A spectral analysis of team dynamics and tactics in Brazilian football     

Felipe Arruda Moura  Luiz Eduardo Barreto Martins  Ricardo O. Anido  Paulo Régis C. Ruffino  Ricardo M. L. Barros  Sergio Augusto Cunha 《Journal of sports sciences》2013,31(14):1568-1577

Abstract

The purposes of this study were to characterise the total space covered and the distances between players within teams over ten Brazilian First Division Championship matches. Filmed recordings, combined with a tracking system, were used to obtain the trajectories of the players (n = 277), before and after half-time. The team surface area (the area of the convex hull formed by the positions of the players) and spread (the Frobenius norm of the distance-between-player matrix) were calculated as functions of time. A Fast Fourier Transform (FFT) was applied to each time series. The median frequency was then calculated. The results of the surface area time series median frequencies for the first half (0.63 ± 0.10 cycles · min^?1) were significantly greater (P < 0.01) than the second-half values (0.47 ± 0.14 cycles · min^?1). Similarly, the spread variable median frequencies for the first half (0.60 ± 0.14 cycles · min^?1) were significantly greater (P < 0.01) than the second-half values (0.46 ± 0.16 cycles · min^?1). The median frequencies allowed the characterisation of the time series oscillations that represent the speed at which players distribute and then compact their team formation during a match. This analysis can provide insights that allow coaches to better control the team organisation on the pitch.  相似文献   

Approaches and Methodologies for a Course on History and Epistemology of Physics: Analyzing the Experience of a Brazilian University     

Katemari Rosa  Maria Cristina Martins 《Science & Education》2009,18(1):149-155

This paper is an analysis of inserting history and philosophy of science (HPS) in a physics undergraduate program at a Brazilian university. It is an examination of the approaches and methodologies adopted by professors of a History and Epistemology course. The course aims to have an explicit approach to HPS. The results suggest a concern of the Physics Institute regarding inserting these questions into physics teacher training programs. The study also uncovered that the professors who taught the subject had different visions of HPS.  相似文献   

The performativity of routines: Theorising the influence of artefacts and distributed agencies on routines dynamics     

Luciana D’Adderio 《Research Policy》2008,37(5):769-789

Drawing from advances in Organisational Studies and recent debates within Economic Sociology and the Sociology of Financial Markets, this paper proposes a theoretical framework that characterises the mutual adaptation between formal routines and rules, on one hand, and actual performances, on the other, as iterative cycles of framing, overflowing and reframing of knowledge inputs and actions. This framework, combined with the ethnographic observation of the ‘engineering freeze’ process at a leading automotive manufacturer, allows us to advance Routine Theory by (1) capturing the dynamics of convergence and divergence between procedures and performances; and (2) improving our understanding of the influence of artefacts and distributed agencies on routine evolution.  相似文献   

The development of nonverbal working memory and executive control processes in adolescents   总被引：1，自引：0，他引：1  

Luciana M  Conklin HM  Hooper CJ  Yarger RS 《Child development》2005,76(3):697-712

The prefrontal cortex modulates executive control processes and structurally matures throughout adolescence. Consistent with these events, prefrontal functions that demand high levels of executive control may mature later than those that require working memory but decreased control. To test this hypothesis, adolescents (9 to 20 years old) completed nonverbal working memory tasks with varying levels of executive demands. Findings suggest that recall-guided action for single units of spatial information develops until 11 to 12 years. The ability to maintain and manipulate multiple spatial units develops until 13 to 15 years. Strategic self-organization develops until ages 16 to 17 years. Recognition memory did not appear to develop over this age range. Implications for prefrontal cortex organization by level of processing are discussed.  相似文献   

大坝与坝基稳定性分析研究     

赵引 《东南大学学报》2004,20(4):508-512

大坝与坝基的稳定一直是工程师密切关注的一个安全问题. 论文提出2种分析重力坝和坝基稳定的方法: 一种是基于刚体极限平衡原理的直接分析方法, 它将坝体和岩基作为不变形的刚体, 利用该方法可直接计算出可能滑动面的安全因数; 另一种是基于弹塑性理论的间接分析方法, 它采用非线性有限元方法分析大坝和坝基的应力和变形. 根据收敛和突变准则来确定稳定安全度.结果表明:工程建筑物的破坏不仅仅是由于施加荷载的原因,同时也与组成材料的性质有关.  相似文献   

Knowledge about Science in Science Education Research from the Perspective of Ludwik Fleck’s Epistemology     

André Ferrer Pinto Martins 《Research in Science Education》2016,46(4):511-524

  相似文献   

Educating for trust     

Luciana Duranti  Corinne Rogers 《Archival Science》2011,11(3-4):373-390

Rapid technological advances are fuelling trust requirements and concerns about public and private sector records alike. To guarantee the reliability and authenticity of records requires a framework of policies, procedures, technologies, and intentional action or intervention by ??trusted custodians?? who have the knowledge required for attesting to and ensuring the continuing authenticity of the records. Records professionals have claimed the role of trusted keepers of the authentic record of our times, but how do they earn that trust? To begin, by acquiring competence. In order to define what kind of education would contribute to qualifying records professionals as competent, it is necessary to identify the components of knowledge they require and the role that society at large expects of them. The responsibilities and challenges presented by managing digital records through time are ones that records professionals should not meet in isolation. In order for records to be able to serve as evidence of actions and events, they must be protected as such. Records-related knowledge requirements are being articulated in the related disciplines of archival science and records management, law, digital forensics, and information assurance and cyber-security. The need for interdisciplinary knowledge to understand and manage the complexities of digital records is being realized in new research alliances that foster the development of knowledge that can support the role of trusted keepers of the authentic record of our times. One such alliance is the Digital Records Forensics Project at the University of British Columbia.  相似文献   

Teaching lessons in exclusion: researchers’ assumptions and the ideology of normality     

Luciana Benincasa 《International journal of qualitative studies in education》2013,26(8):1087-1106

Filling in a research questionnaire means coming into contact with the researchers’ assumptions. In this sense filling in a questionnaire may be described as a learning situation. In this paper I carry out discourse analysis of selected questionnaire items from a number of studies, in order to highlight underlying values and assumptions, and their ideological import. These studies all attempted to investigate attitudes that Greek pupils show towards fellow-pupils defined as ‘different’. The survey questions are organized in terms of types of diversity, and the data is interpreted through the concept of exclusion and the ideology of normality. I argue that a number of items in the questionnaires embody assumptions likely to encourage attitudes and practices potentially leading to the marginalization of children defined as ‘different’. Finally I suggest alternative approaches to researching pupils’ attitudes and point out implications for research training.  相似文献   

Sexuality and human reproduction: a study of scientific knowledge,behaviours and beliefs of Portuguese future elementary school teachers     

Luísa Veiga  Filomena Teixeira  Isabel Martins  António Meliço‐Silvestre 《Sex education》2013,13(1):17-29

Sex education in Portugal has become a right and an obligation starting in the first years of school. However, despite being required by legislation, this is not easy to achieve, partly because of weaknesses in the training of teachers, which need to be identified. In this study, data were collected about the knowledge, behaviours and beliefs of 148 teacher trainees of elementary education (6–10 years old) from two Portuguese public higher education institutions. The topic of sexuality and human reproduction had been covered by almost all of them during their initial training and was considered important by most of them. Nevertheless, about 85% asserted they are not confident enough to teach this topic to small children in a classroom and committed scientific errors about physiological‐anatomical aspects of the human body. All subjects felt that there is a lack of specific didactic materials, which does not help to overcome those obstacles. It was also possible to identify in these future teachers risky sexual practices resulting, in part, from their beliefs, which could have implications about the way the topic will be approached in the classroom. These findings show how essential it is for training institutions to pay greater attention to the education of future elementary school teachers in this area.  相似文献   

Rites of passage： A comparison of US,Malaysian and Brazilian adolescents     

Sherri Nevada McCarth  Luciana Karine de Souza  Jas Jafaar 《美中教育评论》2010,(11):88-98

This study compares the life events perceived as ＂rites of passage＂ from adolescence to adulthood by respondents between the ages of 14 and 23 in 3 countries and discusses the possible influences of culture and globalization on these perceptions. Participants include： （1） 250 adolescents from the US （125 males and 125 females）; （2） 191 adolescents from southeastern Brazil （70 males and 121 females）; and （3） 163 adolescents from Malaysia （76 males and 87 females）. These adolescents ranked a variety of life events which may be perceived as indicative of adult status by completing a questionnaire about perceived rites of passage. Although there were similarities among the 3 groups, several differences also emerged. The most commonly noted indicator of adult status for Malaysian youth was physical maturity, followed by completing one＇s education. Participants from the US cited financial independence as the major indicator of adult status, while those from Brazil cited the ability to make important decisions independently from family and to take responsibility for others, such as children, aging parents or a spouse. Brazilian youth were significantly more likely to cite a love affair and voting in major elections as rites of passage than were participants from the other 2 countries. Participants from the US were significantly more likely to cite military service, and Malaysian youth were significantly more likely to consider completion of education and achieving physical maturity as rites of passage. Gender and age differences within groups were evident on some items, but these were not consistent across groups. Possible explanations for the differences between countries and implications for educators working with adolescents in rapidly changing societies are discussed.  相似文献