Search results for "TRID"

Investigation of the SHS mechanisms of titanium nitride by in situ time-resolved diffraction and infrared thermography

2007

Abstract The self-propagating high-temperature synthesis (SHS) or combustion synthesis is a promising process to produce advanced ceramics due to the high purity of the elaborated materials and the very short synthesis time. Titanium nitride has been synthesised from pressed titanium powder and a nitrogen gas flow under a 0.1 MPa pressure. The influence of the addition of a TiN diluent was investigated. For the first time, SHS reaction mechanisms were determined from in situ time-resolved X-ray diffraction (TRXRD) experiments using the synchrotron radiation. These experiments were coupled with infrared thermography to study the propagation of the combustion reaction. It appeared that the in…

Si and Si-rich silicon-nitride waveguides for optical transmissions and nonlinear applications around 2 µm

2019

We show that cm-long silicon and silicon-rich silicon nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal with negligible power penalty. Parametric conversion in both continuous and pulsed pump regimes is also demonstrated, as well as the spectral broadening of picosecond pulses.

Theoretical use of boron nitride nanotubes as a perfect container for anticancer molecules

2016

International audience; In recent years great interest has emerged in the development of nanocarriers for drug transport. One of themajor challenges is to obtain a drug delivery system able to control the drug release profile, transportabsorption and distribution, in the view of improving efficacy and safety. Herein, we present theoreticalresults based on density functional theory (DFT) to determine the best adsorption site for the anticancerifosfamide molecule in boron nitride nanotubes. For this functionalized system we determine thedependence of the adsorption energy on the displacement of molecules in the outer and inner boronnitride surfaces, together with their local morphological and…

3D acquisition system for transparent objects

2010

This thesis deals with a new automated tridimensional inspection system for transparent surfaces, based on polarization analysis. We first present an extension of the ‘Shape from Polarization’ method for transparent surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges on. Hence, by measuring the polarization parameters of the reflected light, the surface normals are computed. The ambiguity concerning the normal orientation is solved here with a multispectral lighting system. Finally, the description of the whole acquisition prototype is given as well as some exper…

Excitons in few-layer hexagonal boron nitride: Davydov splitting and surface localization

2018

Hexagonal boron nitride (hBN) has been attracting great attention because of its strong excitonic effects. Taking into account few-layer systems, we investigate theoretically the effects of the number of layers on quasiparticle energies, absorption spectra, and excitonic states, placing particular focus on the Davydov splitting of the lowest bound excitons. We describe how the inter-layer interaction as well as the variation in electronic screening as a function of layer number $N$ affects the electronic and optical properties. Using both \textit{ab initio} simulations and a tight-binding model for an effective Hamiltonian describing the excitons, we characterize in detail the symmetry of t…

Detoxification of Copper and Chromium via Dark Hydrogen Fermentation of Potato Waste by Clostridium butyricum Strain 92

2022

The accumulation of various types of waste containing both organic and inorganic metal-containing compounds is extremely hazardous for living organisms. The possibility of polymer degradation, biohydrogen synthesis, and metal detoxification via the dark fermentation of model potato waste was investigated. For this purpose, the strict anaerobic strain was isolated and identified as Clostridium butyricum. The high efficiency of dark hydrogen fermentation of potatoes with yield of hydrogen in 85.8 ± 15.3 L kg−1 VSpotato was observed. The copperand chromium salts solutions were added to the culture fluid to obtain the concentrations of 50, 100, and 200 mg L−1 Cu(II) and Cr(VI) in the active pha…

Un groupe statuaire complexe à Autun : essai d’identification

2012

Au cours d’un diagnostic réalisé au nord-ouest de la ville d’Autun, à proximité du rempart d’origine augustéenne, un fragment de groupe statuaire a été trouvé au croisement de deux rues antiques. Reposant sur le sol de circulation, il semble avoir été abandonné au cours de l’Antiquité tardive ou du haut Moyen Age. Il se compose d’un personnage cuirassé (cuirasse musclée) vraisemblablement représenté de dos. Il s’agirait d’une gigantomachie, en ronde-bosse (sculpté sur trois cotés), la face principale a été délitée par la cassure de l’arkose taillée en délit (les bancs géologiques locaux sont impuissants à fournir la hauteur nécessaire à ce groupe). Sur ce drapé, on voit se lover dans une at…

Apatridia. Protección internacional y reconocimiento de su estatuto jurídico en España

2020

La apatridia es una vulneración de derechos humanos que afecta a millones de personas en el mundo y a miles en España. No se trata solo del incumplimiento del derecho humano a una nacionalidad, sino de todos los demás que exigen la posesión de una para ser ejercitados en la práctica de forma efectiva. La nacionalidad moderna, entendida como vínculo jurídico entre la persona y el Estado a través del cual este le reconoce derechos y deberes, es una institución que ejerce de frontera, al actuar como elemento clave para delimitar la soberanía personal de aquel Estado. Así, hereda los componentes de inclusión y, a la vez, exclusión de la ciudadanía clásica, a la cual reemplaza. Hoy se entiende p…

Astrid Lindgrens barnböcker i ljuset av krav på bra barnlitteratur

1997

Estudio del proceso simultáneo de sacarificación y fermentación aceto-butílica-etílica a partir de paja de arroz

2022

El sistema energético de la Unión Europea está experimentando una profunda transformación con la finalidad de mitigar el cambio climático y de asegurar la independencia energética de sus Estados Miembro. Para ello se están llevando a cabo una serie de medidas como la implantación de una cuota mínima en el transporte del 3.5% de biocarburantes producidos a partir de residuos lignocelulósicos, entre otros biocombustibles, para 2030. En este contexto, toma relevancia la producción de biobutanol a partir de residuos lignocelulósicos mediante la fermentación aceto-butílica-etílica (ABE). Sin embargo, su implantación a nivel industrial continúa presentando una serie de desafíos entre los que se p…