The long-term goal is to extend our predictive skill for mesoscale meteorology and to use that meteorology to improve prediction for the transport of aerosols and gases. We recognize the need of the Navy to have predictions of mesoscale weather for operations, of tropospheric aerosol conditions for both operations and weapons systems, and of Chemical and Biological Weapons (CBW) conditions for ...

The evolution in time of a nanoparticle (NP) aerosol released into a simulated workplace environment was investigated for different starting scenarios including (i) NP release into a particle-free atmosphere and (ii) release in presence of a pre-existing background aerosol. In each case, particle number distributions and total number concentrations in a 2 m(3) aerosol chamber were monitored ove...

When bacteria are disseminated into air, the concentration of viable cells in the aerosol decreases with time. It has been shown that part of this loss is due to impingement of cells on the surfaces of the container and to settling, but there is also considerable evidence for biological inactivation (Lester, 1948; Dunklin and Puck, 1948; Boyd and Forstat, 1953). This study has been undertaken t...

Aerosols are among the most important of atmospheric pollutants observed like the microscopic particulate matter in the lower parts of the troposphere. The main purpose of this study is introducing a new method based on satellite images processing results and nonlinear analysis (fractal based) to investigate the origin and dynamical mechanism of aerosols distribution in North Africa and the Mid...

OBJECTIVES To explore the effects of various factors related to the industry, the contaminant, and the period and type of sampling on long term declining trends in occupational exposure. METHODS Linear regression analyses were used to assess the relation between reductions in exposure and geographical location, industrial sector, type of contaminant, type of monitoring, carcinogenic classific...

It is widely recognised that the increasing atmospheric concentrations of greenhouse gases such as carbon dioxide and methane can potentially drive a significant warming process of the earth’s climate. However, a topic of more recent attention is the possibility that increased atmospheric concentrations of aerosol particles might drive a significant radiative forcing process of the planet (see,...

The upper height of a region of intense backscatter with a poorly defined boundary between this region and a region of clear air above it is found as the maximal height where aerosol heterogeneity is detectable, that is, where it can be discriminated from noise. The theoretical basis behind the retrieval technique and the corresponding lidar-data-processing procedures are discussed. We also sho...