نتایج جستجو برای: sahara
تعداد نتایج: 2126 فیلتر نتایج به سال:
During the early to mid-Holocene vegetation expanded cover much of present-day Sahara. Although driven by a well-understood difference in orbital configuration, general circulation models have generally failed simulate required rainfall increase. One possible explanation is presence systematic biases representations atmospheric convection which might also impact future projections. We employ Ba...
Reconstitute community values by promoting a school for everyone was target the Saharawis since first moments of exile and their status as refugees after occupation Western Sahara in 1975. This chapter presents two training plans based on introduction photography its narratives environment education how to give visibility these practices. Data is provided obtained, lived real contexts attending...
Jagung merupakan salah satu komoditas tanaman pangan yang penting di Indonesia. Upaya dapat dilakukan untuk meningkatkan hasil komoditi tersebut dengan melakukan teknik budidaya sesuai diantaranya adalah pemupukan. Tujuan penelitian mengetahui pengaruh penggunaan pupuk NPK phonska dan organik padat (POP) Sahara dosis berbeda terhadap pertumbuhan jagung. Penelitian dilaksanakan Desa Garang Tiga,...
کلزا (.Brassica napus L) یکی از محصولات دانه روغنی مورد توجه کشاورزان در ایران میباشد. شته مومی کلم Brevicoryne brassicae (L.) یکی از آفات مهم کلزا در استان آذربایجانغربی است که خسارت سنگینی به این گیاه وارد می کند. با توجه به اهمیت این آفت مطالعهای در دو قسمت مزرعهای و گلخانهای به منظور ارزیابی تحمل 21 ژنوتیپ کلزا نسبت به شته مومی کلم طی سالهای 1385 تا سال 1387 انجام شد. طی سه سال آزما...
Iron-60 (t1/2= 2.62Myr) is a short-lived nuclide that can help constrain the astrophysical context of Solar System formation and date early Solar System events. A high abundance of Fe(Fe/Fe ≈ 4 × 10) was reported by in situ techniques in some chondrules from the LL3.00 Semarkona meteorite, which was taken as evidence that a supernova exploded in the vicinity of the birthplace of the Sun. Howeve...
Haboobs are dust storms produced by the spreading of evaporatively cooled air from thunderstorms over dusty surfaces and are a major dust uplift process in the Sahara. In this study observations, reanalysis, and a high-resolution simulation using the Weather Research and Forecasting model are used to analyze the multiscale dynamics which produced a long-lived (over 2 days) Saharan mesoscale con...
Every spring a huge number of passerines cross the Sahara Desert and the Mediterranean Sea on their way to their breeding grounds. Stopover sites after such extended barriers where birds can rest, refuel, and find shelter from adverse weather, are of crucial importance for the outcome of their migration. Stopover habitat selection used by migrating birds depends on landscape context, habitat pa...
Deserts are critical environments because they cover 41% of the world’s land surface and are home to 2 billion residents. As highly dynamic biomes desert expansion and contraction is influenced by climate and anthropogenic factors with variability being a key part of the desertification debate across dryland regions. Evaluating a major world desert, the Gobi in East Asia, with high resolution s...
Cattle pastoralism is an important trait of African cultures. Ethnographic studies describe the central role played by domestic cattle within many societies, highlighting its social and ideological value well beyond its mere function as 'walking larder'. Historical depth of this African legacy has been repeatedly assessed in an archaeological perspective, mostly emphasizing a continental vision...
Garden Warblers Sylvia borin were studied during autumn stopover in Crete before crossing the barrier of the Mediterranean Sea and the Sahara Desert. Birds followed with transmitters show extensive stopover periods, which were longer in first-year birds, 16 days, compared with adult birds, 14 days. The distribution of body masses from birds trapped in fig trees were used to estimate the departu...
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