BVBV-structure on Hochschild cohomology for exceptional local algebras of quaternion type. Case of even parameter

We give a full description of the $BV$-structure on the Hochschild cohomology of exceptional local algebras of quaternion type, defined by parameters $(k,0,d)$ in case of even parameter $k \geqslant 3$, according to Erdmann's classification. We develop and use the method of comparison morphisms and weak self-homotopy method. This article states as a generalization of similar results about $BV$-structures on Hochscild cohomology of algebras of quaternion type.Comment: 25 page

Development and approbation of a mobile test bench for mechanical uniaxial compression testing of biological tissues

A technique and a prototype of a mobile test bench for conducting experiments on uniaxial compression of biological tissue samples have been developed. The test bench consists of high-precision scales, an electronic caliper with modified grips, and a video camera. With the help of the test bench, a series of experiments (120 in total) was carried out to determine Young's modulus of atherosclerotic plaques and vascular walls removed from the human body no later than a few hours. A database of plaques and artery walls' mechanical characteristics, as close as possible to their real strength properties, has been formed. In addition, regression dependencies linking Hounsfield units and Young’s moduli of atherosclerotic plaques were constructed. The uniaxial compression technique has been verified on the Instron 3342 universal testing machine. Also, to demonstrate the applicability of the developed technique and test bench for uniaxial compression of hard tissues, experiments were conducted with 14 samples of bovine spongy bone

Classical and cubic Rashba effect in the presence of in-plane 4f magnetism at the iridium silicide surface of the antiferromagnet GdIr2Si2

We present a combined experimental and theoretical study of the two-dimensional electron states at the iridium-silicide surface of the antiferromagnet GdIr2Si2 above and below the Ned temperature. Using angle-resolved photoemission spectroscopy (ARPES) we find a significant spin-orbit splitting of the surface states in the paramagnetic phase. By means of ab initio density-functional-theory (DFT) calculations we establish that the surface electron states that reside in the projected band gap around the (M) over bar point exhibit very different spin structures which are governed by the conventional and the cubic Rashba effect. The latter is reflected in a triple spin winding, i.e., the surface electron spin reveals three complete rotations upon moving once around the constant energy contours. Below the Ned temperature, our ARPES measurements show an intricate photoemission intensity picture characteristic of a complex magnetic domain structure. The orientation of the domains, however, can be clarified from a comparative analysis of the ARPES data and their DFT modeling. To characterize a single magnetic domain picture, we resort to the calculations and scrutinize the interplay of the Rashba spin-orbit coupling field with the in-plane exchange field, provided by the ferromagnetically ordered 4f moments of the near-surface Gd layer

Divalent EuRh2Si2 as a reference for the Luttinger theorem and antiferromagnetism in trivalent heavy-fermion YbRh2Si2

Application of the Luttinger theorem to the Kondo lattice YbRh2Si2 suggests that its large 4f-derived Fermi surface (FS) in the paramagnetic (PM) regime should be similar in shape and volume to that of the divalent local-moment antiferromagnet (AFM) EuRh2Si2 in its PM regime. Here we show by angle-resolved photoemission spectroscopy that paramagnetic EuRh2Si2 has a large FS essentially similar to the one seen in YbRh2Si2 down to 1 K. In EuRh2Si2 the onset of AFM order below 24.5 K induces an extensive fragmentation of the FS due to Brillouin zone folding, intersection and resulting hybridization of the Fermi-surface sheets. Our results on EuRh2Si2 indicate that the formation of the AFM state in YbRh2Si2 is very likely also connected with similar changes in the FS, which have to be taken into account in the controversial analysis and discussion of anomalies observed at the quantum critical point in this system

Estimations des dimensions homologiques de produits fibrés d'anneaux

Ce travail est consacré à l'étude des propriétés homologiques de produits fibrés d'anneaux. Soit R le produit fibré de deux anneaux. Cette thèse se décompose en trois chapitres. Le premier chapitre comprend quelques préliminaires. Dans le chapitre 2, nous obtenons des estimations des dimensions homologiques de R-modules. Nous commençons par généraliser les critères d'injectivité, de projectivité et de platitude de R-modules de A. Facchini et P. Vamos. En nous appuyant sur ces critères, nous démontrons des estimations des dimensions injective, projective et plate du R-module M, dont deux généralisent les résultats de S. Scrivanti au cas des anneaux non commutatifs. A l'aide de ces résultats, nous établissons dans le chapitre 3 des estimations des dimensions globale, faible et finitistes de l'anneau R. Nous donnons deux exemples de produits fibrés d'anneaux et calculons leurs dimensions homologiques.BESANCON-BU Sciences Staps (250562103) / SudocSudocFranceRussian FederationFRR

Analysis of Modern Organizational and Information Technologies in the Management of Professional Health and Professional Longevity

At present, great importance is attached to the problem of maintaining the professional health of the working-age population and prolonging professional longevity in the world and in the Russian Federation. This problem has become especially urgent in recent years, in connection with the change in the country's retirement age

Aspects of design antennas for radio occultation method of ionosphere diagnostics

The ionosphere is the ionized part of Earth's upper atmosphere, from about 60 km to 1,000 km altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation. It plays an important role in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth. The region below the ionosphere is called neutral atmosphere, or neutrosphere. In this paper aspects of design antennas for radio occultation method of ionosphere diagnostics are presented

Development of methodology and technologies for managing the health of people employed at life support enterprises and a continuous cycle in pandemic conditions

The relevance of the study is due to the urgent need to develop a health management system for workers employed at life support and continuous cycle enterprises in the conditions of the new coronavirus infection (COVID-19). Subject of research: health management system for employees of life support and continuous cycle enterprises in the conditions of the pandemic. Objective: to develop approaches to human capital management at life-support and continuous cycle enterprises, excluding the possibility of downtime due to attrition (sick and quarantined staff) during pandemics and avoiding the risk of mass infection of workers with repeated waves of epidemics. Scientific novelty is determined by the development of new methods and technologies of the occupational health management system for workers at life support and continuous cycle enterprises in the conditions of pandemics. The study was conducted at RANEPA in 2021, using a set of analytical methods, questionnaires and programming. Methods: observation; surveys, system analysis, socio-economic analysis; comparative legal analysis; theory of multi-agent systems; formal analysis of historical phenomena; elements of the theory of expert systems, database creation. Results: Data from the analysis of the compliance of legal relations and international experience in managing workers’ health and the specifics of the organization of life support and continuous cycle enterprises during the COVID-19 pandemic; A model regulation on the health management service of life support and continuous cycle employees; A methodology for sociological research of organizational approaches by the subjects of the Russian Federation to ensure operation of continuous cycle enterprises in the conditions of increased emergency preparedness; Methodology of expert evaluation of investment projects in the field of workers’ health protection of workers and health management of workers at life support and continuous cycle enterprises during the actual pandemics; Methodological recommendations; Computer program "Interactive testing of knowledge in the field of healthy lifestyle, environmental well-being and prevention of coronavirus infectio