A counterintuitive gauge-dependence of NMR shieldings for rare-gas dimers is presented and analyzed. It is shown that common belief about the existence of a natural gauge-origin for spherical atoms with respect to NMR shielding calculations is wrong.

In mechanized or automatic GMAW welding, when necessary, weaving is usually performed by mechanical devices. On the other hand, magnetic fields are commonly used for same purpose in GTA welding. Experiments were carried out using with short-circuit, and pulsed metal transfer which controlled oscillation was applied. A clear influence of imposed field on process stability observed, its effect as...

Abstract A three-dimensional numerical model based on the volume-of-fluid (VOF) method is typically preferred for studying high-current gas metal arc welding (GMAW) transfer mechanism and then controlling it. It informed that rotating spray extremely complicated, some researchers have focused simplified models without considering energy conservation to make analysis manageable unstable process....

This paper presents the spatial characterization of Ar-N2 plasma induced by a helical cavity excited at 27 MHz and moderated pressure (400 Pa). The axial profiles of densities and gas temperature are determined through the emissions of the first positive (1) and second positive (2) systems of N2. Additionally, in case of pure argon plasma, the OH(AΣ→XΠ) emission system coming from impurities is...

Dielectric breakdown strength is one of the critical performance metrics for gases and mixtures used in large, high pressure gas time projection chambers. In this paper we experimentally study dielectric strengths several important chamber working gas-phase insulators over range 100 mbar to 10 bar, gap sizes ranging from 0.1to mm. Gases characterized include argon, xenon, CO2, CF4, 90-10 argon-...

Unstable mold flow could induce surface velocity and level fluctuations, and entrain slag, leading to surface defects during continuous casting of steel. Both argon gas injection and ElectroMagnetic Braking (EMBr) greatly affect transient mold flow and stability. Part I of this two-part article investigates transient flow of steel and argon in the nozzle and mold during nominally steady-state c...

Hartree-Fock (HF) and Density Functional Theory (DFT) methods employed to study the effect of conformational change on the 13C chemical shifts of 6-mono axial and equatorial substituted and 6,7-di axial-axial, equatorial-equatorial and axial-equatorial substitutedderivatives of 5,6,7,8-tetrahydrodibenzo[a,c]cyclo-octene. The geometry of the conformers have been optimized...

The effect of repeated repair welding, shielded with argon, on microstructural properties, corrosion resistance, and dry sliding wear behavior of aluminum alloy 5083/H116 were investigated. Samples were welded by metal inert gas welding method. 100% argon was used to protect fusion zone. Aluminum alloy 5356 was used as the filler metal. The samples for microstructure, corrosion, and wear tests ...

INTRODUCTION is attributable to the parietal distribution of the vacuoles within the cells of the particular strain of blue-green alga used in these experiments . Gas vacuoles are small, cylindrical, gas-filled vesicles which occur in certain procaryotic cells . They are found in numerous blue-green algae, many photosynthetic bacteria, some halophilic bacteria, and some planktonic freshwater ba...