Abstract Archaeological ceramics are considered one of the most important sources both technological and chronological information. Here, investigation some archaeological underwater amphorae from Egadi’s Battle, that decided end First Punic War (241 B.C.), is reported. X-ray Diffraction (XRD), Fluorescence (XRF), petrography, Thermoluminescence (TL) were used to determine composition evaluate ...

This research studies the influence of using SiO2 nano-particles 50nm in a Vapor Compression Refrigeration System (VCRS), along with Poly-alkylene Glycol (PAG) oil and R-134a mixed to create nano-refrigerant. In this work, were performed three different concentrations (0.1%, 0.3%, 0.5%) 200ml PAG oil. AVCR system was built at mechanical engineering department laboratory Al-Qadisiyah University ...

We give examples of CAT(0), biautomatic, free–by–cyclic, one–relator groups which have finite–rank free subgroups of huge (Ackermannian) distortion. This leads to elementary examples of groups whose Dehn functions are similarly extravagant. This behaviour originates in manifestations of Hercules–versus–the–hydra battles in string– rewriting. 2010 Mathematics Subject Classification: 20F65, 20F10...