1. The paper studies electron transport through magnetic tunnel junctions using the non-equilibrium Green's function method. It models a multi-layer structure of magnetic/non-magnetic/magnetic layers.
2. Increasing the binding strength of the insulating layer increases the electron density and disruption of energy levels. A broader band connection disrupts the insulating layer more, changing it from a non-conductor to a semiconductor or even conductor.
3. The results show that electron transport can be controlled in the non-conducting layers by changing properties of the three layers to maximize the transmission function.
This is a Powerpoint for basic understanding regarding Molecular dynamics and NAMD simulation to providing basic information, schematic representation, to understanding the mechanism or process of molecular dynamics ( MD), and NAMD simulation brief discussion.
Effects of Carbon Nanotube Dispersion on the
Material Properties of Polymer Matrix Composites by Azadeh Tavousi Tabatabaei, Seyed Hossein Mamanpush* and Bahareh Tavousi Tabatabaei in Evolutions in Mechanical Engineering
Finite Element Method Linear Rectangular Element for Solving Finite Nanowire ...theijes
This paper concerned with the solution of finite nanowire superlattice quantum dot structures with a cylindrical cross-section determine by electronic states in various type of layers in terms of wave functions between structures containing the same number of barriers and wells (asymmetrical) or containing a different number (symmetrical). The solution is considered with the Finite element method with different base linear rectangular element to solve the one electron Ben Daniel-Duke equation. The results of numerical examples are compared for accuracy and efficiency with the finite difference method of this method and finite element method of linear triangular element. This comparison shows that good results of numerical examples.
A SIMPLE METHOD TO AMPLIFY MICRO DISPLACEMENTijics
A simple method to amplify the micro displacements produced by magnetostrictive effect, giant
magnetostrictive, converse piezoelectric and photo strictive effect, respectively, is reported. The device
consists mainly of two material rods with different coefficients of strains vs intensity of external fields,
which are rigidly jointed, so that the displacements created by different rods can be added directly. In
contrast with all other methods reported so far, which are all based on the principle of lever, this approach
holds some unique advantages that can be applied to respond to the electromagnetic fields with high
frequency because there is no friction caused by the relative motion between levers and furthermore, an
ideal and smooth amplification of micro displacement can be obtained with ease in principle.
On the Size-dependent Nonlinear Behavior of a Capacitive Rectangular Micro-pl...Kaveh Rashvand
This research deals with the effect of the intrinsic material length-scale parameter on the stability of a fully clamped rectangular micro-plate, which can be used as a RF MEMS resonator. A modified couple stress theory is utilized to model the micro-plate, considering the variable material length-scale parameter. The nonlinear governing equation of motion for static analysis is solved using the step-by-step linearization method (SSLM) and the static pull-in parameters, limiting the stable regions of capacitive resonators, are determined and compared to those obtained by the classical theory. The numerical results reveal that the intrinsic size dependence of materials leads to an increase in the pull-in voltage and natural frequency depending on the thickness of the micro-plate. Comparing these results to the experimental outcomes shows that utilizing the fixed material length-scale leads to unrealistic results in some manner.
Theoretical and experimental analysis of electromagnetic coupling into microw...IJECEIAES
In this paper, our work is devoted to a time domain analysis of field-to-line coupling model. The latter is designed with a uniform microstrip multiconductor transmission line (MTL), connected with a mixed load which can be linear as a resistance, nonlinear like a diode or complex nonlinear as a Metal Semiconductor Field-Effect Transistor (MESFET). The finite difference time-domain technique (FDTD) is used to compute the expression of voltage and current at the line. The primary advantage of this method over many existing methods is that nonlinear terminations may be readily incorporated into the algorithm and the analysis. The numerical predictions using the proposed method show a good agreement with the GHz Transverse Electro Magnetic (GTEM) measurement.
Characterization of Mechanical, Thermal, and Electrical Properties of Carbon ...drboon
In this paper, the mechanical, thermal and electrical properties of carbon fiber modified thermoplastic polyimide were numerically analyzed by finite element analysis. A three-dimensional model was created, in which continuous carbon fibers are aligning and paralleling to each other and uniformly distributing in the polymer matrix. The behaviors of the composites in two extreme situations, i.e., parallel or perpendicular to carbon fiber direction, were simulated. The effects of the volume fraction of carbon fiber content on the physical properties were investigated. It shows clearly that carbon fibers significantly improve the mechanical strength, and thermal and electrical conductivities. The future work includes investigation of the physical properties of the conductive network of the composites with random carbon fiber orientation, and different fillers, such as graphite, and carbon nanotubes.
This is a Powerpoint for basic understanding regarding Molecular dynamics and NAMD simulation to providing basic information, schematic representation, to understanding the mechanism or process of molecular dynamics ( MD), and NAMD simulation brief discussion.
Effects of Carbon Nanotube Dispersion on the
Material Properties of Polymer Matrix Composites by Azadeh Tavousi Tabatabaei, Seyed Hossein Mamanpush* and Bahareh Tavousi Tabatabaei in Evolutions in Mechanical Engineering
Finite Element Method Linear Rectangular Element for Solving Finite Nanowire ...theijes
This paper concerned with the solution of finite nanowire superlattice quantum dot structures with a cylindrical cross-section determine by electronic states in various type of layers in terms of wave functions between structures containing the same number of barriers and wells (asymmetrical) or containing a different number (symmetrical). The solution is considered with the Finite element method with different base linear rectangular element to solve the one electron Ben Daniel-Duke equation. The results of numerical examples are compared for accuracy and efficiency with the finite difference method of this method and finite element method of linear triangular element. This comparison shows that good results of numerical examples.
A SIMPLE METHOD TO AMPLIFY MICRO DISPLACEMENTijics
A simple method to amplify the micro displacements produced by magnetostrictive effect, giant
magnetostrictive, converse piezoelectric and photo strictive effect, respectively, is reported. The device
consists mainly of two material rods with different coefficients of strains vs intensity of external fields,
which are rigidly jointed, so that the displacements created by different rods can be added directly. In
contrast with all other methods reported so far, which are all based on the principle of lever, this approach
holds some unique advantages that can be applied to respond to the electromagnetic fields with high
frequency because there is no friction caused by the relative motion between levers and furthermore, an
ideal and smooth amplification of micro displacement can be obtained with ease in principle.
On the Size-dependent Nonlinear Behavior of a Capacitive Rectangular Micro-pl...Kaveh Rashvand
This research deals with the effect of the intrinsic material length-scale parameter on the stability of a fully clamped rectangular micro-plate, which can be used as a RF MEMS resonator. A modified couple stress theory is utilized to model the micro-plate, considering the variable material length-scale parameter. The nonlinear governing equation of motion for static analysis is solved using the step-by-step linearization method (SSLM) and the static pull-in parameters, limiting the stable regions of capacitive resonators, are determined and compared to those obtained by the classical theory. The numerical results reveal that the intrinsic size dependence of materials leads to an increase in the pull-in voltage and natural frequency depending on the thickness of the micro-plate. Comparing these results to the experimental outcomes shows that utilizing the fixed material length-scale leads to unrealistic results in some manner.
Theoretical and experimental analysis of electromagnetic coupling into microw...IJECEIAES
In this paper, our work is devoted to a time domain analysis of field-to-line coupling model. The latter is designed with a uniform microstrip multiconductor transmission line (MTL), connected with a mixed load which can be linear as a resistance, nonlinear like a diode or complex nonlinear as a Metal Semiconductor Field-Effect Transistor (MESFET). The finite difference time-domain technique (FDTD) is used to compute the expression of voltage and current at the line. The primary advantage of this method over many existing methods is that nonlinear terminations may be readily incorporated into the algorithm and the analysis. The numerical predictions using the proposed method show a good agreement with the GHz Transverse Electro Magnetic (GTEM) measurement.
Characterization of Mechanical, Thermal, and Electrical Properties of Carbon ...drboon
In this paper, the mechanical, thermal and electrical properties of carbon fiber modified thermoplastic polyimide were numerically analyzed by finite element analysis. A three-dimensional model was created, in which continuous carbon fibers are aligning and paralleling to each other and uniformly distributing in the polymer matrix. The behaviors of the composites in two extreme situations, i.e., parallel or perpendicular to carbon fiber direction, were simulated. The effects of the volume fraction of carbon fiber content on the physical properties were investigated. It shows clearly that carbon fibers significantly improve the mechanical strength, and thermal and electrical conductivities. The future work includes investigation of the physical properties of the conductive network of the composites with random carbon fiber orientation, and different fillers, such as graphite, and carbon nanotubes.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This paper present design of new type of electromagnetic damper or eddy current damper
which has advantages of no mechanical contact, higher reliability and stability, high efficiency and
compactness. By using this damper we can minimized damping of different masses and thereby damping
coefficient. The damper is composed of neodymium iron boron grade N 50 magnet .By using this damper I
found greater difference in damping when experimental result are compared with analytical result.
MAGNETIZED PLASMA WITH FERROMAGNETIC GRAINS AS A VIABLE NEGATIVE REFRACTIVE I...ijrap
The propagation of electromagnetic waves in a cold magnetized plasma with ferromagnetic grains (MPFG)
in the high frequency domain is studied theoretically. The dispersion of MPFG which is controlled by the
simultaneous characterization of the permittivity and permeability tensors. is investigated theoretically and
numerically near the resonance frequency. It is found that MPFG becomes transparent for the waves that
cannot propagate in conventional magnetized electron-ion plasma. The refractive index of the waves
propagating parallel to the applied magnetic field is found to be negative for the extraordinary wave in
certain frequency domain. The results obtained show that in a narrow band of the super-high-frequency
range near the electron cyclotron frequency, MPFG possess all the known characteristics of negative
refractive index media, which would make it as a viable alternative medium to demonstrate the known and
predicted peculiar properties of media having negative index of refraction.
The main stake is to detect a defective component or likely to become it during manufacture or inservice inspections, while improving control productivity. In this context, we develop a simulation tool of EC fastened structures testing, integrated to the ANSYS platform, aimed at conceiving testing methods, optimizing and qualifying it. The finite element method has been chosen, it is suitable for this type of problem. Various configurations have been considered for the inspection of a target with a defect in different thicknesses. Due to the impossibility to detect a defect located at a distance much greater than the skin depth δ. Indeed, the eddy currents amplitude are less than 95% of the maximum amplitude beyond a depth greater than 3 δ. We are interested in the detection of defects located at depths higher to three times the skin depth.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Propagation Behaviour of Solid Dielectric Rectangular Waveguideijsrd.com
For frequencies above 30 ghz, increasing skin depth losses in metal requires that low loss structures be made without the use of metallic materials. Hence, the importance of pure dielectrics waveguides for carrying large bandwidth signals is established. The only unexploited spectral region, Terahertz band, is now being actively explored. Moreover, metallic waveguides or antennas are dangerous when the application involves ionized gas i.e. Plasma or when there is a risk that the antenna or waveguide can be exposed to plasma. Dielectric waveguides might be the only viable solution. Here, an analytical theory has been developed for finding out the modal characteristics of a solid dielectric waveguide in guided and leaky modes.
Coexistence of Superconductivity and Itinerant Ferromagnetism in Ucogeijrap
The coexistence of BCS superconductivity and itinerant ferromagnetism in uranium based intermetallic systems is analyzed using a Hubbard Hamiltonian. To obtain the superconducting transition
temperatureTC and Curie temperatureTFM , we used the Green’s function method. The order parameter of superconductivity ( ∆ ) and ferromagnetism ( m or I) are obtained in the mean field approximation. It is found that there generally exist coexistent solutions to coupled equations of the order parameter in the temperature range ( ) T TC TFM 0 < < min , . In our model, ferromagnetism is itinerant and therefore carried by the conduction electrons. This arises from a splitting of the spin-up and spin- down band. A consequence is that the ferromagnetism and superconductivity is carried by same electrons. Expressions for specific heat, energy spectra and density of states are derived. The specific heat has linear temperature dependence as opposed to that of the exponential decrease in the BCS theory. The density of states for a finite magnetic order parameter increases as opposed to that of a ferromagnetic metal. The theory is
applied to explain the observations in uranium based intermetallic compoundUCoGe . The agreement between theory and experiments is quite encouraging.
A presentation on Coulomb-Blockade Oscillations in Semiconductor Nanostructures made by Deepak Rajput. It was presented as a course requirement at the University of Tennessee Space Institute in Fall 2008.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This paper present design of new type of electromagnetic damper or eddy current damper
which has advantages of no mechanical contact, higher reliability and stability, high efficiency and
compactness. By using this damper we can minimized damping of different masses and thereby damping
coefficient. The damper is composed of neodymium iron boron grade N 50 magnet .By using this damper I
found greater difference in damping when experimental result are compared with analytical result.
MAGNETIZED PLASMA WITH FERROMAGNETIC GRAINS AS A VIABLE NEGATIVE REFRACTIVE I...ijrap
The propagation of electromagnetic waves in a cold magnetized plasma with ferromagnetic grains (MPFG)
in the high frequency domain is studied theoretically. The dispersion of MPFG which is controlled by the
simultaneous characterization of the permittivity and permeability tensors. is investigated theoretically and
numerically near the resonance frequency. It is found that MPFG becomes transparent for the waves that
cannot propagate in conventional magnetized electron-ion plasma. The refractive index of the waves
propagating parallel to the applied magnetic field is found to be negative for the extraordinary wave in
certain frequency domain. The results obtained show that in a narrow band of the super-high-frequency
range near the electron cyclotron frequency, MPFG possess all the known characteristics of negative
refractive index media, which would make it as a viable alternative medium to demonstrate the known and
predicted peculiar properties of media having negative index of refraction.
The main stake is to detect a defective component or likely to become it during manufacture or inservice inspections, while improving control productivity. In this context, we develop a simulation tool of EC fastened structures testing, integrated to the ANSYS platform, aimed at conceiving testing methods, optimizing and qualifying it. The finite element method has been chosen, it is suitable for this type of problem. Various configurations have been considered for the inspection of a target with a defect in different thicknesses. Due to the impossibility to detect a defect located at a distance much greater than the skin depth δ. Indeed, the eddy currents amplitude are less than 95% of the maximum amplitude beyond a depth greater than 3 δ. We are interested in the detection of defects located at depths higher to three times the skin depth.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Propagation Behaviour of Solid Dielectric Rectangular Waveguideijsrd.com
For frequencies above 30 ghz, increasing skin depth losses in metal requires that low loss structures be made without the use of metallic materials. Hence, the importance of pure dielectrics waveguides for carrying large bandwidth signals is established. The only unexploited spectral region, Terahertz band, is now being actively explored. Moreover, metallic waveguides or antennas are dangerous when the application involves ionized gas i.e. Plasma or when there is a risk that the antenna or waveguide can be exposed to plasma. Dielectric waveguides might be the only viable solution. Here, an analytical theory has been developed for finding out the modal characteristics of a solid dielectric waveguide in guided and leaky modes.
Coexistence of Superconductivity and Itinerant Ferromagnetism in Ucogeijrap
The coexistence of BCS superconductivity and itinerant ferromagnetism in uranium based intermetallic systems is analyzed using a Hubbard Hamiltonian. To obtain the superconducting transition
temperatureTC and Curie temperatureTFM , we used the Green’s function method. The order parameter of superconductivity ( ∆ ) and ferromagnetism ( m or I) are obtained in the mean field approximation. It is found that there generally exist coexistent solutions to coupled equations of the order parameter in the temperature range ( ) T TC TFM 0 < < min , . In our model, ferromagnetism is itinerant and therefore carried by the conduction electrons. This arises from a splitting of the spin-up and spin- down band. A consequence is that the ferromagnetism and superconductivity is carried by same electrons. Expressions for specific heat, energy spectra and density of states are derived. The specific heat has linear temperature dependence as opposed to that of the exponential decrease in the BCS theory. The density of states for a finite magnetic order parameter increases as opposed to that of a ferromagnetic metal. The theory is
applied to explain the observations in uranium based intermetallic compoundUCoGe . The agreement between theory and experiments is quite encouraging.
A presentation on Coulomb-Blockade Oscillations in Semiconductor Nanostructures made by Deepak Rajput. It was presented as a course requirement at the University of Tennessee Space Institute in Fall 2008.
Comparison of Multilevel Inverter Topologies for STATCOM ApplicationsIJERA Editor
In this paper is to present an comparison of four different STATCOM multilevel inverter topologies which are suitable to be connected to the un-linear loads and unbalancing loads. The majority of power consumption has been drawn in reactive loads. These loads are drawn in low power factor and therefore give rise to reactive power burden in the power system. So that STATCOM controller is used to compensate reactive power, correction of power factor and elimination of current harmonics. This paper mainly focuses the analysis issues of the Cascade H-bridge, Incremental cascade H-bridge, Incremental cascade I–bridge and Incremental – reduction cascade H-bridge multilevel topologies with PWM technique for STATCOM applications; Inverter operation play a vital in STATCOM, presenting a methods for best suitable in the point of low THD, better output, cost and efficiency. MATLAB/SIMULINK results are present in this paper of multilevel inverter four topologies for STATCOM applications with Instantaneous p – q theory controller implemented.
Sanitation Coverage And Impact Of Open Defecation Free (ODF) Zone With Specia...IJERA Editor
The basic needs of people such as safe drinking water, improved hygiene and sanitation must be fulfilled for a dignified life of human being. Sanitation is one of the major components which directly impact the living standard of people. However, people in many parts of the world have not got the sanitized condition and have been living in a non-hygienic situation. About 35% (2.5 billion) populations in the world are still lacking to access improved sanitation. There are many indicators of sanitized society but toilet is considered as one of the important ones. In Nepal, around 62% households have got the facility of toilet. This indicates that 38 % of households have no access to toilets and defecate openly. As a result people have got poor hygiene and sanitation environment. In turn, the country has got the loss of NRs. 10 billion annually. The objective of this paper is to explore the knowledge on open defecation (OD). OD is being eradicated from many parts of the world. Many western countries have already been free from OD. But this problem still exists in most of the developing and under-developed countries like Nepal. Though the adverse impact of OD is very high; people are not aware. Construction of toilets by providing outside support for the ultra poor people is not the rational way of eradication of OD. Technical and financial support for toilet construction could be effective if people are aware.
Analysis of Thermal Buckling of Ceramic-Metal Functionally Graded Plates Usin...IJERA Editor
Functionally graded materials (FGMs) are microscopically inhomogeneous spatial composite materials,
typically composed of a ceramic-metal or ceramic-polymer pair of materials. Therefore, it is important to
investigate the behaviors of engineering structures such as beams and plates made from FGMs when they are
subjected to thermal loads for appropriate design. Therefore, using an improved third order shear deformation
theory (TSDT) based on more rigorous kinetics of displacements to predict the behaviors of functionally graded
plates is expected to be more suitable than using other theories. In this paper, the improved TSDT is used to
investigate thermal buckling of functionally graded plates.
Temperature dependent material property solutions are adopted to investigate thermal buckling results of
functionally graded plates. To obtain the solutions, the Ritz method using polynomial and trigonometric
functions for defining admissible displacements and rotations is applied to solve the governing equations.
Power Quality Improvement of Grid Interconnection of renewable Energy Based D...IJERA Editor
This paper presents a grid interfacing inverter which compensates power quality problems and also interface Renewable Energy Sources with the help of electric grid. Renewable Energy Sources are being increasingly connected in distribution system utilizing power electronic converters. Grid interfacing inverter can be used: 1) To improve the transfer of active power harvested from RES; 2) To meet load reactive power demand support ; 3) To reduce current harmonics by incorporating the current harmonic compensator at point of common coupling(PCC) ; 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. The fuzzy logic can be used in many applications especially, when the process/models are complex to analyse by using classical methods. Mainly fuzzy logic controller is used to control DC capacitor voltage. Simulations are carried out using MATLAB/SIMULINK to verify the performance of the controller. The output shows the controller has fast dynamic response high accuracy of tracking DC voltage reference and robust to load parameters variations.
Power Optimization of Battery Charging System Using FPGA Based Neural Network...IJERA Editor
This paper involves designing a small scale battery charging system which is powered via a photovoltaic panel. This work aims at the usage of solar energy for charging the battery and optimizing the power of the system. Implementation is done using Artificial Neural Network (ANN) on FPGA. To develop this system an Artificial Neural Network is trained and its result is further used for the PWM technique. PWM pulse generation has been done using Papilio board which is based on XILINX Spartan 3E FPGA. The ANN with PWM technique is ported on FPGA which is programmed using VHDL. This able to automatically control the whole charging system operation without requirement of external sensory unit. The simulation results are achieved by using MATLAB and XILINX. These results allowed demonstrating the charging of the battery using proposed ANN and PWM technique.
Crystal Growth and Characterization of Cobalt Doped Barium Tartrate Crystals ...IJERA Editor
Single crystals of Cobalt doped Barium tartrate crystals were grown by single diffusion technique at room temperature. Effect of Cobalt doping in the Barium tartarate crystals has been studied and reported. The XRD pattern shows that Cobalt barium tartarate crystals are polycrystalline in nature and having orthorhombic structure. SEM pictures infer that crystals were grown by layer deposition. The elemental analysis has been carried out by EDAX. The chemical analysis has been performed by FTIR to denote the functional group of grown crystal. The thermal stability has been studied by the TGA, DTG and DSC.
Crosscutting Specification Interference Detection at Aspect Oriented UML-Base...IJERA Editor
In aspect oriented development, obliviousness is one of its pillars as it helps developers to implement crosscutting concerns via aspects, which increases the overall software modularity. Despite of its merits, obliviousness brings the problem of interferences among aspects as several aspects pointcuts may address the same joinpoint for the same advice. Existing approaches deals with conflicts at design level use graphs structures, which increase in size as project size increases. In this work, a relational database model is used to map aspect oriented design models and then conflicts are extracted by an algorithm runs over this database. This approach is simpler than other approaches and enables large project sizes while the other approaches get complicated due to increment in graph size. The proposed approach can be extended to the distributed team development, dependent on the database engine used.
Aerodynamic Drag Reduction for A Generic Sport Utility Vehicle Using Rear Suc...IJERA Editor
The high demand for new and improved aerodynamic drag reduction devices has led to the invention of flow control mechanisms and continuous suction is a promising strategy that does not have major impact on vehicle geometry. The implementation of this technique on sport utility vehicles (SUV) requires adequate choice of the size and location of the opening as well as the magnitude of the boundary suction velocity. In this paper we introduce a new methodology to identifying these parameters for maximum reduction in aerodynamic drag. The technique combines automatic modeling of the suction slit, computational fluid dynamics (CFD) and a global search method using orthogonal arrays. It is shown that a properly designed suction mechanism can reduce drag by up to 9%.
Analysis of Total Harmonic Distortion (THD) Level of Distribution Network Usi...IJERA Editor
The modern sensitive, Non-linear and sophisticated load affects the power quality. Dynamic Voltage Restorer (DVR) provides the fast, flexible and efficient solution to improve the power quality for such distribution network [8]. The active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operations are the major source of affecting power quality. The intent of this paper is to demonstrate the improvements obtained with DVR in power system network using MATLAB/SIMULINK. In this paper, an overview of the DVR, its functions, configurations, components, control strategies are reviewed. The Simulation results are presented to illustrate the performance of DVR in Total Harmonic Distortion (THD). The results showed clearly the performance of using DVR in improving THD level.
Scientific principles and concepts expressed through the laws, equations and formulas are the bedrock for the prediction of the deign-in functionality performance of any engineering creation. However, there are not equivalent when the in-service functionability predictions have to be made. Hence, Mirce Mechanics has been created at the MIRCE Akademy to fulfil the roll. The main purpose of this paper is to present the development and application of Mirce Functionability Equation which is the bedrock for the prediction of the in-service motion of functionability performance of maintainable systems.
Analysis and Site Suitability Evaluation for Textile Sewage Water Treatment P...IJERA Editor
Textile processing units in Erode, Karur, Salem and Tirupur districts of Tamilnadu, India generates chemically toxic waste water there by polluting sub-soil and surface water of water bodies in particular River Cauvery. In Erode district, a model Common effluent treatment plant (CETP) was promoted by State Industrial Promotion Corporation of Tamilnadu Ltd., at Perundurai with 14 textile units as stake holders. Waste water from textile processing units contains a complex mixture of dyes, which are highly resistant to conventional treatment technology. As the characteristics of wash water effluent and dye bath effluent are variable, various physical, chemical and biological treatment methods are adopted for the treatment. Most of the perennial rivers in Tamilnadu have less surface flow water and dried during summer season. The area lies in arid zone of Salem, Tamil Nadu having very scanty rains and very low ground water reserves. Some of the other problems that are faced by the area are disposal of industrial effluent posing threat to its sustainability of water resource. Textiles, dyeing and printing industries, various mechanical process and chemical/synthetic dyes are used and considerable wastewater discharged from these textile units contains about high amount of the dyes into the adjoining drainages. Geographic Information System (GIS) can be used as a decision support tool for planning waste management. The manual methods adopted for the analysis of many factors would be a tedious and lengthy work.
Dynamics of Twointeracting Electronsinthree-Dimensional LatticeIOSR Journals
The physical property of strongly correlated electrons on a three-dimensional (3D) 3 x 3 x 3 cluster of the simple cubic lattice is here presented.In the work we developed the unit step Hamiltonian as a solution to the single band Hubbard Hamiltonian for the case of two electrons interaction in a finite three dimensional lattice. The approximation to the Hubbard Hamiltonian study is actually necessary because of the strong limitation and difficulty pose by the Hubbard Hamiltonian as we move away from finite - size lattices to larger N - dimensional lattices. Thus this work has provided a means of overcoming the finite - size lattice defects as we pass on to a higher dimension. We have shown in this study, that the repulsive Coulomb interaction which in part leads to the strong electronic correlations, would indicate that the two electron system prefer not to condense into s-wave superconducting singlet state (s = 0), at high positive values of the interaction strength. This study reveals that when the Coulomb interaction is zero, that is, for free electron system (non-interacting), thevariational parameters which describe the probability distribution of lattice electron system is the same. The spectra intensity for on-site electrons is zero for all values of the interaction strength
Investigation on EM radiations from interconnects in integrated circuitsTELKOMNIKA JOURNAL
Characterization and estimation of interconnections behavior in integrated circuits design before the implementation phase is of paramount importance. This behavior seen as microstrip antennas gets complex as the internal signal (square or sine waves) frequencies increase. Thus, they become the preferred path for the propagation of electromagnetic disturbances. In this work we have worked out the numerical modeling of the electromagnetic interactions characterizing the electromagnetic compatibility in the microstrip transmission lines. The effect of these electromagnetic interactions in different structures topologies are studied through the analysis of the influence of the supply signals frequency and structures. The spacing between transmission line tracks and the number of tracks superposition is modeled. The evolution and variation of the scheme parameters in the frequency domain are determined. The transmission lines are considered parallel of equal spacing and superposed tracks of equal spacing and thickness. The capacitance and inductance matrices are computed and discussed. The results are found to comply with current research outcomes.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
A SIMPLE METHOD TO AMPLIFY MICRO DISPLACEMENTijcisjournal
ABSTRACT
A simple method to amplify the micro displacements produced by magnetostrictive effect, giant magnetostrictive, converse piezoelectric and photo strictive effect, respectively, is reported. The device consists mainly of two material rods with different coefficients of strains vs intensity of external fields, which are rigidly jointed, so that the displacements created by different rods can be added directly. In contrast with all other methods reported so far, which are all based on the principle of lever, this approach holds some unique advantages that can be applied to respond to the electromagnetic fields with high frequency because there is no friction caused by the relative motion between levers and furthermore, an ideal and smooth amplification of micro displacement can be obtained with ease in principle.
Modeling the transport of charge carriers in the active devices diode submicr...IJERA Editor
A Monte Carlo simulation program was developed to simulate the movement of electrons in a submicron GaInP diode three dimensional (3D) with 0.1 microns-long active layer. The algorithm couples a standard Monte Carlo particle simulator for the Boltzmann equation with a 3D Poisson solver. Thus a series of hits for a specific MC submicron diode (GaInP), with an active layer (n = 2x1015cm-3) of length 0.1μm surrounded by two regions doped with n = 5x1017cm-3, are presented. The lattice temperature is 300K and the anode voltage Va is 1V. The analysis also showed that the average drift velocity to the electrons in the channel is about 5x106 cm/sec
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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Numerical simulation of electromagnetic radiation using high-order discontinu...IJECEIAES
In this paper, we propose the simulation of 2-dimensional electromagnetic wave radiation using high-order discontinuous Galerkin time domain method to solve Maxwell's equations. The domains are discretized into unstructured straight-sided triangle elements that allow enhanced flexibility when dealing with complex geometries. The electric and magnetic fields are expanded into a high-order polynomial spectral approximation over each triangle element. The field conservation between the elements is enforced using central difference flux calculation at element interfaces. Perfectly matched layer (PML) boundary condition is used to absorb the waves that leave the domain. The comparison of numerical calculations is performed by the graphical displays and numerical data of radiation phenomenon and presented particularly with the results of the FDTD method. Finally, our simulations show that the proposed method can handle simulation of electromagnetic radiation with complex geometries easily.
FERROMAGNETIC-FERROELECTRIC COMPOSITE 1D NANOSTRUCTURE IN THE PURSUIT OF MAGN...ijrap
Nanocomposites of linear chain of ferroelectric-ferromagnetic crystal structure is considered. It is analyzed
theoretically in the motion equation method on the pursuit of magnonic excitations,lattice vibration
excitations and their interactions leading to a new collective mode of excitations,the electormagnons. In
this particular work, it is observed that the magnetizations and polarizations are tunable in a given temperature ranges for some specific values of the coupling order parameter.
Ferromagnetic-Ferroelectric Composite 1D Nanostructure in the Pursuit of Magn...ijrap
Nanocomposites of linear chain of ferroelectric-ferromagnetic crystal structure is considered. It is analyzed
theoretically in the motion equation method on the pursuit of magnonic excitations,lattice vibration
excitations and their interactions leading to a new collective mode of excitations,the electormagnons. In
this particular work, it is observed that the magnetizations and polarizations are tunable in a given
temperature ranges for some specific values of the coupling order parameter
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Electronic bands structure and gap in mid-infrared detector InAs/GaSb type II...IJERA Editor
We present here theoretical study of the electronic bands structure E (d1) of InAs (d1=25 Å)/GaSb (d2=25 Å) type
II superlattice at 4.2 K performed in the envelope function formalism. We study the effect of d1 and the offset ,
between heavy holes bands edges of InAs and GaSb, on the band gap Eg (), at the center of the first Brillouin
zone, and the semiconductor-to-semimetal transition. Eg (, T) decreases from 288.7 meV at 4.2 K to 230 meV
at 300K. In the investigated temperature range, the cut-off wavelength 4.3 m ≤ c ≤ 5.4 m situates this sample
as mid-wavelength infrared detector (MWIR). Our results are in good agreement with the experimental data
realized by C. Cervera et al.
Electronic bands structure and gap in mid-infrared detector InAs/GaSb type II...
P04602104105
1. Sara Nobakht et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 6( Version 2), June 2014, pp.104-105
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Non-Equilibrium Green's Function Calculation for Electron Transport through Magnetic Tunnel Junction Sara Nobakht, Adeleh Vatan-Khahan and Hadi Arabshahi Physics Department, Khayyam Higher Education Institute, Mashhad, Iran Abstract In this paper non-equilibrium Green's function method –dependent electron transport through non magnetic layer (insulator ) has been studied in one dimension .electron transport in multi-layer (magnetic/non magnetic/ magnetic)layers is studied as quantum .the result show increasing the binding strength of the electrical insulator transition probability density case , the electron density , broad levels of disruption increases. Broad band connection increases the levels of disruption to electrical insulation and show non- conductive insulating state to semiconductor stat and even conductor
I. Introduction
Tunnel magneto resistance (TMR) is a magneto resistive effect that occurs in a magnetic tunnel junction (MTJ), which is a component consisting of two ferromagnets separated by a thin insulator. If the insulating layer is thin enough (typically a few nanometers), electrons can tunnel from one ferromagnet into the other. Since this process is forbidden in classical physics, the tunnel magneto resistance is a strictly quantum mechanical phenomenon .The main feature of this system, Tunneling current depends on the relative orientation of the magnetization of the two ferromagnetic layers.The direction of the two magnetizations of the ferromagnetic films can be switched individually by an external magnetic field. If the magnetizations are in a parallel orientation it is more likely that electrons will tunnel through the insulating film than if they are in the oppositional (anti parallel) orientation. Consequently, such a junction can be switched between two states of electrical resistance, one with low and one with very high resistance. In this paper, electron transport in multi-layer(magnetic/non magnetic/ magnetic)layers is studied as quantum .All the curves in this paper are plotted by using MATLAB programming .This paper is organized as follows . Details of non equilibrium Green's function the model in section 2 and the results of the transition probability density of states ,a board concentration levels and the power connector insulated electrodes were calculated in section 3.
II. MODEL DETAILS
Non equilibrium Green's function (NEGF) technique plays the central role in the development of generalized approaches to the study of transport in nanostructures. This approach systematically takes into account the band structure, electron correlation effects, non equilibrium occupations, layer thickness, applied bias and temperature in the calculation of the current and hence it can provide a reliable description of the transport in these systems. Our present interest is on the transport in magnetic tunnel junctions (MTJs) and we have employed the NEGF techniques to study the magneto transport in MTJs [1]. The solution of single-particle quantum problems, formulated with the help of a matrix Hamiltonian, is possible along the usual line of finding the wave functions on a lattice, solving the Schrödinger equation [2]. The other method, namely matrix Green functions, considered in this section, was found to be more convenient for transport calculations, especially when interactions are included. The retarded single- particle matrix Green function GR(ε) is determined by the equation Where ɳ is an infinitesimally small positive number ɳ = 0+. For an isolated non interacting system the Green function is simply obtained after the matrix inversion [3]. In the next section, we'll study it with an example.
III. Results
In this section, we studied an analytical example of the transport. figure 1 is considered for two connect . This is the Hamiltonian. We show effects caused connect with adjacent layers in the self-energy sentences as face following.
RESEARCH ARTICLE OPEN ACCESS
2. Sara Nobakht et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 6( Version 2), June 2014, pp.104-105
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So Green's function is: And transport's function is :
In problem, a =0.3 (nm), u0=0.4 (ev) and (effective mass) m=0.025 m0 .The figures 2 and 3 show energy in the equilibrium state and energy in terms of transport's function. In figure 3 shows two sharp peaks and difference between the two peaks is due to the potential barrier between the two layers. Fig 2. Changes energy in terms of Location Fig 3. Changes energy in terms of transport's function
We change the three layers properties until transport function to maximize. Figure 4 shows it Fig 4. Changes energy in terms of transport maximum.
IV. Conclusion
It can be said summary
1. Increasing the binding strength of the electrical insulator transition probability density case, the electron density, broad levels of disruption increases.
2. Broad band connection increases the levels of disruption to electrical insulation and show non- conductive insulating state to semiconductor stat and even conductor.
3. We can control the electron transport in the non- conductive.
References
[1]. S. Mathis Jaya and M. C. Valsakumar, Euro. Phys. J. B, 72, 41 (2009) [2]. Esaki. TsuR, (1970), IBMJ.Res.Dev.14, 6. [3]. Omar-M.A.Elewentary Solid state physics, (1975), principles and Application Addisonwesley. [4]. Mohn-p. Magetism in the solid state, an introduction (2006), Springer series in solid- state sciences.134. [5]. Heisenberg,(1926),zeitschf.physik38441