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4-dimensional printing (4D printing; also known as 4D bioprinting, active origami, or shape-morphing systems) uses the same techniques of 3D printing through computer-programmed deposition of material in successive layers to create a three-dimensional object. However, in 4D printing, the resulting 3D shape is able to morph into different forms ...
4D or 4-D primarily refers to: 4-dimensional spacetime: three-dimensional space of length, ... 4D, a photo print size for digital cameras; Arts and entertainment
A four-dimensional product (4D product) considers a physical product as a life-like entity capable of changing form and physical properties autonomously over time. It is an evolving field of product design practice and research linked to similar concepts at the material scale (programmable matter and four-dimensional printing), however, typically utilizes sensors and actuators in order to ...
4D printing From a page move : This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.
Four-dimensional space (4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.
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The pure = supergravity action in four dimensions is the combination of the Einstein–Hilbert action and the Rarita–Schwinger action [5] Pure 4D N=1 supergravity action S = M P 2 2 ∫ d 4 x e R − M P 2 2 ∫ d 4 x e ψ ¯ μ γ μ ν ρ D ν ψ ρ . {\displaystyle S={\frac {M_{P}^{2}}{2}}\int d^{4}x\ eR-{\frac {M_{P}^{2}}{2}}\int d^{4}x ...
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