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| 1 | Synergistic Effect between Zr-MOF and Phosphotungstic Acid for Oxidative Desulfurization显示文摘PTA/UiO-66 composites were successfully synthesized by the hydrothermal method.The results showed that the synergistic effect between phosphotungstic acid(PTA)and UiO-66 could enhance the oxidative desulfurization(ODS)activity.The XRD results proved that UiO-66 retained its structure in the PTA/UiO-66 composites.The SEM results showed that the PTA/UiO-66 catalysts exhibited regular octahedral shape.The Raman spectra revealed that PTA in the composites retained the Keggin structure.The XPS results showed that the electron transfer occurred from Zr-MOF to PTA.The ODS reaction mechanism was discussed.Electrons transfer from Zr-MOF to PTA can promote the generation of active species(·OH)and thus enhance the ODS activity.This explanation can be confirmed by the formation of oxygen vacancy and W0 as revealed by the XPS analysis. | Zong Mengya Zhao Yutong Fan Cunzheng Wang Danhong | 2020 | China Petroleum Processing & Petrochemical Technology2020，22，4： | 5 |
| 2 | Ultra-high resolution strain sensor network assisted with an LS-SVM based hysteresis model显示文摘Optical fiber sensor network has attracted considerable research interests for geoscience applications.However,the sensor capacity and ultra-low frequency noise limits the sensing performance for geoscience data acquisition.To achieve a high-resolution and lager sensing capacity,a strain sensor network is proposed based on phase-sensitive op-tical time domain reflectometer(φ-OTDR)technology and special packaged fiber with scatter enhanced points(SEPs)ar-ray.Specifically,an extra identical fiber with SEPs array which is free of strain is used as the reference fiber,for com-pensating the ultra-low frequency noise in theφ-OTDR system induced by laser source frequency shift and environment temperature change.Moreover,a hysteresis operator based least square support vector machine(LS-SVM)model is in-troduced to reduce the compensation residual error generated from the thermal hysteresis nonlinearity between the sensing fiber and reference fiber.In the experiment,the strain sensor network possesses a sensing capacity with 55 sensor elements.The phase bias drift with frequency below 0.1 Hz is effectively compensated by LS-SVM based hyster-esis model,and the signal to noise ratio(SNR)of a strain vibration at 0.01 Hz greatly increases by 24 dB compared to that of the sensing fiber for direct compensation.The proposed strain sensor network proves a high dynamic resolution of 10.5 pε·Hz-1/2 above 10 Hz,and ultra-low frequency sensing resolution of 166 pεat 0.001 Hz.It is the first reported a large sensing capacity strain sensor network with sub-nεsensing resolution in mHz frequency range,to the best of our knowledge. | Tao Liu Hao Li Tao He Cunzheng Fan Zhijun Yan Deming Liu Qizhen Sun | 2021 | Opto-Electronic Advances2021，4，5： | 4 |
| 3 | Effect of Doped Vanadium Dioxide on Oxidative Desulfurization Reaction显示文摘VO2(M) doped with different metals(Ti, Ce, Nb, Zr, W, and Mo) was successfully synthesized by the hydrothermal reduction process using oxalic acid as the reductant. The results showed that doping metals in the VO2(M) lattice could enhance the oxidative desulfurization(ODS) activity. The DSC and Raman spectra revealed that VO2(M) retained its monoclinic structure after doping. Mechanism for the improvement of ODS activity by doping was investigated. Electron transfer to V(V) atom occurs upon doping, and then V(V) changes into V(IV), which can promote the ODS reaction. This explanation can be confirmed by the fact that doping can promote the proportion of V(Ⅳ) after doping as revealed by the XPS analysis. | Zhao Yutong Zong Mengya Fan Cunzheng Chen Kun Wang Danhong Zhang Minghui | 2019 | China Petroleum Processing & Petrochemical Technology2019，21，4： | 4 |
| 4 | Time-slot multiplexing based bandwidth enhancement for fiber distributed acoustic sensing显示文摘Dear editor,The phase-sensitive optical time-domain reflectometry(φ-OTDR)has been demonstrated as the most common technique in fiber distributed acoustic sensing(DAS).However,traditional φ-OTDR based DAS suffered from the inherent trade-off between the maximum frequency response and the distance which can be characterized by distance bandwidth product(DBP),since the time interval of the probe pulses should be larger than the pulse round-trip flight time. | Hao LI Cunzheng FAN Tao LIU Yujia LIU Zhijun YAN Perry SHUM Qizhen SUN | 2022 | Science China(Information Sciences)2022，65，1： | 2 |
| 5 | 300 km ultralong fiber optic DAS system based on optimally designed bidirectional EDFA relays显示文摘Optical fiber distributed acoustic sensing(DAS)based on phase-sensitive optical time domain reflectometry(φ-OTDR)is in great demand in many long-distance application fields,such as railway and pipeline safety monitoring.However,the DAS measurement distance is limited by the transmission loss of optical fiber and ultralow backscattering power.In this paper,a DAS system based on multispan relay amplification is proposed,where the bidirectional erbium-doped fiber amplifier(EDFA)is designed as a relay module to amplify both the probe light and the backscattering light.In the theoretical noise model,the parameters of our system are carefully analyzed and optimized for a longer sensing distance,including the extinction ratio(ER),span number,span length,and gain of erbium-doped fiber amplifiers.The numerical simulation shows that a bidirectional EDFA relay DAS system can detect signals over 2500 km,as long as the span number is set to be more than 100.To verify the effectiveness of the scheme,a six-span coherent-detection-based DAS system with an optimal design was established,where the cascaded acoustic-optic modulators(AOMs)were used for a high ER of 104 dB.The results demonstrate that the signal at the far end of 300.2 km can be detected and recovered,achieving a high signal-to-noise ratio of 59.6 dB and a high strain resolution of 51.8■at 50 Hz with a 20 m spatial resolution.This is,to the best of our knowledge,a superior DAS sensing distance with such a high strain resolution. | CUNZHENG FAN HAO LI KEQING ZHANG HUANHUAN LIU YIXIANG SUN HAOGUANG LIU BAOQIANG YAN ZHIJUN YAN DEMING LIU PERRY PING SHUM QIZHEN SUN | 2023 | Photonics Research2023，11，6： | 0 |
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