Testing Factorial Invariance in Multilevel Data: A Monte Carlo Study

Testing factorial invariance has recently gained more attention in different social science disciplines. Nevertheless, when examining factorial invariance, it is generally assumed that the observations are independent of each other, which might not be always true. In this study, we examined the impact of testing factorial invariance in multilevel data, especially when the dependency issue is not taken into account. We considered a set of design factors, including number of clusters, cluster size, and intraclass correlation (ICC) at different levels. The simulation results showed that the test of factorial invariance became more liberal (or had inflated Type I error rate) in terms of rejecting the null hypothesis of invariance held between groups when the dependency was not considered in the analysis. Additionally, the magnitude of the inflation in the Type I error rate was a function of both ICC and cluster size. Implications of the findings and limitations are discussed.     

Acculturation strategies, social support, and cross-cultural adaptation: a mediation analysis

Previous acculturation research has established the influences of acculturation strategies and social support on cross-cultural adaptation. The present study attempted to elaborate these direct associations by proposing that social support and the use of the integration and marginalization strategies might affect psychological adaptation indirectly, via their influences on sociocultural adaptation. Two hundred and twelve Mainland Chinese students studying at a university in Hong Kong completed measures of psychological and sociocultural adaptation, the integration and marginalization strategies, and social support. Analyses using structural equation modeling (SEM) showed that sociocultural adaptation significantly mediated the effects of integration, marginalization, and social support on psychological adaptation. The direct impacts of social support and the two acculturation strategies on psychological adaptation were not significant. A multigroup SEM analysis revealed no gender differences in the full mediation model. Implications of the findings are discussed.     

All-aqueous multiphase microfluidics

Immiscible aqueous phases, formed by dissolving incompatible solutes in water, have been used in green chemical synthesis, molecular extraction and mimicking of cellular cytoplasm. Recently, a microfluidic approach has been introduced to generate all-aqueous emulsions and jets based on these immiscible aqueous phases; due to their biocompatibility, these all-aqueous structures have shown great promises as templates for fabricating biomaterials. The physico-chemical nature of interfaces between two immiscible aqueous phases leads to unique interfacial properties, such as an ultra-low interfacial tension. Strategies to manipulate components and direct their assembly at these interfaces needs to be explored. In this paper, we review progress on the topic over the past few years, with a focus on the fabrication and stabilization of all-aqueous structures in a multiphase microfluidic platform. We also discuss future efforts needed from the perspectives of fluidic physics, materials engineering, and biology for fulfilling potential applications ranging from materials fabrication to biomedical engineering.     

Developing a Scale to Measure Students’ Attitudes toward Chemistry Lessons

Students’ attitudes toward chemistry lessons in school are important dependent variables in curriculum evaluation. Although a variety of instruments have been developed by researchers to evaluate student attitudes, they are plagued with problems such as the lack of theoretical rationale and of empirical evidence to support the construct validity of data. This paper describes a study of students’ attitudes toward chemistry lessons in Hong Kong secondary schools. One of the scales in the Test of Science‐Related Attitudes developed by Fraser was modified to form an Attitude Toward Chemistry Lessons Scale (ATCLS). The construction of the ATCLS was based on a theoretical model with four dimensions: liking for chemistry theory lessons, liking for chemistry laboratory work, evaluative beliefs about school chemistry, and behavioural tendencies to learn chemistry. The arguments for inclusion of these four dimensions are presented. The final version of ATCLS was administered to 954 students. The results of confirmatory factor analysis indicated that there was a good fit between the hypothesised model and the observed data.     

Integrating media education into liberal studies: a positive response to curriculum reform in Hong Kong

Media education has been around for quite some time in the West (Bazalgette et al. 1990 Bazalgette, C., Bevort, E. and Savino, J. 1990. New directions: Media education worldwide, London: BFI.  [Google Scholar]), but it only started to gain acceptance in Asia (Cheung 2005 Cheung, C. K. 2005. Media education in Hong Kong: From civic education to curriculum reform. The Asia-Pacific Education Researcher, 14(1): 27–45.  [Google Scholar]), particularly in Hong Kong, in the last decade. Recently, it has been gaining more attention in Hong Kong thanks to the curriculum reform in which liberal studies will become one of the four core subjects to be taken by students in the New Senior Secondary Curriculum and media is one of the six themes to be studied in the subject of liberal studies. This article argues for the need for teaching media education in liberal studies and shows the many connections between the two subjects that facilitate this integration.     

Validation of a 'spurning scale' for teachers: the Chinese sample

The present study represents our continuing effort to validate a 'spurning scale' for teachers, based on a model of spurned helpers' reactions. Three approaches were used to examine the construct validity of the scale: the spurning scores of teachers working with more achieving students versus the scores of teachers teaching less achieving students; the relationships between the spurning scores and job satisfaction and turnover scores; and the relationships between the spurning scores and scores indicative of stress arising from interactions with one's students, and with one's supervisor. Serving teachers in Guangzhou (China) responded to a questionnaire containing the variables of interests. Overall, the results provided further evidence for the validity of the scale.     

Involving parents in paired reading with preschoolers: Results from a randomized controlled trial

A paired reading program was implemented for 195 Hong Kong preschoolers (mean age = 4.7 years) and their parents from families with a wide range of family income. The preschoolers were randomly assigned to experimental or waitlist control groups. The parents in the experimental group received 12 sessions of school-based training on paired reading in 7 weeks. They were required to do paired reading with their children for at least four times in each of these 7 weeks. At the end of the program, the preschoolers in the experimental group had better performance in word recognition and reading fluency than their counterparts in the control group. They were also reported as more competent and motivated in reading by their parents. More importantly, the program had many favorable effects on parents. Parents in the experimental group had higher self-efficacy in helping their children to be better readers and learners. They also reported that they had better relationships with their children. Their changes in relationships and self-efficacy were found to mediate the program impact on some of the child outcomes. However, family income did not moderate the effectiveness of the program. Families with high and low income both benefited from the program alike.     

Students’ Attitudes Toward Chemistry Lessons: The Interaction Effect between Grade Level and Gender

The purpose of this quantitative study was to examine the interaction effect between grade level and gender with respect to students' attitudes toward chemistry lessons taught in secondary schools. The sample consisted of 954 chemistry students in grades Secondary 4–7 (approximately 16–19 years of age) in Hong Kong. Students' attitudes were surveyed using an attitude toward chemistry lessons scale (ATCLS), and subscale scores were produced on four dimensions: liking for chemistry theory lessons; liking for chemistry laboratory work; evaluative beliefs about school chemistry; and behavioral tendencies to learn chemistry. When the ATCLS data were subjected to two-way MANOVA, the interaction effect between grade level and gender on students' attitudes toward chemistry lessons was statistically significant. The interaction effect was attributable to scores on the theory lessons subscale and laboratory work subscale. Male students in Secondary 4 and 5 liked chemistry theory lessons more than their female counterparts. However, male students' liking for chemistry laboratory work declined when they progressed from Secondary 4 to Secondary 7; no such a significant decline in attitude toward chemistry laboratory work was found in females. Overall, both males and females were just marginally positive about chemistry lessons during the years of secondary schooling. Implications of these findings for curriculum design are discussed.     

Source localization using TDOA and FDOA measurements based on semidefinite programming and reformulation linearization

The problem of source localization using time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) measurements has been widely studied. It is commonly formulated as a weighted least squares (WLS) problem with quadratic equality constraints. Due to the nonconvex nature of this formulation, it is difficult to produce a global solution. To tackle this issue, semidefinite programming (SDP) is utilized to convert the WLS problem to a convex optimization problem. However, the SDP-based methods will suffer obvious performance degradation when the noise level is high. In this paper, we devise a new localization solution using the SDP together with reformulation-linearization technique (RLT). Specifically, we firstly apply the RLT strategy to convert the WLS problem to a convex problem, and then add the SDP constraint to tighten the feasible region of the resultant formulation. Moreover, this solution is also extended for cases when there are sensor position and velocity errors. Numerical results show that our solution has significant accuracy advantages over the existing localization schemes at high noise levels.