Doklady Akademii nauk最新文献

Features of transformation of soil properties of the arable land in Belarus 白俄罗斯可耕地土壤性质变化的特征

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-247-256

V. Lapa, T. N. Azarenok

引用次数: 0

Processes of electroluminescence degradation of light-emitting structures based on thin silicon oxide and nitride films 基于氧化硅和氮化硅薄膜的发光结构的电致发光降解过程

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-158-167

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

{"title":"Processes of electroluminescence degradation of light-emitting structures based on thin silicon oxide and nitride films","authors":"I. Romanov, F. Komarov, L. Vlasukova, I. Parkhomenko, N. Kovalchuk","doi":"10.29235/1561-8323-2021-65-2-158-167","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-158-167","url":null,"abstract":". SiO 2 /Si, SiN 1.2 /SiO 2 /Si and SiO 2 /SiN 0.9 /SiO 2 /Si structures have been fabricated by chemical vapor deposition and thermal oxidation of silicon. The elemental composition and thicknesses of dielectric layers have been studied using Rutherford backscattering spectroscopy, scanning electron microscopy, and spectral ellipsometry. The electroluminescence (EL) of the samples has been investigated in the “electrolyte–dielectric–semiconductor” system at a positive bias voltage applied to the silicon substrate. An intense band with maxima at 1.9 eV appears on the EL spectra of the SiO 2 /Si sample, while the EL spectra of the SiN 1.2 /SiO 2 /Si and SiO 2 /SiN 0.9 /SiO 2 /Si samples are characterized by the presence of bands with the maximum values of 1.9, 2.3 and 2.7 eV. The nature of these bands is discussed. Passing a charge in the range of 100–500 mC/ cm 2 through the SiO 2 /SiN 0.9 /SiO 2 /Si sample, an increase in the EL intensity was recorded in the entire visible range. Passing a charge of 1 C/cm 2 through a sample with a three-layer dielectric film resulted in the EL intensity decrease. It can be explained by the upper oxide layer degradation. It has been shown that silicon nitride deposited on top of the SiO 2 layer protects the oxide layer from field degradation and premature breakdown. The most stable electroluminescence when exposed to a strong electric field is observed for the structure SiN 1.2 /SiO 2 /Si.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"18 1","pages":"158-167"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82494289","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

Complex character of the influence of polycarboxylic and phosphonic acids on the crystallization of calcium and magnesium salts in dynamic conditions 动态条件下多羧酸和膦酸对钙镁盐结晶影响的复杂特性

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-168-177

E. Vorobieva, A. Vorobiev, I. V. Shestak, D. V. Cherednichenko, S. V. Bucha

{"title":"Complex character of the influence of polycarboxylic and phosphonic acids on the crystallization of calcium and magnesium salts in dynamic conditions","authors":"E. Vorobieva, A. Vorobiev, I. V. Shestak, D. V. Cherednichenko, S. V. Bucha","doi":"10.29235/1561-8323-2021-65-2-168-177","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-168-177","url":null,"abstract":". The influence of water-soluble organic compounds (adipic, polyaspartic and phosphonic acids) and their compositions on the crystallization of calcium and magnesium salts in dynamic conditions has been studied. It is found that the induction period of phase formation increases in the presence of polyaspartic and phosphonic acids 2.3–5.2 times in the range of their content from 0.05 to 0.2 ppm. The results of XRD and electron microscopic studies confirm the change in the phase composition and morphology of the crystalline precipitate that is formed. The dibasic carboxylic acid influence on the induction period, composition and structure of the precipitate is much less. It is established that the composition of organic acids also increases the induction period of phase formation. The complex inhibitor provides an increase in the critical supersaturation level in the system. The phosphonic and carboxyl groups of the inhibitor interact with calcium and magnesium ions and block the crystallization nuclei. When interacting with the dicarboxylic acid and polyacid adsorption on the surface of the formed crystals, the microcrystals dissolve.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"16 1","pages":"168-177"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81087914","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

Genetic analysis of the human remains of the burials of the 17th–18th centuries of the Corpus Christi Church in Nesvizh (Belarus) 涅斯维日(白俄罗斯)科珀斯基督教堂17 - 18世纪墓葬中人类遗骸的基因分析

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-199-206

M. Shapturenko, A. V. Lugovnjov, S. Borovko, M. Pamazanau, S. Vakula, A. Kilchevsky

{"title":"Genetic analysis of the human remains of the burials of the 17th–18th centuries of the Corpus Christi Church in Nesvizh (Belarus)","authors":"M. Shapturenko, A. V. Lugovnjov, S. Borovko, M. Pamazanau, S. Vakula, A. Kilchevsky","doi":"10.29235/1561-8323-2021-65-2-199-206","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-199-206","url":null,"abstract":"During archaeological excavation in the territory of the Corpus Christi Church in Nesvizh, the regular burials dated to the 17th–18th centuries were discovered. The genetic material extracted from the bones of seven unidentified individuals was analyzed using the forensic genetics approaches, including STR profiling and DNA phenotyping. The genetic examination revealed that the remains of three samples (#1, #2, #6) belonged to women, and the four others (#3, #4, #5, and #7) belonged to men. Autosomal STR-data and Y-chromosomal profiles were obtained for five samples. The kinship analysis excluded that woman #1 and men #3, #4, #5, #7 were first-degree relatives. According to the Y-STR profiles, men #3, #4, #7 referred to the haplogroup R1a, the haplotype of individual #5 corresponded to I2. The both haplogroups are widely represented in Eastern Europe, which, with a high degree of probability, suggests the Slavic origin of the individuals under investigation. To predict eye and hair color, we used the HIrisPlex DNA phenotyping system. The analysis gave the satisfactory results for woman #1 and man #7. In correspondence to the allelic variants of the 24 SNP system, woman #1 had an intermediate type of iris pigmentation and dark blond hair (p = 0.635) with dark shade (0.639), light skin tone, low tendency to sunburn, and a high probability of freckles and pigmented spots of the skin. For male #7, the HIrisPlex model predicted blue eye color with a high probability (p = 0.915), as well as blond hair color (p = 0.915) and light hair color shade (p = 0.962). Our data allow us to conclude that the unknown individuals under investigation have significant genetical and phenotypical similarity with the modern Belarusian population.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"12 1","pages":"199-206"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87495734","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

Classical solution of the ﬁrst mixed problem for the wave equation in the cylyndrical domain 圆柱域波动方程第一混合问题的经典解

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-135-138

V. Korzyuk, I. I. Stolyarchuk

引用次数: 1

Дираковская частица во внешнем кулоновском поле на фоне пространств Лобачевского–Римана

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-146-157

Е. М. Овсиюк, А. Д. Коральков

引用次数: 0

New data on the chemical composition of the non-ferrous metal products of the X–XVIII centuries on the territory of Northern and Central Belarus 关于白俄罗斯北部和中部地区x - 18世纪有色金属产品化学成分的新数据

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-241-246

И. В. Магалинский

{"title":"New data on the chemical composition of the non-ferrous metal products of the X–XVIII centuries on the territory of Northern and Central Belarus","authors":"И. В. Магалинский","doi":"10.29235/1561-8323-2021-65-2-241-246","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-241-246","url":null,"abstract":"The article presents the results of analysis of new data on the elemental composition of non-ferrous metal products on the territory of certain archaeological sites in Northern and Central Belarus. The author distinguishes two main stages in the non-ferrous metalworking of the region: the X–XIII centuries and XIV–XVIII centuries. It is noted that the period of the X–XIII centuries is characterized by a significant predominance of copper-zinc alloys with average and high concentrations of zinc in metal. Meanwhile, bronze alloys also play an important role, accounting for 35 % of the total number of the items studied. Samples made of copper-zinc and bronze alloys are also characterized by a significant amount of lead. As a result of the analysis of the data on the elemental composition of non-ferrous metal products of the XIV–XVIII centuries, it is concluded that non-ferrous metalworking of this period is characterized by the continuity of traditions with handicraft production of the previous period, which manifested itself in the widespread use of copper-zinc alloys, as well as of tin-lead and multicomponent bronzes. At the same time, a significant difference is the increase in the proportion of alloys with high concentrations of alloying components.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"116 1","pages":"241-246"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87795858","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

Synthesis, structure and morphology of composites based on magnesium ferrite and carbon nitride 铁素体镁与氮化碳复合材料的合成、结构与形貌

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-178-184

A. Ivanets

引用次数: 1

Construction of the recombinant Escherichia coli strain producing a homologous thermolabile toxin subunit 产生同源耐热毒素亚基的重组大肠杆菌菌株的构建

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-185-190

I. Kazlouski, A. Zinchenko, A. Solovyeva, O. N. Novikova, Y. Lomako

{"title":"Construction of the recombinant Escherichia coli strain producing a homologous thermolabile toxin subunit","authors":"I. Kazlouski, A. Zinchenko, A. Solovyeva, O. N. Novikova, Y. Lomako","doi":"10.29235/1561-8323-2021-65-2-185-190","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-185-190","url":null,"abstract":"Colibacteriosis is an acute zoonotic disease manifested by septicaemia, toxemia, enteritis, body dehydration, and central nervous system damage. Depending on the presence of virulence factors and the nature of interaction with the intestinal mucosa, enterotoxigenic, enteroinvasive, enteropathogenic, and enterohemorrhagic E. coli are isolated. Enterotoxigenic strains of E. coli occupy one of the leading places in the etiological structure of calf colibacteriosis in many livestock farms of the Republic of Belarus. The main reason why this disease develops is the presence of thermolabile and thermostable toxins in the causative strain. The thermolabile toxin subunit B is a potent antigen that allows pet immunity to be acquired against E. coli-induced cattle diarrhea. Many foreign vaccines used against intestinal infections of cattle contain either a native or recombinant variant of the subunit B. As a result of the work, we have created a new strain of E. coli 42eLTB – the producer of the recombinant subunit B of the thermolabile toxin E. coli. The producing capacity of the obtained strain is 480 mg with 1 culture liquid liter, which exceeds the already known strains 1.37 times. 186 Doklady of the National Academy of Sciences of Belarus, 2021, vol. 65, no. 2, рр. 185–190","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"72 1","pages":"185-190"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84559904","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

Content of pollutants in waste plastic of electrical equipment in Belarus 白俄罗斯电气设备废塑料中污染物的含量

Doklady Akademii nauk Pub Date : 2021-05-08 DOI: 10.29235/1561-8323-2021-65-2-224-233

T. Kukharchyk, V. D. Chernyuk, V. P. Kulakovich

{"title":"Content of pollutants in waste plastic of electrical equipment in Belarus","authors":"T. Kukharchyk, V. D. Chernyuk, V. P. Kulakovich","doi":"10.29235/1561-8323-2021-65-2-224-233","DOIUrl":"https://doi.org/10.29235/1561-8323-2021-65-2-224-233","url":null,"abstract":". The problem of management of waste plastic of electronic and electrical equipment (EEE) is associated, on the one hand, with the increase in the volume of their formation and the “green” circulation economy requirements for recycling, and, on the other hand, with the hazardous substances contained in them, including persistent organic pollutants (POPs) and heavy metals. The article presents the measurement results of the content of pollutants in EEE plastic samples taken at the enterprises for their collection and processing in Minsk. The content of heavy metals and bromine was determined in 40 plastic samples using X-ray fluorescence spectrometry, polybrominated biphenyls (PBBs) and of polybrominated diphenyl ethers (PBDEs) – in 19 samples using gas chromatography with mass spectrometric detection. It was shown that the content of lead was recorded in 40 % of samples (the maximum value is 259 mg/kg of plastic), of cadmium – 28 % (22 mg/kg), of chromium – 20 % (98 mg/kg); the content of mercury and PBB was found to be below the detection limit. PBDEs are contained in 7.5 % of samples in the range 246–6615 mg/kg. Decabromodiphenyl ether, a persistent organic pollutant, accounted for 89 to 96 % of the total PBDE. A high proportion of bromine-containing plastic (48 %) was revealed, which is consistent with the data of other countries. The need to carry out research in Belarus with the expansion of a list of analyzed pollutants in waste plastic and to develop the regulatory and technical base in relation to the management of waste plastic in accordance with the obligations of the Stockholm Convention on POPs is discussed.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"38 1","pages":"224-233"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91334087","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: 2