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Mohammad Bagher Nasiri,Masoud Behzadinejad,Hamidreza Latifi,Jukka Martikainen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
Arc efficiency of Gas Tungsten Arc Welding (GTAW) was determined by calorimetric method. A water-cooled anode calorimeterwas designed and manufactured to measure the arc thermal efficiency, which was determined as a function of current, arc length, polarityand gas flow rate for GTAW of mild steel. With Direct Current Electrode Negative (DCEN) polarity and 5 mm arc length, a thermalefficiency of 67±4% was obtained, which was independent of the welding current. With Direct Current Electrode Positive (DCEP) polarityand 5 mm arc length, arc thermal efficiency was determined as 52±4%. The experimental data show that the arc efficiency decreasesfrom 67% to 58% and 51% as the arc length increases from 5 mm to 11 and 17.5 mm, respectively. The experimental results also showthat the arc efficiency is not significantly affected by the shielding gas flow rate.
Plasmonic Surface Lattice Resonances at the Strong Coupling Regime
Vä,kevä,inen, A. I.,Moerland, R. J.,Rekola, H. T.,Eskelinen, A.-P.,Martikainen, J.-P.,Kim, D.-H.,Tö,rmä,, P. American Chemical Society 2014 NANO LETTERS Vol.14 No.4
<P>We show strong coupling involving three different types of resonances in plasmonic nanoarrays: surface lattice resonances (SLRs), localized surface plasmon resonances on single nanoparticles, and excitations of organic dye molecules. The measured transmission spectra show splittings that depend on the molecule concentration. The results are analyzed using finite-difference time-domain simulations, a coupled-dipole approximation, coupled-modes models, and Fano theory. The delocalized nature of the collective SLR modes suggests that in the strong coupling regime molecules near distant nanoparticles are coherently coupled.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-4/nl4035219/production/images/medium/nl-2013-035219_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl4035219'>ACS Electronic Supporting Info</A></P>