bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of laser cutting process efficiency
Authors: Girdu C C , Mihail L A , Dragoi M V 
Published: October 2019

Abstract
The efficiency of laser cutting processes is generally treated in technical literature in qualitative terms, referring to ways to increase it. The present paper is focussed on metal cutting by laser and proposes some quantitative means to estimate the process efficiency. For certain working conditions – machine-tool, material to be processed, specific costs and other – the effectiveness and the specific power consumption are computed based on the main cutting parameters: laser power and cutting speed. The proposed mathematical relationship can be successfully used when the criterion of process optimization is the environment friendliness. A relevant case study is presented, as well. When significant different samples are to be compared, the criterion used to evaluate laser cutting efficiency becomes very important.
Determination of operating parameters of turbines for micro hydroelectric power plants for optimal use of hydropower
Authors: Prodanovic M , Miltenović A , Nikodijević M 
Published: October 2019

Abstract
Energy trends have been mostly focused on renewable energy sources in recent years. In the world, about 20% of electricity is produced using energy of water flows, ie. hydropower with a total installed power of 720 GW. The production of hydroelectric power has a number of advantages from fossil fuels or nuclear energy and the greatest is that it does not pollute the environment. In mountainous areas, small and micro hydro power plants are often used, which can be installed on small rivers or streams with little or negligible impact on the environment. The choice of the type of turbine is influenced by a number of parameters, which should be determined before the complete project of the micro hydroelectric power plant. For turbines that are most commonly used in micro hydroelectric power plants, the process of determining operating parameters for optimal utilization of available hydro power is presented in the paper.
Determining of the drive power of a transport machine for disabled persons using a computational model
Authors: Blatnický M , Dižo J 
Published: October 2019

Abstract
The article deals with calculation of a stair lift drive and its design. The aim is the determining the necessary power of the used electric motor depending on the variable input values such as a passenger weight, a gradient of the seat lift etc. Calculating the required power for operation of the equipment is essential for selecting the optimal drive motor. In practice, the mathematical-physical principle of solving a problem such as drive calculation is often neglected. This results in the use of excessively powerful propulsion equipment, and thus in excessive financial cost in mass production. Consequently, by designing a drive-train, it will be possible to design the entire drive mechanism, i.e. motor, gearbox, gear module, etc. A significant part of the overall solution will be the design of the shaft for the drive pinion and its analytical dimensional calculation in comparison with the numerical solution. This will fulfil the prerequisites for optimizing the current shaft design by reducing its mass from the current value of 1.185 kg while the safety and reliability conditions of the construction are still met.
Technical solution of the under locomotives visual inspection system
Authors: Miltenovic A , Stamenković D , Banić M , Simonović M 
Published: October 2019

Abstract
In recent years, liberalisation of rail cargo operators market brought to the position of a number of small rail operators that are operating on rail infrastructure. Most of them are relatively small with specific cargo transport products, limited number of locomotives and wagons and with limited service resources. Independently of the cargo operator size, they are also obligated to have regular inspections according to the railway regulations. Inspections are frequent and in normal cases they need special depot with inspection pit that small operators do not possess. In the paper are given technical solutions that can be found in the market as well as developed and proposed equipment solution with different concepts for the under locomotives visual inspection without using inspection pit. In the paper is also carried out evaluation and choice of proposed solutions as part of regular product development process.
Estimation of the influence of the interaction of factors pairs on the coefficient of route execution possibility
Authors: Puzyr V G , Krasheninin O S , Zhalkin D S , Datsun Y M , Obozny O M 
Published: October 2019

Abstract
Successful execution of a route by a locomotive can depend on the combination of various operational factors. As an indicator that characterizes the reliable operation of locomotives in exploitation, the coefficient of route execution possibility is proposed to use. The task is to get a formula by which it would be possible to obtain the value of the coefficient of route execution possibility with different combinations of factors. As a tool for obtaining an interpolation formula for determining the coefficient of route execution possibility, a full factor experiment was chosen. The calculations of the model coefficients were carried out with a pairwise combination of four factors: the profile of the area, experience of the driver, the length of the shoulder, the weight of the train. The obtained models were checked for adequacy by F-test. On the received models in three-dimensional coordinates surfaces, reflecting the value of the coefficient of route execution possibility in the intervals of factorization, were constructed. An analysis of the obtained surfaces and the distribution of the selected factors by the degree of impact on the coefficient of route execution possibility were carried out.
Railway carriage mass impact on retarder noise
Authors: Zvolensky P , Kollar M , Lestinsky L , Dungel J 
Published: October 2019

AbstractThe paper is aimed on railway brake noise on set up track in a Teplicka nad Vahom arranging station. On the basis of noise measurements, it is possible to determine the presumption of impact of rail brake operation on municipalities in the vicinity of the set up rail area and to adjust its technology in the time frame so that the statutory noise limits are not exceeded. Also is possible to determine, if it is possible to use the technology in praxis to pass requirements for statutory noise limits. For operators of the arranging station and railway brakes is very important to set time schedule properly for every freight train set. It is precisely for this reason that technology can be designed according to the catchment density and the duration of the individual wagon alignment so that the freight trains concerned are not delayed. It is also possible to take into account that a shifted group of wagons with lower weight per axle will cause less braking noise.
Optimizing the braking system for handling equipment
Authors: Varecha D , Kohár R , Gajdošík T 
Published: October 2019

AbstractThe article is focused on optimizing the friction disc plates of the braking system integrated into the drive wheel of an automated guided vehicle. The introduction is focused on the application of these types of braking systems. In the next step, the individual mathematical parameters and the acting forces in the braking system are expressed. Using the equation of motion that is written in Matlab, the braking distance and the stop time are graphically expressed. During the Matlab simulation, different diameters of the braking plates are monitored to determine the braking distance. The permitted pressure in the braking plates during the test must not exceed the specified pressure of 2 MPa. The functionality of the braking plates is ensured by hydraulic power. Part of the wheel is a sensor that monitors the speed during braking. Ultimately, a continuous reduction in kinetic energy is achieved without vigorous blocking of the slats during braking. The acquisition of the paper is the output of numerical calculations, which are necessary for the correct design of the wheel with the integrated braking system.
Optimization of traction unit for low-cost automated guided vehicle
Authors: Capák T , Kohár R , Škrabala J , Galík J 
Published: October 2019

Abstract
AGV system already known today is commonplace in any large-scale production, warehousing or supply process logistics. System is not only increasing process flexibility but also the quality of products and services. They are unattended vehicles designed for towing, guiding and carrying various types of cargo using peripheral devices designed for these vehicles. The paper describes the design of the traction unit of the automated guided vehicle (AGV). The main goal of this design is optimization of traction unit for a low-cost version of commercial AGV and thereby reducing overall costs of equipment. The traction unit must be designed so that the equipment that uses such a type of traction unit meets customer requirements.
Analysis of harmonic gearbox tooth contact pressure
Authors: Majchrak M , Kohar R , Lukac M , Skyba R 
Published: October 2019

Abstract
An analysis of a conventional gear wheel shot with MPK methodology has been processed by many authors before. Harmonic gearbox systems are composed of rigid and flexible parts through which the torque is transmitted, thus generating power. The contact pressure is specifically distributed through more teeth whilst against conventional gearbox systems. Firstly, a design description of a dynamic calculation model of a harmonic gearbox system in the planar strain is analysed in this article, as well as the definition of each contact constraint between the rigid and flexible parts of these gear systems in respect of “GLUE” and “TOUCHING” contact types. The last part of this article deals with the force distribution analysis in the teeth with respect to the frictional forces in them. The graphical conclusions of this pressure on each tooth were made. This article mainly focuses on the analysis of the stress in a gear tooth of the harmonic gearbox systems, as well as the research of a special trajectory of the rigid and flexible entity in a solid circular spline of such gear systems.
Impact of a driving belt length on a device noise
Authors: Zvolensky P , Benko M , Lestinsky L , Dungel J 
Published: October 2019

Abstract
The paper is concerned with design of high-rev planetary transmission and its overall noise. The transmission is able to reach high gear ratio, and provide very high revolutions per minute. This attributes can be achieved because of unconventionally mounted planet gears in two axis. Planet gears on the outside axis are in contact with ring gear and transfer torque to planet gears in the inner axis. Inner axis planet gears transfer torque to a sun gear. The paper defines an experiment of transmission design with possibility of changing number of planetary gears. Number of planetary gears has an impact on overall noise of transmission. So it is possible to spec the transmission to fulfil of producer requirements. Aim for the experiment was to find trade-off between number of planetary gears, maximum torque, gear design and an impact on overall noise. Next, the paper presents test stand for the transmission. The test stand design allows definition of transmission construction units, without affecting noise of the transmission. Experiment also includes drive belt testing, and possibility of BLDC electric motor usage.
Experimental analysis of jet slurry erosion on martensitic stainless steel
Authors: Santacruz G , Takimi AS , Vannucchide Camargo F , Bergmann CP 
Published: October 2019

Abstract
Due to their enhanced tribological properties that contribute to an increased useful life of components, martensitic stainless steels are an excellent option for industrial applications such as hydroelectric, petrochemical, civil construction and mineral processing plants. In the present investigation, the erosive wear of AISI 410 martensitic stainless steel is evaluated after thermal treatment by quenching and tempering by mass loss, under erosive attack at 30° and 90° incidence angles, using a self-made jet slurry erosion equipment controlling parameters such as speed, volume of fluid, temperature and concentration of erosive particles of erodent. The characterization of the eroded samples was carried out in terms of the microstructure (SEM) and microhardness as well as the particle size distribution (LG) and morphology of the erodent. It was possible to establish the relationship between the slurry erosive wear and the physical properties inherent of stainless steel for this particular experimental configuration, concluding that the steel presents better resistance to jet slurry erosion wear when compared to austenitic steel commonly used in the industry.
Solution combustion synthesis of Mo-Fe/MgO: Influence of the fuel composition on the production of doped catalyst nanopowder
Authors: Zampiva R Y S , Bergmann C P , Alves A K , Giorgini L 
Published: October 2019

Abstract
Among the techniques for producing oxide catalysts, the solution combustion synthesis (SCS) has been widely used to produce high-quality nanostructured powders at low-cost. Through SCS, due to the high exothermic energy liberated by the reaction between the transition metal nitrate and the fuel, it is possible to homogeneously incorporate dopant ions into the catalyst. Besides, SCS allows the production of nanopowders with sizes in the decimal scale, which is extremely important for powdered catalysts. The smaller the particle is, the larger the surface area is. Based on these possibilities, the aim of this work is to produce Fe-Mo/MgO nanopowders by SCS. The influence of concentration and composition of the fuels glycine and polyethylene glycol (PEG) on the final product were investigated. The morphology and the physicochemical properties were characterized by X-ray diffraction (XRD), electron microscopy (SEM), granulometry and surface area analysis. The results indicated high crystallinity for the samples produced with PEG and a wide variation on the nanoparticles sizes depending on the fuel properties.
Comparing the accuracy of 3D slicer software in printed enduse parts
Authors: Šljivic M , Pavlovic A , Kraišnik M , Ilić J 
Published: October 2019

Abstract
This study aims to compare the accuracy offered by 3D Slicer Software in printing end-use parts inside a Fused Deposition Modeling process of Additive Manufacturing. The purpose, in particular, is to investigate the surface quality and the dimensional stability of the manufactured parts comparing the effect of selecting a different 3D Slicer tool among Simplify3D, Cura and Slic3r 3D. With this scope, parts were produced using these process tools while results were analysed in terms of accuracy, production time and consumption of material. Results, graphically and visually presented, show significant differences in the dimensional and surface accuracy with an optimum outcome offered by the Simplify3D as best 3D slicer tool. The Simplify3D slicer has essential advantages in printed end-use parts because creates the 3D models with significantly better accuracy and quality support.
Testing methods and equipment for palletized products
Authors: Greco A , Renzini A , Vaccari M , De Camargo F V 
Published: October 2019

Abstract
The ability to present cutting-edge solutions for packaging in the field of palletized products has to be considered as the result of the investments in research infrastructures and advances in applied researches. In the present article, main equipment and all the other testing facilities used to optimize palletized product are detailed. Tests are implemented in accordance with standard and no standard procedures up to fully innovative methods. This approach is able to provide advice both on the most appropriate palletizing scheme to pack the load, either on the best packaging methods able to conserve intact the product to the consumer. For customer it represents a great added value that allows to experience first-hand palletizing solutions, packaging and stability of the load, reducing production costs and optimizing efficiency.
Electrical polarization phenomena, dielectric relaxations and structural transitions in a relaxor-ferroelectric terpolymer investigated with electrical probing techniques
Authors: Venkatesan Thulasinath Raman , Gulyakova Anna A , Frübing Peter , Gerhard Reimund 
Published: October 2019

Abstract
Dielectric Relaxation Spectroscopy (DRS) and Thermally Stimulated Depolarization Current (TSDC) measurements were employed to study dielectric-relaxation processes, structural transitions and electric-polarization phenomena in poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) terpolymer films. Results from DRS confirm the existence of two separate dispersion regions related to a para-to-ferroelectric phase transition and to the glass transition. The dipolar TSDC peak correlates with the loss peak of the α relaxation that represents the glass transition. The electric polarization calculated from the dipolar TSDC peak (glass transition) shows a non-linear electric-field dependence and saturates at high electric poling fields. As the observed behaviour is essentially the same as that of the electric polarization obtained from direct polarization-versus-electric-field hysteresis measurements, TSDC experiments are also suitable for studying the polarization in relaxor-ferroelectric polymers. A saturation polarization of 44 mC m−2 was found for an electric field of 190 MV m−1.
Impact characteristics and stagnation formation on a solid surface by a supersonic abrasive waterjet
Authors: Thongkaew Kunlapat , Wang Jun , Yeoh Guan Heng 
Published: October 2019

Abstract
A computational fluid dynamics (CFD) study of the impact characteristics and stagnation formation on a solid target surface by an abrasive waterjet at supersonic velocities is presented to understand the impact process. A CFD model is developed and verified by experimental water and particle velocities and then used to simulate the jet impact process. The trends of the stagnation formation and its effect on the jet flow with respect to the jetting and impacting parameters are amply discussed. It is found that stagnation formation at the impact site increases with an increase in the impact time, nozzle standoff distance and nozzle diameter, while the initial peak velocity at the nozzle exit has little effect on the size of the stagnation zone. It is shown that stagnation markedly changes the water and particle flow direction, so that the particle impact angle is varied and the jet impact area is enlarged. The jet structure may be classified to have a free jet flow region, a jet deflection region with a stagnation zone and a wall jet region. Furthermore, the stagnation affects significantly the waterjet and particle energy transferred to the target surface. The average particle velocity across the jet is reduced by approximately one third due to the damping effect of the stagnation under the conditions considered in this study.
Perceptions of Alcohol Health Warning Labels in a Large International Cross-Sectional Survey of People Who Drink Alcohol
Authors: Winstock Adam R , Holmes John , Ferris Jason A , Davies Emma L 
Published: October 2019

Abstract

Aims
This paper aimed to explore perceptions of alcohol health warning labels amongst a large international sample of people who drink alcohol.

Methods
The Global Drug Survey (GDS) is the world’s largest annual cross sectional survey of drug use. Seven health warning labels were presented (relating to heart disease, liver, cancer, calories, violence, taking two days off and the myth of benefits to moderate drinking). People were asked if they were aware of the information, believed it, if it was personally relevant, and if it would change their drinking. This paper included data from 75,969 respondents from 29 countries/regions who reported the use of alcohol in the last 12 months, collected during November–December 2017 (GDS2018).

Results
The fact that drinking less can reduce the risk of seven types of cancer was the least well known, and yet was demonstrated to encourage almost 40% of drinkers to consider drinking less. Women and high risk drinkers were more likely to indicate they would reduce their drinking in response to all labels. Personal relevance was identified as a key predictor of individual responses.

Conclusion
Findings highlight the potential of a range of health messages displayed on alcoholic beverages to raise awareness of alcohol-related harms and potentially support a reduction in drinking. Further research should explore what influences personal relevance of messages as this may be a barrier to effectiveness.
Model selection for metabolomics: predicting diagnosis of coronary artery disease using automated machine learning
Authors: Orlenko Alena , Kofink Daniel , Lyytikäinen Leo-Pekka , Nikus Kjell , Mishra Pashupati , Kuukasjärvi Pekka , Karhunen Pekka J , Kähönen Mika , Laurikka Jari O , Lehtimäki Terho , Asselbergs Folkert W , Moore Jason H 
Published: October 2019

Abstract

Motivation
Selecting the optimal machine learning (ML) model for a given dataset is often challenging. Automated ML (AutoML) has emerged as a powerful tool for enabling the automatic selection of ML methods and parameter settings for the prediction of biomedical endpoints. Here, we apply the tree-based pipeline optimization tool (TPOT) to predict angiographic diagnoses of coronary artery disease (CAD). With TPOT, ML models are represented as expression trees and optimal pipelines discovered using a stochastic search method called genetic programing. We provide some guidelines for TPOT-based ML pipeline selection and optimization-based on various clinical phenotypes and high-throughput metabolic profiles in the Angiography and Genes Study (ANGES).

Results
We analyzed nuclear magnetic resonance-derived lipoprotein and metabolite profiles in the ANGES cohort with a goal to identify the role of non-obstructive CAD patients in CAD diagnostics. We performed a comparative analysis of TPOT-generated ML pipelines with selected ML classifiers, optimized with a grid search approach, applied to two phenotypic CAD profiles. As a result, TPOT-generated ML pipelines that outperformed grid search optimized models across multiple performance metrics including balanced accuracy and area under the precision-recall curve. With the selected models, we demonstrated that the phenotypic profile that distinguishes non-obstructive CAD patients from no CAD patients is associated with higher precision, suggesting a discrepancy in the underlying processes between these phenotypes.

Availability and implementation
TPOT is freely available via http://epistasislab.github.io/tpot/.

Supplementary information
Supplementary data are available at Bioinformatics online.