Perceived competence and self-worth during adolescence: a longitudinal behavioral genetic study

This investigation is the first longitudinal behavioral genetic study of self-concept during adolescence. It is a follow-up of a previous study examining genetic and environmental contributions to children's perceived self-competence and self-worth using a twin/sibling design. The study investigated adolescents' reports 3 years later and stability across two time points. Participants included 248 pairs of same-sex twins, full siblings, and stepsiblings between 10 and 18 years old. The results showed that six of the seven subscales were heritable at the second time point. None of the scales showed significant shared environmental effects. Longitudinal analyses revealed genetic contributions to stability for perceived scholastic competence, athletic competence, physical appearance, and general self-worth. Social competence, on the other hand, showed nonshared environmental mediation across time. These findings highlight the importance of genetically influenced characteristics and unique experiences as correlates of individual differences in self-concept during adolescence.     

Transmission characteristics of the submarine cable

Evidence has been assembled to show that any deformable body moving in a fluid or immersed in a moving fluid will assume a shape that is as nearly as is possible “stream-line.”Illustrations of this principle of “stream-line” assumption are taken from geology, meteorology, physics, and biology.The adjustment of organisms in accordance with this principle is very similar to the adjustment by organisms to directed light (heliotropism) and to gravity (geotropism). Accordingly a term is suggested for defining this adjustment, vis., rheotropism.     

Patient-based benefit-risk assessment of medicines: development,refinement, and validation of a content search strategy to retrieve relevant studies

Introduction:Poor indexing and inconsistent use of terms and keywords may prevent efficient retrieval of studies on the patient-based benefit-risk assessment (BRA) of medicines. We aimed to develop and validate an objectively derived content search strategy containing generic search terms that can be adapted for any search for evidence on patient-based BRA of medicines for any therapeutic area.Methods:We used a robust multistep process to develop and validate the content search strategy: (1) we developed a bank of search terms derived from screening studies on patient-based BRA of medicines in various therapeutic areas, (2) we refined the proposed content search strategy through an iterative process of testing sensitivity and precision of search terms, and (3) we validated the final search strategy in PubMed by firstly using multiple sclerosis as a case condition and secondly computing its relative performance versus a published systematic review on patient-based BRA of medicines in rheumatoid arthritis.Results:We conceptualized a final search strategy to retrieve studies on patient-based BRA containing generic search terms grouped into two domains, namely the patient and the BRA of medicines (sensitivity 84%, specificity 99.4%, precision 20.7%). The relative performance of the content search strategy was 85.7% compared with a search from a published systematic review of patient preferences in the treatment of rheumatoid arthritis. We also developed a more extended filter, with a relative performance of 93.3% when compared with a search from a published systematic review of patient preferences in lung cancer.     

Integrating formative evaluation into a learner-centred revision course

This article describes a learner-centred course which ran in summer 1988. It was ostensibly a revision exercise, using computer assisted learning (CAL), but an element of formative evaluation was deliberately built into the process, making it contribute to our systematic review and development of our teaching. Our aim was to take snapshots of learning at different stages, through a short but intensive revision class in mathematics for engineering and science undergraduates at a Scottish university
The CALM Project—Computer Aided Learning in Mathematics—has produced 2 5 software units to enhance the teaching of calculus to large groups of undergraduates. The CALM software was piloted by one group of students and a formative evaluation of the packages has been reported elsewhere (Beevers et al 1987, Beevers et al 1988a). This revision course enabled us to confirm many of the previous evaluation findings on the CALM software; we also discovered that a round-up session on problem-solving is an important and integral part of the learning process. The evaluation proved useful to us as teachers of mathematics, and has already influenced the future development of our CAL work.     

Examining listening previewing as a classwide strategy to promote reading comprehension and vocabulary

Classwide instructional strategies to improve not only reading fluency but also comprehension and vocabulary knowledge are essential for student reading success. The current study examined the immediate effects of two classwide listening previewing strategies on reading comprehension and vocabulary knowledge. Twenty‐one, fourth‐grade general education students were exposed to three experimental conditions including a silent reading control condition, a listening previewing condition, and a listening previewing with vocabulary previewing condition. For all conditions, students read grade‐level passages, answered 10 comprehension questions, and completed a vocabulary‐matching task. Results showed that both listening previewing conditions led to improvements in comprehension as compared to silent reading. Adding a vocabulary previewing component to listening previewing procedures resulted in the highest levels of comprehension and vocabulary. Applied implications and directions for future research are discussed. © 2010 Wiley Periodicals, Inc.     

Physical characteristics of experienced and junior open-wheel car drivers

Abstract

Despite the popularity of open-wheel car racing, scientific literature about the physical characteristics of competitive race car drivers is scarce. The purpose of this study was to compare selected fitness parameters of experienced and junior open-wheel race car drivers. The experienced drivers consisted of five Formula One, two GP2 and two Formula 3 drivers, and the nine junior drivers drove in the Formula Master, Koenig, BMW and Renault series. The following fitness parameters were tested: multiple reactions, multiple anticipation, postural stability, isometric upper body strength, isometric leg extension strength, isometric grip strength, cyclic foot speed and jump height. The group differences were calculated using the Mann-Whitney U-test. Because of the multiple testing strategy used, the statistical significance was Bonferroni corrected and set at P < 0.004. Significant differences between the experienced and junior drivers were found only for the jump height parameter (P = 0.002). The experienced drivers tended to perform better in leg strength (P = 0.009), cyclic foot speed (P = 0.024) and grip strength (P = 0.058). None of the other variables differed between the groups. The results suggested that the experienced drivers were significantly more powerful than the junior drivers: they tended to be quicker and stronger (18% to 25%) but without statistical significance. The experienced drivers demonstrated excellent strength and power compared with other high-performance athletes.