Sound amplification by stimulated emission of radiation phenomenon, known as the Larsen effect, is the result of a positive feedback. In general, every oscillator consists of three main parts. These are the power source or pump, the amplifier and the positive feedback leading to the output. The corresponding parts in a SASER device are the excitation or pumping mechanism, the active (amplifying) medium, and the feedback leading to acoustic radiation. Pumping can be performed, for instance, with an alternating electric field or with some mechanical vibrations of resonators. The active medium should be a material in which sound amplification can be induced. An example of a feedback
Not a Damn Thing Changed tribute to one of the guys I grew up with who hung himself in January. He was three months older than me and we walked through life together." A music video to accompany the release of "Not a Damn Thing Changed" was first released on YouTube on 11 October 2018 at a total length of three minutes and forty-nine seconds. The video was directed by René Sascha Johannsen. Forchhammer's real-life childhood friends appear in the video, which they filmed in Copenhagen and their hometown, Christiania. Not a Damn Thing Changed "Not a Damn Thing Changed" is a song by Danish