Separating turbofan engine noise sources using auto and cross spectra from four microphones... The auto- and cross spectra in the frequency range below 1000 Hz are fitted with a noise propagation model based on a source couplet consisting of a single incoherent monopole source with a single coherent monopole source or a source triplet consisting of a single incoherent monopole source with two coherent monopole point sources...
The equivalent force system of a monopole source in a fluid-filled open boreholeThe elastodynamic body-wave field outside a fluid-filled open borehole due to a monopole source in the fluid, is reduced to the radiation-field due to a suitable equivalent force system (EFS) in the absence of the borehole, consisting of a monopole plus a vertical dipole...
Equivalent monopole source of the geomagnetic south atlantic anomaly...Among the possible speculations, one is made regarding the topography of the core-mantleboundary (CMB) and its possible aspect underneath the SAA region in terms of simple sinusoidal undulations met by the monopole source during its centennial motion
Equivalent monopole source of the geomagnetic south atlantic anomaly... In this paper we model the space–time evolution of this anomaly over the past 400 years in terms of the resultant between a decrease of a global axial dipole and an increase of a virtual local monopole source...
