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33 Newest Publications about the topic particle counters

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Direct Measurements of Mass-Specific Optical Cross Sections of Single-Component Aerosol Mixtures

13-Aug-2013 | James G. Radney; Xiaofei Ma; Keith A. Gillis; Michael R. Zachariah; Joseph T. Hodges; Christopher D. Zangmeister, Analytical Chemistry, 2013

The optical properties of atmospheric aerosols vary widely, being dependent upon particle composition, morphology, and mixing state. This diversity and complexity of aerosols motivates measurement techniques that can discriminate and quantify a variety of single- and multicomponent aerosols that ...

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The secondary transfer of gunshot residue: an experimental investigation carried out with SEM‐EDX analysis

17-Jul-2013 | James French, Ruth Morgan, James Davy, X-Ray Spectrometry, 2013

Gunshot residue (GSR) is produced when a firearm is discharged and is routinely used in the forensic reconstruction of incidents involving firearms. SEM‐EDX with automated detection and analysis software was used to investigate the extent of GSR secondary transfer following the discharge of a ...

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Automatic particle detection in microscopy using temporal correlations

16-Jul-2013 | Magnus Röding, Hendrik Deschout, Thomas Martens, Kristof Notelaers, Johan Hofkens, Marcel Ameloot, Kevin Braeckmans, ..., Microscopy Research and Technique, 2013

ABSTRACT One of the fundamental problems in the analysis of single particle tracking data is the detection of individual particle positions from microscopy images. Distinguishing true particles from noise with a minimum of false positives and false negatives is an important step that will have ...

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A Land Use Regression Model for Ultrafine Particles in Vancouver, Canada

02-May-2013 | Rebecca C. Abernethy; Ryan W. Allen; Ian G. McKendry; Michael Brauer, Environmental Science & Technology, 2013

Methods to characterize chronic exposure to ultrafine particles (UFP) can help to clarify potential health effects. Since UFP are not routinely monitored in North America, spatiotemporal models are one potential exposure assessment methodology. Portable condensation particle counters were used to ...

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Measuring absolute nanoparticle number concentrations from particle count time series

16-Apr-2013 | M. RÖDING, H. DESCHOUT, K. BRAECKMANS, M. RUDEMO, Journal of Microscopy, 2013

Summary Single‐particle microscopy is important for characterization of nanoparticulate matter for which accurate concentration measurements are crucial. We introduce a method for estimating absolute number concentrations in nanoparticle dispersions based on a fluctuating time series of ...

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Dual-wavelength fluorescent detection of particles on a novel microfluidic chip

16-Jan-2013 | Hai Jiang; Xuan Weng; Dongqing Li, Lab on a Chip, 2013

This paper reports a novel lab-on-a-chip device that performs fluorescent particle counting by coupling the electrokinetically-induced pressure-driven flow and a miniaturized dual-wavelength fluorescent detection method. A novel L-shaped PDMS microchannel bonded on a thin glass slide is used to ...

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A low-cost particle counter as a realtime fine-particle mass monitor

25-Dec-2012 | Amanda L. Northcross; Rufus J. Edwards; Michael A. Johnson; Zhong-Min Wang; Kunning Zhu; Tracy Allen; Kirk R. Smith, Journal of Environmental Monitoring, 2012

Exposure to particles with aerodynamic diameters less than 2.5 μm is estimated to cause significant morbidity and mortality worldwide leading many countries to develop ambient air pollution standards and guidelines. At local scales, community and environmental justice groups are also concerned ...

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Dual-Wavelength Fluorescent Detection of Particles on a Novel Microfluidic Chip

18-Dec-2012 | Hai Jiang; Xuan Weng; Dongqing Li, Lab on a Chip, 2012

This paper reports a novel lab-on-a-chip device that performs fluorescent particle counting by coupling the electrokinetically-induced pressure-driven flow and a miniaturized dual-wavelength fluorescent detection method. A novel L-shaped PDMS microchanel bonded on a thin glass slide is used to ...

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Harmonisation of nanoparticle concentration measurements using GRIMM and TSI scanning mobility particle sizers

05-Nov-2012 | Manish Joshi, B. K. Sapra, Arshad Khan, S. N. Tripathi, P. M. Shamjad, Tarun Gupta, Y. S. Mayya, Journal of Nanoparticle Research, 2012

Regional studies focusing on the role of atmospheric nanoparticles in climate change have gained impetus in the last decade. Several multi-institutional studies involving measurement of nanoparticles with several kinds of instruments are on the rise. It is important to harmonize these ...

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Evaluation of airborne particle emissions from commercial products containing carbon nanotubes

20-Oct-2012 | Guannan Huang, Jae Hong Park, Lorenzo G. Cena, Betsy L. Shelton, Thomas M. Peters, Journal of Nanoparticle Research, 2012

The emission of the airborne particles from epoxy resin test sticks with different carbon nanotube (CNT) loadings and two commercial products were characterized while sanding with three grit sizes and three disk sander speeds. The total number concentrations, respirable mass concentrations, and ...

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