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‘A Swiss cheese-like material’ that can solve equations | Penn Today
This is incredibly cool.
“For example," Engheta says, "if you were trying to plan the acoustics of a concert hall, you could write an integral equation where the inputs represent the sources of the sound, such as the position of speakers or instruments, as well as how loudly they play. Other parts of the equation would represent the geometry of the room and the material its walls are made of. Solving that equation would give you the volume at different points in the concert hall.” 

In the integral equation that describes the relationship between sound sources, room shape and the volume at specific locations, the features of the room — the shape and material properties of its walls — can be represented by the equation’s kernel. This is the part the Penn Engineering researchers are able to represent in a physical way, through the precise arrangement of air holes in their metamaterial Swiss cheese. 

“Our system allows you to change the inputs that represent the locations of the sound sources by changing the properties of the wave you send into the system,” Engheta says, “but if you want to change the shape of the room, for example, you will have to make a new kernel.” 
computing  analog  computers  hardware  papers  swiss-cheese  equations 
march 2019 by jm
Mathematicians Seal Back Door to Breaking RSA Encryption | Quanta Magazine
Digital security depends on the difficulty of factoring large numbers. A new proof shows why one method for breaking digital encryption won’t work.
Cryptography  HEALTH  abstractions  cambridge  computer  crypto  encryption  equations  factoring  factors  math  mathematics  maths  notes  number  numbers  of  polynomial  prime  rsa  science  security  theory  university 
january 2019 by xer0x
Defence Calculation | Tribal Wars - EN
Formula for calculating damage in Tribal Wars.
game  equations 
december 2018 by ixwt
LaTeX - A document preparation system
LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation. LaTeX is the de facto standard for the communication and publication of scientific documents.
latex  language  math  mathematics  engineering  symbolic  equation  equations 
december 2018 by sparky989
Lens focus Depth of Field White paper
Depth of Field in Depth
By Jeff Conrad for the Large Format Page. Referenced by Wikipedia DOF page.
Photography  lens  optics  depth-of-field  dof  camera  equation  equations  reference  online  engineering  focal-length  hyperfocal-distance 
november 2018 by sparky989

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