Proposal of a novel design for linear superconducting motor using 2G tape stacks

This paper presents a new design for a su- perconducting linear motor (SLM). This SLM uses stacks of second-generation (2G) superconducting tapes, which are responsible for replacing yttrium barium copper oxide bulks. The proposed SLM may operate as a synchronous motor or as a hysteresis motor, depending on the load force magnitude. A small-scale linear machine prototype with 2G stacks was constructed and tested to investigate the proposed SLM topology. The stator traveling magnetic field wave was represented by several Nd-Fe-B permanent magnets. A relative movement was produced between the stator and the stack, and the force was measured along the displacement. This system was also simulated by the finite element method, in order to calculate the induced currents in the stack and determine the electromagnetic force. The H-formulation was used to solve the problem, and a power law relation was applied to take into account the intrin- sically nonlinearity of the superconductor. The simulated and measured results were in accordance. Simulated re- sults were extrapolated, proving to be an interesting tool to scale up the motor in future projects. The proposed motor presented an estimated force density of almost 500 N/kg, which is much higher than any linear motor.This work was supported in part by the following agencies: CNPq/CAPES/INERGE, CNPq—Ci ˆ encias sem Fronteiras, FAPERJ, Catalan Government 2014- SGR-753, CONSOLIDER Excellence Network MAT2014-56063-C2-1-R and MAT2015-68994-REDC, Eurofusion EU COST ACTIONS MP1201/ MP1014/PPPT-WPMAG 2014, EUROTAPES FP7-NMP-Large-2011- 280432, FORTISSIMO FP7-2013-ICT-609029, and Spanish Govern- ment Agencies—Severo Ochoa Programme Centres of Excellence in R&D. (Corresponding author: Guilherme G. Sotelo.

H-Formulation FEM Modeling of the Current Distribution in 2G HTS Tapes and Its Experimental Validation Using Hall Probe Mapping

One of the most widespread mathematical formulations applied to simulate the electromagnetic phenomena of coated conductor in the recent literature is the H one. However, the only validation of the model has been indirect by using measurements taken from the applications, as measurements of the energy losses in ac fields, forces developed in levitation systems or any other parameter related to a specific application. Direct validation of the calculation requires the observation of the local out of plane magnetic field over the surface of the sample and this is only accessible under magneto-optical observations and, in a larger scale and better dynamic range, by the Hall scanning microscopy. We propose here the experimental validation of the H-formulation by comparing the simulated results with measurements made by a Hall probe mapping in a second generation (2G) tape sample for several DC transported currents at 77 K. The paper presents a methodology to simulate the 2G tape by using only measured data obtained from a sample and its normalized J(B) experimental curves. Some boundary conditions that allow a faster convergence of the problem are investigated. Simulated results of the 2G tape modelled considering only the 1 μm HTS layer were compared with other that represent the most important layers of the coated conductor structure in the calculations. The simulated and measured results present a good agreement, proving that this model can calculate precisely the magnetic field and, hence, the current distribution in HTS samples.This work was supported in part by the followings grants: “Science Without Borders” from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); by the European Agency (EU) through the Factories of the Future Resources, Technology, Infrastructure and Services for Simulation and Modelling (FORTISSIMO) Project under Grant EU FP7-2013-ICT-609029, the European Development of Superconducting Tapes (EUROTAPES) Project under Grant EU-FP7 NMP-LA-2012- 280432, the European Consortium for the Development of Fusion Energy (EUROfusion, PPPT-WPMAG 2014), and EU COST ACTIONS MP1201 and MP1014; by the Spanish Ministry of Economy and Competitiveness through the “Severo Ochoa” Programme for Centres of Excellence in R&D under Grant SEV-2015-0496, CONSOLIDER Excellence Network under Grant MAT2015- 68994-REDC, COACHSUPENERGY project under Grant MAT2014-56063- C2-1-R, co-financed by the European Regional Development Fund; by the Catalan Government under Grant 2014-SGR-753 and Xarmae

Hall effect in laser ablated Co_2(Mn,Fe)Si thin films

Pulsed laser deposition was employed to grow thin films of the Heusler compounds Co_2MnSi and Co_2FeSi. Epitaxial growth was realized both directly on MgO (100) and on a Cr or Fe buffer layer. Structural analysis by x-ray and electron diffraction shows for both materials the ordered L2_1 structure. Bulk magnetization was determined with a SQUID magnetometer. The values agree with the Slater-Pauling rule for half-metallic Heusler compounds. On the films grown directly on the substrate measurements of the Hall effect have been performed. The normal Hall effect is nearly temperature independent and points towards a compensated Fermi surface. The anomalous contribution is found to be dominated by skew scattering. A remarkable sign change of both normal and anomalous Hall coefficients is observed on changing the valence electron count from 29 (Mn) to 30 (Fe).Comment: 9 pages, 6 figures submitted to J Phys

Evaluación de los modelos de predicción del ACI-08, Eurocódigo 2 y EHE-08, para estimar las propiedades mecánicas del hormigón autocompactante

The objective of this study is to evaluate the applicability of the ACI-08, EC-2, and EHE-08 models for the estimating of the mechanical properties of self-compacting concrete (SCC). The mechanical properties considered are the modulus of elasticity, tensile strength, and modulus of rupture. In order to statistically evaluate the applicability of the models it was necessary to compile an extensive database that included the experimental results for the various mechanical properties analyzed and the exact dosifications of the mixtures. The first part of the study includes an analysis of each one of the models, together with a regression analysis in order to evaluate the behavior and the adaptability to the different models. The specific characterization parameters for each concrete mixture were used to calculate the various mechanical properties applying the different estimation models. The second part of the analysis consisted in comparing the experimental results with the estimated results for all the mixtures in order to evaluate the applicability of these models to SCC.El presente trabajo de investigación tiene como finalidad estudiar la aplicabilidad de los modelos de cálculo del ACI-08, Eurocódigo 2 y de la EHE-08 utilizados para la estimar las propiedades mecánicas del hormigón convencional, en el hormigón autocompactante. Las propiedades mecánicas estudiadas han sido: el módulo de deformación, la resistencia a tracción y la resistencia a flexotracción. Para llevar a cabo la investigación fue necesario construir una extensa base de datos que permitiera albergar en ella una gran cantidad de dosificaciones de hormigón autocompactante y un amplio rango de valores de sus propiedades mecánicas para lograr una muestra lo más representativa posible. En primera instancia se comparó el comportamiento de cada uno de estos modelos normativos de cálculo, con la curva de regresión de los datos obtenidos para el hormigón autocompactante, observando su comportamiento y adaptabilidad a los distintos modelos normativos. Posteriormente se compararon los valores experimentales y los valores medidos para estudiar la aplicabilidad de estos modelos normativos de cálculo del hormigón convencional en el hormigón autocompactante

NICEST - Master Study Proposal on Next Generation Industrial Control Engineering for Sustainable Water System Treatment

[EN] In this paper a collaborative experience towards the development of a new joint master degree is presented. The design of the curriculum has as main pillars: a) to provide an interdisciplinary view and approach to advanced water treatment solutions, and b) the development of the curriculum is done according to the new challenges for Higher Education in Europe, therefore providing references of good practices with this respect. The experience is worth to be shared as in an immediate future the expected collaboration among Higher Education Institutions in Europe is to increase if an integrated and high quality Higher Education Area is to be developed. The ongoing reviewing/re-structuring process of higher education programmes provides the opportunity to promote new types and levels of learning new technologies and practices in and through pan-European collaboration. The proposal that is motivated by the need for a green approach to water treatment. Like many other industries, water and wastewater treatment plants also face the problem of a staffing shortage. Efficient and productive workers that are skilled in the business are necessary to properly manage water systems. Automation may be a potential solution to this shortage. Not only will it fill in the gaps of needed employment, but it will also put less stress on existing workers. To this aim the Next generation Industrial Control Engineering for Sustainable water system Treatment (NICEST) project is presented in this paper. © (2023) by ECOS 2023 All rights reserved.SICommission Erasmus+ Erasmus Mundus Design Measure ERASMUS-EDU-2022-EMJM-DESIGN 101082541 European Commission European Unio

Merata and Whakapapa: expanding notions of (auto)biography through Māori lenses

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The pathogenesis of Staphylococcus epidermidis biofilm-associated infections: the host and the pathogen perspective

Book of Abstracts of CEB Annual Meeting 2017info:eu-repo/semantics/publishedVersio