Six months of DAPT was not inferior to 18 months of DAPT following implantation of a DES with a biodegradable abluminal coating. However, this result needs to be interpreted with caution given the open-label design and wide noninferiority margin of the present study. (Nobori Dual Antiplatelet Therapy as Appropriate Duration [NIPPON]; NCT01514227).

The performance of a prototype pump converted from that of its model pump shows an increase in efficiency brought about by a decrease in friction loss. As the friction force working on impeller blades causes partial peripheral motion on the outlet flow from the impeller, the increase in the prototype's efficiency causes also a decrease in its input power. This paper discusses results of analyses on the behavior of the theoretical head or input power of a prototype pump. The equation of friction-drag coefficient for a flat plate was applied for the analysis of hydraulic loss in impeller blade passages. It was revealed that the friction-drag of a flat plate could be, to a certain degree, substituted for the friction drag of impeller blades, i.e. as a means for analyzing the relationship between a prototype pump's efficiency increase and input power decrease.

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The use of the Rehbock formula for measuring flow rates with full-width sharp-crested weirs, specified in ISO 1438, is restricted to weirs with a weir plate height of less than 1 m. Previous studies have shown that deviations in measured discharge coefficient from the Rehbock coefficient increase with increasing weir height at heights of over 1 m, owing to the scale effect of weir height. In this paper, a new discharge coefficient is proposed for use when applying the Rehbock formula to weir plate heights over 1 m, as discharge flow rates of large-size pumps are usually measured using full-width weirs with a plate height as high as 2 m. Its validity is examined and verified, based on test results in studies by Schoder-Turner and later researchers. The paper also discusses the effect of scale on discharge coefficient in relation to the boundary layer on the weir plate.

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