During this study, the resistivity of electrically conductive structures 3D-printed via fused filament fabrication (FFF) was investigated. Electrical resistivity characterisation was performed on various structural levels of the whole 3D-printed body, starting from the single traxel (3D-printed single track element), continuing with monolayer and multilayer formation, finalising with hybrid structures of a basic nonconductive polymer and an electrically conductive one. Two commercial conductive materials were studied: Proto-Pasta and Koltron G1. It was determined that the geometry and resistivity of a single traxel influenced the resistivity of all subsequent structural elements of the printed body and affected its electrical anisotropy. In addition, the results showed that thermal postprocessing (annealing) affected the resistivity of a standalone extruded fibre (extruded filament through a printer nozzle in freefall) and traxel. The effect of Joule heating and piezoresistive properties of hybrid structures with imprinted conductive elements made from Koltron G1 were investigated. Results revealed good thermal stability within 70 °C and considerable piezoresistive response with a gauge factor of 15–25 at both low 0.1% and medium 1.5% elongations, indicating the potential of such structures for use as a heat element and strain gauge sensor in applications involving stiff materials and low elongations.

An optimal decision support system under the decommissioning of nuclear facilities (a brief description of the structure is presented in the Bulletin of the National Research Nuclear University Moscow Engineering Physics Institute (NRNU MEPhI)) is presented. The main problem (choosing the best option for decommissioning nuclear facilities based on a multicriteria approach) is solved in the system. To solve the main problem under conditions of uncertainty, partial indicators are calculated using the Monte Carlo method for each option under the decommissioning of the nuclear facility. The cost and duration of decommissioning, as well as radiation exposure to personnel and the environment, are proposed to be taken as partial indicators. A histogram of the distribution of the complex indicator, which combines partial indicators according to their priority, is plotted using the calculated partial indicators for each decommissioning option. The best option for decommissioning the nuclear facility is chosen on the basis of the priority of the distribution histogram of the complex indicator for the best option in relation to other options under consideration.

The spectrometric characteristics of CdZnTe detectors are largely determined by the nonuniformity of the material and the influence of the negative polarization effects associated with the formation of space charges in the sensitive volume of the detector. They change the electric field distribution in the detector and affect the efficiency of the charge carrier collection. An analysis of the waveforms of the output pulses was used to investigate the uniformity of the charge collection and electric field distribution in the detectors when irradiated by the alpha particles. The influence of infrared (IR) illumination on these parameters was evaluated. IR illumination had no positive effect on the planar detector but greatly improved the charge collection in quasi-hemispherical detectors in the peripheral (corner) regions. The output pulse amplitude increased, and the rise time notably decreased. Polarization that occurred predominantly in the corner regions at low temperatures (from −30 °C to −20 °C) was eliminated using IR illumination.

This article discusses the possibilities and limitations of CdZnTe (CZT) quasi-hemispherical detectors operating over a wide temperature range and at high-gamma radiation fluxes. The results of the negative influence of low- and high-operating temperatures, as well as high-radiation fluxes on spectrometric characteristics of CZT detectors and possible ways to eliminate performance deterioration, are presented. The impact of infrared (IR) illumination parameters, such as wavelength and irradiation intensity on the spectroscopy performance of detectors, was investigated. A correctly chosen IR illumination wavelength and intensity were shown to significantly improve the energy resolution of CZT quasi-hemispherical detectors, allowing their stable operation in high-gamma radiation fluxes and extend the operating temperature range toward low temperatures. The influences of bias voltage values and temperatures on the quasi-hemispherical CZT detectors’ operating ability at high-gamma radiation fluxes were studied.

A problem of the Interpolation of multivariable function whose values are given at a finite number of points is considered in the paper. Problems of this kind arise when solving applied problems in various fields of research, including physics, engineering, economics, etc. We propose a new approach for solving this problem with the help of a metric analysis. The article gives a numerical example of the solution of the problem of the Interpolation of multivariable function for given values of a multivariable function, demonstrating the effectiveness of the proposed scheme.

Розроблено імітаційну модель розповсюдження теплоти у пластині безмежної дов-жини, що нагрівають під термічну обробку із застосуванням пакету прикладних програм«MatLab 6.5 SP1\7 + Simulink 5/6». Модель можна використовувати для оцінки розподілутемператури у фізично неоднорідних тілах різної конфігурації за умови можливості виді-лення ізотермічних шарів рівної товщини, а також наявності рівномірного теплообміну звідкритих поверхонь.

We showed earlier that, when aggregating network traffic measurements, starting from a certain aggregation window, a stable distribution is formed, which is approximated with a high accuracy by a lognormal law. Despite the fact that, in general, the results of network traffic measurements agree with this law, in the region of the small values of traffic intensity and transmission rate of network packets, there is a noticeable discrepancy between this law and the measurements. In this study, we discuss the problem of a peak arising in the low-intensity region during the aggregation of network traffic measurements. Taking into account the location of the peak in question, we called it the “zero channel” (ZC)

The problem of the reconstruction of a multivariable function whose values with chaotic errors are given at a finite number of points is considered in the paper. The problems of this kind arise when solving applied problems in various fields of research, including physics, engineering, economics, etc. We propose a new approach for solving this problem with the help of a metric analysis. The paper gives numerical two examples of the solution of the problem of the reconstruction of multivariable function, demonstrating the effectiveness of the proposed scheme. In the first example, the results of estimating the exact value of the function at the points where the values of the function with errors are known, in the second example, the results of reconstructing the physical characteristics of the core of a nuclear reactor are presented.

The results of a study of some ways to improve spectroscopy characteristics of the CdZnTe quasi-hemispherical detectors when working in high gamma radiation fluxes are presented. It was shown that the use of IR illumination with a wavelength of 1050 nm or 1200 nm or at slight warm-up of the detector to +30°C … +40°C can significantly improve spectroscopy performance of the CdZnTe detectors of size 3.5 mm × 3.5 mm × 1.75 mm when operating in a tested gamma-radiation field with a dose rate up to 590 mGy/h.

—The large amount of the DNA- and RNA-binding protein regulatory factors contain Zn-domains. Total six Zn-CysHis factor families with different functions were considered. Among them the transcription factors of family PF00096, complex type Zn-Cys2His2, is the most important because it includes over 340.000 members of 365.000 total members listed at present in the Zn-containing factor families. The role of electrostatic potential of Zn-domains in the structure and function of factors from different factor families has been considered. We have shown that the positive electrostatic potential of Zn-domains plays an essential role in forming contact of factors’ Zn-domains with DNA/RNA in three protein factor families PF00096, PF12874, and PF09329. While in other three families PF03119, PF08996, and PF01258 Zn-domains do not contact with nucleic acids, and electrostatic interactions do not play a distinctive role, consequently.

The article is dedicated to the current state of the Geometry Database for the BM@N experiment of the NICA project. The main goal of the database is to provide a central storage of the BM@N geometries, convenient tools for managing its geometry modules, various software assembling versions of the BM@N setup as a combination of modules and additional files providing support for a set of versions. Both the Graphical User Interface (GUI) and the Application Programming Interface (API) have been developed.

This paper is devoted to the development of mathematical models of exhaustion process of extracted mineral resources. Our new model combines the advantages of previous models and is devoid of their disadvantages. The model uses the transition of the growth rate of extraction of mineral resource to stationary value. The initial known parameters of the model include the explored residual volume of the mineral resource, the initial volume of its extraction, the initial growth rate of its extraction, and the indicator of decreasing rate of extraction growth. The model is applied using the example of predicted extraction and exhaustion of natural uranium.

A simple and efficient trigger for selecting the rare $${J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi } \to {{\mu }^{ + }}{{\mu }^{ - }}$$ events in the CBM experiment is proposed. The trigger fully relies on the signals from coordinate detectors of the MUCH muon system.

The current paper presents the possibility of heavy fragments identification using energy loss method and ωnk criterion in the STS detector of the CBM experiment.

The goal of this study is to answer the main question left unanswered by the authors of work [1]: which law do the statistical distributions of aggregated traffic measurements obey? It has been shown that the distributions that can be approximated with high accuracy by a lognormal or by a sum of two lognormal distributions, depending on the observation period, are formed when traffic measurements are aggregated.

The stability of choosing the decommissioning option for objects of atomic energy use (OAEU) is analyzed. An algorithm for studying changes in the factor values due to variations in the OAEU characterization parameters is described. Numerical examples are presented which implement the proposed schemes for calculating indicators, determining the most preferable options of OAEU decommissioning, and analyzing the stability of the decision of choosing the OAEU decommissioning option with possible factor values.

The last improvements and updates of the Geometry Database (Geometry DB) for the CBM (Compressed Baryonic Matter) experiment are described. The geometry DB is an information system that supports the CBM geometry. The main purpose of the Geometry DB is to provide a storage of the CBM geometry and convenient tools for managing geometry modules assembling various versions of the CBM setup as a combination of geometry modules and additional files. There must be functionality to support different versions of the CBM setup. The ability of setup versions is added. A set of corresponding tools, i.e. a graphical user interface (GUI) and an application programming interface (API), was implemented. Users do not always require regular updates of local CBMRoot from the version control system to solve their tasks (such as simulation or reconstruction). The main goal of the new functionality is to automatically select the setup version when loading the geometry corresponding to the current user environment.

The paper considers a problem of extrapolating functions of several variables. It is assumed that the values of the function of m variables at a finite number of points in some domain D of the m-dimensional space are given. It is required to restore the value of the function at points outside the domain D. The paper proposes a fundamentally new method for functions of several variables extrapolation. In the presented paper, the method of extrapolating a function of many variables developed by us uses the interpolation scheme of metric analysis. To solve the extrapolation problem, a scheme based on metric analysis methods is proposed. This scheme consists of two stages. In the first stage, using the metric analysis, the function is interpolated to the points of the domain D belonging to the segment of the straight line connecting the center of the domain D with the point M, in which it is necessary to restore the value of the function. In the second stage, based on the auto regression model and metric analysis, the function values are predicted along the above straight-line segment beyond the domain D up to the point M. The presented numerical example demonstrates the efficiency of the method under consideration.

The mouse factor Zif268, known also as early growth response protein EGR-1, is a classical representative for the Cys2His2 transcription factor family. It is required for binding the RNA polymerase with operator dsDNA to initialize the transcription process. We have shown that only in this family of total six Zn-finger protein families the Zn complex plays a significant role in the protein-DNA binding. Electrostatic feature of this complex in the binding of factor Zif268 from Mus musculus with operator DNA has been considered. The factor consists of three similar Zn-finger units which bind with triplets of coding DNA. Essential contacts of the factor with the DNA phosphates are formed by three conservative His residues, one in each finger. We describe here the results of calculations of the electrostatic potentials for the Zn-Cys2His2 complex, Zn-finger unit 1, and the whole transcription factor. The potential of Zif268 has a positive area on the factor surface, and it corresponds exactly to the binding sites of each of Zn-finger units. The main part of these areas is determined by conservative His residues, which form contacts with the DNA phosphate groups. Our result shows that the electrostatic positive potential of this histidine residue is enhanced due to the Zn complex. The other contacts of the Zn-finger with DNA are related to nucleotide bases, and they are responsible for the sequence-specific binding with DNA. This result may be extended to all other members of the Cys2His2 transcription factor family.