Ablation-thermalization principle

A special short-lime performance of thermal insulation is the ablative protection on the bottom of asiroitautical capsules returning from outer space when they are heated to sudden high temperatures by impact with the atmosphere. As principles stated below indicate, ablation is the process of resisting heat flow by using absorplancc in changes of slate from solid to liquid and lo sapor of the ablative insulation, which is [hereby lost, so that a one-time or at most a lew times of exposure is practicable. 

If the thermally induced decomposition follows the same pathway as the UV laser-induced decomposition, then it could be possible to select the polymers for LPTs according to similar principles as for UV laser ablation. The most important design features for polymers designed for UV laser ablation are an exothermic decomposition into gaseous products well-defined primary decomposition sites in the polymer main chain and a high absorptivity at the irradiation wavelengths. In future experiments these assumptions will be tested. 

Nevertheless, based on the principle of cauterization, the coagulative potential of the thermal ablation procedure itself makes the bleeding of a treated lesion quite unusual. To avoid needle track bleeding it is recommended to perform hot probe repositioning and removal (i.e. needle track ablation). Therefore, regarding the present literature bleeding in total is a rare, in most cases self-limiting, complication with a frequency of no more than 2%. 

Compared to RF ablation, which deposits thermal energy in the tissue by resistive heating using alternating current at 365-480 kHz, MW ablation uses a different principle providing theoretically several advantages. The MW antenna emits electromagnetic... 

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