Sur une propriété de transfert concernant les boules de Rn

Sans résumé     

Sur les configuration de Hadwiger

Sans résumé     

Waveguide and diode heterodyne measurements with CO2 laser and assignment of the CW FIR laser emission of OCS

Heterodyne spectra of carbonyl sulfide have been obtained with saturation in a CO₂ waveguide laser and without saturation with a diode laser. The absolute uncertainties of the measured positions lie between 10⁻⁴ and 7 × 10⁻⁶ cm⁻¹. The CW submillimeter laser line of OCS at 378 μm has been assigned to the J = 65 → 64 transition in the 02²0e state of ¹⁶O¹²C³²S, with a pumping through the R(64) line of 02²0e ← 00⁰0, a Δ-Σ transition weakly allowed by the l-type resonance.     

Absolute diode-laser frequency calibration using varactor mixing with a stabilized CO2 laser. Ozone spectrum near the 9R6 CO2 frequency

Efficient infrared varactor mixing near 9 μm has been performed between diode-laser and CO₂ laser. Difference frequency up to 17 GHz has been detected using non linear mixing between the two radiations and the first four harmonics of a microwave frequency (f = 4.2 GHz). As a result, the absorption spectrum of ozone near the 9R₆ CO₂ line is frequency scaled over a 1.7 cm^-1 range with microwave accuracy.     

A two-sided Arnoldi algorithm with stopping criterion and MIMO selection procedure

In this paper we introduce a two-sided Arnoldi method for the reduction of high order linear systems and we propose useful extensions, first of all a stopping criterion to find a suitable order for the reduced model and secondly, a selection procedure to significantly improve the performance in the multi-input multi-output (MIMO) case. One application is in micro-electro-mechanical systems (MEMS). We consider a thermo-electric micro thruster model, and a comparison between the commonly used Arnoldi algorithm and the two-sided Arnoldi is performed.     

In-depth investigation of protein adsorption on gold surfaces: correlating the structure and density to the efficiency of the sensing layer

Protein A (PrA), mouse monoclonal anti-IgG antibody (SAb) and deglycosylated avidin (NAV) were adsorbed on gold surfaces to capture the model rabbit IgG and build three immunosensing platforms. The assembling of immunosensors, their specificity, and the receptor accessibility were monitored by polarization modulation reflection-absorption infrared spectroscopy (PM-RAIRS) and quartz crystal microbalance with dissipation measurement (QCM-D) at each step. Combining these two techniques allows us to compare both chemical and structural properties of the sensing layers with the former bringing chemical and semiquantitative information on the grafted protein layers, whereas the latter, in addition to the mass uptake, enables us to take the layer rigidity into account. Grafting of the three capture proteins to the transducer surfaces, covered with appropriate self-assembled monolayers, yielded protein layers with variable properties. NAV formed a dense and rigid molecular layer, likely containing protein aggregates, whereas the amount of PrA was below one monolayer resulting in a flexible layer. The amount of immobilized rabbit IgG was different for the three systems with the densest capture protein layer exhibiting the lowest binding capacity. The accessibility of antibodies on the resulting immunosensors measured by interaction with a secondary antirabbit IgG antibody was found to be closely dependent on their coverage as well as on the rigidity of the protein layer. The overall study provides in-depth information on three of the most common immunosensor recognition interfaces and demonstrates the crucial influence of both structure and density of the protein layer on the efficiency of the molecular recognition phenomena.