PoGOLite - A High Sensitivity Balloon-Borne Soft Gamma-ray Polarimeter

We describe a new balloon-borne instrument (PoGOLite) capable of detecting 10% polarisation from 200mCrab point-like sources between 25 and 80keV in one 6 hour flight. Polarisation measurements in the soft gamma-ray band are expected to provide a powerful probe into high-energy emission mechanisms as well as the distribution of magnetic fields, radiation fields and interstellar matter. At present, only exploratory polarisation measurements have been carried out in the soft gamma-ray band. Reduction of the large background produced by cosmic-ray particles has been the biggest challenge. PoGOLite uses Compton scattering and photo-absorption in an array of 217 well-type phoswich detector cells made of plastic and BGO scintillators surrounded by a BGO anticoincidence shield and a thick polyethylene neutron shield. The narrow FOV (1.25msr) obtained with well-type phoswich detector technology and the use of thick background shields enhance the detected S/N ratio. Event selections based on recorded phototube waveforms and Compton kinematics reduce the background to that expected for a 40-100mCrab source between 25 and 50keV. A 6 hour observation on the Crab will differentiate between the Polar Cap/Slot Gap, Outer Gap, and Caustic models with greater than 5 sigma; and also cleanly identify the Compton reflection component in the Cygnus X-1 hard state. The first flight is planned for 2010 and long-duration flights from Sweden to Northern Canada are foreseen thereafter.Comment: 11 pages, 11 figures, 2 table

No caminho para o urbanismo. Saturnino de Brito e Édouard Imbeaux, trajetórias profissionais entre Brasil e França

The aim of this work is to establish a dialogue between the professional trajectories of two engineers: Saturnino de Brito (1864-1929) and Édouard Imbeaux (1861-1943). They both focussed on the city as object of action and reflection based on an innovative knowledge of hygiene and sanitation issues. The specificity of these trajectories is the association of practice, theoretical reflection and dissemination: these two professionals respectively contributed, in their countries, to the construction of Town planning as a discipline, in particular in relation to its technical approach. The international scene is an important dimension of their activity as it made possible the circulation / comparison of technical knowledge between Europe and Brazil and it contributed to find a specific and appropriate response to the problems of the city. The interaction of local, national and international scene allows another perspective of the professional trajectories of Saturnino de Brito and Edouard Imbeaux.O objetivo deste trabalho é estabelecer um diálogo entre duas trajetórias profissionais, a de Saturnino de Brito (1864-1929) e a de Édouard Imbeaux (1861-1943), que privilegiaram a cidade como objeto de ação e de reflexão, as quais são construídas a partir de um conhecimento inovador sobre as questões de higiene e saneamento. A especificidade desses percursos é a associação da prática com a reflexão teórica e sua difusão: estes dois profissionais contribuíram, assim, cada um em seu país, para a construção da disciplina urbanística, especialmente em sua abordagem técnica. O cenário internacional constitui uma dimensão importante de sua ação, que tornou possível a circulação/confronto de saberes técnicos entre Europa e Brasil e contribuiu com a pesquisa de uma resposta concreta e adaptada aos problemas da cidade. A interação do cenário local, nacional e internacional permite trazer um outro olhar sobre as trajetórias profissionais de Saturnino de Brito e Édouard Imbeaux

Marcel Roncayolo : Lectures de villes. Formes et temps

Montigny Gilles. Marcel Roncayolo : Lectures de villes. Formes et temps. In: Espace, populations, sociétés, 2003-2. Tourisme et dynamiques démographiques. p. 365

Guy Burgel : Paris, avenir de la France

Montigny Gilles. Guy Burgel : Paris, avenir de la France. In: Espace, populations, sociétés, 1999-2. Les mobilités spatiales. pp. 371-372

Frédéric Dufaux, Annie Fourcaut, Rémy Skoutelsky : Faire l'histoire des grands ensembles. Bibliographie 1950-1980

Montigny Gilles. Frédéric Dufaux, Annie Fourcaut, Rémy Skoutelsky : Faire l'histoire des grands ensembles. Bibliographie 1950-1980. In: Espace, populations, sociétés, 2003-3. Populations, élections, territoires. p. 561

Pierre Lassave, Les sociologues et la recherche urbaine dans la France contemporaine

Montigny Gilles. Pierre Lassave, Les sociologues et la recherche urbaine dans la France contemporaine. In: Annales. Histoire, Sciences Sociales. 53ᵉ année, N. 2, 1998. pp. 431-433

Roncayalo Marcel : Les grammaires d'une ville. Essai sur la genèse des structures urbaines à Marseille

Montigny Gilles. Roncayalo Marcel : Les grammaires d'une ville. Essai sur la genèse des structures urbaines à Marseille. In: Espace, populations, sociétés, 1997-1. Les populations du monde arabe - People of the Arab Middle East. pp. 104-105

Ferreol Gilles (sous la direction de ...) : Intégration, lien social et citoyenneté

Montigny Gilles. Ferreol Gilles (sous la direction de ...) : Intégration, lien social et citoyenneté. In: Espace, populations, sociétés, 1999-1. Les populations de l'Afrique subsaharienne. pp. 162-163