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Chapter 5. Introduction to Remote Sensing
hillagric.ac.in5.6 Passive vs. Active Sensing Remote sensing systems which measure energy that is naturally available are called passive sensors. P assive sensors can only be used to detect energy when the naturally occurring energy is available. For all reflected energy, this can only take specular and diffuse reflection .
Fire Protection of Structural Steel
dcstructural.comFire protection systems are classi-fi ed as passive, active, or manual. Pas-sive fi re protection consists of building materials that insulate structural ele-ments from the heat of a fi re, such as spray fi reproofi ng, masonry encasement or rated ceilings. Active fi re protection systems are systems that are intended