Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids     

Nam-Trung Nguyen  Yee-Cheong Lam  Soon-Seng Ho    Cassandra Lee-Ngo Low 《Biomicrofluidics》2008,2(3)

This paper reports the improvement of rectification effects in diffuser∕nozzle structures with viscoelastic fluids. Since rectification in a diffuser∕nozzle structure with Newtonian fluids is caused by inertial effects, micropumps based on this concept require a relatively high Reynolds numbers and high pumping frequencies. In applications with relatively low Reynolds numbers, anisotropic behavior can be achieved with viscoelastic effects. In our investigations, a solution of dilute polyethylene oxide was used as the viscoelastic fluid. A microfluidic device was fabricated in silicon using deep reactive ion etching. The microfluidic device consists of access ports for pressure measurement, and a series of ten diffuser∕nozzle structures. Measurements were carried out for diffuser∕nozzle structures with opening angles ranging from 15° to 60°. Flow visualization, pressure drop and diodicity of de-ionized water and the viscoelastic fluid were compared and discussed. The improvement of diodicity promises a simple pumping concept at low Reynolds numbers for lab-on-a-chip applications.  相似文献   

Children's Literature in Adult Education     

Laina Ho 《Children‘s Literature in Education》2000,31(4):259-271

This article investigates the possible role of children's literature in the education of adult learners of English. This three-year study on adult learners of English from the People's Republic of China shows that children's literature can be effective in teaching linguistic skills such as pronunciation practice and improving language acquisition. Using and reading children's literature is an initial step to developing literary competence, critical thinking, increasing knowledge, and multicultural understanding as well as exposing learners from developing countries to effective innovative educational methodology. Despite the limitations of children's literature—identification with child protagonists—it paves the way to developing literacy in adult literature.  相似文献   

Evaluation in the Design of Complex Systems     

Li‐An Ho  Thomas M. Schwen 《Performance Improvement Quarterly》2006,19(2):135-154

We identify literature that argues the process of creating knowledge‐based system is often imbalanced. In most knowledge‐based systems, development is often technology‐driven instead of requirement‐driven. Therefore, we argue designers must recognize that evaluation is a critical link in the application of requirement‐driven development models because it provides the information that keeps the iterative developmental process on track. In this study we took a closer look at the decision‐making in the design of a complex performance system in a non‐profit organization. The purpose was to gain insights into the roles and functions of evaluation during the process of building a performance support system. This study adopted an exploratory case study as its inquiry method. Findings suggested that effective communication is as important a function to evaluation as is decision‐making, and that the implementation of evaluation seldom follows the textbook guidelines. That is, evaluation practice is a patchwork history of the designers' knowledge and experience. Further, neither complexity nor the informality of the evaluation protocols seems to influence the quality of decision‐making.  相似文献   

How Can Released State Test Items Support Interim Assessment Purposes in an Educational Crisis?     

Emma M. Klugman  Andrew D. Ho 《Educational Measurement》2020,39(3):65-69

State testing programs regularly release previously administered test items to the public. We provide an open-source recipe for state, district, and school assessment coordinators to combine these items flexibly to produce scores linked to established state score scales. These would enable estimation of student score distributions and achievement levels. We discuss how educators can use resulting scores to estimate achievement distributions at the classroom and school level. We emphasize that any use of such tests should be tertiary, with no stakes for students, educators, and schools, particularly in the context of a crisis like the COVID-19 pandemic. These tests and their results should also be lower in priority than assessments of physical, mental, and social–emotional health, and lower in priority than classroom and district assessments that may already be in place. We encourage state testing programs to release all the ingredients for this recipe to support low-stakes, aggregate-level assessments. This is particularly urgent during a crisis where scores may be declining and gaps increasing at unknown rates.  相似文献   

An exploratory study on collaborative modes of professional development and learning for teachers of students with autism spectrum disorder (ASD)          下载免费PDF全文

Fuk Chuen Ho  Cici Sze‐Ching Lam  Sam Ka‐lam Sam  Michael Arthur‐Kelly 《Support for Learning》2018,33(2):142-164

This study aims to deliver a school‐based mode of training for in‐service teachers of students with ASD in Hong Kong. The training is delivered following the phases of implementation science, namely, exploration, installation, and implementation. The project team used the theory of mind approach, which enables teachers to engage with students with ASD and to focus on recognizing and reacting to emotions. Participants in this study included four educators from a teacher education institution, three expert teachers, and 19 in‐service teacher trainees. The most salient responses came from trainees who were provided with the opportunity to apply learned skills in their own classrooms immediately and to share the knowledge and skills in dealing with students with ASD in the post‐conference meetings.  相似文献   

The Contribution of Memory and Anxiety to the Math Performance of College Students with Learning Disabilities     

Frances Prevatt  Theresa L. Welles  Huijun Li  Briley Proctor 《Learning disabilities research & practice》2010,25(1):39-47

The impact of memory and anxiety on math performance was analyzed in a sample of 115 college undergraduates, all of whom had a diagnosed learning disability. The direct effects of memory and anxiety on math performance were first examined, followed by an examination of whether anxiety moderates the relationship between memory and math. Both memory and anxiety were found to directly affect math performance. Additionally, anxiety served as a moderator of the relationship between memory and math for most, but not all, measures of math achievement. The moderating effect of anxiety was stronger for long-term retrieval than for short-term memory. The relationships between memory, anxiety, and math were not significantly different for males and females. These findings suggest that, when working with individuals who have low anxiety but poor memory, enhancing memory strategies may be effective for remediating problems in math. However, for those with high levels of anxiety, it may be more efficacious to first ameliorate the anxiety, as working on memory may have a negligible effect on math performance for these individuals.  相似文献   

“When I Grow up I Would Like to Be …”: Factors Affecting Career Choice of Community Disability Workers in Southern Africa     

Sarah Rule  Callista Kahonde  Theresa Lorenzo 《International Journal of Disability, Development & Education》2015,62(5):486-500

The effectiveness of community based rehabilitation (CBR) programmes depends on the calibre of staff recruited and employed. Therefore, this study aimed to understand how the life experiences of community disability workers (CDWs) in Malawi, Botswana and South Africa influenced their choice of career. A life history approach was used to gather data from 16 CDWs, involving two interviews of each participant. Disability Studies postgraduate students conducted the interviews and analysed the data with academic staff, using thematic content analysis. It was found that lack of career guidance and information about community disability work affected participants’ initial choice of career. Some ended up in CBR because poor schooling prevented them from choosing other careers. Personal experience of disability and exposure to role models in rehabilitation motivated the career choice of some. The authors make recommendations including the selection of trainees with personal experience of disability and CDWs mentoring potential recruits.  相似文献   

Solving a conservation problem: The treatment of a batch of century-old Chinese manuscripts printed with fugitive red grid-lines     

Angela Waisum Liu  Martina Yeeman Ho  Chunying Lai 《文物保护研究》2014,59(5):S248-S249

  相似文献   

Understanding and treating psychopathology in schools: Introduction to the special issue     

Andrew S. Davis  Theresa Kruczek  David E. McIntosh 《Psychology in the schools》2006,43(4):413-417

Investigating psychopathology in school‐aged children is a topical discussion given the recent increased focus of the U.S. government and professional psychology on this issue. In the last 5 years, the Surgeon General of the United States (Satcher, 2000) and the President's New Freedom Commission on Mental Health (2003) both addressed the need for schools to actively participate in the treatment of children's mental health disorders. Further, psychologists were charged with transforming mental health care for children and families by promoting collaboration between schools, families, and communities; identifying empirically supported interventions; and enhancing culturally competent care for children and teens (P. Tolan & K. Dodge, 2005). To achieve these goals, mental health professionals in the schools need to be able to understand and effectively treat psychopathology in the school setting. School‐based treatment of psychopathology should be based on effective collaboration and grounded within the cultural context of the student population. A comprehensive understanding takes into account the biological basis of these disorders and factors influencing risk and resiliency. Treatment needs for these students often combine traditional therapies and psychopharmacology. Within a comprehensive system of care, specific disorders such as Reactive Attachment Disorder, Early Onset Bipolar Spectrum Disorder, Posttraumatic Stress Disorder, depression, and anxiety can and should be treated in schools. © 2006 Wiley Periodicals, Inc. Psychol Schs 43: 413–417, 2006.  相似文献   

Challenges to Values Education in Hong Kong School Music Education     

Wai-Chung Ho 《Asia Pacific Journal of Education》2006,26(2):225-241

This study deals with the issue of incorporating values education in music education in Hong Kong's primary and secondary schools. It includes the development of the state's cultural and national identity since its handover from the United Kingdom to the People's Republic of China (PRC). Thirty primary and secondary school music teachers were interviewed in order to understand how notions of “musical values” and “non-musical values” have been addressed in the curriculum. In particular, this study focuses on music teachers' perspectives on teaching world music, traditional Chinese music, the PRC national anthem, and non-musical values. This paper questions the effectiveness of existing curricular and pedagogical attempts to encourage the students' musical experience and extra-musical education. It concludes that values education must have clear conceptions of “values”, “musical cultures”, and “national identity” in order to maintain unity amidst the intensifying plurality of ethnicities and cultures in Hong Kong.  相似文献