File:BiodegradablePlasticUtensils1.jpg

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原始檔案(2,700 × 1,757 像素,檔案大小:559 KB,MIME 類型:image/jpeg


摘要

描述
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.
Tiếng Việt: Dao, nĩa, muỗng được làm từ một loại vật liệu bột sợi tổng hợp có khả năng phân huỷ sinh học.
日期 日期不明
Unknown date
來源

United States Department of Agriculture (link)
noise removed with a Gaussian blur in The GIMP

This image was released by the Agricultural Research Service, the research agency of the United States Department of Agriculture, with the ID k7245-1 (next).

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.


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作者 Scott Bauer
授權許可
(重用此檔案)
Public domain
本圖像是美國農業部人員的職務作品。作為美國聯邦政府的作品,本圖像屬於公有領域

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說明

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Knives, forks, and spoons made from a biodegradable starch-polyester material.

在此檔案描寫的項目

描繪內容

西方餐具 繁體中文 (已轉換拼寫)

共享資源質素評價 繁體中文 (已轉換拼寫)

維基共享資源特色圖片 中文 (已轉換拼寫)

image/jpeg

c0d5eaf9ea4bacc5e6cbcf72cf44a71b96a9f3d4

斷定方法:​SHA-1 中文 (已轉換拼寫)

572,440 位元組

1,757 像素

2,700 像素

檔案歷史

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日期/時間縮⁠圖尺寸使用者備⁠註
目前2007年4月22日 (日) 21:51於 2007年4月22日 (日) 21:51 版本的縮圖2,700 × 1,757(559 KB)17Drew~commonswikidarkened background
2007年2月14日 (三) 18:14於 2007年2月14日 (三) 18:14 版本的縮圖2,700 × 1,757(1.96 MB)17Drew~commonswiki{{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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