Journal of Mining and Mechanical Engineering

Abstract SiC particles with 8wt.% magnesium alloy powders as additives were mixed followed by annealing at 280 and 400 ℃ for 1 and 4 h. The particle size, phase condition, morphology and compositions distribution were analyzed using laser diffraction analyzer, X-ray diffraction (XRD), scanning electron microscopy (SEM). It was found that particles mixed homogeneously before annealing. Annealing processes have a positive effect on the decrease of magnesium alloy particle size. It has almost no effect on magnesium alloy particle size with increasing the annealing duration at 280 ℃. However, the diameter of magnesium particle decreased obviously with increasing the annealing duration at 400 ℃. Magnesium alloy particles annealed at 400 ℃ is smaller than that of the 280 ℃ ones under the same annealing duration. Si component was observed in powder annealed at both temperatures. Grain size of SiC was reduced and microstrain was improved with increase of annealing temperatu

Abstract Field and petrological data of metakomatiite, eastern and western metabasalts and metadacite were used to propose an intraoceanic or intracontinental provenance for the Neoarchean Mundo Novo Greenstone Belt (MNGB), eastern São Francisco Craton. Despite deformation, the metakomatiite preserves the spinifex texture and the eastern metabasalt’s pillow lava structure. The metavolcanics are recovered by an ocean floor lithological association composed of chemical metasedimentary rocks and the western metabasalt hosts ocean floor hydrothermal alteration zones. The eastern metabasalt plots in the IAT and MORB fields and western metabasalt is mainly in the MORB field in the Zr vs. Zr/Y diagram, suggesting nearby oceanic settings. Heterogeneous crustal assimilation and metamorphism during the Rhyacian-Orosirian explain the mineralogical differences between the two metabasalts. The metakomatiite and metabasalts feature a vector from the MORB-OIB array to the volcanic

Abstract In the first and second decades of the 21st century nanotechnology has given impetus to a new generation of materials namely smart materials. Having the abilities to transform in shape, to sense and correspond to external stimuli like temperature, pressure, sound, etc. and to counteract these, they excited the engineers into many new concepts like adaptive structures in aeronautics, active biomaterials and smart self-healing composite materials. This scheme was corroborated by the parallel progress in nanotechnology, as well as a real explosion in the additive manufacturing technologies, which enabled many types of sensors and smart or responsive nanomaterials to be incorporated into structural parts. This mini review paper provides an opinion on these new conceptual technologies such as 4D printing into the oncoming third decade of the century which has already been characterized as the era of nano - and bio- engineering. Introduction The be

Abstract The model structure of the coordinated systems under the name of concrete-mixed beam structures using ANSYS 12.0 software was designed in 3D. Concrete mixture was selected as the element type of the model structure. Model prototype was created by measuring distance dependent with 16 coordinate points. Mesh segmentation was applied to the 3D concrete mixed beam model and 75 N/mm 2 load and 32.174ft / sec 2 acceleration motion were applied to the carrier systems. In the results of the application, global directional changes between the model groups were examined. As a result of the global investigations, ANSYS software has determined that the mechanical improvements should be at the joints where the beams connected to the axes and the concrete bases meet.   Read more about this article : https://lupinepublishers.com/mining-mechanical-engineerning/fulltext/investigation-axial-global-directional-in-ansys-software-of-concrete-mixed-beam-structures.ID.000103.php Read m

Abstract The recycling of Inert CDW in new concretes remains problematic. Only a part of this material can be used to substitute coarse aggregates in new concretes, mainly the liberated coarse aggregates from demolished concretes. This paper presents the processing of Inert CDW in air jigs aiming at concentrates with high concrete particle contents. The paper compares different studies carried out with laboratory air jigs aiming at a concentration of concrete particles, which can partially substitute coarse aggregates in new concretes. Introduction Nowadays, large quantities of CDW (Construction and Demolition Waste) are produced worldwide: European Union between 310 and 700 million tons [1], United States 145 million tons [2], China about 1 billion tons [3], etc. In Europe, this waste represents over 30% of all solid waste generated [1]. Current CDW processing plants only separate light materials (such as plastics, paper, wood, etc.) and metal parts (fe