Abstract: A handheld air sampler device for enrichment of airborne substances and/or particles, in particular microorganisms, includes: an inlet configured for air intake into a flow channel; an outlet configured for fluidic ally connecting the flow channel to an external vacuum device; a permeable backing element arranged in the flow channel, the backing element being configured to receive and support a filter element; and a sealing element configured for sealing a filter element received on the backing element such that, when a negative pressure is applied to the outlet, air entering the inlet forms an airstream passing the filter element and airborne substances and/or particles, in particular microorganisms, are enriched in the filter element. An air sampling arrangement includes a handheld air sampler device of this type.

Abstract: The present disclosure relates to a hydrogen-storage device and a method for releasing hydrogen from the hydrogen-storage device. Moreover, the disclosure relates to an energy-producing device and an aircraft having the hydrogen-storage device and/or the energy-producing device. According to the disclosure, a hydrogen-storage device is provided. The hydrogen-storage device includes an outer coating, an inner core material and a hydrogen releasing interface in the outer coating. The inner core material includes a composite containing a matrix material having porous carbon-containing material and a hydrogen-storage material having chemically bonded hydrogen.

Abstract: The present disclosure relates to a composite having a porous graphene oxide material (A) and ammonia borane (B), wherein the porous graphene oxide material (A) has a density of 1-100 mg/cm3, and a method for producing the same. The disclosure also relates to a hydrogen-releasing device having the disclosed composite as well as to an energy-producing device having the disclosed composite. Moreover, the disclosure relates to an aircraft having the hydrogen-releasing device and/or the energy-producing device.

Abstract: A handheld air sampler device for enrichment of airborne substances and/or particles, in particular microorganisms, includes: an inlet configured for air intake into a flow channel; an outlet configured for fluidic ally connecting the flow channel to an external vacuum device; a permeable backing element arranged in the flow channel, the backing element being configured to receive and support a filter element; and a sealing element configured for sealing a filter element received on the backing element such that, when a negative pressure is applied to the outlet, air entering the inlet forms an airstream passing the filter element and airborne substances and/or particles, in particular microorganisms, are enriched in the filter element. An air sampling arrangement includes a handheld air sampler device of this type.

Abstract: The invention refers to the method for the utilization of low-concentration mixtures of a combustible gas and air with the stable recovery of heat and the flow-reversal device for the embodiment of the method.