João P. Araújo
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View article: Methodology for Assessing Ports as Testbeds for Emerging Sustainable Wave Energy Technologies: Application to Sines Port with the REEFS WEC
Methodology for Assessing Ports as Testbeds for Emerging Sustainable Wave Energy Technologies: Application to Sines Port with the REEFS WEC Open
The development of wave energy converters (WECs) requires experimental tests at increasing scales. During the process, wave tanks eventually become inadequate due to size limitations. This study proposes a structured methodology to assess …
View article: Contagem de cloroplasto em células-guarda como método indireto para determinação da ploidia em plantas: revisão
Contagem de cloroplasto em células-guarda como método indireto para determinação da ploidia em plantas: revisão Open
A determinação do nível de ploidia é uma etapa essencial em programas de melhoramento genético, pois possibilita confirmar eventos de duplicação cromossômica e a formação de híbridos interespecíficos. Embora métodos diretos sejam precisos,…
View article: Retargeting Matters: General Motion Retargeting for Humanoid Motion Tracking
Retargeting Matters: General Motion Retargeting for Humanoid Motion Tracking Open
Humanoid motion tracking policies are central to building teleoperation pipelines and hierarchical controllers, yet they face a fundamental challenge: the embodiment gap between humans and humanoid robots. Current approaches address this g…
View article: Exploring the interplay of Ti-Sn co-doping in photoelectrochemical water splitting of hematite nanowires
Exploring the interplay of Ti-Sn co-doping in photoelectrochemical water splitting of hematite nanowires Open
Photoelectrochemical water splitting is a promising alternative for sustainable energy production, addressing the growing need for clean energy sources. Hematite is a potential semiconductor for this process due to its abundance, low cost,…
View article: Exploring the Volatility, Phase Transitions, and Solubility Properties of Five Halogenated Benzaldehydes
Exploring the Volatility, Phase Transitions, and Solubility Properties of Five Halogenated Benzaldehydes Open
Halogenated benzaldehydes possess unique chemical properties that render them valuable in pharmaceutical synthesis, pesticide formulation, and dye production. However, thorough thermodynamic data for these compounds remain scarce. This stu…
View article: Spin waves in Co2FeGe films
Spin waves in Co2FeGe films Open
The dynamic magnetic properties of full Heusler alloy thin films of Co2FeGe, grown on MgO (001) substrates under different thermal conditions, were investigated. Brillouin light scattering and ferromagnetic resonance measurements revealed …
View article: Anisotropic Porous Iron-Based Nanoparticles through Two-Step Hydrothermal and Hydrogen-Based Reduction: Enhanced Magnetic Performance for Potential Biomedical Applications
Anisotropic Porous Iron-Based Nanoparticles through Two-Step Hydrothermal and Hydrogen-Based Reduction: Enhanced Magnetic Performance for Potential Biomedical Applications Open
Iron-based nanoparticles have emerged as promising candidates for diverse biomedical applications, including cell separation, targeted drug delivery, hyperthermia therapy, and magnetic resonance imaging. This study reports the scalable syn…
View article: The effect of amplification on the state of polarization over 50 km using an EDFA
The effect of amplification on the state of polarization over 50 km using an EDFA Open
This work studies the influence of an Erbium-Doped Fiber Amplifier (EDFA) on the phase variation of light in an optical fiber. To this end, the state of polarization (SOP) was measured as a function of optical power by adjusting the EDFA a…
View article: OBESIDADE INFANTIL E SEUS RISCOS
OBESIDADE INFANTIL E SEUS RISCOS Open
Este artigo tem por objetivo realizar uma pesquisa que possa demonstrar a situação da obesidade em crianças e os riscos principais, sobre os impactos de saúde na fase adulta. Foram utilizados como bases de busca os indexadores pertencentes…
View article: Spin waves in Co$_2$FeGe films
Spin waves in Co$_2$FeGe films Open
The dynamic magnetic properties of Full Heusler alloy thin films of Co$_2$FeGe, grown on MgO (001) substrates under different thermal conditions, were investigated. Brillouin light scattering and ferromagnetic resonance measurements reveal…
View article: Structural, Magnetic, and Dielectric Properties of Laser-Ablated CoFe2O4/BaTiO3 Bilayers Deposited over Highly Doped Si(100)
Structural, Magnetic, and Dielectric Properties of Laser-Ablated CoFe2O4/BaTiO3 Bilayers Deposited over Highly Doped Si(100) Open
Laser ablation was used to successfully fabricate multiferroic bilayer thin films, composed of BaTiO3 (BTO) and CoFe2O4 (CFO), on highly doped (100) Si substrates. This study investigates the influence of BaTiO3 layer thickness (50–220 nm)…
View article: Effect of Thermal Processing on the Structural and Magnetic Properties of Epitaxial Co2FeGe Films
Effect of Thermal Processing on the Structural and Magnetic Properties of Epitaxial Co2FeGe Films Open
The structure and magnetic properties of epitaxial Heusler alloy films (Co2FeGe) deposited on MgO (100) substrates were investigated. Films of 60 nm thickness were prepared by magnetron co-sputtering at different substrate temperatures (TS…
View article: Engineering a Galinstan-based ferromagnetic fluid for heat management
Engineering a Galinstan-based ferromagnetic fluid for heat management Open
View article: Comprehensive Characterization of Bi1.34Fe0.66Nb1.34O6.35 Ceramics: Structural, Morphological, Electrical, and Magnetic Properties
Comprehensive Characterization of Bi1.34Fe0.66Nb1.34O6.35 Ceramics: Structural, Morphological, Electrical, and Magnetic Properties Open
Recent research in solid-state physics and materials engineering focuses on the development of new dielectric materials, with bismuth-based pyrochlores being already extensively applied in communications technology for their excellent diel…
View article: Impact of Zn addition on structural, morphological, and magnetic properties of thermally annealed Li–Zn nanoferrite
Impact of Zn addition on structural, morphological, and magnetic properties of thermally annealed Li–Zn nanoferrite Open
The effect of Zn addition on cationic distribution, structural and magnetic properties of nanocrystalline Li-Zn ferrites are reported. X-ray diffraction confirms the formation of spinel nanoferrites with an average grain diameter of 34 − 8…
View article: Ge-based Clinopyroxene series: first principles and experimental local probe study
Ge-based Clinopyroxene series: first principles and experimental local probe study Open
The structural and electronic properties of the CaMnGe$_2$O$_6$ and SrMnGe$_2$O$_6$ clinopyroxene systems have been investigated by means of perturbed angular correlation (PAC) measurements, performed at ISOLDE, combined with $ab-initio$ e…
View article: Zinc/Magnesium Ferrite Nanoparticles Functionalized with Silver for Optimized Photocatalytic Removal of Malachite Green
Zinc/Magnesium Ferrite Nanoparticles Functionalized with Silver for Optimized Photocatalytic Removal of Malachite Green Open
Water pollution is a major environmental challenge. Due to the inefficiency of conventional wastewater treatment plants in degrading many organic complex compounds, these recalcitrant pollutants end up in rivers, lakes, oceans and other bo…
View article: Economic and Accessible Portable Homemade Magnetic Hyperthermia System: Influence of the Shape, Characteristics and Type of Nanoparticles in Its Effectiveness
Economic and Accessible Portable Homemade Magnetic Hyperthermia System: Influence of the Shape, Characteristics and Type of Nanoparticles in Its Effectiveness Open
Currently, one of the main causes of death in the world is cancer; therefore, it is urgent to obtain a precocious diagnosis, as well as boost research and development of new potential treatments, which should be more efficient and much les…
View article: Author Correction: Contactless doping characterization of Ga2O3 using acceptor Cd probes
Author Correction: Contactless doping characterization of Ga2O3 using acceptor Cd probes Open
View article: Structural dynamics of first-order phase transition in giant magnetocaloric La(Fe,Si)13: The free energy landscape
Structural dynamics of first-order phase transition in giant magnetocaloric La(Fe,Si)13: The free energy landscape Open
View article: Probing $Ca_3Ti_2O_7$ crystal structure at the atomic level: Insights from $^{111m}Cd/^{111}Cd$ PAC spectroscopy and ab-initio studies
Probing $Ca_3Ti_2O_7$ crystal structure at the atomic level: Insights from $^{111m}Cd/^{111}Cd$ PAC spectroscopy and ab-initio studies Open
Perturbed angular correlation spectroscopy combined with $ab-initio$ electronic structure calculations is used to unravel the structural phase transition path from the low-temperature polar structure to the high-temperature structural phas…
View article: Flexible Magnetocaloric Fiber Mats for Room-Temperature Energy Applications
Flexible Magnetocaloric Fiber Mats for Room-Temperature Energy Applications Open
Currently, magnetocaloric refrigeration technologies are emerging as ecofriendly and more energy-efficient alternatives to conventional expansion-compression systems. However, major challenges remain. A particular concern is the mechanical…
View article: Rotating magnetocaloric effect in polycrystals—harnessing the demagnetizing effect
Rotating magnetocaloric effect in polycrystals—harnessing the demagnetizing effect Open
Climate change and the increasing demand for energy globally have motivated the search for a more sustainable heat-pumping technology. Magnetic refrigeration stands as one of the most promising alternative technologies for clean and effici…
View article: Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction
Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction Open
4-nitrophenol (4-NPh) is a harmful compound produced in large amounts in the chemical industry, and its reduction to aminophenol (4-APh) using noble metals as catalysts is one of the most studied processes. The development of noble metal-f…
View article: Pressure-Induced Phase Transformations of Quasi-2D Sr<sub>3</sub>Hf<sub>2</sub>O<sub>7</sub>
Pressure-Induced Phase Transformations of Quasi-2D Sr<sub>3</sub>Hf<sub>2</sub>O<sub>7</sub> Open
We present an abinitio study of the quasi-2D layered perovskite Sr3Hf2O7 compound, performed within the framework of the density functional theory and lattice dynamics analysis. At high temperatures, this c…
View article: Tunable Iron–Cobalt Thin Films Grown by Electrodeposition
Tunable Iron–Cobalt Thin Films Grown by Electrodeposition Open
Iron–cobalt (FeCo) alloys are highly desirable for their exceptional and adjustable physicochemical properties, particularly in the form of thin films. This study focuses on the growth of iron–cobalt (FeCo) alloy thin films using potentios…
View article: Pressure-Induced Phase Transformations of Quasi-2D Sr$_3$Hf$_2$O$_7$
Pressure-Induced Phase Transformations of Quasi-2D Sr$_3$Hf$_2$O$_7$ Open
We present an \textit{ab-initio} study of the quasi-2D layered perovskite Sr$_3$Hf$_2$O$_7$ com\-pound, performed within the framework of the Density Functional Theory and lattice dynamics analysis. At high temperatures, this compound take…
View article: CIRCLE: Capture In Rich Contextual Environments
CIRCLE: Capture In Rich Contextual Environments Open
Synthesizing 3D human motion in a contextual, ecological environment is important for simulating realistic activities people perform in the real world. However, conventional optics-based motion capture systems are not suited for simultaneo…
View article: Key Parameters in Phototherapy with Gold Nanorods Using Continuous Near Infrared Radiation
Key Parameters in Phototherapy with Gold Nanorods Using Continuous Near Infrared Radiation Open
As nanoparticle formulations move toward human clinical trials in photothermal cancer therapy (PTT), the influence of individual key parameters on the heating efficacy must be thoroughly assessed. This work reports a systematic study on th…
View article: Design and photo-Fenton performance of Graphene/CuS/Fe3O4 tertiary nanocomposites for Rhodamine B degradation
Design and photo-Fenton performance of Graphene/CuS/Fe3O4 tertiary nanocomposites for Rhodamine B degradation Open
This study describes nanocomposites of graphene flakes (GF) combined with CuS, Fe3O4 and CuS−Fe3O4 nanoparticles prepared by wet chemical methods. The Fe3O4 and/or CuS nanoparticles were directly anchored onto GF without requiring addition…