bluuebunny/crossref_metadata_2025_split huggingface dataset:
Safety impact of cooperative adaptive cruise control vehicles’ degradation under spatial continuous communication interruption
Authors: Yu Weijie , Hua Xuedong , Zhao De , Wang Wei , Xiang Yun 
Published: November 2021

AbstractCooperative adaptive cruise control is recognised as an effective means to reduce the rear‐end collision caused by the delayed reaction and improper driving behaviours of manually driven vehicles. However, vehicle‐to‐vehicle communication, as the key to collect information for the cooperative adaptive cruise control system, is likely to be interrupted by malicious attacks and equipment failures. When communication interruption occurs, sensors of the adaptive cruise control system will replace vehicle‐to‐vehicle communication for information collection, that is, cooperative adaptive cruise control vehicles degrade to adaptive cruise control vehicles automatically, causing an increased rear‐end collision risk. This study aims to investigate the safety impact of cooperative adaptive cruise control vehicles’ degradation under spatial continuous communication interruption. A mixed platoon, consisting of cooperative adaptive cruise control vehicles, adaptive cruise control vehicles, manually driven vehicles, and improved manually driven vehicles with information‐sending devices, is simulated with the realistic cooperative adaptive cruise control and adaptive cruise control model, and the intelligent driver model. Different platoon forms are discussed by adjusting the quantity and position of manually driven vehicles in the mixed platoon. The results show that manually driven vehicles can effectively block the backward extension of speed fluctuation and reduce the rear‐end collision risk under the spatial continuous communication interruption. Nevertheless, equipping manually driven vehicles with information‐sending devices weakens the ability to defend against communication interruption.
Radar main‐lobe jamming suppression and identification based on robust whitening Blind Source Separation and Convolutional Neural Networks
Authors: Gao Sheng , Yang Xiaopeng , Lan Tian , Han Bowen , Sun Haoran , Yu Zhichao 
Published: November 2021

AbstractThe main‐lobe jamming causes serious degradation of radar system performance in practical applications. In recent years, the Blind Source Separation (BSS) method has been applied to suppress the main‐lobe jamming. However, the received echoes of target and jamming cannot be effectively identified while the robustness of the conventional BSS method is poor due to the influence of system noise. To tackle these problems, a radar main‐lobe jamming suppression and identification method is proposed based on robust whitening BSS and Convolutional Neural Networks methods. First, the target echoes and jamming are separated by the proposed robust whitening BSS method. An iterative optimisation method is proposed to obtain the robust whitening matrix, and sufficient conditions are provided for solvability. Then, a Target echo and Jamming Identification Network (TJINet) is proposed to identify the signals after the robust whitening BSS. The proposed TJINet method uses residual blocks and branch structures to improve classification performance and utilises asymmetric convolution blocks to extract subtle features between the target echo and deceptive jamming. Simulation and experimental results show that the proposed method has better jamming suppression performance than the traditional methods under low signal‐to‐noise ratio (SNR) conditions, the algorithm converges faster, and also can stably identify the target echo and jamming signals.
The CubeSpec space mission
Authors: Bowman D. M. , Vandenbussche B. , Sana H. , Tkachenko A. , Raskin G. , Delabie T. , Vandoren B. , Royer P. , Garcia S. , Van Reeth T. ,   the CubeSpec Collaboration
Published: November 2021

Context. There is currently a niche for providing high-cadence, high resolution, time-series optical spectroscopy from space, which can be filled by using a low-cost cubesat mission. The Belgian-led ESA/KU Leuven CubeSpec mission is specifically designed to provide space-based, low-cost spectroscopy with specific capabilities that can be optimised for a particular science need. Approved as an ESA in-orbit demonstrator, the CubeSpec satellite’s primary science objective will be to focus on obtaining high-cadence, high resolution optical spectroscopic data to facilitate asteroseismology of pulsating massive stars.
Aims. In this first paper, we aim to search for pulsating massive stars suitable for the CubeSpec mission, specifically β Cep stars, which typically require time-series spectroscopy to identify the geometry of their pulsation modes.
Methods. Based on the science requirements needed to enable asteroseismology of massive stars with the capabilities of CubeSpec’s spectrograph, we combined a literature study for pulsation with the analysis of recent high-cadence time-series photometry from the Transiting Exoplanet Survey Satellite (TESS) mission to classify the variability for stars brighter than V ≤ 4 mag and between O9 and B3 in spectral type.
Results. Among the 90 stars that meet our magnitude and spectral type requirements, we identified 23 promising β Cep stars with high-amplitude (non-)radial pulsation modes with frequencies below 7 d−1. Using further constraints on projected rotational velocities, pulsation amplitudes, and the number of pulsation modes, we devised a prioritised target list for the CubeSpec mission according to its science requirements and the potential of the targets for asteroseismology. The full target catalogue further provides a modern TESS-based review of line profile and photometric variability properties among bright O9–B3 stars.
Ambulante spezialfachärztliche Versorgung: ein einfacher webbasierter Weg zu den Abrechnungsmöglichkeiten und -ziffern
Authors: Schäfer David , Schäfer Wolfgang 
Published: November 2021

ZusammenfassungDie ambulante spezialfachärztliche Versorgung (ASV) wurde eingeführt, um die Diagnostik und Behandlung komplexer, schwer therapierbarer und/oder seltener Erkrankungen zu verbessern. Bei einer Vielzahl von Untergruppen in der ASV ist es schwierig zu erkennen, an welcher dieser Untergruppen die Fachgruppe Nuklearmedizin beteiligt ist und welche Ziffern abgerechnet werden können. Ziel war es daher, einen einfachen webbasierten Zugangsweg zu den Abrechnungsmöglichkeiten und -ziffern zu entwickeln.
Long-term effects of tillage systems on liming efficiency, soil chemical properties and wheat yield in Southern Brazil
Authors: Silva Sérgio Ricardo , dos Santos Henrique Pereira , Lollato Rômulo Pisa , Santi Anderson , Fontaneli Renato Serena 
Published: November 2021

Context Sustainable management of the soil is one of the pillars of conservation agriculture (CA). Aims The objective of this study was to evaluate the long-term effects of soil management systems (SMS) on liming efficiency, soil chemical properties and wheat yield. Methods This study was part of a long-term experiment established in 1986 in Passo Fundo, Rio Grande do Sul, Brazil, but using data from 2008 to 2015 to explore the effects of agricultural lime applied in 2008. The experiment was laid out in a split-plot design where the main plot (SMS) were arranged in randomised blocks and the cropping systems (sub-plot treatments) were randomised within the main plots. This study assessed the effects of the SMS; i.e. two CA systems [no-tillage (NT) and reduced tillage] and two conventional tillage (CT) systems (disk ploughing + disk harrowing annually, and mouldboard ploughing + disk harrowing annually). Key results The NT system was the most sustainable due to improvements in soil organic carbon concentration. After liming, CT systems were more effective than CA systems in decreasing Al3+ toxicity and increasing soil pH and Ca2+ and Mg2+ concentrations at deeper soil layers. The NT system had a considerable advantage over other SMS, due to a greater average wheat yield (18%). Conclusions The SMS evaluated in this study modified chemical properties when compared with the native forest area. The NT system was the least detrimental to soil organic carbon, an important indicator of soil quality. Implications The NT system provided greater average wheat yield (18%), and thus was the most viable SMS for subtropical spring wheat production.
Palatini approach and large-scale magnetogenesis
Authors: Giovannini Massimo 
Published: November 2021

Abstract
Large-scale magnetogenesis is analyzed within the Palatini approach when the gravitational action is supplemented by a contribution that is nonlinear in the Einstein-Hilbert term. While the addition of the nonlinear terms does not affect the scalar modes of the geometry during the inflationary phase, the tensor-to-scalar ratio is nonetheless suppressed. In this context it is plausible to have a stiff phase following the standard inflationary stage provided the potential has a quintessential form. The large-scale magnetic fields can even be a fraction of the nG over typical length scales of the order of the Mpc prior to the gravitational collapse of the protogalaxy.
Energy and multiplicity dependence of hadronic resonance production with ALICE at the LHC
Authors: Badalà Angela 
Published: November 2021

Abstract
The study of hadronic resonances plays an important role both in pp and in heavy-ion collisions. Since the lifetimes of short-lived resonances are comparable with the lifetime of the fireball formed in heavy-ion collisions, regeneration and re-scattering effects can modify the measured yields, especially at low transverse momentum. Measurements in pp collisions at different energies constitute a baseline for studies in heavy-ion collisions and provide constraints for tuning QCD-inspired event generators. Furthermore, high multiplicity pp collisions, where the density and the volume of the system are expected to be larger compared to minimum bias pp collisions, can help in the search for the onset of collective phenomena. Here we present recent results on short-lived hadronic resonances obtained by the ALICE experiment at LHC energies in different collision systems (pp, p–Pb and Pb–Pb) including new results obtained in Xe–Xe collisions. The ALICE results on transverse momentum spectra, yields and their ratios to long-lived particles will be discussed.
Measurements of

Λc+

in pp, p–Pb and Pb–Pb collisions with ALICE at the LHC
Authors: Hills C 
Published: November 2021

Abstract
The baryon-to-meson ratio

Λ
c
+

/

D
0

and the nuclear modification factor RAA in the charm sector are important observables to gain an understanding of how charm quarks hadronise and lose energy in the Quark-Gluon Plasma produced in heavy-ion collisions. In this contribution, recent measurements performed with the ALICE detector in pp, p–Pb and Pb–Pb collisions at 5.02 TeV are presented and compared with previous measurements in pp collisions at 7 TeV, measurements by the LHCb Collaboration and theoretical model predictions.
Features of the near-wall flow in a vortex chamber with an end-wall swirler
Authors: Abdrakhmanov R Kh 
Published: November 2021

Abstract
The results of a study of the near-wall flow of air in a vortex chamber with an end-wall swirler by the method of oil-flow visualization are presented. The influence of the mass flow rate on a near-wall flow of the vortex chamber is studied. The experimental results demonstrate the presence of separation flow on the cylindrical surface near the blind end-wall, and the non-uniformity of the near-wall flow on the end-wall with swirler. It is shown that when increasing the mass flow rate, the separation zone shifts to the blind end-wall, and its width decreases. In addition, distributions of the swirl angle of the flow on the cylindrical wall along the height of the chamber are obtained.
Control model of parallel functioning production modules as fuzzy Petri nets
Authors: Mustafayev V A , Zeynalabdiyeva I S , Kravets O Ja 
Published: November 2021

Abstract
The article presents the results of research of Data Mining methods with Microsoft SQL Server. Microsoft Clustering algorithm was used for improving the effectiveness of medical prevention and treatment in a cohort of patients with arterial hypertension. There are rationales for monitoring of cardiovascular risk and desire to correct the risk with Data Mining at medical decision support systems. Authors used medical and sociological monitoring data from regional clinical hospital. The segmentation of arterial hypertension patients was performed using Microsoft Clustering algorithm. As a result, a quantitative assessment of the population profile for patients with arterial hypertension was obtained. The authors presented diagrams and profiles of clusters. They were compared. The developed approach is applied for decision support at regional health information management system for reduce of cardiovascular risk.
Information technologies for creating spatiotemporal modems multiposition active-passive radar systems
Authors: Zhukov A O , Zhilyakov E G , Oleynik I I , Orishchuk S G , Fedorov P A , Kartsan I N 
Published: November 2021

Abstract
The methods of synthesis of the directional diagram of active transmitting antenna arrays when receiving signals reflected from radar targets are considered. It is shown that when using multifrequency orthogonal coherent signals in the elements and addressable access at their reception it is possible to provide a small level of the side lobes of the spatial uncertainty function in a given sector of observation by selecting the type of intrapulse modulation of partial signals. Orthogonalization of antenna basis of transmitting and receiving antennas allows digital spectral-correlation processing of samples of aggregate signal from each target to solve the technological problem of multidimensional observation space in multiposition systems of coherent radiolocation when detecting, resolving, estimating coordinates and motion parameters of targets. The results of simulation modeling of spatio-temporal radar modems implemented according to the stated principles are given.
Influence of low-energy proton irradiation on the effective lifetime in the space charge region of silicon n+-p junctions
Authors: Bogatov N M , Grigoryan L R , Kovalenko M S , Volodin V S , Voloshin M A 
Published: November 2021

AbstractThe effect of low-energy proton irradiation on the pulse characteristics of siliconn+-p-p+structures is analyzed. It is shown that irradiation with protons with an energy of 180 keV and a dose of 1015cm−2creates a region with an effective lifetime of 5.5·10−8s in the space charge region of then+-pjunction. Such elements can be used to create high-speed photodiodes with an operating modulation frequency of 18 MHz.
Shape measures of generalized beta distributions
Authors: Polosin V G 
Published: November 2021

Abstract
This paper presents shape measures for generalized beta distributions that unit many subfamilies of distributions. For the study of complex systems, the information entropy of the whole family of the generalized beta distribution is obtained. The paper uses the interval of entropy uncertainty as an estimate of the entropy uncertainty for probable models, which are given in units of an observable random variable. The entropy uncertainty interval was used to construct the entropy coefficient of unbiased subfamilies of the generalized beta distribution. Particular entropy coefficients are given for frequently used subfamilies of beta distribution, that greatly facilitates the use of coefficients as independent information measures in determining the shape of models. The paper contains the most general formulas for probabilistic measures of the distributions shape also.
Analysis of the engineering mathematical model of the physical properties of a three-layer hydroacoustic screen with anisotropic components
Authors: Storozhev S V , Storozhev V I , Bolnokin V E , Sorokin S A 
Published: November 2021

Abstract
A numerical-analytical technique for analyzing the physical effects of the formation of fields of hydroacoustic waves in the area in front of a flat three-layer hydroacoustic screen and in the space behind the screen at normal incidence of a stationary hydroacoustic wave on it is presented. The engineering model of the screen uses the assumption that its components are made of anisotropic functional-gradient materials with exponential inhomogeneity in thickness, and thin, absolutely flexible, inextensible coatings can be applied to the outer and contact surfaces of the layers. The technique is based on the analytical integration of the equations of wave deformation of the screen components and obtaining complex amplitude characteristics for the reflected and generated hydroacoustic waves behind the screen when solving a system of algebraic equations with a functional matrix, which follows from the boundary conditions for the investigated problem. Parametric descriptions for the characteristics of the investigated physical fields are obtained and examples of numerical analysis of the considered engineering model are presented.
A method of designing equipment for heat processing of polymer workpieces
Authors: Glebov A O , Karpushkin S V 
Published: November 2021

Abstract
The paper describes a method of designing heating equipment that maintains a predetermined temperature field. The method consists in sequential solution of two problems. At the first stage, the heat generation field was calculated using the stationary heat conduction equation. At the second stage, parametric optimization of the temperature field was performed with reference to the power and configuration limits of the heaters. To test this method, the problem of maintaining a predetermined non-uniform temperature field was solved. A practical example of the application of the method for designing a uniform heating plate used in vulcanizing presses was given. To assess the efficiency of the plate, the results of modeling the heat processing of a workpiece from a rubber mixture were presented.
Principles of discrete-event modeling of physical processes during technical surfaces contact interaction
Authors: Rachishkin A A 
Published: November 2021

Abstract
The article discusses the advantages and disadvantages of computer modeling used in physical experiments field on rough surfaces contact interaction. Methods for constructing the software model are given. The description of a single irregularity in the form of revolution ellipsoid segment is presented and an algorithm for rough surface three-dimensional modeling based on it is proposed. Some assumptions made for generating surface topography do not significantly affect the simulation validity. Taking into account the individual parameters of each irregularity and the algorithm for their distribution make it possible to create inhomogeneous rough surfaces that are close to real ones relative to the physical experiments being carried out. The general principles of the software architecture and the data storage model of discrete-event modeling system of rough surface contact interaction are described. The developed software can be used for modeling the rough surfaces contact interaction, for researching of tribo-interface units’ parameters, predicting the characteristics of frictional interaction and tribotechnical tests computer simulation.
Energy transfer in luminescence composite materials based on mesogenic europium (III) complexes and some semiconducting polymers according to quantum-chemical simulation
Authors: Romanova K A , Galyametdinov Yu G 
Published: November 2021

Abstract
A TDDFT study of energy transfer processes in luminescence composite materials based on mesogenic europium (III) complexes with substituted β-diketones and Lewis bases and some semiconducting polymers is presented. The calculated energies of the lowest singlet and triplet excited states of ligands and polymers were used to construct the energy level diagrams and indentify the main channels of intramolecular energy transfer. A system of a complex and a polymer, which is most preferable for practical application in optoelectronics, was selected. The simulated data agree well with the experiment.
Investigation of the rupture of a synthetic tape within the framework of the percolation theory
Authors: Kozlitin R A , Udodov V N 
Published: November 2021

Abstract
Within the framework of the percolation theory (bond problem), a new model of breaking a complex synthetic tape is proposed as a continuous-type phase transition when the state jump is zero. The percolation threshold and accompanying characteristics are calculated for the model of rupture of a synthetic reinforced tape when flowing along the first and second neighbours. The knots of the tape form a strip of a square lattice, the width of which is fixed. All nodes are intact and cannot be damaged, links (tape threads) can be intact and broken (blocked). The dependences of the percolation threshold in the bond problem and the relative deviation of the threshold from the ribbon length are calculated. It is proved that for the simplest model of one-dimensional percolation with percolation along the nearest neighbours (the problem of nodes), the percolation threshold in the thermodynamic limit is equal to unity. It is shown that, with an accuracy of 10%, the percolation threshold for a sufficiently long ribbon is equal to unity. This indicates that the system is quasi-one-dimensional. Thus, using the method of computer simulation, the percolation threshold, root-mean-square and relative threshold deviations were calculated. The critical susceptibility index was also calculated. In contrast to the usual percolation problem, in the proposed model it makes sense to consider only the region above the percolation threshold. The proposed model can be generalized to the case when nodes are also damaged (blocked), then we come to a mixed percolation model, which is supposed to be considered in the future.
Coherent demodulation of the two-level APSK signals with the symbol amplitude estimation
Authors: Chernoyarov O V , Glushkov A N , Litvinenko V P , Mironov V A , Salnikova A V 
Published: November 2021

Abstract
The study focuses on the algorithms for the coherent demodulation of the two-level amplitude phase-shift keyed signals with an estimate of the received symbol amplitude carried out by its relative comparison with the preceding symbol amplitude. Determining calibrated values of the symbol amplitudes in order to compare them with the preset threshold values is considered unnecessary in this case. Phase demodulation is implemented based on the phase detector of the multi-level phase-shift keyed signals. Symbol amplitudes are determined by the quadrature channels responses. Both analog and digital demodulation algorithms are considered. Simulation of the demodulation algorithm is carried out.
Influence of the radiation pattern errors for the correlation interferometer
Authors: Fateev A A , Tokarev A B , Chernoyarov O V , Salnikova A V 
Published: November 2021

Abstract
While designing phase-correlation direction finders, as antenna components, the non-directional ones are usually applied. Mounting the non-directional antenna components provides certain new options but makes the bearing computation procedure more problematic. In the present paper, the feasibility of using the directional antenna components is discussed and confirmed in terms of its positive influence on the stability of the bearing results in the case when the deviations of the implementations of the actual diagrams of the antenna components from their reference model occur.
A rectangular radio pulse propagation in a selectively absorbing medium
Authors: Bukhman N S , Kulikova A V 
Published: November 2021

Abstract
A pulse with rectangular envelope propagation, in which carrier frequency is close to the medium spectral absorption line’s one frequency, is considered. It is shown that when the signal carrier frequency is shifted relative to the spectral line centre, the primary interference and the response signal can lead to the total signal significant oscillations over time.