bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of intermolecular interactions of epoxy binder components on rheological properties and wetting ability
Authors: Barabash E , Popov Yu , Danchenko Yu 
Published: December 2019

Abstract
The purpose of this paper is to evaluate the degree of intermolecular interaction of the surfactant and epoxy oligomer ED-20 molecules and to establish regularities of the influence of this interaction on the rheological properties of the epoxy binder. For that purpose computer modeling and quantum chemical calculations of the interaction parameters of modifying additives with ED-20 have been investigated. For the experimental evaluation of the intermolecular interactions degree of the epoxy oligomer with additives, the viscosity rheological properties and wetting ability of binary mixtures were studied. Result of studies have shown that the higher the intermolecular interaction energy of epoxy binders components is the greater its influence on viscosity and the less they will effect on wetting ability of the binder.
Study of the efficiency of epoxy coating protection of concrete surfaces from sulfuric acid corrosion
Authors: Goncharenko D , Aleinikova A , Kabus O , Kolomiiets Y 
Published: December 2019

Abstract
The application of epoxy coatings to concrete is a method of its protection against sulfuric acid corrosion. The problem of ensuring the efficiency of the coating protection conditioned by many factors is considered herein. Penetration of acidic substances through local defects on the coating surface, which causes its swelling and a sharp increase in the corrosion rate, is one of the main factors. Results of the studies of the samples exposed to 5 % solution of sulfuric acid and to the environment of a sewer system with a high content of hydrogen sulfide in the air are described. It is established that the modification of concrete with additives and the increase of its physical and mechanical properties prevent the stability of the “concrete–epoxy coating” system from increasing. To ensure the reliable operation of reinforced concrete structures in an acidic environment, it is advisable to periodically monitor the condition of coatings in order to identify and to timely eliminate local corrosion.
Acid-basic surface properties of dispersed fillers based on metal oxides TiO2, Al2O3, CaO and Fe2O3
Authors: Danchenko Yu , Andronov V , Barabash E , Rybka E , Khmyrova A 
Published: December 2019

Abstract
The dispersed oxide fillers of different chemical composition were investigated: rutile (TiO2), alumina (Al2O3), calcite (CaO) and hematite (Fe2O3). The mineral composition, surface morphology, particle size and specific surface of the fillers were investigated using modern physicochemical methods. It has been established that the acid-alkaline properties of the active surface centers (ASC) and hydroxyl-hydrate layer (HHL) depend on the chemical and mineral nature of the fillers. It is established that with decreasing acidity of the oxide, the desire for its surface to adsorb water molecules from the air increases. As the alkalinity of the oxide increases, the thickness of both the hydroxyl and hydrate surface layers increases in proportion. It is shown that the acid-alkaline properties of the surface correlate with the acid-alkaline properties of the oxides included in the fillers.
Study of the forming processes of the arbolite structure during the chemical activation of flax shove
Authors: Kazimagomedov I E , Trykoz L V , Kazimagomedov F I , Rachkovskiy A V 
Published: December 2019

Abstract
As one of the ways of directed formation of structures in arbolite (wood concrete), the use of properties of organic additive might serve. A capillary-porous, chemically active material is used for this purpose. The structure of capillaries and pores determines the perspective of directed mass transfer within the “binding substance-additive” system, and the chemical activity of flax shove fibers can replace the physical bonds of the components with stronger ones, the chemical bonds. To determine the ways of modification of the additive, an aqueous solution of calcium sulfate hemihydrate (CaSO4·0.5H2O) was applied along with liquid glass. The substantiation of the chemistry of the processes occurring in the wood-cement compositions during their strengthening was given. Analysis of the dynamics of strengthening of the material has shown that as a result of the chemical activation of flax fibers, the internal structure of capillaries and pores experience colmatage, which inhibits water absorption inside them, and also stronger bonds of flax fibers with cement stone are formed. With the application of the proposed technology, the compressive strength of arbolite increases almost 1.4 times, and the strength under transverse bending increases 1.6 times.
Effect of mineral fillers on the wetting of water-based polymer dispersions
Authors: Saienko N V , Demidov D V , Bikov R A , Younis B N 
Published: December 2019

Abstract
To ensure reliable protection of porous plastered facades, water-based polymer dispersions must meet a set of properties for moisture absorption and vapour permeability. One of the most significant indicators in assessing moisture absorption is the hydrophobic properties of the coating, which characterizes their water repellency. Therefore, the article studied the effect of the dispersed mineral fillers content based on silicates and aluminosilicates on the wetting of water-based polymer dispersions and determined the possibility of their use as decorative and protective materials for plastered building facades finishing. It was found that the studied samples of water-based polymer dispersions can be used as facade coatings with high vapour permeability and low moisture absorption, which is confirmed by studies of the contact angle. The optimum values along the contact angle verge towards the hydrophobic coatings.
Short-term strength of anchor screws on modified acrylic adhesives
Authors: Sklyarov V , Zolotova N , Suprun O 
Published: December 2019

Abstract
Theoretical and experimental studies of the stress-strain state with a short pulling force acting on concrete smooth steel rods with acrylic adhesives were carried out by such scientists as L.N. Shutenko, M.S. Zolotov, B.Yu. Pagi, etc. However, it should be noted that when performing these experimental studies ordinary acrylic adhesive was used. The purpose of the experimental studies was to determine the short-term strength of anchor bolted joints on acrylic adhesives using various modifiers and the depths of bolt insertion. As glue in the manufacture of prototypes of anchor bolted joints, a modified acrylic composition was used. If we accept the strength of the ZnO seal as 100 %, then the strength of the ground mica and methacrylic acid seals differ by 0.35 MPa and 3.5 %, respectively. The results of experiments to determine the strength of anchor bolted joints are systematized depending on the diameter of the anchors and the depth of their embedment in concrete. Based on our studies and analysis of experiments by other researchers, it is recommended that anchoring bolted joints to a depth of l = 8ds.
The effect of the mobility of the concrete mixture on the air content and frost resistance of concrete
Authors: Tolmachov S M , Brazhnik G V , Belichenko O A , Tolmachov D S 
Published: December 2019

Abstract
In the technology of building roads, bridges, buildings and structures, concrete mixtures of different mobility are used. It depends on the complexity of the design, equipment and technical requirements. The main requirement for any product or design is high durability. The main index of durability is frost resistance. To increase the frost resistance of concrete, an additional network of air pores is created. This network is formed through the use of airentraining additives and when the concrete mix is mixed. Different quantity of air may enter in concrete mixes of different mobility. But an increase of the quantity of air involved leads to a decrease of concrete performance. Therefore, it is necessary to know the volume of air bubbles and how they change the properties of concrete. The work shows how the mobility of concrete mixtures affects on the amount of air involved. The results of studies of frost resistance of concrete made from mixtures of different mobility are presented.
Features of studying the efficiency of fire protection of a wooden wall with external exposure to the flame of combustible substances
Authors: Tsapko Y , Bondarenko O , Pinchevska O , Buys’kykh N , Lakida Y 
Published: December 2019

Abstract
The article analyzes the physical ways to provide the necessary limit of fire resistance of wooden structures, which have significant disadvantages, namely, leading to significant material costs and increase the volume of structures. Modern methods of fire protection of building structures are based on the use of blocking coatings, which are complex systems of organic and inorganic components. Studies of the combustibility of wood have shown that a raw specimen of timber construction is capable of engaging and spreading flames on the surface. Instead, the structure treated with the organo-mineral protective coating did not burn after combustion of the model hearth, respectively, and did not break down. The swelling of the protective coating was recorded, and the temperature on the reverse floor was less than 140ºC. As a result, it was ascertained that the effectiveness of the shredded image of the tree’s construction was 4.4 times higher for the protected organic and mineral coatings 3.3 times higher - for the clear protection of non-organic ones. It’s necessary to assimilate a coke ball on the surface of the construction, which will add to the temperature and the temperature glyphine, with which the hour of reaching the boundary temperature will be improved.
Designing and FEM simulation of the helicopter rotor and hub
Authors: Skiba K 
Published: December 2019

Abstract
The paper presents a preliminary design of the three-blade rotor. The geometric model was prepared in the Siemens NX 12.0 programme. After the preparation of the model and kinematic analysis, the structure was checked for strength by means of NX Nastran software. In addition, structural solutions of bearing rotors currently used in the construction of helicopters were discussed and a comparative analysis of the developed rotor design with other rotors was carried out in order to define the basic advantages and disadvantages of each solution. The main rotor of a helicopter is considered the most important component of the rotorcraft, which determines its performance. Rotating blades generate the resultant forces and moments in the rotor hub that allow the helicopter to fly. In the case of a single-rotor helicopter design, a tail rotor must be added to obtain directional control. Cyclic and collective control of blade inclination influences the generation of aerodynamic and inertial loads, which depend on the azimuthal position of the blade on the rotor disc. The number of rotor blades and the properties of the blade-hub connections strongly influence the level of load transfer from the blades through the hub to the helicopter fuselage. By incorporating a set of hinges, it is possible to reduce the component loads of the rotor, tilt and rolling moments transferred to the hull. A conventional articulated rotor head with built-in hinges requires frequent maintenance, which increases helicopter operating costs. Furthermore, a complex structure with a large number of components increases the weight of the articulated rotor.
Computer modelling of automobile engine performance as the source of implications for automobile technology management
Authors: Orynycz O , Tucki K , Wasiak A , Mruk R 
Published: December 2019

Abstract
The need for finding the replacement for fossil fuels causes several technical and technological problems in the engine construction as well as the fuel production and its standardisation. This particularly concerns biofuels. The variety of biological resources and possible conversion routes leads to the multiplication of fuel properties. The regional dependence of biomass resources might cause interregional incompatibility of fuels, which should be avoided. Our previous studies have shown that computer modelling is capable of providing information on the dependence of engine performance upon the type of the fuel used, also under conditions of simulation of road tests. Based on computer simulations of the given engine cycle, the impact of the use of biofuels on carbon dioxide emissions from a diesel and gasoline engine was analysed. The tested fuels were: gasoline 95, diesel, ethanol, DME dimethyl ether, and FAME fatty acid methyl esters. The differences in CO2 emissions of the tested fuels were large (up to 17%), but none of the analysed fuels exceeded the maximum emission limits allowed by legal regulations. The results of such simulations might be used for planning the development of various types of engines -possibly adjustable to fuels of various origin, as well as for planning the fuel composition assuring the best performance in a wide spectrum of engine constructions.
Predictive modelling for air temperature and humidity in a mushroom production process
Authors: Awtoniuk M , Daniun M , Komarchuk D , Syrotyuk S 
Published: December 2019

Abstract
Mushrooms (Agaricus bisporus) are produced in a growing room with a heating, ventilation and air conditioning (HVAC) system. Cultivation is cyclical and consists of several successive phases. Every production phase has different environmental requirements. Microclimate is a system with multiple input signals (e.g. control signals of the solenoid valves of HVAC system) and multiple output signals (compost temperature, air temperature, air relative humidity and carbon dioxide concentration inside the growing room). This paper presents model for prediction for air temperature and air relative humidity inside the mushroom growing room. To determine the dynamic behaviour of the microclimate, the parametric identification method was used. Several models with ARX structures were created. A fit index was chosen to evaluate the quality of models. Finally, optimal prediction horizon for each model was determined.
Recurrence-based diagnostics of rotary systems
Authors: Ambrożkiewicz B , Meier N , Guo Y , Litak G , Georgiadis A 
Published: December 2019

AbstractRotary mechanisms are commonly used for transferring rotational movement in diverse industrial applications in mechanical engineering. Components such as gears and rolling bearings have found their purpose in various automotive, machinery or agriculture systems. During operation in mechanisms, they are subjected to defects or changes of their key parameters. This paper considers the application of recurrence plots (RP) and recurrence quantification analysis (RQA) in the detection of teeth crack in a planetary gear system and radial internal clearance (RIC) in a double row self-aligning ball bearing. Raw signals are obtained from accelerometers installed in test rigs. The analysis consists of a statistical analysis approach and calculations of basic RQA parameters i.e. recurrence rate, determinism and length of the longest diagonal. In the paper, we extract information about the fault detection in one of the rotary systems and about bearing operational parameters with nonlinear dynamics identification.
Evaluation of structure stability with the use of remote load
Authors: Molski Szymon , Lonkwic Paweł , Ruta Hubert , Krakowski Tomasz 
Published: December 2019

Abstract
It is a quite common practice to place the load at some distance from the machine restraint. In such a case, it is possible to evaluate the values of stresses and displacements by means of numerical analyses. This article presents the numerical analysis results for the carrying structure of the friction lift power unit with the use of the remote load. The impact of the remote load on the strain of the lift power unit carrying structure is also described. Attention is paid to the places of excessive strain of the structure.
Surface quality simulation with neural networks in AZ91D Mg alloy milling
Authors: Kulisz M , Zagórski I , Korpysa J 
Published: December 2019

Abstract
The mathematical model presented in this paper describes the process of milling AZ91D Mg alloy with the TiAlN-coated tool. The experimental data from the neural network training served to determine the effect of various milling parameters on the surface roughness of the workpiece. The 2D roughness measurements were taken on the end-faces of specimens and focused on the set of three parameters – Ra, Rz and RSm. The tests were performed at constant parameters (tool geometry, workpiece strength properties and technological machine properties), variable parameters (cutting speed, feed per tooth, depth of cut) and output variables (Ra, Rz, Rsm). The simulations were executed by means of the artificial neural networks, modelled with Statistica Neural Network software. Two types of neural networks were employed: MLP (Multilayered Perceptron) and RBF (Radial Basis Function). The comparative analysis showed that the discrepancy between the results of simulation and the results obtained from experimental tests is on an acceptable level, not exceeding 15%. The above result confirms that ANNs can be successfully used as a tool for a selection of technological parameters, enabling obtaining the desired values of surface roughness parameters without the need for time-consuming machining tests.
AI-aided e-nose calibration
Authors: Malec A , Suchorab Z , Guz Ł , Caserta C 
Published: December 2019

Abstract
The development of the semiconductor technology and computer methods contributes to the improvements in measurement techniques of air pollution. Besides traditional techniques of air pollution measurement, such as chromatography or dynamic olfactometry, the electronic nose (EN) is attracting an increasing amount of attention in this area. EN is a device which imitates the human sense of smell. The main component of the device is an array of many non-specific gas sensors. The aim of this article is to present the result of calibration of EN composed of MOS (metal-oxide semiconductor) sensor with the use of the artificial neural networks. For data analysis, linear and artificial intelligence algorithms were employed, whose accuracy was compared.
Modelling the monopedal robot
Authors: Niechciał M , Rybarczyk D , Buśkiewicz J 
Published: December 2019

Abstract
The article describes modelling of the monopedal robot with the application of the numerical method for calculating kinematics. The first part presents a short review of the literature on monopedal robots and the theory of such designs. Due to the complexity of the natural solutions of the bipedal locomotion, the monopedal alternative simplifies the problem, by limiting its scope to the pulse movement in one axis– as required by jumping. In the subsequent part, basic mathematical and kinematic relations connected with a chosen designs. The model was based on a rigid quadrangle driven by a four-bar linkage. The effect was a set of vector equations, required to calculate its kinematics. Due to the complexity of the design, it could not be calculated using traditional analytical methods. The prepared kinematic structure was simulated using the numerical method to give the basis for the future experimental tests. The mathematical model was solved in the Wolphram Mathematica environment. Its main purpose was to analyse the movement of the final link that rests on the ground. The results from the simulation were compared to the movement parameters derived from a model designed in CAD software to verify its correctness. All values of links length and starting angular position, required to calculate the model, were taken from the said CAD project.
Finite element simulations of the bending resistance of square profiles with topological modifications
Authors: Estrada Q , Szwedowicz D , Vergara-Vazquez J , Rodriguez-Mendez A , Silva-Aceves J , Wiebe L C 
Published: December 2019

Abstract
Bending resistance is one of the most important requirements in automobile structural members when lateral crashes occur. For this purpose, the current paper studies the bending and crashworthiness capacity of square profiles with topological modifications. Several finite element simulations were carried out using Abaqus/Explicit software. The topological modifications consisted in combining a square cross-section with polygonal and circular simple cross-sections. In all cases, the profiles evaluated were simulated with mechanical properties for aluminium alloy 6063-T5 with the same mass. The feasibility of our numerical study was validated by a three-point bending tests of a square tube using a Shimadzu universal test machine. Additional to the assessment of complex cross-sections, numerical results for simple cross-sections are presented. A better crashworthiness performance is obtained when the square section of a simple profile is reinforced with topological modifications. According to the simulation results, a complex cross-section can improve the crushing force efficiency up to 77.9% with respect to a single square profile. Regarding cross-sections with topological modifications, the best bending resistance and energy absorption capacity is obtained when the square section is combined with a square profile. This means an increase of 9.2 % of energy absorption (Ea) and 5.67% of CFE respect to the cross-section formed by square and triangular shapes.
Information security risk assessment using the AHP method
Authors: Zaburko J , Szulżyk-Cieplak J 
Published: December 2019

Abstract
This paper is concerned with the issues of cybersecurity and it presents AHP multi-criteria analysis methodology applied for assessing the level of real threats arising from cyberspace that affect the information security. Based on the results of surveys conducted among employees of a selected state institution, we carried out an analysis of awareness of the dangers of cyberspace and ways employees respond to incidents in systems. Taking into account the research results, an appropriate mechanism for the provision of an adequate level of information security was proposed.
A preliminary study on the use of EEMD-RQA algorithms in the detection of degenerative changes in knee joints
Authors: Jonak J , Karpinski R , Machrowska A , Krakowski P , Maciejewski M 
Published: December 2019

Abstract
Degenerative changes, according to world literature, are one of the key reasons for disability, especially in the elderly population. Diagnosis and monitoring of the disease consist mainly in clinical examination, bedside interviews and imaging. However, during the healing process, there is currently no tool for fast, cheap, easily available and diagnostics that would be free from ionising radiation and that would enable evaluation of the course of the disease. Therefore, the scientific community is searching for new diagnostic methods, with the potential for wide application in medicine. Registration and analysis of knee joint vibration signals presents a chance for more accurate and faster diagnostics. The method is capable of detecting damage at an early stage, while specifying the selection of optimal treatment methods. Therefore, it seems crucial to develop methods of analysis appropriate for the nature of tested signals. The quality of low-frequency natural waveforms can be improved by filtration in selected bands, eliminating existing artefacts. This paper presents an application of the EEMD-RQA algorithm in the detection of degenerative changes in knee joints. Pre-processing in the form of filtration gives the opportunity to pre-test the usefulness of the algorithm RQA in the ability to create/subsequent development of indicators describing the condition of the joint surfaces examined without the need for surgical intervention.