نتایج جستجو برای: phase inversion
تعداد نتایج: 639871 فیلتر نتایج به سال:
In this work, we employ a Bayesian inversion framework to fluid-filled phase-field fracture. We develop robust and efficient numerical algorithm for hydraulic fracture toward transversely isotropic orthotropy anisotropic the fluid-driven coupled problem, three primary fields pressure, displacements, crack are solved while direction-dependent responses (due preferred fiber orientation) enforced ...
In this study, nonlinear wave phenomena related to reections and transmissions of the phase-inversion-waves around the discontinuity of the system consisting of two parts of coupled van der Pol oscillators are investigated. Behavior of the phase-inversion-waves around a discontinuity in a coupled system consisting of two kinds of arrays of van der Pol oscillators classi ed into 8 types by compu...
Design of output tracking controllers for nonlinear nonminimum phase systems is challenging. Among existing methods the regulation approach usually leads to large transient errors while the classical inversion approach results in unbounded internal dynamics for nonminimum phase systems. In this paper, stable inversion is applied to the design of tip trajectory tracking for a single-link flexibl...
BACKGROUND AND PURPOSE Synthetic MR imaging enables the creation of various contrast-weighted images including double inversion recovery and phase-sensitive inversion recovery from a single MR imaging quantification scan. Here, we assessed whether synthetic MR imaging is suitable for detecting MS plaques. MATERIALS AND METHODS Quantitative and conventional MR imaging data on 12 patients with ...
Magnetic resonance elastography (MRE), a phase contrast MRI technique, images the propagation of applied mechanical waves in tissue, allowing shear stiffness to be quantified in vivo. This MRE technique has been validated with static mechanical compression tests. Dynamic mechanical analysis (DMA) may be a more appropriate comparison to MRE because it directly measures the shear modulus dynamica...
S U M M A R Y A new technique for multimode dispersion measurement has been developed by employing fully non-linear waveform inversion for a path-specific 1-D profile using a neighbourhood algorithm (NA). One-dimensional models derived from waveform inversion are quite sensitive to the model parametrization and the reference model used to start the inversion. With different approaches to the pa...
The phase inversion from a morphology of hydroxypropylcellulose in water ~HPC50%! droplets in polydimethylsiloxane ~PDMS! matrix to a morphology of PDMS droplets in HPC50% matrix can be induced by a change of shear rate, due to a viscosity ratio inversion. Such a process passing through four different transient morphological stages was studied by optical microscopy in a transparent shear device...
Because of the absence of a center of inversion in some superconducting compounds, a p-wave admixture to the dominant d-wave (or s) order parameter must exist. If time reversal is also violated, an allowed invariant is the product of the d wave (or s wave), p wave, and an appropriately directed current. We show that this leads to a new and remarkable property of the Josephson current for tunnel...
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