In this paper, first the limitations of the ray-based method and the one-way wave-field extrapolation migration (WEM) in imaging steeply dipping structures are discussed by some examples. Then a new method of the reverse time migration (RTM), used in imaging such complex structures is presented. The proposed method uses a new wave-field extrapolator called the Leapfrog-Rapid Expansion Method (L...

Introduction Diffusion tensor imaging (DTI) of the fetal brain is attracting increasing interest [1-3] with recent papers starting to present tractography results [4]. To overcome maternal motion, many studies have been performed using breath-hold methods, although this severely reduces the amount of available data. However, even in breath-held acquisitions, the fetus can move substantially, so...

We generalize the scattering theory of quantum shot noise to include the full spin-density matrix of electrons injected from a spin filtering or ferromagnetic electrode into a quantum-coherent nanostructure governed by arbitrary spin-dependent interactions. This formalism yields the spin-resolved shot noise power for different experimental measurement setups—with ferromagnetic source and ferrom...

Aims: The use of the electronic health record systems has been developed in the health system, but it is still not known whether empathy is created in the visit of the patient despite this system. Therefore, this study was designed with the purpose of comparing patients’ perceptions about physicians’ empathy after the patient viewed standardized and scripted video vignettes of two physicians on...

In this study, the effect of repair on fatigue life of tubular joints is investigated. Six cracked specimens precedently subjected to fatigue loading undergone to weld repair. Two of those specimens were shot peened before primary fatigue loading.  It is shown that repair gives rise to about 150% increase in fatigue life for original specimens while the increase of fatigue life for shot-peened ...

Ultrafast optical diagnostics play a vital role in probing the dynamics in laser-matter interactions, including those observed in the high intensity ultrashort laser pulse regime. We developed a new femtosecond optical diagnostic, single-shot supercontinuum spectral interferometry (SSSI), which measures ultra-rapid transients in the complex index of refraction induced by an intense laser pulse....

in this paper, the hydrogen embrittlement of the high strength cr-si spring steel with after zn-12%ni electroplating, have been evaluated. slow strain rate test with 3.34 × 10 -6 sec -1 strain rate was performed, and the hydrogen embrittlement index of the different samples was calculated. the effect of shot peening before plating and the baking after plating and also the effect of applying a n...

In this paper we analyse the similarities and differences between rational and reactive agent architectures, and propose a unified architecture that aims to capture both as special cases. For this purpose we employ a proof procedure as the thinking component of the agent. The proof procedure combines definitions with integrity constraints. It uses definitions, in logic programming manner, for "...

The nanometer size of gaseous nanobubbles formed in liquids and their physical properties impose limitations to the selection of imaging techniques. The prospectiveex situ imaging method is developed to utilize imprints, which nanobubbles form on immersed polymer surfaces. Polymer nanopattern represent a “snap-shot” record of the nanobubble existence, which can be imagedex post byex situ AFM. T...