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‏وقتی هلیکوپترها در صحرا پرواز می‌کنند، پره‌هایشان براثر برخورد و اصطکاک با ذرات ریز ماسه معلق در هوا جرقه می‌زنند. این پدیده باعث فرسایشِ لبه‌های ملخ‌ها می‌شود.
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‏وقتی هلیکوپترها در صحرا پرواز می‌کنند، پره‌هایشان براثر برخورد و اصطکاک با ذرات ریز ماسه معلق در هوا جرقه می‌زنند. این پدیده باعث فرسایشِ لبه‌های ملخ‌ها می‌شود.
🚁@NIT_Aerospace

BY انجمن علمی مهندسی هوافضا






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Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. Channels are not fully encrypted, end-to-end. All communications on a Telegram channel can be seen by anyone on the channel and are also visible to Telegram. Telegram may be asked by a government to hand over the communications from a channel. Telegram has a history of standing up to Russian government requests for data, but how comfortable you are relying on that history to predict future behavior is up to you. Because Telegram has this data, it may also be stolen by hackers or leaked by an internal employee. At its heart, Telegram is little more than a messaging app like WhatsApp or Signal. But it also offers open channels that enable a single user, or a group of users, to communicate with large numbers in a method similar to a Twitter account. This has proven to be both a blessing and a curse for Telegram and its users, since these channels can be used for both good and ill. Right now, as Wired reports, the app is a key way for Ukrainians to receive updates from the government during the invasion. Pavel Durov, a billionaire who embraces an all-black wardrobe and is often compared to the character Neo from "the Matrix," funds Telegram through his personal wealth and debt financing. And despite being one of the world's most popular tech companies, Telegram reportedly has only about 30 employees who defer to Durov for most major decisions about the platform. 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.
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