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what is photodna?

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PhotoDNA  is a technology developed by  Microsoft  and improved by  Hany Farid  of  Dartmouth College  that computes  hash  values of images, video and audio files to identify similar images. [1]  PhotoDNA is primarily used in the prevention of child pornography, and works by computing a unique hash that represents the image. This hash is computed such that it is resistant to alterations in the image, including resizing and minor color alterations. [1]  It works by converting the image to black and white, resizing it, breaking it into a grid, and looking at intensity gradients or edges. [2] It is used with Microsoft's own services  Bing  and  OneDrive , [3]  as well as by  Google Gmail ,  Twitter , [4]   Facebook , [5]   Adobe Systems [6]  and the  National Center for Missing & Exploited Children , [7]  to whom Microsoft donated the technology. Microsoft donated the ...
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A new type of transistor

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SOLUTION FOR NEXT GENERATION NANOCHIPS COMES OUT OF THIN AIR.    Instead of sending electrical currents through silicon, it sends electrons through narrow air gaps, where they can travel unimpeded as if in space. The device eliminates the use of a semiconductor, making it faster and less prone to heating up.  “Every computer and phone has millions to billions of electronic transistors made from  silicon, but this technology is reaching its physical limits where the silicon atoms get in the way  of the current flow, limiting speed and causing heat,” lead author Shruti Nirantar said.  “ Our air  channel transistor technology has the current flowing through air, so there are no collisions to  slow it down and no resistance in the material to produce heat .”  The design solved a flaw in traditional solid channel transistors – they are packed with atoms, according to the team. This means electrons passing through them collide, sl...
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Solar Technologies going to be Cheaper

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Molten Salt Storage Technology.  A company called Novatec Solar recently commissioned a promising energy storage solution for solar PV systems using a molten salt storage technology. The process uses inorganic salts to transfer energy generated by solar PV systems into solar thermal using heat transfer fluid rather than oils as some storage system have. The result is that solar plants can operate at temperatures over 500 degrees Celsius, which would result in a much higher power output. This means that costs to store solar would be lowered significantly and utility companies could finally use solar power plants as base load plants rather than to meet peak demand during prime daylight hours. By 2020, solar technologies could account for a significant portion of global power generation, helping economies and businesses guard against rising energy costs and the impact of climate change. However, finding opportunities to further reduce the cost of solar technologies will be ...
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