Abstract: A cooling package for a vehicle, such as an agricultural tractor, having a heat exchanger with a fan providing air flow and a charge air cooler assembly that airflow is routed through multiple times in order to cool a compressed charge of air. As the temperature rise experienced by the cooling airflow is relatively minor compared to the initial temperature of the compressed charge of air, the airflow is initially routed through an outlet-side portion of the charge air cooler to cool the compressed charge of air towards the outlet side of the charge air cooler, and subsequently routed through an inlet-side portion of the charge air cooler to cool the compressed charge of air towards the inlet side of the charge air cooler.

Abstract: A pre-filter assembly for a vehicle arranged with an aspiration duct extending between the pre-filter and a fan of the vehicle. A variable valve element is provided as part of the aspiration duct adjacent the fan, such that the aspiration rate through the duct can be controlled by appropriate variation of the valve element, to control the rate of airflow drawn through the aspiration duct by the fan. This allows for the aspiration rate of the pre-filter to be at least partly independent of the flow rate of the fan, without the need for an additional motor-driven blower unit.

Abstract: A cooling package for a vehicle, such as an agricultural tractor, having a charge air cooler assembly configured such that airflow is routed through a charge air cooler multiple times in order to cool a compressed charge of air. As the temperature rise experienced by the cooling airflow is relatively minor compared to the initial temperature of the compressed charge of air, the airflow is initially routed through an outlet-side portion of the charge air cooler to cool the compressed charge of air towards the outlet side of the charge air cooler, and subsequently routed through an inlet-side portion of the charge air cooler to cool the compressed charge of air towards the inlet side of the charge air cooler.

Abstract: A heat exchanger system for an agricultural vehicle. The heat exchanger system has at least two separate heat exchanger assemblies, where an adjustable baffle is used to vary the airflow between the heat exchanger assemblies, accordingly varying the cooling effect of the assemblies, based on system requirements. The adjustable baffle may be arranged to restrict or block at least a portion of a heat exchanger to reduce airflow through the exchanger, to provide a flow bypass of an exchanger, and/or to proportionally adjust the airflow through a pair of heat exchangers provided as part of a single heat exchanger assembly.

Abstract: A pre-filter assembly for a vehicle arranged with an aspiration duct extending between the pre-filter and a fan of the vehicle. A variable valve element is provided as part of the aspiration duct adjacent the fan, such that the aspiration rate through the duct can be controlled by appropriate variation of the valve element, to control the rate of airflow drawn through the aspiration duct by the fan. This allows for the aspiration rate of the pre-filter to be at least partly independent of the flow rate of the fan, without the need for an additional motor-driven blower unit.

Abstract: The invention relates to a method of analyzing particles, in particular particles of diameter less than 1 ?m, the method comprising the following steps: firing laser shots into a cold plasma (45) at low pressure; using an optical spectrometer device (60) to acquire emission spectra of the light emitted by the plasma as a result of the laser shots, in such a manner that for each acquired spectrum, an acquisition period begins no later than 100 ns after firing the laser shot; and analyzing the particles present in the plasma on the basis of the emission spectra. A system for detecting and/or analyzing particles by performing the method.

Abstract: The invention relates to a method of analyzing particles, in particular particles of diameter less than 1 ?m, the method comprising the following steps: firing laser shots into a cold plasma (45) at low pressure; using an optical spectrometer device (60) to acquire emission spectra of the light emitted by the plasma as a result of the laser shots, in such a manner that for each acquired spectrum, an acquisition period begins no later than 100 ns after firing the laser shot; and analyzing the particles present in the plasma on the basis of the emission spectra. A system for detecting and/or analyzing particles by performing the method.

Abstract: Methods and apparatus for the correction of Doppler frequency offset in a terrestrial wireless communications system are described, comprising: determining a first estimation of frequency offset f1 in a received signal over a first time period of the received signal; determining a second estimation of frequency offset f2 in a received signal over a longer time period of the received signal; and determining an overall frequency offset fO based on both the first and second estimations. The determined offset may be applied to the received signal in conventional ways.