Abstract We explore background-free options to detect mid-infrared (MIR) electric transients. The MIR field and a near-infrared probe interact via sum- (SFG) difference-frequency generation (DFG) in an electro-optic crystal. An intuitive picture based on phasor representation rigorous numerical calculations are used for analysis. It turns out that separating photons generated either by SFG or D...

Background concepts of the landscape research performed at the Department of Geography of the University of Ghent are described, discussed and illustrated with some examples. The integrated approach is based upon holism, perception and evolution. Holism allows the link between landscape ecology and perception. It explains the interaction between structure and functioning and the importance of t...