50,368 research outputs found
âI went with what I always doâŠâ:a qualitative analysis of âCleggmaniaâ and vote choice in the 2010 British General Election
Dynamic nonlinear analyses for the 4-storey infilled R/C frame: study of a retrofitting solution
A research project on assessment and retrofitting of R/C frame structures is currently being developed under the research programme of the ICONS TMR-research network. This paper presents and discusses the preliminary experimental results from a 4-storey bare frame representative of the common practice of 40~50 years ago in most south European countries and devotes special attention to the study of a retrofitting solution based on bracing and rubber dissipaters, which intends to increase stiffness and damping reducing consequently the earthquake deformation demands.O estudo aqui apresentado concentra-se numa solução de reforço de um pĂłrtico utilizando contraventamentos (k-bracing) com perfis de aço em conjunto com elementos elastomĂ©ricos de dissipação. Os resultados das anĂĄlises nĂŁo lineares da estrutura com e sem alvenaria e com reforço sĂŁo apresentados e discutidos. Na segunda parte da comunicação apresentam-se os resultados experimentais jĂĄ disponĂveis e discute-se o problema da modelação recorrendo aos resultados experimentais e comparando os resultados obtidos com diferentes tipos de modelos
Three-dimensional quantum electrodynamics as an effective interaction
We obtain a Quantum Electrodynamics in 2+1 dimensions by applying a
Kaluza--Klein type method of dimensional reduction to Quantum Electrodynamics
in 3+1 dimensions rendering the model more realistic to application in
solid-state systems, invariant under translations in one direction. We show
that the model obtained leads to an effective action exhibiting an interesting
phase structure and that the generated Chern--Simons term survives only in the
broken phase.Comment: 10 pages in Plain Te
Household income as a determinant of child labor and school enrollment in Brazil: Evidence from a social security reform
This paper studies the effects of household income on labor participation and school enrollment of children aged 10 to 14 in Brazil using a social security reform as a source of exogenous variation in household income. We find that increased benefits are associated with increases in school enrollment for girls, as well as a smaller reduction in their labor participation, but find no effects for boys. We also uncover evidence that the gender of the benefit receiver matters for girlsâ labor variables: only benefits received by females reduce girlsâ work.social security reform, child labor, family, school enrollment, old-age benefits, Brazil
Seismic analyses of a R/C building: study of a retrofitting solution
The preliminary experimental results from the tests on a 4-storey R/C frame structure are presented and discussed. The full-scale model is representative of the common practice of 40~50 years ago in most south European countries. Special attention is devoted to the study of a retrofitting solution based on bracing and rubber dissipaters, which intends to increase stiffness and damping reducing consequently the earthquake deformation demands
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