bluuebunny/crossref_metadata_2025 huggingface dataset:
Immagini della Russia tra Oriente e Occidente nel XVI secolo: politica, religione, culture nella Moscovia di Antonio Possevino
Authors: Melani Igor
Published: February 2022

This paper focuses on the analysis of Moscovia, written by Antonio Possevino soon after his diplomatic mission (1581-1582) to the Tsar Ivan IV. The text, composed as a geographical and ethnographical description of a given territory, became a collection of theological and controversial writings on the topic of the eastern Greek and Muscovite schism during its 40 years of editorial history. A deeper analysis of some political aspects of the text, though, shows how these different parameters were somehow inextricably connected within the catholic vision of the ‘orthodox’ East.
Entre mythe et histoire, syncrétisme et fracture, universalité et russité: le recueil Mednyj Kit (Baleine de bronze) au coeur de l’esthétique révolutionnaire de Nikolaj Kljuev
Authors: Sinichkina Daria
Published: February 2022

Soon after greeting the February revolution, Klyuev turns to an aesthetic of violence and disruption. In the poetic cycle Medny Kit (1918), the utopia of “peasant paradise” stems from the apocalyptic destruction of old Russia. While the poet contemplates the cyclicity of Russian history, the lyrical subject comes transfigured out of the “red” baptism, identifying himself simultaneously to Rasputin and Avvakum. As the cycle captures the brutal melody of the times, the lyric genre is pushed to its limit – polyphony, which announces the transition to narrative and epic poetry.
Penser la phase perdue du modernisme russe
Authors: Livak Leonid
Published: February 2022

This paper proposes a revision of Russian modernism’s politically-motivated chronology and geography through the integration of two academic subfields – modernist and exilic studies. Such an integrative approach allows us better to position Russian modernist culture vis-à-vis its western counterparts, returning our research subject to its original context in the larger, international modernist field. The paper will subsequently offer a tentative sketch of the aesthetic and philosophical premises of late Russian modernism against the backdrop of western modernist practices in the 1930s.
Checking the adequacy of the mathematical model of the wear of electric brushes, taking into account the dynamics of their interaction with the collector
Authors:   Harlamov V.V. Popov D.I. Moskalev YU.V. Baysadyikov M.F.
Published: February 2022

The adequacy of the mathematical model of the wear of electric brushes of direct current collector machines, taking into account the dynamics of their interaction with the collector surface, is verified. The wear of electric brushes in laboratory conditions and during operation of traction motors of rolling stock is analyzed. Comparison of the results of modeling and experimental studies using different criteria showed that the mathematical model of brush wear can be used to forecast the residual life of electric brushes with a given accuracy.
Keywords: electric motor, electric brush, wear, mathematical modeling, forecasting, residual life.
hvv-omgups@mail.ru, popovomsk@yandex.ru
Features of the synthesis of transmissions with parallel axes for machining equipment
Authors: Muhovatyiy A.A..
Published: February 2022

A mathematical model of the synthesis of the initial contour of the teeth of gears according to the criterion of the reduced curvature of the working surfaces is presented. The geometric parameters of the initial contours of the gear teeth with high values of the performance criteria for machining equipment are determined.
Keywords: initial contour, gear transmission, criterion, strength, analysis.
mukhovatiy@mail.ru
Comparison of the tribological parameters of solid lubricating coatings based on molybdenum diselenide, deposited in different ways to parts of friction units, operated under normal atmospheric pressure and in vacuum
Authors:   Khopine P.N. Grib V.V. Silchenko O.B.
Published: February 2022

The tribological characteristics of solid lubricating coatings (SLC) based on Mo—Se—C by various methods of deposition in vacuum and at normal atmospheric pressure are investigated. It is established that the linear wear rate of SLC of magnetron deposition on DC324 direct current practically coincides with that of VNII NP 212 SLC based on МоS2 of suspension deposition. The coating obtained by chemical-thermal treatment (CTT) with selenium of the molybdenum base is an order of magnitude inferior in this parameter. The friction coefficients of DC324 SLC and МоSe2 CTT are in 2—3 times lower than that of VNII NP 212 SLC of suspension deposition for friction modes corresponding to a surface temperature of 36.5÷59.2 °C.
Keywords: solid lubricating coating, tribological indicators, diffusion and magnetron-radio frequency deposition, normal atmospheric pressure, vacuum.
chopinp@mail.ru, silyaolya@yandex.ru, grib-vladimir.g@ya.ru
Remote monitoring system of technical condition with the function of control compliance with the modes of mobile power vehicles
Authors:   Kostomahin M.N. Kataev Yu.V. Petrischev N.A. Sayapin A.S. Molibojenko K.K.
Published: February 2022

The prototype and proposals for equipping with a system of observance of the rules for the operation of equipment and remote control of the technical condition during the warranty and post-warranty periods of energy-saturated domestic tractors are theoretically substantiated and practically investigated. This will allow to receive objective information about the state of technology and promptly respond to violations of the rules of its operation, related, among other things, to the human factor.
Keywords: control of technical condition, technical service, human factor, remote control, rules of equipment operation.
ykataev@rgau-msha.ru
Influence of variable loading modes on the effectiveness of re-hardening with shot-peening
Authors: Kravchenko G.N.
Published: February 2022

The regularities of the effectiveness of repeated hardening with shot-peening from the modes of preliminary cyclic loading of specimens from "30ХГСН2А" steel are established. Recommendations are given on the timing of repeated hardening, taking into account the level and duration of preloading for the complete restoration of the fatigue life of previously hardened parts.
Keywords: fatigue strength, durability, resource recovery, shot-peening, re-hardening, high-strength steel, fatigue damages, cyclic operating time.
gnkrav@mail.ru
Educación ambiental y sostenibilidad: Aportes desde el saber pedagógico para la educación del siglo XXI
Authors: Pérez Luz Mireya , Silva Hidalgo Álvaro Steven , Almanza Ana Ruth , Melo Jaramillo Carolina , Marín Santamaría Carolina , Negrete Soler Edith Constanza , Sánchez Reyes Lesly Alexa , Velásquez Palacios Martha Isabel , Bonilla Valero Nancy , Rubio Álvarez Alexander
Published: February 2022

En los últimos diez años, el tema ambiental ha tenido gran auge a nivel mundial y, por supuesto, a conveniencia de sectores políticos, sociales y económicos que influyen en las costumbres y los avances tecnológicos e industriales de la humanidad, lo anterior, acompañado de una creciente conciencia ambiental sobre las riquezas naturales y el inicio de una intervención que compense el desgaste del planeta; el sector educativo ha sido uno de los actores llamados a intervenir en la crisis ambiental por la que atraviesa la Tierra. Los docentes, cualquiera que sea su formación, han ido tejiendo un vínculo especial de protección y compromiso con la vida y los recursos existentes, asumen la defensa de la naturaleza con roles empoderados de líderes y voceros de la cultura e identidad ambiental entre sus comunidades.
Interculturalidad, ciudadanía global y cultura de paz: Aportes desde el saber pedagógico para la educación del siglo XXI
Authors: Díaz Sánchez Edisson , Acero Rodríguez Diana Carolina , Vargas Camacho José Joaquín , Guerrero-Rivera Javier , Rubio Álvarez Alexander
Published: February 2022

A los seres humanos nos habita el lenguaje como facultad inherente de la especie. Esta cobra vida a través de distintos sistemas no verbales y verbales para comunicar: la quinésica, la proxémica, los ideogramas, el braile (Louis Braille), las señas, los dibujos, los objetos, los sonidos, las palabras orales o escritas, entre otros. Mediante esta multiplicidad de sistemas de comunicación se teje la memoria de los pueblos, las comunidades y los individuos; se teje la experiencia cultural, social e individual.
FEATURES OF FORMING THE LOGIC OF STRATEGIC MANAGING CHANGE IN THE ORGANIZATION
Authors:   Saint-Petersburg State University of Aerospace Instrumentation, St. Petersburg, Russia, Pesotskiy Aleksei B. , Snetov Sergei S. ,   Saint-Petersburg State University of Aerospace Instrumentation, St. Petersburg, Russia
Published: February 2022

The article considers an approach to the formation of the logic of strategic change management in an organization in the phases of identifying a weakly limited managerial problem, applying a scenario approach to form strategic alternatives, choosing a strategy and approach to conducting organizational change, as well as a strategy for implementing change on a given strategic planning horizon. The application of theoretical tools used to identify the problem, design and implementation of organizational change is discussed, general conclusions and recommendations are prepared.
FEATURES OF THE ISLAMIC ECONOMY AND THE PRACTICAL IMPLEMENTATION OF ISLAMIC BANKING
Authors:   Institute of Asian and African Studies, Lomonosov Moscow State University, Moscow, Russia, Solodovnik Dilyara M. , Khairetdinov Damir Z. ,   Institute of Asian and African Studies, Lomonosov Moscow State University, Moscow, Russia
Published: February 2022

The article discusses the features of the functioning of the Islamic economy, which has specific tools for functioning on the basis of the Holy Scriptures. After centuries, these mechanisms have been effectively used by the banking sector, meeting the needs of the development of the world economy. An attempt is made to compare modern banking terminology with traditional concepts of Islamic banking. Historical examples of the use of Islamic instruments of financial and economic activity are given, as well as objective facts and figures that indicate the huge volumes of assets regulated by elements of Islamic banking in Islamic and Western countries. The special role of the so-called Islamic windows in numerous Western banks is noted.
DETERMINATION OF THE LOAN PORTFOLIO ON THE BASIS OF CALCULATION OF THE BANK'S OWN CAPITAL PROFITABILITY USING THE CREDIT RISK ASSESSMENT MODEL
Authors:   Udmurt State University, Izhevsk, Russia, Shirobokova Margarita A.
Published: February 2022

According to the requirements of the regulator, banks must assess the risk of the borrower, and for this purpose, such risk assessment is more often carried out using the construction of scoring models. The scoring model, which allows borrowers to be ranked according to their individual risk of ultimate losses, is often the basis for building a loan portfolio. However, this approach does not consider financial indicators. The approach proposed earlier [9] made it possible to find such a portfolio of loans that would satisfy the initial restriction on both risk and return on capital, depending on the bank's credit policy. The calculations were made based on available data on contracts and defaults of a regional retail bank. The calculations show that the approach under consideration allows increasing the profit of a credit institution with a constant amount of equity, by issuing the most profitable loans while maintaining the level of risk.
INNOVATIVE SERVICES AND TECHNOLOGIES AS A FACTOR OF GROWTH OF COMPETITION IN THE FINANCIAL MARKET
Authors:   Southwest State University, Kursk, Russia, Kolmykova Tatyana S. , Gribov Roman V. ,   Southwest State University, Kursk, Russia, Astapenko Elena O. ,   Yugra State University, Khanty-Mansiysk, Russia
Published: February 2022

The article examines the content aspects of digitalization as a new paradigm of socio-economic relations, which led to the emergence of new factors of production - data in digital format. It is revealed that the spread of new technological solutions leads to the need for rapid response of financial market agents to changing conditions and formats of work. Modern banks have been developing remote customer service technologies, and the COVID-19 coronavirus pandemic has served as a catalyst for accelerating these processes. Financial organizations are actively improving mobile application services, expanding their range and creating marketplaces and full-fledged ecosystems.
RESEARCH OF CONSUMER BEHAVIOR IN THE MARKET OF INTERNET BANKING SERVICES
Authors:   Financial University under the Government of the Russian Federation, Moscow, Russia, Batanov Nikolai S.
Published: February 2022

The article describes the basics of research conducted in Russia on consumer behavior in the market of Internet banking services. The author considers the change in the model of consumer behavior, which is caused by the processes of digitalization of the economy of the Russian Federation that are actively taking place at the present time. The role of need as the main factor in the formation of consumer behavior in the field of Internet banking services is emphasized, and the factors that negatively affect the consumption of Internet banking services in the direction of their reduction are identified. The given statistics on the use of Internet banking services by Russian consumers allows the author to draw appropriate conclusions, compare the existing demand for the services offered.
A SYSTEM OF SCIENTIFIC RESEARCH METHODS THAT ENSURE THE ORDER OF ECONOMIC FORECASTING IN SECURING MILITARY SPENDING
Authors:   Military University of the Ministry of Defense of Russia, Moscow, Russia, Bashashkina Galina Yu.
Published: February 2022

The article considers a system of scientific research methods that ensure the order of economic forecasting in ensuring military spending. Consideration of the need for public spending is inextricably linked with the historical aspects of the creation of the Armed Forces, the development of models and methods to meet their needs. The history of the creation of the Armed Forces is connected with the birth of the state, one of the main qualities of which is belonging to the army, which is valuable for itself and its own needs. They provide everything necessary to fulfill their obligations in peacetime and in war, taking into account the impact of goods, money, relationships, needs for available materials (weapons, military and special equipment, real estate and any other materials) and financial resources. This resource can be provided by the State to which the Armed Forces belong.
METHODOLOGY OF COMPREHENSIVE ASSESSMENT OF THE RISK MANAGEMENT SYSTEM IN THE PROCESS OF CUSTOMS CONTROL IN THE CONDITIONS OF DEVELOPMENT
Authors:   Russian Customs Academy, Lyubertsy, Russia, Nasibullin Amir A.
Published: February 2022

The author has developed and presented a set of methods for assessing the risk management system based on the expertise of the personnel potential of the customs control process. The scheme of risk management system research from organizational positions has been developed. The problematic characteristics of the application and development of the risk management system are disclosed.
ASSESSMENT OF CONFLICT IN THE BEHAVIOR OF HOTEL EMPLOYEES
Authors:   Vladimir State University, Vladimir, Russia, Lavrova Galina N. , Matveeva D. ,   Vladimir State University, Vladimir, Russia
Published: February 2022

The article provides information on assessing the predisposition to conflicts of employees of hotel enterprises in project activities on the example of LLC «Klyazma-Tour».
DEVELOPMENT OF A MODEL OF VALUE-ORIENTED ASSESSMENT OF THE COST OF CONSTRUCTION PROJECTS FROM THE POINT OF VIEW OF AN INSTITUTIONAL INVESTOR, TAKING INTO ACCOUNT THE INTERESTS OF KEY GROUPS OF STAKEHOLDERS
Authors:   National Research Moscow State University of Civil Engineering, Moscow, Russia, Shutova Lyudmila A.
Published: February 2022

In the modern conditions of the development of the world economy, a significant problem is being formed regarding the effectiveness of assessing the market value of construction projects from the point of view of institutional and private investors. This problem is caused by the instability and uncertainty of the development of the world economy, on the one hand, as well as the imperfection and lack of modernity of traditional methods of assessing the market value of construction projects, on the other. Within the framework of the current development of the situation in the global economy, the implementation of construction projects is associated with significant risks, which creates significant threats in the field of investment efficiency. This issue requires improving the process of assessing the market value of construction projects from the point of view of an institutional investor. The existing models of evaluation of construction projects are focused mainly on the profitability indicator and do not take into account two key factors: the dynamics of potential growth in the market value of the project and the interests of stakeholders as key persons able to influence the cost of the construction project. The model proposed in the framework of this study includes two key advantages in its structure, it allows you to calculate the growth potential of the market value of a construction project in an unstable economic situation. In addition, this model takes into account the interests of key groups of stakeholders, which makes it possible to determine that this model of estimating the market value of a construction project takes into account both quantitative and qualitative factors affecting the cost of the project. The model is based on the paradigm of comparative evaluation of construction projects from the point of view of an institutional investor, the calculation of the final results of the effectiveness of individual construction projects, according to this model, allows you to identify the most priority and effective from the point of view of a potential investor. This model makes it possible to assess the growth potential of the market value of a construction project both at the pre-investment stage and at the stage of direct investment. This model fully corresponds to modern trends in the field of investor orientation mainly on the potential growth rates of the market value of a construction project.
GLOBAL ECONOMIC INEQUALITY: TRENDS AND DEVELOPMENT DRIVERS
Authors:   Moscow State Institute of International Relations of the Ministry of Foreign Affairs of Russia, Moscow, Russia, Patrunina Kseniia A.
Published: February 2022

Global economic inequality has tended to decrease over the past three decades. However, in most countries, especially in advanced economies, intra-country inequality has increased. High levels of inequality are detrimental not only to macroeconomic stability but also to sustainable long-term growth. At the same time, new factors, such as the growing role of information and communication technologies or the COVID-19 pandemic, have a significant impact on all levels of economic inequality. To address the problem of inequality, it is important not only to develop policy directions, but also to monitor the dynamics of ongoing changes to develop relevant measures.
THE BRICS TRANSCONTINENTAL ASSOCIATION IS AN INNOVATIVE FORMAT OF INTERNATIONAL ECONOMIC PARTNERSHIP WITHOUT SANCTIONS POLICY
Authors:   Law Institute of the Russian University of Transport, Moscow, Russia, Dzhabiev Alexander P.
Published: February 2022

The article analyzes topical issues of current trends in the development of international cooperation, economic partnership against the background of the new industrial revolution for the socio-economic development of the BRICS countries. Considerable attention is paid to the BRICS Economic Partnership Strategy until 2025, prepared by the Russian side for the XI BRICS Summit with the aim of putting the member states on the trajectory of sustainable and balanced socio-economic growth. The idea of the need for an active response to the emerging global challenges, including macroeconomic and financial instability, is substantiated. The conclusion is reasoned that the BRICS countries are able to form a positive, adapted and clear economic agenda for expanding cooperation in the joint fight against large multinational corporations that violate competition rules, as well as those that have gained a dominant position in the world market.
NEW POSSIBILITIES TO STUDY THE FEATURES OF INTERACTION OF MUNICIPAL EMPLOYEES IN TRANSITIONAL FORMS OF THE MUNICIPAL SERVICE INSTITUTION (flexible management solutions in the post-coronacrisis period)
Authors:   Vladimir branch of the Russian Presidential Academy of National Economy and Public Administration, Potapova Elena P. , Savelev Igor I. ,   Vladimir State University named after A. G. and N. G. Stoletovs, Vladimir, Russia
Published: February 2022

Fractal nodes, a fractal network, as a set, are elements of a complex structure that is characteristic of controls. The actualization of identifying the features of the transformation of management systems arose acutely in the context of the post-corona crisis development of the situation. Narrow-profile research approaches and scientific tools worked out in the studies of sustainable systems quickly become obsolete in the face of the onslaught of the “new normal”.
Politische, mediale und kommunikative Dimensionen der Weblogs in Russland
Authors: Khrushcheva Daria
Published: February 2022

In der Informationsgesellschaft bilden Massenmedien und verschiedene Kan�le der Massenkommunikation zusammen das wichtigste �ffentlichkeitsforum. Die zunehmende Digitalisierung der Gesellschaft bedeutet neue Strukturen und Formen der Interaktion, neue M�glichkeiten f�r mehr Teilhabe, neue Chancen f�r kritische Gegen�ffentlichkeit und Alternativbewegung(en). Die vorliegende Publikation untersucht die heutige Medienlandschaft in Russland, die von einer monopolartigen Kontrolle der klassischen Medien durch den Staat gepr�gt ist. Diese Medien gehen sukzessive in den Besitz regierungsfreundlicher Unternehmen �ber und sind einer rigiden Gesetzgebung ausgesetzt, die sich zudem rapide �ndert. Die Untersuchung versucht die Fragen zu beantworten, wie das wachsende Misstrauen gegen�ber den staatlichen Strukturen und den traditionellen Medien sowie der Mangel an sozialer Kommunikation offline die Entwicklung von Online-Angeboten und ihre inhaltliche Agenda im Lande pr�gen, wie neue Medien und das Social Web die �ffentliche Meinung in Russland beeinflussen, wie sie von Vertretern der Zivilgesellschaft und unabh�ngigen sozialpolitischen Akteuren genutzt werden, welche M�glichkeiten neue Technologien f�r sie bieten und welche Perspektiven dadurch er�ffnet werden.
Der erbschaftsteuerliche Verschonungsabschlag im Europ�ischen Beihilferecht
Authors: B�ser Tobias
Published: February 2022

Die Beihilferelevanz von nationalen Steuerverg�nstigungen ist aktueller denn je. Auch der Verschonungsabschlag des � 13a ErbStG steht im Verdacht bestimmte Unternehmen � jedenfalls mittelbar � zu beg�nstigen. Daher widmet sich die Arbeit im Kern der Frage, ob die Steuerbefreiung f�r Betriebsverm�gen nach �� 13a, 13b ErbStG gegen das Europ�ische Beihilfeverbot aus Art. 107 Abs. 1 AEUV verst��t. Der Autor besch�ftigt sich insbesondere mit der Identifikation des beg�nstigten Unternehmens sowie der Selektivit�t des Verschonungsabschlags. Ebenso analysiert er die Entscheidung der Europ�ischen Kommission zur Sanierungsklausel und die beihilferechtlichen Urteile des Europ�ischen Gerichtshofs zu � 8c Abs. 1a KStG und � 6a GrEStG.
Investigating The Effects of Audio Exposure toward Podcast Listener Loyalty via Theory of Planned Behavior (A Study on Urban Millennials in Jakarta)
Authors: Justianto Jerry S. , Arief Mts , Susilowati Indah , Aras Muhamad
Published: February 2022

The purpose of this study was to determine the effect of audio exposure on podcast listener loyalty through the theory of planned behavior. This research method uses quantitative research methods using SEMPls. The results showed that there was an indirect effect on the frequency of AOD exposure that was positively related to individual attitudes towards AOD loyalty. While the frequency of AOD exposure is positively related to accepted subjective norms, there is no indirect effect of AOD exposure frequency related to subjective norms on AOD loyalty. While the frequency of AOD exposure has a positive but not significant effect on individual AOD loyalty, there is no indirect effect on the frequency of AOD exposure that is positively related to the individual's perceived behavioral control on AOD loyalty. Meanwhile, AOD has a positive and significant effect on AOD-Loyalty. Perceived subjective norm has a positive and significant effect on AOD loyalty attitudes. Perceived subjective norms have a positive but not significant effect on individual AOD loyalty. Perceived subjective norm has a positive and significant effect on AOD loyalty perceived control. From these results obtained a hypothesis which states that Perceived behavior control related to AOD is positively related to AOD loyalty attitudes and Perceived Behavior Control over AOD is positively related to AOD Loyalty. Perceived Behavior Control has a positive and significant effect on AOD Loyalty.
Real-Time Hand Gesture Recognition for Media Players
Authors:   dept. of IT, The Assam Kaziranga University Jorhat, India, Rajbonshi Rajib Losan , Saikia Amlan Jyoti ,   dept. of IT, The Assam Kaziranga University Jorhat, India, Saikia Sankar Jyoti ,   dept. of IT, The Assam Kaziranga University Jorhat, India, Patir Bhobesh ,   dept. of IT, The Assam Kaziranga University Jorhat, India, Muchahari Monoj Kumar ,   dept. of IT, The Assam Kaziranga University Jorhat, India
Published: February 2022

In this modern age of advancement in computing which has made the use of natural user interface much needed. Human gesture recognition is a mode of non-verbal interaction medium and can provide the most intuitive and natural way to interact with computer. The main aim is to make the interaction between human and computer as natural as the interaction between humans. The objective of this paper is to recognize the dynamic hand gesture images based on shapes and relative positions or direction of hand which is extracted from input video stream recording. These hand gestures can be used to recognition system to control multimedia applications running on computer using different gesture commands
Exploring the High-redshift PBH-ΛCDM Universe: Early Black Hole Seeding, the First Stars and Cosmic Radiation Backgrounds
Authors: Cappelluti Nico , Hasinger Günther , Natarajan Priyamvada
Published: February 2022

We explore the observational implications of a model in which primordial black holes (PBHs) with a broad birth mass function ranging in mass from a fraction of a solar mass to ∼106
M
⊙, consistent with current observational limits, constitute the dark matter (DM) component in the universe. The formation and evolution of dark matter and baryonic matter in this PBH-Λ cold dark matter (ΛCDM) universe are presented. In this picture, PBH-DM mini-halos collapse earlier than in standard ΛCDM, baryons cool to form stars at z ∼ 15–20, and growing PBHs at these early epochs start to accrete through Bondi capture. The volume emissivity of these sources peaks at z ∼ 20 and rapidly fades at lower redshifts. As a consequence, PBH DM could also provide a channel to make early black hole seeds and naturally account for the origin of an underlying DM halo–host galaxy and central black hole connection that manifests as the M
bh–σ correlation. To estimate the luminosity function and contribution to integrated emission power spectrum from these high-redshift PBH-DM halos, we develop a halo occupation distribution model. In addition to tracing the star formation and reionization history, it permits us to evaluate the cosmic infrared and X-ray backgrounds. We find that accretion onto PBHs/active galactic nuclei successfully accounts for the detected backgrounds and their cross-correlation, with the inclusion of an additional IR stellar emission component. Detection of the deep IR source count distribution by the James Webb Space Telescope could reveal the existence of this population of high-redshift star-forming and accreting PBH DM.
Dramatic Changes in the Observed Velocity of the Accretion Disk Wind in MCG-03-58-007 Are Revealed by XMM-Newton and NuSTAR
Authors: Braito V. , Reeves J. N. , Matzeu G. , Severgnini P. , Ballo L. , Cicone C. , Ceca R. Della , Giustini M. , Sirressi M.
Published: February 2022

Past X-ray observations of the nearby Seyfert 2 MCG-03-58-007 revealed the presence of a powerful and highly variable disk wind, where two possible phases outflowing with v
out1/c ∼ −0.07 and v
out2/c ∼ −0.2 were observed. Multi-epoch X-ray observations, covering the period from 2010 to 2018, showed that the lower-velocity component is persistent, as it was detected in all the observations, while the faster phase outflowing with v
out2/c ∼ −0.2 appeared to be more sporadic. Here we present the analysis of a new monitoring campaign of MCG-03-58-007 performed in 2019 May–June and consisting of four simultaneous XMM-Newton and NuSTAR observations. We confirm that the disk wind in MCG-03-58-007 is persistent, as it is detected in all the observations, and powerful, having a kinetic power that ranges between 0.5% and 10% of the Eddington luminosity. The highly ionized wind (log(ξ/erg cm s−1) ∼ 5) is variable in both the opacity and, remarkably in its velocity. This is the first time where we have observed a substantial variability of the outflowing velocity in a disk wind, which dropped from v
out/c ∼ −0.2 (as measured in the first three observations) to v
out/c ∼ −0.074 in just 16 days. We conclude that such a dramatic and fast variability of the outflowing velocity could be due to the acceleration of the wind, as recently proposed by Mizumoto et al. Here, the faster wind, seen in the first three observations, is already accelerated to v
out/c ∼ −0.2, while in the last observation our line of sight intercepts only the slower, pre-accelerated streamline.
Correlated Spatio-temporal Evolution of Extreme-Ultraviolet Ribbons and Hard X-Rays in a Solar Flare
Authors: Naus S. J. , Qiu J. , DeVore C. R. , Antiochos S. K. , Dahlin J. T. , Drake J. F. , Swisdak M.
Published: February 2022

We analyze the structure and evolution of ribbons from the M7.3 SOL2014-04-18T13 flare using ultraviolet images from the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), magnetic data from the SDO/Helioseismic and Magnetic Imager, hard X-ray (HXR) images from the Reuven Ramaty High Energy Solar Spectroscopic Imager, and light curves from the Fermi/Gamma-ray Burst Monitor, in order to infer properties of coronal magnetic reconnection. As the event progresses, two flare ribbons spread away from the magnetic polarity inversion line. The width of the newly brightened front along the extension of the ribbon is highly intermittent in both space and time, presumably reflecting nonuniformities in the structure and/or dynamics of the flare current sheet. Furthermore, the ribbon width grows most rapidly in regions exhibiting concentrated nonthermal HXR emission, with sharp increases slightly preceding the HXR bursts. The light curve of the ultraviolet emission matches the HXR light curve at photon energies above 25 keV. In other regions the ribbon-width evolution and light curves do not temporally correlate with the HXR emission. This indicates that the production of nonthermal electrons is highly nonuniform within the flare current sheet. Our results suggest a strong connection between the production of nonthermal electrons and the locally enhanced perpendicular extent of flare ribbon fronts, which in turn reflects the inhomogeneous structure and/or reconnection dynamics of the current sheet. Despite this variability, the ribbon fronts remain nearly continuous, quasi-one-dimensional features. Thus, although the reconnecting coronal current sheets are highly structured, they remain quasi-two-dimensional and the magnetic energy release occurs systematically, rather than stochastically, through the volume of the reconnecting magnetic flux.
Dynamical Friction, Buoyancy, and Core-stalling. I. A Nonperturbative Orbit-based Analysis
Authors: Banik Uddipan , van den Bosch Frank C.
Published: February 2022

We examine the origin of dynamical friction using a nonperturbative, orbit-based approach. Unlike the standard perturbative approach, in which dynamical friction arises from the LBK torque due to pure resonances, this alternative, complementary view nicely illustrates how a massive perturber significantly changes the energies and angular momenta of field particles on near-resonant orbits, with friction arising from an imbalance between particles that gain energy and those that lose energy. We treat dynamical friction in a spherical host system as a restricted three-body problem. This treatment is applicable in the “slow” regime, in which the perturber sinks slowly and the standard perturbative framework fails due to the onset of nonlinearities. Hence, it is especially suited to investigate the origin of core-stalling: the cessation of dynamical friction in central constant-density cores. We identify three different families of near-corotation-resonant orbits that dominate the contribution to dynamical friction. Their relative contribution is governed by the Lagrange points (fixed points in the corotating frame). In particular, one of the three families, which we call Pac-Man orbits because of their appearance in the corotating frame, is unique to cored density distributions. When the perturber reaches a central core, a bifurcation of the Lagrange points drastically changes the orbital makeup, with Pac-Man orbits becoming dominant. In addition, due to relatively small gradients in the distribution function inside a core, the net torque from these Pac-Man orbits becomes positive (enhancing), thereby effectuating a dynamical buoyancy. We argue that core-stalling occurs where this buoyancy is balanced by friction.
DECi-hertz Interferometer Gravitational-wave Observatory: Forecast Constraints on the Cosmic Curvature with LSST Strong Lenses
Authors: Cao Shuo , Liu Tonghua , Biesiada Marek , Liu Yuting , Guo Wuzheng , Zhu Zong-Hong
Published: February 2022

In this paper, we aim to use the DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO), a future Japanese space gravitational-wave antenna sensitive to the frequency range between LISA and ground-based detectors, to provide gravitational-wave constraints on the cosmic curvature at z ∼ 5. In the framework of the well-known distance sum rule, the perfect redshift coverage of the standard sirens observed by DECIGO, compared with lensing observations including the source and lens from LSST, makes such cosmological-model-independent tests more natural and general. Focusing on three kinds of spherically symmetric mass distributions for the lensing galaxies, we find that the cosmic curvature is expected to be constrained with the precision of ΔΩ
K
∼ 10−2 in the early universe (z ∼ 5.0), improving the sensitivity of ET constraints by about a factor of 10. However, in order to investigate this further, the mass-density profiles of early-type galaxies should be properly taken into account. Specifically, our analysis demonstrates the strong degeneracy between the spatial curvature and the lens parameters, especially the redshift evolution of the power-law lens index parameter. When the extended power-law mass-density profile is assumed, the weakest constraint on the cosmic curvature can be obtained, whereas the addition of DECIGO to the combination of LSST+DECIGO does improve significantly the constraint on the luminosity–density slope and the anisotropy of the stellar velocity dispersion. Therefore, our paper highlights the benefits of synergies between DECIGO and LSST in constraining new physics beyond the standard model, which could manifest themselves through accurate determination of the cosmic curvature.
No Such Thing as a Simple Flare: Substructure and Quasi-periodic Pulsations Observed in a Statistical Sample of 20 s Cadence TESS Flares
Authors: Howard Ward S. , MacGregor Meredith A.
Published: February 2022

A 20 s cadence Transiting Exoplanet Survey Satellite monitoring campaign of 226 low-mass flare stars during Cycle 3 recorded 3792 stellar flares of ≥1032 erg. We explore the time-resolved emission and substructure in 440 of the largest flares observed at high signal-to-noise, 97% of which released energies of ≥1033 erg. We discover degeneracy present at 2 minute cadence between sharply peaked and weakly peaked flares is common, although 20 s cadence breaks these degeneracies. We better resolve the rise phases and find 46% of large flares exhibit substructure during the rise phase. We observe 49 candidate quasi-periodic pulsations (QPP) and confirm 17 at ≥3σ. Most of our QPPs have periods less than 10 minutes, suggesting short-period optical QPPs are common. We find QPPs in both the rise and decay phases of flares, including a rise-phase QPP in a large flare from Proxima Cen. We confirm that the Davenport et al. template provides a good fit to most classical flares observed at high cadence, although 9% favor Gaussian peaks instead. We characterize the properties of complex flares, finding 17% of complex flares exhibit “peak-bump” morphologies composed of a large, highly impulsive peak followed by a second, more gradual Gaussian peak. We also estimate the UVC surface fluences of temperate planets at flare peak and find one-third of 1034 erg flares reach the D90 dose of Deinococcus radiodurans in just 20 s in the absence of an atmosphere.
Bayesian Inference of Globular Cluster Properties Using Distribution Functions
Authors: Eadie Gwendolyn M. , Webb Jeremy J. , Rosenthal Jeffrey S.
Published: February 2022

We present a Bayesian inference approach to estimating the cumulative mass profile and mean-squared velocity profile of a globular cluster (GC) given the spatial and kinematic information of its stars. Mock GCs with a range of sizes and concentrations are generated from lowered-isothermal dynamical models, from which we test the reliability of the Bayesian method to estimate model parameters through repeated statistical simulation. We find that given unbiased star samples, we are able to reconstruct the cluster parameters used to generate the mock cluster and the cluster’s cumulative mass and mean-squared velocity profiles with good accuracy. We further explore how strongly biased sampling, which could be the result of observing constraints, might affect this approach. Our tests indicate that if we instead have biased samples, then our estimates can be off in certain ways that are dependent on cluster morphology. Overall, our findings motivate obtaining samples of stars that are as unbiased as possible. This may be achieved by combining information from multiple telescopes (e.g., Hubble and Gaia), but will require careful modeling of the measurement uncertainties through a hierarchical model, which we plan to pursue in future work.
Kinetic-scale Flux Ropes: Observations and Applications of Kinetic Equilibrium Models
Authors: Yang 杨 Fan 帆 , Zhou 周 Xu-Zhi 煦之 , Li 李 Jing-Huan 京寰 , Zong 宗 Qiu-Gang 秋刚 , Yao 姚 Shu-Tao 淑涛 , Shi 史 Quan-Qi 全岐 , Artemyev Anton V.
Published: February 2022

Magnetic flux ropes with helical field lines and a strong core field are ubiquitous structures in space plasmas. Recently, kinetic-scale flux ropes have been identified by high-resolution observations from the Magnetospheric Multiscale (MMS) spacecraft in the magnetosheath, which have drawn a lot of attention because of their nonideal behavior and internal structures. Detailed investigation of flux rope structure and dynamics requires the development of realistic kinetic models. In this paper, we generalize an equilibrium model to reconstruct a kinetic-scale flux rope previously reported via MMS observations. The key features in the magnetic field and electron pitch-angle distribution measurements of all four satellites are simultaneously reproduced in this reconstruction. Besides validating the model, our results also indicate that the anisotropic features previously attributed to asymmetric magnetic topologies in the magnetosheath can be alternatively explained by the spacecraft motion in the flux rope rest frame.
A new species and new combination in basally flowering Vietnam Costaceae
Authors: Leong-Škorničková Jana , Böhmová Alžběta , Trần Hữu Đăng
Published: February 2022

Cheilocostus candidussp. nov. (Costaceae), a basally flowering spiral ginger with cream white flowers from southern Vietnam, is described and illustrated here. A new combination, Cheilocostus tonkinensis (Gagnep.) Škorničk., is proposed here and the lectotype is designated. A key to Cheilocostus in Vietnam is included.
Pliocene-Pleistocene dispersal bring along low inter species diversity between Vimba species based on multilocus analysis
Authors: Kalaycı Gökhan
Published: February 2022

This study investigates phylogenetic and phylogeographic relationships of Vimba species using mitochondrial cytochrome b (cyt b) (1023 bp) and cytochrome c oxidase subunit I (COI) barcoding region (652 bp) genes. Ninety-one samples from 36 populations for the cyt b gene and 67 samples from 20 populations for the COI were analyzed. We identified 29 haplotypes and calculated overall haplotype diversity as Hd: 0.907 ± 0.015 for cyt b. We also identified 13 COI haplotypes and calculated overall haplotype diversity as 0.826 ± 0.026 for this marker. The phylogenetic analysis of Vimba species reveals the presence of four clades, based on concatenated cyt b and COI sequences. The first and second clade consist of Vimba vimba Western lineage, and Vimba vimba Caspian lineage, while the third and fourth clade consist of Vimba mirabilis and Vimba melanops. Based on haplotype network analyses and phylogeographic inferences, the Vimba genus is monophyletic, and its species dispersed in the Pleistocene era.
Les absences de l’absentéisme scolaire dans les médias : masquer les causes en dénonçant les dérives
Authors: Pons Xavier
Published: February 2022

Cet article analyse la médiatisation de l’absentéisme scolaire dans la presse écrite nationale en France entre 1997 et 2020 à partir de corpus de documents et d’entretiens individuels. Adoptant une perspective à la croisée de la sociologie de l’éducation, de l’action publique et des problèmes publics, il montre que cette médiatisation, grandement centrée sur l’actualité gouvernementale et les conséquences négatives de l’absentéisme, s’explique par une configuration de dicibilité d’ensemble dans laquelle prédomine la parole politique au détriment de la parole experte. Dans ce système d’interdépendances qui définit les frontières du dicible et du non-dicible, les médias ne sont pas que contraints, ils jouent un rôle majeur de cadrage du problème public de l’absentéisme et des solutions couplées à ce dernier. Ils contribuent en cela à la production structurelle d’une ignorance collective sur le sujet, en invisibilisant des travaux et des points de vue qui insistent sur la complexité du processus d’absentéisme et des facteurs sociaux qui en sont à l’origine.
Ce que la presse écrite jeunesse donne à lire et à voir : le genre du sport
Authors: Hidri Neys Oumaya , Juskowiak Hugo , Bohuon Anaïs , Bréhon Jean
Published: February 2022

En mettant en scène des sportives et des sportifs, en diffusant à grande échelle des modèles de sportivité, les médias doivent être considérés comme des instances de socialisation. L’article opère une analyse quantitative paramétrée d’un corpus d’une publication, référence essentielle de la presse écrite quotidienne enfantine des 6-10 ans, Le Petit Quotidien , de 2009 à 2019. Quelle place accorde-t-il aux sportifs et sportives ? Quelles activités sportives retient-il dans les articles et photographies publiés ? La mise en visibilité des sportives y est-elle la même que celle des sportifs ? Existe-t-il un traitement genré des activités sportives ? Comment ce journal donne-t-il à lire et à voir le genre du sport ? L’article montre que les sportives, sans être complètement invisibilisées, demeurent reléguées au second plan, confirmant ainsi pour la presse écrite de jeunesse les constats produits par ailleurs.
Inégalités sociales, dispositions et usages du numérique
Authors: Granjon Fabien
Published: February 2022

Cet article revient sur les notions d’e-exclusion et d’illectronisme qui traversent la littérature dédiée à la fracture numérique. Aussi intéressantes soient-elles, ces notions accordent peu d’importance aux processus de socialisation des usagers de l’informatique connectée, processus qui configurent pourtant leurs pratiques numériques. Le concept de capital numérique, plus à même de prendre en compte l’épaisseur sociale des cadres d’usage, permet de mieux considérer les liens entre pratiques numériques et dynamiques de socialisation. Pour mettre complètement en regard ces deux aspects, il est utile de travailler une problématisation des usages sociaux du numérique attentive aux dispositions des usagers. Elle favorise la saisie des usages de l’informatique connectée au croisement des propriétés sociales des acteurs, des situations et des technologies.
Jean-Claude Éloy et l’Orient : un exotisme postcolonial ?
Authors: Rebouh Sabrina
Published: February 2022

Jean-Claude Éloy est un compositeur passionné de musiques extra-européennes – en particulier de musique japonaise – qui revendique un multiculturalisme militant et refuse farouchement que sa démarche puisse être associée à un quelconque exotisme. Pourtant, et sans que la sincérité de son positionnement idéologique puisse être remise en cause, certaines ambiguïtés apparaissent au fur et à mesure de l’étude de sa production. Ainsi, si l’exotisme de surface caractéristique du cœur du xix e  siècle a bien disparu au profit d’un intérêt largement documenté pour les cultures musicales non occidentales, on n’en décèle pas moins, dans l’œuvre comme dans la riche production écrite du compositeur, la permanence de thèmes caractéristiques de cet exotisme. L’étude s’appuie en premier lieu sur la définition, à partir du champ littéraire, des thèmes qui sous-tendent l’expression d’un exotisme traditionnel. L’enjeu de l’analyse repose ensuite sur les modalités de traduction de ces thèmes littéraires en sèmes musicaux et leur repérage dans l’œuvre mais également leur articulation avec la sensation d’altérité qui fonde tout exotisme. L’élucidation du paradoxe relevé dans l’œuvre nous amène enfin à formuler l’hypothèse d’un exotisme postcolonial.
La musique de film révélatrice d’engagement : l’exemple du Destin de Youssef Chahine
Authors: Guermazi Amal
Published: February 2022

Chahine conjugue dans son cinéma ses deux vocations : engagement et divertissement. Dans Le Destin , il parvient à raconter le fanatisme religieux à l’origine de l’autodafé de l’œuvre d’Averroès avec beaucoup de fantaisie, de danses et de musiques. Ainsi, cet article s’intéresse aux fonctions de la musique dans le cinéma du réalisateur. Comment parvient-t-elle à dépasser son rôle habituel, celui de l’animation neutre dans le Septième art arabe, pour devenir une véritable arme contre un fondamentalisme rampant dans l’Égypte des années 1990 ? Afin de répondre à cette problématique, l’analyse se focalise d’abord sur l’organisation structurelle des chansons dans le film. Une fois leurs disposition et évolution discursives dans le récit dramaturgique relevées, la question de leur portée réelle émerge et peut enfin être dévoilée. Il est ainsi constaté que la musique dans le cinéma de Chahine incarne une dimension politique qui, à cause de la censure, est dissimulée derrière un faux semblant de divertissement.