bluuebunny/crossref_metadata_2025_split huggingface dataset:
Height variation of magnetic field and plasma flows in isolated bright points
Authors: Kuckein Christoph 
Published: September 2019

Aims. The expansion with height of the solar photospheric magnetic field and the plasma flows is investigated for three isolated bright points (BPs).
Methods. The BPs were observed simultaneously with three different instruments attached to the 1.5 m GREGOR telescope: (1) filtergrams of Ca II H and blue continuum (4505 Å) with the HiFI, (2) imaging spectroscopy of the Na I D2 line at 5890 Å with the GFPI, and (3) slit spectropolarimetry in the 1 μm spectral range with the GRIS. Spectral-line inversions were carried out for the Si I 10827 Å Stokes profiles.
Results. Bright points are identified in the Ca II H and blue continuum filtergrams. Moreover, they are also detected in the blue wing of the Na I D2 and Si I 10827 Å lines, as well as in the Ca I 10839 Å line-core images. We carried out two studies to validate the expansion of the magnetic field with height. On the one hand, we compare the photospheric Stokes V signals of two different spectral lines that are sensitive to different optical depths (Ca I vs. Si I). The area at which the Stokes V signal is significantly large is almost three times larger for the Si I line – sensitive to higher layers – than for the Ca I one. On the other hand, the inferred line-of-sight (LOS) magnetic fields at two optical depths (log τ = −1.0 vs. −2.5) from the Si I line reveal spatially broader fields in the higher layer, up to 51% more extensive in one of the BPs. The dynamics of BPs are tracked along the Na I D2 and Si I lines. The inferred flows from Na I D2 Doppler shifts are rather slow in BPs (≲1 km s−1). However, the Si I line shows intriguing Stokes profiles with important asymmetries. The analysis of these profiles unveils the presence of two components, a fast and a slow one, within the same resolution element. The faster one, with a smaller filling factor of ∼0.3, exhibits LOS velocities of about 6 km s−1. The slower component is slightly blueshifted.
Conclusions. The present work provides observational evidence for the expansion of the magnetic field with height. Moreover, fast flows are likely present in BPs but are sometimes hidden because of observational limitations.
On the Mechanism of the Stevens Rearrangement
Authors: Baidilov Daler 
Published: September 2019

The reaction mechanism for the Stevens rearrangement is one of the most controversial reaction mechanisms in organic chemistry. This account will address that controversy reviewing the experimental as well as some computational results.1	Introduction2	Evolution of the Mechanistic Knowledge2.1	Stevens (1928)2.2	Stevens (1930)2.3	Stevens (1932)2.4	Campbell (1946)2.5	Hauser (1951)2.6	Kline (1952)2.7	Lepley (1969)2.8	Baldwin (1970)3	Computational Investigations4	[2,3]-Stevens Rearrangement?5	Conclusion
More than one way out
Authors: Poletto Cecilia 
Published: September 2019

AbstractIn this article I will show that there is not a single diachronic path that leads to the loss of the verb second property so that different languages can have different ways towards a non V2 grammar. I will also show that the progressive loss of subject inversion contexts is not the only factor that played a role in the change, because there are V2 languages in which nominal subject inversion was never attested but they are still V2, i.e. they have I to C movement. I will identify various factors which may play a role and are related to the type of verb second found in different languages. I will consider various types of factors and show that they can play a role or not in the loss of V2 depending on the type of V2 that the language displays. I will also identify an additional factor that has not been considered in the literature namely the type of complementizer system: a change in this area can contribute to destabilizing the V2 grammar.
On the left periphery of three languages of Northern Italy
Authors: Cognola Federica 
Published: September 2019

AbstractThrough a focus on the properties of subject-finite verb inversion and XP fronting in three relaxed V2 languages, namely Cimbrian, Ladin and Mòcheno, this paper aims to widen and refine our understanding of relaxed V2 languages, i.e. languages in which the V2 property should be understood in a technical sense as obligatory V-to-C movement, not as a simple description referring to linearisation (Benincà 2006,2013;Ledgeway 2016). It will be shown that inversion differs across relaxed V2 languages in two ways. In a first subtype, inversion is not associated with any marked pragmatic interpretation of the lexical subject and the subject appears in an A position in the IP area: this type is instantiated by Old Italian (Benincà 2006,Poletto 2014). A second option, instantiated by the languages considered in this paper, is that the lexical subject receives a pragmatically marked interpretation which is encoded in a Functional Projection (FP) in thevP periphery (Belletti 2004,Poletto 2006). This paper confirms that V3/V4 word orders involve the presence of a double articulation for foci and wh-elements, which appear in different positions in the CP layer in relaxed V2 languages (Poletto 2002,Wolfe 2015 a,b). It also contributes to our understanding of the syntax of topics in relaxed V2 languages by showing that (i) topics can be moved to CP and (ii) the movement option is not restricted to main clauses lacking an XP in the left periphery; it also occurs in interrogative clauses (unlike in the relaxed V2 varieties considered inWalkden 2014,2015).
Classical spiral spin liquids as a possible route to quantum spin liquids
Authors: Niggemann Nils , Hering Max , Reuther Johannes 
Published: September 2019

Abstract
Quantum spin liquids are long-range entangled phases whose magnetic correlations are determined by strong quantum fluctuations. While an overarching principle specifying the precise microscopic coupling scenarios for which quantum spin-liquid behavior arises is unknown, it is well-established that they are preferably found in spin systems where the corresponding classical limit of spin magnitudes

exhibits a macroscopic ground state degeneracy, so-called classical spin liquids. Spiral spin liquids represent a special family of classical spin liquids where degenerate manifolds of spin spirals form closed contours or surfaces in momentum space. Here, we investigate the potential of spiral spin liquids to evoke quantum spin-liquid behavior when the spin magnitude is tuned from the classical

limit to the quantum S  =  1/2 case. To this end, we first use the Luttinger–Tisza method to formulate a general scheme which allows one to construct new spiral spin liquids based on bipartite lattices. We apply this approach to the two-dimensional square lattice and the three-dimensional hcp lattice to design classical spiral spin-liquid phases which have not been previously studied. By employing the pseudofermion functional renormalization group (PFFRG) technique we investigate the effects of quantum fluctuations when the classical spins are replaced by quantum S  =  1/2 spins. We indeed find that extended spiral spin-liquid regimes change into paramagnetic quantum phases possibly realizing quantum spin liquids. Remnants of the degenerate spiral surfaces are still discernible in the momentum-resolved susceptibility, even in the quantum S  =  1/2 case. In total, this corroborates the potential of classical spiral spin liquids to induce more complex non-magnetic quantum phases.
Imitation modeling of antenna of a hydroacoustic communication channel
Authors: Filippov B I , Shchedrina A S 
Published: September 2019

Abstract
The energy calculation of the hydroacoustic communication channel is divided into a number of interrelated stages: the choice of the operating frequency of the communication line; selection of sonar antennas; determination of the acoustic power of the signal. Experimental studies of hydroacoustic systems require significant financial costs. Therefore, recently, in order to reduce these costs, simulation models of individual nodes or even of the entire hydroacoustic system as a whole are resorted to. This work is devoted to the simulation modeling of a hydroacoustic channel antenna. A schematic diagram of the SKOL-2000R hydroacoustic antenna model is given, and the operating parameters of this model are chosen so that the resonant frequency of the model coincides with the resonant frequency of the original 29.6 kHz.
Models of recognition operators defined in the space of large dimension attributes
Authors: Mirzaev N M , Yu Khaydarova M , Mirzaeva G R , Ibragimova S N 
Published: September 2019

Abstract
The problems of constructing modified recognition operators are considered taking into account the high dimensionality of the feature space. As a basic algorithm, models of recognition algorithms based on radial functions are considered. The main idea of the model of modified recognition operators is the formation of independent subsets of interrelated objects and the allocation of basic objects for each subset of tightly coupled objects. A distinctive feature of the proposed model of algorithms is to determine the appropriate set of distance functions when building a model of discriminating operators. To test the performance of the proposed object model, experimental studies were carried out in solving a number of problems. The main advantage of the proposed recognition operators is the improvement of accuracy and a significant reduction in the volume of computational operations in recognition of unknown objects, which allows them to be used in the construction of recognition systems operating in real time.
Approaches to solving the problem of fuzzy parametric programming in weakly structured objects
Authors: Muhamediyeva D T , Niyozmatova N A 
Published: September 2019

Abstract
The article discusses approaches to solving parametric programming problems with fuzzy initial information, in the case when the constraints and the objective function depend on many parameters. The paper considers an approach in which parameters can be expressed in a more general form of fuzzy sets of their possible values. In this way, we get a new type of mathematical optimization problems containing fuzzy parameters. In this chapter, the consideration of linear optimization problems based on this approach is the essence of fuzzy linear programming.
Approaches to the construction of nonlinear models in fuzzy environment
Authors: Muhamediyeva D T , Sayfiyev J 
Published: September 2019

Abstract
The Bayesian methods to the problems of statistical estimation when building nonlinear models are considered. Bayesian methods can be used to construct linear and nonlinear regression models with non-Gaussian laws for the distribution of probabilities of random observation errors. We consider continuous and discrete processes that can be described by statistical models. For this purpose, a description of computational Bayesian procedures and recommendations for the construction of nonlinear regression models are given introduction.
Assessment of the loaded state of the piston unit cylinder stage taking into account of temperature exposure
Authors: Aistov I P , Vansovich K A 
Published: September 2019

Abstract
The article assesses the stress-strain state of the cylinder low-speed stage long-stroke piston unit are loading with an internal pressure of the working medium taking into account the temperature loads of its walls. The results of the analysis of the long-stroke piston unit low-speed stage cylinder are compressor unit show a significant effect of the temperature of the cylinder wall on their deformation. The analysis allows for optimal design of the piston unit low-speed stage cylinder stages under conditions of temperature loads, taking into account its actual deformed state.
Numerical simulation of gas exchange in two-stroke engine
Authors: Borisenko I V , Grishin Y A 
Published: September 2019

Abstract
In searching of new ways for increasing piston engine`s efficiency, power and torque and reducing emission, this article reveals non-traditional problem`s solving – using two-stroke piston with valves gas exchange mechanism instead of modern four-stroke piston engine for improving such characteristics as power-to-weight ratio, efficiency and fuel consumption with emission reducing. Numerical simulations were made in two different programs: Diesel-RK and AVL FIRE WorkFlow Manager. All the calculations validated to each other. This is not only numerical simulation of some new piston engine`s construction, but also working method of designing and improving piston engines with such constructions and type of working processes.
Numerical and experimental analysis of deformation and destruction of structurally heterogeneous joint assembly
Authors: Filippova Yu F , Doronin S V 
Published: September 2019

Abstract
This work is devoted to analysis of deformation and destruction of structurally heterogeneous joint assembly. The mathematical formulation of interacting parts of joint assembly is investigated. Logical and computational model of joint assembly presents various modes of its destruction and describes impairment conditions because of different damage states.
On the propagation of waves in dissipative layered cylindrical bodies
Authors: Marassulov A M , Sarsenov B T , Maulenov S S 
Published: September 2019

Abstract
In work questions of distribution of characteristic waves in the dissipative stratified cylindrical bodies interacting with deformable (viscoelastic) environments are considered. The dynamic behavior of cylindrical bodies is described by the equations of a mechanics of continua. The spectral task comes down to the solution of system of ordinary differential equations of first order with variable complex coefficients. The solution of system of differential equations is expressed by means of Bessel and Hankel’s cylindrical higher transcendental functions. The frequenciest equations are solved numerically by methods of Müller and Gauss. Change of a natural frequency and phase speed depending on a wave number is investigated. For dissipative heterogeneous mechanical systems nonmonotone dependence of imaginary parts of phase speeds on wave numbers is found.
Vibration and shock tests of magnetoactive elastomers
Authors: Ja Minaev A , Korovkin Ju V , Valiev H H 
Published: September 2019

Abstract
The results of the study magnetic elastomers samples on vibrating stands are presented. For the test materials amplitude-frequency characteristics were obtained. The shift of the resonant frequencies under the influence of external magnetic fields was determined. Based on the data obtained, a damper device is proposed that is controlled in an automatic mode. The characteristics of experimental oscillograms of impacts, which can be used to create shock-damping devices, are analyzed.
Optimization of the quality parameters of the transition process in hydraulic pressure regulators
Authors: Syrkin V V , Abramova I A , Galuza Yu F , Treyer V A 
Published: September 2019

Abstract
In direct-acting hydraulic regulators, the source of harmful self-oscillations of pressure in hydraulic systems may be their own damping of these regulators. Their elimination is possible by decreasing the valve gain coefficient according to the flow rate, which is determined by the magnitude of the fluid flow increment per unit of displacement of the regulator when the working fluid is throttled in the valve itself.
The article discusses the possibility of optimizing the quality parameters of transient processes in pressure regulators with the help of their integral evaluation using the example of optimization of the gain coefficient for the flow rate and the damping coefficient. It is established that the reduction of the gain is most appropriate for its large values. A further decrease in this ratio slightly improves the quality of the transition process, and may worsen the flow characteristic of the steady-state controller due to excessive displacement of the regulator. The tests confirmed the validity of this assessment of the quality of dynamic processes in the transient modes of these regulators.
On radicals and coordinate partial orders
Authors: Yu Nikitin A 
Published: September 2019

Abstract
The solution of equations and systems of equations over real, complex, rational and integer numbers is a classic topic of research in various areas of mathematics for several thousand years. In the last 20 years, the so-called universal algebraic geometry has been actively developed, in which systems of equations over arbitrary algebraic systems are researched. Many practically important problems on finite graphs, finite fields, and finite orders can be formulated as problems related to solving systems of equations over these systems, which leads to the need to develop algebraic geometry. Many modern models of informational defence represents by graphs and partial orders (posets). This article presents polynomial algorithms for constructing radical and coordinate partial order of systems of equations over finite partial orders in a language without constants.
Assessment of accuracy in calculations of network motif concentration by Rand ESU algorithm
Authors: Yudina M N 
Published: September 2019

Abstract
The article deals with the problem of calculating the frequency of network motifs with a help of Rand-ESU algorithm. We have established that while using a Rand-ESU algorithm, it is necessary to cut off (to thin out) the network motifs only on the last level of ESU-tree (and therefore, an implementation of the algorithm requires the construction of almost entire ESU-tree). Examples of calculations are given, they demonstrate, that other strategies to cut-off sampling lead to larger distance errors in calculation.
Intellectual training algorithm of expert system’s knowledge base at weakly structured problem area
Authors: Blagodatsky G A , Vologdin S V , Gorohov M M , Perevedencev D A 
Published: September 2019

Abstract
The development of a mathematical algorithm for the self-learning of the intellectual system (IS) for the management of science-intensive projects for the creation of complex technical objects is considered. IS training occurring by optimizing the knowledge base rules using machine learning methods. This will increase the effectiveness of decision support in the implementation of science-intensive projects and the adaptation of the recommendations of the IS on the request of the decision-maker. Based on the analysis and markup of the available data, as well as the formulated requirements for the algorithm, the algorithm of regression and classification (CART) trees is chosen because of its high speed and the possibilities of formalizing the obtained dependencies in the format of production rules. In accordance with the requirements set, the training parameters were determined and the efficiency of the algorithm for classifying scientific projects for a given number of classes and for formulating new dependencies of the knowledge base was checked. A general scheme for processing the user’s request with the described functionality of the intelligent module is presented.
Development of the automatic supervisory control system based on fuzzy inference
Authors: Denisova L A , Alekseytsev D M , Meshcheryakov V A 
Published: September 2019

Abstract
The development of the supervisory control system designed to ensure the automatic stabilization of the petroleum processing parameters in a multi-flow furnace is considered. The structure of the subsystem that generates the setpoints of the local flow controllers in order to optimize technological processes is proposed. The supervisory subsystem is designed to minimize two criteria of the controlled values. The genetic algorithm is used to tune the parameters of the fuzzy inference based supervisory subsystem. The description of the system implementation based on intelligent controllers is suggested as well as the results of system simulation in MATLAB.
The applied functional modeling of informative signals in informatively-analytical systems
Authors: Tsyganenko V N , Malkov O B , Belik A G 
Published: September 2019

Abstract
The relevance of subject consists in need to improve the reliability of analytical information at its use in control systems of different function. The aim of the work is to create the principles of modeling the primary informative signals used to determine applied complex analytical indicators, which allows solving the problems of forming the most effective control actions. For this purpose, the concept of applied functionality of quantitative information is introduced and a modeling system is proposed, which allows determining the estimates of continuous and discrete values at a given interval according to the criteria of maximum reliability of information presentation in information and analytical systems. The research on applied estimation of electric power on parameters of electric current is conducted. Thus, introduction of a semantic link between initial informative signals and resultant analytical indexes allows to increase their objectivity and reliability.
Classification and research of electro-technical devices with unclosed magnetic core
Authors: Andreeva E G , Gritsay A S 
Published: September 2019

Abstract
The article is describes the classification and study of the magnetic field and its power parameters for unclosed magnetic core electrotechnical devices. The ANSYS simulation software has been used. The features of structures based on an open-loop magnetic system (iron separators), an open magnetic system (concentrators), and a hybrid magnetic system are shown.The magnetic field patterns and force characteristics are obtained as a result of numerical calculations created on the finite element method (FEM) in the ANSOFT software. Results of experiment: the electrotechnical device with unclosed magnetic core allows due to its design and configuration, of the magnetic field, the use of concentrators with different attachments to improve the power parameters of the magnetic field, ponderomotive force and operational properties of these devices.
Improving the dynamics of a synchronous in-phase electric drive in transient modes of synchronization, phasing and control in response of reference signal changes
Authors: Bubnov A V , Chetverik A N , Chudinov A N , Shpineva V I 
Published: September 2019

Abstract
Synchronous in-phase electric drive is widely used in thermal-imaging and laser scanning systems due to their high accuracy and dynamic characteristics in a wide range of angular velocity control. The purpose of the article is to develop ways to control a synchronous-in-phase electric drive in the modes of synchronization, phasing and control in response of reference signal changes, allowing to improve the dynamic performance of the electric drive and reduce information loss in the scanning system. The method of electric drive phasing that is quasi-optimal in speed has been improved. Recommendations on the organization of transient processes with an abrupt change in the reference signal are formulated. For use in the electric drive control system, a circuit implementation of an impulse frequency-phase discriminator with an extended linear zone in the phase comparison mode has been proposed, it allows to improve the dynamic performance of the electric drive in the modes of synchronization, phasing and control in response of reference signal changes.