Doklady of the National Academy of Sciences of Belarus最新文献_第8页

Molecular nature of cytotoxicity of zinc oxide nanostructures 氧化锌纳米结构细胞毒性的分子性质

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-08-30 DOI: 10.29235/1561-8323-2020-64-4-448-456

Y. Harmaza, A. Tamashevski, E. Slobozhanina

引用次数: 1

Belarusian-Russian bilingualism is the historically spiritual and cultural value of the people 白俄双语是人民的历史精神和文化价值

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-08-30 DOI: 10.29235/1561-8323-2020-64-4-506-512

V. Gusakov, A. Kovalenya

引用次数: 1

A new approach to approximate solution of the Stefan problem with a convective boundary condition (Communicated by Corresponding Member Nikolai V. Pavlyukevich) 具有对流边界条件的Stefan问题近似解的一种新方法(通讯员Nikolai V. Pavlyukevich通讯)

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-08-30 DOI: 10.29235/1561-8323-2020-64-4-495-505

V. A. Kot

{"title":"A new approach to approximate solution of the Stefan problem with a convective boundary condition (Communicated by Corresponding Member Nikolai V. Pavlyukevich)","authors":"V. A. Kot","doi":"10.29235/1561-8323-2020-64-4-495-505","DOIUrl":"https://doi.org/10.29235/1561-8323-2020-64-4-495-505","url":null,"abstract":"Two new variants of approximate analytical solution of the one-phase Stefan problem with a convective boundary condition at a fixed boundary are proposed. These approaches are based on the use of new integral relations forming infinite sequences. It is shown that the most exact variant of solving the Stefan problem with a convective boundary condition is to refuse from the classical Stefan condition at the free boundary and to replace it with its integral relation. By the example of solving the test Stefan problem with a Robin boundary condition, having an exact analytical solution, it is shown that the proposed approach is much more exact and efficient compared to the known variants of the integral computational scheme, including the heat-balance integral method allowing the Stefan condition at the free boundary to be satisfied. The solutions obtained with the use of the square-law and cubic polynomials are presented. As for the test problem using the cubic polynomial, the relative error in determining the free boundary comprises hundredths and thousandths of percent. In this case, at the time instant t = 1, the relative error in determining the temperature profile is e T = 0.075 %.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79618021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Memristor structure with the effect of switching resistance based on silicon nitride thin layers 基于氮化硅薄层的开关电阻效应忆阻器结构

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-08-30 DOI: 10.29235/1561-8323-2020-64-4-403-410

F. Komarov, I. Romanov, L. Vlasukova, I. Parkhomenko, A. A. Tsivako, N. Kovalchuk

{"title":"Memristor structure with the effect of switching resistance based on silicon nitride thin layers","authors":"F. Komarov, I. Romanov, L. Vlasukova, I. Parkhomenko, A. A. Tsivako, N. Kovalchuk","doi":"10.29235/1561-8323-2020-64-4-403-410","DOIUrl":"https://doi.org/10.29235/1561-8323-2020-64-4-403-410","url":null,"abstract":"The electrophysical properties and the resistive switching effect of the ITO/SiNx/Si memristor structure were studied. A silicon nitride film with a thickness of ~200 nm with an inhomogeneous element depth distribution was deposited by low-pressure chemical vapor deposition. Based on the Rutherford backscattering data, it was shown that the concentration of excess silicon atoms in the SiNx film increases from 9 to 44 % when approaching the Si substrate. The analysis of the current-voltage characteristics of ITO/SiNx/Si structures revealed that the conduction mechanism in the high-resistance state is determined by the nitride film properties and is described by the Poole–Frenkel model taking into account the hopping model of electron transport between traps. Switching to the low-resistance state is probably caused by the migration of indium or tin ions from the ITO contact to the SiNx layer. The conduction of the ITO/SiNx/Si structure in the low-resistance state is determined by both the mechanisms of charge-carrier injection from the contact and charge-carrier transport through the dielectric layer. Reverse polarity results in destructing the conductive channel and switching the structure to the high-resistance state. The photo-switching effect was found for the ITO/SiNx/Si structure, which opens up new possibilities of using memristors in silicon optoelectronic systems.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84233545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features of the development of longwalls that extract the underworked sylvinite layer in the deep horizons of the Starobin potash salt deposit 在Starobin钾盐矿床的深层地层中，开采未开采钾盐层的长壁发育特征

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-08-30 DOI: 10.29235/1561-8323-2020-64-4-477-487

A. Petrovsky, V. Y. Prushak, D. Puzanov

{"title":"Features of the development of longwalls that extract the underworked sylvinite layer in the deep horizons of the Starobin potash salt deposit","authors":"A. Petrovsky, V. Y. Prushak, D. Puzanov","doi":"10.29235/1561-8323-2020-64-4-477-487","DOIUrl":"https://doi.org/10.29235/1561-8323-2020-64-4-477-487","url":null,"abstract":"A study was made of the features of rock pressure manifestation and the deformation nature of development and assembly workings depending on the binding of the roof and its location relative to the longwalls mined by the chamber system for layers 2, 2-3, 3, as well as of the panels mined by the chamber system in the extraction conditions of the worked out fourth sylvinite layer of the Third potash horizon at a depth of more than 600 m. It was established that the service life of newly designed workings depends on their location on the panel, the roof binding and fastening parameters. The longest service life of workings will be noted when they are located in the mined space above the mined longwalls along the lower layers, and the shortest service life will be marked when they are carried out in the central part of the safety intercolumn pillars. Based on the studies performed, the recommendations were made on the selection of locations, roof bindings and on the protection and maintenance of development workings for the sites of the mine fields of the JSC “Belaruskali” mines extracting the worked out fourth sylvinite layer at depths over 600 m. The developed recommendations are aimed at improving the work safety and efficiency when extracting abandoned mineral reserves. Using the study results, the project was developed to conduct development workings of a new panel of the longwall 11-5 that provides the necessary stability of workings for the entire period of winning operations and, ultimately, safe extraction of potash ore in the amount of at least 2 million tons.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89590668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Packing dimensions of basins in the space of sequences 层序空间中盆地的充填尺寸

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-07-09 DOI: 10.29235/1561-8323-2020-64-3-263-267

V. Bakhtin, B. Sadok

引用次数: 1

Acid-base properties of fibrous polyampholytes with aminodiacetic functional groups 含氨基二乙酸官能团纤维性多两性电解质的酸碱性质

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-07-09 DOI: 10.29235/1561-8323-2020-64-3-300-307

E. Kosandrovich, P. V. Nesteronok, L. N. Shachenkova, V. Soldatov

引用次数: 0

Swelling of polyacrylamide-based hydrogel in aqueous solutions of low-molecular salts 聚丙烯酰胺基水凝胶在低分子盐水溶液中的溶胀

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-07-09 DOI: 10.29235/1561-8323-2020-64-3-293-299

E. Vorobieva

引用次数: 3

On the kolmogorov system with fourth-degree homogeneous nonlinearities 关于四次齐次非线性kolmogorov系统

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-07-09 DOI: 10.29235/1561-8323-2020-64-3-268-272

A. P. Sadovskiĭ

引用次数: 0

On the significance of hyperlactatemia in the implementation of the infarct-limiting effect of remote ischemic postconditioning in myocardial ischemia-reperfusion in the experiment 本实验探讨高乳酸血症在心肌缺血再灌注中远程缺血后处理限制梗死作用实施中的意义

Doklady of the National Academy of Sciences of Belarus Pub Date : 2020-07-09 DOI: 10.29235/1561-8323-2020-64-3-332-340

S. N. Chepelev, F. Vismont, S. V. Goubkin

{"title":"On the significance of hyperlactatemia in the implementation of the infarct-limiting effect of remote ischemic postconditioning in myocardial ischemia-reperfusion in the experiment","authors":"S. N. Chepelev, F. Vismont, S. V. Goubkin","doi":"10.29235/1561-8323-2020-64-3-332-340","DOIUrl":"https://doi.org/10.29235/1561-8323-2020-64-3-332-340","url":null,"abstract":"Modern medicine faces the problem of the growth of cardiovascular pathology. Given the high medical and social significance of the problem of treating patients with coronary heart disease and acute myocardial infarction, the search for new effective methods to prevent or weaken ischemic myocardial damage and mechanisms for their implementation is an urgent task of modern experimental and clinical medicine. The aim of the study was to determine the significance of hyperlactatemia in the realization of the infarct-limiting effect of remote ischemic postconditioning (RIPostC) in rat myocardial ischemia-reperfusion in the experiment. The study revealed that after 15-minute RIPostC, which was performed 10 minutes after 30-minute acute myocardial ischemia followed by 120-minute reperfusion, the plasma lactate level in rats increased 1.87 times (87.7 %, p < 0.05) compared with intact animals. It was established that the introduction of L-lactate into the left common jugular vein at a dose of 10 μg/kg, which was carried out 25 minutes after the onset of reperfusion under the conditions of myocardial ischemia (30 minutes) and next reperfusion (120 minutes) and RIPostC (10 minutes after the onset of reperfusion), which was reproduced by ischemia of these limbs, have a heart attack-limiting effect. The increase of the level of blood lactate (hyperlactatemia) after RIPostC in myocardial ischemia-reperfusion is of significance in the implementation of its infarct-limiting effect.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84818044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3