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Effects of annealing holding time on capacitance performance of RuO2–IrO2–graphene/Ti electrodes
Yanhong Wang,Shanfeng Huang,Jie Guo,Qiongqiong Ma,Yanqun Shao,Kongfa Chen,Dian Tang 한국물리학회 2019 Current Applied Physics Vol.19 No.7
The thermal decomposition method was used to prepare composite electrodes of the Ruthenium oxide–Iridium oxide–Graphene (RuO2–IrO2–G). Scanning Electron Microscopy (SEM), X–ray diffraction analysis (XRD), and electrochemical tests were used to study the influence of different annealing holding time on the surface morphology, phase composition, and capacitive performance of the coatings. The results showed that more and more RuO2, IrO2 nanoparticles were observed on the surface and cracks of the coating as the annealing holding time increasing. The RuO2–IrO2–G/Ti electrode was obtained by annealing for 5 h. The coating of the electrode consists of a certain amount of amorphous phase and nano–crystalline phase, and it had good electronic conductivity and ionic conductivity. At the same time, the electrode was prepared at 5 h had the largest specific capacitance of 778.46 F/g, which increased by 430.89 F/g than the electrode was prepared at 1 h. In addition, the electrode also had superior capacitance performance, capacitance retention and power characteristics.
Zeng Yanhong,Tang Yong,Gan Tian,Wu Can 한국탄소학회 2024 Carbon Letters Vol.34 No.3
Flexible self-supported laser-induced graphene (LIG) electrode devices were facilely fabricated through laser ablation technique by employing commercial polyimide film as the precursor material. Compared with the widely used traditional glassy carbon electrodes, the resulted LIG electrodes displayed abundant porous structure and surface defects. Notably, the one-step yielded LIG electrode devices were endowed with large electrochemically active surface area and accelerated electron transfer ability. Benefiting from its superior electrochemical property, these unmodified LIG electrodes exhibited remarkable enhanced electrochemical oxidation reactivity toward the food additive molecule Allura Red. Based on the augmented oxidation signal of Allura Red molecules on the LIG electrodes, a novel electrochemical sensor with high sensitivity for the detection of Allura Red was successfully developed. The sensor demonstrated a linear detection range spanning from 5 nM to 1 μM and exhibited a detection limit as low as 2.5 nM. Besides, the sensitivity was calculated to be 240.62 µA μM−1 cm−2. More importantly, the sensor manifested outstanding stability, reproducibility, and practicality, further emphasizing its potential for real-world application.
변보영,Yanhong Liu,Juming Tang,강동현,조홍연,황한준,마재형 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.3
To evaluate a heat-shock condition for the enumeration of Clostridium sporogenes spores, a surrogate for C. botulinum spores, we examined the heat tolerance of C. sporogenes spores and vegetative cells exposed to a heat shock at 90^oC. From the D values of the spores determined in the temperature range of 113-121^oC, z value (±SD) and D90°C value were estimated to be 10.16±0.90^oC and 1,071.52 min, respectively, and the inactivation rates were predicted to be only approximately 2% at 90^oC for up to 10min. Meanwhile, the viable count of spores was significantly higher when activated under a heat-shock condition of 90^oC for over 9 min than those activated for shorter time periods. The heat tolerance of vegetative cells was extremely low, showing a D90°C value (±SD) of 0.21±0.01 min. Finally, 3 different heat-shock conditions were compared:70^oC for 30 min, 80^oC for 20 min, and 90^oC for 10 min,and the experimental comparative data showed no significant differences in viable spore counts. Consequently, these results support that the heat-shock treatment at 90^oC for 10min is suitable to activate spores and to inactivate vegetative cells of C. sporogenes.
Rongjiang Tang,Yizhu Zhao,YuBin Gu,Zeyu You,Yanhong Wei,Ming Zhao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
The flow-induced vibration of a circular cylinder with a hollow section that is mounted at the rear is investigated in this work via numerical simulation. The Reynolds number was limited in the range of 6918-1511 by using reduced velocity that corresponds to Ur = 2-12. Five typical center-to-center distance ratios L/D of 3, 4, 5, 6, and 7 and three hollow section positions of left bias, up bias, and middle of cylinder were selected. The displacement time history curve and short-time Fourier transform diagram show that when L/D = 3 and Ur = 3, the cylinder with the hollow position in the middle initially entered the main frequency vibration for 5.64 s, but when L/D = 4 and Ur = 6, the drag coefficient time history curve of the cylinder biased to the left and up at the hollow position demonstrated a "beating" phenomenon, and multiple frequency peaks appeared on the fast Fourier transform diagram.
Antinociceptive effects of oleuropein in experimental models of neuropathic pain in male rats
( Huayong Chen ),( Dandan Ma ),( Huapeng Zhang ),( Yanhong Tang ),( Jun Wang ),( Renhu Li ),( Wen Wen ),( Yi Zhang ) 대한통증학회 2021 The Korean Journal of Pain Vol.34 No.1
Background: The present investigation explored the therapeutic actions of oleuropein along with the possible signaling pathway involved in attenuating neuropathic pain in chronic constriction injury (CCI) and vincristine-induced neuropathic pain in male rats. Methods: Four loose ligatures were placed around the sciatic nerve to induce CCI, and vincristine (50 μg/kg) was injected for 10 days to develop neuropathic pain. The development of cold allodynia, mechanical allodynia, and mechanical hyperalgesia was assessed using different pain-related behavioral tests. The levels of H<sub>2</sub>S, cystathionine-γ-lyase (CSE), cystathionine-β-synthase (CBS), orexin, and nuclear factor erythroid-2-related factor 2 (Nrf2) were measured in the sciatic nerve. Results: Treatment with oleuropein for 14 days led to significant amelioration of behavioral manifestations of neuropathic pain in two pain models. Moreover, oleuropein restored both CCI and vincristine-induced decreases in H<sub>2</sub>S, CSE, CBS, orexin, and Nrf2 levels. Co-administration of suvorexant, an orexin receptor antagonist, significantly counteracted the pain-attenuating actions of oleuropein and Nrf2 levels without modulating H<sub>2</sub>S, CSE and CBS. Conclusions: Oleuropein has therapeutic potential to attenuate the pain manifestations in CCI and vincristine-induced neuropathic pain, possibly by restoring the CSE, CBS, and H<sub>2</sub>S, which may subsequently increase the expression of orexin and Nrf2 to ameliorate behavioral manifestations of pain.
Microwave Absorption Enhancement of Fe/C Core–Shell Hybrid Derived from a Metal-Organic Framework
Liuyang Heng,Zilong Zhang,Shuai Wang,Xiqiao Chen,Xiubo Jia,Zhixiang Tang,Yanhong Zou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
Core–shell structured Fe/C have been successfully derived from a metal-organic framework for microwave absorbing. Based on the measured electromagnetic parameters, it is found that the maximum reflection loss (RL) of Fe/C reaches 40 dB at 5.8 GHz with a thickness of 3.0 mm and the broadest absorption bandwidth (RL < -10 dB) is up to 6.0 GHz (from 11.2 to 17.2 GHz) with a thickness of 1.5 mm. The excellent microwave absorption is mainly ascribed to the multiple reflections, good impedance matching, dielectric loss and interface polarization originating from the core–shell structure. It is believed that Fe/C can be a promising microwave absorbing material.
Maximum Canopy Height Estimation Using ICESat GLAS Laser Altimetry
Park, Tae-Jin,Lee, Woo-Kyun,Lee, Jong-Yeol,Hayashi, Masato,Tang, Yanhong,Kwak, Doo-Ahn,Kwak, Han-Bin,Kim, Moon-Il,Cui, Guishan,Nam, Ki-Jun The Korean Society of Remote Sensing 2012 大韓遠隔探査學會誌 Vol.28 No.3
To understand forest structures, the Geoscience Laser Altimeter System (GLAS) instrument have been employed to measure and monitor forest canopy with feasibility of acquiring three dimensional canopy structure information. This study tried to examine the potential of GLAS dataset in measuring forest canopy structures, particularly maximum canopy height estimation. To estimate maximum canopy height using feasible GLAS dataset, we simply used difference between signal start and ground peak derived from Gaussian decomposition method. After estimation procedure, maximum canopy height was derived from airborne Light Detection and Ranging (LiDAR) data and it was applied to evaluate the accuracy of that of GLAS estimation. In addition, several influences, such as topographical and biophysical factors, were analyzed and discussed to explain error sources of direct maximum canopy height estimation using GLAS data. In the result of estimation using direct method, a root mean square error (RMSE) was estimated at 8.15 m. The estimation tended to be overestimated when comparing to derivations of airborne LiDAR. According to the result of error occurrences analysis, we need to consider these error sources, particularly terrain slope within GLAS footprint, and to apply statistical regression approach based on various parameters from a Gaussian decomposition for accurate and reliable maximum canopy height estimation.