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=== Other uses in science and technology === * [[Selective dissemination of information]] * [[Silt density index]] in reverse osmosis systems * [[Smoke-developed index]], the concentration of smoke emitted by a material * [[Spiral Dynamics Integral]], a model of evolutionary development * [[Stand density index]], of the stocking of a stand of trees * [[Drip irrigation#Subsurface drip irrigation|Subsurface drip irrigation]] * [[Suction Diesel Injection]], a Volkswagen diesel engine
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