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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 observe..... 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

Bianca Pizzorno Backx*

DOI : 10.32474/MAMS.2020.03.000159

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A threat is taking over the world today. SARS-CoV-2 is a virus that spread throughout the planet, behaviorally changing world society. Humanity seeks alternatives to increase the physical barrier associated with the protection of homemade masks.Viruses, which have a semantic origin in the Latin, “toxin” or “poisonous”, are infectious agents that mostly assume a nanometric scale, with a size around 20-300 nm in diameter.An abiotic material, capable of inhibiting the spread of viruses is indispensable. Understanding the virus’s adhesion to the surface of the textile is very important for the choice of the best tissue, which has less adhesion of the virus to the surface. This minimization of virus adhesion can be promoted by the modification of surface characteristics of the textiles. The addition of nanostructures is capable..... ReadMore

RandbaranE*, DayangL, Zahari R, Sultan MTH and Mazlan N

DOI : 10.32474/MAMS.2020.03.000158

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With today’s growing interest toward composite materials and their augmentation as part of integrated business from aerospace engineering, medical applications and others, which are getting increasing dependency on composite materials in recent operations. However, the most sophisticated composite materials still need to rely on the other integrated sub-sets of components. On the other hand, there certain limitation and flaws that exist within composite materials’ component that can cause and error to grow way beyond control and can impact its main master component. These sorts of limitation and flaws also would impact the engineering targets from perspective of resiliency built into the daily operations that is also pointed it out in current article...... ReadMore

Bahman Zohuri*, Farhang Mossavar Rahmani

DOI : 10.32474/MAMS.2020.03.000157

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Companies such as Intel as a pioneer in chip design for computing are pushing the edge of computing from its present Classical Computing generation to the next generation of Quantum Computing. Along the side of Intel corporation, companies such as IBM, Microsoft, and Google are also playing in this domain. The race is on to build the world’s first meaningful quantum computer-one that can deliver the technology’s long-promised ability to help scientists do things like develop miraculous new materials, encrypt data with near-perfect security and accurately predict how Earth’s climate will change. Such a machine is likely more than a decade away, but IBM, Microsoft, Google, Intel, and other tech heavyweights breathlessly tout each tiny, incremental step along the way. Most of these milestones involve packing more quantum bits, or..... ReadMore

Bouaziz O*, P Barges

DOI : 10.32474/MAMS.2020.03.000156

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For High Strength Low Alloy (HSLA) steels or for age-hard enable steels (miraging) the strengthening by precipitation is done before forming operation to increase the yield stress as much as possible. In this publication the advantages of a hardening thermal treatment after forming operation are investigated in a low-cost age-hard enable steel Fe-Si-Ti consistent with automotive application...... ReadMore

Lawrence Chukwuka Edomwonyi-Out*

DOI : 10.32474/MAMS.2020.03.000154

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The present investigation deals with the determination of the physio-chemical properties of two commercial grade samples of local gums (Gum Arabic and Natural Rubber Latex (NRL)). The results revealed that the gum samples have high melting point that indicate thermal stability at room and moderate temperatures. The gum samples have about 95 % carbohydrate content and a corresponding high internal energy and can serve as a source of energy. The rheology of the samples revealed shear-thickening characteristics with gum Arabic being thixotropic and pseudo-plastic in nature while NRL was observed to be anti-thixotropic and rheopectic. Further results from the moisture absorption, contact angle and Fourier Transform Infrared Radioscopy (FTIR) analyses gave better insight into their hydroscopic behaviours. Gum Arabic has excellent water a..... ReadMore

Styrkas AD*

DOI : 10.32474/MAMS.2020.03.000153

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Study focuses on the basis of knowledge the mechanism of the process βSn  αSn for use it to analysis of important material for science and technology. The possibility of ultra-high purity Sn to analyse by measuring the rate (V) of the allotropic changing (V βSn  αSn) is investigated..... ReadMore

Yan Zhang*, DeShui Yu, JianPing Zhou, DaQian Sun and Hong Mei Li

DOI : 10.32474/MAMS.2020.03.000152

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Laser welding of TC4 Ti alloy to NiTi alloy has been applied using pure Cu as an interlayer. Mechanical properties of the joints were evaluated by tensile tests. Based on avoiding the formation of Ti-Ni intermetallics in the joint, three welding processes for Ti alloy-NiTi alloy joint were introduced. The joint was formed while the laser was acted on the Cu interlayer. Experimental results showed that Cu interlayer was helping to decrease the Ti-Ni intermetallics by forming Ti-Cu phases in the weld. The average tensile strength of the joint was 216 MPa...... ReadMore

Christos Beretas*

DOI : 10.32474/MAMS.2020.03.000151

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Cyber hybrid warfare has been known since antiquity; it is not a new terminology nor a new practice. It can have an effect even more than a regular conventional war. The implementation of the cyber hybrid war aims to misinform, guide and manipulate citizens, disorganize the target state, create panic, overthrow governments, manipulate sensitive situations, intimidate groups, individuals and even shortened groups of the population, and finally to form an opinion according to the enemy’s beliefs...... ReadMore

Abhinav Gauli*, Shivesh Shrestha and Sujal Lama

DOI : 10.32474/MAMS.2020.02.000150

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Nepal is rich in fresh water with more than 6,000 rivers, including that originated from the Himalaya. Being rich in water resources, it has the potential of producing more than 83,000 MW of energy. However, currently Nepal has only harnessed 1.2 % of its capacity. Besides, a Kulekhani (60 MW) all other hydropower plants in Nepal are of run of river type. Such plants are being exclusively used for producing electricity and undermining its potential of multiple use...... ReadMore

Anupam Kumar, Ramratan* and Rohit Kumar

DOI : 10.32474/MAMS.2020.02.000149

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In this experiment short flax fiber pulp is the natural fiber component chemically treated with alkaline solutions. Six specimens will be prepared in different volume percentage of flax fiber pulp and epoxy resin in order to get more accurate results. In this study it has been aimed to use flax fibres in composite materials and to study the mechanical properties of the produced samples...... ReadMore

Moslem Mansour Lakouraj*, Azita Alipour, Mohsen NajafiRoudbari and Reza Ojani

DOI : 10.32474/MAMS.2020.02.000148

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A novel biomaterial based on hydrolyzed pectin(HP)/polyaniline(PA)/graphene oxide(GO) has been prepared via chemical polymerization method. The SEM analyses revealed a rod-like and laminated morphology for NH-mGO@HP and NH-mGO@HPPA nanocomposites. Higher thermal stability for NH-mGO@HP-PA was obtained than other samples. Biosensor was designed via electrodeposition of NH-mGO@HP-PA nanocomposite on carbon graphite electrode. Biosensor activity showed a considerable increase in oxidation current by the nanocomposite. The NH-mGO@HP-PA indicated higher electrical conductivity compared to pure PA...... ReadMore

Xiangying Guo, Xiangyang Sun, and Dongxing Cao*

DOI : 10.32474/MAMS.2020.02.000147

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The two-dimensional phononic crystal structures of W-silicone rubber are designed here for the low-frequency vibration absorption by applying both the plane wave expansion method and finite element method. The band structures of phononic crystal are calculated and some special phenomena in the band structures are discussed, such as the Dirac point and the degenerate state near the Dirac point and so on. Moreover, the main deformations of different modes for the structure are given, which indicated that the stress concentration is easy to occur in joint parts of the matrix and scatter. Furthermore, the influence of different parameters on the band gaps of the phononic crystal is discussed by finite element method, including the density ratio and the Young’s modulus ratio. At last, the defect state of two-dimensional phonon..... ReadMore