Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Jaakko Yli-Ojanperä"'
Autor:
Tuukka Petäjä, Aino Ovaska, Pak Lun Fung, Pyry Poutanen, Jaakko Yli-Ojanperä, Jari Suikkola, Mikko Laakso, Taneli Mäkelä, Jarkko V. Niemi, Jorma Keskinen, Anssi Järvinen, Joel Kuula, Mona Kurppa, Tareq Hussein, Sasu Tarkoma, Markku Kulmala, Ari Karppinen, Hanna E. Manninen, Hilkka Timonen
Publikováno v:
Frontiers in Environmental Science, Vol 9 (2021)
Poor air quality influences the quality of life in the urban environment. The regulatory observation stations provide the backbone for the city administration to monitor urban air quality. Recently a suite of cost-effective air quality sensors has em
Externí odkaz:
https://doaj.org/article/0b26593272b4462d976c1a21a150f073
Publikováno v:
Aerosol Science and Technology. 52:828-840
A Faraday cup aerosol electrometer based electrical aerosol instrument calibration setup from nanometers up to micrometers has been designed, constructed, and characterized. The set-up utilizes singly charged seed particles, which are grown to the de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3668b1338a47f197bfc693575001bc65
https://doi.org/10.1080/02786826.2018.1472742
https://doi.org/10.1080/02786826.2018.1472742
Publikováno v:
Aerosol Science and Technology. 51:20-29
We introduce a particle charge-size distribution measurement method using a differential mobility analyzer and an electrical low pressure impactor in tandem configuration. The main advantage of this type of measurement is that it is suitable for a wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9154a53e5507561ae026d175fc42f18a
https://doi.org/10.1080/02786826.2016.1256469
https://doi.org/10.1080/02786826.2016.1256469
Publikováno v:
Aerosol Science and Technology. 50:373-379
This study introduces a new bipolar measurement routine for particle number concentration calibrations. In the new routine, singly-charged particles of opposite polarities are measured sequentially with a Faraday cup aerosol electrometer (FCAE). We c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71a2c95fd9459bc6099726bbe5956721
https://doi.org/10.1080/02786826.2016.1153035
https://doi.org/10.1080/02786826.2016.1153035
Autor:
Jyrki M. Mäkelä, Juha Harra, Jorma Keskinen, Paxton Juuti, Jaakko Yli-Ojanperä, Anssi Arffman, Heino Kuuluvainen, Ossi Vuorinen
Publikováno v:
Journal of Aerosol Science. 86:32-43
The critical velocity of rebound was determined for spherical silver aerosol particles in the size range of 20–1000 nm. A novel instrument, a variable nozzle area impactor, was especially designed for measuring the particle–surface interaction as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::427a2e93c92276acd95701bcfb89a4cb
https://doi.org/10.1016/j.jaerosci.2015.04.003
https://doi.org/10.1016/j.jaerosci.2015.04.003
Autor:
Juha Harra, Paxton Juuti, Minnamari Vippola, Eleftheria Roumeli, Miika Sorvali, Jaakko Yli-Ojanperä, Janne Haapanen, Mari Honkanen, Jyrki M. Mäkelä
Publikováno v:
Aerosol Science and Technology. 49:767-776
Silica and titania aerosol nanoparticles are coated with silver through a physical coating process. The silver is evaporated in a tubular furnace flow system and condensed on the ceramic carrier particles with diameters of approximately 100 nm. The t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::414fa1a26392f6e7e903557353c59841
https://doi.org/10.1080/02786826.2015.1072263
https://doi.org/10.1080/02786826.2015.1072263
Autor:
Anssi Arffman, Juha Harra, Jorma Keskinen, Joni Kalliokoski, Panu Karjalainen, Topi Rönkkö, Jaakko Yli-Ojanperä, Liisa Pirjola
Publikováno v:
Journal of Aerosol Science. 78:97-109
This study introduces the calibration and performance evaluation of a new high-resolution low-pressure cascade impactor (HRLPI). It is a 10-stage cascade impactor designed to be used with the electrical detection of aerosol particles. The particle si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dcf4de04c5cc904f6245d7a841d76069
https://doi.org/10.1016/j.jaerosci.2014.08.006
https://doi.org/10.1016/j.jaerosci.2014.08.006
Autor:
Sanna Saarikoski, Miska Olin, Anu Kousa, Antti Rostedt, Jarkko V. Niemi, Liisa Pirjola, Hilkka Timonen, Erkka Saukko, Pekka Nousiainen, Jorma Keskinen, Henna Silvennoinen, Miikka Dal Maso, Risto Hillamo, Jaakko Yli-Ojanperä, Panu Karjalainen, Topi Rönkkö, Heino Kuuluvainen, Anssi Järvinen
In densely populated areas, traffic is a significant source of atmospheric aerosol particles. Owing to their small size and complicated chemical and physical characteristics, atmospheric particles resulting from traffic emissions pose a significant r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a96a7d5a79ea74a4f9487f1fd71c4c6
https://trepo.tuni.fi/handle/10024/126189
https://trepo.tuni.fi/handle/10024/126189
Autor:
Ville Niemelä, Steve Layzell, Jaakko Yli-Ojanperä, Jorma Keskinen, Anssi Järvinen, Ari Ukkonen
Publikováno v:
Journal of Aerosol Science. 77:16-30
The Bipolar Charge Analyzer (BOLAR, Dekati Ltd.) is a new commercial instrument developed to characterize bipolar charge and charge-to-mass ratio of powders and inhaled aerosols as a function of particle size. The instrument combines aerodynamic size
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f6cebbd5207b745e40ea4a1362b6799
https://doi.org/10.1016/j.jaerosci.2014.07.004
https://doi.org/10.1016/j.jaerosci.2014.07.004
Publikováno v:
Aerosol Science and Technology. 48:1022-1030
The Pegasor PPS-M sensor is an electrical aerosol sensor based on diffusion charging and current measurement without particle collection. In this study, the role and effect of each component in the instrument is discussed shortly and the results from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f1f926fe4587af2524f70f5dbdecb8e
https://doi.org/10.1080/02786826.2014.951023
https://doi.org/10.1080/02786826.2014.951023