This article summarizes the results of investigations dynamics ferroelectric (FE) phase transitions (PTs) obtained in Prague during last 25 years. After a short introduction, explaining differences between displacive and order-disorder types FE PTs, broadband dielectric, THz, mainly IR spectroscopic hydrogen-bonded FEs, BaTiO3, relaxor strained incipient various multiferroics are reviewed. The ...

Soft tissue modeling for the creation of a haptic simulator for training medical skills has been the focus of many attempts up to now. In soft tissue modeling the most important parameter considered is its being real-time, as well as its accuracy and sensitivity. In this paper, ANFIS approach is used to present a nonlinear model for soft tissue. The required data for training the neuro-fuzzy mo...

The structural fluctuation in hexagonal Ba(1-x)Sr(x)Al2O4 with a corner-sharing AlO4 tetrahedral network was characterized at various temperatures using transmission electron microscopy experiments. For x ≤ 0.05, soft modes of q ~ (1/2, 1/2, 0) and equivalent wave vectors condense at a transition temperature (TC) and form a superstructure with a cell volume of 2a × 2b × c. However, TC is largel...