Isotropi: Perbedaan antara revisi
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JohnThorne (bicara | kontrib) ←Membuat halaman berisi ''''Isotropi''' adalah keseragaman atau uniformitas dalam segala arah. Diturunkan dari kata Yunani ''isos'' (ίσος, "sama, setara") dan ''tropos''...' |
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==Matematika==
; [[:en:Isotropic manifold|''isotropic manifold'']]
; [[Isotropic quadratic form]]: A [[quadratic form]] ''q'' is said to be isotropic if there is a non-zero vector ''v'' such that {{nowrap|1=''q''(''v'') = 0}}.
; [[Isotropic coordinates]] on an isotropic chart for [[Lorentzian manifolds]].
; [[Isotropy group]]: An isotropy group is the group of [[isomorphism]]s from any [[object (category theory)|object]] to itself in a [[groupoid]].<ref>A [[groupoid]] <math>\mathcal G</math> is a [[category (mathematics)|category]] where all [[morphism]]s are [[isomorphism]]s, i.e., invertible. If <math>G \in \mathcal G</math> is any object, then <math>\mathcal G(G,G)</math> denotes its [[isotropy group]]: the group of isomorphisms from <math>G</math> to <math>G</math>.</ref>
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; [[Fluid dynamics]]: Fluid flow is isotropic if there is no directional preference (e.g. in fully developed 3D turbulence). An example of anisotropy is in flows with a background density as gravity works in only one direction. The apparent surface separating two differing isotropic fluids would be referred to as an isotrope.
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; [[Ekspansi termal]]: suatu benda padat dikatakan isotropik jika ekspasi suatu benda padat itu sama ke segala arah ketika energi termal diberikan kepada benda padat itu.
; [[:en:Electromagnetism|Elektromagnetika]]: Suatu medium isotropik adalah sedemikian sehingga permitivitas (''permittivity''), ε, dan permeabilitas, μ, dari medium itu uniform ke segala arah dalam medium itu. Contoh paling sederhana adalah "ruang bebas" (''free space'').
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▲; [[Optics]]: Optical isotropy means having the same optical properties in all directions. The individual [[reflectance]] or [[transmittance]] of the domains is averaged if the macroscopic reflectance or transmittance is to be calculated. This can be verified simply by investigating, e.g., a [[polycrystalline]] material under a polarizing microscope having the polarizers crossed: If the crystallites are larger than the resolution limit, they will be visible.
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===Materials science===
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Isotropic materials are useful since they are easier to shape, and their behavior is easier to predict. Anisotropic materials can be tailored to the forces an object is expected to experience. For example, the fibers in [[carbon fiber]] materials and [[rebar]]s in [[reinforced concrete]] are oriented to withstand tension.
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In industrial processes, such as etching steps, isotropic means that the process proceeds at the same rate, regardless of direction. Simple chemical reaction and removal of a substrate by an acid, a solvent or a reactive gas is often very close to isotropic. Conversely, anisotropic means that the attack rate of the substrate is higher in a certain direction. Anisotropic etch processes, where vertical etch-rate is high, but lateral etch-rate is very small are essential processes in [[microfabrication]] of [[integrated circuits]] and [[Microelectromechanical systems|MEMS]] devices.
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An [[isotropic antenna]] is an idealized "[[radiator|radiating element]]" used as a [[reference]]; an [[antenna (electronics)|antenna]] that broadcasts power equally (calculated by the [[Poynting vector]]) in all directions. The gain of an arbitrary antenna is usually reported in [[decibel]]s relative to an isotropic antenna, and is expressed as dBi or dB(i).
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==Biologi==
; [[Biologi sel]]: Jika sifat-sifat suatu [[dinding sel]] kurang lebih di segala arah, maka dikatakan bersifat isotropik. Bagian interior sel dikatakan anisotropik karena adanya [[organel]] intraseluler .
; [[Fisiologi]]: Dalam sel otot skeletal (atau [[:en:muscle fibers|muscle fibers]]), istilah "[[:en:isotropic bands|isotropik]]" merujuk kepada pita-pita terang ([[:en:I bands|pita jenis I]]) yang berkontribusi menghasilkan "''striated pattern''" pada sel-sel.
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== Cabang ilmu lain ==
; ''[[Ekonomika]]'' dan ''[[Geografi]]'': suatu daerah isotropik adalah daerah yang mempunyai sifat-sifat yang sama di mana-mana. Daerah seperti itu merupakan suatu konstruksi yang dibutuhkan dalam banyak jenis model.
▲; [[Pharmacology]]: While it is well established that the skin provides an ideal site for the administration of local and systemic drugs, it presents a formidable barrier to the permeation of most substances.<ref>Landman L. “The Epidermal Permeability Barrier.” Anat Embryol (Berl) 1988; 178:1-13 [http://www.springerlink.com/content/x2v22259r84n6k75/]</ref> Most recently, [[isotropic formulations]] have been used extensively in dermatology for drug delivery.<ref>Gregoriadis G. “Lipsomes in Drug Delivery.” Harwood Academic Publishers, 1993; [http://books.google.com.au/books?hl=en&lr=&id=IqqYFne6deEC&oi=fnd&pg=PR7&dq=Liposomes+in+Drug+Delivery&ots=MSjlK_DRqc&sig=XKlC_NXQDndHXkVUepu8rIPaQrU]</ref>
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== Lihat pula ==
{{Wiktionary}}
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