Abstract: The gas-permeable membrane comprises a reinforcing substrate (2) and a continuous layer (1), deposited thereonto, of a polymer based on an organosilicon rubber. The substrate (2) is made of a solid open-pore material. The layer (1) has a thickness of from 2 to 5 .mu.m and partly fills pores (3). The process for the manufacture of the gas-permeable membrane comprises preparation of a 1-20% solution of a polymer based on an organosilicon rubber in a solvent inert relative to the solid porous substrate material and capable of wetting it. The substrate is heated to a temperature by 0.5.degree.-20.degree. C. above the boiling point of the solvent and the polymer solution is sprayed onto the substrate surface in an amount of from 0.5 to 5 mg/cm.sup.2. The blood oxygenator comprises a plurality of rigid gas-permeable membranes (13) positioned one above another in a housing (17).

Abstract: A thermoelectric cryoprobe comprising a handle composed of two electrically insulated halves made of a material possessing high heat conduction. One end of the handle is tapered, and a semiconductor cooling thermoelement is arranged at the butt of the tapered end. The height of the thermoelement does not exceed the radius thereof. The surface of a commutation plate of the thermoelement is the working surface of the thermoelectric cryoprobe.

Abstract: A photoelectric solar cell device comprises a dispersing element exposed to the sun's radiation and followed in the optical path by photocells having different spectral sensitivities. Each photocell has its working surface so oriented that the light beam with the wavelength corresponding to the maximum spectral sensitivity of that photocell impinges on its working surface. The dispersing element is a hologram representing light sources with different wavelengths. The photocells are positioned in the image planes of the light sources producing the light beams of the corresponding wavelengths.

Abstract: The hereinproposed solar power unit comprises a solar energy collector made up of mirror facets and a solar energy receiver. A sun-light-sensitive surface of the receiver is exposed to a radiation flux reflected by the collector. Each facet of the collector is hermetically enclosed in a radiation-transparent convex shell filled with a reducing agent. The shells have a radius of curvature of 20 to 200 mm.

Abstract: A semiconductor photovoltaic generator is proposed which comprises a plurality of photovoltaic converters interconnected in series along their opposite surfaces by current-collecting contacts to form a monolithic structure. Every photovoltaic converter is provided with a p-n junction between the base and inverse regions. The photo-active face of the generator is made as a staircase-type structure. The area of every step is inversely proportional to the intensity of incident radiation and the width of the step is about equal to, or smaller than, the diffusion distance of minority carriers in the base region.

Abstract: The electrochemical sensor of hydrogen and hydrogen-containing reducing agents comprises a cathode which is coal activated with a selective organic catalyst for electrochemical reduction of oxygen, an anode based on the metals of the platinum group and an acidic polymeric electrolyte disposed therebetween. The proposed sensor is capable of operating in a mixture of oxygen with hydrogen or a hydrogen-containing reducing agent without separation of the components. The sensitivity of the sensor to hydrogen is 10.sup.-3 to 10.sup.-4 percent by volume.