3,385 research outputs found
JESĂšS DOMĂŤNGUEZ SANABRIA, Ser religioso hoy. SĂntesis del contenido teolĂłgico, canĂłnico, espiritual de la vida religiosa, Madrid 1986, 317 págs [RECENSIĂ“N]
COMITÉ CANONIQUE DES RELIGIEUX, Directoire Canonique. Vie consacrée et sociétés de vie apostolique. Les Éditions du Cerf, Paris 1986, 320 págs [RECENSIÓN]
Complex dynamics of elementary cellular automata emerging from chaotic rules
We show techniques of analyzing complex dynamics of cellular automata (CA)
with chaotic behaviour. CA are well known computational substrates for studying
emergent collective behaviour, complexity, randomness and interaction between
order and chaotic systems. A number of attempts have been made to classify CA
functions on their space-time dynamics and to predict behaviour of any given
function. Examples include mechanical computation, \lambda{} and Z-parameters,
mean field theory, differential equations and number conserving features. We
aim to classify CA based on their behaviour when they act in a historical mode,
i.e. as CA with memory. We demonstrate that cell-state transition rules
enriched with memory quickly transform a chaotic system converging to a complex
global behaviour from almost any initial condition. Thus just in few steps we
can select chaotic rules without exhaustive computational experiments or
recurring to additional parameters. We provide analysis of well-known chaotic
functions in one-dimensional CA, and decompose dynamics of the automata using
majority memory exploring glider dynamics and reactions
Quantum Markovian activated surface diffusion of interacting adsorbates
A quantum Markovian activated atom-surface diffusion model with interacting
adsorbates is proposed for the intermediate scattering function, which is shown
to be complex-valued and factorizable into a classical-like and a
quantum-mechanical factor. Applications to the diffusion of Na atoms on flat
(weakly corrugated) and corrugated-Cu(001) surfaces at different coverages and
surface temperatures are analyzed. Quantum effects are relevant to diffusion at
low surface temperatures and coverages even for relatively heavy particles,
such as Na atoms, where transport by tunneling is absent.Comment: 6 pages, 4 figure
Exploring the dynamics of finite-energy Airy beams: A trajectory analysis perspective
In practice, Airy beams can only be reproduced in an approximate manner, with
a limited spatial extension and hence a finite energy content. To this end,
different procedures have been reported in the literature, based on a
convenient tuning of the transmission properties of aperture functions. In
order to investigate the effects generated by the truncation and hence the
propagation properties displayed by the designed beams, here we resort to a new
perspective based on a trajectory methodology, complementary to the density
plots more commonly used to study the intensity distribution propagation. We
consider three different aperture functions, which are convoluted with an ideal
Airy beam. As it is shown, the corresponding trajectories reveals a deeper
physical insight about the propagation dynamics exhibited by the beams analyzed
due to their direct connection with the local phase variations undergone by the
beams, which is in contrast with the global information provided by the usual
standard tools. Furthermore, we introduce a new parameter, namely, the escape
rate, which allow us to perform piecewise analyses of the intensity
distribution without producing any change on it, e.g., determining
unambiguously how much energy flux contributes to the leading maximum at each
stage of the propagation, or for how long self-accelerating transverse
propagation survives. The analysis presented in this work thus provides an
insight into the behavior of finite-energy Airy beams, and therefore is
expected to contribute to the design and applications exploiting this singular
type of beams.Comment: 14 pages, 5 figure
Cellular automaton supercolliders
Gliders in one-dimensional cellular automata are compact groups of
non-quiescent and non-ether patterns (ether represents a periodic background)
translating along automaton lattice. They are cellular-automaton analogous of
localizations or quasi-local collective excitations travelling in a spatially
extended non-linear medium. They can be considered as binary strings or symbols
travelling along a one-dimensional ring, interacting with each other and
changing their states, or symbolic values, as a result of interactions. We
analyse what types of interaction occur between gliders travelling on a
cellular automaton `cyclotron' and build a catalog of the most common
reactions. We demonstrate that collisions between gliders emulate the basic
types of interaction that occur between localizations in non-linear media:
fusion, elastic collision, and soliton-like collision. Computational outcomes
of a swarm of gliders circling on a one-dimensional torus are analysed via
implementation of cyclic tag systems
Housing bubbles and land planning corruption: evidence from Spain’s largest municipalities
Purpose: The purpose of this paper is to quantify to what extent the housing bubble in the early-to-mid 2000s in Spain exacerbated land planning corruption among Spain’s largest municipalities. Design/methodology/approach: The authors exploit plausibly exogenous variation in housing prices induced by changes in local mortgage market conditions; namely, the rapid expansion of savings banks (Cajas de Ahorros). Accounting for electoral competition in the 2003–2007 and 2007–2009 electoral cycles among Spanish municipalities larger than 25, 000 inhabitants, the authors estimate a positive relationship between housing prices and land planning corruption in municipalities with variation in savings bank establishments using instrumental variables techniques. Findings: A 1% increase in housing prices leads to a 3.9% points increase in the probability of land planning corruption. Moreover, absolute majority governments (not needing other parties’ support) are more susceptible to the incidence of corruption than non-majority ones. Two policy implications to address corruption emerge: enhance electoral competition and increase scrutiny over land planning decisions in sparsely populated. Originality/value: First empirical evidence of a formal link between the 2000s housing bubble in Spain and land planning corruption
Synthesis of functionalized triblock copolyesters derived from lactic acid and macrolactones for bone tissue regeneration
Synthetic and functional grafts are a great alternative to conventional grafts. They can provide a physical support and the precise signaling for cells to heal damaged tissues. In this study, a novel RGD peptide end-functionalized poly(ethylene glycol)-b-poly(lactic acid)-b-poly(globalide)-b-poly(lactic acid)-b-poly(ethylene glycol) (RGD-PEG-PLA-PGl-PLA-PEG-RGD) is synthetized and used to prepare functional scaffolds. The PGl inner block is obtained by enzymatic ring-opening polymerization of globalide. The outer PLA blocks are obtained by ring-opening polymerization of both, l-lactide or a racemic mixture, initiated by the α-ω-telechelic polymacrolactone. The presence of PGl inner block enhances the toughness of PLA-based scaffolds, with an increase of the elongation at break up to 300% when the longer block of PGl is used. PLA-PGl-PLA copolymer is coupled with α-ω-telechelic PEG diacids by esterification reaction. PEGylation provides hydrophilic scaffolds as the contact angle is reduced from 114° to 74.8°. That difference improves the contact between the scaffolds and the culture media. Moreover, the scaffolds are functionalized with RGD peptides at the surface significantly enhancing the adhesion and proliferation of bone marrow-derived primary mesenchymal stem cells and MC3T3-E1 cell lines in vitro. These results place this multifunctional polymer as a great candidate for the preparation of temporary grafts
CMB anisotropy: deviations from Gaussianity due to non-linear gravity
Non-linear evolution of cosmological energy density fluctuations triggers
deviations from Gaussianity in the temperature distribution of the cosmic
microwave background. A method to estimate these deviations is proposed. N-body
simulations -- in a CDM cosmology -- are used to simulate the strongly
non-linear evolution of cosmological structures. It is proved that these
simulations can be combined with the potential approximation to calculate the
statistical moments of the CMB anisotropies produced by non-linear gravity.
Some of these moments are computed and the resulting values are different from
those corresponding to Gaussianity.Comment: 6 latex pages with mn.sty, 3 eps figures. Accepted in MNRA
JesĂşs, Hijo de Dios, en el evangelio de Mateo
«La Sagrada Escritura es la Palabra de Dios en cuanto
consignada por escrito bajo la inspiraciĂłn del EspĂritu Santo»
(VATICANO II, Const. Dei Verbum, 9). Desde los primeros
tiempos hasta nuestros dĂas, la Biblia ha tenido una gran relevancia
en la vida de la Iglesia: «La Biblia no ha dejado de vivir
en la Iglesia. En el seno de la Iglesia fue escrita y no ha
cesado de ser leĂda, meditada, entendida, comentada, expuesta,
aplicada a las cuestiones teóricas y prácticas, colectivas e
individuales del dogma y de la moral...» Q. M. CASCIARO, Escritos
sobre cristologta del Nuevo Testamento, Pamplona
1982, p. 17).
Una cuestión de la máxima importancia, contenida en
la Sagrada Escritura y enseñada por la Iglesia, es la filiación
divina natural de Cristo, porque «quien confesare que Jesús
es el Hijo de Dios permanece en él y él en Dios» 0o 4,15).
En el Kerygma postpascual JesĂşs es denominado con el tĂtulo
de «Hijo de Dios». Lucas presenta como tema fundamental de
los discursos de Pablo esta realidad: «Jesús es el Hijo de
Dios» (Act 9, 20). Pero los evangelios sinópticos «quieren trazar
una imagen del JesĂşs prepascual y de su historia, de su
actuación, de su destino, de su persona rodeada de misterio»
Q. R. GEISELMANN, Jesucristo en Conceptos fundamentales de
TeologĂa, Madrid 1966, tomo II, p. 431)
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