In the present paper the thermodynamic and phenomenological descriptions of the crossflow piezo-electrooptic effect in crystals have been made. For example the necessary experimental measurements of this effect have been carried out in the lithium tantalate crystals. For these crystals at first the P33113−P11113 = −4.6·10 m/ N·V absolute coefficients difference of crossflow piezo-electrooptic e...

Sperm immobilization prior to intracytoplasmic sperm injection (ICSI) is thought to be necessary for efficient fertilization. A variety of methods of sperm immobilization (pipetting, squeezing and piezo application) are currently employed in ICSI. The effect of differences in immobilization method on the timing of initial Ca(2+) oscillations of oocytes in ICSI was investigated. Motile spermatoz...

The aim of this study was to evaluate histomorphometrically the influence of two techniques of dental implant site preparation on bone healing around titanium implants. Fifteen male Wistar rats (±300 g) were used in the study. Each tibia was randomly assigned to receive the implant site preparation either with a conventional drilling technique (control - DRILL group) or with a piezoelectric dev...

The article presents a construction, static testing and modelling of a single flapper nozzle pneumatic valve. Authors show testing of piezo tube PT230 which distinguishing feature is deflection in two directions. This testing is preliminary work in design of a novel electropneumatic valve. Studies have been performed on a special designed bench which consists of a pneumatic valve, which used pi...

Piezo-electric devices possess the ability to produce high voltages without load. However, to harvest this energy, the complex and capacitive internal structure must be deal with. This capacitive behavior makes the AC-DC conversion too involved. If a buck-boost topology is to be designed to regulate the DC output, the discontinuous mode provides constant input impedance for small amount of powe...

Flexoelectricity, in which a dielectric material develops an electrical polarization response to mechanical strain, is important degree of freedom for designing actuators with simpler structure and higher performance. Its applications are usually limited the nanoscale, though, due phenomenon's inherent size dependence. This study presents $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}v\phant...

Microvilli (stereocilia) projecting from the apex of hair cells in the inner ear are actively motile structures that feed energy into the vibration of the inner ear and enhance sensitivity to sound. The biophysical mechanism underlying the hair bundle motor is unknown. In this study, we examined a membrane flexoelectric origin for active movements in stereocilia and conclude that it is likely t...

Biological membranes are capacitors that can be charged by applying a field across the membrane. The charges on the capacitor exert a force on the membrane that leads to electrostriction, i.e. a thinning of the membrane. Since the force is quadratic in voltage, negative and positive voltage have an identical influence on the physics of symmetric membranes. However, this is not the case for a me...

Parpaite and Coste introduce Piezo channels and their role in mechanotransduction.