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36 results on '"Guo, Donglai"'

8. Protective effect of Rhus chinensis Mill. extract against liver cirrhosis in rats

Author

Pan, Zirong, Cheng, Qiang, Chen, Heyan, Lin, Longhai, Liao, Weijia, Guo, Donglai, and Zhuang, Jianmin

Subjects
Pharmaceutical Science, Rhus chinensis Mill., Liver cirrhosis, Diethylnitrosamine, Alanine transaminase, Aspartate aminotransferase, Pharmacology (medical)
Abstract

Purpose: To study the effect of Rhus chinensis Mill. extract (RCME) on diethylnitrosamine (DEN)-induced liver cirrhosis in rats. Methods: RCME was obtained by extracting the dried Rhus chinensis Mill. in water. Liver cirrhosis rat model was prepared by injecting with DEN once a week for 8 weeks. After 8th-week of RCME treatment, biochemical index and oxidative stress were determined in DEN-induced liver cirrhosis in rats. Results: Compared with model group, plasma concentrations of alanine transaminase (ALT, 125.3 ± 4.1 U/L) and aspartate aminotransferase (AST, 152.4 ± 3.5 U/L) decreased significantly (p < 0.01) in the 8th week. Rhus chinensis Mill. extract (RCME) significantly decreased malondialdehyde (MDA, 0.18 ± 0.02 umol/L) and superoxide dismutase (SOD, 0.76 ± 0.05 U/mg protein) in DEN-induced liver cirrhosis in rats (p < 0.01) when compared with model group. Conclusion: RCME protects against diethylnitrosamine-induced liver cirrhosis in rats. However, further investigations are required to ascertain the plant extract’s suitability for the clinical management of liver cirrhosis.

Published
2022

15. Tapered multicore fiber interferometer for refractive index sensing with graphene enhancement

Author

Cheng Du, Qinyou Li, Lijun Wu, Farhan Mumtaz, Guo Donglai, Wenbin Hu, Hongxing Yu, and Ai Zhou

Subjects
Coupling, Materials science, Graphene, business.industry, Tapering, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Interferometry, Optics, Fiber optic sensor, law, 0103 physical sciences, Astronomical interferometer, Fiber, Electrical and Electronic Engineering, business, Engineering (miscellaneous), Refractive index
Abstract

An in-line, highly sensitive refractive index (RI) sensor based on a tapered multicore fiber (MCF) structure sandwiched between two single-mode fibers is proposed and demonstrated. The fiber tapering technique was employed to fabricate in-line interferometers based on the multicore fiber. The waist diameter is one of the dominant factors of the intercore coupling. The tapered MCF interferometer is highly sensitive to the surrounding refractive index with a maximum sensitivity of 9194.6 nm/RIU in the RI range of 1.4264 to 1.4278 when the waist diameter is 9 µm. The enhancement of the evanescent field by graphene coating is proved to be able to improve the RI sensitivity further. A graphene-coated MCF interferometer with waist diameter of 9 µm offers the maximum sensitivity of 12617.6 nm/RIU in the RI range of 1.4144 to 1.4159. The experimental data have good agreement with the simulated results.

Published
2020

18. Refractive index interferometer based on SMF-MMF-TMCF-SMF structure with low temperature sensitivity

Author

Guo Donglai, Farhan Mumtaz, Wenbin Hu, Cheng Du, Pu Cheng, Minghong Yang, and Xiaoqiao Luo

Subjects
Multi-mode optical fiber, Temperature sensitivity, Materials science, Optical fiber, Temperature sensing, business.industry, 02 engineering and technology, Cladding (fiber optics), 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Highly sensitive, law.invention, 010309 optics, Interferometry, 020210 optoelectronics & photonics, Optics, Control and Systems Engineering, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, business, Instrumentation, Refractive index
Abstract

An optic fiber refractive index (RI) sensor based on SMF-MMF-TMCF-SMF (SMTmS) structure is proposed. The MMF segment is introduced and confirmed theoretically and experimentally to act as an efficient optical coupler to launch the light from the center core to the cladding. Experimental results demonstrate that SMTmS is highly sensitive (1435.76 nm/RIU) to low surrounding RI in the range of 1.3330–1.3451. The temperature sensing has been implemented and the total wavelength shift of only 1.83 nm is achieved for the range of 30 °C–100 °C, implying a relatively low temperature cross-sensitivity of 2.01 × 10−5 RIU/°C. The developed sensor with high RI sensitivity and low temperature cross-sensitivity could be rather suitable and applicable in the fields of seawater sensing and environmental monitoring.

Published
2020

27. Influence of Dynamic Load on the Mechanical and Electrical Performance of Structurally Integrated Antenna

Author

Song Liwei, Zhou Jinzhu, Du Leigang, and Guo Donglai

Subjects
Imagination, Chemical substance, Computer science, Applied Mathematics, Mechanical Engineering, media_common.quotation_subject, Mechanical engineering, 01 natural sciences, Dynamic load testing, Computer Science Applications, 0103 physical sciences, Integrated antenna, Electrical performance, 010303 astronomy & astrophysics, Simulation, media_common
Published
2016

30. CrSi2 Hexagonal Nanowebs

Author

Wang, Huatao, primary, Wu, Jian-Chun, additional, Shen, Yiqiang, additional, Li, Gongping, additional, Zhang, Zhou, additional, Xing, Guozhong, additional, Guo, Donglai, additional, Wang, Dandan, additional, Dong, Zhili, additional, and Wu, Tom, additional

Published
2010
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35. Multicomponent Gas Sensing Fiber Probe System Based on Platinum Coated Capillary Enhanced Raman Spectroscopy.

Author

Yang M, Liu Z, Nie Q, Cheng M, Pei S, Yang D, Cheng C, and Guo D

Subjects
Gases analysis, Gases chemistry, Carbon Dioxide analysis, Limit of Detection, Spectrum Analysis, Raman methods, Spectrum Analysis, Raman instrumentation, Platinum chemistry, Optical Fibers
Abstract

This paper proposes a novel multicomponent gas-sensing optical fiber probe system. It utilizes a precisely engineered Platinum-coated capillary fabricated via Atomic Layer Deposition (ALD) technology as the core for enhanced Raman spectroscopy, marking the first application of ALD in creating such a structure for gas Raman sensing. The noble metal capillary gas Raman probe demonstrates a low detection limit of 55 ppm for CO 2 with a 30 s exposure time and good repeatability in multicomponent gas sensing. The capillary exhibits excellent stability, environmental resistance, and a large core diameter, enabling a rapid gas exchange rate and making it suitable for practical applications.

Published
2024
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36. Antiresonant fiber-enhanced Raman spectroscopy gas sensing with 1 ppm sensitivity.

Author

Yang M, Liu Z, Xiong L, Nie Q, Wang Y, Gao S, Cheng M, Yang D, Pei S, and Guo D

Abstract

Antiresonant hollow-core fiber (AR-HCF) exhibits unprecedented optical performance in low transmission attenuation, broad transmission bandwidth, and single spatial mode quality. However, due to its lower numerical aperture, when utilizing the Fiber-Enhanced Raman Spectroscopy (FERS) principle for gas detection, the efficiency of AR-HCF in collecting Raman signals per unit length is significantly lower than that of hollow-core photonic crystal fiber. Nonetheless, AR-HCF effectively suppresses higher-order modes and offers bandwidth in hundreds of nanometers. By increasing the length of AR-HCF, its advantages can be effectively harnessed, leading to a considerable enhancement in the system's ability for low-concentration gas detection. We combine the nodeless antiresonant hollow-core fiber and Raman spectroscopy for enhanced Raman gas sensing in a forward scattering measurement configuration to investigate the attenuation behavior of the silica background signals. The silica background attenuation behavior enables the low baseline of the gas Raman spectroscopy and extends the integration time of the system. In addition, a convenient spatial filtering method is investigated. A multimode fiber with a suitable core diameter was employed to transmit the signal so that the fiber end face plays the role of pinhole, thus filtering the silica signal and reducing the baseline. The natural isotopes 12 C 16 O 2 , 13 C 16 O 2 , and 12 C 18 O 16 O in ambient air can be observed using a 5-meter-long AR-HCF at 1 bar with a laser output power of 1.8 W and an integration time of 300 seconds. Limits of detection have been determined to be 0.5 ppm for 13 C 16 O 2 and 1.2 ppm for 12 C 16 O 2 , which shows that the FERS with AR-HCF has remarkable potential for isotopes and multigas sensing.

Published
2024
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