Search results for "asma"

Expansion dynamics of the plasma plume formed by the impact of a nanosecond Nd : YAG laser beam on metallic surface under atmospheric conditions : ex…

2010

Laser ablation in the air at atmospheric pressure is nowadays frequently applied in industry, chemical analysis, surgery… For a further development of laser ablation based technologies, it is necessary to better understand the laser – matter interaction. During the impact of a laser pulse on the surface of the treated material, a plasma plume forms above the target surface. This plume contains particles (electrons, ions, atoms) of ablated matter, as well as of ambient gas, if present. During the laser pulse, this plume absorbs a large amount of the laser beam energy, thus reducing the quantity of the laser radiation arriving to the target surface. Dimensions, as well as parameters of this p…

Ceramique/metal component elaborated by flash sintering for ballistic protection

2012

This dissertation describes the synthesis of new components for ballistic protection with the assistance of flash sintering. Indeed, the objective is to associate two compounds showing very different sintering temperatures – such as alumina and aluminum, two reference materials for ballistic protection applications.The first synthesis method tested was the elaboration of a bi-material via the sintering of aluminump owder on alumina bulks. This study permitted to observe the formation of the alumina/aluminum bonding by scanning and transmission electron microscopy and to optimize the assembly parameters in order to obtain a bimaterials howing a strong interfacial cohesion. Adapted characteri…

Elaboration de céramiques transparentes Er YAG : synthèse de poudre par co-précipitation et frittage SPS

2013

Yttrium aluminium garnet (YAG, Y3Al5O12) transparent ceramics have attracted much attention since it can replace single crystals as host materials in solid state heat capacity lasers. These polycrystalline ceramics present improved mechanical and spectroscopic properties, as well as a better heat conductivity, lower fabrication costs for larger size materials. Furthermore, it is possible to reach higher doping concentrations as well a uniform distribution. Doping YAG with Erbium (Er:YAG) allows eye-safe emission at 1645nm. Moreover, a low doping rate (0.5%at.) enables upconversion process during laser operation. Conditions for transparency are amongst others, the absence of defects, a high …

PE-CVD with organometallic precursors: contribution of aerosol assisted processes

2021

International audience; PE-CVD is widely used to deposit inorganic thin films. For example, a lot of different precursors (TEOS, HMDSO, HMDS, TMS, etc.) has been used for organosilicon or silica-like coatings. In contrast, only few studies are using organometallic precursors. Indeed, such molecules are generally unstable, pyrophoric and highly reactive with air and/or oxygen. Aerosol-assisted processes are able to avoid these problems. Indeed, diluted in organic solvents, it enables to inject droplets of organometallic precursor charged liquids. This contribution aims to report first results obtained with nickel-or zinc-based organometallic precursors. Using a pulsed injection of the liquid…

Soft tissue integration of different abutment surfaces: An experimental study with histological analysis

2021

OBJECTIVE To evaluate whether abutment surface and surface bio-activation have an effect on soft tissue morphogenesis. MATERIALS AND METHODS 36 patients (36 implants) were included. Abutments were randomly divided into 4 groups (n = 9): Smooth Surface-MAChined (MAC), Ultrathin Threaded Microsurface (UTM), MAC Plasma of Argon activated (Plasma-MAC), and UTM Plasma of Argon activated (Plasma-UTM). After 2 months of healing, soft tissue samples were collected and prepared for histological analysis. The margin of the peri-implant mucosa (PM), the apical extension of the barrier epithelium (aJE), and the apical location of the abutment (AM) were identified. Significances of differences among gro…

Conservazione in vitro in crescita rallentata di accessioni di susino del germoplasma siciliano.

2012

Elastiset törmäykset suurienergiaisten partonien poikittaisliikemäärän vaimenemismekanismina kvarkkigluoniplasmassa

2007

Tiheä kvarkkiaine ja Nambu-Jona-Lasinio-malli

2007

Epidemiología de la alergia a nivel nacional y por comunidades autónomas. Estudio de prevalencia y factores asociados en un periodo de 25 años.

2023

Actualmente, se percibe que la alergia se comporta como una patología que se extiende cada vez más, afectando a una proporción importante de la población, y que aparece fundamentalmente en países industrializados con modos de vida occidentales, siendo factores impulsores la contaminación y los efectos del cambio climático. Sin embargo, cuando acudimos a la búsqueda de confirmación de estos hechos, nos encontramos que los datos epidemiológicos de alergia y asma en nuestro país son muy escasos. Existen algunos estudios de prevalencia de alergia, pero realizados únicamente en población infantil. También algunos muestreos sobre pacientes que ya acudían al alergólogo con la sospecha de una enfer…

Double-application of platelet-rich plasma on bone healing in rabbits

2010

Objective: Platelet-rich plasma (PRP) is considered to enhance bone formation especially at early stages of wound healing, depending on the limited and short life-span of platelets and growth factors. The aim of this study was to evaluate efficacy of double-application of PRP (DA-PRP) on bone healing in a rabbit calvarial defect model. Study design: Twenty-eight rabbits, each had two surgically prepared calvarial bone defects (10mm diameter), were included in this study and randomly divided into six groups. Defects (n=56) were treated with single-application of PRP (SA-PRP)(n=10), SA-PRP and beta-tricalciumphosphate (SA-PRP+TCP)(n=10), DA-PRP (n=8), DA-PRP and beta-tricalciumphosphate (DA-P…