59 research outputs found
Quinet (B.), Begue (P.) Étude épidémiologique des enfants migrants : expérience parisienne
No full textCharbit Yves. Quinet (B.), Begue (P.) Étude épidémiologique des enfants migrants : expérience parisienne . In: Revue européenne des migrations internationales, vol. 6, n°3,1990. p. 170
Eco-ethologie de la récolte de nourriture chez lasius fuliginosus (LATREILLES) (HYMENOPTERA: FORMICIDAE)
No full textDoctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
Spatiotemporal evolution of the trail network in Lasius fuliginosus (Hymenoptera, Formicidae)
No full textIn Lasius fuliginosus, the existence of a permanent trail system, stable during a season and practically unchanged from one year to the next, was confirmed. These trails radiate from the nest and lead the foragers to trees and shrubs colonized by aphids where they collect honeydew. Other kinds of trails were observed: temporary honeydew collecting trails, temporary hunting trails and ephemeral recruitment trails. -from AuthorsSCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe
Do desamparo à dor de existir na poesia de Flobela Espanca: alguns apontamentos
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-Graduação em Psicologia, Florianópolis, 2014.A questão central dessa pesquisa é se a dor que Florbela descreve em seus versos poéticos tem como motivo o que Freud denominava desamparo. Trabalhamos aqui as relações do desamparo freudiano com a dor de existir na perspectiva teórica psicanalítica. A poesia de Florbela Espanca apresentada ilustra as relações do desamparo com a dor de existir. Utilizou-se do método de análise discursiva de base psicanalítica, extraindo dos trechos poéticos sentidos coerentes com essa perspectiva de análise. Realizamos uma revisão bibliográfica do tema do desamparo na teoria freudiana. Examinando os poemas escritos de 1903 a 1917, constatamos que o desamparo e a dor de existir apresentam-se na posição melancólica nas personagens da poesia de Florbela Espanca.Abstract : This text aims to discuss some effects of "Helplessness" (the Freudian idea of "Hilflosigkeit") in Florbela Espanca's poetry. Examining the author's discourse from a psychoanalytic point of view, the work tries to make the pain that the Portuguese author often describes in her verses understandable. The main conclusion is that Florbela's characters show helplessness and existential pain in a way that is typical of the melancholic position
Worker Reproduction in the Highly Polygynous Ant Crematogaster pygmaea Forel, 1904 (Hymenoptera: Formicidae)
No full textIn most ant species, workers have retained functional ovaries, allowing them to potentially lay viable unfertilized eggs that develop into males. Mechanisms (ex.: queen and/or worker policing) have nevertheless evolved to control worker reproduction when the queen is present. In many species with a high degree of polygyny, especially in tramp species, complete sterility of workers has evolved, presumably to “trap” them within their “worker phenotype”. Our study showed for the first time that in the highly polygynous and polydomous ant Crematogaster pygmaea, workers retained the full capacity to produce reproductive eggs in queenless colonies, with at least some of them developing in adult males. We provide evidence that worker-produced males are reproductively functional. Although most queenless colonies produced eggs, few larvae developed into pupae and adult males. We conclude that workers strongly police the worker-produced offspring, even in the queen's absence. Probable high relatedness between queens of C. pygmaea colonies and strong genetic proximity between brood and workers could force the workers in their helper, non-reproductive function even if they keep the ability to reproduce. Our observations indicate that the production of adult males and gynes in C. pygmaea is controlled by seasonal factors related to the rainy season
Forecasting the demand for privatized transport - What economic regulators should know, and why
No full textForecasting has long been a challenge, and will remain so for the foreseeable future. But the analytical instruments and data processing capabilities available through the latest technology, and software, should allow much better forecasting than transport ministries, or regulatory agencies typically observe. Privatization brings new needs for demand forecasting. More attention is paid to risk under privatization, than when investments are publicly financed. And regulators must be able to judge traffic studies done by operators, and to learn what strategic behavior influenced these studies. Many governments, and regulators avoid good demand, modeling out of lack of conviction that theory, and models can do better than the"old hands"of the sector. This is dangerous when privatization changes the nature of business. For projects amounting to investments of 100,000-200,000 is not a reason to reject a reasonable modeling effort. And some private forecasting firms are willing to sell guarantees, or insurance with their forecasts, to cover significant gaps between forecasts, and reality.Markets and Market Access,Environmental Economics&Policies,Economic Theory&Research,Decentralization,Banks&Banking Reform,Markets and Market Access,Economic Theory&Research,Banks&Banking Reform,Access to Markets,Environmental Economics&Policies
Programming, optimal pricing and partnership contract for infrastructures in PPPs
No full textThe development of various forms of public-private partnerships for the financing, building and operating of public infrastructure has not fundamentally altered the economic calculations involved. This chapter examines to what extent it is necessary, however, to change the way that government uses socio-economic and financial evaluations, whether to optimise investment programming or pricing. Ensuring a coherent match between these two types of optimisation can provide a principle for determining the optimal programming price. We begin by showing that when projects are financed by both users (toll revenues) and taxpayers (subsidies), it is socially beneficial to plan these investments on the basis of the net present value (NPV) provided by each unit of public money invested. This NPV/subsidy ratio must obviously be higher than the public-funding scarcity coefficient or else the investment would destroy more wealth than it would produce. One of the ways of improving this ratio is also to optimise the toll level, since increasing it can lower the subsidy but has an adverse impact on the user surplus, it is essential to set the optimal toll. In the case of an approved project considered in isolation, we show that the optimal toll depends upon the public-funding scarcity coefficient. If there is no scarcity, the optimal toll is zero. As public-funding becomes scarcer, the optimal toll draws closer to the toll that optimises revenue. In the case of a programme of several projects subject to budget constraint, we show that the optimal toll no longer depends upon the public-funding scarcity coefficient and that there are several scenarios depending on the relative values of the maximum revenue and the total cost of the project: − when, whatever the toll, revenue can no longer cover over half of the cost, it is socially beneficial to choose not to levy any toll; − when there is a toll that covers the total cost, the operator may be left free to set it at the level he sees fit, with the issue of how the profits are to be shared between the franchisee and the franchisor being settled separately; − when the maximum revenue of the project falls between half and all of the total cost, the value of the toll that maximises the welfare function is lower than the revenue-maximising toll and must therefore be set for the private operator by government. Thus, the partnership contract must be given a different content in these three cases of optimal pricing.PPP ; Programming ; Financing ; Pricing
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