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“负螺旋”态势下日本广播的应对策略
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作者 张彩 《中国广播电视学刊》 CSSCI 北大核心 2015年第1期83-85,共3页
近年来,日本广播的广告收入及收听率都在持续下降,日本广播面临着如何走出广播衰退的"负螺旋"怪圈。2013年日本商业广播联盟委员会提出了"广播再价值化工程",旨在着眼"新媒体、年轻人",向日本社会广泛诉... 近年来,日本广播的广告收入及收听率都在持续下降,日本广播面临着如何走出广播衰退的"负螺旋"怪圈。2013年日本商业广播联盟委员会提出了"广播再价值化工程",旨在着眼"新媒体、年轻人",向日本社会广泛诉求并深入开发广播的媒介价值。日本作为灾害多发国度,灾害广播成为民众防灾、救灾的生命线媒介。东日本大地震发生后,一批临时灾害电台迅速成立,在防灾救灾中起到了不可估量的重要作用。本文针对日本灾害发生的特定背景,重提了一个重要命题——新媒体支持下的社区广播和临时性灾害广播。 展开更多
关键词 日本广播 “负螺旋” “广播再价值化工程” 临时灾害广播
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Investigation of a Design Modification for Double Helical Gears Reducing Vibration and Noise 被引量:6
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作者 王成 方宗德 贾海涛 《Journal of Marine Science and Application》 2010年第1期81-86,共6页
To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge,... To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge, substituting three segment parabolas for the line. The influence of longitudinal tooth modifications on tooth surface load distributions was discussed. Transmission error minimization and uniformity of tooth surface load distribution were chosen as optimization goals and the modified parameters were obtained by applying the complex method. Finally, an experiment comparing the loaded transmission error, vibration, and noise both before and after modifications was carried out. The results indicate that the modified design is reliable. 展开更多
关键词 tooth profile modification tooth longitudinal modification double helical gears loaded transmission error
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