نتایج جستجو برای: depth of erosion

تعداد نتایج: 21173270  

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1393

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...

Journal: Desert 2019
M. Bazgir M. Mirhasani M. Tavakoli N. Rostami,

Wind erosion is considered as one of the main processes of land degradation in different parts of the world. Among the most effective ways to control wind erosion is to cover land surface with natural vegetation area. In this study, 3 replica soil samples were collected, at a depth of 0-3 cm, from various land uses in Dehloran, Ilam Province, Iran. Physical and chemical characteristics of soil ...

Journal: :مرتع و آبخیزداری 0
جلال زندی دانشجوی دکتری آبخیزداری دانشگاه علوم کشاورزی و منابع طبیعی ساری محمود حبیب نژاد روشن استاد گروه آبخیزداری دانشگاه علوم کشاورزی و منابع طبیعی ساری کریم سلیمانی استاد مرکز rs و gis دانشکدة منابع طبیعی ساری

soil erosion is a serious environmental problem in vazroud watershed, which is located in the centre of the mazandaran province, iran. unfortunately, vazroud watershed like most iran watersheds don’t have recorded data and erosion and sedimentation gages to research, monitor and model soil erosion at large watershed. in order to assess the soil erosion risk, soil erosion modeling at the watersh...

Erosion is one of the most destructive and continuous phenomena that cannot be prevented and only could be controlled by studying the chemical and physical properties of soil. Marls are one of the most important sedimentary units in Iran which have high rate in sediment production and erodibility because of their Physico-chemical characteristics. These properties caused large environmental and ...

2003
G. C. Van Kooten

Rates of soil erosion in the dryland cropping region of Saskatchewan are investigated under alternative cropping strategies. Chemical fallow is examined as an alternative to tillage fallow for moisture and soil conservation. Conclusions include: (a) flexible cropping increases net discounted returns and substantially reduces soil erosion compared to the predominant crop rotation; (b) chemical f...

Soil erosion can be considered as one of the most important obstacles in the way of sustainable development of agriculture and natural resources. The aim of this study is to estimate erosion and sediment yield of basin using Erosion Potential Method, in Gorganrud basin, north of Iran. The main factors in the EPM (slope average percent, erosion, rock and soil resistance, and land-use) were evalu...

2010
Ryan L. Perroy Bodo Bookhagen Gregory P. Asner Oliver A. Chadwick

a r t i c l e i n f o Gully erosion removes comparatively large volumes of soil from small areas. It is often difficult to quantify the loss of soil because the footprint of individual gullies is too small to be captured by most generally available digital elevation models (DEMs), such as the USGS National Elevation Dataset. Airborne LiDAR (Light Detection and Ranging) has the potential to prov...

Journal: :International journal of environmental research and public health 2016
Yujin Li Juying Jiao Zhijie Wang Binting Cao Yanhong Wei Shu Hu

BACKGROUND The Loess Plateau, an ecologically vulnerable region, has long been suffering from serious soil erosion. Revegetation has been implemented to control soil erosion and improve ecosystems in the Loess Plateau region through a series of ecological recovery programs. However, the increasing atmospheric CO₂ as a result of human intervention is affecting the climate by global warming, resu...

Extended abstract Introduction Water erosion has been a problem worldwide, which causes the phenomenon of land degradation in semi-humid areas of dry land. The risk of soil erosion in arid and semiarid areas, especially in mountain ranges is of significant cases in land use planning. Soil erosion in these areas is one of the important consequences of climate change, or in general, the ob...

ژورنال: علوم آب و خاک 2015
بهاری, مرضیه , شاه‌نظری, علی ,

Transporting borrow materials for proper infrastructure of water channels to bear the load of such structures is important in the development plans. Therefore, in this research clay nanocomposite material with a weight ratio of %1 was added to the soil. Soil sample was taken from the bed of the C25 canal (distributary of GanjAfrooz diversion dam within Alborz project area) at various intervals ...

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