ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

The applicability of approximate nonisothermal methods for the studies of processes with critical temperature (1989)

Holender, J. M. ; Sol(Slashthrough accent mark)tys, J.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 66 (1989), S. 4743-4746

add to mindlist on the mindlist

Details

ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The applicability of peak methods of nonisothermal kinetic data analysis is considered in this paper with focus on the influence of critical temperature; cooling experiments are also discussed. The method of analysis used in the paper is based on the Johnson–Mehl–Avrami [W. A. Johnson and K. F. Mehl, Trans. AIME 135, 315 (1941) and M. Avrami, J. Chem. Phys. 7, 1103 (1939)] rate equation, combined with the modified temperature dependence of reaction rate (including critical temperature). Using this method model, temperatures corresponding to the maximum reaction rate for different cooling/heating rates were found, and the applicability of different peak methods was tested. It is concluded that only the Kissinger [J. Res. Natl. Bur. Stand. 57, 217 (1965)] method gives correct values of activation energy, and that even this method can only be applied when analyzing reactions without (or with very low) critical temperature during heating experiments.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.343835

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Isotopic composition of the radioactive fallout in Eastern Poland after the Chernobyl accident (1987)

Pieńkowski, L. ; Jastrzebski, J. ; Tys, J. ; [et al.]

Springer

Journal of radioanalytical and nuclear chemistry 117 (1987), S. 379-409

add to mindlist on the mindlist

Details

ISSN: 1588-2780

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract After the Chernobyl accident the radioactivity of air, soil, dust and grass samples, originating from Eastern Poland was investigated by gamma-ray techniques. The isotopic composition of the radioactive fission products in these samples was determined. By combining the obtained results with those from other groups the evolution of the activity ratio in air for some isotopes was gathered. It is suggested that this evolution may be related to the differences in the deposition velocities of various elements. The distributions of the activity ratio in the measured samples indicate different transport and deposition properties for the volatile and nonvolatile fission products. It is concluded that the main part of the released nonvolatile products was deposited in the form of hot particles.