نتایج جستجو برای: respectively these variations were resulted by wind erosion control activities over recent years
تعداد نتایج: 9868193 فیلتر نتایج به سال:
in the first part of this thesis we explored wetting and its dynamics for small droplets. first, we showed how a simple feature of water droplets on a surface, i.e. laplace pressure, can be exploited to build a micropump. we investigated capillary pumping in microchannels both experimentally and numerically. putting two droplets of different sizes at the in/outlet of a microchannel, will ge...
The genus Aphanius belong to the family Aphaniidae which is widely distributed in the Mediterranean basin, the Red Sea, the Persian Gulf and brackish and freshwaters of Iran, Pakistan and India. To date, 14 species have been described under the genus Aphanius, in Iran. Currently, due to human-induced disturbance activities (hydrological alteration, introduction of exotic species, over-fishing, ...
Although many different erosion processes affect the coastal area of South Iran, wind caused erosion, considered a restrictive factor in human activities, makes one of the more common landscapes of the coastal strip. Therefore the recognition of wind caused erosion and its result is inevitable to conduct an effective coastal management. This study discusses the littoral geomorphologic shape of ...
The meteorological conditions during the period of spring transition over the Middle East and the Persian Gulf and adjacent land area is investigated. Monthly and seasonal variations of large-scale atmospheric patterns and wind aloft features at different levels were drawn from data collected from the National Centers for Environmental Prediction and National Center for Atmospheric Researches. ...
sand and dust storms are natural events that occur widely around the world, mostly in dry and bare lands. over thepast decade a large part of iran has been affected by this phenomenon, and tehran has not been excluded from thisevent. therefore, having knowledge of spatiotemporal frequency variations can aid us in future management andstorm trajectory assessment. in this study the synoptic anemo...
wind is an important erosive force in deserts, where limited cover of vascular plant material offers little soil-surface protection. erosion and sediment from soil surfaces occurs when wind forces exceed soil threshold friction velocities. soils with physical or biological crusts usually resist wind erosion. this study was conducted by the aim of investigation the effect of trichoderma harzianu...
Introduction: Due to the detrimental consequences of the application of stabilizers such as mulch and other protectives on the soil surface, including the wafting of bad smell, blackening of the ground, increasing thermal coefficient, warming of the whole area, and even destruction of plants and their unsustainability in nature, wide use of such stabilizers could not be considered as a useful s...
Extended abstract 1- Introduction Urmia Lake as the largest domestic lake in Iran is drying. Climate change in the northwest of Iran, rainfall reduction and evaporation, due to the increase in average temperature in the Northwest of the country accompanied with the involvement of human factors such as dam construction, have caused an irreparable environmental hazard in the northwestern of Ira...
Most soils on the Columbia Plateau are derived from windblown sediments deposited over the last 15,000 years, although dust deposition has been ongoing in the region for two million years resulting in loess deposits up to 75 m (250 ft) thick. Many of the soils contain significant amounts of fine particulates and if exposed when dry can produce massive clouds of dust during high wind events that...
the primary goal of the current project was to examine the effect of three different treatments, namely, models with explicit instruction, models with implicit instruction, and models alone on differences between the three groups of subjects in the use of the elements of argument structures in terms of toulmins (2003) model (i.e., claim, data, counterargument claim, counterargument data, rebutt...
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