When shear horizontal ultrasonic guided waves interact with thickness discontinuities in plates, the reflected and transmitted wavefields can be composed of several modes due to mode conversion. It is known that a plate symmetric discontinuity, respect plate’s mid-plane, conversion restricted share same symmetry as incident mode. In this paper, we use an analytical model based on reciprocity pr...

[1] Southern Hemisphere (SH) polar mesospheric clouds (PMCs), also known as noctilucent clouds, have been observed to be more variable and, in general, dimmer than their Northern Hemisphere (NH) counterparts. The precise cause of these hemispheric differences is not well understood. This paper focuses on one aspect of the hemispheric differences: the timing of the PMC season onset. Observations...

Electronic structure calculations, with a triple zeta plus polarization basis set and second-order perturbation theory, are used to predict the molecular and electronic structures for TiH3X compounds, with X = CH3, NH2, OH, SiH3, PHz, and SH. It is found that for the second-period substituents CH3, NHz, and OH the structures are similar to those of the corresponding silicon compounds. On the ot...

The converted electric field in the seismoelectric effect can be used to monitor salinity of reservoir. Compared some conventional excitation methods (e.g., Monopole source), response law borehole shear-horizontal transverse-electric (SH-TE) waves fluid is unique. In order explore its physical mechanism, we study influence on SH-TE wave fields this paper. First, analyze field, simulate for diff...