Nonlinear systemIn mathematics and science, a nonlinear system (or a non-linear system) is a system in which the change of the output is not proportional to the change of the input. Nonlinear problems are of interest to engineers, biologists, physicists, mathematicians, and many other scientists since most systems are inherently nonlinear in nature. Nonlinear dynamical systems, describing changes in variables over time, may appear chaotic, unpredictable, or counterintuitive, contrasting with much simpler linear systems.
Design for testingDesign for testing or design for testability (DFT) consists of IC design techniques that add testability features to a hardware product design. The added features make it easier to develop and apply manufacturing tests to the designed hardware. The purpose of manufacturing tests is to validate that the product hardware contains no manufacturing defects that could adversely affect the product's correct functioning. Tests are applied at several steps in the hardware manufacturing flow and, for certain products, may also be used for hardware maintenance in the customer's environment.
Clock of the Long NowLa Clock of the Long Now, ou Horloge de l'année , est un projet d'horloge mécanique censée fonctionner , initié par la Long Now Foundation. Le projet est élaboré par Danny Hillis en 1986. Le premier prototype d'horloge, d'environ deux mètres de haut, commence à fonctionner le ; il est exposé au Science Museum de Londres. Depuis décembre 2007, deux autres prototypes sont exposés au Long Now Museum & Store au Fort Mason Center à San Francisco. Elle est remise à l'heure presque chaque jour, par le Soleil, s'il brille assez fort.
