Учёные добились оптического контроля фазовых и групповых скоростей в обычных жидкостях Фазовая и групповая скорость света, распространяющегося в обычных оптических средах, не может превышать скорость света в вакууме. Однако в так называемых материалах с эпсилон-около-нуля (ENZ) свет демонстрирует бесконечную фазовую скорость и исчезающую групповую скорость для определенного цвета (частоты). До сих пор такие свойства наблюдались только у очень немногих твердых тел и https://iposs.net/component/k2/item/24315
Учёные добились оптического контроля фазовых и групповых скоростей в обычных жидкостях Фазовая и групповая скорость света, распространяющегося в обычных оптических средах, не может превышать скорость света в вакууме. Однако в так называемых материалах с эпсилон-около-нуля (ENZ) свет демонстрирует бесконечную фазовую скорость и исчезающую групповую скорость для определенного цвета (частоты). До сих пор такие свойства наблюдались только у очень немногих твердых тел и https://iposs.net/component/k2/item/24315
The regulator took order for the search and seizure operation from Judge Purushottam B Jadhav, Sebi Special Judge / Additional Sessions Judge. But Kliuchnikov, the Ukranian now in France, said he will use Signal or WhatsApp for sensitive conversations, but questions around privacy on Telegram do not give him pause when it comes to sharing information about the war. At this point, however, Durov had already been working on Telegram with his brother, and further planned a mobile-first social network with an explicit focus on anti-censorship. Later in April, he told TechCrunch that he had left Russia and had “no plans to go back,” saying that the nation was currently “incompatible with internet business at the moment.” He added later that he was looking for a country that matched his libertarian ideals to base his next startup. "Someone posing as a Ukrainian citizen just joins the chat and starts spreading misinformation, or gathers data, like the location of shelters," Tsekhanovska said, noting how false messages have urged Ukrainians to turn off their phones at a specific time of night, citing cybersafety. Right now the digital security needs of Russians and Ukrainians are very different, and they lead to very different caveats about how to mitigate the risks associated with using Telegram. For Ukrainians in Ukraine, whose physical safety is at risk because they are in a war zone, digital security is probably not their highest priority. They may value access to news and communication with their loved ones over making sure that all of their communications are encrypted in such a manner that they are indecipherable to Telegram, its employees, or governments with court orders.
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