Števílka je beseda, znak ali skupina znakov (števk, glifov), s katerimi predstavimo število. Številke »(0), 1, 2, 3, 4, 5, 6, 7, 8, 9, ...« so sodobno evropsko arabske in se razlikujejo od rimskih »I, II, III, IV, V, VI, VII, VIII, IX, ...«, predstavljajo pa ista števila, sicer v različnih številskih sestavih. Podobno lahko besede predstavljajo številke. Ista števila lahko preprosto izrazimo z besedami »ena, dva, tri, štiri, pet, šest, sedem, osem, devet, ...«. V šestnajstiškem številskem sestavu, ki je najbolj domač v računalništvu, uporabimo poleg števk še črke od »A« do »F«. Še bolj nenavadne načine za zapis števil predstavljajo Churcheva cela števila.

Glej tudi

- računanje, kardinalno število, desetiški številski sestav, ulomek, procent, matematični znak, ordinalno število, enota,
- d'nijevske številke Kategorija:Števila ja:位取り記数法

66

Stoletja: 1. stoletje pr. n. št. - 1. stoletje - 2. stoletje Desetletja: 10. 20. 30. 40. 50. - 60. - 70. 80. 90. 100. 110. Leta: 61 62 63 64 65 - 66 - 67 68 69 70 71 ---- Dogodki:
- 1. januar Rojstva:
- Smrti:
- Glej tudi: 0-066 ko:66년

Tilbakekopling

Tilbakekopling eller feedback brukes i kybernetikk og kontrollteori om prosesser der en del av utsignalet fra et system føres tilbake som innsignal i det samme systemet. Uttrykket brukes om mekanismer innafor komplekse systemer i en lang rekke fag, bl.a. elektronikk, arkitektur, økonomi og biologi.

Generelt

Tilbakekopling kan være negativ, dvs. at den reduserer utsignalet, eller positiv, ved at den forsterker utsignalet.

Tilbakekopling i elektronikk

Tilbakekopling i mekaniske systemer

Tilbakekopling i økonomi

Tilbakekopling i biologi

Tilbakekopling i meteorologi og klimatologi

I meteorologi og klimaforskning studeres en rekke tilbakekoplingsmekanismer som regulerer og eventuelt endrer vær og klima. Tilbakekoblinger er hovedkilden til usikkerheten i dagens klimamodeller. Hvis global oppvarming fører til at snø- og isdekket på jorda minker, vil jordas albedo gå ned, og en større andel av solinnstrålinga absorberes. Det vil gi en positiv tilbakekopling som setter ytterligere fart i oppvarminga. Hvis global oppvarming fører til mer fordampning og dermed mer skyer, vil en større del av solinnstrålinga reflekteres i atmosfæren og ikke nå bakken. Det vil gi en negativ tilbakekopling som bremser ytterligere oppvarming. Kategori:Kybernetikk ja:フィードバック

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