TY  - JOUR
A1  - Helsper, Christoph
A1  - Fißan, H. J.
A1  - Muggli, J.
A1  - Scheidweiler, A.
T1  - Verification of Ionization Chamber Theory
JF  - Fire Technology. 19 (1983), H. 1
Y1  - 1983
SN  - 1572-8099
SP  - 14
EP  - 21
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Bartz, H.
A1  - Fißan, H. J.
A1  - Kousaka, Y. (u.a.)
T1  - Response Characteristics for Four Condensation Nucleus Counters to Particles in the 3 to 50 nm Diameter Range / Bartz, H. ; Fißan, H. J. ; Helsper, C.; Kousaka, Y. ; Okuyama, K. ; Keady, R. Fruin, S. ; McMurry, P. H.; Pui, D. Y. H. ; Stolzenburg, M. R.
JF  - Journal of Aerosol Science. 16 (1985), H. 5
Y1  - 1985
SN  - 0021-8502
SP  - 443
EP  - 456
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Fißan, H. J.
T1  - Response Characteristic of a Polytec HC-15 Optical Particle Counter
JF  - Aerosols in science, medicine and technology : Physical and chemical properties of aerosols : Association for Aerosol Research: annual conference. 1980 : Gesellschaft für Aerosolforschung: annual conference. 1980 : Aerosols in science, medicine and technology : Physical and chemical properties of aerosols : Associa-tion for Aerosol Research: annual conference. 1980 : Gesellschaft für Aerosolforschung: annual conference. 1980 : Schmallenberg, 22.10.80 - 24.10.80
Y1  - 1981
N1  - Journal of aerosol science. Volume 0012 ; no 003
SP  - 287
EP  - 292
PB  - Pergamon Pr.
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Mölter, W.
A1  - Haller, P.
T1  - Representative Dilution of Aerosols by a Factor of 10,000
JF  - Journal of Aerosol Science. 21 (1990), H. Suppl. 1
Y1  - 1990
SN  - 0021-8502
SP  - 637
EP  - 640
ER  - 
TY  - CHAP
A1  - Helsper, Christoph
A1  - Fissan, H. J.
A1  - Franzen, H.
ED  - Benarie, Michel M.
T1  - Particle Size Distributions of Combustion Aerosols
T2  - Atmospheric Pollution 1978 : Proceedings of the 13th International Colloquium; 25-28 April 1978; Paris, France; Edited by Michel M. Benarie
N2  - 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.
Y1  - 1978
SN  - 0-444-41691-9
U6  - http://dx.doi.org/10.1016/S0166-1116(08)71583-8
SP  - 263
EP  - 266
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Fißan, H. J.
A1  - Muggli, J.
A1  - Scheidweiler, A.
T1  - Particle Number Distributions of Aerosols from Test Fires
JF  - Journal of Aerosol Science. 11 (1980), H. 5-6
Y1  - 1980
SN  - 0021-8502
SP  - 439
EP  - 446
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Nießner, R.
T1  - On the Influence of the Vapour Substance on the Behaviour of an Expansion Type Condensation Nucleus Counter
JF  - Journal of Aerosol Science. 16 (1985), H. 5
Y1  - 1985
SN  - 0021-8502
SP  - 457
EP  - 461
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Fißan, H. J.
T1  - Numerical Simulation Studies and Data Reduction for Size Classifying Measurement Techniques / Fißan, H. J.; Helsper, C.
JF  - Aerosols in science, medicine and technology : conference / Gesellschaft für Aerosolforschung 7. 1979.
Y1  - 1979
SP  - 199
EP  - 205
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
A1  - Fißan, H. J.
T1  - Numerical Simulation Studies and Data Reduction for Size Classifying Measurement Techniques / Fißan, H. J.; Helsper, C.
JF  - Advances in Particle Sampling and Measurement: Proceedings, Daytona Beach, EPA 600/9 80 004, 1980
Y1  - 1980
N1  - Advances in Particle Sampling and Measurement ; (1979.10. : ; Daytona Beach/Fla.)
PB  - National Technical Information Service
CY  - Springfield, Va.
ER  - 
TY  - JOUR
A1  - Helsper, Christoph
T1  - Measurement Techniques For Ultrafine Particles
JF  - 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
Y1  - 1986
N1  - International Workshop on Ultrafine Aerosols ; (01)
CY  - Duisburg
ER  -