Abstract: Disclosed is a nanocatalyst-type nanoscale composition including a nanoparticle semiconductor, plasmonic metal nanoparticles and an organic photosensitiser of the carbo-mer type. Also disclosed is a method for producing such a nano-catalyst. Also disclosed is use of the nanocatalyst for photoelectrolysis, in particular, for the photoelectrolysis of water, as well as to a power source including the nanocatalyst.

Abstract: Disclosed is a system for measuring solar radiation, with a camera having a hemispherical objective and light sensor, and a processor to: perform a geometric calibration of the camera establishing correspondence between coordinate systems of the image pixels and the camera; calculate the solid angle occupied by each pixel; perform a second calibration by comparing the theoretical position of the sun and its position in the image, establishing correspondence between the camera coordinate system and the cardinal points; calculate the angles between: each pixel and the zenith; each pixel and the azimuth; the sun and the zenith; and the sun and the azimuth; then each pixel and the sun. The next steps are: obtain a high-dynamic-range image of the sky; calculate the global horizontal irradiance, the direct normal irradiance, and the diffuse horizontal irradiance; and convert, into global horizontal luminance, direct normal irradiance and diffuse horizontal irradiance, respectively.

Abstract: Disclosed is a nanocatalyst-type nanoscale composition including a nanoparticle semiconductor, plasmonic metal nanoparticles and an organic photosensitiser of the carbo-mer type. Also disclosed is a method for producing such a nano-catalyst. Also disclosed is use of the nanocatalyst for photoelectrolysis, in particular, for the photoelectrolysis of water, as well as to a power source including the nanocatalyst.

Abstract: A compound of the formula ##STR1## wherein R is .dbd.O or ##STR2## and the rings A and B are selected from the group consisting of ##STR3## K is oxo or a protector group of oxo of the formula ##STR4## n is 2 or 3 and R.sub.1 is an ether or ester remainder, K' is oxo or a protector oxime, hydrazone or semicarbazone group and the wavy lines symbolize an isomer mixture, a process for their preparation and their use as intermediates.

Abstract: A compound of the formula ##STR1## wherein R is=0 or ##STR2## and the rings A and B are selected from the group consisting of ##STR3## K is oxo or a protector group of oxo of the formula ##STR4## n is 2 or 3 and R.sub.1 is an ether or ester remainder, K' is oxo or a protector oxime, hydrazone or semicarbazone group and the wavy lines symbolize an isomer mixture, a process for their preparation and their use as intermediates.