Materials Literature
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Les éléments minéraux contenus dans les eaux jouent un rôle important dans la croissance et la structure des biofilms élaborés en eaux douces. De plus, les concentrations en minéraux contenus dans les biofilms dépendent de leurs concentrations dans les eaux et sont susceptibles d'évoluer. Ces éléments minéraux peuvent…
Al comencament de lany 1943, Carl Faust, el creador del Jardi Botanic Marimurtra de Blanes, va encetar una etapa daccio discreta per afavorir un jove naturalista desconegut, pero prometedor, que acabava de publicar un llibre sobre plancton: Ramon Margalef. Els anys seguents la relacio amb Margalef va resultar decisi…
This investigation involves the comparison of results achieved from three types of crystal growth of germanium and germanium-silicon alloys: (1) Float zone growth (2) Bridgman growth (3) Detached Bridgman growth crystal The fundamental goal of the proposed research is to determine the influence of containment on the p…
Polyurethane foams are extensively used in different applications such as furnitures and sandwich structures due to better mechanical properties, higher acoustic and damping behavior, higher resistance to hydrocarbon, and aging.With respect to flammability of polyurethane materials and safety precaution in living and…
The thermal conditions and the treatment of the liquid metal for centrifugal casting of pipes lead to the solidification of the melt in the form of spheroidal graphite (SG) iron throughout the thickness. However it is sometimes observed zones that are solidified within the white mode (eutectic austenite / cementite) m…
La corrosion localisee des alliages d'aluminium a pu etre reliee qualitativement au role de la microstructure, des phases intermetalliques (IM) en particulier, qui provoquent la sensibilisation a la corrosion localisee des alliages d’aluminium contenant par exemple du cuivre. Mais un effort de modelisation est necessa…
The strength of metals, and therefore their maximum operating temperature, can be improvedby oxide dispersion strengthening (ODS). Numerous research studies are carried out at the French Atomic Energy Commission (CEA) in order to develop a cladding tube material for Gen IV nuclear power reactors. Oxide dispersion stre…
In the scope of designing future nuclear fusion reactors, a clear understanding of the plasma-wall interaction is mandatory. Indeed, a predictive estimation of heat flux impacting the surface and the subsequent emission of impurities from the wall is necessary to ensure material integrity and energy confinement perfor…
s attention that the tone of the Concept may mislead the readers in understanding the development of ambient pressure X-ray photoelectron spectroscopy (APXPS).
This work is dedicated to the study of the structural and dynamical behavior of a model one-dimensional system over a wide temperature range: carbon nano-peapods. This compound is constituted of fullerenes (C60, in our case) inserted inside single-walled carbon nanotubes. The perfect match between the inner diameter o…
An Adiabatic Shear Band (ASB) is a relatively narrow band presenting large deformation and high temperature, occuring in various ductile materials. It is well established that ASBs can cause mesh dependence in the numerical simulation of this localization phenomenon. In this respect, several discontinuous models have…
The ultimate goal of this study is to examine the feasibility of extracting silicon from silica through electrolysis. The objective of the thesis was to evaluate the physico-chemical properties of a cryolite-lithium fluoride mixture as an electrolyte for the electrolysis process. A study of 86.2wt%Cryolite and13.8wt%L…
TerraPower LLC is designing a fast breed and burn reactor intended to operate for up to 40 years without refueling, designated as the Travelling Wave Reactor (TWR). Various U-Zr alloy fuel designs have been proposed for the TWR that may require a powder feed for fabrication. A simple and economic option for laboratory…
La conformabilidad de chapas metalicas suele evaluarse mediante los diagramas FLD (Forming Limit Diagrams), que informan sobre el limite de conformado de un material representado por la curva FLC (Forming Limit Curve). Estos diagramas y curvas han sido empleados durante anos para estudiar la conformabilidad de un mate…
Using ab initio evolutionary simulations, we explore all the possible stoichiometries for Mg-O system at pressures up to 850 GPa. In addition to MgO, our calculations find that two extraordinary compounds MgO2 and Mg3O2 become thermodynamically stable at 116 GPa and 500 GPa, respectively. Detailed chemical bonding ana…
Corrosion in an amine-based carbon dioxide (CO2) absorption process is one of the most serious operational problems affecting both plant safety and economics. Corrosion inhibitors are widely applied for corrosion control, mainly due to their adaptability. However, the most effective corrosion inhibitors are generally…
Used in many domains, piezoelectric materials are frequently submitted to external or internal stresses which modify their properties. In order to prevent and anticipate these modifications, this work studies the properties of piezoelectric materials under static electrical or mechanical stress. First, the motion equa…
Les materiaux ceramiques sont des composants incontournables dans les blindages antibalistiques multicouches. Leur faible densite, typiquement deux a trois fois inferieure a celle de l’acier, combinee a une tres haute resistance en compression les rends essentiel pour des applications d’armures legeres. Le carbure de…
The human skin plays an important role in people's lives. It is in constant interaction with the environment, clothing and consumer products.
Developments in mesoporous ceramics in drug delivery, nanomedicine, and bone tissue regeneration have opened promising developments in biomedical research, many applicable in the clinic in the near future. Due to the ability to fine-tune the physicochemical properties of these materials, the field has experienced an i…