Silylation and sulfonation of structured supported catalysts active in the decoloration of azo-dyes under visible light

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Introduction to numerical methods to simulate systems of stochastic differential equations (SDEs) both in Ito and Stratonovich scheme.

The parameterization of the atmospheric boundary layer is essential for accurate numerical weather predictions. The near-surface values of air temperature or wind speed for instance are highly dependent on the complex land – atmosphere interactions over heterogeneous terrain. Over such surfaces, several open challenges remain regarding the growth of internal boundary layers, the determination of mixing layer heights and the spatial distribution of heat and momentum fluxes. The large-eddy simulation (LES) co

Nanostructures are known to exhibit novel optical, electrical, and magnetic and many other interesting physical properties and a lot of research has been invested on the synthesis and study of such structures in the recent years. The massive drive towards miniaturization of devices heavily relies on the successful functioning of nanostructures. Self-assembly (or the bottom-up approaches) is emerging as an attractive tool for creating functional nanostructures owing to its simplicity and relatively low cost

Electrochemical techniques were applied to a coulometric titration cell to study oxygen nonstoichiometry and transport in the perovskite-type oxide La0.4Ba0.6Fe0.8Co0.2O3-delta. Slow scan voltammetry (3mV/s) was used to obtain oxygen nonstoichiometry vs. the oxygen partial pressure (p(O2)) data. The voltammograms were further analysed using a simple defect model to yield the absolute value of the oxygen nonstoichiometry. Relaxation measurements were performed to obtain chemical diffusion and surface exchang

We investigate low-frequency electromagnetic wave propagation and absorption properties in 2D and 3D plasma configurations. For these purposes, we have developed a new full-wave 3D code LEMan that determines a global solution of the wave equation in bounded stellarator plasmas excited with an external antenna. No assumption on the wavelength compared to the plasma size is made, all the effects of the 3D geometry and finite plasma extent are included. The equation is formulated in terms of electromagnetic po

Placing concrete requires much more water than the cement needs for its hydration. This results in an important porosity in the hardened concrete, which accentuates the degradation of this material. By adding small amounts of polymeric admixtures, called superplasticizers, to the fresh concrete one can significantly reduce the amount of water required to obtain the suitable workability. The plasticizing effect of superplasticizers has been studied for many years, and remains today, an ongoing field of resea

The potential of pulp fiber reinforced thermoplastics is currently not fully explored in composites. One of the main reasons is that pulp fibers are extracted for the use in papermaking and are thus not optimized for use as reinforcements in thermoplastics. Furthermore, currently used processing methods constitute several severe thermomechanical steps inducing premature degradation of the fibers. A systematic development of these composite materials requires the study of both these aspects. The goal of this

A few years ago the concept of homogeneous arene hydrogenation catalysis was called into question, since many catalysts originally assigned as homogeneous have subsequently been shown to be precursors to heterogeneous ( colloidal or nanoparticulate) catalysts. In this Perspective, the mechanism for arene hydrogenation is described and extended to include polynuclear ( cluster, colloidal and nanoparticulate) catalysts. The various experiments used to determine whether catalysis is by homogeneous or heterogen

With the very high electron cyclotron (EC) wave power density achieved in the TCV tokamak, more than 20 MW m(-3), quasilinear modelling predicts an electron cyclotron current drive (ECCD) efficiency well in excess to the experimental value, by up to a factor of 10. Experimentally, radial transport of suprathermal electrons consistent with a diffusion coefficient larger than 1.5 m(2) s(-1) has been observed. This implies that the radial transport time is of the same order as the electron deflection time, sug

This thesis covers the analysis of the catalytic growth of carbon nanotubes under well de fined conditions, the optimization of the field emission properties of those structures and introduces a model for the growth mechanism based on the experimental results. Experimental investigations are presented which allow to get a comprehensive picture of the catalytic growth of carbon nanotube films. These films were generated by patterning silicon surfaces with transition metal catalysts usingmicro contact printin

In this work, we address the numerical solution of fluid-structure interaction problems. This issue is particularly difficulty to tackle when the fluid and the solid densities are of the same order, for instance as it happens in hemodynamic applications, since fully implicit coupling schemes are required to ensure stability of the resulting method. Thus, at each time step, we have to solve a highly nonlinear coupled system, since the fluid domain depends on the unknown displacement of the structure. Standar

The application of Computational Fluid Dynamics simulations based on the Reynolds Averaged Navier- Stokes (RANS) equations to the design of sailing yachts is becoming more commonplace, particularly for the America's Cup. Drawing on the experience of the Ecole Polytechnique FÃ©dÃ©rale de Lausanne as Official Scientific Advisor to the Alinghi Challenge for the Americaâ s Cup 2003, the role of RANS-based codes in the yacht design process is discussed. The strategy for simulating the hydrodynamic flow around t

Silylation and sulfonation of structured supported catalysts active in the decoloration of azo-dyes under visible light

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Numerical Integration of SDEs: A Short Tutorial

Large-Eddy Simulation of the Convective Atmospheric Boundary Layer over Heterogeneous Land Surfaces

Tunable surface nanostructures from Block copolymer self-assembly

Electrochemical characterisation of oxygen nonstoichiometry and transport in mixed conducting oxides : Application to La0.4Ba0.6Fe0.8Co0.2O3

Low frequency electromagnetic wave propagation in 3D plasma configurations

Adsorption de polycarboxylates et de lignosulfonates sur poudre modèle et ciments

Alkali-Methanol-Anthraquinone pulping of Miscanthus x giganteus for thermoplastic composite reinforcement

Arene hydrogenation by homogeneous catalysts: fact or fiction?

Modelling of the electron cyclotron current drive experiments in the TCV tokamak

Analysis of the catalytic growth of carbon nanotubes

Acceleration of a fixed point algorithm for fluid-structure interaction using transpiration conditions

Numerical simulation using RANS-based tools for America's Cup design