Quasi-z-source inverter for photovoltaic power gene ration systems

The Z-Source Inverter (ZSI) has been reported suitable for res idential PV system because of the capability of voltage boost and inversion in a single stage. Recently, four new topol ogies, the quasi-Z-Source Inverters (qZSI), have been derived from the original ZSI. This project ana lyzes one voltage fed topology of these four in detail and applies it to PV power generation systems. By using the new quasi-Z-Source topology, the inverter draws a constant current from the PV array and is capabl e of handling a wide input voltage range. It also features lower component ratings and reduced source stress compared to the traditional ZSI. A prototype which provides three phase 50-Hz, 230Vrms ac has been built in laboratory . It is demonstrated from the theoretical analysis and MATLAB/SIMULATION results that t he proposed qZSI can realize voltage buck or boost and dc-ac inversion in a single stage with high reliability and efficiency, which makes it well suited for PV power systems

Visualizing the air traps as function of fill velocity in casting: a CFD based case study

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HARMONICS REDUCTION WITH Id-Iq CONTROL STRATEGY USING FUZZY LOGIC CONTROLLER BASED THREE PHASE SHUNT ACTIVE POWER FILTER

Shunt active power filters found the application in elimination of current harmonics in power system. The performance of such filter depends upon various factors like control methods, inverter used, and reference current generation technique. In this paper the authors have implemented fuzzy logic control technique for generation of pulses of the three phase inverter. Harmonic extraction is mainly achieved by a band pass filter in synchronous reference frame algorithm (SRF) or Id-Iq theory. The performance of the shunt active power filter is evaluated with MATLAB/ SIMULINK under balanced voltage conditions. After evaluation authors have found that the harmonic elimination is achieved satisfactorily

FUZZY LOGIC CONTROLLER BASED THREE PHASE SHUNT ACTIVE POWER FILTER FOR HARMONICS REDUCTION WITH ID-IQ CONTROL STRATEGY

For the elimination of current harmonic in power system, Shunt active power filter is a complete current source. Its performance depends on the topology of inverter used in the design, control technique, and strategy employed in reference current generation. In this study, fuzzy logic cu rrent control technique is used for generatio n of pulses of the three phase inverter. A band pass filter is mainly required in synchronous reference frame algorithm (SRF) or Id-Iq theory for harmonics extraction. Under balanced voltage co ndition the sh unt active power filter performance is evaluated with MATLAB/SIMULINK. The result are good and gives satisfacto ry response in elimination of the harmonics

IMPROVEMENT OF POWER-QUALITY BY USING A VOLTAGE-CONTROLLED DSTATCOM

This Project proposes a new algorithm to generate r eference voltage for a distribution static compensa tor (DSTATCOM) operating in voltage-control mode. The p roposed scheme exhibits several advantages compared to traditional voltage-controlled DSTATCOM where the r eference voltage is arbitrarily taken as1.0 p .u. T he proposed scheme ensures that unity power factor (UPF) is ach ieved at the load terminal during nominal operation,which is not possible in the traditional method. Also,the compe nsator injects lower currents and,therefore,reduc es losses in the feeder and voltage-source inverter. Further,a savi ng in the rating of DSTATCOM is achieved which incr eases its capacity to mitigate voltage sag. Nearly UPF is mai ntained,while regulating voltage at the load termi nal,during load change. The state-space model of DSTATCOM is incorp orated with the deadbeat predictive controller for fast load voltage regulation during voltage disturbances. The state-space model of DSTATCOM is incorporated with the deadbeat predictive controller for fast load voltag e regulation during voltage disturbances. With thes e features,this scheme allows DSTATCOM to tackle power-quality issu es by providing power factor correction,harmonic elimination,load balancing,and voltage regulation based on the load requirement. Simulation and expe rimental results are presented to demonstrate the efficacy of the pr oposed algorithm https://www.ijiert.org/paper-details?paper_id=14044

Metal-Based Anticancer Agents: In vitro DNA Binding, Cleavage and Cytotoxicity

Two new metal-based anticancer chemotherapeutic agents, [(Ph2Sn)2(HGuO)2(phen)Cl2] 1 and [(Ph3Sn)(HGuO)(phen)]- Cl.CH3OH.H2O 2, were designed, prepared and characterized by analytical and spectral (IR, ESI-Mass, 1H, 13C and 119Sn NMR) techniques. The proposed geometry of Sn(IV) in 1 and 2 is distorted octahedral and distorted trigonal-bipyramidal, respectively. Both 1 and 2 exhibit potential cytotoxicity in vitro against MCF-7, HepG-2 and DU-145 cell lines. The intrinsic binding constant (Kb) values of 1 (2.33 × 105 M-1) and 2 (2.46 × 105 M-1) evaluated from UV-Visible absorption studies suggest non-classical electrostatic mode of interaction via phosphate backbone of DNA double helix. The Stern-Volmer quenching constant (Ksv) of 1 (9.74 × 105 M-1) and 2 (2.9 × 106 M-1) determined by fluorescence studies suggests the groove binding and intercalation mode for 1 and 2, respectively. Effective cleavage of pBR322 DNA is induced by 1. Their interaction with DNA of cancer cells may account for potency

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Not Available: Isolation of high quality, intact high molecular weight genomic DNA from plants which are rich in polysaccharides, polyphenols, secondary metabolites and chemical heterogeneity is an immense problem in the field of plant biology. Several protocols have been developed for eliminating these tricky elements during the extraction of DNA, but none is found to be universally applicable. The purpose of the present study was to develop a reliable protocol for extracting high quality genomic DNA from polyphenols, polysaccharides and secondary metabolites rich plants like sweet sorghum. We made seven critical modifications to the available CTAB method to isolate genomic DNA from 25- and 60-d-old transgenic sweet sorghum leaf tissues. The yield of DNA ranged from 9.2– 10.2 µg from 200 mg of leaf tissue. An absorbance value of 1.8 at A260/A280 indicates that it’s free from RNA and protein contamination. PCR analysis using bar primers shows a consistent and reliable amplification product at 475 bp. This method is highly suitable for extracting high quality genomic DNA from plants with high levels of polysaccharides and polyphenolics without blending commercial kits. Our protocol facilitates the processing of large number of plant samples for genomic analysis, mapping and next generation sequencing.Not Availabl

A Simple and Efficient Method for High Quality DNA Extraction from Sweet Sorghum [Sorghum bicolor (L.) Moench]

Not AvailableIsolation of high quality, intact high molecular weight genomic DNA from plants which are rich in polysaccharides, polyphenols, secondary metabolites and chemical heterogeneity is an immense problem in the field of plant biology. Several protocols have been developed for eliminating these tricky elements during the extraction of DNA, but none is found to be universally applicable. The purpose of the present study was to develop a reliable protocol for extracting high quality genomic DNA from polyphenols, polysaccharides and secondary metabolites rich plants like sweet sorghum. We made seven critical modifications to the available CTAB method to isolate genomic DNA from 25- and 60-d-old transgenic sweet sorghum leaf tissues. The yield of DNA ranged from 9.2– 10.2 µg from 200 mg of leaf tissue. An absorbance value of 1.8 at A260/A280 indicates that it’s free from RNA and protein contamination. PCR analysis using bar primers shows a consistent and reliable amplification product at 475 bp. This method is highly suitable for extracting high quality genomic DNA from plants with high levels of polysaccharides and polyphenolics without blending commercial kits. Our protocol facilitates the processing of large number of plant samples for genomic analysis, mapping and next generation sequencing.Not Availabl