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Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells
Zhou, X.,Qu, Y.,Kim, B.H.,Choo, P.Y.,Liu, J.,Du, Y.,He, W.,Chang, I.S.,Ren, N.,Feng, Y. Elsevier Applied Science 2014 Bioresource technology Vol.169 No.-
The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteobacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.
Wang J.J.,Deng Q.J.,He Y.Y.,Feng Y.N.,Kang M.P.,Duan X.L.,Yang Y.L. 한국물리학회 2022 Current Applied Physics Vol.39 No.-
CCTO (Calcium copper titanate) powder as inorganic filler was synthesized by the Sol-gel method firstly. CCTO/ PVDF (Polyvinylidene fluoride) composite was fabricated by solution mixing based on high temperature resistance of PVDF and insulated property of CCTO. The composite of CCTO/PVDF were characterized by X-ray diffraction, Fourier Transform infrared spectroscopy, Scanning Electron Microscope and impedance analysis. The results showed that the addition of CCTO and increasing in its content did not affect the phase- and microstructure of the composites,but the increase of CCTO content can induce the generation of C–F new bonds. PVDF/CCTO composites were enhanced in performance of thermal and frequency-depended stability with increasing in the fraction of CCTO. The dielectric constant of CCTO/PVDF composite materials with 50% CCTO achieved to a maximum value of 50 almost, which is 5 times higher the pure PVDF. The conductivity felled into 10-8 to 10-1 S m-1 during the frequency of 102–108 Hz. The composite material would be expected to be applied in the field of integrated circuit.
Development of the 3.7 GHz LHCD System on HL-2A
B. Lu,M. Huang,H. Zeng,X. Y. Bai,X. H. Mao,Z. H. Lu,J. Liang,Z. H. Kang,M. W. Wang,K. Feng,H. Wang,C. Wang,J. Q. Wang,S. Wei,T. Yao,Y. N. Bu,J. Feng,G. Y. Cheng,S. D. Song,D. H. Xia,J. Rao 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A 2 MW-3.7 GHz lower hybrid current drive (LHCD) system is under development for physicsexperiments on the HL-2A device. The RF Power is generated by four TH2103A klystron amplifiersand propagates in the TE10 mode through WR284 waveguides. The transmission lines with a lengthof 20 m to 30 m are pressurized with 2 bars of nitrogen to decrease the possibility of arcing. Thelauncher, based on the passive-active multi-junction (PAM) concept, has been developed and iscurrently being realized. It was designed for a power spectrum peaked at Nk = 2.75 with goodcoupling properties over a wide range of plasma parameters. The four klystrons are fed by ahigh-voltage power supply (HVPS) based on the pulse step modulation (PSM) concept with a fastswitch-off time of less than ten μs. This system is expected to be in operation within 1 years and willexplore many international thermonuclear experimental reactor (ITER) related LH experiments inthe following years.
Morphology Changes of E. coli in Ag-HAp Observed by TEM
Kim, T.N.,Feng, Q.L.,Kim, Y.J.,Yim, H.J.,Lim, D.Y.,Hwang, D.S.,Kim, J.W.,Cui, F.Z. The Korean Vacuum Society 1998 Applied Science and Convergence Technology Vol.7 No.1
The antimicrobial effects of HAp and Ag-HAp was observed using periprosthetic infection bacteria such as Pseudomonas Aeruginosa, Staphylococcus Epidermidis, Escherichia coli (DH5$\alpha$). Ag-HAp showed good antimicrobial effects. TEM study of E. coli with and without Ag treatment in HAp was experimented in order to find the mechanism of Ag in antimicrobial effects. It was observed that the shape of Ag-treated E. coli was changed, the cells walls became inhomogeneous. The vaculoes at cytoplasm formed into E. coli and finally it was discovered by EDAX that there were many dark granules which contain the Ag element inside the cells.
J.J. Wang,G.Z. Li,L.J. Feng,X.L. Chao,K. Zhao,Y.N. Feng 한국물리학회 2017 Current Applied Physics Vol.17 No.2
To clarify the influence of nano-graphite (NG) on the comprehensive performances of Nano-graphite/ PZT-PMN-PNN/RTV composites, composites with damping-absorption performances and storage-loss behaviors based on Room Temperature Vulcanizing silicone rubber (RTV), PZT matrix ceramics, NG as conductive agent were fabricated employing three steps methods of ball-milling, three-roller milling and pressing. The effects of NG on storage, loss and damping properties were investigated by the method of DMTA. Absorption and mechanical performances are measured by the method of standing wave tube and TG. The morphologies, chemical and phase structures of composites are characterized by SEM, XRD and IR. The research indicated that both doping of NG and the combination of PZT-PMN-PNN/RTV can be proposed to improve greatly the comprehensive performance of RTV matrixes. There would be more excellent comprehensive properties in NG/PZT-PMN-PNN/RTV composites as increasing rate of 65% in d33, storage modulus of 3010 MPa, loss modulus of 205 MPa, and damping coefficient tand of 0.26 and, absorption coefficients of 0.6e0.7 with the frequency of 400e1600 Hz. Also, the improvement in NG amounts for composites can lead to the enforcement of stress for NG/ZT-PMN-PNN/RTV composites, but it caused neither the preferential growth in any a single crystal surface, nor the appearance of solid solution.