Questions of chemistry

The research reported here derives from the general field of learner-centred teaching and learning, with specific reference to undergraduate chemistry. It documents the use of student-generated questions as diagnostic of their willingness to engage in classroom interactions. It explores four ways of gathering students' written questions and their relative effectiveness. It examines students' capacity to design and present 'quality questions' during phases of their learning and the extent to which these questions are indicative of particular styles of interaction in the classroom, both with tutors and with other students. The results are drawn from data collected through written questions posted into a question box, the 'hits' recorded on a computer software system, and through one-to-one interviews with a sample of 32 students. The results provide an opportunity to discuss the quality of interactions within fairly formalized systems of teaching and learning of chemistry in a university setting and to suggest further research required in this field.     

Sprint mechanical properties in soccer players according to playing standard,position, age and sex

ABSTRACT

The purpose of this study was to quantify possible differences in sprint mechanical outputs in soccer according to soccer playing standard, position, age and sex. Sprint tests of 674 male and female players were analysed. Theoretical maximal velocity (v₀), horizontal force (F₀), horizontal power (P_max), force-velocity slope (S_FV), ratio of force (RF_max) and index of force application technique (D_RF) were calculated from anthropometric and spatiotemporal data using an inverse dynamic approach applied to the centre-of-mass movement. Players of higher standard exhibited superior F₀, v₀, P_max, RF_max and D_RF scores (small to large effects) than those of lower standard. Forwards displayed clearly superior values for most outputs, ahead of defenders, midfielders and goalkeepers, respectively. Male >28 y players achieved poorer v₀, P_max and RF_max than <20, 20–24 and 24–28 y players (small to moderate), while female <20 y players showed poorer values than 20–24 and >24 y players for the same measures (small). The sex differences in sprint mechanical properties ranged from small to very large. These results provide a holistic picture of the force-velocity-power profile continuum in sprinting soccer players and serve as useful background information for practitioners when diagnosing individual players and prescribing training programmes.     

E‐Textbooks and Students’ Learning Experiences

The contribution of the e‐textbooks can be enormous considering their additional supporting features, but adoption has not crystallized yet. This study examines the relevant experiences of college students in terms of how the use of e‐textbooks may enhance their learning. A survey study was conducted to measure the perceptions of each student on how helpful an e‐textbook is for facilitating learning (i.e., E‐book Helpfulness), how well it promotes his/her involvement in learning (i.e., Student Involvement), and how much improvement it makes on learning outcome (i.e., Learning Outcome). Results indicate that e‐textbooks are perceived as enhancers of student learning experiences in two complementing routes: (1) E‐textbook Helpfulness enhances students’ learning outcomes directly and (2) Student Involvement plays an important mediating role between E‐textbook Helpfulness and Learning Outcome if students use e‐textbooks in class. These findings suggest that the successful adoption of e‐textbooks requires schools to provide necessary resources (e.g., computer labs) and instructors to actively engage students in using e‐textbooks.     

Predictors of Hispanic School Teachers' Self-efficacy in the Pedagogical Uses of Technology

A study to predict teachers' self-efficacy in using technology for pedagogical purposes was conducted in a predominantly Hispanic school district in south Texas; 438 elementary teachers completed a 32-item survey aligned to the National Educational Technology Standards for Teachers. Findings suggested that the instrument is highly reliable in measuring Hispanic school teachers' self-efficacy when they are asked to rate their confidence in their ability to perform technology tasks for educational purposes. An exploratory factor analysis (orthogonal and nonorthogonal) allowed the derivation of composite measures. Three subscales regarding issues of pedagogy composed the dependent variable. Regression analyses (OLS and 2SLS) revealed that two derived composite measures and two contrast variables listed in the general information of the survey strongly predicted the response variable.     

Las ideas de los alumnos sobre la ciencia como teorías implícitas

Resumen

Durante los últimos años, los trabajos sobre el aprendizaje de las ciencias han estado dominados por dos enfoques contrapuestos: la teoría piagetiana de las operaciones formales y el enfoque de las ideas previas o concepciones alternativas. Frente a estos dos enfoques los autores proponen una alternativa intermedia basada en el concepto de «teorías implícitas». Estas teorías serían teorías personales que, como las teorías científicas, sirven para organizar y predecir el mundo circundante. No obstante, presentan también características muy diferentes de las teorías científicas tanto en lo referente a su contenido como a su organización. Estas diferentes características tienen, como se expone en el artículo, importantes consecuencias tanto para la investigación como para la práctica educativa.     

Ideas,interacción,ambiente educativo y desarrollo: informe preliminar

Resumen

Se presenta en este trabajo un informe preliminar de una investigación longitudinal en la que las ideas evolutivo-educativas son evaluadas a lo largo del tiempo y se ponen en relación con las interacciones que 70 parejas (maridos y esposas) desarrollan con sus hijos de alrededor de 22 meses en situaciones diversas; se analiza también la relación con la estructuración del entorno físico y social del hogar, así como con el desarrollo del niño. Se han encontrado relaciones positivas entre las diferentes clases de padres definidos por sus ideas y las variables dependientes examinadas (contenidos de las interacciones, estimulación del hogar, desarrollo del niño).     

Teaching skills to promote clinical reasoning in early basic science courses

Basic and superior reasoning skills are woven into the clinical reasoning process just as they are used to solve any problem. As clinical reasoning is the central competence of medical education, development of these reasoning skills should occur throughout the undergraduate medical curriculum. The authors describe here a method of teaching reasoning skills in a clinical context during a human anatomy course. Anat Sci Educ 3:267–271, 2010. © 2010 American Association of Anatomists.     

Aprendizaje,memoria y comprensión de textos expositivos. Dos estudios de intervención sobre el texto

Resumen

Este artículo se encuadra en el área de investigación de la psicología de la comprensión de textos. Se realiza una breve revisión de conceptos fundamentales en orden a una mejor comprensión de los dos estudios que a continuación se presentan. La manipulación experimental se centra sobre el texto. El principal cbjetivo de ambos estudios consiste en comprobar la eficacia diferencial de dos tipos de ayuda—esquema y objetivos—sobre los procesos de memoria, comprensión y recuperación de la información procedente de textos expositivos. Un segundo objetivo es la comprobación del efecto de algunas modificaciones experimentales en los textos utilizados. La pauta de resultados obtenidos es consistente con la idea de que la presentación de un esquema previo a la lectura del texto optimiza los procesos de almacenamiento y recuperación de la información. Mostrándose, sin embargo, los objetivos como una ayuda de efectos muy limitados y específicos, o incluso nulos.