bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of structural formation in the implementation of the technology for obtaining asphalt concrete mixtures with phosphogypsum and other additives
Authors: Ignat’yev A A , Gotovtsev V M , Razgovorov P B 
Published: March 2021

Abstract
The paper considers the effects of structural formation in dispersed systems and composite materials obtained using the technology of asphalt concrete with up to 30% phosphogypsum included in the mixture. The study of physicochemical and consumer properties of such systems and materials involved using the method of study of surface effects (measurement of a contact angle). One of such materials is bitumen with a non-traditional additive polyethylene terephthalate. The presented microphotographs of modified asphalt concrete mixtures allow to study the changes in the state of bitumen surface. Differential-scanning calorimetry is used to register thermal effects arising from the implementation of technology to modify the properties of materials. It is revealed that obtaining asphalt concrete mixture by pelletizing provides the necessary indicators of the hardened material’s compressive strength. It is determined that the water resistance of asphalt concrete increases at simultaneous introduction of polyethylene terephthalate and industrial waste powder — phosphogypsum — into dispersed system. It is also determined that the specified additives synergistically affect the consumer properties of bitumen and achieve the positive effect of structural formation in asphalt-binding materials, which reveals new prospects of their use in road building.
Possibility of creating composite materials with self-diagnosis function based on the effect of mechanoluminescence
Authors: Tatmyshevskiy K V , Pavlov D D 
Published: March 2021

Abstract
The increasing productivity of modern information processing systems opens up new possibilities for various technical devices. The ability to very quickly analyze a large amount of information allows you to constantly improve technical systems, including autonomous ones. Sensors or primary converters are used to obtain information about the surrounding world or external influences in technical systems. However, modern technologies make it possible to create materials with desired properties - composite materials. The programmable properties of materials can be strength, rigidity, resistance to mechanical, chemical and temperature influences, but it is especially worth noting the possibility of obtaining materials with specified informative properties. These materials include composites containing mechanoluminescent substances. Such materials can simultaneously be housings of any devices or enclosing structures, they can be parts of load-bearing structures of buildings and structures and at the same time play the role of shock and destruction sensors. Using such materials, you can create panels with a self-diagnostic function.
Development of an epoxy inhibiting primer using barium manganate (IV) as a pigment
Authors: Ziganshina M R , Ziganshin I A , Katnov V E , Hannanov A M 
Published: March 2021

Abstract
The properties of anticorrosive coatings based on epoxy resin pigmented with barium manganate (IV) produced by ceramic method have been investigated. Electrochemical tests of coatings based on the developed primer showed inhibiting properties with respect to corrosion processes and also demonstrated that the coatings retain a high adhesion even after exposure to an electrolyte solution for 1000 hours. It has been established that the inclusion of the synthesized pigment in the coatings increases their ability to inhibit sub-film corrosion in steel.
The study of the possibility of X-ray inspection of fiber-optic sensors embedded into the structure of a polymer composite material
Authors: Shipunov G S , Nikiforov A S , Baranov M A , Tihonova A A , Tretyakov A A 
Published: March 2021

Abstract
Annotation. Currently, during the operation of structures, it is important to use the so-called systems for monitoring the state of structures, which in real time allow you to monitor changes in temperature and deformation fields. To diagnose the condition in such systems, various sensors are used, for example, strain gauges, fiber-optic, piezoluminescent. Most modern monitoring systems use fiberoptic sensors because they have more advantages and fewer disadvantages than other sensors. When monitoring the state of a structure, fiber sensors are mounted on the surface of the structure, however, when monitoring structures made of composite materials, it is possible to introduce fiber lines directly into the structure of the composite material at the stage of manufacturing the structure. When fiber lines are introduced into the structure of a composite material, a number of difficulties arise, namely, due to the fragility of fiber lines, breaks are possible both at the exit from the structure and inside. When considering polymer composite materials, the problem of the location of fiber sensors arises due to the resin flow during the process of forming structures. The solution to the problems described above can be the creation of the so-called Smart-layer, in which the fiber lines will be rigidly fixed, which will protect the fiber from breaking, and limit the movement of the fiber during the formation of structures. Thus, within the framework of this work, we investigate the issue associated with the assessment of the location of fiber sensors in the Smart layer after the formation mode. The location of the sensors after the structure is formed is investigated by radiation methods of non-destructive testing.
The use of polymer composite materials in cylindrical gears
Authors: Medunetsky V M , Zenkov V A , Abramchuk M V , Yu Perepelkina S 
Published: March 2021

Abstract
The paper describes the use of PCM-polymer composite materials in the construction of cylindrical gears. Various types of composite materials and their characteristics for gear links of cylindrical gears, in particular with an asymmetric profile, as well as shell forming matrices for their manufacture from PCM are considered. The main issues of ensuring the accuracy of PCM gears for assessing their quality level are presented.
Thermal imaging method for quantitative and qualitative assessment of the acceptable heat losses in configurations of structures in the diagnosis of buildings
Authors: Fedosov S V , Fedoseev V N , Loginova S A 
Published: March 2021

Abstract
The article discusses the possibility of using a hardware thermometric diagnostic method based on a thermal imaging device in energy-intensive low-rise industries. The proposed optoelectronic device, a thermal imager, can operate in real time, store and process information, and transmit the received data to the consumer. The solution, the creation of a model - an algorithm with software, can be used for the purpose of obtaining numerical values of heat losses and the accompanying characteristics of differentiated temperature states with the surface heat transfer coefficient.
Mechanochemical method for recycling construction industry waste
Authors: Abramov M A , Stepanov E G , Dobrokhotov V B , Egorov E S 
Published: March 2021

Abstract
The article deals with the use of metallurgical slag, which served as insulation in the floors of residential buildings, as a secondary technogenic raw materials. The principal possibility of creating components from it for reaction powder concrete using the method of Mechanochemistry has been shown.
Construction of primitive cells of the cubic syngony on the basis of the molecular acoustics method
Authors: Yurchenko S A 
Published: March 2021

Abstract
Topicality of the present article is connected with introduction of new verifying condition, which is required for estimation of structures of cores of the “elementary” lattices of the body-centred cell and face-centred cell (these lattices were proposed in accordance with the Bravais theory), on the basis of theoretical calculations of the ultrasonic velocities, which are directed along the edges of the selected cells and which are verified with the help of the experimental data that were obtained in accordance with the molecular analysis method. The purpose of the present investigation was as follows: to carry out evaluation of the core structures of the elementary and primitive cells of the body-centred and face-centred cell of the crystal lattice of the cubic syngony (for alpha iron and cuprum) in respect of their conformity with methods of the molecular acoustics. The method of the present investigation is based on comparison of values of the ultrasonic velocities (longitudinal velocity, transversal velocity, and velocity within the rod), which were calculated on the basis of the relevant theory and which are transmitted over edges of the primitive cell that is constructed (for alpha iron and cuprum), with the values of these velocities of the ultrasound, which were obtained experimentally with the help of the molecular acoustics method for these materials. Introduction of the additional criterion (requirement) in respect of selection of the least cell on the basis of the molecular analysis has made it possible to draw the conclusion that cores of the “elementary” cells of the body-centred and face-centred crystal lattices, which are determined in accordance with the Bravais theory and which are assumed as the basis of the analysis with the help of the analytic geometry method, are inconsistent with actually existing mechanism of transmission of the ultrasound over the interatomic bonds (edges of the cell). In addition, this conclusion has made it possible to reveal new type (that is, a new syngony), which is the basis of the core structure of these “elementary” cells. The theoretically calculated ultrasound velocities, which are directed along the edges of the primitive cell of the new type (for alpha iron and for cuprum), have been coincident with high accuracy with the values of the longitudinal and transversal sound velocity, as well as with the sound velocity within the rod, which were experimentally established with the help of the molecular acoustics method.
Security management at facilities vulnerable to attack model development
Authors: Ukraintceva D A , Burlov V G , Sipovich D E , Gryzunov V V , Kapitsyn S Y 
Published: March 2021

Abstract
The article describes the development of a ‘security management at facility vulnerable to attack model’. The result is the creation of a mathematical model of managerial decisions. The concept of synthesis-based management is presented. The approach is based on the resolution of the inverse control problem. It is shown that a human decision lies at the core of security management at vulnerable to attack facilities.
Features of high-temperature synthesis in mechanoactivated gamma-irradiated mixtures of triple systems Ti-Al-C and Ti-Al-Nb
Authors: Sobachkin A V , Yu Myasnikov A , Sitnikov A A , Loginova M V , Yakovlev V I , Gradoboev A V 
Published: March 2021

Abstract
Effects of gamma-irradiation on the process of SHS of mechanoactivated mixtures Ti-Al-C and Ti-Al-Nb were studied. Mechanical activation was performed for 7 minutes in planetary ball mill at energy intensity 40 g. SHS was initiated by induction heating with varying time of annealing. Gamma-irradiation was performed on 60Co isotope to absorbed dose 3·104 Gy. Structural parameters of cells of components were calculated. Gamma-irradiation affects components of triple systems in different ways, leading to unsystematic changes in elementary cells. After SHS in powder mixture 80% Ti + 12% Al + 8% C without gamma-irradiation, it was found that product contains Ti2AlC, Ti3AlC2, TiC and unreacted C. Irradiated mixture react fully - diffractogram identifies Ti2AlC, Ti3AlC2 and TiC. Annealing for 2 minutes produces a product with dominant Ti2AlC. SHS in mixture 45% Ti + 12% Al + 43% Nb revealed that product consists of Ti2AlNb, B2-phase, α2-phase and residual Nb and Ti. During synthesis in irradiated mixture without annealing, diffractograms show decrease in level of diffuse background and increase in values of reflection intensities, structural state of products is stabilized. Effect of gamma-irradiation contributes to growth of phases and stabilization of structure synthesized product.
Complex diffusion saturation of carbon steel 1045 with boron, chromium, titanium and silicon
Authors: Guryev A M , Ivanov S G , Guryev M A , Mei S , Quan Z 
Published: March 2021

Abstract
The article presents the results of studies on the formation of a diffusion layer upon saturation of steel 1045 with boron together with chromium, titanium and silicon. The results of tests of diffusion coatings on steel 1045 obtained by simultaneous diffusion saturation with boron, chromium, titanium and silicon under the action of a sulfuric acid solution under conditions of abrasive wear are presented. A comparison is made of the service life of knives for shredding lead-acid batteries made of steel HARDOX 600 and steel 1045 after diffusion saturation with boron, chromium, titanium and silicon. It was found that the simultaneous strengthening with boron, chromium, titanium and silicon made it possible to increase the operational durability of knives for shredding lead-acid batteries by 2.4 times. The possibility of highly efficient use of products made of simple carbon steel with a multicomponent (B + Cr + Ti + Si) diffusion coating instead of products made of hardened alloy steel is shown.
Multi-phase ion-plasma Cu-Ti coatings deposited on copper and copper beryllium alloy
Authors: Kolubaev A V , Sizova O V , Denisova Yu A , Leonov A A , Teryukalova N V , Novitskaya O S 
Published: March 2021

Abstract
The paper presents outcomes of vacuum-arc plasma-assisted deposition of titanium, titanium nitride and copper on copper (C11000) and the hardened copper beryllium alloy (C17200) at a temperature of 320÷k330°C. The study has revealed that multi-phase coatings form when varying discharge currents generated by arc evaporators and supply sequences of producer gas (argon) and nitrogen. An X-ray phase analysis has demonstrated these coatings to consist of copper, titanium and CuTi, CuTi2 and TiN compounds. Another important outcome to emerge from the study is that ion-plasma processing results in ageing of copper beryllium alloy and furthers the formation of CuBe particles. The microhardness of Cu-Ti coatings is as high as 400÷540 HV0.02 provided that the elements are vacuum-arc deposited at a temperature of 320÷k330°C. The microhardness of a nitrogenized Cu-TiN surface layer is measured to be 760 HV0.05. The thickness of deposited coatings is within several micrometers, so the measured hardness hardly complies with the real characteristic of coatings because the indenter breaks a thin hard layer. In addition, vacuum-arc sputtering of titanium and copper cause metal drops on the surface, as a consequence, the hardness of coatings is below referential values.
Obtaining and painting properties of red iron oxide pigment from spent pickling solutions
Authors: Xolmurodov T A , Svetlakov A P , Mirzaev O O , Katnov V E , Mirzayeva M A 
Published: March 2021

Abstract
A technique has been developed for producing iron oxide pigment based on galvanic waste. The effect of the norm, concentration and nature of the precipitant, temperature and time on the deposition of Fe(OH)3 was studied. To determine the effect of the nature of the neutralizer on the phase composition of the pigments, an X-ray phase and thermogravimetric analysis was carried out. It was established that the main phase is Ca2Fe2O5, and p-Ca2SiO4 is present as an impurity. The basic physicochemical properties of the obtained pigment were studied.
Kinetic modeling and analysis of pyrolysis of polymethyl methacrylate using isoconversional methods
Authors: Koraiem Handawy M , Yu Snegirev A , Stepanov V V , Talalov V A 
Published: March 2021

Abstract
Pyrolysis the waste plastic into fuel is a promising way to protect the environment. In this study, we study the thermal decomposition processes of polymer Poly (methyl methacrylate) PMMA. This work used the microscale combustion calorimeter (MCC) as a tool to study the degradation. MCC is an applicable method to calculate the material combustion parameters by using milligram samples. The experiments were carried out at four heating rates 0.25, 0.5, 0.75, and 1 K/s. The temperature range in which the pyrolysis reaction occurs is « 300-470 oC. We applied several isoconversional methods such as Friedman, Ozawa, Flynn-Wall-Ozawa (FWO), and Kissinger-Akahira-Sunose (KAS) to estimate the apparent activation energy of thermal degradation of Poly(methyl methacrylate). Determine the activation energy from each method evaluated against the experimental data. With investigation, the FWO method shown much higher values for activation energy for PMMA polymer more than the other two methods, and the average value much higher than the Friedman and KAS methods. On the other hand, as a differential method, Friedman showed more accurate results Ea=216.65kJ/mol, and KAS method 228.61 kJ/mol. Our investigation may give a few experiences to how to more readily portray trial results with hypothetical expectations and essential data for calculating the activation energy of potential pyrolysis reactors.
Structure and properties of a cobalt-chromium-molybdenum alloy obtained by selective laser melting
Authors: Saprykin A A , Sharkeev Yu P , Saprykina N A , Khimich M A , Ibragimov E A 
Published: March 2021

Abstract
Cobalt-based heat-resistant alloys have unique properties that are used in corrosive environments and at high temperatures. The addition of chromium improves resistance to hot corrosion, while molybdenum improves corrosion resistance and strength. When machining a workpiece of a heat-resistant alloy, up to half of the material goes into chips and goes to processing. Modern trends in the development of additive technologies are aimed at saving material, introducing new materials and improving the physical and mechanical characteristics of the resulting products. Selective laser melting (SLM) is one of the additive methods for obtaining bulk metal products and is one of the most promising directions in the development of science and technology in recent years. This paper describes the porosity (the average value was 14 ± 5%), the structure and properties of alloy samples obtained by selective laser melting in the following modes: laser power - 100 W, scanning speed - 350 mm / s, thickness of the applied powder layer - 25 um, scanning step - 100 um, frequency of pulse-periodic laser action (modulations) - 2.5 kHz from a spherical powder of the CoCrMo alloy (66 wt% Co, 28 wt% Cr, 6 wt% Mo).
In vivo biocompatibility and biodegradability of poly(lactic acid)/poly(ε-caprolactone) blend compatibilized with poly(ε-caprolactone-b-tetrahydrofuran) in Wistar rats
Authors: Conde Gabriel , de Carvalho Júlia Ribeiro Garcia , Dias Paula do Patrocínio , Moranza Henriette Gellert , Montanhim Gabriel Luiz , Ribeiro Juliana de Oliveira , Chinelatto Marcelo Aparecido , Moraes Paola Castro , Taboga Sebastião Roberto , Bertolo Paulo Henrique Leal , Gonçalves Funnicelli Michelli Inácio , Pinheiro Daniel Guariz , Ferraz Guilherme de Camargo 
Published: March 2021

Abstract
Poly(lactic acid) (PLA) and poly(ε-caprolactone) (PCL) are two important aliphatic esters known for their biodegradability and bioresorbability properties; the former is stiffer and brittle while the smaller modulus of the latter allows a suitable elongation. The new biomaterials being developed from the blend of these two polymers (PLA and PCL) is opportune due to the reducing interfacial tension between their immiscible phases. In a previous study, PLA/PCL immiscible blend when compatibilized with poly(ε-caprolactone-b-tetrahydrofuran) resulted in enhanced ductility and toughness no cytotoxic effect in vitro tests. There is little published data on the effect of poly(ε-caprolactone-b-tetrahydrofuran) on PLA and PCL biocompatibility and biodegradability in vivo tests. This study focuses on evaluating the behavioral response and polymer-tissue interaction of compatibilized PLA/PCL blend compared to neat PLA implanted via intraperitoneal (IP) and subcutaneous (SC) in male Wistar rats, distributed in four experimental groups: neat PLA, PLA/PCL blend, sham, and control at 2-, 8- and 24-weeks post-implantation (WPI). An open-field test was performed to appraise emotionality and spontaneous locomotor activity. Histopathological investigation using hematoxylin-eosin (H&E) and picrosirius-hematoxylin (PSH) was used to assess polymer-tissue interaction. Modifications in PLA and the PLA/PCL blend’s surface morphology were determined by scanning electron microscopy (SEM). PLA group defecated more often than PLA/PCL rats 2 and 8 WPI. Conjunctive capsule development around implants, cell adhesion, angiogenesis, and giant cells of a foreign body to the biomaterial was observed in light microscopy. Both groups displayed a fibrous reaction along with collagen deposition around the biomaterials. In the SEM, the images showed a higher degradation rate for the PLA/PCL blend in both implantation routes. The polymers implanted via IP exhibited a higher degradation rate compared to SC. These findings emphasize the biocompatibility of the PLA/PCL blend compatibilized with poly(ε-caprolactone-b-tetrahydrofuran), making this biopolymer an acceptable alternative in a variety of biomedical applications.
PCM-net: a refractive index database of chalcogenide phase change materials for tunable nanophotonic device modelling
Authors: Kim Hyun Jung , Sohn Jung-woo , Hong Nina , Williams Calum , Humphreys William 
Published: March 2021

Abstract
The growing demand for multifunctional nanophotonic devices has led to the exploration, and utilization, of a plethora of exotic electro-optical materials. Recently, chalcogenide glass based phase change materials (PCMs) have shown utility as a tuning material for a range of nanophotonic devices. Owing to their low loss, ultrafast switching speeds and wide waveband operation, PCMs are integrated in an increasing number of next-generation tunable components, including integrated photonic switches, metasurface optics and tunable spectral filters. Nonetheless, modelling of PCM-based devices is challenging—both in terms of accurate representation of experimentally derived material properties in different phase states, and standardization of results across the research community. Further, as each device requires optimization of specific performance metrics dependent on their respective application, any inaccuracies will lead to erroneous outcomes. In this work, we introduce PCM-net (http://nekocloud.com/pnet/): an online database of the complex refractive indices of a variety of chalcogenide glass PCMs (such as GeSbTe), as an accessible and indexed repository for data sharing across the PCM community. Refractive indices (n) and extinction coefficients (k) between amorphous and crystalline states are directly extracted from experimentally derived data in numerous academic research articles, and collated into the material resource database. Due to the inaccuracies associated with our data collection methods, this data is supplemented with additional computationally generated data, obtained through WVASE® —a commercial ellipsometry analysis software package. To demonstrate the utility of PCM-net, we provide a NASA application-driven device optimization example using the optical properties of PCMs collected with our database. We anticipate the database providing great use to the PCM community and coordinated research efforts enabled by PCM-net will promote the shared repository for the selection of appropriate PCMs for tunable nanophotonic device design for a range of applications.