Landau's Fermi-liquid theory is the standard model for metals, characterized by the existence of electron quasiparticles near a Fermi surface as long as Landau's interaction parameters lie below critical values for instabilities. Recently this fundamental paradigm has been challenged by the physics of strong spin-orbit coupling, although the concept of electron quasiparticles remains valid near...

Abstract An Al-5Mg alloy (AA5083) block, deposited over an AA6061 substrate by wire-arc additive manufacturing, was electrochemically tested along two different cross-sectional planes cyclic polarization in 3.5 wt.% NaCl. The layers and the interlayer boundaries showed similar behavior regardless of direction. corrosion both mainly attributed to presence relatively coarse intermetallic Al(Fe, M...

Abstract Developing high‐efficiency electrocatalysts for hydrogen evolution reaction (HER) has been considered as a crucial way to reduce energy loss in water‐splitting. Herein, heterogeneous NiSe 2 /MoSe (H‐NiSe ) nanocomposite constructed by metallic nanocrystallites embedded few‐layer MoSe nanosheets situ synthesized simple hydrothermal reaction. As an HER electrocatalyst, it delivers superi...

In this article various pipes used for transporting of gas are introduced and pros and cons of each one are elucidated. The pipes are categorized in three different subgroups including metallic, polymeric and metallic-wire reinforced polymeric pipes. Metallic-wire reinforced polymeric pipes are nominated as the best option for usage in high pressure pipelines transporting natural gas. As a resu...

An important property of some metallic alloys, such as NiTi, for technological applications is their coupled thermomechanical shape memory behavior. This is due to temperature-dependent first-order displacive (martensitic) transformations in which their crystal structures transform between a higher symmetry cubic phase and lower symmetry phases (rhombohedral, tetragonal, orthorhombic, or monocl...

We studied the effects of low-energy electron beam irradiation up to 10 keV on graphene-based field effect transistors. We fabricated metallic bilayer electrodes to contact mono- and bi-layer graphene flakes on SiO₂, obtaining specific contact resistivity ρ c ≈ 19 k Ω · µ m 2 and carrier mobility as high as 4000 cm²·V-1·s-1. By using a highly doped p-Si/SiO₂ substrate as the back gate, we analy...

The fabrication and characterisation of a double-arm cantilever-type metallic DC-contact MEMS actuator with low pull-down voltage are reported. Bi-layer TiW cantilevers with an internal stress gradient were fabricated using a microwave-compatible fabrication process. Owing to its small size, cantilever length (L 1⁄4 5–50 mm) and width (W 1⁄4 2–40 mm), i.e. 10–100 times smaller in lateral dimens...

During recent years, microelectronics helped to develop complex and varied technologies. It appears that many of these technologies can be applied successfully to realize Seebeck micro generators: photolithography and deposition methods allow to elaborate thin thermoelectric structures at the micro-scale level. Our goal is to scavenge energy by developing a miniature power source for operating ...

High-resolution electron microscopy was employed to characterize the interface structure of a cast Al-Mg-Si-Bi-Pb aluminium(6262)-based composite reinforced by alpha alumina particles with a trace of beta alumina in order to investigate the behaviour of alloying elements in cast composites. Except for a few primary Mg2Si particles, few reaction products were detected at the interface of Al/alph...