Harmonic current extraction of shunt active power filter based on prediction current technique - Hysteresis PWM

Due to the wide spread of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the ac mains currents has became a major concern due to the adverse effects on all analysis and simulation using MATLAB-SIMULINK of a three-phase shunt active equipment. This paper presents the Shunt Active Power Filter (SAPF) to compensate the generated harmonics by 3-phase Rectifier Bridge fed R-L load. The harmonic current extraction is based on prediction current extraction technique -hysteresis PWM generation pattern

Synthesis and Evaluation of Antioxidant Activity of Some New Heterocyclic Compounds Bearing the Benzo[B]Furan Moiety

New compounds were synthesized by the reaction of 3-acetyl-5- methoxy-2-methylbenzofuran (1) with cyanoacetylhydrazine which afforded the hydrazide hydrazone derivative 2. Compound 2 underwent a series of heterocyclization reactions to give the new pyrazole, isoxazole, cyclopentanothiophene, thiazole, triazole, 2H-chromene and pyridone derivatives (3-13). The elemental and spectral data (IR, 1H NMR and MS) characterized their structures. Screening for some selected compounds was carried for their potential antioxidant activities using ABTS. Among the tested samples compounds 9, 11, 5 and 10 exhibited promising activity

Hysteresis PWM of shunt active power filter based on prediction harmonic current technique

This article is available (Open Access) to view at: http://www.globalcis.org/dl/citation.html?id=JNIT-321The growth in electronic devices applications increases the non linear loads in power systems. These loads produce undesired harmonics which causes many problems. This paper presents the Shunt Active Power Filter (SAPF) to compensate the generated harmonics by 3-phase Rectifier Bridge fed R-L load. The harmonic current extraction is based on prediction current extraction technique -Hysteresis PWM generation pattern

DNA damage induced by furocoumarin hydroperoxides plus UV (360 nm)

Wben irradiated at 360 nm, furocoumarins with a hydroperoxide group in a side chain effciently give rise to a type of DNA damage that can best be explained by a photoinduced generation of hydroxyl radicals from the excited pbotosensitizers. The observed DNA damage profiles, i.e. the ratios of single-strand breaks, sites of base loss (AP sites) and base modifications sensitive to fonnamidopyrimidine-DNA glycosylase (FPG protein) and endonuclease m, are similar to the DNA damage profile produced by hydroxyl radicals generated by lonizing radiation or by xanthine and xanthine oxidase in the presence of Fe(III)-EDTA. No such damage is observed with the corresponding furocoumarin alcohols or in the absence of near-UV radiation. The damage caused by the photo-excited hydroperoxides is not influenced by superoxide dismutase (SOD) or catalase or by D2O as solvent. The presence of t-butanol, however, reduces both the formation of single-strand breaks and of base odifications sensitive to FPG protein. The cytotoxicity caused by one of the hydroperoxides in L5178Y mome lymphoma cells is found to be dependent on the near-UV irradiation and to be much higher than that of the corresponding alcohol. Therefore the new type of photoinduced damage occurs inside cells. Intercalating photosensitizers with an attached hydroperoxide group might represent a novel and versatile class of DNA damaging agents, e.g. for phototherapy

Comparison between hysteresis and space vector PWM of shunt active power filter based on prediction harmonic current extraction

This article is available (Open Access) to view at: http://www.globalcis.org/dl/citation.html?id=JNIT-320Harmonic distortion is the most power quality problem. The harmonic problems in the power supply are caused by non-linear loads. Many researches have been done to mitigate harmonics. This paper presents a shunt active power filter with prediction harmonic current extraction technique using Hysteresis Pulse Width Modulation (HPWM) and Space vector Pulse Width Modulation(SVPWM) for power conditioning in distribution systems