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Abstract

Shear cracking behaviour of fibrous self-compacting concrete of normal and high strength grade (M30 and M70) is presented here. Two stirrup diameters (6mm Φ and 8 mm Φ) with a constant steel fiber content of 38 kg/m3 (0.5% by volume of concrete) were selected for the present study. The size of the beam was fixed at 100x200x1200mm. The clear span of the beam 1100 mm, was maintained throughout the study. A total of 16 shear-deficient beams were tested under three point loading. Two stirrup spacing (180 mm and 360 mm) are used for the shear span-to-depth ratio (a/d = 2). Investigation indicates that initial cracking load and ultimate load increased as the area of shear reinforcement increased by increasing the diameter of stirrup. It was also noted that the failure mode was modified from brittle shear failure to flexural-shear failure in the presence of fibers. The mechanical behaviour of SFRSCC was improved due to the combined effect of stirrups and steel fibers. The stiffness, toughness, and deflection of the beams increased when compared to SCC beams without fibers. The experimental results were compared with existing models available in literature, and the correlation is satisfactory.

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Authors and Affiliations

Praveen Kannam
Sarella Venkateswara Rao
Rathish Kumar Pancharathi
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Abstract

Various quantile regression approaches are implemented to analyze thecharacteristics of Italian data on earnings in the tails. A changing coefficientspattern across quantiles shows increasing returns to education along the wagedistribution. A quantile decomposition approach shows that higher educationgrants higher return at all quantiles, thus implying additional, non-linear returnsto higher education throughout the entire pattern of the earning distribution.Wage gender gap displays a decreasing pattern across quantiles, and it doesnot disappear at the higher quantiles. The southern workers penalty decreasesacross quantiles as well for highly educated workers.

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Marilena Furno
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Abstract

This paper attempts to define the term, ḥikāyat ḥāl māḍiya, as it is explained by the Qur’ān commentators, who can be considered as the primary source for understanding this term. The term, ḥikāyat ḥāl māḍiya, is not a unique phenomenon of the Arabic language in general or of the Qur’ān in particular. ḥikāyat ḥāl māḍiya, a term typically translated in the research literature as the historical present, is a universal phenomenon used especially in narratives. Before examining the use of the term, ḥikāyat ḥāl māḍiya, in Qur’ānic exegesis, we first provide the Western definition of the term, historical perfect or, as it is also called, historic imperfect, historical present tense or narrative present.1 As will be shown in the first part of the paper, the Western definition is almost identical to the definition of the term, ḥikāyat ḥāl māḍiya, provided by the commentators on the Qur’ān. In both Western and Arabic sources these terms refer to verbs in the present tense used in order to provide a vivid effect and to evoke a past event recounted in a narrative. However, this traditional usage is criticized by Western scholars who propose, based on discourse-analysis, alternative explanations for the tense-switching between the simple past and the historical present. Alternative explanations for verbs in the imperfect which are considered to be cases of ḥikāyat ḥāl māḍiya are also mentioned by the commentators on the Qur’ān and are presented in the second part of this paper.

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Authors and Affiliations

Yehudit Dror

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