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Comprehensive analysis of compressible and incompressible nematic flow caused by thermomechanical force
Chemical Physics Letters. 2025. Vol. 883. Article 142528.
S̀liwa I., Maslennikov P., Pasechnik S., Alex V. Zakharov
A numerical study of the effect of thermomechanical force on dissipation processes in a microsized compressible and incompressible hybrid aligned nematics has been carried out. Calculations have shown that under the effect of a temperature gradient , a hybrid aligned compressible and incompressible nematic samples settles down to the stationary flow regimes, and the thermomechanical force strongly influences the directions and magnitudes of . A small quantitative difference was found in the equilibrium distribution of the horizontal velocity component for both compressible and incompressible nematic flow caused by the same , which is set up across the microsized hybrid aligned nematic channel.
Publication based on the results of:
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
Захаров А. В., Düven H., Capar M. I., Physics Letters A 2026 No. 576 Article 131388
Molecular dynamics simulations were carried out to study the structural properties of nematic pentyl
cyanobiphenyl (5CB) and pentyloxy cyanobiphenyl (5OCB) liquid crystals (LCs) doped with gold nanoparti
cles (GNPs) of different numbers, shapes and sizes. The spherical GNPs of two different radii and rod-like have
been doped in 5CB and 5OCB cyanobiphenyl liquid crystals. In order to describe ...
Added: September 17, 2026
Kasapenko N., Orlova T., N. Kondratyuk, Journal of Chemical Physics 2025 Vol. 162 No. 15 Article 154901
Molecular dynamics methods have proven their applicability for the simulation of the structure and properties of liquid crystals. For the reproduction of phase transitions in liquid crystals, many authors have reparameterized the classical force fields. For the first time, we demonstrate that even a general-purpose force field, for example, General AMBER Force Field (GAFF), without ...
Added: August 12, 2025
Romanov M., Yulia O. Koroleva, Journal of Non-Newtonian Fluid Mechanics 2023 Vol. 320 Article 105112
We have studied the two-dimensional axisymmetric Ericksen–Leslie equations with the non-zero inertial constant. The existence and uniqueness of the global weak solution is proved under certain assumptions. In the neighbourhood of the solid surface we derived the boundary layer equations and show that the effective viscosity of the liquid in the boundary layer decreases as ...
Added: January 4, 2024
P. V. Dolganov, K. D. Baklanova, Dolganov V. K., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2022 Vol. 106 No. 1 Article 014703
Focal conic structure formed near the transition from the cholesteric liquid crystal phase into isotropic liquid is studied in planar cells with a combination of optical methods. Employing a procedure with slow variation of temperature, we manage to obtain regions of periodic focal conic structure with two-dimensional square ordering in the plane of the cell. ...
Added: July 14, 2022
P.V. Dolganov, Зверев А. С., K. D. Baklanova et al., Soft Matter 2022 Vol. 18 P. 126–136
We investigated the coalescence of nematic droplets in an isotropic environment and that of isotropic droplets in a nematic environment in quasi-two-dimensional geometry of a flat optical cell. Two different regimes of coalescence were found. In the circular meniscus between the nematic and isotropic regions both nematic and isotropic phases exist. As a result, two bridges form at ...
Added: December 23, 2021
P.V. Dolganov, Zverev A. S., K.D. Baklanova et al., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2021 Vol. 104 No. 1 Article 014702
We observed the formation of small satellite droplets from the bridge at
droplet coalescence. Investigations were made using a Hele-Shaw cell in
the two-phase region at the nematic-isotropic phase transition. In
previous works on coalescence it was considered that before the start of
coalescence there exists a bridge between the outer fluid connecting
regions on the two sides of the ...
Added: October 4, 2021
Shuravin N. S., P.V. Dolganov, Dolganov V. K., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2018 Vol. 98 P. 052705-1–052705-6
Optical investigations and calculation of structures were performed on films of liquid crystal with the sequence of phase transitions in the bulk sample SmC*A − SmC*d3 − SmC*d4 − SmC* − SmC*α − SmA − I . We investigated freestanding nanofilms with number of smectic layers from 2 to 6 with thickness commensurate, smaller, or ...
Added: November 25, 2019
P.V. Dolganov, Cluzeau P., Dolganov V. K., Liquid Crystals Reviews 2019 Vol. 7 No. 1 P. 1–29
In this article we review interactions and collective behavior of inclusions in free-standing smectic films with in-plane orientational ordering. The inclusions interact on large distances and can form various self-organised structures. Topological defects of the director field play a key role in self-organization. Various types of interaction are realized, including dipolar, quadrupolar and interactions of ...
Added: November 21, 2019
Pavel V. Dolganov, Kats E., Dolganov V. et al., Soft Matter 2018 Vol. 14 P. 7174–7179
In this paper we report on observations of unusual linear defects forming spontaneously in polar freestanding smectic-C* films near the temperatures of thinning transitions. At high temperature a periodic structure of defects becomes the ground state of the system. We found that the defects are characterized by continuous rotation of the molecular orientation with a ...
Added: November 21, 2019
Shuravin N. S., P.V. Dolganov, Dolganov V. K., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2019 Vol. 99 No. 6 P. 062702
Freestanding smectic films give a unique possibility to study two-dimensional coalescence. We report experimental investigations in freestanding films and detailed analysis of coalescence of islands, circular regions of larger thickness than the surrounding film. The driving force of island coalescence is the dislocation tension on the boundary between the island and the film. The obtained ...
Added: November 21, 2019
P.V. Dolganov, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2018 Vol. 98 No. 3 P. 032707-1–032707-6
A large number of smectic phases can have the same energy when short-range interlayer interactions (interaction of nearest layers and frustrating next-nearest layer interaction) are taken into account. In this situation even weak long-range interactions become important. They lift the degeneracy and lead to the appearance of a manifold of polar structures with multilayer periodicity. ...
Added: November 21, 2019
P.V. Dolganov, Shuravin N. S., Dolganov V. K. et al., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2017 Vol. 95 No. 1 P. 012711
We report imaging of the director field near edge dislocations in thermotropic antiferroelecric smectic-C*A (SmC*A) liquid crystal. Measurements were made in freestanding films with thickness from two to ten smectic layers. We find two different orientations of the molecular tilt plane with respect to the edge dislocation line. The orientation is determined by the value ...
Added: November 21, 2019
V.V.Lebedev, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2019 Vol. 100 No. 2 P. 022705
We explain theoretical peculiarities of the smectic-A–hexatic-B equilibrium phase coexistence in a finite-temperature range recently observed experimentally in free-standing smectic films [I. A. Zaluzhnyy et al., Phys. Rev. E 98, 052703 (2018)]. We quantitatively describe this unexpected phenomenon within Landau phase transitions theory assuming that the film state is close to a tricritical point. We ...
Added: November 20, 2019
Vladimir V. Lebedev, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2018 Vol. 98 No. 5 P. 1–8
Experimental and theoretical studies of a smectic-A–hexatic-B transition in freely suspended films of thickness 2–10μm of the n-pentyl-4′−n-pentanoyloxy-biphenyl-4-carboxylate (54COOBC) compound are presented. X-ray investigations revealed a discontinuous first-order transition into the hexatic phase. The temperature region of two-phase coexistence near the phase transition point diminishes with decreasing film thickness. The width of this temperature region ...
Added: November 19, 2018
Yablonskii S. V., Kurbatov N. M., Parfenyev V.M., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2017 Vol. 95 No. 1 P. 012707-1–012707-5
We study horizontal streaming excited by means of a low-frequency and low-intensity acoustic wave in 2D freely suspended films of thermotropic smectic liquid crystals. Acoustic pressure induces fast periodic transverse oscillations of the film, which produce in-plane stationary couples of vortices slowly rotating in opposite directions owing to hydrodynamic nonlinearity. The parameters of the vortices ...
Added: October 30, 2017
Kats E. I., V.V.Lebedev, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2015 Vol. 91 P. 032415-1–032415-8
Long-scale dynamic fluctuation phenomena in freely suspended films is analyzed. We consider isotropic films that, say, can be pulled from bulk smectic
A liquid crystals. The key feature of such objects is possibility of bending deformations of the film. The bending (also known as flexular) mode turns out to be anomalously weakly attenuated. In the harmonic ...
Added: October 27, 2016