Superconductivity in charge Kondo systems

We present a theory of superconductivity in charge Kondo systems, materials with resonant quantum valence fluctuations, in the regime where the transition temperature is comparable to the charge Kondo resonance. We find superconductivity induced by charge Kondo impurities, study how pairing of a superconducting host is enhanced due to charge Kondo centers and investigate the interplay between Kondo-scattering and inter-impurity Josephson coupling. We discuss the implications of our theory for Tl-doped PbTe, which has recently been identified as a candidate charge Kondo system.Comment: 4 pages, 4 figures; revised version; detailed discussion on the physics of Tl-doped PbTe adde

Cooperative localization-delocalization in the high Tc cuprates

The intrinsic metastable crystal structure of the cuprates results in local dynamical lattice instabilities, strongly coupled to the density fluctuations of the charge carriers. They acquire in this way simultaneously both, delocalized and localized features. It is responsible for a partial fractioning of the Fermi surface, i.e., the Fermi surface gets hidden in a region around the anti-nodal points, because of the opening of a pseudogap in the normal state, arising from a partial charge localization. The high energy localized single-particle features are a result of a segregation of the homogeneous crystal structure into checker-board local nano-size structures, which breaks the local translational and rotational symmetry. The pairing in such a system is dynamical rather than static, whereby charge carriers get momentarily trapped into pairs in a deformable dynamically fluctuating ligand environment. We conclude that the intrinsically heterogeneous structure of the cuprates must play an important role in this type of superconductivity.Comment: 14 pages, 8 figures, Proceedings of the "International Conference on Condensed Matter Theories", Quito, 2009 Int. J. Mod. Phys. B 2010 (Accepted

Charge Kondo anomalies in PbTe doped with Tl impurities

We investigate the properties of PbTe doped with a small concentration $x$ of Tl impurities acting as acceptors and described by Anderson impurities with negative onsite correlation energy. We use the numerical renormalization group method to show that the resulting charge Kondo effect naturally accounts for the unusual low temperature and doping dependence of normal state properties, including the self-compensation effect in the carrier density and the non-magnetic Kondo anomaly in the resistivity. These are found to be in good qualitative agreement with experiment. Our results for the Tl s-electron spectral function provide a new interpretation of point contact data.Comment: 5 pages, 3 figures; published versio

Электрохимическая переработка активной массы отработанных марганцево-цинковых химических источников тока

In order to process primary manganese-zinc chemical current sources, the technology for processing and separation of active mass components is optimized. The technology involves the extraction of zinc in the form of powder and in the form of coatings. Manganese compounds will be extracted in the form of manganese dioxide, while reducing the hazard class of waste to the fourth. The quantitative and qualitative composition of the electrolyte after leaching was determined by titrometric method. The highest concentration in the leaching electrolyte was observed for zinc Zn2+ and manganese Mn2+ ions, their concentrations were 34 and 41.36 g/dm3, respectively. Fe2+ iron ions were present in small amounts in the solutions. Using electrolytic processing of acid and alkaline solutions by leaching the active mass of spent manganese-zinc current sources, zinc in the form of coating was extracted.С целью переработки первичных марганцево-цинковых химических источников тока является оптимизация технологии по переработке и разделению компонентов активной массы. Технология предполагает извлечение цинка в виде порошка, так и в виде покрытий. Соединения марганца будут извлекаться в виде диоксида марганца, при этом предполагается уменьшение класса опасности отходов до четвертого. Определен количественный и качественный состав электролита после выщелачивания титрометрическим методом. Наибольшая концентрация в электролите выщелачивания наблюдалась по ионам цинка Zn2+ и марганца Mn2 их концентрация составила 34 и 41,36 г/дм3 соответственно. В небольших количествах в растворах присутствовали ионы железа Fe2+. Путем электролитической переработки кислотного и щелочного растворов выщелачивания активной массы отработанных марганцево-цинковых источников тока извлекли цинк в виде покрытия

Level and correlations of soluble suppression of tumorigenicity 2 protein in heart failure and its relationship with clinical and paraclinical characteristics of patients

Aim. To establish the correlations of the soluble suppression of tumorigenicity 2 protein (sST2) and N-terminal pro-brain natriuretic peptide (NT-proBNP) with some clinical and paraclinical characteristics of patients with heart failure (HF).Material and methods. The study included 130 patients with HF (men — 54, women — 76, mean age, 64,3±8,3 years) from the regional registry of HF patients in the Voronezh Oblast. All patients underwent echocardiography and general clinical investigations. In addition, the serum levels of sST2 and NT-proBNP were determined and their correlations with other parameters were studied.Results. The blood level of sST2 in HF patients was 339,8 [266;405] pg/ml. In the study sample of patients with HF, sST2 levels correlated with right atrial (r=0,49) and right ventricular (r=0,32) sizes, left ventricular end-diastolic dimension (r=0,34) and volume (r=0,33), left ventricular early diastolic filling rate (r=-0,35), blood calcium level (r=-0,55) and functional class of exertional angina (r=-0,37).Conclusion. The data obtained may indicate a pathogenetic relationship between sST2 and systolic and diastolic dysfunction of the left ventricle and right heart

Biomarkers ST2 and interleukin 33 for assessing the severity of cardiac inflammation and fibrosis in patients with chronic heart failure

Chronic heart failure (CHF) is a pathology that affects more than 37 million people worldwide. Despite the introduction of new drugs into practice, that have proven their effectiveness in the treatment of patients with CHF, the life expectancy of these patients is growing at a slow pace. At the same time, the insufficient effect of neurohormonal blockers for the treatment of patients with CHF with preserved ejection fraction (CHFpEF), which prevails in the general structure of CHF, indicates a significant role of unidentified pathological processes in the development of this form of the disease. In recent years, the role of cardiac fibrosis has been actively studied within the framework of the investigation of the pathogenesis of CHFpEF, the probable biomarkers of which are interleukin (IL) 33 and suppression of tumorigenicity 2 (ST2). This literature review examines the influence of the IL-33/ ST2 interaction as a biomarker of cardiac fibrosis on the course of CHF and the possibilities of its practical application