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SCIENTIFIC ACTIVITIES

Nonlinear dynamics
Activity includes investigation of the physical properties of an electrodynamic loudspeaker in the nonlinear regime when a chaotic state appears and persists for 5 minutes, which enables a detailed time series analysis. The role of air viscosity in the physical properties of the loudspeaker is investigated. Hot wire anemometry is extended to high frequencies by the use of a four-probe resistance evaluation of a sensor made of platinum wire.

Superconductivity
The former sporadic and poorly reproducible appearances of superconductivity, which extended up to room temperature, were related to an old idea of V. Ginzburg based on the possible excitonic superconductivity in a composite system consisting of metallic particles dispersed in a semiconducting matrix. New generations of samples are under preparation in various composites and reproducibility is substantially increased.

Geometric ordering and Bingham fluids
Natural fibers like cotton, hemp, or bamboo dispersed in high-viscosity fluids exhibit ordering owing to the high ratio of length to cross-section. The study of dispersions consisting of natural filaments offers many opportunities in fundamental research and opens a wide area of applications, especially in the technology of high-quality glues.

Polymer–nanoparticle composites
Magnetic nanoparticles dispersed in highly viscous polymer matrices obey interesting statistics due to the interaction with polymer chains. In solid polymer matrices, magnetic nanoparticles are agitated by strong magnetic fields, which results in the branching of polymeric chains having potentially important industrial applications.

Nanoscale magnetism
The first successful synthesis of the paramelaconite Cu4O3 in AVAC opened new opportunities for the study of long-range Dzyaloshinsky-Moriya ferromagnetic interaction, ferromagnetic exchange interaction, and superparamagnetism.

Physics of woods
Lateral strand board (LSB) has been patented by AVAC, and acoustic absorption properties were measured by the shift of the resonance frequency of the Kundt’s tube. Other methods of making absorption measurements will be performed and potential applications will be investigated.