bluuebunny/crossref_metadata_2025_split huggingface dataset:
Redshift space power spectrum beyond Einstein-de Sitter kernels
Authors: Aviles Alejandro , Valogiannis Georgios , Rodriguez-Meza Mario A. , Cervantes-Cota Jorge L. , Li Baojiu , Bean Rachel 
Published: April 2021

Abstract
We develop a framework to compute the redshift space power spectrum (PS), with kernels beyond Einstein-de Sitter (EdS), that can be applied to a wide variety of generalized cosmologies. We build upon a formalism that was recently employed for standard cosmology in Chen, Vlah & White (2020), and utilize an expansion of the density-weighted velocity moment generating function that explicitly separates the magnitude of the k-modes and their angle to the line-of-sight direction dependencies. We compute the PS for matter and biased tracers to 1-loop Perturbation Theory (PT) and show that the expansion has a correct infrared and ultraviolet behavior, free of unwanted divergences. We also add Effective Field Theory (EFT) counterterms, necessary to account for small-scale contributions to PT, and employ an IR-resummation prescription to properly model the smearing of the BAO due to large scale bulk flows within Standard-PT. To demonstrate the applicability of our formalism, we apply it on the ΛCDM and the Hu-Sawicki f(R) models, and compare our numerical results against the elephant suite of N-body simulations, finding very good agreement up to k = 0.27 Mpc-1 h at z = 0.5 for the first three non-vanishing Legendre multipoles of the PS. To our knowledge, the model presented in this work is the most accurate theoretical EFT-PT for modified gravity to date, being the only one that accounts for beyond linear local biasing in redshift-space. Hence, we argue our RSD modeling is a promising tool to construct theoretical templates in order to test deviations from ΛCDM using real data obtained from the next stage of cosmological surveys such as DESI and LSST.
Synthetic Gravitational Waves from a Rolling Axion Monodromy
Authors: Özsoy Ogan 
Published: April 2021

Abstract
In string theory inspired models of axion-like fields, sub-leading non-perturbative effects, if sufficiently large, can introduce steep cliffs and gentle plateaus onto the underlying scalar potential. During inflation, the motion of a spectator axion σ on this potential becomes temporarily fast, leading to localized amplification of one helicity state of gauge fields. In this model, the tensor and scalar correlators sourced by the vector fields exhibit localized peak(s) in momentum space corresponding to the modes that exit the horizon while the roll of σ is fast. Thanks to the gravitational coupling of gauge fields with the visible sector and the localized nature of particle production, this model can generate observable gravitational waves (GWs) at CMB scales while satisfying the current limits on scalar perturbations. The resulting GW signal breaks parity and exhibit sizeable non-Gaussianity that can be probed by future CMB B-mode missions. Depending on the initial conditions and model parameters, the roll of the spectator axion can also generate an observably large GW signature at interferometer scales while respecting the bounds on the scalar fluctuations from primordial black hole limits. In our analysis, we carefully investigate bounds on the model parameters that arise through back-reaction and perturbativity considerations to show that these limits are satisfied by the implementations of the model that generate GW signals at CMB and sub-CMB scales.
Dependence of overlap topological charge density on Wilson mass parameter *
Authors: Cheng Zhen , Zhang Jian-bo 
Published: April 2021

Abstract
In this paper, we analyze the dependence of the topological charge density from the overlap operator on the Wilson mass parameter in the overlap kernel by the symmetric multi-probing source (SMP) method. We observe that non-trivial topological objects are removed as the Wilson mass is increased. A comparison of topological charge density calculated by the SMP method using the fermionic definition with that of the gluonic definition by the Wilson flow method is shown. A matching procedure for these two methods is used. We find that there is a best match for topological charge density between the gluonic definition with varied Wilson flow time and the fermionic definition with varied Wilson mass. By using the matching procedure, the proper flow time of Wilson flow in the calculation of topological charge density can be estimated. As the lattice spacing a decreases, the proper flow time also decreases, as expected.
Dynamics of a heavy-duty vehicle in a driving cycle
Authors: Domínguez-Pérez D N , Pantoja-Gallegos J L , Domínguez-Vergara N 
Published: April 2021

Abstract
The analysis of a heavy-duty vehicle moving in a driving cycle is presented. The different forces in the equation of motion are explained. In a driving cycle a target speed of the vehicle is prescribed as a function of time and then the revolutions per minute and the torque of the engine necessary to move the vehicle close to the prescribed speed are calculated. The driving cycle used in this paper is part of one of various cycles used by the Greenhouse Gas Emissions Model developed by the United States Environmental Protection Agency to certify the fuel consumption of heavy duty vehicles. The results using the software of that agency and one developed by the authors are reported for a vehicle with a 10-gear transmission, a 455 HP engine, three axes tractor and two axes trailer which have a total mass of 12742 kilograms and transport a load of 17236 kilograms.
Peculiarities of hazardous chemical fire in high-rise R&D buildings based on numerical simulation
Authors: Cao Yun , Zhang Mingguang , Cheng Qian , Zhang Shiqing 
Published: April 2021

Abstract
There are lots of chemical laboratories in high-rise R&D buildings. Large amounts of hazardous chemicals were stored in them. Once a fire breaks out in high-rise R&D buildings, its severity will be much greater than that of high-rise residential building fire. Inflammable chemicals, explosive chemicals, toxic chemicals are usually get involved in hazardous chemical fire. FDS software is usually used for numerical simulation of hazardous chemical fire. Then, the impact of hazardous chemicals fire in high-rise R&D buildings can be analyzed under different fire conditions. This paper collected the hazardous chemicals stocks of 69 companies in the R&D buildings and screened the storage data of hazardous chemicals. Typical hazardous chemicals were selected as fire simulation objects. The consequences of hazardous chemical fires can be analyzed by simulation results. The difference between hazardous chemical fire in R&D high-rise buildings and residential building fire can be found out. At the same time, relevant performance indexes will be proposed for the evacuation of high-rise R&D hazardous chemical fire.
Technological innovation, industrial upgrading and regional economic development: evidence from China’s Yangtze River Economic Belt
Authors: Wu Min , Jin Mengyun , Tian Yihao 
Published: April 2021

Abstract
The development strategy of the Yangtze River Economic Belt is an important strategy for China to cope with the new normal of economic development. This paper uses provincial panel data from the Information Network of the National Bureau of Statistics of China and the Development Research Centre of the State Council and conduct a panel data fixed effect regression model to empirically study the impact of technological innovation and industrial upgrading on economic development of 11 provinces in the Yangtze River economic belt. The results of full sample estimation show that technological innovation and industrial upgrading can promote economic growth at a significant level of 1%, but the impact of industrial upgrading is not obvious when they are considered separately. According to the results of sub-regional estimation, there is regional heterogeneity in the degree of effect of technological innovation and industrial upgrading on economy. Therefore, the Yangtze River Economic Belt should increase investment in science and technology, adjust industries according to the development orientation of provinces, pay more attention to the rationalization of industrial structure, rationally allocate resources among industries, and pay attention to the complementary development among regions.
Modeling and analysis of civil aircraft top level RNP system architecture
Authors: Wang Lei , Zhan Chao 
Published: April 2021

Abstract
In recent years, the international aviation organization has implemented new performance-based navigation technology and issued the operational requirements of required navigation performance (RNP). It involves the cross-linking of multiple complex systems, which puts forward higher requirements for aircraft development and management. In this paper, the development process of RNP functional architecture model is defined by using magic grid software. The modeling is completed from three aspects: problem domain, solution domain and implementation domain. The decomposition and implementation of complex functions are completed from top to bottom. This method can effectively solve the complexity problem of civil aircraft system, and lay the foundation for demand-based model forward design.
Analysis of Computer Graphic Image Design and Visual Communication Design
Authors: Bowen Peng , Hua Li 
Published: April 2021

Abstract
Firstly, this paper expounds the concepts of visual communication design and computer graphic image design, analyze the relationship between visual communication design and computer graphics design in detail, including the similarities and differences between them. Then, it analyzes the requirements of visual communication design and computer graphic image design, including design ideas, skills and concepts. Then, it elaborates the practical applications of computer graphic image design and visual communication design, including multimedia products, artistic creation and design, and commodity appearance design. Finally, it analyzes the combination of visual communication design and computer graphics image design. It is hoped that more people in the industry will pay attention to visual communication design and computer graphic image design, which will help promote the further development of computers.
To the theory of solvability of degenerate integro-differential equations in Banach spaces
Authors: Falaleev M V 
Published: April 2021

Abstract
The paper considers a new approach to constructing generalized solutions of degenerate integro-differential equations of convolution type in Banach spaces. The principal idea of the method proposed implies the refusal of the condition of existence of the full Jordan set for the Fredholm operator of the higher derivative with respect to the operator bundle formed by the rest of operator coefficients of the differential part and by the operator kernel of the integral component of the equation. The conditions are superimposed upon the values of the operator function specially constructed on the basis elements of the Fredholm operator kernel. Under such an approach, the differential part of the equation may include not only the higher derivative but also any combination of lower derivatives, what allows one to consider the convolution integral-differential equations from universal positions, without any special account of the structure of the operator bundle. The method proposed represents a form of generalization of the technique based on the application of Jordan sets of Fredholm operators, and, in the case of existence of the latter, the method coincides with this technique. A generalized solution is constructed in the form of a convolution of the fundamental operator function, which corresponds to the equation under investigation, and the function, which includes both the right-hand side of the equation and the initial data. The conditions, under which such a generalized solution does not contain any singular component, and the regular component converts the initial equation into an identity and satisfies the initial data will provide for the resolvability of the initial problem in the class of functions characterized by the respective smoothness. In this case, the generalized solution constructed will be classical. The theorem on the form of fundamental operator function has been proved. The abstract results have been illustrated via examples of initial-boundary value problems of applied character (from the theory electromagnetic fields, the theory of oscillations in visco-elastic media, the theory of vibrations of thermal-elastic plates).
On an exact solution to the nonlinear heat equation with a source
Authors: Kazakov A L , Lempert A A , Spevak L F 
Published: April 2021

Abstract
The paper is devoted to the study of a singular nonlinear second-order parabolic equation, which is called the porous medium equation or the nonlinear heat equation. One of the important classes of its solutions is heat waves propagating over a zero background with a finite velocity. This property is not typical for parabolic equations and is a consequence of singularity. The main object of study is exact solutions of mentioned type. A new way of separating variables is used to represent them. We obtain conditions when it is possible to make a reduction to the Cauchy problem for an ordinary second-order differential equation with a singularity. It is shown that the Cauchy problem describes a heat wave whose front moves exponentially. We construct a solution to the Cauchy problem as a power series and determine the cases when the series breaks off, i.e. the solution has the form of a polynomial, and the corresponding heat wave can be written explicitly. If the Cauchy problem cannot be explicitly integrated, the solution is constructed numerically. An algorithm based on the boundary element method is proposed. We perform a computational experiment and conclude the properties of the found solutions. Besides, the accuracy of the calculation results is analyzed.
Distributed model of space exploration by two types of interacting robots and its exact solutions
Authors: Kosov A , Semenov E 
Published: April 2021

Abstract
A system of nonlinear parabolic differential equations is being studied, considered as a distributed mathematical model of the process of examining three-dimensional space by interacting robots of two types. Parametric families of exact solutions have been built that can be used to form the control of the survey process by creating the necessary densities at the border of the area that is the base for robots.
An equilibrium position in the generalized mathematical model of a system of rigid bodies elastically mounted on an Euler-Bernoulli beam
Authors: Mizhidon A 
Published: April 2021

Abstract
The paper considers a generalized mathematical model of a class of mechanical systems, which represent systems of rigid bodies elastically mounted on an Euler-Bernoulli beam. This model has the form of a hybrid system of differential equations having a definite structure and describing the process of transfer (transition) of the system within the frames of some coordinated system chosen. On the basis of the generalized mathematical model, a generalized approach to finding the equilibrium position for mechanical systems, which belong to a given class of systems, in a chosen coordinate system has been proposed. The equilibrium position of a mechanical system is understood as the solution of a definite hybrid system of differential equations, furthermore, this solution does not change with time. The equilibrium position of a mechanical system within a given coordinate system allows one to proceed - by replacement of the variables - to consideration of the generalized mathematical model studied earlier and describing transfer of a system with respect to the equilibrium.
Dynamical control on the homotopy analysis method for solving nonlinear shallow water wave equation
Authors: Noeiaghdam L , Noeiaghdam S , Sidorov D 
Published: April 2021

Abstract
In this paper, the nonlinear shallow water wave equation is illustrated. The famous semi-analytical method, homotopy analysis method (HAM) is applied for solving this equation. The main novelty, of this study is to validate the numerical results using the stochastic arithmetic, the CESTAC method and the CADNA library. Based on this method, we can find the optimal iteration of the HAM, optimal approximation of the shallow water wave equation and optimal error. The main theorem of the CESTAC method is proved. Based on this theorem, we can show that the number of common significant digits for two successive approximations are almost equal to the number of common significant digits for exact and approximate solutions. Thus instead of traditional absolute error to show the accuracy of method we can apply the new termination criterion depends on two successive approximations. In order to find the convergence region of the HAM, several ħ-curves are demonstrated.
First and second order necessary optimality conditions for stochastic distributed systems
Authors: Mansimov K B , Mastaliyev R O 
Published: April 2021

Abstract
An optimal control problem of stochastic system, which that dynamics is described by hyperbolic type stochastic partial differential equations with a multipoint type quality criterion, is considered. A stochastic analog of the Euler equation is obtained and singular controls in the classical sense are investigated.
An optimal control problem by a first-order hyperbolic system with delay and integral control constraints
Authors: Poplevko V P , Arguchintsev A V 
Published: April 2021

Abstract
A non-classic optimality condition and numerical algorithm for smooth boundary control in semi-linear first-order hyperbolic system with delay are presented. An additional integral control constraint is considered. The suggested approach is based on special variations of admissible continuously differentiable controls. These variations lead to a necessary optimality condition which is a base for a numerical method. An illustrative example demonstrates the effectiveness of the proposed approach.
Numerical study of the optimal control problem for one model of potential distribution in a crystalline semiconductor with the Showalter–Sidorov condition
Authors: Vasiuchkova K V 
Published: April 2021

Abstract
The paper considers a mathematical model of potentials optimal distribution in a crystalline semiconductor. This model is based on the problem of optimal control of weak generalized solutions of the mathematical model of the potential distribution in a crystalline semiconductor with the Showalter–Sidorov condition. The theoretical results obtained by us earlier made it possible to develop an algorithm for a numerical method for finding an approximate one by solutions of the optimal control problem for the problem under study, based on the methods of decomposition, Ritz, penalty and Galerkin’s projection method. The results of a computational experiment are presented.
The formalization of building software system user segments using relational interactive logic
Authors: Naumov D A , Zakharov D V 
Published: April 2021

Abstract
This paper proposes an approach to formalizing the process of constructing segments of software system users by relational interactive logic. The segment description is specified as a system of logical equations and inequalities. The role of variables in such a system is played by relational terms, each of which represents some qualitative or quantitative characteristic of the user. To automatize this approach, a software solution architecture diagram is proposed, which provides the construction and interpretation of a system of logical equations.
A model of new information dissemination in the society: important area in the parameter space
Authors: Timofeev S V , Baenkhaeva A V 
Published: April 2021

Abstract
A basic mathematical model of new information dissemination in the society is constructed and studied in some of the important cases. The suggested model has been described using the system of four ordinary differential equations with quadratic nonlinearity in the right parts. Two stationary solutions which provide a quite logical interpretation for this system were found. The important area with interesting properties of stationary solutions was separated in the parameters’ space of the system. The global properties of a phase portrait of the constructed dynamic system were investigated by qualitative methods of the differential equations theory. The obtained results allowed to find one of possible scenarios of new information dissemination in the society.
Uncertainty and certainty relations for quantum coherence with respect to design-structured POVMs
Authors: Rastegin A E 
Published: April 2021

Abstract
The concept of quantum coherence and its possible use as a resource are currently the subject of active research. Uncertainty and complementarity relations for quantum coherence allow one to study its changes with respect to other characteristics of the process of interest. Protocols of quantum information processing often use measurements that have a special inner structure. Quantum designs are considered as tools with a perspective of fruitful applications in quantum information processing. We obtain uncertainty and certainty relations for coherence averaged with respect to a set of design-structured POVMs of rank one. To characterize the degree of coherence, the relative entropy of coherence is utilized. The derived relations are exemplified with quantum designs in the two-dimensional Hilbert space.
Simulation of the Tunka-Grande, TAIGA-Muon and TAIGA-HiSCORE arrays for a search of astrophysical gamma quanta with energy above 100 TeV
Authors: Ternovoy M , Kotovschikov I , Budnev N , Chiavassa A , Dyachok A , Gafarov A , Garmash A , Grebenyuk V , Gress O , Gress T , Grishin O , Grinyuk A , Horns D , Ivanova A , Kalmykov N , Kindin V , Kiryuhin S , Kokoulin R , Kompaniets K , Korosteleva E , Kozhin V , Kravchenko E , Krykov A , Kuzmichev L , Lagutin A , Lemeshev Y , Lubsandorzhiev B , Lubsandorzhiev N , Mirgazov R , Mirzoyan R , Monkhoev R , Osipova E , Pakhorukov A , Pan A , Panasyuk M , Pankov L , Petrukhin A , Poleschuk V , Popova E , Porelli A , Postnikov E , Prosin V , Ptuskin V , Pushnin A , Raikin R , Rubtsov G , Rybov E , Sagan Y , Samoliga V , Silaev A , Silaev Jr A , Sidorenkov A , Skurikhin A , Slunecka C , Sokolov A , Suvorkin Y , Sveshnikova L , Tabolenko V , Tanaev A , Tarashansky B , Tkachev L , Tluczykont M , Togoo R , Ushakov N , Vaidyanathan A , Volchugov P , Voronin D , Wischnevski R , Zagorodnikov A , Zhurov D , Yashin I 
Published: April 2021

Abstract
In the paper we present our simulation strategy of the Tunka-Grande, TAIGA-Muon, and TAIGA-HiSCORE arrays in the light of the problem of separation astrophysical high-energy gamma rays from the cosmic ray background. The paper contains a description of our simulation method, based on Geant4 and CORSIKA codes. We also present the prospect of future research with TAIGA (Tunka Advanced Instrument for cosmic rays and Gamma Astronomy) with using the simulation results.