يعرض 1,061 - 1,080 نتائج من 1,791 نتيجة بحث عن '(( 10 ((meters decrease) OR (((nn decrease) OR (a decrease)))) ) OR ( 10 i decrease ))*', وقت الاستعلام: 0.15s تنقيح النتائج
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    Towards understanding the effects of climatic and environmental factors on solar PV performance in arid desert regions (Qatar) for various PV technologies حسب Touati F.

    منشور في 2012
    "…It was estimated that 100 days of dust accumulation over mono-crystalline PV panels, caused the efficiency to decrease by around 10%. This limitation makes solar PV an unreliable source of power for unattended or remote devices and thus strongly suggests the challenge of cleaning the panel's surface regularly or injecting technical modifications. …"
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  8. 1068

    Experimental studies on the biodiesel production parameters optimization of sunflower and soybean oil mixture and DI engine combustion, performance, and emission analysis fueled wi... حسب Elkelawy M.

    منشور في 2019
    "…70% biodiesel) were prepared to power a single cylinder diesel engine. The engine results as compared to diesel fuel, show a reduction in the rate of change of CO by 33.8% for D50B50. …"
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  20. 1080

    Conversion of Organic Municipal Wastes into Biochars and their Effect on Fertility Parameters of Normal and Sabkha Soils of Qatar حسب Ahmedna, Mohamed

    منشور في 2016
    "…To each pot, sufficient amount of 0.25-mm sieved biochar was mixed with soil to yield carbon to soil ratios of 0, 1, and 2% (wt/wt). Box-Behnken experimental design was used instead of the full factorial to decrease the number of treatments to a manageable level (126 treatments) with three replications at the center. …"
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