Abstract: The invention relates to the manufacture of a reinforced slab-shaped building element (E) having a length (L), a width (W) and a thickness, said slab-shaped building element (E) comprising an upper concrete plate anchored to a lower concrete plate with a top surface and a bottom surface, said upper concrete plate being cast from relatively higher strength concrete laid out upon said top surface, said lower concrete plate being of a less strong concrete, said lower concrete plate including a base contiguous with a plurality of raised portions integral therewith, said raised portions being spaced apart in the direction of said length (L) and said width (W), said plurality of raised portions defining between them a network of recesses, at least some of said recesses including reinforcing bars (R), said raised portions and said recesses together defining said top surface.

Abstract: The invention relates to the manufacture of a reinforced slab-shaped building element (E) having a length (L), a width (W) and a thickness, said slab-shaped building element (E) comprising an upper concrete plate anchored to a lower concrete plate with a top surface and a bottom surface, said upper concrete plate being cast from relatively higher strength concrete laid out upon said top surface, said lower concrete plate being of a less strong concrete, said lower concrete plate including a base contiguous with a plurality of raised portions integral therewith, said raised portions being spaced apart in the direction of said length (L) and said width (W), said plurality of raised portions defining between them a network of recesses, at least some of said recesses including reinforcing bars (R), said raised portions and said recesses together defining said top surface.

Abstract: A thermally insulating curtain for windows and rooms provided with glass or transparent material. The curtain has an outer solar-energy-absorbing surface outside a thermally insulating layer. A space is disposed between the solar-energy-absorbing surface and a transparent layer situated outside the solar-energy-absorbing layer and/or between the solar-energy-absorbing surface and the thermally insulating layer. The curtain includes a structure that transports air through the space, and a fastener for arranging the curtain on the inside of a window, so that absorbed solar energy is supplied to the room behind the curtain.

Abstract: A thermally insulating curtain for windows and rooms provided with glass or transparent material. The curtain has an outer solar-energy-absorbing surface outside a thermally insulating layer. A space is disposed between the solar-energy-absorbing surface and a transparent layer situated outside the solar-energy-absorbing layer and/or between the solar-energy-absorbing surface and the thermally insulating layer. The curtain includes a structure that transports air through the space, and a fastener for arranging the curtain on the inside of a window, so that absorbed solar energy is supplied to the room behind the curtain.

Abstract: The invention relates to the manufacture of a reinforced slab-shaped building element (E) having a length (L), a width (W) and a thickness, said slab-shaped building element (E) comprising an upper concrete plate anchored to a lower concrete plate with a top surface and a bottom surface, said upper concrete plate being cast from relatively higher strength concrete laid out upon said top surface, said lower concrete plate being of a less strong concrete, said lower concrete plate including a base contiguous with a plurality of raised portions integral therewith, said raised portions being spaced apart in the direction of said length (L) and said width (W), said plurality of raised portions defining between them a network of recesses, at least some of said recesses including reinforcing bars (R), said raised portions and said recesses together defining said top surface.