bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of different grain sizes and heat input on the gas pressure inside artificial resin-bonded sand cores
Authors: Mádi L , Budavári I , Varga L 
Published: August 2020

Abstract
Sand cores are used to form the cavities of the castings. The quality of castings is directly affected by the quantity of the gases released from the cores. During our research, the effect of different grain sizes and heat input on the pressure of the gases evolved from the cores was investigated. The granulometric properties of the sand used for making the cores have a significant impact on the pressure of the gases. Because of the uneven particle size distribution of multi fraction sands, the gas flow conditions in the cores can be different. The gas pressure in the cores made from sieved sands can be changed between 6 and 9 mbar. According to the recorded cooling curve of the melt, it can be established, that in the case of the presented pouring conditions, a solid metal layer with adequate strength could not be developed before the gas could pass through the core/casting interface. This phenomenon may result in gas blowhole defects on the casting surface.
Lightweight Manufacturing of Automotive Parts
Authors: Wadas T , Tisza M 
Published: August 2020

Abstract
In this paper, some material developments and its demands in sheet metal forming for automotive industry will be overviewed. It is not easy to match and meet good performance, low consumption, low emission and high safety with comfort simultaneously, only by applying conventional materials and processes. Due to these factors and needs, continuous material and technological developments in sheet metal forming are required.
Effect of the homogenization and cold deformation on the mechanical performance of Al8006 aluminium alloy
Authors: Pázmán J , Fehér K , Gonda V , Verö B 
Published: August 2020

Abstract
In our study, the base material was the aluminium alloy of Al8006. Its application area covers amongst others the material for multilayer tubes. This alloy has been subjected to different technological paths consisting heat treatments (homogenization) and mechanical strengthening technologies: multiple forging, equal channel angular pressing. The aim of the technological paths was to refine the primary phase structure, and to look for the technology sequence that assures the highest strength and the highest toughness at the same time. To determine this, a complex performance index has been created that integrates these property characteristics.
Mechanical properties of AlSi10MnMg matrix syntactic foams filled with lightweight expanded clay particles
Authors: Szlancsik A , Kincses D , Orbulov I N 
Published: August 2020

Abstract
Compression tests measured the mechanical properties of AlSi10MnMg matrix syntactic foams filled with lightweight expanded clay particles (LECAPs). The metal matrix syntactic foams were produced by low-pressure liquid state infiltration method. Two types of LECAPs were used during production. One with ∼3 mm diameter and the other type with ∼9 mm diameter. The samples were machined and heat treated. The T6 heat treatment caused a significant increase in the properties in terms of plateau strength and absorbed energy. Also, the heat treatment caused a different failure mode in the case of the LECAP-9, which is why the absorbed energy increased by ∼50% compared to the as-cast sample.
Influence of pack cementation time on the microstructure of Cu nanofoams processed by dealloying
Authors: Péter Jenei , Han Gigap , Tran Hung Pham , Choe Heeman , Gubicza Jenő 
Published: August 2020

AbstractCopper nanofoams were processed by dealloying for a prospective application as a Li-ion battery anode. The precursor material was produced by pack cementation. The effect of length of pack-cementation time on the pore structure and the microstructure of the struts was investigated in this study. It was found that for high pack-cementation times a hierarchical pore structure with nano- and micro-sized pores was formed. In addition, the longer the pack-cementation time, the lower the crystallite size and the dislocation density in the struts. A very high twin fault probability was also detected, irrespective of pack-cementation time.
Flame retardancy of recycled PET foam
Authors: Szabó V A , Dogossy G 
Published: August 2020

Abstract
Although significant marketing efforts have been made in recent years to reduce polymer use, the number of plastic bottles being discarded is increasing worldwide. The global environmental-socio-economic problem posed by polyethylene terephthalate (PET) bottles can only be solved by expanding large-scale recycling opportunities, while reducing the use of pure raw materials. In this article on the large quantities product of PET was upcycled with chemical foaming. During the experiments 2 m% chain extender and 4 m% chemical blowing agent and different amount of brominated flame retardant was used. The invested materials were examined with standard mechanical tests, scanning electron microscopy and UL-94 standard flammability test. After the investigation it was found that the crystallized blue PET bottle re-granulate can be used forming a flame retardant closed cell foam structure.
Investigation of the interfacial adhesion of glass bead-filled multicomponent injection moulded composites
Authors: Suplicz A , Boros R , Semperger O V 
Published: August 2020

Abstract
Polymeric materials are often combined with fillers and reinforcements, which modify their properties. The goal can be for example the improvement of thermal and mechanical properties or a reduction in costs. On the other hand, these materials can have negative effects too. In multicomponent injection moulding or in the case of products with weld lines, bonding problems can occur. In this research project, we analysed the effect of glass fibre and glass beads, and the most important technological parameters, melt temperature and holding pressure on the bonding strength between multicomponent injection moulded parts. The test samples were produced with a special injection mould, and the tear-off tests were performed on a tensile testing machine with a grip we developed.
Fatigue tests of zinc aluminium matrix syntactic foams filled with expanded perlite
Authors: Kemény A , Katona B , Movahedi N , Fiedler T 
Published: August 2020

Abstract
Metal matrix syntactic foams (MMSFs) are cellular materials which have high specific energy-absorbing properties accompanied by lower density compared to the bulk material. A special type of closed-cell metal matrix foams (MMFs) is the metal matrix syntactic foam. In this research, fatigue tests were carried out of ZA27 zinc aluminium matrix syntactic foams filled with expanded perlite. The stress levels were defined from the plateau stress of the quasi-static upsetting tests (90; 70; 50 and 30%) with R=0.1 stress ratio and f=10 Hz frequency. The results were evaluated statistically.
Investigation of VVER-1200 reactor pressure vessel’s material
Authors: Kovács Dorina , Kemény Dávid 
Published: August 2020

Abstract
At high temperature and pressure, the reactor materials are exposed to various radiation. Irradiation causes significant changes in the crystal structure and their mechanical properties. The mechanical properties of low alloy steels generally do not change so much with temperature. The aim of this research is to prepare the basic measurements to investigate 15Cr2NiMoVA steel, according to MSZ EN ISO 148-1:2017. Charpy impact test was made at different temperatures from -75 °C to 200 °C. Potentiodynamic tests were used to determine the corrosion rate. During the optical microscopy measurement, MnS inclusions were found in the examined material.
Neutron Irradiation of Zirconium Alloys in the Budapest Research Reactor
Authors: Szenthe I , Gillemot F , Horvath M , Hózer Z 
Published: August 2020

Abstract
Sustainable and increasingly safe operation is one of the constant goals of various technical and economic developments related to nuclear reactors. Reliability of the fuel elements cladding is basic for the safe and economic operation, to select the best fuel clad large number of simulations must be carried out in different operational conditions and supported by experimental results. Two types of cladding tube material had been irradiated in the a BAGIRA irradiation loop at to obtain aged clad properties. The special design of the irradiation target holder allowed the specimens to be irradiated with different fluences and at a prescribed temperature. The irradiated specimens will be tested and the measured properties will be used to simulate the aged fuel clad behaviour. This paper introduces the design, preparation and implementation of the irradiation of fuel clad materials.
The influence of the base material - filler metal pairing on the fatigue crack propagation of 700 MPa strength category welded joints
Authors: Lukács J , Mobark HFH 
Published: August 2020

Abstract
In the field of welding of high-strength structural steels, the 700 MPa strength category represents a kind of boundary. Overmatched (OM) consumables are also available, but the behavior of various mismatch types under cyclic loading condition is not yet clear. In order to know the fatigue crack propagation resistance of 700 MPa strength category steels and their gas metal arc welded joints fatigue crack growth tests were performed on statistically representative samples. Matching/overmatching (M/OM) mismatch type was tested, the tests results were analyzed and fatigue crack propagation limit curves were determined. The different mismatch types, our and previous results were compared. It can be concluded that M type is the optimal and M/OM type is more beneficial than simple OM type.
Examination of correlation between the granulometric properties of molding and core sand mixtures and their production parameters
Authors: Hudák Henrietta , Varga Dr. László 
Published: August 2020

Abstract
Foundry technology uses a lot of several natural materials. The chemically bonded sand mixtures main component is the foundry sand approx. 90-98%. Sand properties depend on it has chemical and mineralogical composition; mainly particle-size distribution and shape of grains and its size and sand surface texture. A comparative measurement of 3 foundry sand with different surface quality was carried out. Chemically bonded sand mixtures were prepared to measure their gas permeability and 3-point bending strength. A new qualifier number, CQi was used to compare our investigations.
On the analysis of the stress state of a pipeline’s bend by its height position
Authors: Abdrazakov F K , Mirkina E N , Mikheeva O V , Orlova S S , Pankova T A 
Published: August 2020

Abstract
When underground laying, the pipeline bends in accordance with the terrain under the influence of its own weight and an overlying layer of soil. The article provides calculations of the radius of curvature of the pipe and its comparison with the allowable one. Thus, it can be seen from the above calculations that the obtained radii are less than the minimum permissible radius of curvature. Calculations showed that the radii in the horizontal and vertical planes are acceptable.
Materials used in the construction of roads
Authors: Aleroeva L S , Magomadov I Z , Mamasurov S Kh , Mamatsuev R A , Aptaev Kh Kh , Aisungurov N D , Istamulov A M , Bekishev A L 
Published: August 2020

Abstract
There is a huge variety of materials and technologies used in the implementation of construction and restoration work. They are also used in the construction of roads. It is impossible to consider all their varieties and give them a description. Therefore, we consider only the most effective in our opinion. This article describes and reviews some types of modern building materials and technologies used in the restoration of roads. Some varieties of these materials are listed. Their brief description is given. Their advantages and disadvantages are considered. The introduction contains the significance of materials in construction work. The optimal and most economical materials to use are listed in the summaries and conclusion. Certain types of materials and technologies are described in the article.
Adsorption of aromatic nitro and amino compounds with modified bentonite
Authors: Atamanova O V , Tikhomirova E I , Podoxenov A A , Vedeneeva N V , Grishin M A 
Published: August 2020

AbstractWastewater of many types of industries contribute to the entry into open water bodies of toxic organic compounds, the concentrations of which in some cases exceed the Maximum Permissible Concentration for Water in Commercial Fishery Reservoirs. Typical representatives of toxic organic pollutants in the aquatic environment are aromatic nitro and amino compounds. Currently, a significant number of wastewater treatment methods have been developed. One of the most promising methods of water treatment are adsorption methods. Of considerable interest is the use of natural clay minerals as sorption materials for wastewater treatment. The object of the study is model solutions of nitro and amino compounds, the adsorption of which was studied on different versions of modified bentonites. In this work, the adsorption capacity of modified bentonite with five different acid activation variants upon extraction ofn-dinitrobenzene ando-phenylenediamine from solutions was studied. The adsorption parameters of the studied variants of bentonite, such as the adsorption value G, mg/g; interfacial distribution coefficient Kd, mg/dm3; degree of adsorption recovery S, %. The constructed adsorption isotherms made it possible to identify the most effective variants of modified bentonite with additional activation by acid to extract aromatic nitro and amino compounds from solutions. The best adsorption ability upon extraction of p-dinitrobenzene from a solution was shown by glycerin-modified bentonite, subjected to heat treatment at 550 °C, the average fraction of granules, after activation with 9 % HCl solution and 30 % CaCl2solution. The best adsorption ability upon extraction of o-phenylenediamine from a solution was shown by glycerin-modified bentonite, subjected to heat treatment at 550 °C, the average fraction of granules, after activation with 18 % HCl solution and 38 % CaCl2solution.
Quaternary reciprocal system Li, K, Pb // Cl, WO4
Authors: Kochkarov Zh A , Baysangurova A A , Khasbulatova Z S , Khubaeva M V , Abubakarova Z Sh , Maglaev D Z 
Published: August 2020

Abstract
There is a topology of the four-component reciprocal system Li, K, Pb ǁ Cl, WO4, its phase diagram was triangulated and stable tetrahedra revealed, the dominant chemical reactions of mutual exchange and complexation were determined. There are chemical synthesis of lead tungstate and lead oxide tungsten bronzes in ionic melts of the Li, K, Pb ǁ Cl, WO4 system carried out. A synthesis technology for lead tungstate in ionic melts is proposed based on the results.
Preparation and stereochemistry of nickel phosphine complexes
Authors: Bisergaeva R A , Hasbulatova Z S , Sirieva Y N 
Published: August 2020

Abstract
The Nickel (II) ion forms many stable complexes as predicted by the Irving Williams series. This experiment is about preparation and stereochemistry of nickel phosphine complexes. The nickel phosphine complexes, which were prepared are NiBr2(PPh3)2 and NiBr2(PCy3)2. The first part of the experiment is to prepare the nickel complexes. After preparing nickel phosphine complexes NiBr2 (PPh3)2 and NiBr2 (PCy3)2, the complexes have been analyzed for structural determination. The complexes were analyzed by the Magnetic Moments of solids-The Johnson Matthey Balance, UV-visible (electronic spectra), Infrared spectra (normal range) and Far-infrared spectra (which were supplied in the practical booklet).
Starogroznensky oil and gas field: historical background and current status
Authors: Daykaev A A , Aydamirova Z G , Abubakarova E A , Shaipov A A , Movlaeva A M , Bachaeva T Kh , Zakriev Kh I , Dzharnagaliev R Z 
Published: August 2020

Abstract
The paper is devoted to one of the largest deposits of the North Caucasus, i.e. Starogroznenskoye field. There are identified the main development stages of this field, i.e. well production, development of the Miocene and Mesozoic deposits, and the current stage. Well production continued almost until the end of the 19th century. At the Miocene stage, the production was carried out from thrust and subthrust sand formations of Karagan and Chokrak. The paper also mentions the experimental adit on Mamakayevskaya gill. Which was headed by mining engineers A.A. Klushin and A.E. Yeronin. The beginning of the Mesozoic stage dates to the end of the 1940s. The main production was associated with the Upper Cretaceous sediments. At the end, an assessment of the current state of the structure of proven reserves is given. In conclusion, an assessment of the opportunities aimed at further development of the field associated with the additional exploration and additional development of the Miocene and Lower Cretaceous deposits is given.
Strength and deformation characteristics of fiber concrete modified with a peat additive
Authors: Demyanenko O V , Gorlenko N P , Sarkisov Yu S , Kopanitsa N O , Gorynin G L , Ikonnikova K V 
Published: August 2020

Abstract
Dry mixtures are widely used in modern construction. Development of new modifying agents for improving of dry mixtures performance characteristics and increasing its economic efficiency is an important problem. The paper presents study results of the effect of additives based on thermo modified peat on properties of cement mortars. It is established that introduction of additives in the mortars compositions provides improving of their strength and deformation properties.
Solution of multidimensional system with XY differentiation of probability density equations for identification of silver nanoparticles on fibers
Authors: Emelyanov V M , Dobrovolskaya T A , Emelyanov V V 
Published: August 2020

Abstract
The article presents the results of compiling and solving a system of multidimensional differential correlation equations of probability densities for identifying colloidal silver nanoparticles on polyester fibers with multidimensional correlation components of Raman polarization spectra. A method is proposed for increasing the accuracy and speed of identification of silver nanoparticles on polyester fibers, taking into account the longitudinal and transverse polarization of laser radiation over the entire range of the Raman spectrum with the analysis of two peaks sequentially and in order at the same time along the X-side and along the Y-side of the fibers. To implement the method, a program was developed in the Mathcad software. When solving the system using the nonlinear quadratic and differential equations with respect to XY, the probability density equations of distribution ellipses obtained very high accuracy p0 and p1 up to 10−16.
Geophysical prospecting and well reliability indicators
Authors: Fedorova N G , Dimitriadi Yu K , Muradkhanov I V , Kaverzin S A , Akopov A S , Chernenko K I , Ryapolov N A , Voropaeva E D 
Published: August 2020

Abstract
The paper considers the issues of well reliability indicators (strength, durability, safety) determined using the results of geophysical prospecting of the technical condition of the support as initial data. It is shown that it is possible to establish (recognize) the technical condition of bearing elements of well support, if according to the results of instrument studies, the types of damages are identified, their dimensions are established and actual strength parameters are calculated. Forecasting of service life is connected with the identification of a support element limiting service life of wells and determination of dominant mechanism of its damage for predicted operation period. The definition of well safe operation life is connected with the development of well reliability system. An example of elements included in the well reliability system is given, each of which is assigned a corresponding significance factor. The evaluation algorithm of the impact of properties of reliability system elements on its safe operation life is shown.
Studies of vertical position of building walls via surveying method
Authors: Gairabekov I G , Pimshin I Yu , Mintsaev M Sh , Gairabekov M-B I , Gayrabekova A I , Mishieva A T , Ibragimova E I 
Published: August 2020

Abstract
It is impossible to get a truthful overview of the strain-stress state of any object using the methods recommended by the current regulatory documents to determine the roll of buildings and structures. This paper implements the proposed method of determining the set of roll values by vertical sections of the object. Such a method allows obtaining a detailed picture of deformations, on the basis of which it is possible to develop a qualitative project to restore its design geometry. The paper presents the implementation of methods for determining the complex of values of building rolls with both classical and hinged ventilated facades. The rolls were determined according to 17 vertical sections (9 measurement cycles in total) for a building with a classic facade and 53 vertical sections (53 measurement cycles in total) for a building with a hinged ventilated facade. The results are presented in graphical and tabular form.
Study of static and dynamic geometric characteristics of buildings
Authors: Gairabekov I G , Pimshin I Yu , Mintsaev M Sh , Gairabekov M-B I , Gayrabekova A I , Mishieva A T , Ibragimova E I 
Published: August 2020

Abstract
It is impossible to get a truthful overview of the strain-stress state of any object using the methods recommended by the current regulatory documents for determining deformations. This paper implements the proposed method of determining the spatial geometry of an object. Such a method allows obtaining a detailed picture of deformations, on the basis of which it is possible to develop a qualitative project to restore its operational reliability. The rolls were determined according to 38 vertical sections (9 measurement cycles in total) for a building with a classic facade and 53 vertical sections (2 measurement cycles in total). Besides, five cycles of determination the settlement of structure were performed. The trigonometric leveling was used to control the horizontal position of different level building structures (top of window aperture of the 2nd floor). Elevations of horizontal building structures were determined in different conditional systems of heights. Elevations of horizontal building structures were determined in a single conditional system of heights. The results of the method are presented in graphical and tabular form.
Development of a digital surface model and a digital terrain model based on ERS data
Authors: Gairabekov I G , Hamzatov A I , Mishieva A T , Ibragimova E I , Gairabekov M-B I , Gayrabekova A I 
Published: August 2020

Abstract
The paper considers the development methods of a digital surface model and a digital terrain model of the Dead City territory. The work utilizes the Phantom 4 PRO UAV with high flight stability and excellent shooting quality (camera 20Mg/px) with 4K resolution that allows creating qualitative DSM, DTM with a possibility of storage, processing, transfer on various platforms in different formats.