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.
