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Extraction of Reducing Sugar with Anti-Oxidative Scavengers from Peels of Carya cathayensis Sarg.
Toshinori Shimanouchi,Shohei Ueno,Wei Yang,Yukitaka Kimura 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.1
The peels of Carya cathayensis Sarg. (PCCS) were treated under subcritical water conditions (130°C to 280 °C for 0 to 120 min). The extract from PCCS included reducing sugar, proteins, and compounds with radical scavenging activity. Addressing the reducing sugar that is a resource of bioethanol, we could maximize the reducing sugar under the subcritical water (190°C for 60 min) and obtain 0.24g/g-sample together with 9.7 units/mg-sample of radical scavenging activity. The obtained extract was estimated to correspond to 1L of bioethanol/100 g-sample. It was therefore considered that the treatment by subcritical water could yield reducing sugar and natural compounds with radical scavenging activity.
Free Spectral Range Measurement of Fabry-Perot Cavity using Frequency Modulation
Masato Aketagawa,Takuya Yashiki,Shohei Kimura,Tuan Quoc Banh 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
In this paper, we propose a novel method to measure the free spectral range (FSR) of a Fabry-Perot cavity (FPC)using single-frequency modulation (FM) with one electric optical modulator (EOM) and the null method. A laser beam modulated by the EOM, to which a cosine-wave signal is supplied from a radio frequency (RF) oscillator, is incident on the FPC. The transmission light from the FPC is observed and converted to an RF signal by a highspeed photodetector, and the RF signal is synchronously demodulated with a lock-in amplifier (LIA) by referring to the oscillator. We theoretically and experimentally demonstrate that the LIA signal become null with a steep slope, when the modulation frequency equals the FSR under the condition that the carrier frequency is slightly detuned from the resonance of the FPC. The experimental results show that the proposed method has the capability to determine the FSR by the null method with a small measurement uncertainty.