نتایج جستجو برای: apf

تعداد نتایج: 790  

2013
S. Nagaraju Sudarshan Reddy

A current source converter (CSC) based shunt active power filter (APF) system is designed and implemented to suppress the amplification of low order harmonics at the medium voltage (MV) interface bus between the distribution and transmission systems. Four CSC based APF modules designed at 1.0 Kv are operated in parallel, and connected to the 31.5 kV MV bus via a specially designed coupling tran...

2012
Naresh Kumar Prabhat Kumar

In this paper presents control method for hybrid active filter using space vector pulse width modulation (SVPWM). In the proposed control method, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. A MATLAB code is developed to generate the SVPWM switching pulses fed to the two-level inve...

2014
S. Narasimha M. Sushama

This paper main intents to present a flying capacitor multilevel inverter based shunt active power filter(APF) with Sigma-Delta modulation. A multilevel Sigma-Delta modulation(SDM) control can be applied to control power section of APF intention to reducing sensitivity to flying capacitor voltage deregulation and mending modulator performance. In these control section of APF perfect harmonic ca...

2001
Dahai Xu Chunming Qiao

A major challenge in shared path protection is to select a jointly optimized pair of active and backup paths. While Integer Linear Programming (ILP) based approaches are notoriously time consuming, existing heuristics such as active path first (APF) can only achieve sub-optimal results. In this paper, we propose a novel heuristic called APF with potential backup cost or APF-PBC under the distri...

E Ghasemi, L Pishevar, N Keyhanifard, R Mazaheri,

  Objective: Probable effect of fluoride containing materials like APF on sealants is very important. The purpose of this study is to assess the effect of frequent application of APF (1.23%) on the surface microhardness of two fissure sealants and one flowable composite.   Methods: In this experimental study, 81 specimens of two fissure sealants and one flowable composite were prepared, using s...

In this paper, a novel control strategy for a Shunt Active Power Filter (shunt-APF) is proposed. In the proposed control strategy which is based on a new application of the instantaneous reactive power theory, the current injected by the shunt-APF is capable of compensation for the reactive component, the harmonic components and also unbalance of the load current. In this strategy, the shunt-AP...

Journal: :Pediatric dentistry 2003
Gary H Westerman Randall W Ellis Mark A Latta G Lynn Powell

PURPOSE The purpose of this in vitro study was to evaluate the effect of low-fluence argon laser (AL) irradiation and acidulated phosphate fluoride (APF) gel treatment on enamel microhardness. METHODS Twelve mandibular permanent molars were selected for this study. The teeth were sectioned generating 4 flat enamel surfaces per tooth. The flattened enamel tooth surfaces were randomly assigned ...

2017
Matthew Zirwas Hershel E. Dobkin Smita Krishnamurthy

APF: amicrobial pustulosis of the folds IBD: inflammatory bowel disease IFN-a: interferon-a PPP: palmoplantar pustulosis TNF-a: tumor necrosis factor-a INTRODUCTION Amicrobial pustulosis of the folds (APF) and palmoplantar pustulosis (PPP) are 2 rare autoinflammatory neutrophilic dermatoses. Many studies report PPP triggered by treatment of inflammatory bowel disease (IBD) with tumor necrosis f...

Journal: :Brazilian dental journal 2009
Rita Sarmiento Villena Livia Maria Andaló Tenuta Jaime Aparecido Cury

This in situ crossover and blind study was conducted to investigate the effect of professional acidulated phosphate fluoride (APF) gel application time on the subsequent inhibition of enamel demineralization. During 3 phases of 28 days each, 15 volunteers wore palatal appliances containing 4 enamel blocks, which were subjected to 3 treatment groups: not treated (control) and pre-treated with AP...

Journal: :The Journal of urology 2004
Susan K Keay Zoltan Szekely Thomas P Conrads Timothy D Veenstra Joseph J Barchi Chen-Ou Zhang Kristopher R Koch Christopher J Michejda

Approximately 1 million people in the United States suffer from interstitial cystitis, a chronic painful urinary bladder disorder characterized by thinning or ulceration of the bladder epithelial lining; its etiology is unknown. We have identified a glycosylated frizzled-related peptide inhibitor of cell proliferation that is secreted specifically by bladder epithelial cells from patients with ...

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