aerosol particle Articles
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Deposition flux of aerosol particles and 15 PAHs in the North China Plain
Deposition fluxes of aerosol particles and 15 PAHs associated with the particles in the North China Plain were examined. The annual mean deposition fluxes of aerosol particles and 15 PAHs were 0.69 ± 0.46 g/(m2 · d) and 8.5 ± 6.2 μg/(m2 · d), respectively. Phenanthrene, fluoranthene, pyrene, chrysene, benzo[b]fluoranthene and benzo[k]fluoranthene were dominant PAHs bound to deposited aerosol ...
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Size distribution of the secondary organic aerosol particles from the photooxidation of toluene
In a smog chamber, the photooxidation of toluene was initiated by hydroxyl radical (OH·) under different experimental conditions. The size distribution of secondary organic aerosol (SOA) particles from the above reaction was measured using aerodynamic particle sizer spectrometer. It was found from our experimental results that the number of SOA particles increased with increasing the ...
By IOS Press
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Feeling like an aerosol particle
Yesterday Airmodus went flying in a wind tunnel at Sirius Sport. When the instructor let go and I was for the first time really floating on my own, I couldn’t help feeling like a tiny aerosol particle having just reached its terminal settling velocity (=180km/h). Maybe it is heathy to sometimes experience the world from the point of view of your research object. Airmodus CEO, Joonas, ...
By Airmodus Oy
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Guide to How Aerosol Particle Counters Work
Abstract Aerosol particle counters are built to rapidly count and size contaminant particles in cleanroom air and other controlled environments. Users tend to see this equipment as simply a device which, when the appropriate button is pressed, absolute results are displayed. However, it is important to be aware of the technology within the instrument in order to understand the relevance of the ...
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Urban indoor-outdoor aerosol measurements in Portugal and the global warming scenario
Aerosols play a major role both in climate change and air quality. They affect climate by interfering with radiative transfer and the atmospheric temperature. Aerosol particulate matter has also been associated with various adverse health effects. Aerosol particles' number and size distributions were measured inside and outside the houses in the urban areas of Evora and Lisbon in Portugal. The ...
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Optical and Condensation Particle Counters
Optical and condensation particle counters are the two main types of particle counters used for detecting and counting aerosol ...
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Where are all cool videos about aerosols?
Preparing for my lecture course on basic aerosol physics this autumn, I was searching for any aerosol related video material online. The first challenge was to find the right keywords, which would not lead completely off topic. After tryingaerosol,particle,atmosphere,cloudand different combinations of these, I realized there are very few clips available on youtube, and their quality is poor. ...
By Airmodus Oy
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Best Particle Counter for Sampling 5.0 µm Particles
As the aerosol particle counting experts, Particle Measuring Systems (PMS) recommends against the use of 0.1 CFM particle counters to sample and monitor 5.0 μm particles. Instead, the best particle counter has a 1.0 CFM flowrate model such as the Lasair Pro Particle counter to provide an adequate sample for the detection of 5.0 μm particles. ...
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Thermodynamics by the pool
Summer weather has finally reached Finland, so yesterday I decided to move the office to a near-by outdoor swimming facility. The poolside was quite a good place to think about thermodynamics, as it provides several every-day examples of some of the relevant phenomena: the water evaporating from the skin and creating cold shivers tells us about the latent heat in phase transitions. The kids ...
By Airmodus Oy
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Ultrafine particles in our homes
Many of us spend a lot of time at home at the moment. Does this mean we are not exposed to ultrafine particles? Not really, the HOMEChem research shows. HOMEChem campaign investigated how everyday activities impact the emissions, chemical transformations, and removal of trace gases and particles in a residential environment. In their recent publication they discuss their findings regarding 1 nm ...
By Airmodus Oy
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A Simple Guide to How Aerosol Particle Counters Work
Overview Aerosol particle counters are built to rapidly count and size contaminant particles in cleanroom air and other controlled environments. Users tend to see this as a device where a button is pressed and absolute results tumble out. However, when measuring anything small, it is important to be aware of the technology within the instrument to understand the relevance of the data generated, ...
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Can we change the world by (teaching) science?
This autumn I have been lecturing thermodynamics to second year physics students. Preparing lectures have taken a major part of my working hours, and every day I have been scanning my surroundings to find interesting every-day phenomena that I could use as examples on my lectures. For a scientist, teaching is always away from the time to actually do science. We are mainly evaluated on how many ...
By Airmodus Oy
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Airborne particle measurements: 100 LPM vs. 1 CFM particle counters in a semiconductor cleanroom environment
Abstract Many current standards define airborne particle monitoring in units of particles-per-cubic-meter (particles/m3). Often, these standards require sampling an entire cubic meter (1 m3) to provide an accurate measurement of airborne particulate levels. Using a conventional aerosol particle counter that samples 1-cubic-foot per minute (1 CFM) requires more than 35 minutes to sample 1 m3. ...
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Particle Monitoring in Sterilizing Tunnels
Portable aerosol particle counters are designed to sample ambient air at 1 cubic foot per minute (1 cfm) and no greater than 35 oC. There are however applications which are based on ambient temperatures much greater than this, such as pharmaceutical sterilizing tunnels. Sterilizing tunnels are used to ensure sterility off glassware (vials, syringes, bottles) prior to their entry onto an aseptic ...
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Blue-sky science
This August I started as visiting scientist at the Paul Scherrer Institute in Switzerland. My project focuses on understanding how, when and why vapor molecules form clusters and aerosol particles. The project is funded by the European Comission’s Horizon 2020 programme under Marie Sklodowska Curie actions. Horizon 2020 is the EU’s biggest investment in research and innovation so far ...
By Airmodus Oy
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Characterisation of biofluorescent aerosol emissions over winter and summer periods in the United Kingdom
Abstract. Primary biological aerosol panicles (PBAP) are an abundant subset of atmospheric aerosol particles which comprise viruses, bacteria, fungal spores, pollen, and fragments such as plant and animal debris. The abundance and diversity of these particles remain poorly constrained, causing significant uncertainties for modelling scenarios and for understanding the potential implications of ...
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Aeolian dust in sediment: a re-examination of methods for identification and dispersal assessed by diffuse reflectance spectrophotometry
Analyses of aeolian sediments present two main challenges: (1) when aerosol particles are collected on atmospheric filters, only a small amount of aeolian material is normally present, and (2) in these and other samples, the aeolian sediment is typically mixed with other types of particles and the aeolian material often makes up only a small percentage of the total sample. Diffuse Reflectance ...
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From ultraclean to heavily polluted
The range of aerosol particle number concentrations found commonly in the atmosphere spans several orders of magnitude, from less than 100 particles per cubic centimeter in clean background environments, e.g. Antarctica or Finnish Lapland, to millions of particles per cubic centimeter in mega-cities or close to emission sources. Large variation in concentrations can occur also naturally within a ...
By Airmodus Oy
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Manifold Particle Monitoring: Improved Accuracy
The Lasair III Aerosol Particle Counter is the latest generation of aerosol particle counter from Particle Measuring Systems. The Aerosol Manifold II is designed to work with the Lasair III counter under the control of Particle Measuring Systems facility monitoring software (Facility Net). The Lasair III particle counter uses a patented pressure measurement system to avoid the undercounting ...
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The Art of Science
What does contemporary art have to do with science? The forest surrounding Hyytiälä SMEAR II measurement station has gained one more ‘measurement device’, as artist AgnesMeyer-Brandis has built there a Teacup Tool Station. It measures the cloud forming above a teacup when the steam rising from the hot water condenses on aerosol particles. One teacup has also escaped from ...
By Airmodus Oy
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