bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study for the dispersion of particulate matter emissions from a steel industry using Gaussian Plume equation through computational modeling
Authors: Maués C S , Guimarães C S , Martinez-Amariz A 
Published: November 2019

Abstract
Mathematical models allow evaluating air pollutants effects to the environment, being a relevant tool for planning and regulatory purposes. The present study aims to evaluate the air quality of Volta Redonda, Brazil, due to particulate matter emitted by stationary point sources of a large steel plant using meteorological data from three monitoring stations. A mathematical model was developed linking Matlab® and RStudio®, using the Gaussian dispersion equation and Google Maps to visualize the results. Observed data revealed southern, north-western and northern light prevailing winds that were used to simulate stable and unstable atmosphere conditions according Pasquill-Guifford classification. Results have exposed elevated concentrations of particulate matter in ambient air, reaching particularly Santa Cecilia neighbourhood. National air quality standards recently updated were partially met however numerous violations were indicated, considerably higher in Santa Cecilia station (47.98%), followed by Belmonte (6.69%) and Retiro (4.17%), indicating a forthcoming need for an update of the technologies and processes that emit particulate matter to improve the city air quality, preventing from environmental and human health effects.
Virtual laboratory for measuring of elastic modulus with stress and strain for different metals
Authors: Acevedo J C , Trejos J G , Celis D M , Herrera J R , Cristiano K L , Triana D A 
Published: November 2019

Abstract
The Colombian ministry of information and communications technologies is leading a digital revolution to bring computer and internet equipment to rural areas, taking into account that in these areas there are educational establishments that do not have equipment and materials for the performance of laboratories or experimental demonstrations. Therefore, this project proposed the development of a virtual learning laboratory for the study of the elastic modulus, obtained from real tensile-compression tests. It is important to clarify that there is not theoretical procedure to obtain stress-strain curves out of their linear regime. The virtual laboratory was developed in python language. The simulation allows the students to manipulate tensile-compression test for different materials. Also, they can visualization of the procedure, the stress-strain curve, and the Young modulus, all with the aim of transferring the conceptual and procedural knowledge of the physical phenomenon to the student.
Collaborative work as a learning strategy to teach mathematics incorporating robotics using led godt education system and fischertechnik in seventh graders at the school Isidro Caballero Delgado in Floridablanca Santander Colombia
Authors: Rico-Bautista N A , Rico-Bautista D W , Medina-Cárdenas Y C 
Published: November 2019

Abstract
This article describes the impact of collaborative work to teach Mathematics in Seventh graders (70 students) at the school Isidro Caballero Delgado, Ocaña, Colombia. Led godt education system and fischertechnik allowed a great interaction and participation and provided the tools to incorporate robotics in the classroom. Moreover, these tools are used as a learning strategy to achieve understanding and analysis in the solving problems teaching math. Students became more critical and responsible facing daily solutions and a better understanding of basic problems of geometry, math and statistics. Students also learnt about and improved interpersonal abilities and improved social interaction. It also allowed making learning effective creating a better environment to improve the acquisition of mathematical concepts.
Usable rainwater volume; results of a hydrological study conducted at the Universidad de Santander, Bucaramanga, Colombia
Authors: Tiria L C , Duran L M , Ardila D F 
Published: November 2019

Abstract
This study was carried out at the “Universidad de Santander”, in Bucaramanga, Colombia, to calculate the volume of rainwater capturable from the roofs of five campus buildings, as the blueprints for these surfaces were available to obtain their areas. Roof areas were first obtained for the Guane, Motilón, Arhuaco, Chibcha and Yariguíes buildings, from which rainwater can be captured. Intensity, duration, and frequency curves from the “Instituto de Hidrología, Meteorología y Estudios Ambientales” were then used to calculate a design flow, yielding the diameter of the pipe necessary to evacuate the water captured. In addition, data from the “Universidad de Santander” meteorological station was evaluated to obtain monthly rainfall figures. The highest-yielding structure was the Motilón building, with approximately 80 m3 in the months of May and November, 2018, as this structure has the largest roof area, and the area experienced its greatest quantity of rain during these months. The total accumulation predicted by the study was 1837.96 m3 annually, sufficient to suggest the possibility of its use in restrooms, gardens, and floor washing at the “Universidad de Santander”, Bucaramanga, Colombia. The volume of water calculated is variable on a yearly basis, and was estimated by means of one year of rainfall readings from the university’s meteorological station. Hydraulic structures designed for the purpose of capturing this water would require a specific study, taking into account the records of other nearby meteorological stations, and making necessary provision for the storage of water in excess of expected volumes.
Energetics of domain wall in magnetic nanowire
Authors: Trushin Oleg , Barabanova Natalia 
Published: November 2019

Abstract
Micromagnetic modeling is used to study the energetics of magnetic switching of single-layer permalloy nanowire. The energy landscape of the system is studied using Nudged Elastic Band method. It has been shown that presence of rectangular shape defects on long side and inside nanowire leads to the appearance of local maxima and minima on the energy profile. Thus artificially created imperfections can be used for effective DW pinning.
Ordering and frustrations in generalized Ising chain
Authors: Tsuvarev E S , Kassan-Ogly F A , Proshkin A I 
Published: November 2019

Abstract
The Ising model on a one-dimensional monoatomic equidistant lattice with different nearest-neighbour and second-neighbour exchange interactions is researched. Generalized Kramers-Wannier transfer-matrix with translation on two periods of a lattice is introduced. A property similar to supercooling and superheating is detected. At the triple points phases are not individualized, but completely frustrated which corresponds to the phenomenon of critical opalescence. Exact analytical expressions for free energy, heat capacity and entropy including zero-temperature entropy are obtained. Various new special cases were analyzed and compared with all known results. All frustration fields for magnetization, frustration values for the zero-temperature entropy and magnetization are found.
Monte Carlo simulations of Heisenberg magnets by the Wang-Landau method
Authors: Lozhnikov V E , Prudnikov P V , Mamonova M V , Sorokin A V , Baksheev G G 
Published: November 2019

Abstract
In this work, we investigate the critical behavior of the three dimensional Heisenberg model by parallel Wang-Landau algorithm developed with using of the OpenMP technology.
Template synthesis of different metal nanowires with applying of magnetic field
Authors: Cherkasov D , Doludenko I , Artemov V , Panov D , Zagorskiy D , Bedin S , Khaibulin R 
Published: November 2019

Abstract
This paper presents an investigation of electrodeposition of metal in pores of track etched membranes in presence of magnetic field. Where were obtained as homogeneous and heterogeneous nanowires. There is shown that magnetic field affects both on deposition process and on structure of metal nanowires. Particularly, samples obtained were investigated with help of methods of scanning electron microscopy, X-ray analysis and magnetometry.
Effect of temperature on the exchange bias in FeMn/X/Fe20Ni80 (X = Ta, Gd) films
Authors: Adanakova O A , Lepalovskij V N , Stepanova E A , Vas’kovskiy V O 
Published: November 2019

Abstract
The influence of temperature on the exchange bias in the Fe50Mn50/X/Fe20Ni80 (X = Ta, Gd) films was investigated. It is shown that in the film structures without a spacer between FeMn and permalloy layers, the temperature dependence of the value of the exchange bias field is non-monotonous. The introduction of an ultrathin spacer leads not only to a change in the magnitude of the interlayer exchange coupling, but also to a change in the behavior of its temperature dependence.
Magnetic and resonance properties of exchange spring multilayers [(CoP)soft/NiP/(CoP)hard]n
Authors: Shiyan Ya G , Patrin G S , Patrin K G , Furdyk V P 
Published: November 2019

Abstract
The magnetic resonance properties of [(CoP)soft/NiP/(CoP)hard/NiP]n exchange-spring multilayer films with a thickness of a nonmagnetic layer 4 nm have been experimentally studied in comparison to data for 2 nm thickness. A noncollinear three-sublattice magnetic structure assumed to be realized similar to the case of 2 nm NiF-layer thickness. The increase in the number of blocks n in the multilayer structure leads to the appearance of the third absorption peak, however, its intensity tends to zero at n → 20.
Identification of defects in a ferromagnet by solving the inverse problem of magnetostatics
Authors: Nikitin A V , Gobov Yu L 
Published: November 2019

Abstract
For many industries, the problem of detecting and classifying surface defects by a magnetic method is very important. Wherein the mutual configuration of magnetic converters and the object under study can be shown on the example of a device for in-pipe inspection of large-diameter pipes of gas pipelines. In this case, the magnetic transducers are located in the device inside the pipe, while the defects are located on the outer surface of the pipe. The data obtained from magnetic Hall transducers, measuring the magnetic field of scattering over the entire surface of the pipe, allows us to solve the inverse problem of magnetostatics on the restoration of magnetic fields to their sources. Due to the fact, that the pipes are made of a magnetically soft ferromagnet, it becomes possible to solve the problem of restoring the geometry of the surface corrosion defect in the metal. The proposed work contains an algorithm for reconstructing the geometry of surface defects of corrosion of an arbitrary shape from the measured magnetic scattering field over the metal surface opposite to surface, which contained the defect.
Main features of distributions of the magnetic flux leakage fields of defects different shapes
Authors: Novoslugina A P , Smorodinskii Ya G 
Published: November 2019

Abstract
The features of topography of the magnetic fields of various defects are considered using the finite element method (FEM). The distinctive attributes of these defects are identified and some recommendations are given on determining different types of defects. It is shown that extremes of the normal component of the magnetic field created by defects are closely connected with an orientation and an angle of inclination of a defect in a plate. An approach for estimating this angle of inclination of surface defects and extended subsurface defects is proposed.
Synthesis and functional characterization of poly(p-xylylene)-MnSb nanocomposite films
Authors: Oveshnikov L N , Zav’yalov S A , Streltsov D R , Chumakov N K , Trunkin I N , Nesmelov A A , Chvalun S N 
Published: November 2019

Abstract
In this study, structure and magnetic properties of poly(p-xylylene)-MnSb nanocomposite films with different inorganic filler content were investigated. The thickness of all studied films was about 200-300 nm as determined by scanning electron microscopy. It was found that the filler concentration strongly affects surface morphology of the composite films. AFM revealed that the film with the lowest MnSb content has globular surface mophology, presumably formed by polymeric grains with small MnSb nanoparticles on their surface. Ferromagnetic hysteresis loop was observed for all studied films at room temperature with the saturation magnetization values correlating with the MnSb content.
Two different types of ferromagnetic state in TiO2-Co nanopowders
Authors: Uimin M A , Privalova D V , Volegov A S , Minin A S , Konev A S , Yermakov A Ye , Gaviko V S 
Published: November 2019

Abstract
TiO2-Co nanopowders were synthesized by the sol-gel method and gas condensation method. The structure of powders and its change during various heat treatments in air and hydrogen was investigated. The samples obtained by the gas condensation method contain ferromagnetic regions in the as-prepared state. This ferromagnetism does not disappear when annealed in air at 773 K. The magnetization curves of these powders are measured in the temperature range from 2 up to 773 K and the temperature dependence of the ferromagnetic contribution is analyzed.
Observation of the inverse magnetoelectric effect in PZT/FeCuNbSiB two-layered composite structures
Authors: Efremova S L , Shalygina E E , Shalygin A N 
Published: November 2019

AbstractIn recent years, much attention has been paid to the study of magnetoelectric (ME) effects in solids, which was caused by their potential practical applications. Of particular interest are composite multiferroic materials containing ferroelectric and ferromagnetic phases, since significant ME responses may occur in them. This paper is devoted to the study of the inverse ME effect in a two-layered composite sample consisting of a piezoelectric Pb(Zr, Ti)O3(PZT) plate and an amorphous FeCuNbSiB ferromagnetic ribbon. It was found that the inverse ME effect depends on the magnitudes of the external magnetic fieldH, the electric voltageUand on the mutual orientation ofHandU.
Remanence magnetization of iron oxide particles with different size distribution
Authors: Dikansky Yu I , Ispiryan A G , Kunikin S A 
Published: November 2019

Abstract
Remanent magnetization curves for two samples of iron oxide particles with different size distributions were investigated. It was observed that the isothermal remanent magnetization curve and the DC demagnetization remanence curves are strongly depended on fine particle size. Moreover, it was figured out that remanent curves are quite complicated for the assembly of larger particles. In terms of remanence dependence analysis, it was shown that favourable interaction mechanism for the assembly of iron oxide particles strongly depends on particle size. The isothermal remanent magnetization curves were analysed in terms of the Stoner-Wohlfarth model. It leads to determine particle anisotropy field. It was found that the anisotropy field depends on particle size. It was assumed that observed differences related to different magnetic structure of particles.
Magnetostriction in ferrogels based on physical and chemical networking with embedded strontium hexaferrite particles
Authors: Safronov A P , Mikhnevich E A 
Published: November 2019

Abstract
Magnetostriction of ferrogels based on physical and chemical networking with embedded strontium hexaferrite particles was studied in 420 mT uniform magnetic field. Ferrogel with physical networking was based on natural polysaccharide – guar gum, which gelates due to formation of H-bonds. Ferrogel with chemical networking was synthesized by radical polymerization of acrylamide. Magnetostriction of the physical ferrogel resulted in the increase of length of the gel specimen along the field lines and in the proportional decrease of its width in the direction across the field lines. In case of chemical ferrogel, both the length and the width increased in the uniform magnetic field leading to the increase of the ferrogel volume.
Magnetic properties of R(Co0.88Fe0.12)2 quasi-binary compounds
Authors: Anikin M S , Tarasov E N , Kudrevatykh N V , Volegov A S , Zinin A V 
Published: November 2019

Abstract
In this paper the results of magnetic properties study for a series samples of R(Co0.88Fe0.12)2 type intermetallic compounds with a heavy rare-earth elements (R = Gd, Tb, Dy, Ho, Er) are presented. Such materials having a plateau-like temperature dependences of magnetic entropy change in the temperature range lower Curie point are considered as a promising functional materials for magnetic refrigerators. Their phase composition was controlled by X-ray diffraction analysis with a help of Bruker D8 Advance diffractometer. Magnetic field magnetization dependences – M(H) were measured using a SQUID magnetometer (MPMS-XL-7, Quantum Design) within the temperature range of 5 – 600 K in magnetic fields up to 5600 kA/m. The crystal lattice parameter – a, Curie temperature – TC
, coercivity – Hc
and residual magnetization – Mr
values are analyzed as a functions of R-element atomic number. For compounds with Tb, Dy, Ho and Er the second picks on the high field susceptibility temperature dependences – χhf
(T) were found in the temperature range lower their TC.
Electronic properties and X-ray absorption spectra of Ba1-xKxBiO3
Authors: Zhumagulov Yaroslav , Krasavin Andrey , Lukyanov Alexander , Neverov Vyacheslav , Yaroslavtsev Alexander , Menushenkov Alexey 
Published: November 2019

Abstract
The band structure, the density of states, and X-ray absorption spectra of the oxygen K-edge for perovskite high-temperature superconductors based on BaBiO3 are calculated by the density functional theory method for different levels of potassium doping in the ground and optically excited states. It is shown that changes in the properties of the electronic subsystem near the Fermi level can be correctly described by taking into account local structural inhomogeneities caused by doping and exposure to optical radiation. The appearance with doping of hole carriers on the hybridized Bi6s – O2p
σ* orbital is demonstrated, which agrees with the model of the electronic structure of bismuthate high-temperature superconductors based on a spatially separated Fermi-Bose mixture.
The dynamic processes in second generation HTS tapes under the pulsed current and magnetic impact
Authors: Anischenko I V , Pokrovskii S V , Rudnev I A 
Published: November 2019

Abstract
This paper presents the results of complex multiphysical modelling of non-equilibrium states arising in high-temperature superconducting composites under current, magnetic, and combined control switching impacts types. The simulation and analysis of the dynamics of electrophysical and thermal processes occurring in the HTS composites layered structure taking into account the influence of local thermal processes in the composite structure, in particular, heat generation bursts during a pulse, has been performed. The HTS composite switching times from the superconducting to the normal state have been investigated for various current pulses amplitudes in homogeneous magnetic fields. An experimental verification of the numerical model has been carried out.
Superparamagnetic nanopreparations in early diagnostics and treatment of cancer
Authors: Brusentsov N A , Polyanskiy VA , Golubeva I S , Baryshnikova M A , Barmashov A E , Bukreyev Yu M , Bocharova O A , Gulyayev M V , Pirogov Yu A , Anisimov N V 
Published: November 2019

Abstract
The superparamagnetic nanoparticles of magnetite citrate (SNMCs) consisting of nanospheres aggregates with the hydrodynamic diameter being between 15 to 35 nm with a magnetite core diameter of 3 to 12 nm, coated with of citrate anions was synthesized. A water 2-5% sol of SNMC was successfully tested as magnetic resonance imaging (MRI) contrast agent. The same 40% sol was then combined with Inox and used at regional magneto-thermo-chemo-therapy (RMTCT) of Lewis lung carcinoma (LLC) and Ehrlich carcinoma (EC), in female C57Bl / 6j mice. In the early stages of carcinoma development, the proliferation centers of LLC and EC cells were visualized and, during treatment, they obtained a significant increase in the efficiency of regional magneto-thermo-chemo-therapy.
Design magnetic matrices for cell technology supporting devices
Authors: Volchkov S O , Melnikov G Y , Blyakhman F A , Kurlyandskaya G V 
Published: November 2019

Abstract
Biomedical applications of magnetic materials are a hot topic of present day research. Special attention is paid for design and development of appropriate instrumentation. In this work magnetic system consisting of an equidistant set of commercial permanent magnets (6 × 4 assay) was proposed, designed and tested for further employment in the experiments in cell cultivation experiments. Magnetic field distribution was experimentally measured in 3 axes: OX, OY, OZ by gaussmeter. The results were statistically analyzed. Constant magnetic field near the center of XY plane was relatively homogeneous but at edges significant value of magnetic field gradient was observed. With increasing of Z distance, the decreasing of magnetic field strength was observed. Obtained parameters of a designed system are satisfactory and therefore it can be recommended for cell cultivation experiments when application of external magnetic field is desired.
Changes in morphotype in the population of E.coli in the presence of metal containing nanoparticles
Authors: Denisova T P , Simonova E V , Kokorina L A , Maximova E N , Safronov A P , Rommel M V , Kurlyandskaya G V 
Published: November 2019

Abstract
The level of variability of the E.coli morphotype under the influence of iron oxide nanoparticles (MNPs) depending on their concentration was studied as well as the adaptive capabilities of the microbial population under growth conditions was evaluated.The presence of γ-Fe2O3 nanoparticles in the cultivation fluid affects the cultural and morphological properties of the microbial population of E.coli in the process of its development. The appearance of new morphotypes of colonies and cells can be considered as a manifestation of an adaptive mechanism. A change in the morphology of the microbial cell with a high concentration of MNPs leads to abnormal growth and disruption of the division process.
GdFe2 Laves phase intermetallic system under pressure: an ab-initio study
Authors: Kokorina E E , Medvedev M V , Nekrasov I A 
Published: November 2019

Abstract
Here we perform abinitio study of Curie temperature TC
under hydrostatic pressure for intermetallic compound GdFe2. To calculate TC
for GdFe2 we applied mean-field solution of the Heisenberg model for several magnetic sublattices with DFT/LDA calculated values of necessary exchange interaction integrals and local magnetic moments. To compare with available experimental data pressure values were taken from zero up to about 70 Kbar. It corresponds to 2% compression of the volume of the unit cell. In agreement with experimental data
TC grows under pressure. It was shown that Fe ions magnetic sublattice alone provides only about 75% of the experimental Curie temperature TC
exp. Gd sublattice is found to give very weak contribution to the TC
exp. Here we show that the missing 25 % of TC
exp
comes from Fe-Gd exchange pairs.