Abstract: The invention presents a method for determining the copper concentration of the substrate using the photoconductivity method in a new manner, the method comprising steps in which the photoconductivity property of the substrate is measured for a first time by an arrangement, the surface of the substrate is illuminated by illuminating means emitting photon radiation, the photoconductivity property of the substrate is measured for a second time by an arrangement, and the copper concentration of the substrate is determined from the change between the first and second time of measurement on the basis of the illumination. The invention also presents an arrangement and a software product for determining the copper concentration.

Abstract: The invention presents a method for determining the copper concentration of the substrate using the photoconductivity method in a new manner, the method comprising steps in which the photoconductivity property of the substrate is measured for a first time by an arrangement, the surface of the substrate is illuminated by illuminating means emitting photon radiation, the photoconductivity property of the substrate is measured for a second time by an arrangement, and the copper concentration of the substrate is determined from the change between the first and second time of measurement on the basis of the illumination. The invention also presents an arrangement and a software product for determining the copper concentration.

Abstract: The invention relates to a camera system and to a display device for displaying images recorded by the camera system. The camera system comprises a camera (1) provided with an optics system (2) and a photosensitive image surface (3) disposed near the optics symmetrically relative to its optic axis, the image refracted by the optics being projected onto said image surface. The photosensitive image surface is a concave spherical surface whose center of curvature is at the focal point of the optics.

Abstract: The invention relates to a process for chromatographic separation and purification of natural and synthetic nucleosides, deoxynucleosides and corresponding bases by using cross-linked xylose isomerase. In particular, nucleosides are separated from biological material, especially industrial side streams.

Abstract: The invention relates to a system and a procedure for image processing. The system comprises a data communication network (1) which serves as a channel for the transmission of the image being processed, digitized in an electronic form of representation, and an image processing device (2; 2a, 2b, 2c), which is connected to the data communication network (1) and which processes the image to enhance its visual quality to print the image to different formats. According to the invention, the image processing system comprises a classifying device (3), which automatically classifies the image, and a correcting device (4), which automatically corrects the image.