Two-step percolation in aggregating systems

The two-step percolation behavior in aggregating systems was studied both experimentally and by means of Monte Carlo (MC) simulations. In experimental studies, the electrical conductivity, $\sigma$, of colloidal suspension of multiwalled carbon nanotubes (CNTs) in decane was measured. The suspension was submitted to mechanical de-liquoring in a planar filtration-compression conductometric cell. During de-liquoring, the distance between the measuring electrodes continuously decreased and the CNT volume fraction $\varphi$ continuously increased (from $10^{-3}$ up to $\approx 0.3$% v/v). The two percolation thresholds at $\varphi_{1}\lesssim 10^{-3}$ and $\varphi_{2}\approx 10^{-2}$ can reflect the interpenetration of loose CNT aggregates and percolation across the compact conducting aggregates, respectively. The MC computational model accounted for the core-shell structure of conducting particles or their aggregates, the tendency of a particle for aggregation, the formation of solvation shells, and the elongated geometry of the conductometric cell. The MC studies revealed two smoothed percolation transitions in $\sigma(\varphi)$ dependencies that correspond to the percolation through the shells and cores, respectively. The data demonstrated a noticeable impact of particle aggregation on anisotropy in electrical conductivity $\sigma(\varphi)$ measured along different directions in the conductometric cell.Comment: 10 pages, 6 figure

Saturation effect for dependence of the electrical conductivity of planar oriented nematic liquid crystal 6CB on the concentration of Cu7PS6 nanoparticles

The influence of Cu7PS6 nanoparticles with the average size 117 nm on the dielectric properties of planar oriented nematic liquid crystal 6CB has been investigated within the frequency range 10(1) ...10(6) Hz and at the temperature 293 K. It has been shown that when changing the concentration of nanoparticles within the range 0 to 1 wt.%, the conductivity of the liquid crystal changes stronger than its dielectric permittivity. It has been shown that the electrical conductivity increases monotonously with increasing the concentration of nanoparticles. However, for this dependence a saturation effect is observed. The mechanism of this effect was proposed.info:eu-repo/semantics/publishedVersio

Спілкування як один з основних факторів становлення іншомовної комунікативної культури особистості (Communication as one of the main factors of foreign communicative culture of identity formation)

В даній статті автор досліджує взаємозв’язок спілкування та іншомовної комунікативної культури та доводить, що спілкування являється провідним фактором для забезпечення виникнення, розвитку та становлення іншомовної комунікативної культури особистості(In this article the author examines the interconnection of communication and foreign language communicative culture and proves that communication is the main factor for the emergence, development and establishment of foreign language communicativ culture

Чеховські мотиви у творчості С. Д. Крижановського (Чеховские мотивы в творчестве С. Д. Кржижановского) (Chekhov’s motifs in S. D. Krzhizhanovsky’s works)

У статті представлено аналіз новелістиці С. Д. Кржижановського з точки зору продовження та переломлення чеховської традиції. Зокрема розглядаються мотиви: безнадійність, замкнений простір, одноманітність (повто- рюваність), даремність людського існування, потрясіння, нереалізованість бажаного та ін. Зіставляються також тип персонажа та мотивні структури обох письменників. (В статье представлен анализ новеллистики С. Д. Кржижановского с точки зрения продления и преломления чеховской традиции. В частности, рассматриваются мотивы: безнадежности, замкнутого пространства, однообразия (повторяемости), бесполезности человеческого существования, потрясения, нереализованности желаемого и др. Сопоставляются также тип персонажа и мотивные структуры обоих писателей.) (The creative principles and techniques of Anton Chekhov are attractive to modern writers. Chekhov’s works present serious psychological issues and world-view questions, among them: hopelessness, dreaminess, reticence, unrealized desirable purposes, foolish human, ordinary person. His works have inspired many foreign (George Bernard Shaw, Ernest Hemingway, Virginia Woolf and others) and Russian (Vladimir Tendryakov, Sasha Sokolov, Victor Pelevin and others) authors. S. D. Krzhizhanovsky (the Russian modernist) used the Chekhov’s motifs in his works too. For example Krzhizhanovsky’s character-dreamer (who often speaks about stars like Chekhov’s character) little by little turns into average man («Square of Pegasus»). The main Chekhov’s motif in the story «The Man in a Case» goes through different Krzhizhanovsky’s short stories («Quadraturin», «Square of Pegasus», «The Lost Player») expressed by the words: box, matchbox, sun blind, square, rectangle, to close, to shut, door bolt and others. Motif of continuity monotony of life are presented in some Krzhizhanovsky’s short stories: «Square of Pegasus», «Runaway Fingers».