Retraction notice on the article by A.S. Zotov et al. ‘Short-Term Results of Two Strategies in Thoracoscopic Ablation for Lone Atrial Fibrillation’ doi: 10.17816/clinpract110719

Editorial board of the journal informs authors about the retraction of the article Short-Term Results of Two Strategies in Thoracoscopic Ablation for Lone Atrial Fibrillation published in Journal of Clinical Practice 13(3) 2022 by A.S. Zotov, O.Yu. Pidanov, I.S. Osmanov, A.V. Troitsky, A.A. Silaev, E.R. Sakharov, V.N. Sukhotin, O.O. Shelest, R.I. Khabazov, D.A. Timashkov. The reason for the retraction is the publication ethics violation in terms of authorship criteria. Not all authors whose names appear on the article made substantial contributions to the study drafted/revised the manuscript and approved the version to be published. Retraction made on January 09, 2023 with approve from the Editor-in-Chief

HOB BACKOFF FOR GEAR MACHINING WITH NORMAL ELLIPTIC PROFILE

The equations of the hob relief, based on the earlier dependences of the section coordinates of the elliptic tooth-wheel profile, and the equations of the hob cutting profile are defined

MULTIPLE SCATTERING OF ULTRASONIC WAVES BY SYSTEM OF 3D DEFECTS OF CANONICAL FORM (THEORY AND EXPERIMENT)

The deterministic model of the defect distribution is described. The comparative analysis of the theoretical calculation and test data of the ultrasonic wave multireflection on the system of three cylindrical defects located in the finite-size elastic body is made

Methodology of a Strategy Formation for Innovative Development of the Educational Complex in the Information Society

The article is devoted to the management of innovative development of complicated socio-economic systems. Such a system is the educational system and its institutional forms, united into the concept of “educational complex”. Models and tasks of implementing the innovative development of the non-state (commercial) and budget (state) sectors of educational complexes are shown in this work. The following principles are proposed as the basis of the concept of innovative development of education in the conditions of the information society: the maximum usage of opportunities, which are provided by the information society; assistance in the formation and development of a single information and communication space. As an example of analysis of the quality of innovative processes occurring in educational complexes, a mathematical model of a distance educational system, which is based on the methods and means of the theory of self-organization – synergetics, is proposed. It is concluded that the implementation of the methodology for managing the innovative development of the educational complex creates the prerequisites for building a quality management system for the educational process

TRIBOCHEMICAL ASPECT OF THE EFFECT HARD ALLOYS METAL ON DETERIORATION AT CUTTING

Warmth calculations of carbides and nitrides oxidation of some metals as elements of wearproof coverings define probability of formation corresponding oxide base metals under the cutting conditions. Proofness indicator (volume factor) of connections is introduced for the first time to estimate efficiency of coverings from nitrides, carbides and aluminides, formed oxides, under the cutting conditions.  Experimental data of oxidation of pure metals, double alloys, including aluminides, allow to consider that the efficiency of aluminides of Ti, Fe, Cu, Nb, Zr, Ni, correlates with their proofness indicators values.  Research of cutting firm alloys with coverings of TiC, TiN and Al2O3 in the air and in nitrogen atmosphere have confirmed  efficiency of these coverings under the  retardation (shortstop) of  tribochemical contact reactions

Stability of AuCl2− from 25 to 1000 °C at Pressures to 5000 bar and Consequences for Hydrothermal Gold Mobilization

Gold is transported in high-temperature chloride-bearing hydrothermal fluids in the form of AuCl2−. The stability of this complex has been extensively studied, but there is still considerable disagreement between available experimental data on the temperature region 300–500 °C. To solve this problem, we measured the solubility of gold in HCl/NaCl fluids (NaCl concentration varied from 0.1 to 3 mol·(kg H2O)−1) at 450 °C and pressures from 500 to 1500 bar (1 bar = 105 Pa). The experiments were performed using a batch autoclave method at contrasting redox conditions: in reduced experiments hydrogen was added to the autoclave, and in oxidized experiments the redox state was controlled by the aqueous SO2/SO3 buffer. Hydrogen pressure in the autoclaves was measured after the experiments in the reduced system. The gold solubility constant, Au(cr) + HCl°(aq) + Cl− = AuCl2− + 0.5 H2°(aq), was determined for the experimental T-P parameters as log Ks° = −4.77 ± 0.07 (500 bar), −5.11 ± 0.08 (1000 bar), and −5.43 ± 0.09 (1500 bar). These data, together with values from the literature for temperatures from 25 to 1000 °C, were fitted to the simple equation log Ks° = 4.302 − 7304·T(K)−1 − 4.77·log d(w) + 11080·(log d(w))·T(K)−1 − 6.94·106·(log d(w)) T(K)−2, where d(w) is the pure water density. This equation can be used together with the extended Debye–Hückel equation for activity coefficients to calculate gold solubility at pressures up to 5000 bar at fluid chlorinities at least up to 30 wt %. The speciation of gold in natural chloride-bearing fluids is discussed

Sapphire-based medical instruments for diagnosis, surgery and therapy

In this work, we present a brief overview of sapphire medical instruments. Sapphire demonstrates a unique combination of physical properties, such as high hardness and chemical inertness, biocompatibility and high thermal conductivity, high transparency in a wide spectral range that makes it suitable for various medical applications. We demonstrate the examples of scalpel, capillary needle for laser therapy, neuroprobe and applicator for cryosurgery. Each of them combines different modalities in one instrument. Among them are tissue resection, therapy via electromagnetic wave delivering, aspiration, diagnosis, and tissue freezing. Sapphire instruments can be accompanied with magnetic resonance imaging and allow multiple sterilization

Feasibility test of a sapphire cryoprobe with optical monitoring of tissue freezing

This article describes a sapphire cryoprobe as a promising solution to the significant problem of modern cryosurgery that is the monitoring of tissue freezing. This probe consists of a sapphire rod manufactured by the edge-defined film-fed growth technique from Al2O3 melt and optical fibers accommodated inside the rod and connected to the source and the detector. The probe's design enables detection of spatially resolved diffuse reflected intensities of tissue optical response, which are used for the estimation of tissue freezing depth. The current type of the 12.5-mm diameter sapphire probe cooled down by the liquid nitrogen assumes a superficial cryoablation. The experimental test made by using a gelatin-intralipid tissue phantom shows the feasibility of such concept, revealing the capabilities of monitoring the freezing depth up to 10 mm by the particular instrumentation realization of the probe. This justifies a potential of sapphire-based instruments aided by optical diagnosis in modern cryosurgery