نتایج جستجو برای: squares inversion using acb approach

تعداد نتایج: 4264058  

2004
Sebastien Lambot Idesbald van den Bosch Evert C. Slob

Research has focused on the development of a new integrated approach including ground penetrating radar (GPR) design, GPR signal forward modelling, and GPR signal inversion to estimate the dielectric permittivity and electric conductivity of the shallow subsurface. We propose to use an ultrawide band (UWB) stepped frequency continuous wave (SFCW) radar combined with an offground monostatic tran...

2017
Thierry Dudok de Wit Christophe Coillot Guillaume Jannet V. Krasnoselskikh Matthieu Kretzschmar Jean-Louis Pinçon Fouad Sahraoui Volodya Krasnoselskikh

The ACB search-coil magnetometer for Cross-Scale will measure three components of the AC magnetic field up to 4 kHz, and one component up to 100 kHz. Turbulent and coherent magnetic field fluctuations in the frequency range of ACB play an important role in the acceleration, scattering, and thermalisation of particles; ACB observations will, together with the other instruments of the wave consor...

2014
Iyan E. Mulia Toshiyuki Asano

The characteristics of a tsunami is largely determined by its initial source, which can be defined as a perturbation to the equilibrium state of the ocean hydrodynamic. For tsunamis generated by earthquakes, the initial source (as a form of sea surface deformation) is driven by a coseismic vertical displacement of the seabed. Assuming that the rupture process occurs instantaneously, the sea sur...

2015
Shahram Pourazadi Sadegh Ahmadi Carlo Menon

BACKGROUND One of the recommended treatments for disorders associated with the lower extremity venous insufficiency is the application of external mechanical compression. Compression stockings and elastic bandages are widely used for the purpose of compression therapy and are usually designed to exert a specified value or range of compression on the leg. However, the leg deforms under external ...

2008
Rémi Douvenot Vincent Fabbro Peter Gerstoft Christophe Bourlier Joseph Saillard

[1] This paper introduces a ‘‘refractivity from clutter’’ (RFC) approach with an inversion method based on a pregenerated database. The RFC method exploits the information contained in the radar sea clutter return to estimate the refractive index profile. Whereas initial efforts are based on algorithms giving a good accuracy involving high computational needs, the present method is based on a l...

Journal: :Journal of Geophysics and Engineering 2021

Abstract We present a three-dimensional (3D) general-measure inversion scheme of crosswell electromagnetic (EM) data in the frequency domain with direct forward solver. In problem, we discretised EM Helmholtz equation by staggered-grid finite difference (SGFD) and solved it using Intel MKL PARDISO By applying solver, simultaneously multisource problems at given frequency. inversion, integrated ...

Journal: :Optimization Methods and Software 2014
Zhenhua Li Yanfei Wang

In seismic exploration, regularized migration inversion of seismic data usually requires solving a weighted least-squares problem with constrains. It is well known that directly solving this problem using some decomposition techniques is very time-consuming, which makes it less possible for practical use. For iterative methods, previous research is mainly on solving the inverse model in a full ...

2017
James E. Christensen Natalie E. Taylor Scott J. Hetzel John A. Shepler Tamara A. Scerpella

Background Recent evidence shows a delayed return to sport in children and delayed quadriceps recovery in both adults and children who have undergone anterior cruciate ligament (ACL) reconstruction with concomitant femoral nerve blockade (FNB) compared with those who had no blockade. We evaluated the use of adductor canal blockade (ACB), as an alternative to FNB, at the time of ACL reconstructi...

1997
Susan E. Minko William W. Symes

Full waveform inversion of a p ? marine data set from the Gulf of Mexico provides estimates of the long-wavelength P-wave background velocity, anisotropic seismic source, and three high-frequency elastic parameter reeectivities which explain 70% of the total seismic data and 90% of the data in an interval around the gas sand target. The forward simulator is based on a plane-wave viscoelastic mo...

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