Showing papers in "Journal of Aerosol Science in 2004"

TL;DR: In this paper, the formation rate of 3-nm particles is often in the range 0.01-10 cm −3 s −1 in the boundary layer in urban areas and in coastal areas and industrial plumes.

TL;DR: A generalised method for deconvolution of mass spectral data from the aerodyne aerosol mass spectrometer (AMS) is presented in this paper, which is designed to arithmetically separate the raw data into partial mass spectra for distinct chemical species.

TL;DR: In this paper, a new method is presented which determines the aerosol light absorption from the simultaneous measurement of radiation passing through and scattered back from a particle-loaded /bre /lter.

TL;DR: In this paper, a tandem differential mobility analyzer (DMA) is employed to measure the effective density, mass per unit mobility volume, of diesel exhaust particulate matter (PM), with slight deviations suggestive of more compact structures noted for particles at the small end of the size distribution.

TL;DR: In this article, the results of a series of comprehensive studies on particulate matter (PM) carried out in Spain from 1999 to 2001 were summarized and discussed as a function of different monitoring sites and during PM episodes.

TL;DR: In this article, the deposition of monodisperse particles in an idealized mouth-throat geometry has been studied numerically, and the continuous phase flow is solved using a RANS (Reynolds averaged Navier-Stokes) turbulence model at inhalation flow rates of 90.0 and 30.0 l / min.

TL;DR: In this article, the effects of intrasubject and intersubject variations in geometry on deposition efficiency were investigated using a set of seven geometries that span the range of key dimensions of a larger set of 80 geometry.

TL;DR: In this paper, a qualitative description of the phenomena occurring during the clogging of fibre filters by submicron liquid particles is presented. But the authors focus on the degradation of the filtration media in relation to the generated aerosol mass per unit area.

TL;DR: In this article, a cavity ring down (CRD) system was used for measurement of the optical extinction of aerosol, and the system is tested with well-characterized laboratory generated aerosols, and measured extinctions agree within 5% of predictions by Mie theory.

TL;DR: In this article, the effects of particle size, flow rate and flow Reynolds number were examined using gamma scintigraphy and gravimetry using an idealized average human mouth and throat replica.

TL;DR: In this paper, the phase and behavior of NaNO3 particles at different relative humidities, important for elucidating the role these particles play in the chemistry and radiative properties of marine regions, are presented.

TL;DR: In this article, a model for the aerodynamic behavior of fractal-like agglomerates is used as a tool to assess the performance of the scanning mobility particle sizer (SMPS) and the electrical low-pressure impactor (ELPI) for diesel exhaust measurements.

TL;DR: In this article, the authors evaluated the effect of the vortex finder shape on the characteristics of the collection efficiency of a cyclone and found that cone-shaped vortex finders had higher collection efficiencies than cylinder-shaped finders with a 15 mm diameter.

TL;DR: In this paper, a model for predicting the oral cavity deposition was derived from the data based on the particle Stokes number near the primary impaction location modified to incorporate the turbulent kinetic energy at the inlet.

TL;DR: In this paper, a volatility tandem differential mobility analyzer (VTDMA) was developed that offers high size resolution with high temporal resolution: the eight heating columns of the VTDMA-8 allow rapid measurement of the non-volatile component of aerosol particles within a narrow particle size range in about 15 min.

TL;DR: In this article, the effects of certain controllable factors on the detachment of 70 μm -diameter stainless-steel spheres from a glass surface exposed to accelerated air flow in a wind tunnel were studied.

TL;DR: In this paper, a new highly idealized mouth-throat that mimics in-vivo deposition in the human oropharynx is proposed, which is therefore an excellent candidate for use as a standard in the pharmaceutical field.

TL;DR: In this article, a 1 year measurement period at four sites in Austria was used to analyze the results from gravimetric (high volume sampling) and automated methods (TEOM® and beta-attenuation) grouping of the data according to season (average temperature and chemical composition (in particular nitrate) showed good agreement of the various methods for summer and even better for low nitrate content Correction for nitrate from experimental data and also from modeled nitrate improved the agreement also for winter data and higher nitrate concentrations.

TL;DR: In this paper, the spatial and orientational distributions of fibers in laminar and turbulent pipe flows are simulated numerically, and the simulated results are consistent with the experimental data available in the literature.

TL;DR: In this article, electrical low pressure impaction (ELPI) was modified and optimized to allow the measurement of aerosol particles from metered dose inhalers (MDIs) for anti-asthmatic drugs.

TL;DR: In this paper, a tandem differential mobility analyser system combining volatilization and humidification aerosol conditioning to allow the observation of hygroscopic behaviour for nonvolatile residues in sulphate aerosols in real time has been developed and demonstrated.

TL;DR: In this paper, the effect of rain during thunderstorms on the concentrations of atmospheric particulates was evaluated, and these measurements were compared with theoretical calculations of washout coefficients, and the experimental results for particles sizes considered in the present study lies between 1.08×10−5 and 7.58×10 −4 S −1 except for two occasions of high values for particles of 0.013 μm.

TL;DR: In this article, the authors investigate experimentally the transformation of diesel particulates within the exhaust pipe when the exhaust gas is being cooled, using a water cooler to control and adjust exhaust gas temperature, the influences of exhaust-gas cooling on mass concentration, composition, size distribution and number-averaged diameter of the particulates, under different engine operating conditions, were analyzed.

TL;DR: In this article, a multistage cascade impactor (CCI) is proposed to collect relatively large amounts of particles (mg quantities) onto an inert polyurethane foam impaction substrates.

TL;DR: In this paper, a fixed-sectional method was proposed to solve the problem of surface growth in aerosol population balance equation, which can significantly reduce the numerical diffusion caused by surface growth.

TL;DR: A radiative transfer scheme that considers absorption, scattering, and distribution of light absorbing elemental carbon (EC) particles collected on a quartz-fiber filter was developed to explain simultaneous filter reflectance and transmittance observations prior to and during thermal/optical analysis for carbonaceous aerosol as discussed by the authors.

TL;DR: In this paper, the authors investigated the episodic appearance of Saharan dust in Hungarian aerosol data obtained with proton-induced X-ray emission elemental analysis, and assigned nearly 50 local episodes to Saharan sources.

TL;DR: In this paper, PIV measurements of the time-averaged flow field in the central sagittal plane of two realistic extra-thoracic airway (ETA) geometries with a constant inspirational flow rate of 90 l / min were presented.

TL;DR: In this paper, the authors deal with the production of charged water droplets by electrohydrodynamic atomisation (EHDA) of water, in air at atmospheric pressure, in a mode stabilised by a particular corona discharge regime.

TL;DR: In this paper, a new Raman spectroscopic method for the determination of the content of graphitic carbon (GC) in atmospheric aerosol samples deposited on glass fiber filters (Pallflex E70-2075W) is presented.