منابع مشابه
Gross erosion, net erosion and gross deposition of dust by wind: field data from 17 desert surfaces
Wind erosion measurements were carried out in Nellis Dunes Recreation Area, southern Nevada, USA. Gross erosion (the total mass of sediment effectively blown away from a surface), gross deposition (the total mass of sediment effectively depositing on a surface) and net erosion (the difference in sediment mass before and after an event) were measured for 1 year, on 17 different types of surfaces...
متن کاملClinical study monitoring the pH on tooth surfaces in patients with and without erosion.
The aim of this study was to compare tooth surface pH after drinking orange juice or water in 39 patients with dental erosion and in 17 controls. The following investigations were carried out: measurement of pH values on selected tooth surfaces after ingestion of orange juice followed by ingestion of water (acid clearance), measurement of salivary flow rate and buffering capacity. Compared with...
متن کاملEffect of Erosion on the Hydrogeological Behaviour of Badland Surfaces in Western Canada
Climatic conditions and in situ lithology govern the hydrogeological behaviour of badland surfaces in western Canada. Based on field observations, samples representing three distinct surfaces in the Avonlea badlands (60 km SSW of Regina) of Saskatchewan were collected. The influence of erosion on the engineering properties of this typical indigenous badland profile was investigated by measuring...
متن کاملAcid Erosion
There is a dental epidemic occurring literally right under our noses in this country that is largely unrecognized or mis-diagnosed. It is unparalleled in the history of man because of a combination of present day factors that have never existed before, and it is causing widespread damage to the dental health of millions of Americans. Furthermore, it is relatively simple to recognize and there a...
متن کاملHydraulic erosion
This paper presents a generalized solution to modelling hydraulic erosion using ideas from fluid mechanics. The model is based on the Navier–Stokes equations, which provide the dynamics of velocity and pressure. These equations form the basis for the model to balance erosion and deposition that determine changes in the layers between water and erosion material. The eroded material is captured a...
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ژورنال
عنوان ژورنال: Nature
سال: 1935
ISSN: 0028-0836,1476-4687
DOI: 10.1038/136897a0