An Magnetostrictive Model for Grain-oriented Silicon Steel Sheet under Service Conditions Based on Improved Jiles-Atherton Model

Zhu Lihua(주리화),He Zhiwei(허지웨이),Chang-seop Koh(고창섭) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.7

Contribution of Magnetostriction and Electromagnetic Force to Transformer Core Vibration

Zhu Lihua(주리화),Li Weizheng(리웨이쳉),He Zhiwei(허지웨이),Chang-seop Koh(고창섭) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.7

Power transformer is widely used as the key equipment of power transmission system. At the same time, with the improvement of people"s awareness of environmental protection, the problem of core vibration in the operation of transformer has attracted more and more attention. The vibration of transformer core is mainly caused by magnetostriction(MS) and electromagnetic force(EF) and that the transformer corner is the concentrated reflection area is universally acknowledged. A three-dimensional model for a square ring core containing the overlap area of the corner is firstly developed and then the distribution of MS and EF and the vibration displacement caused by the two forces acting alone are calculated under normal working conditions. At the same time, the transformer may work in abnormal working conditions such as DC bias or harmonics, which will cause MS and EF to increase in varying degrees. The contribution of MS and EF to core vibration under different working conditions is analyzed and a conclusion is drawn that EF is much smaller than MS in normal working condition, but under abnormal working conditions, EF increases rapidly and should not be neglected.

A New Structure of a Gap-Reactor to Reduce Electromagnetic Vibrations

Zhu Lihua,Wang Qianchao,Sha Rui,Koh Chang-seop 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3

Magnetostriction is an inherent property of an electrical steel sheet (ESS). Experimental measurements have revealed that the magnetostrictions of Grain-oriented and Non-oriented ESSs are mostly opposite in their directions. Based on this, a novel structure of gap reactor is suggested to reduce the mechanical vibration of the reactor. The new structure follows the conventional manufacturing process, and is built by stacking Grain-oriented and Non-oriented cores alternately while a conventional one is by only Grain-oriented or Non-oriented core. In order to verify the eff ectiveness of the proposed structure, the electromagnetic vibration, stress and displacement of the reactor are analyzed based on the magneto-elastic coupled analysis. The measured magnetization and magnetostriction data of the ESSs are adopted during the numerical calculation. Prototypes of new and traditional structures with the same design parameters were also built and electromagnetic-induced vibration were measured and analyzed. Both the computational and experimental results showed that the proposed structure made much less electromagnetic vibration than the conventional one. Moreover, the noise level around the reactors were measured and the average noise level around the improved prototype was reduced by 16.7%.

Pharmacokinetics, tissue distribution and excretion of peimisine in rats assessed by liquid chromatography-tandem mass spectrometry

Lihua Chen,Dongxun Li,Guosong Zhang,Wei Zhang,Lihua Zhang,Yongmei Guan,Weifeng Zhu,Hongning Liu 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.6

Peimisine, the common ingredient of ‘‘zhebeimu’’groups and ‘‘chuanbeimu’’ groups, is responsiblefor the expectorant and cough relieving effects. The aim ofthis study was to investigate the pharmacokinetics, tissuedistribution and excretion of peimisine in male and femaleSD (Sprague-Dawley) rats by a rapid and sensitive LC-MS/MS (liquid chromatography-tandem mass spectrometry)method used carbamazepine as the internal standard afteroral administration, carbamazepine was stated as an IS. The results showed that peimisine was slowly distributed,and eliminated from rat plasma and manifested lineardynamics in a dose range of 0.26–6.5 mg/kg. Tested byANOVA, there were gender differences in the pharmacokineticparameters of AUC0-t, AUC0-? among a singledose of 0.26, 1.3, 6.5 mg/kg (P\0.05). Drug blood andtissue levels in male rats were significantly higher than thefemale counterparts after oral administration, while boththe males and the females showed high drug levels inspleen, kidney, lung, liver and heart. On the other hand, thepeimisine levels that can be reached in uterus, ovary, testisand brain is low. The excretion study showed that littleadministered peimisine (\0.7 %) was recovered in themale and female bile. Approximately 13.46 and 15.05 %were recovered in female urine and feces, while 43.07 and7.49 % were recovered in male urine and feces, respectively,which indicated that the major elimination route ofmale rats was urine excretion. In addition, there was significantdifferences in total cumulative excretive ratio ofpeimisine in feces (P\0.05) and no significant differencesin the urine (P[0.05) at a dose of 1.3 mg/kg.

The effect of clamping stress on the magnetic properties and vibration of amorphous alloy core

Lihua Zhu,Zhiwei He,Chang-Seop Koh 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.10

Double hysteresis loops induced by Mn doping in Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3 ferroelectric ceramics

Meng Jiang,Xuhai Li,Jiliang Zhu,Xiaohong Zhu,Wei Shi,Lihua Li,Dingquan Xiao,Jianguo Zhu 한국물리학회 2010 Current Applied Physics Vol.10 No.2

Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3 (PNZT95/5) ceramics with 1 mol% and without Mn doping were prepared via conventional solid state reaction process. X-ray diffraction patterns show that the PNZT95/5 and Mn-doped PNZT95/5 (PNZTM95/5) ceramics, with composition near the boundary of the ferroelectric phase (FE)/antiferroelectric phase (AFE), have a rhombohedral perovskite structure. The ferroelectric behavior of PNZT95/5 ceramics is strongly affected by Mn doping. Without any aging process the PNZTM95/5 ceramics possess double hysteresis loops (P–E loops), whereas the PNZT95/5 ceramics possess normal single hysteresis loops. Due to the defect dipoles formed by effectively negatively charged Mn3+ dopants and positively charged O2- vacancies, the PNZTM95/5 ceramics exhibit the double P–E loops. The defect dipole effect has been proved by investigating the P–E loops under different external fields. As a result, the PNZTM95/5 ceramics become ‘‘hardened”, exhibiting a high mechanical quality factor (1300).

Characterization and expression analysis of BcAMT1;4, an ammonium transporter gene in flowering Chinese cabbage

Lihua Zhong,Xinmin Huang,Yunna Zhu,Erfeng Kou,Houcheng Liu,Guangwen Sun,Riyuan Chen,Shiwei Song 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.4

Ammonium (NH 4+ ) is generated during many endogenous metabolic processes in the leaves of plants, and there is increasing evidence that ammonium transporters (AMTs) play important roles in NH 4 + transmembrane transport and distribution. However, the expression of diff erent AMT genes is tissue-type specifi c and their functions diff er. Information about AMT genes and their expression under diff erent environmental conditions in fl owering Chinese cabbage ( Brassica campestris L.) is currently limited. Here, we isolated and characterized an AMT gene, BcAMT1;4 , in fl owering Chinese cabbage. BcAMT1;4 was localized to the plasma membrane and complemented NH 4+ transport in NH 4+ uptake-defi cient yeast. The highest expression levels of BcAMT1;4 were detected in the fl owers and leaves of fl owering Chinese cabbage. The expression of BcAMT1;4 was induced by nitrogen defi ciency and signifi cantly inhibited by the reapplication of NH 4+ (NH 4 Cl or NH 4 NO 3 ). In contrast, when plants pre-cultured in nitrate were transferred to an NH 4+ nutrient solution, BcAMT1;4 expression was signifi cantly enhanced. BcAMT1;4 exhibited a diurnal expression pattern, with higher expression levels during the light period than during the dark period, and a peak expression at the later stage of the light period. Knowledge of AMT genes in fl owering Chinese cabbage will lay a foundation for enhancing our understanding of the functional roles of diff erent AMT members in the regulation of its growth by NH 4+ , as BcAMT1;4 seems to play an important role in leaf NH 4+ transport.

Prediction of long-term compressive strength of concrete with admixtures using hybrid swarm-based algorithms

Lihua Huang,Wei Jiang,Yuling Wang,Yirong Zhu,Mansour Afzal 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.3

Concrete is a most utilized material in the construction industry that have main components. The strength of concrete can be improved by adding some admixtures. Evaluating the impact of fly ash (FA) and silica fume (SF) on the longterm compressive strength (CS) of concrete provokes to find the significant parameters in predicting the CS, which could be useful in the practical works and would be extensible in the future analysis. In this study, to evaluate the effective parameters in predicting the CS of concrete containing admixtures in the long-term and present a fitted equation, the multivariate adaptive regression splines (MARS) method has been used, which could find a relationship between independent and dependent variables. Next, for optimizing the output equation, biogeography-based optimization (BBO), particle swarm optimization (PSO), and hybrid PSOBBO methods have been utilized to find the most optimal conclusions. It could be concluded that for CS predictions in the long-term, all proposed models have the coefficient of determination (R²) larger than 0.9243. Furthermore, MARS-PSOBBO could be offered as the best model to predict CS between three hybrid algorithms accurately.

Profiling Total Viable Bacteria in a Hemodialysis Water Treatment System

( Lihua Chen ),( Xuan Zhu ),( Menglu Zhang ),( Yuxin Wang ),( Tianyu Lv ),( Shenghua Zhang ),( Xin Yu ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.5

Culture-dependent methods, such as heterotrophic plate counting (HPC), are usually applied to evaluate the bacteriological quality of hemodialysis water. However, these methods cannot detect the uncultured or viable but non-culturable (VBNC) bacteria, both of which may be quantitatively predominant throughout the hemodialysis water treatment system. Therefore, propidium monoazide (PMA)-qPCR associated with HPC was used together to profile the distribution of the total viable bacteria in such a system. Moreover, high-throughput sequencing of 16S rRNA gene amplicons was utilized to analyze the microbial community structure and diversity. The HPC results indicated that the total bacterial counts conformed to the standards, yet the bacteria amounts were abruptly enhanced after carbon filter treatment. Nevertheless, the bacterial counts detected by PMA-qPCR, with the highest levels of 2.14 × 107 copies/100 ml in softener water, were much higher than the corresponding HPC results, which demonstrated the occurrence of numerous uncultured or VBNC bacteria among the entire system before reverse osmosis (RO). In addition, the microbial community structure was very different and the diversity was enhanced after the carbon filter. Although the diversity was minimized after RO treatment, pathogens such as Escherichia could still be detected in the RO effluent. In general, both the amounts of bacteria and the complexity of microbial community in the hemodialysis water treatment system revealed by molecular approaches were much higher than by traditional method. These results suggested the higher health risk potential for hemodialysis patients from the up-to-standard water. The treatment process could also be optimized, based on the results of this study.

Effects of chronic alcohol exposure on ischemia–reperfusion-induced acute kidney injury in mice: the role of β-arrestin 2 and glycogen synthase kinase 3

Lihua Wang,Yifei Zhu,Lili Wang,Jingjing Hou,Yongning Gao,Lei Shen,Jingyu Zhang 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-

Little is known about the effects of chronic alcohol intake on the outcome of acute kidney injury (AKI). Hence, we examined the effects of chronic alcohol intake on the development of renal fibrosis following AKI in an animal model of bilateral renal ischemia–reperfusion (IR) injury. We first found that chronic alcohol exposure exacerbated bilateral IR-induced renal fibrosis and renal function impairment. This phenomenon was associated with increased bilateral IR-induced extracellular matrix deposition and an increased myofibroblast population as well as increased bilateral IR-induced expression of fibrosis-related genes in the kidneys. To explore the mechanisms underlying this phenomenon, we showed that chronic alcohol exposure enhanced β-arrestin 2 (Arrb2) expression and Akt and glycogen synthase kinase-3 (GSK3)β activation in the kidneys. Importantly, pharmacological GSK3 inhibition alleviated bilateral IR-induced renal fibrosis and renal function impairment. Furthermore, we demonstrated that Arrb2− / − mice exhibited resistance to IR-induced renal fibrosis and renal function impairment following chronic alcohol exposure, and these effects were associated with attenuated GSK3β activation in the kidneys. Taken together, our results suggest that chronic alcohol exposure may potentiate AKI via β-arrestin 2/Akt/GSK3β-mediated signaling in the kidney.