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

The exact solution of the equation

$\text{d}{}^2\text{x}\text{dt}{}^2\text{+dx+d′f(wt)x}{}^3\text{=0,}$

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.     

Exploring ICT Integration as a Tool to Engage Young People at a Flexible Learning Centre

The Edmund Rice Education Australia (EREA) Flexible Learning Centres aim to provide a supportive learning environment for young people who find themselves outside of the mainstream secondary schooling system. Drawing on twenty first Century learning principles, the Centres aim to deliver a personalised learning experience with an emphasis on flexibility and individual choice. Provision of a comprehensive curriculum enables young people to make positive future life choices and successfully transition into employment and further training. The aim of this research project has been to work with teaching staff at a Flexible Learning Centre in North Queensland, Australia, to explore the value of integrating ICT in the form of Web 2.0 technologies to enhance young people??s engagement with the subject of science. The findings of this case study suggest that ICT integration is effective in revitalising science education interest for disengaged young people. This may have wider implications in relation to general concerns of declining student interest and participation in science in the secondary years of schooling.     

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

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.     

Assessing emergent literacy in preschool classrooms

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).     

Telecommunications (non-broadcasting)

Martin C.J. Elton, William A. Lucas, and David W. Conrath, eds. Evaluating New Telecommunications Services (New York: Plenum Press, 1978—$59.50)

Harold Issadore Sharlin, Lord Kelvin: The Dynamic Victorian (University Park: Pennsylvania State University Press, 1979 —$16.00)     

A comparison of time-motion and technical–tactical variables between age groups of female judo matches

Abstract

The aim of the study was to verify differences between age groups of female judo matches in time-motion and technical–tactical analysis. The sample was composed of pre-cadet (13–14 years, n = 148), cadet (15–16 years, n = 228), junior (17–19 years, n = 104) and senior (>20 years, n = 237) groups. The time-motion indicators consisted of total combat time, standing combat time, displacement without contact, gripping time, total time of techniques, groundwork combat time and pause time, per match and by each combat/pause cycle. Technical and tactical variables were also collected. The one-way analysis of variance and a post hoc test were conducted, P ≤ 0.05. Cadets, with a median of 7 (2, 12), had a number of combat/pause cycles different from junior, with 3 (1, 8.5). Regarding time-motion per match and per cycle, senior had longer total combat time, standing combat time and gripping time than other groups. Senior presented lower frequency of leg techniques than pre-cadet, cadet and junior. Time-motion and technical–tactical variables effects in female judo athletes emphasise the difference between seniors and other groups.     

Alien or Alike? How the Perceived Similarity Between the Typical Science Teacher and a Student’s Self-Image Correlates with Choosing Science at School

By applying the self-to-prototype matching theory to students?? academic choices, this study links the unpopularity of science in many industrialized countries with the perceived gap between typical persons representing science (e.g. physics teachers) on the one hand and students?? self-image on the other. A sample of N?=?308 Dutch and German students described both themselves and typical teachers representing different school subjects using 65 trait adjectives. The following hypotheses were tested: The typical hard sciences teacher and the typical languages teacher will be perceived as differing in their personal characteristics. The typical physics teachers will be perceived as being less similar to students' own self-image than teachers representing languages. Actual choices students make during secondary school should correlate with the perceived fit between students?? self-image and the prototype of teachers representing different school subjects, especially in the less frequent and less popular choices of a math or physics major/profile. The findings supported these hypotheses. The discussion stresses that students acquire not only knowledge about science but also about science culture (sensu Aikenhead) in their science classes and that students?? image of science teachers can influence their academic choices.