This report examines how to sample airborne radioactivity with minimal complexity and time expenditure, using conventional high-volume samplers in combination with alpha-particle spectrometry. The use of alpha spectrometry provides compensation for radon/thoron decay products collected on the filter paper of the sampler, leading to a seven-fold improvement in measurement sensitivity of artifici...

The prevention of airborne infections in emergency departments is a very important issue. This study investigated the effects of architectural features on airborne pathogen dispersion in emergency departments by using a CFD (computational fluid dynamics) simulation tool. The study included three architectural features as the major variables: increased ventilation rate, inlet and outlet diffuser...

Comparing the today’s situation to the last ISPRS congress, where the very first commercial digital large format airborne sensors ADS40 (Leica Geosystems) line scanner and DMC (ZI-Imaging now Intergraph) frame based camera were launched into the market, an increase in number of new digital airborne sensors (some of them already introduced into operational use) is clearly obvious over the last 4...

This paper discusses the detection and correction of residual motion errors, appearing in airborne SAR interferograms due to the lack of precision in the navigation system. Two techniques existing in the literature to detect such errors are presented, highlighting differences and similitudes. The effects of residual motion errors are mainly two: azimuth phase undulations and azimuth registratio...

BACKGROUND Sensitisation to cat allergen (Fel d 1) is an important risk factor for asthma in the UK. A study was undertaken to investigate the distribution of cat allergen in British homes, the aerodynamic characteristics and particle size distribution of airborne Fel d 1, and the method of removing it. METHODS Dust was collected from 50 homes with a cat and from 50 homes without a cat, and a...

Of all known pathogens, the fungi are by nature perhaps the most ideally suited to cause airborne infection. The common method of propagation among plants involves the production and dissemination of seeds or spores. Characteristic of most fungi is the ability of a single organism eventually to produce thousands of these minute aerial spores. Nature provides a marvelous excess of these tiny par...