Pub Date : 2024-01-07DOI: 10.29235/15618323-2023-67-6-490-498
V. Y. Galitskaya, M. P. Potapnev, V. I. Asaevich, V. G. Bogdan, S. Kosmacheva, F. N. Karpenko
A platelet gel (PG) derived from platelet concentrate (PC) is considered as a perspective therapeutic agent with hemostatic and regenerative properties. PG was obtained from PC separated from human peripheral blood by automatic apheresis by adding human thrombin (30 U/ml). We compared the proliferation of human mesenchymal stromal cells (MSCs) in vitro in the presence of PG and the dependence of gel density on excess of fibrinogen, the presence of calcium chloride, calcium gluconate, and aprotinin. PG was formed from CT in the presence of thrombin during 5–10 minutes. PG as gel-like fibrin membrane contained platelets and an admixture of leukocytes, and was capable to enhance the proliferation of MSCs in vitro. The presence of calcium gluconate (10 mg/ml) increased in the presence of PG the rate of MSCs proliferation in vitro. The presence of aprotinin in PG at a concentration of 10–1000 KIU/ml caused a dose-dependent decrease in the rate of gel biodegradation and did not affect the ability of PG to stimulate the proliferation of human MSCs in vitro.
{"title":"Platelet gel and factors determining its biological activity","authors":"V. Y. Galitskaya, M. P. Potapnev, V. I. Asaevich, V. G. Bogdan, S. Kosmacheva, F. N. Karpenko","doi":"10.29235/15618323-2023-67-6-490-498","DOIUrl":"https://doi.org/10.29235/15618323-2023-67-6-490-498","url":null,"abstract":"A platelet gel (PG) derived from platelet concentrate (PC) is considered as a perspective therapeutic agent with hemostatic and regenerative properties. PG was obtained from PC separated from human peripheral blood by automatic apheresis by adding human thrombin (30 U/ml). We compared the proliferation of human mesenchymal stromal cells (MSCs) in vitro in the presence of PG and the dependence of gel density on excess of fibrinogen, the presence of calcium chloride, calcium gluconate, and aprotinin. PG was formed from CT in the presence of thrombin during 5–10 minutes. PG as gel-like fibrin membrane contained platelets and an admixture of leukocytes, and was capable to enhance the proliferation of MSCs in vitro. The presence of calcium gluconate (10 mg/ml) increased in the presence of PG the rate of MSCs proliferation in vitro. The presence of aprotinin in PG at a concentration of 10–1000 KIU/ml caused a dose-dependent decrease in the rate of gel biodegradation and did not affect the ability of PG to stimulate the proliferation of human MSCs in vitro.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"16 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448565","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}
Pub Date : 2024-01-07DOI: 10.29235/1561-8323-2023-67-6-481-489
N. Kanunnikova, D. Semenovich, I. N. Katkovskaya, O. V. Titko, E. P. Lukiyenko, V. Gurinovich, A. Moiseenok
An Alzheimer-like pathological process was induced in mature female Wistar CRL: (WI) WUBR rats using aluminum chloride (200 mg/kg, intragastrically, 6 weeks) in order to model redox imbalance and oxidative stress (OS) in the hippocampus and study the possibilities of their correction 2 weekly administration of coenzyme A biosynthesis modulators (panthenol – PL, pantethine – PT, homopantothenate – HP) at a dose of 200 mg/kg intragastrically for 2 weeks). Against the background of activation of peroxidation processes and a decrease in acetylcholinesterase activity, a decrease in the reduction potential of glutathione and the level of the acid-soluble fraction of CoA was observed with a simultaneous increase in the activity of glutathione-metabolizing enzymes (GR, GPx, GST), the process of S-glutathionylation of proteins and the level of protein thiols. The consumption of the precursors of CoA biosynthesis in full (PL, PT) or in part (HP) had an antioxidant effect, restored the activity of AChE, the level and reduction potential of glutathione and glutathione-metabolizing enzymes, the process of S-glutathionylation, and stimulated the activity of enzymes generating NADPH+. Taking into account the low modulating effect of coenzyme precursors on the level of CoA in the hippocampus and their high redox pharmacological activity, their non-coenzymatic effect on redox mechanisms leading to an increase in the bioavailability of reducing equivalents and energy status is assumed.
使用氯化铝（200 毫克/千克，胃内注射，6 周）诱导成熟雌性 Wistar CRL：(WI) WUBR大鼠，以建立海马氧化还原失衡和氧化应激(OS)模型，并研究每周服用辅酶A生物合成调节剂（泛醇-PL、泛酸-PT、同泛酸盐-HP）的可能性。在过氧化过程被激活和乙酰胆碱酯酶活性降低的背景下，观察到谷胱甘肽的还原电位和 CoA 酸溶性部分的水平下降，同时谷胱甘肽代谢酶（GR、GPx、GST）的活性、蛋白质的 S-谷胱甘肽化过程和蛋白质硫醇的水平上升。完全（PL、PT）或部分（HP）摄入 CoA 生物合成的前体具有抗氧化作用，可恢复 AChE 的活性、谷胱甘肽和谷胱甘肽代谢酶的水平和还原电位、S-谷胱甘肽化过程，并刺激产生 NADPH+ 的酶的活性。考虑到辅酶前体对海马体内 CoA 水平的调节作用较低，而其氧化还原药理活性较高，因此假定其对氧化还原机制的非酶作用可导致还原当量生物利用率和能量状态的提高。
{"title":"Modelling the redox imbalance and oxidative stress in the hippocampus at aluminum neurotoxicity and initiating the coenzyme А biosynthesis","authors":"N. Kanunnikova, D. Semenovich, I. N. Katkovskaya, O. V. Titko, E. P. Lukiyenko, V. Gurinovich, A. Moiseenok","doi":"10.29235/1561-8323-2023-67-6-481-489","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-481-489","url":null,"abstract":"An Alzheimer-like pathological process was induced in mature female Wistar CRL: (WI) WUBR rats using aluminum chloride (200 mg/kg, intragastrically, 6 weeks) in order to model redox imbalance and oxidative stress (OS) in the hippocampus and study the possibilities of their correction 2 weekly administration of coenzyme A biosynthesis modulators (panthenol – PL, pantethine – PT, homopantothenate – HP) at a dose of 200 mg/kg intragastrically for 2 weeks). Against the background of activation of peroxidation processes and a decrease in acetylcholinesterase activity, a decrease in the reduction potential of glutathione and the level of the acid-soluble fraction of CoA was observed with a simultaneous increase in the activity of glutathione-metabolizing enzymes (GR, GPx, GST), the process of S-glutathionylation of proteins and the level of protein thiols. The consumption of the precursors of CoA biosynthesis in full (PL, PT) or in part (HP) had an antioxidant effect, restored the activity of AChE, the level and reduction potential of glutathione and glutathione-metabolizing enzymes, the process of S-glutathionylation, and stimulated the activity of enzymes generating NADPH+. Taking into account the low modulating effect of coenzyme precursors on the level of CoA in the hippocampus and their high redox pharmacological activity, their non-coenzymatic effect on redox mechanisms leading to an increase in the bioavailability of reducing equivalents and energy status is assumed.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"23 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448719","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}
Pub Date : 2024-01-07DOI: 10.29235/1561-8323-2023-67-6-508-516
O. F. Demidenko, A. L. Zhaludkevich, A. O. Laryn, G. Govor, Sun Haibo, Dongchu Chen, S. Yankevich
A multi-stage technique for applying insulating coatings to metal powder particles has been developed in order to create a new class of Fe-based soft magnetic materials with improved characteristics. The density value calculated from the data of X-ray diffraction analysis is approximately 3 % higher than the experimentally measured values, which are 7.4–7.45 g/cm3. The low porosity of the composites is confirmed by the SEM and EDX results. The proposed method of encapsulation of iron powder with an oxide layer is a highly economical method for applying coatings of various chemical compositions to metal powders, and can be widely used in practice to obtain electrical materials. Comprehensive studies of the properties of the obtained samples of powder composite materials based on ABC100.30 iron, the particles of which are encapsulated with phosphorus oxide, have been carried out. It has been established that in a field of 1.5 T, the losses at a frequency of 1 kHz decrease 10 times with an increase in the thickness to 30 nm. The synthesized materials are recommended for use in the development of various types of high-frequency electric motors, generators, chokes, magnetic circuits and electrodes for high-frequency welding and other applications.
我们开发了一种在金属粉末颗粒上涂覆绝缘涂层的多阶段技术，以制造出一种具有更好特性的新型铁基软磁材料。根据 X 射线衍射分析数据计算得出的密度值比实验测量值（7.4-7.45 克/立方厘米）高出约 3%。扫描电子显微镜（SEM）和电离辐射 X 射线分析（EDX）结果证实了复合材料的低孔隙率。所提出的用氧化物层包裹铁粉的方法是一种非常经济的方法，可为金属粉末涂上各种化学成分的涂层，可广泛应用于获得电学材料。我们对基于 ABC100.30 铁（其颗粒被氧化磷包裹）的粉末复合材料样品的性能进行了全面研究。结果表明，在 1.5 T 的电场中，厚度增加到 30 nm 时，频率为 1 kHz 时的损耗降低了 10 倍。建议将合成材料用于开发各类高频电机、发电机、扼流圈、磁路和高频焊接电极及其他应用。
{"title":"Structure, soft magnetic properties of Fe-based magnetic composites and its practical application","authors":"O. F. Demidenko, A. L. Zhaludkevich, A. O. Laryn, G. Govor, Sun Haibo, Dongchu Chen, S. Yankevich","doi":"10.29235/1561-8323-2023-67-6-508-516","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-508-516","url":null,"abstract":"A multi-stage technique for applying insulating coatings to metal powder particles has been developed in order to create a new class of Fe-based soft magnetic materials with improved characteristics. The density value calculated from the data of X-ray diffraction analysis is approximately 3 % higher than the experimentally measured values, which are 7.4–7.45 g/cm3. The low porosity of the composites is confirmed by the SEM and EDX results. The proposed method of encapsulation of iron powder with an oxide layer is a highly economical method for applying coatings of various chemical compositions to metal powders, and can be widely used in practice to obtain electrical materials. Comprehensive studies of the properties of the obtained samples of powder composite materials based on ABC100.30 iron, the particles of which are encapsulated with phosphorus oxide, have been carried out. It has been established that in a field of 1.5 T, the losses at a frequency of 1 kHz decrease 10 times with an increase in the thickness to 30 nm. The synthesized materials are recommended for use in the development of various types of high-frequency electric motors, generators, chokes, magnetic circuits and electrodes for high-frequency welding and other applications.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"31 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448570","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}
Pub Date : 2024-01-07DOI: 10.29235/1561-8323-2023-67-6-499-507
S. A. Lysenko, V. F. Loginov
A new method of teleconnections studding is proposed which is based on the identification of conjugate regions in the global meteorological fields of temperature and pressure by their characteristic coherent quasi-periodic oscillation. This method was implemented in order to select predictors of winter air temperature in Belarus with an advance of 2 months. The degree of coherence of sea level pressure and winter temperature in Belarus on a quasi-8-year cycle was considered as a criterion for the selection of predictors. The forecast was implemented using the advanced deep machine learning model TimesNet and showed rather high metrics of quality for seasonal meteorological forecasting: the correlation coefficient between actual and predicted temperature values was 0.66, and the weighted macro-average values of precision and recall of the forecast in the gradations “normal”, “above normal” and “below normal” were 0.61 and 0.56, respectively.
{"title":"Spatial and temporal coherence of quasi-periodic components of meteorological fields as a basis for long-term weather forecasts","authors":"S. A. Lysenko, V. F. Loginov","doi":"10.29235/1561-8323-2023-67-6-499-507","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-499-507","url":null,"abstract":"A new method of teleconnections studding is proposed which is based on the identification of conjugate regions in the global meteorological fields of temperature and pressure by their characteristic coherent quasi-periodic oscillation. This method was implemented in order to select predictors of winter air temperature in Belarus with an advance of 2 months. The degree of coherence of sea level pressure and winter temperature in Belarus on a quasi-8-year cycle was considered as a criterion for the selection of predictors. The forecast was implemented using the advanced deep machine learning model TimesNet and showed rather high metrics of quality for seasonal meteorological forecasting: the correlation coefficient between actual and predicted temperature values was 0.66, and the weighted macro-average values of precision and recall of the forecast in the gradations “normal”, “above normal” and “below normal” were 0.61 and 0.56, respectively.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"33 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448377","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}
Pub Date : 2024-01-06DOI: 10.29235/1561-8323-2023-67-6-473-480
S. V. Bucha, A. D. Vorobiev, D. V. Cherednichenko, E. V. Vorobieva, E. V. Laevskaya, N. Krutko, H. V. Bondareva
The effect of sodium polyacrylate, polyethylene glycol of various molecular weights, and their mixtures on the dispersion stability of calcium and magnesium carbonates was studied. It was shown that in the presence of a binary system, the light transmission of the dispersion decreases 1.2–1.5 times, the content of fine fraction particles increases by 1.1–1.3 times compared to the individual components. The stability of the dispersion of carbonates depends on the components ratio in the binary system and their molecular weight. The formation of adsorption solvated layers of polyacrylate and polyethylene glycol molecules at the interphase boundary contributes to an increase in the stability of the carbonate dispersion.
{"title":"Effect of a nonionic surfactant and anionic polyelectrolyte binary system on the stability of a calcium and magnesium carbonates dispersion","authors":"S. V. Bucha, A. D. Vorobiev, D. V. Cherednichenko, E. V. Vorobieva, E. V. Laevskaya, N. Krutko, H. V. Bondareva","doi":"10.29235/1561-8323-2023-67-6-473-480","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-473-480","url":null,"abstract":"The effect of sodium polyacrylate, polyethylene glycol of various molecular weights, and their mixtures on the dispersion stability of calcium and magnesium carbonates was studied. It was shown that in the presence of a binary system, the light transmission of the dispersion decreases 1.2–1.5 times, the content of fine fraction particles increases by 1.1–1.3 times compared to the individual components. The stability of the dispersion of carbonates depends on the components ratio in the binary system and their molecular weight. The formation of adsorption solvated layers of polyacrylate and polyethylene glycol molecules at the interphase boundary contributes to an increase in the stability of the carbonate dispersion.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"51 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449409","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}
Pub Date : 2024-01-06DOI: 10.29235/1561-8323-2023-67-6-465-472
V. S. Soldatov, E. Kosandrovich, T. V. Bezyazychnaya
A fibrous carboxylic ion exchanger, obtained by post-radiation grafting of polyacrylic acid to polypropylene fiber, in the ammonium form has an abnormally low swelling in water, corresponding to 10 moles of water per equivalent, and in the form of tetraethylammonium ion (NEt4+) – abnormally high 25 moles of water/eq. Considering that NH4+ is a hydrophilic particle and NEt4+ is hydrophobic, this fact seems paradoxical. The article attempts to explain this phenomenon using molecular modeling (ab initio calculations of the structure of hydrate complexes in the HF MO LCAO approximation with the 6-31G basis set) in combination with the Predominant Hydrates Model, which made it possible to calculate the theoretical water sorption isotherms of the ion exchanger and compare them with experimental data. The abnormally low swelling of the ion exchanger in the NH4+-form is caused by the formation of a strong bond between the carboxylate anion and ammonium with a significant degree of covalence due to the superposition of the Coulomb interaction of the ions and the formation of a hydrogen bond between them. The abnormally high swelling of NEt4+-forms is caused by the absence of a strong interaction between cations and carboxylate groups due to the impossibility of their convergence due to steric reasons. The high swelling of the ion exchanger is caused by the absence of blocking of the hydrophilic carboxylate groups of the ion exchanger by hydrogen bonds with the cation. The ion exchanger matrix does not contain a cross agent and does not create a spatial restriction for the high swelling of the ion exchanger.
在聚丙烯纤维上通过辐照后接枝聚丙烯酸而获得的纤维状羧酸离子交换剂，以铵形式存在时，在水中的膨胀率异常低，相当于 10 摩尔水/当量，而以四乙基铵离子（NEt4+）形式存在时，膨胀率异常高，达到 25 摩尔水/当量。考虑到 NH4+ 是亲水性粒子，而 NEt4+ 是疏水性粒子，这一事实似乎自相矛盾。文章试图利用分子建模（在 HF MO LCAO 近似中利用 6-31G 基集对水合物复合物的结构进行 ab initio 计算）并结合 Predominant Hydrates Model（主要水合物模型）来解释这一现象，从而计算出离子交换器的理论吸水等温线，并将其与实验数据进行比较。NH4+ 形式的离子交换剂膨胀率异常低的原因是羧酸根阴离子和铵之间形成了强键，由于离子之间的库仑相互作用和氢键形成的叠加作用，羧酸根阴离子和铵之间形成了共价程度很高的强键。NEt4+ 形式的膨胀率异常之高，是因为阳离子和羧基之间没有强烈的相互作用，这是因为立体原因导致阳离子和羧基不可能聚合在一起。离子交换剂的高膨胀性是由于离子交换剂的亲水性羧酸基团与阳离子之间没有氢键阻隔。离子交换剂基体不含交叉剂，不会对离子交换剂的高膨胀性造成空间限制。
{"title":"Abnormal swelling in water of carboxylic ion exchanger in the forms of ammonium and tetraethylammonium ions","authors":"V. S. Soldatov, E. Kosandrovich, T. V. Bezyazychnaya","doi":"10.29235/1561-8323-2023-67-6-465-472","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-465-472","url":null,"abstract":"A fibrous carboxylic ion exchanger, obtained by post-radiation grafting of polyacrylic acid to polypropylene fiber, in the ammonium form has an abnormally low swelling in water, corresponding to 10 moles of water per equivalent, and in the form of tetraethylammonium ion (NEt4+) – abnormally high 25 moles of water/eq. Considering that NH4+ is a hydrophilic particle and NEt4+ is hydrophobic, this fact seems paradoxical. The article attempts to explain this phenomenon using molecular modeling (ab initio calculations of the structure of hydrate complexes in the HF MO LCAO approximation with the 6-31G basis set) in combination with the Predominant Hydrates Model, which made it possible to calculate the theoretical water sorption isotherms of the ion exchanger and compare them with experimental data. The abnormally low swelling of the ion exchanger in the NH4+-form is caused by the formation of a strong bond between the carboxylate anion and ammonium with a significant degree of covalence due to the superposition of the Coulomb interaction of the ions and the formation of a hydrogen bond between them. The abnormally high swelling of NEt4+-forms is caused by the absence of a strong interaction between cations and carboxylate groups due to the impossibility of their convergence due to steric reasons. The high swelling of the ion exchanger is caused by the absence of blocking of the hydrophilic carboxylate groups of the ion exchanger by hydrogen bonds with the cation. The ion exchanger matrix does not contain a cross agent and does not create a spatial restriction for the high swelling of the ion exchanger.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"60 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449639","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}
Pub Date : 2024-01-06DOI: 10.29235/1561-83232023-67-6-460-464
I. N. Safonova, A. Skiba
Let X be a class of groups. Suppose that with each group G ∈ X we associate some system of its subgroups τ(G). Then τ is said to be a subgroup functor on X if the following conditions are hold: (1) G ∈ τ(G) for each group G ∈ X; (2) for any epimorphism φ: A → B, where A, B ∈ X, and for any groups H ∈ τ(A) and T ∈ τ(B) we have Hφ ∈ τ(B) and Tφ-1 ∈ τ( A). In this paper, were considered some applications of such subgroup functors in the theory of finite groups in which generalized normality for subgroups is transitive.
{"title":"On some classes of finite σ-soluble PσT-groups","authors":"I. N. Safonova, A. Skiba","doi":"10.29235/1561-83232023-67-6-460-464","DOIUrl":"https://doi.org/10.29235/1561-83232023-67-6-460-464","url":null,"abstract":"Let X be a class of groups. Suppose that with each group G ∈ X we associate some system of its subgroups τ(G). Then τ is said to be a subgroup functor on X if the following conditions are hold: (1) G ∈ τ(G) for each group G ∈ X; (2) for any epimorphism φ: A → B, where A, B ∈ X, and for any groups H ∈ τ(A) and T ∈ τ(B) we have Hφ ∈ τ(B) and Tφ-1 ∈ τ( A). In this paper, were considered some applications of such subgroup functors in the theory of finite groups in which generalized normality for subgroups is transitive.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"61 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448924","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}
Pub Date : 2024-01-05DOI: 10.29235/1561-8323-2023-67-6-454-459
P. P. Matus, D. Pylak
In this paper, we construct and study unconditionally monotone and globally stable difference schemes for the Fisher equation. It has been shown that constructed schemes inherit the stability property of the exact solution: 0 ≤ u(x, t) ≤ 1, (x, t) ∈ QT = {(x, t) : 0 ≤ x ≤ l, 0 ≤ t < +∞} for a given input data of the problem. The unconditional monotonicity of the difference schemes is proved and the a priori estimate is obtained in the uniform norm for the difference solution. The stable behavior of the difference solution in the nonlinear case takes place under slightly more stringent constraints on the input data: 0,5 ≤ u0 (x), µ1(t), µ2(t) ≤ 1.
{"title":"Unconditionally monotone and globally stable difference schemes for the Fisher equation","authors":"P. P. Matus, D. Pylak","doi":"10.29235/1561-8323-2023-67-6-454-459","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-454-459","url":null,"abstract":"In this paper, we construct and study unconditionally monotone and globally stable difference schemes for the Fisher equation. It has been shown that constructed schemes inherit the stability property of the exact solution: 0 ≤ u(x, t) ≤ 1, (x, t) ∈ QT = {(x, t) : 0 ≤ x ≤ l, 0 ≤ t < +∞} for a given input data of the problem. The unconditional monotonicity of the difference schemes is proved and the a priori estimate is obtained in the uniform norm for the difference solution. The stable behavior of the difference solution in the nonlinear case takes place under slightly more stringent constraints on the input data: 0,5 ≤ u0 (x), µ1(t), µ2(t) ≤ 1.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"76 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139450389","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}
Pub Date : 2024-01-05DOI: 10.29235/1561-8323-2023-67-6-447-453
A. A. Kavalenia
The article shows the achievements of the Department of Humanitarian Sciences and Arts of the National Academy of Sciences of Belarus at the beginning of the 21st century.
文章展示了白俄罗斯国家科学院人道主义科学与艺术部在21世纪初取得的成就。
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Pub Date : 2024-01-05DOI: 10.29235/1561-8323-2023-67-6-517-528
P. Kazakevich, U. N. Tsimoshanka, A. A. Muzyka, S. A. Kirikovich, L. N. Sheigratsova, M. P. Puchka, N. N. Shmatko, M. V. Tsimoshanka, A. I. Konek
The article presents the results of research, according to an energy assessment, of the most common options for combining spatial planning and technological solutions of buildings and structures, the set of technological equipment used on the most typical operating farms and milk production complexes. The most significant elements of technology and technological equipment, its operating modes, energy consumption by cost elements for the processes of preparation and distribution of feed, manure removal and provision of the required microclimate parameters, determining the intensity level of the production process in various variants of building layout and livestock, have been studied. The results obtained allow us to determine the most effective options for mechanization and automation of the production process and improve the technological methods of their implementation.
{"title":"Assessing the production processes on the most typical farms and milk production complexes","authors":"P. Kazakevich, U. N. Tsimoshanka, A. A. Muzyka, S. A. Kirikovich, L. N. Sheigratsova, M. P. Puchka, N. N. Shmatko, M. V. Tsimoshanka, A. I. Konek","doi":"10.29235/1561-8323-2023-67-6-517-528","DOIUrl":"https://doi.org/10.29235/1561-8323-2023-67-6-517-528","url":null,"abstract":"The article presents the results of research, according to an energy assessment, of the most common options for combining spatial planning and technological solutions of buildings and structures, the set of technological equipment used on the most typical operating farms and milk production complexes. The most significant elements of technology and technological equipment, its operating modes, energy consumption by cost elements for the processes of preparation and distribution of feed, manure removal and provision of the required microclimate parameters, determining the intensity level of the production process in various variants of building layout and livestock, have been studied. The results obtained allow us to determine the most effective options for mechanization and automation of the production process and improve the technological methods of their implementation.","PeriodicalId":11283,"journal":{"name":"Doklady of the National Academy of Sciences of Belarus","volume":"63 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449724","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}
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