65 research outputs found

    Low field magnetocaloric effect and heat capacity of A-site ordered NdBaMn2O6 manganite

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    The magnetocaloric effect (MCE) in the A-site ordered manganite NdBaMn2O6 is studied. The MCE in this compound has an anomalous behavior. In low magnetic fields, the abrupt transitions between direct and inverse magnetocaloric effect are observed. In a relatively strong magnetic field H=11 kOe the direct and inverse effects are observed only at cooling, while the heating mode reveals only an inverse MCE. The value of the MCE (-{\Delta}S=0.7 J/kg K and {\Delta}S= 1.02 J/kg K for {\Delta}H=11 kOe) does not reach high values, but the proximity of the effects occurring at room temperatures expects the use of both effects in the magnetic cooling technology.Comment: 10 pages, 6 figure

    Direct and Inverse Magnetocaloric effects in A-site ordered PrBaMn2O6 manganite in low magnetic fields

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    The magnetocaloric effect (MCE) of A-site ordered PrBaMn2O6 manganite has been studied by direct methods and by the specific heat measurements. Direct measurements of the MCE in low magnetic fields were performed using recently proposed modulation technique and by classic direct method in high fields. Direct and inverse MCE are observed at Curie and Neel points correspondingly. A value of the inverse MCE in the heating run is less than in the cooling regime. This effect can be attributing to competition between ferromagnetic and antiferromagnetic interactions. Indirectly estimated and direct MCE values considerably differ in around first order AF transition.Comment: 8 pages, 5 figure

    Specific heat and magnetocaloric effect in Pr1-xAgxMnO3 manganites

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    The magnetocaloric effect in alternating magnetic fields has been investigated in Pr1-xAgxMnO3 manganites with x=0.05-0.25. The stepwise reversal of the sign of the magnetocaloric effect has been revealed in a weakly doped sample (x=0.05) at low temperatures (~80 K). This reversal is attributed to the coexistence of the ferromagnetic and canted antiferromagnetic phases with different critical temperatures.Comment: 4 pages, 4 figure

    Structure and magnetocaloric properties of La1-xKxMnO3 manganites

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    A technology of obtaining the single-phase ceramic samples of La1-xKxMnO3 manganites and the dependence of their structural parameters on the content of potassium has been described. Magnetocaloric effect (MCE) in the obtained samples has been measured by two independent methods: by classical direct methodic and by a method of magnetic field modulation. The values of MCE obtained by both methods have been substantially differed. The explanation of the observed divergences is given. The correlation between the level of doping and MCE value has been defined. The value of TC determined by the MCE maximum has been conformed to the literature data received by other methods.Comment: 14 pages, 6 figures, 3 table

    Wound dialisis offoctivity for correction of endogenic intoxicanion of pations with puss paranephritis end dinamik citokin

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    82 postoperative patient with purulent pyelonephritis and paranephritis have been followed up. The control group of 42 patients received traditional complex therapy. The basic group of 40 patients underwent wound dialysis with gelevin. The comparative analysis of our drainage method was carried on according to clinical and laboratory findings. Special attention was devoted to the dynamics of indicators. The conducted study resulted in the definition of pyosorptyon efficient, averages -18%.Под наблюдением находились 82 прооперированных больных с разными формами осторогнойного пиелонефрита и паранефрита. Из них 42 пациентов составили контрольную группу, которым проведено было традиционное комплексное лечение. Остальным 40 пациентам, которые были включены основную группу, дополнительно проведен был во время операции раневой диалез сорбентом - полисорб МП. Эти же больные получают полисорб МП и в послеоперационном периоде per os. Сравнительный анализ эффективности предложенного нами метода дренирования проводился по клинико-лабораторным данным: Си плазмы и эритроцитов, гемолиз, ЛИИ, КОЗ итд. Большое внимание было отведено к динамике показателей. В ходе проведенной нами работы определен процент эффективности пиосорбции, равный -18%

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    MANAGEMENT OF PORTFOLIO INVESTMENTS AND THEIR ROLE IN DEVELOPMENT HYDROTECHNICAL CONSTRUCTION

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    Motivated practicability shaping the portfolio investment, including securities highly profitable functioning and building hydroelectric station. It is offered situational managerial system by shaping the portfolio investment, which can provide necessary its structure in sloppy condition market
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