Counting Error due to Overlapping Particles in Thermal Precipitator Samples

Counting errors due to overlapping particles in thermal precipitator samples.

A sample of airborne dust taken with the standard thermal precipitator consists of two deposits about 1 cm. long and 1 mm. wide obtained from either side of the heated wire (Green and Watson, 1935). These deposits are examined under a microscope and a count is made across each of them to estimate the number of particles collected. The particles commonly have an irregular shape and some consist ...

Extremely Overlapping Vehicle Counting

The challenging problem that we explore in this paper is to precisely estimate the number of vehicles in an image of a traffic congestion situation. We start introducing TRANCOS, a novel database for extremely overlapping vehicle counting. It provides more than 1200 images where the number of vehicles and their locations have been annotated. We establish a clear experimental setup which will le...

Evaluation of counting error due to colony masking in bioaerosol sampling.

Colony counting error due to indistinguishable colony overlap (i.e., masking) was evaluated theoretically and experimentally. A theoretical model to predict colony masking was used to determine colony counting efficiency by Monte Carlo computer simulation of microorganism collection and development into CFU. The computer simulation was verified experimentally by collecting aerosolized Bacillus ...

Novel Wet Electrostatic Precipitator for Sub - Micron Particles

The waste incineration plants, power generation utility, chemical industry, etc. require the efficient removal of submicrometer particles from raw gases. Wet electrostatic precipitators (WESP) are the most effective control device for fine aerosol from the humid raw gases. They use less energy than mechanical collection devices, have no moving parts to wear, their maintenance costs are lower, p...

Collection of submicron particles using DBD electrostatic precipitator in wire-to-square tube configuration