Abstract: A power amplifier, particularly a gradient amplifier of a nuclear magnetic resonance tomography apparatus, has at least one switched output stage containing a power bridge circuit formed by a number of switch elements, the bridge circuit being connected to a floating intermediate circuit voltage, as well as at least one digital pulse width modulator that generates pulse-width-modulated control signals for all switch elements of the power bridge circuit from digital input signals in order to generate at least one output stage voltage according to an output stage switching clock.

Abstract: A method and an apparatus are described for recovering a payload signal from an FSK signal that has been modulated by frequency shift keying. From the modulated signal a discrete-time series of sampled values are determined for which the phase difference relative to a preceding sampled value is respectively determined as well. The method and the apparatus can be used in a digital PBX to which the modulated signal is fed via an analog telephone network.

Abstract: In order to test a hearing aid having at least one microphone, one signal processing unit and one sound transducer, a sound channel is produced between the microphone and the sound transducer. The electrical signal path in the hearing aid is interrupted, and a test signal is fed into the interrupted signal path within the hearing aid, is emitted via the sound transducer, and is passed on through the sound channel to the microphone. The signal received by the microphone is then evaluated.

Abstract: A low-voltage circuit breaker (1) has an arc-extinguishing chamber (2) and a switching gas damper (4) which consists of two partial bodies (6, 7) that are displaceable in relation to each other. One (6) of the partial bodies (6, 7) is fixed to the circuit-breaker (1), while the other (7) is pre-stressed against the first partial body (6) with an elastic restoring force (spring 12). The switching gases that; are discharged from the arc-extinguishing chamber (2) are contained inside (8) the switching gas damper (4) until the relative displacement of the partial bodies (6, 7) forms a flow outlet through which the switching gases can escape.

Abstract: The interoperation between UMTS and GSM in the handover context includes the following method steps. An authentication vector is first generated by the UMTS HLR/AuC and various UMTS authentication parameters (XRES, CK, IK and AUTN) are derived. The authentication vector is distributed, depending on the type of VLR that requests authentication vectors, whether it is a UMTS VLR or a GSM VLR. The UMTS user is authenticated either in UTRAN or in GSM BSS. When a UMTS user is attached through a UTRAN, the controlling VLR initiates UMTS authentication and key agreement. When a UMTS user is attached through a GSM BSS, the controlling VLR initiates GSM authentication and key agreement. This is done using a UMTS authentication vector or a GSM authentication vector, depending on the type of VLR controlling the GSM BSS. The user is then handed over from one system to the other.

Abstract: A foreign object impact sensor for use with combustion turbines utilizes a passive acoustic waveguide within the turbine to receive acoustic signals from foreign object impact. The magnitude of these signals is displayed and or stored using a lighted display or other suitable indicating device. The information is also recorded and stored, so that a spectrum signature can be obtained from Fourier analysis.

Abstract: A method is described in which a number of subscriber profiles are flexibly allocated to a subscriber identity module. The subscriber has a subscriber identity module in his terminal. The terminal is also associated with a subscriber identity number. However, the subscriber identity number can be associated with two or more directory numbers that are distinguished by different associated subscriber profiles. The subscriber profiles are available and can be administered in a suitable manner in the network. Depending on the current status of the profile (activated/deactivated), a mobile-terminated call is switched through or diverted, e.g. to a so-called “voice mailbox”, that is to say an answering machine.

Abstract: A first computer (6) is linked to the safety facility (4) and a second computer (12) intended to control an actuator (2) interrogates prior to any command to turn on and/or turn off the actuator (2) the first computer (6) as to the state of the safety facility (4). The second computer (12) interrogates the state of the safety facility (4) directly by sending an encrypted message. The first computer (6) forwards in one direction the question of the second computer (12) to the safety facility (4) and in the opposite direction the response of the latter. The second computer (12) verifies the consistency of the response received. The encryption code is known to the second computer (12) and to the safety facility (4) but is unknown to the first computer (6). The process is applicable to the automobile field.

Abstract: A liquid crystal display having a liquid crystal cell (1) has electrical heating formed by an electrically conductive heating layer (3) on a substrate (2). On opposite sides, a clamp (4) forming a busbar in each case reaches over the substrate (2) and bears on the heating layer (3) by a limb (5). For connection to the heating current source, a spring element (7) is arranged between a limb (6) of the clamp (4) and a printed circuit board (8).

Abstract: A bearing mechanism or support structure for an imaging medical examination apparatus, particularly a magnetic resonance apparatus or a computer tomography apparatus, has a bearing plate for the patient and an endless conveyor band or belt for transporting the bearing plate through an opening in the examination apparatus. The conveyor band can move through the opening that serves for the acceptance of the patient and is moved therethrough by means of two end rollers arranged on mutually opposite sides of the examination apparatus.

Abstract: A flow reversal control valve for use in a fuel cell. The valve includes a housing having a first end and a second end disposed along a longitudinal axis. The valve also includes a wall that defines a first passage in fluid communication with a second passage. The first passage is disposed proximate to the first end and the second passage is disposed proximate to the second end. The valve further includes a chamber in fluid communication with the first and second passages. There are flow flutes formed in the chamber. A seal is disposed in the chamber and coupled to at least one of the first and second passages. The seal has an elastomeric member disposed on a planar surface transverse to the longitudinal axis. There is a closure member disposed in at least one of the first passage, second passage and the chamber.

Abstract: A composite thermal barrier coating system includes a first composite thermal barrier coating over a portion of a substrate, and a second deposited thermal barrier coating over edge portions of the substrate. The first composite coating is relatively thick and preferably includes friable graded insulation comprising an abradable honeycomb metallic structure filled with high thermal expansion ceramic hollow spheres in a phosphate bonded matrix. The second deposited edge coating is relatively thin and preferably comprises an electron beam physical vapor deposited thermal barrier coating comprising ZrO2 and Y2O3. The friable graded insulation may be manufactured to thicknesses in excess of current thermal barrier coating systems, thereby imparting greater thermal protection. Superior erosion resistance and abrasion properties are also achieved. The composite thermal barrier coating system is useful on combustion turbine components such as ring seal segments, vane segment shrouds, transitions and combustors.

Abstract: A system and method for controlling evaporative emissions of a volatile fuel. The system preferably has a fuel vapor collection canister, a purge valve, an isolation valve, and a fuel tank. The fuel vapor collection canister includes a supply port and a discharge port. The purge valve includes an inlet port and an outlet port. The inlet port of the purge valve is in fluid communication with the discharge port of the fuel vapor collection canister. The isolation valve includes a housing, a valve body, and a seal. The housing has a first port in fluid communication with the supply port of the fuel vapor collection canister, a second port, and a fuel vapor flow path that extends between the first and second ports. The valve body is movable with respect to the housing along an axis between a first configuration and a second configuration.

Abstract: A power amplifier, particularly a gradient amplifier of a magnetic resonance tomography apparatus, has at least one switched output stage containing a power bridge circuit formed by a number of switch elements and connected to a floating intermediate circuit voltage, as well as at least one digital pulse width modulator that generates pulse-width-modulated control signals for all switch elements from a digital input signal in order to generate at least one output stage voltage according to an output stage switch clock. The digital pulse width modulator is preceded by a pre-modulator for forming the digital input signals, with at least one of the digital input signals containing an offset, preferably corresponding to half an LBS.

Abstract: A telecommunications system containing a plurality of local and transit exchanges in which signaling and traffic data are routed between remote exchanges via a network service having routing code recalculation is described. The system is adapted to provide an ISDN end-to-end supplementary service between two subscribers in which a subscriber access code is generated by modification of a called subscriber routing code, used by the calling subscriber local exchange. The local exchanges that have an applications service element for providing the ISDN supplementary service, include a mechanism to trigger a query, which is sent to a translation device whenever the supplementary service is requested and a subscriber routing code is detected. The subscriber access code returned from the translation device is forwarded to the applications service element, which, will establish an end-to-end dialogue with it's counterpart at the called subscriber local exchange and provide the ISDN supplementary service.

Abstract: A sensor assembly is used to measure the weight of an occupant seated on a vehicle seat. The sensor assembly is integrated into a bracket that is mounted between a seat structure such as a track assembly and a vehicle structure such as floor or riser. One bracket is mounted on an inboard side of the seat and a second bracket is mounted on an outboard side of the seat. Each bracket includes opposing end mounts that are mounted to the vehicle structure. Between the opposing ends, each bracket includes a pair of deflectable portions that define a mount interface for attachment to the seat structure. A central body extends between the deflectable portions to form unitary bracket member that includes the end mounts, the deflectable portions and the central body. A strain gage is mounted on each deflectable portion to measure the weight of the seat occupant.

Abstract: A method and a device for measuring the characteristics of a sample by spectral analysis. According to the method, the characteristics are calculated from the spectral data obtained by the spectral analysis, using a calibration model that has been established on the basis of reference samples. In order to improve the stability of the measuring process, an additional calculation of the characteristics (16) of the samples (1) takes place, using at least one additional calibration model (14) that has been established on the basis of additional reference samples (1″). Deviations between the characteristics (12, 16) calculated by the respective calibration models (11, 14) are determined and output.

Abstract: A method of managing fuel vapor pressure in a fuel system. The method includes locating between first and second ports a poppet and a seal cooperating with the poppet, positioning the seal in a substantially symmetrically deformed configuration so as to sense a negative pressure at a first pressure level, positioning the seal in a generally asymmetrically deformed configuration so as to vent negative pressure below the first pressure level, and positioning the seal in an undeformed configuration so as to vent positive pressure above a second pressure level. The poppet is movable along an axis. And the seal is flexible between the undeformed configuration when disengaged from the poppet, the substantially symmetrically deformed configuration when engaged with the poppet, and the generally asymmetrically deformed configuration when engaged with the poppet.

Abstract: The electronic control unit assembly (10) includes an electronic control unit (16) and a housing (18). The housing (18) include a housing first portion (28) and a housing second portion (30). The housing first portion (28) mounts to a relatively planar surface of the ECU (16). The housing second portion (30) extends from the housing first portion in a cantilever manner to at least partially cover the connector interface (22) and the plurality of connectors (24) to provide protection therefore.

Abstract: In order to control a converter (1) which is used to convert a primary input voltage (UE) into a secondary output voltage (Ua), a voltage value (Uv) derived from a secondarily detected real voltage (Uist) is compared with a reference value (UR), and a control signal (Sa) is produced as a criterion which triggers the disconnection of said converter (1) if said reference value is exceeded. The voltage value (Uv) or the reference value (UR) is manipulated during a monitoring phase in such a way that said parameter is met.