polarity mark
41Sun — This article is about the star. For other uses, see Sun (disambiguation). The Sun …
42Magnetic field — This article is about a scientific description of the magnetic influence of an electric current or magnetic material. For the physics of magnetic materials, see magnetism. For information about objects that create magnetic fields, see magnet. For …
43Triboelectric effect — Triboelectric series: Most positively charged + Air Human skin Leather Rabbit s fur Glass Quartz Mica Human hair …
44DMX512-A — is an EIA 485 based communications protocol that is most commonly used to control stage lighting and effects.Developed by the Engineering Commission of USITT, the standard started in 1986, with subsequent revisions in 1990 leading to USITT… …
45Film preservation — Stacked containers filled with reels of film stock. The film preservation, or film restoration, movement is an ongoing project among film historians, archivists, museums, cinematheques, and non profit organizations to rescue decaying film stock… …
46Bipolar violation — A Bipolar Violation, Bipolarity Violation , or BPV , is an error in the transmission of a T1 signal where two pulses of the same polarity occur without an intervening pulse of the opposite polarity.T1 signals are transmitted using a scheme called …
47William Walker Atkinson — (December 5, 1862 November 22, 1932) was an attorney, merchant, publisher, and author, as well as an occultist and an American pioneer of New Thought movement. He is also known to have been the author of the pseudonymous works attributed to… …
48Niger-Congo languages — Family of some 1,400 languages of Africa. All of these are considered to be distinct languages and not simply dialects. The named dialects of these languages number many thousands more, not to mention the variant names for those languages and… …
49Portable appliance testing — For other uses, see PAT (disambiguation). A common label for certifying that a device has been tested. Portable appliance testing (commonly known as PAT or PAT Inspection or PAT Testing) is a process in the United Kingdom, New Zealand and… …
50Evidentiality — Grammatical categories Animacy Aspect Case Clusivity Definiteness Degree of comparison Evidentiality …
