@incollection{HelsperFissanFranzen1978, author = {Helsper, Christoph and Fissan, H. J. and Franzen, H.}, title = {Particle Size Distributions of Combustion Aerosols}, series = {Atmospheric Pollution 1978 : Proceedings of the 13th International Colloquium; 25-28 April 1978; Paris, France; Edited by Michel M. Benarie}, booktitle = {Atmospheric Pollution 1978 : Proceedings of the 13th International Colloquium; 25-28 April 1978; Paris, France; Edited by Michel M. Benarie}, editor = {Benarie, Michel M.}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {0-444-41691-9}, doi = {10.1016/S0166-1116(08)71583-8}, pages = {263 -- 266}, year = {1978}, abstract = {It has been observed that carcinogenic polycyclic aromatic hydrocarbons (PAH) are present in the atmosphere. Combustion processes are considered the most important sources for PAH. Among these, the burning of coal produces the highest emission, but in cities with high traffic density and low meteorological exchange activities, vehicle emissions determine the immission situation, especially in narrow streets. For estimating the potential health effects caused by PAH, it is sufficient to characterize the emission of PAH with respect to their physical state, concentrations, and, as far as the particulate phase is concerned, size distribution. The size distribution is important for transport phenomena, inhalation, and deposition in the respiratory tract. These parameters mainly depend on the combustion system, on system operating conditions, on the exhaust system, and on exhaust cooling conditions. At exhaust-gas temperatures in the range of ambient air temperatures, almost the whole emission of PAH is made up of particulate matter.}, language = {en} } @article{HelsperFissanMugglietal.1980, author = {Helsper, Christoph and Fißan, H. J. and Muggli, J. and Scheidweiler, A.}, title = {Particle Number Distributions of Aerosols from Test Fires}, series = {Journal of Aerosol Science. 11 (1980), H. 5-6}, journal = {Journal of Aerosol Science. 11 (1980), H. 5-6}, isbn = {0021-8502}, pages = {439 -- 446}, year = {1980}, language = {en} } @article{HelsperNiessner1985, author = {Helsper, Christoph and Nießner, R.}, title = {On the Influence of the Vapour Substance on the Behaviour of an Expansion Type Condensation Nucleus Counter}, series = {Journal of Aerosol Science. 16 (1985), H. 5}, journal = {Journal of Aerosol Science. 16 (1985), H. 5}, isbn = {0021-8502}, pages = {457 -- 461}, year = {1985}, language = {en} } @article{HelsperFissan1979, author = {Helsper, Christoph and Fißan, H. J.}, title = {Numerical Simulation Studies and Data Reduction for Size Classifying Measurement Techniques / Fißan, H. J.; Helsper, C.}, series = {Aerosols in science, medicine and technology : conference / Gesellschaft f{\"u}r Aerosolforschung 7. 1979.}, journal = {Aerosols in science, medicine and technology : conference / Gesellschaft f{\"u}r Aerosolforschung 7. 1979.}, pages = {199 -- 205}, year = {1979}, language = {en} } @article{HelsperFissan1980, author = {Helsper, Christoph and Fißan, H. J.}, title = {Numerical Simulation Studies and Data Reduction for Size Classifying Measurement Techniques / Fißan, H. J.; Helsper, C.}, series = {Advances in Particle Sampling and Measurement: Proceedings, Daytona Beach, EPA 600/9 80 004, 1980}, journal = {Advances in Particle Sampling and Measurement: Proceedings, Daytona Beach, EPA 600/9 80 004, 1980}, publisher = {National Technical Information Service}, address = {Springfield, Va.}, pages = {VII, 409 S.}, year = {1980}, language = {en} } @article{Helsper2003, author = {Helsper, Christoph}, title = {Messverfahren zur Charakterisierung der Abscheidung luftgetragener Partikel in Filtern}, series = {Schutzmaßnahmen vor mikrobiellen Belastungen des Innenraumes / VII. L{\"u}becker Fachtagung f{\"u}r Umwelthygiene. [Hrsg.:] Reinhard Keller ...}, journal = {Schutzmaßnahmen vor mikrobiellen Belastungen des Innenraumes / VII. L{\"u}becker Fachtagung f{\"u}r Umwelthygiene. [Hrsg.:] Reinhard Keller ...}, publisher = {Inst. f. Medizinische Mikrobiologie u. Hygiene d. Med. Univ.}, address = {L{\"u}beck}, pages = {35 -- 61}, year = {2003}, language = {de} } @article{Helsper1986, author = {Helsper, Christoph}, title = {Measurement Techniques For Ultrafine Particles}, series = {Ultrafine aerosols. Properties and behaviour. Proceedings of the 1. International Workshop on Ultrafine Aerosols of the Sonderforschungsbereich 209 'Stoff- und Energietransport in Aerosolen' -'Mass and energy transfer in aerosols'-, held at the Univ. of Duisburg on Sept. 29, 1986}, journal = {Ultrafine aerosols. Properties and behaviour. Proceedings of the 1. International Workshop on Ultrafine Aerosols of the Sonderforschungsbereich 209 'Stoff- und Energietransport in Aerosolen' -'Mass and energy transfer in aerosols'-, held at the Univ. of Duisburg on Sept. 29, 1986}, address = {Duisburg}, year = {1986}, language = {en} } @article{HelsperMoelterMoelter1986, author = {Helsper, Christoph and M{\"o}lter, W. and M{\"o}lter, L.}, title = {Korngr{\"o}ßenanalyseverfahren f{\"u}r trockene Pulver und St{\"a}ube von 0,5-25 µm}, series = {Chemie-Technik. 16 (1986)}, journal = {Chemie-Technik. 16 (1986)}, isbn = {0340-9961}, pages = {140 -- 144}, year = {1986}, language = {de} } @article{Helsper1986, author = {Helsper, Christoph}, title = {Kondensationskernz{\"a}hler und ihre Anwendung in der Reinraumtechnik}, series = {Swiss Chem. 8 (1986)}, journal = {Swiss Chem. 8 (1986)}, isbn = {0251-1703}, pages = {63 -- 66}, year = {1986}, language = {de} } @article{Helsper1988, author = {Helsper, Christoph}, title = {Kondensationskernz{\"a}hler in der Reinraummeßtechnik - Meßbereichsgrenzen nach unten verschoben}, series = {Reinraumtechnik. 5 (1988)}, journal = {Reinraumtechnik. 5 (1988)}, pages = {36 -- 39}, year = {1988}, language = {de} }