Sprint start kinematics during competition in elite and world-class male and female sprinters     

Simone Ciacci  Franco Merni  Sandro Bartolomei 《Journal of sports sciences》2017,35(13):1270-1278

The start kinematics has been reported to differ between male and female sprinters. This study aimed to determine whether kinematic differences between the sexes are attributable to an effect of sex per se, or rather to the absolute performance level of the sprinters, quantified by the 100-m time. A total of 20 sprinters (10 M, 10 F), including world-class and elite athletes, were assessed. Start phases from the “set” position to the first two steps were analysed. Linear regression analyses showed a few significant differences between sexes when taking into account the effect of performance level: M had shorter pushing phase duration, higher horizontal velocity at block clearing, and shorter contact times of the first two steps. Conversely, the performance level affected most of the examined parameters: faster sprinters showed the centre of mass (CM) closer to the ground and a more flexed front knee in the “set” position, longer pushing phase duration, lower vertical velocity of the CM at block clearing, and longer contact times and shorter flight times in the first two steps. These findings suggest that the start kinematics is only partially affected by the sex of sprinters, whereas a bigger role is played by their performance level.  相似文献   

PISA for low- and middle-income countries     

Simone Bloem 《Compare》2015,45(3):481-486

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Eltern und Institutionen     

Simone Lehrl 《Zeitschrift für Erziehungswissenschaft》2016,19(4):815-821

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Supporting the Learning Process with Collaborative Concept Mapping Using Computer-Based Communication Tools and Processes     

Christina De Simone  Richard F. Schmid  Laura A. McEwen 《Educational Research and Evaluation》2013,19(2-3):263-283

University students are too often challenged by their limited skills in application, investigation, relational thinking, and communication of ideas. In this study, we have combined 3 tools that potentially can support and foster students’ development in the above mentioned areas through student collaboration, concept mapping, and electronic technologies. The participants in this study were 26 students in two intact classes in learning theories. In groups of 3 to 5 students, they were asked to generate 3 concept maps and accompanying prose over the term on 3 major issues in the field of learning. Through the use of interviews, questionnaires, and student generated concept maps, students reportedly enjoyed concept mapping for its organizational and relational properties but preferred sharing their concept maps and dialoguing with one another in a synchronous mode where immediate feedback and flow of thinking could be maintained when involved in constructing maps. Moreover, they did not like the redundancy offered by both prose and concept map outputs, suggesting that while concept mapping can be an arena for generating and generally structuring ideas, prose can be a means of communicating such ideas in a form that is common to most people. This is particularly important for teachers and students who have difficulty navigating through maps alone.  相似文献   

Networking From the Inside Out: Understanding Learners' Processes,Activities, and Experiences     

Christina De Simone  Richard F. Schmid 《Educational Research and Evaluation》2013,19(4-6):523-549

Research to date has demonstrated that networking can be an effective strategy for supporting meaningful learning. However, studies have shown that learners encounter difficulties using it. In an attempt to understand and thus reduce these difficulties, this study examined learners' underlying cognitive processes and activities while networking. Detailed process, observational, and post-activity interview data were gathered on 14 participants during and after their networking of an 800-word text. The study showed that learners must possess several forms of prior knowledge, and devote appropriate time and effort in order to derive benefits from networking. The instructional implications of the process and the methodological contribution of this study are discussed.  相似文献   

New Tools for Online Information Literacy Instruction     

Simone Williams 《The Reference Librarian》2013,54(2):148-162

This article investigates the new landscape of online information literacy tools, such as embedding resources into course management software and specific academic organizations' web sites and using podcasts, screencasts, blogs, Web-based board games, and virtual three-dimensional environments. This article also explores the influence these methods have on information literacy skills of undergraduate students.  相似文献   

Media and the Imaginary in History     

Simone Natale 《Media History》2013,19(2):203-218

This paper discusses how media theory and history should approach specimens of evidence about the cultural reception of media pertaining to the realms of the fantastic, such as speculations, predictions, dreams, and other forms of fantasy regarding media. It argues that the role of the imaginary in the history of media can be fully comprehended only by employing a perspective which is dynamic in time. In different phases of a medium's evolution, in fact, we find different fantasies; it follows that we need specific approaches to study them. The article discusses fantasies which are specific to three stages in media change: those preceding the actual invention of a medium; those accompanying the earliest period after the introduction of a new medium; and those connected to old media.  相似文献   

Emergent literacy activities in the final preschool year in the German federal states of Bavaria and Hesse     

Wilfried K. Smidt  Simone Lehrl  Yvonne Anders  Sanna Pohlmann-Rother  Katharina Kluczniok 《Early Years: An International Journal of Research and Development》2012,32(3):301-312

Emergent literacy activities are considered to be important for promoting children’s emergent literacy skills. However, little research exists, especially in Germany, regarding how often such activities occur and in what context. The purpose of this study was to determine the extent of emergent literacy activities occurring in the final preschool year, and their dependence on structural characteristics. Ninety-six children (mean age = 5.9) from 50 preschools in two German federal states were observed in their final preschool year. Results show that emergent literacy activities relating to print materials play a minor role, whereas activities involving oral language play a major role, compared with other activities in children’s preschool experience. Results also indicate a significant link between child-related, family and distal characteristics (i.e. geographic location and federal state affiliation) and the frequency of emergent literacy activities.  相似文献   

A study on a set of drawings by Parmigianino: integration of art-historical analysis with imaging spectroscopy     

Mauro Bacci  Andrea Casini  Costanza Cucci  Andrea Muzzi  Simone Porcinai   《Journal of Cultural Heritage》2005,6(4):329-336

Due to the extreme fragility of paper-based artefacts, few techniques are available for scientific investigation and characterisation of ancient drawings or paper-based artefacts. Image reflectance spectroscopy represents an almost unique tool for scientific analysis on precious drawings, for which even micro-invasive techniques of analysis cannot be used. Indeed, beside the high fragility of the support, drawings and graphical works are typically characterised by a very limited number of artistic materials, which in principle could give information on the work of art. In this paper an interdisciplinary study on a set of drawings by Parmigianino (1503–1540), selected from the collection of the Uffizi Gallery in Florence, is presented. Non-invasive measurements of image spectroscopy (IS) have been employed to support the work of art-historians in the critical re-examination and interpretation of the graphical work of the artist. The multispectral analysis has been carried out over the extended spectral region (400–1700 nm), in order to provide simultaneous indications both on the pictorial materials and on possibly underlying hatches. The data processing has been performed by means of Principal Component Analysis (PCA) and the elaboration of each case has been addressed to specifically respond to questions related to the art-historical problem.  相似文献   

Deleterious effects of obesity on physical fitness in pre-pubertal children     

Arianna Ceschia  Stefano Giacomini  Simone Santarossa  Miriam Rugo  Desy Salvadego  Alessandro Da Ponte 《European Journal of Sport Science》2016,16(2):271-278

The prevalence of obesity in children has increased dramatically during the past decades in Europe and understanding physical fitness and its components in children is critical to design and implement effective interventions. The objective of the present study was to analyse the association between physical fitness (aerobic, speed, agility, power, flexibility and balance) and body mass index (BMI) in pre-pubertal children. A total of 2411 healthy schoolchildren (7–11 years) participated in this study. Anthropometric characteristics and body composition were assessed by skinfold thickness. Physical fitness was measured by nine physical fitness tests: endurance running, 20 m running speed, agility, handgrip strength, standing long jump and squat jump, sit and reach, medicine ball forward throw and static balance. No relevant differences were observed between boys and girls regarding anthropometric characteristics, body composition and physical fitness. However, overweight and obese children showed significantly lower physical fitness levels in endurance running, speed and agility (mean: +18.8, +5.5 and +14.5% of time to complete tasks, respectively), lower limb power normalised to body mass (?23.3%) and balance tests (number of falls: +165.5%) than their normal weight counterparts. On the other hand, obesity did not affect handgrip, throwing and flexibility. In conclusion, increased BMI was associated with lower performance capabilities limiting proper motor skill development, which directly affects the ability of children to take on sports skills. Actions undertaken to promote children's wellness and fitness should be prioritised and introduced early in life with the aim of enhancing physical fitness as well as preventing overweight and obesity.  相似文献