in this research, mechanical alloying was used to synthesize ultrafine grained aa2024 and aa2024-b4c powders in an attrition mill under argon atmosphere up to 50 h with the rotational speed of 400 rpm. in order to determine the grain size of the matrix, x-ray diffraction test and williamson–hall method was used. after mechanical alloying, hot pressing and hot extrusion were used for densificati...

The purpose of this study is preparation polyaniline–lead ferrite, polyaniline–cobalt ferrite and polyaniline/nickel thin layers. electromagnetic pollution a serious problem in the world that can be solved by interference (EMI) shielding. EMI layers synthesized conductive layer composed magnetic particles. Crystallite size samples was studied (XRD) analyze via Debye–Scherrer Williamson–Hall equ...

Previous research has demonstrated that the speech of psychopaths is more disorganized than that of nonpsychopaths ðWilliamson\ S[ E[ "0880#[ Cohesion and coherence in the speech of psychopathic criminals[ Unpublished doctoral dissertation\ University of British ColombiaŁ[ This paper attempts to explain Wil! liamson|s _ndings and examines the speci_c hypotheses that "a# psychopaths are poor at ...

X-ray diffraction analysis is one of powerful tools on the dislocation and this method can be applied reasonably for many metals with isotropic crystal structure such as bcc fcc. In study, modified Williamson-Hall was martensitic steels containing 0.006 – 0.26 mass% carbon proved that value density increases increasing content. However, solute have bct characterized by different lattice constan...

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...

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We propose a novel theory of self-fulfilling fluctuations in the labor market. A firm employing an additional worker generates positive externalities on other firms, because employed workers have more income to spend and have less time to shop for low prices than unemployed workers. We quantify these shopping externalities and show that they are sufficiently strong to create strategic complemen...

This paper reports the correlation between film thickness, nanostructure and DC electrical properties of copper thin films deposited by PVD method on glass substrate. X-ray diffraction (XRD) and atomic force microscopy (AFM) were used for crystallography and morphology investigation, respectively. Resistivity was measured by four point probe instrument, while a Hall effects measurement system w...

although cu and fe are immiscible under equilibrium conditions, they can form supersaturated solid solutions by mechanical alloying. in this paper, nano-structured of the metastable cu-fe phase containing 10, 15, 20 and 25% wt fe were synthesized by intensive ball milling for 15h, in order to achieve a solid solution of fe in cu. the phase composition, dissolution of the fe atoms into the cu ma...