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Lifestyle, Americas, Special Report

Posted: 08 Jun 2022 17:22
by rezkaesold
This use of sound has its limitations -- for example, if you try taking a picture from inside a tour bus with the windows closed, the sound waves will bounce off of the window instead of the subject and so focus the lens incorrectly. This Polaroid system is a classic active system. It is called "active" because the camera emits something (in this case, sound waves) in order to detect the distance of the subject from the camera. Infrared systems use a variety of techniques to judge the distance. For example, this patent describes a system that reflects an infrared pulse of light off the subject and looks at the intensity of the reflected light to judge the distance. Infrared is active because the autofocus system is always sending out invisible infrared light energy in pulses when in focus mode. It is not hard to imagine a system in which the camera sends out pulses of infrared light just like the Polaroid camera sends out pulses of sound.|MOSCOW -- Ukrainian and Western officials are worried that a Russian military buildup near Ukraine could signal plans by Moscow to invade its ex-Soviet neighbor. The Kremlin insists it has no such intention and has accused Ukraine and its Western backers of making the claims to cover up their own allegedly aggressive designs. It’s unclear whether the Russian troop concentration heralds an imminent attack. Russian President Vladimir Putin has pushed for Western guarantees precluding NATO's expansion to Ukraine, and the buildup could reflect an attempt to back up the message. WHAT ARE THE ROOTS OF THE RUSSIA-UKRAINE STANDOFF? Ukraine, which was part of the Russian empire for centuries before becoming a Soviet republic, won independence as the USSR broke up in 1991. The country has moved to shed its Russian imperial legacy. Forge increasingly close ties with the West. Ukraine and the West accused Russia of sending its troops and weapons to back the rebels.




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Re: Lifestyle, Americas, Special Report

Posted: 15 Mar 2023 13:47
by wangiskahn2