Search results for "materials engineering"
showing 10 items of 69 documents
Élites campesinas en el entorno de la ciudad de Valencia: los Castrellenes
2017
This paper seeks to analyse economy of a well-to-do peasant family settled in the urban fringes of the city of Valencia, capital of the kingdom, in the first half of fifteenth Century. The death of the head of the family, due to the plague, made emerge the solidarity of the relatives, who took care of the orphans. Thanks to the memorial of rents we can assess the economic strategies of a wealthier peasant family, the importance of markets and the city and countryside relations.
Sexism, romantic love and gender inequality. A study of Latin American adolescents living in Spain
2019
Este trabajo examina el papel de los factores sociodemográficos como determinantes de las creencias y actitudes sexistas y las percepciones distorsionadas sobre el amor romántico, y analiza la relación entre el sexismo hostil y el sexismo benevolente y las creencias en mitos del amor romántico, según el Índice de Desigualdad de Género (idg), en una muestra de 203 adolescentes latinoamericanos residentes en Valencia (España). This paper examines the role of socio-demographic factors determining both sexist beliefs and attitudes and distorted perceptions of romantic love. Moreover, the relationship between hostile and benevolent sexism, and the belief in myths about romantic love is analyzed …
Sin título
2019
El presente artículo aborda una investigación cualitativa rigurosa cuyos resultados reflejan las causas que generan la vulnerabilidad de niños y adolescentes ante la influencia de las pandillas y cómo estos pasan de víctimas a victimarios. Se describe el papel que juegan los adolescentes en las principales pandillas y los factores que inciden en la responsabilidad del Estado sobre la desprotección de la niñez y la adolescencia. This article addresses a rigorous qualitative research whose results reflect the causes that generate the vulnerability of children and adolescents to the influence of gangs and how they pass from victims to victimizers. It describes the role played by adolescents in…
Improved antifouling properties and selective biofunctionalization of stainless steel by employing heterobifunctional silane-polyethylene glycol over…
2016
AbstractA straightforward solution-based method to modify the biofunctionality of stainless steel (SS) using heterobifunctional silane-polyethylene glycol (silane-PEG) overlayers is reported. Reduced nonspecific biofouling of both proteins and bacteria onto SS and further selective biofunctionalization of the modified surface were achieved. According to photoelectron spectroscopy analyses, the silane-PEGs formed less than 10 Å thick overlayers with close to 90% surface coverage and reproducible chemical compositions. Consequently, the surfaces also became more hydrophilic, and the observed non-specific biofouling of proteins was reduced by approximately 70%. In addition, the attachment of E…
Wannier90 as a community code: new features and applications
2019
Wannier90 is an open-source computer program for calculating maximally-localised Wannier functions (MLWFs) from a set of Bloch states. It is interfaced to many widely used electronic-structure codes thanks to its independence from the basis sets representing these Bloch states. In the past few years the development of Wannier90 has transitioned to a community-driven model; this has resulted in a number of new developments that have been recently released in Wannier90 v3.0. In this article we describe these new functionalities, that include the implementation of new features for wannierisation and disentanglement (symmetry-adapted Wannier functions, selectively-localised Wannier functions, s…
Gas bubbles and liquid metal flow influenced by uniform external magnetic field
2017
Permanent magnet centrifugal pump for liquid aluminium stirring
2016
In liquid aluminium processing, it is important to ensure continuous mixing of the molten metal to ensure temperature and composition homogeneity, and to improve degassing of the metal. Aluminium and its alloys are often processed in special degassing chambers after preparation in order to avoid segregation and to improve material structure, and to avoid gas pores. This extra step increases material costs and may cause material contamination. In this article, we present the idea to use centrifugal permanent magnet stirrer to induce liquid aluminium motion through thick furnace wall by creating high-speed local liquid metal jet. Analytical estimation, numerical modelling and experimental tes…
Permanent magnet dipole stirrer for aluminium furnaces
2018
Use of permanent magnet systems for metallurgical applications have been proposed before. We have continued development of such systems by investigation use of single magnetic dipole which is realized as permanent magnet cylinder. Magnet is magnetized orthogonal to its axis and has been mounted to the side of the liquid metal reservoir. System first was modelled using small scale experiment with galinstan melt. Velocity distributions and flow patterns in reservoir using Ultrasound Doppler Anemometer were acquired and will be presented here. Additionally, numerical model using Comsol and Cenos modelling software were developed alongside analytical, non-dimensional estimation calculations. Ex…
Numerical and experimental study of liquid metal stirring by rotating permanent magnets
2018
In this work, we study liquid gallium stirring by rotating permanent magnets. We demonstrate possibility of easily creating different flow patterns by rotating permanent magnets, which can be industrially important for controlling heat and mass transfer processes in the system. Unlike the typical approach of simulating magnet rotation as a transient problem and time-averaging the Lorentz forces, we solve the magnet rotation as a harmonic (frequency domain) problem, which leads to forces equal to time-averaged ones and decreases the simulation time considerably. Numerical results are validated using qualitative flow structure results from the neutron radiography visualization of tracer parti…
Local uniqueness of the solutions for a singularly perturbed nonlinear nonautonomous transmission problem
2020
Abstract We consider the Laplace equation in a domain of R n , n ≥ 3 , with a small inclusion of size ϵ . On the boundary of the inclusion we define a nonlinear nonautonomous transmission condition. For ϵ small enough one can prove that the problem has solutions. In this paper, we study the local uniqueness of such solutions.