The present paper treats the rotor angle estimation problem in a singlemachine infinite bus setup. The components of the infinite bus voltage phasor are estimated in a coordinate frame that turns with the rotor by means of a Kalman-like filter from exclusively local measurements. Therefore, in addition to the rotor angle, the observer also provides an estimate of the infinite bus voltage. The p...

Under-frequency load shedding (UFLS) is a classic and commonly accepted measure used to mitigate the frequency disturbances in case of loss-of-generation incidents AC power grids. Triggering UFLS classically done at thresholds when system collapse already close happening. The renewed interest for synchronous condensers due global trends on massive commissioning non-synchronous renewable generat...

the mean noise levels were measured in the different sections of six representative mills in the isfahan area, and audiometric measurements were made in 282 male workers employed in these mills. the mean noise levels were on average 95 dba in the weaving sections and 88 d ba in the spinning sections. the audiometric findings showed a significant loss of gearing in the textile workers as compare...

A popular signal processing technique for beam position measurements uses the principle of amplitude-modulation -tophase-modulation (AM/PM) conversion and phase detection. This technique processes position-sensitive beam-imagecurrent probe-signals into output signals that are proportional to the beam's position. These same probe signals may be summed and processed in a different fashion to prov...

three new rimantadine schiff bases (rsbs) were prepared, and then the interaction of rsbs with bovine serum albumin (bsa) was investigated using fluorescence, synchronous fluorescence, uv-vis absorption spectroscopy under physiological conditions. the results showed that the three rsbs effectively quenched the intrinsic fluorescence of bsa via static quenching. binding constant (ka), number of ...

This paper presents a new control method for a three-phase four-wire Unified Power Quality Conditioner (UPQC) to deal with the problems of power quality under distortional and unbalanced load conditions. The proposed control approach is the combination of instantaneous power theory and Synchronous Reference Frame (SRF) theory which is optimized by using a self-tuning filter (STF) and without us...

A Phased Array Doppler Sonar (PADS), as developed at SIO, images both acoustic backscatter intensity and Doppler shift over areas up to 90 degrees in bearing by 500 m in range. Sequences of images are recorded continuously for up to two months, with individual “pings” 0.5 to 1.0 seconds apart. The images permit two independent estimates of the mean velocity to be formed over the imaged area: on...

The aim of this study is to detect and visualise the influence span-wise coherence on propagating sound waves emanating from a flow around circular cylinders with variations local radius. Synchronous particle image velocimetry (PIV) microphone measurements are performed in wind tunnel nozzle size 0.4 m×0.4 m at maximum speed U∞ = 43m s−1 . test section surrounded by full anechoic chamber approx...