can its effectiveness be further enhanced when errors are included? This was tested by determining whether a combination of correct and incorrect solutions in worked examples enhances learning outcomes in comparison to correct solutions only, and whether a mixture of correct and incorrect solutions is more effective when the errors are highlighted. In addition, the effectiveness of fostering self-explanations was assessed. In Experiment 1, the participants learned to solve probability problems under six conditions that constituted a 2 × 3-factorial design (Factor 1: correct and incorrect solutions with highlighting the errors vs. correct and incorrect solutions without highlighting the errors vs. correct solutions only; Factor 2: prompting written self-explanations vs. no prompts). An aptitude-treatment interaction was found: providing correct and incorrect solutions fostered far transfer performance if learners had favourable prior knowledge; if learners had poor prior knowledge correct solutions only were more favourable. Experiment 2 replicated this interaction effect. Thus, a mixture of correct and incorrect solutions in worked examples enhanced learning outcomes only for “good” learners. In addition, Experiment 2 showed that confronting learners with incorrect solutions changed the quality of their self-explanations: on the one hand, new types of effective self-explanations could be observed, but on the other hand the amount of the very important principle-based self-explanations was substantially reduced. A possible measure to prevent this negative side effect of incorrect solutions is discussed. 相似文献
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我国在再就业工程实践中，创造了一系列行之有效的解决再就业的措施。这些措施从不同的方面开拓了再就业的途径，使国家的再就业政策变成了广大下岗职工社会实践的指导思想。研究这些措施的基本结构与机制，探索运用这些措施所要注意和解决的有关问题，对于指导再就业实践具有重要的意义。 相似文献
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孙韬 《重庆大学学报(英文版)》2005,4(1):15-18
1 Introduction In the past 20 years with the rapid development of VLSI (very large scale integration) circuits and continual spread of electric power system scale, theories on transmission lines have become an important research field where finding the analytic solutions to lossy transmission line equations remains a tough nut. Since the mathematical tool cannot provide effective help, there is no universal method to solve transmission line equations [1]. A number of researchers have obtaine… 相似文献
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微分差分KdV方程新的类多孤子解 总被引：3，自引：0，他引：3
This article is concerned with the Hirota direct method for studying novel multisoliton solutions of the discrete KdV equation.First the Hirota method was introduced,then the novel multisoliton solutions were obtained.Simultaneously the figures of the novel one-soliton solution and two-solton solution were given and the singularity of the novel multisoliton solutions was discussed.Finally it was pointed out that the multisoliton solutions with sigularity can be called soliton-like solutions. 相似文献
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To progress from intuitive ideas to deep conceptual understanding, students need to become aware of gaps in their ideas. Attempting to solve problems prior to instruction may lead to a global awareness of knowledge gaps (i.e., awareness without being able to identify which specific component is lacking). These gaps may subsequently be specified by comparing students' solutions to the canonical solution. In our first experiment, the teacher highlighted specific gaps by comparing typical student solutions to the canonical solution before or after problem solving. The second experiment varied the factors form of instruction (with or without student solutions) and timing of instruction (problem-solving prior to or after instruction). Problem-solving prior to instruction triggered a global awareness of knowledge gaps. While this was beneficial for learning when combined with instruction with student solutions, our results indicate that comparing student solutions during instruction to specify the gaps is the most relevant factor. 相似文献
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陈玉 《江西教育学院学报》2009,30(3):1-3
当存在某个系数较其他系数有较快增长的意义下对方程解的性质起支配作用时,研究了一类高阶非齐次线性微分方程的解与小函数的关系。得到了非齐次线性微分方程的解取小函数的点的收敛指数与二级收敛指数。 相似文献
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通过修正的Jacobi椭圆函数展开法求解了一类特殊的非线性薛定谔方程,得一系列准确周期解,还得到一个简单解,在极限情况下这些周期解可退化为相应的孤立波解。另外还给出了一些解的图像,从而说明它们是包络解。 相似文献