File:BiodegradablePlasticUtensils2.jpg

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Original file (2,548 × 1,757 pixels, file size: 420 KB, MIME type: image/jpeg)
Error creating thumbnail: File missing
This is a featured picture, which means that members of the community have identified it as one of the finest images on the English Wikipedia, adding significantly to its accompanying article. If you have a different image of similar quality, be sure to upload it using the proper free license tag, add it to a relevant article, and nominate it.
Wikipedia logo
This image was selected as picture of the day on the English Wikipedia for July 20, 2007.

Wikipedia

 This is a featured picture on the English language Wikipedia (Featured pictures) and is considered one of the finest images. See its nomination here.

If you think this file should be featured on Wikimedia Commons as well, feel free to nominate it.
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.

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.
Date Unknown date
Source
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.

العربية | English | français | македонски | +/−

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

English ∙ español ∙ 日本語 ∙ 한국어 ∙ македонски ∙ Nederlands ∙ русский ∙ slovenščina ∙ українська ∙ Tiếng Việt ∙ 中文（中国大陆） ∙ 中文（繁體） ∙ +/−

  • noise removed, uncropped, Featured Picture
    noise removed, uncropped, Featured Picture
  • Original
    Original
Desktop wallpaper icon
Desktop wallpaper icon
 This English Wikipedia featured picture is fairly large and has an aspect ratio of approximately 8:5 or 16:9, making it suitable as a widescreen computer wallpaper.

See the gallery of such images, or the gallery of non-widescreen images.

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

media type

image/jpeg

checksum

f53d0c12d076037c647efd26984b3f46a2b1530f

determination method or standard: SHA-1

data size

430,408 byte

height

1,757 pixel

width

2,548 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current20:19, 22 February 2007Thumbnail for version as of 20:19, 22 February 20072,548 × 1,757 (420 KB)wikimediacommons>17Drew~commonswiki{{Information |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

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "http://70.231.62.181/index.php?title=File:BiodegradablePlasticUtensils2.jpg&oldid=14368261"