The Systemist Emergentist View of Mahner and Bunge on ‘Species as Individuals’: What Use for Science and Education?

The Bungian philosophical system, with its constant focus on the demarcation between concepts and coherent material systems, is particularly helpful for introducing scientists and students to the ontology of biological systems. We illustrate this with the case of the debate about species as individuals, largely a concern for philosophers of biology rather than biologists themselves, but potentially confusing for the latter when engaging in philosophical reflection about their conceptions and practice. Bunge attains his goal of writing efficiently for readers outside the philosophical academic microcosm, and the Bungian system is worth more promotion for a large audience, particularly for introducing notions of modern systemist emergentist philosophy in biological scientific training.     

An examination of slo-pitch pitching trajectories

Many slo-pitch coaches and players believe that generating spin on a ball can affect its trajectory. The influence of air resistance on a ball that is thrown at a moderate speed and spin is unclear. The aim of this study was to examine the influence of spin on the ball's trajectory in slo-pitch pitching using both experimental results and ball flight simulations. Fourteen pitchers participated in the study, each of whom threw five backspin and topspin pitches each. Data were collected using standard three-dimensional videography. The horizontal velocity, vertical velocity, angular velocity, release height, and horizontal displacement of the backspin pitches were significantly higher than those of the topspin pitches. The ball flight simulations were developed to examine the influence of the ball spin, and it was concluded that the spin of the ball had a significant effect on the ball's vertical and horizontal displacements. Furthermore, our results suggest that a backspin pitch that reaches the maximum height allowable and lands in the front edge of the strike zone has the steepest slope. The present results add to our understanding of projectile motion and aerodynamics.     

Biomechanical analysis of circles on pommel horse

The aim of this study was to analyse the principal mechanics of circles. Seventeen university male gymnasts performed circles on an instrumented pommel horse model that enabled the pommel reaction forces to be recorded at 1000 Hz with two force plates. The circles were also videotaped using two digital video cameras operating at 60 frames per second. During circles, the vertical component of the reaction forces peaked in the double-hand support phases. Changes in the velocity of the centre of mass corresponded to the change in the tangential components of horizontal reaction forces. The velocity of the centre of mass had its peaks in the single-hand support phases and its local minimums in the double-hand support phases. The velocity of the ankles and that of the centre of mass of the head and trunk were minimal in the single-hand support phases and were maximal in the double-hand support phases. These results suggest that the circles were composed of vertical movements and two kinds of rotations: rotation of the centre of mass and rotation of the body itself about the centre of mass. These two kinds of rotations, which influence the legs' rotational velocity, are phase dependent. To further our understanding of circles, research on circles in different orientations on the pommel horse will be beneficial.     

Impact of Overt and Subclinical Hypothyroidism on Exercise Tolerance: A Systematic Review

Purpose: This systematic review describes the state of the art of the impact of hypothyroidism on exercise tolerance and physical performance capacity in untreated and treated patients with hypothyroidism. Method: A systematic computer-aided search was conducted using biomedical databases. Relevant studies in English, German, and Dutch, published from the earliest date of each database up to December 2012, were identified. Results: Out of 116 studies, a total of 38 studies with 1,379 patients fulfilled the inclusion criteria. These studies emphasize the multifactorial causes of exercise intolerance in untreated patients by the impact of limitations in different functional systems, with cardiovascular, cardiopulmonary, musculoskeletal, neuromuscular, and cellular metabolic systems acting in concert. Moreover, the studies affirm that exercise intolerance in patients is not always reversible during adequate hormone replacement therapy. As a consequence, despite a defined euthyroid status, there remains a significant group of treated patients with persistent complaints related to exercise intolerance who are suffering from limitations in daily and sport activities, as well as an impaired quality of life. An explanation for this phenomenon is lacking. Only 2 studies investigated the effects of a physical training program, and they showed inconsistent effects on the performance capacity in untreated patients with subclinical hypothyroidism. Conclusions: A limited body of knowledge exists concerning exercise tolerance in treated patients with hypothyroidism, and there is an insufficient amount of quantitative studies on the effects of a physical training program. To enhance exercise and sports participation for this specific group, more research in this forgotten area is warranted.     

How to improve reading comprehension in high-risk students: effects of class practices in Grade 5

This study investigated the effect of class practices on students’ learning gains in reading comprehension in the 5th grade. A sample of 4,344 students in 283 classes in 176 schools was studied. Several class practices that have previously been demonstrated to be effective were tested while controlling for student characteristics and socioeconomic and ethnic class composition. Differential effects were tested to identify class practices that can contribute to narrowing the achievement gap between high- and low-risk students. Most class practices turned out to have a similar effect for both low- and high-risk students. However, “discovery learning” and “well-organised and attractive instruction” appeared to be more beneficial for low-risk than for high-risk students. Group composition in terms of social and ethnic background turned out to have no significant effect on learning gains in reading comprehension.     

Design‐based Research: Case of a teaching sequence on mechanics

Design‐based research, and particularly its theoretical status, is a subject of debate in the science education community. In the first part of this paper, a theoretical framework drawn up to develop design‐based research will be presented. This framework is mainly based on epistemological analysis of physics modelling, learning and teaching hypotheses. It includes grand theories, a specific theory that following Cobb, Confrey, diSessa, Lehrer, and Schauble is a “humble theory” in the sense that it does “real work”, and tools for design. In the second part, we will show how this specific theory and its tools led designers to develop teaching resources in the case of a teaching sequence on mechanics (Grade 10). We will explain how the components of the specific theory and tools guide the design at different levels; the conceptual structure of the teaching sequence, the chronology of the activities, the various choices of the type of activity and their wording. This presentation makes the bases of designing teaching resources explicit and therefore allows for scientific debate.     

The posts continue: becoming

This paper describes assumptions of representational logic and phenomenology that organize much of Enlightenment humanism and one of its knowledge projects, conventional humanist qualitative methodology. The author argues that the ontological critiques of “post” theorists, including Foucault, Derrida, Baudrillard, Lyotard, and Deleuze and Guattari, were set aside in favor of epistemological projects following World War II and that, in general, the “posts” had little effect on that methodology. Those critiques are now being put to work and extended in the new empiricism and new materialism to re-imagine being, always an ethical task. Whether humanist qualitative inquiry can survive the ontological turn is a question to consider.     

A multidimensional model of school dropout from an 8-year longitudinal study in a general high school population

This study tests an empirical multidimensional model of school dropout, using data collected in the first year of an 8-year longitudinal study, with first year high school students aged 12–13 years. Structural equation modeling analyses show that five personal, family, and school latent factors together contribute to school dropout identified at 19 years of age: poor parent–teenager relationships, youth depression and family difficulties, negative classroom climate, negative school interactions, and poor academic achievement. This model increases our understanding of the dropout process in the general population and has direct implications for the development of high school dropout prevention programs.     

Agricultural Extension Services and Market Regulation: Learning from a Comparison of Six EU Countries

Abstract

If farmers are to meet the new challenges facing agriculture (environment, rural development, etc.), appropriate knowledge has to be produced. But observations in six EU countries (France, Germany, Greece, the Netherlands, Spain and the UK) show that unexpected problems arise when technical support for agriculture is linked to market regulation, as recommended since the late 1980s. The source of these problems can be understood better by applying concepts from the service economy: i) The production of new knowledge requires strong interaction between service providers (technical support bodies) and beneficiaries (farmers). The weakening of non-market regulation procedures, which partly guaranteed these possibilities of interaction, makes the conception of an advisory service difficult. ii) As soon as consultancy becomes a paying service, some beneficiaries reduce technical interaction with their colleagues in order to benefit from a productive advantage, and the ‘multipliable’ nature of new knowledge is reduced. iii) An increasing number of farmers are excluded from the benefits of technical support even though they help to provide services that society expects from agriculture (management of the land, maintenance of activities in low-density areas). iv) The responsibility for combining contradictory requirements (competitiveness, environment, rural development) is most often put on the shoulders of individual farmers who are unequipped to deal with such complex issues. Observed trends attest to the fact that effects often run counter to the stated agricultural and rural development objectives of policies.