Latest releases in the series
In recent years, interest in knowledge graphs (KG) has increased exponentially in both scientific and industrial communities. The KGs play an important role in the AI applications such as natural language processing including question-answering systems, recommender systems, and search engines…
knowledge graph, entity alignment, unmatchable entitiesThe system of automation of scientific research is considered in application to the problem of forecasting the development of the core transport network of Russia. Particular attention is paid to the visual and interactive presentation of modeling results. To support the simulation, stochastic…
transportation problem, modeling, research automation systemThe paper considers the problem of constructing the specialized versions of universal Cloud Sisal programs and presents an approach to solving it with the help of reducing concretizations. It describes a cross-platform Cloud Sisal compiler of the cloud parallel programming system (CPPS), which…
compiler, program concretization, internal representation, reducing transformation, programming system, Cloud Sisal language, annotated programmingThe paper is an attempt to systematize projects for the development of digital computing technology based on the science and technology policy adopted in the USSR. The socio-economic and technological imperatives that ensured the emergence of new computers, their production, element base and…
Electronic computing technology, science and technology policy of the USSR, catch-up development, computer generations, copying policy, Japanese challenge, Start VNTKThis paper addresses the critical task of entity linking for scientific terms in Russian texts to Wikipedia, a process vital for transforming unstructured text into structured knowledge. We introduce a novel algorithm and conduct a comparative analysis between RuBERT-tiny2 and spaCy, evaluating…
information extraction, entity linking, Wikipedia, scientific text processing, concept normalizationNew solutions to wave equations with variable coefficients describing traveling SH waves in a porous medium, taking energy dissipation into account, are obtained. These solutions are obtained using transformation methods, where equations with variable coefficients can be reduced to equations with…
This paper examines the use of neural networks to solve an inverse coefficient problem for a system of poroelastic equations. The problem consists of finding the desired functions of the system along with an unknown coefficient of the equation under an additional boundary condition. In this paper…
According to the data of the global and regional earthquake catalogs, the dynamics of the environment on the eve of strong (MS ≥ 6.2 for regions) and catastrophic (MS ≥ 8 for the whole world) earthquakes has been studied using the KCOR anomaly detection algorithm (the coefficient of paired…
catalogs of earthquakes, parameters of the seismogeodynamic process, tectonic conditions, strong earthquakes, creepexA one-dimensional inverse problem for a quasilinear hyperbolic system with an unknown excitation source is considered. The Cauchy problem for a nonlinear Hopf-type system is studied. The Fourier transform is used to reduce the inverse problem to a direct problem, and the existence and uniqueness…
two-velocity hydrodynamics, viscous fluid, relative velocity, direct problem, inverse problem, Darcy coefficientThis paper numerically studies the flow of magmatic melts in a horizontal channel under gravity. A difference approximation of the two-velocity hydrodynamic equations is performed using the control volume method. Non-uniform flows with different model parameter values and their influence on the flow…
Potential vorticity (PV) streamers and cutoffs are indicators to the Rossby wave breaking (RWB) near the extratropical tropopause. In the Rossby waves breaking, the formation of elongated high-PV stratospheric air tongues extending to the equator and tropospheric low PV air tongues extending to the…
potential vorticity streamers and cutoffs, Rossby wave breaking, climate modelingA numerical simulation of the water and sea ice dynamics of the Arctic Ocean was carried out to identify the physical mechanisms that determine the variability of the state of the ice cover. For the research, we used the coupled ocean-ice regional numerical model of the North Atlantic and the Arctic…
Arctic Ocean, sea ice, climate variability, numerical modelingThe Laptev Sea, one of the most severe Arctic shelf seas is the focus of the international research on account of a pronounced climate change (warming of the atmosphere temperature, lengthening of the summer open-water season, reduction of the ice extent, rapid coastal erosion). In recent years, as…
Arctic Ocean, Laptev Sea, climate variability, numerical modelingIn this paper, the adaptation of the SibCIOM three-dimensional thermodynamic model is considered that allows modeling a three-dimensional velocity and temperature distribution, as well as a two-dimensional field of the ice cover for the Novosibirsk reservoir with seasonal changes in the water level…
Novosibirsk reservoir, three-dimensional thermodynamic model, the local one-dimensional ice modelA hydrologically correct digital model of the bottom topography of the Lena River basin with a resolution of (1/3)° x (1/3)° is constructed. Based on the linear model of forming a water balance in the river-bed network and a model network of river channels schematized in the form of a graph of a…
hydrologically correct digital model, Lena River basin, linear formation model of water balance, channel network, surface runoff, river flow, dischargeIn the data assimilation algorithms for the air quality applications, the source identification problem can be considered as an auxiliary one for the solution of the model state function continuation problem. The algorithm based on the ensembles of the adjoint problem solutions is applied to solve…
source identification, inverse problem, continuation problem, adjoint equations, advection-diffusion-reactionThe satellite observations of smoke plumes from the pipes of power stations make possible to obtain prompt information about the processes of impurities distribution in the atmosphere and about the source parameters. This paper proposes a method of numerical reconstruction of characteristics of the…
satellite images, plume, buoyancy flow, atmosphere, hydrodynamics equations, impurities elevation heightConditional stability of explicit schemes in finite differences complicates the choice of a time step. The increase in the number of the grid nodes for more precise computations and the corresponding space step decrease leads to the increase in computer costs due to the decreasing of the time step…
The self-consistent evolution of the ion-acoustic collisionless shock with shock-reflected ions is numerically studied with kinetic simulations. We want to compare different approaches to the shock simulation based on the PIC-method. The results of one-dimensional fully kinetic simulation for both…
Today the method for the development of portable numerical simulation programs is very important because of the two main reasons. The first reason is the diversity of supercomputer architectures in Top500 and the second one is a demand for using the most powerful computers to simulate, for example…
portability, hybrid supercomputers, GPU, function variables, computational plasma physicsThe paper reviews the problem of forecasting the possible maximum pressure at the well-head, at the well-bore and at near-wellbore zone of reservoir during the process of new stimulation technology like reactive chemistry application. The technology provides stimulation by thermobaric effects. This…
This paper investigates a magma flow in permeable zones of the lithosphere. The model equations describing the dynamics of saturated porous media both without tangential stresses and with them are presented. The phenomenological method used for deriving the equations provides the thermodynamic…
This paper deals with an ill-posed problem to determine the size distribution for water drops in a cloud from a given scattering phase function. Numerical experiments have shown that a method based on non-negative least squares with additional requirements of smoothness can be used to solve the ill…
ill-posed problem, numerical method, scattering phase function, water drop clouds in the atmosphere, size distribution of water dropletsIn order to create systems of vibroseismic monitoring for earthquakeprone areas it is needed to carry out the simulation of seismic wave propagation in the media typical of volcanic structures. To this end it is required to develop supercomputer technologies for decreasing the computation time and…
elastic waves, 3D simulation, co-design, finite difference schemes, hybrid cluster, GPUNew parallel algorithm is developed for simulating the dynamics of a thin circumstellar disk. It is based on the combination of a gridless method of smoothed particle hydrodynamics (SPH) and the grid-based convolution method for calculating a gravitational potential. To develop the algorithm, we…