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Pondi P, Achebo J and Ozigagun A*

DOI : 10.32474/MAMS.2021.03.000179

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One of the limitations associated with response surface methodology (RSM) is that an understanding of the trend and pattern of the input variable is required for every model. It means therefore that the performance of RSM is dependent on the beauty of experimental design. Therefore, to predict the response variables beyond the scope of experimentation, predictive model such as artificial neural network (ANN) is required. The focus of the study is to apply artificial neural network for the prediction of tig process parameter such as Brinell hardness number (BHN), heat input (HI) and cooling rate (CR) which is required for eliminating post weld crack formation, and stabilizing heat input in mild steel weldment. The key input parameters considered in this work are welding current, welding voltage and welding speed while the response or measu..... ReadMore

Alexis Tigreros and Jaime Portilla*

DOI : 10.32474/MAMS.2021.03.000178

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Organic fluorescent compounds are playing and will play an important role in scientific research in the next decades owing to their potential technological applications in the fields of chemo sensors, biological imaging, and optical evices [1]. With hundreds of metal-free dyes published every year an immediate question arises: is there any room for new organic fluorophores? To find an appropriate answer, we should analyze the present and past of organic fluorophores. On one hand, conventional organic fluorophores like pyrene, anthracene, or perylene are essentially non-fluorescent in the solid-state, which limits their usage in practical applications..... ReadMore

Bahman Zohuri*

DOI : 10.32474/MAMS.2021.03.000177

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With recent renewal interest in survivability, radiation hardening against cold or hot x-ray as well as high power laser energy among defense companies and military communities, radiation shielding of military equipment becomes an imperative task and requirement. Materials used in radiation shielding is one way to go to protect any vulnerable digital circuits in form of an integrated circuit, and consequently selecting of such ICs for a radiation environment also becomes a necessity as part of survivability requirements. Thermomechanical properties of materials as part of shielding are also going to play a huge role as part of protection of these ICs as well. With most countries getting involved with their nuclear arsenal development, protection of our assets in space or on ground such as electric circuits and grids is another issue that ..... ReadMore

Jacek Karpiesiuk*

DOI : 10.32474/MAMS.2021.03.000176

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The light surface heating/cooling system (LSH/CS) creates a structure in which the surface of the thermal insulation is very often covered with metal heat diffusers. These are steel sheets, aluminum sheets, or aluminum foils with various thicknesses. Different types of floors are glued directly to them, no required screeds. For this purpose, you can use various types of adhesives dedicated by manufacturers to glue the thermal insulation layer with aluminum foil or metal heat diffusers with the floor. The most important parameter of the glued layers is their strength perpendicular to the face. It may depend on the influence of the temperature. To check this, various types of adhesives were tested by being put between thermal insulation and a layer of aluminum foil, between tiles and foil heat diffusers, as well as tiles and XPS boards with..... ReadMore

Furong Cao*, Bijin Zhou and Renjie Liu

DOI : 10.32474/MAMS.2021.03.000175

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A new Mg-7.28Li-2.19Al-0.1Y alloy has been fabricated by rolling, and the rolled and annealed sheets were subjected to laser surface treatment. The microstructure and mechanical properties were investigated. The rolled alloy demonstrates ultimate tensile strength (UTS) of 299.48 MPa and elongation-to-failure (EL) of 15.71%; the annealed alloy demonstrates the UTS of 211 MPa and EL of 26.5%; laser treated rolled sample exhibits the UTS of 215 MPa and EL of 21.96%, and laser treated annealed sample exhibits the UTS of 205 MPa and EL of 19.15%. Laser treatment refines significantly the grains of Mg-7.28Li-2.19Al-0.1Y alloy, but laser treatment does not improve its mechanical properties due to its role of softening in the present alloy. The laser treatment softening phenomenon in this alloy is the first report of laser treated Mg-Li alloy..... ReadMore

Mohsen Mhadhbi*

DOI : 10.32474/MAMS.2021.03.000174

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In this work, a nanostructured TiC powders were produced by mechanical alloying (MA) through high energy ball milling from a mixture of elemental powders of titanium (Ti) and graphite (C) in argon atmosphere. MA process was performed for 20 h in a planetary ball mill (Fritsch Pulverisette 7) at room temperature at a ball-to-powder weight ratio of 70:1. Microstructure and morphology of the samples were investigated by using X-ray diffraction (XRD), laser granulometry, scanning electron microscope (SEM), and transmission electron microscope (TEM). XRD studies revealed that in the times more than 15 h of MA all the raw materials were changed to the desired materials. Results showed that nanocrystalline TiC, with about 10 nm, is synthetized by reaction between Ti and C atoms...... ReadMore

Rina B Binyamini, Edith Laux, Herbert Keppner and Jean Paul Lellouche*

DOI : 10.32474/MAMS.2021.03.000173

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Both pure silica (SiO2 ) nanoparticles (SNPs) and functionalized hybrid triclosan (TCS)/silica nanocomposites (T-SNCs) were deposited onto nonfunctional Parylene C films using a novel, readily executed, one-step decoration method. Unlike previously known methods, this functionalization method of Parylene C films required neither any binding agent nor sophisticated equipment/ devices. The SiO2 -based NPs anchored onto Parylene C substrates were formed via a common base-catalyzed hydrolytic sol-gel method. Regarding the mechanism, it has been assumed that the SiO2 phase precursor (Si(OC2 H5 )4 ), tetraethoxysilane (TEOS), was first adsorbed and 2D polymerized onto the parylene C film due to hydrophobic interactions that served as an anchor mechanism for further corresponding NPs growth [1] This assumption was investigated by co..... ReadMore

Yan Zhang*, Jian Ping Zhou, DaQian Sun and XiaoYan Gu

DOI : 10.32474/MAMS.2021.03.000172

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TiNi alloy has shape memory and pseudo-elastic properties, excellent corrosion resistance and good biocompatibility, it provides promising solutions to solve the problems in various applications such as aerospace, atomic energy, microelectronics, and medical equipment [1-2]. Ti alloy has excellent comprehensive properties, such as high specific strength, high specific modulus, hardness, corrosion resistance and high damage resistance [2,3]. Therefore, it will be widely used in aerospace, instrumentation, electronics, chemical industry and other fields...... ReadMore

Zhang X, Deng MX, Wang CY, Zheng ZH, Liu Q*, Zhou ZZ and Xu XK

DOI : 10.32474/MAMS.2021.03.000171

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Currently, lots of research work have been conducted to exploit inorganic optical storage materials (OSMs). Despite those impressing discoveries of new OSMs, the inducing of defects or traps and the interaction between light-emitting center and charge carrier recombination center is still under debate. Herein, through sol-gel methods, a novel Ba1-xMg2 Al6 Si9 O30: xEu (BMASO: xEu) phosphor of OSMs were successfully synthesized. Fine crystallization of hexagonal phase was proved by XRD Rietveld refinement. From the thermoluminescence (TL) results, a super-broad distribution of trap level from 323-673 K was found for the sample BMASO:0.02Eu annealed in a reductive atmosphere, with a considerable TL intensity even in a high temperature region over 673 K. Because of the annealing in reductive atmosphere and part of Eu ions replacemen..... ReadMore

Bahman Zohuri*, Farahnaz Behgounia, Ziba Zibandeh Nezam and Masoud J Moghaddam

DOI : 10.32474/MAMS.2021.03.000170

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Past few decades of research around nanomaterials has brought up a new interest of research by engineers and scientists in an area known as Memory Metals or Shaping Alloys and this is the subject of this A short Review as an article presented here. Shape Memory Alloys that often called ‘Memory Metals’ are a class of metal alloys that “remember” their original physical forms and shapes. When the metals are bent or twisted from their original form or shape, they can retain their initial form, when heated to a certain level of temperature...... ReadMore

Eluozo SN* and Amanamba EC

DOI : 10.32474/MAMS.2021.03.000169

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This paper monitors the variation increase of compressive on partially replacement of copper slag with fine aggregate, the study observed the fluctuation of growth rate of the compressive strength; these were examined to generates the behaviour of the material intermesh of its reaction on strength development, the variation is from the level of compaction, placement and segregation during concrete transport and its placement, including bleeding of concrete that were thoroughly examined. The parameters developed influence based on the fluctuation from the stated parameters that reflects on the growth rates of compressive strength, the derived modeling and simulation monitor the behaviour of concrete properties in different water cement ratios and curing age, the dosage of the addictives were monitor on the simulation, the highest comp..... ReadMore

Eluozo SN* and Ebirim S

DOI : 10.32474/MAMS.2021.03.000168

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The study has expressed the rate on strength development of concrete as it partially replaced cement with silica fumes, iron slag and Rice husk Ash. Modeling and simulation were adopted to monitor the growth rate of compressive strength, the predictive values that was generated experienced gradual growth rate with slight curve to the optimum level recorded at 28 days of curing. The study monitor the system by improving on the previous work done by other experts, such improvement were carried out by predicting the compressive strength of concrete that partially replaced cement with silica fumes iron slag and Rice husk Ash at the 14 days of curing, while other existing work was carried out on experimental procedure that monitored the compressive within 7 and 28days, there is no literature that has applied this mathematical techniques ..... ReadMore

Zakarian D* and Khachatrian A

DOI : 10.32474/MAMS.2020.03.000167

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Using the pseudopotential method and the quasi-harmonic approximation, the following are calculated: the coefficient of linear thermal expansion (CLTE), the Debye temperature and their temperature dependencies. The temperature dependence of both characteristics, after approximation, is presented in analytical form. The results were compared with known tabular data. To check the reliability of the results, the calculations were carried out for pure metals as well. The difference between the calculated and tabular data does not exceed 7.3%. The presented model for calculating the CLTE of multielement alloys adequately reflects the results of thermal expansion of materials, considering such effects as phase transitions or the appearance of a second phase..... ReadMore

Ash Ahmed*, Hafiz Nadir, Colin Yates and Lee Yates

DOI : 10.32474/MAMS.2020.03.000166

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The use of lime as a binder and natural fibers as reinforcements have been in use since ancient human history. However, ordinary Portland cement and concrete have substituted these comparatively cheaper eco-friendlier materials due to their quick setting and strength parameters since the 19th century. However, their large-scale impact on the environment due to greenhouse gases emission has encouraged further research to develop novel composite materials comprising natural fibers like coconut coir and lime as partial cement substitute. In this review study, contemporary research studies conducted by different researchers were explored and has found this field quite encouraging and progressive for modern trends in construction materials. Coir is a material with great potential due to its high strength and ductility comparable to steel..... ReadMore

Zakarian D* and Khachatrian A

DOI : 10.32474/MAMS.2020.03.000165

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A method has been developed for calculating the melting temperature of materials from first principles based on the temperature dependence of the theoretical strength. An analytical regularity of the temperature dependence of the theoretical strength of materials (metals, multielement metal alloys, borides, diamond-like covalent and ion-covalent crystals, quasi-binary eutectic systems) is obtained. The resulting ratio allows one to estimate the theoretical strength of materials in the temperature range from zero to the melting point...... ReadMore

Muhammad M*, Gwarzo FS, Baso SA and Garba S

DOI : 10.32474/MAMS.2020.03.000164

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Evaluation of physicochemical parameters and heavy metals concentration of wastewater used for irrigation at Tukuntawa Radio Station was carried out. Six samples were collected from different sampling points. Levels of various physicochemical parameters such as Temperature, pH, Electrical conductivity (EC), Total Dissolved Solids (TDS), turbidity, F- , and PO3- were determined using standard analytical methods. The concentration of, Fe, Cu, Cr and Mn were determined using standard methods. The parameters analyzed are within the maximum permissible limits (MPL) recommended by Nigerian Standard for Drinking Water Quality (NSDWQ) and world Health Organization (WHO) with exception of turbidity level at all the sampling station, EC concentration at A, D, and F sampling point as well as TDS concentrations at D sampling point. The result..... ReadMore

Tessy López*, Francisco J Padilla-Godínez, Paola Ramírez and Esteban Gómez-López

DOI : 10.32474/MAMS.2020.03.000163

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Objective: To describe patient outcomes with respect to the use of Cu/SiO2-TiO2 nanoparticles embedded in a polymeric gel as treatment for post-breast cancer chronic wounds with solid calcifications. Methods: The nanoparticles were synthesized by the sol-gel method. The compound was incorporated into a polymeric gel matrix. SEM and TEM microscopy studies were carried out to evaluate grain size, morphology, and texture of the pure nanoparticles. The chronic wounds were treated by applying zinc oxide as emollient, Triticum vulgare (Italdermol®) and the Nano biocatalyst. The wound was covered with Solvaline® N dressings for the absorption of the exudate. Results: The Cu/SiO2 -TiO2 nanobiocatalyst displayed average particle size between 5 and 10 nm with high particle dispersion. Ordered arrangement of the nanoparticles was observed ..... ReadMore

Abere Dare Victor*, Oyatogun Grace Modupe, Oluwasegun Kunle Micheal, Ojo Sammy Alaba and Adeosun Adebayo Samuel

DOI : 10.32474/MAMS.2020.03.000162

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This work examined the Impact of Low Frequency Vibration during Welding and Annealing on Microstructure of low carbon steel Butt-welded Joints with a view to establishing vibration regimes and the resultant microstructures that may improve the condition of service performance as well as increasing life span of welded joints. Commercially available mild steel plates were butt-welded employing vibration and non-vibration welding conditions and subjected to heat treatment before carrying out metallographic analysis. Vibration frequencies were varied from 0 to 14.32Hz in three different steps.The mechanical performance of the weldment with reference to strength and toughness depend upon the type of microstructure of weld metal and heat affected zone. The post weld heat treatment of annealing and stress relieving tend to significantly re..... ReadMore

Eric Dimla*, Namasivayam Navaranjan, Nur Bazilah Rasyiqah Bte Abu Bakar and Nurafiqah Binti Mohd Ariffin

DOI : 10.32474/MAMS.2020.03.000161

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Titanium alloy (Ti6 Al4 V) is used for medical prosthetic devices and implants. This study investigated the effect of three types of surface treatments on fatigue and tensile properties of the metal. Representative samples were treated using polishing and chemical passivation using hydrogen peroxide and nitric acid. The surfaces of the treated and untreated samples were observed under an optical microscope and then the samples were subjected to tensile and tensile-fatigue tests using an Instron ServoHydraulic machine. The mechanically polished samples had 17% higher fatigue life than untreated samples. In contrast, the hydrogen peroxide and nitric acid treated samples had 5% and 7% lower fatigue life than untreated samples, respectively. Etched grain boundaries were observed on the surface of treated samples. It was concluded that ..... ReadMore

Furong Cao* and Xiaotong Zhu

DOI : 10.32474/MAMS.2020.03.000160

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Dislocation creep is one of creep mechanisms. Elucidating creep mechanism is beneficial to understand the nature of hightemperature creep deformation and control the slow deformation of service devices at elevated temperatures and their accuracies of dimensions. In this paper, a factor α, was proposed to determine quantitatively the mechanisms of dislocation viscous glide (solute drag creep) and climb. When α>1, dislocation viscous glide or solute drag creep dominates while when α<1, dislocation climb dominates. A calculated example was given, and a three-dimensional histogram was constructed in Al-1.44Mg-1.09Y alloy tensile at elevated temperatures. The results revealed that at 773 and 793 K and at an initial strain rate of 1.67×10-4 s-1, the ratecontrolling mechanism is dislocation viscous glide or solute drag creep, whereas und..... ReadMore