Search results
Results from the WOW.Com Content Network
An aspirating smoke detector (ASD) is a system used in active fire protection, consisting of a central detection unit which draws air through a network of pipes to detect smoke. [1] The sampling chamber is based on a nephelometer that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber.
The majority of audible notification appliances installed prior to 1996 produced a steady sound for evacuation. In general, no common standard at that time mandated any particular tone, or pattern for audible fire alarm evacuation signals. While less common than a steady sound, differing signaling methods were used for the same purpose.
As well as functioning as electronic sounders, S-Cubed devices can feature a voice function and a beacon function, which would later be replaced in 2014 with an EN54 compliant VAD with the release of the Mark 3 sounders. In 2005, the S-Quad was released, [9] featuring a beacon, sounder, detector and voice sounder. Early models did not feature ...
It was reported that shortly after the events of September 11, 2001, the sound of many activated PASS devices could be heard beneath the rubble of the collapsed World Trade Center. [ 2 ] 343 firefighters (including a chaplain and two paramedics) of the New York City Fire Department (FDNY) were killed on that day.
Active noise cancelling (ANC) is a software process that uses existing in-vehicle infotainment hardware to eliminate undesirable noise within the interior of a vehicle. This elimination technique is known as harmonic order reduction, where unwanted audio signals are identified by sensors and filtered out of the overall interior vehicle sound. [3]
An off-label prescription drug has been shown to help children with autism gain the ability to speak. Leucovorin is used for cancer patients, but doctors are pushing for its approval for autism.
As a ‘smart’ alarm clock it has a 2.4 GHz WiFi connectivity for firmware and content download. Unlike traditional alarm clocks, Alarmo uses a 24 GHz mmWave presence sensor [5] to detect motion during sleep and waking up. [3] The longer the user stays in bed without moving, the louder and more intense the sound of the alarm will become.
For gas appliances, a flame supervision device (FSD) – alternative name: flame failure device (FFD) – is a general term for any device designed to stop flammable gas going to the burner of a gas appliance if the flame is extinguished.