منابع مشابه
Inhalation risk and particle size in dust and mist.
Respiratory Absorption and Elimination The human respiratory system has long been known to filter the air passing through it. Lord Lister demonstrated that putrefactive organisms were not present in air passing out of the lungs and in 1869 Tyndall (1881) found that air expelled towards the end of a breath failed to produce scattered light near the focus of a light beam and caused the white trac...
متن کاملSolar aureoles caused by dust, smoke, and haze.
The forward scattering of sunlight by atmospheric aerosols causes a bright glow to appear around the Sun. This phenomenon, the simplest manifestation of the solar corona, is called the solar aureole. Simple methods can be used to photograph the solar aureole with conventional and digital cameras. Aureole images permit both a visually qualitative and an analytically quantitative comparison of au...
متن کاملDust and Smoke Detection for Multi-Channel Imagers
A detection algorithm of dust and smoke for application to satellite multi-channel imagers is introduced in this paper. The algorithm is simple and solely based on spectral and spatial threshold tests along with some uniformity texture. Detailed examinations of the threshold tests are performed along with explanations of the physical basis. The detection is performed efficiently at the pixel le...
متن کاملThe Influence of Asian Dust, Haze, Mist, and Fog on Hospital Visits for Airway Diseases
BACKGROUND Asian dust is known to have harmful effects on the respiratory system. Respiratory conditions are also influenced by environmental conditions regardless of the presence of pollutants. The same pollutant can have different effects on the airway when the air is dry compared with when it is humid. We investigated hospital visits for chronic obstructive pulmonary disease (COPD) and asthm...
متن کاملSmoke in the “Smoke Rings”: ISO Observations of Dust in Collisional Ring Galaxies
Collisional ring galaxies probably result from a head-on collision between a compact companion galaxy and a gas-rich disk system. We present a review of the discovery of warm dust in five collisional rings observed by ISO which range in total Far-IR luminosity from 10 < LF IR < 10 11 L⊙. The results show that in most cases, the mid-IR (MIR) flux is often a significant fraction of the total ener...
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ژورنال
عنوان ژورنال: Nature
سال: 1958
ISSN: 0028-0836,1476-4687
DOI: 10.1038/182682a0