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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Polybrominated Diphenyl Ethers –Design and Validation of Models for Photodegradation
 Veselý, Martin ; Žabová, Hana ; Kaštánek, František ; Ponec, Robert ; Jiřičný, Vladimír
Presented study predict ways of PBDE degradation using different methods – photodegradation, degradation with zero-valent metal and electrochemical degradation. Thermodynamic properties of all congeners were evaluated for predicting the degradation behavior. These properties were in this study by quantum-chemical calculations, using a semi empirical method AM1. The PBDE properties from the quantum-chemical calculation were also used to predict the wavelength of maximum absorbance, the octanol-water distribution coefficient and the gas chromatography retention times of all PBDE congeners.
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Statistický model snížení doby do poruchy způsobeného náhodným šokem
 Volf, Petr
We consider a time-to-failure of a technical object or system and a special model of its abrupt degradation caused by a random shock. It is assumed that the consequence of such an event is the shift of 'virtual' age of the object forward, i.e. the reduction of its survival time. We present a method of statistical analysis of the case, maximum likelihood estimation and the consistency of the shift estimate under both parametric (e.g. Weibull) and non-parametrized models of time-to-failure. The examples deal with simulated as well as with the real-case.
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