There are a number of design procedures which have been developed to determine the appropriate thickness of trackbed layers on a railway track in order to reduce train induced stresses to an acceptable level thus ensu...There are a number of design procedures which have been developed to determine the appropriate thickness of trackbed layers on a railway track in order to reduce train induced stresses to an acceptable level thus ensuring that subgrade failure does not occur prematurely. This paper briefly describes four such procedures and compares the thickness of trackbed layers proposed by each for a number of hypothetical situations. To demonstrate further the suitability of each procedure, two existing sites in the UK are analysed and the trackbed layer thickness given by each procedure is then compared. The research shows that the procedures do not give consistent results. Subsequently it is suggested that it is important to consider other aspects in addition to the prescription of a suitable thickness of trackbed layers in any new build, renewal or remediation scheme.展开更多
The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually b...The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually became a ruin in the middle of the last century. Following the intervention of the monks of this church, a restoration program was set up in 2006. With the agreement of the National Museum in Asmara and the World Monuments Fund, funding was collected together by the German Embassy, the French Embassy, and the Alliance Fran^aise of Asmara, which made it possible to restore the church, between 2006 and 2008. Teams of workmen and women were created to this end. Only traditional techniques were employed for the masonry of the walls, the wooden roofing the plastering, and the interior paintwork. This project, which conforms to the Charter of Venice, could serve as an example for similar restorations in the region and as a model for professional training. Finally, a trilingual article （English, German, and Tigrinya） was published in the Collection ＂Cultures et Patrimoines d＇ErythrGe＂, 2009.展开更多
文摘There are a number of design procedures which have been developed to determine the appropriate thickness of trackbed layers on a railway track in order to reduce train induced stresses to an acceptable level thus ensuring that subgrade failure does not occur prematurely. This paper briefly describes four such procedures and compares the thickness of trackbed layers proposed by each for a number of hypothetical situations. To demonstrate further the suitability of each procedure, two existing sites in the UK are analysed and the trackbed layer thickness given by each procedure is then compared. The research shows that the procedures do not give consistent results. Subsequently it is suggested that it is important to consider other aspects in addition to the prescription of a suitable thickness of trackbed layers in any new build, renewal or remediation scheme.
文摘The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually became a ruin in the middle of the last century. Following the intervention of the monks of this church, a restoration program was set up in 2006. With the agreement of the National Museum in Asmara and the World Monuments Fund, funding was collected together by the German Embassy, the French Embassy, and the Alliance Fran^aise of Asmara, which made it possible to restore the church, between 2006 and 2008. Teams of workmen and women were created to this end. Only traditional techniques were employed for the masonry of the walls, the wooden roofing the plastering, and the interior paintwork. This project, which conforms to the Charter of Venice, could serve as an example for similar restorations in the region and as a model for professional training. Finally, a trilingual article （English, German, and Tigrinya） was published in the Collection ＂Cultures et Patrimoines d＇ErythrGe＂, 2009.
