Spatial model selection strategies in a SUR framework. The case of regional productivity in EU

The purpose of the paper was to compare two well-known model selection strategies, the so-called Specific-to-General, Stge, and General-to-Specific, Gets, in a context of spatial SUR models. The two strategies use a battery of misspecification tests obtained in a maximum likelihood framework. The robust tests to local misspecification errors in the alternative hypothesis and the common factor test have been developed with this purpose. The paper includes a Monte Carlo experiment to compare their performance in a situation of small sample sizes. The results are mixed: Both alternatives work well under ideal conditions, but their efficiency deteriorates for different departures such as non-normality or endogeneity. All in all, Stge appears to be slightly preferable although our impression is that the two are complementary and can be used in common. The paper finishes with an application to the case of productivity for a large set of European regions.     

Development of method to improve efficiency of residual current device under 1000 V on excavators of mining enterprises

This article presents the results of experimental studies on a coal mine. According to the results, the current of single phase-to-earth fault in the network under 1000 V has a value less than the current of the residual current device set point. This article presents a method aimed to improving the efficiency of the residual current device used on excavators and drill-rings at mining enterprises. Indeed, the method developed to improve the efficiency of residual current devices under 1000 V is based on setting up a direct current into three-phase mains with a fixed set-point of protection against any phase-to-ground insulation damage, where electric equipment is switched off due to increases of capacitance between a conductor and earth when live-line bare-hand touching of electric equipment occurs.     

The Effects of Annealing After Equal Channel Angular Extrusion (ECAE) on Mechanical and Magnetic Properties of 49Fe-49Co-2V Alloy

Metallurgical and Materials Transactions A - Equal channel angular extrusion (ECAE) of 49Fe-49Co-2V, also known as Hiperco® 50A or Permendur-2V, greatly improves the strength and ductility of...     

Recycling of Nickel-Slag Tailings into Liquid Products: A Case Study using Slag from the Southern Urals Nickel Plant

Metallurgist - We provide an overview of the current status of research on reprocessing of nickel waste tailings, describe the current condition of the tailings, and set forth an important economic...     

Sintering and Briquetting Synergy in Blast Furnace Smelting

Metallurgist - The article describes the concept of partially replacing the sinter in a blast furnace charge with extrusion briquettes to form the basis for sintering and briquetting synergy. The...     

Power Supply at Metallurgical Iron-and-Steel Works: Features and Development Prospects

Metallurgist - The article provides a brief assessment of the current state of power supply units at metallurgical plants and prospects for their future development. The principal power-supply...     

Remelting of Iron Shavings with the Synergistic Effect of Minimum Metal Loss

Metallurgist - The well-known technologies of remelting iron shavings lead to significant (30%) losses of metal. An electroslag smelting furnace with graphite electrodes is proposed for remelting...     

Combustion in Ni–Al System with Cu Additive (Powder or Rod). Experiment and Mathematical Model

Russian Journal of Non-Ferrous Metals - Experimental studies have been carried out with theoretical calculations of wave synthesis in the Ni–Al–Cu system using a mathematical model....     

Ensuring Strength in Laser Welds Made Using the Dispersion-Hardened EP693 Nickel Alloy

Russian Journal of Non-Ferrous Metals - The process of making a weld using the heat-resistant EP693 alloy (Ni–Cr–W–Co–Co–Mo system) to make assemblies and components...     

Grain Refinement of Casting Aluminum Alloys of the Al–Mg–Si System by Processing the Liquid Phase Using Nanosecond Electromagnetic Pulses

Russian Journal of Non-Ferrous Metals - In this paper, using the AA 511 alloy of the Al–Mg–Si system as an example, it is shown that the irradiation of aluminum melts with nanosecond...