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Around 2015 and 2017, some manufacturers [97] [98] [99] (namely Samsung and LG Electronics) offered washers and dryers that either have a top-loading washer and dryer built on top of a front-loading washer and dryer respectively (in Samsung washers and dryers) or offer users an optional top-loading washer that can be installed under a washer or ...
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz , i.e., 100/120 Hz, depending on the local power-line frequency .
Individuals with exploding head syndrome hear or experience loud imagined noises as they are falling asleep or are waking up, have a strong, often frightened emotional reaction to the sound, and do not report significant pain; around 10% of people also experience visual disturbances like perceiving visual static, lightning, or flashes of light.
Ultrasonic cleaners can produce irritating, high-frequency noise and hearing protection may be needed in case of continuous exposure. It is recommended to avoid using flammable cleaning solutions because ultrasonic cleaners increase the temperature even when not equipped with a heater.
The Macintosh II is the first to use the death chimes, using the Apple Sound Chip to play a loud and eerie upward major arpeggio, with different chimes on many models. The Macintosh Quadra , Centris , Performa , LC , and the Macintosh Classic II play a generally softer and lower pitched version of the upward major arpeggio, followed by three or ...
Natalie Cole's version of "Now We're Starting Over Again" (simply titled as "Starting Over Again") was released in late 1989 in the UK and early 1990 in the U.S., being the fifth of five singles released from her 1989 album Good to Be Back, the first of which, "Miss You Like Crazy" (#7 on the Hot 100 / #1 R&B), also a Michael Masser production and co-write, becoming Cole's second major hit ...
Since temperature (and thus the speed of sound) decreases with increasing altitude up to 11 km, sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source. [9] The decrease of the speed of sound with height is referred to as a negative sound speed gradient.
[10] [11] A cycle of compressor surge can be divided into several phases. [12] If the throttle valve is turned to be a very small opening, the gas reservoir would have a positive net flux. The pressure in the reservoir keeps increasing and then exceeds the pressure at compressor exit, thus resulting in an adverse pressure gradient in exit ducts.