Abstract: The invention relates to a method for checking whether the transfer of liquid samples has been successful. In said method, a pipetting system or a dispensing system is made to transfer a liquid sample (1) at a specific location (2), and it is verified whether said liquid sample (1) has actually been transferred. The inventive method is characterized in that a distribution image (4) of the intensity of the heat radiation released by said specific location (2) is recorded once the liquid sample (1) has been transferred. Said method can be used in a pipetting system or a dispensing system by making such systems dispense or accept a liquid sample (1) and then checking whether said liquid sample (1) has actually reached or been accepted at the specific location (2).

Abstract: A process for improving the photoelectric properties of a laminated charge image carrier. In the process, a coating composition is prepared containing an insulating material which is doped by admixing a sensitizer and a coating of the doped composition is applied to a substrate to form a doped insulating layer. A photoconductive layer containing the sensitizer is then applied to the doped insulating layer.

Abstract: A process for improving the photoelectric properties of a laminated charge image carrier. In the process, an insulating layer, which can be doped before or after application, is applied between the substrate and the photoconductive layer. The insulating layer can also be applied in layers, one of which can be doped. Suitable dopants are acid, alkaline and halogen vapors, sensitizers and pigments.

Abstract: Long-life multilayer photoconductive members of the ZnO type are obtained when the successive layers are deposited using solvents, drying temperatures, etc. which do not affect the layers previously deposited. In such fashion, at least 4,000 cycles of use are possible.