Adhesive coatings based on aligned arrays of carbon nanostructures

This work was financially supported by Russian Foundation for Basic Research (projects 16-29-14023 and 18-32-00652) and Internal grant of the Southern Federal University (project VnGr-07/2017-26)

Study of the dependence of Young's modulus of vertically aligned carbon nanotubes on their aspect ratio

The reported study was funded by RFBR according to the research projects No.16-29-14023 ofi_m, No.18-32-00652 and by grant of the Southern Federal University (project No. VnGr-07/2017-26)

Investigation of the effect of upper electrode material on the memristor properties of strained carbon nanotubes

The reported study was funded by RFBR according to the research project No. 16-29-14023 ofi_m

Study of the electromechanical properties of aligned carbon nanotubes coated with ZnO using atomic force microscopy

The reported study was funded by RFBR according to the research projects No. 18-32-00652 mol_a, No.18-29-11019 mk and by grant of the Southern Federal University (project No. VnGr-07/2017-26)

Asymptotics of Eigenvalues and Eigenfunctions for the Laplace Operator in a Domain with Oscillating Boundary. Multiple Eigenvalue Case

We study the asymptotic behavior of the solutions of a spectral problem for the Laplacian in a domain with rapidly oscillating boundary. We consider the case where the eigenvalue of the limit problem is multiple. We construct the leading terms of the asymptotic expansions for the eigenelements and verify the asymptotics

Piezoelectric effect in non-uniform strained carbon nanotubes

Экспериментально установлено, что неравномерно деформированные углеродные нанотрубки (УНТ) обладают поверхностным потенциалом, значение которого зависит от величины деформации. Оценено значение пьезоэлектрического коэффициента УНТ, которое составило 0,107±0,032 Кл/м2.We have experimentally established that non-uniformly strained carbon nanotubes have a surface potential the value of which depends on the magnitude of the deformation. The value of the piezoelectric coefficient of car on nanotu es was estimated to e 0.107 ± 0.032 C/m2.Работа выполнена при финансовой поддержке РФФИ (проекты № 16-29-14023 офи_м и №16-37-00101 мол_а)

Prediction of inter-particle adhesion force from surface energy and surface roughness

Fine powder flow is a topic of great interest to industry, in particular for the pharmaceutical industry; a major concern being their poor flow behavior due to high cohesion. In this study, cohesion reduction, produced via surface modification, at the particle scale as well as bulk scale is addressed. The adhesion force model of Derjaguin-Muller-Toporov (DMT) was utilized to quantify the inter-particle adhesion force of both pure and surface modified fine aluminum powders (∼8 μm in size). Inverse Gas Chromatography was utilized for the determination of surface energy of the samples, and Atomic Force Microscopy was utilized to evaluate surface roughness of the powders. Surface modification of the original aluminum powders was done for the purpose of reduction in cohesiveness and improvement in flowability, employing either silane surface treatment or dry mechanical coating of nano-particles on the surface of original powders. For selected samples, the AFM was utilized for direct evaluation of the particle pull-off force. The results indicated that surface modification reduced the surface energy and altered the surface nano-roughness, resulting in drastic reduction of the inter-particle adhesion force. The particle bond number values were computed based on either the inter-particle adhesion force from the DMT model or the inter-particle pull-off force obtained from direct AFM measurements. Surface modification resulted in two to three fold reductions in the Bond number. In order to examine the influence of the particle scale property such as the Bond number on the bulk-scale flow characterization, Angle of Repose measurements were done and showed good qualitative agreements with the Bond number and acid/base surface characteristics of the powders. The results indicate a promising method that may be used to predict flow behavior of original (cohesive) and surface modified (previously cohesive) powders utilizing very small samples

Оценка физического развития и питания детей в возрасте 1–3 лет, проживающих в г. Москве

Irrational feeding can lead to a child’s physical and intellectual development disorders, a decrease in the body’s ability to resist aggressive environmental factors.Aim: to evaluate the physical development and nutrition of children aged 1–3 years living in Moscow.Methods: 106 children aged 1–3 years were examined: group 1 (n = 59) was comprised of children aged 1–2 years, group 2 — children aged 2–3 years (n = 47). Anthropometric data was evaluated using AntroPlus (WHO software). The following Z-score figures were calculated: WAZ (body mass for age), HAZ (height for age) and BAZ (body mass index for age). Nutrition was evaluated by reproducing a 3-day food allowance (actual nutrition) using the Dietplan 6 software. Figures analyzed: the volume of consumed food, daily caloricity, the amount of consumed proteins, fats and carbohydrates.Results: for the majority (76.4%) of examined children BAZ was between -2 and +1. 20% of children had an excessive body mass and obesity (BAZ > 1). Children with an excessive body mass demonstrated exceeding volumes of food consumption (by about 200–300g. per day, p < 0.001), protein consumption by 47.5%, fat consumption — 36.7% and caloricity by 21.3% (p < 0.001) as compared with the recommended consumption norms.Conclusion: the revealed nutrition disorders in children aged 1–3 years (overeating and unbalanced diet) lead to an increased body mass and obesity. Children with high body mass indexes at birth and Z-score and BAZ at the time of the study can be attributed to the obesity risk group. The BAZ index is the most informative one in terms of evaluating the child’s nutritive status.Нерациональное питание может привести к нарушениям физического и интеллектуального развития ребенка, снижению сопротивляемости организма к агрессивным факторам внешней среды.Цель исследования: оценить физическое развитие и питание детей в возрасте 1–3 лет, проживающих в г. Москве.Методы: обследовано 106 детей в возрасте от 1 до 3 лет: I группу (n = 59) составили дети 1–2 лет, II группу — дети 2–3 лет (n = 47). Антропометрические данные оценивались с использованием программы WHO AnthroPlus: расчитывались показатели Z-score — массы тела для возраста (WAZ), длины тела для возраста (HAZ), а также индекс массы тела/возраст (BAZ). Оценка питания проводилась методом воспроизведения 3-дневного рациона (фактического питания) с использованием программы Dietplan 6. Анализировались объем съеденной пищи, суточная калорийность питания, количество потребляемых белков, жиров, углеводов.Результаты: для большинства (76,4%) обследованных детей были характерны средневозрастные показатели физического развития и нутритивного статуса (BAZ от -2 до +1). У 1/5 детей были выявлены избыточная масса тела и ожирение (BAZ > 1). При избыточной массе тела, особенно у детей 1–2 лет, было установлено превышение потребляемых объемов пищи на 200–300 г/сут, белка — на 47,5%, жира — на 36,7% и энергетической ценности — на 21,3% (p < 0,001) по сравнению с рекомендуемыми нормами потребления.Заключение: выявленные нарушения питания у детей в возрасте 1–3 лет (переедание и разбалансированный рацион) приводят к развитию у них избыточной массы тела вплоть до ожирения. Детей с высокими показателями веса при рождении и Z-score BAZ на момент исследования можно отнести к группе риска по развитию ожирения. Наиболее информативным для оценки нутритивного статуса ребенка является показатель BAZ