🛑 معادله برنولی یا اصل برنولی در مکانیک سیالات رفتار شاره را در جریان یکنواخت توضیح می‌دهد و فرم ریاضی قانون بقای انرژی در سیالات است. به زبان ساده چنین است: در شاره‌ای که جریان دارد، افزایش سرعت جریان با کاهش فشار هم‌زمان است، به شرطی که ارتفاع سیال ثابت بماند. معادله برنولی بیان دقیق‌تر این اصل است، به عبارت دیگر اگر سرعت یک سیال افزایش پیدا کند، فشاری که بر یک سطح وارد می‌کند کاهش می‌یابد و بالعکس.
⭕ نام این اصل از نام ریاضی‌دان سوئیسی دانیل برنولی گرفته شده، اگر چه پیش از او لئونارد اویلر نیز آن را می‌دانستند.
🛑 معادله برنولی یا اصل برنولی در مکانیک سیالات رفتار شاره را در جریان یکنواخت توضیح می‌دهد و فرم ریاضی قانون بقای انرژی در سیالات است. به زبان ساده چنین است: در شاره‌ای که جریان دارد، افزایش سرعت جریان با کاهش فشار هم‌زمان است، به شرطی که ارتفاع سیال ثابت بماند. معادله برنولی بیان دقیق‌تر این اصل است، به عبارت دیگر اگر سرعت یک سیال افزایش پیدا کند، فشاری که بر یک سطح وارد می‌کند کاهش می‌یابد و بالعکس.
⭕ نام این اصل از نام ریاضی‌دان سوئیسی دانیل برنولی گرفته شده، اگر چه پیش از او لئونارد اویلر نیز آن را می‌دانستند.
The next bit isn’t clear, but Durov reportedly claimed that his resignation, dated March 21st, was an April Fools’ prank. TechCrunch implies that it was a matter of principle, but it’s hard to be clear on the wheres, whos and whys. Similarly, on April 17th, the Moscow Times quoted Durov as saying that he quit the company after being pressured to reveal account details about Ukrainians protesting the then-president Viktor Yanukovych. One thing that Telegram now offers to all users is the ability to “disappear” messages or set remote deletion deadlines. That enables users to have much more control over how long people can access what you’re sending them. Given that Russian law enforcement officials are reportedly (via Insider) stopping people in the street and demanding to read their text messages, this could be vital to protect individuals from reprisals. It is unclear who runs the account, although Russia's official Ministry of Foreign Affairs Twitter account promoted the Telegram channel on Saturday and claimed it was operated by "a group of experts & journalists." On February 27th, Durov posted that Channels were becoming a source of unverified information and that the company lacks the ability to check on their veracity. He urged users to be mistrustful of the things shared on Channels, and initially threatened to block the feature in the countries involved for the length of the war, saying that he didn’t want Telegram to be used to aggravate conflict or incite ethnic hatred. He did, however, walk back this plan when it became clear that they had also become a vital communications tool for Ukrainian officials and citizens to help coordinate their resistance and evacuations. Additionally, investors are often instructed to deposit monies into personal bank accounts of individuals who claim to represent a legitimate entity, and/or into an unrelated corporate account. To lend credence and to lure unsuspecting victims, perpetrators usually claim that their entity and/or the investment schemes are approved by financial authorities.
from pl
