Growth of Synechococcus sp. immobilized in chitosan with different times of contact with NaOH

The thickness of the walls of the capsules of chitosan-immobilized Synechococcus cultures was dependent on the time of contact with NaOH and was directly related to culture growth. After an initial lag phase, probably caused by cell damage, the capsules obtained after 80 s in a 0.1 N NaOH solution showed better growth than that of free cell cultures (6.9 and 5.2 divisions in 10 days, respectively)

Interpretative and predictive modelling of Joint European Torus collisionality scans

Transport modelling of Joint European Torus (JET) dimensionless collisionality scaling experiments in various operational scenarios is presented. Interpretative simulations at a fixed radial position are combined with predictive JETTO simulations of temperatures and densities, using the TGLF transport model. The model includes electromagnetic effects and collisions as well as □(→┬E ) X □(→┬B ) shear in Miller geometry. Focus is on particle transport and the role of the neutral beam injection (NBI) particle source for the density peaking. The experimental 3-point collisionality scans include L-mode, and H-mode (D and H and higher beta D plasma) plasmas in a total of 12 discharges. Experimental results presented in (Tala et al 2017 44th EPS Conf.) indicate that for the H-mode scans, the NBI particle source plays an important role for the density peaking, whereas for the L-mode scan, the influence of the particle source is small. In general, both the interpretative and predictive transport simulations support the experimental conclusions on the role of the NBI particle source for the 12 JET discharges

La grande vetrata di SS Giovanni e Paolo (Venezia): riflessioni sui restauri pregressi e proposte metodologiche d'intervento

libro da Congresso Scienza e Beni Culturali 24-27 giugno 2008 Bressanon

New protective coatings for ancient glass: silica thin-films from perhydropolysilazane

The aim of the work is to synthesise a new silica coating to protect ancient glass from weathering. The coating is prepared starting from an unusual precursor (Perhydropolysilazane e 20%, NL120A-20, Clariant) that allows to achieve high-quality thin-films of silica at room temperature. The obtained films are uncoloured, even in absence of strong heat-treatment. Perhydropolysilazane (PHPS) is a polymer of [eSiH2eNHeSiH2e]n units. When deposited on a typical microscope slide, it reacts with atmospheric moisture, the SieH and SieNH bonds are hydrolysed to SieO bonds and the typical structure of silica is produced. The conversion to silica is completed in about 66 h when operating at room temperature, using vapours of a 15 mol L1 ammonia solution. A quicker method is the application of a weak heat-treatment (45 C), achievable using as heater a common tungsten filament lamp. With this approach, the conversion to silica films is completed in 2 h. The coated glass samples have been studied by XPS and OM technique

Wildfire behaviour modelling for wildfire hazard characterization: an Earth Observation application

The study is intended as a contribution to the developement of a wildfire behaviour modelling methodology effective in wildfire hazard characterization on a local scale and providing an appropriate scientific information available in decision making processes for wildfire management. Satellite sensor technologies has been investigated in order to acquire updated and reliable input data with a suitable spatial and temporal resolution. The modelling methodology has been validated and calibrated to past events recorded in wildland fire databases of Umbria and Sardinia Regions. Afterwards, an heuristic local research method has been implemented to optimize the accuracy of the models and to estimate their predictive capacity

Dependence of calibration sensitivity of a polysulfone/Ru(II)-Tris(4,7-diphenyl-1,10-phenanthroline)-based oxygen optical sensor on its structural parameters

The optimum performance of an optical oxygen sensor based on polysulfone (PSF)/[Ru(II)- Tris(4,7-diphenyl-1,10-phenanthroline)] octylsulfonate (Ru(dpp)OS) was checked by carefully tuning the parameters affecting the membrane preparation. In particular, membranes having thickness ranging between 0.2 and 8.0 \ub5m with various luminophore concentrations were prepared by dip-coating and tested. The membrane thickness was controlled by tuning the solution viscosity, and was measured both by secondary ion mass spectrometry (SIMS) and by visible spectroscopy (Vis). Luminescence-quenching-based calibration was a single value of the Stern\u2013Volmer constant (KSV) for membranes containing up to 20 mmol Ru(dpp) g 121 PSF (1.35 \ub5m average thickness). The KSV value decreased for larger concentration. The highest sensitivity was obtained with membrane thickness around 1.6 \ub5m, having a response time close to 1 s. Thicker membranes exhibited an emission saturation effect and were characterized by longer response time. The KSV behavior was interpreted on the basis of a mathematical approach accounting for the contribution of luminescence lifetime, oxygen diffusion coefficient (DO2 ) and oxygen solubility inside the membrane (sO2 ) establishing the role of all of them and allowing their experimental determination. Moreover, a simple experimental way to estimate KSV without needing calibration was proposed. It was based either on the light emission asymmetry or on the percent variation of light emission on passing from pure nitrogen to pure oxygen

La grande vetrata di SS. Giovanni e Paolo: rilievo e studio del degrado vitreo e del dissesto statico

\u201cGrandioso finestrone archiacuto a comparti, con magnifica vetrata quattrocentesca, dai meravigliosi smalti colorati. Sebbene molto restaurata, \ue8 una delle opere pi\uf9 insigni uscite dalle fornaci muranesi\u201d (Grand compartmented ogival window, with magnificent fifteenth-century stained-glass, decorated with amazing coloured enamels. Even though much restored, it is one of the most eminent artworks produced in Murano furnaces). Such description given by Lorenzetti [1], sets the features of the Grande Vetrata of the SS. Giovanni e Paolo Church in Venice and above all, it considers every single part of which this marvellous work of art is constituted. These different parts are: the stone frame in which the stained-glass window is allocated, the stained-glass window itself (made up of 66 panels), and the grisaille used to decorate the glass tesserae. Looking at the precedent restoration works [2], it has been seen that the problem of the stone wall consolidation arose also in the past. Such a problem, however, was always considered second place as to the grisaille consolidation and to the image conservation. A close up analysis of the artefact was made and all the weathering phenomena were documented. The documentation was carried out for every constituent of the work of art (glass tesserae, metallic retaining structures and stone wall) and particular attention was given to their interactions (i.e. the consequences of the wall movement on the stained-glass window). The diagnostic work was conducted at different stages: characterization of the Building, Technological and Decorative Apparatus; analysis of their weathering and comparison of the data related to each apparatus. The restoration project will have to aim to the consolidation and integration of the grisailles, where it will be necessary, but the consolidation of the stone wall and the rectification of the panels\u2019 deformation will not have to be relegated to the second place