Abstract: An air purifier filter system comprises an air purifier filter unit and a machine readable identifier which provides information concerning the filter unit type and performance information specific to a target pollutant to be filtered by said air purifier filter unit from a plurality of different pollutants that can be filtered by that filter unit type. This information can be used to provide an end of life prediction for the filter unit or provide advice that the filter should be changed for other reasons. This enables the user to be given advance warning, and to be given instructions when it is time to change the filter unit. The instructions to change the filter unit may be more accurate than a simple timer as they can take account of the type of filter unit and the performance information. In some examples the use history of the filter unit may also be used to predict the time when it should be changed.

Abstract: An air purification system is provided which includes measurement of a concentration of a target pollutant within the air. A gas sensor is used for sensing a concentration of the pollutant (although it will detect other pollutants as well due to cross-sensitivity). A filter is provided which selectively removes the target pollutant while having a significantly smaller effect in reducing other pollutants to which the sensor is cross-sensitive. A gas sensor response is obtained before filtering, a gas sensor response after filtering, and the sensitivity characteristics of the gas sensor to the pollutant are processed, thereby to determine a gas concentration of the pollutant in the air before filtering. In this way, the concentration measurement is better than a direct measurement with the gas sensor as a result of a low selectivity of the gas sensor.

Abstract: An air purification system is provided which includes measurement of a concentration of a target pollutant within the air. A gas sensor is used for sensing a concentration of the pollutant (although it will detect other pollutants as well due to cross-sensitivity). A filter is provided which selectively removes the target pollutant while having a significantly smaller effect in reducing other pollutants to which the sensor is cross-sensitive. A gas sensor response is obtained before filtering, a gas sensor response after filtering, and the sensitivity characteristics of the gas sensor to the pollutant are processed, thereby to determine a gas concentration of the pollutant in the air before filtering. In this way, the concentration measurement is better than a direct measurement with the gas sensor as a result of a low selectivity of the gas sensor.

Abstract: A device for subjecting a fluid to a disinfecting treatment by exposing the fluid to ultraviolet light comprises a reactor (10) having an inner space (11) in which means (20) for emitting ultraviolet light are arranged, an inlet (12) for letting fluid into the inner space (11), and an outlet for letting out fluid from the inner space (11). The light emission means (20) comprise a single electrode, wherein a wall (14) encompassing the inner space (11) is adapted to function as an electrode and comprises electrically conductive material, and wherein the device further comprises means (30) which also comprise electrically conductive material, and which are arranged for locally enhancing the electrical conductivity in a space between the reactor wall (14) and the light emission means (20).

Abstract: The communication via couplings (3) for providing services defined by service parameters like video-on-demand services and audio/video calls and voice-over-internet-protocol calls and via an access system (4) for accessing a network (5) can be done more dynamically and efficiently (insight) by (basic idea) introducing service-selection-signals, service-definition-signals, service-information-signals, and by configuring terminals (1) and/or coupling-interfaces (2) and couplings (3) and the access system (4). Then users get the option of selecting one out of many services, a service-selection-server (9) coupled to and/or forming part of the access system (4) gets the service-definition-signals like for example service parameters, and couplings (3) and the access system (4) and terminals (1) and/or coupling-interfaces (2) are configured to be in conformance with said service-definition-signals. Terminals (1) are informed through service-information-signals, defining the coupling (3) to be used.

Abstract: The invention relates to a semiconductor device with a diode. The semiconductor body (10) comprises a stack of a first semiconductor region provided with a first connection conductor (5) and a second semiconductor region (2) connected to a second connection conductor (6), wherein a rectifying junction is present between the two semiconductor regions (1, 2) having opposite conductivity types. Such a device is—after a rotation through 90 degrees—suitable for surface mounting. However, in particular at high voltage and/or high power levels, the diode may suffer from breakdown or a high leakage current.

Abstract: The invention relates to a semiconductor device with a diode. The semiconductor body (10) comprises a stack of a first semiconductor region provided with a first connection conductor (5) and a second semiconductor region (2) connected to a second connection conductor (6), wherein a rectifying junction is present between the two semiconductor regions (1, 2) having opposite conductivity types. Such a device is—after a rotation through 90 degrees—suitable for surface mounting. However, in particular at high voltage and/or high power levels, the diode may suffer from breakdown or a high leakage current.