The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
K W Eccleston - One of the best experts on this subject based on the ideXlab platform.
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mode analysis of the corrugated substrate integrated waveguide
IEEE Transactions on Microwave Theory and Techniques, 2012Co-Authors: K W EcclestonAbstract:The corrugated substrate integrated waveguide (CSIW) is compatible with substrate integrated waveguides (SIWs) but permits ease of integration of active devices. The CSIW differs from the SIW by using quarter-wave open-circuit stubs in place of vias to form the electric sidewalls. In this paper, an efficient analysis method has been formulated that distributes the Loading Effect of each stub across its width. The formulation was used to calculate CSIW dispersion characteristics and identify mode behavior in the vicinity of the desired TE10 mode. Simulations and measurements of X-band CSIWs were used to validate the calculations. Apart from normal waveguide mode behavior, surface wave-like behavior was also identified.
Jikui Luo - One of the best experts on this subject based on the ideXlab platform.
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fast response and high sensitivity zno glass surface acoustic wave humidity sensors using graphene oxide sensing layer
Scientific Reports, 2015Co-Authors: Weipeng Xuan, Nan Meng, Wenbo Wang, Jinkai Chen, Tianjin Shi, Tawfique Hasan, Jikui LuoAbstract:We report ZnO/glass surface acoustic wave (SAW) humidity sensors with high sensitivity and fast response using graphene oxide sensing layer. The frequency shift of the sensors is exponentially correlated to the humidity change, induced mainly by mass Loading Effect rather than the complex impedance change of the sensing layer. The SAW sensors show high sensitivity at a broad humidity range from 0.5%RH to 85%RH with < 1 sec rise time. The simple design and excellent stability of our GO-based SAW humidity sensors, complemented with full humidity range measurement, highlights their potential in a wide range of applications.
F G Mitri - One of the best experts on this subject based on the ideXlab platform.
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acoustic radiation force on cylindrical shells in a plane standing wave
Journal of Physics A, 2005Co-Authors: F G MitriAbstract:In this paper, the radiation force per length resulting from a plane standing wave incident on an infinitely long cylindrical shell is computed. The cases of elastic and viscoelastic shells immersed in ideal (non-viscous) fluids are considered with particular emphasis on their thickness and the content of their interior hollow spaces. Numerical calculations of the radiation force function Yst are performed. The fluid-Loading Effect on the radiation force function curves is analysed as well. The results show several features quite different when the interior hollow space is changed from air to water. Moreover, the theory developed here is more general since it includes the results on cylinders.
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acoustic radiation force acting on elastic and viscoelastic spherical shells placed in a plane standing wave field
Ultrasonics, 2005Co-Authors: F G MitriAbstract:Abstract The theory of the acoustic radiation force acting on elastic spherical shells suspended in a plane standing wave field is developed in relation to their thickness and the content of their hollow regions. The theory is modified to include the Effect of a hysteresis type of absorption of compressional and shear waves in the material. The fluid-Loading Effect on the acoustic radiation force function Yst is analyzed as well. Results of numerical calculations are presented for a number of elastic and viscoelastic materials, with the hollow region filled with water or air. These results show how the damping due to absorption, the change of the interior fluid inside the shells’ hollow regions, and the exterior fluid surrounding their structures, affect the acoustic radiation force.
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theoretical calculation of the acoustic radiation force acting on elastic and viscoelastic cylinders placed in a plane standing or quasistanding wave field
European Physical Journal B, 2005Co-Authors: F G MitriAbstract:In this work, a new expression of the acoustic radiation force function Yst for solid cylindrical targets, suspended in inviscid fluids in a plane standing wave field, is presented. The case of a plane quasistanding wave field is also considered. Numerical calculations of the radiation force function Yst are performed in a wide range of frequencies for elastic and viscoelastic cylinders and compared to those of rigid cylinders. The fluid-Loading Effect on the radiation force function curves is also analysed. The results show several features quite different from the rigid cylinder solution. Copyright EDP Sciences/Societa Italiana di Fisica/Springer-Verlag 2005
Amir M Kaynia - One of the best experts on this subject based on the ideXlab platform.
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suction caisson foundations for offshore wind turbines subjected to wave and earthquake Loading Effect of soil foundation interface
Geotechnique, 2014Co-Authors: Rallis Kourkoulis, P C Lekkakis, F Gelagoti, Amir M KayniaAbstract:The response of wind turbines founded on suction caissons and subjected to lateral monotonic, cyclic and earthquake Loading is studied with due consideration of the role of soil–sidewall adhesion, ...
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suction caisson foundations for offshore wind turbines subjected to wave and earthquake Loading Effect of soil foundation interface
Geotechnique, 2014Co-Authors: Rallis Kourkoulis, P C Lekkakis, F Gelagoti, Amir M KayniaAbstract:The response of wind turbines founded on suction caissons and subjected to lateral monotonic, cyclic and earthquake Loading is studied with due consideration of the role of soil–sidewall adhesion, using non-linear three-dimensional finite-element analyses. In the case of monotonic and slow cyclic lateral Loading it is shown that imperfect interface bonding could reduce the moment capacity and may lead to foundation detachment or even uplifting in the case of shallowly embedded caissons. A preliminary comparison of two caisson alternatives has shown that increasing the caisson diameter while maintaining the embedment ratio is more efficient in terms of material resources than increasing the skirt length while keeping the diameter constant. The second part of the study evaluates the response of a soil–foundation–wind turbine interacting system subjected to earthquake shaking. Contrary to an often prevailing impression that seismic Effects are insignificant, apparently originating from evaluating the seismic...
Chandan Kumar Chanda - One of the best experts on this subject based on the ideXlab platform.
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teaching learning based optimization for economic load dispatch problem considering valve point Loading Effect
International Journal of Electrical Power & Energy Systems, 2015Co-Authors: Sumit Banerjee, Deblina Maity, Chandan Kumar ChandaAbstract:Abstract This paper presents a novel teaching learning based optimization (TLBO) technique to solve economic load dispatch (ELD) of the thermal unit without considering transmission losses. The proposed methodology can take care of ELD considering nonlinearity such as valve point Loading. The objective of economic load dispatch is to determine the optimal power generation of the units to meet the load demand, such that the overall cost of generation is minimized, while satisfying different operational constraints. TLBO is a recently developed evolutionary algorithm based on two basic concepts of education namely teaching phase and learning phase. At first, learners improve their knowledge through the teaching methodology of teacher and finally learners increase their knowledge by interactions among themselves. The Effectiveness of the proposed algorithm has been verified on three different test systems with equality and inequality constraints. Compared with the other existing techniques demonstrates the superiority of the proposed algorithm.