bluuebunny/crossref_metadata_2025_split huggingface dataset:
Higher Education And Sustainable Development Promotion: International Potential And Its Elaboration In Ukraine
Authors: Zinchenko V V , Boichenko M I , Popovych M D 
Published: January 2021

Abstract
This paper reveals the theoretical and conceptual foundations of the issues of global institutional transformations, transformative strategies of higher education, quality issues, personality-oriented strategies, multiculturalism, communication strategies of higher education. It presents the level and quality of internationalization of higher education in Ukraine, the formation of a worldview basis to stimulate and ways to ensure sustainable development of society, to increase the social responsibility of higher education and to strengthen its functional efficiency for society. In higher education now it is lack of basic systemic knowledge about sustainable development, its aims and ways. The environmental issues are quite often misevaluated as relevant only to natural sciences, social and humanitarian tasks of sustainable development are underestimated. In many countries, especially from former colonial or quasi-colonial status ones, the success of sustainable development policy is crucial dependent on recognition and acceptance of this policy by new generation of citizens. Students as an advanced and socially active part of new generation are the target audience for sustainable development enlightenment. In Ukraine these problems are additionally determined by low participation in international projects and some bureaucratization of such participation.
Analysis of the placebo response to the therapeutic environment
Authors: Korzh Oleksii , Korzh Iryna 
Published: January 2021

Abstract
Placebo is critical for evaluating medical interventions, but it’s also clear that the biology underpinning the placebo effect in humans could have significant clinical and societal impacts. Placebo effects, real responses to false cues, potentially stand at odds with the view that, for adaptive reasons, organisms respond only to true environmental cues. In placebo effects, phenotypic responses are seen in the absence of a biologically active agent. The reason for the increase in the placebo response is largely unknown, but several attempts have been made to overcome this problem. How placebos work is still not quite understood, but it involves a complex neurobiological reaction that includes everything from increases in feel-good neurotransmitters, like endorphins and dopamine, to greater activity in certain brain regions linked to moods, emotional reactions, and self-awareness. All of it can have therapeutic benefit. Reacting to a placebo is not proof that a certain treatment doesn’t work, but rather that another, non-pharmacological mechanism may be present. If placebo responses seen in humans are the result of phenotypic plasticity, then placebo-like effects should be observable in other species—particularly in cases where the environment has been altered to disrupt its reliability. This is the case, and placebo-like effects are seen in a variety of model systems.
Wind energy conversion within agricultural farm using vertical axis turbines of optimized SAVONIUS type
Authors: Scheaua F D 
Published: January 2021

Abstract
Wind force is a considerable resource on the basis of which a significant amount of energy can be obtained, necessary in an agricultural farm that is not connected to the energy distribution network. For this case a low capacity wind turbine can be used as a practical solution, which has the possibility to supply the necessary amount of energy within the farm. The solution is represented by the use of a vertical axis wind turbine with that has component an improved SAVONIUS type rotor. Constructive and energy performance aspects of this rotor type are presented based on studies conducted by various researchers over time, being presented the optimal model to be used in the agricultural farm for energy generation. Values of the energetic performances obtained from analytical but also experimental studies of the optimized models of the turbine rotor with vertical axis that works on the Savonius principle are presented. It is also emphasized the advantage of using this solution in terms of protecting the environment by avoiding fuel burns to obtain the energy needed on the agricultural farm.
Synergy of QFD and FMEA methods to improve workplaces in aircraft wire manufacturing
Authors: Ya Dmitriev A , Mitroshkina T A , Russkikh I V 
Published: January 2021

Abstract
The integration of QFD and FMEA methods for improving workplaces is considered. The use of priority calculations in the QFD method in matrix form facilitates integration with the FMEA risk analysis method. An example is given of improving the work places of supporting operations in the manufacture of dual-use wire & cable products. It is proved that the direction of improving the activities and workplaces in the enterprise management system, determined on the basis of the proposed synergistic FMEA and QFD methods, is an innovative way of developing a wire&cable manufacturing.
Numerical simulation of splashing landing gear on an amphibious aircraft air cushion
Authors: Fevralskikh A V 
Published: January 2021

Abstract
The paper presents the basics of the methodology for modeling the spatter formation of landing gear on an amphibious aircraft hovercraft based on the numerical solution of the Navier-Stokes equations for a two-phase incompressible flow with a free interface (VoF approach) and the disperse medium motion equations (DPM approach). The results of numerical simulation of the water jet collapse in the transverse air flow in comparison with the experimental results are given, as well as recommendations and results of application of numerical simulation in forecasting the air cushion splash formation. The results of the simulation are in good correspondence with the results of the experiments published earlier, which demonstrates the prospects of applying the technique in the development and design of new landing gear layout solutions on an amphibious air cushion aircraft.
Nonlinear stochastic estimation of altitude and vertical flight speed in real time
Authors: Kharkov V P , Korsun O N , Pravidlo M N , Htang Om Moung 
Published: January 2021

Abstract
The optimal algorithm for calculating the altitude and vertical flight speed of an aircraft, which is based on complex processing of information from static pressure sensors, outdoor air temperature, and vertical acceleration is described. Information processing is performed using nonlinear estimation methods. Adaptive properties of the estimation algorithm are achieved by including into the state vector the parameters that characterize the properties of sensors and static pressure transmission paths.
Hierarchy analysis for monitoring the uniformity of measurements system
Authors: Krasavin I V , Yashin A V , Tulekbaeva A K 
Published: January 2021

Abstract
An approach to monitoring the state of the system for ensuring the uniformity of measurements and forecasting its state, based on the method of hierarchy analysis, is proposed. A decomposition of the system for ensuring the uniformity of measurements is proposed, the further processing of the judgments sequence for decision-making based on paired comparisons, is discussed. The processing of experts judgments in order to obtain a generalized judgment is described.
Improving the quality of FDM 3D printing of UAV and aircraft parts and assemblies by parametric software changes
Authors: Zagidullin R S , Zezin N I , Rodionov N V 
Published: January 2021

Abstract
The article analyses and presents the classification of defects in parts obtained by FDM 3D printing technology. A fault tree has been built for the functional and structural analysis of the factors causing defects in parts produced by FDM 3D printing technology. Using the constructed fault tree, a method is proposed for eliminating defects in parts obtained by FDM 3D printing technology, based on parametric changes in software.
In vivo organized neovascularization induced by 3D bioprinted endothelial-derived extracellular vesicles
Authors: Maiullari Fabio , Chirivì Maila , Costantini Marco , Ferretti Anna Maria , Recchia Sandro , Maiullari Silvia , Milan Marika , Presutti Dario , Pace Valentina , Raspa Marcello , Scavizzi Ferdinando , Massetti Massimo , Petrella Lella , Fanelli Mara , Rizzi Marta , Fortunato Orazio , Moretti Fabiola , Caradonna Eugenio , Bearzi Claudia , Rizzi Roberto 
Published: January 2021

Abstract
Extracellular vesicles (EVs) have become a key tool in the biotechnological landscape due to their well-documented ability to mediate intercellular communication. This feature has been explored and is under constant investigation by researchers, who have demonstrated the important role of EVs in several research fields ranging from oncology to immunology and diagnostics to regenerative medicine. Unfortunately, there are still some limitations to overcome before clinical application, including the inability to confine the EVs to strategically defined sites of interest to avoid side effects. In this study, for the first time, EV application is supported by 3D bioprinting technology to develop a new strategy for applying the angiogenic cargo of human umbilical vein endothelial cell-derived EVs in regenerative medicine. EVs, derived from human endothelial cells and grown under different stressed conditions, were collected and used as bioadditives for the formulation of advanced bioinks. After in vivo subcutaneous implantation, we demonstrated that the bioprinted 3D structures, loaded with EVs, supported the formation of a new functional vasculature in situ, consisting of blood-perfused microvessels recapitulating the printed pattern. The results obtained in this study favour the development of new therapeutic approaches for critical clinical conditions, such as the need for prompt revascularization of ischaemic tissues, which represent the fundamental substrate for advanced regenerative medicine applications.
Prediction of coefficient of friction for different surface topography in mixed-EHL regime
Authors: Prajapati Deepak K 
Published: January 2021

Abstract
The operation of concentrated contacts observed in gearboxes, rolling element bearings, and cams/followers of valve etc of several machinery and mechanical systems in the mixed-elastohydrodynamic lubrication (mixed-EHL) regime is one of the key reasons for occurring the incident of surface contact fatigue. Due to significant asperity interactions in the mixed-EHL regime, the friction coefficient is profoundly affected by the surface topography of mating bodies. Thus, exploration of role of surface topography on coefficient of friction in mixed-EHL regime is a vital issue. This work proposed a model for investigating the effect of different surface topography on the coefficient of friction of concentrated contacts under mixed-EHL regime. The results achieved with the proposed mixed-EHL model are validated by performing rolling/sliding experiments. A good match is found between experimental and predicted coefficient of friction. Based on the investigation, it is also concluded that a surface with small fraction of summits can operate in boundary lubrication regime at high-load and low-speed conditions. A surface with lower correlation length exhibit elastic-plastic deformation at higher coefficient of friction. High value of friction coefficient is observed for rough surface (S
q
> 0.5 μm) at even higher rolling speed (1 m s−1).
Corrosion behaviour of nanocrystallines alloy 690 at high-temperature and high-pressure in simulated PWR secondary environment
Authors: Li Xiaoxian , Liu Jiang , Liu Junbiao , Zhu Shengjian , Yan Yangxian , Zhang Xuehui , Liang Tongxiang 
Published: January 2021

Abstract
The influence of ultrasonic surface rolling treatment (USRT) on the corrosion behaviour of nanocrystallines (NC) alloy 690 at high temperature and high pressure in simulated PWR secondary environment was performed by using Raman spectrometer, X-ray photoelectron spectrometer (XPS) and scanning electron microscopy (SEM). After USRT, the average size and the thickness of NC surface layer could reach 55 nm and 1 μm, respectively. Electrochemical measurements showed that the oxide film on the surface of NC alloy 690 was denser and more complete compared with coarse grained (CG) samples. The corrosion tests in ethanolamine (ETA) solution illustrated that the fine oxide particles were evenly distributed on the oxide film of NC alloy 690. The corrosion potential increased from −364 mV to −229 mV, while the corrosion current density dropped from 18.07 × 10−8 mm2 A cm−2 to 8.842 × 10−8 mm2 A cm−2 after USRT. By analysis, the inner layer of oxide film consisted of Cr2O3, NiFe2O4, and FeCr2O4, while Ni hydroxides formed the major part of the outermost layer of film. A growth model of oxide films on alloy 690 at high-temperature and high-pressure in stimulated PWR secondary environments was proposed and discussed.
Highly efficient photoluminescence of 2D perovskites enabled by dimensional increasing
Authors: Ma Linlin , Wang Chao , Chu Ya , Guo Yurong , Feng Xia , Yu Zhenyi , Zhang Haoyue , Zhao Guangjiu 
Published: January 2021

Abstract
Herein, we proposed a dimension-increasing regulation strategy to realize the dimensionality engineering of perovskite from two-dimensional (2D) nanoplates (NPs) to quasi-two-dimensional (Q-2D) nanocrystals (NCs), and successfully prepared 2D (PEA)2PbBr4 NPs (PEA (phenylethylammonium) = C8H9NH3), Q-2D (PEA)2CsPb2Br7 (1) and (PEA)2Cs2Pb3Br10 (2) NCs. The photoluminescence dynamics changes from 2D (PEA)2PbBr4 NPs to Q-2D (1), (2) NCs by performing the time-resolved nanosecond transient absorption (NTAS) measurement for our perovskites. Compared with 2D (PEA)2PbBr4 NPs, we discovered for the first time that the electronic spectral redshift is intrinsic property of Q-2D NCs, which is caused by excitons transition to higher dimensionality. And the photoluminescence quantum yields (PLQYs) of Q-2D (1), (2) NCs is effectively increased from 8.780% to 14.72%, 21.80%, respectively. This directly verifies that Q-2D (1) and (2) NCs have enhanced their interlayer energy transfer capabilities. Moreover, the photoluminescence mechanism of these perovskites is investigated by the NTAS and the time-resolved photoluminescence (TR-PL) spectroscopy. The photophysical process of Q-2D samples exhibits a highly efficient and single photoluminescence pathway. The photoluminescence comes from the radiation recombination of free excitons. The Q-2D samples also have excellent photostability and decay lifetime stability. Our findings advance the research of improving 2D perovskites photoluminescence, and highlight potential of Q-2D NCs for optoelectronic applications.
Corrosion resistance and high temperature wear behavior of carbide-enhanced austenite-based surfacing layer prepared by twin-wire indirect arc welding
Authors: An Qi , Wen Yuxian , Matsuda Kenji , Xu Junyong , Wu Dongting , Zou Yong 
Published: January 2021

Abstract
Twin-wire indirect arc welding is a novel welding process. In this article, the anode wire was an austenite-based welding wire, and the cathode wire was an iron-based wear-resistant welding wire. Given that the two wires burn simultaneously in twin-wire indirect arc welding, a carbide-enhanced austenite-based surface layer was produced. The high-temperature wear resistance of the austenitic stainless steel was enhanced by the carbides. Results indicated enhancements in amount of reinforcing phase in the austenite-based surface layer with increasing of cathode wire feeding speed and the high-temperature friction coefficient decreased first and then increased. However, the corrosion resistance of austenite-based surfacing layer decreased slightly with increasing of amount of reinforcing phase. At low content of the reinforcing phase in the surface layer, the high-temperature wear behavior was dominated by oxidative adhesive wear, which changed to abrasive wear with the increase in the reinforcing phase.
Effect of Al–Nb–B2O3–CuO system reaction products on microstructure and wear resistance of A356 alloy
Authors: Jiachen Jiang , Huimin Liu , Hu Qilong , Zheng Chong , Qiao Zhenxing 
Published: January 2021

Abstract
The aim of present work is study the effcet of Al-Nb-B2O3-CuO system reaction products on microstructure and properties of A356 alloy. B2O3 powder, Al powder, CuO powder and Nb powder were used as raw materials to form Al–Nb–B2O3–CuO reaction system, and A356 alloy was refined by in situ reaction and near-liquidus casting. The size, phase, morphology and distribution of in situ reaction products were observed and analysed by optical microscope, x-ray diffractometer, scanning electron microscope and transmission electron microscope. The products of the Al–Nb–B2O3–CuO reaction system are mainly Al3Nb, NbB2 and Al2O3. The ratio of the prefabricated block is 8:1:1:2 . When the prefabricated block was added at 2.5 wt%, the particle size of NbB2, Al3Nb and Al2O3 is 0.5–1 μm. The microstructure of A356 alloy is fine and uniform. The average grain size is refined to less than 20 μm. Compared with untreated A356 alloy, the wear rate is reduced from 2.091% to 0.882%, and the average hardness of the alloy is increased from 41.3HRC to 58.2HRC.
Preparation of high molecular weight thermoplastic bio-based phenolic resin and fiber based on lignin liquefaction
Authors: Ren Yu , Lin Xu , Wang Wenlin , Shi Zhengjun , Zheng Zhifeng , Liu Can 
Published: January 2021

Abstract
In order to improve the application range of lignin phenolic resin, lignin thermoplastic phenolic resin was prepared by controlling the molar ratio (formaldehyde: phenol) with liquefied lignin, phenol and formaldehyde as raw materials, and thermoplastic phenolic fiber was obtained by melt spinning. The effects of different curing bath acid proportion (40%, 50%, 60%) on the mechanical property, thermal property and morphology of the fiber were investigated, and the curing behavior of lignin phenolic fiber was studied. The structure and properties of the resin and fiber were characterized by FT-IR, NMR, GPC, TG, DSC, XRD, SEM and fiber strength testing. The results showed that when the molar ratio was 0.7:1, the resin had the best performance, the O/P value was 1.75, Mw was 8298, and PDI was 2.92. After curing, the fiber continued cross-linking reaction, and the diameter of the cured fiber was thicker than that of the original fiber. The most suitable curing process for the original fiber was that formaldehyde and hydrochloric acid were prepared into curing bath according to the mass ratio of 1:1, the heating rate was 20 ℃ h−1, the curing termination temperature was 170 ℃. The tensile strength of the fibers reached 176.64 MPa and the elongation at break was 1.48%, and finally the carbon yield at 800 ℃ was 37.2%.
Research on dynamic mechanical behavior and damage evolution mechanism of Cu/WCp laminated composites
Authors: Yubo Zhang , Rongxin Guo , Haiting Xia , Feng Yan , Xing Yao Liu 
Published: January 2021

Abstract
In this paper, the effect of WCp particle content (3 and 15 vol.%) and laminate orientation on the mechanical behavior of laminated Cu/WCp/15p and Cu/WCp/3p composites under dynamic impact was investigated using the split Hopkinson pressure bar (SHPB) test. Subsequently, the micro-damage evolution mechanism of the composites was observed by scanning electron microscopy (SEM) and optical microscopy. The results demonstrated that Cu/WCp composites are strain-rate-sensitive, and a significant reinforcing effect of WCp particle content on composite properties was observed. Furthermore, the gradient direction revealed a remarkable effect on the dynamic compressive behavior of functionally gradient materials (FGMs). Microscopic analysis revealed that under the same strain rate, there were no apparent damage characteristics in Cu/WCp/3p, while obvious shear cracks appeared in Cu/WCp/15p. SEM analysis revealed that, in FGM, when the laminate orientation was parallel to the stress wave propagation direction, cracks initiated from one side of Cu/WCp/15p, and then grew through the interface to the other side. A relatively large sliding dislocation was observed at the interlayer interface, and the crack arrested at the Cu/WCp/3p layer. However, although the cracks in FGM also initiated from the side of Cu/WCp/15p, they did not cross the interface, but caused a direct split in the interlayer interface, when the laminate orientation was perpendicular to the stress wave propagation direction.
Constitutive models and microstructure evolution of Ti-6Al-4V alloy during the hot compressive process
Authors: Huang Xiaomin , Zang Yong , Guan Ben 
Published: January 2021

Abstract
Using the Gleeble-1500D thermal simulation machine, and the Ti-6Al-4V titanium alloy was subjected to isothermal compression test under the conditions of deformation temperature of 1023 K–1323 K, strain rate of 0.01 s−1–10 s−1 and maximum deformation degree of 60% (the true strain is 0.916), and the stress and strain data under different deformation conditions were obtained. Based on the stress and strain data, the Arrhenius model and Back-Propagation Artificial Neural Network (BP-ANN) model were obtained. The results show that the BP-ANN model has higher accuracy than Arrhenius model, its correlation coefficient is as high as 0.99959, and the average absolute relative error is only 3.0935%. The Ti-6Al-4V titanium alloy model can make up for the lack of prediction accuracy of the constitutive model, and can predict the flow stress in all deformation ranges. Finally, the influence of different deformation temperature, deformation rate and deformation amount on microstructure is analyzed.
Study of the precipitation, nucleation, and grain growth of phases in the ZL201 cast aluminum alloy by integrated calculations
Authors: Shen Jian-Ran , Chen Jun-Yu , Qiu Zhe-Sheng , Li Jia-Qi , Yan Ji-Kang 
Published: January 2021

Abstract
The purpose of this study is to investigate the influence of alloy composition on the evolvement rule of microstructure for ZL201 cast aluminium alloy. The ZL201 casting samples with different components were prepared by gravity diecasting process, the phase composition was characterized and calculated by x-ray diffraction (XRD) and thermo-calc (TC) software respectively, the evolvement rule of microstructures was observed by metallographic microscope (OM) and scanning electron microscope (SEM), and simulated by ProCAST software. The results show that the Al2Cu (θ) formed by Cu and Al matrix, which increased the free energy and reduced the precipitation temperature for the alloy system. For the microstructure of ZL201, the nucleation direction of Al-Cu was along the positive direction of z-axis, the morphology was a regular ribbed morphology; Al-Mn and Al-Ti were along the negative directions of x- and y-axis and morphologies were columnar. Besides, the nucleation mode of casting center was dominated by the growth pattern of Al-Cu, and that of casting surface was dominated by Al-Ti and Al-Mn.