|#11 2017||#12 2017|
While the submitted papers are being reviewed, MMSE journal posts corresponding abstracts on this webpage. In the Status field MMSEJ posts up-to-date information about paper status.
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Study of Long Term Antropogenic Changes by Using Landsat Satellite data and the Remote Sensing GEOBIA Analysis Method (Case Of Syr-Darya Province, Uzbekistan)
ABSTRACT. In recent years many negative changes on earth appeared after anthropogenic impacts. Solutions to the problems of the environment require a quick study of the problem , proper conclusions and safe and useful measures. This article attributes the issue of “How fast and ecological changed land surface of Syr-Darya region during past 50 years. Study nature condition in this area”. We analysed Landsat archive images in order to analyse this changes. With Landsat MSS, TM, ETM and OLI data from 1972, 1982, 1998, 2001 and 2014 land use and land change could be reconstructed in the Syr-Darya Province of Uzbekistan, Central Asia. Classification trees were generated by using eCognition Developer 9 software and the GEOBIA (Geographic Object Based Image Analysis) method. The accuracy of this analysis is verified by using field and administration data. Results show that the accuracy of classification is very high. We found that during the past 50 years natural area in the Syr-Darya Province decreased.
Keywords: land use change, Landsat imagery, NDVI (Normalized Difference of Vegetation Index), Syr-Darya, GEOBIA (Geographic Object Based Image Analyse), eCognition, biodiversity
A Fuzzy Approach to Optimize the Surface Roughness and Kerf Width in WEDM of AMMC
ABSTRACT. Wire Electrical Discharge Machining (WEDM) endorsed sensation in the production of newer materials, especially for the aerospace and medical industries. Using WEDM technology, convoluted cuts can be made through difficult-to-machine electrically conductive components with the high degree of accessible accuracy and the fine surface quality make WEDM priceless. In other hand Aluminum Metal Matrix Composites (AMMCs) are the precise materials for marine, automobile, aerospace, defense, and sports industries which are difficult to cut by conventional methods of machining. In this paper an optimal set of material and machining parameters is derived using fuzzy approach. For this, AMMC samples are produced as per the taguchi experimental design by considering combined material and wire EDM parameters and machined using wedm machine. The obtained responses such as, surface roughness and kerf width are optimized using fuzzy approach.
Keywords: wire EDM, AMMCs, surface roughness, kerf width, fuzzy logic
Enhanced Mechanical Performance for Nacre-Inspired Polyimine Composites with Calcium Carbonate Particles
ABSTRACT. Polyimine is a novel functional thermoset material with several attractive functions. Yet the mechanical properties of polyimine-based composites have been rarely investigated. In this work, calcium carbonate (CaCO3), a cheap and commonly used reinforcing material, has been chosen as the reinforcing filler to form composites with polyimine through heat-pressing under mild conditions to mimic natural nacre. Elemental mapping shows that CaCO3 particles are evenly distributed in the continuous network of the polyimine matrix. Then thermal analyses and mechanical measurements of hardness, tensile strength, toughness, bending strength, and impact strength have been conducted to characterize the properties of the resultant polyimine composites. The fracture surfaces of the specimens after tensile testing have also been examined by scanning electron microscopy (SEM). The polyimine composites with CaCO3 particles demonstrate remarkable enhancement on multiple mechanical features, especially on tensile properties. More importantly, the polyimine composites fabricated with 6 wt% of CaCO3 particles show simultaneous increases of tensile strength and toughness, which are 56% (from 35.75 to 55.79 MPa) and 110% (from 112.82 to 236.54 MJ/m3) respectively in comparison with the polyimine matrix. The work presented herein affords a facile and low-cost approach to enhance the mechanical properties of polyimine material for more practical applications.
Keywords: mechanical properties, polymer composites, polyimine, calcium carbonate (CaCO3), bio-inspired. reinforcement, nacre
Enhanced, Efficient End-to-End Voice Encryption Using A5/3RC6 over GSM Network
ABSTRACT. In recent years, Telecom Company has experienced an increment in numbers of the user connected with GSM service. The increase in the traffic network will increase the security issue for any individual while transferring the information over the GSM channel. There may be a chance that some unauthorized person can intercept your information. To overcome with this type of problem several researchers used traditional encryption technique for encrypting the information while sending information over the communication channel. There are several conventional encryption algorithms are available such as A5, A5/1, A5/3, Kasumi (A5/3K), and Rijndael Kernel (A5/3R) etc. but the drawback of this technique is the size of the key and static number of rounds. So, for a large block size of information, the performance of these methods are degraded. We like to propose a hybrid A5/3 and RC6 based encipher and decipher algorithm also called (A5/3RC6) which encrypt the information over GSM network. The comparative performance analysis is done with the Kasumi and Rijndael algorithm and proposed A5/3RC6 algorithm.
Keywords: Kasumi Algorithm, Rijndael Algorithm, GSM, RC6
Growth and Characterization of organo-metallic single crystals of (HCLPTM) Heptachloro (L-Proline) TetraMercury (II)
ABSTRACT. A new promising organo-metallic nonlinear optical material, was synthesized and single crystals of HCLPTM were grown from solution by slow evaporation technique. Single-crystal X-ray diffractometer was utilized to measure unit cell parameters and to confirm lattice parameter. The powder X-ray diffraction pattern of the grown HCLPTM has been indexed. The optical transmittance window and the lower cutoff wavelength of the HCLPTM have been identified by UV–Vis–NIR studies. The modes of vibration of different molecular groups present in the sample were identified by the FTIR spectral analysis. Dielectric measurements were carried out at various temperatures at frequency. The mechanical strength of the crystal was analyzed by Vickers hardness test. The second harmonic generation efficiency (SHG) was evaluated both theoretically and experimentally to understand the NLO activity of the grown crystal.
Keywords: solution growth, single XRD, powder XRD, UV, FTIR, dielectric measurements, AC conductivity, microhardness, NLO
Effect of Ultraviolet Radiation on Jute/E-glass fiber Reinforced Polymer Composites
ABSTRACT. This work investigates the mechanical and aging properties of E-glass fiber reinforced by jute fiber hybrid composites. The harmful effects of weather conditions are simulated and they are utilized to predict the durability of materials used outdoors. Rain and humidity are also be simulated with a condensation system and/or water spray. The damaging effects of sunlight are simulated by UV-fluorescent lamps. UVB lamp ranges from 280-315 nm are deployed to expose in hybrid composite and variations in tensile tests are determined for 50, 75 and 100 hrs. The mechanical properties as a function of reinforcement content are affected which are reflected in the values of the tensile modulus and strength as well as impact resistance and hardness.
Keywords: E-glass, Jute fiber, UVB lamp, tensile test
Structural and Dielectric Properties of Mg(1-x)CaxTiO3 (x=0.7 & 0.8) Ceramic Materials
ABSTRACT. Calcium Magnesium titanate ceramic materials with the molar formula Mg(1-x)CaxTiO3 in which the x varies from 0.7 & 0.8 were synthesized by conventional Solid State Reaction method. The XRD pattern revealed that the samples exhibit Orthorhombic structure. The microstructure and surface morphology for the samples was studied by SEM. The elemental composition was studied by EDAX. The dielectric response of both samples was measured by HIOKI 3532-50 LCR HiTESTER in the frequency range of 1KHz-1MHz from room temperature to 3500C. These samples find applications in capacitors, microwave antennas, stainless steel electrodes and data storage devices.
Keywords: Calcium Magnesium Titanate, Solid State Reaction Method, dielectric response, XRD
Status: Accepted. Minor revision required
Investigation of Crack Effect on the Behavior of Steel Plate Shear Walls
ABSTRACT. Several experimental tested have reported fracture on the corner of Steel Plate Shear Walls (SPSW) during testing. Because no comprehensive studies have performed to reveals the effect of crack on the behavior of SPSW, numerical investigations carried out into the effect of crack and its growth on the seismic behavior of SPSW in this paper. The numerical method used in this study is extended finite element method based on cohesive crack approach by utilizing ANSYS and ABAQUS software. Static and quasi-static analyses were performed to evaluate the effect of crack and its growth on lateral behavior of system. Both nonlinearities of material and geometry were considered. Numerical results indicated that small initial crack does not considerable effect on the behavior of SPSW. Although, long initial crack does not considerable effect on R-factor, it could not be applied as a lateral resisting in seismic zone due to SPSW rupture by crack length Moreover, the horizontal crack is more effective than vertical crack.
Keywords: steel shear wall, crack, seismic behavior, response modification factor, extended finite element method
Status: Accepted. Minor revision required
Especially the Transformation of Austenite in High-Strength Cast Iron during Processing With Continuous Cooling
ABSTRACT. The peculiarities of the transformation of austenite in high-strength cast iron with spherical-eminent graphite when machining with continuous cooling. The possibility of obtaining a bainite structure economically-alloyed with Nickel and copper and molded in a metal mold of high strength cast iron with continuous cooling. It is established that in high-strength cast iron processed by beynit, graphite inclusions should have a spherical shape. The amount of vermicular graphite may be in the range of 10-20%.
Keywords: high-strength cast iron, spherical graphite, the transformation of austenite, economical alloying, chill casting, heat treatment, structure, austenite, beynit, properties
Design Optimization to Mitigate Fretting Fatigue in Dovetail Joint of Aero Engine
ABSTRACT. Dovetail joint of aeroengine compressor is a critical component because of complex loading condition in the form of centrifugal, thermal, vibration and bending loads. Fretting fatigue is most likely to occur in the dovetail joint resultant into small amplitude displacement of few micrometers. This leads to degradation of the material in the form of fatigue strength and corrosion. This study is devoted to obtain optimal condition of geometrical parameters such as coefficient of friction, flank length and flank angle in order minimize the fretting fatigue parameters such as von-Mises stress, deformation, contact pressure and sliding distance. In order to carry out the study solid modeling and nonlinear static structural analysis was performed using CATIA V5R19 and ANSYS workbench 14.5 software tool at different combination of input parameters such as coefficient of friction, flank angle and flank length. Optimization of the design was conducted using response surface methodology (RSM) and grey relational analysis (GRA). The response surface methodology predicted the optimum setting at coefficient of friction 0.35, flank angle 65° and flank length of 12 mm in order to minimize fretting fatigue effect.
Keywords: dovetail, GRA, fretting fatigue
On the Quantification of the Constraint Effect Along a Three-Dimensional Crack Front
ABSTRACT. Elbows with a shallow surface cracks in nuclear pressure pipes have been recognized as a major origin of potential catastrophic failures. Crack assessment is normally performed by using the J-integral approach. Although this one-parameter-based approach is useful to predict the ductile crack onset, it depends strongly on specimen geometry or constraint level. When a shallow crack exists (depth crack-to-thickness wall ratio less than 0.2) and/or a fully plastic condition develops around the crack, the J-integral alone does not describe completely the crack tip stress field. In this paper, we report on the use of a three-term asymptotic expansion, referred to as the J-A2 methodology, for modeling the elastic-plastic stress field around a three-dimensional shallow surface crack in an elbow subject to internal pressure and out-of-plane bending. The material, an A 516 Gr. 70 steel, used in the nuclear industry, was modeled with a Ramberg-Osgood power law and flow theory of plasticity. A finite deformation theory was included to account for the highly nonlinear behavior around the crack tip. Numerical finite element results were used to calculate a second fracture parameter A2 for the J-A2 methodology. We found that the used three-term asymptotic expansion accurately describes the stress field around the considered three-dimensional shallow surface crack.
Keywords: nonlinear fracture mechanics, constraint, nuclear pressure pipe, asymptotic stress fields
Tribological Analysis of AISI/SAE 4340 Steel Submitted to Laser Carbonatation
ABSTRACT. The SAE 4340 steel is designed to operate on large structures that require high mechanical properties and good resistance to fatigue, since the steel to possess such characteristics, allows the use of thinner plates and so, this results in final structures with reduced weight. It is widely used by the aerospace industry in applications such as aircraft landing gears and the Brazilian satellite launch vehicle (VLS), among others. This work aims to evaluate the tribological properties of 4340 steel pair, initially submitted to heat treatment of hardening (quenching) and tempering, and aluminum bronze alloy 630, used in landing gear of aircraft. It was studied the behavior of these structures after being subjected to the treatment of steel surface by laser carbonatation, as a way to improve its performance with respect to friction and wear. In this study, was chosen the test pin-disc type to simulate the real situation of wear. The discs were made from AISI/SAE 4340 steel and pins were made of aluminium bronze alloy 630. Microstructural analyses were undertaken of the structures and compound layers formed due to surface treatment. After the tests of wear surface observations were made through optical microscopy and profilometry, Vickers hardness, and X-ray diffractometry. Microstructural changes occurred due to interaction between the contact surfaces during slid tests. In the tests we used three test speeds: 0.5; 1.0 and 1.5 m/s. It was possible to calculate the wear rate for each studied pair and speeds. In general, it was noted that the mechanisms of wear detected are similar for all conditions of the surface of the discs. The images show that the pin particles are bent over the disc, in the form of layers, showing the mechanism of adhesion. The laser carbonatation created a carbon-rich layer with the presence of graphite which contributed to reduce the friction coefficient and pin wear, mainly, for the 0.5 and 1.0 m/s.
Keywords: AISI 4340, aluminum bronze alloy 630, laser carbonatation, wear, friction, fatigue
Status: Accepted. Minor revision required
Understanding the Nature of Wet Air Deposition on Rooftops in Uyo Metropolis
ABSTRACT. The work titled Understanding the Nature of Wet Air Deposition on Rooftops in Uyo Metropolis was Carried out by determining the extent of air pollution in four different places in Uyo metropolis. Attair 5X was used to determine the gaseous pollutants in the wet air, while filtration technique using High Volume Sampler was used to determine the suspended particulates in the air, and the concentration was calculated in mg/l over a 24hrs period. The composition of the deposition on the rooftops was analyzed using EDX-X-Ray Fluorescence (EDX-XRF) and the characterization of the deposit was done using Scanning Electron Microscope (SEM). The result of the work showed that gas pollutants existed in all the four stations but were not to the level of health concern since air quality standard specifications were not exceeded. However, impact on rooftop was noted since SO3 was in the composition of the deposit on the rooftops. The suspended particulate matter exceeded air quality standard value of 200 µg/m3 in all the four stations, and so was of both health and environmental concern since it influenced the deposition on the rooftops. The SPM composition elements were also found in the composition of the deposits on the rooftops. The dark-black deposit on the rooftop was characterized by SEM and the micrograph showed areas of high and low deposition on the roofs. The study concluded that a better understanding of the nature of wet air deposition on rooftops in Uyo metropolis has now been established.
Keywords: wet air, nature, pollutants, particulates, deposition, rooftops, Uyo Metropolis
Nanoparticles Effect on Roof-Top Coloration: an Attempt at Understanding the Nature of Dry Air Deposition on Rooftops in Uyo Metropolis
ABSTRACT. The study Nanoparticles Effect on Roof-Top Coloration: An Attempt at Understanding the Nature of Dry Air Deposition on Rooftops in Uyo Metropolis has been extensively undertaken. The study considered four different study areas in Uyo metropolis viz station 1 (University Main campus), station 2 (Use Offot on Nwanniba road), station 3 (:Ikot-Okubo on Abak road) and station 4 (Mbaibong on Oron road ). Dry air sampling was carried out in the four stations using Attair 5x, and the condition of the roofs were noted and examined. The samples from the roofs were taken for SEM micrographs and scraped material from the roof was analysed using EDX-X-Ray Fluorescence. The suspended particulate matter in the dry air in all the four stations was also determined using High Volume Sampler. The various particle sizes of the SPM from the dry air which ranged from nano to micro –sizes were digested and analysed for some selected elements which included lead, iron, cadmium, zinc, copper, and sodium. The study revealed the nature of pollutants from the dry air in the four stations to be gaseous pollutants and suspended particulate matter (SPM). From the result of the work it was established that the SPM from the dry air had effect on the rooftops of buildings in Uyo metropolis as both the nano-size and micro-size of the SPM from the dry air were deposited on the rooftops leading to the coloration (dark-black) of the rooftops. The composition of the sampled dry air and the SPM was compared with that of the dark- black material to establish that the dark black deposit was actually from the dry air. The study also noted that the composition of the SPM may have some health implications since the lead content in station 3 was higher than specification from air quality standard of 0.00038 ppm. The scanning electron microscope micrograph of the rooftops, show the dark- black deposit as it covers the roof, with dark areas representing where the deposit was thick on the roof, and shining-light areas representing where the deposit was thin on the roof.
Keywords: dry air, particulates, nano-size, inhalable particles, rooftops, nature
Vibration Optimization of a Two-Link Flexible Manipulator with optimal input torques
ABSTRACT. This paper is concerned with the optimal path planning for reduction in residual vibration of two- flexible manipulator. So after presenting the model of a two-link flexible manipulator, the dynamic equations of motion were derived using the assumed modes method. Assuming a desired path for the end effector, the robot was then optimized by considering multiple objective functions. The objective functions should be defined such that in addition to guaranteeing the end effector to travel on the desired path, they can prevent the undesirable extra vibrations of the flexible components. Moreover, in order to assure a complete stop of the robot at the end of the path, the velocity of the end effector at the final point in the path should also reach zero. Securing these two objectives, a time-optimal control may then be applied in order for the robot to travel the path in the minimum duration possible. In all the scenarios, the input motor torques applied to the Two-Link are determined as the optimization variables in a given range. The optimization procedures were carried out based on the GA and BFGS algorithms, and the results are then compared. It is observe that the BFGS algorithm was able to achieve better results compared to GA running a lower number of iterations. Then the final value of the objective function after optimization indicates the decrease in the vibrations of the end effector at the tip of the flexible link.
Keywords: optimization, two-link flexible manipulator, path planning, vibration, genetic algorithm (GA), Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithm
Temperature Dependence of Copper Diffusion in Different Thickness Amorphous Tungsten/Tungsten Nitride Layers
ABSTRACT. The amorphous W/WN films with various thickness and excellent thermal stability were successfully prepared on SiO2/Si with evaporation and reactive evaporation methods. In annealing process, the amorphous W/WN barrier crystallized and this phenomenon are supposed to be the start of diffusion Cu atoms through W/WN barrier into Si. With occurrence of the high resistive Cu3Si phase, the W/WN loses its function as a diffusion barrier. The primary mode of Cu diffusion is diffusion through grain boundaries that form during heat treatments. Results shows that the failure temperature increased by increasing the W/WN film thickness from 10 to 30 nm but it didn’t change by increasing the W/WN film thickness from 30 to 40 nm. The 10 and 40 nm W/WN films are good diffusion barrier up to 800°C while the 30 nm W/WN film failed at 900°C (which is 100°C higher than the other) and shows superior diffusion barrier properties.
Keywords: diffusion barrier, grain boundary diffusion, diffusion mechanism, Cu silicide, grain growth
Designing in Labview Adaptive Filter Acoustic Signals for System Monitoring Control Objects in a Strong Technological Noise
ABSTRACT. Program adaptive data processing have the connection parameters of the transfer function of the system processing input and output signals, allowing you to self-adjust to the optimum signal processing. For the selection of acoustic emission, signals on a background of strong acoustic noise used a specially designed LabVIEW software dual-channel adaptive filter.
Keywords: data processing in LabVIEW, adaptive filter
Development of Virtual Tools to Design in Labview Radial Basis Neural Networks (RBF) Intelligent Data Processing
ABSTRACT. The article discusses the development of virtual tools for the design of radial basis neural networks (RBF), which are used for recognition and classification of acoustic emission signals in their intellectual processing.
Keywords: virtual neuron, radial basis neural network (RBF), acoustic emission, detection and classification of signals
Status: Accepted after revision
Control in Labview Acoustic Piezo Buzzer Robot on Hardware Platform Arduino
ABSTRACT. The report presents remote control acoustic piezo robot into widespread at the present time the hardware and software platform Arduino UNO ATmega328p processor with a clock frequency of 16 MHz. In LabVIEW programmed acoustic piezo buzzer to the Arduino robot to create a diagnostic simulator of acoustic emission signals during calibration of the acoustic sensors of the monitoring system. The software part of the control system was designed in LabVIEW 2016 using NIVISA additional modules and extensions to work with boards Arduino – LabVIEW interface for Arduino, Arduino IDE and X-CTU.
Keywords: piezo, Arduino UNO, acoustic emission, calibration of sensors of acoustic emission
Status: Accepted. Minor revision required
Status: Rejected. 90 % Plagiarism has been detected
Status: Accepted. Minor revision required
Status: Accepted. Minor revision required
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