Quasilinear eigenvalues

In this work, we review and extend some well known results for the eigenvalues of the Dirichlet $p-$Laplace operator to a more general class of monotone quasilinear elliptic operators. As an application we obtain some homogenization results for nonlinear eigenvalues.Comment: 23 pages, Rev. UMA, to appea

Probabilistic Analysis of the Active Earth Pressure on Earth Retaining Walls for c‑φ Soils According to the Mazindrani and Ganjali Method

The determination of the earth pressure coefficients (K) in geotechnical engineering is one of the most critical procedures in designing earth retaining walls. However, most earth pressure theories are made for either clay or sands, where the c-ϕ soils are the least analysed. In this paper, an analysis of the earth pressure for drained mixed soils based in Mazindrani and Ganjali (J Geotech Geoenviron Eng 123:110–112, 1997) theory was carried out. Earth pressure coefficients are generally used in a deterministic way and can represent designs under an inadmissible risk. Therefore, Reliability-based design arises as an essential tool to deal with soil variability as one of the main aspects of the geotechnical uncertainties. The influence of the soil variability in the active earth pressure for a c-ϕ soil was performed through probabilistic analysis concerning the Ka coefficient of variation (Cv) of both shear strength parameters. The sensitivity analysis shows a Cv in which the cohesion begins to have a more significant correlation with Ka than the friction angle. The results show an increase of the statistical Ka concerning the deterministic value as the soil variability and the soil slope (β) increase. Although the statistical value does not increase significantly, a statistical analysis on gravity walls and sheet pile walls in c-ϕ soils shows a significant probability of failure (pf) increase. The pf obtained through the c-ϕ variability can be considered inadmissible even if the required FS are met

La administración pública en los estados y reflexiones sobre el federalismo

El federalismo en México, desde su concepción orig i nal en la Constitución de 1824, ha venido transformándose y adecuándose a las nuevas exigencias de estados y municipios para pasar de una centralización a una descentralización, con la finalidad de transferir más facultades y atribuciones del gobierno cen tral hacia otros órdenes gubernamentales. A la par, han surgido organizaciones como la Conferencia Nacional de Gobernadores (Conago) para el caso de los estados, y asociaciones como la Conferencia Nacional de Municipios de México (Conamm) para los municipios, como un contrapeso real para el fortalecimiento del federalismo. A continuación analizaremos algunos aspectos de la descentralización que están contribuyendo a dicho fortalecimiento en México

Crustacean fisheries

Proceedings of the Conference on Life History Assessment and Management of Crustaceans, La Coruna, Galicia, Spain, 8–11 October 200