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水平二乒乓球正手平击发球教学设计
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作者 曹爽 温倩倩 《体育教学》 2015年第4期56-58,共3页
基本构思依据水平二学生会做简单的组合动作的目标,本课选择了正手平击发球来发展学生左右手的协调配合能力。水平二学生活泼好动,喜欢趣味性游戏,教师在学习过程中根据学生掌握发球的不同程度,设定了继续练习发球(技能)、运用呼啦圈... 基本构思依据水平二学生会做简单的组合动作的目标,本课选择了正手平击发球来发展学生左右手的协调配合能力。水平二学生活泼好动,喜欢趣味性游戏,教师在学习过程中根据学生掌握发球的不同程度,设定了继续练习发球(技能)、运用呼啦圈摆图形进行强化发球练习(创新)、发球升级游戏(协作)三个层次,真正做到关注个体差异与不同需求,确保每一个学生受益。 展开更多
关键词 水平二 乒乓球 正手平击发球
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网球脚步动作与教学训练 被引量:21
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作者 许庆华 高源 张中军 《吉林体育学院学报》 1997年第2期42-43,48,共3页
对网球正反手握拍击近身、远距离球的脚步动作姿势做了阐述。并指出加强正确脚步动作的训练是现代网球运动发展和技术提高的前提。
关键词 网球 正手握拍 反手握拍 击发球 脚步动作 基本姿势 教学 训练
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WZ Sagittae Space WeathermGIobal Warming
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作者 William Sokeland 《Journal of Earth Science and Engineering》 2017年第3期154-174,共21页
The planet responds thermally to the impacts of nova WZ Sagittae debris by heating and cooling. The result in the first 19 years of the nova WZ Sagittae cycle is global warming that is hemi-spherically dependent and i... The planet responds thermally to the impacts of nova WZ Sagittae debris by heating and cooling. The result in the first 19 years of the nova WZ Sagittae cycle is global warming that is hemi-spherically dependent and is detectable in South America ice core data and Antarctica surface mass balance data. Planetary thermal data are correlated in the past by calculating the debris impact times from the super outbursts times of nova WZ Sagittae. The shape of the arctic ice cap is dependent on the 220 degree path of the debris and does not exist southward between the western extension and eastern termini of nova WZ Sagittae that define the Arctic heating path. Future global heating from nova WZ Sagittae will begin in 2020-2021. The increase of 6 to 8 magnitude unusual earthquakes in recent years is the results of nova WZ Sagittae and SN 1054 debris impact. Unusual occurrences in the biosphere indicate the starting time of impacting supernova debris streams. The Antarctic sea ice distribution in November of 2016 defines the termini of maximum particle concentration impact from supernova 1006 in the southern hemisphere. The killing heat in India of the northern hemisphere is associated with the western terminus of this supernova. Novas and supernovas times of impact correlate with plague outbreaks in the western USA marking the particles in the debris streams as the cause of the disease. 展开更多
关键词 WARMING global SUPERNOVA NOVA EXTINCTION ICE CRATER meteor.
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