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It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor. The sensor will detect pre ignition and retard the engines timing to protect the engine from damage. Undesired engine behavior will occur such as loss of performance or power.
A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.
The number of no-knock raids has increased from 3,000 in 1981 to more than 50,000 in 2005, according to Peter Kraska, a criminologist at Eastern Kentucky University in Richmond. [19] In 2010, Kraska estimated 60,000–70,000 no-knock or quick-knock raids were conducted by local police annually, the majority of which were looking for marijuana. [1]
Depending on the type, it can be sensitive to different frequencies or levels of noise or vibration. The system is based on coaxial or electro-magnetic sensor cable with the controller having the ability to differentiate between signals from the cable or chain-wire being cut, an intruder climbing the fence, or bad weather conditions.
Locally issued and owner-provided license plates were phased out by 1909 for automobiles, [12] but local plates continued to be used for motorcycles until 1914. [2] One effect of the Ward Law was to eliminate a significant revenue stream for cities like Cincinnati, which took in about $5,000 a year (equivalent to $170,000 today) from auto ...
Hudson v. Michigan, 547 U.S. 586 (2006), is a United States Supreme Court case in which the Court held that a violation of the Fourth Amendment requirement that police officers knock, announce their presence, and wait a reasonable amount of time before entering a private residence (the knock-and-announce requirement) does not require suppression of the evidence obtained in the ensuing search.
A number of stories exist to explain the community's unusual name. [1] One claims that a tremendous brawl broke out when the community was in its infancy. More humorous is the tale of a woman who confronted her preacher during a Sunday morning worship service, informing the clergyman that her husband was cheating on her.
Roof knocking (Hebrew: הקש בגג) [1] or "knock on the roof" [2] is a term used by the Israel Defense Forces (IDF) to describe its practice of dropping non-explosive or low-yield devices on the roofs of targeted civilian homes [3] in the occupied Palestinian territories as a prior warning of imminent bombing attacks to give the inhabitants time to flee the attack.