نتایج جستجو برای: erosion)
تعداد نتایج: 30410 فیلتر نتایج به سال:
چکیده مقدمه: اختلالات مفصل گیجگاهی-فکی(tmd) به طور کلاسیک توسط گروهی از علایم کلینیکی شامل درد و صداهای مفصلی و محدودیت یا انحراف هنگام باز کردن دهان مشخص می شوند. هدف از این مطالعه بررسی ارتباط یافته های کلینیکی با تغییرات استخوانی در تصاویر cbct بیماران مبتلا به اختلالات مفصل گیجگاهی فکی (tmd)می باشد. مواد و روش کار: از میان مراجعه کنندگان به بخش پروتز دانشکده دندان پزشکی مشهد ، تعداد 41 ب...
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The Three Gorges Reservoir Area is one of the most severe soil erosion in China. Serious erosion has degraded the soil productivity, deteriorated the ecological environment, and influenced the service life of Three Gorges Reservoir. The natural and social-economic factors which influence the soil erosion in Three Gorges Reservoir Area include topography, geological situation, vegetation, rainfa...
Potter, K. N., Williams, J. R., Larney, F. J. and Bullock, M. S. 1998. Evaluation of EPIC’s wind erosion submodel using data from southern Alberta. Can. J. Soil Sci. 78: 485–492. Wind erosion models have been used to assess policy impacts on soil erosion, but validation of models has been difficult until recently. We evaluated the Environmental Policy Integrated Climate (EPIC) wind erosion subm...
The black soil region of Northeast China has suffered from severe soil erosion by water. Hillslope and gully erosion are the main erosion types. The objective of this research was to integrate the assessment of hillslope and gully erosion and explore spatial coupling relations between them in the Mushi River sub-catchment using geographical conditions monitoring (GCM) including remote sensing (...
Currently gravity irrigation remains the most widely used in agricultural areas and 90 percent of plantings, the water is applied to the plots by gravity. One of the main problems with these systems is erosion, which is a by product of the erosive forces of water over the row, which brings soil loss and therefore decreases in crop yield. Erosion is the removal of surface soil material caused by...
Erosion in the first year after a wildfire can be up to three orders of magnitude greater than the erosion from undisturbed forests. To mitigate potential postfire erosion, various erosion control treatments are applied on highly erodible areas with downstream resources in need of protection. Because postfire erosion rates generally decline by an order of magnitude for each year of recovery, ef...
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