Showing papers by "Paris West University Nanterre La Défense published in 1995"
TL;DR: Influences such as early experience or ‘sensory bias’ that may lead to a particular sexual sensitivity of female canaries to these types of song phrases are discussed.
255 citations
TL;DR: In this paper, the authors study a linear technology with simple assumption: an aggregate capital stock which represents a learning by doing effect and a pollution flow proportional to production, and analyse the precise effects on growth of the disutility of pollution and its interaction with the utility of consumption in an economy without abatement technology.
Abstract: Endogenous growth is generally built on a positive externality hypothesis which is the opposite of a negative externality caused by pollution. We study a linear technology with simple assumption: an aggregate capital stock which represents a learning by doing effect and a pollution flow proportional to production. In this framework, we analyse the precise effects on growth of the disutility of pollution and its interaction with the utility of consumption in an economy without abatement technology. The decentralized equilibrium always leads to unlimited growth, but optimal growth is often limited (the negative effect of pollution dominating the positive effect of learning by doing). In this case, the optimal policy which leads the decentralized economy to follow the optimal growth path is to tax capital; in contrast with the optimal subsidy policy in an economy without pollution. When an abatement technology is introduced, the optimal solution can lead the economy to unlimited growth, whatever the form of the utility function.
172 citations
TL;DR: In this article, a theoretical analysis of policies aiming at reducing the supply of agricultural produce through contractual or mandatory land set-aside is devoted to evaluate the impact of asymmetric information about yields on the optimal price support policy and on land set aside.
53 citations
TL;DR: The full symmetry analysis of the low-lying levels of the spin-1/2 Hamiltonian in the hypotheses of either a four- or a two-sublattice order is developed.
Abstract: On the triangular lattice, for ${\mathit{J}}_{2}$/${\mathit{J}}_{1}$ between 1/8 and 1, the classical Heisenberg model with first- and second-neighbor interactions presents four-sublattice ordered ground states. Spin-wave calculations of Chubukov and Jolicoeur and Korshunov suggest that quantum fluctuations select amongst these states a collinear two-sublattice order. From theoretical requirements, we develop the full symmetry analysis of the low-lying levels of the spin-1/2 Hamiltonian in the hypotheses of either a four- or a two-sublattice order. We show on the exact spectra of periodic samples (N=12, 16, and 28) how quantum fluctuations select the collinear order from the four-sublattice order.
36 citations
01 Jan 1995
TL;DR: Micronde is presented, a Matlab wavelet and wavelet packet toolbox for signals and images and its use both in command line and interface mode is illustrated.
Abstract: The purpose of this paper is to present Micronde, a Matlab wavelet and wavelet packet toolbox for signals and images. Micronde’s capabilities and organization are described and its use both in command line and interface mode are illustrated. Real or synthetic signals as well as images are used to present wavelet-based analysis, de-noising and compression.
35 citations
01 May 1995
TL;DR: A travers ce kaleidoscope est examine l'heritage transmis aux maitres bâtisseurs de l'epoque suivante, preromane et romane as discussed by the authors.
Abstract: Plus qu'a aucun autre siecle, c'est au VIIIe qu'architecture et liturgie se trouvent etroitement entrelacees. La raison principale reside dans la symbiose que, pour des raisons eminnement politiques, la jeune dynastie carolingienne opere alors avec la papaute. A travers ce kaleidoscope est examine l'heritage transmis aux maitres bâtisseurs de l'epoque suivante, preromane et romane. Un siecle joue, a cet egard, un role determinant: c'est Ie Xe, a tort repute comme ayant ete obscur: "saeculum obscurum". en realite, il constitue la courroie de transmission entre l'epoque carolingienne, heritiere de l'antiquite et novatrice en meme temps, et l'art de notre deuxieme millenaire commencant.
3 citations
2 citations
Journal Article•
TL;DR: In this paper, a theoretical framework for understanding international monetary regimes is provided, which suggests that the most promising idea to overcome systemic instability is the progressive development of a monetary constitution, and suggests that a ideia mais promissora for superar a instabilidade sistemica and a desenvolvimento progressivo de uma nova constituicao monetaria internacional.
Abstract: Os disturbios recentes dos mercados financeiros evidenciam a limitacao do G-7 para combate-los e tem colocado a necessidade de um sistema monetario internacional mais ordenado. O presente artigo pretende desenvolver uma estrutura teorica para a compreensao dos regimes monetarios internacionais. Sugere, como conclusao, que a ideia mais promissora para superar a instabilidade sistemica e a de um desenvolvimento progressivo de uma nova constituicao monetaria internacional.Abstract The recent disturbances in financial markets have emphasised the powerlessness of the G-7 and have awakened the wish for a more orderly international monetary system. The present paper aims to provide a theoretical framework for the understanding international monetary regimes. It suggests that the most promising idea to overcome systemic instability is the progressive development of a monetary constitution.
1 citations
01 Jan 1995
TL;DR: The effective hamiltonian describing spin 1/2 quantum antiferromagnetism of solids was introduced in 1928 by Heisenberg as discussed by the authors, and it was shown that the Neel state should be a quantum superposition of eigenstates of Eq. 1 degenerate in the thermodynamic limit.
Abstract: The effective hamiltonian describing spin 1/2 quantum antiferromagnetism of solids was introduced in 1928 by Heisenberg. It reads:
$$\mathcal{H} = \sum\limits_{{ }} {2J{{s}_{i}}.{{s}_{j}}}$$
(1)
where the sum on i and j runs on nearest neighbours of the lattice and the constant J is positive. As soon as 1932, Neel describes his own view of antiferromagnetism as resulting from the existence of two or more ferromagnetic sublattices arranged in such a way that the total magnetization of the lattice is zero (Figure. 1). It seems that this picture met a great skepticism from the theoreticians.1 At the beginning of the thirties L. Landau and C.J. Goerter argue that the eigenstates of Eq. 1 being also eigenstates of S2 cannot break the rotational invariance of the hamiltonian as the Neel solution does. P.W. Anderson was probably the first, in his seminal paper of 1952, to show the way towards the answer: the Neel state should be a quantum superposition of eigenstates of Eq. 1 degenerate in the thermodynamic limit.2