Petersburg Nuclear Physics Institute

The article presents information about the biography and professional path of Corresponding Member of the Russian Academy of Sciences, Professor, Doctor of Medical Sciences, Professor of the Department of Nervous Diseases, M.M. Odinak, dedicated to his 80th anniversary.

The article presents a theoretical and methodological analysis of the category of "pedagogical accompaniment" as a system-forming concept of the modern educational paradigm in the context of a production and research cluster. Accompaniment is considered as an integral pedagogical system that ensures the synergy of personal and professional development of a specialist through the creation of a specially organized educational environment. Based on a historical and pedagogical analysis, five stages of the evolution of the concept are identified, its essential characteristics are revealed: processuality, prolongation, reflexivity, individualization, resourcefulness, dialogicity, contextuality, axiologicality. The principles of organizing accompaniment in a cluster are formulated: anticipatory response, resource sufficiency and network interaction. The specifics of accompaniment in a cluster environment are described, including multi-subjectivity, poly-contextuality, practice-oriented approach, research and innovation orientation. A system of criteria and indicators for the effectiveness of accompaniment has been developed, covering professional competence, personal maturity, social adaptability, professional identity, innovative potential and career mobility. The results of the study create a methodological basis for designing a conceptual model of accompaniment that is adequate to the challenges of the modern innovation economy.

Transparent conductive SnO2 films, promising for application in electronic engineering, were obtained by sol–gel synthesis via mixing SnCl2∙2H2O and NH4F solutions, followed by deposition onto glass substrates by centrifugation and heat treatment at 450 °C. The physicochemical processes of SnO2 crystallization in water–alcohol solutions of SnCl2 were analyzed depending on the concentration of the crystallization initiator NH4F and the alcohols used. The sol–gel processing of the thin films was investigated using a Latin square approach. Three factors affecting the film formation conditions were varied at three levels to determine the best combination of film properties involving the maximum transparency and lowest specific electrical resistance. The effect of solvent type (ethanol, 1-butanol and isopropanol), the amount of introduced fluorine (5, 10, and 15 at. %) and the number of deposited layers (10, 15, and 20) on the composition, morphology, crystallization features, transparency and specific surface resistance of the synthesized thin films was studied. The obtained films of ~200–340 nm thickness exhibited ~78%–95% transparency in the visible spectrum range and specific surface resistance (ρs) from ~109 to >1012 Ω/sq. The optimal combination of thin (~250 μm) SnO2<Sn> film target performances including transparency 84% and specific surface resistance ~109 Ω/sq. was achieved in the case of their preparation in isopropanol with an average concentration of NH4F (10 at. % F) and spin-on deposition of 20 layers.

If axions simultaneously have the scalar couplings to the nucleons and pseudoscalar couplings to the electrons, it may mediate a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mi mathvariant="script">P</a:mi> </a:math> , <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"> <d:mi mathvariant="script">T</d:mi> </d:math> -violating interaction between the electronic shell and nuclei in the molecules. The polyatomic molecule RaOH, which is considered a promising platform for the <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:mi mathvariant="script">P</g:mi> </g:math> , <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mi mathvariant="script">T</j:mi> </j:math> -violation searches, is studied for its sensitivity to such interactions. Because of the long-range nature (on molecular scales) of the axion-mediated interaction, it is important whether the molecular parameter is sensitive to the vibration of the molecule. Our results imply that the impact of the vibrations on the axion-mediated electron-nucleon interaction in the molecule is similar to the impact on the short-range electron-nucleon scalar-pseudoscalar interaction studied earlier.

The main goals of the Multi-Purpose Detector (MPD) at Nuclotron-based Ion Collider Facility (NICA, Dubna, Russia) are the investigation of the phase diagram of QCD matter at high baryon densities and search for transition of nuclear matter into a deconfined state of quarks and gluons, known as the Quark–Gluon Plasma (QGP). The installation of the forward tracking detector in MPD would extend kinematic range to higher rapidities, which is critical for the studies of various observables that can be used to probe the properties of the produced matter. In this work, we present a brief summary of the physics motivation for the forward detector. In addition, we outline an implementation of track reconstruction with the ACTS package (“A Common Tracking Software”) and present the first results of feasibility studies aimed at optimization of the detector geometry.

ABSTRACT Foaming prepolymer compositions were synthesized on the basis of 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride (BTDA) esterified with ethanol, 4,4′‐methylenedianiline (MDA), and various amounts of single‐walled carbon nanotubes (SWCNT). These prepolymers modified with nanotubes were used as foaming binding agents to obtain new polyimide composite materials (foam composites) reinforced with carbon‐containing polyimide fibers Arimid. The results of comparative studies of thermal and mechanical properties of the obtained nano‐modified foam composites are presented. The investigated samples demonstrated high thermal stability (the onset of mass loss was observed at 546°C–555°C) and low density (0.23–0.24 kg/m 3 ); the values of flexural modulus of elasticity varied from 147 to 260 kPa, the longitudinal and transverse compression moduli were equal to 35–70 and 5–7 MPa, respectively. It was shown that the prepared foam composites were fire resistant. The samples retained their characteristics at −50°C without any increase in brittleness or deterioration of their mechanical properties, which makes them suitable for use in building structures operated in northern regions.