Dynamics of the martial arts high front kick

Fast unloaded movements (i.e. striking, throwing and kicking) are typically performed in a proximo‐distal sequence, where initially high proximal segments accelerate while distal segments lag behind, after which proximal segments decelerate while distal segments accelerate. The aims of this study were to examine whether proximal segment deceleration is performed actively by antagonist muscles or is a passive consequence of distal segment movement, and whether distal segment acceleration is enhanced by proximal segment deceleration. Seventeen skilled taekwon‐do practitioners were filmed using a high‐speed camera while performing a high front kick. During kicking, EMG recordings were obtained from five major lower extremity muscles. Based on the kinematic data, inverse dynamics computations were performed yielding muscle moments and motion‐dependent moments. The results indicated that thigh deceleration was caused by motion‐dependent moments arising from lower leg motion and not by active deceleration. This was supported by the EMG recordings. Lower leg acceleration was caused partly by a knee extensor muscle moment and partly by a motion‐dependent moment arising from thigh angular velocity. Thus, lower leg acceleration was not enhanced by thigh deceleration. On the contrary, thigh deceleration, although not desirable, is unavoidable because of lower leg acceleration.     

输水渠道横断面设计水深测试及计算(综合性)实验

输水渠道横断面设计水深测试及计算实验结合“灌溉排水工程学”及“水力学”等学科的知识,在实验过程中,通过对实验数据的测试、分析及计算和渠道模型实物的观摩,加深了对渠道设计原理的理解,与课堂上的理论教学起到了良好的互动作用。     

A review of parent–professional partnerships and some new obligations and concerns arising from the introduction of the SEND Code of Practice 2015

This article contributes a current thematic review of literature about the challenges of productive parent–professional partnership working relating to children and young people with special educational needs and disabilities (SEND). It also reports on an empirical project which explored early experiences of professionals working under the newly statutory SEND Code of Practice 2015 and asks what new challenges have emerged for SEND parent‐partnerships. Particular consideration is given to the language of choice and preference in the Code, the new focus on outcomes in the place of specified provision, and the problematic construction of compliant partners.     

Why do long‐serving teachers stay in the teaching profession? Analysing the motivations of teachers with 10 or more years’ experience in England

This paper examines the reasons why long‐serving teachers remain in the teaching profession. Interest in teacher retention has grown in recent years, both in the UK and internationally, due to concerns over teacher shortage. However, most research on retention has focused on why teachers leave; this paper aims to fill the gap in our understanding of the positive reasons why long‐serving teachers stay in the profession, and how these reasons change over time. We define ‘long‐serving teachers’ as teachers who have taught for 10 years and more. We draw on a subset of data from an existing, broader study (Menzies et al., 2015 ) on why teachers enter and stay in the profession. In this paper, we draw on questionnaire findings from over 900 teachers with 0 to over 30 years’ teaching experience, and interviews with 14 long‐serving teachers, to understand why long‐serving teachers enter and, more importantly for our purposes, stay in teaching. We find that teachers’ motivational patterns are highly complex and influenced by school‐level and policy contexts. Nonetheless, two prominent retention factors are identified: teachers’ perceived professional mastery and altruistic reasons. Perceived professional mastery is particularly important due to its mutually reinforcing analytic relationships with other reasons. We find that teachers’ identification with intrinsic, altruistic and perceived professional mastery reasons become stronger with years of experience, but in some cases, paradoxically, so does their identification with extrinsic reasons. From our evidence, we suggest policy implications for enhancing the retention of long‐serving teachers.     

University physics students’ ideas of thermal radiation expressed in open laboratory activities using infrared cameras

Background: University physics students were engaged in open-ended thermodynamics laboratory activities with a focus on understanding a chosen phenomenon or the principle of laboratory apparatus, such as thermal radiation and a heat pump. Students had access to handheld infrared (IR) cameras for their investigations.

Purpose: The purpose of the research was to explore students’ interactions with reformed thermodynamics laboratory activities. It was guided by the research question: How do university physics students make use of IR cameras in open-ended investigation of thermal radiation as a phenomenon?

Sample: The study was conducted with a class of first-year university physics students in Sweden. The interaction with the activities of four of the students was selected for analysis. The four students are males.

Design and methods: We used a qualitative, interpretive approach to the study of students’ interaction. The primary means of data collection was video recording of students’ work with the laboratory activities and their subsequent presentations. The analysis focused on how IR cameras helped students notice phenomena relating to thermal radiation, with comparison to previous research on students’ conceptions of thermal radiation.

Results: When using the IR camera, students attended to the reflection of thermal radiation on shiny surfaces, such as polished metals, windows or a whiteboard and emissive properties of surfaces of different types. In this way, they went beyond using the technology as a temperature probe. Students were able to discuss merits and shortcomings of IR cameras in comparison with digital thermometers.

Conclusions: With the help of IR cameras, university physics students attend to thermal phenomena that would otherwise easily go unnoticed.     

开放教育教学资源共建共享——以现实困境与路径机制为中心的探讨

＂开放与共享＂是开放教育的本质,＂开放与共享＂的关键在于优质教学资源的供给。需求与供给的不平衡成为开放教育发展中的障碍,也成为开放教育的现实困境。教学资源的共建共享成为开放教育发展的必然选择,如何突破现有困境,找出开放教育共建共享的合理路径机制,是开放教育切实可行的发展之道。     

基于校企联合培养新机制的工程训练中心建设探索

根据实验教学与实践教育省级示范中心建设的最新要求,大力发展校内"中心"加校外"基地"的联合培养模式,积极探索工程训练中心新思路和新方向。以加强实践教学的研究性、创新性和实效性为目标,将现代装备制造工程训练中心建设成具有涵盖完整现代工业体系内容的工程训练实验教学基地。     

Conceptualizing an East Asian popular culture

Since the 1980s, popular cultural products have criss‐crossed the national borders of East Asian countries, enabling a discursive construction of an ‘East Asian Popular Culture’ as an object of analysis. The present essay is a preliminary attempt to provide some conceptual and analytic shape to this object, delineated by its three constitutive elements of production, distribution and consumption. Each East Asian location participates in different and unequal levels in each of these component processes. Production can either be located entirely in a single geographic location or, alternatively, each of the necessary constituent sub‐processes can be executed from different locations; preference for either arrangement tends to reflect the relative dominance of the production location in exporting its finished products. Consumption and thus consumers are geographically located within cultural spaces in which they are embedded. Meanings and viewing pleasures are generated within the local cultures of specific audience. Conceptually, among the several possible consumption positions, the one in which an audience watches an imported programme is most intriguing. In this viewing position, differences between the cultures of the location of consumption and that of the production location become most apparent. The audience member has to bring his or her own cultural context to bear on the content of the imported product and read it accordingly. In this sense, the cultural product may be said to have crossed a ‘cultural’ boundary, beyond the simple fact of its having been exported/imported into a different location as an economic activity. Such an audience position requires the consumer to transcend his or her grounded nationality to forge abstract identification with the foreign characters on screen, a foreignness that is, in turn, potentially reabsorbed into an idea of (East) ‘Asia’; a potential ‘East Asian identity’, emerging from consumption of popular cultural products, is thus imaginable.     

学术信息开放存取模式运行机制与前景探析

学术信息开放存取模式是一种新的信息交流和出版模式。本文在深入分析它的运行机制的基础上分析了它产生的原因，用历史演进的思想剖析了它的实质，并探讨了它将来的发展前景。     

新疆民族地区远程教育发展的矛盾及对策

远程教育是指学生与教师，学生和教育机构之间，采取多种媒体进行系统教学的教育形式，是确适应新疆幅员辽阔，财政紧张，经济发展滞后和缺乏师资的现实，但也面临着不少矛盾和亟待解决的问题，要在学习和借鉴远程教育先进经验的同时，办出具有新疆特色的，适合新疆多民族地区实施情况的远程教育。