Search results for "roche"

Approches quantitatives de la production de fer sur le site hallstattien de Bragny-sur-Saône (Saône-et-Loire)

2007

This study is based on an inventory of iron knives dated from the 8th to the 5th centuries BC and discovered in funerary and settlement sites in the South-West of France. The corpus consists of 608 artefacts. We established a typology allowing us to present a chronological and spatial distribution of each type. We then tried to determine the functions of the knives according to their type and their length. For those discovered in graves other objects in the grave assemblage were used as an additional criterion. When the funerary context was very clearly defined, we tried to determine the function, in the grave itself, of the knives.

Le juge d'instruction. Approches historiques

2010

Electrochemical properties of graphite/nylon electrodes additively manufactured by laser powder bed fusion

2023

Nowadays, additive manufacturing, known as 3D printing, is vigorously employed at various enterprises due to the ability of industrial series production and customization in conjunction with geometry freedom. While, material design and fabrication of composite materials, meeting the desired architecture and properties, is another promising application of additive manufacturing. For instance, additive manufacturing of the material exhibiting electrochemical properties is beneficial for the development of freestanding electrodes that might be used in electrochemical energy storage systems. Herein, the graphite/nylon composite with a high carbon ratio of 30 wt% was produced by laser powder bed…

The state of art of biological processes in paternal care

2014

This review of the state of art aimed to present the most recent data on neuronal, neurochemical, hormonal and genetic bases of paternal care using MEDLINE and PsycInfo databases (1970-2013). An integrated model of biological substrates that assist men in the transition to fatherhood is presented. Guided by a genetic background, hypothalamic-midbrain-limbic-paralimbic-cortical circuits were found to be activated in fathers when infant stimuli are presented. A set of specifi c neuropeptides and steroid hormones are produced and seem to be related to brain activation, potentiating the paternal phenotype. Together, genetic, brain and hormonal processes suggest the existence of biological bases…

Electrodeposition and characterization of Mo oxide nanostructures

2015

Template electrodeposition has been used to grow uniform arrays of molybdenum oxide nanostructures in polycarbonate membrane. Several parameters have been investigated, like electrodeposition, time and solution pH. These parameters do not influence the nature of the deposit that always consists of mixed valence molybdenum oxides, whereas the nanostructure morphology changes with pH. In particular, at low pH (2.7), nanotubes are formed, whilst arrays of nanowires are obtained above pH 5.5. This change of morphology is likely due to H2 bubbles evolution during the electrochemical deposition, particularly occurring at low pH. It was found that fast removal of H2 bubbles through vigorous stirri…

Expériences croisées face à l’épreuve de la maladie d’Alzheimer. Quand personnes malades et proches dessinent des trajectoires d’accompagnement contr…

2018

Cadre de recherche : La littérature consacrée aux familles des personnes malades d’Alzheimer met en lumière la charge que peut représenter l’accompagnement d’une personne malade, mais aussi la diversité des expériences vécues par les proches. Malgré l’abondance de littérature, deux limites sont constatées : ces travaux se fondent strictement sur le discours des proches et ils appréhendent l’expérience de l’accompagnement sur la base d’une approche synchronique.Objectifs : Cet article a l’ambition de dépasser ces deux limites en mettant en dialogue, dans la durée, les témoignages des personnes malades d’Alzheimer et de leurs proches. Nous proposons d’analyser ce qui se joue dans les dynamiqu…

Effects of hydrogen-charging on the properties of S235JR steel

2017

The paper presents the test results of the S235JR steel susceptibility to damage under the influence of hydrogen. The test of mechanical properties was performed on the basis of a static stretch test of non-hydrogenated samples and after cathodic polarization. Electrochemical measurements for the assessment of corrosion resistance of non-hydrogenated and hydrogenated steels were carried out using open circuit potential measurement and registering of potentiodynamic polarization curves in a three-electrode measuring system. Hydrogenation was carried out for between 3 and 24 hours in a solution of 0.1 N sulfuric acid (VI) with the addition of 2 mg/dm 3 of arsenic oxide (III) at an electric cu…

Direct electricity production from coconut oil - the electrooxidation of coconut oil in an acid electrolyte

2018

Supplying more and more energy is an essential task of today's energy industry. In the last few decades, in addition to traditional methods of energy production, alternative energy sources have been developing at a fast rate. One of the devices that can use these sources is the fuel cell (FC). FCs can be a power source of the future mainly due to their high efficiency, their low impact on the environment and the possibility of powering with different fuels. Most often, FCs are powered by hydrogen. However, issues with its cheap production and storage are the reasons for seeking new fuels for FCs. Yet it must be a fuel that will provide a zero or low emission level. One of these fuels can be…

Electrochemical Oxidation of Hf-Nb Alloys as a Valuable Route to Prepare Mixed Oxides of Tailored Dielectric Properties

2018

Metal oxides with high dielectric constant are extensively studied in the frame of substituting SiO2 as gate dielectric in nanoelectronic devices. Here, high-k mixed HfO2/Nb2O5 oxides are prepared by a facile electrochemical route starting from sputtering-deposited Hf–Nb alloys with several compositions. Transmission electron microscopy, grazing incidence X-ray diffraction, and glow discharge optical emission spectroscopy are employed to study the oxide structures, disclosing a crystalline–amorphous transition of the electrochemically prepared oxides by increasing the Nb content. Photo-electrochemical measurements allow the observation of optical transitions ascribed to localized states ins…

Development of ultrasound-assisted digestion methods for the determination of toxic element concentrations in ash samples by ICP-OES

2011

The present thesis introduces several ultrasound-assisted digestion methods developed for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry (ICP-OES). Ultrasound-assisted digestion is a quite new technique used for sample pre-treatment purposes, especially in difficult sample matrixes. Elements determined are As, Ba, Co, Cr, Cu, Ni, Pb, Sb, Sr, V, and Zn. Most of the elements determined exist at a trace or ultra trace level in ashes and most are potential risks in the environment or human body even at low concentrations. Most of the selected elements can be determined directly by ICP-OES, but for the determination of…