نتایج جستجو برای: depth of erosion
تعداد نتایج: 21173270 فیلتر نتایج به سال:
This study aimed at assessing the susceptibility of different tooth types (molar/premolar), surfaces (buccal/lingual) and enamel depths (100, 200, 400 and 600 μm) to initial erosion measured by surface microhardness loss (ΔSMH) and calcium (Ca) release. Twenty molars and 20 premolars were divided into experimental and control groups, cut into lingual/ buccal halves, and ground/polished, removin...
This paper focuses on constraining the erosion rate in the area of the Allchar Sb-As-Tl-Au deposit (Macedonia). It contains the largest known reserves of lorandite (TlAsS2), which is essential for the LORanditeEXperiment (LOREX), aimed at determining the long-term solar neutrino flux. Because the erosion history of the Allchar area is crucial for the success of LOREX, we applied terrestrial in ...
Soil erodibility and gully erosion and their expansion occur under geological formation and soil characteristics. This study aims to find the rate of soil and formation effects on gully erosion in Seifabad watershed. To that end, aerial and field work were used together to determine the rate & expansion of 17 gullies in 12 years' period from 1997 to 2009. The soils were sampled for each gully ...
hairsine and rose (1991) developed a process-based soil erosion model which described the erosion transport of multiparticle sizes in sediment for rain-impacted flow in the absence of entrainment in overland flow. in order to test this model laboratory experiments were carried out in a detachment tray using simulated rainfall. three contrasting soil types were subjected to simulated rainfall at...
this ethnographic case study research was carried out in a private school setting in the context of iran. the research tried to explore the analysis and identity construction of a group of learners and teachers along with the content analysis of books on the basis of four types of commodified, political, national and narrative identities. how english language learners and teachers in an informa...
Tamarix sricta plant grows in riversides of Karun river. Outer body plant in the flood times causes decrease in water velocity, preventing erosion. One of the factors by which the hydraulic resistance is expressed is the roughness coefficient. Measurement of roughness coefficient of the existing plants in these riversides and floodplains, and surveying their effects on the velocity decrease and...
Abstract Gypsum and gypsum mortar are among the most sophisticated and unique traditional building materials of Iran that over the past two thousand years, by varying the strength properties as well as the gypsum mortar retention time, gypsum plaster artists have created diverse works with different techniques as architectural arrays, sometimes by decreasing or increasing the ratio of the wa...
This memorandum examines the effect of the erosion strain parameter on the numerical simulation results of the penetration of two different projectile/target systems. This parameter permits the failure of the material and numerically allows the penetration of the target. The first system examined consists of the SS109 5.56-mm bullet striking a 10.8-mm 6061-T6 aluminium target while the second s...
The paper discusses the material removal process in refractory ceramics eroded by hydro-abrasive jets. In particular, bauxite, sintered magnesia, and magnesia chromite are eroded. The influence of abrasive particle velocity, local exposure time, abrasive mass-flow rate, and abrasive type is investigated. Erosion depth, specific erosion rate, and geometry of the generated cavities are measured a...
Soil erosion is a form of land degradation. It the process moving surface soil with action external forces such as wind or water. Tillage also causes erosion. As outlined by United Nations Sustainable Development Goal (UN SDG) #15, it global challenge to “combat desertification, and halt reverse degradation biodiversity loss.” In order advance this goal, we studied modeled depth typical watersh...
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