Teacher,classroom, and student growth orientation in mathematics: A multilevel examination of growth goals,growth mindset,engagement, and achievement

This study examined associations between student- (N = 1414), classroom-, and teacher (N = 91) growth orientation and mathematics engagement and achievement using a multilevel model. Results demonstrated positive associations between student growth orientation and mathematics outcomes and positive associations between classroom and teacher growth orientation and mathematics achievement. There was also a marginally significant interaction effect between classroom and teacher growth orientation on classroom engagement. Findings hold relevance for educational interventions surrounding growth constructs and teachers’ personal growth orientation.     

A multilevel meta-analysis of studies reporting correlations between the h index and 37 different h index variants

This paper presents the first meta-analysis of studies that computed correlations between the h index and variants of the h index (such as the g index; in total 37 different variants) that have been proposed and discussed in the literature. A high correlation between the h index and its variants would indicate that the h index variants hardly provide added information to the h index. This meta-analysis included 135 correlation coefficients from 32 studies. The studies were based on a total sample size of N = 9005; on average, each study had a sample size of n = 257. The results of a three-level cross-classified mixed-effects meta-analysis show a high correlation between the h index and its variants: Depending on the model, the mean correlation coefficient varies between .8 and .9. This means that there is redundancy between most of the h index variants and the h index. There is a statistically significant study-to-study variation of the correlation coefficients in the information they yield. The lowest correlation coefficients with the h index are found for the h index variants MII and m index. Hence, these h index variants make a non-redundant contribution to the h index.     

Effects of a preschool intervention on cognitive development among East-African preschool children: A flexibly time-coded growth model

The aim of the study is to investigate the effects of the Madrasa Resource Center (MRC), a child-centered intervention program, on East-African (Kenya, Zanzibar, and Uganda) preschool children's cognitive development. Altogether 321 children (153 non-intervention and 168 intervention) participated in a cross-sequential study over three time-points during preschool (mean ages 4.3, 6.0, and 7.1 years). A multilevel model (MLM; time-points nested within children nested within schools), in which time was coded flexibly (i.e., child's age operationalized as months from start of the intervention), showed a beneficial curvilinear effect of the intervention program on children's cognitive gains. A moderation analysis suggested that the effect of observed preschool quality (ECERS) was stronger in the intervention program. The findings are discussed within the context of East-African preschool policy.     

称谓选择与语境关系顺应

称谓系统是人类用于识别身份、指代称呼对象以及交际中角色关系定位的特定的语言符号系统。从语用学的角度看 ,称谓的使用是一个顺应语境关系变化的动态的选择过程。称谓的可选择性是由称谓本身所具有的变异性、商讨性和顺应性特性所决定的。称谓的选择是一个过程 ,目的是语境关系的顺应 ,即物理语境、社交语境和心智语境的顺应。称谓选择的语境顺应主要体现在群体定势和个体差异两个方面。     

Full-day kindergarten and student literacy growth: Does a lengthened school day make a difference?

In the context of a quasi-experimental research design, literacy data obtained on students were examined to assess relationships between kindergarten program model (full- vs. half-day) and student literacy outcomes. Application of multilevel modeling techniques to the time series data collected from kindergarteners in economically disadvantaged school contexts in a large southwestern school district revealed that students exposed to a full day of instruction had greater literacy growth than their peers in half-day classrooms. Further examination of the program model results revealed that the relative efficacy of full-day kindergarten tended to be greater in smaller class size environments. These results, if replicated, suggest that full-day kindergarten initiatives targeted toward students from disadvantaged backgrounds may be more successful when implemented in classrooms with relatively small student enrollments. Implications for instructional policy and practice are discussed.     

多层线性建模在CSCL研究中的应用

CSCL研究中常需要处理小组变量和学习者个体变量两种数据,而个体嵌套在小组中,形成两层结构数据。传统的方差分析或线性回归模型仅能针对单层数据,处理多层数据时,易出现标准误差偏移,影响分析的可信度。多层线性建模尽管受CSCL领域样本数的限制,在组层次可能产生偏移量,但能处理稀疏数据,能比较、评估不同层次变异对总变异的贡献度,确定不同层次变量对因变量的影响程度,反映因变量测量随时间变化的发展轨迹,是CSCL领域比较合适的研究方法。     

Parents' Attitudes Towards Science and their Children's Science Achievement

Although countries worldwide are emphasizing the importance of science education for technological development and global economic competition, comparative findings from standardized international student assessments reveal a huge gap in science scores between developed and developing countries. Certain developed economies too have made little progress in raising science achievement over the past decade. Despite school improvement being placed high on the policy agenda, the results of such actions have been poor. Therefore, there is a need to explore additional ways in which science achievement can be enhanced. This study focuses on the family and examines whether parents' attitudes towards science (how much they value science and the importance they place on it) can influence their children's science achievement. Individual- and school-level data are obtained from the Program for International Student Assessment 2006 survey for 15 Organisation for Economic Co-operation and Development (OECD) and non-OECD countries. Hierarchical linear modelling is employed to estimate the equations. The findings indicate that parents' attitudes towards science have a positive and statistically significant effect on science achievement, after controlling for other important student- and school-level variables. Moreover, students from poor backgrounds appear to benefit from more positive parental science attitudes as much as students from high socioeconomic status, such that equality of student achievement is not affected. This study recommends that schools and teachers encourage parents to play a more pro-active role in their children's science education, as well as educate parents about the importance of science and strategies that can be adopted to support their children's science learning.     

Sports Betting and Other Gambling in Athletes,Fans, and Other College Students

Gambling on college and professional sports and the influence of attending colleges with differing levels of “sports interest” were examined among athletes, sports fans, and other students (N = 10,559) at 119 colleges in the United States using multilevel statistical analysis. Athletes and fans reported more sports gambling compared to other students, with no differences between athletes and fans. Male students were more likely to gamble than female students, but gender did not moderate the relationship between athletic participation and sports gambling. Students attending schools with a greater “sports interest” were more likely to gamble on college sports after adjusting for individual characteristics. Athletes, sports fans, and students attending schools with high “sports interest” are appropriate targets for prevention efforts.     

试论池莉写实小说的美学意义

“新写实小说”的代表作家池莉，以其独具个性的视角，在庸常中反映生活并进行多层面探究。使其创作呈现出独特的美学境界。     

Applications of cascade multilevel inverters

Cascade multilevel inverters have been developed for electric utility applications. A cascade M-level inverter consists of (M-1)/2 H-bridges in which each bridge's dc voltage is supported by its own dc capacitor. The new inverter can: (1) generate almost sinusoidal waveform voltage while only switching one time per fundamental cycle; (2) dispense with multi-pulse inverters' transformers used in conventional utility interfaces and static var compensators; (3) enables direct parallel or series transformer-less connection to medium- and high-voltage power systems. In short, the cascade inverter is much more efficient and suitable for utility applications than traditional multi-pulse and pulse width modulation (PWM) inverters. The authors have experimentally demonstrated the superiority of the new inverter for power supply, (hybrid) electric vehicle (EV) motor drive, reactive power (var) and harmonic compensation. This paper summarizes the features, feasibility, and control schemes of the cascade inverter for utility applications including utility interface of renewable energy, voltage regulation, var compensation, and harmonic filtering in power systems. Analytical, simulated, and experimental results demonstrated the superiority of the new inverters.