Abstract: Rubber mixtures vulcanisable with sulphur are proposed which lead to tires with a good rolling resistance and driving behavior on wet roads without the other driving characteristics deteriorating. The rubber mixtures contain a copolymer of conjugated diene and vinyl aromatic compound manufactured by emulsion polymerisation, polyisoprene, polybutadiene, silica, carbon black in a specific range of quantities and also customary additives and a vulcanisation system. A further embodiment additionally contains copolymer manufactured by solution polymerisation in specific quantity ranges, and in this embodiment the polyisoprene is an optional component.

Abstract: A solar collector panel consisting essentially of an electrically conductive substrate and of galvanically deposited projections which substantially completely cover a face of the substrate and extend away from the face to respective peaks absorb solar radiation efficiently when their peak-to-peak spacing averages 0.1 to 1 .mu.m in a direction parallel to the covered face, and the surfaces of the projections consist essentially of metal. The heat resistance of the projections can be enhanced by providing them with a core of different material, such as refractive metal oxide.

Abstract: A solar collector panel absorbing incident solar energy at a high rate while radiating only a small portion of the absorbed energy comprises aluminum or an aluminum alloy as a continuous metallic substrate carrying an anodized oxide layer not substantially thicker than 1 .mu.. The exposed anodized surface is formed with a multiplicity of pores receiving nickel rods of microscopic dimensions which project from the oxide surface. When the pores are spaced apart 0.1 to 1 .mu. and have a diameter of 0.1 to 0.5 .mu., the nickel rods being dimensioned correspondingly, the panel has the desired properties.