中职模具制造技术专业UG NX课程翻转课堂实施策略探讨

目前,国内外翻转课堂已有众多比较成熟的模式可资借鉴。但是,具体到特定的专业(学科)、课程、班级和教学内容,却不能照搬现成模式和他人经验,而必须进行适当性的改造和调整。笔者选取中职模具制造技术专业UG NX课程,梳理其教学背景,探讨实施翻转课堂的必要性和可行性,通过4次课8课时的翻转课堂实践,总结出"促进前置学习""遵循小步子原则""组织分层教学"等策略,为中职专业课翻转课堂提供参考借鉴和研究案例。     

影响学生学习心理的因素及对策

探究学生学习心理的特点,对提高课堂教学效率起着积极的作用.教师要提高自身素质,调动学生的学习心理积极性,提高课堂教学质量.     

众包模式下参与动机对参与意愿的影响研究——基于金钱激励强度及任务复杂程度的视角

通过实验的方法探讨任务复杂程度对参与者动机的调节作用,并采用三组对照实验探索在不同金钱奖励情况下,任务复杂程度的调节作用是否会发生改变;同时,从实证角度探讨“挤出效应”是否存在.被试者通过众包任务情境模拟来回答量表问题,利用smartPLS进行数据分析和模型验证.结果表明,任务复杂程度负向调节内外动机对参与意愿的影响,且内外动机之间确实存在“挤出效应”.此外,在不同的金钱激励强度下,任务复杂程度对内外动机的调节作用不同.     

构建以学习为中心的远程开放教育管理机制

远程开放教育是利用网络技术、多媒体技术等现代信息技术手段开展起来的新型教育形式。在“人才培养模式改革和开放教育试点”工作之中,笔者发现远程开放教育的管理机制的改革调整势在必行。本文对远程开放教育管理模式、组织结构、教学策略等管理体制做了有益的探讨。     

中苏论战对毛泽东转变世界战争认识的影响--从"世界大战可以避免"到"世界大战不可避免"的观点变化

20世纪60年代后,毛泽东改变了原先“世界大战可以避免或推迟”的判断,突出地强调战争爆发的危险性,从而对中国的建设走向产生极大的影响。毛泽东这一判断变化的过程,与中苏两党关系的演变有着密切的关系。中苏两党从产生分歧、摩擦到公开论战,在一系列问题上形成对立,其中包括关于战争与和平问题的认识。中苏论战产生的影响是多层面的。从中苏论战的影响这一大背景,厘清毛泽东改变判断的原因,有助于更准确和更科学地作出历史的评价。毛泽东形成“战争不可避免”的观点以及对战争的高度警觉,决不是其个人主观意志的产物,而是在特定时代背景影响下、特殊历史事件作用下的结果。     

从认知语言学角度看英汉语时间概念隐喻的差异

英汉语在“时间是空间”、“时间流逝是运动”、“时间是金钱”、“时间是实体”等主要时间概念隐喻及相应的语言表达形式中虽有很多相同之处，但也存在着差异。这些差异来源于英汉不同的认知和社会文化背景。     

从第三种力量到北大西洋联盟——战后初期英国均势政策的变化

战后初期，英国外交经历了从寻求建立第三种力量，企图与美苏平起平坐，到推动建立北大西洋联盟，拉住美国保卫欧洲和英国的安全的变化过程。这一转变受英国国力衰弱、美国的欧洲政策、冷战的爆发的影响。     

A review of tennis racket performance parameters

The application of advanced engineering to tennis racket design has influenced the nature of the sport. As a result, the International Tennis Federation has established rules to limit performance, with the aim of protecting the nature of the game. This paper illustrates how changes to the racket affect the player-racket system. The review integrates engineering and biomechanical issues related to tennis racket performance, covering the biomechanical characteristics of tennis strokes, tennis racket performance, the effect of racket parameters on ball rebound and biomechanical interactions. Racket properties influence the rebound of the ball. Ball rebound speed increases with frame stiffness and as string tension decreases. Reducing inter-string contacting forces increases rebound topspin. Historical trends and predictive modelling indicate swingweights of around 0.030–0.035 kg/m² are best for high ball speed and accuracy. To fully understand the effect of their design changes, engineers should use impact conditions in their experiments, or models, which reflect those of actual tennis strokes. Sports engineers, therefore, benefit from working closely with biomechanists to ensure realistic impact conditions.     

Synchronized lower limb kinematics with pelvis orientation achieves the non-rotational shot

A non-rotational (NR) shot is now a well-known scoring move in soccer. To execute the NR shot, it is necessary to deprive the ball of any rotational forces during the impact phase. To execute the NR shot, it is natural that the force vector acting from the foot would pass through the ball’s center of gravity; however, the coordinated motion of the lower limb joint’s angular displacement and the pelvis is still unclear. The aim of this study is to estimate the coordinated leg and pelvis motion during the NR shot as compared to that during instep kicking. Four right-leg dominant college league players were asked to perform a NR shot and an instep kick a total of 10 times each. Hip, knee, and ankle joint angular displacements in the sagittal plane and pelvis yaw and roll rotational motions during both types of kicks were calculated with 14 IR reflective markers using a 3D real-time motion analysis system with a 250-Hz sampling. The Euclidean distances of the joint space of the NR shot and the instep kick were also calculated to detect similarities in the coordinated motion of the lower limb. The results showed that the lower limb joint motions in the sagittal plane were not different; however, the pelvis roll and yaw motions were apparently different, and these phenomena could simulate a pendulum motion with changes in both the vertical and horizontal displacements. These results suggest that the coordinated motion of the lower limb joint’s angular displacement shows high similarity between the NR shot and the instep kick, and the pelvis roll and yaw synchronized orientation is essential for achieving the NR shot.     

Elite wheelchair rugby: a quantitative analysis of chair configuration in Australia

Limited recommendations of wheelchair configurations for court sports have been identified in the published literature. To accommodate the wide range of impairments in wheelchair rugby, players are given a point score that reflects their impairment. Players have regularly been grouped as high-, mid-, or low-point players in research, with high-point players having greater levels of muscle function compared with other classifications. This research documented the wheelchair configurations of elite Australian wheelchair rugby players across classification groups. Significant differences (p < 0.05) were found for increased seat height and decreased seat depth for high-point players compared with low- and mid-point groups, respectively. Low-point players displayed reduced wheelchair mass compared with high- and mid-point players, as well as increased frame length. Camber angles showed no significant differences across the classification groups. The incorporation of anthropometric measures, such as the elbow angle at the top dead center, was also investigated. While elbow angle showed no significant differences, seat height-to-total arm length ratio was higher for high-point players. Participants also completed surveys detailing their perception of the effect of altering wheelchair configurations. It is suggested that wheelchair configurations should consider an individual’s anthropometrics, impairment, training history, and court role to promote optimal performance, with predictive modeling having the potential to reduce the associated time and cost.