Harmonic vibrations result from the torsional motion imparted on the crankshaft. These harmonics are a function of many factors including frequencies created by the actual combustion and the natural frequencies the metals make under the stresses of combustion and flexing.
A MND is a ND that incorporates revisions and/or mitigation measures in the proposed project that will avoid or mitigate impacts to a point where clearly no significant impacts on the environment would occur.
That is, we can use a pressure or volume-controlled mode (both generate positive pressure) to deliver ventilation. Thus, the basic concept of NIPPV is the application of positive pressure during the respiratory cycle (inspiration and expiration). The simplest application is that of continuous positive pressure through the respiratory cycle, which is named CPAP. The next level of sophistication is the administration of two different levels of pressure, one for inspiration and one for the expiratory phase.