This paper describes an improved procedure and simple and green method for the efficient and facile synthesis of 3,4-dihydropyrimidinones with excellent yields using inexpensive heteropolyacid catalyst in the presence of green solvent.

In this paper, we prove a common tripled fixed point theorem for Jungck type mappings in G-metric spaces. We give an example to illustrate our result.Keywords: G-metric space, Jungck type maps, tripled fixed point, W*-compatible maps..MSC: 54H25, 47H10.

Pharmaceutical counterfeiting is becoming a serious problem all over the world. This paper presents several of the most important methods used to elucidate this problem including near- and mid-infrared spectroscopy, Raman spectroscopy, isotopic characterization, chromatographic and mass spectrometric approaches.  Key Words:…

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The inhibition effect of a new synthesized Schiff base, namely 4-nitro-2-methoxy phenyl- N-salicylidine on the corrosion of mild steel in 0.5 M HCl acid have been investigated at room temperature using electrochemical impedance spectroscopy(EIS), Tafel polarization and weight loss measurements.…

The forensic examination and dating of documents is important in our society, because documents are used throughout our lives to record everything we do. The analysis of questioned documents therefore involves different types of analysis including comparison of the handwriting,…

In this note, we  investigate extensions of Baer and principally projective modules. Let  R be an arbitrary ring with identity and M a right R-module. For an abelian module M, we show that M is Baer (resp. principally projective) if…

The existence of missing observation in the data collected particularly in different fields of study cause researchers to make incorrect decisions at analysis stage and in generalizations of the results. Problems and solutions which are possible to be encountered at…

This paper presents a novel topology for cascaded multilevel inverters that only two flying capacitors apply single DC source voltage to all sub-multilevel inverters. The output voltages of each sub-multilevel inverters unit, which each unit can produce five voltage levels,…

Solid state transformers (SST) are used to perform typical functions and improve power quality in series operation of three-phase power systems. Generally, current harmonics and unbalances and neutral wire current are generated due to nonlinear, unbalance load and supply voltage…