bluuebunny/crossref_metadata_2025_split huggingface dataset:
Short-and long-term factors of Kuzbass resilience (based on expert interviews)
Authors: Matveeva E V , Goosen E V , Nikitenko S M , Kavkaeva O N 
Published: August 2021

Abstract
Resource regions and their resistance to stress require a separate study. The article develops the author’s interpretation of the concept of stress resistance, identifies four main indicators of stress resistance-economic, social, political and psychological. The aim of the article was to identify indicators for assessing the stress resistance of a region, as well as the possibility of using this concept to analyze the current socio-economic and political situation in the context of the global crisis caused by the COVID-19 pandemic using the example of one of the resource regions-Kuzbass. The main research method was the expert interview method, which made it possible to find “common ground” in understanding the sustainability of the development of the region, as well as to see different facets of the manifestation of sustainable and unstable development on the example of Kuzbass, which are based on certain not only subjective, but also objective reasons, as well as to outline further facets of research. When analyzing crisis phenomena mainly in the economic sphere, the model of economic stress resistance by R. Martin, R. Sunley and others is used. The research was based on expert interviews among representatives of the scientific and expert communities of Kuzbass, representing the higher education system, regional media, business community, and non-profit organizations. During the study, 10 experts were interviewed. The study showed that the highest stress resistance is demonstrated by the sphere of medium and large business, there was practically no deterioration of the situation in the media sphere, education, healthcare (to a lesser extent sports and culture) managed to adapt to new conditions, but the “precariousness” and instability of the situation is most traced in the activities of the non-profit sector.
The model of a permanent magnet DC motor in time domain and frequency domain based on Bond Graph modelling and design of position control using PID controller
Authors: Korsoveczki Gy , Husi G 
Published: August 2021

Abstract
During the research work, the modelling of a permanent magnetic DC (PMDC) motor was realised in time domain and frequency domain via 4 different types of model construction. To achieve this, the Bond Graph model of the motor was determined, and based on them the system equations were defined in time domain firstly and then in frequency domain by using the Laplace transform. According to the system equations in time domain, the state-space model of the motor was also realised and implemented. Based on the system equations in frequency domain, the transfer function of the position control loop was realised. As the further part of the research work, PID control-based position control was designed in both time domain and frequency domain. The controller was tuned according to the Ziegler-Nichols method. Finally, the models were compared from the point of view of behaviour during the tuning process. The models were implemented in LabVIEW environment produced by the National Instruments.
Analysis of defects in the braking systems of commercial vehicles
Authors: Popa M F , Capătă D M S , Burnete N 
Published: August 2021

Abstract
The field of commercial vehicles has consolidated an indispensable place in society through aspects such as: the continuous development of delivered performance, increased reliability, raising comfort standards and increasing traffic safety to unprecedented levels. However, increasing performance and improving the braking process are aspects that require increased attention and can be achieved by timely identification of system defects and analysis of determinants. The complexity of current systems, both the complexity of braking systems and the overall complexity of commercial vehicles, sometimes make it difficult to diagnose and repair, but they come with significant advantages. The current study analyses data on the wear of the elements of the braking system at several trucks and identifies the main trends. In addition to data on wear and maintenance, this study also examines errors in electronic control units, looking to identify dangerous situations that can lead to issues such as: reduced braking capacity; premature decommissioning of the elements in the braking system; increasing downtime in the workshop or increasing maintenance costs. The identified solutions are based on the analysis of the frequency of errors and their distribution.
An analysis of European Union’s circular economy indicators with focus on materials: implications for the manufacturing industry
Authors: Păcurariu R L , Lakatos E S , Nan L M , Bacali L , Seitoar D 
Published: August 2021

Abstract
The paper aims to emphasize the contribution that manufacturing industry can have to meet the Circular Economy (CE) scope related to the use of resources. First, we presented the CE concept and the framework in Europe, the monitoring framework and also, we noted some aspects of manufacturing industry related to CE. Then, we performed an analysis of the secondary raw material data, which is one of the representative indicators of CE, in order to see the state of circular economy related to the resources in European Union Member States. The results showed that the resource circularity is lowest in Europe, the states which can be remarked are Germany, Netherlands, and Belgium. Highlighting these aspects, some conclusions were formulated, the most evident is that the manufacturing industry has a very important role on the CE transition, consisting in the resources fact implicated. The manufacturing industry can choose to use secondary raw materials instead of virgin raw materials, can improve resource efficiency through the technologies used in production processes and can address the circularity of a product, being an important CE actor.
Transforming 3D printed CNC prototype into a plotter
Authors: Culda LI , Muncut (Wisznovszky) ES , Erdodi GM 
Published: August 2021

Abstract
We often hear about numerical control or CNC abbreviated. With this type of control, we can automatically control various processing tools such as: drills, lathes, milling cutters, rapid prototyping printers, etc. The instructions they need to receive will be in the form of a Gcode sequential program generated by the CAD / CAM drawing and manufacturing program. In the case of 3D printers, the CAD / CAM information is passed through a slicer specific to that printer, which “cuts” the object into printing slices. CNC systems are used today for virtually any process that has movements and operations, including laser cutting, hole punching, fabric cutting, welding, etc. because most CNC systems built today are 100% electronic. 3D printing of a CNC was a real challenge that aimed to understand the principles of obtaining and operating a CNC. I found that we basically have 3 devices with the same basic principles: CNC milling cutter, 3D printer and plotter. So I created a CNC that I turned into a plotter just to highlight the above.
Financial performance management and economic cycle variations. Evidence for textile industry
Authors: Tudose M B , Avasilcai S 
Published: August 2021

Abstract
The study analyses the dynamics of the financial performance of the companies in the textile industry in Romania and aims to identify its main determinants, corresponding to the different stages of the economic cycles. The selected sample was mixed; therefore, the econometric analysis (based on panel data) was performed on accounting data collected from secondary sources (for 2000-2019). Because some of the companies in the sample showed negative financial results, the financial performance was assessed based on sales’ volume. The regression model used included seven determinants related to the company (internal determinants) and three external variables (GDP growth rate, inflation rate and unemployment rate). The results of the analyses indicated that (for the whole period) 51% of the sales dynamics can be explained due to the variation of the determinants included in the model. The analysis at the level of internal determinants indicated that all seven variables have a significant statistically influence on financial performance. From the perspective of macroeconomic determinants, the study showed that performance is negatively and significantly correlated with the inflation rate and unemployment rate. Applying the regression model to distinct periods (pre-crisis, crisis and post-crisis) provided very useful information from a practical point of view.
Productivity assessment of the Romanian construction industry using Malmquist Productivity Index
Authors: Cristea C , Cristea M , Șerban F M , Făgărășan C , Stoenoiu C E 
Published: August 2021

Abstract
The construction industry is one of the largest economic sectors worldwide. It is essential that the firms operating in the construction industry to evaluate accordingly their productivity change both in economic depression and when there is registered an expansion in the economy. This paper investigates the productivity changes of the Romanian enterprises from construction industry during the period of 2006 through 2019 by using the Malmquist Productivity Index. Four input variables and two output variables have been employed for measuring the change of construction productivity. The findings indicated that Malmquist Productivity Index can be effectively employed for assessing the productivity changes of companies. The results indicated that the majority of the Romanian companies exhibited better performance in terms of technical change while efficiency change regressed. This investigation provides valuable information for decision makers in order to enhance the performance of the Romanian construction industry organizations.
Insular genetic algorithm for operational management
Authors: Vîlcu A , Herghiligiu I , Verzea I , Pîslaru M 
Published: August 2021

Abstract
Problems in the operational management that involve the calculation on graphs are numerous, being encountered in many economic fields: transport problems, problems of resource allocation, logistics problems. Within these problems are found the problems of partitioning graphs with partitions that meet different partitioning criteria. The paper presents a case study for the problem of partitioning graphs - organizing the graph, practical applicability of the problem, partitioning function, method of solving the problem by using three genetic algorithms working individually on islands of problem solutions, changing synchronously with each other solutions, and the application of the algorithm on a numerical example. Finally, the paper proposes conclusions and future directions of development.
A comparative experimental study for dry and wet collisions
Authors: Ciornei F-C , Alaci S , Bulai P , Romanu I-C 
Published: August 2021

Abstract
The collision between polyurethane prismatic foam and a dropping steel ball is investigated experimentally. Because the foam presents large deformations, an analytical model is not available. The impact is studied on a test rig from laboratory, for dry foam and for the mineral oil wetted foam. The post impact velocity is found measuring the flight time and the coefficient of restitution and lost energy are estimated. For the dry impact case the damping effect is smaller than for the case of oil-wetted target.
Analysis of driver’s seat rigidity in the case of rear-end collisions using a virtual multibody model
Authors: Radu A I 
Published: August 2021

Abstract
The aim of the paper was to analyse the injury potential of the occupant in the case where the backrest of the seat had lower value than normal simulating a broken seat for a rear-end collision. The study was conducted using a virtual environment and a multibody model for the occupant. Two test scenarios were taken into account, a rear end collision at 50 km/h with the normal seat and the second where the seat had a lower rigidity value. The results of the simulation show that while the head acceleration values were similar, due to the “whiplash “phenomenon when the seat had a lower rigidity, the injury potential for the occupant was two times higher compared to the normal seat.
Kuka KR5 arc Welding Industrial Manipulator Workspace Modelling Based on Kinematics Study
Authors: Saadah A , Husi G 
Published: August 2021

Abstract
In this study Kuka KR5 arc industrial manipulator was study using Denavait Hartenberg (DH) parameters representation and homogeneous matrix in order to obtain the transformation matrix for six degree of freedom articulated robot using MATLAB. The workspace of Kuka robot can be deduce by computing the transformation matrix with each motor workspace range. finally, the study in this paper allows us to control the manipulator in order to achieve any wanted orientation and position.
Research of the influence of axial displacement on the wear of hob milling tools
Authors: Sovilj B , Sovilj-Nikić I , Sovilj-Nikić S , Blanuša V 
Published: August 2021

Abstract
The need to increase productivity and cost-effectiveness of gear cutting of cylindrical gears with oblique teeth creates favorable conditions for the development of research in the field of tribology and the increasing application of tribological knowledge in industrial practice. Improving the gear cutting process by hob milling is important and useful for both gear manufacturers and hob milling tools manufacturers. Increasing productivity and increasing of the quality of serration are the basic directions of improving the process of gear cutting by hob milling. Technological parameters significantly affect the wear of cutters and taking into account the parameters for defining the economy of the process affect the achievement of optimal parameters of the cutting regimes. Based on experimental research, the paper presents an analysis of the influence of axial displacement, as one of the technological parameters, on the wear of hob milling tools in the gear cutting of cylindrical gears with oblique teeth.
Research on the biomechanical behavior of dental implants
Authors: Rohan A , Baritz M 
Published: August 2021

Abstract
As shown in a large series of researches, dental implants are generally made of titanium because this material allows a stable and functional connection between the bone and the contact surface of the implant. From the point of view of the mechanical behavior of dental implants, it was found that too large or incorrectly directed forces developed in the mastication process can change these connections at the same time as affecting the osseointegration process, compromising the stability of the implant. That is why modelling the behavior of dental implants represents a pre-analysis solution to understand the effect of the correct development of the mastication process. In the first part of the paper a series of researches are presented and their results regarding the importance and effect of the dimensions of dental implants on their behavior. The second part of the paper presents the analysis scheme on dental implants and establishes the procedures for making the 3D model with convertible properties compared to the real implant. The third part of the paper mentions some aspects related to the design of the experimental installation and the design of dental implant testing procedures. The final part of the paper presents the observations and conclusions of this approach of developing a system for behavioral analysis of dental implants.
Stripping of plated plastic materials
Authors: Ilea S , Veres R 
Published: August 2021

Abstract
Many of the nowadays materials used in the large sectors of industry are resuming to the plastics. A first hand competitor of the metals, plastics are more and more suitable for many kind of applications due to their improved characteristics, being also more simple to process and also being more cost effective. Starting from automotive sector going through mass industry and finishing in the medical devices sectors, plastic have been proved as efficient materials, taking into account a more supple finishing without sacrificing the utility and endurance of it. In this paper we are presenting the stripping of the plating that can be done to refurbish plastic waste that may occur in the automotive industry.
Promoting the physical and the mechanical properties of concrete using nano and waste materials
Authors: Abdel Ghafaar Ahmed A. , Faried Ahmed S. , Mokhtar M. , Morsy M. , Osman Khaled M. 
Published: August 2021

Abstract
the industry of producing Portland cement concrete (PCC) depends on Portland cement (PC) as a major element. One of the main usages of the PCC is producing concrete members. The use of waste materials in concrete manufacture could be useful to improve the properties of concrete and reduce production costs by replacing the Cementous material with waste materials. Researchers had invested efforts in investigating the effect of using nanomaterials as an add-on to the concrete mixture on the mechanical properties of concrete. As a result, it was concluded that nanomaterials have a considerable impact on promoting the compressive and flexural strength of the PCC. This research illustrates the effect of utilizing nanomaterials, as an add-on to the concrete mixture, combined with using waste materials, as a replacement to PC, to improve the mechanical properties of plain concrete with different types of materials in different dosages. The experimental part has been carried out by using waste materials and nano-based material. The used waste materials were ceramic waste (CW), and marble powder (MP). The nano-based materials that were used were Carbon Nanotubes (CNTs) and Graphene oxide (GO). The results were compared in terms of compressive strength and flexure strength to the control concrete mix. These tests aim to investigate the impact of the modified mixtures on the mechanical properties after elapsing 7 and 28 days to obtain the maximum partial replacement percentage of cement with waste and nano-based materials. It could be concluded that using CW and MP combined with either CNTs or GO could be effectively utilized as a replacement of cement in PCC.
Magnetic field induced multichannel tunable filter properties of photonic band gap materials
Authors: Aly Arafa H , Awasthi Suneet K , Mohamed Asmaa M , Sabra Walied , Mobarak M , Matar Z.S. , Shalaby A S 
Published: August 2021

Abstractwe have explored the tunable multichannel characteristics of one-dimensional (1D) plasma photonic structure in presence of static magnetic field applied externally parallel and anti-parallel to the direction of propagation under normal incidence. We have theoretically examined the transmission characteristics of the binary photonic design consisting of alternate layers of CaF2and magnetic cold plasma layers by means of transfer matrix method (TMM) which is amongst the one of the popular techniques for simulating 1D multilayer periodic structures based on MATLAB. The proposed structure possessN-1number of distinct transmission peaks, each of unit transmission called as transmission channels in transmission spectra for given the number of periodsN> 1. In this study N varies from 2 to 6 in steps of 1 to get 1 to 5 transmission channels respectively. Further we have also investigated how these transmission channels can be repositioned inside PBG by applying the static magnetic field (B) externally under right hand polarization (RHP) and lift hand polarization (LHP) configurations for givenNat B = 0T, 0.02T, 0.04T and 0.06T. The reason behind the existence of these transmission channels is due to the superposition of evanescent and propagating waves inside plasma and dielectric layers respectively. The existence of these transmission channels inside PBG is different from the transmission bands which are formed due to the interference of forward and backward propagating waves. Besides this the tuning sense of the transmission channels at fixed B applied parallel or anti parallel to direction of periodicity, by changing the angle of incidence corresponding to TE and TM polarization case has also been examined to get some more useful and interesting tunable multichannel characteristics of the current design which cannot be obtained in conventional PPCs.
Hopping frequency and conductivity relaxation of promising chalcogenides: AC conductivity and dielectric relaxation approaches
Authors: Ojha Swarupa , Ali Mir Sahidul , Roy Madhab , Bhattacharya Sanjib 
Published: August 2021

Abstract
Ag2S doped chalcogenide glassy systems have been characterised on the basis of AC conductivity and electric modulus formalism. Various nanophases such as Ag2Se, Te0.5 Se3.5 etc. and dislocation (defects) have been identified and their roles in the conduction process have been established. XRD analysis provides that incorporation of more Ag2S content in the present system should play important role to enhance the dislocation and to decrease the crystallite sizes. The Fourier transform infrared spectra (FT-IR) confirm the characteristic vibration of Ag–S at 500–650 cm−1, stretching vibrations of the O–H bond near 3400 cm−1 and bending vibrations of the adsorbed H2O molecules on the surface of Ag2S near 1600 cm−1. Composition dependent optical phonon frequency (ν0) and Debye temperature (θ
D) have been estimated from FT-IR and it is noteworthy that θ
D increases with Ag2S content in the compositions up to x = 0.1, but decreases for x = 0.2. This result suggests higher kinetic energy of the constituent atoms/molecules, which may refer to higher electrical conductivity due to polaron hopping. Correlated barrier hopping (CBH) model in its modified version has been found most suitable model to explore the conduction mechanism. Short time relaxation process may be considered to be trivially associated with conduction of polaron. universal scaling approach proposed by Ghosh and Pan has been adopted to interpret electrical relaxation process from time-temperature superposition principle. AC conductivity spectra at various temperatures exhibit a perfect overlap into a single master curve. This feature must be an indication of the temperature independent relaxation process. On the other hand, conductivity spectra of all the compositions at a particular temperature do not exhibit perfect overlapping into a single master curve. This result indicates that the relaxation dynamics of charge carriers (polarons) is strongly dependent on compositions.
Evaluation of Perampanel in the Presence of its Degradation Products and Process-Related Impurities by Validated Stability-Indicating Reverse Phase High Performance Liquid Chromatography Method
Authors: Varghese Susheel John , Mohanakishore G , Ravi Thengungal Kochupappy 
Published: August 2021

Abstract
A novel stability-indicating isocratic reverse phase high-performance liquid chromatographic method was developed for the quantitative determination of perampanel in the presence of degradation products and its process-related impurities. Good resolution was achieved between the peaks corresponding to process-related impurities and degradation products from the analyte using Shim-pack GIST C18 column with mobile phase, potassium dihydrogen phosphate (pH 2.5; 30 mM)-acetonitrile (45: 55, v/v) at a wavelength of 294 nm. Perampanel and its impurities were well-separated within a run time of 7 min. To show the stability-indicating power of the method, forced degradation studies were performed on bulk samples of perampanel as per ICH prescribed stress condition using acid, base, hydrolytic, oxidative and photolytic degradation conditions. The degradation products were resolved from main peak and its impurities. The developed method was validated as per ICH guidelines with respect to specificity, linearity, limit of detection, limit of quantification, accuracy, precision and robustness. This method was also applied for assay and related substances determination of perampanel in bulk and pharmaceutical dosage form.