Abstract: Ion mobility spectrometers and methods for determining the ion mobility of a sample gas in dry air as drift gas are disclosed. The ion mobility spectrometers comprise a drift chamber, a reaction chamber, a dielectric barrier discharge ionisation source, a control unit, and a DBDI source, a pressure sensor, and a temperature sensor arranged in the chamber. A light source irradiates the DBDI source with light in a wavelength range from about 240 nm to about 480 nm. The control unit is designed to set an ignition voltage of the DBDI source and to control the light source depending on a determined pressure value and a determined temperature value. The methods control and utilize the control unit for operating the ion mobility spectrometer.

Abstract: Ion mobility spectrometers and methods for determining an ion mobility spectrum of a sample are provided. The ion mobility spectrometers comprise a drift chamber and a cylindrical reaction chamber, wherein the drift chamber is designed to transport ions from a switching grid to an ion detector against an axial drift gas flow. The reaction chamber has a sample gas inlet adjacent to the switching grid for introducing a sample gas, a gas outlet opposite the switching grid for discharging drift gas and sample gas, and a local ionisation source arranged at the gas outlet. The sample gas inlet comprises gas inlets arranged oppositely on an inner circumference of the reaction chamber. The methods operate the ion mobility spectrometers to determine an ion mobility spectrum of a sample.

Abstract: Ion mobility spectrometers and methods for determining the ion mobility of a sample gas in dry air as drift gas are disclosed. The ion mobility spectrometers comprise a drift chamber, a reaction chamber, a dielectric barrier discharge ionisation source, a control unit, and a DBDI source, a pressure sensor, and a temperature sensor arranged in the chamber. A light source irradiates the DBDI source with light in a wavelength range from about 240 nm to about 480 nm. The control unit is designed to set an ignition voltage of the DBDI source and to control the light source depending on a determined pressure value and a determined temperature value. The methods control and utilize the control unit for operating the ion mobility spectrometer.

Abstract: An initialization method for a wireless network is disclosed with at least one receiver node and/or switching node and transmitter node in which one transmitter node is allocated to at least one receiver node. An operating method is also disclosed for a wireless network with at least one receiver node and/or switching node and transmitter node. At least one allocation is made between a transmitter node and a receiver node after such an initialization method with the steps of: transmission of a wireless message at the transmitter node, reception of the wireless message at one or more switching nodes, and if the switching node is not the receiver node, transmission of the wireless message at the switching node and reception of the message at the preset receiver node.

Abstract: An initialization method for a wireless network is disclosed with at least one receiver node and/or switching node and transmitter node in which one transmitter node is allocated to at least one receiver node. An operating method is also disclosed for a wireless network with at least one receiver node and/or switching node and transmitter node. At least one allocation is made between a transmitter node and a receiver node after such an initialization method with the steps of: transmission of a wireless message at the transmitter node, reception of the wireless message at one or more switching nodes, and if the switching node is not the receiver node, transmission of the wireless message at the switching node and reception of the message at the preset receiver node.

Abstract: The invention relates to an analyzer for the identification of explosives and/or chemical warfare agents, with a neutron source which causes the emission of characteristic &ggr; quanta, whereby the analysis system consists of a mobile frame to which a neutron source and a detector as well as a holder for the object are attached, with a neutron generator which contains deuterium as the target, generates neutron pulses by periodically repeated, pulsed bombardment of the target and is controlled so that short neutron pulses are emitted and repeated periodically, whereby the detector is controlled so that in cycles it detects &ggr; quanta promptly emitted from the object due to inelastic neutron scattering and neutron capture, within at least two consecutive temporal measurement windows, whereby the first measurement window at least partially overlaps temporally the neutron pulse and the subsequent second measurement window does not, whereby in the first measurement window &ggr; quanta are essentially detected du

Abstract: Apparatus for obtaining a predeterminable distribution of weight per unit area in the transverse direction of a mat formed on a movable support for the manufacture of chip board, fiber board and similar boards is described by means of which fluctuations of the raw material composition and fluctuations of the chip geometry can be compensated for, having regard to the retention of a desired distribution of weight per unit area, by varying the thickness of the pre-mat or mat, or, in the case of a mat which is built up of a plurality of layers, of at least one of the mat layers, at least region by region, by mechanical action over the width of the mat in dependence on a desired distribution of the weight per unit area over the width of the pre-mat, or of the mat or of the mat layer.