bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discourses and practices of the ‘New Normal’
Authors: Krzyżanowski Michał , Wodak Ruth , Bradby Hannah , Gardell Mattias , Kallis Aristotle , Krzyżanowska Natalia , Mudde Cas , Rydgren Jens 
Published: July 2023

AbstractThis position paper argues for an interdisciplinary agenda relating crises to on-going processes of normalization of anti- and post-democratic action. We call for exploring theoretically and empirically the ‘new normal’ logic introduced into public imagination on the back of various crises, including the recent ‘Refugee Crisis’ in Europe, COVID-19 pandemic, or the still ongoing Russian invasion of Ukraine. Gathering researchers of populism, extremism, discrimination, and other formats of anti- and post-democratic action, we propose investigating how, why, and under which conditions, discourses and practices underlying normalization processes re-emerge to challenge the liberal democratic order. We argue exploring the multiple variants of ‘the new normal’ related to crises, historically and more recently. We are interested in how and why these open pathways for politics of exclusion, inequality, xenophobia and other patterns of anti- and post-democratic action while deepening polarization and radicalization of society as well as propelling far-right politics and ideologies.
Multi-photon annihilation in the negatively charged positronium ion
Authors: Frolov Alexei M 
Published: July 2023

Abstract
The total energy and other bound state properties of the ground (bound) 11
S-state in the Ps− (or e
−
e
+
e
−) ion are determined to very high accuracy. Our best variational energy for the ground state in this ion equals E=-0.26200507023298010777040225 a. u. , which is the lowest variational energy ever obtained for this ion. By using our highly wave functions we evaluated (to very high accuracy) a large number of different expectation values (or properties) of the Ps− ion which have never been considered in earlier studies. This includes a number of

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expectation values (where 5 ≤ k ≤ 11), all independent quasi-singular

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r

ij

r

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r

ij

3

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and singular

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1

r

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3

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expectation values, etc. Our highly accurate expectation values of the electron-positron delta-function of the Ps− ion are used to evaluate (to very high accuracy) the rates of two-, three-, four- and five-photon annihilation. The numerical values of these rates provide the highly accurate and complete solution of the multi-photon annihilation in the negatively charged positronium ion.
Ab-initio simulations of Rb2CuMCl6 (M = Sb, Bi) for photovoltaics and thermoelectric device applications
Authors: Khan M Aslam , Niaz Shanawer , Noor N A , Mumtaz Sohail , Mahmood Asif 
Published: July 2023

Abstract
Due to their extraordinarily flexible optoelectronic properties, the research on non-toxic double-perovskite halides has recently become very attractive. We use density functional theory to analyze the optical, electronic, and thermoelectric characteristics of copper-based double-perovskite halides, Rb2CuMCl6 (M = Sb, Bi). The band structures obtained with the Tran-Blaha altered Becke-Johnson potential demonstrate that altering the cations from Sb to Bi results in bandgap adjustments from infrared to visible (i.e. 1.0–1.2 eV) energy. Because of replacing Sb with Bi, the optical absorption exhibits utmost absorption within the ultraviolet region, whereas the absorption edge is shifted from infrared to the visible light region. Furthermore, the transport parameters are compatible with other estimated thermoelectric parameters. The fact that Rb2CuSbCl6 has a higher Seebeck coefficient indicates that a narrower band gap is appropriate for thermoelectric applications compared with Rb2CuBiCl6. In general, the Rb2CuMCl6 (M = Sb, Bi) is suitable for Sun-absorption devices and energy conversion, according to this computational thermoelectric and optical study.
A virtual flow meter downstream of various elbow configurations
Authors: Weissenbrunner A , Ekat A , Straka M , Schmelter S 
Published: July 2023

Abstract
When flow meters are installed in disturbed flow conditions caused by pipe configurations such as junctions or elbows, significant measurement errors can occur. With existing knowledge of the flow conditions, those errors can be corrected using suitable calibration factors. This paper presents a surrogate model based on computational fluid dynamics simulation results that can predict velocity profiles downstream of single and double elbows in- and out-of-plane. The simulated flow profiles are decomposed into a fully-developed and a disturbed part, which allows changing the Reynolds number and roughness of the pipe wall without performing additional simulations. Furthermore, proper orthogonal decomposition and interpolation using piecewise linear splines enables the real-time evaluation of the model for a wide range of curvature radii and distances between the elbows. By incorporating a measurement principle, calibration factors for different flow meter designs can be predicted. The model is validated on the example of an ultrasonic flow meter by comparison with measurement data obtained from a clamp-on flow meter.
Numerical studies on aerodynamic performance of NACA 0018 profile in fundamental and research application of the aerospace industry
Authors: Apostol E I , Ţîţu A M 
Published: July 2023

Abstract
For a good functioning of the activities carried out within research institutions both at managerial level and for fulfilling the technical requirements, we aim to determine the aerodynamic characteristics of the standard profiles used in the aerospace field by testing in the subsonic tunnel. We also intend to conduct a study based on numerous experimental tests performed in wind tunnels that can be compared to the actual scale of the aircraft for structural integrity and improving its performance. The purpose of this paper is to evaluate the dynamics of fluid separation, lift and drag. This allows us to further improve the profiles so that it is essential to improve the efficiency and performance of an aircraft in terms of improving lift and reducing drag. In the present research, numerical and experimental studies are performed on a finite geometry of the NACA0018 wing at different angles of attack and Reynolds numbers. This paper aims to improve the performance, accuracy and quality of testing, increase the competitiveness of similar installations on the world market, ensure the national research and development capacity of new products in the aeronautical and defense industry.
The mathematics approaches in the analysis of mathematics syllabuses similarities among Japanese and Bosnia and Herzegovina universities
Authors: Milijevic M , Preradovic Kulovac D 
Published: July 2023

Abstract
The goal of our research is improvement of mathematics curriculum and popularization of mathematics among students of economics in developing countries. We analyze and compare curricula of pure mathematics courses that are taught to university students of faculties of economics in Japan and in Bosnia and Herzegovina. Data set contains math syllabuses in 2021/22 school year from six public universities in Bosnia and Herzegovina and seven from Japan. The text corpus was pre-processed and then the Term Frequency – Inverse Document Frequency algorithm, and Sentence Transformed Multi QA model were applied to build word vectors, find the similarity among Japanese and Bosnia and Herzegovina mathematics syllabuses using cosine similarity approach, and to find the key competences of these two countries mathematics syllabuses using the word cloud. Our results show the following similarity between the curricula: 60.7 percent using TF-IDF and 80.3 percent using Multi QA model. The key competences in the Japanese mathematics course are narrow and focused, in contrast to Bosnia and Herzegovina’s.
Computer aided design of low voltage electrical installations
Authors: Predus M F , Muscai C M , Popescu C , Hatiegan C 
Published: July 2023

Abstract
The paper proposes a method of calculation and rapid sizing of power circuits of electrical panels using a program made in-house. The proposed application has a friendly and very intuitive graphical interface, being easy to use due to the intelligent way of making the selection and data entry. This application emerged in response to the real need for fast and accurate sizing of low voltage electrical switchboards used in industry. The real help is provided by the mechanism that allows frequent and rapid modification of the technical solution to adapt to the ever-changing requirements dictated by the stages in the development of electrical projects.The operation of the program is based on the existence of an internal database materialized using several data tables containing various types of electrical consumers, switching and protection equipment and a series of standardized power cables from which they are automatically selected. The selection is made based on sizing and verification calculations with the help of intelligent selection methods so that only the equipment that matches the data provided by the user are selected ensuring an additional verification of the various omissions that may occur.The application is useful for designing of a new installation or for the verification of existing ones, allowing the rapid and even real-time observation of the influence of the various changes made to the project.
PyDigitizer – A Python module for digitizing 2D curves
Authors: Nedelcu D , Latinovic T , Sikman L 
Published: July 2023

Abstract
The paper presents a PyDigitizer application designed to extract numerical coordinates of existing curves from image format. The application is created in the Python programming language and offers the possibility of manual extraction of curve coordinates, intersection of curves with user-specified abscissa or ordinate, generation of polynomial regression equations of curves. All generated information (coordinates, intersection points, regression curves) can be exported to Microsoft Excel. Also, point coordinates of Excel curves can be loaded into PyDigitizer to obtain polynomial regression curves or intersections.
Romania in the energy transition, for small prosumers - post pandemic and the Ukraine war
Authors: Blaj M A , Deaconu S I 
Published: July 2023

Abstract
Prior to the COVID 19 pandemic, Romania demonstrated enormous progress in the context of sustainable electricity production from renewable sources. Mainly motivated by easy access to the electricity exchange for these new producers and the appetite of the younger generation for clean energy. However, outside all development and improvements on the production side, and added new production capacity, the distribution and quality of the electricity supplied to end customers kept deteriorating. Small consumers, both private and industrial, must bear all the disturbances caused by the ageing distribution installations. For such situations, the solution came in the form of micro-grids and expansion of new electricity generation capabilities at local level, more adapted to consumers. This paper follows up on two previously introduced practical examples with such solutions, with new advantages and disadvantages, from, both, a technological and commercial perspective.
Tribological aspects of nano-particle fluid based cooling and lubrication in milling process
Authors: Sredanovic B , Globocki-Lakic G , Dugic P , Borkovic A 
Published: July 2023

Abstract
The introduction of different additives into the cooling and lubrication systems in the metal cutting process, contributed to improving the machining process sustainability. Different types of additives can help to reduce friction, reduce wear of contact surfaces, improve heat dissipation from the cutting zone, etc. With the development of nanotechnology, great focus has been placed on the investigation and using of nano-particles, nano-additives and nanofluids in industry. In this paper, the effects of using the nano-particle based cooling and lubrication fluid are investigated. There are performed comparison effects of standard cooling and lubrication fluids versus nanofluids based cooling and lubrication on cutting process performance. Molybdenum disulphide particles are used as nano-particles, which dispersed in a standard cooling and lubrication fluid. As workpiece was used alloyed tool steel. Milling process performance indicators was analysed based on Taguchi experimental plan, for different cooling and lubrication condition and process parameters. Cutting forces component in three perpendicular axes, and machined surface parameters were measured. Experimental analysis has shown that the use of nano-particles, which mixed in a standard cooling and lubrication fluid, significantly contributes to the reduction of cutting forces, friction coefficients, more efficient cutting and generation of machined surfaces.
Measurement of thermal conductivity of the cortical bone: experimental studies and comparative analysis
Authors: Zawadzki P , Patalas A , Labudzki R , Talar R 
Published: July 2023

Abstract
Thermal conductivity is an ambiguous material property of bone tissue that directly impacts the surgical procedure and the patient’s convalescence (thermal necrosis). The study aimed to determine the thermal coefficient experimentally and compare the results with previous results. The comparative method was used with the reference material, PMMA, with a coefficient value of 0.167 W*(mK)−1 to measure the thermal conductivity. Thanks to the obtained results, the thermal diffusivity coefficient was also determined. The results allowed to choose the coefficient of thermal conductivity at the level: 0.26-0.34 W*(mK)−1 and thermal diffusivity: 0.103-0.135 mm2*s−1. The confrontation of the results established their compliance with the latest research. The thermal conductivity coefficient varies depending on the condition of the tissue (dry or fresh) and its porosity. Due to its anisotropic structure, bone tissue can change its thermal properties depending on its location (body or head). Further extensive experimental evaluation of these properties is required.
The dependance of breakage energy on the grain size for selected biomaterials
Authors: Kruszelnicka W 
Published: July 2023

Abstract
The aim of this research is to expand the knowledge on the description of the grains breakage energy. In effect of the research a model to describe the rice and corn grains breakage energy in dependance of size was developed. This was achieved by linking the level of grinding energy with the properties of the material (particle size) and the loading conditions. The selected grains (rice and corn) were subjected to loads (compression and cutting) on a testing machine. Based on the force-displacement curves, the relationship between the energy necessary to cause a breakage and particle size was described. The results show, that the energy needed for grain shearing changes with the particle size according to the power law, similarly to brittle materials. Through proposed modeling approach, it will be possible to reduce undesirable grain damage as well as improve the operation and design of processing machines in terms of their energy consumption and efficiency.
Radiographic film waste management and recovery
Authors: Ardelean E , Ardelean M , Galfi C , Socalici A , Josan A 
Published: July 2023

Abstract
Health facilities in Romania generate hundreds of thousands of tons of medical waste (hazardous and non-hazardous) annually. It is therefore necessary to apply a rigorous management of this waste, in compliance with applicable regulations, especially in the case of waste with a high potential for harmfulness. In the context of the global PANDEMIC of COVID 19, the amount of radiographic films generated has increased, using the classic variant when the moderns investigative devices was no longer available. The legislation requires hospitals and clinics to follow certain rules regarding the management of X-rays films. These are considered private information and must be managed according to the legislation, but silver and other chemicals in the film are toxic to the environment when are disposed uncontrolled. Recycling companies prefer to recover silver from effluents used to obtain classical radiography, recovery that is done by electrolysis and does not require large investments.
The paper presents a relatively simple technology of recycling the radiographic films starting from laboratory studies, by leaching them in sodium hydroxide solution and the implications from the point of view of managing such activities.
Structural design of architectural 3D printing equipment
Authors: Wu Liang , Wu Changzhong , Tian Jiaxin 
Published: July 2023

Abstract
Referring to the development status of building 3D printing equipment at home and abroad, this paper compares various schemes, and designs and analyzes the performance parameters of the mechanical system and various mechanisms of building 3D printing equipment. The detailed design scheme of each component is present and provides a reference for the development of 3D printing equipment for large buildings in the future.
The Bearing Capacity of Composite Insulated Cross Arm Tower under Typhoon Load
Authors: Zhu Binrong , Zhang Hongjie , Sun Qigang , He Chunhui , Xing Haijun 
Published: July 2023

Abstract
Typhoon meteorological disasters occur frequently, which seriously threaten the safe and stable operation of old transmission lines. The old transmission towers can be retrofitted with composite insulated cross arms to solve the problems of low capacity of wind protection design and insufficient distance between conductor and ground. The paper analyzes the wind load and bearing capacity of composite insulated cross-arm towers under the action of a typhoon through theoretical calculation and finite element analysis and puts forward the calculation method of wind load under the action of a typhoon, and it is revealed that typhoon has less influence on the force of composite cross arm and greater influence on the deformation of the composite cross-arm. Finally, the bearing capacity of a composite insulated cross-arm tower under typhoon load is proposed.
Heating Simulation Analysis of Lubrication System at Low Temperature
Authors: Zhang Tao , Zhou Wei , Zhao Ning , Cui Huasheng , Gao Zepeng 
Published: July 2023

Abstract
In this paper, star-ccm+ software is applied to simulate the thermal melting of engine oil under low-temperature conditions, and corresponding models are established based on the physical parameters of the fuel tank, antifreeze, lubricating oil, and heating pipe. Single-phase multi-working medium simulation and VOF (volume of fluid) multi-flow simulation were used to model and analyze the various characteristics of the lubricating oil from solidified state to liquid state under the specific box and heating pipe structure. The results showed that the simulation results of the VOF multiphase flow model under the proposed lubrication system were basically consistent with that of the single-phase multi-working medium model. The simulation efficiency could be improved by using the single-phase multi-working medium model. The simulation results of heating melting can provide a reference for the subsequent design and optimization of the heating pipeline.
Laser Cutting Thermal Error Prediction Method Based on Multivariate Segmentation
Authors: Lu Chang , Fei Jiyou , Zhao Xing , Shao Xiongfei 
Published: July 2023

Abstract
With the increasing accuracy of manufacturing processing, laser cutting has become one of the best ways to cut thin-walled parts. A multivariate segmented thermal error prediction method is proposed for thermal errors in laser cutting. Based on actual processing data, we analyzed the thermal expansion of the material during the cutting process. Modeling simulation and heat deformation prediction are performed. W18Cr4V material was used as the study object for computational verification. The results show that multiple-segmented regression can achieve data accuracy of more than 90.4%. For the maximum deformation predicted value error rate is less than 10.35%, and the average deformation error rate is less than 10.74%.
Crack propagation life of high-speed aviation gear
Authors: Lu Xiqiang , Lin Tengjiao , Chen Bingkui 
Published: July 2023

Abstract
The most common fault in aviation power transmission systems is the fatigue fracture of gears, which seriously affects the reliability and safety of the structure. The aim of this study is to analyze the crack propagation path (CPP) to predict the crack propagation life (CPL) of gears. The location of crack initiation is determined by statics analysis and building a gear pair model in ANSYS software. A FEM model of the gear pair with a crack is created, the Stress Intensity Factor (SIF) at the crack tip is calculated, and the influence of the initial state of the crack on the SIF is analyzed. FRANC3D is adopted to obtain the CPP and CPL. Based on the obtained results, the impact of gear structure parameters on CPL is discussed. With the reduction of flange thickness, web thickness, and root radius, the CPL gradually decreases.
The influence of electron beam welding technology on mechanical properties of GH4169 welded joints
Authors: Yang Sihui , Liu Zhicheng , Zhang Yong , Long Xiangyun 
Published: July 2023

Abstract
Super-alloy GH4169 and related welded structures were widely used in the aero-engine industry region. Vacuum electron beam welding is one of the most advanced welding technologies, and the influence of the mechanical property caused by the welding technology still needs further research. Firstly, the hardness, microstructure, and tensile properties of the GH4169 electron beam welded joint were tested. After electron beam welding and two-stage aging treatment, the weld zone was strengthened and its hardness is higher than that of the base metal zone. The microstructure characterization results showed that the grain size of the weld and heat-affected zone was larger than that of the base metal. The tensile results show that the static properties of the welded joint are similar to that of the base metal, and the residual height has no obvious effect on the static strength of the welded joint. The high-temperature creep properties of GH4169 electron beam welded joints with residual height were tested. The results show that residual height will lead to a transient fracture of welded joints under relatively safe service conditions. The fatigue performance of GH4169 welded joints with and without residual height was tested respectively. The results show that the fatigue life of the welded joints without residual height was about 10 times longer than that of the welded joints with residual height under the same stress level, and for the welded joint with residual height, the residual height position will become the main fatigue crack source.