Reactivity of the Blood Microcirculation System in Primary School Children to the Temperature Factor

The purpose of the study was to investigate the adaptive capacity of the blood microcirculation system in children of primary school age for a functional test with heating. The article deals with the study of the blood microcirculation system in primary school children by laser Doppler flowmetry and the study of the reserve capacity of tissue blood flow in children on a test with increasing temperature factor. Materials and methods. The research was conducted on the basis of the laboratory of physiological research of the Department of Anatomy and Physiology of People and Animals of Bohdan Khmelnytsky Melitopol State Pedagogical University. The surveyed contingent consisted of 80 practically healthy children aged 6 to 9 years old, secondary school students in Melitopol. Based on a comprehensive morphofunctional study, we obtained data on individual-typological features of blood microcirculation in primary school children and the reserve capacity of tissue blood flow using functional tests. It is established that the adaptive features of the blood microcirculation system in boys and girls of early school age are due to different levels of local and central mechanisms of microvessel regulation. Results and discussion. The results obtained during the thermal test indicate different levels of reactivity of the body to increasing the temperature factor and the neurogenic vasoconstrictor effects of the sympathetic nervous system on the vessels of the arteriolar part of the microcirculatory tract. The reaction to the thermal test directly depends on the individual-typological features of blood microcirculation. Conclusion. At a ratio of reaction to thermal influence in children with various types of microcirculation, the maximum increase in tissue perfusion was observed in children with type III of laser Doppler flowgram. This level of microvascular reactivity, as well as the relatively rapid recovery of blood flow after thermal hyperemia is explained by the fact that children with hyperemic type of microcirculation have increased microvascular tone due to neurogenic effects of the sympathetic chain of tissue blood flow regulation. Children with the hypoemic type of microcirculation, on the other hand, have a somewhat reduced sympathetic tone relative to the normoemic type, as a result of which the reserve of capillary blood flow is reduced and the time of blood flow recovery after thermal exposure is prolonged

Thermoelectric Elements with Negative Temperature Factor of Resistance

The method of manufacturing of ceramic materials on the basis of ferrites of nickel and cobalt by synthesis and sintering in controllable regenerative atmosphere is presented. As the generator of regenerative atmosphere the method of conversion of carbonic gas is offered. Calculation of regenerative atmosphere for simultaneous sintering of ceramic ferrites of nickel and cobalt is carried out. It is offered, methods of the dilated nonequilibrium thermodynamics to view process of distribution of a charge and heat along a thermoelement branch. The model of a thermoelement taking into account various relaxation times of a charge and warmth is constructed.

Designing Hydraulic Impact Devices for Low-Temperature Operation

The paper is devoted to the results of theoretical studying the hydraulic jackhammer operation under various temperature conditions and practical recommendations for their design and operation, considering the temperature factor.

Качество мужского гаметофита гибридов томата в условиях повышенной температуры

The aim of the research was to study the effect of high temperature on the variability of male gametophyte traits in hybrid F5 populations of tomato. Thus, it was found that the high temperature has a significant effect on the variability of the male gametophyte characteristics of tomato hybrids. For the combinations under study, it was revealed that the temperature factor and genotype are the main sources of variability of the male gametophyte traits against the background of elevated temperature. As a result of the experiments, the two most heat-resistant tomato genotypes were identified.

On the Dependence of the Fill Factor of the Solar Module on the Temperature

The work is devoted to the conversion and use of solar energy in solar panels. The article shows that one of the clue parameters for evaluating the efficiency of solar panels and photovoltaic cells, the fill factor decreases with increasing temperature. The issue of reducing the influence of the temperature factor on the efficiency of solar panels is also considered. Based on the research, the conclusion is given that the idling voltage should be as high as possible.

STUDYING THE INFLUENCE OF THE TEMPERATURE ON MORPHOLOGY OF CONGLOMERATES FROM COPPER NANOPARTICLES OBTAINED BY ELECTROEROSION DISPERSION

Aim. To obtain conglomerates from copper nanoparticles by the method of electroerosive dispersion in various liquid media (in 1% starch solution, ethanol, acetone, kerosene, petroleum ether) at two different temperatures (negative and room). Assessment of the influence of this factor on the size and shape of the resulting conglomerates. Methods. Methods based on visual observation of the obtained particles using a digital microscope at a magnification of 600x. Results. The results are presented in the form of micrographs of the obtained particles. Conclusions. Conclusions are drawn on the study of the influence of the temperature factor on the morphology (size, shape and ordering) of the resulting conglomerates.

Implications of Fagopyrin Formation In Vitro by UV Spectroscopic Analysis

The present work aims at studying the possible biosynthesis of fagopyrin in buckwheat plants with an attempt to address the existing gaps. The developed method of differential spectrophotometry can be used for identification of naphthodianthrones fagopyrins. It was found that in the vegetative mass of buckwheat plants, fagopyrin precursor-2-(piperidine-2-yl)-emodindianthron could be present. As fagopyrin can be produced by light effect, the temperature factor may influence the formation of protofagopyrin in vitro. An optimum temperature range was estimated for protofagopyrin formation. A possible fagopyrin biosynthesis under in vitro conditions was suggested.

Considering the temperature factor of hardening concrete in the construction of transport infrastructure facilities

Currently, there is a significant increase in personal and commercial road transport in the Russian Federation, which is why the issue of building new roads, bridges, tunnels, and other crossings is becoming more acute. Since often during the construction of these facilities, one of the main tasks is to minimize the construction period of the object, the process of intensifying production processes comes first. Based on the fact that the absolute leader in the use of reinforced concrete as the main building material, it is important and necessary to observe all the quality characteristics of this material both at the stage of laying the concrete mixture in the formwork, and in the process of maintaining the hardening concrete until the termination of heat-and-humidity care for it. In this regard, in order to optimize the temperature factor of hardening concrete in the construction of transport infrastructure facilities, it is necessary to provide measures at the design stage to consider the influence of the temperature gradient of hardening concrete on the operational properties of building structures. The article presents the main methods for considering the temperature factor of the hardening concrete of the constructed structures, developed by the authors of the work, the use of which will ensure the defect-free concreting of objects, including in an accelerated time.