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Shishkin R. A.,Yuferov Y. V.,Karagergi R. P.,Schak A. V. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
The microstructural and mechanical properties of pressuless sintered SiC-based composite materials with Al or Cu addition (0–10 wt.%) were studied. The introduction of 1–2 wt.% of metals to the SiC results in appreciable porosity decreases from 31 to 19 ± 1%. Moreover, metallic aids considerably affects the phase composition of the materials. Cu suppresses the formation of mullite. In contrast, Al increases the content of the moissanite phase in the final material because of a thick oxide film on the surface of silicon carbide. However, metal content does not steadily increases due to the melt removes from the open pores during the sintering process. The hardness of the composite material mainly depends on the moissanite phase content, which could be enhanced by metal additives. Developed composite materials have up to 50 and 3 times greater resistance to abrasive and cavitation wear correspondingly than the original porous SiC.
Magnetic and magnetothermal properties of Gd75Cu25 prepared by melt-spinning
D.A. Shishkin,A.S. Volegov 한국물리학회 2020 Current Applied Physics Vol.20 No.11
Magnetic and magnetothermal properties of melt-spun Gd75Cu25 alloy were studied. A second-order magnetic phase transition is observed at the Curie temperature of 144 K. The peak value of the magnetic entropy change ΔSpk m = 7.0 J kg 1 K 1 is observed near the Curie point under the magnetic field change 0–5 T, while the refrigerant capacity is found to be 594 J kg 1. The specific heat exhibits a wide transition near the Curie temperature, and the non-magnetic contributions to the total specific heat are described using the Debye temperature ΘD = 155 K and the electronic specific heat coefficient γ = 65 mJ mol 1 K 2.
( Ivan Pchelin ),( Alexander Shishkin ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Anemia occurs early and predicts high risk of cardiovascular events and death in patients with diabetic nephropathy (DN). It may result from various factors including erythropoietin deficiency, iron and vitamin deficiencies, systemic inflammation and others. In this study we assessed the relative contribution of different pathogenic factors involved in development of anemia in patients with early stages of DN. Methods: We investigated 95 anemic patients with type 2 diabetes mellitus and chronic kidney disease (CKD) stages 1-3. Glomerular filtration rate was estimated by Cockcroft-Gault formula. Anemia was defined according to WHO criteria. To assess the pathogenic factors of anemia we measured serum levels of erythropoietin (EPO), ferritin, vitamin B12, folic acid, interleukin-1ß (IL-1ß), interleukin-6 (IL-6) and tumor necrosis factor-a (TNF-a) using immunoassay. Results: We found EPO deficiency in 46,3%, low ferritin levels - in 11,6%, vitamin B12 deficiency - in 1,1% and folic acid deficiency in 2,1% patients. The prevalence of EPO deficiency was increasing with progression of DN, while the prevalence of low ferritin levels was decreasing. Elevated serum cytokine levels were observed in the following percentage of patients: IL-1ß - 86,3%, IL-6 - 70,5%, TNF-a - 21,1%. Hemoglobin (Hb) levels correlated negatively with concentrations of these cytokines. Pearson`s correlation coefficients were as follows: r= -0,273 (Hb/IL-1ß), r= -0,500 (Hb/IL-6), r= -0,311 (Hb/TNF-a), p<0,05. After exclusion of patients with EPO, iron, vitamin B12 or folic acid deficiency the strength of correlations increased: r= -0,523 (Hb/lL-1ß), r= -0,677 (Hb/lL-6), r= -0,490 (Hb/TNF-a), p<0,05. Conclusions: The results of the study suggest that anemia in patients with early stages of DN is multifactorial. EPO deficiency and systemic inflammation are common in this group of patients. Thorough evaluation of factors leading to anemia in patients with early stages of DN should be used to improve response to treatment and outcomes.
Interaction between UN and CdCl<sub>2</sub> in molten LiCl-KCl eutectic. I. Experiment at 773 K
Zhitkov, Alexander,Potapov, Alexei,Karimov, Kirill,Shishkin, Vladimir,Dedyukhin, Alexander,Zaykov, Yury Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
The interaction between UN and CdCl<sub>2</sub> in the LiCl-KCl molten eutectic was studied at 773 K. The reaction was controlled by sampling the melt, as well as by analysis of the resulting precipitate. The process was shown to proceed according to several parallel reactions. The summary reaction was determined to have two stages: a fast one and a slow one. The 19-53% UN → UCl<sub>3</sub> conversion was obtained for the molar ratio of CdCl<sub>2</sub>/UN = 1.22-14.9. The rest of UN converts into the precipitate of complex composition (UNCl + U<sub>2</sub>N<sub>3</sub> + U<sub>4</sub>N<sub>7</sub> + UN<sub>2</sub>). The increase in the CdCl<sub>2</sub>/UN molar ratio from 1.22 to 14.9 resulted in the decrease in duration of the first "fast" stage of the process from 18 h to 1 h.
Interaction between UN and CdCl2 in molten LiCl-KCl eutectic. II. Experiment at 1023 K
Alexander Zhitkov,Alexei Potapov,Kirill Karimov,Anna Kholkina,Vladimir Shishkin,Alexander Dedyukhin,Yury Zaykov 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
The interaction between UN and CdCl2 in the LiCleKCl molten eutectic was studied at 1023 K. Thechlorination was monitored by sampling and recording the redox potential of the medium. At 1023 K thechlorination of UN with cadmium chloride in the molten LiCleKCl eutectic proceeds completely andresults in the formation of uranium chlorides. The melts of the LiCleKCleUCl3 or LiCleKCleUCl4 compositions can be obtained by the end of experiment depending on the presence of metallic cadmium inthe reaction zone. The higher the concentration of the chlorinating agent, the faster the reaction rate. At[CdCl2]/[UN] ¼ 1.65 (10% excess) the reaction proceeds to completion in about 7.5 h. At [CdCl2]/[UN] ¼ 7the complete chlorination takes 2.5e3 h.