The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jinbo Liu - One of the best experts on this subject based on the ideXlab platform.
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the use of Continuity Condition on the composite dielectric closed conductor objects
International Conference on Microwave and Millimeter Wave Technology, 2019Co-Authors: Jinbo LiuAbstract:For composite dielectric-conductor structures that contain closed conductive surfaces, a combined field integral equation-volume integral equation with enforced CC (CC-CFIE-VIE) has been proposed. However, since the standard magnetic-field integral equation (MFIE) is involved, the solution might be not as accurate as that only electric field integral equation (EFIE) is involved. The reason for this phenomenon is discussed, and two reported schemes for MFIE revision is applied. Numerical results demonstrate the good precision of the revised CC-CFIE-VIE.
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the application of Continuity Condition in volume surface integral equation combined with the multilevel fast multipole algorithm
Global Symposium on Millimeter-Waves, 2017Co-Authors: Jinbo Liu, Hui ZhangAbstract:The application of the Continuity Condition of the electric flux field at the conductor-dielectric boundaries is discussed. For the conductor-dielectric composite structures involving closed conducting surfaces, a new form of volume-surface integral equation, combined field integral equation-volume integral equation enforced the Continuity Condition is proposed. The matrix equation generated by the proposed method can be iteratively solved in a straightforward manner and can benefit from the application of the multilevel fast multipole algorithm. Numerical results show that the explicit enforcement of the Continuity Condition can reduce not only the peak memory requirement and the CPU time of a single iteration in the solution, but also the total iterative steps to reach convergence.
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on the use of Continuity Condition in the fast solution of volume surface integral equation
IEEE Antennas and Wireless Propagation Letters, 2017Co-Authors: Jinbo Liu, Binbin Wang, Chuanfang Zhang, Houjun SunAbstract:The validity of the use of Continuity Condition (CC) is studied when it is combined with the volume-surface integral equation (VSIE) to solve the electromagnetic scattering/radiation of composite conductor-dielectric objects. It is found that the explicit enforcement of CC in VSIE may be inaccurate if the involved conductor is infinitesimally thin, but it works well for the composite structures that only contain conductors with closed surfaces. A new combined field integral equation-volume integral equation with enforced CC (CC-CFIE-VIE) is then proposed, and a convenient way to embed it into the context of the multilevel fast multipole algorithm is also provided. Numerical results show that CC-CFIE-VIE not only reduces the overall memory usage and the CPU time of a single iteration, but also decreases the number of iterations to reach desired accuracy.
J N Sahalos - One of the best experts on this subject based on the ideXlab platform.
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the disContinuity problem of a rectangular dielectric post in a rectangular waveguide
IEEE Transactions on Microwave Theory and Techniques, 1991Co-Authors: Katherine Siakavara, J N SahalosAbstract:A simple numerical technique for the solution of the disContinuity problem of a symmetric loaded rectangular dielectric post centered in a rectangular waveguide is presented. The waveguide is divided into three regions where the field is expressed in suitable waveguide modes. By applying the Continuity Condition at the common surfaces of the regions, a system of linear equations determining the reflection and transmission coefficients is formed. Several examples are compared with experimental results and show the validity of the method. >
Luu Nguyen - One of the best experts on this subject based on the ideXlab platform.
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effect of current crowding on void propagation at the interface between intermetallic compound and solder in flip chip solder joints
Applied Physics Letters, 2006Co-Authors: Lingyun Zhang, Joanne Huang, Stephen Gee, Luu NguyenAbstract:We propose a kinetic model to describe a pancake-type void propagation in flip chip solder joints due to current crowding in electromigration. The divergence of the vacancy fluxes at the interface between the solder and Cu6Sn5 leads to void formation and propagation along the interface between them. Based on the Continuity Condition, the void growth velocity is calculated. The theoretical calculations are in reasonable agreement with the experimental results.
J X Xu - One of the best experts on this subject based on the ideXlab platform.
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On P-type iterative learning control for nonlinear systems without global Lipschitz Continuity Condition
2015 American Control Conference (ACC), 2015Co-Authors: S. P. Yang, J X XuAbstract:One of fundamental postulates in iterative learning control (ILC) is that the dynamic system needs to be globally Lipschitz continuous (GLC). While numerous successful practical implementations of ILC for various applications have been reported in the literature, many engineered systems do not satisfy this Condition. This indicates that the GLC Condition may not be a necessary Condition when designing an ILC algorithm for an engineered system. This work demonstrates this idea by using a simple P-type ILC updating law. It is shown that the P-type ILC is applicable to very general class of nonlinear dynamic systems with new proof techniques. Therefore, the new developments greatly complement and extend the existing results in the ILC literature. Simulation results demonstrate the effectiveness of the proposed method.
Zhu Dawei - One of the best experts on this subject based on the ideXlab platform.
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free flexural vibration analysis of symmetric rectangular honeycomb panels using the improved reddy s third order plate theory
Composite Structures, 2009Co-Authors: Li Yongqiang, Zhu DaweiAbstract:Abstract The free flexural vibration of symmetric rectangular honeycomb panels is investigated in this paper using the improved Reddy’s third-order theory. Reddy’s third-order theory provides a parabolic distribution of the transverse shear stresses in the thickness direction and represents a close approximation to the true shear strain distribution for a shallow single-layer plate. However, for the case of multilayered laminates, the Continuity Condition on the inter-laminar shear stresses implies a piecewise continuous shear strain distribution in the thickness direction. To accommodate the effect of the Continuity Condition of inter-laminar transverse shear stresses, the shear correction factors are introduced to modify the shear strains in the Reddy’s third-order theory. The shear correction factors are calculated using an iterative formulation based on the shear strain energy equivalence. The improved Reddy’s third-order theory coupled with shear correction factors in predicting free flexural vibration of symmetric honeycomb panels is examined by being compared with the experimental value and the finite element analyses based on three-dimensional models.