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91.
Jorge Feijoo Xosé Ramón Nóvoa Teresa Rivas María Jesús Mosquera Javier Taboada Cristina Montojo Fernando Carrera 《Journal of Cultural Heritage》2013,14(5):365-376
We describe the results of electromigration desalination of two soluble salt-contaminated Galician granites. The efficacy of electromigration, which had not been previously applied to granite, was assessed for two types of granite contaminated with a 20% NaCl solution and seawater. Desalination effectiveness was evaluated as follows: (1) analysis of anode and cathode ion content during testing; (2) analysis of ions at different distances from the electrodes after testing; (3) pH assessment of the stone surfaces; and (4) evaluation of colour changes. Results were very satisfactory; by the end of testing, chloride was reduced by almost 100% in both the NaCl and seawater contaminated samples. Sulfate reduction was also significant, despite this ion's lower mobility. The granite pH values remained close to neutral and colour changes were minimal. The difference in effectiveness of the process for the two types of stone was associated with their dissimilar pore structure. 相似文献
92.
Adriana Bernardi Francesca Becherini Marco Verità Patrick Ausset Maura Bellio Ulrike Brinkmann Helene Cachier Anne Chabas Felix Deutsch Marie-Pierre Etcheverry Franco Geotti Bianchini Ricardo H.M. Godoi Velichka Kontozova-Deutsch Roger Lefèvre Tiziana Lombardo Peter Mottner Chiara Nicola Isabelle Pallot-Frossard René Van Grieken 《Journal of Cultural Heritage》2013,14(6):527-536
The methodology of protecting the European stained glass windows against environmental risk (e.g. meteorological factors, air pollution, microorganisms) by means of an external glazing is not new. In spite of many scientific studies carried out in the last 20 years, some questions were still up for discussion. The European VIDRIO (2002–2005) project gave an answer to these questions. The research carried out by the different project partners established a new multidisciplinary approach aimed at evaluating the efficiency of the protective glazing systems and their effects on stained glass windows conservation, and finally at assessing the most appropriate strategy to preserve stained glass windows. Scientific results showed that the so-called isothermal glazing (i.e. ventilation by the air coming from the inside of the building) protected efficiently the ancient stained glass window from environmental attack (i.e. rain, pollutants, condensation, thermal shocks) with very limited secondary effects. The scientific research highlighted that its efficiency was strongly related to the technical design of the protective system. In particular, the ventilation and the size of the interspace had to be carefully considered. The research developed within the VIDRIO project was turned into general recommendations to the owners and practitioners on the best practice for the stained glass windows future conservation. 相似文献
93.
Bernardo Rondelli Sebastian Stride Juan José García-Granero 《Journal of Cultural Heritage》2013,14(3):270-276
In Central Asia, the introduction of mechanised farming and the transformation of the landscape caused by agricultural intensification over the last 50 years have resulted in the massive destruction of archaeological remains. In this paper, we focus on an underestimated and unexploited type of remote sensing for the study of landscape change and anthropic impact on cultural heritage: 1:10,000 Soviet military maps of the 1950s. We present their use in the case study of the Archaeological Map of the Samarkand region. We argue that their precision and the early date at which they were produced make it possible to employ them as a reference tool for systematic survey and archaeological heritage management in Central Asia and throughout the former Soviet Union. We discuss the results of an archaeological survey based on these maps and show how they can be used to evaluate the destruction of archaeological mounds during the last 50 years, by contrasting them with modern satellite imagery. 相似文献
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98.
Arco-Tirado José L. Fernández-Balboa Juan-Miguel 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2003,49(6):585-600
Over the past two decades, the Spanish educational system has undergone various legal reforms. However, judging by the low educational performance of Spanish students as reported by the OECD for the year 2001, it seems that additional reforms are necessary. Several factors may account for the failure of previous reforms to attain the desired results. These include: (a) educators' low expectations that further reforms will succeed, (b) lack of financial resources, (c) institutional lack of commitment to implement the structural and administrative changes called for and (d) the adoption of questionable theoretical models for making appropriate structural, curricular and educational decisions. This essay presents some suggestions for implementing a reform program that would bring about substantial changes in these areas. 相似文献
99.
José BARRIGA 《浙江大学学报(A卷英文版)》2008,9(10):1369-1372
This paper describes a vision-based system for blind spot detection (BSD) in intelligent vehicle applications. A camera is mounted in the lateral mirror of a car with the intention of visually detecting cars that are located in the so-called blind spot and cannot be perceived by the vehicle driver. The detection of cars in the blind spot is carried out using computer vision techniques, based on optical flow and a double-stage data clustering technique for robust vehicle detection. 相似文献
100.
This article presents the results of a single case study from a cooperation school in the Netherlands. A cooperation school is the result of a merger between a public and a denominational school. Pupils from secular and religious backgrounds meet in the classroom. This religious diversity in this school is explored by an empirical research study. The research question was how key values of the school and of its teachers are exerted in religious education. Content analysis of interviews and videos of the ‘moment of contemplation’ show that there is a discrepancy between the school values and the practice of this moment. Conclusions concerning a social and a substantive perspective are drawn in the light of theoretical insight concerning diversity in religious education. 相似文献