199,452 research outputs found
M. Federico MARCON, Professeur invité à l'EHESS en avril-mai 2017
No full textM. Federico MARCON, Professeur à l'Université de Princeton, historien du Japon et spécialiste d'histoire des sciences, séjournera à Paris sur invitation de Guillaume Carré (CRJ-EHESS) et Aleksandra Kobiljski (IAO-CNRS-CRJ). Son projet de recherche en cours porte sur l’histoire de la monnaie dans le Japon des Tokugawa, en réunissant les sources sur les débats intellectuels et les pratiques financières des acteurs du terrain tels que les changeurs de monnaie. M. MARCON est l'auteur de "The Know..
Effects of the radial inflow of gas and galactic fountains on the chemical evolution of M 31
No full textContext. Galactic fountains and radial gas flows are very important ingredients for modeling the chemical evolution of galactic disks.
Aims: Our aim here is to study the effects of galactic fountains and radial gas flows on the chemical evolution of the disk of Andromeda (M 31) galaxy.
Methods: We adopt a ballistic method to study the effects of galactic fountains on the chemical enrichment of the M 31 disk by analyzing the landing coordinate of the fountains and the time delay in the pollution of the interstellar gas. To understand the consequences of radial flows, we adopt a very detailed chemical evolution model. Our aim is to study the formation of abundance gradients along the M 31 disk and also compare our results with the Milky Way.
Results: We find that the landing coordinate for the fountains in M 31 is no more than 1 kpc from the starting point, thus producing a negligible effect on the chemical evolution of the disk. We find that the delay time in the enrichment process due to fountains is no longer than 100 Myr, and this timescale also produces insignificant effects on the results. Then, we compute the chemical evolution of the M 31 disk with radial gas flows produced by the infall of extragalactic material and fountains. We find that a moderate inside-out formation of the disk, coupled with radial flows of variable speed, can reproduce the observed gradient very well. We also discuss the effects of other parameters, such as a threshold in the gas density for star formation and efficiency of star formation varying with the galactic radius.
Conclusions: We conclude that galactic fountains do not affect the chemical evolution of the M 31 disk. Including radial gas flows with an inside-out formation of the disk produces a very good agreement with observations. On the other hand, if radial flows are not considered, one should assume a threshold in the star formation and variable star formation efficiency, besides the inside-out formation to reproduce the data. We conclude that the most important physical processes in creating disk gradients are the inside-out formation and the radial gas flows. More data on abundance gradients both locally and at high redshift are necessary to confirm this conclusion
Abitare gli spazi di transizione? Dalla visione zenitale alla conoscenza percorso: il caso di Marcon
No full textUn saggio, incluso in un collettaneo, promosso dal COSES (un istituto di ricerca), che guarda al Veneto centrale, e a un comune di quell’hinterland (Marcon), e alla “città diffusa” – forma urbis recente - non solo sulla scorta della letteratura disciplinare, ma pure in base ad un corpus di “fonti” non convenzionali: interviste e fotografie che il comune di Marcon ha commissionato per capire quali siano i caratteri qualitativi e come sia percepito il territorio dagli abitanti. La riflessione cerca di comprendere come le fotografie e le immagini descrivano la città e i suoi interstizi, svelando aspetti e peculiarità non immediatamente percepibili
Proposta de modelo de adequação de processo de produção de cerâmica vermelha
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.O trabalho aqui apresentado, é uma contribuição para resolução do problema das indústrias de cerâmica vermelha do sul do Estado de Santa Catarina, que pretendem melhorar seus processos de produção, direcionado-os para a satisfação de seus consumidores e garantindo assim para suas empresas vantagem competitiva. A pesquisa mostra, além da realidade do setor cerâmica vermelha no Sul do Estado de Santa Catarina, uma amostra dos requisitos necessários para satisfazer os consumidores, no que diz respeito a blocos cerâmicos de vedação, mostrando a facilidade e a vantagem da aplicação do QFD (Desdobramento da Função Qualidade). A pesquisa mostra, com detalhes, como proceder para determinar e relacionar a voz dos consumidores, com as etapas do processo de produção e como garantir qualidade dos produtos, efetuando melhorias no processo, dispensando as opiniões pessoais, contando com a segurança de uma metodologia cientificamente definida. Além de propor o modelo, a pesquisa mostra, em números, o resultado da aplicação da metodologia em empresas da Região Sul. The paper here show, is a contribution for problem solving of red ceramic industries in the south of Santa Catarina state, which intend to improve their production processes by guiding them towards the satisfaction of their consumers, thus providing a competitive advantage for their companies. The reality of the red ceramic sector in the south of Santa Catarina. The research shows a sample of necessary requisites to please the consumers concerning sealing ceramic blocks, by showing the easiness and the advantage of QFD application. The research shows in details how to proceed in order to determine and relate the voice of the consumers, within the production process steps, and how to guarantee the quality of products, by making improvements in the process. Disallowing personal opinions, counting on the safety of a scientifically defined methodology. Despite proposing the model, the research shows in numbersthe results for applying the methodology in companies of the south region
- …
