Segmental sequencing of kinetic energy in a computer-simulated golf swing

The concept of the transfer of kinetic energy (KE) sequentially through the human body from proximal to distal segments is an influential concept in biomechanics literature. The present study develops this area of research through investigation of segmental sequencing of the transfer of KE by means of computer simulation. Using a musculoskeletal computer model previously developed by the authors, driven using three-dimensional kinematic data from a single elite male golfer, combined inverse and forward dynamics analyses enabled derivation of KE. Rigid body segments of torso, hips, arms and clubhead were examined in line with previous literature. Using this method a driver swing was compared to a 7 iron swing. Findings showed a high level of correlation between driver and iron peak KE and timing of peak KE relative to impact. This seems to indicate equivalent trunk and arms linear velocity, thus force applied, for an iron shot and a driver shot. There were highly significant differences between KE output for body segments for both clubs. In addition, peak KE magnitudes increased sequentially from proximal to distal segments during swing simulations for both the driver and 7 iron. This supports the principle of the summation of speed. However, timing of peak KE was not sequential from proximal to distal segments, nor did segments peak simultaneously. Rather, arms peaked first, followed by hips, torso and club. This seems to indicate a subjective optimal coordination of sequencing.

The improvement in walking speed induced by resistance training is associated with increased muscular strength but not skeletal muscle mass in older women

Objective: The purpose of the present study was to analyze whether improvements in fast walking speed induced by resistance training (RT) are associated with changes in body composition, muscle quality, and muscular strength in older women. Methods: Twenty-three healthy older women (69.6?±?6.4 years, 64.95?±?12.9?kg, 1.55?±?0.07?m, 27.06?±?4.6?kg/m²) performed a RT program for 8 weeks consisting of 8 exercises for the whole body, 3 sets of 10–15 repetitions maximum, 3 times a week. Anthropometric, body composition (fat-free mass [FFM], skeletal muscle mass [SMM], legs lean soft tissue [LLST], fat mass), knee extension muscular strength (KE1RM), muscle quality index (MQI [KE1RM/LLST]), and 10-meter walking test (10-MWT) were performed before and after the intervention. Results: Significant (P?<?.05) changes were observed from pre- to post-training for FFM (+1.6%), MQI (+7.2%), SMM (+2.4%), LLST (+1.8%), KE1RM (+8.6%), fat mass (?1.4%), and time to perform 10-MWT (?3.7%). The percentage change in 10-MWT was significantly associated with percentage change in MQI (r?=??0.46, P?=?.04) and KE1RM (r?=??0.45, P?=?.04), however not associated percentage of changes in SMM (r?=?0.01, P?=?.97), LLST (r?=??0.22, P?=?.33), and body fat (r?=?0.10, P?=?.66). Conclusion: We conclude that the improvement in the 10-MWT after an 8-week RT program is associated with increases in lower limb muscular strength and muscle quality, but not with muscle mass or body fat changes in older women.     

Mothers' Cognitive References to 2‐Year‐Olds Predict Theory of Mind at Ages 6 and 10

Mothers' mental‐state references predict individual differences in preschoolers' false‐belief (FB) understanding; less is known about the origins of corresponding variation in school‐age children. To address this gap, 105 children completed observations with their mothers at child ages 2 and 6, three FB tasks and a verbal comprehension test at age 3, and five FB tasks at age 6. Seventy‐seven of these children completed five Strange Stories at age 10. Individual differences in mothers' cognitive references at child age 2 predicted variation in children's FB understanding at age 6 and Strange Stories scores at age 10 (controlling for number of mothers' turns and children's mental‐state references, verbal comprehension and FB understanding at age 3, and mothers' cognitive references at child age 6).     

KNOWLEDGE THAT DOESN'T JUST SIT THERE: CONSIDERING A RECONCEPTION OF THE CURRICULUM INTEGRATION OF JEWISH AND GENERAL STUDIES

Since the onset of modernity, Jewish all-day schools have widely aspired to the curriculum integration of Jewish and general studies. This article surveys some of the most significant reasons why this ideal has largely remained unrealized. It argues that schools committed to an integrative ideal might benefit from reconceiving of integration in a manner which involves grounding it within constructivist/cognitivist assumptions about teaching and learning. A working model is offered for what the integration of Jewish and general studies might look like when conceived in this way. The article draws evidence from the curriculum of a recently established Jewish day school in Britain, suggesting that the instances displayed by this case, while constituting a weak form of integration, strongly embody a fertile notion of how students might be initiated into making sense of their world in an integrated fashion.     

Spatial characterisation of natural and third-generation artificial turf football pitches

In contrast to the situation with early artificial turf pitches, little information has previously been published on the characterisation of third-generation artificial surfaces. The spatial variation of ball rebound resilience and rotational resistance were measured here under dry conditions, late in the season, for two natural turf football pitches and a recently laid third-generation artificial turf pitch. Data for the natural turf pitches show a wider variation with position on the pitch than for the artificial pitch. The latter surface showed remarkable consistency in both quantities measured. Surprisingly, all ball rebound resilience data and some of the rotational resistance values were found to lie outside current FIFA specifications, possibly due to the level of wear in natural turf at this stage of the season. For the artificial turf, the deterioration in properties over a period of 6 months is significant and suggests more frequent testing is needed. Taking data from various pitch positions, the two measured quantities were shown for the first time, as far as we are aware, to be inversely related for both natural turf pitches. This correlation may be largely attributed to differences in the extent of grass cover and/or soil compaction. For artificial turf, the lack of variation in measured quantities with pitch position precluded the determination of any correlation.     

Efficiency of neutron tomography in visualizing the internal structure of metal artefacts from Mapungubwe museum collection with the aim of conservation

AimEstimating physical stability as well as revealing signs of fabrication in metal artefacts via two complementary nondestructive methods, neutron- and X-ray tomography were the main goals of this study.AbstractTo aid conservation management of metal artefacts improved knowledge of the internal structure and degree of corrosion therein is highly desired. In this study, neutron- and X-ray tomography were chosen as two complementary noninvasive visualization techniques to study internal structure and corrosion of five representative examples of archaeological metal artefacts from the Mapungubwe museum collection. Tomography was performed at the Neutron Radiography (SANRAD) facility of the South African Nuclear Energy Corporation where thermal neutrons as well as complementary X-rays are conveniently available under one roof. Comparative studies revealed neutron tomography to be generally superior to X-ray tomography due to the enhanced penetration properties of neutrons through the metal objects. In this paper the rich capability of neutron tomography as a nondestructive visualization aid for scientific conservation purposes is introduced and supported by results achieved for the five selected real artefacts.     

The idea of impact and its implications for academic development work

In the current context of higher education, those working in academic development feel the need to demonstrate the impact that their work makes on achieving desired institutional outcomes. In this paper, we examine the concept of impact, consider the various meanings of impact and review ways that the term has been used rhetorically and conceptually in relation to academic development. We explore our experience of working in an academic development unit (ADU) and what role impact may have played in our motivations and outcomes. Specifically, we document the changes in the focus, format and language of the ADU's annual reports over three years and reflect on what these revealed to us about our approach to academic development work and the idea of impact.

Dans le contexte actuel de l'enseignement supérieur, ceux qui oeuvrent dans le domaine du développement pédagogique ressentent le besoin de démontrer l'impact de leur travail en relation avec les résultats institutionnels escomptés. Dans cet article, nous examinons la notion d'impact, nous étudions ses diverses significations et nous passons en revue les façons avec lesquelles cette notion a été utilisée aux plans rhétorique et conceptuel en lien avec le développement pédagogique. Nous explorons notre expérience de travail au sein d'une unité de développement pédagogique (ADU) et quel rôle l'impact a pu jouer à l'égard de nos motivations et de nos résultats. De façon plus spécifique, nous documentons les changements de focus, de format ou de langage observés dans les rapports annuels de notre ADU sur une période de trois ans et réfléchissons à ce que cela nous a révélé au sujet de notre approche à l'égard du travail de développement pédagogique et de la notion d'impact.     

Increasing student participation in the learning process

This paper is about increasing student participation in the teaching and learning process. It describes a methodology designed and implemented by the author for an Industrial Analysis unit in 1990–91 and emphasises the underlying educational philosophy. Industrial Analysis is a second year subject within the course Industrial and Business Systems, Department of Mechanical and Production Engineering in De Montfort University (former Leicester Polytechnic).The test of educational quality is assumed to be — What students are able to do on their own after exams. The programme aimed to train second year engineering undergraduates for industrial placement in the third year and, more generally, to bridge the gap between Institutes of Technology and industries.The subject — Industrial Analysis — is compared to the rest of the course — Industrial and Business Systems. The purpose is to assess how second year students perceive learning. With such knowledge a teaching approach could be devised to improve learning outcomes.The student-centred teaching approach is based on three pillars: explanation of theory, instruction on research methods, industrial applications. A total of 111 students form 25 teams and research 18 industries. The focus is on Research capability and Group interaction.Helpful guidelines emerge from student performance — how to avoid common pitfalls in research, such as unclear objectives, wide scope, vague approach, excessive data, superfluous technicalities and digressions. Advantages of early focusing are illustrated. Factor analysis is applied in order to find out how concepts are integrated by students.Sharing of experiences and team-working routines in class is used to bring down psychological barriers to learning. Individual and team levels of learning are examined through successive exposures and cycles.     

A computer-based vocabulary program for three categories of student

Two experiments were designed to test the effectiveness of a computer-based vocabulary program. In Experiment One, high school students classified as learning disabled and remedial were given a 60-item pre-test made up of terms normally taught by their teacher. After selecting the 35 most difficult terms, 28 of them were assigned to a computer program involving a pre-test, practice, post-test sequence, and using cumulative review, mouse-controlled responding, and configuring responses to focus student attention. Seven terms were designated as control items by placing them in post-tests but not in the computer program. Students were given three computer sessions on consecutive school days, with a written multiple-choice post-test following each session. Results indicated a significant gain on computer items after the second computer session for the youngsters with learning disabilities, and after the first session for remedial pupils. Performance on control items did not improve across measures for either group.
In Experiment Two, a pre-test/post-test control group design was arranged to investigate the effects of the same computer program used to teach health terms to general education high school students. The results were similar to those of the first experiment.