File:BiodegradablePlasticUtensils1.jpg
![File:BiodegradablePlasticUtensils1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/BiodegradablePlasticUtensils1.jpg/800px-BiodegradablePlasticUtensils1.jpg?20070422215145)
原始檔案 (2,700 × 1,757 像素,檔案大小:559 KB,MIME 類型:image/jpeg)
說明
說明
摘要
[編輯]描述BiodegradablePlasticUtensils1.jpg |
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:
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.
Tiếng Việt: Dao, nĩa, muỗng được làm từ một loại vật liệu bột sợi tổng hợp có khả năng phân huỷ sinh học. |
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日期 |
日期不明 Unknown date |
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來源 |
United States Department of Agriculture (link)
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作者 | Scott Bauer | ||||
授權許可 (重用此檔案) |
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評價
[編輯]
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This image was selected as picture of the day on Wikimedia Commons for 6 April 2007. It was captioned as follows: Other languages:
Čeština: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů Magyar: Evőeszközök biológiailag lebomló poliészterből Nederlands: Messen, vorken en lepels gemaakt van een organisch zetmeel-polyestermateriaal. Foto gemaakt met de foto-elasticimetriemethode. Slovenčina: Jedálne príbory vyrobené z polymérnych biodegradabilných materiálov Suomi: Luonnossa hajoavasta materiaalista valmistettuja veitsiä, haarukoita ja lusikoita Svenska: Biologiskt nedbrytbara knivar, gafflar och skedar kan tillverkas av stärkelse-polyester-material. |
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This image was selected as picture of the day on Vietnamese Wikipedia.
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日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
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目前 | 2007年4月22日 (日) 21:51 | ![]() | 2,700 × 1,757(559 KB) | 17Drew~commonswiki(對話 | 貢獻) | darkened background |
2007年2月14日 (三) 18:14 | ![]() | 2,700 × 1,757(1.96 MB) | 17Drew~commonswiki(對話 | 貢獻) | {{Information |Description=knives, forks, and spoons made from a biodegradable starch-polyester material |Source=United States Department of Agriculture ([http://www.ars.usda.gov/is/graphics/photos/k7245-1.htm link])<br>noise removed with a Gaussian blur |
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