نتایج جستجو برای: annual variations
تعداد نتایج: 292826 فیلتر نتایج به سال:
background: safety of blood products and plasma derivates is one of main concerns in transfusion sector. screening of donated blood became an emerging item to large extent because of hepatitis c and b virus, (hcv, hbv) and hiv epidemics especially in blood donation campaign following disasters. in this study we aim to evaluate the pattern of variation of viral infection markers donated at three...
This study is aimed at estimating suspended sediment load in watersheds using hydro-climatic factors with the intent to determine spatial and temporal variations of sediment yield in Qarah Su drainage basin, Ardebil Province. For this study, data from seven rain gauge and hydrometric stations during a 22-year period were used. The research was based on statistical regression analysis between va...
[1] We have analyzed thirteen years (1993 to 2005) of HALOE and over two years of EOS MLS observations (September 2004 to December 2006) for QBO and annual cycle trace variations in tropical H2O, HCl, ozone, N2O, CO, HF, and CH4. We use these results to develop the theory explaining both Brewer-Dobson circulation (BDC) and QBO driven fluctuations in tropical trace gases. For H2O, BDC variations...
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