Integration of a microprobe into a CMM

Various microprobes have been developed in the last decade to address the needs of micrometrology. However, most microprobes are only employed in specialized measuring machines located in a few research institutes and are not widespread in the industry. This work aims to extend the capabilities of conventional coordinate measuring machines (CMMs) towards measuring microgeometries through the low-cost integration of a tactile microprobe. In order to demonstrate this, a gear measuring instrument (GMI), which is a commercial CMM not specialized for measurements at the microscale, has been equipped with a recently developed silicon-membrane-based microprobe. In the first part of this work, the working principle of the microprobe, its assembly and its integration into the GMI are described. Two different mounting setups of the microprobe onto the GMI were evaluated and tested. Measurements on the GMI were performed solely with the microprobe or by combining the microprobe and the measurement system already present on the GMI. This combination makes it possible to use the microprobe advantageously and to exchange it in a comfortable semi-automatic way. To test these two mounting setups, a new involute scanning artifact (SAFT) with superimposed waviness was measured

MgAl Hydrotalcite-derived Mixed Oxides for CO2 Adsorption

SSCI-VIDE+ATARI+VFO:AAUInternational audienceLayered Double Hydroxides (LDHs) and LDH-derived materials are potentially good adsorbents for CO2. Moreover, they are relatively cheap, they are easy to synthesize, they present high sorption capacity, and surface basicity. They have been intensively studied in CO2 capture at high temperature, presenting variable sorption capacities for MgAl LDHs with the same composition, but prepared under different synthesis conditions. The sol-gel synthesis method is an attractive one-step procedure to synthesize LDHs under mild conditions, with low energy consumption and short synthesis time. The present study is based on the synthesis of hydrotalcites (HTs) by sol-gel process for CO2 adsorption. The structural and physico-chemical properties of the as-synthesized and calcined HTs have been deeply characterized. Moreover, the effect of the surface basicity and the CO2 sorption capacity have been investigated.Adsorption calorimetry was applied for determining the concentration (from the adsorption volumetric isotherms), strength and strength distribution (using the differential heat of adsorption as a function of coverage) of the basic sites involved in CO2 adsorption. The hydrotalcite-derived mixed oxides surface basicity was probed by adsorption calorimetry of SO2.Two population of basic sites were identified, at low energy (heat of adsorption below 60 kJ/mol) and high energy (heat of adsorption higher than 150 kJ/mol). The sol-gel method led to the formation of hydrotalcites with similar (sometimes higher) performances than conventional LDHs prepared by time and energy consuming methods (like coprecipitation). The calcined hydrotalcites exhibit CO2 adsorption capacities of around 0.5 mmol/g, a value similar to those reported in the literature for sample generally synthesized by coprecipitation (see figure).A linear correlation between the surface basicity (concentration of low and high energy sites) and the adsorption capacity was found. The possibility to tune the Mg/Al molar ratio is a promising feature to obtain a wide range of LDHs (with various surface basicity) with a higher efficiency in CO2 adsorption.Acknowledgments: This work was supported by Université de Haute Alsace and École Doctorale Physique et Chimie- Physique (ED 182). XRD, NMR, XRF, BET, TGA, were performed on the technical platforms of IS2M

MgAl Hydrotalcite-derived Mixed Oxides for CO2 Adsorption

SSCI-VIDE+ATARI+VFO:AAUInternational audienceLayered Double Hydroxides (LDHs) and LDH-derived materials are potentially good adsorbents for CO2. Moreover, they are relatively cheap, they are easy to synthesize, they present high sorption capacity, and surface basicity. They have been intensively studied in CO2 capture at high temperature, presenting variable sorption capacities for MgAl LDHs with the same composition, but prepared under different synthesis conditions. The sol-gel synthesis method is an attractive one-step procedure to synthesize LDHs under mild conditions, with low energy consumption and short synthesis time. The present study is based on the synthesis of hydrotalcites (HTs) by sol-gel process for CO2 adsorption. The structural and physico-chemical properties of the as-synthesized and calcined HTs have been deeply characterized. Moreover, the effect of the surface basicity and the CO2 sorption capacity have been investigated.Adsorption calorimetry was applied for determining the concentration (from the adsorption volumetric isotherms), strength and strength distribution (using the differential heat of adsorption as a function of coverage) of the basic sites involved in CO2 adsorption. The hydrotalcite-derived mixed oxides surface basicity was probed by adsorption calorimetry of SO2.Two population of basic sites were identified, at low energy (heat of adsorption below 60 kJ/mol) and high energy (heat of adsorption higher than 150 kJ/mol). The sol-gel method led to the formation of hydrotalcites with similar (sometimes higher) performances than conventional LDHs prepared by time and energy consuming methods (like coprecipitation). The calcined hydrotalcites exhibit CO2 adsorption capacities of around 0.5 mmol/g, a value similar to those reported in the literature for sample generally synthesized by coprecipitation (see figure).A linear correlation between the surface basicity (concentration of low and high energy sites) and the adsorption capacity was found. The possibility to tune the Mg/Al molar ratio is a promising feature to obtain a wide range of LDHs (with various surface basicity) with a higher efficiency in CO2 adsorption.Acknowledgments: This work was supported by Université de Haute Alsace and École Doctorale Physique et Chimie- Physique (ED 182). XRD, NMR, XRF, BET, TGA, were performed on the technical platforms of IS2M

ING3 is required for ATM signaling and DNA repair in response to DNA double strand breaks

International audienc

FIVHeMA: Intraventricular fibrinolysis versus external ventricular drainage alone in aneurysmal subarachnoid hemorrhage: A randomized controlled trial

International audienc