Fiabilidade de estruturas de navios reparados sujeitos a corrosao e fadiga

The objective of this thesis is to develop mathematical tools for the reliability assessment of ship hulls subjected to the degrading effect of corrosion and of fatigue on the longitudinal members. The effect of corrosion is presented as a time dependent process with two states. In the first one, there is no corrosion due to existence of coating protection. Upon failure of the protection system general corrosion decreases plate thickness and affects the midship section modulus. The potential cracks are considered to occur in the connections between longitudinal stiffeners and transverse web frames. The model accounts for the crack growth process applying linear elastic fracture mechanics. It is considered that a ship hull girder is subjected to the simultaneous action of corrosion and of fatigue in longitudinal members. The effect of both phenomena on the section modulus is accounted for and it is used as the reference variable to measure the reliability of the ship hull against collapse. The effect of maintenance actions is modelled as a stochastic process and it is accounted for considering that the repaired elements are restored to a state as new. Different repair policies are studied and the approach can be used as a tool to plan the maintenance action based on reliability resultsAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Periarticular soft tissue chondroma around the knee and shoulder joint – report of 2 cases

Soft tissue chondroma is a rare benign cartilaginous tumor with a typical localization in the hands and feet. The periarticular development of the tumor, combined with its non-specific radiographic manifestation, can lead to serious diagnostic difficulties. We present 2 clinical cases of periarticular soft tissue chondroma, diagnosed and treated in our clinic within the last 2 months

Inter-Municipality Differences – State, Changes, Tendencies

The study analyzes and evaluates the changes and differences in the following concrete directions in the development of the municipalities: financial state, social development, employment and unemployment, ecological state. Comparisons with previous periods are made. Analyzed and evaluated is the process of decentralization of the social services and recommendations for carrying out of policy of decentralization in this field are formulated.