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Sandro Calogero Mariangela Bertelle Fabrizio Antonelli Lorenzo Lazzarini 《Journal of Cultural Heritage》2000,1(4):429
57Fe Mössbauer spectroscopy permits an explanation of the formation of the iron-bearing species present in three types of coloured marbles, known as cipollino mandolato, rosso antico and fior di pesco. Structural Fe2+ and Fe3+ located in silicates, together with the remains of weakly ferromagnetic hematite, arise from primary sediments. Fe2+ located in carbonates and anti-ferromagnetic hematite are formed by redox processes during marble formation. The relative contents of the iron species in the three types of marbles depend on the composition of the primary sediments and on local conditions during metamorphism. Knowledge of the type and amount of the iron species in marbles may help in the reconstruction of the redox processes, which took place during marble formation. The deviations of the Morin transition of the hematites play the role of genetic indicator because purity, crystallinity and the red hues of hematites in marbles can be related to the environment of formation. 相似文献
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Lorenzo Garcia 《Multicultural Perspectives》2013,15(2):20-24
In this study, I examine the perspectives of preservice teachers enrolled in a multicultural education course at a large predominately White Midwestern university. Past research on the development of multicultural attitudes and knowledge of White preservice teachers is inconclusive. In an effort to examine the multicultural perspectives of preservice teachers, 13 prospective teachers enrolled in required semester-long multicultural education courses were regularly interviewed and observed. Results of the study indicate that preservice teacher perspectives toward diversity were influenced by their social and educational histories; popular culture, such as the news media and movies; and the traditional structure of the teacher education program. The single course had minimal impact on their perspectives. Recommendations include infusing a multicultural perspective throughout the teacher education program and the development of collaborations between the program and culturally diverse schools. 相似文献
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Lledó Gonzalo Lorenzo Lledó Asunción Gilabert-Cerdá Alba Lorenzo-Lledó Alejandro 《Education and Information Technologies》2022,27(4):4865-4885
Education and Information Technologies - In today's society, technology plays a fundamental role. More and more activities of daily life are being developed with the help of technology. One of... 相似文献