TY - JOUR TI - Thermal impedance at the interface of contacting bodies: 1-D examples solved by semi-derivatives AU - Hristov Jordan Y JN - Thermal Science PY - 2012 VL - 16 IS - 2 SP - 625 EP - 629 PT - Article AB - Simple 1-D semi-infinite heat conduction problems enable to demonstrate the potential of the fractional calculus in determination of transient thermal impedances of two bodies with different initial temperatures contacting at the interface ( x = 0 ) at t = 0 . The approach is purely analytic and uses only semi-derivatives (half-time) and semi-integrals in the Riemann-Liouville sense. The example solved clearly reveals that the fractional calculus is more effective in calculation the thermal resistances than the entire domain solutions.