نتایج جستجو برای: dust particles
تعداد نتایج: 193673 فیلتر نتایج به سال:
The circulation of dust suspended in the air is among the most significant environmental problems in the various regions of the world. However, the primary source of the dust present in the atmosphere is fine-grained particles and These tiny particles are more frequent in arid and semi-arid areas. The Tabas Masina Playa in Iran is one of the regions prone to dust production due to warm and dry ...
in this study, selenium was recovered from an industrial dust. after the purification process, the researchers were able to prepare selenium micro powder. the objective of this study was to prepare selenium nano particles by water solution phase method from the micro powders. the results showed that selenium micronized powder and nano particles had high purity. the obtained nanoparticles were t...
the ability of trees to trap dusts convinces their use for preventing the transport of dust over longer distances. this ability is increasingly important in threatened areas with dust invasion. the purpose of this study was to compare the size and distribution of particles deposited on the leaves surface of fraxinus rotundifolia, platanus orientalis, and robinia pseudoacacia trees, in paveh, we...
In this paper, we investigated the effect of dipole-dipole interaction between the dust particles on the transverse oscillation of one dimensional dusty crystal. We used the Boltzmann distribution for the electrons and ions density and assumed that dust particles are negatively charged. The equation of motion for dust particles in this one dimensional chain was obtained. It is shown that the di...
The results of an experimental study of the combustion of aluminum particles in N2/O2 gas mixtures are presented and interpreted. This research focuses on measurement of flame speed and combustion velocity in aluminum particle dust cloud combustion. The dust dispersion technique uses an annular high-speed jet which disperses dust continuously supplied via a piston-type dust feeding system. Pa...
The research results indicated that wet and dry dust deposition is a function of geographical characteristics. The seasonal wet and dry dust deposition and Fine Particles (PM 2.5) correlation in Iran with elevation, latitude and longitude results that the maximum correlation belongs to height, followed by latitude and longitude; meanwhile height and latitude are strongly and reversely correlate...
Natural resources play a fundamental role in the economy of country and create the situation to achieve the goals of sustainable society, these valuable resources have to be conserved and used with care. Destroying the forests and rangelands will lead to a dark future full of poverty, starvation and environmental pollution. Forests and rangelands play a considerable role in reducing air pollut...
To obtain information on formation mechanisms of dust particles of nm in size in fusion devices, in-situ collection of dust particles produced due to interaction between graphite target as plasma facing materials and the plasmas was carried out in a helicon discharge chamber and in Large Helical Device (LHD). Dust particles produced in the helicon discharges are made of carbon and can be classi...
the impacts of dust and sand storms (dss) on people, crops, livestock, infrastructure and health are well documented. data have accumulated on the deleterious effects of dust aerosols when they settle on plants. sand blasting of low growing plants is a common cause of failure in reforestation efforts. burial of plants by moving sands are also a cause of much damage. the physics of moving sand a...
Dust deposition phenomenon is an important climatic and environmental issue in arid and semi-arid regions. The objective of this study was to examine important characteristics of atmospheric dust in Kerman as one of the major cities in arid areas of our country with high potential of dust production. Dust samples were collected monthly using glass traps installed on the roof of 35 one-story bui...
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