196,783 research outputs found
Aprendizaje colectivo y fortalecimiento de capacidades endógenas para la construcción de espacios comunitarios de diálogo. Albardón, San Juan, Argentina
No full textFil: Spinetti Cauduro, Mariela, . Universidad Nacional de Villa María; Argentina.Fil: Santandreu, María M., . Universidad Nacional de Villa María; Argentina.Fil: Marsiglia, Javier, . Universidad Nacional de Villa María; Argentina
Offline Cursive Character Challenge: a New Benchmark for Machine Learning and Pattern Recognition Algorithms
No full textCursive character recognition is a challenging task due to high variability and intrinsic ambiguity of cursive letters. This paper presents C-Cube (Cursive Character Challenge), a new public-domain cursive character database. C-Cube contains 57293 cursive characters manually extracted from cursive handwritten words, including both upper and lower case versions of each letter. The database can be downoloaded from the Web and it provides predefined experimental protocols in order to compare rigorously the results obtained by different researchers
Substitution reactions at palladium(II) complexes producing dimeric species: stability constants determination for simultaneous equilibriums
No full textLe indagini biologiche per l' accertamento di paternità - L' esperienza del Laboratorio di Emogenetica Forense di Pisa nel periodo 1978/90.
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Kinetic and Thermodynamic Studies on Ga3+/PAR Complex Formation in SDS Surfactant Solutions
No full textIn recent years, owing to the awareness on environmental hazards in the wide use of organic solvents for metal ion extraction, selective extraction and concentration of toxic and precious metals from aqueous streams and liquid wastes by new smart technologies has been the object of intense studies. Between these new strategies, micellar media were found to have significant advantages over a two-phase water-organic solvent system for the extraction process.1,2 In addition of lower environmental impact, the micelles are distributed uniformly through the medium as very small (nano-sized) aggregates, therefore avoiding mixing problems due to unhomogeneity. In the presence of a negatively charged surface, such as is provided by the head groups of the surfactant, the metal ion will be electrostatically attracted to the micelle surface and the extractant will concentrate in the hydrophobic core of the micelle. Under these conditions the extent of extraction will be enhanced as the result of a local concentration effect on both reactants.A study on the kinetics and thermodynamics of the reaction between Ga(III) and ligand 4-(2-pyridylazo)resorcinol (PAR) has been done in sodium dodecyl sulphate (SDS) surfactant solutions, by means of the stopped-flow technique and by UV-vis spectroscopy. A rate promotion effect is found for the forward reaction and for the equilibrium constant in the presence of micelles. The maximum catalysis effect is found when the surfactant concentration is just above the cmc (critical micellar concentration), followed by a decrease at higher SDS concentrations. The kinetic constant of complex formation in SDS solutions at pH=4 is much lower that the one measured at pH=6. In fact, under the latter pH conditions, the neutral PAR species prevails. Such a neutral molecule will have lower tendency to condensate on the negative micelle surface than the protonated H3PAR+ species. Further mechanistic details will be discussed
La identificazione dei marcatori genetici su tracce biologiche: stato attuale del Laboratorio di emogenetica forense di Pisa.
No full textVolcanic aerosol optical characteristics of Mt. Etna tropospheric
No full textTropospheric volcanic plume features have been derived from airborne multispectral images collected during field
measurement campaigns at the Mt. Etna volcano in June 1997, during a quiescent period, and in July 2001 during an
eruptive period. Results have been obtained in terms of mapping the volcanic aerosol optical thickness (AOT), the
A ˚
ngstro¨ m parameters and the water vapor content using different bands from visible to infrared. The AOT values show
average values of 0.1 and 1, for quiescent and eruptive plumes, respectively, demonstrating that this geophysical parameter
well indicates a major contribution of particulates in the explosive plume with respect to the quiescent one. The mapping of
A ˚
ngstro¨ m parameters, in the explosive case, indicates the presence of larger particles and their distribution along the
plume, while in the quiescent case indicates the particle size is dominated by small particles with an effective radius about
1 mm. Further in the quiescent case, the map of water vapor shows low values indicating that water vapor emitted
condenses mainly in aerosols.Published981-9941.10. TTC - TelerilevamentoJCR Journalreserve
Range sensors on marble surfaces: quantitative evaluation of artifacts
No full textWhile 3D imaging systems are widely available and used, clear statements about the possible influence of material properties over the acquired geometrical data are still rather few. In particular a material very often used in Cultural Heritage is marble, known to give geometrical errors with range sensor technologies and whose entity reported in the literature seems to vary considerably in the different works. In this article a deep investigation with different types of active range sensors used on four types of marble surfaces, has been performed. Two triangulation-based active sensors employing laser stripe and white light pattern projection respectively, and one PW-TOF laser scanner have been used in the experimentation. The analysis gave rather different results for the two categories of instruments. A negligible light penetration came out from the triangulation-based equipment (below 50 microns with the laser stripe and even less with the pattern projection device), while with the TOF system this came out to be two orders of magnitude larger,quantitatively evidencing a source of systematic errors that any surveyor engaged in 3D scanning of Cultural Heritage sites and objects should take into account and correct
Determination of Trypsin, Chimotrypsin and Kallikrein in Porcine Pancreas Extract by Capillary Zone Electrophoresis
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