perceived noise level
91Critical bands — The term critical band, introduced by Harvey Fletcher in the 1940s, referred to the frequency bandwidth of the then loosely defined auditory filter. Since Georg von Békésy’s studies (1960), the term also refers literally to the specific area on… …
92Suppressor — Several firearms with detachable suppressors, from top to bottom: An Uzi, An AR 15 variant, A Heckler Koch USP Tactical, A Beretta 92FS, and a SIG Mosquito …
93Air transport and the environment (United Kingdom) — Increasing demand for air travel in the UK has resulted in a conflict between the desire to cater for that demand and the environmental consequences of doing so. In the past 25 years the UK air transport industry has seen sustained growth, and… …
94Cortisol awakening response — Production of the corticosteroid hormone cortisol is increased after a person awakes in the morning The cortisol awakening response (CAR) is an increase of about 50% in cortisol levels occurring 20–30 minutes after awakening in the morning… …
95Urban planning — Housing and Urban Development redirects here. For the Cabinet department of the United States government, see United States Department of Housing and Urban Development. Urban planning designs settlements, from the smallest towns to the largest… …
96Mixing console — In professional audio, a mixing console, or audio mixer, also called a sound board, mixing desk, or mixer is an electronic device for combining (also called mixing ), routing, and changing the level, timbre and/or dynamics of audio signals. A… …
97cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …
98Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …
99NIMBY — An airport is a typical example of a development that can cause a NIMBY reaction: developers may claim economic benefits for the city, while locals may benefit from improved transport links and new jobs but they may oppose it with objections to… …
100Motion simulator — Simulator seating St. Louis Zoo A motion simulator or motion platform is a mechanism that encapsulates occupants and creates the effect/feelings of being in a moving vehicle. Motion simulators fall into two categories (described below) based on… …
