Abstract: A wind power unit comprising a mast, a rotor with several blades, a nacelle and optionally further components around which there is a flow, is disclosed. The surfaces of the mast and/or the rotor blades and/or the nacelle and/or the further components at least partly comprise recesses for improvement of the flow.

Abstract: In a diagnostic method for at least one ball bearing, in particular for an angular-contact ball bearing for bearing a rapidly rotating spindle, mechanical vibration caused by the respective angular-contact ball bearing is acquired by at least one vibration sensor and outputted as a corresponding vibration signal. At least one bearing characteristic, fundamental kinematic frequency dependent on a current bearing rotational frequency is determined by computation. A corresponding bearing frequency in a measurement frequency spectrum of the respective vibration signal is determined by measurement. A first diagnostic message is output when at least one of the determined bearing frequencies deviates by a respective prescribed frequency deviation from the corresponding computational fundamental kinematic frequency.

Abstract: A method is disclosed for processing medical image data which image a structure layer by layer, the image data for at least some layers respectively including a plurality of layer images. In at least one embodiment, the method includes segmentation of the structure in the layer images and determination respectively of a position of a point in a layer image. In at least one embodiment, at least one layer image set is furthermore compiled on the basis of the representative points in the layer images.

Abstract: A telecommunications system including a plurality of switches defining an Ethernet ring; a plurality of virtual local area networks defined on the Ethernet ring, defining a number of virtual local area networks (VLANs) equal in number to the number of links; and a ring recovery system configured to recover from a link failure by rerouting traffic to a destination on the Ethernet ring via a VLAN not including a failed link.

Abstract: The invention relates to a component that is suitable for use as a sliding bearing. The invention further relates to a method for the production of said component. The design of the component according to the invention provides a layer of a light metal material (13), which is provided with an oxide layer (15) containing pores (16) in the direction of the sliding surface (23) of the component. A hard material (18) is placed in the pores, which greatly increases the firmness of said layer region, thus creating the mechanical firmness for use as a sliding bearing. In order to counteract the tendency of said firm layer region to experience brittle failure, the oxide layer (15) is coated with a solid lubricant layer (20). Said solid lubricant layer comprises a metallic, ductile matrix (21), which distributes a force (F) acting at certain points over a larger surface region (b).

Abstract: A method (100) for positioning and operating components (18, 22) of an X-ray C-arm system (10) during repeated angiographic medical procedures.

Abstract: A method for carrying out comparison between the as-built state of an industrial plant and the associated CAD planning model, characterized in that the comparison is achieved by superimposition of unreliable components of the CAD model and digital images on the plant, whereby the superimposition is computed without any particular instrumentation within the plant, but only based on selected reliable components from the CAD model, whose physical installations are visible in the images.

Abstract: A method is disclosed for at least partly determining and/or adapting an attenuation map used for attenuation correction of Positron Emission Tomography image data sets in a combined Magnetic Resonance-Positron Emission Tomography device. In at least one embodiment of the method, at least one one-dimensional magnetic resonance data set of a patient is recorded along one imaging direction; the boundaries of at least one part of the body of the patient intersected by the imaging direction are determined from the one-dimensional magnetic resonance data set; and the attenuation map is determined and/or adapted at least partly as a function of the boundaries determined.

Abstract: The invention relates to a compressor system (1), particularly for conveying gases or gas/oil mixtures in the offshore area, with a seawater-tight housing (2) with at least one access opening (3) for gases or gas/oil mixtures which are to be compressed, and with at least one outlet opening (4) for the compressed gases or gas/oil mixtures. In the housing (2), a compressor (8) is disposed, which is connected at the inlet side to the access opening (3) and, at the outlet side, to the outlet opening (4). An electric motor (7), which has a stator assembly (71) and a rotor assembly (72) for driving the compressor (8), is disposed in the housing (2). According to the invention, the stator assembly (71) can be cooled over an inner side (GI) of the housing (2) of the compressor system (1).

Abstract: A method and a device for obtaining a volume data set of a mobile tissue or organ of a patient by a C-arm X-ray device are provided. An electromagnetic sensor of a position detection system is arranged indirectly on the tissue or organ. The X-ray device obtains a plurality of X-ray projections from the tissue or organ from various projection directions. A first method consists of reconstructing a volume data set from the X-ray projections, in which the electromagnetic sensor adopts a position characterizing a displacement phase of the tissue or organ. A second method consists of reconstructing a volume data set from the X-ray projections captured when the electromagnetic sensor was located in a position characterizing a displacement phase of the tissue or organ. A third method does not capture an X-ray projection for the reconstruction if the electromagnetic sensor is located in a position characterizing a displacement phase.

Abstract: A lightning protection system is provided for protecting a device for exterior use, in particular a wind turbine, from damages based on a lightning stroke. The lightning protection system includes a choke element. The choke element is adapted for being mounted around a shaft of the device in such a manner that a current flow through the shaft causes a magnetic flux in the choke element.

Abstract: An apparatus for tripping an electrical switch is disclosed, which includes a selective tripping device and a power-saving mechanism. The electrical switch can be tripped by the selective tripping device by way of the power-saving mechanism.

Abstract: A clock generation system for generating first and second clock signals at slightly different clock frequencies comprising a clock signal generator providing the first clock signal, frequency dividers dividing the clock frequencies by integers to produce auxiliary signals, a timer for measuring a first time lag between first signal edges of the auxiliary signals and a second time lag between second signal edges of the auxiliary signals, a comparator device for providing an error signal by comparing the difference between the measured time lags with a predetermined time value, and a voltage-controlled oscillator controlled in dependent on the error signal to generate the second clock signal.

Abstract: In a method and system for operating a machine from the field of automation engineering, operating inputs entered at an operating unit of the machine and an identification code are transmitted via a data network to communication server software running on an external computing device. The communication server software determines MMI (machine-machine-interface) application software associated with the machine and with the operating inputs and transfers the operating inputs to the MMI application software, which in turn determines visualization data on the basis of the operating inputs. The visualization data specify a graphical output image to be represented on a display screen and are transferred to the machine via the communication server software and the data network for display. The performance characteristics of the machine can thereby be enhanced, without increasing demands on the hardware.

Abstract: A medical imaging system and a method electromagnetically track a position of structures with the medical imaging system and a C-arm arrangement. The medical imaging system contains a C-arm, a gantry, and at least one electromagnetic field generator assembly with at least one electromagnetic field generator which interacts with an electromagnetic sensor from receiving the electromagnetic radiation. Preferably, the electromagnetic sensor is positioned within a region of surgical interest in a patient. The electromagnetic field generator is directly embedded into the C-arm.

Abstract: A load balancing method for a wireless communication system, which has a backbone network, more than one Access Point connected to the backbone network and more than one client. In the method, the client transmits a Probe Request message to the more than one Access Point; the Access Point monitors its load. If the Access Point is under an overload situation, it transmits a Probe Response message to the client by the minimum transmitting power. If the Access Point is under normal load situation, it transmits a Probe Response message to the client by normal transmitting power. The client preferentially chooses the Access Point under normal load situation to access based on the signal strength of the received Probe Respond message. The method thus provides the client with a priority of the Access Points, wherein the Access Point under an overload situation has a lower priority.

Abstract: A brake arrangement of a railway vehicle includes an electrical brake device having an electronic brake controller and having an electro-pneumatic regulator with a pressure sensor. An emergency brake device has a pressure reducer in series with a valve device. A shuttle valve device is also present at a pneumatic output of the electrical pneumatic braking device and a pneumatic output of the emergency brake system and is connected at the inputs thereof. The output of the valve device is connected to a control valve device connected upstream of a brake cylinder. The brake arrangement can be a direct braking arrangement and can be converted in a simple manner to an indirect braking arrangement. The valve device is an electromagnetic emergency stop valve working according to the principle of de-energizing to close, and the pressure sensor of the electro-pneumatic regulator is connected to the output of the shuttle valve device.

Abstract: A method for localization and identification of a structure in a projection image with a system having a known system geometry, includes acquiring a preoperative computer-tomography or CT image of a structure, preprocessing the CT-image to a volume image, acquiring an intraoperative two dimensional or 2D X-ray image, preprocessing the 2D X-ray image to a fix image, estimating an approximate pose of the structure, calculating a digitally reconstructed radiograph or DRR using the volume image, the estimated pose and the system geometry, and calculating a correlation between the generated DRR and the fix image, with a correlation value representing matching between the generated DRR and the fix image. The method significantly decreases the number of wrong-level surgeries and is independent of the surgeon's ability to localize and/or identify a target level in a body.

Abstract: There is described a roller drive and a roller transport device equipped with the roller drive. The roller drive comprises an electric machine and ends, wherein at least one end has a heat-conducting end contact face. The contact face is intended for coming into heat-conducting contact with a side cheek of the roller transport device. This allows the cooling to be improved. Furthermore, the roller drive can also be designed in such a way that it has a device for accommodating electrical components, wherein the device is intended as a torque support for the electric machine. A regulating device and/or a communication device can also be integrated into the device.

Abstract: A method for aligning a wind turbine with the wind direction is provided. The method includes measuring at least one first pressure at a first side of the wind turbine's nacelle, determining the pressure difference between the measured first pressure and a second pressure, and rotating the nacelle in dependence to the determined pressure difference. A wind turbine arrangement including a nacelle, a yaw alignment controller, and a yaw drive is also provided.