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Zhong Zaimin,Shao Zhongshu,Bao Yong 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
The real-time simulation platform of constant d–q axis inductance parameter permanent magnet synchronous motor model only considers the fundamental wave of magnetic fi eld and it cannot accurately describe the spatial harmonic characteristics of the motor. Thus, this platform is not applicable in the developing and testing of control algorithms suppressing torque ripple and harmonic current. Aiming at this problem, a hardware-in-the-loop platform is built using an analytical motor model called “distributed parameter model” based on magnetic co-energy reconstruction. This model describes the variation of magnetic co-energy, fl ux linkage, voltage and torque with reference to rotor spatial position. So, it can accurately refl ect the nonlinear characteristics including saturation, slotting eff ects and non-sinusoidal back-EMF. The model is numerically discretized and compiled by Verilog hardware language in FPGA, then tested with closed-loop FOC control algorithm. The real-time simulation can verify the control algorithm with real controller and the simulation step of the motor model is 1 μs. Compared with the bench test results of the actual motor, the spatial harmonic characteristics of the motor in the real-time simulation platform are verifi ed.
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Shao-rui Chen,Wen-ping Zhang,Jing-mei Bao,Zhong-bin Cheng,Sheng Yin 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.1
Aristoyunnolin H is a novel aristophyllenesesquiterpenoid isolated from the traditional Chinese medicineAristolochia yunnanensis Franch. The presentresearch was designed to explore the anti-fibrotic effects ofaristoyunnolin H in adult rat cardiac fibroblasts (CFs)stimulated with angiotensin II (Ang II). Western blotanalysis data showed that aristoyunnolin H reduced theupregulation of fibronectin (FN), connective tissue growthfactor and collagen I(Col I) production induced by Ang II inCFs. By studying the dynamic intracellular changes ofCa2?, we further found that while aristoyunnolin H relievedthe calcium influx, it has no effect on intracellular calciumstore release. Meanwhile, aristoyunnolin H also inhibitedthe Ang II-stimulated phosphorylation of Ca2?/calmodulindependentprotein kinase II. In conclusion, aristoyunnolin Hmay attenuate extracellular matrix secretion in vitro byinhibiting Ang II-induced calcium signaling.
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One-pot preparation of LiFePO4/C composites
Juan Wang,Ji-Yu Li,Zhong-Bao Shao,Hong-Tao Fan,Hong-Qiang Ru,Shu-Yan Zang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.2
A convenient one-pot method, called high-temperature high-energy mechanical force (HTHEMF), was successfully developed for the preparation of LiFePO4/C composites. Upon the combination of high-temperature with high-energy mechanical force, the whole synthesis process of this method is very simple and only involves two steps, the precursor preparation and the calcination step. The results of XRD, SEM, BET and electrochemical performance tests indicated that after calcination at 600 oC for 9 h, the LiFePO4/C composites have the best properties. The discharge capacity of the composites was 150.3mA h g−1 at 0.1 C. After 30 cycles test, the reversible capacity was 147mA h g−1 and the retention ratio to the initial capacity was 97.8%. The results indicated that LiFePO4/C composites with good properties can be obtained by one-pot HTHEMF method.
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