Effect of viscosity on the conditions for the formation of centrifugal solitons in the translational-rotational flow of a liquid

The viscosity of the medium is taken into consideration in deriving an evolution equation describing the propagation of non-linear centrifugal waves along the free surface of a translational-rotational liquid flow. The result is the Burgers-Korteweg-de Vries (BKdV) equation, for which a steady solution is described in the form of a shock wave with soliton oscillators near the front. Estimates are presented for the effect of viscosity on the wave-front structure and the conditions of formation previously predicted by the author /1/ for centrifugal solitons, which play an important role in various atmosphere processes^**.     

Electronic and optical properties of carbon supracrystalline <Emphasis Type="Italic">sp</Emphasis> <Subscript>2</Subscript> nanoallotropes

Electronic and optical properties of 2D conducting carbon supracrystals are studied. The band structure is calculated using the tight-binding method. One sample is classified as semimetal, and the remaining samples are classified as narrow-band-gap semiconductors. The optical conductivity of the supracrystalline structures is calculated. It is demonstrated that the conductivity of semimetal supracrystals may be substantially higher than the grapheme conductivity. Complex refractive indices of the supracrystals are estimated.     

Electrohydrodynamic instabilities inn-n +- andp-p +-junctions with a longitudinal drift current

We analyze convective instabilities of the free-carrier dynamics inn-n ⁺- andp-p ⁺-junctions with a longitudinal drift current in one of the contact layers using the hydrodynamic approximation which we formulated. State Technical University of Ul'yanovsk, Ul'yanovsk, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 11, pp. 1105–1111, November, 1999.     

Piezoelectric Properties of 2D Nanoallotropes of Boron Nitride

Physics of the Solid State - The independent components of the tensor of piezoelectric moduli are calculated for various 2D&nbsp;nanoallotropes of boron nitride. The principle of the proposed...     

Photoelastic properties of graphenes

The components of the elastooptic tensor of graphenes with the sp ² hybridization of atomic orbitals for the visible and near infrared spectral regions are calculated. These components are shown to be comparable with those of lithium niobate.

     

Flexural waves in graphene and 2D supracrystals

A method has been proposed for the calculation of the phase and group velocities of flexural waves in one-atom-thick graphene-like structures. The method is based on the expression for the flexural modulus in terms of the two-dimensional Young??s modulus. The method is also applicable to studying the characteristics of swelling waves in single-walled nanotubes of a sufficiently large diameter.     

Young’s modulus and the Poisson’s ratio of planar and nanotubular supracrystalline structures

A method has been proposed for calculating the two-dimensional Young??s modulus and the Poisson??s ratio for planar and nanotubular structures through the components of the two-dimensional elastic rigidity tensor obtained by numerical methods. The method has been tested for graphene and two-dimensional supracrystalline sheets.     

Self-organized critical gating of ion channels: on the origin of long-term memory in dwell time series

We present the model of an ion channel, operating in a regime of self-organized criticality. It is suggested that complex cooperative dynamics takes place in the protein and the overall tension of it facilitates an open or closed state of the rigid gates in the pore-making domain. For the first time multifractal spectra of ion channel dynamics are presented. Our model well reproduces the multifractal properties of ion channel dwell time series and provides an insight on the origin of the long-term correlations in these series.     

Propagation of electromagnetic waves in conducting graphene-like carbon nanoallotropes

Propagation of electromagnetic waves in graphene-like conducting carbon crystals with the (C)_4ν and (C)_6ν symmetries is studied. It is demonstrated that only TM waves can exist in such crystals. The comparative analysis of such waves in different structures is performed. It is shown that the structures under study are superior to classical graphene with respect to excitation of electromagnetic waves.