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51.
Moura FA Martins LE Anido Rde O de Barros RM Cunha SA 《Sports biomechanics / International Society of Biomechanics in Sports》2012,11(1):85-96
The purpose of this study was to characterise Brazilian teams' coverage area and spread on the pitch while attacking and defending and to analyse the teams' organisation in tackle and shot on goal situations. We obtained the trajectories of 223 players in eight games with a tracking method. Team area was defined as the area of the convex hull formed by players' positions. Team spread was defined as the Frobenius norm of the distance-between-player matrix. We calculated teams' area and spread over time and in situations of shots on goal (n = 233) and tackles (n = 1897). While the players attacked, spread and area (median +/- confidence interval) ranged from 322.9 +/- 0.8 to 387.8 +/- 1.0 m and from 905.4 +/- 4.4 to 1407.6 +/- 5.5 m2, respectively. On defence, the values were smaller (p < 0.05) and ranged from 283.4 +/- 0.9 to 325.8 +/- 0.9 m and from 773.8 +/- 4.6 to 1158.4 +/- 5.5 m2 for the spread and the area. In defending circumstances, the teams presented a greater area and spread when they suffered shots on goal than when the teams performed tackles. In attacking situations, the teams presented a greater area and spread when they suffered tackles than when they performed shots on goal. The results allowed showing the attacking-defending interaction between Brazilian teams. 相似文献
52.
Osvaldo Luiz de Oliveira & Maria Cecília Calani Baranauskas 《British journal of educational technology : journal of the Council for Educational Technology》2000,31(2):153-161
Semiotics has recently been used to support formalisms for software design. On the other hand, every program has a certain educational potential as it exposes the user to a world of entities with which to interact. In this paper, we present a group of semiotic principles for software design and use them to show how they explain different educational possibilities. Our approach is illustrated by Theatre in the Computer: a software environment for children to experience the theatre. 相似文献
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54.
Luiz Gustavo Marin Emed Daniela Gunther Passaglia Surya T. Guerios Paula G. D. João André I. S. Moser Dulcinéia S. P. Abdalla 《Journal of sports sciences》2016,34(17):1657-1661
We aimed to evaluate the effects of a 24-h ultramarathon, an aerobic test of high physical load, on lipid profile and apolipoproteins B (ApoB) and A1 (ApoA1) levels, minimally modified low-density lipoprotein (LDL), and oxidised LDL. Prospective evaluation of 16 male athletes who participated in an ultramarathon run, where the objective was to run the greatest distance possible in 24 h. Fourteen participants completed the run. The mean distance achieved was 133.1 km (maximum of 169.6 km). There was a trend in reduction of triglycerides and total cholesterol (P = 0.06 and 0.05, respectively), without significant modifications in high-density lipoprotein, LDL and ApoA1 levels (P = 0.16; 0.55 and 0.67). There was a marked reduction in ApoB levels (P < 0.001), correlated directly to the distance covered (Pearson R = 0.68). Accordingly, an increase in the LDL/ApoB ratio was observed. The stress of this physical activity was not associated to an increase in minimally modified LDL or oxidised LDL. Lipid profile levels were not acutely altered by prolonged physical activity. Similarly, there was no evidence of greater oxidation of LDL over a 24-h period of physical activity. The reduction in ApoB was directly proportional to the distance covered, suggesting an acute positive change in phenotype of LDL molecules. 相似文献
55.
Luiz Marcelo de Carvalho Jorge Megid Neto Clarice Sumi Kawasaki Dalva Maria Bianchini Bonotto Ivan Amorosino do Amaral José Artur Barroso Fernandes 《Environmental Education Research》2018,24(10):1447-1463
AbstractThis article discusses an analysis of abstracts of Brazilian theses and dissertations on environmental education from a database organised and maintained by a group of researchers in the EArt Project (www.earte.net). In presenting extracts of key trends in this dataset, our aim is to provide a snapshot of the many possible approaches to, and histories of, Brazilian environmental education research. The data also allow us to raise some questions that explore possible ‘blank spots’, ‘blind spots’ and ‘bald spots’ in Brazilian research on environmental education. Given the temporal development of the research field since the 1980s, we illustrate these ‘spots’ by exploring data related to epistemological and methodological diversity, from the viewpoint of knowledge areas as well as the graduate programmes that have been developing research on environmental education. Finally, we draw a picture of the methodological trends that have been privileged by Brazilian researchers, and pose questions as to what is needed in shaping an agenda for research on environmental education in Brazil into the future. 相似文献
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de Oliveira Manoela Ziebell de Andrade Alexsandro Luiz Beria Francielle Machado Gomes William Barbosa 《International Journal for Educational and Vocational Guidance》2019,19(3):363-389
International Journal for Educational and Vocational Guidance - Studies indicate that the costs resulting from voluntary turnover range from 93 to 200% of the annual salary for a single position,... 相似文献
57.
Carla Luguetti Kimberly L. Oliver David Kirk Luiz Dantas 《Sport, Education and Society》2017,22(4):493-510
This study explores an activist approach for co-creating a prototype pedagogical model of sport for working with boys from socially vulnerable backgrounds. This paper addresses the key features that emerged when we identified what facilitated and hindered the boys’ engagement in sport. This study was an activist research project that was conducted between July 2013 and December 2013 in a soccer program in a socially and economically disadvantaged neighborhood in Brazil. The lead author, supervised by the second author, worked with a soccer class of 17 boys between ages 13 and 15, 4 coaches, a pedagogical coordinator and a social worker. Multiple sources of data were collected, including 38 field journal/observations and audio records of: 18 youth work sessions, 16 coaches’ work sessions and 3 combined coaches and youth work sessions. In addition, the first and second author had 36 90-minute debriefing and planning sessions. By using an activist approach, three features were identified as being essential: an ethic of care, an attentiveness to the community and a community of sport. Findings suggest that it is possible to use sport as a cultural asset to benefit youth from socially vulnerable backgrounds by offering them a place where they can feel protected and dream about possible futures. 相似文献
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Da Silva JF Guglielmo LG Carminatti LJ De Oliveira FR Dittrich N Paton CD 《Journal of sports sciences》2011,29(15):1621-1628
The aim of this study was to assess the validity (Study 1) and reliability (Study 2) of a novel intermittent running test (Carminatti's test) for physiological assessment of soccer players. In Study 1, 28 players performed Carminatti's test, a repeated sprint ability test, and an intermittent treadmill test. In Study 2, 24 players performed Carminatti's test twice within 72 h to determine test-retest reliability. Carminatti's test required the participants to complete repeated bouts of 5 × 12 s shuttle running at progressively faster speeds until volitional exhaustion. The 12 s bouts were separated by 6 s recovery periods, making each stage 90 s in duration. The initial running distance was set at 15 m and was increased by 1 m at each stage (90 s). The repeated sprint ability test required the participants to perform 7 × 34.2 m maximal effort sprints separated by 25 s recovery. During the intermittent treadmill test, the initial velocity of 9.0 km · h(-1) was increased by 1.2 km · h(-1) every 3 min until volitional exhaustion. No significant difference (P > 0.05) was observed between Carminatti's test peak running velocity and speed at VO(2max) (v-VO(2max)). Peak running velocity in Carminatti's test was strongly correlated with v-VO(2max) (r = 0.74, P < 0.01), and highly associated with velocity at the onset of blood lactate accumulation (r = 0.63, P < 0.01). Mean sprint time was strongly associated with peak running velocity in Carminatti's test (r = -0.71, P < 0.01). The intraclass correlation was 0.94 with a coefficient of variation of 1.4%. In conclusion, Carminatti's test appears to be avalid and reliable measure of physical fitness and of the ability to perform intermittent high-intensity exercise in soccer players. 相似文献
59.
Luiz Cláudio Andrade Souza 《Journal of The Franklin Institute》2011,348(4):777-789
This paper studies parameter estimation for a class of linear, continuous, time-varying dynamic systems whose state-space model's matrices are affine combinations of static matrix coefficients and the aforementioned time-varying scalar parameters. It is assumed that the coefficient matrices are all known, that the state is mensurable, and that the parameters are bounded piecewise continuous functions of time. Estimation methods are developed from basic equations for a single parameter first, and later extended to multiple parameters. 相似文献
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The quasi-totality of social scientists who studied screening for cervical tumours identified such screening with a single method: the Pap smear (exfoliative cytology). This article explains that this method was not valid everywhere. The history of screening for cervical cancer in Brazil displays an alternative method for detecting cervical malignancies: a direct observation of the cervix with a specific instrument--the colposcope. The development of this method in Brazil in the 1940s and 1950s reflected a complex mixture of professional interests, government policies, and regional, local and charitable initiatives. While the use of colposcopy for cervical tumour screening was phased out in the 1970s and 1980s, the long lifespan and widespread diffusion of this method illuminates the irreducible contingency of specific developments in science, technology and medicine. Seen from the vantage point of Brazil, the Western model for preventing cervical malignancies no longer appears self-evident Alternative choices might have led to the development of different material and visual cultures of medicine, stimulated different patterns of medical specialization and division of medical labour, produced different links between malignancies, women, gynaecologists, epidemiologists and public health experts, and shaped different health policies. 相似文献