OBJECTIVES The objective was to quantify the blue-light hazard from CO(2) arc welding of mild steel. METHODS The spectral radiance of arcs in CO(2) arc welding of mild steel was measured for solid and flux-cored wires at welding currents of 120-480 A. Effective blue-light radiance and the maximum acceptable exposure duration were calculated from the spectral radiance using their definitions i...

The stability of electric arc discharges has been explored through the use of an energy balance coupled with charge conservation. In order to facilitate this analysis, a new model for the electrical conductivity function has been proposed. Asymptotic solutions for the arc governing equations have been obtained. Stability criteria have been developed from both the linear theory (infinitesimal si...

The arc-factored model is the simplest graph-based model for dependency parsing, a model that factorizes the scoring function in terms of subgraphs of the dependency tree. The arc-factored model is often referred to as a first-order model, because it decomposes the score of a tree into the scores of one arc at a time. From a linguistic point of view, this is a rather drastic assumption, similar...

The present worldwide study of 31 off-shore back-arc basins and subbasins (BABs) identifies their principal characteristics based on a broad spectrum geophysical subduction-related parameters. This synthesis is next used to identify trends in evolution the for improving our understanding subduction systems general. analysis, plate configuration, demonstrates that fate are essentially controlled...

thirty four patients with rheumatic fever arc studied on ward ;} of pahlavi hospital with a view to finding out their serum enzyme levels. five cases had obvious rheumatic carditis who showed raised sgot and serum aldolase. the cases with minimal evidence of carditis, clinic.ally or eicctrocani•iographi., cally, had only slight! serum enzyme elevation