Abstract: The present invention relates to colloidal quantum dots, to a process for producing such colloidal quantum dots, to the use thereof and to optoelectronic components comprising colloidal quantum dots.

Abstract: A microfluidic arrangement including a substrate in which a microfluidic structure having several adjacent channels and at least one common supply line, into which the adjacent channels merge, is formed. Each of the adjacent channels form the cylinder of a cylinder-piston arrangement for receiving an associated piston. A method for producing the type of microfluidic-arrangement is also disclosed.

Abstract: An apparatus for laser processing of a material, in particular the eye cornea, emits on to the material a train (18?) of laser radiation pulses having a pulse duration in the femtosecond range. The pulse train comprises a multiplicity of successive pulse groups, each pulse group comprising at least two laser radiation pulses (20?, 22?). The pulses of a pulse group are directed at substantially the same processing site of the material, but the pulses of successive groups are directed at substantially different processing sites of the material. According to the invention the time interval between successive laser radiation pulses of a pulse group is in the nanosecond range. In particular, the intensity or energy of the pulses within a pulse group is graduated, in such a way that a preceding prepulse (20?) has substantially lower intensity or energy than a following main pulse (22?).

Abstract: A cell connector (CC) for electrical contacting of planar current sources, the cell connector being able to be contacted electrically with the current source merely in regions. The cell connector thereby includes at least one electrically conductive layer which is configured as a transit region and via contact regions which constitute merely a fraction with respect to the total surface area of the transit region is contacted with the current source.

Abstract: Disclosed is a device for detecting bioelectric signals from spheroids comprising a measuring chamber having a measuring chamber wall which encloses a volume, which is open at least at one side, is composed of an electrically non-conducting material, and has, in at least one measuring region, an inner cross section, which corresponds as far as possible to the largest cross section of a spheroid, comprising at least a number of electrodes which are disposed in a common plane inside said measuring chamber wall and each electrode has a freely accessible electrode surface which is oriented towards the measuring region, and comprising an impedance measuring arrangement which is connected to the electrodes. The device and the method can be used to test substances in 3D biological in-vitro (three-dimensional) cell aggregates.

Abstract: The invention relates to optical arrangements which can be provided, preferably also in miniaturized form, for the most varied applications. They can be used in many sectors of life and also commercially, and indeed whenever information should be presented visually and/or optical information should be recognized and taken into account. It is the object of the invention to provide optical arrangements with which different optical information can be utilized in more complex form together in one arrangement. The optical arrangement in accordance with the invention is configured such that elements both emitting and detecting electromagnetic radiation are arranged on a common substrate or are configured thereat. A plurality of these elements are preferably present together in each case. It can, however, also be sufficient for specific applications to provide in each case an emitting or a detecting element with a plurality of the respective other elements.

Abstract: The invention relates to a method for separating differently additivated polymers based on polystyrene, the copolymers and/or blends thereof. This method is used in particular when recycling flame-retardant plastic materials, in particular from old electrical appliances. The method according to the invention is characterised by a density separation with at least one liquid or gaseous separation medium.

Abstract: The invention relates to methods of working surfaces of a coating made of hard carbon such as —C or ta-C. In accordance with the object set, a smoothing of the surface of such a coating should be achieved with a low effort and low costs and a working of contoured surfaces should be achieved. In accordance with the invention, bristle-like or plate-like elements made of a metal and connected to a rotating element are brought into point-like or linear contact with the surface of the coating. These bristle-like or plate-like elements are moved along the surface and the surface is thus smoothed.

Abstract: A device for pretreating a signal to be transmitted over a transmission path, wherein the transmission path comprises a band-pass filter whose pass-band width is smaller than a predetermined bandwidth and a non-linear amplifier, includes a linearization means for performing a linearization of the signal to be transmitted before the transmission of the same, such that a non-linearity caused by the non-linear amplifier is counteracted. Further, the device includes a signal-shaping means downstream to the linearization means comprising a frequency response such that the overall frequency response of the signal-shaping means and the band-pass filter corresponds to the frequency response of a filter whose pass-band width is at least equal to the predetermined bandwidth.

Abstract: Techniques for protecting the security of digital representations, and of analog forms made from them are presented. The techniques include authentication techniques that can authenticate both a digital representation and an analog form produced from the digital representation, an active watermark that contains program code that may be executed when the watermark is read, and a watermark agent that reads watermarks and sends messages with information concerning the digital representations that contain the watermarks. The authentication techniques use semantic information to produce authentication information. Both the semantic information and the authentication information survive when an analog form is produced from the digital representation. In one embodiment, the semantic information is alphanumeric characters and the authentication information is either contained in a watermark embedded in the digital representation or expressed as a bar code.

Abstract: Disclosed is a ventilation arrangement for buildings with heat removal from an exhaust-air flow (LAb) discharged from the building and/or from a fresh-air flow (Lzu) supplied to the building, the arrangement having a heat pump which has a coolant/water heat exchanger (WW) with a mass flow controlled by the water system and having a coolant/air heat exchanger (LWzu, LWAb) serving the fresh-air flow (Lzu) and the exhaust-air flow (LAb), the coolant/air heat exchanger (LWzu, LWAb) being connectable in series to the coolant/water heat exchanger (WW).

Abstract: An increase in the selectivity, sensitivity and the suppression of primer dimer formations, fluorescence-based gene expression analyses and gene mutation analyses is accomplished by adding bovine serum albumin to the conventional PCR reaction components. Magnesium chloride concentration is adjusted accurately depending on the Taq polymerase used.

Abstract: A system for three-dimensional measurement of inaccessible hollow spaces g. sewage canal pipes) by means of a light source and a camera, which are disposed on an inspection head or carrier. A structured light source is used, and the camera and the structured light source have a common entry and exit aperture and have before the aperture at least partially one common optical axis or parallel axes, the distance between which is substantially smaller than the distance between the source point of the pattern and the object-side principle plane of the camera lens.

Abstract: A conductivity measuring device for measuring the electric conductivity of iquids has a current source device with current electrodes connectable thereto, via which a current can be fed into the liquid, and a measuring circuit connected to two voltage electrodes.In order to reduce measuring errors on account of polarization effects, the current source device in accordance with the invention, generates the current having the rectangular waveform, wherein the measuring circuit is implemented as switched capacitor circuit comprising a measuring capacitor being connectable to and disconnectable from the voltage electrodes via a switch arrangement in time dependency of the path of the current having the rectangular waveform.

Abstract: In a process and an apparatus for determining the coercive field strength and the maximum pitch of the hysteresis cure in set-up techniques a test body is magnetized in a magnetic field of an exciter coil fed with an alternating current, as the hysteresis curve of the test body is traversed a number of times with the frequency of the alternating current and the tangential field strength on the test body surface generated by the exciter coil is detected continuously with the aid of a magnetic field strength sensor during the traversing of the hysteresis curve. From a harmonic analysis of the time course of the tangential field strength within one period there is calculated a distortion factor for the determination of the maximum pitch of the hysteresis curve.

Abstract: A monochromator apparatus comprises a monochromator (9) and a reversing device (2) which, with the aid of four reversing mirrors (10, 11, 17, 18) shifts the exit ray (13), of a monochromator (9) introduced in an intermediate focus of an external path of rays (4, 5), in the external path of rays (5) so that the external path of rays (4, 5) will not be influenced by the presence or absence of the monochromator apparatus (2, 9).