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Feng-Jun Zhang,Ming-Liang Chen,오원춘 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.4
We investigate a method for the electrochemical preparation of titanium dioxide/carbon nanotube (TiO₂/CNT) composites involving the electroplating of Ti in a titanium n-butoxide (TNB) electrolyte into a CNT matrix. The BET surface areas of TiO₂/CNT composites decreased as electrochemical operating time increased. Changes in XRD patterns showed a typical anatase type on the TiO₂/CNT composite prepared with a CNT matrix by the electroplating method in the TNB solution. In SEM micrographs, the titanium complex particles were uniformly distributed on the CNT surface. The results of chemical elemental analysis for the TiO₂/CNT composites showed that most of the spectra for these samples produced stronger peaks for carbon and Ti metal than those of any other element. Finally, the prominent photoelectrocatalytic (PEC) activities of the TiO₂/CNT composites could be attributed to the combined effects of photodegradation of TiO₂, electron assistance of CNT and the application of a sufficient voltage.
Feng-Jun Zhang,Ming-Liang Chen,임창성,오원춘 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5
In this study, three kinds of CNT/TiO2 electrodes were prepared. The electrodes prepared were characterized by BET surface area, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and it illuminated that the electrodes developed consisted of well mixed anatase and rutile TiO2 particles with the CNTs and they exhibited a higher catalytic activity. The catalytic efficiency of the electrodes developed was evaluated by the photoelectrodegradation of methylene blue (MB). The photoelectrodegradation of MB using the proposed electrode under different experimental conditions was investigated. The positive potential applied in photoelectrocatalytic (PEC) oxidation was also studied. It was found that catalytic decomposition of the MB solution could be attributed to the combination effects between TiO2 photocatalyst and the electro-assistance of the CNTs, with the conductive of CNT network facilitating the electron transfer between the adsorbed MB molecules and the catalyst substrate, and that PEC oxidation increased with an increase of the CNT composition.
A novel M2e-multiple antigenic peptide providing heterologous protection in mice
Feng Wen,Ji-Hong Ma,Hai Yu,Fu-Ru Yang,Meng Huang,Yan-Jun Zhou,Ze-Jun Li,Xiu-Hui Wang,Guo-Xin Li,Yi-Feng Jiang,Wu Tong,Guangzhi Tong 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.1
Swine influenza viruses (SwIVs) cause considerable morbidity and mortality in domestic pigs, resulting in a significant economic burden. Moreover, pigs have been considered to be a possible mixing vessel in which novel strains loom. Here, we developed and evaluated a novel M2e-multiple antigenic peptide (M2e-MAP) as a supplemental antigen for inactivated H3N2 vaccine to provide cross-protection against two main subtypes of SwIVs, H1N1 and H3N2. The novel tetra-branched MAP was constructed by fusing four copies of M2e to one copy of foreign T helper cell epitopes. A high-yield reassortant H3N2 virus was generated by plasmid based reverse genetics. The efficacy of the novel H3N2 inactivated vaccines with or without M2e-MAP supplementation was evaluated in a mouse model. M2e-MAP conjugated vaccine induced strong antibody responses in mice. Complete protection against the heterologous swine H1N1 virus was observed in mice vaccinated with M2e-MAP combined vaccine. Moreover, this novel peptide confers protection against lethal challenge of A/Puerto Rico/8/34 (H1N1). Taken together, our results suggest the combined immunization of reassortant inactivated H3N2 vaccine and the novel M2e-MAP provided cross-protection against swine and human viruses and may serve as a promising approach for influenza vaccine development.
Finite-Time Functional Observers for Descriptor Systems
Jun-e Feng,James Lam,Shengyuan Xu 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.3
This paper deals with the problem of finite-time functional observer design for linear descriptor systems, which converges in finite time exactly. The observer comprises two infinite-time functional observers and a finite delay element. The technique in designing such a class of observers for state-space systems can not be directly applied to deal with the present problem due to the algebraic structure of descriptor systems. A sufficient condition to guarantee the existence of such an observer is obtained in terms of certain rank conditions. Moreover, special cases for state and reduced-order ob-servers are also analyzed. Numerical simulation is used to illustrate the developed method.
Jun-Feng He,Jie Yan,Jiang-Shan Li,Jian-Hua Liu,Chao Wang,Xiao-Rong Chang,Ya-Ting Qu 사단법인약침학회 2013 Journal of Acupuncture & Meridian Studies Vol.6 No.2
The nucleus of the solitary tract (nucleus tractus solitarii; NTS) is a primary center for both visceral afferents and somatic afferents. Previous experiments have demonstrated that the NTS is closely connected to the stomach and acupoints in the Yangming Stomach Meridian of Foot (ST Meridian). In this study, extracellular recording and immunochemistry methods were used to analyze the discharge of neurons and c-Fos protein expression in the NTS following acupuncture at different acupoints and a nonacupoint. A total of 104 discharging neurons were detected in the NTS of 52 rats, of which 86 provided complete data. After acupuncture at Sibai (ST 2), Zusanli (ST 36), Neiting (ST 44), Quanliao (SI 18), and the nonacupoint, the neuron response rate in the NTS was 65.12%, 51.16%, 46.51%, 34.88% and 31.40% respectively. For neuron response rate, there was a significant difference among Sibai (ST 2), Zusanli (ST 36), Neiting (ST 44), Quanliao (SI 18), and the nonacupoint (p < 0.01 or p < 0.05). In the other 48 rats, the number of c-Fos immunoreactive neurons in the NTS by electroacupuncture (EA) at Sibai (ST 2) group was significantly higher than that EA at other acupoints and the nonacupoint (p < 0.05 or p < 0.01). EA at both Zusanli (ST 36) and Neiting (ST 44) increased c-Fos immunoreactive neurons significantly over EA at Quanliao (SI 18) and the nonacupoint (p < 0.05 or p < 0.01), while there was no difference between EA at Quanliao (SI 18) and the nonacupoint group (p > 0.05). The experiments demonstrated that the afferent convergence in NTS are different by body surface points stimulus, which suggests that the NTS might be a primary center in the central nervous system receiving acupoints stimulus from the ST Meridian.
Feng-Jun Zhang,Ming-Liang Chen,오원춘 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
In this study, we have studied on improved performance of carbon nanotubes/titanium (CNT/TiO2) structure electrode for methylene blue (MB). The composite electrodes consisting of CNTs and a titanium oxide matrix with phenol resin binder was fabricated with a mixture method. The chemical and morphological structure of CNT/TiO2 composites were characterized by means of BET surface area, X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis absorption technique, Raman spectroscopy and energy dispersive X-ray (EDX). The electrode showed a remarkably enhanced performance for MB oxidation under UV illumination with or without electro-chemical reaction (ECR). Such a remarkably improved performance of the CNT/TiO2 structure electrode might be due to the enhanced MB oxidation by electro- and photo-generated electrons and holes in the CNTs and TiO2 under UV illumination with or without ECR.
Feng-Jun Zhang,Zhuo Zhang,Han Xuan,Hong-Chen Xia,Lei Zhu,오원춘,Fazhi Xie 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
Magnetic-graphene nanosheets have been synthesized via a simple effective chemical precipitation method followed by heattreatment. The composite nanosheets are super paramagnetic at room temperature and can be separated by an external magneticfield. The prepared magnetic-graphene nanosheets were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), Raman spectroscopy, and BET surface area analysis. The resultsdemonstrated the successful attachment of iron oxide nanoparticles to graphene nanosheets. It was found that the attachednanoparticles were mainly Fe3O4. The magnetic-graphene nanosheets showed near complete methyl orange removal within 10mintues and would be practically usable for methyl orange separation from water.
On Dimensions of Linear Discrete Dimension-unbounded Systems
Jun-e Feng,Biao Wang,Yongyuan Yu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
This letter investigates the variance of state dimensions of linear discrete dimension-unbounded systems,which are a class of cross-dimensional systems. First, the dimensional relationship of states, initial values andsystem matrices of some special cases is discussed. Then, for the general case, to directly calculate the transitiontime and state dimensions after the transition time, an algorithm is established on the basis of the iterative time,dimensions of initial values and system matrices. Finally, there is an illustrative example to show the effectivenessof these obtained results
Photoelectrocatalytic Degradation of Dyes in Aqueous Solution Using CNT/TiO₂ Electrode
Feng-Jun Zhang,Jin Liu,Ming-Liang Chen,Won-Chun Oh 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
The effect of photoelectrocatalytic (PEC) degradation for different dyes with the CNT/TiO₂ electrode was studied. The prepared electrode was characterized with surface properties, structural crystallinity, elemental identification, and PEC activity. The N2 adsorption data showed that the composites had decreased surface area compared with the pristine CNT. This indicated the blocking of micropores on the surface of CNT, which was further supported by observation via FESEM. XRD patterns of the composites showed that the CNT/TiO₂ composite contained a mixing anatase and rutile phase. EDX spectra showed the presence of C, O and Ti peaks for all samples. The decomposition efifciency of the prepared electrode was evaluated by the PEC degradation of three dyes (methylene blue (MB), rhodamine B (RH.B), methyl orange (MO)). The variations of the FT-IR spectra and pH value of dye solutions were measured during the PEC system; it was found that the CNT/ TiO₂ electrode has better PEC degradation for MB solution than that of RH.B and MO. The proposed degradation mechanism was present.