in this research, kinetics of carbothermic reduction of molybdenite in the presence of different amounts of sodium carbonate has been studied. mixed powders consisting of molybdenite, graphite and sodium carbonate with three mole-ratios of 1:4:2,1:4:3 and 1:4:4 were mechanically activated for 40 hours. the results of x-ray diffraction on activated samples showed that no reaction occurrs in diff...

Fall Winter 2012, Vol. 22, Number 1 Page 36 L style theories have been cited as an effective means for helping teachers recognize the incredibly diverse needs students bring into the classroom (Felder & Brent, 2005; Hall & Mosely, 2005; Sternberg, Grigorenko, & Zhang, 2008; Williamson & Watson, 2007). According to Zapalska and Dabb (2002), an understanding of the way students learn improves the...

and the assembly of Gondwana 3 Laura C. Gregory, Joseph G. Meert, Bernard Bingen, Manoj K. Pandit, 4 and Trond H. Torsvik 5 6 Department of Geological Sciences, University of Florida, 241 Williamson Hall, 7 Gainesville, FL 32611 8 Geological Survey of Norway, N-7491, Trondheim, Norway 9 Department of Geology, University of Rajasthan, Jaipur, 302004, Rajasthan, India 10 4 PGP, University of Oslo...

This paper presents the characterization of a secondary cone crusher concave liner made Hadfield steel used in Chilean mining after crushing copper minerals during all service life. During use, suffers indentation (cold working) and abrasion; this combination provides with layer that constantly renews itself, maintaining surface highly resistant to abrasive wear. The results presented here were...

In the present work, pure and Cr-doped MoO3 microrods were successfully prepared through sol gel auto combustion method. The phase evaluation microstructural, dielectric, optical properties of synthesized samples investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), an impedance analyzer (1 MHz–3 GHz). All showed hexagonal struc...

In this work we apply the recently proposed Unified Particle Swarm Optimization (UPSO) method to the search for Hadamard matrices of the Williamson type. The objective functions that arise from the classical Williamson construction, are ideally suited for UPSO algorithms. This is the first time that swarm intelligence methods are applied to this problem. Mathematics Subject Classification (2000...

scanning hall probe microscopy (shpm) is a scanning probe microscopy technique developed to observe and image magnetic fields locally. this method is based on application of the hall effect, supplied by a micro hall probe attached to the end of cantilever as a sensor.  shpm provides direct quantitative information on the magnetic state of a material and can also image magnetic induction under a...

We successfully synthesized Cu/Cu2O nanocomposites using the wet chemical synthesis method. All X-ray diffraction (XRD), Reference Intensity Ratio (RIR), and Rietveld refinement methods confirmed that compounds Cu Cu2O are free of impurities. Scanning Electron Microscope (SEM) Transmission electron microscopy (TEM) images show morphology interactions in structure. The formation mechanism is als...