Model multiparameter distributions used in science and technology are analyzed and systematized. Particular attention is paid to the Rozin-Rammler-Weibull-Gnedenko and Kolmogorov-Gauss distributions, which adequately describe single and multiple crushing. The suitability of these distributions for modeling the granulometric composition of industrial waste from mechanical processing is confirmed by physical and computer experiments.

Keywords: distribution function, mathematical model, generalized hyperbolic distributions, crushing, bulk medium, mechanical processing

Samples of metal dust generated during milling of gray cast iron were collected experimentally. The machine operating mode, dust collection points, and blowing conditions were varied in the experiments. To ensure the reliability of the result, the physical stage of the analysis of the dimensional characteristics of the dust was performed using two methods: sieving and direct optical measurements. Significant discrepancies in the statistical parameters obtained by different methods were revealed. A hypothesis explaining the differences was proposed and confirmed. An integrated approach to the physical stage of dispersion analysis of bulk media is recommended.

Keywords: wood dust, parametric identification, sieve analysis, laser diffraction, micrographs, mathematical modeling, digital twin

Flight safety is one of the most important priorities of civil aviation. In recent years, there has been a downward trend in the number of aviation accidents, which is associated with the introduction of new technologies and training methods. One of these methods is computer simulator training (CTP).KTP is a training method in which LE specialists practice skills and procedures in a virtual environment that simulates real flight conditions. KTP allows you to increase the effectiveness of training, reduce the risk of errors and ensure that training meets modern safety requirements aviation simulators, development of simulator systems, simulators of aviation instrumentation.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

Models and a software package have been developed that allow for the analysis of counterparties for the probability of fulfilling government contracts. A comparative analysis of machine learning models has been conducted: logistic regression, decision forest, clustering, and neural network. A software package has been developed that allows for contract forecasting. A computational experiment has been conducted to analyze counterparties taking into account contracts that have been fulfilled or not completed by them. The best model has been established, demonstrating a forecast accuracy of 97.89% by the accuracy metric.

Keywords: mathematical modeling, cybersecurity, intelligent models, financial sector, government contracts, information infrastructure

Multilayer edge commutation in 3D integration technologies can simplify the design of microassemblies and reduce the length of edge electrical connections. However, this commutation is vulnerable to thermomechanical stresses and requires preliminary analysis of the product design. This paper shows the results of modeling various variants of multilayer edge commutation for 3D microassemblies, differing both in the dielectric material used at the edge redistribution layer and in the material for sealing the microassembly volume. It has been established that the lowest values ​​of thermomechanical stresses in commutation are characteristic of materials whose temperature coefficient of linear expansion is as close as possible to this parameter of conductors. At the same time, the use of composite dielectrics in redistribution layers leads to a more significant decrease in stresses than the use of more thermally stable unfilled polymers.

Keywords: 3D integration, packaging, thermomechanical stresses, polyimide, redistribution layer

In the article, the authors propose a methodology for managing connections in a community based on the developed heuristic algorithm for optimal seating of participants in a multi-round networking event to maximize the likelihood of new partnerships within offline events. The seating algorithm is based on solving the NP-complete problem of the maximum clique. Optimization of the resulting solution is implemented based on the permutation crossover algorithm.

Keywords: In the article, the authors propose a methodology for managing connections in a community based on the developed heuristic algorithm for optimal seating of participants in a multi-round networking event to maximize the likelihood of new partnerships withi

A comprehensive methodology for calculating assessment of wells reliability and condition in terms of submersible equipment operation, operating time and additional negative factors of operation through Boolean and fuzzy logic has been developed. The methodology includes retrospective analysis, calculation for the current moment and calculation of future possible failures with the preparation of various option of wells repair schedule and their distribution into risk zones.

Keywords: boolean logic, fuzzy logic, time to failure, bath function, weighting factor, membership function, screening method

The article examines the problem of power supply of low-power devices remote from stationary power sources. The structural solutions of autonomous power supply systems of high and low power, which use renewable energy sources, are considered. It is shown that in autonomous micro and low-power power supply systems, MPPT-type controllers do not provide technical and economic advantages compared to controllers in which, due to simple structural and circuit design solutions, the necessary but sufficient minimum of functions for charging and discharging the energy storage of the power supply system is implemented. The models of circuit solutions of the controller nodes are presented, which implement the necessary minimum of functions for charging and discharging the energy storage device and the results of experimental studies showing the operability of the proposed circuit solutions.

Keywords: power supply system, controller, renewable energy source, pulse voltage converter, battery, voltage limiter

The influence of the diffraction divergence of an acoustic beam on the characteristics of a single-channel acousto-optic correlator (AOC) is considered. A mathematical model is being developed to optimize the divergence of the acoustic beam of a single-channel acousto-optic correlator. It is shown that it boils down to amplitude and phase modulation of the pulse response of the device, and the nature of the parasitic modulation turns out to be invariant to the type of the correlator reference signal. As a result of numerical calculations, dependences were obtained that allow us to quantify the effect of diffraction divergence on the operation of the ACS. Methods of compensation for parasitic modulation are proposed, which makes it possible to improve the functionality of acousto-optic correlators.

Keywords: diffraction divergence of an acoustic beam, mathematical model of an acousto-optic correlator, ultrasonic light modulator, electroacoustic transducer, reference transparency

This study is devoted to the development of methods for the automatic assessment of the granulometric composition of ore after blasting based on data obtained from unmanned aerial vehicles (UAVs). Determining the size of ore fragments is an important step, since the effectiveness of subsequent crushing processes depends on its accuracy. Traditional methods of analysis use manual work, which requires considerable labor and is subject to subjective factors. The study examines modern machine learning methods and neural network architectures, such as Feature Pyramid Network (FPN), EfficientNet and SE ResNet, which can automatically and accurately segment images. As a result of the experiments, it was found that the VPN network with a pre-trained EfficientNet B2 base showed the highest IoU accuracy among the models.

Keywords: granulometric composition, FPN, Efficient Net, SEResNet

Abstract: This article is devoted to the formation of a methodology for determining the duration of emergency recovery work, in case of damage to buildings and their structures from the effects of force factors, which is an important industrial and social task. The main indicator adopted in this article for calculating the duration is the duration criterion (Upr). In the course of the study, factors were formed and grouped according to segmental characteristics, based on the degree of their influence on the duration of emergency recovery operations, a multiple regression equation was compiled, which allowed taking into account the influence of the most significant factors on a single assessment scale. The findings of the study are supposed to be used to determine the duration of emergency recovery work. Thus, the methodology for determining the duration of work is an important tool in the complex of measures for the effective conduct of restoration work and minimizing costs.

Keywords: emergency recovery work, organizational and technological model, method of expert assessments, multiple regression equation, capital construction project, technical condition of the building, force impact, ranking, duration of emergency recovery

This article discusses the use of secondary raw materials from industrial plants in the production of heavy concrete. This topic is very relevant nowadays, as the construction industry is expanding every year, and the need for concrete mixtures is increasing. Due to the increase in the production of concrete mixtures, the amount of natural raw materials used as a filler is reduced, therefore alternative raw materials are required to preserve natural reserves.

Keywords: construction, building material, industrial waste, secondary raw materials, environmental pollution, ecology, concrete mix, new technology

The paper presents the study of sound conductivity of a promising building material “Corrugated veneer”, the sequence of the study is presented, the installation for the study of sound conductivity is developed, the sound absorption and sound conductivity coefficients of the material “Corrugated veneer” are obtained.

Keywords: wood materials, finishing materials, building materials, board materials, veneer, laminated wood

The most important fields of 3d printing technologies. The patent's examples.

Keywords: 3d-printing, patents, civil engineering, industry, medicine

The article analyzes the placement of developed measuring devices for assessing the quality of blending of natural and chemical fibers in various spinning systems of cotton and wool spinning industry. The variants of installation of sensing elements on carding and draw frames are considered. Algorithms of interaction between microcontroller and personal computer in the automated measuring system are presented.

Keywords: automatic control systems, quality control of mixing in spinning systems, algorithms of interaction between microcontroller and personal computer

The construction industry is undergoing a significant shift toward technological advancement and 3D printing is one of the groundbreaking technologies leading the way. 3D printing technologies a widely protected by many patents, mainly in USA & China. Petrone's team are focusing on the integrity and performance of structures built using 3D-printed LEGO-like concrete modules.

Keywords: 3d - printing for Civil & Military Engineering, review of last year patents, 3D-printed LEGO-like concrete modules

The article discusses the developed software application for synchronizing the class schedule in the Modeus system with other systems and various devices. The experience of creating a service that integrates the class schedule into the calendar application, ensuring the relevance of data and its availability to users is described in detail. The features of interaction with the Modeus platform are analyzed, including disadvantages such as unstable access and the need for manual data entry. Mechanisms for optimizing the schedule update using the iCalendar format are proposed, which allows automating processes and reducing the likelihood of errors. The results of implementing the developed application, its impact on improving the convenience of the educational process for students and teachers are presented, and the prospects for scaling the application to other educational institutions are considered.

Keywords: curriculum, university, Modeus, SaaS, software agent, calendar, information board, iCalendar, BOOCO, educational process

The article considers the numerical solution of the dynamic problem of interaction of a a building with a foundation. The developed algorithm and computer program are implemented on the example of calculating a 9-story frame building taking into account the operation of bored piles from the impact in the from of a given earthquake accelerogram.

Keywords: numerical modeling, bedrock, accelerogram, spline approximation, bored piles, partial frequencies, integration step