Plug-in nanoliter pneumatic liquid dispenser with nozzle design flexibility

This paper presents a novel plug-in nanoliter liquid dispensing system with a plug-and-play interface for simple and reversible, yet robust integration of the dispenser. A plug-in type dispenser was developed to facilitate assembly and disassembly with an actuating part through efficient modularization. The entire process for assembly and operation of the plug-in dispenser is performed via the plug-and-play interface in less than a minute without loss of dispensing quality. The minimum volume of droplets pneumatically dispensed using the plug-in dispenser was 124 nl with a coefficient of variation of 1.6%. The dispensed volume increased linearly with the nozzle size. Utilizing this linear relationship, two types of multinozzle dispensers consisting of six parallel channels (emerging from an inlet) and six nozzles were developed to demonstrate a novel strategy for volume gradient dispensing at a single operating condition. The droplet volume dispensed from each nozzle also increased linearly with nozzle size, demonstrating that nozzle size is a dominant factor on dispensed volume, even for multinozzle dispensing. Therefore, the proposed plug-in dispenser enables flexible design of nozzles and reversible integration to dispense droplets with different volumes, depending on the application. Furthermore, to demonstrate the practicality of the proposed dispensing system, we developed a pencil-type dispensing system as an alternative to a conventional pipette for rapid and reliable dispensing of minute volume droplets.     

Children’s Home Numeracy Environment Predicts Growth of their Early Mathematical Skills in Kindergarten

This study investigated the longitudinal associations between children’s early mathematics and their home numeracy environment (HNE). Chilean children from families who varied widely in socioeconomic status were assessed at the beginning and end of prekindergarten in 2016 (N = 419, M_age = 4:7 [years:months]), and at the end of kindergarten in 2017 (N = 368, M_age = 5:10). Children whose parents provided frequent operational numeracy activities (e.g., learning simple sums) at prekindergarten showed better arithmetic performance and growth in nonsymbolic and symbolic number comparison at the end of kindergarten. Parents’ knowledge of number-related games predicted children’s arithmetic skills and growth in nonsymbolic number comparison. These findings underscore the persistent relations between the HNE and the development of children’s mathematical skills.     

Six elements for technology integration in multicultural classrooms

Abstract

Although the number of computers in American schools multiplies, educational inequity remains evident in the area of technology. The socio-economically disadvantaged, the physically disabled, and the culturally and linguistically different have limited knowledge of and experiences with technology. Equitable access to technology requires the infusion of effective multicultural teaching strategies into educational technology use. These strategies must be broad enough to be inclusive of diverse learners, yet specific enough to be valuable as a guide to multicultural teaching. Similarly, they should allow for individual creativity and personal differences in teaching and learning. In this paper, the author proposes and defines six elements for integrating technology in culturally diverse classrooms: cultural awareness, cultural relevance, culturally supportive environment, equitable access, instructional flexibility, and instructional integration. These six elements are based on research on effective teaching of diverse students. They are not exhaustive of good instructional practices for technology use with diverse learners. Nevertheless, the author found their application in the evaluation of 32 technology-integrated units both informative and effective in identifying how teachers integrated computers for diverse learners. The author recognizes the need for further validation of these criteria and for research on effective teacher use of technology in multicultural settings.     

Standards-based performance assessment for the evaluation of student teachers: a consequential validity study

The instrument Samples of Teaching Performance (STP) was developed to assess student teachers' capacity to plan, deliver and evaluate a unit of instruction. The current study reports consequential validity data collected from supervisors (n?=?20) and student teachers (n?=?62) from three elementary and five secondary teacher preparation programs in Chile that participated in the field-testing of the STP. Student teachers described how this assessment had honed their sense of professionalism and promoted learning of the skills assessed. Supervisors reported enlarging the topics discussed with student teachers and making some changes to the supervisory process. These findings are complemented by an analysis of the STP scores obtained by 24 student teachers, which showed better development of instructional skills when compared to pedagogical reasoning and reflection. These results raise questions about the structure of student teaching to support the implementation of standards-based assessments that entail tasks at different levels of cognitive complexity.     

Understanding customer satisfaction and loyalty: An empirical study of mobile instant messages in China

With the rapid development of mobile technology and large usage rates of mobile phones, mobile instant message (MIM) services have been widely adopted in China. Although previous studies on the adoption of mobile services are quite extensive, few focus on customer satisfaction and loyalty to MIM in China. In this study, we examine the determinants of customer satisfaction and loyalty. The findings confirm that trust, perceived service quality, perceived customer value, including functional value and emotional value, contribute to generating customer satisfaction with MIM. The results also show that trust, customer satisfaction and switching cost directly enhance customer loyalty. Additionally, this study finds that age, gender, and usage time have moderating effects. Finally, implications for the marketing of MIM are discussed.     

Construction and Validation of a Chinese Value of Learning Scale (CVLS)

The Chinese Value of Learning Scale (CVLS) is a 5-item instrument for assessing the value of learning in Chinese culture. The psychometric properties of CVLS were investigated in a convenient sample of 583 Chinese soon-to-be-aged adults in Hong Kong. CVLS possesses high internal consistency and exhibited satisfactory short-term test-retest reliability. CVLS also exhibited high face validity and mild convergent validity with other 48-item openness-to-experience scale (OTES) from Revised NEO Personality Inventory, and is significantly related to the past and actual learning experience. In view of its brevity and easy administration, CVLS offers a useful instrument to further investigate the value of learning in Chinese culture and its possible relationship with adults' learning behaviour.     

Transforming collaborative writing tasks into opportunities for learning: educational assistance and the use of rubrics in Higher Education / Transformando las tareas de escritura colaborativa en oportunidades para aprender: ayuda educativa y uso de rúbricas en la Educación Superior

Abstract

This study, framed within a socio-cultural perspective of teaching that sees collaborative writing as a learning instrument, presents an innovative teaching experience related to the use of collaborative writing tasks to foster learning, combining face-to-face and online group work sessions. The study was conducted with the participation of 13 students — organised into three different groups — taking a subject of a Master’s degree in Psychology of Education, and the two teachers responsible for delivering the subject. The results of the experience have highlighted the need to provide different learning assistance which is not solely aimed at managing meaning, but also at managing the task itself and the participation in it. The results also show the importance of embedding such assistance in the design as well as the development of the instructional process. Among the different forms of assistance available, the data show the benefits of using rubrics as tools to support the shared understanding of tasks by teachers and students and as a tool to support learning. Finally, results show that the collaborative writing tasks carried out throughout the course have been useful both for learning the content and for developing the abilities required for managing the students’ own joint activity.     

A study of Korean middle school students’ interests in biology and their implications for biology education

This study analyses middle school students’ interests in biology to provide information on instructional strategies and curriculum development in Korea. An instrument that measures interests was developed based on the middle school biology curriculum. It consists of 64 three‐point Likert‐type items (scores range from 0 to 2). The two components, ‘topic’ and ‘activity’, are composed of 64 items. The topic component and the activity component contain 11 domains and six domains respectively. Data were collected from 267 middle school students in Seoul (male: 169, female: 107). The levels of interest in topic and activity were almost the same and not high. The highest interest domains were ‘genetics’ in topics and ‘observing through a microscope’ in activities. The interest levels in the domain ‘plant morphology’ and ‘plant‐related activity’ were the lowest in each component. The interest level of the eighth graders was the highest found among students. Interest levels of females were lower than those of males in ‘environment and ecosystem’, ‘animal reproduction’ and ‘animal morphology’, but higher in ‘plant morphology’ and ‘plant related activity’ (p < 0.05). Among the topics, the ‘human biology’ domain correlated positively with the domains ‘genetics’, ‘environment and ecosystem’ and ‘respiration of animal and plant’. The correlation between the domains of ‘plant reproduction and nutrition’ and ‘plant development’ was significant in ‘activity’ (r > 0.50, p < 0.001). Consistencies in interests were suggested with respect to instructional strategy and curriculum design.