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RISS 인기검색어
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- 저자 : Shenghai Zhou (검색결과 5 건)
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Shenghai Zhou,Hongbo Xu,Yanjun Wei,Jing Gao,Yue Feng,Ning Wang,Junfeng Gao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8
Heteroatom-doped ordered mesoporous carbons (OMCs) have currently been considered as promising electrode materials for electrochemical sensors due to the combined advantages of ordered mesoporous materials and heteroatom-doped carbon materials. Herein, a novel nitrogen and sulfur co-doped OMCs (N,S-OMC) has been prepared via a nanocasting strategy with an inexpensive methylene blue as single precursor. The obtained mesoporous carbon has platelet morphology, short mesoporous channel together with a large surface area (549 m2/g) as well as rich N- and S-containing functional groups (6.8 at.% N and 2.3 at.% S). Compared with the graphene (GR) and carbon nanotube (CNT) electrode material, the N,S-OMC exhibited a higher electrochemical activity towards the oxidation of herbicide amitrole, ascribable to N,S-OMC's open mesoporous structures and abundant electroactive defect sites on the carbon skeleton. And, an amitrole electrochemical sensor with N,S-OMC modified electrode as working electrode was fabricated, exhibiting a good selectivity, stability, reproducibility and wide linear range of 3–750 μM. Moreover, the N,S-OMC-based electrochemical sensor was proved feasible in river water sample analyses, showing a satisfied recovery ranging from 97.03% to 105.42%. The results not only demonstrate cheap methylene blue can be used as single precursor for the N,S-OMC preparation, but also confirm the N,S-OMC is promising in amitrole sensor fabrication.
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Shenghai Hu,Manhui Zhang,Chao Zhou,Feihong Tian 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
This paper proposes a novel self-calibration method to calibrate the accurate kinematic parameters of serial manipulators. First, a modified POE-based calibration model was established together with the modeling, identification and correction steps. It eliminates the joint offset errors and the dependent constrained parameters of joint screw errors in traditional POE-based models, which has completeness, continuity and minimality properties simultaneously and avoids normalization and orthogonalization operations. It also eliminates transformation errors of position detection information through adopting distance accuracy definition. Then, focusing on measurement step, the flowchart in a virtual closed-loop form is constructed with an infrared laser beam device and a simple observation surface. Meanwhile, the selection procedure for measurement configurations is figured out to determine the optimal number and the corresponding calibration set. Finally, experimental studies were conducted on a self-developed serial manipulator. The results of self-calibration experiments show that the proposed method is feasible and effective, and the distance accuracy could be improved by 73.64 % after performing optimal type. The results of comparison experiments with traditional external or self-calibration methods indicate that the proposed method could further improve convergence property and achievable accuracy of calibration effects, which also outperforms in terms of simplicity and accuracy.
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Torque Ripple Minimization in Direct Torque Control of Brushless DC Motor
Zhenguo Li,Songfa Zhang,Shenghai Zhou,Jin-Woo Ahn 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.5
This paper mainly proposes a direct torque control strategy to minimize torque ripple in brushless DC (BLDC) motor. BLDC motor has large current and torque ripple when one voltage vector applied in one cycle due to its low inductance. Hence, this paper proposed a hysteresis torque control with PWM mode to control the resultant torque. Moreover, when the direct torque control system is operating during the two-phase half-bridge 120° conduction mode, large torque ripple in commutation area appears every 120 electrical degree. Based on analyzing the root of torque ripple in detail, lookup tables of switching devices states for new half-bridge modulation mode in the positive and negative reference torque put forwarded. Finally, simulations by MATLAB software and experiment results from DSP are presented to verify the feasibility and effectiveness of the proposed strategy operating in four-quadrant operation.
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Torque Ripple Minimization in Direct Torque Control of Brushless DC Motor
Li, Zhenguo,Zhang, Songfa,Zhou, Shenghai,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.5
This paper mainly proposes a direct torque control strategy to minimize torque ripple in brushless DC (BLDC) motor. BLDC motor has large current and torque ripple when one voltage vector applied in one cycle due to its low inductance. Hence, this paper proposed a hysteresis torque control with PWM mode to control the resultant torque. Moreover, when the direct torque control system is operating during the two-phase half-bridge $120^{\circ}$ conduction mode, large torque ripple in commutation area appears every 120 electrical degree. Based on analyzing the root of torque ripple in detail, lookup tables of switching devices states for new half-bridge modulation mode in the positive and negative reference torque put forwarded. Finally, simulations by MATLAB software and experiment results from DSP are presented to verify the feasibility and effectiveness of the proposed strategy operating in four-quadrant operation.
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Piao, Zhonglie,Ma, Teng,Li, Jiawen,Wiedmann, Maximilian T.,Huang, Shenghai,Yu, Mingyue,Kirk Shung, K.,Zhou, Qifa,Kim, Chang-Seok,Chen, Zhongping American Institute of Physics 2015 Applied Physics Letters Vol.107 No.8
<P>Intravascular photoacoustic imaging at 1.7 mu m spectral band has shown promising capabilities for lipid-rich vulnerable atherosclerotic plaque detection. In this work, we report a high speed catheter-based integrated intravascular photoacoustic/intravascular ultrasound (IVPA/IVUS) imaging system with a 500 Hz optical parametric oscillator laser at 1725 nm. A lipid-mimicking phantom and atherosclerotic rabbit abdominal aorta were imaged at 1 frame per second, which is two orders of magnitude faster than previously reported in IVPA imaging with the same wavelength. Clear photoacoustic signals by the absorption of lipid rich deposition demonstrated the ability of the system for high speed vulnerable atherosclerotic plaques detection. (C) 2015 AIP Publishing LLC.</P>
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