The diffuse-field assumption in reverberation-room measurements may be misleading, as there is no straight-forward way to characterize sound field diffusivity. In this regard, standards offer some help outlining necessary conditions to achieve sufficient diffusion; however, measurement accuracy is still ...
Under the diffuse field approximation, the full-wave (FW) microtremor H/V spectral ratio (H/V) is modeled as the square root of the ratio of the sum of imaginary parts of the Green’s function of the horizontal components to that of the vertical one. For
Knowledge of the diffuse-field coherence between array sensors is a basic assumption for a wide range of array processing applications. Explicit relations previously existed only for omnidirectional and first-order directional sensors, or a restricted arrangement of differential patterns. We present a clo...
In this case an incoming unit charge causes rearrangement of the collection of charges in the field. In developing the Poisson-Boltzmann equation, these two electrical potentials are assumed to be equal. The significance of this assumption is not clear. An interesting and useful result is ...
Coronary hemodynamic measurements aim to identify the impact of coronary artery disease (CAD) on coronary flow based on the assumption that impaired myocardial perfusion and myocardial ischemia are crucial predictors of adverse clinical outcomes.1,2 Fractional flow reserve (FFR) is defined as the ratio...
Gas permeation through nanopores is a long-standing research interest because of its importance in fundamental science and many technologies. The free molecular flow is conventionally described by Knudsen theory, under the diffuse reflection assumption.
Dielectric measurements were investigated in “fresh grown” Co substituted Barium Titanate crystals; the diffuse phase transition is analysed in two different models. The first one is a thermodynamic approach of the free energy with an apparent local field in the polarization direction: the best valu...
This assumption drives the 1-day averaging of sonar data, with the hope stated previously that the average temperature field will approximate, at least over meter horizontal scales, a stratified medium. Next, consider how the time scaling (6) caused by sound-speed change affects the second echo...
The EFT parameters are: \(\alpha _H\), which is connected to the kinetic mixing between matter and the scalar field introduced by the DHOST theory [20]; and \(\beta _1\), which parameterizes the presence of higher-order operators in the lagrangian [20]. Note also that we assume \...
However, DCS classical algorithms are based on the fundamental assumption that the electric field of the light reaching the DCS photodetector is a zero-mean complex Gaussian variable. The non-validity of this hypothesis might produce inaccurate blood flow estimations. It is shown that for the human...