Optofluidic planar reactors for photocatalytic water treatment using solar energy     

Lei L  Wang N  Zhang XM  Tai Q  Tsai DP  Chan HL 《Biomicrofluidics》2010,4(4):43004

Optofluidics may hold the key to greater success of photocatalytic water treatment. This is evidenced by our findings in this paper that the planar microfluidic reactor can overcome the limitations of mass transfer and photon transfer in the previous photocatalytic reactors and improve the photoreaction efficiency by more than 100 times. The microreactor has a planar chamber (5 cm×1.8 cm×100 μm) enclosed by two TiO(2)-coated glass slides as the top cover and bottom substrate and a microstructured UV-cured NOA81 layer as the sealant and flow input∕output. In experiment, the microreactor achieves 30% degradation of 3 ml 3×10(-5)M methylene blue within 5 min and shows a reaction rate constant two orders higher than the bulk reactor. Under optimized conditions, a reaction rate of 8% s(-1) is achieved under solar irradiation. The average apparent quantum efficiency is found to be only 0.25%, but the effective apparent quantum efficiency reaches as high as 25%. Optofluidic reactors inherit the merits of microfluidics, such as large surface∕volume ratio, easy flow control, and rapid fabrication and offer a promising prospect for large-volume photocatalytic water treatment.  相似文献   

Release monitoring of single cells on a microfluidic device coupled with fluorescence microscopy and electrochemistry     

Shi BX  Wang Y  Lam TL  Huang WH  Zhang K  Leung YC  Chan HL 《Biomicrofluidics》2010,4(4):43009

A method for monitoring the biological exocytotic phenomena on a microfluidic system was proposed. A microfluidic device coupled with functionalities of fluorescence imaging and amperometric detection has been developed to enable the real-time monitoring of the exocytotic events. Exocytotic release of single SH-SY5Y neuroblastoma cells was studied. By staining the cells located on integrated microelectrodes with naphthalene-2,3-dicarboxaldehyde, punctuate fluorescence consistent with localization of neurotransmitters stored in vesicles was obtained. The stimulated exocytotic release was successfully observed at the surface of SH-SY5Y cells without refitting the commercial inverted fluorescence microscope. Spatially and temporally resolved exocytotic events from single cells on a microfluidic device were visualized in real time using fluorescence microscopy and were amperometrically recorded by the electrochemical system simultaneously. This coupled technique is simple and is hoped to provide new insights into the mechanisms responsible for the kinetics of exocytosis.  相似文献   

促进跨学科研究的有效组织模式研究——基于斯坦福大学Bio-x跨学科研究计划的分析及启示   总被引：2，自引：0，他引：2       下载免费PDF全文

陈勇  邹晓东  陈艾华  陈婵  王锋雷  柳宏志 《科学学研究》2010,28(3):346-350

跨学科研究是当代高校适应和服务于经济社会及科学技术发展的重要途径,如何有效组织跨学科研究是摆在高校面前的重大现实课题之一。美国斯坦福大学Bio-x计划在跨学科研究的管理体制和运行机制方面进行了积极的探索和实践,取得了显著成效,包括科学的跨学科战略规划、创新创业的组织文化、有效的跨学科研究平台、实体运作的体制及项目驱动的机制、与产业界紧密联系等成为其成功的关键因素。本文对斯坦福大学B io-x跨学科研究计划进行深入研究和分析,旨在为中国高校跨学科研究的有效组织提供借鉴。  相似文献   

Emotional autonomy and perceived parenting styles: relational analysis in the Hong Kong cultural context     

Kwok Wai Chan  Siu Mui Chan 《Asia Pacific Education Review》2009,10(4):433-443

Three hundred and seven teacher education students of a Hong Kong university were administered two questionnaires, one measuring emotional autonomy (EAS) and the other measuring perceived parenting styles (PAQ) of their parents. It was found that the Hong Kong teacher education students tended to be autonomous and they characterized their parents as authoritative instead of authoritarian. In addition, the emotional autonomy scale was positively related to authoritarianism, but negatively related to authoritativeness and permissiveness of parenting. Emotional detachment instead of autonomy seemed to be a more appropriate meaning of EAS for the interpretation of results. Implications were drawn for future research including development of an improved instrument in measuring emotional autonomy to study its associations with perceived parenting styles of young people across cultures.  相似文献   

The Political Consequences of Ambivalence: The Case of Democratic Reform in Hong Kong     

Lee  Francis L. F.; Chan  Joseph Man 《Int. Journal of Public Opinion Research》2009,21(1):47-64

Recent research has shown that attitudinal ambivalence has importantimplications on political attitudes and behavior. The conceptholds one of the keys to understanding complicated and seeminglycontradictory opinions of the public. This article examinesambivalence in public opinion regarding democratic reform inHong Kong. Analysis of a representative survey (N = 600) showsthat common citizens indeed have a significant degree of ambivalencetoward the government's political reform bill proposed in 2005.Regarding consequences, objective ambivalence is shown to havegreater predictive power than subjective ambivalence. The formerrelates negatively to attitude extremity and weakens the attitude–behaviorlinkage. However, contrary to the usual finding in the literature,objective ambivalence also relates positively to protest participationintention. The theoretical and social implications of the findingsare discussed. Received for publication June 29, 2007. Accepted for publication October 8, 2008.  相似文献   

基于STP的大学出版物市场创新性研究     

崔明  宋婵 《出版科学》2009,17(2)

基于市场营销学中的理论STP[1]分析,认为大学出版社应当运用"市场再细分、目标市场再选择、市场再定位"的新方法挖掘市场机会.在市场再细分中,提出多方位市场分析模型;在目标市场再选择中,提出3个可供开发的新市场;在市场再定位中,创新性地提出大学出版社的"蓝海型长尾战略'.  相似文献   

Education,gender and Islam in China: The place of religious education in challenging and sustaining ‘undisputed traditions’ among Chinese Muslim women     

Maria Jaschok  Hau Ming Vicky Chan 《International Journal of Educational Development》2009

The essay investigates the place of religious and secular education in the lives of Chinese Muslim women. Education is treated as a site where state and society are reproduced and/or challenged, where tensions arise over control of minds and bodies, and over interpretations and uses of religion and culture. Specifically, the essay compares contrastive situations of female religious education within a matrix of inter-dependent issues such as the diversity of Muslim contexts in China, state treatment of minorities’ rights to religious practice and to education, organisation and implementation of religious education, and relations between secular education and Islamic education.  相似文献   

Problem-based learning and the development of metacognition   总被引：1，自引：0，他引：1  

Kevin Downing  Theresa Kwong  Sui-Wah Chan  Tsz-Fung Lam  Woo-Kyung Downing 《Higher Education》2009,57(5):609-621

This study samples first year undergraduates from two programmes at a Hong Kong University (N = 66). One programme uses an entirely problem-based approach to learning and teaching, whilst the other uses more traditional methods. Using the Learning and Study Strategies Inventory (LASSI) as a measure of student perceptions of their thinking, or metacognition it explores differences in metacognitive development between each group of students between the beginning and end of their first year in each programme. The paper argues that, in addition to the formal learning context, everyday challenges emerging from the additional new social contexts provided by problem-based curricula provide fertile environments for the development of metacognition because whilst the highest ‘meta-level’ of cognition is usually not implicated when we receive an outside task and when the task solution is known, the meta-level does tend to be consulted when things go wrong or when the situation is new. In other words, when we are faced with finding solutions to a problem whether posed by the teacher as part of a problem-based curriculum or a new social environment, we are more likely to develop generic, as well as subject specific skills.  相似文献   

Undergraduates’ learning experience and learning process: quantitative evidence from the East   总被引：2，自引：0，他引：2  

Beverley J. Webster  Wincy S. C. Chan  Michael T. Prosser  David A. Watkins 《Higher Education》2009,58(3):375-386

This article examines the construct validity of the Course Experience Questionnaire (CEQ) in Hong Kong and investigates the similarities and differences in the process of learning among students in different disciplinary studies. It is based on a survey of 1,563 undergraduate students in two disciplines, humanities and sciences, and of principally Chinese ethnicity. Findings from exploratory and confirmatory factor analyses support the scale structure of the four subscales of a modified version of the CEQ (good teaching, clear goals and standards, appropriate work, and appropriate assessment) in a non-Western context and could provide a basis for cross cultural research and international benchmarking. While there was variation across subgroups, there was a genuine pattern of relationships between the perceptions of learning environment and learning strategies shown by structural modeling. This information could be used to inform the design of discipline-specific programs in the new curriculum.  相似文献   

Pulling my gut out—Simple tools for engaging students in gross anatomy lectures     

Lap Ki Chan 《Anatomical sciences education》2010,3(3):148-150

A lecture is not necessarily a monologue, promoting only passive learning. If appropriate techniques are used, a lecture can stimulate active learning too. One such method is demonstration, which can engage learners' attention and increase the interaction between the lecturer and the learners. This article describes two simple and useful tools for demonstration during gross anatomy lectures. One is an apron for demonstrating midgut rotation and the other is a simple “human” model for demonstrating the relationship between the uterus and the peritoneum. Anat Sci Educ. © 2010 American Association of Anatomists.  相似文献