Purpose. The research purpose is to apply an original combined approach the study of landslide occurrence in Tarzoust region, based on geophysical approaches. This extremely important because landslides damage roads and buildings many parts North Africa, especially city Tarzoust, NE Algeria. Significant slope failures have resulted serious disasters region. Methods. In this we use Vertical Elec...

Several possibilities for the use of elastic light scattering in the backscatter range (scattering angle theta(s) > 140 deg) for determination of size, velocity, and refractive index of spherical particles are investigated. First the phase Doppler technique is considered. Numerical simulations of light scattering with the Lorenz-Mie theory are used to show that the phase Doppler technique is un...

The boundary problem of linear classical optics about the interaction of electromagnetic radiation with a thin dielectric film has been solved under explicit consideration of its discrete structure. The main attention has been paid to the investigation of the near-zone optical response of dielectrics. The laws of reflection and refraction for discrete structures in the case of a regular atomic ...

This article presents, almost without any analytical analysis, an orderly and illustrated presentation of the atmospheric—or terrestrial—refraction effects, i.e., affecting vision apparent shape position objects located in atmosphere, contrary to case astronomical refraction. The adopted classification, which is non-exhaustive as there are still mysterious atypical cases, mostly based on transf...

PURPOSE To evaluate the trends in corneal refractive procedure selection for the correction of myopia, focusing on the relative proportions of laser in situ keratomileusis (LASIK) and surface ablation procedures. METHODS Only eyes that underwent LASIK or surface ablation for the correction of myopia between 2008-2011 were included in this retrospective study. Additional recorded parameters in...

Purpose. To evaluate the correlation between peripapillary retinal nerve fibre layer (RNFL) thickness and both age and refraction error in healthy children using optical coherence tomography (OCT). Patients and Methods. 80 healthy children with a mean age of 9.1 years (range 3.8 to 16.7 years) undergoing routine ocular examination at the orthoptic section of the Ophthalmology Department were re...

[1] We present results from a wide-angle seismic refraction survey over Shatsky Rise, a large oceanic plateau in the northwestern Pacific. A new Monte Carlo sampling scheme is developed to explore comprehensively the model space of crustal velocity structure by joint refraction and reflection seismic tomography. The new scheme, which is founded on the notion of adaptive importance sampling, is ...

Seabed surveying is the basis of engineering development in shallow waters. At present, geophysical survey methods mainly utilize sonars for qualitative surveying, which requires calibration results found through situ drilling and sampling. Among them, parameters required designs are obtained from either tests or laboratory experiments soil samples retrieved drilling. However, experience onshor...

Three-dimensional (3D) tomographic reconstruction in confined-space requires a mapping relationship which considers the refraction distortion caused by optical walls. In this work, tomography method, namely full-field cross-interface computed (FCICT), is proposed to solve confine-space problems. The FCICT method utilizes Snell’s law and reverse ray-tracing analytically correct imaging establish...