After the epidemic, the US economy may be worse than the 2008 financial crisis. Can some industries such as lightweight foam concrete survive?

After the epidemic, the US economy may be worse than the 2008 financial crisis. Can some industries such as lightweight foam concrete survive? The new coronavirus spread rapidly throughout the United States within a few weeks. On the 17th l…

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Apple's next big product, after the iPhone, could come out in 2022

Get ready, because its getting ready to leave Cupertino (again). If the rumors are to be believed, next year will be a busy one for Apple, with new technology likely to rival such important moments as the launch of the first Macintosh comput…

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A new low-cost sodium-ion battery is introduced. After 1000 cycles, the attenuation is less than 20%

At present, most electric vehicles use lithium-ion batteries as energy storage devices, but because lithium-ion batteries contain rare metals such as cobalt, which also makes battery manufacturing costs high, and indirectly drives the price…

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WhatsApp will hide your "last seen" status from strangers by default

WhatsApp has launched a new privacy measure that hides your last seen status with people you dont know or have never talked to in the app (via WABetaInfo). Previously, WhatsApp set the feature to everyone by default, allowing anyone on Whats…

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Overview of Aluminum Nitride AlN

Aluminum Nitride AlN is an atomic crystal, a diamond-like nitride, which can be stabilized up to 2200°C. The room temperature strength is high, and the strength decreases slowly with the increase of temperature. It has good thermal conducti…

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