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The investigation of liquids with terahertz spectroscopy is an intriguing topic. There is a variety of interacting forces between the molecules which gives rise to interesting properties like phase transitions or surface tension, these make the study of liquids by terahertz spectroscopy an intricate task.
We investigate asymmetric split ring resonators (SRR) for the THz frequency range. These SRRs exhibit sharp resonances and strong field localization, which is of potential interest e.g. for biosensing of minute amount of sample material. Our near-field measurements show the local response of the SRRs on a scale much smaller than the resonance wavelength of 320 mum. Fig. 1 depicts the spatially resolved...
As the number and size of wind farms continue to grow, many countries have established or are developing a set of specific requirements (i.e., grid codes) for operation and grid connection of wind farms. The objective of these grid codes is to ensure that wind farms do not adversely affect the power system operation with respect to security of supply, reliability and power quality. This paper reviews...
Motor efficiency evaluation enables the energy savings in industry. However, because of the uninterrupted characteristic of industrial processes, traditional methods defined in IEEE Std-112 cannot be used for these in-service motors. A novel nonintrusive method for in-service motor efficiency estimation based on a modified induction motor equivalent circuit has been developed by the authors. A highly...
Flexible AC transmission systems (FACTS) devices are power electronics based shunt or series devices that are connected to the power network and can improve the system performance and the quality of supply. Application of three types of FACTS devices, a STATCOM, a SCRC and a UPFC, is studied in a 45 bus multimachine power system, as part of the Brazilian power system. The system is exposed to various...
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