bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Kinematical Analysis of the Articulated Quadrilateral Mechanism
Authors: Tătaru Mircea Bogdan , Tătaru Vladimir Dragoş 
Published: June 2020

Abstract
The paper presents a numerical method of kinematical analysis of the articulated quadrilateral mechanism. Starting from Euler’s relation concerning the distribution of speeds written in projections on the fixed reference system axes, a system of differential equations describing the movement of the mechanism was obtained. This system of differential equations was then solved using numerical integration methods and the variation with respect to time of the position kinematical parameters, of the velocities (the first order kinematical parameters), and of the accelerations (the second order kinematical parameters), was obtained. Matrix writing of the differential equations was used in order to make the differential equations set out in the paper easier to solve using the electronic computer.
Avangarda (Anti)-Umană. Incursiune În Poezia Politică A Lui Paul Celan
Authors: Moroşan Ioana 
Published: June 2020

Abstract
This paper aims to analyse a part of Paul Celan's poetic discourse and study the way in which its political dimensions arise, with a particular focus on poems dedicated to Osip Mandelştam in the Nobody's Rose volume. For this purpose, a disjunction is made and justified between political poetry, or expressive discourse treating the political, and politically possessed poetry, discourse in service of ideology. Of particular interest is the social function assumed by such political poetry, triggered by the spreading of illness within the social corpus towards which the poet acts, in Ion Mureşan's conception, as a timely antibody.
Poezia visului real
Authors: Iulia-Maria Deaconu Ticărău 
Published: June 2020

Abstract
This article aims to review the anthology One Hundred and One Poems that includes a collection of poems and critical quotes selected by Alina Bako, who not only provides an overview of the lyrical universe created by Leonid Dimov, but also the critical tools needed for the specialized or non-specialized reader in order to step into the essence of Dimov’s creation. Thereby, the researcher contributes to the revival of the work of a poet who is still actual and valuable.
A Fi Evreu, A Fi Intelectual, A Fi Român Și Dunărean. Sionism Și Asimilare
Authors: Iulia-Maria Deaconu Ticărău 
Published: June 2020

Abstract
In this paper, I bring into discussion the concepts of Zionism and assimilation, as introduced in Mihail Sebastian’s novel For Two Thousand Years… Some critical points of view regarding these movements will be referred to in order to highlight the novelty of Sebastian’s approach and how he introduced these concepts within his fictional universe.
Instrumente Ale Poeticii Cognitive: O Aplicaţie Pe Lirica Lui Blaga
Authors: Pereş Paula 
Published: June 2020

Abstract
The aim of this paper is to offer a representation on how cognitive poetics can be used to analyse Lucian Blaga’s poetry. With the help of digital instruments designed for corpus linguistics, concordances of the term ‘fire’ are identified and classified, giving this cognitive process a material form, together with a hermeneutical perspective. Furthermore, an example of how the similarity in minds’ activity of a group, community, or culture regarding metaphors are englobed in a pattern, can also be remarked in this paper.
Numerical Approximation of The Weakly Damped Nonlinear Schrödinger Equation
Authors: Čiegis Raimondas , Pakenienė Violeta 
Published: June 2020

AbstractIn this paper we consider the one-dimensional nonlinear Schrödinger
equation. The equation includes an absorption term, and the solution is periodically
amplified in order to compensate the lose of the energy. The problem describes propa-
gation of a signal in optical fibers. In our previous work we proved that the well-known
Crank—Nicolson scheme is unconditionally unstable for this problem. We present in
this paper two finite difference approximations. The first one is given by a modified
Crank—Nicolson scheme and the second one is obtained by a splitting scheme. The
stability and convergence of these schemes are proved. The results of numerical exper-
iments are presented and discussed.
The Fast Solution of Periodic Integral and Pseudodifferential Equations by Gmres
Authors: Plato R. , Vainikko Gennadi 
Published: June 2020

Abstract In this paper we consider GMRES to solve finite-dimensional approxi-
mations of a class of well-posed linear operator equations in Hilbert spaces. It is shown
that the speed of convergence is superlinear. As a consequence we have that GMRES
can be used as a fast solver of a fully discrete variant of the trigonometric Galerkin
equations associated with periodic integral equations.
On the Quasi-monotone Modified Method of Characteristics for Transport-diffusion Problems with Reactive Sources
Authors: Seaïd Mohammed 
Published: June 2020

AbstractThis is an attempt to construct a strong numerical method for transportdiffusion
equations with nonlinear reaction terms, which relies on the idea of the Modified
Method of Characteristics that is explicit but stable and is second-order accurate
in time. The method consists in convective-diffusive splitting of the equations along
the characteristics. The convective stage of the splitting is straightforwardly treated
by a quasi-monotone and conservative modified method of characteristics, while the
diffusive-reactive stage can be approximated by an explicit scheme with an extended
real stability interval. A numerical comparative study of the new method with Characteristics
Crank-Nicholson and Classical Characteristics Runge-Kutta schemes, which
are used in many transport-diffusion models, is carried out for several benchmark problems,
whose solutions represent relevant transport-diffusion-reaction features.
Experiments for transport-diffusion equations with linear and nonlinear reactive sources
demonstrate the ability of our new algorithm to better maintain the shape of the
solution in the presence of shocks and discontinuities.
Modified Three-point Difference Schemes of High-accuracy Order for Second Order Nonlinear Ordinary Differential Equations
Authors: Kutniv Myrosalv V. 
Published: June 2020

AbstractThis work discusses issues on the design and analysis of three-point difference schemes for the nonlinear boundary-value problem. A new effective implementation
of an exact three-point difference schemes on irregular grids in terms of homogeneous three-point difference schemes of a high-accuracy order is proposed.
Integral Equations of the Linear Sloshing in an Infinite Chute and Their Discretization
Authors: Galanin Mikhail M. , Nizkaya Tatiana V. 
Published: June 2020

AbstractIn this work we propose a new method for solving linear elliptic equations in an unbounded domain.
The method is based on the representation of the exact solution as the sum of two functions.
The former is the solution of some auxiliary problem and the latter can be found using the
Green formula. Using finite-difference schemes, this method has a quadratic order of accuracy
independent of the size of the computational domain, and in the 2D case requires O(N³) operations
to find the solution, where N³ is the number of nodes within the computational domain. In the 3D
case the method requires O(N^4) operations. Test computational examples showing the method's efficiency are given.
Approximation to the Solution of the System of Nonlinear Stochastic Differential Equations
Authors: Malyutin Victor 
Published: June 2020

AbstractIn this paper we consider the system of nonlinear stochastic differential equations. The solution of these equations is approximated by finite series of definite
integrals where every term of the series can be evaluated. To construct the approximation, the linearization technique and the technique for noncommuting matrices are used.
On Parallel Numerical Algorithms for Simulating Industrial Filtration Problems
Authors: Čiegis R. , Iliev O. , Lakdawala Z. 
Published: June 2020

AbstractThe performance of oil filters used in the automotive industry can be
significantly improved, especially when computer simulation is an essential component
of the design process. In this paper, we consider parallel numerical algorithms for
solving mathematical models describing the process of filtration, filtering solid particles
out of liquid oil. The Navier — Stokes — Brinkmann system of equations is used to
describe the laminar flow of incompressible isothermal oil. The space discretization
in the complicated filter geometry is based on the finite-volume method. Special care
is taken for an accurate approximation of the velocity and pressure on the interface
between the fluid and the porous media. The time discretization used here is a proper
modification of the fractional time step discretization (cf. Chorin scheme) of the Navier-
Stokes equations, where the Brinkmann term is considered in both the prediction and
the correction substeps.
A data decomposition method is used to develop a parallel algorithm, where the domain
is distributed among the processors by using a structured reference grid. The MPI
library is used to implement the data communication part of the algorithm. A theoretical
model is proposed for the estimation of the complexity of the given parallel
algorithm and a scalability analysis is done on the basis of this model. The results of
the computational experiments are presented, and the accuracy and efficiency of the
parallel algorithm is tested on real industrial geometries.
Robust discretization and a posteriori control for strongly oscillating solutions of the stationary Schrödinger equation
Authors: Dörfler Willy 
Published: June 2020

AbstractWe consider an example of a boundary value problem on an interval where the solution can
show strong oscillations. In order to solve such a problem numerically, standard methods
require meshes that resolve these oscillations and will thus need a prohibitively large
number of unknowns. In our approach we use special problem dependent basis functions in the
finite element method and provide an analysis for a priori and a posteriori bounds. In this
way we can construct an efficient approximation method for the solution of such boundary
value problems.
Determination of conversion factors for pine and spruce logs in stacks
Authors: Jodłowski Krzysztof , Witkowska Joanna 
Published: June 2020

AbstractThe aim of this article was to determine the conversion factors for stacked pine and spruce logs with a length of 3–6 m. To this end, we measured stacks and their logs of a total of 3322.12 steres of pine logs and 1468.46 steres of spruce logs. The conversion factors obtained in this work for pine logs of varying lengths negatively correlate with log length. However, statistically significant (p<0.05) differences were only observed between the longest logs as well as logs of 3 and 4 m in length. This may be due to various factors (mainly curvature, the presence of buttresses on butt logs and taper) influencing the stacking process of logs of increasing length. For logs with a length of 3, 4 and 5 m, the average value of the conversion factor increased with the log thickness class, although this dependence was not statistically significant. In the case of spruce raw material, the obtained conversion factors are similar to the values determined in previous studies. There was no significant correlation between the length of the log and its average diameter. A prerequisite for using conversion factors for large-sized logs is accurate stacking, where special attention should be paid to the parallel stacking of individual logs, aligning their front and back sides to be flush and forming the stack so that its top plane is parallel to the ground.
Challenges concerning terminology and methodology in forest sciences
Authors: Wodzicki Tomasz J. 
Published: June 2020

Abstract
Commonly used scientific terms and their specific meaning in the context of forest sciences and services were the focus of this article. Special attention was devoted to analyzing the meaning of ecological terminology such as “niche”, “homeostasis”, “natural” and “succession” in order to better understand problems related to the interaction between and within complex biological structures such as forest multi population ecosystems and the human population. Especially the role of Homo sapiens occupying an ecological niche in forest ecosystems, as well as in the Earth’s biosphere, formed the core in this discussion. One important challenge in terms of terminology and methodology concerns the considerable progress and interaction between achievements in the general sciences such as biology, physics, physiology, mathematics, sociology and economy as compared to forest sciences. Challenges are obviously accompanying the development in scientific terminology and are thus an important factor when conveying knowledge to the future doctors of forest sciences.
Colloquiality and stylistics of online alternative news media
Authors: Patráš Vladimír 
Published: June 2020

Abstract
The main line of the study is bound to the conditions, demonstrations and effects of colloquiality (colloquialization) parameter that has been applied in the current electronic media communication sphere. Colloquiality as a non-verbal, structural and compositional attribute of a piece of communication is primarily present in the open, semi- and non-official communication contacts with direct, immediate involvement of their participants. In traditional print journalism built on the verified principles of printedness/ writtenness, colloquiality occurs as a secondary, accompanying attribute of the media communication pieces. Regardless of the genre affiliation of the newspaper products, it helps perform their, e.g., documentary, persuasive, captivating, characterizing, relieving or aesthetic functions. Apart from the parameter of printedness, both mainstream and alternative (complementary) online media generally calculate upon the advanced options of the visual code systems. Thus, language-based online newspapers are easily supplemented with simultaneous, additional, or substitutional means and procedures of cinematographic origin, e.g., a surprising choice, dynamic edition, purpose-made superposition of the text, audio and video sequences being applied through hyperlinking, audiovisual effects, etc. Besides, accompanying dialogization and consequent de-officialization of online newspapers are changing conventional characteristics of the journalistic style. The expanding zone of colloquiality loosens the standards of codified language in written/printed communication. Boundaries between the varieties in the framework of language stratification are already easily penetrable. The material base and argument platform of the study consist of author texts published in the Slovak online alternative news media.
Analysis of Possibility Limiting the Time of Test Injector in Diesel Engine Using Factory Test Bench Producers of these Elements
Authors: Bąk Witold , Wojnar Grzegorz 
Published: June 2020

Abstract
Regeneration of parts is the most correct form of use of worn out components and contributes, among others, to reduce CO2 emissions. In the case of elements of fuel injector systems, very high precision is required and such regeneration should be carried out using the original parts. It also requires testing on the original testing stands of these manufacturers, which very often characterized by the fact that it is not possible to perform a short test, which means that it is only possible to perform a time-consuming comprehensive test. An unquestionable advantage in some cases would be the possibility of preliminary verification of the correct operation of the regenerated subassembly without the need for a full time-consuming test. In the present situation, only after completing a time-consuming comprehensive test of the diagnosed element of the injection system, it is often necessary to carry out its disassembly, replacement or correction of one of the components and reassembly with the next time-consuming test. In the case of low unemployment in the labour market, this is extremely unfavourable, and it is often not possible to organize work in such a way that the diagnostic test of the subassembly takes place without the participation of an employee. On the basis of the analyses presented in this article, carried out in the research and development department in company whose employee is one of the co-authors, it can be stated that in the current situation on the labour market where skilled workers are required to work and for the development of science is the most purposeful recognition of the possibility of using vibroacoustic signals to shorten time of tests, which with a high probability may end in a negative result. The preliminary analysis carried out, show that limitation of diagnostic time can be over 35%.
Modelling Method of Dynamic Characteristics of Marine Thin-Walled Structure
Authors: Van Doan Do , Szeleziński Adam , Murawski Lech , Muc Adam 
Published: June 2020

Abstract
Thin-walled structures are very popular in industries, especially in the field of shipbuilding. There are many types of equipment and structures of ships, which are made up of thin-walled structures such as hull, deck and superstructure. Therefore, the analysis and understanding of the static and dynamic characteristics of a thin-walled structure are very important. In this article, we focus on vibration analysis of a typical thin-walled structure-rectangular plate, a basic structure of the hull. Vibration analysis of a rectangular thin plate is conducted by two methods: numerical modelling method of the finite element on Patran-Nastran software platform and experimental method implemented in the laboratory of Gdynia Maritime University. Thin rectangular plate is fixed one end by four clamping plates and is modelled with finite elements and different meshing densities. The numerical model of thin rectangular plate is divided into four cases. Case 1, thin rectangular plate, and clamping plates are modelled with two-dimensional elements. Case 2, the rectangular thin plate is modelled with two-dimensional elements; the clamping plates are modelled with three-dimensional elements. Case 3, both the rectangular thin plate and clamping plates are modelled with three-dimensional elements. Case 4, the rectangular thin plate, and clamping plates are modelled with three-dimensional elements with larger mesh density to increase the accuracy of the calculation results. After that, the results of vibration analysis according to the numerical modelling method on Patran-Nastran software platform for these cases were compared with the measurement results. From there, assess the accuracy of analysis results of selected numerical model methods and the ability to widely apply this numerical model method to other marine structures.
Distributions of Hydrodynamic Pressure in the Gap of Slide Journal Bearing Lubricated with Ferro-Oil
Authors: Frycz Marcin 
Published: June 2020

Abstract
This research work is part of a broader comprehensive issue, which is the analysis of flow and operating parameters of journal slide bearings lubricated with ferro-oil. In this article, the author presents only the main assumptions and essential transformations of the analytical and numerical model for determining the pressure distributions in the gap of a slide journal bearing lubricated with ferro-oil. It is cardinal that the rheological and magnetic values of ferro-oil parameters adopted in numerical calculations are based on the results of actual values obtained in the author’s earlier research work. There are presented the pressure distributions by abovementioned method in the article for cases of bearings lubricated with ferro-oils with different concentration of magnetic particles. The obtained results are shown in the form of a set of four complementary characteristics of the dimensionless pressure distributions. First and main of them are the calculations for classical Newtonian lubrication but they take into account the influence of the magnetic field on the distributions. The next of the presented characteristics are so-called “corrections” of pressure distribution values, taking into account as follows: effects of changes in ferro-oil viscosity related to temperature changes, impacts of ferro-oil viscosity changes related to pressure changes and the effect of non-oil properties of the lubricant. The article includes a qualitative and quantitative analysis of the obtained results as well as observations and conclusions are presented in it.
The Development of the World Fleet of Electric Vehicles in Years 2010–2017 with Emphasis on Fuel-Cell Vehicles
Authors: Gis Wojciech , Menes Maciej 
Published: June 2020

Abstract
The article discusses the development of the world EV fleet in years 2010-2017. Estimates of fleet of plug-in hybrid electric vehicles (PHEV) and BEV in the world are presented. The total number of PHEVs registered in the world in 2016 was roughly 800 thousand (650 thousand in EU). Despite the fact that the sale of electric vehicles has increased considerably in recent years, in particular over 1.1 million in 2017, and also hybrid electric vehicles (PHEV) to approx. 760 thousand in 2017. The article also discusses the development of the electric vehicles market and annual new registrations of vehicles in a breakdown into respective countries. China is the definite leader in this area. In 2017 there were almost twice more BEVs registered in China than in the US and EU together. While the increase in the sale of BEVs in years 2016-2017 in the EU and the US accounted for approx. 50%, it came to over 90% in China. Among eight top worldwide BEV producers, there are four Chinese manufacturers. In the analysed 2017, there were slightly more than 7 thousand of hydrogen-fuelled passenger cars (FCEV) in use, with over 3,500 in the US, 2,300 in Japan and approx. 1,200 in Europe, and several hundred hydrogen-fuelled buses and several dozen hydrogen-fuelled trucks. The article also addresses the development of hydrogen refuelling stations (HRS) in recent years in different countries in the world, bearing in mind that the quantitative development of the hydrogen-fuelled car fleet is strongly associated with the number of hydrogen refuelling stations.
Energy Balance of a Vehicle Equipped with Hybrid Propulsion System Fuelled with Alternative Fuels
Authors: Karczewski Mirosław , Szczęch Leszek , Polak Filip 
Published: June 2020

Abstract
Article presents the energetic balance of small-unmanned vehicle hybrid power transmission. The vehicle equipped with serial hybrid transmission consisted of electric engines connected to the battery pack and small Diesel power generator. In mentioned construction, battery is used as energy buffer and combustion engine is used more as emergency power supply, and is turned on when battery is depleted. In other condition, power generator can be turned off, without reducing power of transmission parameters, except its range. Vehicles with hybrid drive are very common chosen vehicles by users. More and more often, we also talk about searching for replacement fuels for internal combustion engines, so also for those with hybrid drive. The research was carried out on an unmanned land platform equipped with a hybrid propulsion system supplied as standard with Diesel oil. The article presents the problems of comparing the efficiency of a hybrid vehicle fuelled with Diesel oil, but also with alternative fuels based on kerosene and other components. For test, three types of fuels were used, standard Diesel oil, F-34 and with experimental mixture of Jet A-1 fuel with 10% of 2-ethylhexanol. Energy used for charging of the battery, from tank-to-wheel, was calculated. This also enables to calculate total efficiency of such hybrid power transmission, powered with different fuels.