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Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
The Pittsburgh and Ohio Central Railroad ( reporting mark POHC) is a short-line railroad operating 35 miles (56 km) of track over the Chartiers Branch in southwest Pennsylvania. It also operated a small portion of the former Conrail Panhandle Route between Carnegie and Walkers Mill. This portion has not seen a train since 2014, and both bridges ...
Designated NHL. October 9, 1960 [ 3] Point State Park (locally known as The Point) is a Pennsylvania state park which is located on 36 acres (150,000 m 2) in Downtown Pittsburgh, Allegheny County, Pennsylvania, USA, at the confluence of the Allegheny and Monongahela rivers, forming the Ohio River . Built on land that was acquired via eminent ...
The creeks around East Palestine, Ohio, were so badly contaminated by last year's disastrous Norfolk Southern derailment that some workers became sick during the cleanup. Workers who reported ...
Historians have noted the connection of this event to a longer history of industrial pollution crises in the Ohio River valley, notably the nearby Donora Smog of 1948. [198] Similarities between the derailment and the plot of the 2022 film White Noise [199] have been noted. The film features a cataclysmic train accident that creates a plume of ...
July 19, 2024 at 4:29 AM. The shooting at the Trump rally in Butler on 13 July left residents seething with anger at perceived security failing and worried for the town's reputation [Getty Images ...
Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...
Hatch Restore 2. The Hatch Restore 2 is a cross between a sunrise alarm clock and a sound machine that enables you to play consistent white noise. Sunrise alarm clocks gradually emit light to ...