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Optical wireless communication (OWC) refers to transmission in unguided propagation media through the use of optical carriers: visible, infrared (IR), and ultraviolet (UV) radiation. Signalling through beacon fires, smoke, ship flags and semaphore telegraph can be considered the historical forms of OWC. [3]
A rhinoceros (/ r aɪ ˈ n ɒ s ər ə s /; from Ancient Greek ῥινόκερως (rhinókerōs) 'nose-horned'; from ῥίς (rhis) 'nose', and κέρας (kéras) 'horn'; pl.: rhinoceros or rhinoceroses), commonly abbreviated to rhino, is a member of any of the five extant species (or numerous extinct species) of odd-toed ungulates in the family Rhinocerotidae; it can also refer to a member ...
Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...
Juneteenth is a federal holiday in the United States. For decades, activists and congress members (led by many African Americans) proposed legislation, advocated for, and built support for state and national observances. During his campaign for president in June 2020, Joe Biden publicly celebrated the holiday. [122]
Raycom Sports is a Charlotte, North Carolina –based producer of sports television programs owned by Gray Television . It was founded in 1979 by husband and wife, Rick and Dee Ray. In the 1980s, Raycom Sports established a prominent joint venture with Jefferson-Pilot Communications which made them partners on the main Atlantic Coast Conference ...
Ryan Rodney Reynolds OBC (born October 23, 1976) is a Canadian and American actor, producer, and businessman. He began his career starring in the Canadian teen soap opera Hillside (1991–1993) and had minor roles before landing the lead role on the sitcom Two Guys and a Girl between 1998 and 2001. Reynolds then starred in a range of films ...
Philosophy ( φιλοσοφία, 'love of wisdom', in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions. Historically, many of the individual sciences ...
42°29′ N to 45°56′ N. Longitude. 96°26′ W to 104°03′ W. Website. sd .gov. South Dakota ( / dəˈkoʊtə / ⓘ də-KOH-tə; [8] Sioux: Dakȟóta itókaga, pronounced [daˈkˣota iˈtokaga]) is a landlocked state in the North Central region of the United States. It is also part of the Great Plains.