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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
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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
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For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. "There is a significant risk of insider threat or hacking of Telegram systems that could expose all of these chats to the Russian government," said Eva Galperin with the Electronic Frontier Foundation, which has called for Telegram to improve its privacy practices. A Russian Telegram channel with over 700,000 followers is spreading disinformation about Russia's invasion of Ukraine under the guise of providing "objective information" and fact-checking fake news. Its influence extends beyond the platform, with major Russian publications, government officials, and journalists citing the page's posts. As such, the SC would like to remind investors to always exercise caution when evaluating investment opportunities, especially those promising unrealistically high returns with little or no risk. Investors should also never deposit money into someone’s personal bank account if instructed. Overall, extreme levels of fear in the market seems to have morphed into something more resembling concern. For example, the Cboe Volatility Index fell from its 2022 peak of 36, which it hit Monday, to around 30 on Friday, a sign of easing tensions. Meanwhile, while the price of WTI crude oil slipped from Sunday’s multiyear high $130 of barrel to $109 a pop. Markets have been expecting heavy restrictions on Russian oil, some of which the U.S. has already imposed, and that would reduce the global supply and bring about even more burdensome inflation.
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