نتایج جستجو برای: dust particles

تعداد نتایج: 193673  

Journal: :جغرافیا و مخاطرات محیطی 0
فهیمه محمدی سمیه کمالی مریم اسکندری

1. introduction dust phenomenon which occurs in arid and semiarid lands of the world is closely related to climatic characteristics of the region. according to the world meteorological organization (wmo), whenever wind speed exceeds 15 meter per second and horizontal visibility reduces to less than 1 km in a station, dust storm is reported (goudie & mideleton, 2006). great storms are created wh...

2012
Nobuyasu Yamaguchi Tomoaki Ichijo Akiko Sakotani Takashi Baba Masao Nasu

The atmospheric dispersion of bacteria over long distances is an important facet of microbial ecology. Certain groups of dispersed bacteria can adapt to their new location and affect established ecosystems. Aeolian dust particles are known to be carriers of microbes but further research is needed to expand our understanding of this field of microbiology. Here we showed the potential of aeolian ...

2015
Masanari Watanabe Hisashi Noma Jun Kurai Atsushi Shimizu Hiroyuki Sano Kazuhiro Kato Masaaki Mikami Yasuto Ueda Toshiyuki Tatsukawa Hideki Ohga Akira Yamasaki Tadashi Igishi Hiroya Kitano Eiji Shimizu Paul B. Tchounwou

Light detection and ranging (LIDAR) can estimate daily volumes of sand dust particles from the East Asian desert to Japan. The objective of this study was to investigate the relationship between sand dust particles and pulmonary function, and respiratory symptoms in adult patients with asthma. One hundred thirty-seven patients were included in the study. From March 2013 to May 2013, the patient...

2009
Kaitlyn Suski Kimberly Prather Kerri Pratt Cassandra Gaston

Mineral dust particles include many different components, but are often treated by models as insoluble resulting in limited activation to cloud droplets. Experimental critical supersaturations of mineral dust particles 0.2 μm in diameter from different sources indicate that their composition is partially soluble. Using a Köhler model, the soluble fraction of each dust sample was calculated from...

2016
Timothy McGuire Flanagan

In laboratory experiments, I study strongly-coupled dusty plasma levitated in a glow-discharge plasma. Dusty plasma is an arrangement of small dust particles in a plasma background of electrons, ions, and neutral gas. The dust particles are negatively charged because they collect electrons and ions from the background plasma. Depending on the experimental setup, the plasma’s electric field can ...

ژورنال: علوم آب و خاک 2018

Dust particles are suspended particles created from various natural and anthropogenic sources. Dust particles contain toxic metals, such as mercury (Hg), which can have harmful effects on the human health. In this study, to investigate the contamination level of Hg in the street dust in Ahvaz, 95 dust samples were collected from the pavements in the main streets. The concentration of Hg in the ...

This is the second of series on the impact of dust. It focuses on the physical, chemical and physiological effects of dust particles and aerosols. Plants of all types and classes (from algae to forest trees and everything in between) are adversely affected either directly through abrasion by airborne particles or through interference with plant physiology or indirectly through the impact on soi...

Ahmad Reza Yari, Gholamreza Goudarzi, Majid Farhadi, Maryam Dastoorpoor, Mehdi Vosoughi, Mohammad Javad Mohammadi, Morteza Jafari, Sahar Geravandi,

Background & Aims of the Study: According to statistics reported by the international organization, 500,000 people annually due to airborne particulate matter exposure of the air are dying prematurely. Studies show the dust storm is responsible for the 7.1 % increase of fatality. Control of particulate matter is one of the most important methods of direct and indirect effects of par...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1999
J M Prospero

Soil dust is a major constituent of airborne particles in the global atmosphere. Dust plumes frequently cover huge areas of the earth; they are one of the most prominent and commonly visible features in satellite imagery. Dust is believed to play a role in many biogeochemical processes, but the importance of dust in these processes is not well understood because of the dearth of information abo...

2003
Samee Ullah Khan

Smart Dust particles, are small smart materials used for generating weather maps. We investigate question of the optimal number of Smart Dust particles necessary for generating precise, computationally feasible and cost effective 3–D weather maps. We also give an optimal matching algorithm for the generalized scenario, when there are N Smart Dust particles and M ground receivers.

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