The seismicity of the Arabian plate, which is the aim of this paper, is controlled by the ZagrosTaurus collision zone in the North, the Indian expansion zone and the Arab golf in the South and the East, the Dead Sea Fault, the North continuity of the Red Sea, and the Syrian rift, which links the rigid Arabian plate to the mobile ophiolite belt of Cyprus-Southern Turkey in the West. These major elements with their related fracture system, make the Arabian plate an important seismic centre. To attain our purpose, a variable methodology is used in: measurements of movement rate-displacement in the field, the analysis of historical and recent seismic data, and physical effects on the structures. The movement rate-displacement, calculated in the field by different specialists, varies from 2 to 6 mm/year. This rate increases from 2 - 3 mm/year in the North, to 6 mm in the South. These estimations are confirmed by historical seismic data, the recent seismic recorded by the Arab seismic centers, and physical effects on the building structures in the region. The analysis of historical and recent seismic data recorded in the seismic centre show that the seismicity in this plate, tend to fade out with time. This result is in agreement with recent estimations on the movement rate, and in line with the decrease of major seismic intensity, which has occurred during the last millennium. A conclusion of time-evolution seismicity is traced, and a seismic zoning map, for the Arabian plate, using movement rate, seismic data, and tectono-geodynamic analysis, is proposed.
Ancient Arabs have recognized metallic and mineral
ores, including their fluid inclusions which were still considered as a new
scientific fields in the 70’s last century. They discovered metallic ores
(gold, silver, copper), in inhabited areas and in delta and river crosses,
using different techniques for exploration and exploitation. Metallic
industry flourished during the Islamic period, silver and gold were used as
currency for commercial exchanges. Meteorites were also recognized by Ancient
Arabs. They collected them in the deserted areas, and used them for arms manufacturing,
as sabers and daggers. The more famous of these arms is the Damask saber steel,
known reputedly Jaohar. It has an extraordinary mechanical properties, and exceptional sharp cutting
edge. The Jaohar blades were forged directly from fall meteorites, at
temperature of 80℃, using a sophistical thermomechanical of forging,
annealing to refine the steel, and giving it this exceptional quality and
superelastic behavior. Meteorites using by Ancient Arabs come back to 400
years ago, as confirmed by a recent research on two meteorites samples,
presented in Aleppo museum, found in Ras Shamra, and Umm El Maraa, in Syria.
In this paper mathematical techniques have been used for the solution of
Blasius differential equation. The method uses optimized artificial neural
networks approximation with Sequential Quadratic Programming algorithm and
hybrid AST-INP techniques. Numerical treatment of this problem reported in the
literature is based on Shooting and Finite Differences Method, while our mathematical
approach is very simple. Numerical testing showed that solutions obtained by using
the proposed methods are better in accuracy than those reported in literature.
Statistical analysis provided the convergence of the proposed model.