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J. Cassar M. Galea R. Grima K. Stroud A. Torpiano 《Environmental Earth Sciences》2011,63(7-8):1849-1860
The Maltese Megalithic Temples, constructed between the mid-fourth and mid-third millennia BC, are unique and are amongst the oldest stone buildings of such complexity in the world. They are of great local and international significance, embodying symbolic, educational and recreational values. These Temples are currently suffering from a series of severe problems associated with the deterioration of materials as well as structural problems, seen in a number of serious collapses in recent years. In 2000, it was decided that these vulnerable prehistoric structures needed to be protected from the direct impact of environmental factors by means of a temporary, open-sided shelter, conceived as a large parasol designed to be as light as possible, in visual as well as in physical terms. The erection of two of these shelters took place during 2008–2009. The performance of the shelters is currently being assessed by environmental monitoring which already indicates an improvement in conditions beneath the shelters when compared to conditions on site before sheltering. 相似文献
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Natural Hazards - It is known that local geology can alter the ground motion characteristics at a particular site. Whereas some sites are characterised by outcropping low-velocity layers, others... 相似文献
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In this paper, the lowest order small-slope approximation (SSA) scattering cross section for Biot theory is derived. Numerical results are obtained for both backscattering and bistatic scattering using a modified power law spectrum, and these results are compared with those of lowest order perturbation theory (PT). Frequencies ranging from 100 Hz to 3 kHz are used for surfaces with RMS heights h of 0.1 and 1 m and a correlation length l of 10 m. The angle of incidence for the bistatic results is limited to 45/spl deg/. It is found that for the smaller surface height roughness (h = 0.1 m), the SSA and PT give the same results for frequencies up to almost 1 kHz for both backscattering and bistatic scattering. For h = 1 m, the SSA and PT backscatter results are in good agreement at all frequencies for incident grazing angles up to approximately 45/spl deg/. For the bistatic results, the SSA and PT results agree only at low grazing angles of scatter. In the specular region, the results differ significantly. 相似文献
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Maltese symbolic and lived identities are examined to explore the changes that occur in cultural identity between generations and place of residence within metropolitan Sydney. The results are employed to problematise Sandberg's straight-line theory, that is, that ethnic identity will decline with each successive generation. Our results, exploring ethnic identity in both its symbolic and lived-experience forms, confirm arguments that global cities are not homogeneous territories, as implied by Sandberg, but rather sites of cultural difference. The results suggest that, regardless of place of residence or generation, the symbolic Maltese identities remain similar, combating the old, naive assimilationist assumption that all immigrants would quickly abandon their ethnic identity, and favouring arguments supporting hybrid identities. Similarly, results for Maltese identity as lived experience suggest that their Maltese identity is less important only for those second-generation Maltese living in census collection districts with less than 10 per cent of the population born in Malta. 相似文献
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