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Parameter sensitivity analysis of the theoretical model of a CR-39-based direct 222Rn/220Rn progeny monitor

Hu Jun, Hosoda Masahiro, Tokonami Shinji

Nukleonika

2020

Vol. 65, No. 2

95--98

The deposition-based direct indoor 222Rn and 220Rn progeny measurement techniques are mostly affected by the indoor environmental conditions, such as the ventilation, concentration of condensation nuclei, and reactions with the structure and its furnishings. In this study, a theoretical model of a direct 222Rn and 220Rn progeny monitor based on allyl diglycol carbonate (ADC or CR-39) was established to analyse the factors that influence the detection process by using the parameter sensitivity analysis. The aerosol parameters contributed the highest to the variance, followed by the aerodynamic parameters. With respect to the result of the Spearman’s correlation analysis, the aerosol-related and the room-related parameters are positive, whereas the aerodynamic parameters – which affect the turbulence of indoor deposition – are negative. It means that both the attachment process and the deposition process of 222Rn and 220Rn progenies are important to the performance of the progeny monitor.

Sensitivity analysis of solidification process with respect to grains geometry

Szopa R., Wojciechowska W.

Archiwum Odlewnictwa

2003

R. 3, nr 10

255--260

In the paper the influence of the grains geometry on the course of solidification process is analyzed. In order to solve the problem the parameter sensitivity analys is has been applied. The mathematical model of thermal processes proceeding in the casting domain is constructed on the basis of the micro-macro approach. On the outer surface of the domain considered the Robin condition is assumed. On the stage of numeric al simulation the combined variant of the BEM has been used.

W pracy badano wpływ geometrii ziaren na proces krzepnięcia odlewu. Rozwiązanie uzyskano wykorzystując metody analizy wrażliwości (w ujęciu bezpośrednim). Opis matematyczny procesu sformułowano w konwencji modeli mikro-makro. Na zewnętrznej powierzchni odlewu przyjęto warunek Robina. Na etapie obliczeń numerycznych wykorzystano kombinowaną metodę elementów brzegowych.