Dynamic response for electromechanical integrated toroidal drive to electric excitation

Xu, Lizhong,Hao, Xiuhong Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.6

In this paper, the equivalent exciting force caused by electric excitation is derived. By dividing load and displacement vectors into mean values and time-varying ones, the dynamic equations of the system are transformed into linear ones for time-varying portion of the displacements. The analytical equations of the forced time responses of the drive system to electric excitations are obtained. Using the Laplace transformation, the transfer function of the drive system is obtained. These equations are used to analyze the time and frequency responses of the drive system to the electric excitation. It is known that electric excitation can cause forced responses of the drive system, the total dynamic responses are decided by three phase exciting voltages, exciting frequency and natural frequencies of the drive system, and the drive parameters have obvious influence on the time and frequency responses.

Electrochemical synthesis and properties of multicolor electrochromic triphenylamine-based polymer films

Xiuhong Chen,Panxu Tang,Hong Yu,Wenfeng Xu,Xiaojia Zhao 한국고분자학회 2024 Macromolecular Research Vol.32 No.6

Four novel triphenylamine-based (TPA-based) conjugate polymer films (one homopolymer and three co-polymers) were electrochemically synthesized from N4,N4′-bis(4-((6-(1H-indol-1-yl)hexyl)oxy)phenyl)-N4,N4′-diphenyl-[1,1′-biphenyl]- 4,4′-diamine (TPY) and 3,4-ethylenedioxythiophene (EDOT) as monomers. The polymer structure was tuned by adjusting the monomer proportions. The homopolymer contains electrochromic TPA and indole groups in its backbone, while an additional electrochromic EDOT groups are present in the co-polymers. The electrochemical, optical, and electrochromic properties of the polymers were characterized along with film morphologies. Each polymer is multicolored, with electrochromic performance that depends heavily on its structure. The introduction of EDOT into the backbone significantly improved polymer-film-forming properties. In addition, the co-polymers exhibited excellent spectroelectrochemical performance and are visible–near-infrared electrochromic materials. In particular, the spectrum of oxidized PTPY–EDOT-2 covers the entire visible region, while oxidized PTPY–EDOT-3, which contains the highest amount of EDOT, strongly absorbs in the nearinfrared region (> 800 nm) while absorbing fully across the visible region. Consequently, PTPY–EDOT-3 is a potential candidate for display and camouflage applications owing to its excellent properties. Double-layer electrochromic devices (ECDs) were fabricated using polymer films and WO3 as active layers. The homo- and co-polymers exhibit particularly different electrochromic performance. The PTPY ECD performs best. It exhibited a maximum contrast of 36.7% at 720 nm in the absence of EDOT, with a coloration efficiency of 418 cm2/ C recorded; moreover, it exhibited an obvious memory effect, with a memory time of 20 min recorded at 480 nm. Consequently, these polymers are potentially useful for optoelectronics applications.

Dynamics of electric system for electromechanical integrated toroidal drive under mechanical disturbance

Hao, Xiuhong,Xu, Lizhong Techno-Press 2009 Interaction and multiscale mechanics Vol.2 No.2

Dynamics of the electric system for the toroidal drive under mechanical disturbance is presented. Using the method of perturbation, free vibrations of the electric system under mechanical disturbance are studied. The forced responses of the electric system to voltage excitation under mechanical disturbance are also presented. We show that as the time grows, the resonance vibration caused by voltage excitation still exists and the vibrations caused by mechanical disturbance are enlarged. The coupled resonance vibration caused by mechanical disturbance and voltage excitation is discussed. The conditions of the occurrence of coupled resonance are studied.

Establishment of hybridization breeding of Ganoderma lucidum by protoplast monokaryogenesis method

Wu Jiaojiao,Fu Lizhong,Wu Xueqian,Xu Xiuhong,Li Haibo,Cheng Junwen,Wu Qingqi,Wei Hailong 한국버섯학회 2010 한국버섯학회 국제학술대회 Vol.6 No.-

Anaerobic Ammonium-Oxidizing Bacteria in Cow Manure Composting

( Tingting Wang ),( Lijun Cheng ),( Wenhao Zhang ),( Xiuhong Xu ),( Qingxin Meng ),( Xuewei Sun ),( Huajing Liu ),( Hongtao Li ),( Yu Sun ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.7

Composting is widely used to transform waste into valuable agricultural organic fertilizer. Anaerobic ammonium-oxidizing (anammox) bacteria play an important role in the global nitrogen cycle, but their role in composting remains poorly understood. In the present study, the community structure, diversity, and abundance of anammox bacteria were analyzed using cloning and sequencing methods by targeting the 16S rRNA gene and the hydrazine oxidase gene (hzo) in samples isolated from compost produced from cow manure and rice straw. A total of 25 operational taxonomic units were classified based on 16S rRNA gene clone libraries, and 14 operational taxonomic units were classified based on hzo gene clone libraries. The phylogenetic tree analysis of the 16S rRNA gene and deduced HZO protein sequences from the corresponding encoding genes indicated that the majority of the obtained clones were related to the known anammox bacteria Candidatus “Brocadia,” Candidatus “Kuenenia,” and Candidatus “Scalindua.” The abundances of anammox bacteria were determined by quantitative PCR, and between 2.13 × 10⁵ and 1.15 × 10⁶ 16S rRNA gene copies per gram of compost were found. This study provides the first demonstration of the existence of anammox bacteria with limited diversity in cow manure composting.

Establishment of hybridization breeding of Ganoderma lucidum by protoplast monokaryogenesis method

Wu Jiaojiao,Fu Lizhong,Wu Xueqian,Xu Xiuhong,Li Haibo,Wu Qingqi,Wei Hailong,Cheng Junwen 한국버섯학회 2010 한국버섯학회지 Vol.8 No.4

Four Ganoderma lucidum strains, Chizhi 05, Jingda, Huizhou and Xinzhou, were screened out as hybrid parent in order to establish G. lucidum cross breeding system that based on protoplast monokaryogenesis method. Monokaryotic strains of each parental strains were obtained and mating type of each monokaryotic strains were determined. One to three monokaryotic strains that have different mating types were mated, and hybrids were identified by clamp connection observation and antagonist response. The results showed that the number of monokaryon came from Chizhi 05, Jingda, Huizhou and Xinzhou was 9, 14, 40 and 38, respectively. Only one mating type was obtained from Jingda, and two mating types were obtained from the other three strains, Chizhi 05, Huizhou and Xinzhou, respectively. Chi-square test showed that the ratio of two mating types of the three strains was 1:1. Fourteen monokaryotic strains of different mating types from 4 parental strains were select as a cross- breeding materia, and 17 hybrids were obtained, which were identified by clamp connection observation and antagonist response. This study proclaimed that the practicality of the hybridization breeding of G. lucidum by protoplast monokaryogenesis method.

Biosorption of Lead(II) by Arthrobacter sp. 25: Process Optimization and Mechanism

( Yu Jin ),( Xin Wang ),( Tingting Zang ),( Yang Hu ),( Xiaojing Hu ),( Guangming Ren ),( Xiuhong Xu ),( Juanjuan Qu ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.8

In the present work, Arthrobacter sp. 25, a lead-tolerant bacterium, was assayed to remove lead(II) from aqueous solution. The biosorption process was optimized by response surface methodology (RSM) based on the Box-Behnken design. The relationships between dependent and independent variables were quantitatively determined by second-order polynomial equation and 3D response surface plots. The biosorption mechanism was explored by characterization of the biosorbent before and after biosorption using atomic force microscopy (AFM), scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the maximum adsorption capacity of 9.6 mg/g was obtained at the initial lead ion concentration of 108.79 mg/l, pH value of 5.75, and biosorbent dosage of 9.9 g/l (fresh weight), which was close to the theoretically expected value of 9.88 mg/g. Arthrobacter sp. 25 is an ellipsoidalshaped bacterium covered with extracellular polymeric substances. The biosorption mechanism involved physical adsorption and microprecipitation as well as ion exchange, and functional groups such as phosphoryl, hydroxyl, amino, amide, carbonyl, and phosphate groups played vital roles in adsorption. The results indicate that Arthrobacter sp. 25 may be potentially used as a biosorbent for low-concentration lead(II) removal from wastewater.