Migratory equilibria with invested remittances

L'article étudie la migration économique dans le cadre d'un modèle où les migrants peuvent investir une partie de leur épargne dans le pays d'origine. En particulier, un équilibre avec migration partielle est faisable. Dans ce cas, on démontre et teste empiriquement une relation positive entre nombre de migrants et le montant du transfert par migrant.Migration ; Motif d'investissement ; Politique migrante ; Transfert des migrants

The Boltzmann-Grad limit of the periodic Lorentz gas in two space dimensions

The periodic Lorentz gas is the dynamical system corresponding to the free motion of a point particle in a periodic system of fixed spherical obstacles of radius $r$ centered at the integer points, assuming all collisions of the particle with the obstacles to be elastic. In this Note, we study this motion on time intervals of order $1/r$ and in the limit as $r\to 0^+$, in the case of two space dimensions

Coherence in amalgamated algebra along an ideal

Let $f: A\rightarrow B$ be a ring homomorphism and let $J$ be an ideal of $B$. In this paper, we investigate the transfert of the property of coherence to the amalgamation $A\bowtie^{f}J$. We provide necessary and sufficient conditions for $A\bowtie^{f}J$ to be a coherent ring

Unpacking Knowing Integration: A Practice-based Study in Haute Cuisine

Nous proposons d'analyser l'intégration des connaissances à la source d'un avantage concurrentiel avec une approche pratique des organisations. Alors que la littérature s'est focalisée sur le transfert de connaissances et les relations entre communautés par le biais des objets frontière, nous considérons les relations intra-communauté et la façon dont les acteurs mobilisent, restructurent et créent des connaissances pour l'action. Dans une perspective pratique, la dynamique des connaissances est un phénomène situé dans un contexte social donné. Nous nous appuyons sur une phase empirique qualitative, par l'analyse de l'intégration des connaissances lors de la création de nouveaux plats au sein des équipes de cuisiniers de restaurants tri-étoilés.Apprentissage ; Avantage concurrentiel ; Connaissance ; Créativité ; Gastronomie ; Integration ; Transfert

Vibrational exciton-mediated quantum state transfert: a simple model

A communication protocol is proposed in which quantum state transfer is mediated by a vibrational exciton. We consider two distant molecular groups grafted on the sides of a lattice. These groups behave as two quantum computers where the information in encoded and received. The lattice plays the role of a communication channel along which the exciton propagates and interacts with a phonon bath. Special attention is paid for describing the system involving an exciton dressed by a single phonon mode. The Hamiltonian is thus solved exactly so that the relevance of the perturbation theory is checked. Within the nonadiabatic weak-coupling limit, it is shown that the system supports three quasi-degenerate states that define the relevant paths followed by the exciton to tunnel between the computers. When the model parameters are judiciously chosen, constructive interferences take place between these paths. Phonon-induced decoherence is minimized and a high-fidelity quantum state transfer occurs over a broad temperature range.Comment: 1

Assessing Devolution in the Canadian North: A Case Study of the Yukon Territory

Despite a rich literature on the political and constitutional development of the Canadian territorial North, few scholars have examined the post-devolution environment in Yukon. This lacuna is surprising since devolution is frequently cited as being crucial to the well-being of Northerners, leading both the Government of Nunavut and the Government of the Northwest Territories to lobby the federal government to devolve lands and resources to them. This paper provides an updated historical account of devolution in Yukon and assesses its impact on the territory since 2003. Relying mainly on written resources and 16 interviews with Aboriginal, government, and industry officials in the territory, it highlights some broad effects of devolution and specifically analyzes the processes of obtaining permits for land use and mining. Our findings suggest that devolution has generally had a positive effect on the territory, and in particular has led to more efficient and responsive land use and mining permit processes

Remobilisation of Zn and Pb in a mountain stream contaminated by mining wastes during a moderate flood event (Ariège, France)

The Lez stream drains an orphan mining (Zn and Pb) district, whose tailings are sources of contamination. The evolution of the dissolved and particular Zn and Pb content was studied to evaluate the role of a moderate flood event on the downstream metal tranfert. Although Zn and Pb behave differently, floods appear for both elements as preferential periods for metal fluxes

Asymptotic law of likelihood ratio for multilayer perceptron models

We consider regression models involving multilayer perceptrons (MLP) with one hidden layer and a Gaussian noise. The data are assumed to be generated by a true MLP model and the estimation of the parameters of the MLP is done by maximizing the likelihood of the model. When the number of hidden units of the true model is known, the asymptotic distribution of the maximum likelihood estimator (MLE) and the likelihood ratio (LR) statistic is easy to compute and converge to a $\chi^2$ law. However, if the number of hidden unit is over-estimated the Fischer information matrix of the model is singular and the asymptotic behavior of the MLE is unknown. This paper deals with this case, and gives the exact asymptotic law of the LR statistics. Namely, if the parameters of the MLP lie in a suitable compact set, we show that the LR statistics is the supremum of the square of a Gaussian process indexed by a class of limit score functions.Comment: 19 page

The Remittances Framework in Lesotho: Assessment of Policies and Programmes Promoting the Multiplier Effect

This study explored policies and programmes aimed at facilitating remittances inflows through formal channels and leveraging remittances for development in Lesotho. The study also looked into regulations and laws on remittances. In order to answer key questions of this study, semi‐structured questionnaires were administered to 29 institutions, including commercial banks, an asset manager, insurance companies, telecommunication companies, government ministries, parastatals, a research institution, a retailer, a savings and credit cooperative and non-governmental organizations. The gaps revealed by this study can be summarised as: the Deferred Pay Act is the only policy driving officially recorded remittance inflows to Lesotho and which facilitated the creation of remittances‐linked savings product by the banking sector; there are restrictions on remittance outflows for immigrants working in the country, though planned to be eliminated; most of remittances transfer products offered by various institutions suit regular income earners with bank accounts, the adoption of mobile‐phone based transfers adoption is low and the mobile‐phone based transfer products cannot be used to make international transfers; there is lack of adoption of remittances‐linked financial products by financial intermediaries and relevant government ministries; the benefits packaged with the remittances‐ linked savings accounts are less attractive; and most of the remittances services providers are concentrated in urban centres. These findings show there is a need to develop policies and programmes for harnessing remittances for development. This study concluded by suggesting policy options for facilitating remittances inflows through regular channels and promoting positive impact of remittances on development