Search results for "Canon"
showing 10 items of 446 documents
Coordinates for quasi-Fuchsian punctured torus space
1998
We consider complex Fenchel-Nielsen coordinates on the quasi-Fuchsian space of punctured tori. These coordinates arise from a generalisation of Kra's plumbing construction and are related to earthquakes on Teichmueller space. They also allow us to interpolate between two coordinate systems on Teichmueller space, namely the classical Fuchsian space with Fenchel-Nielsen coordinates and the Maskit embedding. We also show how they relate to the pleating coordinates of Keen and Series.
Construction of canonical coordinates for exponential Lie groups
2009
Given an exponential Lie group G, we show that the constructions of B. Currey, 1992, go through for a less restrictive choice of the Jordan-Holder basis. Thus we obtain a stratification of g * into G-invariant algebraic subsets, and for each such subset Ω, an explicit cross-section Σ C Ω for coadjoint orbits in Ω, so that each pair (Ω, Σ) behaves predictably under the associated restriction maps on g * . The cross-section mapping σ: Ω → Σ is explicitly shown to be real analytic. The associated Vergne polarizations are not necessarily real even in the nilpotent case, and vary rationally with ∈ Ω. For each Ω, algebras e 0 (Ω) and e 1 (Ω) of polarized and quantizable functions, respectively, a…
Le ‘for de la conscience’. L’invention d’une nouvelle frontière juridictionnelle (XIIIe siècle)
2013
International audience; En droit canonique, le "for" désigne tout ressort judiciaire territorial, laïc ou ecclésiastique, dont la compétence varie selon le statut des personnes jugées – un juge séculier ne pouvant, sauf exceptions, juger un clerc, et réciproquement, l’évêque ou son "official" ne jugeant les laïcs que dans certaines causes réservées à l’Église (matrimoniales, notamment). À la marge de ce "for", un nouvel espace de jugement semble s’ouvrir à la fin du XIIe et au tout début du XIIIe siècle : le "for de la pénitence", que le théologien Thomas d'Aquin assimile, au milieu du XIIIe siècle, au "for de la conscience". Cet article montre comment l'Église a, sur le plan de la pratique…
A New Monte Carlo Method for the Titration of Molecules and Minerals
2007
The charge state of molecules and solid/liquid interfaces is of paramount importance in the understanding of the reactivity and the physico-chemical properties of many systems. In this work, we porpose a new Monte Carlo method in the grand canonical ensemble using the primitive model, which allows us to simulate the titration behavior of macromolecules or solids at constant pH. The method is applied to the charging process of colloidal silica particles dispersed in a sodium salt solution for various concentrations and calcium silicate hydrate nano-particles in a calcium hydroxide solution. An excellent agreement is found between the experimental and simulated results.
From where do quantum groups come?
1993
The phase space realizations of quantum groups are discussed using *-products. We show that on phase space, quantum groups appear necessarily as two-parameter deformation structures, one parameter (v) being concerned with the quantization in phase space, the other (η) expressing the quantum groups as “deformation” of their Lie counterparts. Introducing a strong invariance condition, we show the uniqueness of the η-deformation. This suggests that the strong invariance condition is a possible origin of the quantum groups.
Construction of pseudo-bosons systems
2010
In a recent paper we have considered an explicit model of a PT-symmetric system based on a modification of the canonical commutation relation. We have introduced the so-called {\em pseudo-bosons}, and the role of Riesz bases in this context has been analyzed in detail. In this paper we consider a general construction of pseudo-bosons based on an explicit {coordinate-representation}, extending what is usually done in ordinary supersymmetric quantum mechanics. We also discuss an example arising from a linear modification of standard creation and annihilation operators, and we analyze its connection with coherent states.
Phase transitions and quantum effects in adsorbed monolayers
1996
Phase transitions in absorbed (two-dimensional) fluids and in absorbed layers of linear molecules are studied with a combination of path integral Monte Carlo (PIMC), Gibbs ensemble Monte Carlo (GEMC), and finite size scaling techniques. For a classical (nonadditive) hard-disk fluid the “critical” nonadditivities, where the entropy-driven phase separations set in, are presented. For a fluid with internal quantum states the gas-liquid coexistence region, tricritical, and triple points can be determined, and a comparison with density functional (DFT) results shows good agreement for the freezing densities. LinearN 2 molecules adsorbed on graphite (in the √3 × √3 structure) show a transition fr…
La Academia y sus cánones lexicográficos y gramaticales: el flujo oscilante de la información
2010
Lo studio é stato edito su un numero monografico che ha visto la partecipazioni di specialisti nel settore appartenenti a diverse universitá.
Principio di cooperazione, rapporti con le confessioni minoritarie e problemi di rappresentanza. Uno sguardo all’esperienza latinoamericana
2011
Testo della relazione tenuta al Convegno di studi sul tema “La rappresentatività istituzionale delle confessioni religiose prive di intesa” (Palermo, 21-22 maggio 2010) organizzato dall’Università di Palermo, destinata alla pubblicazione negli Atti. SOMMARIO: 1. Premessa - 2. La condizione dei culti minoritari in America Latina: cambiamenti in corso - 3. I rapporti con le confessioni religiose non registrate o non ammesse alla concertazione. Normative nazionali a confronto – 4. Il problema dei culti “ancestrali” – 5. Alcune conclusioni.
Coadsorption of NRR and HER Intermediates Determines the Performance of Ru-N4 toward Electrocatalytic N2 Reduction
2021
Efficiency of the electrochemical N2 reduction reaction (NRR) to ammonia is seriously limited by the competing hydrogen evolution reaction (HER) but our current atomic-scale insight on the factors controlling HER/NRR competition are unknown. Herein we unveil the elementary mechanism, thermodynamics, and kinetics determining the HER/NRR selectivity on the state-of-the-art NRR electrocatalyst, Ru-N4 using constant potential density functional theory calculations (DFT). The calculations show that NRR and HER intermediates coadsorb on the catalyst where HER is greatly suppressed by the NRR intermediates. The first reaction step leading to either *NNH or *H determines the selectivity towards NRR…