Combining the Ranked Output from

This paper demonstrates the advantage of combining a ranked output from a fulltext index and another from an index generated using generic summary texts. Our main findings are as follows: (1) The combination of a fulltext-based run and a summary-based run can significantly outperform either alone, especially when the fulltext evidence is emphasized. (2) The primary role of the summary index in the above combination is to promote some of the relevant documents already retrieved by the fulltext index, rather than to discover new relevant documents. (3) Moreover, though the summary quality can make a difference for this combination approach, even simple extracts such as 5% "lead" may give significant improvements

Hypoeutectic Al-Si Alloy Doped with Chromium, Tungsten and Molybdenum Designated for Pressure Die Casting

Structural modification of hypoeutectic Al-Si alloy EN-AC 46000 alloy influences its microstructure and mechanical properties. In a series of examinations the EN-AC 46000 alloy has been doped with Cr, W and Mo. The study involved the differential thermal analysis (DTA) and the light microscopy structural analysis of the samples cut from pressure die castings and from samples cast into the DTA cup. The DTA and microstructure analyses revealed new phases in the alloy doped with mentioned additives. The strength properties measurements of the alloys doped with Cr, W and Mo showed significant improvement in tensile strength and elongation, while preserving good hardness