منابع مشابه
Dust to Dust : Evidence for Planet Formation ?
We discuss the properties of several circumstellar debris disk systems imaged with the Hubble Space Telescope’s Near Infrared Camera and Multi-Object Spectrometer in a survey of young stars with known far-IR excesses. These dusty disks around young (∼ 5–8 Myr) unembedded stars exhibit morphological anisotropies and other characteristics which are suggestive of recent or on-going planet formatio...
متن کاملAssessment of Dust Holding Capacity of Nanofiber Media and Its Ability to Capture Synthetic Dust
Background and Aim: Evaluation of the performance of these products is mainly based on their efficiency in numerical removal of particles in the range of different sizes. While the most important features of filters are the dust holding capacity, and the ability to remove the mass of particles with different densities, fewer studies have addressed this issue. Therefore, the present study evalua...
متن کاملDust Bowl 3 Drought and dust storms
A farmer and his two sons during a dust storm in Cimarron County, Oklahoma, 1936, Photo: Arthur Rothstein The Dust Bowl, or the Dirty Thirties, was a period of severe dust storms causing major ecological and agricultural damage to American and Canadian prairie lands in the 1930s, particularly in 1934 and 1936. The phenomenon was caused by severe drought coupled with decades of extensive farming...
متن کاملPneumoconiosis due to graphite dust.
Lassar Dunner (1945a) recorded the clinical and radiological findings in five men who had been exposed to " pure graphite " dust. They had been exposed for 17, 18, 20, 20, and 34 years respectively, and no other dusts were known to have been implicated. Three of the men had cough, sputum, and dyspnoea; the other two had no complaints. Radiographs showed reticulation with nodulation, and the que...
متن کاملPulmonary response to polyurethane dust.
Weanling and 9 months or older rats were exposed to particles of an aged (PUF I) or freshly prepared (PUF II) rigid polyurethane foam by intratracheal intubation. The dose was 5 mg of particles. The response of the lung tissue was examined morphologically by serial sacrifices. Inflammation and macrophage activity were the initial responses. Fibrosis developed after 6 months. Nodular scars and p...
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ژورنال
عنوان ژورنال: Against the Grain
سال: 2016
ISSN: 2380-176X
DOI: 10.7771/2380-176x.7557