A Study of the Finite Flat Plate Problem Using Various Kinetic and Continuum Models

Abstract. The supersonic flow past a finite flat plate at zero angle of attack is considered. The Navier-Stokes equations, Direct Simulation Monte Carlo (DSMC) statistical method and deterministic solving relaxation-type model kinetic equations using a high-order shock capturing scheme are used for numerical simulation of the problem. The results obtained with different approaches are compared and analyzed. The limits of continuum approach applicability as well as the accuracy of description based on model kinetic equations are studied

A mathematical model of the rear-trailed top harvester and an evaluation of its motion stability

Received: October 7th, 2021 ; Accepted: December 10th, 2021 ; Published: December 10th, 2021 ; Correspondence: [email protected] the quality of sugar beet harvesting to a great extent depends on the first operation in the process, which involves cutting and harvesting sugar beet tops. This technological process is performed with the use of either the haulm harvesting modules of beet harvesters or top harvesting machines as separate agricultural implements, which are aggregated with a tractor. At the same time, front-mounted harvesters are as widely used as trailed asymmetric implements, in which case the aggregating tractor moves on the already harvested area of the field. The purpose of this work is to determine the optimal design and kinematic parameters that would improve the stability in the performance of the technological process of harvesting sugar beet tops by means of developing the basic theory of the plane-parallel motion performed by the rear-trailed asymmetric top harvester. As a result of the analytical study, an equivalent scheme has been composed, on the basis of which a new computational mathematical model has been developed for the plane-parallel motion of the asymmetric top harvester in the horizontal plane on the assumption that the connection between the wheeled tractor and the rear-trailed top harvester is made in the form of a cylindrical hinge joint. Using the results of mathematical modelling, the system of linear second-order differential equations that determines the transverse movement of the centre of mass of the aggregating wheeled tractor and the rotation of its longitudinal symmetry axis by a certain angle about the said centre of mass as well as the angle of deviation of the rear-trailed asymmetric top harvester from the longitudinal symmetry axis of the tractor at an arbitrary instant of time has been obtained. The solving of the obtained system of differential equations provides for determining the stability and controllability of the motion performed by the asymmetric machine-tractor unit, when it performs the technological process of harvesting sugar beet tops

Comparative characteristics of quality of life in patients, suffering locally-spread mammary gland cancer after conduction of regional and intravenous chemotherapy

Objective. Investigation of quality of life (QL) in patients, suffering inoperable forms (locally-spread) of mammary gland cancer (MGC), before and after conduction of neoadjuvant courses of systemic polychemotherapy (SPCHTH) and selective intraarterial polychemotherapy (SIAPCHTH) in combination with SPCHTH. Маterials and methods. Complex treatment was conducted in 154 patients, suffering locally-spread MGC T4A-DN0-3M0 in a period 2000 -2017 yrs, on base of Donetsk Regional Antitumoral Centre and The University Clinic of Odessa National Medical University. All the patients were divided into two groups. Tо Group I (control) were included 65 patients, suffering inoperable forms of a locally-spread MGC, to whom as a neoadjuvant course a SPCHTH was conducted; and to the Group II (investigating) - 89 patients, suffering inoperable forms of locally-spread MGC, to whom a SIAPCHTH was conducted as a neoadjuvant course. Results. Through the period of treatment a wave-like dynamics of the quality of life index was observed, which indicated a definite advantage of SIAPCHTH over SPCHTH. A limited statistically trustworthy difference in favor of regional polychemotherapy was formed between the Groups of patients in accordance to the quality of life index. Conclusion. Investigation of quality of life constitutes a secure, informative and economic method of estimation of a patient state of health on the groupings and the individuals levels. In oncological investigations the QL assessment constitutes an important criterion of the treatment efficacy estimation and has a prognostic significance. Estimation of quality of life in clinical investigations improves the investigation quality itself

RILEM TC 247-DTA round robin test: carbonation and chloride penetration testing of alkali-activated concretes

Many standardised durability testing methods have been developed for Portland cement-based concretes, but require validation to determine whether they are also applicable to alkali-activated materials. To address this question, RILEM TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ carried out round robin testing of carbonation and chloride penetration test methods, applied to five different alkali-activated concretes based on fly ash, blast furnace slag or metakaolin. The methods appeared overall to demonstrate an intrinsic precision comparable to their precision when applied to conventional concretes. The ranking of test outcomes for pairs of concretes of similar binder chemistry was satisfactory, but rankings were not always reliable when comparing alkali-activated concretes based on different precursors. Accelerated carbonation testing gave similar results for fly ash-based and blast furnace slag-based alkali-activated concretes, whereas natural carbonation testing did not. Carbonation of concrete specimens was observed to have occurred already during curing, which has implications for extrapolation of carbonation testing results to longer service life periods. Accelerated chloride penetration testing according to NT BUILD 443 ranked the tested concretes consistently, while this was not the case for the rapid chloride migration test. Both of these chloride penetration testing methods exhibited comparatively low precision when applied to blast furnace slag-based concretes which are more resistant to chloride ingress than the other materials tested

Voting 'against all' in postcommunist Russia

Since the early 1990s voters in Russia (and most of the other post-Soviet republics) have been offered the opportunity to vote ‘against all’ parties and candidates. Increasing numbers have done so. The evidence of two post-election surveys indicates that ‘against all’ voters are younger than other voters, more urban and more highly educated. They do not reject liberal democracy, but are critical of the contemporary practice of Russian politics and find no parties that adequately reflect their views. With the ending of the ‘against all’ facility in 2006 and other changes in the Russian electoral system under the Putin presidency, levels of turnout are likely to fall further and the protest vote will seek other outlets within or outside the parliamentary system

Comparative characteristics of quality of life in patients, suffering locally-spread mammary gland cancer after conduction of regional and intravenous chemotherapy

Мета – дослідити якість життя (ЯЖ) хворих з неоперабельними формами місцево-розповсюдженого (МР) раку молочної залози (РМЗ) до та після проведення неоад’ювантних курсів системної поліхіміотерапії (СПХТ) та селективної внутрішньоартеріальної поліхіміотерапії (СВАПХТ) у комбінації з СПХТ. Комплексне лікування на базі Донецького обласного протипухлинного центру та Університетської клініки Одеського національного медичного університету проведено 154 хворим із МР РМЗ T4А–DN0–3M0 за період з 2000 по 2017 р. Всіх хворих розподілили на дві групи. До групи 1 (контрольна) включено 65 пацієнток з неоперабельними формами МР РМЗ, яким як неоад’ювантний курс проведена СПХТ; до групи 2 (досліджувана) – 89 пацієнток з неоперабельними формами МР РМЗ, яким як неоад’ювантний курс проведена СВАПХТ.Objective. Investigation of quality of life (QL) in patients, suffering inoperable forms (locally-spread) of mammary gland cancer (MGC), before and after conduction of neoadjuvant courses of systemic polychemotherapy (SPCHTH) and selective intraarterial polychemotherapy (SIAPCHTH) in combination with SPCHTH. Complex treatment was conducted in 154 patients, suffering locally–spread MGC T4A–DN0–3M0 in a period 2000 –2017 yrs, on base of Donetsk Regional Antitumoral Centre and The University Clinic of Odessa National Medical University. All the patients were divided into two groups. Tо Group I (control) were included 65 patients, suffering inoperable forms of a locally–spread MGC, to whom as a neoadjuvant course a SPCHTH was conducted; and to the Group II (investigating) – 89 patients, suffering inoperable forms of locally–spread MGC, to whom a SIAPCHTH was conducted as a neoadjuvant course

Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production via two-photon collisions

We report the measurement of gamma gamma to eta_c(1S), eta_c(2S) to eta' pi+ pi- with eta' decays to gamma rho and eta pi+ pi- using 941 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The eta_c(1S) mass and width are measured to be M = [2984.6\pm0.7 (stat.)\pm2.2 (syst.)] MeV/c^{2} and \Gamma = [30.8^{+2.3}_{-2.2}~(stat.) \pm 2.5~(syst.)] MeV, respectively. First observation of eta_c(2S) to eta' pi+ pi- with a significance of 5.5sigma including systematic error is obtained, and the eta_c(2S) mass is measured to be M = [3635.1\pm3.7~(stat.)\pm2.9~(syst.)] MeV/c^{2}. The products of the two-photon decay width and branching fraction (B) of decays to eta'pi+ pi- are determined to be \Gamma_{gamma gamma}B = [65.4\pm2.6~(stat.)\pm6.9~(syst.)] eV for eta_c(1S) and [5.6^{+1.2}_{-1.1}~(stat.)\pm1.1~(syst.)] eV for eta_c(2S). A new decay mode for the eta_c(1S) to eta'f_0(2080) with f_0(2080) to pi+ pi- is observed with a statistical significance of 20sigma. The f_0(2080) mass and width are determined to be M = [2083^{+63}_{-66}~(stat.)\pm 32~(syst.)] MeV/c^{2} and \Gamma = [178^{+60}_{-178}~(stat.) \pm 55~(syst.)] MeV. The cross sections for gamma gamma to eta' pi+ pi- and eta'f_{2}(1270) are measured for the first time.Comment: 19 pages, 14 figure

Observation of an alternative χc0(2P)\chi_{c0}(2P) candidate in e+e−→J/ψDDˉe^+ e^- \rightarrow J/\psi D \bar{D}

We perform a full amplitude analysis of the process $e^+ e^- \rightarrow J/\psi D \bar{D}$, where $D$ refers to either $D^0$ or $D^+$. A new charmoniumlike state $X^*(3860)$ that decays to $D \bar{D}$ is observed with a significance of $6.5\sigma$. Its mass is ($3862^{+26}_{-32}{}^{+40}_{-13}$) MeV/$c^2$ and width is ($201^{+154}_{-67}{}^{+88}_{-82}$) MeV. The $J^{PC}=0^{++}$ hypothesis is favored over the $2^{++}$ hypothesis at the level of $2.5\sigma$. The analysis is based on the 980 $\mathrm{fb}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$ collider KEKB.Comment: 17 pages, 11 figure

Studies of charmed strange baryons in the ΛD\Lambda D final state at Belle

We report the discovery of $\Xi_{c}(3055)^{0}$, observed by its decay into the final state $\Lambda D^{0}$, and present the first observation and evidence of the decays of $\Xi_c(3055)^{+}$ and $\Xi_c(3080)^{+}$ into $\Lambda D^{+}$. We also perform a combined analysis of the $\Lambda D^{+}$ with the $\Sigma_{c}^{++}K^{-}$ and $\Sigma_{c}^{\ast ++}K^{-}$ decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions ${\cal B}(\Xi_{c}(3055)^{+} \to \Lambda D^{+})/{\cal B}(\Xi_{c}(3055)^{+} \to \Sigma_{c}^{++}K^{-})=5.09\pm1.01\pm0.76$, ${\cal B}(\Xi_{c}(3080)^{+} \to \Lambda D^{+})/{\cal B}(\Xi_{c}(3080)^{+} \to \Sigma_{c}^{++}K^{-})=1.29\pm0.30\pm0.15$, and ${\cal B}(\Xi_{c}(3080)^{+} \to \Sigma_{c}^{\ast ++}K^{-})/{\cal B}(\Xi_{c}(3080)^{+} \to \Sigma_{c}^{++}K^{-})=1.07\pm0.27\pm0.01$, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb$^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider.Comment: Submitted to PR

Measurement of Branching Fractions of Hadronic Decays of the Ωc0\Omega_c^0 Baryon

Using a data sample of 980 ${\rm fb}^{-1}$ of $e^+e^-$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider, we report the results of a study of the decays of the $\Omega_c^0$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $\Omega_c^0$ into $\Omega^-\pi^+\pi^0$, $\Omega^-\pi^+\pi^-\pi^+$, $\Xi^-K^-\pi^+\pi^+$, and $\Xi^0K^-\pi^+$, as well as the first measurements of the branching fractions of the $\Omega_c^0$ into $\Xi^-\bar{K}^0\pi^+$, $\Xi^0\bar{K}^0$, and $\Lambda \bar{K}^0\bar{K}^0$, all with respect to the $\Omega^-\pi^+$ decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay $\Omega_c^0\to\Sigma^+K^-K^-\pi^+$