跳转到内容

File:Snowflake 300um LTSEM.jpg

页面内容不支持其他语言。
这个文件来自维基共享资源
维基百科,自由的百科全书

原始文件 (5,400 × 3,600像素,文件大小:2.62 MB,MIME类型:image/jpeg


Low temperature scanning electron microscope [1] archive copy at the Wayback Machine magnification series, from 93x to 36,000x magnification series, of a snow crystal.

Most samples of snow crystals are observed by researchers at relatively moderate magnifications (30X-500X), however the capabilities of the electron microscope allow observation of fine structures at over 100,000X. The following set of photographs demonstrates a magnification series using a low temperature scanning electron microscope (LT-SEM) covering this range. By contrast, the light microscope is only capable of viewing meaningful details at magnifications of about 1,000X and is very limited in depth of field. Snow samples are very fragile and exposure to the light necessary to photograph them, using light microscopes, can change structures and even melt them. Using LT-SEM, samples are frozen to temperatures below -170 degrees Centigrade where they can be placed in a vacuum and observed for many hours with no structural changes. These photographs show the extraordinary symmetry of snow crystals even at high magnification. Magnification bars are accurate but X factors (lower left) are for 8"x10" prints.

   Downsampled version is here: Image:Snowflake 300um LTSEM_Edited.jpg

Source: http://www.anri.barc.usda.gov/


Public domain This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture.

العربية  dansk  Deutsch  English  español  فارسی  français  italiano  日本語  македонски  മലയാളം  Nederlands  português  sicilianu  Türkçe  Tiếng Việt  中文  +/−

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

版权状态 简体中文(已转写)

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2006年1月3日 (二) 10:272006年1月3日 (二) 10:27版本的缩略图5,400 × 3,600(2.62 MB)Brian0918
2006年1月3日 (二) 10:112006年1月3日 (二) 10:11版本的缩略图3,400 × 2,267(2.03 MB)Brian0918Low temperature scanning electron microscope [http://www.anri.barc.usda.gov/emusnow/4100/4100.htm] magnification series, from 93x to 36,000x magnification series, of a snow crystal. <br><br>''Most samples of snow crystals are observed by researchers a

以下2个页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据