New curve sprint test for soccer players: Reliability and relationship with linear sprint     

Alberto Fílter  Jesús Olivares  Alfredo Santalla  Fabio Y. Nakamura  Irineu Loturco  Bernardo Requena 《Journal of sports sciences》2020,38(11-12):1320-1325

ABSTRACT

The speed performance is involved not only in linear sprints, but also in a wide spectrum of multi-directional movements, such as curve sprinting. Curved sprint can be defined as sprint with gradual and continuous change of direction (COD). Although ~85% of the actions performed at maximum velocity in a professional soccer league are curvilinear sprints, there is not any specific test to assess this ability. This study aimed to analyse the reliability of a new curve sprint test, and compare its results with those obtained by soccer players in linear sprint. Forty experienced soccer players performed 3 attempts of curve sprint (using the penalty arc) to right and left side (17 m), and 3 linear sprints (17 m) in two different days. The ICCs (inter-session reliability) were 0.93 for sprint curve right side (CSRS) and 0.89 for sprint curve left side (CSLS), considered “acceptable”. The CVs (intra-session reliability) were 0.87% in CSRS and 1.15% in CSLS. The coefficient of determination (R²) between linear and curve sprinting was ~35%. The association between curve sides was “very large” (r = 0.878; p < 0.01). In summary, we showed that “curve sprint test” is highly reliable, and that curvilinear and linear sprints are different and independent actions.  相似文献   

新中国成立70年来体育教育专业人才培养的演变与特征分析     

周红萍  吕万刚 《武汉体育学院学报》2020,54(8):65-71

研究新中国成立70年来体育教育专业人才培养特征与演变规律，是呈现体育教育专业发展历史的需要，是推动体育教育专业发展和改革的一项基础性工程。采用文献资料法、历史法、专家访谈法和逻辑分析法，对体育教育专业发展规模、专业定位、培养方案、课程设置、教学模式等方面开展研究，结果表明：新中国成立70年来，体育教育专业经历了学习与移植、探索与挫折、混乱与恢复、开放与改革、提速与跨越、实践与创新的演变过程。表现出专业规模不断扩大、培养目标由单一向多元发展、课程设置逐渐模块化和弹性化、选修课和实践课学时逐步增加、总学分缓慢降低、人才培养模式多样、教学方法不断更新等特征。这些演变是基于国际国内的政治、经济、文化和科技发展的历史缘由。当下，专业认证已全面铺开，坚持"一流专业"建设是培养卓越体育教师的根与本。  相似文献   

Fair student assessment: A phenomenographic study on teachers’ conceptions     

《Studies in Educational Evaluation》2020

This research focuses on understanding teachers’ conceptions of what constitutes a fair assessment. In recent decades the number of studies seeking to learn about teachers’ conceptions on assessment has multiplied. The idea is simple, and involves the extent to which conceptions have an effect on what happens in practice. With this aim, a phenomenographic study was carried out to understand what is a fair assessment from teachers’ perspectives. Despite the importance of conducting phenomenographic studies in education, in Spain hardly any studies have used this methodology. Participants were 30 teachers at primary/secondary schools in Spain. The results show that teachers' conceptions of fair assessment were divided, some being more closely related to the principle of equality and others to equity. The conclusion of this study highlights the influence of the school context on teachers’ conceptions of what constitutes fair assessment (in the research, there were 15 teachers who worked in schools located in low socioeconomic status contexts and 15 who were in high socioeconomic status environments).  相似文献   

Difference score reliabilities within the RIAS-2 and WISC-V     

Ryan L. Farmer  Samuel Y. Kim 《Psychology in the schools》2020,57(8):1273-1288

Many prominent intelligence tests (e.g., Wechsler Intelligence Scale for Children, Fifth Edition [WISC-V] and Reynolds Intellectual Abilities Scale, Second Edition [RIAS-2]) offer methods for computing subtest- and composite-level difference scores. This study uses data provided in the technical manual of the WISC-V and RIAS-2 to calculate reliability coefficients for difference scores. Subtest-level difference score reliabilities range from 0.59 to 0.99 for the RIAS-2 and from 0.53 to 0.87 for the WISC-V. Composite-level difference score reliabilities generally range from 0.23 to 0.95 for the RIAS-2 and from 0.36 to 0.87 for the WISC-V. Emphasis is placed on comparisons recommended by test publishers and a discussion of minimum requirements for interpretation of differences scores is provided.  相似文献   

The zone of proximal creativity: What dynamic assessment of divergent thinking reveals about students’ latent class membership     

《Contemporary educational psychology》2021

Divergent Thinking is a domain-general mental attribute closely associated with creativity that can be quantified through the use of text-mining algorithms. Past research has shown that students’ Divergent Thinking is malleable in response to relatively simple contextual prompts. In addition, there is substantial variance in the degree to which individual students’ Divergent Thinking is malleable, suggesting the presence of a student-specific zone-of-proximal-development in relation to creativity. Here, we adopted a dynamic assessment paradigm that included multiple conditions under which student Divergent Thinking was measured and fit a latent profile analysis model to that dynamic assessment data. We found that, although on average the Originality of student responses can be augmented through a prompt to generate surprising or unusual ideas, three latent classes emerged that differed significantly on their patterns of augmentation. These three latent classes were termed: (a) Conventional Thinkers (7.80% of the sample), whose response to the Divergent Thinking task were highly constrained and unoriginal across all conditions (b) Prompted Shifters (66.56%), whose Originality significantly increased across conditions, and (c) Idea Generators (25.64%), whose responses were highly original across all conditions. These latent profiles were validated in regard to personality characteristics and domain-specific creative activities, with Idea Generators reporting significantly more Openness and Intellect, less Industriousness, and more creative activities across the domains of Literature, Music, Sports, Visual Art, Science, and Cooking than did the other latent classes.  相似文献   

战略性新兴产业与经济发展耦合协调发展研究——基于安徽省的实证研究     

谢国根 《科技管理研究》2018,(22)

基于系统耦合理论,对安徽省战略性新兴产业系统与区域经济系统的耦合协调发展状况进行测度和系统评价。结果显示,安徽省大多数地级市的战略性新兴产业与区域经济并未实现同步型发展,但两者发展的一致性程度在逐渐提升;就两者耦合协调度而言,总体偏低,大多数地级市仍处在中低度耦合阶段,但在时间序列上呈现逐渐提升的态势,总体状况趋于良性发展;在空间格局上,耦合协调度一定程度上呈现以合肥、芜湖为中心逐渐向外围扩散的趋势,但中心城市对周边地区耦合协调程度提升的辐射和带动作用还有待进一步加强。  相似文献   

海洋类中文科技期刊发展思考——以《海洋科学进展》为例     

李燕  胡筱敏  陈靖  王燕 《中国科技期刊研究》2018,29(1):79-83

【目的】 分析《海洋科学进展》和《海洋学报》的高被引论文，为《海洋科学进展》的发展和创新提供参考。【方法】 通过中国知网检索《海洋科学进展》和《海洋学报》的高被引论文，从被引频次、下载次数、论文类型、学科分布及第一作者等信息分析了两刊优势学科、高被引论文类型，并对两刊被引频次及下载次数进行相关性分析。【结果】 对两刊近10年被引频次排名前20论文的下载次数和被引频次进行了相关性分析，发现其相关系数均大于0.5；对两刊在网络盛行前后各5年被引频次排名前50论文的被引频次及下载次数进行相关性分析，发现网络发展使得其相关性均有下降趋势。【结论】 网络发展加剧了期刊间的竞争，期刊的数字化建设不容忽视。在日趋平等、便利的网络平台上，准确的期刊定位和具有原创性观点的高质量论文仍是科技期刊发展的根本。  相似文献   

基于核心论文数量和被引频次双重分布的百分位数指标改进研究     

汪莉 《中国科技期刊研究》2018,29(4):400-405

【目的】 改进现有百分位数指标在揭示期刊载文量特征方面的不足，构建基于被引频次与载文量双重分布的期刊评价指标PRC。【方法】 以2016版《期刊引证报告》生物学学科的85种期刊为研究样本，通过二八定律筛选核心论文样本集，利用布拉德福区域分析法设计基于文献密度分布的载文量权重，利用百分位数建立基于被引频次分布的引文指标，构建期刊综合影响力评价指标PRC。比较PRC与其他文献计量指标的相关性，验证指标评价效果。【结果】 PRC不仅在一定程度上克服了影响因子的内在缺陷，也能合理揭示期刊的出版规模效应，很好地均衡了相对值和绝对值两类指标，改进了百分位数指标的评价效果。【结论】 PRC指标兼顾被引频次和载文量双重分布，从数量和质量两个维度衡量期刊影响力，可用于评价科技期刊的学术影响力。  相似文献   

商业模式动态演化机制：基于互联网业的多案例内容分析          下载免费PDF全文

张新香  胡立君 《科研管理》2018,39(3):110-121

本文根基商业模式内涵，构建商业模式结构模型，依据发展历程收集5家代表案例企业时间序列新闻文献和数据资料，运用内容分析法结构化分析文献资料，提炼互联网业商业模式动态演化规律和演化路径。研究显示：互联网业商业模式中，价值定义、价值实现、价值创造与传递三大构件的主导地位依次更替，对应呈现出客户价值实现、企业价值实现和网络价值实现的纵向三阶段演化模型，三阶段模型在时间跨度和运营绩效上与企业生命周期的创业期、发展期和成熟期很好吻合，商业模式的三大构件同样呈现出动态演化特征。本研究试图打开商业模式的组成结构黑箱，将商业模式的设计理论从静态视角升级到动态层面，为互联网业的发展给出可行的实践参考。  相似文献   

数字内容传输渠道对消费者行为的影响研究          下载免费PDF全文

朱建学  熊励 《科研管理》2018,39(9):42-51

根据个人理性约束和激励相容约束，基于期望效用理论构造了数字内容消费者行为模型，运用计算机仿真技术分析了消费者的数字内容消费数量及其效用变化情况，研究了数字内容传输分发渠道对消费者行为的影响。研究结果表明：（1）在传统传输分发渠道下，数字内容价格对消费者数字内容消费数量及其效用影响显著，是影响消费者行为的重要因素；（2）在数字化网络传输分发渠道下，会员制收费模式的会员费直接影响消费者效用，按交易量收费模式通过数字内容消费数量间接影响消费者效用；（3）在双重传输分发渠道下，消费者效用和数字内容消费数量均高于上述传输分发渠道。综上可得，双重传输渠道更加符合消费者利益，为了体现消费者日益增强的影响力和主导权，数字内容供应商应该实施双重传输分发渠道策略。  相似文献