The overall total population of the Arab nations in the world is estimated to be approximately 315 million (estimates; World Almanac, 2004). Arab populations encompass a vast geographical region that extends from Iraq in the east to Morocco in the west. They occupy the whole of Mesopotamia, Middle East, Arabian Gulf, North Africa, as well as some parts of East and West Africa. Arab populations ...

The genus Exaesiopus Reichardt, 1926 is revised herein. It now contains seven species; one new combination is proposed: Pachylopusglaucus = Exaesiopusglaucus (Bickhardt, 1914), comb. n., and one species is described as new: Exaesiopustherondi sp. n. from Afghanistan. Subspecies Exaesiopusgrossipesberberus Peyerimhoff, 1936 is sunk in synonymy with Exaesiopusgrossipes (Marseul, 1855), syn. n. Le...

In this experiment, we derive and compare radar stereo and interferometric elevation models (DEMs) of a study site in Djibouti, East Africa. As test data, we use a Radarsat stereo pair and ERS-2 and Radarsat interferometric data. Comparison of the reconstructed DEMs with a SPOT reference DEM shows that in regions of high coherence the DEMs produced by interferometry are of much better quality t...

Drought is a meteorological and hydrological phenomenon affecting the environment, agriculture, socioeconomic conditions, especially in arid semi-arid regions. A better understanding of drought characteristics over short long timescales therefore crucial for mitigation long-term strategies. For first time, this study evaluates occurrence, duration, intensity Republic Djibouti by using (1961–202...