Thermal mixing of two miscible fluids in a T-shaped microchannel     

Xu B  Wong TN  Nguyen NT  Che Z  Chai JC 《Biomicrofluidics》2010,4(4):44102

In this paper, thermal mixing characteristics of two miscible fluids in a T-shaped microchannel are investigated theoretically, experimentally, and numerically. Thermal mixing processes in a T-shaped microchannel are divided into two zones, consisting of a T-junction and a mixing channel. An analytical two-dimensional model was first built to describe the heat transfer processes in the mixing channel. In the experiments, de-ionized water was employed as the working fluid. Laser induced fluorescence method was used to measure the fluid temperature field in the microchannel. Different combinations of flow rate ratios were studied to investigate the thermal mixing characteristics in the microchannel. At the T-junction, thermal diffusion is found to be dominant in this area due to the striation in the temperature contours. In the mixing channel, heat transfer processes are found to be controlled by thermal diffusion and convection. Measured temperature profiles at the T-junction and mixing channel are compared with analytical model and numerical simulation, respectively.  相似文献   

Maintaining teachers’ face in the context of change: results from a study of Vietnamese college lecturers’ perceptions of face     

Thi Quynh Trang Nguyen 《Teachers and Teaching》2017,23(1):78-90

Gaining and saving face are very important in Vietnam as a mechanism of social control, including the professional behaviour of teachers. Interviews with 15 lecturers (aged 24–37) at a teacher training college in a Central Coast province of Vietnam illustrated the relationship between their concepts of face and their beliefs about good teaching. Most were still strongly influenced by traditional Confucian beliefs about the role and position of teachers, the nature of teachers’ knowledge and the relationship between teachers and students. On the other hand, some teachers also were aware of, and to a limited extent open to, more modern ideas that seemed to be related to broad social changes and reforms in approaches to teaching and learning in recent decades in Vietnam. The findings suggest that some teacher educators are uncertain about the value of traditional professional wisdom in the context of critical changes in society and in education. The research also suggests that the concepts of face and saving face are important for teachers’ sense of agency, and that Vietnamese educational authorities could increase the effectiveness of innovations in teacher education by paying attention to the influence of concepts of face on the teachers’ beliefs and behaviours.  相似文献   

Socio-scientific reasoning and environmental literacy in a field-based ecology class     

Andrew T. Kinslow  Troy D. Sadler  Hai T. Nguyen 《Environmental Education Research》2019,25(3):388-410

The complex environmental challenges humanity faces require citizens who are scientifically and environmentally literate. Many environmental education programs are situated in the field where students are immersed in their learning. These field-based activities are engaging but may lack opportunities for students to develop critical thinking and reasoning skills necessary to be environmentally literate. We suggest a socio-scientific issue (SSI) based teaching approach can increase epistemic engagement and lead to student gains in scientific and environmental literacy. This study describes how we modified an existing field-based ecology course, framing the learning around a local environmental socio-scientific issue. We used a convergent parallel mixed-methods approach to examine the changes in socio-scientific reasoning (SSR) over time for high school students in this course as a measure of scientific and environmental literacy. Results indicate that a focused SSI field-based environmental education curriculum can support development of socio-scientific reasoning and environmental literacy competencies among high school students.  相似文献   

Competition as cooperation     

C. Thi Nguyen 《体育哲学杂志》2017,44(1):123-137

Games have a complex, and seemingly paradoxical structure: they are both competitive and cooperative, and the competitive element is required for the cooperative element to work out. They are mechanisms for transforming competition into cooperation. Several contemporary philosophers of sport have located the primary mechanism of conversion in the mental attitudes of the players. I argue that these views cannot capture the phenomenological complexity of game-play, nor the difficulty and moral complexity of achieving cooperation through game-play. In this paper, I present a different account of the relationship between competition and cooperation. My view is a distributed view of the conversion: success depends on a large number of features. First, the players must achieve the right motivational state: playing for the sake of the struggle, rather than to win. Second, successful transformation depends on a large number of extra-mental features, including good game design, and social and institutional features.  相似文献   

Micro-optofluidic Lenses: A review   总被引：2，自引：0，他引：2  

Nam-Trung Nguyen 《Biomicrofluidics》2010,4(3)

This review presents a systematic perspective on the development of micro-optofluidic lenses. The progress on the development of micro-optofluidic lenses are illustrated by example from recent literature. The advantage of micro-optofluidic lenses over solid lens systems is their tunability without the use of large actuators such as servo motors. Depending on the relative orientation of light path and the substrate surface, micro-optofluidic lenses can be categorized as in-plane or out-of-plane lenses. However, this review will focus on the tunability of the lenses and categorizes them according to the concept of tunability. Micro-optofluidic lenses can be either tuned by the liquid in use or by the shape of the lens. Micro-optofluidic lenses with tunable shape are categorized according to the actuation schemes. Typical parameters of micro-optofluidic lenses reported recently are compared and discussed. Finally, perspectives are given for future works in this field.  相似文献   

Relationship of blood cholesterol to body composition, physical fitness, and dietary intake measures in third-grade children and their parents     

Hopper CA  Gruber MB  Munoz KD  MacConnie SE  Pfingston YM  Nguyen K 《Research quarterly for exercise and sport》2001,72(2):182-188

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Proteolysis of Sardine (Sardina pilchardus) and Anchovy (Stolephorus commersonii) by Commercial Enzymes in?Saline Solutions     

Chau Minh Le  Claire Donnay-Moreno  Sandrine Bruzac  Régis Baron  Huong Thi My Nguyen  Jean Pascal Bergé 《Food Technology and Biotechnology》2015,53(1):87-90

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Instructional leadership practices in Singapore   总被引：1，自引：0，他引：1  

Foo Seong David Ng  Thanh Dong Nguyen  Koon Siak Benjamin Wong  Kim Weng William Choy 《School Leadership & Management》2015,35(4):388-407

This paper presents a review of the literature on principal instructional leadership in Singapore. The authors investigated the dimensions of instructional leadership in the practices of Singapore principals and highlighted the strategies these leaders adopt to enact their instructional roles. Singapore principals were found to play an active role in defining the school vision and promoting the school climate. However, in the areas of curriculum implementation and classroom instruction, the middle management team in the school played more active roles as compared to principals. Five broad conclusions were discussed to provide perspectives on instructional leadership practices in Singapore. This paper also highlighted limitations on current instructional leadership research in Singapore and pointed to areas of future research.  相似文献   

Is graduate employability the ‘whole-of-higher-education-issue’?     

Thi Tuyet Tran 《Journal of Education & Work》2015,28(3):207-227

Graduate employability has become an issue in Vietnam since many university students do not satisfy the needs of employers. Universities often receive the strongest criticism on the poor employability assets graduates possess. The ill-preparation of university graduates is considered the result of the out dated and irrelevant curriculum in the higher education system, of the traditional teaching methods and the absent of career guidance in most universities. This article, however, aims to challenge this common criticism that university is to blame for the ill-preparation for employment of its graduates. By conducting a qualitative research inviting the voices of both students and employers on the issue, this article wants to address a wider context and circumstance and also the related issues surrounding the transition from university to work of Vietnamese university graduates. It suggests that not only universities, but also students, employers and other related stakeholders (i.e. student’s family, government and educational policy makers) should acknowledge the changes in society, should be aware of the cultural features at work, and should see their responsibility in the process. They all should make an effort to create mutual understanding, to collaborate and to enhance the development of graduate employability in the Vietnamese context.  相似文献   

Reading attitudes in Vietnam: Initial study of the early school years     

Ho  Tien Thuy  Pham  Giang T.  Dam  Quynh 《Reading and writing》2022,35(2):303-323

Whereas cognitive and linguistic factors for learning to read have been extensively studied, less is known about affective factors including children’s attitudes toward reading. Studies primarily from English-speaking and Western countries show gradual declines in reading attitudes in elementary school (McKenna et al., Reading Research Quarterly 30:626–639, 1995) and a positive association between reading attitudes and achievement (Petscher, Journal of Research in Reading 33:335–355, 2010). Children from Asian and African countries are underrepresented in this literature; whether these patterns can be generalized across cultures needs further investigation. This longitudinal study examined the reading attitudes of 84 children in Vietnam from grades 1 to 2 and their relations to reading performance, as measured by translated and adapted versions of the Elementary Reading Attitude Survey and Early Grade Reading Assessment, respectively. This sample from Vietnam showed a small decline in reading attitudes over time, particularly in attitudes toward academic reading. However, children on average reported feeling happy about reading in both grades. Correlations revealed different patterns of association between reading attitudes and performance based on the reading measure employed, grade level, and type of reading in question (academic versus recreational). In grade 2, reading attitudes explained unique variance in reading comprehension even after text fluency and mother’s education were considered. We present a margins plot to visualize the role of reading attitudes on reading comprehension. We discuss educational implications and future directions.

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