The Convex Configurations of "Sei Shonagon Chie no Ita" and Other Dissection Puzzles

The Convex Configurations of "Sei Shonagon Chie no Ita, " Tangram, and Other Silhouette Puzzles with Seven Pieces

Convex Configurations on Nana-kin-san Puzzle

We investigate a silhouette puzzle that is recently developed based on the golden ratio. Traditional silhouette puzzles are based on a simple tile. For example, the tangram is based on isosceles right triangles; that is, each of seven pieces is formed by gluing some identical isosceles right triangles. Using the property, we can analyze it by hand, that is, without computer. On the other hand, ...

Intrathecal Analgesia Versus Non-analgesia in Labor on Maternal and Neonatal Outcomes

Aims: Spinal analgesia is the most common method that provides pain relief during labor and controversy exists about its effect on the maternal and fetal among the women. This study was conducted to determine the effect of intrathecal analgesia (ITA) on perineal laceration, duration of the first, second, and third stage of labor, and Apgar score. Materials & Methods: Fifty primipara parturien...

Hinged Dissection of Polygons is Hard

We show several natural questions about hinged dissections of polygons to be PSPACE-hard. The most basic of these is: Given a hinged set of pieces and two configurations for them, can we swing the pieces on the hinges to transform one configuration to the other? We also consider variants in which the configurations must be convex, the placement of hinges is not specified, or the configurations ...

Comparative Analysis of Phenolic Composition and Antioxidant Effect of Seed Coat Extracts of Four Cowpea (Vigna unguiculata) Varieties on Broiler Meat

Seed coat crude extracts of white-coloured ITA-256, white and brown-coloured TVS-716, deep brown-coloured IT-90K and light brown-coloured Ife brown cowpea varieties were analyzed for the presence and amount of total phenol, tannin and flavonoid content. Crude extracts of the cowpea varieties were analyzed for antioxidant activity using the Thiobarbituric Acid (TBA) assay. The seed coat extracts...