Initial conditioned solutions of a second-order nonlinear conservative differential equation with a periodically varying coefficient     

Lucas Pun 《Journal of The Franklin Institute》1973,295(3):193-216

The exact solution of the equation where d, d' and w are positive constants, and ?(wt) is a rectangular periodic function of time is discussed. The equation describes approximately the transversal movement of a particle in an alternating gradient accelerator. The exact solution is obtained in the form of a composite recurrent relation containing five particular solutions. Each of these solutions corresponds to a specific well-defined area of the phase plane of the initial conditions. The dynamical behaviour and the stability of the movement are examined analytically.  相似文献   

Guided portfolio writing as a scaffold for reflective learning in in-service contexts: a case study1     

Íris Susana Pires Pereira  Maria Cristina Cristo Parente  Cristina Vieira da Silva 《Teacher Development》2016,20(5):614-630

Language is widely recognized as an inescapable mediating tool for professional learning, and with this text we want to contribute to a better understanding of the particular role that guided writing can play in in-service professional reflective learning. We analysed one pre-school teacher’s written portfolio, the construction of which was guided to scaffold deep thinking about (and the transference of theory into) practice during participation in an in-service program about language education. Our case study shows that the writing process sustained robust learning about professional knowing, doing and learning itself: The teacher elaborated an integrative ethical understanding of the discussed theory, fully experienced newly informed practices and assessed her own learning by using theory to confront her previous knowledge and practices. Throughout the portfolio, the learning stance revealed by her voice varied accordingly. The study illustrates the potential of guided writing to scaffold reflective learning in in-service contexts.  相似文献   

Using Portfolios for External Assessment: An Experiment in Portugal     

Maria Teresa Torres Pereira de Ea 《The International Journal of Art & Design Education》2005,24(2):209-218

This article describes some of the conclusions reached from an experiment using portfolios for art external assessment at the end of secondary education (age 17+) conducted in five Portuguese schools in 2001–2003. Several positive outcomes were found. Students found portfolios to be motivating and fostering constructive learning, dialogue and co‐operation between students and teachers. The new assessment procedures developed communities of assessors enabling some increased consistency of examination results and positive professional development opportunities. However some weaknesses were detected such as potential bias related to the degree of teacher aid and practical problems as, for example, time‐consuming in‐service teacher training.  相似文献   

Enriching students’ language skills and confidence through a university mentoring scheme     

Lucas Kohnke  Andrew Jarvis 《师资教育杂志》2019,45(2):223-224

University can be a challenging learning environment for students entering with a lower level of English. This report focusses on a mentoring scheme which aims to enhance undergraduate students’ English language skills so that they gain the most from their studies. Around 200 students participate in this mentoring scheme each academic year and the programme involves around ten university English teachers who act as mentors. In this report, we describe the programme and reflect on our experience as mentors.  相似文献   

Citizen science in digital worlds: the seduction of a temporary escape or a lifelong pursuit?     

Deborah J. Tippins  Lucas John Jensen 《Cultural Studies of Science Education》2012,7(4):851-856

There is a vast terrain of emerging research that explores recent innovations in digital games, particularly as they relate to questions of teaching and learning science. One such game, Citizen Science, was developed to teach players about the practice of citizen science as well as lake ecology. Citizen science is a pedagogy that has a long history within the scientific community, engaging the public in ongoing community and environmental surveys to collect data for existing small-scale studies. More recently, citizen science has gained traction as an educational context for teaching and learning science in ways that connect to students?? lives and interests. By placing citizen science within the realm of digital worlds, Matthew Gaydos and Kurt Squire invite new possibilities for knowledge to become more kinetic, moving in multiple directions. In this article we discuss some of the tensions we experienced as we explored the digital game, Citizen Science. We highlight questions about narrative and complexity, emergent game play and transfer to encourage thinking about the development and implementation of games such as Citizen Science.  相似文献   

Mathematics learning and assessment using MathE platform: A case study     

Azevedo  Beatriz Flamia  Pereira  Ana I.  Fernandes  Florbela P.  Pacheco  M. Fatima 《Education and Information Technologies》2022,27(2):1747-1769

Education and Information Technologies - Universities are encouraging the implementation of innovative methodologies and teaching strategies to develop an interactive and appealing educational...  相似文献   

EFFECTIVENESS OF THE FRIENDS FOR LIFE PROGRAM IN PORTUGUESE SCHOOLS: STUDY WITH A SAMPLE OF HIGHLY ANXIOUS CHILDREN     

Ana Isabel Pereira  Teresa Marques  Vanessa Russo  Luísa Barros  P. Barrett 《Psychology in the schools》2014,51(6):647-657

The FRIENDS for Life program is a cognitive–behavioral group program that targets anxiety in children. The main purpose of this study was to analyze the effectiveness of the Portuguese version of the FRIENDS for Life Program, which was implemented in schools to reduce anxiety problems in a group of highly anxious children. The study used a quasi‐experimental research design with two groups of children, an intervention (n = 17) and a wait‐list control group (n = 21), aged 8 to 12 years old. The impact of the program in reducing anxiety symptoms as assessed by children and mothers was analyzed through the Screen for Child Anxiety Related Emotional Disorders‐Revised (SCARED‐R). The results show a statistically significant post intervention effect on anxiety symptoms evaluated by the child, but not by the mother. The implications of these results for the prevention of anxiety disorders in Portuguese schools are discussed.  相似文献   

The lack of representation of educational psychology and school psychology in introductory psychology textbooks     

Jennifer L. Lucas  Melissa A. Blazek  Amber B. Raley  Christi Washington 《教育心理学》2005,25(4):347-351

The first goal of this study was to look at the representation of educational and school psychology in introductory psychology textbooks. Research into the representation of other sub‐fields of psychology has been conducted but no research has looked specifically at educational or school psychology. The second goal was to compare the representation of educational and school psychology in introductory psychology textbooks to see if one or the other is receiving more coverage. Third, the textbooks with the most coverage were listed in order to aid educational and school psychologists teaching introductory psychology courses in selecting textbooks that adequately cover material from their sub‐fields. A total of 57 introductory psychology textbooks were content analyzed: 65% of the introductory psychology textbooks had educational psychology material and 65% had school psychology material. However, in the textbooks containing this material the educational and school psychology material made up only .29% and .19% of the textbooks’ total content.  相似文献   

Differentiation as measured by the Classroom Practices Survey: a validity study updating the original instrument     

Pereira  Nielsen  Tay  Juliana  Maeda  Yukiko  Gentry  Marcia 《Learning Environments Research》2019,22(3):443-460

The Classroom Practices Survey assesses educators’ use of differentiated instruction with students achieving at average and high levels. The purposes of this study were to investigate if the Classroom Practices Survey (1) yields reliable and valid data from the groups for which it was originally designed and (2) can be used to evaluate teachers’ differentiation practices for students who achieve at low levels. Participants included 648 elementary teachers who completed the Classroom Practices Survey for students achieving at high, average and low levels. Confirmatory factor analyses revealed that the original six-factor model was not supported by the current data. Model fit was improved with a four-factor model, but did not reach the recommended values for good model fit. Further research and possibly modifications are needed before this tool is used by researchers and schools. This study highlights the importance of periodically evaluating instruments and revising them if necessary.

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Assessing emergent literacy in preschool classrooms     

C. Melanie Schuele  Joanne Erwick Roberts  Jill Fitzgerald  Patti Lucas Moore 《Early Childhood Education Journal》1993,21(2):13-21

Recent research on the literacy development of children during the preschool years has emphasized the notion of “emergent literacy,” according to authors Kontos (1986) and Teale and Sulzby (1986). According to this view, preschool children learn about reading and writing as they participate in a literate culture. Early social interactions involving print are crucial to children's reading and writing development, according to the Early Childhood and Literacy Development Committee (1986).  相似文献