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Seismic performance assessment is carried out for reinforced concrete structure built in low-strength concrete lacking confining ties in beam-column joint. Shake-table tests were performed on 1/3rd scaled two-story frame using design-spectrum-compatible accelerogram, scaled to various target levels. The frame is observed with beam longitudinal bar slip and pullout. Joints with no confining ties experienced extensive damage, observed with cover/core concrete spalling. The frame could resist 70% of the design ground motion to remain within the code-specified drift limit. The code requirement for minimum column depth will not avoid joint damageability in case of low-strength concrete and joints lacking confining ties.  相似文献   
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Focusing on children's experience-driven cosmologies revealed through interviews and survey responses, this article seeks to analyse and interpret the way children explain their migration from the USA to Mexico within the context of increases in both voluntary and forced return migration of Mexicans since 2005. It draws from representative samples of students (aged 9–16) enrolled in both public and private schools in several Mexican states, which are complemented by data drawn from in-depth interviews that complicate the sociological typologies about migration, motives for migration, and returnees. The goals of this article are as follows: (a) to illuminate and value children's own narratives about their migration experiences and (b) to discuss the contribution of diverse and apparently contradictory micro-, meso-, and macro-level approaches in studying migrant children.  相似文献   
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The paper consists of six parts. The first part discusses the major reasons for the presence of a conventional sociopolitical Baloch culture in Iran. The second part presents a profile of the Iranian Baloch elites, dividing them into four major groups: the Sunni clerics or molavis, tribal chiefs, the educated, and the wealthy. The third discusses the challenging relationship which exists among the Baloch elites. The fourth describes the elites' attitudes towards the Baloch society's norms. The fifth determines the elites' orientation towards state and politics. And finally the paper ends with conclusions.  相似文献   
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Abstract

Seven cope chests in English churches are described and illustrated. Changes in construction techniques are described, particularly with regard to the use of boards. The chests date to between the twelfth and the fourteenth centuries.  相似文献   
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