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Imaging a Flame with Schlieren Photography
Schlieren photography is an optical imaging technique that allows for the visualization of small differences in index of refraction. This makes inhomogeneities, such as temperature, pressure, or composition, in normally transparent materials easily observable with a camera.
Hot air rising upwards from an open flame results in billowing clouds when imaged with this technique. This occurs because hot air refracts light slightly differently than the cooler air around it (i.e. hot air has a different index of refraction). A schlieren camera is extremely sensitive to the resulting changes in optical path caused by these variations.
The schlieren phenomenon was first discovered by Robert Hooke in 1665 but the current technique was not developed until the mid 19th century by the physicists Jean Bernard Léon Foucault and August Toepler. It was originally used to detect flaws in glass used for making lenses but has since been adopted for studying aerodynamics and fluid flow.
Source: https://youtu.be/mLp_rSBzteI (Harvard)
Learn More: https://youtu.be/4tgOyU34D44
#ScienceGIF #Science #GIF #Schlieren #Photography #Optics #Index #Refraction #Air #Optical #Flame #Physics
Schlieren photography is an optical imaging technique that allows for the visualization of small differences in index of refraction. This makes inhomogeneities, such as temperature, pressure, or composition, in normally transparent materials easily observable with a camera.
Hot air rising upwards from an open flame results in billowing clouds when imaged with this technique. This occurs because hot air refracts light slightly differently than the cooler air around it (i.e. hot air has a different index of refraction). A schlieren camera is extremely sensitive to the resulting changes in optical path caused by these variations.
The schlieren phenomenon was first discovered by Robert Hooke in 1665 but the current technique was not developed until the mid 19th century by the physicists Jean Bernard Léon Foucault and August Toepler. It was originally used to detect flaws in glass used for making lenses but has since been adopted for studying aerodynamics and fluid flow.
Source: https://youtu.be/mLp_rSBzteI (Harvard)
Learn More: https://youtu.be/4tgOyU34D44
#ScienceGIF #Science #GIF #Schlieren #Photography #Optics #Index #Refraction #Air #Optical #Flame #Physics
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Create a Bitcoin Price Index Watcher in HTML5
Learn to create a Bitcoin Price Index Watcher in HTML5. In that tutorial, you will learn to make AJAX requests to get the Bitcoin Price Index from the Coin Desk API in US Dollars, Great Britain Pounds and Euros. Then, you will learn to parse JSON data with the standard JSON API in Javascript.
Let us know your thoughts concerning this tutorial in comments.
#Bitcoin #Price #Altcoin #Index #CoinDesk #API #Javascript #JSON #Parse #Parsing #CoinDesk #Tutorial #Web #WebDev #HTML5 #HTML #Create #Learn #IndieDev
Learn to create a Bitcoin Price Index Watcher in HTML5. In that tutorial, you will learn to make AJAX requests to get the Bitcoin Price Index from the Coin Desk API in US Dollars, Great Britain Pounds and Euros. Then, you will learn to parse JSON data with the standard JSON API in Javascript.
Let us know your thoughts concerning this tutorial in comments.
#Bitcoin #Price #Altcoin #Index #CoinDesk #API #Javascript #JSON #Parse #Parsing #CoinDesk #Tutorial #Web #WebDev #HTML5 #HTML #Create #Learn #IndieDev
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# Author’s Citation Search in the Social Sciences Citation Index (SSCI) Library Guide Series Introduction Academic authors are often interested in finding out who is reading and citing their work. Listed below are some suggested steps to do a “cited…
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# U.S. Social Security Death Index, 1935-2014 Source Information Ancestry.com. U.S. Social Security Death Index, 1935-2014 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2011. Original data: Social Security Administration. Social…
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