广义线性系统极点配置的方法     

杨战民  刘利华  谭宏武  王社宽 《咸阳师范学院学报》2004,19(2):5-7

研究了广义线性系统的极点配置问题，利用矩阵的奇异值分解和矩阵的广义逆得到了广义线性系统的奇异值标准形，使得广义线性系统的极点配置问题转变为正常系统的极点配置问题，从而给出广义线性统极点配置的一种新方法。  相似文献   

应用MATLAB求线性方程组的Cramer法则方法探讨   总被引：1，自引：0，他引：1  

周均  韩乐文 《重庆职业技术学院学报》2004,13(3):129-130

本文分析了几种用MATLAB求解线性方程组的Cramer法则的方法,并指出这些方法的改进过程及其教学价值.  相似文献   

Explaining the substantial inter-domain and over-time correlations in student achievement: the importance of stable student attributes     

Gary N. Marks 《Educational Research and Evaluation》2016,22(1-2):45-64

Multi-domain and longitudinal studies of student achievement routinely find moderate to strong correlations across achievement domains and even stronger within-domain correlations over time. The purpose of this study is to examine the sources of these patterns analysing student achievement in 5 domains across Years 3, 5 and 7. The analysis is of longitudinal population data of over 22,000 students and utilizes fixed-effects models to incorporate stable general and domain-specific latent factors. These latent factors correspond to a general cognitive-ability-like factor and specific aptitudes in particular, or types of, subject areas. The preferred model incorporates both general and domain-specific latent factors with stronger effects for the general factor, although the domain-specific factors are particularly strong for spelling and numeracy. When taking into account general and domain-specific latent factors, the effects of student’s socioeconomic status (SES) and school SES are trivial.  相似文献   

How children's creative visual imagination and creative thinking relate to their representation of space     

Dorota M. Jankowska  Aleksandra Gajda  Maciej Karwowski 《International Journal of Science Education》2019,41(8):1096-1117

This article explores how creative visual imagination and creative thinking can help children to construct mental models of space. A mixed-method study, integrating quantitative and qualitative approaches and involving 98 five-year-old children (54 girls and 44 boys) demonstrated that creative visual imagination, rather than creative thinking, is linked with the knowledge and understanding of space. These results support the notion that creative visual imagination contributes to improvements in children's understanding of basic astronomical concepts. Interestingly, creative thinking was not associated with understanding and knowledge of cosmic phenomena in models taking into account creative imagination. The qualitative analysis showed differences in children's representations of space. We discuss the consequences of these findings for science education, particularly the teaching of elementary astronomy.  相似文献   

高职教育导师制：意义，模式和应注意的问题     

陈文东 《教育科学论坛》2007,(2B):9-11

社会发展对高职教育提出更高的要求。本文从高职教育要构建新的人才培养模式出发，阐述高职教育实施导师制的意义、可运作的模式和应注意的问题。  相似文献   

Can research on science learning and instruction inform standards for science education?   总被引：1，自引：0，他引：1  

Linn  Marcia C.  diSessa  Andy  Pea  Roy D.  Songer  Nancy B. 《Journal of Science Education and Technology》1994,3(1):7-15

We contrast the current science education reform effort with the reforms of the 1960s and suggest how the current effort could be enhanced. We identify insights from recent research that we believe can inform the reform process, in particular, to reach all science students and also impart a cohesive view of science. We propose an alternative models view of scientific explanation and show how this view would contribute to reforms of (1) course goals, (2) social aspects of science learning, (3) instructional practices, and (4) roles for technology.This paper summarizes discussions and debates that the authors have had over the last few years. The dialogue stems, in part, from our joint participation in the American Educational Research Association Special Interest Group on Education in Science and Technology (AERA SIG:EST) leadership. This paper communicates the spirit of our thinking and does not necessarily reflect the view of SIG:EST, or any other organization.We gratefully acknowledge the support of National Science Foundation Grant MDR-9253462 in work related to this paper. We appreciate helpful comments from Eileen Lewis and the Computer as Learning Partner group.This material is based upon research supported by the National Science Foundation under grant RED-9155744. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and not necessarily reflect the views of the National Science Foundation.  相似文献   

基于多元线性回归分析方法的物流流通水平研究          下载免费PDF全文

潘新宇  薛洋 《唐山学院学报》2016,29(6):72-77

根据2013年全国31个省市的物流水平相关指标,分别以经营单位所在地分的进出口总额、按境内目的地和货源地分的商品进出口总额作为因变量对物流流通水平进行线性回归分析,得到了多元线性回归模型,由此找出了流通水平的影响因素,并有针对性地提出了对策建议。  相似文献   

横向型GaAs光电导开关超宽带辐射特性研究     

薛红 《渭南师范学院学报》2007,22(2):35-37,56

在实验研究的基础上，根据半导体光电子学理论，对横向型GaAs超快光电导开关的线性和非线性辐射特性作了研究．结果表明：在不同激励光能与偏置电压情况下，光导开关可处于线性与非线性两种导通工作模式；光电导开关的非线性工作模式主要是因为开关中的载流子以电荷畴的形式输运．  相似文献   

线性ε－相关及求解线性方程组的PABS方法   总被引：1，自引：0，他引：1  

王泽辉 《中山大学学报论丛》1996,(5)

给出向量组的线性相关程度的一种定量刻划，提出线性ε－相（无）关的概念以代替经典的线性相（无）关概念，在此基础提出求解一大类线性方程组的新颖方法（称为ＰＡＢＳ方法），在有限步迭代内求出系数矩阵行向量组的ε－秩及ε－等价子方程组，继而求出其最小欧氏模解．方法特别适合于严重病态方程组求解，数值试验结果表明对于高阶Ｈｉｌｂｅｒｔ方程组，数值解精度甚高，优于其他方法．已研制成ＰＡＢＳ方法软件包，可嵌入其他数学软件库中或移植于其他语言或程序系统中  相似文献   

Riccati方程可积的几个充分条件     

黄敬频 《柳州师专学报》1997,12(3):61-63

利用求解变系数二阶齐线性微分方程的方法，出Ｒｉｃｃａｔｉ方程可积的几个充分条件，并举例说明其应用。  相似文献