bluuebunny/crossref_metadata_2025 huggingface dataset:
Safety Level Analysis of Waterway Traffic Based on Trend Test in the Yangtze River
Authors: Wang Guobo , Hu Yahan , Hu Yuchang
Published: February 2021

In order to improve the safety of waterway traffic in the Yangtze River, comprehensively integrate the current status of waterway traffic safety at home and abroad. Analogy and MK trend analysis methods are used to analyze the current status and development trend of safety level of waterway traffic in the Yangtze River. The results show that there are significant differences in F-N indicators for waterway traffic safety in different countries. The U.S. has an outstanding ability to respond quickly to accidents, and can maintain a low level of F-N indicators even with a large number of accidents. The safety level of waterway traffic in the Yangtze River is relatively low. In particular, there is still a big gap of the rescue capability between China and developed countries. The safety level of water traffic on the Yangtze River is constantly improving, and the changing trend of waterway traffic safety level shows a more significant growth.
Compare between rotational and translational seismic response spectra
Authors: Liu YueWei , Zheng JingYun , Wu Zhitang
Published: February 2021

Rotational response spectra are still absent due to the substantial lack of direct measurements of rotational seismic waves. The work develops a relationship between rotational response spectra and translational ones. By the elastic wave theory, seismic rotations can be calculated form translational waves. In this paper, 113 translational waves are used to calculating rotational waves. And then the translational response spectra and rotational response spectra are calculated and compared. Factors such as the site condition and frequency are considered. The results show that from lower frequency to higher frequency, the ratio of normalized response spectra between rotational and translational waves increases. The ratios are also related to the site condition.
Analysis and Prediction of Subway Settlement Deformation Based on Grey Model
Authors: Shufen Zheng , Jing Wen
Published: February 2021

In this paper, the monitoring data of settlement and deformation along the western section of a metro in H city are collated and analyzed, the actual situation of settlement and deformation is grasped, and the long-term settlement and deformation trend are predicted by using grey prediction model. In the process of forecasting, a non-equidistant grey forecasting model is established by using the data of the first several groups of monitoring points, and the predicted values are compared with the last group of monitoring data to verify the reliability of the model and further optimize the model. Then, the optimized model is used to predict the long-term settlement deformation of the subway, which provides a basis for the deformation control and management of the subway.
Study on blasting vibration characteristics of metro tunnel based on wavelet packet technology
Authors: Jiang Shibin , Zhao Chen , Gao Shang , Ji Xinyu , Lv Xianpeng , Sun Hao , Chen Jihui
Published: February 2021

Wavelet packet technology has been widely applied in the study on blasting vibration transmission law of overlapping tunnels. The previous research focused on vibration transmission law of the distant area---a range more than 20m, but for the close area---a range less than 10m, research seldom has been carried out. Therefore, this paper, based on a overlapping tunnel project in Qingdao, reveals the blasting vibration transmission law of the close field as well as how the numbers of free surfaces affect the law. Firstly, at the site,the blasting vibration data both in front and rear of the working faces including the cutting area (a free face) and the spreading area (two free faces) in a newly-built tunnel are obtained; Secondly, the wavelet packet technology is applied to analyze the data of blasting vibration frequency and energy distribution characteristics. Finally, it is concluded that different free facing with different numbers can lead to different main frequency distribution range and different law of main frequency band changing with distance when blasting vibration transmit within the close field; and the vibration signal energy in front and rear of the working face in cutting area and spreading area is differently distributed in the directions of 3 channels. Combining blasting vibration signal frequence with energy factors, this paper puts forward the constructive suggestions on the safety protection of existing tunnels and provides reference for studying the law of blasting vibration transmission of overlapping tunnels.

CLC classification number: 0389 TD235 Document identification code: A
Field test on engineering characteristics of karst breccia
Authors: Yin Xiansong , Xie Liming , Feng Mingquan , Wang Song
Published: February 2021

Karst breccia is a special kind of rock related to karst action with wide distribution. The karst breccia in the dam site area of a hydropower station in the Three Gorges reservoir is very representative. Field tests are carried out on the karst breccia at the dam site of the hydropower station, including in-situ deformation test, direct shear test, triaxial compressive test, large density test and particle analysis test. The test results show that the engineering characteristics of karst breccia in the dam site area is close to that of soil, and moisture content, gravel content and lateral pressure are important factors affecting deformation modulus. Water content has a weakening effect on the mechanical properties of karst breccia, and the higher the water content is, the lower the deformation modulus of the same kind of lithology is. The shear strength parameters of karst breccia determined by triaxial compression test are higher than that of the direct shear test.
Dynamic Effect of Rudder Rotary Response on Ship Manoeuvrability
Authors: Xi Chen , Yongshun Wu , Zhi Pan , Sujun Yang , Fei Wang
Published: February 2021

Simulation mathematical model of maneuverability such as zig-zag and turning circle test under different rudder and speed is built and the rudder rotary response effect on ship maneuverability parameters is analyzed extensively. In the paper, MMG (maneuvering model group) model is adopted to set up the 3 degrees of freedom governing equations of ships, in which the rudder rotary response is approximated by the assumption of uniform rotary speed. A sea-going vessel of 10 thousand deadweight tonnages is selected as the numerical simulation target to investigate the rudder rotary response effect on ship maneuverability parameters, such as the zig-zag and turning circle test. Some meaningful conclusions are concluded through comparative analysis, the conclusions indicate that rudder rotary response has remarkable effect on ship maneuverability, and it is a significant factor which needs to be taken into consideration for actual ships.
The development and application of BIM and virtual reality technology in the field of architectural design in the information age
Authors: Wang Xianhe
Published: February 2021

With the continuous development of modern information systems and computer network technology, digital building technology and virtual reality technology have emerged. In the field of architectural design, BIM technology and virtual reality technology have changed the traditional architectural design methods. They can effectively improve the efficiency of architectural design and the overall effect of architectural design. The article aims to provide a reference for the sustainable development of my country’s architectural design through the elaboration of the status quo of the development of digital building technology and virtual reality technology in the field of architectural design, the analysis of its advantages in the field of architecture, and the discussion of its application in the field of architectural design.
Elaboration of the initial requirements in the design activities
Authors: Slătineanu L , Oroian B , Condrea I , Botezatu C , Hrițuc A , Boca M A , Coteață M , Dodun O
Published: February 2021

In solving the design problems, the initial requirements’ clear statement significantly affects the design process’s final result. Right from when the design problems are identified, the main requirements must be defined so that the final product meets the designed equipment requirements. Designers noted that design requirements do not have equal significance, and different solutions have been proposed to consider their weight in terms of end-use properties. The weighting can be achieved by simpler and operative methods and by more detailed methods of analysis. The paper approaches the problem of using the double input matrix method for weighting the functional requirements when discussing the problem of designing equipment to investigate the behavior of a computer component when the environment temperature is different compared to the normal temperature. The functional requirements assessment could provide an overview of the financial resources that could be invested in components to adequately meet the functional requirements. A first version of the tracked equipment was designed so that the previously established functional requirements are met.
FEM analysis of stress-strain state and material consumption of RHS with longitudinal gap and weld during the tests
Authors: Kukhar V V , Sahirov Y G , Hornostai V M , Markov O E , Nahnibeda M M
Published: February 2021

The paper implements a method for analyzing the stress-strain state of rectangular hollow sections (RHS) by finite-element modeling (FEM) of tests for three-point bending and torsion. Design schemes, 3-D solid-state and deformable models have been developed using the automated analysis and CAD/CAE system software, made it possible to obtain equivalent stress distributions and displacements in models. A simulation of tests for RHS with a cross section of 40 mm × 50 mm, manufactured in two ways, was carried out: (a) by direct-forming of galvanized steel strips on roll-forming mill in a semi-closed section with a longitudinal gap of 0.5 mm between the edges formed on a 40 mm web (DF-RHS); (b) similar direct-forming to the closed section and next welding the edges to a longitudinal weld along the web middle of 50 mm (DFW-RHS). RHS with various wall thicknesses (t = 1.93 mm, 1.84 mm and 0.7 mm) was investigated, given the design features that depend on the manufacturing processes of structural sections. It was found DFW-RHS is stiffer by at least 50% compared to DF-RHS, which allows to savings the metal by reducing the RHS wall thickness by 62% while maintaining the same stiffness and ensuring high strength of structural section.
Analyze of shape memory wires behavior under external solicitation using finite elements analysis (FEA)
Authors: Burlacu L , Dănilă C , Birnoveanu T I , Cimpoeșu N , Bujoreanu LG
Published: February 2021

Nitinol shape memory alloys present many applications in the industrial areas based on exceptional memory effect properties. The behavior of a shape memory alloy (superelastic effect) underwire form (four diameters: 1, 1.5, 2 and 2.5 mm and three lengths: 75, 150 and 375 mm) at drawing was analyzed using finite element analysis (FEA). The wire shape was C letter. The experimental temperature test, in a first step, was 23 °C (room temperature) and we analyze the appliance of four solicitation forces in order to determine the specific deformations and tensions. In second simulation step we apply a higher temperature, respectivelly 80 °C, in order to analyze the behavior of the element through transformation phase from martensite to austenite. The simulation provides information on the total deformation, equivalent stress, and equivalent elastic deformation of the intelligent elements under external solicitations pointing the appearance of maximum and minimum solicitation areas.
Researches on the recovery of useful metals from spent Li-Ion batteries
Authors: Bratosin I , Ghica V G , Petrescu M I , Buzatu M , Iacob G , Necşulescu A D
Published: February 2021

The present and future importance of Li-Ion batteries is immeasurable; this is evidenced by the awarding of the Nobel Prize in chemistry in 2019, to the team of John Goodenough - director, M Stanley Whittingham and Akita Yashino, who developed the technology to make this type of rechargeable battery. Used at the beginning (1990-2000) in applications such as portable electronic equipments (mobile phones, laptops, electric tools, energy storage systems, etc.), these batteries are considered the most suitable battery for powering electric vehicles. Today the number of electric cars in the world has exceeded 4 million units and the future estimates are among the most optimistic. Recycling of Li-Ion batteries is mainly done in China and South Korea, countries that have a large share in their production, but things can change. Intense research for the recovery and reuse of useful metals contained in these batteries is carried out in many research laboratories. The paper presents the current state of the research undertaken for the recovery of the cathodic paste with high content of Cobalt of waste LIBs, by ultrasonography in lactic acid solution. The hydrometallurgical method uses a non-polluting organic (lactic) acid. The working technique, the results obtained and the investigations carried out on the recovered materials are presented (analysis of optical and electron microscopy, EDX, X-ray diffraction). The paper also includes data regarding the optimization of the separation process of the active cathode paste from the aluminium foil using the orthogonal central-compositional programming of the second order.
Optimization Algorithms for Energy Building Applications
Authors: Tsala S , Koronaki I P
Published: February 2021

The creation of the structured environment affects the environment in all three phases of the construction and the demolition of buildings. The appropriate design of buildings requires full identification of the interaction between the environment and the structured environment. Energy efficiency is a mandatory requirement and integral part of green and sustainable buildings. Energy efficient design optimization is both a design philosophy and a practical technique which has been proposed and used by architects and other professionals for several decades, especially in recent years. Bioclimatic construction has been an important tool for improving the construction of buildings in the past few decades. Energy-saving options in buildings include the use of appropriate materials, exposures and the use of alternative power generation systems. In the present work, the methods and tools used for building design optimization are displayed in an effort to explore the reasoning behind their selection, to present their abilities and performance issues, and to identify the key characteristics of their future versions. In this essay, several algorithms are provided for optimizing problems which are proposed for building construction. Depending on whether limitations are given and on the general form of the optimization problem, one could choose the optimization algorithm which suits each case.
Waste energy recovery simplify assessment
Authors: Knapčíková L , Hricová R , Pandová I , Pitel’ J
Published: February 2021

The paper deals with research on the energy recovery of municipal solid waste and the related impact of the recovery on the environment. Through research steps, analyses of the current production of waste, its energy recovery and the impact on the environment were gradually performed in the Prešov self-governing region in Slovakia. A simplified comparison was made between the impacts of the current landfill method and the proposed incineration method. In terms of forecasts for the development of municipal solid waste produced in the coming period, scenarios of solid municipal waste treatment possible alternatives for the future period are outlined by the help of the electronic monitoring platform.
The wastewater using in technologies of bio-oil production from microalgae: CO2 capture and storage
Authors: Chernova N I , Kiseleva S V
Published: February 2021

Bioenergy remains the largest renewable energy industry. At the same time, microalgae (MA) are a promising object of research among other types of biomass and the scale of microalgae using for energy purposes is increasing. Industrial cultivation of microalgae opens up great opportunities for CO2 utilization and wastewater treatment from organic and mineral pollutants, and also significantly reduces the load on fresh water supplies. To reduce the cost of biofuels, optimization of a whole number of technological stages, including the cultivation of MA, is necessary. The paper presents the results of developing methods for cultivating MA to optimize their growth and absorption of nutrients from wastewater. A culture of microalgae/cyanobacteria Arthrospira platensis rsemsu P (Bios) (collection of RSE Laboratory at Lomonosov MSU) which grew well in wastewater was experimentally selected. The results of the wet MA biomass conversion into bio-oil by hydrothermal liquefaction (HTL) technology with the associated production of biochar are presented. Biochar producing can be considered as a method for capturing and storing carbon.
The influence of the hybridization factor on vehicle energetic consumption for different e-gearbox configurations
Authors: Rențea C , Bățăuș M , Maican S , Oprean M , Frățilă G
Published: February 2021

To reduce the CO2 emission level for the new CAFE regulations, it is mandatory that automobile producers should choose the hybridization approach.

Relevant published literature show that for a mild hybrid passenger car, increased values of the hybridization factor (HF) have marginal influence over the fuel economy for high speed values if a fixed ratio e-gearbox is used. This paper analyzes the energetic consumption for a Through the Road Hybrid Vehicle (TTR-HEV) when using a two-gear ratio transmission for the electric axle.

To investigate the energetic performances, a complex model developed in a performant simulation environment is used. The energetic consumption is determined for five different test cycles in terms of speed and duration by analyzing the fuel consumption ratio (FCR) for different values of the HF.

In order to compare the test cycles, the FCR parameter is used, after which the correlation with vehicle speed fluctuation (VSF) is explored.

The simulation results obtained for the current application are compared with a hybrid vehicle equipped with a single gear in the rear axle. The results are also expressed in terms of CO2 emission.
The use of the genetic algorithms for optimizing public transport schedules in congested urban areas
Authors: Șerban A.
Published: February 2021

Transit operators face with travel time variability issues related to the design of new transit lines or related to the improvement of the performances of existing lines, especially when transit vehicles without exclusive line. Nowadays, the availability of large data through automated monitoring allows more in-depth this phenomenon of variability in timetables to be pointed out with recorded data. The lack of schedule stability confuses the traveling public and thus the degree of dissatisfaction increases. This leads to a decrease of the public transportation users, especially because of those users having travel alternatives to public transportation. The reliability of the travel time and the vehicle operation according to a stable timetable are the most relevant attributes for the users fidelisation. At the same time, it is well known that the demand for public transportation in congested networks has a large variability over space and time. In this paper, we analyse the deviations from the planned (declared and publicly) schedule for a tram line in Bucharest city in different stations, in diferrent times of the day and in different days of the week, in order to build an optimisation model for needed adjustments to the planned schedule. The data are collected with the Automatic Vehicle Location (AVL) system installed on trams’ board. The number of the adjustments solutions is very large and the genetic algorithm is engaged for the optimisation model solving.
Overview of the III International Conference on Advanced Technologies in Aerospace, Mechanical and Automation Engineering – MIST: Aerospace-III-2020
Authors: Kovalev Igor V , Testoyedov Nikolay A , Voroshilova Anna A
Published: February 2021

The overview describes the main directions and results of the III International Conference on Advanced Technologies in Aerospace, Mechanical and Automation Engineering - MIST: Aerospace-III-2020 held in Krasnoyarsk in November 20-21, 2020. It gives the details about the participants and the proceedings.
Forming a tubular ridge by pulsed-magnetic field pressure
Authors: Kurlaev N V , Matveev K A , Tagoev F M , Ahmed Soliman M E
Published: February 2021

When creating samples of new technology corresponding to the current level of development of mechanical engineering, ever higher requirements are imposed on the accuracy and quality of parts and assemblies, including thin-walled tubular parts of aircraft. To ensure such accuracy, this work proposes a magnetic pulse stamping process. In particular, for the formation of a tubular ridge, the technological process of forming in addition to calibration by a magnetic pulse field is proposed. To study the stress-strain state of the workpiece and the tool, the finite element method was applied using the ANSYS program. The calculation results were summarized in the form of a nomogram to determine the required technological modes, taking into account the material properties and the pressure amplitude of the pulsed magnetic field. The data obtained as a result of numerical simulation create the basis for identifying and subsequent accounting for the technological heredity of the material.
Model of a turbulent flow of a two-phase liquid with an uneven distributed phase concentration in a horizontal pipe
Authors: Ilhamov Kh Sh , Narzullaev D Z , Ilyasov Sh T , Abdurakhmanov B A , Shadmanov K K
Published: February 2021

We study the turbulent stationary motion of a mixture in a horizontal cylindrical pipe, taking into account the formation of a concentration field of the second dispersed phase that is not uniform over the cross section, and estimate the transporting ability of the flow. The article has developed a model for the movement of a two-phase mixture in a horizontal cylindrical pipe, taking into account the uneven distribution of the concentration of the second phase over the flow … Also, in this model of mixture motion, the coefficient of the force of interaction between the phases is determined depending on the concentration distribution. The problem is solved by a numerical method. Investigating the numerical results of the problem, the nature of the formation of the velocity field at various values of the flow saturation with solid particles is revealed and makes it possible to assess the account of the size of these particles, taking into account the turbulence of the flow. The implementation of the developed mathematical models and recommendations will make it possible to predict the transporting ability of a two-phase flow in pressure systems, and helps to find solutions with spatial hydrotransport and irrigation and drainage systems.
Influence of tightening fitting accuracy for resource connection
Authors: Leonov O A , Shkaruba N Zh
Published: February 2021

A dependence have obtained for determining the design tolerance of fit, as one of the characteristics of the model of parametric failure of a joint with an interference fit, the calculation is carried out taking into account the wear rate and the parameters of its dispersion at a certain resource and a given probability of failure-free operation. On the example of calculating a connection with an interference fit, it have shown that the choice of a fit without a margin of accuracy cannot ensure the operational reliability of the connection, but only guarantees the absence of failures at the initial stage of work – during the warranty period. It have proven that with the right choice of fit accuracy, it is possible to achieve a significant increase in the resource of failure-free operation.
Method of precision dimensional analysis in modelling of technological processes for shafts manufacturing
Authors: Khalimonenko A D , Pompeev K P , Timofeev D Yu
Published: February 2021

In this paper, we propose a method for conducting a dimensional - precision analysis of technological processes of making shafts using bench centers and consider the features of its application. A method for drawing up rotation error diagrams for processing shafts installed in the centers of lathes has developed, taking into account the principle of constancy of bases and the presence of an error in pre-centering the initial shaft workpiece.
Optimization of filtration process management in hydrometallurgy
Authors: Kustashev P A , Kazakovtsev L A , Rozhnov I P , Kirikov I N , Burmistrov E P
Published: February 2021

In the process of processing deactivated catalysts, there are problems that arise at each of the stages: in the process of filtration, carburizing and obtaining a concentrate of platinum (palladium) for transfer to refining. When considering these problems, we come to the conclusion that the purity of mother liquors affects the quality and time of catalyst processing, as well as the production of a concentrate with no impurities. The authors proposed to improve the quality of catalyst processing control at the filtration stage after the filter press to install a suspension slip control device and control automation for sampling and stopping the filter press. Such a change will improve the quality of the resulting concentrate during processing of the deactivated catalyst.
Investigation of MOSFET power losses in emergency mode of buck converter
Authors: Andriyanov A I , Malakhanov A A , Butarev I Yu
Published: February 2021

Operation modes of the compact SOT-23 package MOSFET in the high-frequency buck converter are considered. Transient analysis of a switching processes in the MOSFET based on a reliable SPICE model is obtained. Analysis were carried out in a wide variation of the supply voltage and load resistance in order to estimate energy losses in desired and emergency modes accompanied by a large amplitude of output voltage fluctuations of the converter. Converter operation in emergency modes with the increased transistor losses, which is related with an increase of the effective current value is shown. The possibility of high-frequency ripples occurrence on the transistor during the operation of the converter in the discontinuous-current mode is demonstrated. A circuit, consisting of the parasitic capacitance of the transistor and the inductance of the output filter which requires taking measures to compensate for these oscillations on practice in the discontinuous-current mode is shown. Investigated transistor demonstrates acceptable behavior in the circuit with the selected parameters, and the increase in energy losses during the transition to emergency modes is obtained. It requires special attention to design process for converters based on small-sized transistors in the SOT-23 package, since the latter have limited heat sink capabilities.
The optical sensor for detecting NO2 and O3 using a white GaN LED
Authors: Novikova Yu A , Ryzhikov M B , Tereshchenko G V
Published: February 2021

This article describes the scheme and principle of operation of an optical sensor for detecting nitrogen dioxide (NO2) and ozone (O3) based on the effect of optical absorption spectroscopy. A distinctive design feature of the proposed technical solution is that it is proposed to use an inexpensive powerful white led based on GaN as an optical radiation source, which has two relatively wide radiation peaks at wavelengths λ from 420 to 440 nm and λ from 525 to 650 nm. To separate the light streams and form separate measurement channels, three multilayer optical coatings were synthesized: a broadband beam-splitting coating and two narrow-band reflective coatings.
Semantic model of an exploit’s source code for data protection in automation systems
Authors: Fedorchenko E V , Fedorchenko A V
Published: February 2021

Data protection is especially relevant in automation systems nowadays. The paper proposes a semantic model of exploit’s source code as a basis for unknown attacks detection, forecasting and assessment and therefore for automated data protection from cyber attacks. The proposed model combines a control flow graph with a function call dependencies graph. The paper describes model generation technique that is based on the analysis of exploit’s source code and incorporates code compilation, its decompilation, building the functional semantic models of the exploits, and, finally, comparing these models and generating the standard semantic model of exploits’ source code. Application of the technique for generation of exploit’s model is demonstrated on a case study.
Combined non-convex optimization algorithms based on differential evolution, harmony search, firefly, and L-BFGS methods
Authors: Sorokovikov P , Gornov A
Published: February 2021

The paper presents an approach to the numerical investigation of the problems of finding a global optimum of multiextremal functions, based on the use of bioinspired and local search methods. Three combined non-convex optimization algorithms are proposed and implemented. As globalized bioinspired methods, differential evolution, harmony search, and firefly methods are used. For local descents, we used the L-BFGS method. The numerical study of modifications of the implemented approach has been carried out using known non-convex test functions. The developed algorithms have been applied to investigate the problem of the optimal orientation of the aircraft in space. The obtained numerical results allowed us to demonstrate the efficiency of the proposed algorithms.
On identification of neural correlates of reflection in simple recurrent neural networks
Authors: Bartsev S , Baturina P , Markova G
Published: February 2021

Reflection, that in a general sense means internal representation of the external world, refers to one of awareness levels observed in animals. In this paper we demonstrate the ability of a homogeneous recurrent neural network to solve a problem that requires a reflection. The delayed matching to sample test was chosen as a task which is impossible to pass without an internal representation of an external world. Experiments showed that simple recurrent neural networks can form these representations and store them as neuron firing patterns for several clock cycles. Although the trained network was able to distinguish these patterns easily, the identification of certain stimulus by neuron firing was not practically possible due to minor differences in the level of synchronous firing of a given neuron for different stimuli. Neural networks were shown to be applicable for modeling reflexive abilities, so these simple models may also be used for creation of general technique that ultimately can be applied to recognizing neural correlates of human consciousness.
Tree retraining in the decision tree learning algorithm
Authors: Mitrofanov S A , Semenkin E S
Published: February 2021

Decision trees belong to the most effective classification methods. The main advantage of decision trees is a simple and user-friendly interpretation of the results obtained. But despite its well-known advantages the method has some disadvantages as well. One of them is that decision tree learning algorithm build an “almost optimal” tree. The paper considers the way to improve the efficiency of decision trees. The paper proposes a modification of decision tree learning algorithms by retraining the part of tree at every node training. The classification problems were solved to compare standard decision tree learning algorithms with the modified ones. Algorithm efficiency refers to the percentage of correctly classified test sample objects. Statistical analysis based on Student’s t-test was carried out to compare the efficiency of the algorithms.
Using the iCC framework for solving unconstrained LSGO problems
Authors: Vakhnin A , Sopov E
Published: February 2021

Evolutionary computation is a branch of computational intelligence that is inspired by nature. This algorithm family uses fundamental rules of natural selection to find a better solution when solving optimization problems. The productivity of these methods decreases when the number of parameters to be optimized is extra-large. This area of research is known as large-scale global optimization. Cooperative coevolution is a structure for evolutionary algorithms which tries to solve the curse of dimensionality problem. The cooperative coevolution efficiency of application largely depends on the two settings: the size of each subcomponent(subproblem) and the grouping of variables. The actual work proposes improved cooperative coevolution denoted as iCC. The iCC approach dynamically resizes the groups. iCC starts with a predefined set of subproblems and reduces them gradually during the optimization process. A novel metaheuristic has been developed which is called iCC-SHADE for black-box optimization problems with a large number of variables. The proposed method has been tested on fifteen optimization tasks from the LSGO CEC’2013 competition benchmark. The experimental results have demonstrated that iCC-SHADE has statistically better performance than CC-SHADE with a static number of subproblems. Also, the effectiveness of iCC-SHADE has been tested in comparison with other modern metaheuristics. The Wilcoxon rank-sum test was used to compare the effectiveness of investigated metaheuristics.
Simulation modeling of manufacturing
Authors: Kormin T G , Ovchinnikova V A , Tsumbu J-D B
Published: February 2021

Effective management and possession of smoothly running design processes of production, deliveries, is an integral part of the modern enterprises. One of the main instruments of planning of production is simulation modeling. New tools for digital production support decision-making at design of production systems. Modeling of processes is faster way of finding of the correct solution in view of generation of exact forecasts, allowing to evaluate different alternatives. The research, the showing results received when using techniques of the simulation modeling and careful production created in program providing Tecnomatix Plant Simulation is presented in article. Visualization of all processes presented in article shows advantages and shortcomings of the offered optimization techniques, allowing to draw a conclusion on how many effective or not effective will be a developed system.
Water pollution time series analysis
Authors: Drozdov I Yu , Petrusevich D A
Published: February 2021

The time series of the ammonium ions, phosphates in river water and the BOD (biochemical oxygen demand) prediction in river water are analyzed in the paper. These time series have got missing values. So, the first problem is to handle missing data. Splines are implemented to fill the data. After that the mathematical models of each time series are tested and models of dependencies between time series are analyzed. The ARIMA (p, d, q) models are used to explain time series behavior with its previous values. The ArDL (p, q) models and linear regression models are constructed in order to describe dependencies between time series. Quality of river water is very important ecological problem. Mathematical models are able to provide analysis of water pollution. The proposed methods can be used in other problems of analysis of time series with missing data.
Influence of various components of errors on the results of approximation using orthogonal functions
Authors: Zhitnikov V P , Sherykhalina N M , Zhitnikova N I , Muksimova R R
Published: February 2021

The possibility of Legendre polynomials application for approximating functions in order to avoid problems with poorly conditioned matrices for using the least squares method is considered. It is shown that the solutions based on the methods of numerical integration have a large error, which does not allow the idea of orthogonalization to be applied to functions given in a table. However, the use of Legendre polynomials as basic functions instead of algebraic ones in the least squares method can significantly improve the conditionality of matrices. In the problem of approximation of periodic functions by finite Fourier sum the numerical integration is also required. But in connection of the Euler-Maclaurin formula, the numerical integration error of periodic functions is essentially less than of polynomial integration, so the problem is solved very accurately and fast.
An aggregation decomposition for the analysis and synthesis of spacecraft control systems
Authors: Kartsan I N , Efremova S V , Zhukov A O
Published: February 2021

This paper focuses on the interconnections between the variants of assembling the elements of spacecraft control systems within the considered alternative graphic formalization approach. Under these circumstances, the assembly variants of the system elements or their sets are depicted as peaks of an alternative graph, with arcs representing interconnections. The aggregation decomposition method in the analysis and synthesis of the structure of complex systems includes two interrelated stages: sequential decomposition of objectives, functions, tasks, etc., performed by the system, and their aggregation at appropriate detail levels.
Approach to evaluating the organizational effect of the intelligent technological control system
Authors: Smirnov V A , Antokhina Yu A , Semenova E G , Milova V M , Smirnova M S
Published: February 2021

The article considers the issues of evaluating the organizational effect of the intelligent decision support system functioning for the control of complex technical systems. An approach to the indicator formation of the organizational effect of the intelligent system functioning at the level of a technological control system is proposed. A diagram illustrating the proposed approach is presented. It combines, an organizational goal and objectives of introducing an intelligent system, its main functional capabilities, a system of factors that significantly affect the magnitude of a positive effect, a system of sources used to implement certain factors, qualitative assessment criteria potential positive effects from the implementation of the system, the system of indicators of the organizational effect and mathematical models and methods of their calculation by cause-and-effect relationships. A comparative evaluation method was applied to determine the organizational effect of the intelligent system functioning. It is based on the values comparison (difference) of the generalized indicators of the effect of the technological control system functioning with and without the intelligent system. In comparison with the existed methods, the proposed approach to evaluating the effectiveness of an intelligent decision support system is based on a hierarchical system of indicators characterizing the organization of the technological control system for complex technical systems. The obtained theoretical results can be applied in the development and implementation of information systems to evaluate the preliminary, potential, planned and actual effect and organizational efficiency.
Mobile bricklaying robot as a breakthrough technology in construction: advantages and problems
Authors: Malakhov A V , Shutin D V , Marfin K V
Published: February 2021

The article discusses the concept of “breakthrough technologies” and its criteria in relation to a bricklaying robotic system. In order to become a breakthrough, a new technology must be able to deeply integrate into the relevant industry. This requires the fulfillment of a number of criteria, both technical and beyond. Therefore, a number of such criteria have been formulated for a mobile robotic bricklaying system to assess the degree of compliance with industry requirements and readiness to become a breakthrough innovation. Also the systemic problems hindering the implementation of the technology in the construction industry are considered. The developed approach can also be used for other technical systems and complexes that require significant development costs and at the same time offer some innovative approaches to solving the problems in their fields.
Algorithmization of processes for detecting vulnerabilities of UMV interfaces based on probabilistic automata
Authors: Skatkov A V , Bryukhovetsky A A , Moiseev D V
Published: February 2021

The algorithmic approach based on the methods of adaptive intelligent technology for monitoring the state of objects of computer systems is considered. The approach is focused on the detection of changes in the state of controlled unmanned vehicle resources: communication channel, processor, memory. An adaptive model using the Bayesian classifier for assessing changes in the state of unmanned vehicle resources is presented. The model is based on a probabilistic automaton with adaptive self-tuning. The approach proposed in the article is focused on solving problems of detecting moments in time of changes in the state of controlled unmanned vehicle objects, which are resources: communication channel, processor, memory.
Evaluation of the use of the PLP-01M microwave laboratory system using working samples to control the accuracy of the results of examining product samples for lead content
Authors: Rebezov M B , Tretyak L N , Solodov S A , Galaev A V , Korneev I N
Published: February 2021

In order to compare the results obtained when working on the Kvant-2AT atomic absorption spectrometer, taking into account the use of the PLP-01M microwave laboratory system and during sample preparation in accordance with GOST 26929 “Raw materials and food products. Sample preparation. Mineralization to determine the content of toxic elements”, on the working samples, the products were selected that most fully covered the range of results obtained during the research. Within 30 working days, a set of research results and analysis of data obtained during operation on the Kvant-2AT atomic absorption spectrometer, taking into account the use of the PLP-01M microwave laboratory system and during sample preparation in accordance with GOST 26929, were carried out. Average values obtained under conditions repeatability were recorded in the table. In order to assess the accuracy of the obtained values, the analytic, lead, was added. The implementation of sample preparation methods taking into account the microwave decomposition of the sample in the case of using the PLP-01M microwave laboratory system and during sample preparation in accordance with GOST 26929-94 achieves the precision of the analysis results both under conditions of repeatability and under conditions of intermediate precision.
Variational method for solving the boundary value problem of hydrodynamics
Authors: Sysoev D V , Sysoeva A A , Sazonova S A , Zvyagintseva A V , Mozgovoj N V
Published: February 2021

The analysis of the application of the variational method for solving the boundary value problem of hydrodynamics is carried out. From the point of view of numerical research of mathematical physics problems, these variation formulations are considered as the basis of projection methods (the Ritz method). The article presents the main techniques that allow reducing the cost of machine time and speed up the convergence of the computational process when calculating the hydrodynamic characteristics of cavities of various configurations. Using the Trefts method allows you to reduce the calculation time of the boundary value problem. The green transformation allows us to reduce the three dimensional integral to a one-dimensional. This creates a universal method for determining hydrodynamic coefficients for rotation cavities with an arbitrary contour of the Meridian section. However, for most configurations of cavities, the convergence rate is satisfactory and provides numerical values with a high degree of accuracy.
Photoluminescent ZrO2:Tb3+ thin films synthesized by USP technique using a metal-organic precursor
Authors: Juárez-López G , Martínez Martínez R , Rojas-Velasco I I , García-Hipólito M , Ramos-Brito F , Velazquez-Cruz E I , Aguilar-Frutis Miguel A , Falcony-Guajardo C
Published: February 2021

Photoluminescent ZrO2 and ZrO2:Tb3+ thin films were synthesized from metal-organic precursor, zirconium acetylacetonate [Zr(C5H7O2)4], using Ultrasonic Spray Pyrolysis method. These thin films were deposited on Corning glass substrates at several deposition temperatures. ZrO2 and ZrO2:Tb3+ (X a/o) films were characterized by x-ray diffraction to identify the crystalline structure; results showed tetragonal phase of zirconia; with a crystalline size of approximately 4 nm according to Scherrer’s formula. Also, SEM micrographs revealed that surface morphology of these films is very flat. Chemical composition microanalysis showed presence of oxygen and zirconium as major species. Analysis by Infrared spectroscopy demonstrates that 900 and 760 nm bands correspond to presence of ZrO2. In addition, these films showed optical transmittances from 75 to 98 % in the visible range. Photoluminescent features varied as a function of excitation wavelength; when excited at λ
ex = 286 nm strong green emission is observed, which is associated to electronic transitions 5D4 → 7Fn (n = 6, 5, 4, 3) corresponding to Tb3+ ions. Excitation with λ
ex = 336 nm exhibits spectra with simultaneous emissions from host lattice and Tb3+ ions; here, observed color was blue-green.
ITO-free OLEDs utilizing inkjet-printed and low temperature plasma-sintered Ag electrodes
Authors: Hengge Michael , Livanov Konstantin , Zamoshchik Natalia , Hermerschmidt Felix , List-Kratochvil Emil J W
Published: February 2021

We report an inkjet-printed indium tin oxide (ITO)-free electrode made from a particle-free silver ink. After printing, an argon plasma is used to reduce the silver ions in the ink to metallic silver. This process does not require high temperatures and is therefore suitable for use with temperature sensitive substrates. Printed silver layers show good optical transmittance and electrical conductivity. To demonstrate the capabilities of the electrodes, inverted ITO-free organic light-emitting diodes (OLEDs) were produced via solution processing. In terms of luminance and efficacy, the devices containing the printed electrodes show improved luminance and current efficacy compared to ITO-based reference devices. When fabricated with flexible substrates, the printed OLEDs show high bending stability, enabling flexible applications.
An analytical approach for frequency modulated thermal wave imaging for testing and evaluation of glass fiber reinforced polymers
Authors: Rani Anju , Mulaveesala Ravibabu , Kher Vansha
Published: February 2021

Frequency modulated thermal wave imaging (FMTWI) has been considered as one of the promising non-destructive testing and evaluation approach due to its merits such as economical, safe, fast, sensitive and high depth resolvability. The present work provides a novel analytical solution for FMTWI using one-dimensional heat conduction equation with adiabatic (Neumann) boundary conditions. The temperature gradient over the glass fiber reinforced polymer specimen has been analyzed and validated with a commercially available three dimensional mathematical finite element model to retrieve the quantitative information regarding the subsurface defects. The efficiency of the proposed method is highlighted using matched filter based approach for a frequency modulated imposed heat flux. The depth resolvability of the proposed method has been studied from the obtained correlation lag and the time domain phase obtained for FMTWI technique.