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This paper is the second of the two papers, discussing the rocking and resultant component of rotations, with the torsional components of motions presented earlier in the first paper for the case of out-of-plane SH waves excitation on a semi-parabolic canyon. The rotational motions are gaining importance in recent years in the field of strong-motion seismology and earthquake engineering. Many previous papers on out-of-plane SH waves excitation presented the associated torsion rotational motions, when in fact there is also a rocking rotational component of motions. Both the rocking and torsion rotational motions, in as much as the translational motions, had shown to play an important role in structural responses, even though rotations are not incorporated into building design codes at present. Studying the rotational motions can thus help to a better understanding of the behavior of surface topographies that are in the vicinity of structures in the event of seismic excitation. This paper included, besides the additional rocking motions, also the resultant rotational motions combining torsion and rocking. 相似文献
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The oldest pearl in the world was found in the United Arab Emirates and dates from 7500 BP. Gemmologists and jewellers have popularised the idea that the oldest pearl in the world is the 5000‐year‐old Jomon pearl from Japan. Discoveries made on the shores of south‐eastern Arabia show this to be untrue, as the archaeological pearls that have been found are 2500 years older. In this region, pearls still hold an important place. Indeed, today they remain a central, identifying element. The discovery of archaeological pearls demonstrates an ancient fishing tradition that no longer exists today. 相似文献
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Caroline Gallez Vincent Kaufmann Hanja Maksim Mariane Thebért Christophe Guerrinha 《European Planning Studies》2013,21(8):1235-1255
In Europe, the idea that coordinating transportation and urban planning is a necessary condition for setting sustainable urban development into motion has spread throughout academic and professional circles. While this concern is not new, the objectives underlying transport and urban planning coordination have deeply changed over the last decades. How have local authorities translated the requirements and objectives of national laws? How have they accounted for the evolution of these global objectives? What factors explain innovation and continuity in the relationship between land use planning and transport policies? In a comparative research between Switzerland and France, we addressed the question of political change by reconstituting the “trajectories” of four urban areas: Geneva and Bern in Switzerland and Strasbourg and Bordeaux in France. We have described the policy paths of these urban areas since the end of the 1960s by focusing on the contents of master plans, the principal technical solutions and projects that have been implemented, and the means of inter-sectorial coordination used. For each case, factors of change or inertia have been identified by focusing on three main variables that are often studied alternatively in public policy analysis: ideas, institutions and interests. 相似文献