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An Archimedean Spiral antenna is the common frequency independent antenna which have very large bandwidth. Archimedean Spiral antenna are circularly polarized and typically have radiation patterns with peaks perpendicular to the plane of the spiral. Micro-machining techniques improves ... Mehr lesen
Efforts involving simulation of transmission line networks necessitate the accurate values of the parameters of the lines. In this paper, as an attempt in estimating such parameters, the parameters of high voltage asymmetric power lines are calculated. In the process of estimation, the ... Mehr lesen
In this study we model the sound attenuation properties of a hearing aid earmold tube. The model includes thermoviscous acoustic effects and it couples structural vibrations to the external acoustic field. Moreover, the finite element domain is coupled at two boundaries with an ... Mehr lesen
目前大部分研究集中于空气声学领域，水下声学超材料的报道相对较少。由于水的声学阻抗远大于空气，所以水下声学超材料的设计思路与空气中的相比有很大的不同。针对水下声学超材料，人们提出了一种声学软超材料的概念，即把密度或体积模量远小于水的材料填充在水介质中来构建超材料。然而如何有效且有实际应用价值地制备声学软超材料，仍然是一个难题。本工作通过结合3D打印和材料表面疏水性质，提出了一种制备以气泡为共振单元的超材料的通用方法。利用3D打印的方法制备表面疏水的镂空框架结构，将其浸没入水中后镂空框架中就会形成气泡。这种方法能实现水下三维气泡阵列的快速制备，气泡的形状、大小 ... Mehr lesen
In this paper, we examine changes of the electric field distributions in waveguide-based axial-type microwave plasma source (MPS) during tuning procedure. The distributions strongly depend on position of the movable short, so does the wave reflection coefficient of the incident wave. A ... Mehr lesen
Electric vehicles (EVs) powered by rechargeable lithium-ion batteries (LIBs) have been developed as a replacement for the conventional internal-combustion-engine automobiles. Research has been yielding a stream of improvements to the traditional LIB technology, focusing on energy and ... Mehr lesen
This paper presents an analysis approach of multicondcutor quasi-TEM lines transmission interconnect in a single dielectric region and multimode waveguides using the finite element method (FEM). FEM is especially suitable and effective for the computation of electromagnetic fields in ... Mehr lesen
Introduction of silicone hydrogel contact lens materials provided products of unprecedented capability to deliver oxygen to the eye during wear. One additional material characteristic of interest is the material’s permeability to ions. This paper discusses descriptive tools and ... Mehr lesen
A compression driver is a certain type of electrodynamic loudspeaker which has a phase plug with slits in front of the diaphragm. The slits are narrow enough that the so-called viscothermal effects are of significant importance. In this paper a 2D axisymmetric finite element model of a ... Mehr lesen
Slot coating is a widely used commercial process for applying one or more thin layers to a substrate such as paper, fabric, film or other material. In many cases, a highly uniform thickness is required, where a coating head that has been corrected for use with a Newtonian fluid may not ... Mehr lesen