The context dependence of physics identity: Examining the role of performance/competence,recognition, interest,and sense of belonging for lower and upper female physics undergraduates

While there is a growing body of work that examines disciplinary identity development, unlike qualitative work in this area, quantitative research has not fully incorporated the importance of different contexts, nor has it uniquely focused on underrepresented groups (in this case, women in physics). This study examines how the constructs posited by prior work as important for physics identity, as well as an additional theorized construct, may interrelate and affect female students' physics identity differently depending on the context. Context in this study refers to two different experiential levels in college. The constructs examined include performance/competence, recognition, and interest, as well as sense of belonging. In particular, we used structural equation modeling to examine the effect that these constructs have on the physics identity of two groups of female physics undergraduates: first year students and senior year students. The results reveal that the relationship of the theorized constructs with physics identity vary between the two groups as well as compared to prior research with broad college student populations (not just physics majors). Unlike broad college student populations, for our sample of female physics undergraduates, interest did not have a direct effect on physics identity while sense of belonging was significant only for senior year students. These results exemplify the importance of examining context or different types of student experiences when studying disciplinary identity development rather than generalizing previous frameworks to all contexts.     

Role of teacher-related factors and educational resources in science literacy: An international perspective

The study evaluated the relationship among teaching, leadership, teacher certification, student and teacher number related factors, and index of economic, social and cultural status (ESCS), and science literacy from an international comparative perspective. 2015 dataset of the Programme for International Student Assessment for Turkey, Singapore, the United States, Korea, Italy, and Brazil was used. Two-level hierarchical linear models were established for analysis. Results revealed that school ESCS was the best predictor of science literacy across six countries and additionally teacher-related factors came to the forefront of science literacy performance. The study underlined policymakers should focus primarily on policies that increase equity in education. Furthermore, the effectiveness of investments made in factors related to leadership, teacher certification, the number of students and teachers, which contribute very little to science literacy performance, need to be more questioned. Inferences about the findings were discussed in detail, and recommendations for further research were made.     

Searching for the impact of teacher behavior on promoting students’ cognitive and metacognitive skills

This study investigates the impact of teaching factors on students’ cognitive and metacognitive achievement in mathematics. Written tests and the “Metacognitive Skills and Knowledge Assessment” tool were administered to grade 4 and 5 students (n = 924) at the beginning and end of the school year 2013-2014. A student questionnaire was used for measuring teaching factors. Multilevel SEM analyses revealed a reciprocal relationship between students’ cognitive and metacognitive skills. All teaching factors of the dynamic model of educational effectiveness were found to be associated with mathematics achievement but only four factors (modeling, assessment, questioning, and dealing with misbehavior) were associated with two aspects of metacognition (i.e. prediction and evaluation). Implications of findings are drawn.     

差序氛围感知对员工创新绩效的影响研究——个体学习和隐性知识共享的作用

基于差序格局理论和成就动机理论,构建差序氛围感知与员工创新绩效的概念模型.利用结构方程模型对353份员工调查问卷进行分析,结果表明:(1)差序氛围感知的3个维度——相互依附、偏私对待和亲信角色对员工创新绩效有显著正向影响;(2)个体学习能够显著正向预测员工创新绩效,并在相互依附、偏私对待和亲信角色对员工创新绩效的影响中...     

以能力培养为主线论常微分方程课的教学

以微分方程的教学实践为背景,运用现代教学法的基本理论与观点,阐述了在微分方程教学中对学生能力素质培养的若干见解。     

一类随机微分效用的风险厌恶性

通过倒向重随机微分方程引入了一类随机微分效用,讨论其风险厌恶性。     

谈视觉思维在广场体育艺术中的运用

文章运用文献资料法、事例分析法、综合论述法等研究方法,对视觉思维模式及其在广场体育艺术中的运用进行研究,为广场体育艺术这种大型表演的编排和设计找到一些突破口,开阔设计者的想象空间,调动他们思维的积极性,打破常规的思维方式,提高创编者的创造力和想象力,从而设计出具有较高艺术性和地方特色,且与众不同的大型运动会开闭幕式表演。     

改进的余弦形超声变幅杆

本文推导了改进的余弦形超声变幅杆的频率方程、各参数的计算公式,并与其它类型的变幅杆进行了比较．结果表明此类变幅杆具有和指数形变幅杆相同的放大系数和频率方程,也适合于作为单一的变幅杆使用;并且其输入阻抗的表达式比指数形、圆锥形、悬链线形的都要简捷;在面积系数不太大的情况下,其形状因数比指数形、圆锥形、悬链线形的大得多。     

Optimal filtering over linear observations with unknown parameters

This paper presents the optimal filtering and parameter identification problem for linear stochastic systems over linear observations with unknown parameters, where the unknown parameters are considered Wiener processes. The original problem is reduced to the filtering problem for an extended state vector that incorporates parameters as additional states. The resulting filtering system is bilinear in state and linear in observations. The obtained optimal filter for the extended state vector also serves as the optimal identifier for the unknown parameters. Performance of the designed optimal state filter and parameter identifier is verified for both, positive and negative, parameter values.     

Bounds for characteristic exponents of discrete linear time varying systems

In this paper we introduce certain constants that characterize exponential stability or exponential unstability of discrete linear time varying systems. We also present bounds for Lyapunov and Perron exponents in terms of the introduced constants.