93,219 research outputs found
Octavio Cordero Palacios
No full textOctavio Cordero Palacios (born Santa Rosa, Cuenca (Ecuador), May 3, 1870 – died December 17, 1930)[1] was an Ecuadorian writer, playwright, poet, mathematician, engineer, surveyor, journalist, lawyer, polyglot, Latinist, professor and inventor[2][3]. He was fluent in Latin, Greek, English and French in addition to Spanish.[4].Octavio Cordero Palacios (n. Santa Rosa, Cuenca (Ecuador), 3 de mayo de 1870 – f. 17 de diciembre de 1930)[1] fue un escritor, dramaturgo, poeta, matemático, ingeniero, topógrafo, periodista, abogado, poliglota, latinista, profesor e inventor ecuatoriano[2][3]. Dominaba el Latín, Griego, Inglés y Frances además del Español[4]
Colloquio su Cultura, Diritto e Ragione. Intervista immaginaria al prof. Franco Cordero (A.D. 2023)
No full textThe imaginary interview with Professor Franco Cordero systematically reproposes
the elements of his general conception of law, of which the particular link between the cultural dimension and the strong logical-rational instance
is highlighted
Characterization of Smooth Symbol Classes by Gabor Matrix Decay
No full textFor m∈ R we consider the symbol classes Sm, m∈ R, consisting of smooth functions σ on R2d such that | ∂ασ(z) | ≤ Cα(1 + | z| 2) m/2, z∈ R2d, and we show that can be characterized by an intersection of different types of modulation spaces. In the case m= 0 we recapture the Hörmander class S0,00 that can be obtained by intersection of suitable Besov spaces as well. Such spaces contain the Shubin classes Γρm, 0 < ρ≤ 1 , and can be viewed as their limit case ρ= 0. We exhibit almost diagonalization properties for the Gabor matrix of τ-pseudodifferential operators with symbols in such classes, extending the characterization proved by Gröchenig and Rzeszotnik (Ann Inst Fourier 58(7):2279–2314, 2008). Finally, we compute the Gabor matrix of a Born–Jordan operator, which allows to prove new boundedness results for such operators
Anelastic relaxation from hydrogen and other defects in La-doped BaTiO3
No full textWe present anelastic spectroscopy measurements between 2 and 500 K in Ba1-xLaxTiO3 (0.10 <= x <= 0.20). The phase transitions of pure BaTiO3 are shifted to lower temperature by increasing the La doping and are completely suppressed starting from x = 0.15. The samples are expected to contain H impurities since sintering was performed in flowing H-2 to ensure electronic rather than cation vacancy compensation, and indeed at least three relaxation processes of the complex anelastic spectrum are strongly influenced by annealing the samples in CO or H-2 at 1450 K. A thermally activated anelastic peak around 250 K (f similar to 2 kHz) is ascribable to H hopping between different O atoms, while a possible indication of fast reorientation around a same O atom comes from a broad peak around 100 K. At least other three relaxation processes are present between 30 and 150 K, but the present data do not allow their nature to be ascertained; possible mechanisms involve polarons and hopping of Ti and possibly 12 among off-centre positions. (C) 2009 Elsevier B.V. All rights reserved
Sharp integral bounds for Wigner distributions
No full textThe cross-Wigner distribution of two functions or temperate
distributions is a fundamental tool in quantum mechanics and in signal
analysis. Usually, in applications in time-frequency analysis and
belong to some modulation space and it is important to know which modulation
spaces belongs to. Although several particular sufficient conditions
have been appeared in this connection, the general problem remains open. In the
present paper we solve completely this issue by providing the full range of
modulation spaces in which the continuity of the cross-Wigner distribution
holds, as a function of . The case of weighted modulation spaces
is also considered. The consequences of our results are manifold: new bounds
for the short-time Fourier transform and the ambiguity function, boundedness
results for pseudodifferential (in particular, localization) operators and
properties of the Cohen class
Analytic features of reproducing groups for the metaplectic representation
No full textWe introduce the notion of admissible subgroup H of G = H^d \rtimes Sp(d,R) relative to the (extended) metaplectic representation μ_e via the Wigner distribution. Under mild additional assumptions, it is shown to be equivalent to the fact that the identity f= \int_H \la f,μ_e(h) φ \ra μ_e(h) φ dh holds (weakly) for all f ∈ L^2(R^d ). We use this equivalence to exhibit classes of admissible subgroups of Sp(2,R). We also establish some connections with wavelet theory, i.e., with curvelet and contourlet frame
a propósito de Isabella Cosse, Pareja, sexualidad y familiaen los años sesenta. Una revolución discreta en Buenos Aires, Buenos Aires,Siglo Veintiuno Editores, 2010
No full textLaura F. Cordero, a propósito de Isabella Cosse, Pareja, sexualidad y familiaen los años sesenta. Una revolución discreta en Buenos Aires, Buenos Aires,Siglo Veintiuno Editores, 201
Octahedral tilting, monoclinic phase and the phase diagram of PZT
No full textAnelastic and dielectric spectroscopy measurements on PbZr1-xTixO3 (PZT) close to the morphotropic (MPB) and antiferroelectric boundaries provide new insight into some controversial aspects of its phase diagram. No evidence is found of a border separating monoclinic (M) from rhombohedral (R) phases, in agreement with recent structural studies supporting a coexistence of the two phases over a broad composition range x < 0.5, with the fraction of M increasing toward the MPB. It is also discussed why the observed maximum of elastic compliance appears to be due to a rotational instability of the polarization linearly coupled to shear strain. Therefore it cannot be explained by extrinsic softening from finely twinned R phase alone, but indicates the presence also of M phase, not necessarily homogeneous. A new diffuse transition is found within the ferroelectric phase near x similar to 0.1, at a temperature T-IT higher than the well established boundary T-T to the phase with tilted octahedra. It is proposed that around T-IT the octahedra start rotating in a disordered manner and finally become ordered below T-T. In this interpretation, the onset temperature for octahedral tilting monotonically increases up to the antiferroelectric transition of PbZrO3, and the depression of T-T(x) below x = 0.18 would be a consequence of the partial relief of the mismatch between the average cation radii with the initial stage of tilting below T-IT
El lenguaje multimedial en la O.V Presentación de un video como técnica disparadora
No full textFil: Mai, Lilia. Universidad Católica de Santa Fe ; ArgentinaFil: Cordero, Mariela. Universidad Católica de Santa Fe ; Argentina5to. Congreso Internacional de Educación Escuela: más allá de los límitesSanta FeArgentina12, 13 y 14 de junio de 2008Universidad Católica de Santa F
Cluster spin glass phase and charge stripe fluctuations in the high TC superconductor La2-xSrxCuO4
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