Articoli di riviste: "AMMC"

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Ünal, Tennur Gülşen, e Ege Anıl Diler. "Properties of AlSi9Cu3 metal matrix micro and nano composites produced via stir casting". Open Chemistry 16, n. 1 (13 agosto 2018): 726–31. http://dx.doi.org/10.1515/chem-2018-0079.

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AbstractThe effects of micro and nano sized reinforcement particles on microstructure and mechanical properties of aluminium alloy-based metal matrix composites were investigated in this study. AlSi9Cu3 alloy was reinforced with micro and nano sized ceramic reinforcement particles at different weight fractions by using a stir casting method. The mechanical tests (hardness, three point bending) were performed to determine the mechanical properties of AlSi9Cu3 alloy-based microcomposites (AMMCs) and nanocomposites (AMMNCs). The experimental results have shown that the size and weight fraction of reinforcement particles have a strong influence on the microstructure and the mechanical properties of AlSi9Cu3 alloy-based microcomposites and nanocomposites. The relative densities of all AMMC and AMMNC samples are lower than unreinforced AlSi9Cu3 alloy due to porosity formation with the increase of weight fraction of reinforcement particles. As weight fraction increases, hardness values of AMMCs and AMMNCs increase. Maximum flexural strength can be obtained at 3.5wt.% for the AMMC sample with microsized Al2O3 particles and at 2wt.% for the AMMNC sample with nano-sized Al2O3 particles. After the weight fractions exceed these values, flexural strengths of both AMMCs and AMMNCs decrease due to clustering of Al2O3 particles.

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Srivastava, Ashish Kumar, e Rohit Srivastava. "To Investigate Mechanical Properties of Al-based Composite Reinforced with Waste Product". Journal of Futuristic Sciences and Applications 5, n. 2 (2022): 81–89. http://dx.doi.org/10.51976/jfsa.522211.

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The most common use for aluminium metal matrix composite, or AMMC, is variety of industrial submissions, including those in aerospace, automotive, marine, and sports industries, amongst many others. The most important reinforcing components for manufacturing AMMC are SiC, aluminium oxides, MnO, graphene, and carbon nano tubes, since these components are often used in practice. This article’s goal is to build AMMCs that are reinforced with Silicon carbide (SiC) and Alumina (Al2O3). In order to make AMMC, a procedure known as stir casting is used. Since the last several years, increased attention has been placed on the preparation of AMMCs employing agro waste as reinforcing materials. Examples of such waste are rice husk and/or SiC. As soon as the Al-matrix material has been melted using this method and churned violently, reinforcing material is added to one side of this vortex, creating a spherical structure. The AMMCs may be prepared via a procedure called stir casting, which involves a violent and whirling motion. In the beginning, the furnace is used to melt the aluminium alloy (AA3105) when the metal is in a semisolid state. The reinforcing materials, also known as SiC and Alumina (Al2O3), are warmed to temperatures of 260 and 220 degrees Celsius, respectively. According to the findings of AMMC, tensile strength and hardness of material both rose by 22.41 percent and 45.5 percent, respectively, when they were reinforced with 4.75 weight percent of each kind of reinforcement (SiC, Al2O3, and 1 percent Cr). When 1 percent Cr, 4.75 weight percent SiC, and 4.75 weight percent Al2O3 of composite material are used.

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Dr.T.M. Chenthil Jegan, S. Samuel, K.R. Dhandapani, S. Manoj kumar e M. Praveen. "Mechanical Behavior of Aluminum Based Mattel Matrix Composites". International Research Journal on Advanced Engineering Hub (IRJAEH) 2, n. 04 (20 aprile 2024): 880–88. http://dx.doi.org/10.47392/irjaeh.2024.0124.

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The mechanical behavior of aluminum-based metal matrix composites (AMMC) has been a subject of significant research and interest in the field of materials science and engineering. These composites, composed of an aluminum matrix reinforced with other materials, exhibit unique mechanical properties compared to traditional aluminum alloys. This abstract provides a concise overview of the key aspects of the mechanical behavior of AMMC. Fatigue resistance, a critical aspect for materials subjected to cyclic loading, is influenced by the type of reinforcement, particle size, and the matrix-reinforcement interface. Proper dispersion of the reinforcement particles contributes to enhanced fatigue life. AMMCs also demonstrate improved wear resistance compared to the base aluminum alloy, making them suitable for applications where wear is a significant concern. Thermal properties, including thermal conductivity, are influenced by the type and volume fraction of the reinforcement. The processing techniques used, such as powder metallurgy or stir casting, play a crucial role in determining the final mechanical properties of AMMC Understanding the temperature dependence of AMMC is essential, considering their potential applications in diverse environments. Ongoing research in this field aims to further optimize the mechanical behavior of these composites for applications in aerospace, automotive, and structural engineering.

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Santana, Carlos, Luis Reyes-Osorio, Jesus Orona-Hinojos, Lizbeth Huerta, Alfredo Rios e Patricia Zambrano-Robledo. "Numerical Study of Reinforced Aluminum Composites for Steering Knuckles in Last-Mile Electric Vehicles". World Electric Vehicle Journal 15, n. 3 (10 marzo 2024): 109. http://dx.doi.org/10.3390/wevj15030109.

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The steering knuckle is a critical component of the suspension and steering drive systems of electric vehicles. The electrification of last-mile vehicles presents a challenge in terms of cost, driving range and compensation of battery weight. This work presents a numerical methodology to evaluate 60XX series aluminum metal matrix composites (AMMCs) with reinforcement ceramic particles for steering knuckle components in medium heavy-duty last-mile cargo vehicles. The use of AMMCs provides lightweight knuckles with sufficient strength, stiffness and safety conditions for electrical vehicle cargo configurations. The numerical study includes three aluminum alloys, two AMMC alloys and an Al 6061-T6 alloy as reference materials. The medium-duty heavy vehicle class < 12 t, such as electrical vehicle cargo configurations, is considered for the numerical study (class 1–4). The maximum von Mises stress for class 4 AMMC alloys exceeds 350 MPa, limited by fracture toughness. The weight reduction is about 65% when compared with commercial cast iron. Moreover, Al 6061-T6 alloys exhibit stress values surpassing 300 MPa, constraining their suitability for heavier vehicles. The study proposes assessing the feasibility of implementing AMMC alloys in critical components like steering knuckles and suggests solutions to enhance conventional vehicle suspension systems and overcome associated challenges. It aims to serve as a lightweight design guide, offering insights into stress variations with differing load conditions across various cargo vehicles.

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Sunil Kumar Reddy, K., M. Kannan, R. Karthikeyan, S. Prashanth e B. Rohith Reddy. "A Review on Mechanical and Thermal Properties of Aluminum Metal Matrix Composites". E3S Web of Conferences 184 (2020): 01033. http://dx.doi.org/10.1051/e3sconf/202018401033.

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The Aluminum Metal Matrix Composites (AMMCs) have been becoming suitable materials for many devices in the application of various fields like heavy equipment’s industry, automobile, aeronautics and etc. because of its excellent physical and structural characteristics. The research on AMMC dealt the effect of reinforcement such as fly-ash, SiC, Al2O3, Graphite, B4C, Cubic Boron Nitride (CBN) on aluminium in different percentages. Every reinforcement has its own characteristics that enhance the base aluminium characteristics when added. By adding these types of reinforcement to metal base led to enhance the properties like wear resistance, stiffness, creep, tensile strength, fatigue, toughness, thermal conductivity, hardness in comparison with traditional approach on materials engineering. This review paper was aimed to give the detailed information about the impact of various reinforcements incorporated in matrix by illustrating its benefits and drawbacks. This extensive survey on AMMC could be useful to develop farther.

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Kohli, Ankush, H. S. Bains, Sumit Jain e D. Priyadaradarshi. "Machinability and Wear of Aluminium based Metal Matrix Composites by MQL - A Review". Material Science Research India 14, n. 2 (31 agosto 2017): 194–203. http://dx.doi.org/10.13005/msri/140218.

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Metal matrix composites have exhibited better mechanical properties in comparison withconventional metals over an extensive range of working conditions. This makes them an appealing alternative in substituting metals for different applications. This paper gives a survey report, on machining of Aluminium metal Matrix composites (AMMC), particularly the molecule strengthened Aluminium metal matrix composites. It is an endeavour to give brief record of latest work to anticipate cutting parameters and surface structures in AMMC. The machinability can be enhanced by the utilization of Minimum Quantity Lubrication (MQL) during the machining of AMMC.

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Umanath, K., T. Nithyanandhan, Adarsh Ajayan, D. Devika, M. Gokul Prasath, S. Aravind Kumar e R. Ganeesh. "Machinability study of Aluminium 6082 reinforced with boron carbide and titanium by stir casting method using Abrasive water jet machining process". Engineering Research Express 4, n. 1 (21 gennaio 2022): 015011. http://dx.doi.org/10.1088/2631-8695/ac4ab3.

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Abstract Aluminium Metal Matrix Composite (AMMC) has broad uses in the medical, aerospace, and automobile industries, which have long sought lightweight materials with superior designs and improved properties to improve performance. This analysis has aimed to prepare an AMMC to investigate its machining and mechanical properties. The AMMC is produced using a stir casting process by reinforcing boron carbide and titanium with aluminium 6082. The material’s mechanical properties are studied by using wear test, hardness test, and corrosion test. The wear rate increases when the load increases by varying the load and time with speed as a constant. It is found that the hardness of a material is increased due to titanium and boron carbide as the reinforcement particle in the fabricated AMMC. Using the pitting corrosion technique, the corrosion occurs on the AMMC under the estimated time at room temperature. In order to illustrate the machining characteristics of the aluminium metal matrix composite, an Abrasive Water Jet Machining (AWJM) process has been used. The experiments use L9 orthogonal Array using Taguchi’s method and ANOVA analysis. The input parameters considered are Traverse rate, Stand-off distance, and Nozzle diameter. To find the optimum value of circularity, cylindricity, and surface roughness by varied input parameters. The respective graphs are also plotted. Scanning electron microscopic analysis was performed on the wear-tested specimen and machining surface of the material to determine the distribution of reinforced material and investigate the material’s fracture mechanism. It is found that wear tracks, voids, delamination, micro pits, embedded garnet abrasive particles are located on the machined surface of the AMMC.

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Sagdieva, M. G., S. I. Borminskiy, Z. E. Rakhmatullaeva, A. K. Tonkikh, K. S. Sanakulov e B. Scott. "Biohydrometallurgical Processing of Flotation Tailings from Different Copper Mills". Advanced Materials Research 20-21 (luglio 2007): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.299.

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Two copper flotation tailings samples, one from the Almalyk Mining and Metallurgical Complex, Uzbekistan (sample designated AMMC) and the other from Whitehorse (WT), Yukon, Canada, were bioleached at laboratory scale. Acidophilic, iron- and sulphur-oxidizing cultures were enriched from the two tailings and these cultures were used for the testing. After 24 weeks of bioleaching in percolator columns 70-72% of the copper was leached from the AMMC tailings and 91-93% of the copper was leached from the WT tailings. The chalcopyritic nature of the copper and larger particle size of the AMMC tailings compared to the WT tailings were likely reasons that copper extraction was greater for the AMMC tailings. In-column, thiosulphate leaching of biooxidized residues yielded 90+% gold extraction for both tailings. In other testing the two cultures were subjected to an electromagnetic field during growth on ferrous iron. Compared to untreated controls, cultures subjected to the electromagnetic field oxidized iron more rapidly. Although magnetite, which exerts an electromagnetic field, was present in the AMMC tailings, there was no evidence that this magnetite had any effect on the bioleaching results. However, given the enhanced performance of the iron-grown cultures under the influence of an electromagnetic field, we believe that additional research should be performed to investigate this phenomenon

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Murtala Dankulu Hassan, Mu'azu Musa, Mannir Ibrahim Tarno, Salihu Sani e Naif Mohammed Lawal. "THE CORRELATION OF MICROSTRUCTURE, AND MECHANICAL PROPERTIES OF NOVEL Fe3O4-(AuTe2) –REINFORCED ALUMINIUM MATRIX COMPOSITE PRODUCED VIA RECRYSTALLIZATION ROUTE". FUDMA JOURNAL OF SCIENCES 6, n. 6 (1 gennaio 2023): 22–30. http://dx.doi.org/10.33003/fjs-2022-0606-1130.

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Aluminum Metal Matrix Composites (AMMC) have been becoming suitable materials for many devices in the application of various fields such as medical equipment, aircraft, electrical motors, overhead transmission lines, construction, etc. Aluminum was reinforced with the Fe3O4-(AuTe2) through the recrystallization process, hence, AMMC was successfully developed. The aim was to characterize the microstructure and phase patterns of the developed AMMC and compare it with conventional Aluminum as well as its thermos-mechanical characteristics. Physical, mechanical, and morphological properties of the composite and regular Al were examined. Based on the outcomes, the microstructural examination of the composite showed that the Al matrix had a sizable distribution of reinforcement components. Additionally shown was the creation of new phases, which significantly improved the strength and corrosion resistance of the composite. The influence of the reinforcement materials was found to have greatly enhanced the hardness tests. From 60 HRB for ordinary Al to 92.3 for AMMC, the hardness rose. Hence, after corrosion tests in an acidic solution (5% H2SO4 + H2O) hardness also increased from 41.1 HRB of the conventional Al to 52.8 HRB of the AMMC. Therefore, Corrosion resistance is improved by adding this reinforcement (Al- Fe3O4-(AuTe2) to the composite (lower corrosion rate). We then chose Al-5Fe3O4-10(AuTe2) as an optimal composite after comparing all the samples.

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Vall, Maria, Natalia Ferraz, Ocean Cheung, Maria Strømme e Teresa Zardán Gómez de la Torre. "Exploring the Use of Amine Modified Mesoporous Magnesium Carbonate for the Delivery of Salicylic Acid in Topical Formulations: In Vitro Cytotoxicity and Drug Release Studies". Molecules 24, n. 9 (11 maggio 2019): 1820. http://dx.doi.org/10.3390/molecules24091820.

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Salicylic acid (SA) has for a long time been used to treat various skin disorders due to its anti-inflammatory, bacteriostatic, and antifungal properties. In the present work, mesoporous magnesium carbonate (MMC), a promising drug carrier, was modified with 3-aminopropyl-triethoxysilane to enable loading of SA. The amine modified MMC (aMMC) was successfully loaded with 8 wt.% of SA via a solvent evaporation method. SA was later completely released from the carrier in less than 15 min. Furthermore, the cytotoxicity of the functionalized material was evaluated. aMMC was found to be non-toxic for human dermal fibroblast cells with particle concentration of up to 1000 µg/mL when exposed for 48 h. The presented results form the basis of future development of aMMC as a potential carrier for SA in dermatological applications.

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Jain, Pushpendra, S. Soni e Prashant Baredar. "Review on Machining of Aluminium Metal Matrix Composites". Material Science Research India 11, n. 2 (3 novembre 2014): 114–20. http://dx.doi.org/10.13005/msri/110204.

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Metal matrix composites have superior mechanical properties in comparison to metals over a wide range of operating conditions. This make them an attractive option in replacing metals for various engineering applications. This paper provides a literature review, on machining of Aluminium metal matrix composites (AMMC)especially the particle reinforced Aluminium metal matrix composites. This paper is an attempt to give brief account of recent work to predict cutting parameters &surface generated in AMMC.By suitably selecting the machining parameters, machining of AMMC can be made economical.

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Dheeraj Kumar, Gajula, Nallimelli Sreenivasa reddy, Bhavanasi Subbaratnam, Angadi Seshappa, Y. Krishna Bhargavi, Kseniia Iurevna e Usanova. "Optimization of Engineering Properties in Al-7175/SiC/B4C Alloy". MATEC Web of Conferences 392 (2024): 01020. http://dx.doi.org/10.1051/matecconf/202439201020.

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The growth of the industrial sector has resulted in a higher use of Aluminium Metal Matrix Composites (AMMCs). These composites are well-known for their exceptional mechanical and tribological qualities, attracting worldwide attention, especially in the automotive, architectural, and aerospace industries. Advanced Metal Matrix Composites (AMMCs) exhibit increased specific strength, improved strength-to-weight ratio at increasing temperatures, and better wear resistance when compared to the basic matrix without any additional components. SiC and B4C particle reinforcements are used to enhance the metallurgical and mechanical characteristics of the base matrix. Authors have used several production methods such as Powder Metallurgy for solid-state procedures and Stir Casting, Compo-casting, Squeeze Casting, and in-situ casting for liquid-state processes to create AMMCs. Stir casting is the most cost-effective and easy process for producing AMMC. This article provides an in-depth explanation of the procedure for producing Aluminium Matrix Metal Composites (AMMCs) utilising AL-7175 as the matrix material, together with B4C and SiC as reinforcements, with the stir casting technique.

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Muthazhagan, Chinnasamy, A. Gnanavelbabu, K. Rajkumar e G. B. Bhaskar. "Corrosion Behavior of Aluminium-Boron Carbide-Graphite Composites". Applied Mechanics and Materials 591 (luglio 2014): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amm.591.51.

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The corrosion behaviour of Al (6061)-B4C-Graphite was investigated. The Aluminium Metal Matrix Composites (AMMC) was fabricated through two step stir casting method. The composites were fabricated with various volume percentages of Boron Carbide (5, 10 &15%) and Graphite (5, 10& 15%). Corrosion studies of AMMC was investigated with 4%, 8%, 12% wt. % NaCl solution at room temperature. Also erosion-corrosion test were performed on the specimens in the NaCl solution with silica sand. Erosion-corrosion tests indicated that the rate of material loss mechanism is mechanical abrasion with enhanced corrosion. The material loss mechanism was significantly higher in the case of erosion-corrosion tests.

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Khalifa, M., O. Anas, M. Shamekh e M. Osman. "On the microstructure and hardness evaluation of aluminum metal matrix composites reinforced with in situ (Fe-Al-Cr-Ni) intermetallic compounds". Journal of Physics: Conference Series 2811, n. 1 (1 luglio 2024): 012016. http://dx.doi.org/10.1088/1742-6596/2811/1/012016.

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Abstract In this study, Aluminum metal matrix composites (AMMCs) were produced through stir casting technique, using in situ intermetallic compounds as reinforcement. The in situ synthesis of these reinforcement phases involved the addition of stainless-steel particles (type 316L) at various weight percentages of 5, 10, and 15 wt. %. The impact of varying the amount of stainless particles added on the hardness and microstructure of the resulting AMMCs was examined. X-ray diffraction patterns (XRD) and energy dispersive spectroscopy (EDS) analysis reveal the formation of two types of intermetallic compounds: iron aluminide intermetallic compounds in irregular plate and needle-like morphologies and another one with higher percentage of Cr in a hexagonal-plate like morphology. Microstructural characterization shows a reputable distribution of the newly formed intermetallic phases. The findings indicate that the hardness of the composites improves as the stainless particles content increases. Hardness of the AMMC fabricated by adding 15 wt.% stainless steel was tripled compared with that of pure aluminium.

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Horbatyi, I. V., U. S. Carp e I. R. Tsymbaliuk. "Modulator for implementation of amplitude modulation of many components". Технология и конструирование в электронной аппаратуре, n. 3-4 (2021): 30–35. http://dx.doi.org/10.15222/tkea2021.3-4.30.

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The authors consider various anti-noise techniques in systems using digital signals, in particular QAM (quadrature amplitude modulation) signals. To increase the noise immunity of a system, it is proposed to use amplitude modulation of many components (AMMС). The advantages of this approach are demonstrated. The principles of AMMС signal formation are explained. The frequency efficiency, energy efficiency, and information efficiency of such signals are theoretically calculated. Different types of digital modulation are compared, the data being presented as a table, and a conclusion is made about a possible practical implementation of the modulator for AMMC signal formation. Structural and functional diagrams of the modulator for AMMC implementation are proposed. The study formulates basic operating principles of such a device, which are used to propose a design option of the modulator. The paper describes particular aspects of creating the main units of the modulator. The authors investigate the characteristics of such a device, particularly the spectrum of the output signal. The obtained research results allow drawing a conclusion that the device complies with the formulated implementation principles of the declared modulation type. A general conclusion is made that the manufactured modulator is suitable for the AMMC. The device is proposed to be used in modern digital communication systems, such as mobile communication systems.

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Horbatyi, I. V. "Calculation of symbol error rate in a telecommunication system based on amplitude modulation of many components". Mathematical Modeling and Computing 8, n. 2 (2021): 137–49. http://dx.doi.org/10.23939/mmc2021.02.137.

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The known analytical equations for calculating the symbol error rate (SER) in the M-ary telecommunication system are considered. The analytical equations for calculating SER in a telecommunication system based on M-ary amplitude modulation of many components (M-AMMC) and other varieties of amplitude-phase shift keying with arbitrary number and arbitrary location of signal points of the signal constellation, as well as under the action of additive white Gaussian noise in a communication line are proposed. According to the results of the research, it is found that the proposed equations allow us to increase the accuracy of calculating SER when using M-AMMC and other varieties of amplitude-phase shift keying compared to known analytical equations.

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Sujan, D., C. W. Yeo, Muhammad Ekhlasur Rahman, M. Mohan Reddy, Md Abdul Maleque e Mohammad Yeakub Ali. "Aluminum-Silicon Carbide Composites for Enhanced Physio-Mechanical Properties". Advanced Materials Research 576 (ottobre 2012): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.576.370.

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Stir casting method is used in the production of SiC reinforced-aluminium metal matrix composite (AMMC) to enhance the properties of base metal. Different weight fraction of Silicon carbide, SiC (5 wt%, 10 wt% and 15 wt %) particulate-reinforced AMMCs are fabricated and characterizations of physical and mechanical properties of the materials are performed based on the experimental. The microstructure of the fabricated composite material are studied and analyzed. The results indicate that the mechanical properties of the composite, including yield strength, tensile strength and hardness are enhanced by the increment of the weight fraction of reinforcing phase. Nevertheless, the elongation and fracture toughness of the composite decreased as the reinforcing phase increased. This is mainly due to the brittleness of the SiC particles which act as micro void initiator.

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Adiga, Karthik, Mervin A. Herbert, Shrikantha S. Rao e Arunkumar Shettigar. "Applications of reinforcement particles in the fabrication of Aluminium Metal Matrix Composites by Friction Stir Processing - A Review". Manufacturing Review 9 (2022): 26. http://dx.doi.org/10.1051/mfreview/2022025.

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Composite materials possess advantages like high strength and stiffness with low density and prove their essentiality in the aviation sector. Aluminium metal matrix composites (AMMC) find applications in automotive, aircraft, and marine industries due to their high specific strength, superior wear resistance, and lower thermal expansion. The fabrication of composites using the liquid phase at high temperature leads to the formation of intermetallics and unwanted phases. Friction Stir Processing (FSP) is a novel technique of composite fabrication, with temperature below the melting point of the matrix, achieving good grain refinement. Many researchers reported enhancement of mechanical, microstructure, and tribological properties of AMMC produced by the FSP route. The FSP parameters such as tool rotational speed, tool traverse speeds are found to be having greater impact on uniform dispersion of particles. It is observed that the properties such as tensile strength, hardness, wear and corrosion resistance, are altered by the FSP processes, and the scale of the alterations is influenced significantly by the processing and tool parameters. The strengthening mechanisms responsible for such alterations are discussed in this paper. Advanced engineering materials like shape memory alloys, high entropy alloys, MAX phase materials and intermetallics as reinforcement material are also discussed. Challenges and opportunities in FSP to manufacture AMMC are summarized, providing great benefit to researchers working on FSP technique.

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Shalini Kora, P. L. S., e Nipun Gorantla. "Study On Behaviour Of Aluminium Metal Matrix Composite Reinforced With Silicon Carbide And Titanium Diboride." IOP Conference Series: Earth and Environmental Science 1130, n. 1 (1 gennaio 2023): 012030. http://dx.doi.org/10.1088/1755-1315/1130/1/012030.

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Abstract Advanced designed materials like metal matrix composites (MMC) consists of at least two constituent parts, a matrix and reinforcement of different materials such as metals, fibers, glass, organic compounds, or ceramics. An MMC can exhibit various enhanced properties like lightweight, high-specific strength and better ductility when compared with a single material. They have an advantage of the increasing mechanical and physical characteristics of the composite by varying the reinforcement percentages by volume fractions or orientation of fibers or laminates. The most popular materials such as aluminum, titanium, magnesium, and silicon carbide are possible reinforcement materials with aluminum as matrix. This work is mainly focused on study on behaviour of Aluminum Metal Matrix Composite, reinforced with Silicon Carbide and Titanium diboride for various kinds of loads and optimization for tensile strength and ductility. In this work two composite models of size 60µm * 60µm * 60µm with a reinforcement volume proportion of 20% of SiC and TiB2 were compared with the use of FEM tool (ABAQUS CAE). The tool is basically used for assigning different material properties such as young’s modulus, Poisson’s ratio, yield stress & different loads and to extract the results in the form of various stresses and strains on the modeled aluminum metal matrix composite (AMMC). The test results showed that the AMMC with SiC as reinforcement has better young’s modulus and tensile strength than AMMC with TiB2.

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Tsymbaliuk, I. "ONE-DIMENSIONAL CONVOLUTIONAL NEURAL NETWORK MODEL FOR PROCESSING AMPLITUDE MODULATION ON MANY COMPONENTS SIGNALS". Information and communication technologies, electronic engineering 4, n. 1 (12 maggio 2024): 102–11. http://dx.doi.org/10.23939/ictee2024.01.102.

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The processing of radio signals using artificial neural networks (ANNs) has great potential for research, which can be explained by the adaptability of ANNs to various transmission conditions and the ability to detect abstract patterns of changes in signal parameters. The article reviews the works of other authors devoted to different ways of using ANNs for processing radio signals. Taking into account the information in the reviewed works, the research task was formed, which consists in developing an optimized ANN model for radio signal processing. Signals with amplitude modulation of many components (AMMC) were chosen to form training samples for ANN. The choice of modulation type is justified by greater energy efficiency compared to other widely used digital modulation types, such as quadrature amplitude modulation. Mathematic basis of AMMC signal generation is described. The process of finding the coordinates of three component 8-AMMC signal constellation is explained, the formation of signals in the time plane based on the found coordinates is explained as well as their discretization and the addition of white noise. An iterative algorithm for generating initial data for ANN based on the described ratios is proposed. The general structure of one-dimensional convolutional neural network is considered. Functions of individual neurons, connections between them, the formation of layers and the convolution operation are described mathematically. On the basis of the previously given ratios, a final display of the network was formed. Specific dimensions and activation functions for layers are selected. The use of convolutional layers is justified by time invariance. Based on the reviewed mathematical models, selected activation functions and dimensions, a neural model was formed. The process of validating the effectiveness of the formed neural model is described, which is based on comparing the symbolic error probabilities of the proposed and reference models at different signal-to-noise ratios. The validation results are presented. The advantages of the obtained model over the previously proposed purely recurrent model and the AMMC reference receiver are explained.

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Behera, Rajesh Kumar, Birajendu Prasad Samal, Ajit Kumar Khatua e Sarat Chandra Panigrahi. "Study on Dry Sliding Wear Characteristics by Taguchi Analysis of Al-Mg-Si-Cu-SiC Composite Prepared by Powder Metallurgy Method". Trends in Sciences 18, n. 19 (30 settembre 2021): 12. http://dx.doi.org/10.48048/tis.2021.12.

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There is a growing attention among researchers to the production of new composites with low-density and low-cost processes. Aluminum based metal-matrix composites (AMMC) offer solutions for new product development. In this paper, a newly developed Al-Mg-Si-Cu-SiC composite was manufactured by powder-metallurgy, and the wear mechanism of aluminum composite materials was carried out using the pin-on-disk method. The purpose of the experimental plan was to correlate the factors that influenced the wear operations in order to execute them with a minimal rate of wear and co-efficient of friction (COF). The experiment was based on the Taguchi design with OA (orthogonal arrays) to correspond to the effects of load applied, sliding speed, and distance. The design features are distinctive and integral attributes of the method, affecting and determining the wear characteristics of composites.The predictive models developed for various machining performance characteristics employing response surface methodology are effective in terms of adequate, statistically significant, and probabilistically validate because of their higher R2-values, P-values less than 0.05 and larger AD-test p-values. The data generated for the Al-Mg-Si-Cu-SiC AMMC will be useful for the industry. HIGHLIGHTS Preparation of AMMC through powder metallurgy method The WR decreases with the rise in wt% of SiC reinforced particles Taguchi orthogonal design model is best suited to examine dry sliding wear characteristics of an Al-0.5Si-0.5Mg-2.5Cu-10SiC composite Using the Taguchi-optimization method, it is more expedient to obtain the minimum WR of the composites GRAPHICAL ABSTRACT

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Srivastava, Ashish, Amit Rai Dixit e Sandeep Tiwari. "A Review on Fabrication and Characterization of Aluminium Metal Matrix Composite (AMMC)". International Journal of Advance Research and Innovation 2, n. 2 (2014): 240–48. http://dx.doi.org/10.51976/ijari.221432.

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The trend towards the use of composites is increasing rapidly in the ongoing scenario and is likely to increase more rapidly in the future. Nowadays aluminium and its alloy based composites are gaining importance in the upcoming fields of engineering. Aluminium metal matrix composite (AMMC) possess superior strength, hardness, corrosion resistance, fatigue and creep resistance in addition to low weight advantage of aluminium. Aluminium based composites (AMMC) are widely used in aerospace and automotive industries due to high strength to wear ratio. Mechanical Components due to insufficient strength fails under various types of loading. Modern mechanical components require advance properties, the material available in pure form do not possess the required strength, hardness, corrosion resistance etc. A Composite is formed by combination of two or more physically and chemically distinct substances and is fabricated to enhance the characteristics of base metal. The material is then characterized by the different types of analysis like tensile, impact, hardness, along with thermal analysis such as XRD and DTA. Metal matrix composite (MMC) are formed when the base metal is metal and reinforcement takes place in the form of powder, particles, fibers and whiskers. Reinforcements in the metal matrix composite may be a metal or other material which may be ceramic or any other organic compound. Metal matrix composites (MMC) possess significantly enhanced properties which improve the functioning as well as service life of the various mechanical components. This paper is aimed to review the theory, experiments and methodology to fabricate aluminium metal matrix composites (AMMC) and also the characterization of fabricated material.

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Горбатий, Іван Володимирович. "Радіочастотний 4-канальний фазоповертач у діапазоні 0-360° з цифровим керуванням для телекомунікаційних систем з амплітудною модуляцією багатьох складових". Известия высших учебных заведений. Радиоэлектроника 65, n. 5 (22 maggio 2022): 297–308. http://dx.doi.org/10.20535/s002134702205003x.

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У статті запропоновано радіочастотний 4-канальний фазоповертач в діапазоні 0–360° з цифровим керуванням. Цей фазоповертач є частиною 4-канального AMМС модулятора (Amplitude Modulation of Many Components) та 4-канального AMМС демодулятора, які використовуються для генерування та оброблення сигналів на основі нового високоефективного типу амплітудно-фазової модуляції AMMC. AMМС модулятор та AMМС демодулятор є частинами перспективної високоефективної телекомунікаційної системи передавання даних. Перевагами запропонованого фазоповертача є можливість незалежно змінювати початкові фази на кожному виході фазоповертача в діапазоні 0–360°, висока точність встановлення різниці фаз сигналів на виходах фазоповертача, стабільність амплітуд сигналів на виходах фазоповертача, широкий діапазон робочих частот та цифрове керування початковими фазами сигналів на виходах фазоповертача за допомогою програмного забезпечення, встановленого на комп’ютері. Запропонований фазоповертач може бути використаний у телекомунікаційних системах для високошвидкісного передавання даних при генеруванні чи обробленні PSK, ASK, QAM та AMMC сигналів. Також цей фазоповертач може бути використаний у високонадійних телекомунікаційних системах з комплексною системою контролю та гарячим резервуванням.

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Makhmarezhabov, Dilmurod, Javlon Bekpulatov, Gulnarakhon Salizhanova, Sevara Amindjanova, Zarina Abdurasulova e Shakhnoza Rasulova. "Enrichment of manufactured waste at the AMMC copper processing factory in Uzbekistan". E3S Web of Conferences 497 (2024): 02039. http://dx.doi.org/10.1051/e3sconf/202449702039.

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This article is devoted to the additional extraction of valuable components from the waste tailings of the AMMC copper processing plant. The mineral composition of the waste tailings of the CCP is mainly represented by quartz, feldspars, sericites and, in a subordinate amount, mafic and secondary minerals. Pyrite is the most widespread ore mineral in the waste tailings of the CCP. Chalcopyrite, sphalerite, galena, molybdenite, and iron oxides are also noted. The copper content in the selected spot samples from tailings after chemical analysis averaged 0.139%. A sieve analysis was carried out to determine the granulometric composition of waste tailings, the distribution of valuable components by size classes. On the basis of the obtained results on the study of the material composition, flotation of tailings of the CCP AMMC was carried out with recleaning of the main flotation concentrate. During tailings flotation with one recleaning of the main flotation concentrate, the extraction of copper and molybdenum into the total concentrate is 56.8% and 63.8%, respectively.

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Varsha Pathak, R S Mishra e Ranganath MS. "Optimization of HVOF Spray Parameters for WC-Co-Cr Coatings on AMMC (Al-RHA) for Pump Impeller Protection". International Journal of Maritime Engineering 1, n. 1 (27 luglio 2024): 219–28. http://dx.doi.org/10.5750/ijme.v1i1.1353.

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Present study investigates the enhancement of pump impeller materials using aluminium matrix composites (AMCs), specifically focusing on Al 7075 Alloy strengthened with rice husk ash (RHA) for enhanced durability and resistance to corrosion. It employs Thermal spraying using high-velocity oxygen-fuel (HVOF) to apply WC-Co-Cr powder, emphasizing low porosity, high adherence, and superior wear and corrosion resistance. By optimizing HVOF spray parameters using Taguchi L25 Orthogonal array, the research aims to minimize porosity and maximize hardness, addressing challenges in material dispersion, sustainability, and process control. The objective is to develop predictive models for the microhardness and porosity characteristics of WC–10Co–4Cr coating powder utilized through HVOF on AMMC substrates. AMMC substrates. Spray distance, carrier gas flow rate, powder feed rate, oxygen flow rate, and LPG flow rate are examined, with spray distance exerting the most significant influence on porosity, followed by powder feed rate and other parameters. This study contributes to improving coating characteristics crucial for industrial applications.

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Bhutta, Muhammad Raheel, Fouzia Gillani, Taiba Zahid, Saira Bibi e Usman Ghafoor. "Investigation of Hardness and Microanalysis of Sintered Aluminum-Based Supplemented Metal Matrix Machined Composites". Crystals 13, n. 9 (4 settembre 2023): 1347. http://dx.doi.org/10.3390/cryst13091347.

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Abstract (sommario):

Aluminum metal matrix composites (AMMCs) have become increasingly ubiquitous in the fields of aerospace and automobile businesses due to their lightweight properties. Their machining is a challenging task because of the presence of supplemented particles, also called reinforcements. As the wt% of the supplemented particles changes, the morphological and machining behaviors of the AMMCs change. The present work is focused on exploring the thermo-mechanical properties of AMMCs which would help in AMMC applications in the aerospace industry with a new collection of composites containing silicon carbide (SiC) and zircon/zirconium silicate (ZrSiO4) as supplements in wt% of 5%, 20%, 30%, and 40%. Uniform binary and hybrid sample pallets are prepared by powder metallurgy (PM). The said samples are sintered and then machined using wire electric discharge machining (WEDM) employing brass wire with a feed rate of 2 to 3 mm/min. Also, analysis of porosity and recast layer formation is performed via the microstructure, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). Some interesting and useful findings are obtained which can extend the applications of AMMCs in automobiles and the aerospace industry. The results reveal that temperature and wt% are playing their significant roles in the changes in the thermo-mechanical properties of AMMCs. Mathematical equations via regression analysis using Minitab 17 and Excel are developed for the congruence of experimental data. Analysis of Variance (ANOVA) is also performed. Hence, the most optimized relationships for the best machining output are established and presented in this proposed study.

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Sheraf, Jakie, e Solomon Darius Gnanaraj. "Characterization of a functionally graded aluminium metal matrix composite (AMMC)". Materials Letters 352 (dicembre 2023): 135110. http://dx.doi.org/10.1016/j.matlet.2023.135110.

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28

Singh, Dhirendra Pratap. "Optimization of Electric Discharge Machining of Al/Al2O3 Metal Matrix Composites using MOPSO". International Journal of Engineering Research in Mechanical and Civil Engineering (IJERMCE) 9, n. 5 (18 maggio 2022): 39–47. http://dx.doi.org/10.36647/ijermce/09.05.a007.

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In this article, Response Surface Methodology (RSM) and Multi-objective Particle Swarm Optimization (MOPSO) were used to optimize the output response of Material Removal Rate (MRR) and Surface Roughness(SR) of die-sinking Electrical discharge machining (EDM). An aluminum based metal matrix composites, reinforced with alumina, prepared by stir casting, was used for machining on EDM by Copper (Cu) and Titanium (Ti) tool. Box- Behnken Design (BBD) approach of RSM was used to design the experiment by considering four input factors at three levels. This developed model for multi-objective optimization by MOPSO and an RSM-based multi-objective optimization was also designed for input parameters. And it was found that the MOPSO technique was easy and valuable for parametric optimization of EDM. From MOPSO, optimized input parameters for machining of AMMC using Cu tool are current 4A, Voltage 60V, pulse on-time 100 µs, and duty factor 6. From MOPSO, optimized input parameters for machining of AMMC using Ti tool are current 4.241658A, Voltage 60V, pulse on-time 100 µs, and duty factor 4. The confirmatory test found that MRR and SR decreased by 63.86 % and 53.083% for the Cu tool, respectively, for MOPSO compared to RSM optimize value.

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Chaudhari, Mukesh, e M. Senthil Kumar. "Reinforcement and Cutting Tools Interaction during MMC Machining - A Review". Nano Hybrids and Composites 22 (settembre 2018): 47–54. http://dx.doi.org/10.4028/www.scientific.net/nhc.22.47.

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Abstract (sommario):

Aluminum based metal matrix composites (AMMC) have found its applications in the automobile, aerospace, medical, and metal industries due to their superior mechanical properties. Fabricated Aluminum based metal matrix composites require machining to improve the surface finish and dimensional tolerance. Machining should be accomplished by good surface finish by consuming lowest energy and less tool wear. This paper reviews the machining of Aluminum based metal matrix composites to investigate the effect of process parameters such as tool geometry, tool wear, surface roughness, chip formation and also process parameters.

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Khokhar, Ostin, Akhil Khajuria e Raman Bedi. "An initial study on the impression creep behaviour of stir-cast GNP reinforced AA6061 composite (AMMC)". IOP Conference Series: Materials Science and Engineering 1248, n. 1 (1 luglio 2022): 012086. http://dx.doi.org/10.1088/1757-899x/1248/1/012086.

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Abstract Impression creep testing technique is used to screen out creep behaviour of materials as it is relatively faster method, requires small volume of the specimen, and is relatively material non-invasive technique when compared to conventional uniaxial tensile creep test method. This technique also possesses the benefit of maintaining constant stress throughout the experiment because a flat cylindrical indenter is used to apply load on the specimen. Owing to commercial unavailability of the materials under development such as metal matrix composites (MMC), the impression creep testing approach for such materials becomes a best method. In present work, creep behaviour of stir-cast graphene nanoplatelets (GNP) reinforced AA6061 composite (AMMC) is studied by using impression creep tests. The AMMC was prepared by adding GNPs in AA6061 through stir casting process by melting the alloy up to 1073 K. The impression creep experimentation included stress levels of 140 MPa, 170 MPa, and 200 MPa at a temperature of 573 K, 603 K and 633 K. The tests were conducted at constant stress by varying the temperature and vice-versa in vacuum. Two distinct regions i.e., primary and secondary/steady-state were observed and minimum creep strain rate was obtained in steady-state region. Tertiary region was absent, since the load/stress applied was compressive. During the experiment, depth of indentation of 0.03 mm to 0.14 mm was produced in the specimen. The microstructure of the composite has been analyzed using optical microscope and scanning electron microscope (SEM) to correlate with impression creep behaviour of the studied materials.

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Seki, Haruyoshi, Yumi Ishiguro, Hiroyoshi Miyakawa, Takako Morimoto e Azusa Kamikouchi. "Anatomy of the secondary auditory neurons AMMC-A1 in the Drosophila brain". Neuroscience Research 71 (settembre 2011): e151. http://dx.doi.org/10.1016/j.neures.2011.07.651.

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32

Dhanunjay, M., A. Sreenivasulu Reddy e M. Madduleti. "Study on mechanical properties of AMMC and optimization of WEDM process parameters". Manufacturing Technology Today (MTT) 22, n. 9-10 (1 ottobre 2023): 10–26. http://dx.doi.org/10.58368/mtt.22.9-10.2023.10-26.

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33

Parivash, Ranjbar. "Signal Processing Methods for Improvement of Environmental Perception of Persons with Deafblindness". Advanced Materials Research 902 (febbraio 2014): 398–404. http://dx.doi.org/10.4028/www.scientific.net/amr.902.398.

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Environmental perception is a functional area that is severely limited in persons with deafblindness (DB) who belong a category of people with severe disabilities. Monitor is a vibratory aid developed with the aim to improve environmental perception of persons with DB. The aid consists of a mobile phone with an application connected to a microphone and vibrator. Monitor picks up the sounds produced by events by microphone, processes the sound using an algorithm programmed as an application in the mobile phone and then presents the signal via the vibrator to the persons with DB to be sensed and interpreted. In previous laboratory studies, four algorithms (AM, AMMC, TR, and TRHA) were developed based on modulating, and transposing principles. The algorithms were tested by persons with normal hearing/hearing impairment and selected as good candidates to improve vibratory identification of environmental sounds. In this on-going the algorithms are tested by 13 persons with congenital D and five persons with DB using Monitor in a realistic environment, living room, kitchen or office. Forty five recorded environmental sounds were used as test stimuli. The subjects tested the algorithms two times, Test and Retest each including a test session initiated by a training session. The four algorithms were tested in four days at Test and four days at Retest in total eight test days. Each test day began with a training session where a sound was presented as vibrations to be sensed by the person with the aim to remember its pattern and identity. The 45 sounds were grouped in four groups where an specific algorithm was chosen to process an specific sound group in a specific day. At the test session a sound was presented and the person was given 5 randomly chosen sound alternatives to choose the one as represented sound. The algorithms were different for different sound groups during four different test days so all algorithms were used to process all sounds. The algorithms were tested a second time, Retest, in same way as in Test. The mean value of identification of environmental sounds varied between 74.6% and 84.0% at Test and between 86.9% and 90.4% at Retest. The identification results at Retest were significantly improved (p<0.01) for all algorithms after a relatively short time of training indicating a good learning effect. At Test the algorithm AM was significantly better than the algorithms AMMC and TRHA (p< 0.01) and the algorithm TR was better than TRHA (p<0.01). The algorithms AM, AMMC, and TR were selected as good candidates to be implemented in the Monitor to improve environmental perception.

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Sukumar, Madiri Samuel, Borra Vijay Sudheer Reddy e P. Venkataramaiah. "Analysis on Multi Responses in Face Milling of Ammc Using Fuzzy-Taguchi Method". Journal of Minerals and Materials Characterization and Engineering 03, n. 04 (2015): 255–70. http://dx.doi.org/10.4236/jmmce.2015.34028.

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35

S, Rajkumar, Loganathan S, Venkatesh R e Madhan Prabhu Deva B S. "Investigate of Wear Behaviour and Mechanical Properties of Titanium Diboride Reinforced AMMC Composites". Journal of New Materials for Electrochemical Systems 24, n. 1 (31 dicembre 2021): 254–60. http://dx.doi.org/10.14447/jnmes.v24i4.a04.

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36

Prabhu Deva, Madhan, A. Parthiban, B. Radha Krishnan, Adisu Haile e Wubishet Degife. "Investigation of Wear Behaviour and Mechanical Properties of Titanium Diboride Reinforced AMMC Composites". Advances in Materials Science and Engineering 2022 (1 febbraio 2022): 1–9. http://dx.doi.org/10.1155/2022/5144010.

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The aluminium metal matrix composites (AMMCs) are preferred in automotive and aerospace industries for higher strength, weight ratio, good corrosion resistance, and also better tribological properties. This study proposed that the AA7075 alloy methodology was enhanced by stir casting with titanium diboride (TiB2) particles at different percentages (5, 10, and 15 wt. %). The preheated titanium diboride powder is spread to the molten state AA7075 at 870°C to provide good weight resistance and delivery. The prepared composites are evaluated by wear analysis, tensile properties, hardness range, and microstructural behavior studies. Pin-on-disk and Rockwell hardness tester were used to analyze the wear behaviour and hardness level. The tensile strength and hardness have defined the strength of the proposed composite while the addition of TiB2 particles improves the hardness and tensile stress. The findings showed that adding TiB2 particles in the Al7075 matrix strengthened all properties compared to the Al7075 matrix. The scanning electron microscope and EDS were used to analyze the eroded surface and chemical composition of composites.

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Karnool, Raghavendra. "Studies on Wear and Bending Properties of AMMC�s Reinforced with Bottom Ash". International Journal for Research in Applied Science and Engineering Technology 7, n. 5 (31 maggio 2019): 1565–71. http://dx.doi.org/10.22214/ijraset.2019.5263.

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38

Jena, Pankaj Charan, Dayal R. Parhi, G. Pohit e B. P. Samal. "Crack Assessment by FEM of AMMC Beam Produced by Modified Stir Casting Method". Materials Today: Proceedings 2, n. 4-5 (2015): 2267–76. http://dx.doi.org/10.1016/j.matpr.2015.07.263.

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39

Behera, Rajesh Kumar, Birajendu Prasad Samal, Sarat Chandra Panigrahi e Sudhansu Ranjan Das. "Optimization of erosion wears of Al–Mg–Si–Cu–SiC composite produced by the PM method". Corrosion Reviews 39, n. 1 (24 dicembre 2020): 63–75. http://dx.doi.org/10.1515/corrrev-2020-0048.

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Abstract Metal matrix composites are expanding their range every day due to their various industrial applications in manufacturing sectors, to attain high performance and favorable characteristics such as light weight, more excellent corrosion as well as wear resistance, high specific strength and high temperature-resistance than conventional materials. This study deals with analysis on erosion wear characteristic and corrosion behavior of newly-engineered aluminum metal–matrix composite (Al–0.5Si–0.5Mg–2.5Cu–5SiC) developed by powder metallurgy method. Solid particle erosion test was conducted on the newly developed AMMC product and the execution of design of experiments through Taguchi and statistical techniques demonstrates the feasibility of investigating the erosion characterization and behaviors of the composites. Sixteen set of experimental trials were performed by considering three process parameters (impact angle, stand-off distance, and impact velocity) associated with four levels each. Experimental results in accordance of Taguchi’s orthogonal array design of experiments are analyzed by employing analysis of variance (ANOVA), response surface methodology (RSM) and desirability function approach for analysis, predictive modeling and optimization of erosion rate, respectively. Thereafter, an observation on eroded surface morphology is performed under the influence of impact velocity by employing scanning electron microscope (SEM) to entrench the process. Result shows that, the impact velocity followed by impact angle have significant contribution (80.42 and 8.71%, respectively) in improvement of erosion rate. The methodology proposed in this study collects the experimental results and builds a mathematical model in the domain of interest and optimized the process model. Under the highest desirability (1), desirability-function approach of RSM presented the optimal manufacturing conditions at impact velocity of 18 m/s, stand-off distance of 26 mm and impact angle of 67° with estimated erosion rate of 65.155 mg/kg. The experimental data generated for Al–0.5Si–0.5Mg–2.5Cu–5SiC AMMC will be useful for the industry.

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Singh, Paramjit. "Aluminum Based Metal Matrix Composites Behavioral Studies with Different Reinforcements- A Review". International Journal for Research in Applied Science and Engineering Technology 9, n. 10 (31 ottobre 2021): 1816–22. http://dx.doi.org/10.22214/ijraset.2021.38699.

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Abstract: Aluminum alloy’s widely employed in transportation applications like: aerospace, aviation, marine and automobile sector due to their good mechanical properties, wear properties, corrosion behavior and high strength to density ratio. The current review article mainly highlights the effects of various reinforcements on mechanical and tribological properties of aluminum based metal matrix composite materials and focuses on the types of different reinforcements. Review revealed that, there is significant improvement in mechanical properties of AMMC’s with different reinforcements as compared to traditional base alloys. The reinforcements may be SiC, TiO2 , Al2O3 , fly ash, B4C, fiber, Zircon are incorporated in the stir casting or other methods. Keywords: AMMC, Reinforcements, Mechanical properties, Stir casting etc.

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41

Horbatyi, I., I. Tsymbaliuk e Yu Bobalo. "INVESTIGATION OF THE INFLUENCE OF INSTABILITY OR INACCURACY OF MODULATOR AND DEMODULATOR PARAMETER SETTING ON THE PROBABILITY OF ERROR WHEN RECEIVING DATA". Information and communication technologies, electronic engineering 3, n. 1 (giugno 2023): 123–31. http://dx.doi.org/10.23939/ictee2023.01.123.

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The structural diagrams of devices for the forming and processing of modern amplitude-phase-manipulated signals are considered. The parameters of the modulator and demodulator have been identified, the instability or inaccuracy of whose setting significantly increases the probability of an error when receiving data. Based on the results of the research, recommendations were made regarding the necessary values of the modulator and demodulator parameters to reduce the probability of a symbol error when receiving data. The reproducibility of bit combinations to the points of the 8-AMMC signal constellation (8-position amplitude modulation of many components) is proposed to minimize the probability of a bit error in information communication systems when receiving data.

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Slamti , Miya. "L’Incontestable Pouvoir de Contrôle et d’Enquête de l’Autorité Marocaine du Marché des Capitaux (AMMC)". المنارة للدراسات القانونية و الإدارية, n. 28 (dicembre 2019): 71–85. http://dx.doi.org/10.12816/0056325.

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43

Mahendran, Dr S., e Dr S. Sukumar. "A Comparative and Experimental Study of Parametric Influence on Drilling Process of Hybrid AMMC". International Journal for Research in Applied Science and Engineering Technology, n. 6 (30 giugno 2024): 148–56. http://dx.doi.org/10.22214/ijraset.2024.62990.

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Abstract: To aim for the highest quality product quality and a high metal removal rate, metal cutting is crucial. The primary obstacle to attaining optimal quality and high production is the short tool life. The hybrid aluminum metal matrix AA 6082, with reinforcement consisting of titanium dioxide (7.5%) and cenosphere (2.5%), was optimized using the Modified Taguchi optimization method for simultaneous minimization and maximization of surface roughness (Ra), machining time, and material removal rate. The surface finish was affected by different types of geometrical precision values of the CNC drilling process parameters in order to both minimize and maximize the responses. The experiments, including call for the machining of hybrid AMMC and the use of an HSS drill bit, will be performed using a CNC with different process parameters. The L16 orthogonal array will be used for the examinations, and each experiment will be run under a distinct set of circumstances, including feed, speed, and pecking. Using the TAGUCHI design, the optimal geometrical and machining parameters were determined from the experimental output responses, and significant influences were discovered for the corresponding specific output responses.

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Kamikouchi, Azusa, Koji Hikita, Hiroshi Mizuno, Ryo Sato, Hiroyoshi Miyakawa, Kei Ito e Takako Morimoto. "Anatomy and function of the secondary auditory neurons AMMC-B1 in the fruit fly brain". Neuroscience Research 68 (gennaio 2010): e274. http://dx.doi.org/10.1016/j.neures.2010.07.1218.

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45

Singh, Harpreet, e Hiralal Bhowmick. "Tribological behaviour of hybrid AMMC sliding against steel and cast iron under MWCNT-Oil lubrication". Tribology International 127 (novembre 2018): 509–19. http://dx.doi.org/10.1016/j.triboint.2018.06.030.

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46

Khajuria, Akhil, Ankush Raina e Modassir Akhtar. "EFFECT ON PERFORMANCE MEASURES DURING DIE SINKER EDM OF AMMC BY EXTERNAL DIELECTRIC FLUSHING SYSTEM". EPH - International Journal of Science And Engineering 4, n. 1 (27 marzo 2018): 18–22. http://dx.doi.org/10.53555/eijse.v4i1.136.

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One of the important parameter in electrical discharge machining (EDM) of aluminium metal matrix composites is dielectric flushing pressure which is often not given attention due to its inbuilt presence inside the EDM set-up. Present work investigated the effect on material removal rate, tool wear rate and surface roughness with the variation of dielectric flushing pressure during EDM of 10wt.%Al2O3/AA2014. The composite was manufactured via mechanical stir casting route. For carrying out experiments on the available die sinker EDM to observe the influence of flushing pressure, a new external flushing system was developed to achieve high pressure. Kerosene oil was used as dielectric oil instead of EDM oil supplied with the machine. Only pulse current (I) was varied as an EDM input parameter considered whereas voltage (V), pulse on time (Ton) and pulse off time (Toff) were kept constant. It is found that material removal rate invariably increases with an increase in flushing pressure of dielectric oil whereas surface roughness behaves opposite. However, no significant differences are observed for tool wear rate.

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Samadov, Alisher, Nilufar Askarova, Rano Toshkodirova, Nigora Akhmedova, Olmos Boltayev, Komiljon Mirzayev e Asadjon Kambarov. "Processing of waste (tails) after flotation of copper production slag to obtain iron oxide pigment". E3S Web of Conferences 524 (2024): 02014. http://dx.doi.org/10.1051/e3sconf/202452402014.

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At this work, the processing of waste after flotation of copper production slag to obtain iron oxide pigment is presented. Based on the results of the experiments, the influence of various factors and parameters on the processing of iron-containing waste (tailings) of the copper concentration plant-2 of the AMMC was studied; This approach is both uncomplicated and efficient for extracting Fe2O3, which is regarded as a primary ingredient in the manufacturing of iron pigment. It was found that when caustic soda is used for alkaline roasting, the iron oxides in the tailings react with nitrates and hydrates to form an insoluble solid phase. Additionally, it was discovered that firing temperatures above 350 °C result in the formation of a sodium aluminate compound. This compound and the iron compounds dissolve in solutions and negatively affect the quality of the resulting Fe2O3 pigment.

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Muthuraman, Vadivel, e Murugesan Pradeepkumar. "Performance Evaluation of Liquid Nitrogen as Coolant in Turning of Al/SiC Metal Matrix Composites (AMMC)". Advanced Materials Research 893 (febbraio 2014): 341–45. http://dx.doi.org/10.4028/www.scientific.net/amr.893.341.

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This paper presents the results of an experimental investigation on the turning of Al/SiC (LM-13) composite using Cryogenic Liquid Nitrogen (LN2) as coolant. The influence of machining performance parameters such as cutting force, cutting temperature and surface finish were investigated under wet and cryogenic machining. The results proved that the application of cryogenic LN2coolant reduced the cutting temperature and the cutting force for about 19 to 30% and 24 to 35% respectively. The surface finish of the machined part is about 10 to 23% better than in the conventional coolant. Thus it was proved that the application of cryogenic coolants reduced the cutting force and temperature which resulted in an appreciable improvement in surface finish in machining of Al/SiC MMC.

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49

Selvarasu, Sakthi. "Influence of MgO & SiC on Mechanical and Wear Characteristics of AA6061 Hybrid Matrix Composites Synthesized by Stir Casting". Journal of Applied Research and Technology, n. 2 (27 aprile 2023): 162–68. http://dx.doi.org/10.22201/icat.24486736e.2023.21.2.1618.

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Aluminium alloy related to Metal Matrix Composites (AMMC’s) have been achieve enormous comprehensive acknowledgment for aerospace and structural applications, due to its excellent corrosion resistant, good wear resistant, high strength and light weight. In this paper, the experimental study deals with investigation influence of reinforcement (Magnesium oxide and Silicon Carbide) particles on various mechanical properties of aluminium alloy (Al 6061). AMMC was fabricated by stir casting method. The exsitu method was used to fabricate because of its less complexity. The MMC specimens with different weight percentage of reinforcement particles such as 3%, 6% and 9% were prepared. After the fabrication, the ingots were machined for preparation of test samples. The tensile, compression, Impact and hardness test were taken to study the mechanical properties and effect of varying weight percentage of reinforcements. As the outcome, the tensile and compression strength were progressively increase with addition of magnesium oxide and silicon carbide.

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50

Bubba, Tatiana A., Fernando Moura e Mirjeta Pasha. "Preface". Applied Mathematics for Modern Challenges 1, n. 2 (2023): i—ii. http://dx.doi.org/10.3934/ammc.2023013.

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