82 documents found, page 1 of 9
La educomunicación como forma de empoderar a la ciudadanía digital. El caso de ...
Alvites-Huamaní, Cleofé-Genoveva; Vásquez Salazar, Erika; Martins, Ricardo; Caldeiro-Pedreira , Mari-CarmenLa cultura digital protagoniza el momento actual y en ella se desarrolla la ciudadanía digital. En este contexto se establecen ciertos patrones de comportamiento que definen determinadas actuaciones de los usuarios de la red. Concretamente, en el contexto educativo de la zona de la selva peruana se ha realizado un estudio de diseño no experimental descriptivo en el que se obtiene información relativa a la autop...
Thermal Stability and Irradiation Resistance of (CrFeTiTa)70W30 and VFeTiTaW Hi...
Pereira, André; Martins, Ricardo; Monteiro, Bernardo; Correia, Jose B.; Galatanu, Andrei; Catarino, Norberto; Jenus, Petra; Dias, MartaABSTRACT: Nuclear fusion is a promising energy source. The International Thermonuclear Experimental Reactor aims to study the feasibility of tokamak-type reactors and test technologies and materials for commercial use. One major challenge is developing materials for the reactor's divertor, which supports high thermal flux. Tungsten was chosen as the plasma-facing material, while a CuCrZr alloy will be used in t...
Influence of Cr on the quaternary FeTaTiW medium entropy alloy
Martins, Ricardo; Monteiro, Bernardo; Pereira Gonçalves, Antonio; Correia, Jose B.; Galatanu, Andrei; Alves, Eduardo; Tejado, ElenaABSTRACT: The search for advanced materials has been growing, and high entropy alloys (HEAs) are emerging as promising candidates for application in the fusion domain. This work investigates the effect of Cr on the FeTaTiW medium entropy alloy to form (CrFeTaTi)70W30 high entropy alloy, comparing the experimental production and characterization with the simulation (molecular dynamics and hybrid molecular dynami...
Hepatic Artery Variation and Its Impact on Cephalic Duodenopancreatectomy: A Ca...
Figueiredo, Arnaldo; Porto, Martim; Simões, João; Santos, Miguel; Martins, RicardoVariations in the anatomy of the hepatic artery are frequent and are of great importance in the surgical planning of patients undergoing procedures involving the hepatobiliary and pancreatic systems. We present the case of a patient who underwent cephalic pancreaticoduodenectomy for adenocarcinoma of the head of the pancreas, which presented with a common hepatic artery originating from the superior mesenteric ...
Distinct oscillatory patterns differentiate between segregation and integration...
Costa, Gabriel Nascimento; Schaum, Michael; Duarte, João Valente; Martins, Ricardo; Duarte, Isabel Catarina; Castelhano, João; Wibral, MichaelRecently, there has been a resurgence in experimental and conceptual efforts to understand how brain rhythms can serve to organize visual information. Oscillations can provide temporal structure for neuronal processing and form a basis for integrating information across brain areas. Here, we use a bistable paradigm and a data-driven approach to test the hypothesis that oscillatory modulations associate with the...
Simulation and study of the milling parameters on CuFeTaTiW multicomponent alloy
Martins, Ricardo; Gonçalves, António Pereira; Correia, J.B.; Galatanu, Andrei; Alves, E.; Dias, MartaABSTRACT: The CuFeTaTiW multicomponent alloy has been devised as an interlayer thermal barrier in nuclear fusion re-actors. In order to predict the phase constitution of this alloy, two different lines of work were performed: (a) simulation using Molecular dynamics and Monte Carlo and (b) study of the influence of mechanical alloying parameters on the structures formed. The simulation results show that the most...
Simulation, Structural, Thermal and Mechanical Properties of the FeTiTaVW High ...
Martins, Ricardo; Gonçalves, António Pereira; Correia, J.B.; Galatanu, Andrei; Alves, E.; Tejado, Elena; Pastor, Jose Ygnacio; Dias, MartaABSTRACT: Developing new materials to be applied in extreme environments is an opportunity and a challenge for the future. High entropy alloys are new materials that seem promising approaches to work in nuclear fusion reactors. In this work, FeTaTiVW high entropy alloys were developed and characterized with Molecular Dynamic and Hybrid Molecular Dynamic Monte Carlo simulations. The simulation results show that ...
High spatiotemporal resolution free surface detection using cost-effective vide...
Martins, Ricardo; Isidoro, Jorge; Lima, João L. M. P. deThe identification of the air-water interface in free surface flows traditionally involves intrusive techniques or costly equipment. Non-intrusive alternatives, such as computer vision, are emerging as highly effective substitutes or supplements for more invasive techniques in laboratory measurements, thanks to their straightforward implementation and cost efficiency. This research specifically delves in the co...
DIPNECH: Um Diagnóstico Diferencial a Considerar no Contexto Oncológico
Rodrigues, Susana Lopes; Martins, Ricardo; Freixo, Beatriz; Duarte, Hálio; Fonseca, DiogoA hiperplasia difusa idiopática de células neuroendócrinas do pulmão (DIPNECH) é uma doença rara, com maior incidência nas mulheres. É caracterizada pela proliferação de células neuroendócrinas na parede do brônquio, sendo parte do espetro de tumores neuroendócrinos do pulmão. É considerada uma lesão pré-invasiva para tumores carcinóides. Os pacientes podem ser assintomáticos ou apresentar-se com sintomas inesp...
Irradiation damage on CrNbTaVWx high entropy alloys
Martins, Ricardo; Correia, J.B.; Czarkowski, P.; Miklaszewski, R.; Malaquias, A.; Mateus, R.ABSTRACT: CrNbTaVWx high-entropy alloys have been developed for plasma facing components to be applied in nuclear fusion reactors. The CrNbTaVWx (x = 1 and 1.7) compositions were prepared by ball milling and consolidated at 1600 degrees C under 90 MPa. To study the irradiation resistance of these materials, deuterium plasmas were used to irradiate the samples in the PF-1000U facility with 1 and 3 discharges. St...