Abstract: In order to control and optimize the amount of inhalable active substance released when drugs are administered as inhalation powders, the invention calls for the use of auxiliaries consisting of mixtures of coarser particles (average particle size>20 .mu.m) and finer particles (average particle size<10 .mu.m).

Abstract: A solar installation having a collector field having at least one of planar absorbers and solar cells, the collector field being fixed in non-trackable manner of the roof, reflecting surfaces extending laterally over and beyond the absorber surfaces in shading free manner with respect to the absorbers and/or solar cells, the reflecting surfaces having associated carrier members, the reflecting surfaces with the associated carrier members being subdivided into at least two reflecting surfaces in a plane extending horizontally from the absorbers and/or solar cells, the inclinations of the reflecting surfaces increasing with increase in distance of the absorbers or solar cells from the horizontal, and a spacing between at least two of the reflecting surfaces.

Abstract: Solar power station with semiconductor solar cells for generating electric power, wherein the semiconductor solar cells are provided on a member such as a balloon or a kite which carries the solar cells into the air. The function of the balloon or kite can also be fulfilled by a glider or airship. The solar power station can be operated by allowing the system to ascend at sunrise and descend at sunset or when the wind is going to be too strong in order to avoid any demage.

Abstract: A power station includes a main pipe for a gas under pressure, a branch pipe connected to the main pipe to receive a flow of gas, an expansion machine connected to the branch pipe for conversion of pressure energy of the gas into usable energy, a heat pump including a compressor and a heat exchanger, the compressor being coupled for operation to the expansion machine, and the heat exchanger being disposed in the branch pipe for heating the gas therein, and an electrical power generator driven by the expansion machine.