Setting the normative boundaries: crucial epistemological benchmarks in comparative education

Historians of comparative education have ordinarily viewed the development of that field as having progressed in stages, from impressionistic traveller tales to systematic investigations, with each stage eclipsing the previous one in rigour and acceptability. In this essay, I show that this common ‘Darwinian’ view is simplistic and distorts the real development of comparative education. Rather than in stages, I contend that the field has developed within three epistemological streams: positivist, relativist, and historical functionalist. These streams, each shaped over many decades, continue to be alive and well and delineate the field’s normative boundaries. Indeed, comparativists differ markedly in defining the field, because their definitions arise out of whichever particular epistemological stream they embrace. What we need is a definition that encompasses all normative streams, and the one that I propose is: comparative education is the application of the intellectual tools of history and the social sciences to understanding international issues of education.     

Instructional and Distributed Self-leadership for School Improvement: Experiences of Schools in the Kavango Region

This article uses the lens of self-leadership to understand the leadership practice of school principals in the Kavango region of Namibia. Self-leadership emphasises the focus on leading the self to enhance one's leadership in the organisation. Self-leadership will always function with other leadership styles; hence, the article uses instructional and distributed leadership styles to understand the possibility of principals having an influence on the improvement of academic quality in schools. This article explores how six secondary school principals in the Kavango region have employed self-leadership styles to improve and sustain the performance of learners. The study adopted a qualitative method that examined the selfleadership of the six school principals in the Kavango region. The data were collected from the six principals and two teachers of each school by using semi-structured interviews. The findings showed that school principals unknowingly employ self-leadership in their schools and in the process use distributed leadership together with instructional leadership to collaborate and share their leadership with teachers.     

Parents' and Kindergarten Teachers' Beliefs About the Effects of Child Care

Parents' and kindergarten teachers' beliefs about the effects of child care on children's adjustment to school were investigated. Using a standardized behavioral rating scale, both groups were asked to rate two hypothetical children just entering kindergarten; one with full-day child care experience and one who had only experienced care in the home by a parent or relative. There was an interaction between the experience of the believer and their ratings of the two hypothetical children. Parents who had used child care for their own children rated the 'day care child' most positively. Parents who had kept their own children at home rated the 'home care child' most positively. Kindergarten teachers rated both hypothetical children equally, but more negatively than parents. Implications of the findings are discussed.     

Effect of a novel pedal design on maximal power output and mechanical efficiency in well-trained cyclists

In this study, we evaluated the effects of a novel pedal design, characterized by a downward and forward shift of the cleat fixing platform relative to the pedal axle, on maximal power output and mechanical efficiency in 22 well-trained cyclists. Maximal power output was measured during a series of short (5-s) intermittent sprints on an isokinetic cycle ergometer at cadences from 40 to 120 rev min(-1). Mechanical efficiency was evaluated during a submaximal incremental exercise test on a bicycle ergometer using continuous VO(2) and VCO(2) measurement. Similar tests with conventional pedals and the novel pedals, which were mounted on the individual racing bike of the participant, were randomized. Maximal power was greater with novel pedals than with conventional pedals (between 6.0%, s(x) = 1.5 at 40 rev min(-1) and 1.8%, s(x) = 0.7 at 120 rev min(-1); P = 0.01). Torque production between crank angles of 60 degrees and 150 degrees was higher with novel pedals than with conventional pedals (P = 0.004). The novel pedal design did not affect whole-body VO(2) or VCO(2). Mechanical efficiency was greater with novel pedals than with conventional pedals (27.2%, s(x) = 0.9 and 25.1%, s(x) = 0.9% respectively; P = 0.047; effect size = 0.9). In conclusion, the novel pedals can increase maximal power output and mechanical efficiency in well-trained cyclists.     

Physical fitness and academic achievement in third- and fifth-grade students

The relationship between physical fitness and academic achievement has received much attention owing to the increasing prevalence of children who are overweight and unfit, as well as the inescapable pressure on schools to produce students who meet academic standards. This study examined 259 public school students in third and fifth grades and found that field tests of physical fitness were positively related to academic achievement. Specifically, aerobic capacity was positively associated with achievement, whereas BMI was inversely related. Associations were demonstrated in total academic achievement, mathematics achievement, and reading achievement, thus suggesting that aspects of physical fitness may be globally related to academic performance in preadolescents. The findings are discussed with regards to maximizing school performance and the implications for educational policies.     

未来气候变化对鄱阳湖区土地利用变化的影响评估

为了评估未来气候变化可能对鄱阳湖区土地利用变化产生的影响,本文根据IPCC的建议,利用新近建立的基于主体的土地利用变化模拟模型,详细分析了4种气候变化情景下鄱阳湖区1985-2035年的土地利用变化过程。这4种气候变化情景分别为A1B(经济高速增长模式)、A2(区域经济多样化增长模式)、B1(引进更多清洁能源的经济增长模式)和情景4(无气候变化模式)。在这些气候变化情景中,由于耕地的农业生产潜力差异显著,农户主体的收入和他们对土地利用方式的决策也发生了相应的改变。通过对这一过程的模拟和结果分析,发现气候变化可能有利于鄱阳湖区土地利用变化向着环境友好的方向自我调整。与A1B和A2两种气候变化情景相比,B1情景对土地利用变化的影响更具环境友好性。