The research and development of frequency-controlled electric drive

Рассмотрен подход к реализации автономного генератора на базе асинхронного двигателя с фазным ротором с подключением цепи статора к нагрузке и питанием роторных обмоток от регулируемого источника переменного тока, а также определены границы устойчивой генерации электроэнергии.The approach to implement a stand-alone generator based on an induction motor with a wound rotor connected to the stator circuit to the load and the power rotor windings from a regulated source of alternating current, and also defined the boundaries of sustainable electricity generation

Interplay among transversity induced asymmetries in hadron leptoproduction

In the fragmentation of a transversely polarized quark several left-right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows to establish quantitative relationships among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.Comment: 6 figure

Measurement of the charged-pion polarisability

The COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190\,GeV pions impinging on a nickel target. The exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $Q^2<0.0015$\,(GeV/$c$)$^2$. From a sample of 63\,000 events the pion electric polarisability is determined to be $\alpha_\pi\ =\ (\,2.0\ \pm\ 0.6_{\mbox{\scriptsize stat}}\ \pm\ 0.7_{\mbox{\scriptsize syst}}\,) \times 10^{-4}\,\mbox{fm}^3$under the assumption$\alpha_\pi=-\beta_\pi$, which relates the electric and magnetic dipole polarisabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction, that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambigiously known, was performed for an independent estimate of the systematic uncertainty.Comment: Published version: 9 pages, 3 figures, 1 tabl

Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering

A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality $Q^{2}>1$ (GeV/$c$)$^2$, invariant mass of the hadronic system $W > 5$ GeV/$c^2$, Bjorken scaling variable in the range $0.003 < x < 0.4$, fraction of the virtual photon energy carried by the hadron in the range $0.2 < z < 0.8$, square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV/$c)^2 < P_{\rm{hT}}^{2} < 3$ (GeV/$c$)$^2$. The multiplicities are presented as a function of $P_{\rm{hT}}^{2}$ in three-dimensional bins of $x$, $Q^2$, $z$ and compared to previous semi-inclusive measurements. We explore the small-$P_{\rm{hT}}^{2}$ region, i.e. $P_{\rm{hT}}^{2} < 1$ (GeV/$c$)$^2$, where hadron transverse momenta are expected to arise from non-perturbative effects, and also the domain of larger $P_{\rm{hT}}^{2}$, where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small $P_{\rm{hT}}^{2}$ to study the dependence of the average transverse momentum $\langle P_{\rm{hT}}^{2}\rangle$ on $x$, $Q^2$ and $z$. The power-law behaviour of the multiplicities at large $P_{\rm{hT}}^{2}$ is investigated using various functional forms. The fits describe the data reasonably well over the full measured range.Comment: 28 pages, 20 figure

Resonance Production and ππ\pi\pi S-wave in π−+p→π−π−π++precoil\pi^- + p \rightarrow \pi^- \pi^- \pi^+ + p_{recoil} at 190 GeV/c

The COMPASS collaboration has collected the currently largest data set on diffractively produced $\pi^-\pi^-\pi^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant $3\pi$ production. In this paper, we present detailed studies on selected $3\pi$ partial waves with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{-+}$, $2^{++}$, and $4^{++}$. In these waves, we observe the well-known ground-state mesons as well as a new narrow axial-vector meson $a_1(1420)$ decaying into $f_0(980) \pi$. In addition, we present the results of a novel method to extract the amplitude of the $\pi^-\pi^+$ subsystem with $I^{G}J^{PC} = 0^+ 0^{++}$ in various partial waves from the $\pi^-\pi^-\pi^+$ data. Evidence is found for correlation of the $f_0(980)$ and $f_0(1500)$ appearing as intermediate $\pi^- \pi^+$ isobars in the decay of the known $\pi(1800)$ and $\pi_2(1880)$.Comment: 96 page

Constitutional status of the Russian State Council in the mirror of actual constitutional reforms

The subject of research is social relations concerning the constitutional transformation of the State Council of the Russian Federation into the format of a constitutional state body, it’s tasks and functions in the unified system of public power. The aim of the research is to confirm or disprove hypothesis that the Russian State Council is a constitutional state body that ensures the coordinated functioning and interaction of authorities in the unified system of public power.The methodological basis of the research includes historical, comparative legal, formal legal methods, legal modeling and forecasting. The research is based on existing and historical legal acts, materials of judicial practice, as well as on the works of leading national lawyers.The main results, scope of application. The authors substantiate concept of the constitutional status of the Russian State Council as a completely new constitutional state body, formed on the basis of modern national principles of state building, taking into account the existing constitutional practice. Main task of the State Council is exercising the constitutional powers of the Russian President to ensure the coordinated functioning and interaction of public authorities, the definition of the main directions of national and foreign policy of the state. The article provides a critical analysis of the goals, tasks, functions of the Russian State Council, the decisions it makes, as a result of which a number of conflicts in the regulation of its constitutional-legal status are revealed. Some proposals to improve legislation and law enforcement practice aimed at solving of the discovered contradictions are made. Current constitutional of the State Council is a result of the constitutional amendments of 2020 in the Russian Constitution and innovations in the Federal Law on the State Council of the Russian Federation. The authors substantiate the idea that the consolidation of a new constitutional position of the State Council can be considered as a process of forming a completely new state body, designed to ensure the coordinated functioning and interaction of bodies included in the unified public system. A comparative legal analysis of the constitutional legislation on State Councils in foreign countries showed that despite the same name the status and functions of these state institutions differ greatly in different countries, therefore any comparative study of them will be unreliable.Conclusions. The Russian State Council has competence, functions of a state power character, take decisions signed by the President of the Russian Federation and therefore have a generally binding character. So it has the characteristics of a public authority. The Russian State Council is a new constitutional and legal structure - a constitutional state body created in order to implement the constitutional powers of the Russian President to ensure the coordinated functioning and interaction of other bodies (that are part of the unified system of public authority) and to determine the main directions of domestic and foreign policy of the state

Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $Q^2>1~({\rm GeV}/c)^2$. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/$c$ polarised muon beam impinging on a polarised $^6$LiD target. By analysing the full range in hadron transverse momentum $p_{\rm T}$, the different $p_{\rm T}$-dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation $\Delta g/g$ is evaluated at leading order in pQCD at a hard scale of $\mu^2= \langle Q^2 \rangle = 3 ({\rm GeV}/c)^2$. It is determined in three intervals of the nucleon momentum fraction carried by gluons, $x_{\rm g}$, covering the range $0.04 \!<\! x_{ \rm g}\! <\! 0.28$~ and does not exhibit a significant dependence on $x_{\rm g}$. The average over the three intervals, $\langle \Delta g/g \rangle = 0.113 \pm 0.038_{\rm (stat.)}\pm 0.036_{\rm (syst.)}$ at $\langle x_{\rm g} \rangle \approx 0.10$, suggests that the gluon polarisation is positive in the measured $x_{\rm g}$ range.Comment: 14 pages, 6 figure

The role of TGF-β1 gene polymorphisms in the development of post-transplant complications

Transforming growth factor beta 1 (TGF-β1) is an immunosuppressive and profibrogenic cytokine capable of influencing the development of graft rejection and graft fibrosis in solid organ recipients. The TGF-β gene has a significant polymorphism that may cause individual protein expression levels and be associated with post-organ transplant complications. It is believed that three TGFB1 polymorphic variants (rs1800469, rs1800470 and rs1800471) may be associated with the development of graft rejection, graft fibrosis and chronic dysfunction of a heart, liver or kidney transplant. A review of current literature presents the results of studies on the relationship between TGF-β1 gene polymorphisms and post-transplant complications in solid organ recipients. The findings of various studies of TGF-β1 gene polymorphism in solid organ recipients are not always unambiguous, and their results are often difficult to generalize even with the help of meta-analysis. Samples included in studies vary in terms of ethnicity, gender, age, and underlying medical conditions, while results are highly dependent on sample structure or latent relatedness. Currently available data suggest that TGFB1 polymorphism may determine a predisposition to the development of graft rejection, graft fibrosis and graft dysfunction in solid organ recipients, but this is not conclusive and requires further, larger studies

Optimization of approaches to the assessment of some indicators of health condition of children of ethnic Khanties based on the development of standards adapted to them

Objective: to evaluate the efficiency of the assessment of physical and sexual development, and blood pressure indicators of school-age children of the ethnic Khanties using standards developed on this cohort in comparison with the use of standards that are not adapted to them. Material and methods: the authors assessed of physical and sexual development, and blood pressure indicators in 423 ethnic Khanty children aged 7 to 17 years using standards developed on a cohort of children of the Khanty, the alien population of the north, and international standards. Results: statistically significant differences in the results of the assessment of anthropometric data, blood pressure, and sexual development were found using standards developed on different cohorts of children. The application of standards for the alien population of the north and international standards distorts the conclusion about the assessment of the health of children of ethnic Khanty and contributes to the underdiagnoses of obesity, excess body weight, and arterial hypertension, overdiagnoses of nanism, and a delay in sexual development. Conclusion: the presence of features of physical and sexual development, and blood pressure of ethnic Khanty children determines the need in the standards developed on this ethnically isolated cohort of children for individual and population assessment of their health

Замена преднизолона на дексаметазон как способ преодоления резистентности к абиратерону при кастрационно-резистентном раке предстательной железы: клинический случай

Nowadays there are several effective drugs to treat castration-resistant prostate cancer. However, treatment options are still limited. In this regard, overcoming the resistance to the prescribed treatment remains extremely important. One possible way is to replace prednisone with dexamethasone when using abiraterone acetate. There are several studies, including randomized ones, which confirm the rationality of this method. We present a literature review and our own clinical observation, which demonstrates the possibility of repeated long-term (3 years) use of abiraterone acetate after replacing a steroid drug in an intensively pre-treated patient with castration-resistant prostate cancer.Варианты лечения кастрационно-резистентного рака предстательной железы на сегодняшний день представлены несколькими эффективными препаратами. Тем не менее набор опций терапии все еще ограничен. В связи с этим чрезвычайно важным остается вопрос о преодолении резистентности к назначенному лечению. Одним из возможных путей является замена преднизолона на дексаметазон при использовании абиратерона ацетата. Существует несколько исследований, в том числе рандомизированных, результаты которых подтверждают рациональность такого метода. Представляем обзор литературы и собственное клиническое наблюдение, в котором продемонстрирована возможность повторного длительного (3 года) использования абиратерона ацетата после замены стероидного препарата-партнера у интенсивно предлеченного пациента с кастрационно-резистентным раком предстательной железы