We investigate the application of artificial neural networks (ANNs) to the classification of spectra from impact-echo signals. In this paper we provide analyses from simulated signals and the second part paper details results of lab experiments. The data set for this research consists of sonic and ultrasonic impact-echo signal spectra obtained from 100 3D-finite element models. These spectra, a...

the foremost constant and incessant social development in history of persian gulf is “immigration and population displacement” at both sides of this region. this phenomenon is so important that no one may comprehend properly the events and incidents occurred in this region particularly at pre- petroleum exploration regardless of investigation and considering this issue in mind. if we divide per...

The displacement- and frequency-noise-free interferometer (DFI) is a multiple laser interferometer array for gravitational-wave detection free from both the displacement noise of optics and laser frequency noise. So far, partial experimental demonstrations of the DFI have been done in 2D table top experiments. In this Letter, we report the complete demonstration of a 3D DFI. The DFI consists of...

The results of the asymmetric magneto-optical rotation in magnetoplasmonic nanocomposite study are presented. asymmetry is observed spectra when a medium with plasmonic subsystem magnetized along or against radiation wave vector. as vertical displacement hysteresis loop too. Such detected nanocomposite, which consists layer Bi substituted iron-garnet intercalated gold self-assembled nanoparticl...

The high data rate and advanced technology of modern radar systems make them attractive instruments for measuring the properties of random wave fields. When the objective is wave research, it is particularly important that the relation between wave field properties and radar output be clear and unequivocal. This is generally the case in the measurement of radar range (altimetry), the measuremen...

In seismic resistance design, the design seismic motion is usually defined by elastic response spectra to reflect the characteristic in frequency. Whilst, either the phase of a reference seismic record or random phase is used in generation of artificial wave. The influence of phase on structural response can not be properly defined, as it is often omitted for linear elastic responses. But for t...

The philosophy underlining the Level 1 and Level 2 ASAR Wave Mode algorithms is described. The resulting products are also described including the limitations that need to be understood in order for them to be correctly interpreted. In addition, the Introduction Section contains a brief review of the history of the development of the ASAR Wave Mode products. Introduction There are 3 Wave Mode p...

Low frequency (O(10 Hz-10 kHz)) vibration excitation of capillary waves has been extensively studied for nearly two centuries. Such waves appear at the excitation frequency or at rational multiples of the excitation frequency through nonlinear coupling as a result of the finite displacement of the wave, most often at one-half the excitation frequency in so-called Faraday waves and twice this fr...

233 hours of high-precision vertical wind and temperature measurements in the mesosphere and lower thermosphere (MLT) were used to study the spectra of gravity wave perturbations in the mesopause region. The temperature spectra are generally consistent with the theoretical predictions of gravity wave theory. The averaged slope of the frequency (f) spectra is –1.83±0.08, while the slope of the v...