Other critics include Dr. David Wegman, chairman of a federal panel that in 1996 unanimously recommended the government consider lowering dust levels.
The relation found at z = 0 by Buat et al. (2007) leads to lower dust attenuation for massive galaxies by ~1 mag for log(Mstar) > 10.5[M☉] but their statistics for high mass galaxies was low.
Natural cleaning actions of rainfall, wind speed and dew are evident in the graph as these agents lowered the dust deposition density as shown in Fig. 8.
As a consequence, a bigger bed voidage creates a lower dust collection efficiency in the GBF.
The outcry following the shocking film forced the Government to act and recommendations for lower dust levels in factories were implemented.
Suggested measures for limiting exposure include using water and exhaust ventilation to lower dust levels and requiring workers to wear respirators or protective clothing, but such procedures are not always feasible.
When the dual-slit injector was applied under a 2.0 m/min filtration velocity, superior filter cleaning performance and lower dust emission were observed compared to those for the hole and nipple nozzles.
Besides lower dust deposition in the Pliocene epoch than the late Quaternary over eastern Eurasian, the loss of mineralogical and geochemical tracers over million year time scales also may lead to underestimates of time-averaged dust deposition rates in the old sites.
The hybrid aerogels can sustain uniaxial compression without brittle rupture to at least 80% strain for all prepolymer concentrations (5 50 wt%), leading to a final strength of up to 21 MPa, an E modulus up to 3.4 MPa, and an up to 400 times lower dust release rate.
The feature peak shifts to longer wavelengths with lower dust temperature for the Galactic sources.
Due to the increased combustion efficiency, the carbon dioxide content will be increased, resulting in lower dust emission when expressed in terms of 12% CO2[21, 22].
