Cited Scientists: winter fuels and scaffolds

The Cited Scientists project sums up the publication activity of TPU scientists in April 2019. H-index of the most cited co-author of TPU scientists is 57. The IF of the most rated journal where TPU scientists published their articles, is 4.494. 


Photo: The tomography of polycaprolactone-based scaffold

School of Energy & Power Engineering

 Effect of high-temperature gas flow on ignition of the water-coal fuel particles

Journal:  Combustion and Flame (Q1, IF 4,494)

Geniy Kuznetsov, a principal researcher, professor at Butakov Research Center, Semen Syrodoy, a researcher fellow at Butakov Research Center, Nadezhda Gutareva, an associate professor at School of Core Engineering Education, Vladimir Salomatov, a principal researcher at the Laboratory of Radiation Heat Exchange of the Kutateladze Institute of Thermal Physics (Novosibirsk).

The mathematical model of the ignition process of a drop of water-coal fuel (WCF) developed by the authors in the flow of a high-temperature oxidizer (air) has been presented. According to the results of the mathematical modeling, it has been established that the zone of ignition of the WCF particle with an increase in the flow velocity shifts to the area of the aerodynamic trace of the drop. A prognostic modeling of the ignition processes of the water-coal fuel drops under conditions corresponding to the furnace spaces (intensive radiation-convective heating, change in the dynamics of the aerodynamic spectrum of a fuel particle) of typical boiler units has been carried out. A comparative analysis of the ignition delay times (tign), obtained theoretically, and published earlier experimental values of (tign) has showed their good conformance.

 

The results of the mathematical modeling have shown that the best option for stable ignition and burning of the WCF drop can be a combustion space consisting of two successive combustion chambers: in the first one, the thermal preparation and ignition of the WCF particle is carried out, and the second one is direct combustion.

 

School of Earth Sciences & Engineering

Modeling the H2SO4-catalyzed isobutane alkylation with alkenes considering the process unsteadiness

Journal: Catalysis Today (Q1, IF 4.667)

Elena Ivashkina, a professor at Division for Chemical Engineering, Irena Dolganova, an associate professor at Division for Chemical Engineering, Emiliya Ivanchina, a professor at Division for Chemical Engineering, Asem Nurmakanova, TPU, Alexander Bekker, a PhD student at Division for Chemical Engineering.

The aim of this work is to increase the yield of isoalkanes and improve the quality of the alkylate produced by optimizing the operating conditions of the reactor using the unsteady mathematical model. The theoretical significance of this work consists in obtaining new data on thermodynamic and kinetic regularities of the process of H2SO4-catalyzed isobutane alkylation with alkenes in an industrial reactor, substantiating the level of the reaction network detalization. It was also found that the alkylate yield increases by 400 tones/h with increasing the concentration of isobutane in the feedstock by1%, and the octane number of the produced alkylate increases by 0.8–1.0 ppm with increasing the concentration of isobutane in 1.3 times. It was shown that is necessary to maintain the acid at optimum level by controlling the fresh catalyst supply and withdrawing the deactivated acid, and the fresh catalyst flow rate can be calculated using the unsteady reactor model.

 

Unsteady-state mathematical model of diesel fuels catalytic dewaxing process

Journal:  Catalysis Today (Q1, IF 4,667)

Natalia Belinskaya, a research fellow at Division for Chemical Engineering, Evgeniya Frantsyna, a research fellow at Division for Chemical Engineering, Emiliya Ivanchina, a professor at Division for Chemical Engineering.  

In this work, the mathematical model of the process of diesel fuels catalytic dewaxing was developed. Calculations on the mathematical model show the effect of temperature, feedstock composition and catalyst activity on the catalytic dewaxing process. It was established that operation of the process under optimal conditions, determined by calculations on the mathematical model, increases the catalyst service life by 6%.

 

School of Non-Destructive Testing & Safety

 Corrosion and high-temperature steam oxidation of E110 alloy and its laser welds after ion irradiation

Journal: Corrosion Science (Q1, IF 4,862)

Mikhail Slobodyan, an associate professor at Division for Electronic Engineering, Sergey Pavlov, an engineer at School of High Energy Physics, Gennady Remnev, a leading research fellow at School of High Energy Physics, head of the Laboratory for Pulse-Beam, Electrical Discharge, and Plasma Technologies.

Corrosion and high-temperature steam oxidation of E110 alloy and its pulsed laser welds were investigated. An attempt to improve performance properties has been made by modifying the surface with a pulsed ion beam. The properties of welded joints that affect their resistance to corrosion and high-temperature steam oxidation are presented. The results of the study of surfaces and cross-sections of the pre- and non-irradiated samples after autoclave corrosion test of high-temperature steam oxidation are shown and discussed. It was concluded that there are no reasons to recommend the studied technology of surface modification to the nuclear industry.

 

Research School of Chemistry & Applied Biomedical Sciences

Characterization of biomimetic silicate- and strontium-containing hydroxyapatite microparticles embedded in biodegradable electrospun polycaprolactone scaffolds for bone regeneration

Journal:  European Polymer Journal (Q1, IF 3.741)

Roman Surmenev, a leading research fellow at Research Center Physical Material Science and Composite Materials, Svetlana Shkarina, a research engineer at Research Center Physical Material Science and Composite Materials, Maria Surmeneva, SRF at Research Center Physical Material Science and Composite Materials, Anna Syromitina, TPU, Elizaveta Melnik, TPU, Irina Selezneva, Institute of Theoretical and Experimental Biophysics RAS, Artem Ermakov, Institute of Theoretical and Experimental Biophysics RAS, Sergei I. Ivlev, University of Marburg (Germany), Angelica Cecilia (h-index 23), Venera Weinhardt, Tilo Baumbach (h-index 34), Roman Shkarin , Karlsruhe Institute of Technology (Germany), Tomaz Rijavec, Ales Lapanje (h-index 15), Josef Stefan Institute (Slovenia), Marina Chaikina, Institute of Solid State Chemistry and Mechanochemistry of SB RAS.   

A significant need exists today to develop novel alternatives to traditional bone grafts. Here, we report the potential use of mechanochemically synthesized hydroxyapatite (HA), silicate-, or strontium-containing HA microparticles and microparticle aggregates in combination with polycaprolactone (PCL) as hybrid scaffolds for filling bone defects. The detailed characterization of scaffolds was performed with high-resolution synchrotron radiation–based microcomputed laminography, XRD, EDX, and FTIR. An in vitro cell-scaffold interaction analysis showed a significant improvement of cell spreading in the case of hybrid scaffolds with silicate- and Sr-containing HA. Scaffolds with Sr- and silicate-containing HA affected the expression of several genes involved in morphogenesis and transcription. Scaffolds with Sr-containing HA increased the expression of markers of the primary component of the extracellular matrix, and scaffolds with Sr-containing HA facilitated cell mineralization via an increase in osteocalcin production. The hybrid scaffolds with silicate- and Sr-containing HA microparticles exerted the highest antibacterial activity against gram-positive bacterium Staphylococcus aureus compared to the unmodified PCL scaffolds. Based on these findings, the obtained scaffolds with Sr- or silicate-containing HA are believed to hold promise for bone tissue regeneration as compared to scaffolds containing pure HA.

 

School of Core Engineering Education

Time-of-Flight measurements with a detector using a liquid Cherenkov radiator-prototype of a possible TOF detector for the Super-FRS at FAIR

 

Journal: Nuclear Instruments and Methods in Physics Research A (Q2, IF 1.336)

Oleg Bogdanov, an associate professor at Division of Mathematics and Computer Science, Natalia Kuzminchuk-Feuerstein,  Bernd Voss, Helmholtz Center for the Study of Heavy Ions (Darmstadt, Germany), Elena Rozhkova, TPU, Crisroph Scheidenberger (h-index 57), Giessen University (Germany).

Aiming to develop a Time-of-Flight (TOF) detector with a precision down to about 50 ps (σ) in time, radiation hard and operating with a high radiation rate of relativistic heavy ions of up to 107 per spill of 1 to 10 s., we have constructed a new Time-of-Flight Cherenkov detector based on an Iodine-Naphthalene liquid radiator. This fluid with high refractive index (n=1.7003) was chosen to cover the corresponding velocities of the ions β ∼ 0.59-0.92 at the future Super-FRS at FAIR. The application of a liquid radiator allows to circulate the material and therefore greatly reduce the effects of a degradation of the optical performance during exposure to the high ion rates and radiation dose at the focal planes of the Super-FRS. The key properties of the prototype of a TOF-Cherenkov detector have been investigated in measurements with nickel ions at GSI in 2014. More recently, TOF measurements were performed with xenon ions at 600 MeV/u at GSI in 2016 and a timing resolution of 63 ps (standard deviation σ) was achieved.