This paper describes a new technique, called the empirical mode decomposition (EMD), that allows the decomposition of one-dimensional signals into intrinsic oscillatory modes. The components, called intrinsic mode functions (IMFs), allow the calculation of a meaningful multicomponent instantaneous frequency. Applied to a seismic trace, the EMD allows us to study the di erent intrinsic oscillato...

Synthetic aperture radar interferograms from properly selected multiple baselines can be combined in a manner that reduces the uncertainty in surface height estimation and avoids the downfall of traditional phase unwrapping techniques.

A noise-assisted approach in conjunction with multivariate empirical mode decomposition (MEMD) algorithm is proposed for the computation of empirical mode decomposition (EMD), in order to produce localized frequency estimates at the accuracy level of instantaneous frequency. Despite many advantages of EMD, such as its data driven nature, a compact decomposition, and its inherent ability to proc...

Corresponding Author: Yue Cao, PhD Departments of Radiation Oncology, Biomedical Engineering, and Radiology, University of Michigan, Ann Arbor, MI 48109, USA; E-mail: [email protected]

The main function of the operator-based signal separation approach is to construct an operator from a signal and use it to decompose the signal into two subcomponents. The procedure involves two steps: estimating the operator, and decomposing the signal into two subcomponents. Existing approaches estimate the operator’s parameters from the local extrema of a signal. In contrast, we show that th...

Phase unwrapping is probably the most challenging step in the phase retrieval process in phase-shifting and spatial-carrier interferometry. Likewise, phase unwrapping is required in 3D-shape profiling and deflectometry. In this paper, we present a novel phase retrieval method that completely sidesteps the phase unwrapping process, significantly eliminating the guessing in phase reconstruction a...

Methane hydrate formation and dissociation kinetics were investigated in seawater-saturated consolidated Ottawa sand-pack under sub-seafloor conditions to study the influence of effective pressure on formation and dissociation kinetics. To simulate a sub-seafloor environment, the pore-pressure was varied relative to confining pressure in successive experiments. Hydrate formation was achieved by...

The Kovacs effect is a remarkable feature of the ageing dynamics glass forming liquids near transition temperature. It consists in non-monotonous evolution volume/enthalpy after succession two abrupt temperature changes: first from high initial $T_i$ to much lower annealing $T_a$ followed by smaller second jump back slightly higher final $T_f$. change performed when instantaneous value coincide...

the hydrograph at watershed outlet can be expressed as hydrological response of watershed to geomorphological behavior. in present study with the aid of the gis and the concept of instantaneous unit hydrograph, the watershed response was simulated. in present physical method, the iuh is derived from three parameters of time of concentration, storage coefficient and time-area curve of the basin....