3,621 research outputs found
Lucas Lenz, o 'private eye' de Pablo de Santis
No full textEn este artículo nos detenemos en una novela particular del escritor argentino Pablo De Santis: Lucas Lenz y el Museo del Universo (1992). Si bien se trata de una novela destinada a un público juvenil, en ella encontramos elementos propios del género negro. La caracterización del protagonista y episodios de violencia nos permiten vincular la novela a temas ligados a un presunto público adulto. De este modo, vemos que la usual clasificación de las novelas de De Santis entre textos de adolescentes y de adultos pierde consistencia. En todo caso, concluimos que una lectura global de la obra del autor debería prescindir de esta división reduccionista.In this article we focus on a particular novel by Argentinian writer Pablo De Santis: Lucas Lenz y el Museo del Universo (1992). While this is a novel aimed at a young audience, in this text we find elements of the hard-boiled genre. The characterization of the protagonist and violent episodes allow us to link the novel with what is supposed to be an adult audience. Thus, we see that the usual classification of De Santis’s novels, between texts for teenagers and texts for adults, lose consistency. In any case, we conclude that an overall reading of the author’s work should ignore this reductionist division.Neste artigo detémonos nunha novela particular do escritor arxentino Pablo De Santis: Lucas Lenz y el Museo del Universo (1992). Aínda que se trata dunha novela destinada a un público xuvenil, nela atopamos elementos propios do xénero negro. A caracterización do protagonista e episodios de violencia permítennos vincular a novela a temas ligados a un presunto público adulto. Deste xeito, vemos que a usual clasificación das novelas de De Santis entre textos de adolescentes e de adultos perde consistencia. En todo caso, concluímos que unha lectura global da obra do autor debería prescindir desta división reduccionista
One-dimensional infinite memory imitation models with noise
No full textIn this paper we study stochastic process indexed by Z constructed from certain
transition kernels depending on the whole past. These kernels prescribe that, at any time,
the current state is selected by looking only at a previous random instant. We characterize
uniqueness in terms of simple concepts concerning families of stochastic matrices, generalizing
the results previously obtained in De Santis and Piccioni (J Stat Phys 150(6):1017–1029,
2013)
A Numerical Comparison between Preisach, J-A and D-D-D Hysteresis Models in Computational Electromagnetics
No full textThe incorporation of hysteresis models in computational electromagnetic software is of paramount importance for the accurate prediction of the ferromagnetic devices’ performance. The Preisach and Jiles-Atherton (J-A) models are frequently used for this purpose. The former is more accurate and can represent a broad range of magnetic materials, but it is computationally expensive. The latter is more efficient but can accurately model only soft ferromagnetic materials. In this paper, a recently proposed hysteresis model, referred to as the D’Aloia-Di Francesco-De Santis (D-D-D) model, is shown to have the best trade-off between accuracy and computational burden. For the first time, a numerical comparison between the Preisach, J-A and D-D-D models is provided for a large class of hysteresis loops including soft, semi-hard and hard ferromagnetic materials
Tanino De Santis, Sibaritide a ritroso nel tempo
No full textMertens J. Tanino De Santis, Sibaritide a ritroso nel tempo. In: L'antiquité classique, Tome 29, fasc. 2, 1960. pp. 535-536
Tanino De Santis, Sibaritide a ritroso nel tempo
No full textMertens J. Tanino De Santis, Sibaritide a ritroso nel tempo. In: L'antiquité classique, Tome 29, fasc. 2, 1960. pp. 535-536
Ordona (Foggia), Cacciaguerra, in G. Volpe, J. Mertens, P. De Santis, Notiziario delle attività di tutela della Soprintendenza Archeologica della Puglia (Gennaio-Dicembre 1995).
No full textNotizia preliminare delle indagini svolte nel sito di Herdonia (FG) negli anni 1993-1994; le campagne di scavo hanno evidenziato una porzione dell'abitato di età medievale che si sviluppò, a partire dal XII secolo, lungo la strada che collegava il castrum alla zona occupata in età romana dall'anfiteatro
Nonlinear Prediction of the Geomagnetic Field
No full textRecent studies on the chaotic behaviour of the dynamical system producing the geomagnetic field , i.e. the geodynamo. These studies are based on secular variation data from observatories annual means (Barraclough and De Santis, 1997; De Santis et al., 2002), as well as on global models produced for the last century (De Santis et al., 2004), and have shown some interesting nonlinear properties. Suitable nonlinear techniques can be applied for short term prediction of the geomagnetic field, i.e. to extrapolate the field 1-2 years into the future. Using these methods it is possible to update maps of the
geomagnetic field for navigational purposes and to improve the prediction of the magnetic declination at heliports and airports. Declination values are important for the safety and security of all operations related to landing and take-off.Published281-2891.6. Osservazioni di geomagnetismo3.4. Geomagnetismo5.3. Banche dati di geomagnetismo, aeronomia, clima e ambientereserve
Nonlinear Prediction of the Geomagnetic Field
No full textRecent studies on the chaotic behaviour of the dynamical system producing the geomagnetic field , i.e. the geodynamo. These studies are based on secular variation data from observatories annual means (Barraclough and De Santis, 1997; De Santis et al., 2002), as well as on global models produced for the last century (De Santis et al., 2004), and have shown some interesting nonlinear properties. Suitable nonlinear techniques can be applied for short term prediction of the geomagnetic field, i.e. to extrapolate the field 1-2 years into the future. Using these methods it is possible to update maps of the
geomagnetic field for navigational purposes and to improve the prediction of the magnetic declination at heliports and airports. Declination values are important for the safety and security of all operations related to landing and take-off.Published281-2891.6. Osservazioni di geomagnetismo3.4. Geomagnetismo5.3. Banche dati di geomagnetismo, aeronomia, clima e ambientereserve
A Two-Stage Active-Set Algorithm for Bound-Constrained Optimization
No full textIn this paper, we describe a two-stage method for solving optimization problems with bound constraints. It combines the active-set estimate described in Facchinei and Lucidi (J Optim Theory Appl 85(2):265–289, 1995) with a modification of the non-monotone line search framework recently proposed in De Santis et al. (Comput Optim Appl 53(2):395–423, 2012). In the first stage, the algorithm exploits a property of the active-set estimate that ensures a significant reduction in the objective function when setting to the bounds all those variables estimated active. In the second stage, a truncated-Newton strategy is used in the subspace of the variables estimated non-active. In order to properly combine the two phases, a proximity check is included in the scheme. This new tool, together with the other theoretical features of the two stages, enables us to prove global convergence. Furthermore, under additional standard assumptions, we can show that the algorithm converges at a superlinear rate. Promising experimental results demonstrate the effectiveness of the proposed method
"DNA adsorption on inorganic surfaces and nanostructure growth".
No full textThe preparation of DNA-based nanostructures is usually accomplished in solution, by the controlled-temperature assembly of a number of oligonucleotides into complex, often multi-modular structures. Several techniques are then used to lay the nanostructures on solid surfaces, either to make them amenable to further studies with surface techniques (such as the atomic force microscope) or to integrate them on microfabricated devices.
The adsorption of nucleic acids on inorganic surfaces can take place with orientational preference as a function of the DNA base sequence. Evidence was obtained of the capability of the mica surface of recognising the two faces of a strongly curved DNA fragment.[1] The differential free energy involved in that recognition mechanism was estimated, and the modulation, by the same recognition process, of the conformational space accessible to a DNA molecule upon its deposition on mica was evidenced. On the basis of these data a tentative model based on sequence-dependent unbalances of the charge distribution along the chain is proposed. This model suggests that the crystal surface can recognise such unbalances of charge, and that the recognition process does not necessarily require curved tracts: it could act also in straights DNAs.[2]
A fine control of surface adsorption properties could also prove beneficial for the control and tailoring of DNA-based nanostructure growth, as this can be accomplished directly on surfaces. We have evidence that growing DNA nanostructures based on the stable Holliday junction could take place through only some of the possible pathways when performed on the surface, if compared to solution growth. We collected experimental data on a system based on the DNA parallelogram motif introduced by Prof. Seeman [3] where the assembly could be made more efficient to the point that kinetically-trapped unwanted structures could be avoided by forcing the growth to take place while all the components are adsorbed on a surface. As a fringe benefit, the reduction of dimensionality inherent in the surface adsorption enables the assembly to take place at strongly reduced oligonucleotide concentrations if compared to solution assembly.
[1] Sampaolese, B., Bergia, A., Scipioni, A., Zuccheri, G., Savino, M., Samorì, B., and De Santis, P. Recognition of the DNA sequence by an inorganic crystal surface. Proc Natl Acad Sci U S A, 2002. 99(21): p. 13566-70.
[2] Scipioni, A., Pisano, S., Bergia, A., Savino M., Samorì, B., and De Santis, P. Sequence-dependent DNA recognition by an inorganic crystal surface in the nanoscale (in pubbl.)
[3] Mao, C., W. Sun, and N.C. Seeman, Designed Two-Dimensional DNA Holliday Junction Arrays Visualized by Atomic Force Microscopy. J. Am. Chem. Soc., 1999. 121: p. 5437-544'
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