科学家测量出中微子至今最精确质量上限 0.45 eV
KATRIN实验团队通过分析氚的β衰变，测量了约3600万个电子的能量，确定了电子中微子有效质量的最严格实验室上限为<0.45 eV（90%置信水平）。这一结果表明中微子的质量不到电子的百万分之一，为超越标准模型的物理学提供了重要线索。
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科学家测量出中微子至今最精确质量上限 0.45 eV Solidot
科学家测定最精确中微子质量上限 中国科技网/科学网
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Secret Chats are one of the service’s additional security features; it allows messages to be sent with client-to-client encryption. This setup means that, unlike regular messages, these secret messages can only be accessed from the device’s that initiated and accepted the chat. Additionally, Telegram notes that secret chats leave no trace on the company’s services and offer a self-destruct timer.
The super secure UAE-based Telegram messenger service, developed by Russian-born software icon Pavel Durov, is looking to raise $1bn through a bond placement to a limited number of investors from Russia, Europe, Asia and the Middle East, the Kommersant daily reported citing unnamed sources on February 18, 2021.The issue reportedly comprises exchange bonds that could be converted into equity in the messaging service that is currently 100% owned by Durov and his brother Nikolai.Kommersant reports that the price of the conversion would be at a 10% discount to a potential IPO should it happen within five years.The minimum bond placement is said to be set at $50mn, but could be lowered to $10mn. Five-year bonds could carry an annual coupon of 7-8%.
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