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Plasma-sprayed gadolinium-doped ceria (GDC) for intermediate temperature solid electrolyte
Chanjin Son,Aman Bhardwaj,Jaewoon Hong,Jin-Wook Kim,Heung-Soo Moon,Hyo-Seop Noh,Sun-Ju Song 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.12
10 mol% gadolinium-doped cerium (IV) oxide was prepared by solid-state reaction route and deposited as a thick film usingthermal (plasma) spray technique. The phase development, microstructure and topography were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The mechanical strength of thedeposited film was determined by pull-off adhesion test. The plasma-sprayed GDC was characterized for its electricalproperties by dc four-probe conductivity experiments. The maximum conductivity for plasma-sprayed GDC was found to be3.60 × 10−2 Scm−1, which was lesser than 2.25 × 10−1 Scm−1for the CIP-sintered GDC at 1000 oC and pO2= 0.21 atm. Thedecrease in the conductivity is attributed to the larger intergranular spaces and uneven networking observed in themicrostructure resulted in higher activation energy and low conductivity.
SON, Kidong,KIM, Yong Kwan,WOO, Chanjin,WANG, Seung-Jun,KIM, Youngsik,OEM, Jae-Ku,JHEONG, Weonhwa,JEONG, Jipseol The Japanese Society of Veterinary Science 2018 The Journal of veterinary medical science Vol.80 No.3
<P>An outbreak of botulism occurred over a two-month period beginning July 20, 2016. In all, 697 wild birds were found paralyzed or dead at the Namdong reservoir and 11 Gong-gu. Using a mouse bioassay, type C botulinum toxin was identified in the bird serum, liquid cultures of soil samples, and maggot extracts. To minimize further infection of wild birds, we opened the floodgates of the Namdong reservoir adjacent to the Yellow Sea; this decreased the water temperature and the nutrient load such as nitrogen and phosphorus. The outbreak stopped shortly after taking these actions. It is not known if these efforts decreased the number of dead and diseased wild birds. Our study demonstrates one potential approach to minimize future botulism outbreaks among wild birds and their habitats.</P>
Woo, Chanjin,Kwon, Jung-Hoon,Lee, Dong-Hun,Kim, Youngsik,Lee, Kwanghee,Jo, Seong-Deok,Son, Ki dong,Oem, Jae-Ku,Wang, Seung-Jun,Kim, Yongkwan,Shin, Jeonghwa,Song, Chang-Seon,Jheong, Weonhwa,Jeong, Jips Springer Vienna 2017 Archives of virology Vol.162 No.12
<P>We report the identification of a novel reassortant clade 2.3.4.4 H5N8 virus from a dead grey heron in Korea in 2017. Outbreaks of clade 2.3.4.4 H5 HPAIVs have been reported worldwide, and they have evolved into multiple genotypes among wild birds. Phylogenetic analysis indicated that this virus likely originated from Qinghai Lake and Western Siberia and further evolved through reassortment with Eurasian LPAI during the 2016 fall migration of wild birds. Enhanced surveillance and comparative genetic analysis will help to monitor the further evolution and dissemination of clade 2.3.4.4 HPAIVs.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00705-017-3547-2) contains supplementary material, which is available to authorized users.</P>
Balamurugan, C.,Son, Chanjin,Hong, Jaewoon,Song, Sun-Ju Elsevier 2018 Sensors and actuators. B Chemical Vol.262 No.-
<P><B>Abstract</B></P> <P>We have designed the solid-state electrochemical mixed potential type NiO and yttrium-stabilized zirconia (YSZ) composite based sensing electrode for selective detection of NO<SUB>x</SUB> at elevated temperatures. The planner NiO-YSZ composite sensing electrode could detect NO<SUB>x</SUB> even at 400 °C, with acceptable response/recovery rates. The change in emf values of the sensor varied linearly with NO<SUB>x</SUB> concentrations on a logarithmic scale in the range of 5–100 ppm. The response characteristic of the sensor was improved by modifying the surface with different vol% of pore former. As a result, obtained porous electrodes showed better response characteristics concerning speed and response owing to higher porosity. To improve response kinetics of porous NiO-YSZ electrode, NiO nanoparticles are infiltrated into an optimized NiO-YSZ sensing electrode surface by controlled urea/cation infiltration method. The experimental results demonstrated that NiO nanoparticles infiltrated NiO-YSZ sensor electrode reveal remarkably high emf response to NO<SUB>x</SUB> compared that of planar electrode, suggesting that NiO nanoparticles introduction can significantly enhance catalytic activity and electrochemical performance of NiO-YSZ electrode. Finally, the porosity effect of electrode subtracts (YSZ) with NO<SUB>x</SUB> gases response and recovery kinetics was examined under the optimum operating temperature at 400 °C. The sensing mechanism based on the mixed potential for the surface modified NiO-YSZ composite sensing electrode was discussed based on the obtained result of sensing characterizations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The detailed NO<SUB>x</SUB> gas sensing characteristics of NiO-YSZ based three different types of mixed potential sensing electrodes for the comparatively low operating temperature of 400 °C. </LI> <LI> Optimized NiO-YSZ electrode surface was modified by the addition of different vol% of pore former, it showed better response characteristics concerning speed and response. </LI> <LI> The NiO nanoparticles infiltrated NiO-YSZ sensing electrode shows a remarkably high emf variation to 100 ppm NO<SUB>x</SUB>, and it can detect a level as low as 3 ppm. </LI> <LI> The porosity effect of electrode subtracts (YSZ) with NO<SUB>x</SUB> gases response and recovery kinetics was also examined under the optimum operating temperature at 400 °C. </LI> </UL> </P>
Molecular prevalence and genotyping of <i>Chlamydia</i> spp. in wild birds from South Korea
JEONG, Jipseol,AN, Injung,OEM, Jae-Ku,WANG, Seung-Jun,KIM, Yongkwan,SHIN, Jeong-Hwa,WOO, Chanjin,KIM, Youngsik,JO, Seong-Deok,SON, Kidong,LEE, Saemi,JHEONG, Weonhwa JAPANESE SOCIETY OF VETERINARY SCIENCE 2017 The Journal of veterinary medical science Vol.79 No.7
<P>Wild birds are reservoirs for <I>Chlamydia</I> spp. Of the total 225 samples from wild birds during January to September 2016 in Korea, 4 (1.8%) and 2 (0.9%) showed positive for <I>Chlamydia psittaci</I> and <I>Chlamydia gallinacea</I>, respectively. Phylogenetic analyses and comparisons of sequence identities for outer-membrane protein A (<I>omp</I>A) revealed that Korean <I>C. psittaci</I> fall into three previously known genotypes; genotype E, 1V and 6N, whereas the Korean <I>C. gallinacea</I> were classified as new variants of <I>C. gallinacea.</I> Our study demonstrates that wild birds in South Korea carry at least two <I>Chlamydia</I> species: <I>C. psittaci</I> and <I>C. gallinacea</I>, and provides new information on the epidemiology of avian chlamydiosis in wild birds.</P>