Mineral-petrochemical wallrock alteration of rocks in Bericul gold-ore deposit (Kuznetsk Alatau)

The distribution of mineral associations in near-veined zonal propylite-beresite metasomatic columns of mesothermal Bericul gold-ore deposit was analyzed. However, the polymineral composition in the inner (axial and adjacent with it rear) zones is inconsistent to the existing metasomatic column theoretical model. According to Korzhinskii metasomatic zoning theory, implied monomineral (quartz) and binary-mineral (quartz, sericite) compositions are characteristic of axial and rear zones, respectively. In common with above-mentioned facts, the zoning formation of differential component mobility is influenced by two additional factors: counter diffusion of components from fractured fluids into pores and diffusion mechanism of mass transfer it's from pores fluids into fractured of rock-fluid systems

Model of Optimal Planning of Development of State Information Systems in the Face of Multicriteria and Uncertainty

Information technology has become an integral part of the activities of authorities. One of the main elements of the ecosystem of the digital economy, including the infrastructure of the electronic government of the Russian Federation, are federal and regional state information systems. Only in St. Petersburg, as in the subject of the Russian Federation, 68 GISs operate, a limited budget determines the need for their rational distribution, taking into account the importance, complexity, impact on other systems. This determines the need for planning the distribution of costs of the city budget for their creation, maintenance and modernization. The task of defining such a plan can be considered as a decision making task. The article considers the issue of developing a generalized mathematical model of optimal planning under conditions of multicriteria and uncertainty

Wave-vector dependent intensity variations of the Kondo peak in photoemission from CePd3_3

Strong angle-dependent intensity variations of the Fermi-level feature are observed in 4d - 4f resonant photoemission spectra of CePd$_3$(111), that reveal the periodicity of the lattice and largest intensity close to the Gamma points of the surface Brillouin zone. In the framework of a simplified periodic Anderson model the phenomena may quantitatively be described by a wave-vector dependence of the electron hopping matrix elements caused by Fermi-level crossings of non-4f-derived energy bands

METHODS OF SURGICAL PREVENTION OF THE ISCHEMIC STROKE

Objective: to estimate the clinical safety of open and endovascular interventions in the carotid arteries in the treatment and prevention of ischemic stroke.Material and methods: 317 patients (61 women and 256 men) aged 41 to 82 were examined. Carotid endarterectomy (CEA) (Group 1) was performed in 246 patients. Carotid transluminal balloon angioplasty with stenting (CAS) (Group 2) was performed in 71 patients. Symptomatic stenosis of the internal carotid artery (ICA) was detected in 85 patients (in Group1 in 53 patients, in Group2 in 32 patients). Asymptomatic stenosis of the ICA was detected in 232 patients (in Group1 in 193 patients, in Group2 in 39 patients).Results: in the immediate postoperative period in Group 1 of patients 15 complications (6,1%) developed. Ischemic stroke was stated in 8 cases (3,3%), 3 of which were lethal (1,2%). Transient ischemic attack was observed in 2 patients (0,8%). Myocardial infarction developed in 5 cases (2,0%). In the immediate postoperative period in the Group 2 of patients 4 complications (5,6%) was observed. Complications were demonstrated as an ischemic stroke in 2 cases (2,8%), myocardial infarction - in 1 observation (1,4%), a transient ischemic attack - in 1 patient (1,4%). In 1 observation (1,4%) there was a fatal outcome due to myocardial infarction in the background of hemorrhagic shock because of bleeding from an unidentified source. In the late postoperative period 12 complications developed in Group 1 of patients (6,0%). Th e restenosis of the operatedICA was observed in 8 cases (4,0%). An ipsilateral ischemic stroke was registered in 2 cases (1%). A myocardial infarction was stated in 2 cases (1%). A fatal outcome occurred in 3 cases (1,5%). In the late postoperative period 4 complications (6,8%) developed in Group 2 of patients. The restenosis of the operated ICA was stated in 1 observation (1,7%). A contralateral ischemic stroke was observed in 2 patients (3,4%). A myocardial infarction was registered in 1 observation (1,7%). A fatal outcome resulted from a myocardial infarction occurred in 1 case (1,7%).Conclusions: CEA and CAS of carotid arteries have the same effi cacy and safety in the immediate and late postoperative periods

CeFePO: f-d hybridization and quenching of superconductivity

Being homologue to the new, Fe-based type of high-temperature superconductors, CeFePO exhibits magnetism, Kondo and heavy-fermion phenomena. We experimentally studied the electronic structure of CeFePO by means of angle-resolved photoemission spectroscopy. In particular, contributions of the Ce 4f-derived states and their hybridization to the Fe 3d bands were explored using both symmetry selection rules for excitation and their photoionization cross-section variations as a function of photon energy. It was experimentally found - and later on confirmed by LDA as well as DMFT calculations - that the Ce 4f states hybridize to the Fe 3d states of d_{3z^2-r^2} symmetry near the Fermi level that discloses their participation in the occurring electron-correlation phenomena and provides insight into mechanism of superconductivity in oxopnictides.Comment: 5 pages, 3 figure

Dispersion of a single 4f4f impurity state in photoemission spectra of Yb/W(110)

Angle-resolved photoemission spectra of a monolayer of Yb on W(110) reveal energy splittings and dispersion of the Yb 4f states that are obviously due to their hybridization with W-derived valence bands. These effects occur at well defined points of the surface Brillouin zone although a smearing over reciprocal space is expected from the structural incoherence of the Yb and W lattices. We conclude therefore that dispersion is not related to the periodic arrangement of the $4f$ states but reflects the k-dependent interaction of a single Yb 4f impurity with W bands.Comment: 7 pages, 4 figure

Regarding the standardization of L-arginine and thiotriazoline in the model mixture by high-performance liquid chromatography

Today, one of the main causes of disability and mortality in the world's population is the disease of the cardiovascular and central nervous systems. Therefore, the development of new highly effective drugs for their treatment becomes an urgent task of modern medicine and pharmacy. Promising in this direction is the creation of a new medicinal product, which combines the active donor NO – neurotransmitter amino acid L-arginine, as well as the famous domestic antioxidant – thiotriazoline. A rational dosage form – pills was chosen to create a new combined drug. Therefore, the actual and timely task is to develop methods for standardizing the active substances in the model mixture, which in future can become the basis for the analysis of the finished dosage forms of the new drug. The purpose of the work is to develop a method for standardizing the model mixture of L-arginine and thiotriazoline in the ratio of 4:1 by HPLC method. Materials and methods. During the research, certified substances L-arginine (manufacturer: Sigma-Aldrich, USA) and thiotriazolin (manufacturer State Enterprise “Chemical Reagents Plant” of the Scientific-Technological Complex “Institute of Single Crystals” of the National Academy of Sciences of Ukraine) were used. The research was carried out using LC-20 Prominence Shimadzu Chromatograph. Results. First, in the laboratory, six series of model mixture of L-arginine and thiotriazoline were produced in an optimum ratio of 4:1. Continuously, the test solution and the solution of the working standard sample, were chromatographed obtaining at least three chromatograms for each solution. It is established that the content of L-arginine in the model mixture ranges from 198.38 mg to 200.66 mg, and thiotriazoline is from 50.82 mg to 51.61 mg. According to the content of the active substances, the studied series of model mixture of L-arginine and thiotriazoline in a ratio of 4:1 correspond to the requirements of the SPF. Conclusions. In the course of the conducted researches the method of standardization of active substances of the model mixture of L-arginine and thiotriazoline in a ratio of 4:1 by the HPLC method, which is reproducible, accurate and can be used later in the quality control of the established tablet formulation, has been developed

BIOCIDAL POLYAMPHOLYTES WITH GUANIDINIUM AND CARBOXY GROUPS

This work is supported by the Russian Science Foundation (research project No. 23-23-00073). Analytical, spectroscopic, and biological studies were carried out using the equipment of the Core Facilities Center "Research of materials and matter" at the PFRC UB RAS