Abstract: A solar photovoltaic cell with a conductive current collecting contacts embedded in a block of optical transparent polymer material between the semiconductor wafer and protective cover in such a manner that at least the section thereof which are in contact with the surface of the semiconductor wafer protrude from the polymer block. This provides for a reliable ohmic contact between the current collecting contacts and the semiconductor wafer. The disclosed geometry of the solar cell reduces the shadowing area of the semiconductor wafer by up to 90%.

Abstract: The present invention is used for diagnosis, including early diagnosis, of malignant growths, for assessment as of the extent of malignant infection, for determining of the required volume for surgical intervention, for finalizing diagnoses under clinical and dispensary conditions, for control during the process of treatment of malignant tumors, and for detection of post-operative relapses.The contrasting composition according to the present invention is characterized in that, in addition to the contrasting composition, namely, fluorescein, or salts thereof, it comprises sugar.

Abstract: According to the method of the invention, the broken end of yarn and the end of the fibrous strand are caused to move simultaneously opposite to one another and, after the ends of yarn and the fibrous strand are brought close together, they are caused to deviate from the path of their initial movement and to run at a distance from one another in such a manner that during the untwisting of the end of yarn it engages the end of the fibrous strand to form a knot. In an apparatus for carrying out the method for piecing the end of yarn to the end of the fibrous strand, there is provided a device for gripping and transferring the end of yarn to the pulling device, which is formed by a pipe having an outlet pipe connected to a source of reduced air pressure.