The influence of waste chromia-alumina catalyst and burning temperature on physicomechanical properties of ceramics based on fusible clay

© The Authors, published by EDP Sciences, 2017.Effect of waste Cr/Al2O3 catalyst addition to fusible charge and firing temperature on the basic properties of the fired ceramics is studied. The dependence of strength, density and water absorption on firing temperature on 960, 1060 and 1160°C is established. It is proven that increasing firing temperature up to 1160°C provides less leachability of Cr(VI) from samples and increased environmental safety of ceramics

The influence of waste chromia-alumina catalyst and burning temperature on physicomechanical properties of ceramics based on fusible clay

The influence of waste chromia-alumina catalyst and burning temperature on physicomechanical properties of ceramics based on fusible cla

Influence of limestone content, fineness, and composition on the properties and microstructure of alkali-activated slag cement

© 2016 Elsevier LtdThe influence of the fineness, concentration, and chemico-mineralogical composition of limestone on the workability, reaction kinetics, compressive strength, microstructure, and binder gel characteristics of sodium carbonate–based waste-activated waste slag cement pastes was investigated in this work. Alkali-activated slag cements incorporated with limestone, containing 33–100% of calcite, at a content of up to 60% with a 28-day compressive strength of 26.2–48.8 MPa were proposed. The main reaction products of hardened alkali-activated cement pastes and those incorporated with limestone are [Formula presented], CaCO3, Na2Ca(CO3)2·5H2O, and Na2CaSiO4. “Physically active” limestone does not chemically react with the binder gel but it can improve the physical structure. The higher packing density of mixed cement, without an increase in the water demand, the satisfactory binding strength of limestone with the binder gel lead to the improvement in the physical structure and compressive strength of alkali-activated slag paste

Modified fiber cement panels for civil construction

© The Authors, published by EDP Sciences, 2017.The authors investigated the influence of modifying agents, based on the realization of three-factor plan of the second-order, on physico-mechanical properties and durability of fiber cement boards based on cellulose fibers

Fullerene Chemistry: a New Reaction for the Synthesis of Perspective Semiconductor Materials for Organic Electronics

This work was financially supported by Russian Foundation for Basic Research (Project № 17-03-00120) and Russian Science Foundation (Project № 18-73-00084)

Hybrid Molecules Based on Fullerene C60 and Spiropyrans – Perspective Chemo- and Photosensors

This work was fulfilled within the budget topic (AAAA-A17-117012610065-2), and was financially supported by the Ministry of Education and Science of Russian Federation (Project № МК-3058.2018.3, NSh-5240.2018.3)

Molecular Design of New Hybrid Systems Based on Fullerenes and Norbornadienes

This work was fulfilled within the budget topic (AAAA-A17-117012610065-2), and financially supported by Russian Foundation for Basic Research (Project № 17-03-00120)

Influence of hydraulic compression on porosity and permeability properties of reservoirs

Active development of hard-to-recover oil reserves causes the need for an innovative approach to methods of oil recovery and intensification of its production, based on taking into account the specifics of filtration processes in low-productive reservoirs and complex geological and physical conditions. Pilot works for studying the mechanism of changes in porosity and permeability properties of reservoirs during swabbing of wells are presented. Based on the hydrodynamic investigations performed, the results of the work are analyzed. The method of oil production intensification using hydraulic compression of formation has been developed. It has been shown that when using hydraulic compression technology in the pore space of the formation, the effect of capillary and gravitational forces is strongly reduced. The influence of these forces decreases when significant pressure gradients with changing direction are formed during well swabbing for depression impact on the bottomhole zone of the formation. Hydraulic compression induced an increase in well productivity and flow rate; insights into how how permeability and porosity properties change during well swabbing were clarified. The range of compressive durability (minimum and maximum values) was determined for the Verean deposits of the Melekeskaya Depression and the South Tatar arch. The impact of formation hydraulic compression caused changes in permeability and porosity properties of the reservoir in the bottomhole zone on a qualitative level. Piezo- and hydraulic conductivity increased by 20 %. Experimental work in well 1545 of Keremetyevskoe field showed an increase of piezo- and hydraulic conductivity coefficients, effective formation thickness, change of filtration flows character

Serum cytokine signature that discriminates Helicobacter pylori positive and negative juvenile gastroduodenitis

© 2016 Khaiboullina, Abdulkhakov, Khalikova, Safina, Martynova, Davidyuk, Khuzin, Faizullina, Lombardi, Cherepnev and Rizvanov.Gastroduodenitis caused by H. pylori, often acquired in early childhood, is found in about 50% of the adult population. Although H. pylori infections can remain asymptomatic, its virulence factors usually trigger epithelial vacuolization and degeneration, loss of microvilli, disintegration of cytoplasm, and leukocyte accumulation. It is believed that leukocyte infiltration is driven by cytokines produced locally in infected tissue. However, so far little is known about changes in serum cytokines in juvenile patients infected with H. pylori. Serum cytokine profiles were analyzed in 62 juvenile patients diagnosed with gastroduodenitis using the Bio-Plex multiplex assay. H. pylori infection was confirmed in 32 patients, while 30 patients were H. pylori-free. Cytokines CXCL5 and CXCL6, potent neutrophil chemoattractants, were upregulated in all patients diagnosed with gastroduodenitis. Serum levels of IL8, a prototype neutrophil attractant, remained unchanged in subjects with gastroduodenitis relative to controls. Therefore, our data suggest that CXCL5 and CXCL6 play a role in directing neutrophil trafficking into inflamed gastroduodenal tissue. In addition, the CCL25/GM-CSF ratio differed significantly between H. pylori-positive and -negative juveniles. Further, study is needed to evaluate the role of CCL25 and GM-CSF in the pathogenesis of the different etiologies of gastroduodenitis