Over the past decade both labor and multifactor productivity have fallen in copper, iron ore, coal, and many other mining operations, causing production costs to rise. This decline, following years of rising productivity, has led many to conclude that new technology can no longer offset the adverse effects of resource depletion. As a result, real mineral commodity prices will be permanently hig...

In the area where the high quality water is not available, unconventional water sources are used to irrigate. Household leachate is one of the sources which are used in dry and semi dry areas in order to water the barer trees and plants. It meets the plants needs and also has some effects on the soil, but at the same time it might cause some problems as well. This study in order to evaluate the...

and Applied Analysis 3 vector spaces X and Y is a solution of 1.5 if and only if there exists a unique function C : X × X × X → Y such that f x C x, x, x for all x ∈ X, and C is symmetric for each fixed one variable and is additive for fixed two variables see also 20 . The quartic functional equation 1.6 was introduced by Rassias 21 in 2000 and then in 2005 was employed by Park and Bae 22 and o...

Abstract In order to investigate the influence of surface-active element on interfacial phenomena between molten iron and Al 2 O 3 -CaO-SiO slag, a mildly element, nitrogen, was introduced, were directly observed using an X-ray sessile drop method. The multiphysics model employed calculate velocity Marangoni convection caused by surface/interfacial tension gradient along with contour drop. Move...

In the electrical machines, operated in railway traction drives, the growth of power density requires overproportional more heat to be discharged which leads to the need for more and more advanced cooling techniques. A novel optimization and evaluation approach for internal air cooled traction machines will be presented in this paper. It analyses and investigates the thermo-aeroand thermodynami...

Last year, iron was reported to become superconducting at temperatures below 2K and pressures between 15 and 30 GPa [1]. The evidence presented was a weak resistivity drop, suppressed by a magnetic field above 0.2 T, and a small Meissner signal. However, a compelling demonstration, such as the occurrence of zero resistance, was lacking. Here we report the measurement of a complete resistive tra...

Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00" (2012). US Department of Energy Publications. Paper 347. Magnetic and structural transitions in the iron-chalcogenide high-T c 57 Fe Mössbauer spectroscopy was used to study single-crystals of K 0.8 Fe 1.76 Se 2.00 from 6 K to 673 K. At 6 K, the hyperfine field (B hf) is canted away from the c...

We present a successive microfluidic approach to create and characterize hierarchical catalyst structures consisting of metal-decorated nanoparticles that are assembled into porous microparticles ("supraball" catalysts). First, using a silicon microreactor, platinum nanoparticles with a very narrow size distribution are grown and immobilized uniformly onto iron oxide/silica core-shell nanospher...