Contact Email: aazaaz@inbox.ru, Professor Dr. Aleksey Anatolievich Zakharenko, Diploma Engineerphysicist, Diploma Programmer, Diploma manager, the IIZWs creator and researcher. Several hot MS/PhDprojects are available here. 
International Institute of Zakharenko waves 
Possession of the Internationsl Institute of Zakharenko Waves (IIZWs). Please, support the Internationsl Institute of Zakharenko Waves’ research here.
Studying subjects: Different dispersive waves such as Rayleigh, Lamb, and Love type waves.
Achievements: · It is thought that the nondispersive Zakharenko type waves representing extreme points of the phase velocity V_{ph}(kd), where k is the wavenumber and d is the plate thickness, can be found in the lowestorder modes of Lamb type waves, when the waves are studied in commonly used [100] and [110] propagation directions in crystals, for instance, nonpiezoelectric cubic crystals (metals). It is also thought that the nondispersive Zakharenko type waves cannot exist in the modes of Lamb waves propagating in isotropic plates that must be verified in experiments. · It was numerically discovered new dispersive shearhorizontal surface waves called ultrasonic surface Zakharenko waves (USZW), which can exist in some suitable propagation directions of piezoelectric coated crystals satisfying the condition of perpendicularity between the wave propagation direction and an odd order symmetry axis, in which the dispersive surface BleusteinGulyaev waves cannot exist, for example, in layered structures consisting of cubic crystals ([101]propagation direction for both media). Also, unusual modes of Love type waves were found in the layered structures consisting of two piezoelectric cubic crystals. Concerning piezoelectric cubic crystals, interesting solutions were analytically found studying [101]propagation direction in the crystals. The solutions correspond to the phase velocity V_{ph}_{0} = V_{t}_{4}a_{K} with a_{K} = 2[K(1 + K^{2})^{1/2} – K^{2}]^{1/2} being less than the speed V_{t} = V_{t}_{4}(1 + K^{2})^{1/2} of the bulk shearhorizontal (SH) wave (V_{t}_{4} = (C_{66}/ρ)^{1/2}). A strong dependence V_{ph}_{0}(K^{2}) on the socalled static coefficient of electromechanical coupling (CEMC) K^{2} was found. It was also found that for the phase velocity V_{ph} < V_{ph}_{0} there are all complex roots for any K^{2} including the special case of K^{2} = 1/3 where V_{ph}_{0} = V_{t}. And for V_{ph}_{0} < V_{ph} < V_{t} the roots depend on K^{2}: the roots are pure imaginary in monocrystals with K^{2} < 1/3, but real for strong piezoelectric cubic crystals with K^{2} > 1/3. The interesting feature is a very slow velocity V_{ph}_{0} in weak piezoelectrics with K^{2} < 1% (even K^{2} << 1%). The V_{ph}_{0} calculation can be useful for finding new shearhorizontal (SH) surface waves. The nondispersive USZWwaves were discovered in my work: A.A. Zakharenko, JZUSA, 2007. · It was analytically shown the possibility to find in crystals the other type of surface waves, representing a new supersonic surface wave, polarized in the sagittal plane, like the surface Rayleigh waves are polarized, with the phase velocity, which is greater than the speed V_{l} of the bulk longitudinal wave. Also, the anisotropy coefficient C^{2} = [(C_{11} – C_{55})(C_{33} – C_{55}) – (C_{13} + C_{55})^{2}]/(C_{33}C_{55}) (see A.A. Zakharenko, NonDTE, 2006, and A.A. Zakharenko, ActaAA, 2005) was introduced representing an universal characteristics for Rayleighpolarized waves propagating in monocrystals and layered systems of all anisotropy classes. I have found that the surface Rayleigh type waves can exist, if there is the following condition for negative C^{2} > – 1 – C_{11}/C_{33} – 2(C_{11}/C_{33})^{1/2}. · It was numerically discovered the existence possibility of a new type of dispersive leaky waves in layered systems with polarization, like the Lovewave (shearhorizontal) polarization. These new leaky type waves are called the dispersive leaky Zakharenko type waves (see A.A. Zakharenko, JSV, 2005). It is noted that dispersive leaky Sezawa type waves possessing the Rayleighwave polarization, as well as dispersive surface Rayleigh type waves, are readily observed with the same experimental technique. · It was found that supersonic surface Love type waves can exist in layered systems owing to the anisotropy factor a_{f} = (C_{44}C_{66} – C_{46}^{2})^{1/2}/C_{44}, in which such substrates as Muscovite, Phlogopite and Biotite (common micas) are used. Such shearhorizontal supersonic surface LTWwaves can propagate with phase velocity which is greater than the speed V_{l} of the bulk longitudinal wave for Diamond, V_{l} ~ 17500 [m/s] representing the fastest known velocity in Acoustoelectronics. (See A.A. Zakharenko, NonDTE, 2005). Also, the paper (A.A. Zakharenko, NonDTE, 2005) offers a method for allround automation of filter and sensor characterization, as well as production. · It was also discovered two new types of surface waves (slow surface Zakharenko modes possessing slow speeds, single modes and the LTWpolarization with the phase velocity less than the LTW phase velocity). One new type of surface waves can also exist when the LTWwaves can not propagate. (See A.A. Zakharenko, NonDTE, 2005). The slow surface Zakharenko waves can be used for sensor and filter applications, like asymmetric Lamb waves (flexural plate waves) with the Rayleighpolarization are used generally operating in the 110 MHz frequency range. In general, technical devices are based on waves with a velocity lower than that of sound in liquids. Currently, there is a great interest to Capacitive Micromachined Ultrasonic Transducers (CMUTs) of microelectromechanical system (MEMS) structures on the Lamb waves in integrated circuit (IC) technology. The CMUTs can be also done on the slow surface Zakharenko waves that could be even technologically preferable resulting in device prize reduction. · It was also studied the nondispersive Zakharenko waves (see A.A. Zakharenko, ActaAA, 2005), including quantum systems, such as both the bulk and surface elementary excitations in the liquid heliumII (see also A.A. Zakharenko, Forum Acusticum, Budapest, Hungary, 2005; A.A. Zakharenko, JZUS A, 2007; A.A. Zakharenko, WRCM, 2007; A.A. Zakharenko, PRAMANA, 2007).
