نتایج جستجو برای: dust density

تعداد نتایج: 448715  

2005
S. Wolf L. A. Hillenbrand

CPC: 1.3 Radiative Transfer PACS: 94.10.Gb-Absorption and scattering of radiation 97.21.+a-Pre-main sequence objects, young stellar objects and protostars 97.82.+k-Extrasolar planetary systems Abstract A WWW interface for the simulation of spectral energy distributions of optically thin dust configurations with an embedded radiative source is presented. The density distribution, radiative sourc...

2009
Takashi Kozasa Takaya Nozawa Nozomu Tominaga Hideyuki Umeda Keiichi Maeda

Core–collapsed supernovae (CCSNe) have been considered to be one of sources of dust in the universe. What kind and how much mass of dust are formed in the ejecta and are injected into the interstellar medium (ISM) depend on the type of CCSNe, through the difference in the thickness (mass) of outer envelope. In this review, after summarizing the existing results of observations on dust formation...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

ABSTRACT Our ability to interpret observations of galaxies and trace their stellar, gas, dust content over cosmic time critically relies on our understanding how the abundance properties vary with environment. Here, we compute surface density across times put novel constraints simulations build-up dust. We provide observational estimates consistently measured through depletion methods a wide ra...

This study has used TOMS AI as well as the reanalysis dataset of thirty-four years (1979-2012) to investigate the influence of atmospheric circulation on dust transport during the Harmattan period in West Africa, using Aerosol Index (AI) data, obtained from various satellite sensors. Changes in Inter-Tropical Discontinuity (ITD), Sea Surface Temperature (SST) over the Gulf of Guinea, and North ...

Journal: Pollution 2018

This study has used TOMS AI as well as the reanalysis dataset of thirty-four years (1979-2012) to investigate the influence of atmospheric circulation on dust transport during the Harmattan period in West Africa, using Aerosol Index (AI) data, obtained from various satellite sensors. Changes in Inter-Tropical Discontinuity (ITD), Sea Surface Temperature (SST) over the Gulf of Guinea, and North ...

Journal: :Applied occupational and environmental hygiene 2002
F. Colinet Jerome P. Flesch

Silicosis, a debilitating and potentially deadly lung disease, develops through inhalation of excessive concentrations of respirable crystalline silica dust. In underground coal mines, continuous miner operators have a high risk of overexposure to silica, with approximately 25% of compliance dust samples exceeding the permissible exposure limit. Continuous miners often extract high-silica-conte...

Journal: :Entropy 2016
Trevor W. Marshall

This article argues that a consistent description is possible for gravitationally collapsed bodies, in which collapse stops before the object reaches its gravitational radius, the density reaching a maximum close to the surface and then decreasing towards the centre. The way towards such a description was indicated in the classic Oppenheimer-Snyder (OS) 1939 analysis of a dust star. The title o...

2009
Brice Ménard Ryan Scranton Masataka Fukugita Gordon Richards

We present a simultaneous detection of gravitational magnification and dust reddening effects due to galactic halos and large-scale structure. The measurement is based on correlating the brightness of ∼85,000 quasars at z > 1 with the position of 20 million galaxies at z ∼ 0.3 derived from the Sloan Digital Sky Survey and is used to constrain the galaxy-mass and galaxy-dust correlation function...

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