Ion condensation on charged patterned surfaces

We study ion condensation onto a patterned surface of alternating charges. The competition between self-energy and ion-surface interactions leads to the formation of ionic crystalline structures at low temperatures. We consider different arrangements of underlying ionic crystals, including single ion adsorption, as well as the formation of dipoles at the interface between charged domains. Molecular dynamic simulation illustrates existence of single and mixed phases. Our results contribute to understanding pattern recognition, and molecular separation and synthesis near patterned surfaces.Comment: 3 figure

Electrical Switching in Thin Film Structures Based on Transition Metal Oxides

Electrical switching, manifesting itself in the nonlinear current-voltage characteristics with S- and N-type NDR (negative differential resistance), is inherent in a variety of materials, in particular, transition metal oxides. Although this phenomenon has been known for a long time, recent suggestions to use oxide-based switching elements as neuristor synapses and relaxation-oscillation circuit components have resumed the interest in this area. In the present review, we describe the experimental facts and theoretical models, mainly on the basis of the Mott transition in vanadium dioxide as a model object, of the switching effect with special emphasis on the emerging applied potentialities for oxide electronics

Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films

Striking features have been found in the nonlinear microwave (8 GHz) surface impedance $Z_s=R_s + jX_s$ of high-quality YBaCuO thin films with comparable low power characteristics [$R_{res}\sim 35--60 \mu\Omega$ and $\lambda_L(15 K)\sim 130--260 nm$]. The surface resistance $R_s$ is found to increase, decrease, or remain independent of the microwave field $H_{rf}$ (up to 60 mT) at different temperatures and for different samples. However, the surface reactance $X_s$ always follows the same functional form. Mechanisms which may be responsible for the observed variations in $R_s$ and $X_s$ are briefly discussed.Comment: 4 pages, 4 figure

Non-linear Microwave Surface Impedance of Epitaxial HTS Thin Films in Low DC Magnetic Fields

We have carried out non-linear microwave (8 GHz) surface impedance measurements of three YBaCuO thin films in dc magnetic fields $H_{dc}$ (parallel to c axis) up to 12 mT using a coplanar resonator technique. In zero dc field the three films, deposited by the same method, show a spread of low-power residual surface resistance, $R_{res}$ and penetration depth, $\lambda$ (T=15 K) within a factor of 1.9. However, they exhibit dramatically different microwave field, $H_{rf}$ dependences of the surface resistance, $R_s$, but universal $X_s(H_{rf})$ dependence. Application of a dc field was found to affect not only absolute values of $R_s$ and $X_s$, but the functional dependences $R_s(H_{rf})$ and $X_s(H_{rf})$ as well. For some of the samples the dc field was found to decrease $R_s$ below its zero-field low-power value.Comment: 4 pages, 4 figures. To be published in IEEE Trans. Appl. Supercond., June 199

Tunable coaxial cavity resonator for linear and nonlinear microwave characterization of superconducting wires

We discuss experimental results obtained using a tunable cylindrical coaxial cavity constituted by an outer Cu cylinder and an inner Pb-BSCCO wire. We have used this device for investigating the microwave response of the superconducting wire, both in the linear and nonlinear regimes. In particular, by tuning the different modes of the cavity to make them resonant at exactly harmonic frequencies, we have detected the power emitted by the superconducting inner wire at the second- and third-harmonic frequency of the driving field. The results obtained in the nonlinear regime, whether for the microwave surface impedance or the harmonic emission, are qualitatively accounted for considering intergrain fluxon dynamics. The use of this kind of device can be of strong interest to investigate and characterise wires of large dimensions to be used for implementing superconducting-based microwave devices.Comment: 14 pages, 6 embedded figures, accepted for publication in Supercond. Sci. Techno

Оценка состояния питания и пищевого статуса детей раннего возраста южного региона = Assessment of the nutrition status of infants in South region

Velichko V. I., Danilchuk G. A., Kolotvin L. I., Chernetskaya A. V. Оценка состояния питания и пищевого статуса детей раннего возраста южного региона = Assessment of the nutrition status of infants in South region. Journal of Education, Health and Sport. 2016;6(11):548-556. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.192832http://ojs.ukw.edu.pl/index.php/johs/article/view/4042    The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 755 (23.12.2015).755 Journal of Education, Health and Sport eISSN 2391-8306 7© The Author (s) 2016;This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, PolandOpen Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium,provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License(http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercialuse, distribution and reproduction in any medium, provided the work is properly cited.The authors declare that there is no conflict of interests regarding the publication of this paper.Received: 02.11.2016. Revised 22.11.2016. Accepted: 30.11.2016. ОЦЕНКА СОСТОЯНИЯ ПИТАНИЯ И ПИЩЕВОГО СТАТУСА ДЕТЕЙ РАННЕГО ВОЗРАСТА ЮЖНОГО РЕГИОНА В. И. Величко, Г. А. Данильчук, Л. И. Колотвина, А. В. Чернецкая  Одесский национальный медицинский университет Резюме. Актуальность. Разбалансированное питание в раннем детском возрасте нередко приводит к нарушению состояния здоровья ребенка, в том числе к задержке психического развития, нарушению механизмов адаптации и снижению иммунологической защиты. Изучение и оценка фактического питания детей раннего возраста и его влияния на здоровье и развитие младенцев позволит разработать необходимые рекомендации как для родителей, так и для врачей. Цель исследования: изучить распространенность грудного вскармливания среди детей грудного возраста, проживающих в южных регионах Украины (Одесской, Николаевской и Херсонской областях). Результаты. Проведен комплексный анализ фактического питания детей раннего возраста, получены данные о сроках прикладывания ребенка к груди и докармливании смесями в роддоме, продолжительности грудного вскармливания, частоте включения в питание кормящей матери и ребенка цельного коровьего молока и молочных продуктов. Выводы. Установлено, что распространенность грудного вскармливания остается недостаточной, отмечается недостаточная осведомленность женщин о принципах грудного вскармливания, 33,8% детей докармливаются смесью в родильном доме.Ключевые слова: дети в возрасте 0-12 мес, фактическое питание, режим питания, продолжительность грудного вскармливания.  ASSESSMENT OF THE NUTRITION STATUS OF INFANTS INSOUTH REGION V. I. Velichko, G. A. Danilchuk, L. I. Kolotvin, A. V. Chernetskaya  Odessa National Medical UniversityAbstractRelevance. Unbalanced nutrition in early childhood often leads to disruption of the state of children's health, including mental retardation, disturbance of the mechanisms of adaptation and reduction of immunological protection. The study and evaluation of actual nutrition of infants and its impact on the health and development of infants will develop the necessary guidance for parents and for doctors. Objective: to study the prevalence of breastfeeding among infants living in the southern regions of Ukraine (Odessa, Nikolaev and Kherson regions). Results. The complex analysis of actual nutrition of young children, the data on the timing of applying the child to her breast and supplemental foods mixtures in hospital, duration of breastfeeding, the frequency of inclusion in the nutrition nursing mother and baby cow's milk and dairy products. Conclusions. It was found that the prevalence of breastfeeding is insufficient, there is a lack of awareness of the principles of women breastfeeding, 33.8% of children finish feeding mixture in the maternity hospital. Key words: children aged 0-12 months, the actual nutrition, diet, duration of breastfeeding