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Title: Accurate Analysis of the Number of Fins in the Triple-Gate FinFET Capacitance Compact Model
Author(s): Omar H. El-Sewefy, Wael Fikry Farouk, Mohamed Dessouky
Pages: 1-5 Paper ID:149106-1502-8383-IJET-IJENS Published: April, 2015
Abstract: In this paper, an enhancement to previous semi-analytical models of the gate extrinsic capacitance of FinFET transistors is introduced. This allows to properly model the capacitance behavior when Multi-Fins are used. The proposed semi-analytical models takes into account the source/drain electrode and contact areas. In this paper, it is shown that this modification reduced the modelling error to only 3%.
Keywords: FinFETs, Extrinsic Capacitance, Fringing Gate Capacitance, Fringing Electric Field.
Full Text (.pdf)  International Journals Of Engineering and Science | 714 KB
Title: Study on Different Types of Dyeing Faults, Causes and Remedies of Knit Fabrics
Author(s): Moyinul Islam, Sakil Mahmud
Pages: 6-15 Paper ID:150102-6969-IJET-IJENS Published: April, 2015
Abstract: Dyeing faults are very common in textile industry. There are various types of faults occurs during knit dyeing. It is important therefore when assessing a fault to try to ascertain the root cause. Careful consideration of the possible cause of the fault will enable suitable corrective action to be taken to ensure that the same faults do not re-occur. For uniform dyeing, the fabric’s absorbency must be uniform. While preparation may not totally remove all the natural and synthetic chemicals present in the grey material, the residues should be minimal and uniformly distributed. This paper tries to find out the major dyeing faults of knit fabric & how we can remove or minimize these dyeing faults. Hope this paper will help those people who are in textile dyeing industry.
Keywords: Knit fabrics, dyeing faults, causes and remedies.
Full Text (.pdf)  International Journals Of Engineering and Science | 862 KB
Title: Optical Parametric Oscillation in Hg1-xCdxGa2S4
Author(s): Rena J. Kasumova, Sh. A. Shamilova, G. A. Safarova, L. S. Gadjieva
Pages: 16-22 Paper ID:151702-8383-IJET-IJENS Published: April, 2015
Abstract: In this work, parametric interaction is investigated with the account for phase change of interacting pump, signal and idler waves in the materials of infrared range of spectrum in case of Hg1-xCdxGa2S4 crystal. We give an analysis of the threshold intensity of pumping for Hg1-xCdxGa2S4 crystal under conditions of the existing experiment. The values of refractive indices, angle of phase matching and angular dispersion coefficient of the second order have been calculated for Hg1-xCdxGa2S4 at 90-degree phase matching.
Keywords: Parametric interaction, mid-IR region, constant-intensity approximation.
Full Text (.pdf)  International Journals Of Engineering and Science | 555 KB
Title: Prediction of Wavefront on Laminated Composites due to Wave-controlled Impact
Author(s): Kook Chan Ahn
Pages: 23-29 Paper ID:154202-8686-IJET-IJENS Published: April, 2015
Abstract: Small mass impacts on composite structures caused by a dropped tool and debris from runways can create internal damage that reduces the strength of the structure significantly. Small mass impacts usually result in a wave-controlled response which is independent of boundary conditions. This response occurs before the reflection of wave from the boundaries and cannot be modeled by large mass impact. The prediction of wavefront on graphite/epoxy laminated composite beams subjected to small mass impact load is studied by the use of the developed finite element program and wave propagation method. The modified Hertzian contact law which accounts for permanent indentation is used to calculate the dynamic responses between the impactor and laminated target. The present finite element simulation and wave propagation method are compared and presented to demonstrate the effect of wavefront due to stacking sequence and thickness of graphite/epoxy laminated composites. The present finite element results show a good agreement with those of wave propagation method and it is recommended for future accurate wavefront predictions. Consequently, it may be concluded that the wavefront on stacking sequence [0/30/0/-30]S and [0/30/0/-30]2S laminate is much larger than that of [90/60/90/-60]S and [90/60/90/-60]2S laminates, respectively, and also, the thicker thickness of laminate is, the larger the wavefront propagates. That is, the bending stiffness by stacking sequence and thickness of laminated composites has significant effect on the wavefront of laminated composites due to wave-controlled impact.
Keywords: Laminated composites, wavefront, small mass impact, permanent indentation, wave-controlled, boundary-controlled.
Full Text (.pdf)  International Journals Of Engineering and Science | 868 KB
Title: Internal Multi - Model Control of Non-linear Discrete-time Systems
Author(s): Chakra Othman, Dhaou Soudani
Pages: 30-36 Paper ID:151002-6363-IJET-IJENS Published: April, 2015
Abstract: In this paper, internal multi-model control method to the case of nonlinear discrete-time systems is proposed. This control approach is based firstly on the method of switching between different partial commands and secondly on residues techniques. We are interested in this article to the affine control nonlinear systems. The nonlinear system can be described by a library of linear models. We use the multi-model approach to determinate the internal models of this control structures. To validate this method, simulation results are presented.
Keywords: Internal multi-model control IMMC, non-linear systems, affine non-linear control systems, switching method, residues techniques.
Full Text (.pdf)  International Journals Of Engineering and Science | 646 KB
Title: Response of Monolithic and Laminated Glass under Impact Loading
Author(s): Dae Sik Jung, Kook Chan Ahn
Pages: 37-41 Paper ID:154302-9696-IJET-IJENS Published: April, 2015
Abstract: The response of monolithic and laminated glasses, without damage, subjected to wave controlled impact, is studied by the use of the coded finite element program. The performance of the monolithic and laminated glass beams subjected to the transverse impact loading is thoroughly examined. To model and simulate impact response of both the monolithic and laminated glasses, a simple finite element approach based on the Sun's higher-order beam finite element and Dharani's PVB interlayer model is proposed. The verification of the numerical model is conducted by using the equivalent mass model and wave propagation theory for the monolithic and laminated glass beams. The present finite element results show a good agreement with two open literature results and it is recommended for future impact predictions. The response results such as the time histories for contact force, deflection, strain and energy during impact event regarding the impact velocity changes are obtained and compared with each other between the monolithic and laminated glass.
Keywords: Monolithic glass (MG), laminated glass (LG), PVB interlayer, impact response, impact energy.
Full Text (.pdf)  International Journals Of Engineering and Science | 570 KB
Title: Thermoelectric Performance of Na1-xCaxCo2O4
Author(s): Erwin Ermawan, Soehardjo Poertadji
Pages: 42-45 Paper ID:153502-4747-IJET-IJENS Published:April, 2015
Abstract: Several samples of single phase material of thermoelectric oxyde Na1-xCaxCo2O4 (with x = 0, 0.1, 0.2 and 0.3) are prepared using solid state reaction process. During experiment, the thermoelectric properties measurement for each sample are taken from ambient condition to temperature 573 K. The calculated figure of merit (ZT) 0.89 is obtained for Na0.7Ca0.3Co2O4 sample at temperature 573 K. The observation indicates that Ca doping process increases the Seebeck coefficient and electrical resistivity of the sample. Therefore, it can be concluded that the Ca atom substitution on Na atom is essential to enhance thermoelectric properties.
Keywords: Na1-xCaxCo2O4, Seebeck coefficient, scattering effect.
Full Text (.pdf)  International Journals Of Engineering and Science | 393 KB
Title: Black cumin (Nigella sativa) as Low Cost Biosorbent For the Removal of Toxic Cu (II) and Pb (II) From Aqueous Solutions
Author(s): Hanaa H. Abdel Rahman, Amira H. E. Moustafa, Mohamed G. Kassem
Pages: 46-66 Paper ID:158402-7676-IJET-IJENS Published:April, 2015
Abstract: Black cumin, an annual plant was used as effective biosorbent for the removal of toxic Cu (II) and Pb (II) from aqueous solution. Continuous techniques due to large size of black cumin were carried out under different pH, contact time, initial metal ion concentration, dosage and temperature. The biosorption capacity was found to be increased in the order of Pb (II) >Cu (II). Kinetic studies demonstrate that, the data fit a pseudo second- order mechanism. Different isotherm models were applied to describe the biosorption in all analyzed cases. SEM, FT-IR and EDX analysis were employed for the evaluation of biosorption process.
Keywords: Biosorption, Black cumin, Copper ions, Lead ions, Biosorption capacity, Kinetics, Isotherm models, SEM, FT-IR, EDX.
Full Text (.pdf)  International Journals Of Engineering and Science | 1,159 KB
Title: On The Use of the Scaled Boundary Finite Element Method for Dynamic Analysis of Plates
Author(s): Nivaldo Benedito Ferreira Campos, José Maria Campos dos Santos
Pages: 67-71 Paper ID:1510802-7575-IJET-IJENS Published:April, 2015
Abstract: Predicting the dynamic behavior of complex structures is possible by the use of high accurate numerical models. Generally, structural systems are modeled using methods such as finite element method (FEM), finite difference method (FDM) or boundary element method (BEM). The scaled boundary finite element method (SBFEM) is a semi-analytical boundary method that does not requires the knowledge of a fundamental-solution to make possible its formulation and it is based on FEM. Using in-plane and out of plane motion structural dynamic problems and discretizing the boundary with three nodes quadratic line finite element, in this work the derivation of the frequency response function (FRF) by SBFEM is presented. From the FRFs, the natural frequencies and mode shapes can be obtained by performing a theoretical modal analysis. Numerical studies considering various assumptions for the scaled boundary finite element method are presented and the results obtained are compared with FEM.
Keywords: Scaled boundary finite element method, plate, vibration, frequency response function.
Full Text (.pdf)  International Journals Of Engineering and Science | 361 KB
Title: Boundary Element Model Updating Using Frequency Response Functions
Author(s): Nivaldo Benedito Ferreira Campos, José Maria Campos dos Santos
Pages: 72-78 Paper ID:1511302-6969-IJET-IJENS Published:April, 2015
Abstract: In order to model the dynamic behavior of complex structures it is required numerical models with high accuracy. These models generally are obtained by using numerical methods such as finite element method, finite difference method, and boundary element method, the latter having become an interesting option compared to the other two. Nevertheless, rarely the dynamic behavior of a real structure will match that obtained with its numerical model. To overcome this problem, an alternative it to use model updating techniques. In this work, it is presented a technique of model updating based in correlating an experimental frequency response function (FRF) with one from a boundary element method model. The correlation is evaluated through an objective function consisting in the sum of the squared differences between the FRFs. Several cases were considered to present the boundary element method model updating technique. The results obtained usind boundary element model were compared with those from the updating of finite element models.
Keywords: Model updating, boundary element method, beams, frequency response function.
Full Text (.pdf)  International Journals Of Engineering and Science | 617 KB