On the structure and nucleation mechanism in nucleated isotactic polypropylene crystallized under high pressure

International audienc

Corrigendum to “On the structure and nucleation mechanism in nucleated isotactic polypropylene crystallized under high pressure” [Polymer 151 (2018) 179-186]

International audienc

Quantitative Characterization of Porosity and Determination of Elastic Modulus for Sintered Micro-silver Joints

AbstractHigh resolution serial block-face scanning electron microscopy has been performed on sintered micro-silver pastes that are used as lead replacement joints for die bonding. The size and spatial distributions of the porosity before and after ageing were determined by quantification of the segmented 3D images. The elastic modulus was determined by an image-based finite element model and validated by results obtained from a dynamical resonance method. In agreement with contemporary analytical models on the elastic behaviour of porous materials, the elastic modulus was found to be a function of pore fraction only. Ageing the specimens does not alter the density or Young's modulus

Laser propulsion: preliminary definition of a demonstrator

International audienc

Experimental Investigation of Laser and Materials Parameters for Space Debris Removal by Laser Solutions

Studies on laser Irradiation Parameters Show that, for an appropriate intensity, a short wavelength and short pulse length can lead to a coupling coefficient c_m maximized to produce an optimal mechanical pulse coupling, and to minimize the thermal load: Spacecraft and other objects can be propelled in this way