Materials Literature
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Using a density matrix formulation for the effective action, we obtain a set of macroscopic equations that describe spin accumulation in a non-homogeneous ferromagnet. We give a new expression for the spin current which extends previous work by taking into account the symmetry of the ferromagnetic state through a care…
Abstract The description and identification of corrosion products formed on archaeological iron artefacts need various approaches at different observation scales. For this study, samples from five sites were prepared using two techniques. The first consists in cutting cross‐sections perpendicular to corrosion layers.…
The layered sodium cobalt oxide ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ is studied by electron diffraction for a wide range of sodium contents, $0.15<x<0.75$. An extensive series of ordered $\mathrm{Na}$ ion-$\mathrm{Na}$ vacancy superlattices is found beyond the simple hexagonal average structure. The most strong…
The Seebeck coefficient of a metal is expected to display a linear temperature dependence in the zero-temperature limit. To attain this regime, it is often necessary to cool the system well below 1 K. We put under scrutiny the magnitude of this term in different families of strongly interacting electronic systems. For…
We present results on numerical simulations of an atomistic system undergoing plastic shear flow in the athermal, quasistatic limit. The system is shown to undergo cascades of local rearrangements, associated with quadrupolar energy fluctuations, which induce system-spanning events organized into lines of slip oriente…
SBA-16 mesoporous silicas with cubic Im 3 m structure were synthesized using Pluronic F127 poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) triblock copolymer (EO 106 PO 70 EO 106 ) and its blends with Pluronic P123 triblock copolymer (EO 20 PO 70 EO 20 ) as supramolecular templates. The resulting mater…
The thermal and catalytic decomposition of urea over a fixed-bed flow reactor system has been examined for the selective catalytic reduction (SCR) of NO x from mobile sources. The conversion of urea into NH 3 and HNCO, the two major products from the thermal decomposition of urea, increased with the reaction temperatu…
Nanoparticles may contain unusual forms of structural disorder that can substantially modify materials properties and thus cannot solely be considered as small pieces of bulk material. We have developed a method to quantify intermediate-range order in 3.4-nanometer-diameter zinc sulfide nanoparticles and show that str…
Atrial Fibrillation Atrial fibrillation (AF), the chaotic and disorganized activity of the upper chambers of the heart, is the most common cardiac rhythm disturbance. It affects approximately 1% of the US population, or almost three million people. It occurs more frequently in the aged, affecting about 5% of people ov…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
We derive a new expression for the supersymmetric Schur polynomials sλ(x/y). The origin of this formula goes back to representation theory of the Lie superalgebra gl(m|n) and gives rise to a determinantal formula for sλ(x/y). In the second part, we use this determinantal formula to derive new expressions for the dimen…
To investigate the microstructural development and corresponding texture evolution during repeated shear deformation, specimens of AA 3003 Aluminium alloy were deformed by continuous confined strip shearing based on equal channel angular pressing. Strip specimens were deformed by the shear forming process during up to…
XM-19 stainless steel (ASME SA479; UNS S20910) was used as a structure material of a light water reactor as an alternative material of Type 304 (UNS S30400) stainless steel. XM-19 stainless steel is an attractive alternate to Type 304 stainless steel for these applications and was developed specifically as a high-stre…
We present a study of dislocations in decagonal Al70Ni21Co9 quasicrystals by means of diffraction contrast analysis as well as convergent-beam electron diffraction in the transmission electron microscope. The nickel-rich Al–Ni–Co quasicrystals show diffraction patterns characteristic of the basic-nickel decagonal phas…
Abstract: The Eco-efficiency Parametric Screening (EcoPaS) methodology, described in this paper, offers a systematic approach to component selection based on environmental impact minimisation. Starting from functional systems requirements, which are known in a very early design stage and often form part of the task sp…
This paper discusses the effects of strain rate and temperature on the mechanical response and microstructure of annealed plain medium carbon steel S50C subjected to compressive deformation by the split Hopkinson pressure bar. It is found that the flow stress increases with strain rate but decreases with temperature.…
Au cours des procédés de fabrication utilisant le PET (Poly-éthylène Téréphthalate) les déformations biaxiales vécues par le matériau induisent des changements importants de sa microstructure. La compréhension de ces modifications est cruciale pour permettre la mise au point de modèles prédictifs des caractéristiques…
Magnetoresistance has been studied in LaFe/sub 11.2/Co/sub 0.7/Si/sub 1.1/ compound. The ferromagnetic ordering at Curie temperature T/sub C/ of 274 K was found being accompanied by a drastic negative lattice expansion due to the strong structural and magnetic interplay. Such a simultaneous magnetic and lattice change…
The CO2 reforming of CH4 was carried out over Ni catalysts supported on -Al2O3 and CeO2-promoted -Al2O3. The catalysts were characterized by means of surface area measurements, TPR, CO2 and H2 chemisorption, XRD, SEM, and TEM. The CeO2 addition promoted an increase of catalytic activity and stability. The improvement…
Polyvinyl alcohol (PVA) has been chemically modified to its carboxymethylated form and the product, designated as CPVA are cast into transparent films. It was observed that the mechanical strength of CPVA film was much higher than that of PVA. The wide angle X-ray diffraction (WAXD) pattern showed a higher molecular o…