Thermodynamic and rheological properties of rhyolite and andesite melts

The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relative-enthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not currently accounted for by empirical heat capacity models. The viscosity of both liquids has been measured from the glass transition to 1800 K. The temperature dependence of the viscosity is quantitatively related to the configurational heat capacity (determined calorimetrically) through the configurational entropy theory of relaxation processes. For both rhyolite and andesite melts, the heat capacity and viscosity do not differ markedly from those obtained by additive modeling from components with mineral compositions

Thermodynamic and rheological properties of rhyolite and andesite melts

The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relative-enthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not currently accounted for by empirical heat capacity models. The viscosity of both liquids has been measured from the glass transition to 1800 K. The temperature dependence of the viscosity is quantitatively related to the configurational heat capacity (determined calorimetrically) through the configurational entropy theory of relaxation processes. For both rhyolite and andesite melts, the heat capacity and viscosity do not differ markedly from those obtained by additive modeling from components with mineral compositions

Open Access Publishing at the European Geosciences Union

Poster présenté lors des Fredoc 2011 : "L'information scientifique et technique au prisme de l'Europe" ( Bordeaux 10-13/10/2011)This poster introduces the 14 Open Access Publications of the European Geosciences Union (EGU)published with it's partner Copernicus Publishing. It briefly describes the EGU (II), it's innovative publishing approach (III), the 14 journals of the union (IV), along with dissemination and archives of the journals (V) and ends with a summary (VI). Box I provides an overview.Ce document présente les 14 publications en Open Access de l'European Geosciences Union publiés en partenariat avec Copernicus Publishing. Une brève description de l'EGU est faite , ainsi que le modèle innovant de publication , les 14 titres et le dépôt systématique des articles sur l'archive ouverte Hal ainsi que le soutien de l'INSU ( Institut National des Sciences de l'Univers ) à ce modéle éditorial

Image Based Visual Servoing through Nonlinear Model Predictive Control

International audienceImage based visual servoing (IBVS) is a vision sensor based control architecture. In classical approach, an image Jacobian matrix maps image space errors into errors in Cartesian space. Then a simple proportional control law can be applied guaranteeing local convergence to a desired set point. One of the main advantage of IBVS is its robustness w.r.t camera and robot calibration errors and image measurement errors. Nevertheless, this scheme can not deal with nonlinear constraint such as joint limits and actuator saturation. Visibility constraint is not ensured with classical IBVS. A new IBVS scheme based on Nonlinear Model Predictive Control (NMPC) is proposed considering the direct dynamic model of the robot, its joint and torque limits, the camera projection model and the visibility constraint. Simulations exhibit the efciency and the robustness of the proposed solution to control a 6 degrees of freedom mechanical system

Isothermal P, x, y Data for the Nitrogen + Carbon Monoxide System at five Temperatures from 100 to 130 K and Pressures up to 3.4 MPa

International audienceIsothermal vapor-liquid equilibrium (VLE) data have been measured for the nitrogen + carbon monoxide binary system at 5 temperatures from 100.01 to 130.07 K, and at pressures from 0.37 to 3.35 MPa. This system had already been studied by different authors. Nevertheless, the existing literature data generally indicate high vapor pressure for pure CO and for the highest CO composition in the N 2-CO binary VLE measurements. Our new VLE data have been measured using the "static-analytic" method, taking advantage of two pneumatic capillary samplers (Rolsi®, Armines' patent) coupled to an adapted apparatus able to work at cryogenic temperatures. The new data were compared with the predictions of the GERG equation of state and their consistency was checked by a Van Ness type test. We have observed that the isothermal P, x, y data were well represented with the Peng-Robinson equation of state, especially in the CO rich region

Tools for the Evaluation of Technological Programmes : an Account of Work Done at the Centre for the Sociology of Innovation

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Development and validation of realistic aortic phantoms tailored for each patient

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Multifunctional polymeric implant coatings based on gelatin, hyaluronic acid derivative and chain length-controlled poly(arginine)

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