A device for use in a fluid system includes a flow perturbation element within a fluid channel. Further, the invention relates to a reduction of power consumption of mobile terminals supporting connectivity to at least two access networks. The ion exchanger of the electrode member includes an ion exchanger having an excellent surface smoothness and an ion exchanger having a large ion exchange capacity. A reset signal coupled to the control terminal causes the ferroelectric capacitor to be polarized in the first polarization state. The holder has integrated therewith a rotatable assembly adapted to be selectively received and rotated about the clip. Suitable absorbing compounds are strongly absorbing over wavelength ranges around wavelengths such as 365 nm, 248 nm, 193 nm and 157 nm that may be used in photolithography.