Fabrication of probes for scanning near-field optical microscopy using focused ion beam

The results were obtained using the infrastructure of the Center for Shared Use “Nanotechnology” of the Southern Federal University

Effect of thermomechanical impacts on the deformation of thin polyimide films at uniaxial tension

Thermomechanical studies of the dependence of deformation on time (t) and temperature (T) for various static stresses in polyimide under uniaxial tension were carried out. Temporal deformation curves for static stresses in the range from 75 to 110 MPa consist of two stages: 1 - increase; 2 - exit to saturation, which is associated with a change in the nature of structural transformations of macromolecules, due to the action of the static stresses. An increase in temperature and voltage leads to an increase in the dependence e (Т). This is due to the intensification of the processes of structuring macromolecules with increasing temperature and are supplemented by processes of breaking bonds between macromolecules, which increase the strain rate. Experimental data are described in terms of exponential and linear models

Kinetic parameters of the uranium luminescence in Lif crystals

The results of researches with nanosecond time resolution of kinetic characteristics of luminescence buildup and decay in crystals LiF(U)-O at 300 K under action of both laser pulse with energy 3,68 eV and electron pulse with energy 300 keV have been presented. Influence of excite method on kinetic characteristics of uranium luminescence buildup and influence of uranium on kinetic characteristics of oxygen luminescence in crystal were establishe

Mineralogical and geochemical features of the Manus Basin hydrothermal sulfide ores, Bismarck Sea

Paragenetic mineral assemblages have been established based on mineralogical, chemical, and isotope (S, Pb) studies, and the sequence of deposition has been defined in hydrothennal sulfide structures in a typical back-arc basin. The ores in the Manus basin have a prominent Zn specialization (sphalerite, würtzite, and fe-sphalerite). An association of Fe-spbalerite and galena with Ag sulfosalts is noted that is not characteristic of typical midocean ridge hydrothennal systems. The average 34S in the sulfide minerals is 3.5%o, which corresponds to the medium-temperature sphalerite stage in hydrothermal mineral fonnation. It is suggested that the metal source is located in the relatively acid rocks of the island-arc tholeiitic series and possibly in sediments

Investigation of Mechanical Properties of Polyimide- Polyethyl-eneterephthalate System

The study of the physico-mechanical properties of new composite materials based on polyimide (PI) and polyethyleneterephthalate (PET) was carried out. Dependences of σ from ε for different concentrations of the second component and irradiation doses were measured. The experimental data are described satisfactorily by the exponential cascadeprobabilistic model

Stone Age Research in the Narva–Luga Klint Bay Area in 2005–2014

The Narva–Luga micro-region, situated on the border of Estonia and Russia in north-eastern Europe, has been the target of international and interdisciplinary research conducted annually between 2005 and 2014. During this time, altogether 42 new archaeological sites have been discovered, and many sites have also been excavated – in addition, a large amount of natural scientific data has been collected. All in all, over 60 Stone Age and Bronze Age sites are currently known in this micro-region. The sites date mostly between the late 6th and late 3rd millennia calBC, that is, to the cultural contexts of Narva Ware, Comb Ware, and Corded Ware. In this paper, some of the main results of the archaeological studies made during the last decade are briefly summarised

Study of deformation dependence on time in polyethylene terephthalate for different static loads and irradiation doses

Complex experiments were conducted on deformation dependence on time for different static loads and irradiation doses in polyethylene terephthalate. Curves of time (t) dependence of deformation (?) show a significant change in the behavior of the material after irradiation. The obtained dependence curves of on t for both non-irradiated and irradiated materials are satisfactorily described by cascade-probability model

Novel technology for fabrication of probe tips for SPM using focused ion beam induced deposition method

The work was done through a grant from the Russian Science Foundation (project No. 18-79-00175) using the equipment of the Research and Education Center and the Nanotechnology Joint Use Center of the Southern Federal University (Taganrog)

Study of the influence of the electron irradiation dose on the deformation of Mylar films taking into account the processes of destruction and crosslinking

Experimental studies of the dependence of the deformation [epsilon] on the dose of electron irradiation D taking into account the processes of destruction and crosslinking for films of the Mylar type have been carried out. It was obtained that the dependence of [epsilon] on D for the process of cross-linking is described by a linear and destruction by an exponential function

Бронхофонография в комплексной диагностике бронхиальной астмы у детей

Bronchophonography (BPG) is a functional diagnostic method for the breathing pattern assessment. It is based on an analysis of frequency-peak parameters of the breathing sound spectrum. The method allows to fix a temporary acoustic curve arising during the respiration with the subsequent mathematical processing of the data. The breathing sound fluctuation amplitude ranges within 0-12.4 kHz that permits to calculate an acoustic breathing work equivalent the lung work aimed to the breathing. Hardware-software complex displays the fixed breathing sounds and evaluates their parameters not revealed during the physical examination. The highfrequency range (5.0-12.4 kHz) corresponds to wheezing.We examined 76 bronchial asthmatic children aged from 1 to 14 years. The control group involved 48 children with no lung pathology. The examination included clinical, spirography and BPG testing.The BPG method contributes to the routine lung functional testing and allows evaluating the bronchial asthma severity in children.Бронхофонография — метод оценки дыхательного паттерна. Данный метод основывается на анализе амплитудно-частотных характеристик спектра дыхательных шумов. Метод позволяет зафиксировать временную кривую акустического шума, возникающего при дыхании, с последующей математической обработкой. Частота колебаний дыхательных шумов определяется в пределах от 0 до 12,4 кГц с последующим расчетом "акустической" работы дыхания как эквивалента работы легких, затрачиваемой на совершение акта дыхания. Компьютерный комплекс позволяет отображать фиксируемые дыхательные шумы на экране монитора, а также объективно оценивать характеристики дыхательных шумов, которые не выявляются при физикальном обследовании. Зона высоких частот (выше 5 кГц) коррелирует со звуковыми характеристиками сухих хрипов.Было обследовано 76 детей с бронхиальной астмой в возрасте от 1 года до 14 лет. Контрольная группа включала 48 детей без патологии легких. Проводились клиническое обследование и запись данных методом бронхофонографии и спирографии (пневмотахометрии).Метод бронхофонографии позволяет расширить функциональную оценку легких, получаемую рутинными методами обследования, а также точно оценить тяжесть течения бронхиальной астмы