bluuebunny/crossref_metadata_2025_split huggingface dataset:
A regression-based model evaluation of the Curie temperature of transition-metal rare-earth compounds
Authors: Nguyen Duong-Nguyen , Pham Tien-Lam , Nguyen Viet-Cuong , Nguyen Anh-Tuan , Kino Hiori , Miyake Takashi , Dam Hieu-Chi 
Published: October 2019

Abstract
The Curie temperature (T
C) of RT binary compounds consisting of 3d transition-metal (T ) and 4f rare-earth elements (R) is analyzed systematically by a developed machine learning technique called kernel regression-based model evaluation. Twenty-one descriptive variables were designed assuming completely obtained information of the T
C. Multiple kernel regression analyses with different kernel types: cosine, linear, Gaussian, polynomial, and Laplacian kernels were implemented and examined. All possible descriptive variable combinations were generated to construct the corresponding prediction models. As a result, by appropriate combinations between descriptive variable sets and kernel formulations, we demonstrate that a number of kernel regression models can accurately reproduce the T
C of the RT compounds. The relevance of descriptive variables for predicting T
C are systematically investigated. The results indicate that the rare-earth concentration is the most relevant variable in the T
C phenomenon. We demonstrate that the regression-based model selection technique can be applied to learn the relationship between the descriptive variables and the actuation mechanism of the corresponding physical phenomenon, i.e., T
C in the present case.
I-V Characteristics of In-Plate Graphene Nanoribbon/h-BN Heterojunctions and Resonant Tunneling
Authors: Tomiya Mitsuyoshi , Sakamoto Shoichi , Wakai Taiga 
Published: October 2019

Abstract
We present here the first principle calculations of the electrical properties of in-plate heterojunctions of armchair graphene nanoribbon/h-BN(AGNR/h-BN)s. The calculations are carried out using SIESTA package, which is comprised of numerical codes of the density functional theory(DFT) and the non-equilibrium Green’s function(NEGF). Especially, adopting the conductive (3n-1)-family of AGNR((3n-1)-AGNR) makes the lead parts on both side of the model metallic. Two transverse arrays of h-BN, which is a wide-gap semiconductor, are embedded in the middle of (3n-1)-AGNR and act as a double barrier system.
The quantum double barrier tunneling is found in the transmission functions(TF) and I-V characteristics of 8, 11, 14-AGNR/h-BN. The TF shows significantly spiky peaks in the neighborhood of the Fermi energy, and consequently, it results in step-sise I-V characteristics. Simple one-dimensional Dirac equation model for the double barrier system is also proposed to analyze numerical results. Our model reproduces most of the peaks of the transmission functions nearby the Fermi energy, as a result of quantum tunneling.
A new formulation of heat dissipation in a rocking Büttiker-Landauer ratchet model
Authors: Mazzitello Karina I , Iguain José L , Jiang Yi , Family Fereydoon , Miguel Arizmendi C 
Published: October 2019

Abstract
Thermal ratchets achieve net particle transport through recti cation of thermal uctuations, which arise from one or more heat baths in the system. We propose a new formulation of heat dissipation from the ratchet to the thermal baths, using a rocking Büttiker-Landauer ratchet model. We found that heat transport between the ratchet and the heat baths is related to the effective temperature through the generalization of the uctuation-dissipation theorem for systems far from equilibrium. We showed that the net heat transport between the ratchet and the heat baths is different from Fourier’s law and is the sum of two terms which are proportional to the nth power of the difference between the effective temperature of ratchet and the temperature of the baths. The power n depends only on the temperature of the bath, while the thermal conductivity also depends on the ratchet potential. These ndings suggest that anomalous heat dissipation can be a non-equilibrium measure for systems far from equilibrium.
Two-dimensional solitary wave solution to the quadratic-cubic nonlinear Schrödinger equation
Authors: Phibanchon Sarun , Rattanachai Yuttakarn 
Published: October 2019

Abstract
The Madelung fluid transformation is applied to find the link between the modified Korteweg-de Vries and the quadratic-cubic nonlinear Schrödinger equation. The two-dimensional solitary wave solution of the quadratic-cubic nonlinear Schrödinger equation will be determined by the Petviashvili method. This solution will be used for the initial condition for the time evolution to study the stability analysis. The spectral method is applied for the time evolution.
Phase diagram of six-state clock model on rewired square lattices
Authors: Surungan Tasrief 
Published: October 2019

Abstract
The six-state clock model (SSCM) on rewired square lattice is studied using Monte Carlo simulation with Wang-Landau algorithm. This is a discrete counterpart of the well-known XY model, the native host of a unique topological phase transition called Kosterlitz-Tholess (KT) transition. The model has two KT transitions, i.e., at temperature T
1 and T
2, where T
1 < T
2. The first transition separates the lower temperature magnetic order and the quasi-long range order (QLRO) also known as KT phase; while the second transition separates the QLRO and the higher temperature paramagnetic phase. It has been established that the presence of KT phase is affected by the presence of randomness in the form of site and bond dilution. This intermediate phase is totally ruled out if bonds or sites of the lattice are no longer percolated. Here different type of randomness is probed, namely the rewired lattices, obtained by randomly adding one extra bond to each lattice site, and connect the site to one of its next-nearest neighbors. As a results, the average number of neighbors C increases. The increase of C affects the existence of KT phase. For each value of C, the KT temperatures, T
1 and T
2, were estimated from the plot of specific heats. Variation of KT temperatures for different values of C is observed, which is plotted with respect to each corresponding C to obtain the system phase diagram.
Impact of New Conformal Coupling on Spontaneous Scalarization of Neutron Stars
Authors: Fauzi M. I. , Ramadhan H.S. , Sulaksono A. 
Published: October 2019

Abstract
The scalar-tensor gravity as one of the alternative theories of general relativity has some interesting features. In the case of compact objects it predicts a unique phenomenon which is known as spontaneous scalarization, as shown by Damour and Espasito-Farese [1]. This phenomenon does not appear within the general relativity. In this note, we investigate a new conformal coupling function i.e., A(φ) = 1 − ln[1 − 0.5β(φ − φ
0)2] and its consequences in neutron stars. In the case of a polytropic equation of state, we have found that the spontaneous scalarization starts to appear when βc
≈ −4.35. We also found that for the realistic equation of states the βc
depends on the composition and the stiffness of the equation of state.
Background Dependence of Pole Position in Kaon Photoproduction
Authors: Clymton S. , Mart T. 
Published: October 2019

Abstract
Pole position has become a new important parameter to describe the properties of nucleon resonance. Compared to the Breit-Wigner parameters, the pole position is less model dependent. The shape of resonance based on our previous formalism is strongly affected by the hadronic form factors. We study the effect of different background parameters on the extracted pole position. We have also used different hadronic form factors to see the effect on the background dependence of pole position. We obtained the necessary parameters by fitting to about 9000 experimental data points. We expect to find appropriate hadronic form factors that lead to the background independence. Therefore, this study will shed a light on the choice of the appropriate hadronic form factors.
A vision for improving global flood forecasting
Authors: Lavers David A , Harrigan Shaun , Andersson Erik , Richardson David S , Prudhomme Christel , Pappenberger Florian 
Published: October 2019

Abstract
Global hydrological forecasts are now produced operationally on a daily basis. However, the lack of global river discharge observations precludes routine flood forecast evaluation, an essential step in providing more skilful and reliable forecasts. A vision is expounded for greater and more timely exchange of global river discharge observations, which would result in improved flood awareness and socioeconomic benefits in some of the World’s most vulnerable countries.
Technological investigation of binderless nanocrystalline cubic boron nitride (BNNC) as cutting material for groove turning of hardened steels
Authors: Hänel A , Hasterok M , Nestler A , Schwarz M , Brosius A , Kroke E 
Published: October 2019

Abstract
By using a high-pressure/high-temperature process (HP/HT), it is possible to synthesise new ultra-hard cutting materials called binderless nanocrystalline cubic boron nitride (BNNC). The starting material is a pyrolytically deposited hexagonal boron nitride (pBN), which is converted at temperatures of 1400 °C – 2200 °C and pressures of 10 - 20 GPa in a direct synthesis without any binding material. The average crystallite size of this material is 50 - 100 nm and is thus significantly smaller than conventional polycrystalline cubic boron nitride (PCBN) cutting materials. Compared to conventional PCBN cutting materials, this material has an increased hardness, hot hardness and better temperature resistance. This provides an excellent alternative to extend the process limits for the machining of hardened steels and superalloys. In this conference paper, the first technological results for groove turning in hardened steels with this new promising cutting material will be presented.
Investigation the influence of surface topography on scattering ability of aluminium reflectors from infrared quartz heater
Authors: Slavov S D , Dimitrov D M , Zlateva P N 
Published: October 2019

Abstract
Infrared (IR) heaters are used in many industries where heat treatment is required as well as in household appliances. One of the main problems with this type of equipment is non-uniform temperature field in the heating area, which results in a different degree of heating of the heated objects. In order to achieve greater uniformity of the temperature, some approaches are explored in practice, such as using embossed reflectors, mounting two or more heaters side-by-side, using emitter lamps with power controller devices, formation of gold or silver coatings, etc. The drawbacks of these approaches are complicating the design of the IR heaters, reducing the dimensions of heating area, increasing energy consumption, etc. Among the above-mentioned methods, the creation of a specific reflector surface topography is easily attainable and inexpensive technological approach. The main task of the present study is to investigate experimentally the influence of the specific patterns, obtained by ball burnishing process on scattering ability of the aluminium reflectors from infrared quartz heater.
Research in order to decrease the time manufacturing unit using the combined tools
Authors: Indre CI , Blaga FS , Miculaș C , Negrau DC 
Published: October 2019

Abstract
The work presents the results of the experimental research carried out with the purpose of increasing the productivity of the machining process in the case of a part of the automotive industry. Thus, increasing of volume the parts ordered by the beneficiary, researches have been done for the replacement of simple cutting tools (standards cutting tools) with special cutting tools (combined tools). The use of the combined cutting tools to optimize the productivity of fabrication permitted decrease operative time by reducing the time to change the tools and the machining time. The use of the combined tools allowed machining multiple surfaces. In these circumstances, it was found an improvement in both productivity and quality of the products obtained in the manufacturing process.
Main aspects of establishing the machining parameters of the railway wheelset’s rolling surfaces
Authors: Ghionea I G , Ghionea A L , Predincea N , Balazs E 
Published: October 2019

Abstract
In the rolling subsystem of the railway vehicles, the wheelset is the main component. This is subject to large and variable loads and to a continuous wear-off process. The wheels’ rolling surfaces of the wheelset are processed on specialized lathes under precision conditions (profile, roughness) defined by specific rules. The geometric elements defining the tread profile are rigorously defined in norms and standards, which implies specific precision conditions. Profiling and re-profiling are performed by simultaneously turning both wheels of the wheelset. The technological parameters are determined considering the material to be machined, the material of the cutting tool (recommended by the catalogues), the quality and the roughness of the processed surfaces, the rigidity of the lathe, the power and torque of the electric motors used or driving the generating kinematic chains (main, feed). Also, the status and dimensions of the machining allowance, number of passes and the type of NC port-program used, are very important. In the paper are presented as examples some geometrical characteristics of the wheels and wheelset and are recommended values of the technological parameters, which are set numerically or experimentally. Based on these, values of speed, forces, moments and cutting power could be calculated.
Numerical simulation of material failure in single point incremental forming process
Authors: Rusu G P , Popp M O , Oleksik M , Rodean C 
Published: October 2019

Abstract
The sheet metal parts obtained through single point incremental forming process show a thinning and also there is a high possibility of material failure. In order to avoid the failure of the material during the process, it is a good practice to use numerical simulation through finite element method to prevent this phenomenon. The aim of this paper is to investigate the prediction of the failure moment of the aluminium sheet metal using various failure criteria. Commonly used failure criteria are: Tresca or maximum shear stress criterion, von Mises yield criterion, Hill yield criteria and various invariants of the Cauchy stress tensor. For the numerical simulation of the single point incremental forming process, the semi-finished part is discretized using shell elements which allow determination of material thinning and also it is possible to observe the moment of material failure. This paper will treat also the influence of the wall angle over the moment of material failure.
Robust design application for optimizing ABS fused filament fabrication process: A case study
Authors: Tsiolikas A , Mikrou T , Vakouftsi F , Aslani K E , Kechagias J 
Published: October 2019

Abstract
The current paper is a case study of optimizing fused filament fabrication (FFF) process using robust design. FFF process is a low cost 3d printing process that uses ABS (Acrylonitrile-Butadiene-Styrene) filament in order to build progressive layer by layer, physical prototypes. Four (4) parameters having three levels each ones is used (Deposition angle, Layer thickness, Infill ratio, Infill pattern). The quality indicator that used for the optimization process is the dimensional accuracy. It was found that the layer thickness is the most important parameter in the reported experimental area.
An internal combustion engine visualization physical prototype applying digital manufacturing
Authors: Kitsakis K , Aslani K E , Vaxevanidis N , Kechagias J 
Published: October 2019

Abstract
Nowadays computers have invaded all levels of production, thus improving the quality and quantity of products. Digital manufacturing involves all tools for design, simulate, and programming machine tools in order to manufacture prototypes or tools for production use. This project is a case study of digital manufacturing for prototyping of an internal combustion engine visualization model. Solidworks is used for 3D modeling of all parts of the engine. Fused filament fabrication (FFF) is used for physical modeling of the engine parts. Pros and cons of the manufacturing process are discussed. It is concluded that parameter optimization is needed in order to improve quality indicators of the 3D printed engine parts.
Simulated 3-axis versus 5-axis Processing Toolpaths for Single Point Incremental Forming
Authors: Racz G S , Breaz R E , Oleksik V S , Bologa O C , Brîndașu P D 
Published: October 2019

Abstract
Accuracy and productivity of the parts manufactured by single point incremental forming (SPIF) are influenced by the proper selection of toolpaths. CAM software packages are often used for generating the toolpaths for the process. Literature survey have revealed that contour curves and spatial spirals are the most used toolpaths for SPIF. These toolpaths are generated using 3-axis approaches, meaning that the tool axis is maintained parallel to the vertical axis. The 3-axis approach was justified using 3-axis CNC milling machines as the main technological equipment for SPIF. However, nowadays, the wide spreading of both 5-axis CNC milling machines and industrial robots, with far superior kinematic capabilities justifies the research of more complex toolpaths for unfolding SPIF. In this paper, 5-axis toolpaths, where the tool is oriented by normal to machining surfaces are proposed and compared with 3-axis toolpaths, by means of simulation.
Selection of effective equipment for shotcrete
Authors: Stepanov M A , Kaitukov B A 
Published: October 2019

Abstract
The analysis of technological equipment used in the shotcrete. Defines the main technical characteristics of mixer applications in the preparation of the mixture. With regard to the technical parameters and characteristics of the mixture determined the Reynolds number. Between the Reynolds number and the rotation frequency of the drum there is a positive correlation, increasing the dependence has a linear character. The Reynolds number is found that mode-mixing of the concrete is turbulent. Analysis of technical characteristics of sprayed plants were allowed to establish the dependence of their output power
Computational fluid dynamics in RTM method of the carbon composites molding
Authors: Paździor P , Szczepanik M 
Published: October 2019

Abstract
The article focuses on simulating flow of epoxy resin in injection mold with carbon fiber fabric inside. Performed simulations were based on the process of manufacturing composite elements using modern RTM method. RTM method is used in production of high-end and sports car parts, and other lightweight products requiring high strength. It consists in injecting the resin under pressure into a closed mold with reinforcement. One of major problems in this method is providing adequate flow of the resin in injection mold and a complete supersaturation of reinforcement with a thermosetting resin. These aspects depend strongly on the direction of the fibers in the carbon fabric and porosity of the reinforcement. Information about proper construction of the mold and influence of fiber orientation and porosity can be obtained by numerical simulations using CFD commercial software Moldex3D. Research was based on actual process of manufacturing car mirror covers. Analysis of obtained results focused on the impact of changes in process input parameters. In particular, parameters such as the porosity and direction of fibers in the reinforcement were investigated. Test results are compared in terms of the degree of reinforcement supersaturation in the mold. Based on performed tests, appropriate conclusions were drawn.
Studies and Research on the Stress – Strain Analyses of the Polyethylene Pipe-Fitting Assemblies Accidentally Subjected to an External Force
Authors: Avrigean E , Filip S M 
Published: October 2019

Abstract
The paper aims at analyzing the behavior of the polyethylene pipe - fitting assembly in the case of accidental stress due to the accidentally occurring external forces (mechanized excavation in the assembly area). The study will identify the necessary computing relationships and the minimum value of the force to which the analyzed assembly breaks, as well as some solutions for avoiding these accidental stresses. A three-dimensional model of the assembly will be made by applying the external forces on three main directions, following the maximum stresses for the same value of the external force. Also, a welding of a polyethylene pipe-fitting assembly will be carried out and it will be subjected to three stresses on the three directions so that a parallel can be made between the results. The study will also observe the way in which the temperature is distributed throughout the assembly and the areas where the obtained temperature reaches the highest value during welding.
Study of the opto – electronic coupling in some complementary metallic – dielectric metamaterials used as biosensors
Authors: Ionescu D , Apreotesei G 
Published: October 2019

Abstract
Using of the metamaterials improves the sensitivity and resolution of sensor devices, having multiple applications in biomedicine (imaging, biomarkers, telemedicine, etc.). We have studied the effect of different types of ordering in the lattices of nanostructures inside the metamaterial samples. Structures consisting of metallic atoms (tens of nanometers diameter) arranged relative periodically in a dense dielectric matrix have been analyzed by simulation methods. We have focused on the opto-electronic coupling phenomena and the interactions between plasmons and the applied field. A study of the electron scattering processes was performed, the simulational data being used to calculate the reflectance and permittivity in function of the wavelength, in the range of 500…2300 nm. The electromagnetic properties of the metamaterial samples depending on particles shape, dimensions and on the reports between metallic inclusions dimensions and the dimensions of the dielectric matrix where are included have been studied and new configurations were proposed in order to improve the metamaterial sensors performance. We expect an increment in the response to the exciting field of about 7%, in a more dense state of spins characterising the new material samples.
Microwave absorption and reflection properties of a composite dielectric absorber
Authors: Shorstkii I , Sosnin M 
Published: October 2019

Abstract
Microwave assisted technologies and its application are widely used in different research fields. One of the main difficulty of this area is to design a treatment chamber. The aim of this paper is to measure power absorption and calculate average surface microwave power density of composite dielectric materials, based on plant particles. Obtained microwave-absorbing characteristics of composite plant material can be used in microwave assisted processes and high-performance microwave treatment chambers design to facilitate the research in microwave assisted drying and extraction. The research includes experiments with different positioning of the composite materials from reflective metal screen inside the chamber-waveguide.