Рәсем:BiodegradablePlasticUtensils1.jpg

Википедия – ирекле энциклопедия

Был файл, Викимедия Фондының баҫмаларында ҡулланыласаҡ рәсемдәр һәм мультимедианың һаҡлау урыны булған Вики-Һаҡлағыста һаҡлана.

Тасуирлама битендә был рәсем тураһында һәм уның таратылыу шарттары тураһында мәғлүмәттәр бар.

Description

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.

Source

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

Date

unknown

Author

Scott Bauer

Permission
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.
Other versions

Image:BiodegradablePlasticUtensils.jpg (original)

Image:BiodegradablePlasticUtensils2.jpg (cropped)
Featured picture This is a featured picture. We believe it is one of the finest images on the Wikimedia Commons. 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.
Picture of the day This image was selected as a picture of the day for April 06, 2007. It was captioned as followed:
Česky: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů
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.
Svenska: Biologiskt nedbrytbara knivar, gafflar och skedar kan tillverkas av stärkelse-polyester-material.
简体中文: 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
繁體中文: 以生物可分解的澱粉聚酯物料製成的餐刀餐叉

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