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通过优化设计矩形波导谐振腔微波化学反应器,可以大幅提高微波等离子体下甲烷转化率(最高为93.7%)、C2烃收率(最高为91.0%)和乙炔收率(最高为88.6%).且优化后,在实验的压强范围内,甲烷转化率和C2烃收率较为稳定,C2烃主要是乙炔,其选择性都在90%以上.生成乙炔的能量产率和时空产率也都比较高.利用发射光谱法对微波等离子体下甲烷偶联制乙炔的反应进行了诊断研究,在300nm~750nm波长范围内激发态物种有:CH,C2,H2,Hα-根据反应产物和激发态物种从化学反应热力学和动力学上对反应机理进行了初步探索. 相似文献
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The research of high-directive anisotropic magnetic metamaterial antenna loaded with frequency-selective surface 下载免费PDF全文
This paper uses a Computer Simulation Technology microwave studio to
simulate the performance of a new high-directivity anisotropic
magnetic metamaterial antenna loaded with a frequency-selective
surface. Frequency-selective surface with cross-dipole element has a
great effect on the directivity, radiation pattern, and gain of such
an antenna. The experimental results show that frequency-selective
surface (FSS) significantly improve the radiation performance of
anisotropic magnetic metamaterial antenna. For example, as a single
anisotropic magnetic metamaterial antenna, half power beam width is
4 degrees in the H planes, and the gain of this antenna is 19.5 dBi at
10 GHz, achieving a 2.1 degree increment in half power beam width,
and a 7.3 dB gain increment by loading with the FSS reflector. The
simulating results are consistent with our experimental results. 相似文献
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Active metamaterials incorporating with non-Foster elements have been considered as one of the means of overcoming inherent limitations of the passive counterparts, thus achieving broadband or gain metamaterials. However, realistic active metamaterials, especially non-Foster loaded medium, would face the challenge of the possibility of instability. Moreover,they normally appear to be time-variant and in unsteady states, which leads to the necessity of a stability method to cope with the stability issue considering the system model uncertainty. In this paper, we propose an immittance-based stability method to design a non-Foster loaded metamaterial ensuring robust stability. First, the principle of this stability method is introduced after comparing different stability criteria. Based on the equivalent system model, the stability characterization is used to give the design specifications to achieve an active metamaterial with robust stability. Finally, it is applied to the practical design of active metamaterial with non-Foster loaded loop arrays. By introducing the disturbance into the nonFoster circuit(NFC), the worst-case model uncertainty is considered during the design, and the reliability of our proposed method is verified. This method can also be applied to other realistic design of active metamaterials. 相似文献
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