Journal of Mining and Mechanical Engineering

Abstract The existence and uniqueness of the solutions to an infinite system of nonlinear equations arising in the  dynamic analysis of large deflection of a plate are discussed. Under the assumption that the rim of the plate is prevented from inplane motions, explicit equation for the coupling parameter is given. Keywords: Existence, uniqueness, Berger’s method.1991 Mathematics Subject Classification. 46(Functional analysis),73(Mechanics of solids) Introduction In the analysis of classical mechanics problems, there are cases where linear mathematical model can not fully describe the phenomena. If the deflection of the plate is of order of magnitude of its thickness, the differential equations for the deflection and displacements can be written in terms of nonlinear equations. These nonlinear equations are usually difficult to obtain the solution. Thus several attempts have been tried to obviate the difficulties. Among these attempts, it was Berger’s...

    We  deeply appreciate your trust and loyalty towards Journal of Mining and Mechanical Engineering  and we wishing you  a very happy and healthy Thanksgiving Day!! 

  Abstract 3D printing is effective to manufacture experimental models widely used in analogous statics tests before practical engineering applications. Whereas, traditional statics model experiments with strict dimensionless function are hardly to be established through 3D printing items according to similarity theory. To find a solution, this paper theoretically simplifies the statics system based on reducing constrains of weight and Poisson’s ratio. This simplification is the core of a new method of additional weight and correction to identify the simplified and the original statics systems. Operation procedures are displayed through case studies using the new method. 3D printed materials for specific statics experiments are validated as well through coefficient corrections. The results will finally contribute to 3D printing technology applied to analogic static research, for not only academic but also industrial purposes.   Read more about this article : ht...

Short Communication Mechanical engineering is not only one of the oldest engineering disciplines but also the broadest one, i.e., with the wide-scope as well as a large number of its branches. This engineering discipline requires a clear understanding of the principles of engineering physics, engineering mathematics, and materials science to design, analyze, manufacture, and maintain mechanical systems such as mechanisms, devices, and machines. With a view to machines’ development, the progress of mechanical engineering advancement is often directly related to the course of civilization history. Therefore, it can be studied from many perspectives. Our attention often directs to significant particular forms or stages of civilization, which arisen throughout human history. One cannot forget about ancient cultures, both Greco-Roman (in Europe) and Chinese (in Asia), which adopted to a great extent and, then, developed often anonymous technical achievements of the fi...

  Abstract In this study, the spoiler effect in a different angle of attacks that makes the maximum downforce is conveyed. Two different facilities are utilized to set up the experiment. A wind tunnel is used to measure the downforce and drag force, and a water tunnel is used to observe the velocity profile and flow field visualization. The result revealed that a 12° angle of attack is the optimal angle for designing the spoiler. Twelve degrees angle of attack provided the highest downforce. This downforce can improve the stability of high-speed sports car without increasing much drag. Compared to the angle of attack of 5°, the downforce of the angle of attack equal to 12° increases 233%, but the drag force only increases by 15% in wind tunnel experiments.   Read more about this article : https://lupinepublishers.com/mining-mechanical-engineerning/fulltext/experimental-investigation-of-a-spoilers-impact-on-the-flow-pattern-of-a-high-speed-sport-car.ID.000110.p...

  Abstract This Paper presents comparison of syngas compositions, for all coal ranks, as produced from different types of coal gasification processes currently in use, namely entrained flow, fluidized bed, and fixed bed gasifiers. Cold gas and carbon conversion efficiencies were investigated. The syngas composition varies with the applied gasification process. The importance of this research arises from the fact that gasifiers produce the environmentally clean fuel required to run any Integrated Gasification Combined Cycle power system. A procedure was conducted to get estimates for bituminous coal. It is important to have knowledge of the chemical reactions which take place in each gasifier and the raw syngas produced from the specific reaction involved to develop an Integrated Coal Gasification Combined Power Generation plant with CO 2 recovery in order to increase the cycle efficiency and mitigate CO 2 emission and other pollutants. The results indicate that t...

  Abstract E-waste is an emerging problem that has to be attending worldwide. The best way for E-waste management is recycling. Bioleaching is a novel method to extract metals from E-waste. In this research, bioleaching of Cu and Ni from an E-waste sample was examined using acidophil microorganisms. Different kinds of E-waste were purchased; the sample size reduced to lower than 100 microns. Acidithiobacillus ferrooxidans was adapted to the 15 g/l of the E-waste sample. Eh, pH, bacterial count, and metal recovery were followed in a period of 25 days. By using inductively coupled plasma optical emission spectroscopy (ICP-OES) identified Cu and Ni were recovered respectively 99% on 11 th day and 98% on 14 th day. The results of field emission scanning electron microscope (FE-SEM), Fourier transform infrared spectrometer (FTIR), and X-ray diffraction before and after bioleaching emphasize the great efficiencyofbioleaching. Read more about this article :  https:...

Abstract Alkaliphilic bacteria usually grow well at pH 9, and the most extremophilic strains can grow up to values as high as pH 12-13. This group of bacteria has the ability to metabolically reduce alkalinity and are tolerant of high concentrations of ions and metals. Interest in extreme alkaliphiles has been shown as they are sources of useful, stable enzymes, and the cells themselves can be used for biotechnological and other applications at high pH values. Many industrial processes produce highly alkaline waste that is contaminated with toxic trace metals/metalloid. Thus, using alkaliphilic microorganisms is considered an attractive alternative method for treating industrial alkaline residues. Bauxite refining is one of the activities that most produces highly alkaline waste. Alumina extraction from bauxite using concentrated sodium hydroxide in the Bayer process generates a slurry and an extremely alkaline (pH of 9 to 13) by-product known as bauxite residue or r...

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 Re...

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...

Abstract Acid and Metalliferous Drainage (AMD) is a critical environmental problem worldwide. It occurs when sulfide minerals, primarily pyrite, oxidise chemically or biologically to produce acidic wastewater containing elevated concentrations of sulfate and toxic elements. This short paper presents a very brief and general introduction of AMD, with a specific focus on two categories of AMD remediation options including source- and migration-control. Some most recent examples of potentially viable and economically sustainable surface passivation strategies for AMD control at-source are briefly discussed in this review.   Read more about this article : https://lupinepublishers.com/mining-mechanical-engineerning/fulltext/acid-and-metalliferous-drainage-a-global-environmental-issue.ID.000101.php Read more   Lupine Publishers Google Scholar   Articles : https://scholar.google.com/citations?view_op=view_citation&hl=en&user=dtO2BpUAAAAJ&citation_for_view...