Reasons: No scraping work after vibration; People walks or works on concrete before final set.

产生原因：振捣后没有用拖板、刮尺抹平；混凝土未达终凝就在上面行人和操作。

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After vibration time gets to certain value, delaying vibration time again is of no service to more compaction of sand.

振动到达一定时间后，再延长振动时间无益于砂子的进一步紧实。

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However after vibration intensity reached a limit value, melting rate, thickness of melt film and melting length would remain unchanged.

当振动强度达到某一极限值后，熔融速率、熔膜厚度和熔融段长度不再随振动参数的变化而变化。

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Sony, which manufactures the top-selling Playstation games, said it had never received any feedback or complaints about hand-arm vibration syndrome after 61 million sales world-wide of Playstations I and II.

BBC: Vibrating games health warning

Montoya said he had returned to the race track from pit row before the accident, after having the crew check out a vibration he was feeling in his car.

CNN: Fire, rain make for bizarre Daytona 500

If you'll remember, soon after its launch, owners of that tracking band began reporting issues with defective units: suddenly non-functioning vibration motors (essential for Smart Alarm) or, worse, an inability to sync data.

ENGADGET: Jawbone starts over, announces a redesigned version of its Up lifestyle-tracking wristband