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121Software performance testing — In software engineering, performance testing is testing that is performed, to determine how fast some aspect of a system performs under a particular workload. It can also serve to validate and verify other quality attributes of the system, such… …
122High-voltage direct current — HVDC or high voltage, direct current electric power transmission systems contrast with the more common alternating current systems as a means for the bulk transmission of electrical power. The modern form of HVDC transmission uses technology… …
123PID controller — A block diagram of a PID controller A proportional–integral–derivative controller (PID controller) is a generic control loop feedback mechanism (controller) widely used in industrial control systems – a PID is the most commonly used feedback… …
124F-22 Raptor — Infobox Aircraft name= F 22 Raptor type= Stealth Air superiority fighter national origin = United States manufacturers=Lockheed Martin Aeronautics Boeing Integrated Defense Systems caption= Two F 22 Raptors in column flight formation designer=… …
125Maximum power theorem — In electrical engineering, the maximum power (transfer) theorem states that, to obtain maximum external power from a source with a finite internal resistance, the resistance of the load must be made the same as that of the source. It is claimed… …
126Inverter (electrical) — An inverter is an electrical device that converts direct current (DC) to alternating current (AC)[1]; the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. Solid… …
127Dell Inspiron — Logo Dell s Inspiron computer product line started as a range of laptop computers targeted at the entry level, budget, a Mobile Celeron or Mobile Pentium II processor with SDRAM, and had a high starting price of $2,799. Today, though, the… …
128Register machine — In mathematical logic and theoretical computer science a register machine is a generic class of abstract machines used in a manner similar to a Turing machine. All the models are Turing equivalent. Contents 1 Overview 2 Formal definition 3 …
