Latinas’ heritage language as a source of resiliency: impact on academic achievement in STEM fields

Cultural Studies of Science Education - This article highlights how the preservation of heritage languages is essential in the construction of three Georgia Latina participants’ cultural...     

Overcoming a Learning Bottleneck: Inquiry Professional Development for Secondary Science Teachers

This paper examines the summer component of a year-long professional development program. The program was developed based on recent models of effective professional development that indicate that teachers should guide the direction and focus of the professional development program. Specific activities in the summer program were adapted from a long-running, successful program for university faculty development. In this study we explore the conceptions of inquiry teachers developed during the program, as well as the products teachers created. The discrepancies between program goals and the teachers’ products and conceptions are described and reasons for these differences explored. The results suggest that engaging teachers in identifying key issues in their own professional development is an effective strategy.     

The Effectiveness of Teaching Geometry to Enhance Mathematical Understanding in Children with Down Syndrome

ABSTRACT

It is widely known that people with Down syndrome have difficulties transitioning from a basic understanding of counting and cardinality to more advanced arithmetic skills. This is commonly addressed by resorting to the mechanical use of algorithms, which hinders the acquisition of mathematical concepts. For this reason some authors have recently proposed a shift in the focus of learning from arithmetic to more fertile fields, in terms of understanding. In this paper we claim geometry fits this profile, especially suited for initiating children with Down syndrome into mathematics. To support this we resort to historical, epistemological, and cognitive reasons: the work of Séguin and his intuition on the central role of geometry in the development of abstract thinking in the so-called idiot children, the ideas of René Thom about the role of continuum intuition in the emergence of conscious thinking, and finally the two strengths people with Down syndrome display: visual learning abilities and interest in abstract symbols. To support these ideas we present the main findings of qualitative research on elementary mathematics teaching to a group of seven children (3–8) with Down syndrome in Spain. The didactic method used, naturally enhance their naïve geometrical conceptions.     

The Construction of Customized Two-Stage Tests

In this paper mixed integer linear programming models for customizing two-stage tests are given. Model constraints are imposed with respect to test composition, administration time, inter-item dependencies, and other practical considerations. It is not difficult to modify the models to make them useful in constructing multistage tests.     

Memorisation methods in science education: tactics to improve the teaching and learning practice

How can science teachers support students in developing an appropriate declarative knowledge base for solving problems? This article focuses on the question whether the development of students’ memory of scientific propositions is better served by writing propositions down on paper or by making drawings of propositions either by silent or muttering rehearsal. By means of a memorisation experiment with eighth- and ninth-grade students, we answer this question. In this experiment, students received instruction to memorise nine science propositions and to reproduce them afterwards. To support memorisation students were randomly assigned either to a group that received instruction to write each proposition on paper or to a group that received instruction to make a drawing about the content of the proposition. In addition, half of the students in both groups received instruction to mutter and the other half of them received instruction to write or draw in silence. The main conclusion from the experiment is that after four weeks students who had made a drawing remembered significantly more propositions than those who had memorised the propositions by writing them down. Our research further revealed that it did not matter whether students muttered or memorised silently.     

Tradutore,traditore: Can the aect code of ethics “speak” across cultures?

Conclusion Although many questions remain unanswered, these early translations of the AECT Code of Ethics will be available at the AECT Web site to ensure that access to the principles is offered in languages other than English. As they become available, more translations will be added to the English, Farsi, French, Mandarin Chinese, Portuguese, and Spanish versions. The translations will be saved as PDF files to retain the unique characters of each language. Additional translators with expertise in both educational technology and the targeted languages will be identified. Exploration of ways to encourage debate regarding the viability of the translations within diverse cultures continues. The ultimate hope is that collaboration among members of the professional ethics committee of AECT, the translators, and interested educators will result in the development of a Code of Ethics that “speaks” across cultures and establishes a meaningful guide to professional conduct around the world. Authors’ Note: This article expands on earlier work published in the (2002) Proceedings of the Annual Meeting of the Association for Educational Communications and Technology, edited by M, Simonson.     

Levels of phonological representation in skilled reading and in learning to read

This paper refers to and discusses empiricalevidence supporting the general idea that bothskilled reading and learning to read capitalizeon underlying phonological representations.These representations must be specified interms of degree of abstractness, unitsrepresented and degree of conscious access tothese units. In skilled reading, pre-lexicalrepresentations, at different levels ofphonological structure, are unconsciously,mandatorily and automatically activated, inconnection with correspondent orthographicrepresentations. This process is distinct fromthe intentional and controlled phonologicaldecoding assumed by the classic dual-routemodel. Learning to read may be described as theprogression from conscious phonologicaldecoding, in which phoneme awareness plays acritical role, to the unconscious mapping oforthographic and phonological segments.Phonological dyslexia is related to someanomaly in speech perception capacities, makingit difficult both to develop efficientconscious segmentation abilities andgrapho-phonological decoding. It is suggestedthat this conscious speech segmentation deficitis caused by a lack of appropriate segmentationat the unconscious, perceptual level.     

The ingestion of a caffeinated energy drink improves jump performance and activity patterns in elite badminton players

The aim of this study was to investigate the effectiveness of a caffeine-containing energy drink to enhance physical and match performance in elite badminton players. Sixteen male and elite badminton players (25.4 ± 7.3 year; 71.8 ± 7.9 kg) participated in a double-blind, placebo-controlled and randomised experiment. On two different sessions, badminton players ingested 3 mg of caffeine per kg of body mass in the form of an energy drink or the same drink without caffeine (placebo). After 60 min, participants performed the following tests: handgrip maximal force production, smash jump without and with shuttlecock, squat jump, countermovement jump and the agility T-test. Later, a 45-min simulated badminton match was played. Players’ number of impacts and heart rate was measured during the match. The ingestion of the caffeinated energy drink increased squat jump height (34.5 ± 4.7 vs. 36.4 ± 4.3 cm; P < 0.05), squat jump peak power (P < 0.05), countermovement jump height (37.7 ± 4.5 vs. 39.5 ± 5.1 cm; P < 0.05) and countermovement jump peak power (P < 0.05). In addition, an increased number of total impacts was found during the badminton match (7395 ± 1594 vs. 7707 ± 2033 impacts; P < 0.05). In conclusion, the results show that the use of caffeine-containing energy drink may be an effective nutritional aid to increase jump performance and activity patterns during game in elite badminton players.     

Analysis of the distance covered by Brazilian professional futsal players during official matches

The purpose of this study was to measure and characterise the distances covered by Brazilian professional futsal players. The trajectories of 93 players during five matches were obtained using an automatic tracking method. The distances covered were analysed for different game conditions: over the entire game and during the times when the ball was out of play and in play separately. When the entire game was considered, the results showed that there was a reduction in the total distance covered per minute from the first [median ± IQR (interquartile range): 97.9 ± 16.2 m/min] to the second half (median = 90.3 m/min; IQR = 12.0), and when only the in-play time was considered (first half: 136.6 ± 17.2 m/min; second half: 129.2 ± 16.7 m/min). The percentage of distance covered in the standing and walking velocity range was higher in the second half than in the first when considering the entire game (30.8% and 28.0%, respectively) and during the in-play time (19.3% and 16.2%, respectively). In conclusion, this study verified that futsal players reduced the physical performance during the second half.     

Prevalence of vulnerability and protective factors of sexual victimization

English language abstract not available at time of publication.