Ultrafine-grained Cu/Al/Ag composites were processed by an accumulative roll bonding (ARB) technique from pure copper and aluminum sheets a silver powder. The Al content was fixed to 11 wt.% while the concentration 1, 2, or 3 in wt.%. ARB-processed samples heat treated at different temperatures between 750 1050 °C for 60 min then quenched room temperature (RT) producing Cu–Al–Ag alloys. effect ...

Accumulative roll bonding is an advanced manufacturing process, which capable of simultaneously refining the grain size into nanometer regime and different metallic sheet materials. Herein, homogenous aluminum/aluminum as well heterogeneous aluminum/steel laminated metal composite (LMCs) are fabricated. The residual stresses experimentally determined by X-ray diffraction hole-drilling method. G...

The final hot strip profile is a superposition of the roll initial crown, the roll bending and flattening crown, the roll wearing crown and the roll thermal crown. In this research, linear regression models are proposed to predict the roll force, the roll wearing crown and the roll thermal crown using experimental data provided by Mobarake Steel Complex (MSC). The short beam theory based on ela...

The study of the archaeological remains of fossil hominins must rely on reconstructions to elucidate the behaviour that may have resulted in particular stone tools and their accumulation. Comparatively, stone tool use among living primates has illuminated behaviours that are also amenable to archaeological examination, permitting direct observations of the behaviour leading to artefacts and the...

Spectrum handover is a significant topic in the cognitive radio networks to assure an efficient data transmission in the cognitive radio user’s communications. This paper proposes a comparison between three spectrum handover models: VIKOR, SAW and MEW. Four evaluation metrics are used. These metrics are, accumulative average of failed handover, accumulative average of handover performed, accumu...

This article proposes a hybrid algorithm for spectrum allocation in cognitive radio networks based on the algorithms Analytical Hierarchical Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to improve the performance of the spectrum mobility of secondary users in cognitive radio networks. To calculate the level of performance of the proposed algorithm...