高阶中立型方程的振动性和非振动性

本文讨论n阶中立型微分方程:d~n/(dt)~n[LX(t)]=q(t)x[T(t)] t≥t_0 (1)其中n是偶数,Lx(t):=X(t)-CX(t-τ)。我们得到了方程(1)振动的充分条件和非振解的存在性判据。     

基于非仿射随机波动率模型的欧式认股权证的定价

利用快速傅里叶变换（FFT）方法推导出了标的资产服从非仿射随机波动率模型下的欧式认股权证定价公式。给出了非仿射随机波动率模型以及特征函数,应用傅里叶变换及其逆变换推导出了欧式认股权证的定价公式。     

一类非线性中立型差分方程的振动性和非振动性

考虑下列非线性中立型差分方程 △(x_n-p_nx_(n-k))+f(n,x_(n-1))=0, n=0,1,2…… 建立了当P_n-1振动且通常的发散条件sum from n=0 to ∝(f(n,c))=∝对c>0不成立时,上述方程所有解振动和非振动的解存在的几个新的充分性条件。     

一类杀虫剂作用函数影响下的非自治综合害虫治理模型研究

长期重复使用同一种杀虫剂会使害虫对杀虫剂产生抗药性.为了避免抗药性对害虫治理的负面影响,本文采取化学控制和生物控制相结合的综合害虫治理策略.考虑到自然界害虫种群随季节周期性变化,建立了在杀虫剂作用函数影响下的具有抗药性发展的非自治综合害虫治理模型,给出了害虫灭绝的临界条件,并依据临界条件给出了合理的天敌投放量.     

神经网络融合模型在大坝变形分析中的应用

为了提高大坝变形分析模型的预测精度并检验模型的泛化能力,研究了大坝变形分析的BP神经网络模型,并基于神经网络BP算法和传统的统计模型建立了大坝变形分析的融合模型．结合陈村大坝多年的变形观测数据,对上述3种模型进行了试算及分析．分析结果表明,统计模型的平均预测精度为±0．477mm．BP神经网络模型的平均预测精度为±0．390mm,融合模型的平均预测精度为±0．318mm,相比统计模型和BP神经网络模型分别提高了33％和18％,且泛化能力较强,具有广泛的适用性．     

Simple shear endochronic eqiations for finite plastic deformation

The endochronic equations proposed by Valanis (1980) were extended to a finite deformation range. Jaumann's rate,Fu's rate and Wu's rate were incorporated into the endochronic equations to analyze simple shear finite deformation. Incremental equations and numerical solutions are deduced for three endochronic objective models. The results show that an oscillatory shear stress response to a monotonically increasing shear strain occurs when the Jaumann's rate objective model is employed for endochronic materials. The oscillatory response is dependent on the adopted objective rate. Compared with the Jaumann's rate, the Fu's rate and the Wu's rate satisfy the restrictions to elastic-plastic constitutive relations and are in agreement with the experimental results.     

Exploring the role of university students’ online self-regulated learning in the flipped classroom: a structural equation model

ABSTRACT

The flipped classroom has gained a great deal of attention in educational research and practice in recent years. The purposes of this study are to understand the relationship between students’ online self-regulated learning (SRL) and their perceptions of learning in a flipped classrooms (FC), to identify possible mediators in this relationship, and to explain how this relationship predicts students’ intentions to participate in an FC. Two questionnaires were used to gather data from 576 undergraduate or graduate students in Taiwan. The structural equation model showed that students’ in-class interactions and online SRL are predictors of their perceived quality of usefulness of online learning activities and positive experience of FC, and these, in turn, associate with their intentional behaviours of participating in FC. While students’ perceived value of interactions in physical classrooms directly related to their intentions to participate in FC, their online SRL predicts their intentions to participate in flipped learning only when mediated by the perceived quality of the usefulness of the online learning activities and positive experience of FC.     

新建地方本科高校教育服务质量与学生满意度的结构方程模型分析

通过对江西新建地方本科高校宜春学院、九江学院高等教育服务质量满意度的抽样调查,发现高等教育服务投入质量对过程质量和结果质量有显著的正向影响、过程质量对结果质量有显著的正向影响、过程质量和结果质量是影响学生满意度的主要因素、结果质量和学生满意度对学生行为意向有显著的正向影响。     

Women's path into science and engineering majors: a structural equation model

The intent of this study was to investigate the adequacy of Weidman's (1985 Weidman, J. C. 1985. “Undergraduate socialization: A conceptual approach”. In Higher education: Handbook of theory and research, Edited by: Smart, J. C. Vol. V, 298–322. New York: Agathon Press.  [Google Scholar], 1989 Weidman, J. C. 1989. “The world of higher education: A socialization-theoretical perspective”. In The social world of adolescents: International perspectives, Edited by: Hurrelmann, K. and Engel, U. 87–105. New York: W. de Gruyter.  [Google Scholar]) theoretical undergraduate socialization model as an empirical-based causal model pertaining to women's career path choice into a science or engineering (SE) major via structural equation modeling. Data were obtained from the Beginning Postsecondary Students Longitudinal Study (1996–2001) from the U.S. Department of Education. Results indicate that Weidman's model was somewhat supported. Results from the evaluation of the causal model suggest that women's path into an SE major was influenced by both collegiate and non-collegiate factors, with 1st-year college grades and high school math grades being the dominant indirect influences.     

边疆少数民族地区大学生民族认同与民族区分的关系模型

运用结构方程模型探寻边疆少数民族大学生民族认同和民族区分的关系。采用大学生民族认同问卷对265名大学生进行问卷调查。结果发现：①民族认同和民族区分之间存在显著的正相关关系（P〈0.05或P〈0.01或P〈0.001）;②汉族和少数民族学生对本民族之外的民族区分态度和行为差异有统计学意义（P〈0.05）;③民族认同对民族区分有直接而显著的预测作用（P〈0.05或P〈0.001）。由此可见：个体对本民族（中华民族）的高度认同和外民族（国外民族）的低区分联系在一起;民族认同的排他性（民族区分）受个体所处的情境以及个体间的竞争性等因素影响。     

对高职高专英语多媒体网络教学的思考

随着我国英语教学改革的实施,多媒体网络教学也在各高职院校试行和推广。在多媒体网络环境下,各种教学资源将得以更有效的应用,有利于创设一个智能化的教学环境,使学生从被动接受知识的模式中解放出来。然而,如果过多过滥地运用多媒体教学,违背了多媒体“辅助”教学的宗旨,就会使学生在课堂上走马观花,导致课堂教学流于形式。本文分析我国高职院校英语课程采取这种教学模式的必要性,以及存在的问题,提出多媒体教育应与传统教育相结合。     

Technology-enhanced learning and research using databases in higher education: the application of the ODAS model

Abstract

Research databases are a significant contributing aspect of modern technology, and, as such, innovation has enhanced learning and research outputs using online databases introduced by authorities in charge of higher education. However, databases have been rarely investigated from the perspective of psychological assessment. Therefore, this research examined databases using structural equation modelling and the Rasch model to explore contributing factors of learning and research in higher education. To measure databases, this research adapted the online database adoption and satisfaction (ODAS) model and analysed the responses of 300 postgraduate students, from a double first class university in Shanghai, collected using a stratified random sample technique. The results of the ODAS model showed that the postgraduate students’ perceived usefulness and ease of use of databases played mediating roles in establishing connections between their computer self-efficacy and intention to use and satisfaction with databases for research and learning. However, the ODAS model also showed that the students’ satisfaction was indirectly explained by their perceived usefulness of databases through ease of use and intention to use. The results of our investigation contribute to a better understanding of the ODAS model and suggest assessment strategies for learning and research through databases for researchers, academicians, and librarians.     

Stories in networks and networks in stories: a tri-modal model for mixed-methods social network research on teachers

Social network research on teachers and schools has risen exponentially in recent years as an innovative method to reveal the role of social networks in education. However, scholars are still exploring ways to incorporate traditional quantitative methods of Social Network Analysis (SNA) with qualitative approaches to social network research. This article provides a mixed-methods model for researching teachers' social networks and an empirical example of the model in practice. The model incorporates a tri-modal coding approach that promotes data validity while uncovering network data that some SNA methods may overlook.     

A structural equation model analyzing the relationship of student achievement motivations and personality factors in a range of academic subject-matter areas

The question of subject-specificity of achievement motivations is important, both for educational psychology, as well as for educational policy. This study contributes to the investigation of the heterogeneity in achievement motivations in the context of the expectancy-value model. Whereas existing research deals with middle and high school students and their motivations for a range of broad domains, this article focuses on university students (n = 264) and subject domains that are more congruent. We adopt an affect-extended version of the expectancy-value model. Using structural equation methods, we are able to decompose achievement motivations in generic and subject-specific components.