- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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A TUNABLE ELECTROMAGNETIC BANDGAP STRUCTURE USING PLASMA
摘要： A tunable electromagnetic-bangap (EBG) structure based on a double layer slotline using plasma is proposed. The plasma permittivity can be tuned by the electron density. The idea of integrating periodical plasma elements inside the slot to tune the stopband is investigated. An electron density and an electron collision frequency equal to 1.75 1013 cm?3 and 1010 s?1 respectively, are the plasma parameters selected in this study. The simulations reveal a shift rate of the second stopband equal to 6%. A new con?guration of the structure is also proposed to adapt it better to the experimental requirements. Based on the simulation results, adding the plasma elements to the modi?ed con?guration shifts the stopband 4% and reduces its bandwidth by 43% (at ?20 dB).
关键词： electron density,slotline,plasma,tunable electromagnetic bandgap,electron collision frequency,stopband
更新于2025-09-09 09:28:46
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Shape-Dependent Aggregation of Silver Particles by Molecular Dynamics Simulation
摘要： In crystallization, nanoparticle aggregation often leads to the formation of orderly structures, even single crystals. Why can nanoparticles form orderly structures and what is the mechanism dominating their orderly aggregation? These questions raise interesting research problems, but the occurrences that could answer them often fail to be directly observed, since the interaction among particles is invisible. Here, we report an attempt to discover the interaction and aggregation of building blocks through a computer simulation, focusing on the shape effect of building blocks on the aggregation. Four types of silver building blocks were selected, each consisting of (100) and (111) facets, but the ratio of these two facets was different. It was found that the area of facets played an important role in selecting the aggregation mode. The facets with a large area and high energy had a high possibility of aggregation. In addition, the effects of solvent viscosity and temperature were also investigated. High viscosity and low temperature enhanced the orderliness of aggregation. This paper reports a detailed view of the aggregation process of silver nanoparticles, which is expected to be helpful in understanding the structure evolution of materials in nonclassical crystallization.
关键词： silver nanoparticle,surface energy,facet area,collision frequency,aggregation process
更新于2025-09-04 15:30:14