Spacial and temporal dynamics of the volume fraction of the colloidal particles inside a drying sessile drop

Using lubrication theory, drying processes of sessile colloidal droplets on a solid substrate are studied. A simple model is proposed to describe temporal dynamics both the shape of the drop and the volume fraction of the colloidal particles inside the drop. The concentration dependence of the viscosity is taken into account. It is shown that the final shapes of the drops depend on both the initial volume fraction of the colloidal particles and the capillary number. The results of our simulations are in a reasonable agreement with the published experimental data. The computations for the drops of aqueous solution of human serum albumin (HSA) are presented.Comment: Submitted to EPJE, 7 pages, 8 figure

On The 100th Anniversary Of The Founder Of The Odessa Scientific School Of Economic Thought A. K. Pokrytan

The partnership between the Odessa National University of Economics and "D. A. Tsenov” Academy of Economics is an example of a successful model for adding value in the field of scientific research. With its annual scientific conferences, the Odessa National University of Economics has provided dozens of scientists from the Svishtov Academy and other foreign researchers with the opportunity to publish their papers abroad. Prof. Mihail Zveryakov himself is a Doctor Honoris Causa (Zastrahovatel.com, 2010) of D. A. Tsenov Academy and a prominent co-author in collaborative research publications indexed in SCOPUS Q1/WoS (Zahariev, et al., 2020). The paper commemorates and pays due respect to Prof. Anatoly Karpovich Pokrytan - one of the most prominent scientists in the field of economics whose centenary provided his scientific followers with the opportunity to reflect on his scientific legacy. The 100th anniversary of the establishment of the Odessa National Economic University in Ukraine (founded under the name Odessa Institute of National Economy) on 16 May 1921 is another evidence for our Ukrainian partner’s tenacity during the decades of intense socio-economic and ideological changes of the 20th and the 21st century

ВЕНЧУРНЫЙ БИЗНЕС В КОНТЕКСТЕ БЕЛОРУССКОГО ЗАКОНОДАТЕЛЬСТВА

The paper proposes a new definition for a venture business subject on the basis of the analysis of Belarusian legislation for innovation-based economic development inBelarus. The new definition will give a new impetus to the venture business development by relevant application of privileges and preferences and attraction of investments in the Belarusian economy. На основании анализа белорусского законодательства, регламентирующего инновационное развитие экономики, предложены изменения в определении субъектов индустрии венчурного бизнеса, что должно придать импульс его развитию посредством соответствующего применения льгот и преференций, а также привлечению инвестиционного капитала в экономику Республики Беларусь

Correlation effects during liquid infiltration into hydrophobic nanoporous mediums

Correlation effects arising during liquid infiltration into hydrophobic porous medium are considered. On the basis of these effects a mechanism of energy absorption at filling porous medium by nonwetting liquid is suggested. In accordance with this mechanism, the absorption of mechanical energy is a result expenditure of energy for the formation of menisci in the pores on the shell of the infinite cluster and expenditure of energy for the formation of liquid-porous medium interface in the pores belonging to the infinite cluster of filled pores. It was found that in dependences on the porosity and, consequently, in dependences on the number of filled pores neighbors, the thermal effect of filling can be either positive or negative and the cycle of infiltration-defiltration can be closed with full outflow of liquid. It can occur under certain relation between percolation properties of porous medium and the energy characteristics of the liquid-porous medium interface and the liquid-gas interface. It is shown that a consecutive account of these correlation effects and percolation properties of the pores space during infiltration allow to describe all experimental data under discussion

Computer simulation and study of the IR spectra of irradiated polymer materials

Within the framework of MDDP the calculations of IR spectra have been performed for the initial polyethylene terephthalate (PET) and its state with the cation which satisfactorily describing experimental data. The calculations were made using the MDDP (modified neglect of diatomic differential overlap), implemented in the program MOPAC 2012. A feature of the method is that the overlap integrals are replaced by the [delta]-function, single-site Coulomb and exchange integrals are calculated by atomic parameters Slater-Condon. In recent years the studies of the structure and physico-chemical properties of polyethylene terephthalate and composites made on it basis have got the intensive development. Comparison of calculations with experimental data gives their satisfactory agreement

Анализ привлечения ТЭЦ, работающей по тепловому графику, к прохождению провалов графиков электрической нагрузки

The paper describes technical and economic evaluation of various methods pertaining to passing through failures of electric load at TPP which is operating in accordance with heating schedule.Проведена технико-экономическая оценка различных способов прохождения провалов электрической нагрузки на ТЭЦ, работающей по тепловому графику

Децентрализованное теплоснабжение – альтернатива централизованному

The paper presents a concrete example that shows comparative characteristics of decentralized and centralized heat supply. It has been shown in the paper that selection of this or that variant of heat supply significantly depends on losses in heat supply networks.На конкретном примере приведена сравнительная характеристика децентрализованного и централизованного теплоснабжения. Показано, что выбор того или иного варианта теплоснабжения существенно зависит от потерь в тепловых сетях

Синтез арилгидразонов бифенил-4-карбоновой кислоты в водной среде при воздействии микроволнового излучения

Biphenyl-4-carboxylic acid arylhydrazones have been synthesized in aqueous medium under microwave activation. It has been shown that use of microwave irradiation reduces the reaction time and provides the product yield of 89-92 %. Biocidal properties of compounds prepared have been studied.Синтезированы арилгидразоны бифенил-4-карбоновой кислоты в водной среде в условиях микроволнового излучения. Показано, что использование микроволнового излучения сокращает время реакции и обеспечивает выходы целевых продуктов 89-92 %. Исследованы биоцидные свойства полученных соединений

Синтез производных м-терфенила в качестве стабилизаторов полимерных материалов

Methods for synthesis of m-terphenyl derivatives used as effective polymeric material stabilizers, food antioxidants, medicine preservatives have been discussed.Рассмотрены методы синтеза производных м-терфенила - эффективных стабилизаторов полимерных материалов, антиокислителей пищевых продуктов, консервантов медицинских препаратов

Nonlinear dynamics of magnetohydrodynamic flows of heavy fluid over an arbitrary surface in shallow water approximation

The magnetohydrodynamic equations system for heavy fluid over an arbitrary surface in shallow water approximation is studied in the present paper. It is shown that simple wave solutions exist only for underlying surfaces that are slopes of constant inclination. All self-similar discontinuous and continuous solutions are found. The exact explicit solutions of initial discontinuity decay problem over a flat plane and a slope are found. It is shown that the initial discontinuity decay solution is represented by one of five possible wave configurations. For each configuration the necessary and sufficient conditions for its realization are found. The change of dependent and independent variables transforming the initial equations over a slope to those over a flat plane is found.Comment: 43 pages, submitted to Theoretical and Computational Fluid Dynamic