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- 1417507
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- 2019-8-29
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- 1970-1-1
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- 阅读1 Why is Texas experiencing a winter freeze?
- 阅读时间 2min58s 整理时间 11min56s 合计 14min54s
- structure
- 2. 德州寒冬是由于北极 “sudden stratospheric warming”造成的
- 3. 尽管有的科学家认为是气候变暖导致极地涡旋减弱,从而使冷空气南下,但是极地涡旋和气候变暖之间并没有明显的相关性
- vocabulary
- cold snaps 寒流
- Some scientists are keen to link such cold snaps to climate change, arguing that warming temperatures in the Arctic’s troposphere (the lower atmospheric level which begins at the surface) are weakening the polar vortex and allowing bitter air to escape from the north more often.
- frigid 寒冷的
- climate change is making cold snaps in mid-latitude regions rarer and less frigid than they once were, regardless of their cause.
- Power outages 断电
- Power outages, caused by a combination of high demand, power plants crippled by the weather and a grid that is cut off from the rest of the country, have left millions of people shivering in the dark.
- corralled 赶入围栏
- Known as “sudden stratospheric warming”, it causes the polar vortex—a ring of cold air that encircles the poles—to weaken, lessening the forces that keep cold air corralled at high latitudes.
- 阅读2 Rapid Eye Movement
- 阅读时间 2min27s 整理时间 11min02s 合计 13min39s
- structure
- 1. 传统观点:REM睡眠和slow-wave睡眠有很大的不同
- EEG脑电波研究表明
- REM睡眠类似清醒状态,高频,振幅低;slow-wave低频,振幅高
- 在大脑的一些subunits中,REM睡眠和清醒状态都表现出类似的脑部活动;和slow-wave时不同
- REM睡眠时脑部温度升高,升高到和清醒状态时差不多;slow-wave时温度低
- 2. 新发现:REM睡眠和slow-wave睡眠有一些相似点
- PGO spikes在REM睡眠和slow-wave睡眠的过程中都会产生
- 3. 需要重新对清醒状态的EMPs进行评估
- PGO spikes和EMPs都是在REM睡眠,slow-wave睡眠和清醒状态都能产生的
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