bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stability evaluation of soil sites based on fuzzy analytic hierarchy process
Authors: Ma Qingwen , Fan Xinyu , Liu Sihan 
Published: August 2020

Abstract
In order to accurately evaluate the stability of the present situation of the soil site, considering that the stability of the soil site is affected by its own structural characteristics and the external environment, the multiple factors affecting the stability of the soil site are determined, and the stability evaluation system of the soil site is constructed. The evaluation system is divided into three levels: target level, three primary levels and fifteen secondary levels, and four evaluation levels. Firstly, the weight value of the soil site stability evaluation index was determined by AHP, and the rationality of the evaluation index was verified by consistency test. Based on the expert experience and two kinds of ridge type membership functions, the fuzzy comprehensive evaluation model of soil site stability at three levels and two stages was established. Finally, combined with the analysis of engineering examples, it is shown that the fuzzy analytic hierarchy process is an effective method for the stability evaluation of soil sites, which can not only achieve the dual goals of safety, reliability and economic rationality, but also provide a basis for the selection of soil site disease control schemes.
Study on the long-lasting Anti-corrosion Construction Technology of Steel Structure of Service Tower in a Coastal Launching Site
Authors: Gu Yufei , Zhang Lijun , Chen Shaojiang , Feng Jiaoni , Xu Feiran 
Published: August 2020

Abstract
In order to realize the long-lasting corrosion protection of the steel structure of service tower in a coastal launch site under C5-M corrosion environment, a five-layer heavy anti-corrosion system with hot spray zinc aluminum alloy as the base, and the supporting process and control requirements are put forward. And this paper studied on the difficult problems encountered in the site construction process, such as the high requirements of pre-treatment of substrate surfaces, difficulty of the protection of finished products and difficulty of coating process control. The actual construction shows that the proposed measures are limited, the coating effect is good, and the research results can guide the anti-corrosion construction.
Novel concepts for establishing expert support systems to investigate the defect occurring in metallurgical phases in the technology of ISD DUNAFERR Zrt.
Authors: Wizner K , Kővári A 
Published: August 2020

Abstract
Competition among steel companies is intense in order to retain customers and get/gain new ones. Economic operators are much more critical of their suppliers and of the quality of their products due to increasing quality requirements. In addition to quality improvement measures to meet quality demands, cost optimization measures pose a major challenge for manufacturers.
Complaints always require an overview of the manufacturing process of the particular product, as it is essential for product development and can highlight technological issues that can eliminate similar types of complaints (improve product quality).
The investigation of the complaints requires extensive professional experience. Deep theoretical knowledge of the technological process, practical experience and knowledge of the local circumstances are essential. This amount of knowledge is available to the experts in varying degrees, and therefore, in addition to examining the main parameters, the aspects of the investigation may vary considerably. By creating or expanding a unified knowledge base, certain parts of the investigation can be analyzed and automated in higher detail. With this solution, the burden on experts is reduced, uniform investigation becomes possible, and examination aspects can be classified. Further statistical analysis may even make it possible to filter out technological parameters that are critical for quality.
The system described below is primarily designed from a metallurgical point of view, but with the expansion of its knowledge base it is also possible to study additional technological phases.
Investigation of the Melting Point Depression of Copper Nanoparticles
Authors: Somlyai-Sipos L , Janovszky D , Sycheva A , Baumli P 
Published: August 2020

Abstract
In this paper copper nanoparticles (Cu NPs) have been produced by solvothermal method. One of the objectives of the present research was to create Cu NPs using aqueous medium technology. The analysis of the produced particles was performed by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). In the course of the experiments, copper core and organic shell nanoparticles were created successfully. It has been found that the average diameter of the created Cu NPs was 50 nm. The thermal behaviour of these particles was investigated by Differential Scanning Calorimetry (DSC). The melting temperature depression of the one-pot synthesized Cu NPs was 633 °C.
Mechanical property evaluation of closed and open-cell foam structures with finite element method
Authors: Kulcsár K , Kónya J , Zsoldos I 
Published: August 2020

Abstract
In this study, different lattice structures were examined with finite element method. Mechanical stress evaluations were performed on porous structured lattices that consisted simple cubic, face-centered cubic, body-centered cubic, and diamond unit cells. Finite element method simulations showed that structured foams with open and closed cells produced significantly different stress levels depending on their packing fraction. The aim of this study is to provide a basis for the design of an implant system that would promote the process of osseointegration.
Characterization of chemically foamed poly(lactic acid)
Authors: Litauszki K , Kmetty Á 
Published: August 2020

Abstract
This paper presents the characterization of poly(lactic acid)-based chemically foamed foam structures. We used extrusion grade, high molecular weight poly(lactic acid) as matrix material and azodicarbonamide as foaming agent. The resulting foams were characterized by foam density, cell population density, scanning electron microscopy, and based on the fracture surface of the foam cross-section, we calculated cell size distribution. The obtained distributions were fitted with the use of log-normal distribution in each case. We presented the effect of chemical blowing agent content (0.5 wt%, 1 wt%, 2 wt%, 4 wt% and 8 wt%) on the PLA-based foam structure and the effect of processing temperature (190 °C, 210 °C and 230 °C) on cell size distribution.
Simulation of hot rolling by cellular automata
Authors: Hegyes T , Barkóczy P 
Published: August 2020

Abstract
This development is focusing on one of the most complex and important production steps of flat rolled products that is the simulation of hot rolling. During hot rolling two phenomena, work hardening and the process of regeneration of microstructure have strong influence for physical properties of aluminium alloys. Dynamic recovery has importance in the dynamic softening beside dynamic recrystallization in aluminium alloys. Hot rolled and newly modified grain structure is influenced by these dynamic phenomena. Hot rolled grain structure goes through significant changes under further production steps like cold rolling and heat treatments. But aside from these intermediate production steps the microstructure that we get after hot rolling has significant effect on mechanical and grains structure of the final flat rolled product. Proper cellular automata simulations of recrystallization and recovery can be the basis for good technology planning practices.
Determining the optimum heating time of small sized test specimen made from weldable mild steel
Authors: Tancsics F , Ibriksz T 
Published: August 2020

Abstract
The usage of CHT (Continuous Heating Transformations) diagrams for a given steel or equivalent grade, requires knowledge of heating temperature, average heating rate, and the heating time. Definition of these technological parameters are primarily based on the complex relationship system between the geometric, thermal parameters and the heating device. In our research, we mainly focused on those physical key parameters that can mostly influence the heating and transformation rate. These parameters provide realistic, usable data for analysing the process of thermal diffusion and FEA (Finite Element Analysis) tests. During analysis, an easy-to-use function relationship was determined for approaching the heating rate more precisely. This method allows handling the CHT charts easily, within a selected range, regarding weldable mild steels.
Wetting of Non-Reactive and Reactive Metallic Substrates by Brazing Liquids
Authors: Weltsch Z 
Published: August 2020

Abstract
A survey of wetting as central phenomenon in soldering and brazing technologies are presented in this paper. The wettability is expressed by the magnitude of wetting angle. The equilibrium condition is widely investigated in the case of non-reactive partners. The phenomenon is less documented in the case of reactive partners, when chemical reaction (hence, local compositional change) also occur between the contacting phases. The brazing process belongs to this category. The mutual wettability is basic requirement for the formation of strong and durable bonding between the machine parts. Therefore, the correlation between the wetting angle (Θ) and the strength of the resulting bonding will be investigated. Not only the chemical concentration change, but phase transformations may also occure in such brazing procedure, when the contacting partners are reactive. As the chemical potencial of components are also change in this cases, the phase transformations has also impact on the evaluation of wetting angle between the brazing pool and alloy pieces to be joined. This phenomena will also be demonstrated in the case of non-reactive and reactive partners as well.
Conservation purpose material testing of corrosion products on outdoor bronze statues
Authors: Szilvia Szilvia , Nagy Melinda , Juhász Laura , Bubonyi Tamás , Péter Barkóczy , Forgács György , Szatmáriné Bakonyi Eszter 
Published: August 2020

Abstract
A detailed material testing was carried out before the conservation project of the János Arany statues of Garden of Hungarian National Museum. The scope of the testing to analyse the corrosion products on the surface and help to develop the best cleaning and protection practice. Samples were taken from more areas and the samples were analysed by SEM-EDS, XRD, FT-IR methods. This article introduces the results of the testing and the relevant effect to the conservation process.
Preparation of soft magnetic composite from Fe-6.9wt%Si by different heat treatment strategies.
Authors: Kocsis Bence , Varga Lajos Károly , Zsoldos Ibolya 
Published: August 2020

Abstract
Present study investigated the effect of isothermal heat treatment strategies between 800 °C and 1150 °C on the magnetic properties of toroidal samples made from Fe-6.9wt%Si powder. The samples were prepared by classical powder metallurgy method since the classical sheet forming methods no longer work with the high silicon content. Our results presented here are part of a series of comparative experiments where we study the effectiveness of the insulating layers created during and before the compacting of soft magnetic composites (SMCs). Our goal was to create a soft magnetic composite made of ferromagnetic and inorganic insulating material with a frequency limit already in the megahertz range and a Snoek limit of few gigahertz. In the case of samples made from Fe-6.9wt%Si powder, the computed tomography results showed that significant porosity is to be expected after pressing. Its positive effect occurred during the heat treatment in the atmospheric agent, where silicon is precipitated and deposited on the surface of the particle. This coating is an electrically insulating layer at the grain boundaries. Depending on the heat treatment strategy, 1 or 2 ferromagnetic phases were observed. The frequency limit approached the target values, but due to the low value of static permeability, the Snoek limit did not reach the gigahertz range. However, there is a significant improvement in magnetic properties compared to the heat-treated samples in a protective gas.
Effect of Beracha-I type color etchant on the ferrite phase in different type Fe-C alloys
Authors: Renkó József Bálint , Bonyár Attila , Jánoš Szabó Péter 
Published: August 2020

Abstract
In material science, and particularly in metallography, various etching processes are frequently used to visualize grain structure. For some etching processes, it is sufficient to immerse the specimen into the etchant only for a few seconds, but for color etching, samples must be kept in the etchant for several minutes to achieve a colored surface layer. In our research, a measurement environment was created, in which the process of color etching can be observed in real-time. A closed microfluidic system ensured the controlled laminar flow of the etchant. The surface of the observed spherical graphite cast iron and DC01 low carbon steel was monitored from the beginning to the end of etching. Comparing the etching of the spherical graphite cast iron and the low carbon steel samples give a more comprehensive picture of the effect of Beraha-I type color etchant on the ferritic structure. Though the etchant reacts with the same ferritic phase in both cases, the etching process develops in different ways. The layer formation was much faster in the ferritic phase of DC01 steel, compared to ferrite in cast iron specimens.
On kinetics of transfer of interphase borders during contact melting with an electric transfer
Authors: Bagov A M , Khasanov A I , Zubhadzhiev M-A V , Umarova L Kh 
Published: August 2020

Abstract
The mathematical laws of kinetics of the liquid zone growth under the contact melting of binary metal systems in the presence of constant electric current were described; the analytical and graphic solutions to this problem explain the experimental data.
Stable Tetrahedron NaCl – KCl – PbCl2 – PbWO4 in the quaternary reciprocal system Na, K, Pb // Cl, WO4
Authors: Kochkarov Zh A , Baysangurova A A , Khasbulatova Z S , Khubaeva M V , Alarkhanova Z Z , Bataev D K-S , Maglaev D Z 
Published: August 2020

Abstract
The phase diagram of the stable tetrahedron NaCl – KCl – PbCl2 – PbWO4 of the quaternary reciprocal system Na, K, Pb // Cl, WO4 was first studied using methods of differential thermal analysis. Its phase diagram was triangulated and stable triangulating internal sections of NaCl – PbWO4 – KCl.2PbCl2, NaCl – PbWO4–2KCl. PbCl2 and obtained tetrahedra NaCl – PbCl2 – PbWO4 – KCl.2PbCl2, NaCl – KCl – PbWP4, and NaCl – KCl – PbWP4. There are coordinates of three quadruple invariant points revealed.
Geotechnical monitoring
Authors: Gairabekov I G , Kaimov Sh S-E , Mishieva A T , Ibragimova E I , Gairabekov M-B I , Gayrabekova A I 
Published: August 2020

Abstract
The paper considers methods of observation over foundation settlement of buildings and structures on the southern slope of the Veduchi Ski Resort and its accompanying infrastructure. The study was carried out from control stations via geometric levelling of the II class. Based on the results of two observation cycles, the settlement values were obtained, all buildings and structures settled within 0.4–2.2 mm. Based on the data on the limit permissible values presented in the paper it can be concluded that buildings and structures on the southern slope of the Veduchi Ski Resort and its accompanying infrastructure are within the permissible settlement values.
Geodynamic features of the territory of Grozny city
Authors: Gaysumov M Ya , Kerimov I A , Badaev S V , Gaysumov O M , Doduev A A 
Published: August 2020

Abstract
The work contains data on tectonic structure, modern geodynamic activity and materials on the study of negative exogenous processes obtained as a result of the development of oil fields located on the urban land. The analysis of geodynamics of the Tersko-Sunzhen structure located in the central part of the Tersko-Caspian deflection was performed. The history of the formation of this tectonic zone is long and diverse and is determined by its fault-block tectonics. At the present stage, the territory is also defined as geodynamically active, consisting of blocks bounded by faults and fractures, which are characterized by intense movements of the earth’s surface. Stress unloading is expressed in the deformation of rock massif and in case of rapid (stepwise) unloading of tectonic stresses – through earthquakes. A special condition is that Starogroznenskoe and Oktyabrskoe oil fields are located on the territory of the city. To date, the cumulative production amounted to more than 150 million tons of oil. Long-term development of deposits led to equilibrium disturbances of the geological environment with significant change of formation conditions and accordingly to the development of hazardous geodynamic processes.
Synthesis of group compressed-air sources for marine seismics
Authors: Gulenko V I , Zakharchenko E I , Rudakov A V , Zakharchenko Yu I 
Published: August 2020

Abstract
The improvement of geological efficiency of marine seismic survey implies continuous improvement of the entire technological complex used in water areas. This is typically accomplished by using complex linear or spatial non-uniform compressed-air groups. In the development of such sources, in addition to solving a number of purely technical problems related to their placement on board the ship and safe operation, one of the most difficult tasks is to determine the initial requirements for selection of the main parameters of the group, such as the volumes of working chambers sources and geometry of their grouping, as well as other factors determining amplitude, time and frequency of emitted acoustic signals. This study considers the main principles of grouping the compressed-air sources for marine seismic survey. It is shown that the most important factors determining the choice of source parameters and specific research technology include the nature of geological tasks and seismic conditions, which primarily depend on the sea depth in the study area. A simple method of calculating the configuration of linear subgroups with fluctuation suppression is described, as well as examples of building linear and spatial groups based on them with pronounced directional properties are considered.
Resource-saving technology of ceramic brick production with nickel slags of Orenburg Region
Authors: Gurieva V A , Ilina A A 
Published: August 2020

Abstract
The paper considers the problem of using technogenic products in the production of construction materials thus obtaining ceramic products with specified properties both in Russia and abroad. It provides data on chemical and mineralogical composition of initial raw materials, defines pre-calcination and calcination properties of clay and nickel slag. Compositions with different percentage of clay/slag are developed and two-factor experiment is carried out, where the first factor is the percentage of slag in a sample, while the second factor is the sintering temperature of samples. The diagrams show the influence of material composition of clay/slag charge mixture on compression strength, water absorption and density of test samples after firing at a temperature of 900, 950, 1000 and 1050 °C. The obtained results allowed identifying the need for sintering of masses from clay of Khalilovsky deposit with nickel slags of OAO Yuzhuralnickel of Orenburg Region in the production of ceramic brick.
Analysis of carbon fiber destruction by lighting current
Authors: Guschin I A , Erina T N 
Published: August 2020

Abstract
The paper considers the unique properties of conducting carbon fiber composite: specific resistivity at different directionality of layers and critical energy of layering and destruction on the basis of experimental data. High mechanical strength and low specific gravity are noted, allowing its use in aircraft engineering to improve aircraft tactical and technical data of aerial vehicles. Strong anisotropy of electrically-conductive properties affects current spreading through carbon fiber and leads to significant destruction of the material. Theoretical analysis of lightning current spreading along anisotropic-conducting material in the form of extended plate was carried out on the basis of two proposed models of carbon fiber destruction by lightning currents. For the first continuum model an exact analytical solution to the Laplace equation with Neumann boundary conditions via the Greenberg method was found. The criteria for composite destruction was found, and the radius and depth of destruction of a conductive material by lightning current were calculated. Layer-by-layer destruction is considered on the basis of carbon fiber equivalent circuit. The strong anisotropy of the material resulting in the release of full energy in the first layer is taken into account. It is shown that the destruction of the top layer changes the distribution of currents over the remaining layers. The results of numerical modeling of layer-by-layer destruction of carbon fiber for different number of layers are given. The conclusion on the application of criteria to forecast the lightning effects and optimize lightning at the stage of aircraft design is made.
Hybrid modeling of wave processes in the scientific justification of hydraulic solutions
Authors: Kantarji I G 
Published: August 2020

Abstract
To determine the wave or ice load on offshore hydraulic structures, calculation methods and modern mathematical models are used, as well as field observations and laboratory studies. Each of these methods has advantages and disadvantages. Sharing existing methods provides an approach called “hybrid or composite modeling.” Hybrid modeling provides the most reliable approach for designing safe facilities. However, the interaction of the individual components of hybrid modeling requires further research. This article is devoted to the study of the problems that arise when verifying the results of numerical modeling of wind waves using field and laboratory model measurements. The experience of studying the projects of the port-shore protection complex in Imeretinka, Sochi, the LNG terminal in the Ob Bay and the port in the East Bay of the Sea of Japan is used.
Identification of intermittent point source capacity and location of the initial contamination plume
Authors: Kochergin V S , Kochergin S V 
Published: August 2020

Abstract
While working on a model of mass impurity transition for the waters of the Sea of Azov and the Kerch Strait, we calculated the capacity of the immediate point source and identified the location of the initial contamination plume. Contamination source capacity identification is based on minimizing the quadratic functional of the forecasting quality and solving associated problems. Associated problem solving is also used in order to identify the location of the initial contamination plume in the body of water under analysis. The first goal was reached for the Gulf of Taganrog area, and the second one – for the Kerch Strait area. It must be noted that both areas have heavy marine traffic and experience the construction of new transport corridors. Simulation results were produced taking into consideration north-western winds that are dominant in the region. Quantitative experiments show that it is possible to identify the capacity of an intermittent point source of contamination using a three-dimensional model of mass impurity migration, as well as to identify the location of the initial contamination plume.