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Arutiunian, Iryna,Mishuk, Katerina,Dankevych, Natalia,Yukhymenko, Artem,Anin, Victor,Poltavets, Maryna,Sharapova, Tetiana International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.1
Relative to the outer surface of the mastic coating, the reliability of the available waterproofing resource is determined by the ability to stabilize the structural characteristics in difficult climatic conditions. Organic components of mastic as a result of solar radiation, elevated temperatures and their alternating change, atmospheric oxidants, especially in industrial areas, have a tendency to self-polymerization and loss of low molecular weight components. This is the gradual loss of deformability and the transition to brittleness with its tendency to crack as the reasons for the gradual transition from normal to emergency operating condition.The presented mechanism of functioning of the coating surface indicates the expediency of increasing its components, able to stabilize the structure and prevent changes in deformability.Durability, hydrophobicity, water displacement, water absorption are accepted as estimating indicators. The main dependences of the influence of the lost additional components of mastic on the operational properties of the formed coating characterize the ability to provide successful resistance to environmental influences and longer stability. As a result, mastic acquires additional service life.
Bojan D. Djordjevi?,Slobodan P. ?erbanovi?,Ivona R. Grguri?,Mirjana Lj. Kijev?anin,Aleksandar ?. Tasi? 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.4
A comparison of the performances of two diferent approaches of cubic equations of state models, basedon a classical van der Wals and mixing rules incorporating the GEequation, was carried out for corelation ofVapor-Liquid Equilibria (VLE), HEand cPE data alone, and simultaneous correlation of VLE+HE, VLE+cPE, HE+cPE andVLE+HE+cPE data for the diethers (1,4-dioxane or 1,3-dioxolane) with n-alkane systems. For all calculations thePeng-Robinson-Stryjek-Vera cubic equation of state (PRSV CEOS) was used. A family of mixing rules for thePRSV CEOS based on the Modified van der Wals one-fluid mixing rule (MvdW1) and two well-known CEOS/GEmixing rules (MHV1 and MHV2), was considered. The NRTL equation, as the GEmodel with linear or reciprocal tem-perature dependent parameters, was incorporated in the CEOS/GEmodels. The results obtained by the CEOS/GEmodelsexhibit significant improvement in comparison to the MvdW1 models.
Darka Marković,Jelena Ašanin,Tim Nunney,Željko Radovanović,Marija Radoičić,Miodrag Mitrić,Dušan Mišić,Maja Radetić 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
This study discusses the possibility of fabrication of textile nanocomposites with antimicrobial activity againstantibiotics-resistant bacterial strains and yeast. Modification of cotton fabric with oxalic acid solutions of differentconcentrations provided free carboxyl groups for binding of Cu2+-ions from copper (II) sulfate solution which were furtherreduced with sodium borohydride in alkaline solution. An increase in the concentration of applied oxalic acid resulted inlarger amounts of free carboxyl groups on the cotton fibers, Cu2+-ions uptake and total amounts of Cu-based nanoparticlesafter reduction. XPS and XRD analyses suggested that nanoparticles mainly consisted of CuO with fractions of Cu2O. Fabricated textile nanocomposites ensured maximum reduction of Gram-negative E. coli ATCC 25922, E. coli NCTC 13846,E. coli ATCC BAA-2469, K. pneumoniae ATCC-BAA 2146 and P. aeruginosa ATCC 27853, Gram-positive bacteria S. aureus ATCC 25923 and S. aureus ATCC 43300 and yeast C. albicans ATCC 24433. Additionally, controlled release ofCu2+-ions from fabrics into the physiological saline solution was obtained within 24 hours.
Jelena Vuksanović,Mirjana Lj. Kijevčanin,Ivona R. Radović 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7
The ability of binary deep eutectic solvent choline chloride+1,2-propanediol (DES1; 1 : 3 mole ratio) and ternary deep eutectic solvent choline chloride+1,2-propanediol+water (DES2; 1 : 3 : 3 mole ratio) for breaking the azeotropes hexane/heptane+ethanol by means of liquid-liquid extraction was evaluated. Liquid-liquid equilibrium experiments were performed at 298.15 K, at atmospheric pressure, and data were correlated by NRTL and UNIQUAC models. Thermodynamic properties (density, viscosity, refractive index and speed of sound) of DES1 and DES2 were determined in temperature range from 288.15K to 333.15K and at atmospheric pressure. Extraction ability of the investigated eutectics yielded promising results in comparison with conventional solvents. Besides a high selectivity towards ethanol, an advantage of DES2 is its lower viscosity and higher distribution ratio values, which is an important aspect for a potential industrial application. Another advantage of both investigated eutectics is their easy and high recoverability from the extract layer based on their negligible vapor pressure.