伯努利方程的原理及运用浅析

伯努利方程原理是流体力学中的一个重要定理,涉及很多流体力学的知识,在现实生活中运用很多。由于一些知识点难以理解,在实际的解题和运用中让一些师生疑惑不解。本文重点剖析了伯努利方程的原理内涵及在现实生活中的一些应用。     

基于复合模型理论的害虫测报方法研究

本文总结了害虫预测预报四个不同时期(经验预测、实验预测、统计预测及信息预测)常用的预测预报方法;概述了惯性原则下的害虫可预测预报科学依据,借助Logistic方程分析了害虫种群系统发生发展最终呈现混沌性的规律;根据害虫种群混沌系统中非线性及线性共存的特点,提出了害虫预测预报方法中运用复合模型理论的改进设想。     

The effect of television viewing on ethnic prejudice against immigrants: A study in the Italian context

Television viewers construct many different meanings from the programs they watch. Here, we investigated whether ethnic prejudice is differentially influenced by the genre of television programs in their portrayal of ethnic minorities. We also wanted to determine whether a higher educational level reduces ethnic prejudice and television use. A self-reported questionnaire was administered to 401 Italian adults. Structural equation modeling was used to analyze the relationships between ethnic prejudice and television program contents and educational level. Viewing Reality and Variety Shows was positively related to ethnic prejudice, News and Public Affairs was negatively related, and Films and TV series had no apparent influence on prejudice. Educational level was negatively related to both ethnic prejudice and watching Reality and Variety Shows, and positively related to viewing News and Public Affairs and Films and TV series programs.     

个体、群组、组织间知识转移影响因素的实证研究

基于现有知识管理理论,以个体、群体和组织为中心,提出知识转移的因素模型。通过多家企业的问卷调查,采用结构方程(SEM)的分析方法,对该因素模型进行了验证和修订。揭示了信任、人际关系、激励、决策者态度、知识管理系统、知识吸收能力六因素及其相互间的量化关系,为企业知识管理的实施和改进提供指导。     

第二类Fredholm积分方程的快速数值解法

对于具有弱奇性核函数的第二类Fredholm积分方程，将核函数所定义的区域分成大小不同的正方形子区域，利用分层插值多项式逼近核函数，由此得到近似矩阵B实现了积分方程的快速数值解法。在最后，对如何提高方案的数值稳定性作简要讨论并给出要讨论并给出数值结果。     

一个微分-积分恒等式的推广及应用

推广了一个微分一积分恒等式，并用这个新的恒等式研究了一类二阶微分方程振动与非振动的条件．     

放大器的容错分析

放大器的性能参数变化取决于组成它的元器件的参数变化,这些元器件的参数通常是互相独立的随机变量,收集元器件的分布参数,可计算出线路性能指标的漂移范围,如果计算出的结果超出允许范围,就应重新选择元器件的参数范围,再进行计算,直到符合要求.整个计算过程可借助概率论的有关知识来实现.这种分析和计算对放大器的设计具有一定指导意义.     

关于Pell方程qx2-（qn±6）y2=±1（q是素数）

运用Legendre符号和同余的性质给出了形如qx2-（qn±6）y2=±1（q是素数）型Pell方程无正整数解的4个结论.这些结论对研究狭义Pell方程x2-Dy2=±1（D是非平方的正整数）起了重要作用.     

谐振子量子制冷循环性能的优化分析

基于量子主方程和半群逼近研究以谐振子系统为工质，由两个等温和两个等谐振子数过程组成的不可逆谐振子量子制冷循环的一般性能特性，导出了制冷循环的制冷系数、制冷率、输入功和熵产率等重要参数的一般表达式．并详细讨论了高温极限下谐振子量子制冷循环的优化性能，导出了最大制冷率和相应的制冷系数．所得结论可为非常规工质低温制冷循环的优化设计提供理论基础．     

Self‐efficacy,school resources,job stressors and burnout among Spanish primary and secondary school teachers: a structural equation approach

This study examines the relationship between school resources, teacher self‐efficacy, potential multi‐level stressors and teacher burnout using structural equation modelling. The causal structure for primary and secondary school teachers was also examined. The sample was composed of 724 primary and secondary Spanish school teachers. The changes occurring in the Spanish teacher role in the last decade were taken into account to select job stressors. The results obtained revealed that external (school support resources) and internal (management classroom self‐efficacy and instructional self‐efficacy) coping resources have a negative and significant effect on job stressors. In turn, job stressors have a positive and significant effect on teachers’ burnout considering it as both a unidimensional and multidimensional construct. Furthermore, the hypothesised structure of burnout dimensions revealed that emotional exhaustion plays a key role in explaining Spanish school teachers’ burnout. Practical implications of these findings are discussed.