نتایج جستجو برای: sand absorbing region
تعداد نتایج: 576229 فیلتر نتایج به سال:
Introduction Sand ramp is a kind of sand dune located on or in the foot of some mountains slopes of arid and semi-arid regions. Although these landforms does not differ from other types of sand dunes in these areas apparently, but, there are significant differences between them from the point of view of slope, sediment grain size, Morphology, sediment homogeneous, stratigraphy, laminatio...
The result of wind dynamic (capacity and potential) is transport of soil or sediment particles and subsequent formative desert landforms based on the severity of erosion or sedimentation. The Khartouran region, because of its geology, geomorphology and climatology conditions is a special place in the arid region on the closed basin of Dasht-e-kavir. It is evident that the ecosystem balance of t...
Background and Objective: Leishmaniasis is one of the most important vector-borne zoonosis that transmits to human by sand fly species. The current study was carried out to identify sand fly species in Zirkooh, Khorasan-e-Jonobi Province. It was also aimed to determine Leishmania species in infected sand flies by RFLP-PCR method. Materials and methods:Sand fly specimens were collected by usi...
The Ab-Barik watershed in Bam is a part of Lut desert basin. It is like all other desert areas which has erosion problems caused by wind erosion, sand and soil storms. The result of these sand storms appears as continuous and isolated sand hills. In this paper it was attempted to identify direction and source of harvest points by using sedimentological methods. This was accomplished by step by ...
BACKGROUND The aim of the study was to evaluate and compare the efficiency and practicality of seven trapping methods for adult phlebotominae sand flies. The results of this investigation provide information to determine the species composition and nocturnal activity pattern of different sand fly species. METHODS The study was carried out in both plain region (about 5km far from northeast) an...
Fine-grained materials of Clayey Loess deposits of Gorgan region were mixed with sand dune in the lab with various rations and their shear behavior was measured and evaluated by direct shear test. The result of the study showed that the increase of fine-grained clay in sand dune was directly related to the adhesion force and inversely to the internal friction angle. The increase or reduction in...
1- Introduction This paper presents a simple method for evaluation of the size distribution of urban of innovative models (base Zipf’s law). The case study is in arid areas (including the province of Yazd). Technically, the arid regions of the world include those located within the tundra belts, commonly referred to as cold deserts, and those located within the equatorial belts of the world, o...
Aberration and retardation of the radiation within a pulsar’s magnetosphere enable a single corotating absorbing region in the outer magnetosphere to give rise to a ‘double notch’ in the pulsar’s observed radio profile. This effect requires that a pulsar has not only absorbing but also emitting regions at heights which are a significant proportion of the light cylinder radius. The known presenc...
We consider the construction of absorbing boundary layers using asymp-totic expansions, the small parameter being the width of the layer. This allows us to deene the order of the layer. We compute layers of various orders and analyse their stability properties. Finally we perform some numerical tests to evaluate the practical utility of our layers. 1. Introduction Classically when one wants to ...
total perceptible water (tpw) is an important parameter in climatology and weather forecasting and is directly related to any climate process. there are three approaches to estimate this parameter i.e. using radiosonde, using gps and calculating from satellite images where the first two are localized and the last one can give an instant view of tpw in a vast region. the algorithm used for the t...
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