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[edit] Summary
Description |
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
The photo has been realized using the photoelasticity method, an experimental method which gets a fairly accurate picture of stress distribution even around abrupt discontinuities in a material.
When a ray of plane polarised light is passed through a photoelastic material, it gets resolved along the two principal stress directions and each of these components experiences different refractive indices. The difference in the refractive indices leads to a relative phase retardation between the two component waves.
The setup used to photograph this photo was probably composed of:
- A regular light source, with a quarter-wave plate installed to polarize the emerging light
- A regular photo camera, with a quarter-wave plate installed in front of the lens
Light and camera being installed and oriented in the same direction, the two
quarter-wave plates were turned with the polarizing axis in the same direction.
Français : Couteaux, fourchettes et cuillères biodégradables en polyester à base d'amidon.
Português: Facas, garfos e colheres fabricadas com um material poliéster biodegradável à base de amido. A foto foi tirada usando o método fotoelástico, um método experimental que fornece uma imagem bastante precisa da distribuição do stress mesmo que o material possua descontinuidades abruptas.
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Source |
United States Department of Agriculture (link)
noise removed with a Gaussian blur in The GIMP
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Date |
unknown
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Author |
Scott Bauer
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Permission
(Reusing this image) |
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[edit] Awards
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This image was selected as a picture of the day for April 06, 2007. It was captioned as followed:
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
Česky: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
Suomi: Luonnossa hajoavasta materiaalista valmistettuja veitsiä, haarukoita ja lusikoita
Magyar: Evőeszközök biológiailag lebomló poliészterből
Nederlands: Messen, vorken en lepels gemaakt van een organisch zetmeel-polyestermateriaal. Foto gemaakt met de foto-elasticimetriemethode.
Русский: Ножи, вилки и ложки, изготовленные из разлагаемого микроорганизмами полиэстера на основе крахмала.
Slovenčina: Jedálne príbory vyrobené z polymérnych biodegradabilných materiálov
Svenska: Biologiskt nedbrytbara knivar, gafflar och skedar kan tillverkas av stärkelse-polyester-material.
中文(简体): 应用显示内部应力分布的弹性光学方法拍摄的,用可降解的淀粉塑料制造的 餐刀, 叉子 和 匙。
中文(繁體): 以生物可分解的澱粉聚酯物料製成的 餐刀、 餐叉和 匙
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Historia pliku
Kliknij na datę/czas, aby zobaczyć, jak plik wyglądał w tym czasie.
| Data/czas | Wymiary | Użytkownik | Opis |
aktualny | 23:51, 22 kwi 2007 | 2 700×1 757 (559 kB) | 17Drew | |
| 20:14, 14 lut 2007 | 2 700×1 757 (1,96 MB) | 17Drew | |
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