Szukana fraza: [Abstract = The formulation of mathematical model of the conductor is based on the tolerance averaging approach \(TAA\), cf. \[8\]. Considerations in this paper are restricted only to the unidirectional nonstationary heat conduction, where on the boundaries are given \[phi\]\-constant or periodic function of heat fluxes q_o = q_o\(\[phi\]t\), qk = qk\(\[phi\]t\) for every time period t, and function of initial temperature \[...\]. The effect of fibres width on the temperature field will be also examined.]