Abstract: The invention is directed to a method for creating an optical tomogram, which comprises the steps providing an optical microscope, arranging a sample (1) in the optical coverage region of a lens (5) of the microscope, setting the focus of the lens to a particular focal plane (2), recording an image of the sample through the microscope, rotating the sample through an angle ?, optionally displacing the sample along the longitudinal axis (z) of the lens (5) and/or perpendicular to the plane of the previously recorded image (9) and continuing the method with step d) until a predetermined number of section images (9) of the sample (1) have been recorded, wherein the sample (1) is displaced along the longitudinal axis (z) of the lens (5) and/or perpendicular to the plane of the previously recorded image (9), in accordance with step f), at least once during a rotation of the sample through 360°.

Abstract: A drive device for generating oscillations, especially for the blade of a microtome, with a power generator and a power transmission element, which with the power generator is movable in a predetermined oscillation direction (S), whereby the power generator includes a combination of a permanent magnet part and a coil part, whereof one part is fixed stationary on a holder and the other part on the power transmission element, respectively, and the power transmission element is formed by a vibrational arm, which is fixed at one end to the holder and which is elastically bendable in the oscillation direction and still in all other directions.

Abstract: A method of manufacturing quantum structures, in particular quantum dots and tunnel barriers and also a component with such quantum structures wherein in that a substrate is structured by the intentional formation of trenches so that material remains between oppositely disposed trench sections, with a transition from a broader region to a narrower region; wherein further material is deposited onto the substrate so that differential growth sets in on the remaining regions of the substrate and an inclined surface arises in the transition region between the broader region and the narrower region and a material height increase arises in the narrower region relative to the broader region; and wherein a different material, or a material of different conductivity, is subsequently deposited, whereby a tunnel barrier arises on the inclined surface and/or a quantum dot arises at the upper end of the inclined surface.