Image:BiodegradablePlasticUtensils1.jpg

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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.
Source

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

unknown
Author

Scott Bauer
Permission
(Reusing this image)
Public domain This image is a work of a United States Department of Agriculture employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.

Original

Cropped


[edit] Awards

POTY
Featured picture
 This file was a candidate on Picture of the Year 2007.
This is a featured picture on Wikimedia Commons: it is considered one of our finest images.
If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.		 Wikimedia Commons
Picture of the day 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.
Беларуская: Сталовыя прыборы, вырабленыя з біяраскладальнага крухмал-палістыролу.
Česky: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů
Deutsch: Besteck aus biologisch abbaubarem Stärke-Polyester.
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
Esperanto: Forkoj, tranĉiloj kaj kuleroj produktitaj el biodegradiĝema materialo.
Español: Cuchillos, tenedores y cucharas realizados a partir de material biodegradable.
Suomi: Luonnossa hajoavasta materiaalista valmistettuja veitsiä, haarukoita ja lusikoita
Français : Fourchettes, couteaux et cuillères biodégradables, en polyester à base d'amidon.
Magyar: Evőeszközök biológiailag lebomló poliészterből
Italiano: Forchette, coltelli e cucchiai realizzati a partire da materiale biodegradabile.
日本語: 生分解性プラスチック(デンプン基ポリエステル系)製のスプーン、フォーク、ナイフ。
Nederlands: Messen, vorken en lepels gemaakt van een organisch zetmeel-polyestermateriaal. Foto gemaakt met de foto-elasticimetriemethode.
Polski: Noże, łyżki i widelce wykonane z materiałów biodegradowalnych.
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

Historique du fichier

Cliquer sur une date et une heure pour voir le fichier tel qu’il était à ce moment-là

Date et heureDimensionsUtilisateurCommentaire
actuel22 avril 2007 à 23:512 700×1 757 (559 Kio)17Drew (darkened background)
14 février 2007 à 20:142 700×1 757 (1,96 Mio)17Drew ({{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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