158 research outputs found
Exploiting web resources for the identification of relations between concepts: a Java based implementation and case study
Get PDFA Java based implementation of an Ontology Evolution Manager was described in Gabbanini (2010): it is a framework offering a set of tools to support processes of manipulation and growth of ontological knowledge bases, based on inputs consisting in free text documents. The Ontology Evolution Manager can be used to support the process of Ontology Evolution, i.e., the process of identifying potential novel entities and relationships to be included in an established ontology. This report describes a Java based application, built using the Ontology Evolution Manager, intended to perform ontology evolution processes, by enriching ontologies with new relations. The enrichment phase uses as sources of background knowledge the WordNet repository (see WordNet, 2010) and the Scarlet system (Sabou et al., 2008, Sabou et al., 2008b, Scarlet, 2010). The application is based on ideas described in Zablith et al. (2009), but new ideas have been introduced and the code has been implemented from scratch by the author, so as to be reusable within the framework of the Collective Knowledge Management System described by Burzagli et al. (2010). The report describes techniques and implementation details, along with a test case in which an ontology, built within the e-Inclusion Laboratory1 to describe the domain of inclusive tourism, is enriched with entities and relationships generated from the analysis of textual reviews, contributed by customers of a real web based service that allows booking and commenting on the accessibility of a selection of accommodation resources all over the world
Ion processes in the photoionization of laser cooled alkali atoms
No full textThe results of recent photoionization experiments performed on laser cooled cesium and rubidium atoms are critically examined. The role of processes, as ion diffusion and recombination, determining the time evolution and the rate of the produced atomic ions is discussed. A more precise model of the ion evolution is presented, numerically solved and compared to the experimental data. (C) 2000 Elsevier Science B.V. All rights reserved. RI Ciampini, Donatella/E-2097-201
Energy-Pooling Processes in Laser-Excited Alkali Vapors : An Update on Experiments
No full textLes processus d'"energy pooling" dans les vapeurs atomiques alcalines excitées par laser sont passés en revue. On présente en particulier les résultats les plus récents obtenus pour le sodium.We present a short review of energy pooling experiments in laser excited alkali vapors, for low atom density and low radiation intensity. Special emphasis is devoted to the most recent results obtained in sodium vapor
Analysis of in vitro release through reconstructed human epidermis and synthetic membranes of multi-vitamins from cosmetic formulations
No full textLaser cooling and photoionization of alkali atoms
No full textWe carry out photoionization experiments on laser-cooled alkali atoms by irradiating rubidium and cesium magneto-optical traps (MOTs) with a photoionizing laser beam. Analysis of the loading behavior of the traps allows us to determine photoionization cross-sections for the first excited state of rubidium and cesium based on a trap load/loss model. In addition, our experimental findings reveal systematic peculiarities, which can be ascribed to the low temperature of the atomic samples under investigation
Lemon (Citrus limon, Burm.f.) essential oil enhances the trans-epidermal release of lipid- (A, E) and water- (B6, C) soluble vitamins from topical emulsions in reconstructed human epidermis
No full textTopical bioavailability of lipid- and water-soluble vitamins is a critical
issue for protecting or anti-ageing formulations. Using 17-dayold
SkinEthic reconstructed human epidermis, we investigated (at
34C) the role of lemon EO in enhancing the penetration of
a-tocopherol (E) and retinyl acetate (A), pyridoxine (B6) and ascorbic
acid (C), released from O/W or W/O emulsions. D-limonene,
a-pinene and p-cymene (65.9, 2.2 and 0.5%w/w of the oil)
had skin permeability coefficients Ps (10)3 cm h)1) of 0.56 ± 0.03
(or 0.73 ± 0.02), 0.72 ± 0.05 (or 0.98 ± 0.05) and 0.84 ± 0.04
(or 1.14 ± 0.04), respectively, when incorporated in a W/O
(or O/W) emulsion. Vitamins B6, C and A had Ps values
of (3.0 ± 0.4) · 10)3, (7.9 ± 0.6) · 10)3 and (0.37 ± 0.02) ·
10)5 cm h)1, respectively, and their flux through the skin was
enhanced by a factor of 4.1, 3.4 and 5.8, respectively, in the presence
of lemon EO. The penetration of vitamin E was nine-fold
enhanced. Lemon EO produced only reversible modification of
TEWL, and it is a safe and effective penetration enhancer for topical
administration of lipid- and water-soluble vitamins
HS-SPME-GC-MS analysis of body odor to test the efficacy of foot deodorant formulations.
No full textCross Section Measurement and Theoretical Evaluation for the Energy Transfer Collision Na(3P)+Na(3P) ? Na(4F)+Na(3S)
No full text
Line shape study of two-color three-photon ionization of Rb atoms
No full textWe report on the analysis of the line shapes in a two-color, three-photon ionization process of rubidium atoms in a magneto-optical trap. A cw and a pulsed laser are tuned almost at resonance with the 5(2)S(1/2)-5(2)P(3/2) and the 5(2)P(3/2)-6(2)D(5/2) transitions, respectively. The line shapes, recorded as functions of the pulsed laser wavelength, are strongly asymmetric with respect to the near resonance peak positions: in fact, they present long tails only on one side, according to the sign of the detuning of the cw laser. Moreover, the signal is overall stronger for negative than for positive detunings. Theoretical considerations based on the Autler-Townes scheme and computer simulations of the excitation-ionization dynamics show that the main source of asymmetry is the coupling of the two ionization pathways going through the 6(2)D(3/2) and 6(2)D(5/2) levels. In order to reproduce the experimental line shapes one must take into account the variability of the pulsed laser intensity and its finite coherence time
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