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Most contemporary database systems query optimizers exploit System-R’s dynamic programming method (DP) to find the optimal query execution plan (QEP) without evaluating redundant sub-plans. However, in the relational database setting today, large queries containing many joins are becoming increasingly common. Based on this trend, it has become temping to improve the DP performance. Chip Multi-P...
For land-breeding marine organisms such as seabirds, knowledge about their habitat use has mainly been gained through studies of breeding individuals that are constrained to return frequently to their breeding grounds. In this study we set out to measure whether: a) habitat selection in the non-breeding period predicts habitat selection in the breeding period, and b) whether breeding individual...
Meteorological parameters play a significant role in affecting ambient air quality of an urban environment. As Dhaka, the capital city of Bangladesh, is one of the air pollution hotspot among the megacities in the world, however the potential meteorological influences on criteria air pollutants for this megacity are remained less studied. The objectives of this research were to examine the rela...
This article examines the relationship between return, systematic risk, skewness and kurtosis in Tehran stock exchange during 2002-2006. Similar research, in this field, shows different results on upward and downward markets, therefore the period under study is divided into sub periods including upward market (2002-2004) and downward market (2004-2006) and the relationship between these sub per...
The genus Cladosporium is restricted to dematiaceous hyphomycetes with a coronate scar type, and Davidiella teleomorphs. In the present study numerous cladosporium-like taxa are treated, and allocated to different genera based on their morphology and DNA phylogeny derived from the LSU nrRNA gene. Several species are introduced in new genera such as Hyalodendriella, Ochrocladosporium, Rachiclado...
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