共查询到20条相似文献，搜索用时 156 毫秒
1.
利用不动点定理证明了由高阶P-拉普拉斯算子微分方程和多点边值条件构成的一类多点边值问题的解的存在性.获得了此类边值问题至少存在一个正解的一个充分条件. 相似文献
2.
3.
郭建敏 《忻州师范学院学报》2007,23(5):10-14
利用关于锥拉伸锥压缩的Krasnoselskii不动点定理讨论了非线性奇异三阶两点边值问题u(t) λa(t)f(u(t))=0,0相似文献
4.
应用Green函数将分数微分方程边值问题转化为积分方程的方法讨论分数阶微分方程边值问题正解的存在性.研究非线性分数阶微分方程的两点边值问题,主要工具是锥上的Krasnosel'skii不动点定理.结果表明:只要非线性项在某些有界集合上的"高度"是适当的,该问题有n个正解(n是一个任意给定的正整数). 相似文献
5.
利用Krasnoselskii不动点定理,得到了时间测度上一类非线性二阶三点边值问题至少N个正解的一个充分条件. 相似文献
6.
研究了一类非线性高阶两点边值问题的正解存在性,利用抽象锥上的不动点定理,证明了当非线性项可以取负值时,边值问题多个正解的存在性. 相似文献
7.
研究了一类非线性三阶两点边值问题的正解.在这个问题中非线性项具有时间和状态的奇异性.通过构造适当的锥并且考察非线性项在无穷远处的增长速度的极限获得了一个正解存在定理. 相似文献
8.
9.
研究了一类三点边值问题正解的存在性.当非线性项可以变号时,给出了三个正解的存在性定理. 相似文献
10.
应用锥上不动点定理,研究具有P-Laplacian算子的时滞微分方程边值问题正解的存在性,利用新的分析技巧建立了其至少存在一个正解的充分条件。所研究的具有P-Laplacian算子的微分方程边值问题中含有滞量,因此所得结果具有重要的实际意义。 相似文献
11.
在涉及重级的情况下,研究有穷非整数级亚纯函数唯一性,所得的结论推广并改进了陈桂玲、张晓斌等人的一些结果. 相似文献
12.
研究了一类阻尼振动问题（1）,通过建立恰当的变分设置,在一定条件下,获得了该阻尼振动问题的周期解的多重性结果．得到的结果推广和改进了文献[1]和文献[2]的主要结果． 相似文献
13.
应用临界点理论,通过建立恰当的变分框架,获得了二阶-Laplacian差分方程Dirichlet边值问题解的存在性和多重性的充分条件. 相似文献
14.
讨论一类具有状态时滞的微分方程正周期解问题,利用锥不动点定理,获得了这类问题正解存在性和多重性的充分条件,推广了[1]的结果. 相似文献
15.
张鹏 《内江师范学院学报》2010,25(2):17-22
不假设f满足超二次条件,也不假设f（x,t）/｜t｜^p-1关于t不减,利用变化的山路引理,证明了一类超线性p—Laplacian椭圆方程解的存在性和多重性． 相似文献
16.
Robert A. Cribbie 《Structural equation modeling》2013,20(1):98-112
AbstractResearchers conducting structural equation modeling analyses rarely, if ever, control for the inflated probability of Type I errors when evaluating the statistical significance of multiple parameters in a model. In this study, the Type I error control, power and true model rates of famsilywise and false discovery rate controlling procedures were compared with rates when no multiplicity control was imposed. The results indicate that Type I error rates become severely inflated with no multiplicity control, but also that familywise error controlling procedures were extremely conservative and had very little power for detecting true relations. False discovery rate controlling procedures provided a compromise between no multiplicity control and strict familywise error control and with large sample sizes provided a high probability of making correct inferences regarding all the parameters in the model. 相似文献
17.
刘玉玲 《喀什师范学院学报》2010,31(3):3-5
通过利用Leggett-Williams定理,对于一类非线性二阶m-点边值问题建立了三个正解以及2n-1个正解的存在性定理,并对所得结果给出了实例. 相似文献
18.
John T. Guthrie A. Laurel W. HoaAllan Wigfield Stephen M. TonksNicole M. Humenick Erin Littles 《Contemporary educational psychology》2007
Reading motivation has been viewed as a multifaceted construct with multiple constituents. Our investigation of motivational multiplicity expanded on previous literature by including motivation constructs (interest, perceived control, collaboration, involvement, and efficacy), text genres, specific versus general contexts, and the self-versus other evidence sources about motivation. We expected that this multiplicity would influence the identification of reading comprehension growth predictors. We obtained pre- and post-interview data, teacher ratings, motivation self-reports, and reading comprehension scores. Interviews showed motivation constructs to be semi-independent. Students’ reading motivations for narrative and information texts were not highly associated; and self-reports and other motivation reports were not highly associated, but situated and general reading motivations were correlated. Interview-based coding of motivation predicted reading comprehension growth, but reading comprehension did not predict motivation growth. Situated motivation for information books predicted general motivation growth according to multiple regression analyses. Implications for an engagement model of reading development were discussed. 相似文献
19.
通过对化学理论的发展、化学研究的主客体关系、化学研究方法等多层次多角度剖析,对物质的多样性和统一性的辩证关系进行了探讨。多样性只是客观世界的表现形式,统一性才是其本质。 相似文献
20.
Growing evidence suggests that child care instability is associated with child behavior problems, but existing studies confound different types of instability; use small, convenience samples; and/or control insufficiently for selection into child care arrangements. This study uses survey and calendar data from the Fragile Families and Child Well-Being Study to estimate the associations between three different types of child care instability—long-term instability, multiplicity, and the use of back-up arrangements—and children's internalizing, externalizing, and prosocial behaviors at age 3, controlling for a large number of child and family background characteristics. Long-term instability between birth and age 3, as measured in both the survey and calendar data, is associated with higher levels of externalizing behavior problems. Current multiplicity at age 3 (as measured by survey data) is associated with higher levels of both externalizing and internalizing behavior problems, but stable multiplicity over time (as measured using calendar data) is not. Finally, the use of back-up arrangements at age 3 is associated with higher levels of internalizing behaviors. We find no consistent differences in these results by the timing of instability, child gender, family income, or type of care. 相似文献