This paper revisits the contested issue of the impact of agricultural extension on farm productivity. Often studies in this …eld su¤er from a bias either due to self-selection of the best farmers for the extension services or to endogenous placement of the programme. The panel dataset collected by ANADERand the nature of the extension programme put into operation in Côte d’Ivoire between 1997 a...

The ctenophore Mnemiopsis leidyi A. Agassiz, 1865 is known to be eaten by the scyphomedusan Chrysaora quinquecirrha (Desor, 1948), which can control populations of ctenophores in the tributaries of Chesapeake Bay. In the summer of 1995, we videotaped interactions in large aquaria in order to determine whether M. leidyi was always captured after contact with medusae. Surprisingly, M. leidyi esca...

The scyphomedusa Chrysaora quinquecirrha and lobate ctenophore Mnemiopsis leidyi are dominant consumers in the planktivorous food web in Chesapeake Bay, USA, and are important predators throughout much of their ranges. Our studies in the Patuxent River (a subestuary of Chesapeake Bay) and its tributary creeks suggest successive waves of population spread and trophic influence of these 2 gelatin...

The main goal of this work is to provide an analysis methodology for assessment of water scarcity problems based on supply and demand. To this end, we must first determine what can be considered as supply and demand in the water scarcity problem. Although some variables involved are physical, economical or demographical, in our approach social factors are also included. This leads us to objecti...

BACKGROUND Cryptococcusgattii infections are being reported in the United States (US) with increasing frequency. Initially, US reports were primarily associated with an ongoing C. gattii outbreak in the Pacific Northwest (PNW) states of Washington and Oregon, starting in 2004. However, reports of C. gattii infections in patients from other US states have been increasing since 2009. Whether this...

The theme of the parables of the Lost Sheep and Lost Coin continue in the parable of the Lost Son, though now we have a longer, more personal story with three main characters. In this parable, the younger of two sons becomes unsettled with life on the family estate and requests his share of the inheritance, only to squander it recklessly in a foreign land. Upon his return home he is welcomed an...

It is an assumption of most models of syntax that phonological features are not present during syntactic derivations, thus cannot influence syntactic structure (cf. Pullum & Zwicky 1986, 1988 ). A process that might challenge such an assumption is phonologically determined agreement, where phonological and not syntactic or semantic features agree across elements in a clause or discourse. Such a...

A little personal history first. In 1971, at the invitation of la Commission française pour l’unesco, I took part in a colloque at the Centre national d'études spatiales on the use of satellites for education. We or some in the colloque were expecting them to revolutionise education. A few years later, instructional television, pioneered at the Ecole Normale St Cloud and further afield in Niger...

We investigate the relation between mobile phone usage and regional economic development in Côte d’Ivoire. Most previous studies on mobile phone communication focused on developed countries. Their results may be difficult to extend to developing countries. Here we study mobile communication in a developing nation, namely Côte d’Ivoire. Our main motivations are, first, that the effects of inform...

This paper proposes a microeconomic decomposition of the evolution of income inequality in Côte d’Ivoire in the 1990s, allowing the in-depth analysis of simultaneous contributions of four types of phenomena to the evolution of the distribution of income: a change in the remuneration rates of observed and unobserved earnings determinants, a change in occupational preferences, and a change in the...