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尼嘛的美国，这个第一你也配？ - 未名空间(mitbbs com)

尼嘛的美国，这个第一你也配？ - 未名空间(mitbbs com)
mitbbs.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from mitbbs.com Daily Mail and Mail on Sunday newspapers.

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科学告诉你出轨有哪些信号

科学告诉你出轨有哪些信号
sina.com.cn - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sina.com.cn Daily Mail and Mail on Sunday newspapers.

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地下光纤能否用来监控城市活动？

　　2020年春天，美国宾夕法尼亚州立大学的主校园区（称为“州学院”，行政级别为自治镇）因为封城而陷入寂静，但与此同时，一个临时配备的仪器正“聆听”着地下的动静。宾夕法尼亚州立大学的研究团队将该仪器接入了一条长达4公里、贯穿校园的地下电信光缆，将其变成了一种科学监控设备。　　通过向光纤发射激光，科学家可以探测到地面上的振动，这是由于振动会导致光缆发生轻微变形。当有汽车驶过，或者有人走过地下光缆上方时，地面会将这些独特的地震信号传递给光缆。因此，在没有对地面进行影像监控的情况下，科学家可以通过这种方法详细描绘出一个曾经繁华的社区是如何陷入停滞，又如何随着封锁的放松而慢慢恢复生机。　　通过对这些地震信号的分析，研究人员发现，在封锁开始后的4月份，校园里的人流量几乎减�

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惠普计划将中国打印机业务部门出售给富士康

惠普计划将中国打印机业务部门出售给富士康
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高科技应对方案助力各国战胜沙漠蝗

高科技应对方案助力各国战胜沙漠蝗
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