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Your search keyword '"Liu, Meng-Wei"' showing total 27 results
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27 results on '"Liu, Meng-Wei"'

7. A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform.

Author

Ru, Peng‐Lei, Liu, Meng‐Wei, Gong, Jun‐Jie, Wang, Wen, and Zhu, Hao‐Tian

Subjects
*SPECTRUM analyzers, *ACOUSTIC surface waves, *BANDWIDTHS
Abstract

With the advantages of low power consumption and high stability, chirp transform spectrometer (CTS) has become a powerful tool widely used in spectrum analysis today. In recent years, compared with other spectrum analyzers, CTS is limited by the lack of bandwidth, which severely restricts its application and development. In this article, a CTS system with a wide bandwidth is proposed. The chirp signal with 2 GHz bandwidth is generated by DAC and multiplier, and its dispersion characteristics are matched with a 1 GHz bandwidth surface acoustic wave (SAW) filter to build a spectrum analyzer with an analysis bandwidth of 1 GHz. Experimental results show that the system frequency resolution can reach up to 102 kHz, which is very close to the theoretical value (100 kHz). [ABSTRACT FROM AUTHOR]

Published
2022
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22. Cover Picture: Eur. J. Immunol. 4/10

Author

Lin, Bo-Shiou, primary, Tsai, Pei-Yun, additional, Hsieh, Wan-Yun, additional, Tsao, Hsiao-Wei, additional, Liu, Meng-Wei, additional, Grenningloh, Roland, additional, Wang, Li-Fang, additional, Ho, I-Cheng, additional, and Miaw, Shi-Chuen, additional

Published
2010
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23. SUMOylation attenuates c-Maf-dependent IL-4 expression

Author

Lin, Bo-Shiou, primary, Tsai, Pei-Yun, additional, Hsieh, Wan-Yun, additional, Tsao, Hsiao-Wei, additional, Liu, Meng-Wei, additional, Grenningloh, Roland, additional, Wang, Li-Fang, additional, Ho, I-Cheng, additional, and Miaw, Shi-Chuen, additional

Published
2010
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25. Design and Fabrication of a MEMS Flexural Plate Wave Device Based on LTO/ZnO/LTO/Si3N4 Multilayered Composite Membrane

Author

Xue, Ming Xin, Liu, Meng Wei, Li, Xin, and Li, Jun Hong

Abstract

The MEMS A0 mode Lamb wave (flexural plate wave) ultrasonic devices have been shown to be extremely useful for sensor and actuator applications. The design and fabrication process of a MEMS flexural plate wave device based on the LTO/ZnO/LTO/Si3N4 multilayered composite membrane are presented. The flexural plate wave was respectively launched and received by both Al interdigital transducers. In order to reduce the stress of the thin membrane induced mainly by the in-plane compressive stress of ZnO film, two fabrication process of DC and RF magnetron sputtering were used to deposit the ZnO films, respectively. The FPW device based on LTO(0.2μm)/ZnO(1μm)/ LTO(2μm)/Si3N4(0.5μm) thin membrane was fabricated. The center frequency of the MEMS flexural plate wave device is measured at 3.69MHz, which agrees with the theoretical predictions.

Published
2012
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27. [Quenched fluorescein: a reference dye for instrument response function of TCSPC].

Author

Pan HF, Ding JX, Liang RR, Tao ZD, Liu MW, Zhang SJ, and Xu JH

Abstract

Measuring the instrument response function (IRF) and fitting by reconvolution algorithms are routines to improve time resolution in fluorescence lifetime measurements. Iodide ions were successfully used to quench the fluorescence of fluorescein in this study. By systematically adding saturated NaI water solution in basic fluorescein solution, the lifetimes of fluorescein were reduced from 4 ns to 24 ps. The quenched lifetime of fluorescein obtained from the analysis of Time-Correlated Single Photon Counting (TCSPC) measurement agrees well with that from femtosecond frequency up-conversion measurement. In time resolved excitation spectra measurements, the IRF should be measured at various detection wavelengths providing scattring materials are used. This study could not only reduce the complexity of IRF measurement, but also avoid the existing color effect in system. This study should have wide applications in time resolved fluorescence spectroscopy and fluorescence lifetime imaging.

Published
2014

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