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The influence of obnoxious load manifests in voltage variations. One of available measures of such variations are voltage fluctuations indices: amplitude and rate. Usually the obnoxious influence is accompanied by the increase of fluctuation's amplitude. Although there are diagnostic cases when such increase is not present and the obnoxious influence manifests in increased rate of fluctuations. The...
The paper presents two measures of voltage variations in a power network: Pst indicator and voltage fluctuations indices. A differences between the two measures are revealed by the comparison. Also, an obnoxious voltage fluctuations in LV circuit are described. It is displayed that the measures used to characterize voltage fluctuations should enable identification of noxious receivers. The analysis...
Flicker is caused by the fluctuation of voltage that supplies the source of light. Such a fluctuations are accompanied by the existence of interharmonics. This paper summarizes the measurement of interharmonics accordant to IEC 61000-4-7 standard. Also included are the results of analysis of flickermeter signal chain for the input signal composed of two interharmonics. The relation between the Pst...
The subject matter of this paper concerns advanced techniques of procedures and imaging used in minimally invasive surgery and in nonoperable cases of the digestive tract tumor therapy. Examples of imaging the application of stents allowing for the performance of diagnostic and therapeutic procedures practiced by the authors are presented. Stenting with self-expanding stents can be an effective minimally...
A range of minimally invasive interventions is still expanding because the performed procedures may often be more potent and precise than the classical operations. Effectiveness and precision can especially be improved when some combined methods of imaging are used. Videoendoscopy imaging and X-ray imaging are two complementary methods applied during the intervention presented in the paper. These...
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