Deflection hardening of sustainable fiber–cement composites

In the present study sisal fiber–cement composites reinforced with 4% and 6% of short fibers were developed and their physical–mechanical behavior was characterized. To ensure the composite sustainability and durability, the ordinary Portland cement matrix was modified by adding fly ash and metakaolin, and the natural aggregate was substituted by 10% and 20% of recycled concrete aggregate. Flat sheets were cast in a self-compacted cement matrix and bending tests were performed to determine the first crack, postpeak strength and toughness of the composites. Cyclic flexural tests were carried out to determine the stiffness variation of composite due to cracking formation and propagation. It can be seen that the reinforcement provided by short sisal fibers for recycled cement matrices guaranteed a composite with multiple cracking and an increase of strength after the first crack. Reduction of stiffness and increase the damping capacity of composite are verified with progressive cracking.CAPES (PVE Program: Project 047/2012) and CNPqBrazilian agency FAPESBBrazilian agency CAPES through the PVE Progra

Influência das configurações organizacionais sobre valores no trabalho e preferências por recompensa

O artigo tem como objetivo identificar as similaridades e diferenças nos valores relacionados ao trabalho e preferências por recompensa entre diferentes configurações organizacionais, especificamente organizações privadas, públicas e de contextos mistos ou híbridos. Tendo como base pesquisa realizada no Brasil por Tamayo e Gondim (1996) sobre os valores e nos Estados Unidos por Wittmer (1991) sobre preferências por recompensa, as variáveis de interesse relacionaram-se a quatro categorias de valores associados ao trabalho: i) eficácia/eficiência, ii) sistema de gestão organizacional, iii) respeito ao empregado e iv) preferências por recompensa. O procedimento analítico adotado foi o da comparação das distribuições para os grupos, em cada categoria de análise, usando a análise da variância e confirmação pelo teste não paramétrico de Kruskal-Wallis. Foram encontradas diferenças significativas no nível de 5% apenas para dois itens relacionados à categoria sistema de gestão organizacional (respeito aos níveis de autoridade e à hierarquia, e cumprimento das tarefas dentro dos padrões da organização) para as respostas dos três grupos. Em relação à categoria preferências por recompensa, os resultados contrariam aqueles obtidos por Wittmer (1991) no contexto americano

O Museu do Estado da Bahia, entre ideais e realidades (1918 a 1959)

This article retraces the trajectory of the Museu do Estado da Bahia from 1918 to 1959. The aim is to identify its successive museological practices and the implementation of the so-called processes of musealization during its institutionalization and consolidation, which were also related to the personalities of the administrators and their expectations regarding political and social interactions, as well their expectations toward the State of Bahia itself. Having dealt with a wide range of conflicts, alterations have been observed in how the museum functions. Within the framework in question, three successive periods have been characterized: its establishment as a historic museum; its consolidation as an eclectic museum with a focus on history, and the path towards art under the direction of José Valladares

Characterisation of microbial attack on archaeological bone

As part of an EU funded project to investigate the factors influencing bone preservation in the archaeological record, more than 250 bones from 41 archaeological sites in five countries spanning four climatic regions were studied for diagenetic alteration. Sites were selected to cover a range of environmental conditions and archaeological contexts. Microscopic and physical (mercury intrusion porosimetry) analyses of these bones revealed that the majority (68%) had suffered microbial attack. Furthermore, significant differences were found between animal and human bone in both the state of preservation and the type of microbial attack present. These differences in preservation might result from differences in early taphonomy of the bones. © 2003 Elsevier Science Ltd. All rights reserved