Foam Metals High-Temperature Electrical Characteristics’ Investigation

In the work presented we have carried out experimental investigations of high- temperature electrophysical properties of foam metals. We have obtained data of foam nickel and foam copper resistivity and temperature coefficients of resistance (TCR) versus their plane deformation degree within the temperature range from 100 to 950 ºС

Characteristic Features of Ethnic Labor Migration in the Krasnoyarsk Krai (Central Siberia, Russia)

This research is devoted to the analysis of some aspects of ethnic labor mobility in Krasnoyarsk Krai. The main method of research is a quantitative survey, including the interpretation of the quantitative results. Currently, Krasnoyarsk Krai (Central Siberia, Russia) is a zone of active ethnic labor mobility. The majority of the ethnic migrant workers are from Central Asia (Tajikistan, Uzbekistan, Kyrgyzstan). Ethnic labor mobility from Armenia and Azerbaijan is decreasing. The hosts, the residents of the Krasnoyarsk Krai, are experiencing a range of phobias towards the labor immigrants (xenophobia and migrant-phobia). For the harmonization of relationships between migrants and the hosts, preventative measures should be taken to prevent possible confl icts, including constant monitoring of the situation. The study shows that students and youth of the Siberian Federal University have a positive attitude toward people who are engaged in labor mobility. Political management should take the complex structure of the host into the account and be ready to regulate diffi cult intercultural relationships between the people of Krasnoyarsk Krai and the people who come there from Central Asia and other countries. Keywords: Krasnoyarsk Krai, Ethnic Labor Mobility, Strategies of Acculturation, Cultural Integration JEL Classifications: J15, J61, R12, Z1

Betulin attenuated liver damage by prevention of hepatic mitochondrial dysfunction in rats with alcoholic steatohepatitis

Betulin, a pentacyclic triterpene, possesses antioxidant, anti-inflammatory and hepatoprotective properties. The aim of this study was to evaluate the impact of liver mitochondria in hepatoprotection of betulin using a rat model of alcoholic steatohepatitis induced by ethanol administration (4 g/kg, intragastric) for 8 weeks. The treatment with betulin (50 and 100 mg/kg b.w., intragastric) during this period attenuated the histological signs of steatohepatitis and lowered the serum and liver triglyceride contents, as well as the serum activities of aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase. Betulin (100 mg/kg) decreased the liver/body weight ratio and inhibited the increase in the serum levels of TNFα, IL-1β, TGFβ, and hyaluronic acid, demonstrating hepatoprotective, anti-inflammatory, and antifibrotic potential. Betulin also inhibited the formation of superoxide anions in mitochondria and the end-products of lipid peroxidation in liver tissue, the amount of which was significantly increased in ethanol-treated rats. The disturbances in mitochondrial respiration, uncoupling of oxidative phosphorylation and decreasing of mitochondrial complex I, II, and IV activities in rats with steatohepatitis, were reverted by betulin administration. The increased susceptibility of mitochondria to Ca2+-induced permeability transition pore formation in the hepatitis group was improved in rats treated with betulin. In conclusion, betulin, having antioxidant properties, exerts a beneficial effect in the rat model of alcoholic steatohepatitis via prevention of liver mitochondria dysfunction, which may be attributed to the inhibition of mitochondrial permeability transition

Investigation of Electric Characteristics of Contact Assemblages with a Powder Damping Interlayer

In our work there were investigated thermal electrophysical characteristics of coaxial contact assemblages, made of a steel current carrying rod, steel or cermet sleeve and filled with an iron or nichrome powder. As a result of heating up to 950 ºС the iron powder was shown to be sintered and develop a highly conductive and damping medium that can be used for making contact junctions of materials having very different linear expansion coefficients

Investigation of Electrical Characteristics of High Temperature Ceramic-Metal Contact Assemblages

There was carried out research work on electrical technical characteristics of contact assemblages made of materials with very diverse linear expansion coefficients (LECs) at temperatures up to 900°С and current loads of long-durations up to 100 hours. Foam nickel was employed as a conductive damping material. After being subjected to long current and heat loads contact junctions between the foam nickel and contact assemblage materials were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis

Electrophysical and physical-mechanical properties of the composite SnO2-Ag (semiconductor-metal) ceramic material

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.We investigated the physical and electrical properties of ceramics based on SnO2-Sb2O3-AgO. Electrical properties were investigated in the temperature range 20-1000 0K. It is shown that in the temperature range 200-450 0K dependence of the electrical resistivity ceramics with temperature shifts from an exponential curve to another, characterized by a high electrical resistivity. This is explained by the closure of the mesh silver percolation channels formed in the synthesis of ceramics

Electrophysical and physical-mechanical properties of the composite SnO2-Ag (semiconductor-metal) ceramic material

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.We investigated the physical and electrical properties of ceramics based on SnO2-Sb2O3-AgO. Electrical properties were investigated in the temperature range 20-1000 0K. It is shown that in the temperature range 200-450 0K dependence of the electrical resistivity ceramics with temperature shifts from an exponential curve to another, characterized by a high electrical resistivity. This is explained by the closure of the mesh silver percolation channels formed in the synthesis of ceramics

Adsorptive and catalytic properties of nepheline mud

Aluminium production is accompanied by formation of ecologically dangerous gases (HF, SO2, CO, etc). There is offered the method of purification of waste gases from ecologically dangerous components. This method is concluded in their adsorption on nepheline mud, which is alumina production waste from nepheline ore. Nepheline mud is formed during the leaching from sintered material of sodium alluminate, whereupon it has a highly developed surface, similar to the zeolite surface. Dicalcium silicate (Ca2SiO4) is the basis (85%) of nepheline mud. Nepheline mud contains 3.5% of iron oxides, which, together with highly-developed surface, gives it the catalytic properties. Dicalcium silicate can react with flourhydric acid and sulphur acids with formation of fluorite and calcium sulphate. Adsorptive and catalytic abilities of nepheline mud were investigated by anode gas drawing from Söderberg electrolyzers threw the mud layer in the socket (70 mm diameter) with the rate of 8 l/min. The socket contained 300 g of dry nepheline mud. 21 testings were carried out (2 hours each). The total volume of the gas, drawn threw the socket, was 20 260 l. The composition of HF, SO2 and СО in gases at the input and output of the socket was analyzed. The following averaged results were obtained according to the carried out testings. The content of HF in gases was reduced from 428 at the input of the socket to 4.9 mg/m3 at the output of the socket (98.85% of HF were adsorbed by mud). Content of SO2 was reduced from 730 to 36.3 mg/m3 (95% was adsorbed). As a result of the catalytic properties of nepheline mud, and the process of oxidation of carbon monoxide, its content in gases was reduced from 5960 to 46.5 mg/m3 (approximately by 100 times). The offered method may be used by aluminium plants for anode gas purification and for deep gas purification from harmful impurities before their atmospheric emission

Adsorptive and catalytic properties of nepheline mud

Aluminium production is accompanied by formation of ecologically dangerous gases (HF, SO2, CO, etc). There is offered the method of purification of waste gases from ecologically dangerous components. This method is concluded in their adsorption on nepheline mud, which is alumina production waste from nepheline ore. Nepheline mud is formed during the leaching from sintered material of sodium alluminate, whereupon it has a highly developed surface, similar to the zeolite surface. Dicalcium silicate (Ca2SiO4) is the basis (85%) of nepheline mud. Nepheline mud contains 3.5% of iron oxides, which, together with highly-developed surface, gives it the catalytic properties. Dicalcium silicate can react with flourhydric acid and sulphur acids with formation of fluorite and calcium sulphate. Adsorptive and catalytic abilities of nepheline mud were investigated by anode gas drawing from Söderberg electrolyzers threw the mud layer in the socket (70 mm diameter) with the rate of 8 l/min. The socket contained 300 g of dry nepheline mud. 21 testings were carried out (2 hours each). The total volume of the gas, drawn threw the socket, was 20 260 l. The composition of HF, SO2 and СО in gases at the input and output of the socket was analyzed. The following averaged results were obtained according to the carried out testings. The content of HF in gases was reduced from 428 at the input of the socket to 4.9 mg/m3 at the output of the socket (98.85% of HF were adsorbed by mud). Content of SO2 was reduced from 730 to 36.3 mg/m3 (95% was adsorbed). As a result of the catalytic properties of nepheline mud, and the process of oxidation of carbon monoxide, its content in gases was reduced from 5960 to 46.5 mg/m3 (approximately by 100 times). The offered method may be used by aluminium plants for anode gas purification and for deep gas purification from harmful impurities before their atmospheric emission

Investigation of Physical-mechanical and Electric Properties of Conducting SnO2-based Ceramics

In our paper there are presented results of the investigation of physical-mechanical and electric properties of conducting ceramics based on SnO2-Sb2O3-CuO-system with superdispersed additives of metal oxides produced by pyrolysis of their water-soluble salts.В работе представлены результаты исследований физико-механических и электрофизических характеристик керамик на основе SnO2-Sb2O3-CuO с ультрадисперсными добавками широкого диапазона оксидов металлов, полученных в результате пиролиза их водорастворимых солей