نتایج جستجو برای: falling dust
تعداد نتایج: 61289 فیلتر نتایج به سال:
ABSTRACT Cotton dust is one of the chemical agents that cause air pollution in textile workshops. An investigation was done to measure cotton dust concentration in Mazandaran Province. 37 samples were collected by personal samplers devices and whatman filter papers of worker's inhalation zone of ambient air that contained total dust. 40 samples were collected by whatman filter papers and ho...
introduction atmospheric processes and their interactions with ground surface responsible for formation and evolution of a heavy dust storm are important for identifying dust transport pathways. spatial and temporal distribution of middle eastern dust for a severe dust event during 4-8 july 2009 was analyzed by weather research and forecasting with chemistry (wrf/chem) model simulations, in-sit...
We use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of 250 μm selected galaxies in the local Universe (z < 0.5). As well as simple far-infrared spectral energy distribution (SED) fitting of individual galaxies based on χ2...
1. introduction dust storm is a natural phenomenon that occurs frequently in the arid and semi-arid regions all over the world (alijani, 1997). dust can affect soil fertility, forests, rivers, lakes, and marine ecosystems around the world (mctainsh et al., 2007). therefore, soil erosion can lead to the loss of the minerals and organic matter of topsoil. some elements of dust have also an indire...
introduction atmosphere health is an important environmental issue and air pollution is not a local problem in a given area of the world. particles produced by either humans or the nature enter the atmosphere and return the earth’s surface at local, regional, or global scales after physico-chemical interactions. according to the reports by who, each year 2.4 million people lose their lives worl...
dust can be produced by almost all production processes in portland cement factory. dust exposure potentially can affect respiratory function. but evidence for respiratory effect of cement dust exposure has not been conclusive. in this study we assessed effect of cement dust exposure on respiratory function in a cement production factory. a respiratory symptoms questionnaire was completed and p...
the present study aimed at assessing cement dust exposure and its relationship to lung function at a portland cement factory in ilam, iran. lung function tests were carried out on 112 workers at the cement factory in 2008-09. simultaneously 85 non exposed workers were used as control. lung function tests were performed for all subjects. additionally, total dust level was determined by the gravi...
the aim of this study is to determine the area affected by dust storms in different wind speeds using satelliteimages. in the first step, windy conditions of the sistan plain were analyzed using wind statistics data. next, fivestormy days of zabol city, indicating different wind speeds and horizontal visibilities during those storms, wereselected. then, high temporal resolution modis data was u...
Dust is influenced by the interaction of the atmosphere-Earth system and, by changing radiation energy, atmospheric chemistry and physics, affects the climate of an area. Due to the necessity of the role of dust and its spatial-dynamic distribution in the atmosphere of a region, as well as the existence of advanced remote sensing techniques and modeling in the field of dust simulation, the pres...
different patterns of pressure systems together with local factors, leads in generation, risingand spread of dust in west of iran. in this study, to investigate the factors causing the occurrence of dust inkermanshah province, 132 cases of dust phenomena (code: 06) were selected and analyzed using kermanshahsynoptic station data for the spring and summer seasons in a period of 5 years (2005-200...
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