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13.09.2017 Science

In the first issue of the new academic year the Cited Scientists project summarizes publication results of TPU researchers for the period of the past summer. According to the TPU Publication Activity Development Office, 83 articles with high IF were listed in the university register during three summer months. 52 articles were published in the Q1 and Q2 journals. Totally, in the first half of 2017 the research fellows and young scientists of TPU released 320 articles with high IF; out of this number 253 were published in the Q1 and Q2 journals. This is twice as much as over the same period of the last year.

 

Photo: Courtesy of a member of the SWERUS expedition.

 

H-index of the most cited co-author of TPU scientists is 44. The IF of the most rated journal is 7.504 (Nuclear Technology for Oncology).

Most articles were published in the scientific journals devoted to chemistry, physics and power engineering.

The most popular article in media is authored by scientists from the Institute of Natural Resources Natalia Shakhova, Oleg Dudarev and Igor Semiletov, published in Biogeosciences (IF 3.851; Q1). It has got the highest altmetrics.

Altmetrics track a range of sources to capture and collate research activity, helping scientists to monitor and report on the attention surrounding the work they care about.

Nuclear Technology for Oncology

Valeriya Kudryavtseva, an engineer at the Neuroprotection Laboratory, RASA Center at TPU et al.

Journal: ACS applied materials & interfaces  (IF 7.504; Q1)

Article: Polylactic Acid Sealed Polyelectrolyte Multilayer Microchambers for Entrapment of Salts and Small Hydrophilic Molecules Precipitates

Efficient depot systems for entrapment and storage of small water-soluble molecules are of high demand for wide variety of applications ranging from implant based drug delivery in medicine and catalysis in chemical processes to anticorrosive systems in industry where surface-mediated active component delivery is required on a time and site specific manner. This work reports the fabrication of individually sealed hollow-structured polyelectrolyte multilayer (PEM) microchamber arrays based on layer-by-layer self-assembly as scaffolds and microcontact printing. These PEM chambers are composed out of biocompatible polyelectrolytes and sealed by a monolayer of hydrophobic biocompatible and biodegradable polylactic acid (PLA). Coating the chambers with hydrophobic PLA allows for entrapment of a microair-bubble in each chamber that seals and hence drastically reduces the PEM permeability. PLA@PEM microchambers are proven to enable prolonged subaqueous storage of small hydrophilic salts and molecules such as crystalline NaCl, doxicycline, and fluorescent dye rhodamine B. The presented microchambers are able to entrap air bubbles and demonstrate a novel strategy for entrapment, storage, and protection of micropackaged water-soluble substances in precipitated form. These chambers allow triggered release as demonstrated by ultrasound responsiveness of the chambers. Low-frequency ultrasound exposure is utilized for microchamber opening and payload release.

 

Anton Galazhinskiy, a professor at the Department of higher Mathematics and Mathematical Physics, Ivan Masterov, JRF at the International Mathematical Physics Lab.

Journal: Physics Letters B (IF 4.807; Q1)

Article: N = 4 l-conformal Galilei superalgebra

An N=4 supersymmetric extension of the l-conformal Galilei algebra is constructed. This is achieved by combining generators of spatial symmetries from the l-conformal Galilei algebra and those underlying the most general superconformal group in one dimension D(2,1;α). The value of the group parameter α is fixed from the requirement that the resulting superalgebra is finite-dimensional. The analysis reveals α=−12 thus reducing D(2,1;α) to OSp(4|2).

 

Alexandra Pershina, Ass. Prof. at the Department of Biotechnology and Organic Chemistry, et al.

Journal: International Journal of Nanomedicine (IF 4.3; Q1)

Article: 3-Aminopropylsilane-modified iron oxide nanoparticles for contrast-enhanced magnetic resonance imaging of liver lesions induced by Opisthorchis felineus

The synthesized APS-modified iron oxide nanoparticles showed high efficiency as an MRI contrast agent for the evaluation of opisthorchiasis-related liver damage.

 

Adamyan G. G. (h-индекс: 31), Nikolay Antonenko, a professor at the Department of Higher Mathematics and Mathematical Physics.

Journal: Physical Review C (IF 3.82; Q1)

Article: Comparative analysis of the fusion reactions 48Ti+58Fe and 58Ni+54Fe

The experimental fusion excitation functions of the reactions 48Ti+58Fe and 58Ni+54Fe, measured down to the low sub-barrier energies, are described within the quantum diffusion approach and the universal fusion function representation. For these systems, the s-wave capture probabilities are extracted from the experimental excitation functions and are also analyzed. An enhancement of the sub-barrier fusion cross section observed in the 48Ti+58Fe reaction in comparison to the relatively close system 58Ni+54Fe is explained.

 

Antonio di Martino, a researcher at the Department of Technology of Organic substances and Polymer Materials, Olga Guselnikova, an engineer at the Department of Technology of Organic Substances and Polymer Materials, Marina Trusova, Ass. Prof. at the Department of Biotechnology and Organic Chemistry, Pavel Postnikov, Ass. Prof. at the Department of Technology of Organic Substances and Polymer Materials, et al.

Journal:  International Journal of Pharmaceutics (IF 3.649; Q1)

Article: Organic-inorganic hybrid nanoparticles controlled delivery system for anticancer drugs

The use of organic-inorganic hybrid nanocarriers for controlled release of anticancer drugs has been gained a great interest, in particular, to improve the selectivity and efficacy of the drugs. In this study, iron oxide nanoparticles were prepared then surface modified via diazonium chemistry and coated with chitosan, and its derivative chitosan-grafted polylactic acid. The purpose was to increase the stability of the nanoparticles in physiological solution, heighten drug-loading capacity, prolong the release, reduce the initial burst effect and improve in vitro cytotoxicity of the model drug doxorubicin. The materials were characterized by DLS, ζ-potential, SEM, TGA, magnetization curves and release kinetics studies. Results confirmed the spherical shape, the presence of the coat and the advantages of using chitosan, particularly its amphiphilic derivative, as a coating agent, thereby surpassing the qualities of simple iron oxide nanoparticles. The coated nanoparticles exhibited great stability and high encapsulation efficiency for doxorubicin, at over 500 μg per mg of carrier. Moreover, the intensity of the initial burst was clearly diminished after coating, hence represents an advantage of using the hybrid system over simple iron oxide nanoparticles. Cytotoxicity studies demonstrate the increase in cytotoxicity of doxorubicin when loaded in nanoparticles, indirectly proving the role played by the carrier and its surface properties in cell uptake.

 

Ecoenergy

Margarita Dmitrienko, an engineer at the Heat-Mass Transfer Simulation Lab, Galina Nyashina, an engineer at the Heat-Mass Transfer Simulation Lab, Pavel Strizhak, chair of the department of Heat Power Process Automation.

Journal: Journal of Hazardous Materials (IF 6.065; Q1)

Article: Environmental indicators of the combustion of prospective coal water slurry containing petrochemicals

Negative environmental impact of coal combustion has been known to humankind for a fairly long time. Sulfur and nitrogen oxides are considered the most dangerous anthropogenic emissions. A possible solution to this problem is replacing coal dust combustion with that of coal water slurry containing petrochemicals (CWSP). Coal processing wastes and used combustible liquids (oils, sludge, resins) are promising in terms of their economic and energy yield characteristics. However, no research has yet been conducted on the environmental indicators of fuels based on CWSP. The present work contains the findings of the research of CO, CO2, NOx, SOx emissions from the combustion of coals and CWSPs produced from coal processing waste (filter cakes). It is demonstrated for the first time that the concentrations of dangerous emissions from the combustion of CWSPs (carbon oxide and dioxide), even when combustible heavy liquid fractions are added, are not worse than those of coal. As for the concentration of sulfur and nitrogen oxides, it is significantly lower for CWSPs combustion as compared to coals. The presented research findings illustrate the prospects of the wide use of CWSPs as a fuel that is cheap and beneficial, in terms of both energy output and ecology, as compared to coal.

 

Unconventional Natural Resources

Saito A. (h-индекс: 24), Pavel Postnikov, Ass. Prof. at the Department of Technology of Organic Substances and Polymer Materials, Mekhman Yusubov, chair of the department of Organic substances and Polymer Materials, Nemykin V. N. (h-индекс: 35), Zhdankin V. V. (h-индекс: 44) et al.

Journal: Chemistry - A European Journal (IF 5.317; Q1)

Article: Preparation, Structure, and Reactivity of Pseudocyclic Benziodoxole Tosylates: New Hypervalent Iodine Oxidants and Electrophiles

New pseudocyclic benziodoxole tosylates were prepared by the treatment of 1-hydroxybenziodoxolones with p-toluenesulfonic acid or via ligand transfer reaction between PhI(OH)OTs (Koser's reagent) and substituted 2-iodobenzoic acids under mild condition. Single crystal X-ray crystallography of these compounds revealed a pseudocyclic structure with a short intramolecular interaction of 2.362?Å between oxygen and iodine in the iodoxole ring. Pseudocyclic benziodoxole tosylates readily react with various organic substrates as electrophiles or oxidants to afford the corresponding iodonium salts or the products of oxidation. Furthermore, these compounds can be used as efficient recyclable hypervalent iodine reagents. The reduced form of a pseudocyclic benziodoxole tosylate, 2-iodobenzoic acid, can be efficiently recovered from the reaction mixture by a simple acid–base liquid–liquid biphasic procedure.

 

Alexei Vedyagin, a chief expert at the Department of Physical and Analytical Chemistry, Volodin A. M. (h-index: 21), Ilya Mishakov, Ass.Prof. at the Department of Nuclear and Thermal Power Plants, et al.

Journal: Catalysis Today (IF 4.636; Q1)

Article: Effect of metal-metal and metal-support interaction on activity and stability of Pd-Rh/alumina in CO oxidation

A series of Pd-Rh/alumina catalysts with total precious metals loading of 0.2 wt.% was prepared by means of mechanical mixing of monometallic precursors and incipient wetness impregnation of the support with dual complex salt. Gamma and delta alumina supports were obtained from commercial aluminum hydroxide by calcinations at 720 and 1000 °C respectively. Supports were examined by electron paramagnetic resonance spectroscopy, low-temperature nitrogen adsorption, X-ray diffraction analysis and photoluminescence spectroscopy. It was shown that concentration of donor sites of the supports differs according to distinctions between values of their specific surface areas. Finally, the strength of metal-support interaction is getting much weaker in the case of δ-Al2O3. Bimetallic Pd-Rh species with strong metal-metal interaction supported on γ-Al2O3 were found to be characterized by superior high-temperature stability. Pd/Rh ratios of 3:2 and 7:3 were shown to be the most appropriate for this purpose.

 

Ekaterina Kolobova, a chief expert at the Department of Physical and Analytical Chemistry, Zubavichus Y. V. (h-index: 25), Alexei Pestryakov, chair of the Department of Physical and Analytical Chemistry, Bogdanchikova N. E. (h-index: 30), et al.

Journal: Molecular Catalysis (IF 4.211; Q1)

Article: n-Octanol oxidation on Au/TiO2 catalysts promoted with La and Ce oxides

This study aims to improve gold-based catalyst effectiveness in n-octanol oxidation by adjusting the structural and electronic properties of gold through incorporation of additives to support. Au/La/TiO2, Au/Ce/TiO2, and Au/TiO2 catalysts, prepared by deposition-precipitation with urea, were tested in the base-free oxidation of octanol under mild conditions in liquid phase. The influence of additives on structural properties of the catalyst and the active phase, and on the electronic and redox properties of the active gold species was studied by TEM, SR-XRD, EXAFS, FTIR of adsorbed CO, and XPS. Support modifiers affected gold particle size distribution, but no direct dependence of the catalyst activity on Au NPs average size was observed. The activity of as-prepared catalysts was limited, and even lower in the presence of modifiers at that stage. Reductive pretreatment boosted the activity of every catalyst, and support modification with La and Ce increased four- and two-fold, respectively, the activity of Au/TiO2 under the same reaction conditions. The nature of modifiers also affected the product distribution where the outstanding performance of Au/La/TiO2 gives rise to the highest ester selectivity at isoconversion with no acid formation. Overall, the studied catalysts, and especially Au/Ce/TiO2, and Au/La/TiO2, hold promise for n-octanol oxidation under mild conditions.

 

Natalia Shakhova, a leading research fellow at the International Arctic Seas Carbon Research International Lab, Igor Semiletov, a professor at the Department of Geology and Minerals Prospecting, Szidat S. (h-index: 32), Oleg Dudarev, a research fellow at the Department of Geology and Minerals Prospecting, Tison J. (h-index: 33), Rockmann T. (h-index: 36), et al.

Journal: Biogeosciences (IF 3.851; Q1)

Article: The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis

The Arctic Ocean, especially the East Siberian Arctic Shelf (ESAS), has been proposed as a significant source of methane that might play an increasingly important role in the future. However, the underlying processes of formation, removal and transport associated with such emissions are to date strongly debated.

CH4 concentration and triple isotope composition were analyzed on gas extracted from sediment and water sampled at numerous locations on the shallow ESAS from 2007 to 2013. We find high concentrations (up to 500?µM) of CH4 in the pore water of the partially thawed subsea permafrost of this region. For all sediment cores, both hydrogen and carbon isotope data reveal the predominant occurrence of CH4 that is not of thermogenic origin as it has long been thought, but resultant from microbial CH4 formation. At some locations, meltwater from buried meteoric ice and/or old organic matter preserved in the subsea permafrost were used as substrates. Radiocarbon data demonstrate that the CH4 present in the ESAS sediment is of Pleistocene age or older, but a small contribution of highly 14C-enriched CH4, from unknown origin, prohibits precise age determination for one sediment core and in the water column. Our sediment data suggest that at locations where bubble plumes have been observed, CH4 can escape anaerobic oxidation in the surface sediment.

 

Industrial Tomography

Stefano Sfarra, a research fellow at the Laboratory №34, Maldague X.P.V. (h-index: 26), et al.

Journal: International Journal of Thermal Sciences (IF 3.615; Q1)

Article: Evaluation of the state of conservation of mosaics: Simulations and thermographic signal processing

Nondestructive inspection of mosaic structures is not a novelty in the thermographic scene. Interesting works can be retrieved from scientific literature, some of them dedicated to the use of static active configurations and/or the passive approach for the inspection of plastered mosaics or the assessment of mosaic floors. In the present study, a mosaic made by synthetic tesserae of different colors depicting a dove was inspected by active thermography using a static configuration. The mosaic was manufactured with artificial defects positioned at several depths and locations, where some of them, due to their dynamic nature, enabled the monitoring of their thermal effects over time. In particular, the mosaic contains: a void into which compressed air can be injected, a sponge insert that can be soaked by a known quantity of water through an external tube, and a sub-superficial recirculation circuit from which a stream of cold or hot water can flow. The variability of the nature of these defects, simulating what happens in a real case, was conveniently modeled by numerical simulation approaches. The latter point was assessed through the aid of a simulation software, while the comparison of the results obtained by numerical analysis with those derived by thermographic testing was also performed.

 

Nagatsuma T. (h-index: 41), Igor Minin, SRF at the Department of Precious Instrument Making, et al.

Journal:  Applied Physics Letters (IF 3.411; Q1)

Article: Asymmetric phase anomaly of terajet generated from dielectric cube under oblique illumination

The terajet, a jet in the terahertz (THz, 0.1–10 THz) region, has attracted considerable research interest owing to its capability to compress beams to subwavelength hotspots. Here, we report a finding of an abnormal asymmetric Gouy phase anomaly in a terajet generated from a Teflon (n = 1.46) cube illuminated by the TM-mode oblique incidences. This asymmetric Gouy phase anomaly causes an interesting deviation angle between the normal of the phase distribution of the Gouy phase anomaly and the propagation direction of the incident beam at the position where the terajet is generated. This deviation angle exponentially decreases as THz waves propagate over several wavelengths. The output angle of the generated terajet, which is evaluated based on the experimental peak values of the amplitude distribution, shows linearity and is identical to the input angle of the incident beam. The full width at half maximum is also maintained within a wavelength for wide angles (45°) of oblique illuminations.

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