نتایج جستجو برای: sahara
تعداد نتایج: 2126 فیلتر نتایج به سال:
Hijos de las nubes and 45 Years of Dreams: Saharawi Refugees in Algeria Over the years, issue protracted exile people as a consequence so far unresolved conflict over Western Sahara has become highly politicized problem. The standstill lack clear prospects for referendum that would ultimately end make it questionable Sahrawi refugee situation will change quickly. article attempts to analyse sta...
The carbon isotopic composition of individual plant leaf waxes (a proxy for C(3) vs. C(4) vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C(3) plants (likely trees), indicating substantially wetter conditions than at present. Our data sugg...
Phylogeographical studies are common in boreal and temperate species from the Palaearctic, but scarce in arid-adapted species. We used nuclear and mitochondrial markers to investigate phylogeography and to estimate chronology of colonization events of the trumpeter finch Bucanetes githagineus, an arid-adapted bird. We used 271 samples from 16 populations, most of which were fresh samples but in...
[1] Although evidence is mounting that links global warming to changes in atmospheric dynamics over the Atlantic realm, similar studies over the African continent are lacking. And even if such models would exist, it would be difficult to verify their validity due to the paucity of meteorological observations and anemometers in the central Sahara. A pragmatic way around this problem is to monito...
SCIAMACHY CO2 measurements show a large variability in total column CO2 over the Sahara desert of up to 10%, which is not anticipated from in situ measurements and cannot be explained by results of atmospheric models. Comparisons with colocated aerosol measurements by TOMS and MISR over the Sahara indicate that the seasonal variation of SCIAMACHY-observed CO2 strongly resembles seasonal variati...
The burden of cervical cancer is quite low in the developed countries of the world. The situation is quite the reverse in developing countries where it constitutes a major health problem. While the incidence is decreasing in the former, it is on the increase in the later. This is a source of great concern considering the fact that cervical cancer is preventable and curable at low cost with curr...
شوری یکی از مهمترین تنشهای غیر زیستی است که تولید محصولات کشاورزی را در خاکهای مناطق خشک و نیمه خشک کاهش میدهد. برای بررسی تأثیر شوری بر خصوصیات ریشه، ارقام جو Sahara 3771 (متحمل به شوری) و Clipper (حساس به شوری) در یک آزمایش فاکتوریل در قالب طرح بلوکهای کامل تصادفی با 3 تکرار تحت شرایط عادی و تنش شوری 100 میلیمولار NaCl در کشت هیدروپونیک ارزیابی شدند. تیمار شوری پس از استقرار گیاهچهها و...
The aim of the present study was to investigate the role of sports events tourism on the economic development of the Turkmen Sahara region in Golestan province. The research was a series of exploratory experiments based on the data collected. Data collection tools in the qualitative phase were semi-structured interviews. The statistical sample in the qualitative section includes; 19 tourism man...
Economic geographers are directing increasing attention to international expansion by leading retail TNCs. However, there has been minimal examination of the financing methods of these firms and, while the major retail TNCs have supply relationships in subSahara Africa, so far none have opened stores on the continent. Therefore in this paper we analyse expansion into sub-Sahara Africa by a seco...
One of the motivations for this paper is to enhance our understanding of the interactions that come to bear between some socio-economic development needs and factors generally innate to sub-Sahara Africa that manifest to impede technological adoption in the region. Developing countries, of which all sub-Sahara Africa countries are part, lag in adopting foreign technologies for various reasons, ...
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