Hypercommutative operad as a homotopy quotient of BV

We give an explicit formula for a quasi-isomorphism between the operads Hycomm (the homology of the moduli space of stable genus 0 curves) and BV/$\Delta$ (the homotopy quotient of Batalin-Vilkovisky operad by the BV-operator). In other words we derive an equivalence of Hycomm-algebras and BV-algebras enhanced with a homotopy that trivializes the BV-operator. These formulas are given in terms of the Givental graphs, and are proved in two different ways. One proof uses the Givental group action, and the other proof goes through a chain of explicit formulas on resolutions of Hycomm and BV. The second approach gives, in particular, a homological explanation of the Givental group action on Hycomm-algebras.Comment: minor corrections added, to appear in Comm.Math.Phy

Use of bug tracking systems in education

В статье рассматривается возможность использования систем отслеживания ошибок(BTS) в учебном процессе. Дается общее понятие BTS и приводятся их преимущества при использовании как на производстве, так и в учебном процессе.In the article are discussed the possibility of using bug tracking systems (BTS) in the learning process. Also, given the general concept of BTS, their advantages when used as in the workplace and in the educational process

Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization

Heterostructures composed of ferromagnetic La0.7Sr0.3MnO3, ferromagnetic SrRuO3, and superconducting YBa2Cu3Ox were studied experimentally. Structures of composition Au/La0.7Sr0.3MnO3/SrRuO3/YBa2Cu3Ox were prepared by pulsed laser deposition, and their high quality was confirmed by X-ray diffraction and reflectometry. A non-collinear magnetic state of the heterostructures was revealed by means of SQUID magnetometry and polarized neutron reflectometry. We have further observed superconducting currents in mesa-structures fabricated by deposition of a second superconducting Nb layer on top of the heterostructure, followed by patterning with photolithography and ion-beam etching. Josephson effects observed in these mesa-structures can be explained by the penetration of a triplet component of the superconducting order parameter into the magnetic layers.Comment: 10 pages, 6 figure

Synthesis of 2-((3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate

Will be discussed synthesis of 2-((3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate.The work was supported by an RFBR grant 19-43-590023

Synthesis of 2-((3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo [b] thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate

2-((3-(Ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate has been synthesized by the reaction of ethyl (E)-2-((5-(4-methoxyphenyl)-2-oxofuran-3(2H)-ylidene)amino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate or 2-((3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate with potassium tert-butoxide. © 2022 Author(s).The work was done with the financial support of the Russian Foundation for Basic Research (project no. 19-43-590023)

Coupling of the lattice and superlattice deformations and hysteresis in thermal expansion for the quasi one-dimensional conductor TaS3_3

An original interferometer-based setup for measurements of length of needle-like samples is developed, and thermal expansion of o-TaS$_3$ crystals is studied. Below the Peierls transition the temperature hysteresis of length $L$ is observed, the width of the hysteresis loop $\delta L/L$ being up to $5 \cdot 10^{-5}$. The behavior of the loop is anomalous: the length changes so that it is in front of its equilibrium value. The hysteresis loop couples with that of conductivity. The sign and the value of the length hysteresis are consistent with the strain dependence of the charge-density waves (CDW) wave vector. With lowering temperature down to 100 K the CDW elastic modulus grows achieving a value comparable with the lattice Young modulus. Our results could be helpful in consideration of different systems with intrinsic superstructures.Comment: 4 pages, 3 figures. Phys. Rev. Lett., accepted for publicatio

The Problem of Quality Improvement Search Queries

В статье представлены результаты исследования качества поисковых запросов студентов. Анализ полученных данных показал необходимость оптимизации поисковых запросов. В рамках работы были обработаны и реструктурированы алгоритмы построения запросов в различных поисковых системах, что привело к уменьшению времени составления корректного поискового запроса и увеличению качества получаемой пользователем информации. При составлении указанных алгоритмов применялись орграфы и алгоритм Дейкстры.The article presents the results of a study of the quality of students' search queries. Analysis of the data obtained showed the need to optimize search queries. As part of the work, the algorithms for constructing queries in various search engines were processed and restructured, which led to a reduction in the time for compiling a correct search query and an increase in the quality of information received by the user. Digraphs and Dijkstra's algorithm were used in the compilation of these algorithms

Optimization of Search Queries from the Point of View of Environmental Problems

В данной исследовательской работе был рассмотрен тезис о возможности экономии времени и уменьшении ресурсного потребления за счет оптимизации поиска информации. Авторами разработан плагин, встраиваемый в поисковую систему, позволяющий ускорить поиск. Данная разработка приводит к сокращению затрачиваемой компьютерным оборудованием электроэнергии, снижению выброса углерода в атмосферу, а значит, уменьшению вреда окружающей среде.In this research paper, the thesis was considered about the possibility of saving time and reducing resource consumption by optimizing the search for information. The authors have developed a plugin embedded in the search engine, which allows you to speed up the search. This development leads to a reduction in the electricity consumed by computer equipment, a reduction in carbon emissions into the atmosphere, and therefore a reduction in environmental harm

Application of Test Technologies in the Process of Teaching Students of Different Levels of Training

Тестовые технологии в комбинации с компьютерными технологиями способны решать некоторые проблемы организации учебного процесса, например, в случае, если обучающиеся имеют разный предшествующий образовательный уровень - среднее общее образование или среднее профессиональное образование. В статье анализируются различные точки зрения студентов первого курса профессионально-педагогического университета на возможности тестовых технологий.Test technologies in combination with computer technologies are able to solve some problems of the organization of the educational process, for example, if students have different previous educational level - secondary general education or secondary vocational education. The article analyzes the different points of view of first-year students of a vocational pedagogical university on the possibilities of test technologies

An evolutionary timeline of the oxytocin signaling pathway.

Oxytocin is a neuropeptide associated with both psychological and somatic processes like parturition and social bonding. Although oxytocin homologs have been identified in many species, the evolutionary timeline of the entire oxytocin signaling gene pathway has yet to be described. Using protein sequence similarity searches, microsynteny, and phylostratigraphy, we assigned the genes supporting the oxytocin pathway to different phylostrata based on when we found they likely arose in evolution. We show that the majority (64%) of genes in the pathway are 'modern'. Most of the modern genes evolved around the emergence of vertebrates or jawed vertebrates (540 - 530 million years ago, 'mya'), including OXTR, OXT and CD38. Of those, 45% were under positive selection at some point during vertebrate evolution. We also found that 18% of the genes in the oxytocin pathway are 'ancient', meaning their emergence dates back to cellular organisms and opisthokonta (3500-1100 mya). The remaining genes (18%) that evolved after ancient and before modern genes were classified as 'medium-aged'. Functional analyses revealed that, in humans, medium-aged oxytocin pathway genes are highly expressed in contractile organs, while modern genes in the oxytocin pathway are primarily expressed in the brain and muscle tissue