浅论引进人才的正负效应

本从人才是生产力，人才是宝贵资源，人才合理配置激活人才的潜能等方面论证引进人才的正面效应。又从用人单位和人才的自身选择和能力的角度论述引进人才的负面效应，最后提出了发挥并巩固正向效应，减少与克服负面效应的办法。     

一类非线性三阶边值问题正解的存在性

讨论了三阶常微分方程边值问题解的存在性,其中f(t,u):[0,1]×R →R 为连续函数.在满足一些增长性条件的情形下,用指数不动点理论获得了正解的存在性结果.     

具有有限个时滞的竞争系统全局周期解的存在性

利用重合度理论的延拓定理讨论具有有限个时滞的竞争系统全局周期解的存在性,得到了一些新结果.     

Antecedents of academic emotions: Testing the internal/external frame of reference model for academic enjoyment

The present study focused on students’ academic enjoyment as predicted by achievement in multiple academic domains. Assumptions were based on Marsh’s internal/external (I/E) frame of reference model and Pekrun’s control-value theory of achievement emotions, and were tested in a sample of 1380 German students from grades 5 to 10. Students’ academic enjoyment, self-concept, and achievement were assessed in relation to mathematics and verbal language classes. In line with assumptions of the I/E model, mathematics performance assessed in the previous academic year positively predicted enjoyment in mathematics classes, and negatively predicted enjoyment in language classes. Language class performance positively predicted enjoyment in language classes, and negatively predicted enjoyment in mathematics classes. Corroborating assumptions derived from Pekrun’s control-value theory, achievement/enjoyment relations were mediated by academic self-concepts. Despite stereotypic gender differences in mean values, linkages between constructs were invariant across genders.     

Causal judgments of positive mood in relation to self-regulation: A case study with Flemish students

To examine students’ causal judgements of positive mood in relation to self-regulation, 128 participants from two different schools representing two distinct educational environments (Technical/Vocational School (TSO/BSO): N = 63; General Secondary School (ASO): N = 65) were asked to judge 45 statements containing three possible relationships (A → B; A ← B; A <> B) for all iterations of 5 constructs associated with positive mood, namely Hope, Optimism, Resilience, Confidence, Persistence, 4 constructs associated with self-regulation, namely Motivation, Social support, Problem-solvingLearning goals, and 1 construct representing Academic performance. Based on a Pareto analysis, mental models were constructed for each school. An analysis of the mental models indicates that all students believe positive mood constructs to be causally related to self-regulation constructs with Academic performance identified as the main driver and Learning goals as the primary outcome for both schools. It is concluded that an appreciation of participants’ causal attributions of positive mood states in relation to self-regulation can present a clearer picture of the conditions under which participants’ causal understanding of positive mood and self-regulation constructs can be activated and used as an interpretive and evaluative framework in learning encounters.     

Growth goals and growth mindset from a methodological-synergistic perspective: lessons learned from a quantitative correlational research program

This review explores predictors and consequences of students’ growth goals and growth mindset in school with particular emphasis on how correlational statistical methods can be applied to illuminate key issues and implications. Study 1 used cross-sectional data and employed structural equation modelling (SEM) to investigate the role of growth goals in mediating the link between interpersonal relationships and academic engagement. Study 2 conducted multi-group path analysis to investigate the role of growth goals in the academic outcomes of two groups of students (ADHD and non-ADHD). Study 3 used longitudinal data and SEM to test a cross-lagged panel design to investigate reciprocal links between growth goals and growth mindset. Study 4 conducted multi-level SEM where the effects of a growth orientation on engagement and achievement were investigated at the student-level (level 1) and the classroom-level (level 2). Taking these four studies together, we aim to show how correlational data and multivariate correlational analyses have been effective in answering research questions in a way that have practical and theoretical implications for students’ academic growth. We also position this review as a substantive-methodological synergy – an approach recently recommended in response to concerns about the increasing polarization of substantive and methodological research and researchers.     

捕食者-食系统的捕获优化问题

对两种群捕食者-食系统捕获与优化问题进行了定性分析,并讨论了其生态意义,求出了利润最大时的最佳投入.     

广义Nekrasov矩阵的一组充分条件

利用定义和不等式的放缩给出广义Nekrasov矩阵的一组充分条件,改进和推广了已有相关结果,并用数值实例说明了所得结果的有效性。     

关于正项级数的Cauchy判别法和D''''Alembert判别法的推广

本文将正项级数的Cauchy判别法和D′A;embert判别法进行推广,得到了关于正项级数敛散性的二个新的判定定理.     

二阶奇异周期边值问题正解的存在性和多重性

研究了二阶奇异周期边值问题u（″t）＋a（t）u（t）=f（t,u（t））,t∈[0,ω],u（0）=u（ω）,u（′0）=u′（ω）正解的存在性,当允许f（t,u）在u=0和u=c（c〉0）同时奇异时,用锥映射的Krasnoselsk ii不动点定理获得了其正解的存在性和多重性结果.