Showing papers in "Journal of Aerosol Science in 2001"

TL;DR: In this article, the size distributions of diesel exhaust particulate matter measured from a large number of vehicles and test engines, using a variety of diesel fuels, collapse onto a single characteristic lognormal distribution, when normalized by total particle number and plotted against a scaled diameter.

TL;DR: In this article, a method for calculating the thermodynamic properties of mixed inorganic/organic aerosols is proposed, based upon the use of existing models of inorganic (electrolyte) multicomponent solutions and water/organic mixtures in combination, together with simple thermodynamically consistent terms that express the effects of interactions between ions and organic molecules on the activities of all mixture components.

TL;DR: In this article, the authors reported measurements of the normal and tangential forces holding the particles onto the surface and found that the average tangential force was typically of order 1/100th of the average normal adhesive force, suggesting that drag forces played a more important role in resuspending a particle than lift forces.

TL;DR: The thermodesorber as discussed by the authors is an instrument to remove volatile material from aerosol particles by thermal desorption, which can be used to measure particulate emissions from combustion processes and can also be applied to atmospheric aerosols.

TL;DR: In this article, the authors studied the effect of sampling time on the bio-ability of viable airborne microorganisms and found that the microorganisms were culturable only if sampled for 10 min or less.

TL;DR: In this article, a generation chamber and sampling system was designed to characterize aerosols from a popular welding system that utilized either gas metal arc welding or flux cored arc welding techniques and the results demonstrated that the welding alloy had a marked effect on the particle size distribution, morphology and chemical aspects of the resultant fume.

TL;DR: In this paper, the authors present the development and bench testing of a versatile aerosol concentration enrichment system (VACES) capable of simultaneously concentrating ambient particles of the coarse, fine and ultrafine size fractions for conducting in vivo and in vitro studies.

TL;DR: The effects of cone dimension on cyclone performance characteristics were investigated in this paper, where three cyclones with different cone bottom diameters were measured as a function of particle size and flow rate and the measurement results suggest that flow rate strongly influenced the efficiency values and the sharpness of the efficiency curves.

TL;DR: In this paper, a mobile versatile aerosol concentration enrichment system (VACES) is designed to enhance the ambient concentrations of ultrafine (less than 0.18 μm ), fine (0.5-10 μm ) and coarse particles (2.5 − 10 μm ).

TL;DR: In this article, the concentrations of reactive oxygen species (ROS) in various particle size fractions were determined for the Taipei aerosols and for particles in vehicular exhausts.

TL;DR: In this paper, the authors have carried out a pilot study to explore the feasibility of determining the residence time of aerosols from the arctic haze using the disequilibrium between the 210 Po and 210 Pb, varied between 0 and 39 days.

TL;DR: In this paper, the authors investigated the parameters affecting the magnitude and polarity of the electric charges carried by biological particles in the airborne state and concluded that the amount of electric charge carried by aerosolized bacteria may be used as an indicator of mechanical stress.

TL;DR: In this paper, the mixture state of individual aerosol particles collected at altitudes of 1-5 km on 23 and 25 October 1997 from an aircraft flying over southern Kalimantan during the 1997 Indonesian forest fires, has been examined using the dialyses of water-soluble material with water, and organic material with benzene in conjunction with electron microscopy.

TL;DR: In this paper, experimental and theoretical results for the rapid expansion of supercritical solutions (RESS-process) are presented, and particle formation and growth in the expansion unit (inlet}capillary nozzle}supersonic free jet) of the RESS process is modelled numerically.

TL;DR: In this paper, the structures of cluster-cluster and particlecluster fractal-like aggregates were investigated and the morphological properties of aggregates undergoing partial sintering and restructuring were also investigated.

TL;DR: The fine particle losses in individual impactor stages of the electrical low-pressure impactor (ELPI) were studied in this paper, where three different loss mechanisms were considered: diffusion, space charge, and image charge deposition.

TL;DR: In this paper, a simple mechanistic model for resuspension assuming a log-normal distribution of adhesive forces is used to analyse the measurements of a series of experiments reported in the literature covering a range of particle size from sub-micron to 30 μm in both mono-layer and multi-layer deposits.

TL;DR: In this paper, the authors investigated the clearance of deposited particles in the conducting airways of the human lung using various symmetric and stochastically generated asymmetric models of the conducting tree.

TL;DR: In this paper, a simple constitutive law is derived for determining the fractal dimension of an aggregate, resulting from a coagulation event between aggregates with different fractal dimensions.

TL;DR: In this paper, an analytical formula, where the uptake coefficient is given as a function of mass accommodation coefficient, has been derived for small Knudsen number, and the independence of the uptake coefficients on mass accommodation coefficients for small knudsen numbers is demonstrated.

TL;DR: In this article, a flow reaction chamber was employed to study the interaction of soot aerosol particles with water droplets, and the size distribution changes determined with an aerodynamic particle sizer before and after the interaction.

TL;DR: In this paper, a realistic two-dimensional model of aerosol transport and deposition in the alveolar zone of the human lung was developed, using the FIDAP software package (Fluent, Inc).

TL;DR: In this paper, the low-pressure counting efficiency of three modified condensation particle counters (CPCs, TSI Model 7610) was investigated, and the authors presented a new low pressure calibration set-up, and showed the resulting CPC counting efficiency curves as function of operating pressure and temperature difference between the saturator and condenser block.

TL;DR: In this article, the authors investigated mesophile, psychrophile, and fungal colony-forming units (CFU) in air over the Gulf of Gdansk, Southern Baltic Sea and coastal locations from 1994 to 1998.

TL;DR: In this paper, a method for the determination of coagulation rate constants for monodisperse, neutral particles is described, where a differential mobility analyzer (DMA) is used to pre-prepare an aerosol and a second DMA is employed to separate the coagulated products from the original monodiscriminative particles.

TL;DR: In this paper, the evolution of polydisperse non-spherical particles undergoing coagulation and coalescence is analyzed by solving two sets of sectional equations, respectively, based on one-dimensional aerosol dynamics, considering the effect of morphological change of aggregate particles.

TL;DR: In this article, a dynamic phenomenon that occurs with the measurement of a diluted diesel-soot aerosol with an electrical low-pressure impactor (ELPI) was studied, and an experimental setup for measuring the performance of diesel particulate filters was used for this purpose.

TL;DR: In this article, a static light scattering experiment was performed within an ethylene-air diffusion flame for different flow-rates of the fuel gas, and it was shown that at the early stages of the agglomeration process, the soot aggregates first grow as elongated chain-like structures and then, at later stages, assume more compact morphologies with significantly smaller size.

TL;DR: In this article, an experimental system was designed for the study of aerosol deposition on regular arrays of uniform elements (in the form of discrete protrusions) in a turbulent ventilation duct flow using monodisperse tracer small particles, in the range 0.7-7.1 µm.