• Other research productsclose
• 2013-2022close
• FR close
• English close
• Hal-Diderot close
• Mémoires en Sciences de l'Information et de la Communication close
• HAL Evry close
• Rural Digital Europe close

URL des Documents de travail : http://centredeconomie.univ-paris1.fr/documents-de-travail-du-ces/; Documents de travail du Centre d'Economie de la Sorbonne 2017.37 - ISSN : 1955-611X; This paper attempts to establish if climate acts as the determinant of destination choice in case of rural-to-rural migration. In the context of climate change where the link between climate and rural income has been well established, it is argued that migrants who move within rural areas choose destinations with more favourable climate conditions allowing for higher incomes. Employing the alternative-specific conditional logit model, this paper shows that such indirect effect of climate on migration destination choice is non-negligible, since one per cent increase in the expected income differentials between origin and destination, attributable to climate, increases the probability of choosing a given destination by at least nine percentage points. On the other hand, distance acts as a constraint for migration, in particular for the poorest individuals who might be inhibited from reaping full benefits of mobility.

Serie 2-9; This series was shot on October 28-31, 2019, in Jambi province (Sumatra), during visits I conducted, together with CIRAD researchers Jean Ollivier and Alexis Thoumazeau and partners from rural development NGOs and Jambi University professors, of several places and projects related to agronomic practices in the local oil palm production sector. I also visited, with the invitation of professor Aiyen Tjoa (universities of Jambi and Palu), the EFForTS research project of universities of Jambi and Gottingen, on the effects of landscape transformation associated with the development of rubber and oil palm plantations. The subjects include the warehouse of a local input supplier, a plant nursury, an oil palm mill, the plantation of an independent smallholder (in the area, many of the recent plantations are installed not by firms, but by independent farmers), the delivery of fresh fruits by smallholders to an intermediate collector with his truck, a meteorological station installed for the EFForTS project, plantation workers transported in a truck. I coordinate the research project EXPALMIND on the effects of plantation agriculture on land use and food security, funded by the Mutalim CNRS-INRAE fund in 2019-2021, and this project involved geographers from CNRS-LETG and CIRAD-Systèmes de pérennes, and my participation was part of that project.

Notice n°254433. Projet RELMIN : Le statut légal des minorités religieuses dans l’espace euro-méditerranéen (Ve-XVe siècle). http://www.cn-telma.fr/relmin/extrait254433/

Serie 2-8; This series was shot on October 28-31, 2019, in Jambi province (Sumatra), during visits I conducted, together with CIRAD researchers Jean Ollivier and Alexis Thoumazeau and partners from rural development NGOs and Jambi University professors, of several places and projects related to agronomic practices in the local oil palm production sector. I also visited, with the invitation of professor Aiyen Tjoa (universities of Jambi and Palu), the EFForTS research project of universities of Jambi and Gottingen, on the effects of landscape transformation associated with the development of rubber and oil palm plantations. The subjects include the warehouse of a local input supplier, a plant nursury, an oil palm mill, the plantation of an independent smallholder (in the area, many of the recent plantations are installed not by firms, but by independent farmers), the delivery of fresh fruits by smallholders to an intermediate collector with his truck, a meteorological station installed for the EFForTS project, plantation workers transported in a truck. I coordinate the research project EXPALMIND on the effects of plantation agriculture on land use and food security, funded by the Mutalim CNRS-INRAE fund in 2019-2021, and this project involved geographers from CNRS-LETG and CIRAD-Systèmes de pérennes, and my participation was part of that project.

With the modernisation of agriculture in Chongqing, a farm looks satisfied stands in front of his farm.

Serie 2-7; This series was shot on October 28-31, 2019, in Jambi province (Sumatra), during visits I conducted, together with CIRAD researchers Jean Ollivier and Alexis Thoumazeau and partners from rural development NGOs and Jambi University professors, of several places and projects related to agronomic practices in the local oil palm production sector. I also visited, with the invitation of professor Aiyen Tjoa (universities of Jambi and Palu), the EFForTS research project of universities of Jambi and Gottingen, on the effects of landscape transformation associated with the development of rubber and oil palm plantations. The subjects include the warehouse of a local input supplier, a plant nursury, an oil palm mill, the plantation of an independent smallholder (in the area, many of the recent plantations are installed not by firms, but by independent farmers), the delivery of fresh fruits by smallholders to an intermediate collector with his truck, a meteorological station installed for the EFForTS project, plantation workers transported in a truck. I coordinate the research project EXPALMIND on the effects of plantation agriculture on land use and food security, funded by the Mutalim CNRS-INRAE fund in 2019-2021, and this project involved geographers from CNRS-LETG and CIRAD-Systèmes de pérennes, and my participation was part of that project.

International audience; The goal of this document is to add to the efforts toward the long-sought objective of secure and safe robots with predictable and a priori known behavior. For this, we give operational semantics to GenoM3, a robotic framework, in terms of timed transition systems TTS. Then, a mathematically proven translation to timed automata extended with urgencies and data DUTA is derived from such semantics. Thus, we provide a mapping from functional components to verifiable models. Since TTS and DUTA are at the heart of a large corpus of formal verification languages and tools (such as UPPAAL, Fiacre, and RT-BIP), the semantics and its translation allow a correct mapping between GenoM3 and such languages/tools. This connection can then be automatized thanks to GenoM3 templates

This article tackles the multi-trip vehicle routing problem with time windows and limited duration. A trip is a timed route such that a succession of trips can be assigned to one vehicle. We provide an exact two-phase algorithm to solve it. The first phase enumerates possible ordered lists of clients which match the maximum trip duration criterion. The second phase uses a Branch and Price scheme to generate and choose a best set of trips so that all customers are visited. We propose a set covering formulation as the column generation master problem, where columns (variables) represent trips. The sub-problem selects appropriate timing for trips and has a pseudo-polynomial complexity. Computational results on Solomon's benchmarks are presented. The computational times obtained with our new algorithm are much lower than the ones recently obtained in the only two studies published on this problem to date.

Contribution au rapport

Présentation (Poster); The semi-arid southwestern Madagascan region is characterized by mangroves part of the Indo-Pacific phytochorie domain, providing numerous ecological, economical, social and cultural functions and values.These mangroves are under great anthropogenic pressures (salt production, shrimp farming, wood collection …), enhanced by climate change driving a catena of changes of the three rivers (Onilahy, Fiherenana and Manombo) hydrological and sedimentological functioning and of the coastal dunes of the region.The recent changes of mangroves are often only considered as degradation phenomena, ignoring the resilience capacity of these environments and of the socio-economic and cultural component in the associated landscape construction.In order to assess the much more complex contemporary dynamics and recent evolution of mangrove ecosystems and coastal dunes, we have used a retrospective diachronic aerial photography (1949) and satellite images (SPOT dated 1987 and 2014) processing of 5 different mangrove sites of the region of Toliara. This remote sensing monitoring have been combined with field surveys (2013 and 2014) consisting of transects for floristic identification (Avicennia marina, Sonneratia alba, Lumnitzera racemosa, Bruguiera gymnorhiza, Ceriops tagal, Rhizophora mucronata, Xylocarpus granatum), trunk diameter measures at Breast Height (DBH), counting of dead feet, cut trees and juveniles, complemented with the characterization of the environment (hydrography, siol, anthropization ...).The results reveal contrasted evolutions of the mangrove communities of Toliara region between development (Manombo-Fitsitike and Toliara I), stability (Mouth of the Onilahy) and regression (Ambondrolava and Ankiembe), related to a complex combination of anthropogenic (cutting pressure, clearing, reforestation ...) and natural (silt, sedimentary accretion ...) factors.