Abstract: The invention relates to a portable, stand-up type LED lamp for hardening or curing of photochemically hardenable nail polish, said lamp comprising a flat lamp body provided with an illuminated panel (10) accommodating a plurality of light emitting diodes (9), an illuminated panel cover (7,7) secured on the edges of the illuminated panel by means of hinges located at opposite sides, wherein the illuminated panel cover (7,7) being divided to form two wings (7) of equal length—measured from hinges to the center—said wings (7) of the illuminated panel cover (7,7) designed so as to stand up in a position essentially perpendicular to the illuminated panel in a manner that jointly with the lamp body they form a bridge structure with said illuminating panel pointing downward, as well as a power supply unit and a switching element (3) to switch the lamp on or off.

Abstract: A method for compensating flue gas enthalpy losses of heat-recovery coke ovens, having a coke oven bank, connected to one or more boilers by one or more a flue gas channels. The operation of the coke oven chambers is periodically interrupted, during which time the coke cake is removed, and the individual coke oven chambers are kept hot during the interruption of the operation by an an externally fired additional burner providing hot flue gas. The resulting heat flow remains the same in comparison to the normal operation. In this way, the boilers, which are typically used to produce steam, can be operated economically.