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[IEEE 2018 Conference on Emerging Devices and Smart Systems (ICEDSS) - Tiruchengode, India (2018.3.2-2018.3.3)] 2018 Conference on Emerging Devices and Smart Systems (ICEDSS) - Finite Element Method Based Performance Analysis of Piezoelectric Materials for Nanogenerator Applications
摘要： Demonstrated through this work is the analysis of piezoelectric behavior of wide band gap materials like ZnO, CdS, BaTiO3, LiNbO3, AlN and PZT for potential application in nano generators. Nano rods of finite dimensions in the form of perfect cylinders were modeled with conventional PZT used in energy harvesting applications and the alternatives like ZnO, BaTiO3, ZnO, AlN, LiNbO3 and CdS whose performance potential and advantages are explained through this work on the basis of analytical and simulation based approaches. Piezoelectric potentials of cylindrical nano rods with two different lengths i.e. 500nm and 600nm and varying diameters were analyzed and the results showed perfect alignment in both numerical and simulation with a minor variation of 7 percent. The potential application of these nano wire systems are in voltage controlled devices like BJT’s and FET’s, energy harvesting systems and biomedical sensing applications. Comsol Multiphysics has been used to calculate the bending of nano rods by applying Finite Element Method (FEM). The results obtained shows that the generated electric potential in the nano wire is independent of the length of the rod along z-axis and the surface piezoelectric potential generated is directly proportional to the displacement of the nanowire in the direction of force and inversely proportional to the cube of its length-to-diameter ratio. The piezoelectric potential generated due to the application of 100nN force on one end of the rod with the other end fixed is ~±2.3V which is suitable to drive gate voltages of various transistors and to be used in sensing applications.
关键词： nano wire,Finite Element Method,Piezoelectric,nanogenerator
更新于2025-09-09 09:28:46
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Homogeneous Electron Transfer Reactions of Electrochemically Generated Species in Electrogenerated Chemiluminescence; 電気化学発光における電極反応の後続反応;
摘要： Electrogenerated Chemiluminescence (ECL) involves electrode reactions and the following homogeneous electron transfer reactions which resulted in a light emission. In this integrated research paper, we focused on the homogeneous electron transfer reactions to form excited states of some luminescent molecules. The Marcus theory was used to estimate ratios of the electron-transfer rate constants between a radical cation and anion to generate the lowest excited singlet and triplet states. In addition, the ECL behavior using tripropylamine as a coreactant was demonstrated by simulating the electrochemical and homogeneous electron transfer reactions with a finite element method. Although coreactants are useful to form excited species, because of complicated reactions in bulk, analyzing the ECL response such as relationship between the current-voltage and ECL intensity curves depending on the redox potentials of luminescent molecules and coreactants is quite difficult. It was shown that the simulations were very useful to understand the ECL response depending on the redox potentials of the coreactant and luminescent molecules.
关键词： Marcus theory,homogeneous electron transfer,Electrogenerated Chemiluminescence,tripropylamine,finite element method
更新于2025-09-09 09:28:46
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MIXED FINITE ELEMENT METHOD FOR 2D VECTOR MAXWELL'S EIGENVALUE PROBLEM IN ANISOTROPIC MEDIA
摘要： It is well known that the conventional edge element method in solving vector Maxwell’s eigenvalue problem will lead to the presence of nonphysical zero eigenvalues. This paper uses the mixed ?nite element method to suppress the presence of these nonphysical zero eigenvalues for 2D vector Maxwell’s eigenvalue problem in anisotropic media. We introduce a Lagrangian multiplier to deal with the constraint of divergence-free condition. Our method is based on employing the ?rst-order edge element basis functions to expand the electric ?eld and linear nodal element basis functions to expand the Lagrangian multiplier. Our numerical experiments show that this method can successfully remove all nonphysical zero and nonzero eigenvalues. We verify that when the cavity has a connected perfect electric boundary, then there is no physical zero eigenvalue. Otherwise, the number of physical zero eigenvalues is one less than the number of disconnected perfect electric boundaries.
关键词： mixed finite element method,Lagrangian multiplier,2D vector Maxwell’s eigenvalue problem,nonphysical zero eigenvalues,anisotropic media
更新于2025-09-09 09:28:46
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Comparative evaluation of novel thermo-chemical treatment methods for improved impact performance of laminated glass
摘要： The thermal and chemical treatment used for glass is not applicable for the laminated glass due to the presence of interlayer having lower melting temperature than the minimum required temperature for the conventional treatment of glass. The present work reports four specialized treatment methods for laminated glass treatment. The effectiveness of the four novel laminated glass treatment methods is evaluated for an impact response of laminated glass. The destructive ball drop testing was performed following EN 356 on laminated glass samples after treating them with each of the four treatment methods. The treatment methods are compared based on the fracture pattern (correlated to the post-fracture response), fragment size, and amount of damage due to the impact by 2.3 kg, 83 mm diameter smooth solid steel ball from the height of 5 m. A multi-purpose algorithm (transient analysis in ANSYS 14.5 (explicit dynamics module)) was utilized for the determination of the maximum deformation and maximum equivalent stress. The regression analysis is conducted for the validation of experimental results. The impact behavior of thermo-chemically treated laminated glass samples was found to be significantly better than the untreated laminated glass samples in the most cases as the impurities/defects were reduced and strength of the laminated glass samples was increased by the treatment. These treatment methods can be customized later for the laminated glass structures and windshields during operating conditions, which would be a significant contribution to this field.
关键词： polyvinyl butyral,finite element method,laminated glass,Impact strength,thermo-chemical treatment
更新于2025-09-09 09:28:46
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Investigation of the nonlinear static and dynamic behaviour of rectangular microplates under electrostatic actuation
摘要： We present an investigation of the static and dynamic behavior of the nonlinear von-Karman plates when actuated by the nonlinear electrostatic forces. The investigation is based on a reduced order model developed using the Galerkin method, which rely on modeshapes and in-plane shape functions extracted using a finite element method. In this study, a fully clamped microplate is considered. We investigate the static behavior and the results are validated by comparison with the results calculated by a finite element model. The forced-vibration response of the plate is then investigated when the plate is excited by a harmonic AC load superimposed to a DC load. The dynamic behavior is examined near the primary resonance. The microplate shows a strong hardening behavior due to the cubic nonlinearity of mid-plane stretching. However, the behavior switches to softening as the DC load is increased.
关键词： Galerkin method,nonlinear von-Karman plates,reduced order model,dynamic behavior,finite element method,softening behavior,static behavior,hardening behavior,electrostatic forces,microplate
更新于2025-09-04 15:30:14
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Accurate and efficient analysis of the upward heat flow in InGaP/GaAs HBTs through an automated FEM-based tool and Design of Experiments
摘要： This paper presents an extensive analysis aimed at quantifying the impact of all the key technology parameters on the upward heat flow in state‐of‐the‐art InGaP/GaAs heterojunction bipolar transistors (HBTs) for various emitter areas and shapes. Extremely accurate thermal simulations are conducted in a relatively short time with a tool relying on a commercial 3‐D finite‐element method (FEM) solver and an in‐house routine for automated geometry construction, optimized mesh generation, sequential solution, and data storing/processing. Design of Experiments is used to define a thermal resistance model as a function of the aforementioned parameters on the basis of a few FEM data.
关键词： finite‐element method (FEM),gallium arsenide (GaAs),Design of Experiments (DOE),thermal simulation,thermal resistance,heterojunction bipolar transistor (HBT)
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore, India (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Differential Pressure Sensor Using Silicon on Insulator Back to Back Cantilever Structure
摘要： In our day to day life differential pressure sensor can be used in much application. This type of pressure sensors are used for measuring the difference between two different pressure levels. Mostly bulk micro machined fabrication tool is used for fabrication process. Hence these type sensors have low cost and reliable than normal conventional sensor. This sensor is designed mainly to compare both the pressure below and above the liquid and flow rates and measures changes in pressure across restriction. The output differential pressure sensor varies with respect to the change in pressure level at up (or) down cantilever beam. When the pressure value at bottom side is high, when the membrane deflect towards forward direction (i.e.) moves upward. when the pressure value at which the bottom side is lower than the membrane deflects to backward direction (moves downward). This design is mainly used in domestic and industrial application.
关键词： Agriculture Applications,MEMS,Humidity Sensor,Temperature Sensor,Finite Element Method (FEM),micro-Cantilever
更新于2025-09-04 15:30:14
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Theoretical study on surface plasmon properties of gold nanostars
摘要： With the rapid development of nanotechnology, the surface plasmon properties of metal nanostructures have become the focus of research. In this paper, a multi-tip gold nanostars (GNSs) structure is designed theoretically, and its surface plasmon properties are simulated by using the finite element method (FEM), which is practical and versatile. Compared with the traditional spherical and triangular plate particles, the results show that the tip structure of the GNSs has a stronger hot spots effect, resulting in greater local field enhancement properties. The relationship between the structure parameters of GNSs and their resonance peaks was also studied. The results indicate that the resonance peaks of GNSs depend strongly on the size, spacing between two GNSs, quantity and refractive index of the GNSs.
关键词： surface plasmon,finite element method,resonance peaks,gold nanostars,local field enhancement
更新于2025-09-04 15:30:14