Unified SVPWM Strategy for Post-fault Three-level NPC Voltage Source Inverters

Qingli Deng,Xinglai Ge 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Eight switch three-phase inverters (ESTPIs) are the reconfigured topologies of the three-level neutralpoint-clamped (NPC) inverter with a failure leg. This failure leads to different topologies of ESTPIs, which can be controlled by different space vector pulse width modulation (SVPWM) strategies. By analyzing the relationship of three SVPWM strategies for different ESTPIs, a unified coordinate transformation is proposed, which can make one of the three SVPWM strategies be a unified control strategy of ESTPIs. And the unified coordinate transformation is suited for two different SVPWM strategies for ESTPIs. Consequently, the unified strategy not only simplifies the control strategy, but also makes the fault tolerant control strategy more flexible. Simulation and hardware-in-the-loop (HIL) test results have shown the validity and feasibility of the proposed unified SVPWM strategies.

Design and Synthesis of Pyrazolyl Thiosemicarbazones as New Anticonvulsants

Deng, Xian Qing,Song, Ming Xia Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.9

A series of pyrazolyl thiosemicarbazone derivatives were synthesized and evaluated for their anticonvulsant activity using the maximal electroshock (MES) method. Interestingly, all compounds prepared showed long duration of protection effect in the MES screens. Among them, compound 5b was considered as the most promising one with an $ED_{50}$ value of 47.3 mg/kg, and a PI value of 4.8, which was superior to phenobarbital and valproate in the aspect of safety. Furthermore, compound 5b showed protection against seizures induced by pentylenetetrazole suggesting that compound 5b may exert anticonvulsant activity through GABA-mediated mechanisms.

Mesoporous CexZr1−xO2 solid solutions supported CuO nanocatalysts for toluene total oxidation

Qing-Fang Deng,Tie-Zhen Ren,Bao Agula,Yuping Liu,Zhong-Yong Yuan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Mesoporous CexZr1 xO2 solid solutions were prepared by the surfactant-assisted method and used as support of CuO nanocatalysts for catalytic total oxidation of toluene. The prepared CuO/CexZr1 xO2 catalysts have a wormhole-like mesoporous structure with high surface area and uniform pore size distribution, and the CuO nanoparticles were highly dispersed on the surface of CexZr1 xO2. The doping of ZrO2 in CeO2 promotes the dispersion of active copper species and enhances the reducibility of copper species. The effect of Ce/Zr ratio, calcination temperature and CuO loading amount on the catalytic performance of CuO/CexZr1 xO2 was investigated in detail. The 400 ℃-calcined 8%CuO/Ce0.8Zr0.2O2 catalyst exhibits the highest activity with the complete toluene conversion temperature of 275 ℃ at the condition of GHSH = 33,000 h-1 and the toluene concentration of 4400 ppm. The interfacial interaction between CuO and the CexZr1 xO2 support, highly dispersed CuO nanoparticles and the nature of the support contribute to the high catalytic activity of mesoporous CuO/CexZr1 xO2 nanocatalysts.

Investigation on the Preparation and Adsorption Performance of Bamboo Fiber Based Activated Carbon

Qing Zhang,Yue Zeng,Xiuyun Xiao,Penghu Deng,Qing He,Tonghua Zhang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2

In this work, an approach was explored to make natural fiber based activated carbon with high adsorption capacity for treating dyeing wastewater. Bamboo fiber based activated carbon (BFAC) was prepared by bamboo fiber extracted from bamboo strips by extracting technique. An orthogonal experiment was carried out to obtain optimum preparation condition for the best dye adsorption. The microstructures of BFAC were characterized by scanning electron microscopy, N2 adsorption-desorption analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. Adsorption mechanism of BFAC to methylene blue (MB) was studied and the adsorption isotherm followed the Langmuir model, with maximum monolayer adsorption capacity of 651.7 mg g-1. The adsorption kinetic was better described by the pseudo-second-order model. Microstructure characterization showed lots of opened pores and cracks with different size on BFAC, with Brunauer-Emmett-Teller (BET) surface area of 1370 m2 g-1 and total pore volume of 0.9411 cm3 g-1. The analysis indicated that cellulose crystal of bamboo fiber was severely destroyed in the preparation process, which could contribute to the formation of pores. Moreover, -OH and -C=O functional groups on BFAC are beneficial for adsorbing MB in aqueous solution. As a result, adopting bamboo fiber may help form BFAC with high BET surface area, which proved to be an effective idea to prepare activated carbon with high adsorption performance.

Transcriptional response of Methoprene-tolerant (Met) gene to three insect growth disruptors in Leptinotarsa decemlineata (Say)

Qing-Wei Meng,Qing-Yu Xu,Pan Deng,Kai-Yun Fu,Wen-Chao Guo,Guo-Qing Li 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2

Some insect growth disruptors (IGDs), such as pyriproxyfen and halofenozide, may be used to control Leptinotarsa decemlineata. However, their mechanism of action remains elusive. Methoprene-tolerant (Met) mediates juvenile hormone (JH) signal to control numerous essential physiological processes. In the present paper, we identified a Met gene (LdMet). LdMet protein was a typical basic helix-loop-helix/Per-Arnt-Sim (bHLHPAS) transcription factor with a bHLH domain, two PAS domains (PAS-A and PAS-B) and a region called PAS associated C terminal (PAC). Eight conserved amino acids critical for JH binding were located in PAS-B and PAC domains. The temporal expression pattern of LdMet was in accordance with the variation of circulating JH titers. Feeding of juvenoid methoprene or pyriproxyfen, or provide for JH dose-dependently stimulated the expression of LdMet. RNA interference-mediated knockdown of two JH degradation genes increased the transcription of LdMet, while silencing of a JH biosynthesis gene repressed the transcription. Conversely, ingestion of an ecdysteroid agonist halofenozide or 20-hydroxyecdysone (20E) reduced the mRNA levels of LdMet, in a dosedependent manner, whereas knockdown of either ecdysteroidogenesis or 20E signaling genes increased the mRNA accumulation. Providing that the expression of LdMet can be disturbed by methoprene, pyriproxyfen and halofenozide, LdMet may be a potential target of these IGDs in L. decemlineata larvae.

Analysis of thermally induced vibration of cable-beam structures

Deng, Han-Qing,Li, Tuan-Jie,Xue, Bi-Jie,Wang, Zuo-Wei Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.3

Cable-beam structures characterized by variable stiffness nonlinearities are widely found in various structural engineering applications, for example in space deployable structures. Space deployable structures in orbit experience both high temperature caused by sun's radiation and low temperature by Earth's umbral shadow. The space temperature difference is above 300K at the moment of exiting or entering Earth's umbral shadow, which results in structural thermally induced vibration. To understand the thermally induced oscillations, the analytical expression of Boley parameter of cable-beam structures is firstly deduced. Then, the thermally induced vibration of cable-beam structures is analyzed using finite element method to verify the effectiveness of Boley parameter. Finally, by analyzing the obtained numerical results and the corresponding Boley parameters, it can be concluded that the derived expression of Boley parameter is valid to evaluate the occurrence conditions of thermally induced vibration of cable-beam structures and the key parameters influencing structural thermal flutter are the cable stiffness and thickness of beams.

Synthesis and Studies on Anticonvulsant and Antidepressant Activities of 5-Alkoxy-tetrazolo[1,5-a]quinolines

Deng, Xian-Qing,Wei, Cheng-Xi,Song, Ming-Xia,Chai, Kyu-Yun,Sun, Zhi-Gang,Quan, Zhe-Shan Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.2

A series of 5-alkoxy-tetrazolo[1,5-a]quinolines were synthesized to evaluate their anticonvulsant and antidepressant effects. Anticonvulsant effects and neurotoxicity of the compounds when injected intraperitoneally to mice were determined by a maximal electroshock (MES) test and a rotarod test, respectively. Only three of the synthesized compounds (4a, 4b, 4c) displayed anticonvulsant activity at a dose of 300 mg/kg. Most of the compounds significantly reduced immobility times during the forced swimming test (FST) at a dose of 100 mg/kg, indicative of antidepressant activity. Among the compounds, 5-(2-fluorobenzyloxy)tetrazolo[1,5-a]quinoline (4k) reduced immobility time by 66.85% at 30 mg/kg compared with the same dose of Fluoxetine, which reduced immobility time by 52.30%. According to the results of the 5-Hydroxytryptophan induced head-twitch test and yohimbine toxicity potentiation test, the noradrenergic system seems not to be involved in the antidepressant-like effect of compound 4k while the serotonergic system seems a little to be involved.

Design and Synthesis of Pyrazolyl Thiosemicarbazones as New Anticonvulsants

Xian Qing Deng,Ming-Xia Song 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.9

A series of pyrazolyl thiosemicarbazone derivatives were synthesized and evaluated for their anticonvulsant activity using the maximal electroshock (MES) method. Interestingly, all compounds prepared showed long duration of protection effect in the MES screens. Among them, compound 5b was considered as the most promising one with an ED50 value of 47.3 mg/kg, and a PI value of 4.8, which was superior to phenobarbital and valproate in the aspect of safety. Furthermore, compound 5b showed protection against seizures induced by pentylenetetrazole suggesting that compound 5b may exert anticonvulsant activity through GABAmediated mechanisms.

Synthesis and Studies on Anticonvulsant and Antidepressant Activities of 5-Alkoxy-tetrazolo[1,5-a]quinolines

Xian-Qing Deng,Cheng-Xi Wei,Ming-Xia Song,채규윤,Zhi-Gang Sun,Zhe-Shan Quan 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.2

A series of 5-alkoxy-tetrazolo[1,5-a]quinolines were synthesized to evaluate their anticonvulsant and antidepressant effects. Anticonvulsant effects and neurotoxicity of the compounds when injected intraperitoneally to mice were determined by a maximal electroshock (MES) test and a rotarod test, respectively. Only three of the synthesized compounds (4a, 4b, 4c) displayed anticonvulsant activity at a dose of 300 mg/kg. Most of the compounds significantly reduced immobility times during the forced swimming test (FST) at a dose of 100 mg/kg, indicative of antidepressant activity. Among the compounds, 5-(2-fluorobenzyloxy)tetrazolo[1,5-a]quinoline (4k) reduced immobility time by 66.85% at 30 mg/kg compared with the same dose of Fluoxetine, which reduced immobility time by 52.30%. According to the results of the 5-Hydroxytryptophan induced head-twitch test and yohimbine toxicity potentiation test, the noradrenergic system seems not to be involved in the antidepressant-like effect of compound 4k while the serotonergic system seems a little to be involved.

황간(黃幹) 사상에 대한 퇴계의 이해와 수용

등경평 ( Deng Qing-ping ),전병옥(번역) 퇴계학연구원 2017 退溪學報 Vol.141 No.-

退溪 李滉은 勉齋 黃?의 사상을 가장 중시했던 조선의 성리학자이다. 면재의 사상에 대한 그의 이해와 수용은 주로 『性理大全』에 수록된 면재의 자료를 중심으로 이루어졌는데 중요하게는 다음의 세 가지이다. 첫째, 四端七情 논변에서 면재 사상의 영향을 받아 理氣互發의 관점을 형성한 것이고, 둘째, 無極과 太極의 “極” 자에 대한 면재의 이해가 퇴계 사상을 한 차례 변화시킨 것이고, 셋째, 면재의 음양과 오행의 차례에 대한 학설을 둘러싸고 퇴계가 깊은 논의를 한 것이다. 면재 사상에 대한 퇴계의 이해와 수용을 살펴봄으로써 면재 사상이 한국 성리학 발전에 얼마나 중대한 영향을 미쳤는지 확인할 수 있을 것이다. Yi Hwang(Toegye) is the most important Korean Confucian scholars who has pay attention to Huang Gan(黃?)`s thought. His unique understanding and acceptance on Huang Gan`s thought is largely dependent on Huang Gan`s datas in the “Xinglidaquan(性理大全)”. There are three main aspects. First, because of the influence of Mian Zhai thought, Toegye formed the view of "Liqihufa(理氣互發)" in the discussion on the” Siduan Qiqing(四端七情)”. Second, Because of Huang Gan`s understanding on “Taiji(太極)”, Toegye`s thought has dundergone a change. Third, with regard to Huang Gan`s though on the order of Yin-Yang and five elements(陰陽五行), Toegye has deep discussion. From these unique understanding and acceptance on Huang Gan`s thought, we can see that, on the one hand, Toegye has extensive reading and critical understanding on Huang Gan thought; on the other hand, Huang Gan`s thought has an important influence on the development of Korean Confucian.