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A dual-frequency linear-to-circular polarization converter with half transmission and half reflection is designed using a single-layered metamaterial composed of coupled split ring resonators(SRRs) in this paper. The unit cell of this metamaterial structure include two pairs of coupled SRRs of different sizes, and is periodically arranged in plane. The simulated results show that the metamaterial...
Under particle-based framework, level set is generally defined for fluid surfaces and is integrated with marching cubes algorithm to extract fluid surfaces. In these methods, anisotropic kernels method has proven successful for reconstructing fluid surfaces with high quality. It can perfectly represent smooth surfaces, thin stream and sharp features of fluids compare to other methods. In this paper,...
We propose an efficient rigid-fluid coupling method using individual time-stepping for particle-based fluid simulation. It updates neighbors and forces only for active particles. It allocates computing resources to complex regions and has an apparent speedup. We realize our method with several scenarios for rigid-fluid interaction. The experimental results demonstrate that our method is capable to...
We propose a new cloth-fluid coupling scheme which takes the advantages of the position-based method. With the constraint to distance and angle, deformable sheet could be implemented and coupled with fluid particles. Furthermore, an adaptive time-stepping method is adopted for the cloth-fluid coupling, which increases and decreases the required time step automatically according to the scenario. While...
A novel non-Newtonian fluid simulation method for SPH is proposed in this article. The viscous liquid is modeled by a non-Newtonian fluid flow, and the variable viscosity under shear stress is achieved using a viscosity model known as Cross model. To avoid tensile instability and improve numerical stability, a predictive-corrective method, aimed at correcting density error, of setting up individual...
The conventional optical cable labels in smart substations contain too little information to support operation or maintenance. To solve this problem, this paper introduced a QR (Quick Response) code system for labeling and identification of optical cable labels in China's smart substations. The label format is specified for three kinds of cables, and the implementation methods of generation module...
A multi-mode photovoltaic (PV) power generation system based on DC bus is proposed to reduce the impact of mismatching PV strings. By the control of mode switches, the system can change flexibly among three PV systems: central PV system, string PV system and hybrid PV system. Through this method, the system can generate more power and the efficiency will be improved. In addition, in central PV system,...
Nanophotonic integrated devices based on nano-scale silicon hybrid plasmonic waveguides have been demonstrated experimentally, including directional couplers and disk-resonators. The temperature-dependence of the hybrid plasmonic disk-resonators is also characterized.
Silicon-on-insulator (SOI) optical waveguides are fabricated via selective oxidation process without any silicon etching step so that the waveguide surface becomes very smooth to achieve low-loss light propagation potentially. A high-Q ring-resonator is also demonstrated.
In order to reduce the co-frequency interference for multi-cell OFDMA system, a multi-cell dynamic subcarrier allocation scheme was proposed for downlink orthogonal frequency division multiple access (OFDMA) cellular system. The proposed scheme reduces the powers of co-frequency users, which matches access control to maximize the distances between co-frequency subcarriers users. As a result, the proposed...
In this paper, we describe a process for fabricating high-voltage n-channel double-diffused metal-oxide-semiconductor insulated gate bipolar transistors (IGBTs) on free-standing 4H silicon carbide (SiC) epilayers. In this process, all critical layers are epitaxially grown in a continuous sequence. The substrate is then removed, and device fabrication takes place on the carbon face of a free-standing...
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