Comparison of advanced and intermediate 200-m backstroke swimmers' dominant and non-dominant shoulder entry angles across various swimming speeds     

Andrews C  Bakewell J  Scurr JC 《Journal of sports sciences》2011,29(7):743-748

During backstroke, an optimum shoulder entry angle of 180° has been anecdotally suggested; however, this has yet to be investigated biomechanically. The aim of this study was to quantify shoulder entry angles for advanced and intermediate backstroke swimmers. Six advanced (season's best?<150?s) and six intermediate (season's best?>160?s) 200-m backstroke swimmers had markers applied to the medial humeral epicondyles and glenoid cavities. Following a familarization period, participants completed backstroke swimming trials (90?s each) in a swimming flume at 50%, 60%, 70%, and 80% of their season's best 200-m velocity. A camera positioned above the flume recorded frontal plane motion, which was digitized and analysed in Simi Motion Systems. The mean peak angle between the upper arm and the line of progression was established in ten strokes for each participant. The results showed backstroke shoulder entry angles for advanced swimmers (170°) were significantly closer to the suggested optimum 180° compared with those of intermediate swimmers (161°). The non-dominant arm displayed values closer to the optimum (171°), while swimming speed had no effect on backstroke shoulder entry angle. In conclusion, backstroke shoulder entry angle may help discriminate between advanced and intermediate backstroke swimmers and may be influenced by laterality dominance, being independent of swimming speed.  相似文献   

Use and evaluation of information from social media: A longitudinal cohort study     

Kyung-Sun Kim  Sei-Ching Joanna Sin  EunYoung Yoo-Lee 《Library & information science research》2021,43(3):101104

This cohort study examined longitudinal changes in undergraduates' use of social media as information sources in academic and everyday-life contexts, covering types of social media used, purposes of use, and evaluation strategies. Web surveys were used, collecting data from 1,355 and 928 undergraduates in 2013 and 2019. The study found that students used most types of social media less in 2019 than 2013 in both contexts. Only media-sharing services bucked this downward pattern. Overall, a majority of social media types underwent changes in the top three purposes of use. The 2019 cohort used most evaluation strategies more frequently in both contexts. However, they favored simplistic strategies relying on superficial physical cues when evaluating information. Based on the findings, this study provided recommendations for information literacy education and interface design, such as covering multimedia information evaluation, leveraging various heuristics to prime careful use of social media and analytical evaluation of information.  相似文献   

Functions of digital learning within the international mobility programme – perspectives of university students and staff from Europe     

Leek  Joanna  Rojek  Marcin 《Education and Information Technologies》2022,27(5):6105-6123

Education and Information Technologies - This paper is based on research studies conducted in the academic community of students and staff members (teachers, researchers and administrative staff)...  相似文献   

学生合约与学生消费者：学习的市场化与高等教育公共产品性质的侵蚀     

拉亚妮&#;奈杜  乔安娜&#;威廉斯 《北京大学教育评论》2014,(01):36-52,188

自20世纪80年代中期以来,全世界范围内接连出现的政府主导的改革将高等教育系统向"教科书般"经济市场越推越近已实施的改革包括公司化、引入竞争性资助、增加学费和其他费用、使用高校管理中产出模式和绩效报告。但是,没有一个国家面向本国学生的第一学位教育是按照真正的资本主义经济市场来运作的,没有研究型大学的发展是被股东、利润、市场份额、配置效率或商品形式所驱动的。在一些国家,只有职业培训和国际教育才会真正收取商业性质的学费。虽然高等教育中普遍存在激烈的竞争、企业家精神和消费者话语,但资本主义在其中没有一席之地;现有的高等教育市场充其量是一个受监管的准市场在许多国家,高等教育领域的"市场改革"不同于交通、通信、广播电视和医疗保险界的私有化和商业化。究其原因,本文发现真正的市场改革受制于高等教育领域特定的内在限度(公共产品、地位竞争)以及与这些限度相关的政治因素、高等教育市场改革计划在本质上是乌托邦式的,目前市场改革的抽象理想仍在持续并不是因为它具有真正实现的前景,而是由于外源性政策的推动(如财政缩减、政府控制等)。如果资本主义市场是无法实现的,为什么要继续假装它们可以实现呢?我们需要一个与教育系... 更多还原  相似文献   

Polish Higher Education     

Joanna Musial 《欧洲教育》2014,46(3):55-74

This study analyzes degrees of differences between the private and public sectors of Polish higher education. It finds them to be strong: Polish private institutions function very differently from Polish public institutions and these differences correspond with those found in the literature on higher education elsewhere in the world. Polish intersectoral differences follow directions anticipated from the global literature. The study also provides material usable in policymaking by government agencies, public-private universities, and families.  相似文献   

Using a Core Text with Bilingual Children     

Joanna Eade 《English in Education》1997,31(3):32-39

This study shows how the achievement of bilingual learners can be raised within the classroom context and within the framework of the National Curriculum. One text was used to stimulate a wide variety of language activities including using different styles and structures, having a sense of audience and an extended vocabulary, and exploring the children's own experiences and beyond.  相似文献   

Book reviews     

Pamela Spence Richards 《Publishing Research Quarterly》1986,2(1):85-88

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Infants' attention to patterned stimuli: developmental change from 3 to 12 months of age     

Courage ML  Reynolds GD  Richards JE 《Child development》2006,77(3):680-695

To examine the development of look duration as a function of age and stimulus type, 14- to 52-week-old infants were shown static and dynamic versions of faces, Sesame Street material, and achromatic patterns for 20 s of accumulated looking. Heart rate was recorded during looking and parsed into stimulus orienting, sustained attention, and attention termination phases. Infants' peak look durations indicated that prior to 26 weeks there was a linear decrease with age for all stimuli. Older infants' look durations continued to decline for patterns but increased for Sesame Street and faces. Measures of heart rate change during sustained attention and the proportion of time spent in each phase of attention confirmed infants' greater engagement with the more complex stimuli.  相似文献   

The chameleon on a tartan rug: adaptations of three academic developers’ professional identities     

Barbara Kensington-Miller  Joanna Renc-Roe  Susan Morón-García 《International Journal for Academic Development》2013,18(3):279-290

This paper builds on discussions of academic developers’ identity experienced as a discomfiting, troubled, and often marginal space. Three experienced academic developers, located in research-intensive institutions in three different countries, using auto-ethnographic writing and a shared narrative inquiry, explore moments of congruence and conflict. While there are elements that sustain them in their job, the categorisation of their role can impact on their ability to do their job, undermining their credibility. This can prevent them from engaging in research that could enrich practice in their institutions and inform institutional strategy or change the culture in teaching and learning. Instead they are forced into discomfit: having to defend their right to be involved in the institutional discussions. The most worrying issue is the pervasive trend in the change of academic developers’ status (from tenure-track academic peers to professionals).  相似文献   

A Study in Management Innovation     

Kelvyn Richards 《School Leadership & Management》2013,33(2):149-156

Fourteen early retiring primary headteachers in individual and group interviews discussed their decision to apply for early retirement. Retirement decisions were affected by ‘pushes’ from the system and ‘pulls’ towards retirement. Perceived pushes were external pressures, job expansion/overload, bureaucracy, local authority support, loss of job satisfaction and school relationships. Pulls comprised ‘facilitators’ (personal and financial) and ‘gains’ (control, opportunities, health and family). Pushes against retirement comprised losses of positive school relationships, role and status, job challenge and time structure. Early retirement amongst these headteachers appeared to derive from current retirement trends, job stress and lack of management support.  相似文献