共查询到20条相似文献，搜索用时 125 毫秒
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文章主要研究了上半平面内正则函数的一类Hilbert边值问题。首先给出了上半平面内正则函数的一类新的Hilbert边值问题的提法,然后通过把Hilbert边值问题转化为Riemann边值问题的方法,得到了上半平面内正则函数的Hilbert边值问题的唯一解。 相似文献
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本文将Riemann边值问题转变成Riemann-Hilbert边值问题，对多元解析函数的情形，给出了一类Riemann边值问题的可解条件及解的表示式。 相似文献
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李悦 《通化师范学院学报》2014,(12):34-36
文中讨论了一类抛物方程非齐次边值问题的解法,利用变量替换法将非齐次边值问题转化为齐次边值问题,运用Rothe方法证明了其解的存在唯一性。 相似文献
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孙肖丽 《洛阳工业高等专科学校学报》2010,20(1)
单调迭代技巧是解决周期边值问题和泛函边值问题的一类重要方法,其解决的关键在于建立相应的比较定理。建立了右端项为f(t,u(t),ut)的一类非共振脉冲泛函微分方程边值问题相应的比较定理,从而为解决相应边值问题解的存在性奠定基础。 相似文献
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介绍了一般形式二阶n维双曲型方程初边值问题解的能量估计、一般形式二阶n维抛物型方程初边值问题解的能量估计以及一般形式二阶n维椭圆型方程边值问题解的能量估计,探讨了能量估计在这几类方程的(初)边值问题的一些应用,并得出一些结论。 相似文献
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首先给出了一类有节点曲线上带平方根的Riemann边值问题,在此基础上给出了其中一种很重要的情况就是无穷直线上带平方根的Riemann边值问题,通过对未知函数的结构分析,将它们化为一般的边值问题,进一步又可将其化为经典的Riemann边值问题,从而得到问题的解。 相似文献
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首先给出了一类有节点曲线上带平方根的Riemann边值问题,在此基础上给出了其中一种很重要的情况就是无穷直线上带平方根的Riemann边值问题,通过对未知函数的结构分析,将它们化为一般的边值问题,进一步又可将其化为经典的Riemann边值问题,从而得到问题的解. 相似文献
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文章给出了流体稳定运动中椭圆型偏微分方程的一般边值问题,从两个方面证明了椭圆型方程的边值问题等价于一个泛函变分的极值问题。一方面证明函数类C0中使泛函E(H)达到极小函数H m是边值问题的解,另一方面证明若有一个函数H m满足边值问题,则H m一定是E(H)在C0中的极小函数。 相似文献
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主要阐述了医学院校学生存在的学习兴趣问题、人际交往问题、学习压力问题、前途问题、情感问题、贫困生问题等心理问题。在此基础上,分析了医学院校学生心理问题产生的原因。同时,提出了医学院校开展有关学生心理健康教育的措施。 相似文献
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运用实验法,研究了聋生与听力正常学生解决加减文字题、构建加减文字题问题模型的差异。被试为小学3年级学生,聋生32名,听力正常学生33名。结果发现:聋生解决加减文字题和构建问题模型的成绩都显著落后于听力正常学生;构建问题模型在聋生解决加减文字题的过程中有着重要的作用。研究认为,在聋校文字题教学中要重视问题表征训练。 相似文献
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Doris Tyrrell 《Journal of Experimental Education》2013,81(4):323-340
The cognitive processes used by children during problem solving have received considerable attention in recent years. The identification of the processes used by both successful and unsuccessful problem solvers has been hampered by the difficulties involved in making accurate observations of mental processes which may or may not have physical manifestations during problem solving. In addition, problem solvers themselves often are unaware of many of the thought processes they use while attempting to solve problems. The most popularly used methods for studying problem solving processes are not sufficiently reliable or valid. This study explored the potential effectiveness of a new procedure for identifying and studying certain of the cognitive processes used during problem solving. In addition, the procedure was used to categorize the types of conceptual thinking problem solvers employ, to study the use of trial and error behavior, and to investigate problem solvers’ abilities to coordinate multiple bits of information. It appears that the procedure has application for generating hypotheses about cognitive processes problem solvers use. 相似文献
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农民问题是无产阶级革命和建设的基本问题。马克思主义创始人及中国化的马克思主义者毛泽东、邓小平都很重视农民问题。概括和分析马克思主义理论体系中的农民问题 ,对解决我国的农民问题有重大的历史意义和现实的指导意义。 相似文献
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李彩彦 《佳木斯教育学院学报》2012,(3):234-235
新课程中教科书由一纲一本到一标多本,基于《全日制义务教育数学课程标准》从知识点、习题形式与数量、题目类型、习题素材对人教版和苏教版三年级教科书习题比较,针对存在的问题提出建议。 相似文献
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Neither Too Sweet nor Too Sour: Problem Peers, Maternal Control, and Problem Behavior in African American Adolescents 总被引：5，自引：0，他引：5
This study examined whether maternal control protects African American adolescents from the negative influence of problem peers. Two forms of control were examined, behavioral control and psychological control. It was hypothesized that there would be a curvilinear relation between control and adolescent problem behavior, with the strength of the relationship and the amount of control optimal for adolescent development varying by the level of peer problem behavior. In general, data supported this model, particularly in regard to behavioral control, where the predicted curvilinear interaction occurred even after controlling for initial levels of problem behavior. The predicted curvilinear interaction between psychological control and peer problem behavior was statistically significant if initial levels of problem behavior were not controlled for but was not significant after controlling for initial problem behavior. These findings suggest that high-quality parenting can play a modest but critical role in the face of environmental adversity. 相似文献
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Umesh Ramnarain 《The Australian Educational Researcher》2014,41(1):43-57
A major impediment to problem solving in mathematics in the great majority of South African schools is that disadvantaged students from seriously impoverished learning environments are lacking in the necessary informal mathematical knowledge to develop their own strategies for solving non-routine problems. A randomized pretest–posttest control group design was used to empirically investigate the effectiveness of a strategies-based problem solving approach on the problem solving performance of 9th grade disadvantaged students. In this approach students receive explicit instruction on a wide repertoire of problem solving strategies. The results reported in this study show a significant improvement in problem solving performance when a strategies-based approach to problem solving was being implemented. Quantitative and qualitative analyses of the responses to the items showed how the treatment group students had internalized as part of their problem solving repertoire the strategies on which they had been explicitly instructed on. The findings of this study make a case for the adoption of this approach so that the gap between the student’s existing problem solving competence, and the cognitive demands of a problem solving task can be bridged. 相似文献