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A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. [ 1 ] [ clarification needed ] Small whirlpools form when a bath or a sink is draining. More powerful ones formed in seas or oceans may be called maelstroms ( / ˈ m eɪ l s t r ɒ m , - r ə m / MAYL -strom, -strəm ).
Since these systems do not work by exchanging ions, like traditional water softeners do, one benefit claimed for the user is the elimination of the need to add salt to the system. Such systems do not remove minerals from the water itself. Rather, they can only alter the downstream effects that the mineral-bearing water would otherwise have.
The H27A is a modern version of the H25A, a reliable motor displacing 2.7 L (2,736 cc), coming from an 88 mm × 75 mm (3.46 in × 2.95 in) bore and stroke (VVT added in 2006). The engine is tuned to achieve most of its torque at low revs at the expense of raw power at high revs, making the engine very responsive in day-to-day driving.
A water power engine includes prime movers driven by water and which may be classified under three categories: [1]. Water pressure motors, having a piston and cylinder with inlet and outlet valves: their action is that analogous of a steam- or gas-engine with water as the working fluid – see water engine
The largest possible design of a water engine is the directly acting water-column engine or water column machine [3] (German: Wassersäulenmaschine). Such devices had been in use for pumping purposes in different mining areas since the middle of the eighteenth century and one was used, for example, by Georg Friedrich von Reichenbach in 1810 to ...
In most of these the outer cylinders were at 60° to the central one, though a contemporary diagram [3] shows one, described as the cross channel engine, with a 55° angle. They were all air-cooled inlet-over-exhaust engines ; each exhaust valve was controlled from below by a cam in the crankcase. [ 2 ]
This page was last edited on 16 May 2006, at 07:08 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
In the subject area of control theory, an internal model is a process that simulates the response of the system in order to estimate the outcome of a system disturbance. The internal model principle was first articulated in 1976 by B. A. Francis and W. M. Wonham [1] as an explicit formulation of the Conant and Ashby good regulator theorem. [2]
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