排序方式： 共有59条查询结果，搜索用时 31 毫秒
1.
Rony Ibrahim Gert S. Faber Jaap H. van Dieën 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(1):45-57
Attaining high speed of the stick head and consequently of the ball is essential for successful performance of the drag flick in field hockey, but the coordination pattern used to maximise stick head speed is unknown. The kinematics of the drag flick was studied in ten elite hockey players who performed twenty shots each towards a target located 1.5 m high. A 150 Hz active marker motion analysis system was used, alongside two force plates to detect foot touchdown. Angular velocity and contribution to stick endpoint speed of upper body joints were analysed. Repeated measures ANOVA was used to compare timing of onset and peak angular velocities between joints. Participants used a kinematic pattern that was close to a proximal-to-distal sequence. Trunk axial rotation and lateral rotation towards the target, right wrist flexion and left wrist extension were the main contributors to stick endpoint speed. Coaches should emphasise trunk rotations and wrist flexion and extension movements for maximising stick head speed. Given the high level of the participants in this study, the coordination of joints motions, as reported here, can serve as a guideline for drag flick training. 相似文献
2.
Brenton Faber 《Technical Communication Quarterly》2006,15(2):141-169
This study examines the representations of nanoscale science and technology in written popular media from 1986 to 1999. Nanoscale science is an emergent field that examines the principles of matter at a molecular level. This article presents the representations through which nanoscale science and technology was initially introduced to the public. Written popular media influences the ways stakeholder groups perceive, support, and fund science and technology. From 1986 to 1999 this field was introduced to the general public through articles in newspapers, magazines, and other general interest publications. During this period, nanoscale science and technology had a fragmented public image as proponents of various representations of the field competed for legitimacy. The study demonstrates that the emergence of nanoscience and technology in the popular media occurred as a competitive and transitional social-rhetorical process in which the new emerged within existing and established understandings of science but was mediated by biographical and other social accounts of the research. 相似文献
3.
Tove Midtsundstad 《European Journal of Education》2019,54(1):13-29
Because of rising life expectancy and declining birth rates, reducing early retirement and prolonging employees’ working lives have become major goals on social policy agendas. In this context, ensuring the adaptability and employability of the existing workforce has become an important issue. The aim of this article is to conduct a review of the most recent literature on employment outcomes of adult learning. The review covers literature published in English since 2010. 相似文献
4.
Irene R. Faber Maria W. G. Nijhuis-Van Der Sanden Marije T. Elferink-Gemser Frits G. J. Oosterveld 《Journal of sports sciences》2015,33(11):1149-1158
A motor skills assessment could be helpful in talent development by estimating essential perceptuo-motor skills of young players, which are considered requisite to develop excellent technical and tactical qualities. The Netherlands Table Tennis Association uses a motor skills assessment in their talent development programme consisting of eight items measuring perceptuo-motor skills specific to table tennis under varying conditions. This study aimed to investigate this assessment regarding its reproducibility, internal consistency, underlying dimensions and concurrent validity in 113 young table tennis players (6–10 years). Intraclass correlation coefficients of six test items met the criteria of 0.7 with coefficients of variation between 3% and 8%. Cronbach’s alpha valued 0.853 for internal consistency. The principal components analysis distinguished two conceptually meaningful factors: “ball control” and “gross motor function.” Concurrent validity analyses demonstrated moderate associations between the motor skills assessment’s results and national ranking; boys r = ?0.53 (P < 0.001) and girls r = ?0.45 (P = 0.015). In conclusion, this evaluation demonstrated six test items with acceptable reproducibility, good internal consistency and good prospects for validity. Two test items need revision to upgrade reproducibility. Since the motor skills assessment seems to be a reproducible, objective part of a talent development programme, more longitudinal studies are required to investigate its predictive validity. 相似文献
5.
Tove Faber Frandsen 《Learned Publishing》2019,32(1):57-62
Peer review is a cornerstone of scientific publication, and consequently, predatory journals are feared to be a threat to the credibility of science as they perform no or low‐quality peer review. The question of why researchers decide to publish in a questionable journal remains relatively unexplored. This paper provides an overview of the existing literature on why researchers decide to publish papers in questionable journals, specifically whether or not they search for a low‐barrier way to getting published while being aware that the chosen journal probably does not adhere to acceptable academic standards. The choice of a publication outlet can be seen as a submission tree that consists of various incentives, and explaining why authors publish in deceptive journals may thus consist of a combination of awareness and motivational factors. Awareness and motivation of diligent authors is very different from that of unethical authors. Unethical authors may use a lack of awareness to excuse their actions, but they may actively search for a low‐barrier way to getting published. As there are different types of authors who publish in deceptive journals, we need different approaches to solve the problem. 相似文献
6.
Niels R. Faber Laura Maruster René J. Jorna Rob J.F. van Haren 《Educational Research and Evaluation》2013,19(6):519-539
In small businesses with no employees, learning environments have a low learning readiness. Consequently, learners need to rely on their own agency to shape their learning experiences. Results from a study of agricultural entrepreneurs indicated that the components of motivation and self-regulated learning strategies shape learner's agency and explain learning environment configuration in small businesses with no employees. Configuration of the learning environment was found to be a weak determinant of the learning performance of these learners. However, results showed that prior performance of learners in small businesses with no employees dictates how their agency operates and what learning effect is achieved; higher prior performance results in higher learning effects. We conclude that mechanisms that underlie learning in traditional learning environments work similarly in learning environments in small businesses with no employees. 相似文献
7.
How do young people experience camp, and how might that experience help us expand our understanding of what is possible in non-formal learning environments? In-depth interviews consisting of forced-choice and open-ended questions were conducted with 59 Concordia Language Villages residential camp participants who partake in a linguistically and culturally enriched grand simulation. This study focused on (1) quantitative assessments of their sense of safety and belonging, and (2) open-ended questions about the nature of the camp environment in general and as a learning place. From the qualitative data, we distilled participants’ sense of camp as a learning place by analysing their responses in terms of theoretically-driven categories of thinking space qualities and data-driven categories of experience space qualities. As a thinking space, participants described the camp environment as a safe space characterized by support for thinking and development, room for identity-supportive interactions, room to experiment, and a place with mentoring adults and a second-home feeling. As an experience space, they emphasized the centrality of the program’s daily activities (particularly simulations), the qualities of the people around them (diverse and community-focused), the physical setting of the program (particularly its aesthetics) and the instructional methods used (particularly language and cultural immersion). The relationship of these findings to our understanding of the nature of the thinking and experience spaces as program-specific and program-general phenomena is discussed. 相似文献
8.
Kamasha Robertson Johan Pion Mireille Mostaert Mohd Rozilee Wazir Norjali Wazir Tamara Kramer Irene Renate Faber 《Journal of sports sciences》2018,36(23):2706-2715
ABSTRACTDifferences and similarities between table tennis and other racquet sports exist, but are not well documented in the literature, in spite of the relevance for talent identification. In this study we aimed at identifying the key characteristics of table tennis in comparison with tennis and badminton based upon a survey in coaches. A total of 177 licensed coaches from all across the world and with diverse professional backgrounds completed a survey on anthropometric measures, physical performance, and motor coordination skills. On a scale from 1 to 10, coaches indicated to what extent a talent characteristic was important for their sport. MANOVA identified key differences as well as similarities between all three racquet sports and a subsequent discriminant analysis allocated coaches correctly for table tennis, tennis, and badminton 81.01%, 55.6%, and 71.4% respectively. Our results show that table tennis and other racquet sport coaches are well aware of differences between the racquet sports and also the importance and value of testing and assortment of skill components. These findings can assist coaches in future talent orientation and transfer in racquet sports. 相似文献
9.
Lotte L. Lintmeijer Gert S. Faber Hessel R. Kruk A. J. “Knoek” van Soest Mathijs J. Hofmijster 《European Journal of Sport Science》2018,18(7):940-946
For a valid determination of a rower’s mechanical power output, the anterior–posterior (AP) acceleration of a rower’s centre of mass (CoM) is required. The current study was designed to evaluate the accuracy of the determination of this acceleration using a full-body inertial measurement units (IMUs) suit in combination with a mass distribution model. Three methods were evaluated. In the first two methods, IMU data were combined with either a subject-specific mass distribution or a standard mass distribution model for athletes. In the third method, a rower’s AP CoM acceleration was estimated using a single IMU placed at the pelvis.Experienced rowers rowed on an ergometer that was placed on two force plates, while wearing a full-body IMUs suit. Correspondence values between AP CoM acceleration based on IMU data (the three methods) and AP CoM acceleration obtained from force plate data (reference) were calculated. Good correspondence was found between the reference AP CoM acceleration and the AP CoM accelerations determined using IMU data in combination with the subject-specific mass model and the standard mass model (intraclass correlation coefficients [ICC] >?0.988 and normalized root mean square errors [nRMSE]?3.81%). Correspondence was lower for the AP CoM accelerations determined using a single pelvis IMU (0.877?Based on these results, we recommend determining a rower’s AP CoM acceleration using IMUs in combination with the standard mass model. Finally, we conclude that accurate determination of a rower’s AP CoM acceleration is not possible on the basis of the pelvis acceleration only. 相似文献
10.
The greatest number of open access journals (OAJs) is found in the sciences and their influence is growing. However, there are only a few studies on the acceptance and thereby integration of these OAJs in the scholarly communication system. Even fewer studies provide insight into the differences across disciplines. This study is an analysis of the citing behaviour in journals within three science fields: biology, mathematics, and pharmacy and pharmacology. It is a statistical analysis of OAJs as well as non-OAJs including both the citing and cited side of the journal to journal citations. The multivariate linear regression reveals many similarities in citing behaviour across fields and media. But it also points to great differences in the integration of OAJs. The integration of OAJs in the scholarly communication system varies considerably across fields. The implications for bibliometric research are discussed. 相似文献