An efficient method for the determination of resonant frequencies of shielded circular disk and ring resonators

1993 ◽  
Vol 41 (2) ◽  
pp. 343-346 ◽  
Author(s):  
F. Tefiku ◽  
E. Yamashita
Keyword(s):  
Efficient Method ◽  
Circular Disk ◽  
Ring Resonators ◽  
Resonant Frequencies

Determination of Polycyclic Aromatic Hydrocarbons in Eggs Exposed to Fire Using a Simple and Efficient Method

2021 ◽  
Author(s):  
Vitor Vaz de Melo Antipoff ◽  
Rosimeire Resende dos Santos ◽  
Daniella Vasconcellos Augusti ◽  
Zenilda de Lourdes Cardeal ◽  
Helvécio Costa Menezes
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Efficient Method ◽  
Polycyclic Aromatic

scholarly journals Multi frequency multi bit amplitude modulation of spoof surface plasmon polaritons by schottky diode bridged interdigital SRRs

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Haotian Ling ◽  
Baoqing Zhang ◽  
Mingming Feng ◽  
Pengfei Qian ◽  
Yiming Wang ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Amplitude Modulation ◽  
Schottky Diodes ◽  
Ring Resonators ◽  
Dual Frequency ◽  
Metal Line ◽  
Resonant Frequencies ◽  
Plasmon Polaritons ◽  
Spoof Surface Plasmon Polaritons

AbstractMulti-frequency multi-bit programmable amplitude modulation (AM) of spoof surface plasmon polaritons (SPPs) is realized at millimeter wave frequencies with interdigital split-ring resonators (SRRs) and In-Ga-Zn-O (IGZO) Schottky diodes. Periodic SRRs on a metal line guide both SRR mode and spoof SPP mode, the former of which rejects the spoof SPP propagation at the SRR resonant frequencies. To actively modulate the amplitude of spoof SPPs, IGZO Schottky diodes are fabricated in the SRR gaps, which continuously re-configure SRRs to metallic loops by applying bias. Interdigital gaps are designed in SRRs to increase the capacitance, thus red shifting the resonant frequencies, which significantly broadens the operation bandwidth of multi-frequency AM. Thus, cascading different kinds of interdigital SRRs with Schottky diodes enables multi-frequency multi-bit AM programmable. As a demonstration, a dual-frequency device was fabricated and characterized, which achieved significant multi-bit AM from −12.5 to −6.2 dB at 34.7 GHz and from −26 to −8.5 dB at 50 GHz independently and showed programmable capability.

scholarly journals Rapid Determination of Fluoroquinolone Residues in Honey by a Microbiological Screening Method and Liquid Chromatography

2010 ◽  
Vol 93 (4) ◽  
pp. 1331-1339 ◽  
Author(s):  
Maki Kanda ◽  
Tomoto Kusano ◽  
Setsuko Kanai ◽  
Hiroshi Hayashi ◽  
Yoko Matushima ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Efficient Method ◽  
Rapid Determination ◽  
Screening Method ◽  
Microbiological Method ◽  
Metal Free ◽  
Spe Method

Abstract A rapid and efficient method was developed for the simultaneous determination of seven fluoroquinolone (FQ) residues: norfloxacin, ciprofloxacin, danofloxacin, enrofloxacin, orbifloxacin, sarafloxacin, and difloxacin in honey. The samples were first screened with a microbiological method by using test plates made from metal-free purified agar seeded with Bacillus subtilis BGA. When a sample was found to contain FQ residues by using the microbiological method, it was analyzed by LC with fluorescence detection (LC/FL). FQs were extracted with Na2EDTA-McIlvaine buffer and purified by a dual SPE method in which a cation-exchange cartridge was connected to an anion-exchange cartridge. The overall recoveries of the seven FQs ranged from 70.0 to 92.1. The intra-assay and interassay CVs were 7.8 and 5.1, respectively. For the microbiological method, the LOD values ranged from 2 to 9 g/kg. For LC/FL, the LOQ values ranged from 2 to 7 g/kg. The developed method was used to analyze 70 honey samples. In 14 samples in which the microbiological method detected the presence of FQ residues, norfloxacin, ciprofloxacin, and enrofloxacin were identified by LC/FL.

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